TECHNICAL FIELD
The present disclosure relates to a telescopic down-rod arrangement for a fan system. More particularly, the present invention relates to an electric actuation arrangement for actuation of the telescopic down-rod arrangement for the fan system. BACKGROUND
A ceiling-type fan system is commonly known in electrical industry, comprising of a ceiling fan. The ceiling fan is usually extended and supported from a ceiling, by use of a down-rod. In particular, the down-rod is employed to hang the ceiling fan downwards from the ceiling. For such purposes, one end of the down-rod is fixed to the ceiling with use of a ceiling mounting bracket, while other end of the down-rod is fixed to the ceiling fan with use of a fan mounting bracket. In conventional embodiments of the fan system, an overall length of the down-rod is fixed. In certain conditions, the ceiling fan of the fan system may require to be cleaned and/or serviced. In such embodiments of the fan system, it is cumbersome for a user to reach and access the ceiling fan, for cleaning and/or servicing purposes. A ladder may thus be needed to reach and access the ceiling fan, for cleaning and/or servicing purposes. Additionally, during cleaning and/or servicing, a person may accidently operate the ceiling fan, which may result in severe accidents, to a cleaning personnel or service-man.
Therefore, there exists a need of an improved down-rod with variable overall length in the fan system, which provides for a shorter overall length during operations, and a longer overall length during cleaning and/or servicing of the same. SUMMARY
The present disclosure relates to a telescopic down-rod arrangement for a fan system. The fan system includes a ceiling fan. The telescopic down-rod arrangement comprises of an arrangement of a plurality of down-rods and an

electric actuation arrangement. The plurality of down-rods are telescopically arranged with each other, such that a first end of the arrangement of the plurality of down-rods is fixed to a ceiling, and a second end of the arrangement of the plurality of down-rods is fixed to the ceiling fan. The electric actuation arrangement comprises of an electric motor, and a rope and pulley unit attached to and powered by the electric motor. One end of a rope is fixed to a pulley that is further fixed to the first end of the arrangement of the plurality of down-rods, while other end of the rope is fixed to the second end of the arrangement of the plurality of down-rods. Unwinding and winding of the rope over the pulley corresponds to a telescopic expansion and/or retraction of the plurality of down-rods, which further corresponds to lowering and/or raising of the ceiling fan relative to the ceiling. BRIEF DESCRIPTION OF DRAWINGS
The present invention, both as to its organization and manner of operation, together with further objects and advantages, may best be understood by reference to the following description, taken in connection with the accompanying drawings. These and other details of the present invention will be described in connection with the accompanying drawings, which are furnished only by way of illustration and not in limitation of the invention, and in which drawings:
Figure 1 shows a schematic of a fan system, in accordance with the concepts of the present disclosure.
Figure 2 shows an exploded view of the fan system of Figure 1, in accordance with the concepts of the present disclosure.
Figure 3 shows an isometric view of a telescopic down-rod arrangement of the fan system of Figure 1, in accordance with the concepts of the present disclosure.
Figure 4 shows an exploded view of the telescopic down-rod arrangement of Figure 3, in accordance with the concepts of the present disclosure.

Figure 5 shows a sectional view of the telescopic down-rod arrangement of Figure 3, in accordance with the concepts of the present disclosure. Figure 6 shows a schematic view of a control system of the fan system of Figure 1, in accordance with the concepts of the present disclosure. DETAILED DESCRIPTION
In the following description, for the purposes of explanation, various specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. It will be apparent, however, that embodiments of the present invention may be practiced without these specific details. Several features described hereafter can each be used independently of one another or with any combination of other features. An individual feature may not address any of the problems discussed above or might address only one of the problems discussed above. Some of the problems discussed above might not be fully addressed by any of the features described herein. Exemplified embodiments of the present invention are described below, as illustrated in various drawings in which like reference numerals refer to the same parts throughout the different drawings.
Fig. 1 shows a fan system [100], in accordance with the concepts of the present disclosure. Fig. 2 shows an exploded view of the fan system [100], in accordance with the concepts of the present disclosure. Fig. 1 and Fig 2 should be referred to in conjunction with each other, in order to clearly understand the scope of the present disclosure. The fan system [100] includes a ceiling fan [102] and a telescopic down-rod arrangement [104].
The ceiling fan [102] is a conventionally known arrangement of a plurality of blades [102a] mounted on a central structure [102b]. The ceiling fan [102] employs a fan motor [102c] connected to the central structure [102b]. The fan motor [102c] rotates the central structure [102b] to further rotate the plurality of blades [102a], to generate a flow of air. For aerodynamic purposes, the ceiling fan [102] is installed on the ceiling of a room, with use of the telescopic down-

rod arrangement [104]. The telescopic down-rod arrangement [104] includes a ceiling attachment end [104a] and a fan attachment end [104b]. A structure and arrangement of the telescopic down-rod arrangement [104] will be explained later in details. For assembly of the ceiling fan [102] and the telescopic down-rod arrangement [104], a ceiling mounting bracket [106a] is fixed in to the ceiling and a fan mounting bracket [106b] is fixed to the fan motor [102c[ of the ceiling fan [104]. Further, the ceiling attachment end [104a] of the telescopic down-rod arrangement [104] is fixed to the ceiling mounting bracket [106a] to install the telescopic down-rod arrangement [104] to the ceiling, while the fan attachment end [104b] of the telescopic down-rod arrangement [104] is fixed to the fan mounting bracket [106b] to install the ceiling fan [102] to the telescopic down-rod arrangement [104]. In addition to the aforementioned, the fan system [100] includes a top canopy [106c] to cover the ceiling mounting bracket [106a] and the ceiling attachment end [104a] of the telescopic down-rod arrangement [104], a bottom canopy [106d] to cover the fan mounting bracket [106b] and the fan attachment end [104b] of the telescopic down-rod arrangement [104], and a rod cover [106e] to cover remaining length of the telescopic down-rod arrangement [104]. A structure and arrangement of the telescopic down-rod arrangement [104] will be explained in details hereinafter.
Fig. 3 shows a schematic of a telescopic down-rod arrangement [104] of the fan system [100], in accordance with the concepts of the present disclosure. Fig. 4 shows a sectional view of the telescopic down-rod arrangement [104], in accordance with the concepts of the present disclosure. Figure 5 shows a section view of the telescopic down-rod arrangement [104], in accordance with the concepts of the present disclosure. Figures 3, 4, and 5 should be referred to in conjunction with each other, to clearly understand the scope of the present disclosure. The telescopic down-rod arrangement [104] includes an arrangement of a plurality of down-rods [108], an electric actuation arrangement [110], and a control system [112].

The arrangement of the plurality of down-rods [108] includes four down-rods namely a first down-rod [108a], a second down-rod [108b], and a third down-rod [108c], and a fourth down-rod [108d]. Although, in the preferred embodiment, the arrangement of the plurality of down-rods [108] includes four down-rods, it may be obvious to a person ordinarily skilled in the art that the arrangement of the plurality of down-rods [108] may employ any number of down-rods, including three down-rods, five down-rods, and the like. Such embodiments of either of three down-rods, five down-rods, or the like, employed by the arrangement of the plurality of down-rods [108] also lies within a scope of the present disclosure. In particular, the number of down-rods the arrangement of the plurality of down-rods [108] employed by the arrangement of the plurality of down-rods [108], does not limit the scope of the present disclosure. The arrangement of the plurality of down-rods [108] further defines a first end [108e] at a free end of the first down-rod [108a], and a second end [108f] at a free end of the fourth down-rod [108d]. In a preferred embodiment, as is shown and described herein, each of the first down-rod [108a], the second down-rod [108b], the third down-rod [108c], and the fourth down-rod [108d], includes a square cross-section. In alternate embodiments, each of the first down-rod [108a], the second down-rod [108b], the third down-rod [108c], and the fourth down-rod [108d], includes a rectangular or triangular cross-section. In another alternate embodiment, each of the first down-rod [108a], the second down-rod [108b], and the third down-rod [108c], and the fourth down-rod [108d], includes a circular cross-section. Further, in the arrangement of the plurality of down-rods [108], the second down-rod [108b] is telescopically arranged relative to the first down-rod [108a] with use of a first pair of damping bracket [114a], the third down-rod [108c] is telescopically arranged relative to the second down-rod [108b] with use of a second pair of damping bracket [114b], the fourth down-rod [108d] is telescopically arranged relative to the second down-rod [108b] with use of a third pair of damping bracket [114c]. With such assembly, the arrangement

of the plurality of down-rods [108] is capable of telescopic expansion and/or retraction between a retracted position and an expanded position. In particular, the arrangement of the plurality of down-rods [108] is capable of telescopic expansion to be adjusted to the expanded position, while the arrangement of the plurality of down-rods [108] is capable of telescopic retraction to be adjusted to the retracted position. It may be noted, in an assembly of the telescopic down-rod [104] with the ceiling fan [102], telescopic expansion of the arrangement of the plurality of down-rods [108] to the expanded position corresponds to lowering of the ceiling fan [102] relative to the ceiling. Similarly, in the assembly of the telescopic down-rod [104] with the ceiling fan [102], telescopic retraction of the arrangement of the plurality of down-rods [108] to the retracted position corresponds to raising of the ceiling fan [102] relative to the ceiling. Further, the electric actuation arrangement [110] is provided to facilitate expansion and/or retraction of the arrangement of the plurality of down-rods [108] between the expanded position and the retracted position, to further facilitate lowering and/or raising of the ceiling fan [102] relative to the ceiling between the lowered position and the raised position. The electric actuation arrangement [110] includes an electric motor [116] and a rope and pulley unit [118]. An installation of the electric motor [116] and the rope and pulley unit [118] will be explained hereinafter.
The electric motor [116] is a conventionally known type of motor, including either of an induction motor, a stepper motor, a DC motor, and/or similar motor. The electric motor [116] is installed with use of a combination of a motor mounting bracket [120a], a tube support pin [120b], and a circlip [120c]. For such purposes, the motor mounting bracket [120a] is attached to the first end [108e] of the arrangement of the plurality of down-rods [108], with use of the tube support pin [120b] and the circlip [120c]. Such installation with use of the tube support pin [120b] and the circlip [120c] substantially restricts a relative movement of the arrangement of the plurality of down-rods [108] relative to the

mounting bracket [120a], and therefore avoids vibration and noises, and enables jerk-free operation of the ceiling fan [102]. Notably, in addition to the motor mounting bracket [120a], there is also provided a switch mounting bracket [120d] attached to the first end [108e] of the arrangement of the plurality of down-rods [108], with use of another tube support pin [120b] and another circlip [120c]. The switch mounting bracket [120d] is adapted to mounting therein an auto-cut-off safety switch [136] of the control system [112] thereof, an operation of which will be explained later in details. Accordingly, the electric motor [116] is mounted on the mounting bracket [120a], to be installed thereon. The rope and pulley unit [118] is attached to and powered by the electric motor [116]. The rope and pulley unit [118] is a combination of a rope [122] and a pulley [124]. The pulley is [124] is fixedly mounted on the first end [108a] of the arrangement of the plurality of down-rods [108]. For such purposes, the pulley [124] is attached to the motor mounting bracket [120a], by passing a pulley pin [120e] through each of the motor mounting bracket [120a] and the pulley [124]. A grub screw [120f] further fixes the pulley [124] to the pulley pin [120e]. Additionally, the pulley pin [120e] is fixed to a rotor of the electric motor [116], thereby rotatably attaching the rotor of the electric motor [116] to the pulley [124] to transfer rotational motion of the rotor of the electric motor [116] to the pulley [124]. Additionally, the mounting bracket [120a] is attached to and covered by a hanging bracket [120g], with use of one or more screws [120h]. Notably, a printed circuit board [PCB} [130] of the control system [112] is installed within the hanging bracket [120g], with use of a PCB mounting plate [120i]. An operation of the printed circuit board [PCB} of the control system [112] will be explained later in details. In assembly, the second end [108f] of the arrangement of the plurality of down-rods [108] is covered by a cover panel [120j]. Notably, the ceiling attachment end [104a] of the telescopic down-rod arrangement [104] is defined at the hanging bracket [120g], while the fan attachment end [104b] of the telescopic down-rod arrangement [104] is defined

at the cover panel [120j] on the ceiling distal end of the fourth down-rod [108d]. As the ceiling attachment end [104a] of the telescopic down-rod arrangement [104] attaches to the ceiling, it may be referred to as fixed attachment of the first end [108e] of the arrangement of the plurality of down-rods [108] to the ceiling. Similarly, as the fan attachment end [104a] of the telescopic down-rod arrangement [104] attaches to the ceiling fan [102], it may be referred to as fixed attachment of the first end [108e] of the arrangement of the plurality of down-rods [108] to the ceiling fan [102]. Furthermore, one end of the rope [122] is fixed to the pulley [124] that is further fixed to the first end [108e], while other end of the rope [122] is fixed to the second end [108b] of the arrangement of the plurality of down-rods [108]. Notably, the rope [122] of the rope and pulley unit [118] of the electric actuation arrangement [110] extends through the arrangement of the plurality of down-rods [108].
With the aforementioned structure and arrangement of the telescopic down-rod arrangement [104], an operation of the electric motor [116] in a clockwise and/or anti-clockwise direction corresponds to unwinding and/or winding of the rope [122] on the pulley [124] of the rope and pulley unit [118], which further corresponds to expansion and/retraction of the telescopic down-rod arrangement [104], which further corresponds to lowering and/or raising of the ceiling fan [102] relative to the ceiling. For example, operation of the electric motor [116] in a clockwise direction corresponds to unwinding of the rope [122] on the pulley [124] of the rope and pulley unit [118], which further corresponds to expansion of the telescopic down-rod arrangement [104], which further corresponds to lowering of the ceiling fan [102] relative to the ceiling. Similarly, operation of the electric motor [116] in an anti-clockwise direction corresponds to winding of the rope [122] on the pulley [124] of the rope and pulley unit [118], which further corresponds to retraction of the telescopic down-rod arrangement [104], which further corresponds to raising of the ceiling fan [102] relative to the ceiling. An operation of the electric motor [116] of the electric actuation

arrangement [110] is controlled by the control system [112]. The control system [112] will be explained in details hereinafter.
Figure 6 shows a block diagram of the control system [112] of the telescopic down-rod arrangement [104]. The control system [112] is deployed to control operation of the electric actuation arrangement [110] of the telescopic down-rod arrangement [104]. The control system [112] includes a power supply [125], an actuation circuitry [126], a microcontroller [128], an indication unit [132], and a remote controller [134].
The power supply [125] supplies power to each of the microcontroller [128], the electric motor [116] via the actuation circuitry [126], the fan motor [102c] via the auto-cutoff safety switch [136], and the indication unit [132]. A voltage step-up or voltage step-down circuitry between the power supply [125] and various components of the control system [122] may be envisioned by a person ordinarily skilled in the art. For brevity purposes, such voltage step-up or voltage step-down circuitries are not shown and described in the present disclosure. The power supply [125] may be a three-phase alternating current (AC) power supply, a single phase alternating current (AC) power supply, a 24 Volt (24V) DC power supply, a 12 Volt (12V) DC power supply, 5 Volt (5V) DC power supply, a 3 Volt (3V) power supply, and/or a combination thereof. In one embodiment, the power supply [125] is a 230 Volt (230V) single phase alternating current (AC) power supply, provided along with one or more power converters (including a voltage step-up converter, a voltage step-up converter, a power-type converter, and/or a combination thereof), to supply appropriate power to each of the microcontroller [128], the electric motor [128] via the actuation circuitry [126], the fan motor [102c] via the auto-cutoff safety switch [136], and the indication unit [132]. For example, in such embodiment, the power supply [125] directly supplies 230V three phase alternating (AC) power to the electric motor [128] via the actuation circuitry [126], and to the fan motor [102c] via the auto-cutoff safety switch [136]. Whereas, in such embodiment, the power supply [125]

supplies 12 V direct current (DC) power supply through a power converter, to the microcontroller [128], and to the indication unit [132]. Therefore, a scope of the present disclosure remains unaffected by a type of power supply [125] been used, for supplying electric power to each of the microcontroller [128], the electric motor [128] via the actuation circuitry [126], the fan motor [102c] via the auto-cutoff safety switch [136], and the indication unit [132]. The microcontroller [128] is electrically connected to the actuation circuitry [126], such that the actuation circuitry [126] and the microcontroller [128], in conjunction, are adapted to activate and/or deactivate the electric motor [116], based on signals received from the fan motor [102c] of the ceiling fan [102]. Moreover, the microcontroller [128] is electrically connected to the actuation circuitry [126], such that the actuation circuitry [126] and the microcontroller [128], in conjunction, are adapted to control the electric motor [116] to operate in either of a clockwise direction and/or an anti-clockwise direction, based on control signals from the remote controller [134]. Moreover, the microcontroller [128] is electrically connected to the indication unit [132], to enable the indication unit [132] to indicate one of an active mode, an inactive mode, a clockwise operation mode, an anti-clockwise operation mode of the electric motor [116]. For such purposes, the microcontroller [128] is in electrical communication with the fan motor [102c] of the ceiling fan [102] and the remote controller [134], as well. Therefore, the microcontroller [128] is suitably programmed to perform the aforementioned functions of the control system [112]. The electrical connection/communication of the microcontroller [128] with each of the fan motor [102c], the remote controller [134], the actuation circuitry [126], and the indication unit [132], may be either of a wired or wireless communication. Moreover, electrical connection/communication of the microcontroller [128] with each of the fan motor [102c], the remote controller [134], the actuation circuitry [126], and the indication unit [132], may be either of a one-way communication, and/or a two-way communication. Examples of

the wireless communication may include, such as but not limited to, a Bluetooth connection, a LAN connection, a WAN connection, an NFC connection, other short-range communication, other long-range communication, and/or the like. Examples of the microcontroller [128] may include, such as but not limited to, an 8081 microcontroller, 8085 microcontroller, 4-bit 4040 microcontroller, an 8-bit 8008 microcontroller, and/or the like. A type of microcontroller does not limit a scope of the present invention.
The actuation circuitry [126] and the microcontroller [128] are fabricated on the printed circuit board (PCB) [130], and are electrically connected to each other. The actuation circuitry [126] and the microcontroller [128] are adapted to activate and/or deactivate the electric motor [116], based on signals received from the fan motor [102c] of the ceiling fan [102]. In particular, the actuation circuitry [126] is electrically connected to the electric motor [116], and is adapted to activate and/or deactivate the electric motor [116] based on instructions received from the microcontroller [128]. The microcontroller [128] is further electrically connected to and receives signals from the fan motor [102c] of the ceiling fan [102]. In particular, the microcontroller [128] receives one of: an operative fan-operation signal from the fan motor [102c] during an operative mode of operation of the fan motor [102c] of the ceiling fan [102], and an inoperative fan-operation signal from the fan motor [102c] during an inoperative mode of operation the fan motor [102c] of the ceiling fan [102]. Accordingly, the microcontroller [128] instructs the activation circuitry [126] to deactivate the electric motor [116] upon receipt of the operative fan-operation signal from the fan motor [102c] of the ceiling fan [102]. Moreover, the microcontroller [128] instructs the activation circuitry [126] to keep deactivated the electric motor [116] for a halt time period upon receipt of the inoperative fan-operation signal from the fan motor [102c] of the ceiling fan [102], and further activate the electric motor [116] upon completion of the halt time period. 'Deactivation' of the electric motor [116] corresponds to cutting off of a connection between the

power supply [125] and the electric motor [116], making the electric motor [116] inoperative. 'Activation' of the electric motor [116] corresponds to allowing the connection between the power supply [125] and the electric motor [116], making the electric motor [116] operative.
Additionally, the actuation circuitry [126] and the microcontroller [128], in combination, are adapted to control the electric motor [116] to operate in either of a clockwise direction and/or an anti-clockwise direction, based on control signals from the remote controller [134]. For such purposes, the microcontroller [128] is typically in wireless communication with the remote controller [134]. The remote controller [134] has control buttons that may be pressed by a user to send signals to the microcontroller [128]. For example, upon pressing DOWN control button thereon, the remote controller [134] sends a clockwise operation control signal to the microcontroller [128], upon receipt of which the microcontroller [128] instructs the activation circuitry [126] to operate the electric motor [116] in the clockwise direction. Similarly, upon pressing UP control button thereon, the remote controller [134] sends an anti-clockwise operation control signal to the microcontroller [128], upon receipt of which the microcontroller [128] instructs the activation circuitry [126] to operate the electric motor [116] in the anti-clockwise direction. Notably, the deactivation signal from the fan motor [102c] to the microcontroller [128] overrides each of the clockwise operation control signal and the anti-clockwise operation control signal from the remote controller to the microcontroller [128]. Although, the present disclosure describes a clockwise operation of the electric motor [116], upon pressing the DOWN control button on the microcontroller [128], and an anti-clockwise operation of the electric motor [116], upon pressing the UP control button on the microcontroller [128], it may be obvious to a person ordinarily skilled in the art that the activation circuitry [126] may be suitably configure to operate the electric motor [116] reversely, i.e. operation of an anti¬clockwise operation of the electric motor [116], upon pressing the DOWN control

button on the microcontroller [128], and an clockwise operation of the electric motor [116], upon pressing the UP control button on the microcontroller [128]. Furthermore, in one embodiment, the control buttons on the remote controller [134], including both of the UP control button and the DOWN control button, may be pressed just once for sending either of the clockwise operation control signal or the anti-clockwise operation control signal to the microcontroller [128]. In an alternate embodiment, the control buttons on the remote controller [134], including both of the UP control button and the DOWN control button, may require to be continuously pressed for sending either of the clockwise operation control signal or the anti-clockwise operation control signal to the microcontroller [128].
Furthermore, while operating the electric motor [116] in either of a clockwise direction and/or an anti-clockwise direction, the actuation circuitry [126] and the microcontroller [128], in combination, are also adapted to control a speed of operation of the electric motor [116]. For such purposes, the microcontroller [134[ is provided with a speed increase control button and a speed decrease control button. Upon pressing the speed increase control button, the microcontroller [128] sends a speed increase control signal to the microcontroller [128], upon receipt of which the microcontroller [128] instructs the activation circuitry [126] to operate the electric motor [116] at a relatively increased speed. Similarly, upon pressing the speed decrease control button, the microcontroller [128] sends a speed decrease control signal to the microcontroller [128], upon receipt of which the microcontroller [128] instructs the activation circuitry [126] to operate the electric motor [116] at a relatively increased speed. Notably, for such purposes, a level of speeds of operation of the electric motor [116] are predefined in the activation circuitry [126]. Upon pressing the speed increase control button/the speed increase control button on the remote controller [134] once, the speed of the electric motor [116] is increased and/or decreased by one level thereof.

The indication unit [132] is further provided to indicate one of an active mode, an inactive mode, a clockwise operation mode, an anti-clockwise operation mode of the electric motor [116]. Additionally, the indication unit [132] may also be indicative of an extended position and/or a retracted position of the telescopic down-rod arrangement [104]. The indication unit [132] is electrically connected to the microcontroller [128], and includes one or more of an LED, a buzzer, or a combination thereof.
Furthermore, the control system [112] also employs the auto-cutoff safety switch [136] electrically disposed between the power supply [125] and the fan motor [102c] of the ceiling fan [102]. The auto-cutoff safety switch [136] is piston-type switch suitably positioned relative to the arrangement of the plurality of down-rods [108], to operate in a first mode during a retracted position of the arrangement of the plurality of down-rods [108], and in a second mode during an extended position of the arrangement of the plurality of down-rods [108]. Furthermore, the auto-cutoff safety switch [136] being electrically connected to the fan motor [102c] of the ceiling fan [102], is adapted to deactivate the fan motor [102c] in the second mode of operation, while it activates the fan motor [102c] in the first mode of operation. 'Deactivation' of the electric motor [116] corresponds to cutting off of a connection between the power supply [125] and the fan motor [102c], making the fan motor [102c] inoperative. 'Activation' of the electric motor [116] corresponds to allowing the connection between the power supply [125] and the electric motor [116], making the fan motor [102c] operative. Thereby, avoiding chances of accidents during an attempt of unwanted activation of the ceiling fan [102]. In operation of the fan system [102], the telescopic down-rod arrangement [104] is initially adjusted in the retracted position, to enable the ceiling fan [102] to be adjusted in the raised position. In such conditions, the rope [122] of the rope and pulley unit [118] is wound on the pulley [124] of the rope and pulley unit [118] of the electric actuation arrangement [110]. Additionally, in such conditions, the

auto-cut off safety switch [136] is adjusted to the first mode. In the first mode, the auto-cut off safety switch [136] activates the fan motor [102c] of the ceiling fan [102], and thus allow a supply of power to the fan motor [102c] of the ceiling fan [102]. Accordingly, in such conditions, upon pressing of a fan switch, the fan motor [102c] may be operated to enable the ceiling fan [102] to generate a flow of air. In such conditions, the fan motor [102c] sends an operative fan-operation signal to the microcontroller [128] of the control system [112] of the telescopic down-rod arrangement [104]. Upon receipt of the operative fan-operation signal from the fan motor [102c], the microcontroller [128] instructs the activation circuitry [126] to deactivate the electric motor [116] of the electric actuation arrangement [110] of the telescopic down-rod arrangement [104]. 'Deactivation' of the electric motor [116] corresponds to cutting-off of supply of power from the power supply [125] to the electric motor [116] of the electric actuation arrangement [110]. Therefore, in such conditions, if a user operates the remote controller [134], and presses either of DOWN control buttons thereon, to send either of anti-clockwise operation control signal to the microcontroller [128], it overrides the anti-clockwise operation control signal from the remote controller [134] with the operative fan-operation signal from the fan motor [102c]. Accordingly, the microcontroller [128] keeps the electric motor [128] deactivated. Therefore, an accidental operation to expand the telescopic down-rod [104] for lowering of the ceiling fan, is avoided.
Later, the fan motor [102c] of the ceiling fan [102] is switched from operative mode to the inoperative mode, with use of the fan switch. Notably, upon such switching, the fan motor [102c] of the ceiling fan [102] is still maintained in the active mode. Furthermore, upon such switching, the fan motor [102c] of the ceiling fan [102] sends an inoperative fan-operation signal to the microcontroller [128] of the control system [112] of the telescopic down-rod arrangement [104]. Upon receipt of the inoperative fan-operation signal from the fan motor [102c], the microcontroller [128] instructs the activation circuitry [126] to keep

deactivated the electric motor [116] for a halt time period, for example for 60-90 seconds, and later the microcontroller [128] instructs the activation circuitry [126] to activate the electric motor [116] upon completion of the halt time period. 'Activation' of the electric motor [116] corresponds to allowing of supply of power from the power supply [125] to the electric motor [116] of the electric actuation arrangement [110]. Notably, the halt period (for example 60-90 seconds) allows the complete stopping of rotation of the fan blades [102b] of the ceiling fan [102], before allowing the electric motor [116] of the electric actuation arrangement [110] to be operative. Thus, it restricts an unwanted expansion of the telescopic down-rod [104] from the retracted position to the extended position, and thus restricts unwanted lowering of the telescopic down-rod [104] from the raised position to the lowered position, during inertial rotation of the fan blades [102b] of the ceiling fan [102]. This avoids chances of accidents due to inertial rotation of the fan blades [102b] of the ceiling fan [102]. Furthermore, in certain situations, for example during servicing and/or cleaning requirements, the ceiling fan [102] is required to be switched from the raised position to the lowered position. For such purposes, a user may press the DOWN button on the remote controller [134], to adjust the ceiling fan [102] from the raised position to the lowered position. Upon pressing the DOWN button, the remote controllers [134] sends an anti-clockwise operation control signal to the microcontroller [128], to instruct the activation circuitry [126] to operate the electric motor [116] in the anti-clockwise direction. Upon such operation of the electric motor [116] in the anti-clockwise direction, the rope [122] unwinds from the pulley [124] of the rope and pulley unit [118] of the electric actuation arrangement [110], which corresponds to extension of the arrangement of the plurality of down-rods [108] from the retracted position to the extended position, which further corresponds to lowering of the ceiling fan [102] from the raised position to the lowered position. In this position, the ceiling fan [102] can be serviced and/or cleaned. While performing such extension of the

arrangement of the plurality of down-rods [108] from the retracted position to the extended position, a speed increase control button and/or a speed decrease control button on the microcontroller [134] may be pressed, to increase and/or decrease the speed of the electric motor [116], and correspondingly increase/decrease a speed of extending the arrangement of the plurality of down-rods [108]. Due to extension of the arrangement of the plurality of down-rods [108] from the retracted position to the extended position, the auto-cut off safety switch [136] is switched from the first mode to the second mode. In the second mode, the auto-cut off safety switch [136] deactivates the fan motor [102c] of the ceiling fan [102]. Deactivation of the fan motor [102c] of the ceiling fan [102] corresponds to cutting-off of supply of power form the power source [125] to the fan motor [102c] of the ceiling fan [102]. Accordingly, an operation of the ceiling fan [102] is restricted, while the ceiling fan [102] is adjusted to the lowered position.
Thereafter, upon completion of cleaning and/or servicing, the ceiling fan [102] is required to be switched from the lowered position to the raised position. For such purposes, a user may press the UP button on the remote controller [134], to adjust the ceiling fan [102] from the lowered position to the raised position. Upon pressing the UP button, the remote controllers [134] sends a clockwise operation control signal to the microcontroller [128], to instruct the activation circuitry [126] to operate the electric motor [116] in the clockwise direction. Upon such operation of the electric motor [116] in the clockwise direction, the rope [122] is wound over the pulley [124] of the rope and pulley unit [118] of the electric actuation arrangement [110], which corresponds to retraction of the arrangement of the plurality of down-rods [108] from the extended position to the retracted position, which further corresponds to raising of the ceiling fan [102] from the lowered position to the raised position. While performing such retraction of the arrangement of the plurality of down-rods [108] from the extended position to the retracted position, a speed increase control button

and/or a speed decrease control button on the microcontroller [134] may be
pressed, to increase and/or decrease the speed of the electric motor [116], and
correspondingly increase and/or decrease a speed of retraction of the
arrangement of the plurality of down-rods [108]. Due to retraction of the
arrangement of the plurality of down-rods [108] from an extended position to a
retracted position, the auto-cut off safety switch [136] is switched from the
second mode to the first mode. In the first mode, the auto-cut off safety switch
[136] activates the fan motor [102c] of the ceiling fan [102]. Activation of the fan
motor [102c] of the ceiling fan [102] allows the supply of power form the power
source [125] to the fan motor [102c] of the ceiling fan [102]. Accordingly, an
operation of the ceiling fan [102] is allowed, while the ceiling fan [102] is
adjusted to the raised position.
While the preferred embodiments of the present invention have been described
hereinabove, it should be understood that various changes, adaptations, and
modifications may be made therein without departing from the spirit of the
invention and the scope of the appended claims. It will be obvious to a person
skilled in the art that the present invention may be embodied in other specific
forms without departing from its spirit or essential characteristics. The described
embodiments are to be considered in all respects only as illustrative and not
restrictive.
List of Components:
100-Fan System
102-Ceiling Fan
102a - Blades of 102
102b - Central Structure of 102
102c-Fan Motor
104 - Telescopic down-rod arrangement
104a - First End of 104
104b - Second End of 104

106a - Ceiling Mounting Bracket
106b - Fan Mounting Bracket
106c -Top Canopy
106d - Bottom Canopy
106e - Rod Cover
108 - Arrangement of plurality of down-rods
108a, 108b, 108c, and 108d - First, Second, Third, and Fourth Down-rod
110 - Electric Actuation Arrangement
112 - Control System
114a, 114b, 114c - Damping Brackets
116-Electric Motor
118 - Rope and Pulley Unit
120 - Motor Mounting Bracket
120b-Tube Support Pin
120c - Circlip
120d - Switch Mounting Bracket
120e- Pulley Pin
120f-Grub Screw
120g - Hanging Bracket
120h -Screws
120i - PCB mounting plate
122-Rope of 118
124-Pulley of 118
125 - Power Supply
126 - Actuation Circuitry 128-Microcontroller 130 - Printed Circuit Board 132- Indication Unit
134 - Remote Controller

136 - Auto-Cut off safety switch

I/We Claim:
1. A telescopic down-rod arrangement [104] for a fan system [100], the fan
system [100] including a ceiling fan [102], the telescopic down-rod
arrangement [104] comprising:
an arrangement of a plurality of down-rods [108] telescopically arranged with each other, a first end [104a] of the arrangement of the plurality of down-rods [108] is fixed to a ceiling, while a second end [104b] of the arrangement of the plurality of down-rods [104b] is fixed to the ceiling fan [102];
an electric actuation arrangement [110] comprising of an electric motor [116], and a rope and pulley unit [118] attached to and powered by the electric motor [116], wherein
one end of a rope [122] is fixed to a pulley [124] that is further fixed to the first end [104a] of the arrangement of the plurality of down-rods [108], while other end of the rope [122] is fixed to the second end [104b] of the arrangement of the plurality of down-rods [108], wherein
unwinding and winding of the rope [122] over the pulley [124] corresponds to a telescopic expansion and/or retraction of the arrangement of the plurality of down-rods [108], which further corresponds to lowering and/or raising of the ceiling fan [102] relative to the ceiling.
2. The telescopic down-rod arrangement [104] as claimed in claim 1, wherein each of the plurality of down-rods [108a, 108b, 108c] has either of a square, rectangular, and triangular cross-section.
3. The telescopic down-rod arrangement [104] as claimed in claim 1, wherein an operation of the electric motor [116] in one of an anti¬clockwise direction and a clockwise direction corresponds to unwinding and/or winding of the rope [122] over the pulley [124] of the rope and

pulley unit [118].
4. The telescopic down-rod arrangement [104] as claimed in claim 1, further includes a control system [112] for controlling the electric motor [116], to further control the rope and pulley unit [118].
5. The telescopic down-rod arrangement [104] as claimed in claim 4, wherein the control system [112] includes:
an activation circuitry [126] electrically connected to the electric motor; and
a microcontroller [128] electrically connected to the activation circuitry [126], such that the microcontroller [128] selectively instructs the actuation circuitry [126] for either of operation of the electric motor [116] to rotate in a clockwise direction, operation of the electric motor [116] in an anti-clockwise direction.
6. The telescopic down-rod arrangement [104] as claimed in claim 5, wherein the activation circuitry [126] and the microcontroller [128], are fabricated on a printed circuit board (PCB) [130].
7. The telescopic down-rod arrangement [104] as claimed in claim 5, wherein the control system [112] further includes a remote controller [134] that sends one of: a clockwise operation control signal to the microcontroller [128] to instruct the activation circuitry [126] to operate the electric motor [116] in a clock-wise direction, an anti-clockwise operation control signal to the microcontroller [128] to instruct the activation circuitry [126] to operate the electric motor [116] in the anti¬clockwise direction.
8. The telescopic down-rod arrangement [104] as claimed in claim 5, wherein the microcontroller [128] is electrically connected to a fan motor [102c] of the ceiling fan [102], to receive one of an operative fan-operation signal during an operative mode of operation of the fan motor [102c] of the ceiling fan [102], and an inoperative fan-operation signal

during inoperative mode of operation the fan motor [102c] of the ceiling fan [102].
9. The telescopic down-rod arrangement [104] as claimed in claim 8, wherein the microcontroller [128] instructs the activation circuitry [126] to deactivate the electric motor [116] upon receipt of the operative fan-operation signal from the fan motor [102c] of the ceiling fan [102].
10. The telescopic down-rod arrangement [104] as claimed in claim 8, wherein the microcontroller [128] instructs the activation circuitry [126] to keep deactivated the electric motor [116] for a halt time period upon receipt of the inoperative fan-operation signal from the fan motor [102c] of the ceiling fan [102], and further activates the electric motor [116] upon completion of the halt time period.
11. The telescopic down-rod arrangement [104] as claimed in claim 10, wherein activation of the electric motor [116] corresponds to supply of electric power thereto, while deactivation of the electric motor [116] corresponds to disconnection of the supply of electric power thereto.
12. The telescopic down-rod arrangement [104] as claimed in claims 4-11, wherein the deactivation signal from the fan motor [102c] to the microcontroller [128] overrides each of the clockwise operation control signal and the anti-clockwise operation control signal from the remote controller to the microcontroller [128].
13. The telescopic down-rod arrangement [104] as claimed in claim 5, wherein the control system [112] includes an auto-cut off safety switch [136] positioned to operate in a first mode during a retracted position of the arrangement of the plurality of down-rods [108], and in a second mode during an extended position of the arrangement of the plurality of down-rods [108].
14. The telescopic down-rod arrangement [104] as claimed in claim 13, wherein auto-cut off safety switch [136] is electrically connected to the

fan motor [102c] of the ceiling fan [102], such that the auto-cut off safety switch [136] deactivates the fan motor [102c] in the second mode of operation, while the auto-cut off safety switch [136] activates the fan motor [102c] in the first mode of operation.
15. The telescopic down-rod arrangement [104] as claimed in claim 5, wherein the control system [112] includes an indication unit [132] comprising of an LED and a buzzer, to indicate one or more of the extended position and the retracted position of the arrangement of the plurality of down-rods.
16. The telescopic down-rod arrangement [104] as claimed in claim 7, wherein the remote controller [134] sends one of: a speed-increase operation control signal to the microcontroller [128] to instruct the activation circuitry [126] to operate the electric motor [116] with relatively increased speed, a speed-decrease control signal to the microcontroller [128] to instruct the activation circuitry [126] to operate the electric motor [116] with relatively decreased speed.