FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION A TELESCOPIC TABLE LAMP
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Katti Sudarshan of Crompton Greaves Ltd, Industrial Design Centre, Global R&D Centre, Crompton Greaves Ltd., Kanjurmarg (East), Mumbai-400 042, Maharashtra, India, an Indian National.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed.

FIELD OF THE INVENTION:
This invention relates to the field of telescopic mechanical assemblies and fighting fixtures.
Particularly, this invention envisages a telescopic table lamp.
BACKGROUND OF THE INVENTION:
Use of tables and table lamps for different kinds of work has necessitated the development of task lights defined for use according to specific requirements. One type of task light may be embedded onto a wall overlooking the table. Another type of desk lamp is one with retractable arms or bendable arms in order to define the scope of light on to a segment or portion of the table or work space. Most of such lighting fixtures are mounted on to the table, thus rendering a specific portion of the table useless for use.
The work space, apart from getting reduced, also includes hindrances due to the mounting of such lamps.
PRIOR ART:
CN101509643 discloses a ceiling mounted spotlight, not suitable mounting on a work-desk. In this, the light source retracts into a luminaire, but is not held by any unit. The lighting fixture (luminaire) is not concealed.

CN2299985 discloses a road lamp. The telescopic nature of the pole hoisting the lamp is for purposes of maintenance, and complete concealing is not an option. Also, the lamp extends out of the perimeters of the poles, thus rendering its concealability void,
CN201326945 discloses a household table lamp. It discloses a lamp with a lamp fixture such that the lamp, the lamp post, lamp base can be concealed within a lamp holder. This mechanism is cumbersome for use on a workspace, in that, the area where the light needs to be targeted cannot be adjusted.
CN201202986 discloses a lamp wherein the lamp first inside the perimeter of a housing which in turn is telescopically slidably engaged to fit into another housing. However, mounting it on a workbench or a worksurface is not a feasible option, as it will interrupt with the work surface area in its non-operative configuration.
CN201288940 discloses a telescopic lamp fixation structure. Rotation is prevented in this assembly. Also, complete concealment is not provided.
CN201043706 discloses a lamp consisting of a light blocking head, a light blocking plate, an installation lamp head and a base and is characterized in that a clamping component is arranged among the light blocking head, the light blocking plate, the installation lamp head and the base and then all of the components are integrated into a whole through the clamping component. Compact concealable, and rotatable nature of the lamp are not disclosed.

CA201639 discloses an inner pipe and outer pipe which are telescopically engaged. The outer pipe holds the lamp. Rotations are not defined.
US5265000 discloses a desk lamp which telescopically pulls out of a lighting fixture. The lamp does not provide a great degree of freedom and is lithus limited in its scope of targeting an area. Concealing ability is not achieved thoroughly.
US4034214 discloses a floor lamp. The feature of complete concealing is not available with such type of a fixture. Although the cited document provides vertical adjustment it does not seem to provide an effective locking system to arrest the smaller tubular member at a height as required by the user, the current invention provides an ergonomic position of light source, which does not cause glare.
JP2002100235 discloses a lighting fixture which houses the lamp holding assembly, and the assembly telescopically moves out of the lighting fixture. However, the compactness is not achieved by the provisioning of the light in between two parallel holding assemblies.
JP2004232372 discloses a light which may be embedded at the top of the telescoping assemblies. Complete concealment is not achieved. This is because the light is not housed within the telescopic arrangements.
CN1995805 discloses a lamp is disclosed wherein the lamp first inside the perimeter of housing which in turn is telescopically slidably engaged to fit

into another housing. Howver, mounting it on a workbench or a works urface is not a feasible option, as it will interrupt with the work surface are in its non-operative configuration.
US2007223214 discloses an LED lamp assembly within a pen, with the mechanism of telescopically engagement,
US5065299 discloses a lamp which fits insixde a luminaire. The lamp extends out of the luminaire by means of telescopic arms. The method of extension is a complex mechanism of drives and electrical conductors and hence, renders it susceptible to more wear and tear.
There is a need for a table lamp to obviate the problems of the prior art.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a table lamp which leaves the table clutter free in its inoperative configuration.
Another object of the invention is to provide a table lamp with minimal electrical connections on to the table upon which it is fixed in its operative or inoperative configuration.
Yet another object of the invention is to provide a task-specific table lamp adapted to target its light on to a specific portion of the table upon which it is mounted.

Still another object of the invention is to provide a cheap and energy efficient table lamp.
An additional object of the invention is, to provide a table lamp which occupies relatively less space in its operative configuration.
Yet an additional object of the invention is to provide an adjustable light source of a table lamp with respect to its height.
Still an additional object of the invention is to provide an adjustable light source of a table lamp with respect to its scope of light emission.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a telescopic table lamp adapted to be mounted from a table, said telescopic table lamp comprises:
a. first cylinder adapted to be hanging beneath said table through an
opening in said table;
b. second cylinder adapted to be telescopically engaged with said first
cylinder;
c. engaging and disengaging means adapted to engage said second
cylinder to telescope out of said first cylinder in order to protrude out
of said table in accordance with an operative configuration and further
adapted to disengage second cylinder to telescope into said first
cylinder in accordance with an inoperative configuration;
d. actuation means adapted to actuate said engaging and disengaging
means: and

e. first light fixture adapted to be ensconced within said second cylinder for emitting light out of a radial segment of said second cylinder in its operative configuration.
Typically, said first cylinder includes collar means adapted to be placed over said table in order to provide support for hanging said first cylinder beneath said table.
Alternatively, said first cylinder means includes fixing means adapted to fix said fist cylinder from beneath said table.
Typically, first light fixture includes a slanting plate containing embedded LEDs for light emission.
Typically, said lamp includes sensor means adapted to sense position of engaging and disengaging means in order to determine height of said second cylinder out of said first cylinder.
Alternatively, said lamp includes multiple sensor means adapted to sense multiple pre-defined positions of engaging and disengaging means.
Typically, said lamp includes a main power supply adapted to connect to light fixture through said first cylinder.
Typically, said lamp includes an auxiliary power means adapted to be fitted within said first cylinder for providing auxiliary power supply to light fixture through said first cylinder.

Additionally, said lamp includes a second light fixture adapted to be ensconced within said first cylinder.
Still additionally, said lamp includes angular displacement means adapted to angularly displace said second cylinder with respect to said first cylinder in its operative telescopically engaged position.
BRIEF DESCRIPTION OF 1 HE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a schematic cross-sectional view of the telescopic table lamp;
Figure 2 illustrates a schematic view of the telescopic table lamp in its operative configuration; and
Figure 3 illustrates a schematic view of the telescopic table lamp in its inoperative configuration.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:

According to this invention, there is provided a telescopic table lamp (100) adapted to be mounted on a table within a defined circular holding in said table.
Figure 1 illustrates a schematic cross-sectional view of the telescopic table lamp in accordance with this invention.
Figure 2 illustrates a schematic view of the telescopic table lamp, in accordance with this invention, in its operative configuration.
Figure 3 illustrates a schematic view of the telescopic table lamp, in accordance with this invention, in its inoperative configuration.
In accordance with an embodiment of this invention, there is provided a first cylinder (110) adapted to be mounted on to a circular cutting in said table (115) by means of collars (120) fitted on to said first cylinder. Typically, the entire body of said first cylinder extends below said table, by deriving support by means of said collars resting on said table. The circular cutting is typically a hole made for cable manager means or the like. The collars may placed above said table, or even be replaced by an alternative suitable fixing means adapted to fix said first cylinder from underneath said table.
In accordance with another embodiment of this invention, there is provided a second cylinder (130) adapted to be telescopically engaged with said first cylinder. Said telescopically engaged second cylinder is adapted to telescope out of said first cylinder upon actuation. In its operative configuration, said second cylinder telescopes out of said first cylinder, in that, said second

cylinder protrudes out of said table. It its inoperative configuration, said second cylinder retracts into said first cylinder and thus below said table.
In accordance with yet another embodiment of this invention, there is provided an engaging and disengaging means (140A, 140B) adapted to engage said second cylinder to telescope out of said first cylinder in order to protrude out of said table in accordance with said operative configuration and further adapted to disengage second cylinder to telescope into said first cylinder in accordance with said inoperative configuration. Reference numeral 140A refers to lead screw. Reference numeral 140B refers to screw bush. Reference numeral 140C refers to motor which drives said lead screw into said screw bush or for removing said lead screw from said screw bush.
Typically, said engaging and disengaging means is a screw adapted to be fitted into a threaded bushing, wherein said threaded bushing is co-axially located within said second cylinder through its operative bottom side. The screw aids in jutting out the threaded busing which wraps it, thus jutting out said second cylinder out of said first cylinder.
In accordance with still another embodiment of this invention, there is provided an actuation means (150) adapted to actuate said engaging and disengaging means. Typical!)', said actuation means is a push button or a remotely located button to telescope said second cylinder out of said first cylinder or to telescope said second cylinder into said first cylinder.
In accordance with an additional embodiment of this invention, there is provided a first light fixture (160A, 160B) adapted to be ensconced whithin

said second cylinder. The ensconced light fixture is typically an array of LEDs mounted on a slanting plate, adapted to emit light onto a portion of the table, thus illuminating it. Reference numeral 160A refers to LED plate. Reference numeral 160B refers to glass.
Typically, said LEDs are adapted to be activated only when said second cylinder telescopes out of said first cylinder.
In accordance with ye! an additional embodiment of this invention, there is provided a sensor means (170) adapted to sense position of said second cylinder with respect to said first cylinder in accordance with pre-defined sensor parameters. Upon successful sensing, the telescopic engagement stops, thus determining the height of the second cylinder out of the first cylinder. Various positions of the second cylinder telescoped out of the first cylinder with respect to the jutting out can be obtained by having a plurality of sensing means, and thereby calibrating the function of engaging and disengaging means accordingly lo lock at pre-defined levels.
In accordance with still an additional embodiment of this invention, there is provided an angular displacement means (180) adapted to angularly displace said second cylinder with respect to said first cylinder in its operative telescopically engaged position. This angular displacement means may be a teethed sleeve and teeth located external to the lower edge of said second cylinder and internal to the upper edge of said first cylinder.

In accordance with yet another embodiment of this invention, there is provided a main power supply (190) adapted to connect to light fixture through said first cylinder.
In accordance with still another embodiment of this invention, there is provided an auxiliary power means (200) adapted to be fitted within said first cylinder for providing auxiliary power supply to said LEDs.
In accordance with yet an additional embodiment of this invention, there is provided a second light fixture (210) adapted to be ensconced within said first cylinder for providing light beneath said table or underneath from said table.
According to an exemplary embodiment of this invention, the telescopic table lamp illuminates the work area by means of bright 1W LEDs with life of 50,000 burning hours. It does not require pulling of light head containing the light source, since the device of this invention is provided with a switch and at the press of a button the light source slides out and throws the light. Typically, light output is sufficient to illuminate work area of about 1.5x1.5 feet. Apart from main supply, the current device using LEDs is powered by 4 rechargeable pencil cells, so when there is a power cut the user can still use the light up to about 3 hours. The light output from the task light falls directly on the work area and does not cause glare to the user's eyes as opposed to the prior art wherein the light falls on the eyes of the user and it disturbs the eyes. When light is not in use (i.e. in day light) in collapsed position, the lamps are concealed and is in flush with the work table so that

more free space is available for use. Also, the current invention is fixed to the work table hence is very stable.

We claim:
1. A telescopic tablc lamp adapted to be mounted from a table, said telescopic
table lamp comprising:
a. first cylinder adapted to be banging beneath said table through an
opening in said table;
b. second cylinder adapted to be telescopically engaged with said first
cylinder;
c. engaging and disengaging means adapted to engage said second cylinder
to telescope out of said first cylinder in order to protrude out of said table
in accordance with an operative configuration and further adapted to
disengage second cylinder to telescope into said first cylinder in
accordance with an inoperative configuration;
d. actuation means adapted to actuate said engaging and disengaging
means: and
e. first light fixture adapted to be ensconced within said second cylinder for
emitting light out of a radial segment of said second cylinder in its
operati ve configuration.
2. A system as-claimed in claim 1 wherein, said first cylinder includes collar
means adapted io be placed over said table in order to provide support for
hanging said first cylinder beneath said table.
3. A system as claimed in claim I wherein, said first cylinder means includes fixing means adapted to fix said first cylinder from beneath said table.
4. A system as claimed in claim 1 wherein, first light fixture includes a slanting plate containing embedded LEDs for light emission.
5. A system as claimed in claim 1 wherein, said lamp includes sensor means adapted to sense position of engaging and disengaging means in order to determine height of said second, cylinder out of said first cylinder.
6. A system as claimed in claim 1 wherein, said lamp includes multiple sensor means adapted to sense multiple pre-defined positions of engaging and
disengaging means.
7. A system as clamed in claim 1 wherein, said lamp includes a main power
supply adapted to connect to light fixture through said first cylinder.

8. A system as claimed in claim 1 wherein, said lamp includes an auxiliary power means adapted to be fitted within said first cylinder for providing auxiliary power supply to light fixture through said first cylinder.
9. A system as claimed in claim 1 wherein, said lamp includes a second light fixture adapted to be ensconced within said first cylinder.
10.A system as claimed in claim 1 wherein, said lamp includes angular displacement means adapted to angularly displace said second cylinder with respect to said first cylinder in its operative telescopically engaged position.