FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
"TURN INDICATOR SWITCH"
MINDA INDUSTRIES LIMITED of Village Nawada Fatehpur, P.O. Sikanderpur Badda, Distt. Gurgaon, Haryana -122004
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF THE INVENTION
The present invention relates to control switches for automotive vehicles including two wheelers and three-wheelers. In particular, the invention relates to a turn indicator (blinker switch) with improved construction to enhance the reliability of the switch.
BACKGROUND OF THE INVENTION
Generally, vehicles are provided with various control switches for safe driving of the rider as well as to the other riders. One such important control switch is a turn indicator switch (interchangeably referred to as blinker switch) that signals the other riders of the direction in which the vehicle will be moving. The activation of the turn signal is generally by hand movement of a turn indicator stalk button, switch, or the like. For example, on automotive vehicles, the turn signal indicator is typically a turn signal stalk that is located on the left side of a handle bar of the vehicle, movement of which generally corresponds to the intended direction of vehicle. If the turn indicator switch fails to work, then accidents may happen. Especially when the switch fails to work at night, the lamps fail to indicate the direction in which the vehicle will be moving and therefore, accidents may happen.
Figure 1 illustrates a conventional blinker switch assembly of two/three wheeled vehicles.
The blinker switch assembly is mounted on the handle bar of a two wheeled or three wheeled vehicle. In particular, the switch assembly is mounted on the control switch housing case located on the vehicle handle bar.
Figure 2 illustrates an exploded view of the components present in a conventional blinker switch assembly.
Typical blinker switch assembly includes a bracket (1) that encases a carrier (2) for supporting a moving contact (3). In addition to the moving contact (3), the carrier (2) also encases a spring (4) and a steel ball (5) such that the whole carrier casing moves together when operated. Further, a base (6) with one or more fixed contacts (7) mounted on the base (6) is disposed into the bracket (1) at a fixed location with respect to the moving contact (3). A lever assembly comprising a lever support (8) is locatable inside the bracket (1) and is being mounted

with an operating lever (9) which traverses outside the bracket (1). The switch assembly further comprises a cover (10) mounted at least partly to cover the lever assembly.
The lever support (8) houses a spring loaded ball or a plunger that acts as a follower. The follower moves over a profile of a CAM plate (11). The CAM plate (11) is made of steel and is sandwiched between the bracket (1) and the cover (10). A spring (12) and a steel ball (13) together referred to as cam follower is housed inside the lever support (8). The lever support (8) and the lever (9) together forming the lever assembly is operated by a knob (14) located outside the bracket. The knob is fixed to the lever (9) by means of a spring washer (15) and a screw (16) (not shown in Fig.2).
Further, the cover (10) and the cam plate (11) are provided with one or more holes or recesses for allowing self tapping screws (17) to pass through. The self tapping screws (17) are used to tightly fit the cover (10), the cam plate (11), and the bracket (1) together into a single element. In addition, a flange headed self tapping screw made of steel is used to tightly fit the lever assembly to the bracket (1). The flange headed screw allows inward/outward movement of the lever assembly, however, prohibits the upward or downward movement of the lever assembly.
The conventional blinker switch is constructed such that the moving contact and fixed contact are directly exposed to dust and water entering into the switch. Due to accumulation of dust, water and other contaminations on the contacts, an oxide or insulating layer is formed over the contacts. The presence of such layer diminishes the conduction between the contacts thereby, causing malfunctioning of the switch. Further, dust particles such as mud deposited on the contacts blocks the clearance made between the contacts and obstruct the free movement of the said contacts. Therefore, the reliability of the switch decreases and frequent replacement of the switch takes place.
Thus, there is a need to construct a blinker switch that overcomes the afore said problems.
OBJECT OF THE INVENTION
The primary object of the present invention is to provide a motor vehicle turn indicator switch of simple, durable and inexpensive construction.

The main object of the present invention is to construct a blinker switch assembly that protects the moving and fixed contacts from dust, water and also prevents formation of oxide layer and deposition of contaminating particles.
Another object of the present invention is to avoid metal friction by constructing the switch with an integrally molded CAM plate.
Yet another object of the present invention is to avoid friction by sandwiching the lever assembly between the bracket and cover, eliminating the use of the flange headed self tapping screw.
Another object of the present invention is to construct the blinker switch assembly with reduced number of parts, small in size, low cost thereby enhancing the reliability of the switch.
Yet another object of the present invention is to construct the blinker switch assembly which can be operated smoothly with one or more guiding components installed within the assembly to assist in the construction of the same.
SUMMARY OF THE INVENTION
Accordingly the present invention relates to a blinker switch assembly mounted on the handle bar of at least two wheeled vehicles, said switch assembly comprising: a bracket; a lever assembly comprising a lever support locatable inside the bracket and being mounted with an operating lever which traverses outside the bracket; a cover for at least partly covering the said lever assembly located inside the bracket; wherein the said lever support is provided with a pivot element and each of the bracket and the cover is provided with a guide for receiving the said pivot element.
In one embodiment of the present invention, the said bracket is integrally molded with a cam plate which co-operates with the lever assembly for switch operation.
In another embodiment of the present invention, said bracket is provided with guiding slots on the inner surface for holding a cam plate.
In one embodiment of the present invention, a cam follower comprising a spring loaded with a steel ball is disposed onto the said cam plate.

In one embodiment of the present invention, a carrier housing disposed at one end of the said bracket, said housing comprising a moving contact, a spring and a steel ball mounted inside the said housing.
In one embodiment of the present invention, a base comprising at least one fixed contact is mounted at a predetermined distance relative to the said moving contact.
In one embodiment of the present invention, said lever and said lever support are pivoted together at a predetermined distance.
In one embodiment of the present invention, a knob fastened to the said lever such that the said knob moves radially when the lever is operated.
In another embodiment of the present invention, said knob, lever, lever support and cam follower referred together as a knob sub-assembly is pressed in either left or right direction such that the carrier housing moves in an opposite direction.
In one embodiment of the present invention, said integrally molded cam plate is a V-shaped cam plate.
In another embodiment, the said cover is provided with an extension wall, disposed inside the switch assembly, adjacent to a slit through which the said lever traverses outward the said bracket.
Accordingly the present invention relates to a blinker switch assembly mounted on the handle bar of at least two wheeled vehicles, said switch assembly comprising: a bracket; a lever assembly comprising a lever support locatable inside the bracket and being mounted with an operating lever which traverses outside the bracket; a cover for at least partly covering the said lever assembly located inside the bracket; wherein said bracket is integrally molded with a cam plate which co-operates with the lever assembly for switch operation.
Accordingly the present invention relates to a blinker switch assembly mounted on the handle bar of at least two wheeled vehicles, said switch assembly comprising: a bracket; a lever assembly comprising a lever support locatable inside the bracket and being mounted with an operating lever which traverses outside the bracket; a cover for at least partly covering the said

lever assembly located inside the bracket; wherein said bracket is provided with guiding slots on the inner surface for holding a cam plate
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention are set forth with particularity in the appended claims. The invention itself, together with further features and attended advantages, will become apparent from consideration of the following detailed description, taken in conjunction with the accompanying drawings. One or more embodiments of the present invention are now described, by way of example only, with reference to the accompanied drawings wherein like reference numerals represent like elements and in which:
Figure 1 illustrates a perspective view of a conventional blinker switch assembly. Figure 2 illustrates an exploded view of the conventional blinker switch assembly.
Figure 3 illustrates an exemplary view of blinker switch assembly in accordance with an embodiment of the present invention,
Figure 4 illustrates a sectional view of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 5 illustrates an exploded view of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 6 illustrates exemplary views of a cover of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 7 illustrates an exemplary view of the blinker switch assembly in accordance with another embodiment of the present invention,
Figure 8 illustrates an exploded view of the blinker switch assembly in accordance with another embodiment of the present invention,
Figure 9 illustrates an exemplary view of a cam plate of the blinker switch assembly in accordance with an embodiment of the present invention.

Figures 10A and 10B illustrate perspective views of a bracket of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 11 illustrates an exemplary view of a bracket of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 12 illustrates a perspective view of a lever of the blinker switch assembly in accordance with an embodiment of the present invention.
Figures 13A and 13B illustrate exemplary views indicating knob arrangement of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 14 illustrates an exemplary view of a bracket of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 15 illustrates an exemplary view of a moving contact of the blinker switch assembly in accordance with an embodiment of the present invention.
Figure 16 illustrates an exemplary front view of a base of the blinker switch assembly in accordance with an embodiment of the present invention.
Figures 17, 17A and 17B illustrate exemplary rear views of a base of the blinker switch assembly in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE DRAWINGS
The present invention relates to a blinker switch assembly mounted on a handle bar switch assembly of two or three wheeled vehicles.
Figure 3 illustrates an exemplary view of blinker switch assembly in accordance with an embodiment of the present invention. Figure 4 illustrates a sectional view of the blinker switch assembly in accordance with an embodiment of the present invention.
The blinker switch assembly provides an input signal to an electromechanical relay circuit in response to the operation of knob. The relay circuit enables the left or right blinker to emit light (i.e., ON condition) depending on the direction in which the knob is actuated by the rider. When the knob is pressed in either left or right direction, the moving contact housed inside

the carrier overlaps with the fixed contacts, thereby making contact and causing conduction between the contacts. In order to break the contact and to set the left and right blinkers at OFF condition, the knob is pushed linearly to a specified distance to return to a neutral position where the moving contact does not overlap on any of the fixed contacts.
Figure 5 illustrates an exploded view of the blinker switch assembly in accordance with an embodiment of the present invention.
In an embodiment of the present invention, the blinker switch assembly comprises a bracket (1) housing a carrier (2), the said bracket (1) is preferably made of plastic material. The carrier (2) encases a moving contact (3), the said moving contact (3) is mounted inside the carrier (2) at a certain pressure achieved through a spring (4). A steel ball (5) is disposed behind the spring such that the carrier (2) generates audible sound feedback when the carrier casing moves together from one position to another position. Further, a base (6) is disposed inside the bracket (1) at a fixed location with respect to the moving contact (3). The base (6) is mounted with one or more rivets which is also referred to as fixed contact (7) that makes/breaks contact with the moving contact (3).
A lever assembly comprising a lever support (8) is locatable inside the bracket (1) and is mounted with an operating lever (9) which traverses outside the bracket (1). The lever (9) and the lever support (8) are pivoted at a pre-determined distance relative to the moving contact (3). The lever support (8) is provided with a pivot element and the bracket (1) is provided with a guide for receiving the said pivot element. The lever support (8) is preferably made of plastic material. The lever assembly is at least partly protected by a cover (10) such that the lever assembly is sandwiched between the bracket (1) and the cover (10). The cover (10) is fitted to the bracket (1) by means of any fitting mechanism such as snap fitting. Further, the cover (10) is also provided with a guide for receiving the pivot element and is provided with one or more holes to drain water and dust entering into the switch assembly.
In the lever assembly, the lever support (8) is provided with a recess to receive a spring loaded ball or a plunger that acts as a follower. The follower moves over a profile of a CAM plate and hence referred to as cam follower. The CAM plate, preferably made of plastic material, is integrally molded with the bracket (1). A spring (11) and a steel ball (12) together referred to as a cam follower is housed inside the recess provided in the lever support (8). The lever support

(8) and the Jever (9) forming the lever assembly is operated by a knob (13) located outside the bracket (1). The knob (13) is fixed to the lever (9) by means of a spring washer (14) (not shown in Fig.5) and a screw (15).
The knob (13), the lever (9), the lever support (8), the spring (11), and the steel ball (12) referred to as knob sub-assembly is said to be at ON position, when the knob sub-assembly is pressed in either left or right direction. When the knob sub-assembly is pressed radially either to the left or to the right direction, the carrier (2) moves in the opposite direction and overlaps the moving contact (3) over the fixed contacts (7). The moving contact (3), thus makes contact with the fixed contacts (7) causing the flow of conduction current between the moving and fixed contacts. The conduction current is supplied as a trigger signal to the electromechanical relay circuit which enables either of left or right blinkers to emit light based on the direction in which the knob sub-assembly is pressed. In order to stop the flow of current and to break the contact, the knob sub-assembly is pressed linearly so as to bring the carrier (2) to rest at a center position. The carrier (2) is brought to the center position by means of the CAM plate and the cam follower action. When the knob sub-assembly is at the center position, the moving contact (3) in the carrier (2) does not overlap with any of the fixed contacts, thus indicating that the blinker switch is at OFF condition.
The blinker switch assembly of the present invention is constructed with an integrated CAM plate molded with the bracket (1), said CAM plate is preferably made of plastic material. The plastic CAM plate avoids the metal to metal friction caused by the entry of water and dust particles entering into the switch assembly, thus reducing the formation of corrosive environment inside the switch assembly. Further, the cover (10) is fitted to the bracket (1) without using any fastening means such as steel screws. Instead, the cover (10) is designed to be fitted to the bracket (1) using a snap fitting mechanism that requires no fastening means, thereby avoiding metal friction caused by contact of water or dust particles. Also, the cover (10) fitted to the bracket (1) prevents the upward or downward movement of the lever assembly. In addition, the cover (10) is provided with holes to drain water and dust particles entering into the switch assembly.
Further, the lever support is constructed with a pivot element that enables the lever (9) and lever support (8) to be fitted and moved together in a specified angle. The bracket (1) and the cover are provided with a guide or a slot to receive the said pivot element. Use of the pivot

element enables intact fitting of the bracket (1), the knob sub-assembly and the cover (10) such that the size of the switch assembly is reduced. Due to the reduced size and elimination of the metal CAM plate and fastening means such as flange headed self tapping screw made of metal, the reliability of the switch is enhanced.
Figure 6 illustrates exemplary views of a cover of the blinker switch assembly in accordance with an embodiment of the present invention.
The handle bar of a vehicle is disposed with switch cases in which one or more user operated switches are disposed within. The switch case which consists of the blinker switch assembly is provided with a slit (15) in the case front (16) to allow the lever of the blinker switch assembly to extend outwards the bracket (1). In one embodiment, the cover (10) of the blinker switch assembly is provided with an extension wall (17) adjacent to the slit (15) to prevent the entry of contaminating particles such as water, dust and so on, thereby, enhancing the reliability of the blinker switch assembly. In addition, the wall (17) also prevents entry of water thereby avoiding any metal to metal friction caused in the blinker switch assembly.
Figure 7 illustrates an exemplary view of the blinker switch assembly in accordance with another embodiment of the present invention. Figure 8 illustrates an exploded view of the blinker switch assembly in accordance with another embodiment of the present invention.
According to another embodiment of the present invention, the blinker switch assembly comprises a bracket (81) housing a carrier (82). The carrier (82) encases a moving contact (83), the said moving contact (83) is mounted inside the carrier (82) at a certain pressure achieved through a spring (84). A steel ball (85) is disposed behind the spring (84) such that the carrier (82) generates audible sound feedback when the carrier casing moves together from one position to another position. Further, a base (86) is disposed inside the bracket (81) at a fixed location with respect to the moving contact (83). The base (86) is mounted with one or more rivets which is also referred to as fixed contact that makes/breaks contact with the moving contact (83).
A lever assembly (87) comprising a lever support is locatable inside the bracket (81) and is mounted with an operating lever (88) which traverses outside the bracket (81). The lever (88) and the lever support (87) are pivoted at a pre-determined distance relative to the moving contact (83). The lever support (87) is provided with a pivot element and the bracket (81) is provided

with a guide for receiving the said pivot element. The lever support (87) is preferably made of plastic material. The lever assembly is at least partly protected by a cover (89) such that the lever assembly is sandwiched between the bracket (1) and the cover (89). The cover (89) is fitted to the bracket (81) by means of any fitting mechanism such as snap fitting. The cover (89) is provided with one or more mounting legs (90) which assist the blinker switch assembly for proper mounting within the switch case on the handle bar of the vehicle. Further, the cover (89) is also provided with a guide for receiving the pivot element and is provided with one or more holes to drain water and dust entering into the switch assembly. In addition, the cover (89) is provided with an extension wall to prevent the entry of contaminating particles such as water, dust and so on.
In the lever assembly, the lever support (87) is provided with a recess to receive a spring loaded ball or a plunger that acts as a follower. The follower moves over a profile of a CAM plate and hence referred to as cam follower. The CAM plate, preferably made of plastic material, is integrally molded with the bracket (81). A spring and a steel ball together referred to as a cam follower is housed inside the recess provided in the lever support (87). The lever support (87) and the lever (88) forming the lever assembly is operated by a knob (91) located outside the bracket (81). The knob (91) is fixed to the lever (88) by means of connecting mechanism such as snap fitting and so on. The knob (91), the lever (88), the lever support (87), along with a spring and a steel ball are referred to as knob sub-assembly. The said knob sub-assembly is said to be at ON position, when the knob sub-assembly is pressed in either left or right direction.
When the knob sub-assembly is pressed radially either to the left or to the right direction, the carrier (82) moves in the opposite direction and overlaps the moving contact (83) over the fixed contacts. The moving contact (83) thus makes contact with the fixed contacts causing the flow of conduction current between the moving and fixed contacts. The conduction current is supplied as a trigger signal to the electromechanical relay circuit which enables either of left or right blinkers to emit light based on the direction in which the knob sub-assembly is pressed. In order to stop the flow of current and to break the contact, the knob sub-assembly is pressed linearly so as to bring the carrier (82) to rest at a center position. The carrier (82) is brought to the center position by means of the CAM plate and the cam follower action. When the knob subassembly is at the center position, the moving contact (83) in the carrier (82) does not overlap with any of the fixed contacts, thus indicating that the blinker switch is at OFF condition.

The blinker switch assembly of the present invention is constructed with an integrated *V shaped CAM plate molded with the bracket (1), said CAM plate is preferably made of plastic material. The plastic CAM plate avoids the metal to metal friction caused by the entry of water and dust particles entering into the switch assembly, thus reducing the formation of corrosive environment inside the switch assembly. Further, the cover (89) is fitted to the bracket (81) without using any fastening means such as steel screws. Instead, the cover (89) is designed to be fitted to the bracket (81) using a snap fitting mechanism that requires no fastening means, thereby avoiding metal friction caused by contact of water or dust particles. Also, the cover (89) fitted to the bracket (81) prevents the upward or downward movement of the lever assembly. In addition, the cover (89) is provided with holes to drain water and dust particles entering into the switch assembly.
Further, the lever support is constructed with a pivot element that enables the lever (88) and lever support (87) to be fitted and moved together in a specified angle. The bracket (81) and the cover are provided with a guide or a slot to receive the said pivot element. Use of the pivot element enables intact fitting of the bracket (81), the knob sub-assembly and the cover (89) such that the size of the switch assembly is reduced. Due to the reduced size and elimination of the metal CAM plate and fastening means such as flange headed self tapping screw made of metal, the reliability of the switch is enhanced.
Figure 9 illustrates an exemplary view of a cam plate of the blinker switch assembly in accordance with an embodiment of the present invention.
The blinker switch assembly, hereinafter, shall refer to the blinker switch assemblies described in figs. 5 and 8. The CAM plate, preferably made of plastic material, is *V* shaped and is integrally molded with the bracket (1, 81). In the lever assembly, the lever support (8, 87) is provided with a recess to receive a spring loaded ball or a plunger that acts as a follower. In one embodiment, a spring and a steel ball together referred to as a cam follower is housed inside the recess provided in the lever support (8, 87). The follower moves over the CAM plate and hence referred to as cam follower. The profile of the CAM plate is designed so as to allow the cam follower move easily over the CAM plate within the bracket assembly when being operated.
Figures 10A and 10B illustrates perspective views of a bracket of the blinker switch assembly in accordance with an embodiment of the present invention.

In one embodiment, the bracket (1, 81) is provided with a projection (101) on the inside wall of the bracket (1, 81) to assist proper mounting of the lever (9, 88) inside the bracket (1, 81). As shown in fig. 10B, when the lever assembly is disposed inside the bracket (1, 81), a pair of guiding rails (102) located on the lever support (8, 87) and the projection (101) get locked to each other, thereby enabling proper mounting of the lever assembly within the bracket (1, 81). The projection (101) is locked between the guiding rails (102) thereby preventing the lever (9, 88) performing any incorrect operation. For example, when the lever (9, 88) is operated to move from center position to the left position or from the center position to the right position, push cancel operation is not operated and vice versa.
Figure 11 illustrates an exemplary view of a bracket of the blinker switch assembly in accordance with an embodiment of the present invention.
The bracket (1, 81) is provided with one or more mounting legs for enabling intact fitting with the cover (10, 89) of the blinker switch assembly. In one embodiment, the bracket is provided with two mounting legs. In another embodiment, an additional mounting leg is provided in the bracket (1, 81) to prevent back lash of switch when the knob (13, 91) is pushed.
Figure 12 illustrates a perspective view of a lever of the blinker switch assembly in accordance with an embodiment of the present invention.
In one embodiment, the thickness of the lever (9, 88) is modified to a minimum value, for example, the thickness of the lever is 1.6mm. The lever (9, 88) is designed with such modified thickness to enhance the durability of the lever (9, 88).
Figures 13A and 13B illustrate exemplary views of lever of the blinker switch assembly in accordance with an embodiment of the present invention.
In one embodiment, one end of the lever (9, 88) which interacts with the knob (13, 91) is modified (as shown in fig. 13B) to enable snap fitting of the lever (9, 88) with the knob (13, 91).
Figure 14 illustrates an exemplary view of a bracket of the blinker switch assembly in accordance with an embodiment of the present invention.

As shown in fig. 14, the bracket (1, 81) is provided with a detent profile (1401) on the inside wall of the bracket (1, 81) so as to provide a clear and better auditory feedback when the moving contact (3, 83) is operated. In one embodiment, the radius and the angle formed by the detent profile (1401) is modified. For example, the angle formed by the detent profile (1401) located on both left and right position is 121.9 degrees, whereas the angle formed by the detent (1401) profile located on the center positron is 86.7 degrees. The detent profile (1401) enables enhanced auditory feedback when the moving contact (3, 83) moves from center to right, center to left or when pushed inwards to be in a neutral position.
Figure 15 illustrates an exemplary view of a moving contact of the blinker switch assembly in accordance with an embodiment of the present invention.
In one embodiment, the thickness of the moving contact (3, 83) is increased to enhance the reliability of the moving contact (3, 83). For example, the thickness of the moving contact (3, 83) is increased to 0.8 mm so as to have an increased life time of the moving contact (3, 83) against wear and tear, and high current rating.
Figure 16 illustrates an exemplary front view of a base of the blinker switch assembly in accordance with an embodiment of the present invention.
In one embodiment, the base (6, 86) of the blinker switch assembly is constructed by increasing the heights of ribs (1601) located between the fixed contacts. The heights of the ribs are increased to prevent any current leakage between any two adjacent fixed contacts.
Figures 17, 17A and 17B illustrate exemplary rear views of a base of the blinker switch assembly in accordance with an embodiment of the present invention
In one embodiment, the base (6, 86) of the blinker switch assembly is constructed to support operation of a dual circuit (1701). Accordingly, the moving contact (3, 83) is also designed to support the operation of the dual circuit (1701). As shown in fig. 17A, a first circuit (1702) operates when the blinker switch assembly is actuated. When the lever (9, 88) is operated from center to left position, the dimples of the moving contact makes contact accordingly with the fixed contact on the base as shown as first position. Similarly, when the lever (9, 88) is operated from center to right position, the dimples of the moving contact makes contact accordingly with the fixed contact on the base as shown as second position.

As shown in fig. 17B, a second circuit (1702) is used for other applications, for example, to operate a parking switch when the corresponding lever is actuated. When the lever is operated from center to right position, the dimples of the moving contact makes contact accordingly with the fixed contact on the base as shown as first position. Similarly, when the lever is operated from center to right position and further to left position, the dimples of the moving contact makes contact accordingly with the fixed contact on the base as shown as second position. Further, when the lever is operated from center to left position, the dimples of the moving contact makes contact accordingly with the fixed contact on the base as shown as third position.
Accordingly, the blinker switch assembly is constructed so as to provide protection to various operating parts of the switch from direct entry of water, dust and other contamination particles. Further, the switch assembly is designed so as to eliminate metal friction and corrosive environment, thereby increasing the reliability of the switch assembly. In addition, the switch assembly is constructed with less number of parts, hence cheap and easy to manufacture. Thus a small-sized, cheap and a reliable blinker switch is achieved by the construction described in the above figures.
While the particular preferred embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the teachings of the invention. It is therefore contemplates that the present invention cover any and all modifications, variations or equivalents that fall within the scope of the basic underlying principles disclosed above and claimed herein.
ADVANTAGES OF PRESENT INVENTION
• Cover of the blinker switch assembly is provided with drain holes for effective draw off of water, dust and contamination particles.
• The blinker switch assembly is constructed with less number of parts and components with less weight.
• Design of the cover of the blinker switch assembly, especially the extension wall, enables protection of the components from entry of water and dust particles.

• Use of integrally molded plastic CAM plate eliminates metal to metal friction, thereby avoiding rusting and formation of corrosive environment.
• Eliminating the use of flange headed self tapping screw by sandwiching the lever assembly between the bracket and the cover also avoids metal friction.
• Enhanced life cycle, durability and reliability of the switch assembly.

We claim:
1. A blinker switch assembly mounted on the handle bar of at least two wheeled vehicles, said
switch assembly comprising:
(a) a bracket (1);
(b) a lever assembly comprising a lever support (8) locatable inside the bracket (1) and being mounted with an operating lever (9) which traverses outside the bracket
(1);
(c) a cover (10) for at least partly covering the said lever assembly located inside the
bracket (1);
wherein the said lever support (8) is provided with a pivot element and each of the bracket (1) and the cover (10) is provided with a guide for receiving the said pivot element.
2. The switch assembly as claimed in claim 1, wherein said bracket (1) is integrally molded with a cam plate which co-operates with the lever assembly for switch operation.
3. The switch assembly as claimed in claim 1, wherein said bracket (1) is provided with guiding slots on the inner surface for holding a cam plate.
4. The switch assembly as claimed in claims 2 or 3, wherein a cam follower comprising a spring (11) loaded with a steel ball (12) is disposed onto the said cam plate.
5. The switch assembly as claimed in claim 1, further comprising a carrier housing (2) disposed at one end of the said bracket (1), said housing (2) comprising a moving contact (3), a spring (4) and a steel ball (5) mounted inside the said housing (2).
6. The switch assembly as claimed in claim 1, further comprising a base (6) with at least one fixed contact (7) mounted at a predetermined distance relative to the said moving contact (3).
7. The switch assembly as claimed in claim 1, wherein said lever (9) and said lever support (8) are pivoted together at a predetermined distance.

8. The switch assembly as claimed in claim 1, further comprising a knob (13) fastened to the said lever (9) such that the said knob moves radially when the lever (9) is operated.
9. The switch assembly as claimed in claim 1, wherein said knob (13), lever (9), lever support (8) and cam follower referred together as a knob sub-assembly is pressed in either left or right direction such that the carrier housing (2) moves in an opposite direction.
10. The switch assembly as claimed in claim 2, wherein the said integrally molded cam plate is a V-shaped cam plate.
11. The switch assembly as claimed in claim 1, wherein the said cover (10) is provided with an extension wall, disposed inside the switch assembly, adjacent to a slit through which the said lever (9) traverses outward the said bracket (1).
12. A blinker switch assembly mounted on the handle bar of at least two wheeled vehicles, said switch assembly comprising:

(a) a bracket (1);
(b) a lever assembly comprising a lever support (8) locatable inside the bracket and being mounted with an operating lever (9) which traverses outside the bracket;
(c) a cover (10) for at least partly covering the said lever assembly located inside the bracket;
wherein said bracket (1) is integrally molded with a cam plate which co-operates with the lever assembly for switch operation.
13. A blinker switch assembly mounted on the handle bar of at least two wheeled vehicles, said
switch assembly comprising:
(a) a bracket (1);
(b) a lever assembly comprising a lever support (8) locatable inside the bracket and being mounted with an operating lever (9) which traverses outside the bracket;
(c) a cover (10) for at least partly covering the said lever assembly located inside the bracket;
wherein said bracket (1) is provided with guiding slots on the inner surface for holding a cam plate.

14. A blinker switch assembly substantially as herein described with reference to accompanying drawings.