FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
PROVISIONAL / COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION
Improved handlebar switch for automobile
2. APPLICANT
(a) NAME . SHUTHAM ELECTRIC LTD.
(b) NATIONALITY. An Indian company registered under the
Provisions of the Companies Act, 1956
(c) ADDRESS . GATN0.819/l/2,Sanaswadi,
Tal.Shirur,Pune 412208, M.S., India
3. PREAMBLE TO THE DESCRIPTION
PROVISIONAL COMPLETE
The following specification describes the The following specification
invention, particularly describes the invention and
the manner in which it is to be
performed.
4. DESCRIPTION (Description starts from page 2
5. CLAIMS: 8Nos.
6. DATE AND SIGNATURE: Given at the end of last page of specification.
7. ABSTRACT OF THE INVENTION: On separate page..

Title of invention: Improved handlebar switch for automobile.
Field of invention: The present invention is related to the
handlebar switches used for automobiles. More particularly, the present invention is related to the handlebar switches used in two-wheeler and three wheeler automobiles.
Prior art: The existing handlebar switches those are used for the
two-wheeler or three wheeler automobiles have following features in common. 1) Control of "Hi-low beam" with a knob, 2) Direction indicator, 3) Pass switch with knob, 4) Horn knob, 5) Light control switch.
Individual fixed contacts are provided for each of the above functions and they are connected by internal wiring and soldering along the individual contacts. The movable contacts are provided and operated with knobs so that the above functions can be achieved. The possibility of dry soldering or loose soldering is always present in the soldering operation on the fixed contacts. These faulty soldering can get loosened and the contacts get disconnected due to the vibration during the operation of the vehicle on the road. The loosened fixed contacts can touch each other and cause short circuit and sparking can occur. The sparking leads to oxidation of the contacts. The wires being manually soldered are prone to get interchanged causing wrong connections. The overall reliability of these switches is low due to this reason. This also can cause considerable inconvenience to the rider particularly when the contact gets disconnected while riding during the night as riding without the head light on during the night is dangerous on highways.
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Deficiencies in the prior art:
1) Cables connections are soldered manually hence likely to
interchange.
2) Dry & bad soldering due to which switch may get short-circuited.
3) Oxidation occurs on the contact surfaces due to loose contacts and sparking.
Objective of the present invention: The main objective of the present invention is to provide a reliable handlebar switch eliminating all the internal wiring operation in the handlebar switch & hence eliminate chances of interchanging of wires & short-circuiting of the switches by integrally molded fixed contacts in plastic body (referred to as fret).
Another objective of the present invention is to use "frets" i. e. the contact plates embedded in the plastic body during the molding operation, thus obviating all loose contacts. Yet another objective of the present invention is to obviate oxidation that occurs on the contact surfaces due to loose contacts and sparking.
Summary of the invention: The present invention "Improved handlebar switch for automobile" comprises total five switches in combination wherein the fixed contacts used are embedded in the plastic molding which will be referred to as "fret" herein after in the description. These switches control the functions are given bellow.
1) Control of "Hi-low beam" with a knob,
2) Direction indicator,
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3) Pass switch with knob,
4) Horn knob,
5) Light control switch.
Four numbers of frets are used in the present invention for provision of the fixed contacts. These frets are joined together to form a fret assembly. The said four frets are divided in two pairs and each pair is integrally molded together to form two fret assemblies. The conductive areas on the frets are formed by first stamping the conductive areas together on a sheet of conductive material different conductive areas on the fret being connected with bridges (not shown in the drawings) to maintain the rigidity during the molding operation. The stamped conductive plate is then molded in plastic to form the fret having conductive areas and the nonconductive areas of the plastic molding material. The said bridges between the different areas of the conductive part are then broken to form conductive areas electrically isolated from each other to form individual fixed contacts in the switch. The above-mentioned functions are then obtained by using contact plates operated by appropriate knobs. The contact plates make contact with different conductive areas on the fret to connect the required functional element e.g. head light to the power supply and hence operate it. The conductive areas in the frets remain fixed as they are embedded in the plastic molding in the stationary member of the switch and are connected to power supply from battery and other functional elements as per their functions which are described in detail in the description as given bellow.
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The frets being fixed in the stationary members of the switch there is no internal wiring required for connecting the fixed contacts as
they are connected in the prior art handlebar switches, thus achieving the objectives of the present invention as mentioned above.
Brief description of the drawings: The present invention is now described bellow in detail with help of following figures.
Fig.1 shows the complete assembly of the switch with all five switches and choke, which is mounted on the handle bar.
Fig.1A shows the isometric view of the handle bar switch.
Fig.2 shows front view and bottom view of the light control switch. Fig.2A shows view of the section A-A of the light control switch with reference to Fig. 2.
Fig.2B shows view of the section B-B of the light control switch, with reference to Fig. 2.
Fig.3 shows top view and side view of the direction indicator switch.
Fig.3A shows the view of section B-B of the direction indicator switch, with reference to Fig. 3.
Fig.3B shows the view of the section A-A of the direction indicator switch, with reference to Fig.3.
Fig.4 shows the side view of the high low switch.
Fig.4A shows the view of the section A-A of the high low switch, with reference to Fig.4.
Fig.5 shows the side view and the bottom view of the pass switch.
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Fig.5A shows the view of the section B-B of the pass switch, with
reference to Fig. 5.
Fig.5B shows the view of the section B-B of the pass switch, with
reference to Fig. 5.
Fig. 6 shows the side view of the horn switch.
Fig. 6A shows the view of the section A-A of the horn switch, with
reference to Fig 6.
Fig. 7A shows circuit diagram of light control switch in off position.
Fig. 7B shows circuit diagram of light control switch in parking
lamp "on" position.
Fig. 7C shows circuit diagram of light control switch in parking
lamp and high beam in "on" position.
Fig. 7D shows circuit diagram of light control switch in parking
lamp and low beam in "on" position.
Fig. 8A shows circuit diagram of right-left indicator switch in "off"
position.
Fig. 8B shows circuit diagram of right-left indicator switch in left
indicator "on" position.
Fig. 8C shows circuit diagram of right-left indicator switch in right indicator "on" position.
Fig. 9A shows circuit diagram of pass switch in "off" position.
Fig. 9B shows circuit diagram of pass switch in "on" position.
Fig. 9C shows circuit diagram of horn switch in "off" position.
Fig. 9D shows circuit diagram of horn switch in "on" position.
Fig. 10 shows the top view and side view of the light control switch in OFF position.
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Fig.10A shows the side view of the light control switch for OFF position.
Fig.10B shows the position of the contacts of the contact plate on
the fret for the OFF position for light control switch.
Fig. 11 shows top view and side view of the of the light control
switch in the parking lamp "on" position.
Fig.11A shows side view of the light control switch in parking lamp
"on" position.
Fig. 11B shows the position of the contacts of the contact plate
with fret for parking lamp "on" position of light control switch.
Fig. 12 shows the side view and top view of the light control switch
for the headlamp "on" position.
Fig.l2A shows the side view of the light control switch for the
headlamp "on" position.
Fig.l2B shows the position of the contacts of the contact plate
with fret for the headlamp "on" position, in the light control switch.
Fig. 13 shows the top view and side view of the switch illustrating
the OFF position of the direction indicator switch.
Fig.l3A shows the side view of the OFF position of the direction
indicator switch.
Fig.l3B shows the position of the contacts of the contact plate
with fret for the direction indicator switch for OFF position.
Fig. 14 shows the side view and top view of the switch illustrating
the left indicator ON position for the direction indicator switch.
Fig.l4A shows the side view of the direction indicator switch for
the left indicator ON position.
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Fig.l4B shows the position of the contacts of the contact plate with the fret of the direction indicator switch for the left indicator
ON position.
Fig. 15 shows the top view and side view illustrating the right
indicator ON position for the direction indicator switch.
Fig.l5A shows the side view of the right indicator ON for the
direction indicator switch.
Fig.l5B shows the position of the contacts of the contact plate
with the fret of the direction indicator switch for the right indicator
ON position.
Fig. 16 shows the high beam position of the high low switch.
Fig.l6A shows the side view of the high beam position of the high
low switch.
Fig.l6B shows the position of the contacts of the contacts of the
contact plate with fret for the high beam position of the high low
switch.
Fig. 17 shows the low beam position of the high low switch.
Fig.l7A shows the side view for the low beam position for the high
low switch.
Fig.l7B shows the position of contacts of the contact plate with
the fret for the low beam position for the high low switch.
Fig. 18 shows the top view and side view illustrating the OFF
position of the pass switch.
Fig.l8A shows the side view of the pass switch for the OFF
position.
Fig.l8B shows the position of the contacts of the contact plate
with fret of the pass switch for the OFF position.
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Fig. 19 shows the side view and top view illustrating the ON position of the pass switch.
Fig.l9A shows the side view of the ON position of the pass switch. Fig.l9B shows the position of the contacts of the contact plate
with fret of the pass switch for the ON position. x
Fig.20 shows the side view and top view illustrating the OFF
position of the horn switch.
Fig.20A shows the side view of the OFF position of the horn switch.
Fig.20B shows the position of the contacts of the contact plate
with the fret of the horn switch for the OFF position.
Fig.21 shows the top view and side view illustrating the ON
position of the horn switch.
Fig.21A shows the side view of the horn switch for ON position.
Fig.21B shows the position of the contacts of the contact plate
with fret for the ON position of the horn switch
Description: The foregoing objects of the invention are
accomplished and the problems and shortcomings associated with
prior art techniques and approaches are overcome by the present
invention as described bellow in the preferred embodiment.
This invention is illustrated in the accompanying drawings, through
out which like reference letters indicate corresponding parts in the
various figures.
In accordance with the present invention, Fig.1 shows the complete assembly of the handle bar switch. Switch is having two main sub assemblies i.e. upper assembly (22) and bottom assembly (23). Light control switch (LCS) (2.00), High low switch
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(4.00), Pass switch (5.00) are incorporated in the upper assembly (22). Direction indicator (D.I.) (3.00) and Horn switch (6.00) are
incorporated in the bottom assembly. This whole assembly with lever (8.00) is mounted on the handle bar (9.00). Four frets (101), (102), (103) and (104) are used to provide the fixed contacts in the switch. Out of these fret (101) and (103) are integrally molded together while frets (102) and (104) are integrally molded together.
Fig.2 shows the side view and bottom view of the light control switch. Fig.2A is the view illustrating the section B-B of the light control switch & Fig. 2B is the view illustrating the section A-A of the light control switch. In the Light control switch, LCS contact plate (205) along with LCS contact pressure spring (204) and LCS plunger (203) fitted in the LCS contact plate carrier (202), this whole assembly inserted in the top cover, the LCS knob (201) and split pin (206) fitted in the LCS contact plate carrier (202). Fret (101) is provided with the fixed contacts of the switch. LCS switch is having three positions,
1) OFF position,
2) Parking position,
3) Head lamp "on" position.
Fig. 10 shows the OFF position, (2051), (2052) and (2053) are the contacts on the contact plate. In this position contact plate (205) moves on the top insert fret (101). Contact takes place on the same conductive area (2) of the fret and the nonconductive area (7C), and thus switch is in OFF position. Position of the contact plate (205) on the fret (101) is also shown in the fig. 10B. In
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Fig.10B fret is divided in to seven areas marked with numerals (1) through (7). The contacts (2A), (2B) and (2C) are on the fret 101. When the contacts of the contact plate (2051), (2052) and (2053) touch the corresponding contacts on the fret (101), i. e. (2A), (2B), and (7A) respectively then the switch is in OFF position. Fig. 7A shows the circuit diagram showing this position. The conductive areas on the fret (101) are shown as numerals (2), (3), (4) and (5). The contact plate is represented by (205).
Fig. 11 shows the parking lamp "on" position of the switch; in this position contact plate (205) moves on the top insert fret 101. Fig. 11B shows the position of the contacts of the contact plate (205) with reference to the fret (101). When the contact points (2051), (2052) and (2053) on the contact plate touch the contact points (3B), (3A) and (4A) respectively, then contact takes place between conductive areas (3) and (4) and parking light (701) is ON. The Fig. 7B shows the circuit diagram of the switch in this position.
Fig. 12 shows head lamp "on" position of the switch, in this position contact plate (205) is on the top insert fret (101) and headlamp is ON. Position of the contacts of the contact plate with fret is shown in the fig.l2B. The contact points (2051), (2052) and (2053) on the contact plate touch the points (3C), (5A) and (4B) on the fret (101) respectively connecting conductive areas (3), (4) and 5 together then the parking lamp (701) and head lamp (702) are in ON position. Fig 7C illustrates the circuit diagram of the switch in this position.
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Fig. 4 shows the side view of the high low switch. Fig. 4A shows the sectional view A-A of the high low switch with reference to Fig.
4. In this switch plunger (407), cam (408), spring (409), contact plate (410), pin (411) are inserted in the top fret base (506) then lock washer (405), conical spring (404), spring (403), actuator (402), and high low knob (401) are assembled and fitted in the top cover.
This switch has two positions,
1) High beam,
2) Low beam.
Fig. 16 shows the high beam position, when knob (401) is pressed; the plunger (407) moves the cam (408) and contact plate (410) moves on the top fret (103). Conductive areas (15) and (14) are connected and switch is ON. Fig.l6B shows the position of the contacts on the contact plate (410) with fret (103). Contact points (4101) and (4102) are the contact points on the contact plate while, (14A) & (15A) are the points on the conductive areas on the fret. When the knob (401) is pressed, contacts (4101) and (4102) on the contact plate touch the points on the fret (14A) & (15A) respectively and high beam position is achieved. In this position parking lamp (701) and the high beam lamp (702) both are in "on" position. Fig.7C illustrates the high beam "on" position of the switch by means of a circuit diagram.
Fig.17 shows the low beam position. In this position, when knob (401) is pressed, the plunger (407) moves the cam (408) (shown in Fig. 4) moving the contact plate (410) on the top fret (103) and switch gets operated. Fig.l7B shows the position of the contacts of
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the contact plate with reference to fret. Contact points (4101) and (4102) are the points on the contact plate (410) while, (15A) &
(16A) are the contacts on the fret (103). When knob (401) is pressed, contact points (4101) & (4102) touch the points (15A) & (16A) respectively on the fret connecting conductive areas (15) and (16) and low beam switch is operated thus the low beam lamp (703) is turned on and high beam lamp (702) is turned off. The low beam position of the switch is illustrated in the circuit diagram shown in Fig. 7D.
Fig.3 shows the top view and the side view of the direction indicator switch (D.I.). Fig. 3A shows the sectional view B-B & Fig. 3B shows the sectional view A-A respectively, with reference to Fig. 3. The Contact plate (315) with compression spring (314) & steel ball (313) is inserted in the contact plate carrier (312). This sub assembly is inserted in the indicator switch cover. D.I. knob (316) fitted to the indicator lever (306) and spring washer (303), top washer (304) fitted in the lever (306) with the help of screw (302). This whole assembly with bottom bracket (601) and top plate (308) is fitted in the bottom cover. Direction indicator switch has three positions,
1) OFF position,
2) Left indicator ON position,
3) Right indicator ON position.
Fig. 13 shows OFF position of the Direction Indicator switch, in this position contact Plate (315) moves on the non-conductive area on the bottom fret (102) and thus contact with conductive areas is broken and switch is in OFF position. Fig. 13B shows the position
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of the contact plate (315) with the fret. Conductive areas (8), (9) & (10) are contact areas & (11) & (12) are non-contact (non conductive) areas. (3151) And (3152) are the points on the contact plate & (12A) & (11A) are the points on nonconductive areas (12) and (11) on the fret. When the points (3151) and (3152), touch the points on the fret (12A) and (11A) respectively then the switch is in OFF position. This position of the switch is illustrated by a circuit diagram in Fig. 8A.
Fig. 14 shows the left indicator ON position, contact plate (315) moves on the bottom fret (102) towards left and thus contact takes place. Fig.l4B shows the position of the contact plate (315) with the fret (102). In this position the contact points (3151) and (3152) on the contact plate touch the points (10A) and (9A) respectively, connecting conductive areas (9) and (10) actuating the left indicator in ON position. This position of the switch is illustrated by the circuit diagram shown in Fig. 8B.
Fig. 15 shows the Right indicator ON position. Contact plate (315) moves on the bottom fret (102) towards right side and right indicator is ON. Fig.15B shows the position of the contact plate (315) on the fret (102). Areas (8), (9) and (10) are the conductive contact areas on fret (102), when knob (316) operates for right indicator ON position, contacts (3151) and (3152) on the contact plate (315) touch the contact points (9A) and (8A) on the fret (102) respectively thus conductive areas (8) and (9) are connected and the switch is in right indicator ON position. The circuit diagram illustrating this position of the switch is shown in Fig. 8C.
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Fig.5 shows the top view and the side view of the pass switch. Fig. 5A shows the view of the section B-B & FIG. 5B shows the
sectional view of the section A-A with reference to Fig. 5. The contact plate (503), spring (504), spring (502) and knob (501) are fitted in the contact plate carrier (505). This whole assembly with top fret base is then inserted in the top cover (22). Pass switch has two positions,
1) OFF position,
2) ON position.
Fig. 18 shows the OFF position of the switch. In this position when knob (501) is not pressed, the contacts (5031) and (5032) on the contact plate (503) touch the points on the on the top fret (103) on same conductive area (13) and hence the switch is in OFF position. Fig.l8B shows the position of the contacts of the contact plate (503) with the fret (103). The points (5031) and (5032) are on the contact plate and (13A) & (13B) the contact points on the conductive area (13). This position of the switch is illustrated in circuit diagram shown in Fig. 9A.
Fig 19 shows the ON position of the switch, when knob (501) is pressed, the contact plate (503) moves on the top insert fret (103) and thus contact takes place and switch is in ON position. FIG.19B shows the position of the contacts on the points on the contact plate with fret. The contact points (5031) & (5032) are on the contact plate (503) & points (13B) & (14A) are the contact points on the conductive areas (13) and (14) on fret (103). When knob (501) is pressed, the said points (5031) and (5032) touch the points (13B) & (14A) respectively thus connecting the
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conductive areas (13) and (14) and the switch is in ON position. The circuit diagram illustrating this position of the switch is shown in Fig 9B where the numerals (13) and (14) indicate the conductive areas on the fret (103) and (702) is the headlamp. Fig 6 shows the side view of the horn switch. FIG.6A shows the view of the section A-A of the horn switch with reference to Fig. 6. Contact plate (605), spring (604) are assembled in the contact plate carrier (603), this assembly with knob (601), spring (602) are inserted in the bottom fret base (104). This whole assembly is fitted in the bottom cover (23).
Horn switch has two positions.
1) OFF position,
2) ON position.
Fig.20 shows the OFF position of the switch. In this position, when knobs 601 is not pressed. The contacts (6051) and (6052) on the contact plate (605) touch the bottom fret (104) in the same area and thus switch is in OFF position. FIG.20B shows the position of the contact plate with the fret. Area (20) shows the contact area on fret (104) and (6051) & (6052) are the contact points on the contact plate (605). When switch is in OFF position then the points (6051) & (6052) on the contact plate touch the points 20A & 20B respectively on the same conductive area (20). This position of the switch is illustrated by a circuit diagram in Fig. 9C wherein the numerals (20) and (21) represent the conductive areas of the fret (104) and contact plate is shown as (605). The horn is shown by the numeral (901).
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Fig.21 shows the ON position of the switch. When horn knob (601) is pressed, the contact plate (605) moves on the bottom fret (104)
and thus contact takes place and horn (901) is operated. Fig. 21B shows the position of the contact plate (605) with respect to the fret (104). Conductive areas (20) and (21) are the contact areas on the fret (104). Contact points (6051) & (6052) are provided on the contact plate (605), while (21A) & (20B) are the contact points on the fret (104). When the knob (601) is pressed, points (6051) & (6052) on the contact plate touch the contact points (21A) & (20B) on the fret (104) respectively, connecting conductive areas (21) and (20) hence operating the horn (901). This position of the switch is illustrated by a circuit diagram in Fig. 9D wherein the numerals (20) and (21) represent the conductive areas of the fret (104) and contact plate is shown as (605).
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art techniques and approaches are overcome by the present invention described in the present embodiment.
Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure or matter.
The embodiments of the invention as described above and the methods disclosed herein will suggest further modification and
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alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the spirit and
scope of the invention; which is defined by the scope of the
following claims.
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We claim
1. Improved handlebar switch for automobile comprising,
the assembly of the handle bar switch; the said switch having two main sub assemblies i.e. upper assembly (22) and bottom assembly (23); light control switch (LCS) (2.00), high low switch (4.00), pass switch (5.00) being incorporated in the upper assembly (22) while direction indicator (D.I.) (3.00) and horn switch (6.00) being incorporated in the bottom assembly(23); this whole assembly together with lever (8.00) being mounted on the handle bar (9.00) wherein,
the fixed contacts in the said switches are formed of conductive sheet metal molded in non conductive plastic material the said fixed contact assemblies being referred to as frets; at least one fret assembly being used in the said switch; the surface areas of the said frets being divided in nonconductive areas and conductive areas isolated electrically by the said nonconductive areas on the fret; the said conductive areas forming the fixed contacts of the said switch while the movable contacts being formed by the contact plates (205), (315), (501) and (605) fixed to the respective knobs of each individual switch; four frets (101), (102), (103) and (104) being used to provide the fixed contacts in the switch; out of these said frets, (101) and (103) being integrally molded together while frets (102) and (104) being integrally molded together.
2. Improved handlebar switch for automobile as claimed in claim 1
wherein the said frets are manufactured by first forming the
isolated conductive areas of the fret as bridged together to form a
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single stamping; molding the said stamping in nonconductive plastic material and then breaking the said bridges to form
conductive areas on the said fret isolated by the nonconductive areas of the plastic molding material.
3. Improved handlebar switch for automobile as claimed in claim 1
wherein the said fret (101) being used for providing the fixed
contacts for light control switch (2.00) being provided with
conductive areas (2), (3), (4) and (5) and contact plate (205)
fixed on knob (201) accomplishing following functions of the
switch;
1. contact plate (205) connecting said conductive area (2) only, the switch being in off position;
2. contact plate (205) connecting said conductive areas (3) and (4), the switch being in parking lamp "on" position and the parking lamp (701) being "on";
3. contact plate (205) connecting said conductive areas (3), (4) and (5), the switch being in head lamp "on" position, the parking lamp (701) and head lamp (702) being "on'' in this position.
4. Improved handlebar switch for automobile as claimed in claim 1
wherein the said fret (102) being used for providing the fixed
contacts for high beam switch by means of conductive areas (8),
(9) and (10) being connected by contact plate (315) when the
knob (401) is pressed and contact plate is moved by the cam
(408) to connect the said conductive areas to turn "on" the head
lamp (702) and parking lamp (701).
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5. Improved handlebar switch for automobile as claimed in claim l
wherein the said fret (103) being used for providing the fixed
contacts for low beam switch by means of conductive areas (14), (15) and (16) being connected by contact plate (410) when the knob (401) is pressed and contact plate is moved by the cam (408) to connect the said conductive areas to turn "on" the low beam lamp (703).
6. Improved handlebar switch for automobile as claimed in claim 1 wherein the said fret (103) being used for providing the fixed contacts for pass switch by means of conductive areas (13) and (14) being connected by contact plate (503) when the knob (501) is pressed and contact plate is moved by the knob (501) to connect the said conductive areas to turn "on" the headlamp.
7. Improved handlebar switch for automobile as claimed in claim 1 wherein the said fret (104) being used for providing the fixed contacts for horn switch by means of conductive areas (20) and (21) being connected by contact plate (605) when the knob (601) is pressed and contact plate is moved by the knob (601) to connect the said conductive areas to turn "on" the horn.
8. Improved handlebar switch for automobile as claimed in claim 1
as substantially described hereinbefore, with reference to the


accompanying drawings.
Dated this 20th day of December, 2006
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Abstract
Improved handlebar switch for automobile comprising, the assembly of the handle bar switch; the said switch having two main sub assemblies i.e. upper assembly (22) and bottom assembly (23); light control switch (LCS) (2.00), high low switch (4.00), pass switch (5.00) being incorporated in the upper assembly (22) while direction indicator (D.I.) (3.00) and horn switch (6.00) being incorporated in the bottom assembly(23); this whole assembly together with lever (8.00) being mounted on the handle bar (9.00) wherein, the fixed contacts in the said switches are formed of conductive sheet metal molded in non conductive plastic material the said fixed contact assemblies being referred to as frets; at least one fret assembly being used in the said switch; the surface areas of the said frets being divided in nonconductive areas and conductive areas isolated electrically by the said nonconductive areas on the fret; the said conductive areas forming the fixed contacts of the said switch while the movable contacts being formed by the contact plates (205), (315), (501) and (605) fixed to the respective knobs of each individual switch; four frets (101), (102), (103) and (104) being used to provide the fixed contacts in the switch; out of these said frets, (101) and (103) being integrally molded together while frets (102) and (104) being integrally molded together.