Claims:1. A throttle lever assembly with auto choke return mechanism, the assembly comprising:
a. a casing comprising two halves defining a chamber there between, wherein the two halves are the first housing (101) and the second housing (102);
b. a torsional spring (103) having two ends (103a and 103b), wherein the torsional spring (103) is designed to hook against the wall of the first housing (101);
c. a spacer collar (104) to retain the torsional spring (103) against the wall of the first housing (101), during the function; and
d. a first lever shifter (105), wherein the first lever shifter (105) is movably mounted between the two halves (101 and 102) of the casing for pivotal movement about a pivot axis, wherein the first lever shifter (105) operates in to and fro movement, wherein the first lever shifter (105) is manually operated from the detent position to the maximum choke end position and returns automatically to the detent position from the maximum choke end position through operation of the torsion spring (103), which is appropriately positioned;

2. The assembly as claimed in claim 1, wherein the assembly (100) further comprises of a leaf spring unit (109) which provides required force to operate the first lever shifter (105).

3. The assembly as claimed in claim 1, wherein the first lever shifter (105) is built with one or more ribs (111), wherein the ribs (111) are designed and placed on the periphery of the first lever shifter (105) to strengthen the load bearing forces, during the operations.

4. The assembly as claimed in claim 1, wherein the first lever shifter (105) is further built with at-least one wall column (112), wherein the wall column (112) in the first lever shifter (105) is designed to enable one end (103b) of the torsion spring (103) to rest thereby, wherein the other end (103b) of torsion spring (103) rests on the wall of the first housing (101);

5. The assembly as claimed in claim 1, wherein the inner wall of the casing is connected with the spacer collar (104) and the leaf spring (109) whose two legs are placed in unique slots.

6. The assembly as claimed in claim 1, wherein the torsion spring (103) is composed of a spring steel material.

7. The assembly as claimed in claim 1, wherein the two ends (103a and 103b) of the torsional spring (103) are made of resin materials to reduce wear and noise.

8. The second housing (102) as claimed in claim 1, wherein the second housing (102) further comprises of an at least one wave spring (110), wherein the wave spring (110) attached to the second housing (102) aims to impart the required lever force.
, Description:[0001] PREAMBLE TO THE DESCRIPTION:
[0002] The following specification particularly describes the invention and the manner in which it is to be performed:
[0003] DESCRIPTION OF THE INVENTION:
[0004] Technical field of the invention
[0005] The present invention relates to a throttle lever assembly that provides an auto choke return enhancing mechanism at choke range providing an additional feature in a single operation of the throttle lever and thereby increasing the efficiency of the assembly.
[0006] Background of the invention
[0007] Lever shifters are mostly used in a variety of applications in order to remotely control various mechanisms of a machine such as power take-off, throttles, brakes, chokes, etc. The use of lever shifter control is well known in the field of devices such as vehicles, lawn mower, snow mobile, tiller, etc. The presence of these lever shifter controls enables the user to control the devices much easily and efficiently.
[0008] Various types of conventional lever shifter assembly that controls the choke range and detent mechanism are known in the prior art. Typically, the conventional lever shifter assembly does not facilitate for the choke return mechanism automatically at choke range. They are separated by two levers i.e. one for throttle and the other for choke calling for two different lever operations. Conventional lever shifter does not provide smooth functioning over a continuous choke operating range.
[0009] Hence there is a need for a throttle lever assembly that enables an auto choke return providing an additional feature in a single operation of the throttle lever mechanism at choke range and thereby increasing the efficiency therein.
[0010] Summary of the invention:
[0011] The present invention overcomes the drawbacks in the prior art and provides a throttle lever assembly with auto choke return mechanism. In a preferred embodiment, the assembly includes a casing having two halves, a torsional spring, a spacer collar, a first lever shifter, an abutment, at least one wave spring and a leaf spring unit. The two halves are the first housing and the second housing. The torsional spring having two ends is designed to hook against the wall of the first housing. The spacer collar retains the torsional spring against the wall of the first housing, during the operations. The first lever shifter is movably mounted in-between the two halves of the casing for pivotal movement about a pivot axis. The first lever shifter operates in to and fro movement and is manually operated from the detent position to the maximum choke end position and returns automatically to the detent position from the maximum choke end position through operation of the torsion spring, which is appropriately positioned;
[0012] In preferred embodiment of the invention, the assembly comprises of the first housing and the second housing which houses number of child parts like the wave spring, the leaf spring, the spacer, the washer, etc.
[0013] In preferred embodiment of the invention, the first lever shifter is integrated with at-least one column, wherein the column in the first lever shifter is designed to enable one end of the torsion spring to rest thereby, wherein the other end of torsion spring rests on the wall of the first housing.
[0014] In preferred embodiment of the invention, the torsion spring is made of special alloy steel is designed in such a way that one end of the spring rests against the unique wall column and the other end operates against a wall inbuilt in the second housing when assembled. Both ends of the torsional spring is covered with a sleeve of resin to control and minimize noise, vibration and harshness.
[0015] In preferred embodiment of the invention, the second housing further comprises of at least one wave spring, at least one spacer and at least one washer. The wave spring, spacer and the washer slide into the column of the second housing and aims to impart the required lever force.
[0016] The present invention provides a throttle lever assembly with auto choke return mechanism, which is easy to assemble and provides automatic choke return enhancing mechanism to detent position at choke range and is suitable for the applications in all kinds of vehicles.
[0017] It is to be understood that both the foregoing general description and the following details description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
[0018] Brief description of the drawings:
[0019] The foregoing and other features of embodiments will become more apparent from the following detailed description of embodiments when read in conjunction with the accompanying drawings. In the drawings, like reference numerals refer to like elements.
[0020] FIGURE 1 shows an exploded view of a throttle lever assembly with auto choke return mechanism, according to one embodiment of the invention.
[0021] FIGURE 2a shows the perspective of the choke lever shifter at detent position, according to one embodiment of the invention.
[0022] FIGURE 2b shows the perspective of the choke lever shifter at choke range, according to one embodiment of the invention.
[0023] FIGURE 2c shows the perspective of the choke lever shifter at detent position due to torsional spring, according to one embodiment of the invention.
[0024] FIGURE 2d shows the perspective of the wall column in the first lever shifter, according to one embodiment of the invention.
[0025] FIGURE 2e shows the perspective of the torsional spring, according to one embodiment of the invention.
[0026] Detailed description of the invention:
[0027] Reference will now be made in detail to the description of the present subject matter, one or more examples of which are shown in figures. Each example is provided to explain the subject matter and not a limitation. Various changes and modifications obvious to one skilled in the art to which the invention pertains are deemed to be within the spirit, scope and contemplation of the invention.
[0028] The present invention provides a throttle lever assembly that provides auto choke return mechanism at choke range. The assembly includes a casing having two halves a torsional spring, a spacer collar, a first lever shifter, an abutment, an at least one wave spring, spacer washer and a leaf spring. The spacer collar retains the torsional spring against the wall of the first housing, during the operations. The first lever shifter is movably mounted between the two halves for pivotal movement about a pivot axis and operates in to and fro movement. The first lever shifter is manually operated from the detent position to the pre-determined position and returns back automatically to the detent position from the pre-determined position through operation of the torsion spring.
[0029] The present invention provides a throttle lever assembly with auto choke return mechanism, which is easy to assemble and provides automatic choke return enhancing mechanism to detent position at choke range and is suitable for the applications in all kinds of vehicles.
[0030] FIGURE 1 shows an exploded view of a throttle lever assembly with auto choke return mechanism, according to one embodiment of the invention. In a preferred embodiment, the assembly includes a casing having two halves (101 and 102), a torsional spring (103), a spacer collar (104), a first lever shifter (105), an abutment (108), an at least one wave spring (110) and spacer washer (110a) and a leaf spring (109). The two halves are the first housing (101) and the second housing (102). The torsional spring (103) having two ends is designed to hook against the wall of the first housing (101). The spacer collar (104) retains the torsional spring (103) against the wall of the first housing (101), during the operations. The wave spring (100) is attached to the second housing (102) to impart necessary lever force. The first lever shifter (105) is movably mounted in-between the two halves (101 and 102) of the casing for pivotal movement about a pivot axis. The first lever shifter (105) operates in to and fro movement and is manually operated from the detent position to the maximum choke end position and returns automatically to the detent position from the maximum choke end position through operation of the torsion spring (103), which is appropriately positioned. The cable assembly is mounted on the abutment (108) and is housed within the casing and coupled to the first lever shifter (105). A control cable is connected to the casing through the abutment (108) through a hole in the casing. In the preferred embodiment, the assembly (100) having the leaf spring unit (109) is operatively connected in the second housing (102) for controlling to the first lever shifter (105).
[0031] FIGURE 2a shows the perspective of the choke lever shifter at detent position, according to one embodiment of the invention. In a preferred embodiment, the first lever shifter (105) loads the torsional spring at detent position or start position, during operating conditions. The first lever shifter (105) is built with one or more ribs (111). The ribs (111) are designed and placed on the periphery of the first lever shifter (105) to strengthen the load bearing forces, during the operations.
[0032] FIGURE 2b shows the perspective of the choke lever shifter at choke range, according to one embodiment of the invention. In a preferred embodiment, the first lever shifter (105) is manually operated from the detent position to the pre-determined position or choke range against the torsional spring (103).
[0033] FIGURE 2c shows the perspective of the choke lever shifter at detent position due to torsional spring, according to one embodiment of the invention. In a preferred embodiment, the first lever shifter (105) is returned back automatically to the detent position from the choke range through operation of the torsion spring (103)
[0034] FIGURE 2d shows the perspective of the column in the first lever shifter, according to one embodiment of the invention. In a preferred embodiment, the first lever shifter (105) is built with at-least one column (112), wherein the column (112) in the first lever shifter (105) is designed to receive one end (103a) of the torsion spring (103) to rest thereby, wherein the other end (103b) of torsion spring (103) rests on the wall of the first housing (101).
[0035] FIGURE 2e shows the perspective of the torsional spring, according to one embodiment of the invention. In a preferred embodiment, the torsional spring (103) has two ends (103a and 103b). The two ends (103a and 103b) of the torsional spring (103) are covered with the sleeves made of resin to minimize or reduce wear, noise and harshness.