FROM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
1. TITLE OF THE INVENTION
AUTOMATIC DECOMPRESSION ASSEMBLY 2. APPLICANT
(a) NAME: ADVIK HI-TECH PVT LTD
(b) NATIONALITY: Indian Company
Gat No. 357/99, Chakan Talegaon Road, Village Kharabwadi, Chakan,
(c) ADDRESS: Tal. Khed, Pune-410501, Maharashtra
India
2. PRREAMBLE TO THE DESCRIPTION
The following specification
particularly describes the
invention and the manner in
which it is to be performed

AUTOMATIC DECOMPRESSION ASSEMBLY
FIELD OF INVENTION
[001] The present invention relates to an automatic decompression assembly. More specifically, the present invention is related to an automatic decompression assembly of an internal combustion engine of saddle type vehicles.
BACKGROUND OF THE INVENTION [002] Prior Art: The internal combustion engine generally includes a decompressor which operates a valve at low engine speeds to relieve compression within one or more engine cylinders during the compression stroke of the engine cycle.
[003] There are many prior art documents that describe decompression assembly of an internal combustion engine. In conventional internal combustion engine, a decompression mechanism is used to release compression of exhaust gases from combustion chamber to ease cranking on the starting of the engine. Typically, the decompression mechanism actuates a flyweight fixed in between the air intake rocker arm and the air intake valve. It opens an intake valve or an exhaust valve at the beginning of the engine cylinder's compression stroke. [004] The known automatic decompression assemblies conventionally use spring-loaded flyweights on the camshaft to operate a pin located inside the camshaft or a decompressor rocker arm. At rest and below idle rpm, the spring

held in the flyweights thereby the pin touches base of the exhaust valve or rocker arm to release compression.
[005] There are some drawbacks associated with the automatic decompression assemblies known in the prior art such as they generally use expensive and nearly unprocurable raw material. Further, they include complicated process to produce the part by sintering process. Mostly, prior arts include brittle raw material that can break at high speed/high torque of the engine. Further, if the any part such as flyweight and/or spring gets break it is very difficult to repair or maintain. In such cases, it requires changing the whole assembly. Furthermore, most of the decompressor's flyweights create noise due to the use of hard material while engine is in running condition.
[006] Detailed Description of Prior Art: FIG. 1 depicts an existing decompressor (100) that includes a sprocket (102) and a flyweight (104) attached to the sprocket (102) through a pin (110) and a pivot (108). The flyweight (104) swivels in inward and outward direction with the help of spring (112). As shown in FIG. 1, the pivot is fixed/press-fitted, hence in case of breakdown of any part, it is difficult to replace the spring/flyweight alone. The whole decompressor has to be replaced that in turn increases the expense. [007] Hence, in the light of the above discussion it is required to devise an automatic decompression assembly that can overcome one or all disadvantages of the prior art.

SUMMARY OF THE INVENTION
[008] Accordingly, embodiments of the present invention provide an automatic decompressor assembly that comprises: a base plate; a spring and a flyweight adapted to arrange on the base plate and to fluctuate by an arrangement of the spring, characterized in that the flyweight is comprised of a first part and a second part wherein the second part comprises grooves to be coupled with the first part, and thereby with the base plate; further wherein the first part adapted to secure the spring through a detachable fastener comprising a cap-like modular member.
[009] It is an object of the present invention to provide a detachable fastener that comprises an elongated coupling member to be fitted within a slot on the first part and extending through the base plate to engage the spring, and the caplike modular member is configured to be modularly fitted inside a top end and/or a bottom end of the elongated coupling member. In an aspect of the present invention, the elongated coupling member comprises surfaced thread configuration similar with the thread configuration of the cap-like modular member. Further, the first part and the second part of the flyweight are made of sheet metal. The elongated coupling member is preferably a rod-like member, a cylinder, a screw, a pivot or a fastener etc.
[010] It is an object of the present invention to provide a flyweight made up of sheet metals preferably in two parts that allow it to withstand higher stress and also eliminates the problem of noise caused by the earlier used brittle material.

[Oil] Some of more aforementioned advantages of the present invention are considered by providing a detachable fastener that allows the easy replacement of spring in case of break down.
BRIEF DESCRIPTION OF DRAWINGS
[012] FIG. 1 depicts an automatic decompressor assembly in accordance as
disclosed in a prior art;
[013] FIG. 2A depicts a flyweight of an automatic decompressor assembly in
accordance with an embodiment of the present invention;
[014] FIG. 2AB depicts an automatic decompressor assembly in accordance
with another embodiment of the present invention;
[015] FIG. 3A depicts an automatic decompressor assembly in accordance with
another embodiment of the present invention;
[016] FIG. 3B depicts an automatic decompressor assembly in accordance with
a further embodiment of the present invention, and
[017] FIG. 4A depicts an automatic decompressor assembly in accordance with
a further embodiment of the present invention.
[018] FIG. 4B depicts an automatic decompressor assembly in accordance with
yet a further embodiment of the present invention.
DETILED DESCRIPTION OF EMBODIMENTS
[019] As depicted in FIG. 2A and FIG. 2B, an automatic decompressor assembly 200 includes a base plate 202 and a flyweight 204. The flyweight 204

adapted to arrange on the base plate 202 and to fluctuate by an arrangement of
the spring 208.
[020] In an embodiment of the present invention, the flyweight 204 is
comprised of a first part 204a and a second part 204b wherein the first part 204a
of flyweight 204 comprises grooves 210 for the attachment with second part
204b. The first part 204a of flyweight 204 further includes a circular groove to
fix on the base plate 202.
[021] In an embodiment of the present invention, the spring 208 is arranged in
such a way that a first lug 208a of spring 208 is fixed to the base plate -202 by
passing through the second part 204b of the flyweight 204 and a second lug
208b adapted to be fixed directly on the base plate 202.
[022] As depicted in FIG. 3 A and FIG. 3B, the first part 204a of flyweight 204
is adapted to secure the spring 208 through a detachable fastener 302. The
detachable fastener 302 includes a cap-like modular member 302a and an
elongated coupling member 302b. The elongated coupling member 302b is
adapted in a way that it enables the detachable fastener 302 to fit within a slot
214 on the first part 204a and extend through the base plate 202 to engage the
spring 208.
[023] In an embodiment of the present invention, the cap-like modular member
302a is configured to modularly fit inside top end of the elongated coupling
member 302b. In the embodiment, the cap-like modular member 302a and the
elongated coupling member 302b have similar thread specification for snug
fitting. In some embodiment of the present invention, the cap-like modular

member 302a and the elongated coupling member 302b may have other type of fitment such as snap fitment etc.
[024] Referring to FIG. 4A and FIG. 4B, in another embodiment of the present invention, the detachable fastener 402 comprises an elongated coupling member 402a to fit inside a slot 214 on the first part 204a and extend through the base plate 202 to engage the spring 208 and the cap-like modular member 402b is configured to be modularly fitted inside a bottom end of the elongated coupling member 402a. In the embodiment, the cap-like modular member 402b and the elongated coupling member 302b have similar thread specification for snug fitting. In some embodiment of the present invention, the cap-like modular member 402b and the elongated coupling member 402a may have other type of fitment such as snap fitment etc.
[025] In preferred embodiments of the present invention, the elongated coupling member 302 and/or 402 are a rod-like member such as hollow, semisolid or solid cylinder, screw, pivot or fastener etc. The one or more aforementioned advantages can be considered by providing the detachable fastener 302 or 402 as they allows the easy removal of the spring 208 and the flyweight 204 in case of break down or faulty condition. Such design is also an advantage for the testing of spring/flyweight with the decompressor assembly. [026] In an embodiment of the present invention as shown in FIG. 2A, the spring 208 comprises a first lug 208a adapted to be fixed with the base plate 202 and a second lug 208b adapted to be fixed with the second part 204b of the flyweight. The automatic decompressor assembly as claimed in claim 1, wherein

the spring is replaceable in case of tearing by the way of the cap-like modular member.
[027] In an embodiment of the present invention, the first part 204a and the second part 204b of the flyweight 204 are made of sheet metal. In other embodiments of the present invention, the first part 204a and the second part 204b of the flyweight are made of iron and/or steel part and joined by one or more mechanisms such as welding, brazing, and riveting by means of rivets or screw joint or by any other means.
[028] In another embodiment of the present invention, the automatic decompressor assembly includes a base plate 202, a spring 208 and a flyweight 204. The flyweight is arranged on the base plate 202 as a single unit and fluctuates by the arrangement of the spring 208. The flyweight 204 is adapted to secure the spring 208 through a detachable fastener 302 and/or 402.

*
WE CLAIM:
1. An automatic decompressor assembly comprising:
a base plate; a spring and a flyweight wherein the flyweight is adapted to fluctuate by arrangement of the spring over the base plate, characterized in that the flyweight is comprised of a first part and a second part wherein the second part comprises grooves for securing the first part, and thereby with the base plate; further the first part is adapted to secure the spring through a detachable fastener that comprises a caplike modular member at one end.
2. The automatic decompressor assembly as claimed in claim 1, wherein the detachable fastener comprises an elongated coupling member adapted fit within a slot on the first part and extending through the base plate to engage the spring, and the cap-like modular member is configured to be modularly fitted on a top end of the elongated coupling member.
3. The automatic decompressor assembly as claimed in claim 1, wherein the detachable fastener comprises an elongated coupling member adapted fit within a slot on the first part and extending through the base plate to engage the spring, and the cap-like modular member is configured to be modularly fitted inside a bottom end of the elongated coupling member.
4. The automatic decompressor assembly as claimed in preceding claims, wherein the elongated coupling member comprises surfaced thread

configuration similar with the thread configuration of the cap-like modular member.
5. The automatic decompressor assembly as claimed in claim 1, wherein the first part and the second part of the flyweight are made of sheet metal.
6. The automatic decompressor assembly as claimed in claim 1, wherein the spring comprises a first lug adapted to be fixed with the base plate and a second lug adapted to be fixed with the second part of the flyweight.
7. The automatic decompressor assembly as claimed in claim 1, wherein the spring is replaceable in case of tearing by the way of the cap-like modular member.
8. The automatic decompressor assembly as claimed in claim 1, wherein the first part and the second part of the flyweight are made of iron and/or steel part and joined by one or more mechanisms such as welding, brazing, riveting by means of rivets or screw joint or by any other means.
9. An automatic decompressor assembly comprising:
a base plate; a spring and a flyweight adapted to arrange on the base plate and to fluctuate by the arrangement of the spring, characterized in that the flyweight is adapted to secure the spring through a detachable fastener, the detachable fastener comprises an elongated coupling member to be fitted within a slot extending through the base plate to engage the spring, at least one cap-like modular member

configured to modularly fit inside a top and/or a bottom end of the elongated member. 10. The automatic decompressor assembly as claimed in preceding claims, wherein the elongated coupling member is preferably a rod-like member similar to one or more of a cylinder, a screw, a pivot or a fastener etc.