FORM 2 THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
2. TITLE OF THE INVENTION:
STOPPER UNIT FOR TENSIONER
3. APPLICANTS:
(a) NAME ADVIK HI-TECH PVT LTD
(b) NATIONALITY Company Registered in India
(c) ADDRESS Gat No. 357/99, Chakan Talegaon Road,
Village Kharabwadi, Chakan, Tal. Khed, Pune -410501, Maharashtra India
Email: info{a>advik.co.in
PRREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in
which is to be performed

STOPPER UNIT FOR TENSIONER FIELD OF THE INVENTION
10011 The present invention relates to a tentioner for applying tension to a bendable, transmission member in the internal combustion engine. More particularly, the present invention is related to a stopper unit for tensioner which inserted through a pin hole in the tensioner body for locking the plunger in position against the movement in a direction projecting out from the tensioner body. BACKGROUND OF THE INVENTION
[002J In internal combustion engines, transmission member such as a chain/cam chain is used for transmitting rotation from a crankshaft to one or more valve-operating the camshafts. During transmitting the rotation from the driving shaft to a driven shaft i-e. from the crankshaft to one or more valve-operating the camshafts, the chain/cam chain elongates due to the effect of thermal expansion and resu.ts into slackening of chain and the like. In order to maintain the tension (tightness) of the chain and/or to overcome the slackening, the use of tensioner is known in the prior art. The tensioner is Placed in proximity to the chain within the engine which applies force on the chain in order to tighten the same.
1003] In general, the tensioner includes a plunger, a spring and a rotary shaft arranged inside the tensioner body. For providing load to the belt or the chain, the rotary shaft is energized by spring force which makes plunger to advance in forward direction. [004] However, since such tensioner is energized by a spring, there are the chances of unexpected advancement of the plunger and projecting it out from the body of the tensioner before its installation on the vehicle as well as it is also to take into consideration at time of uninstalling the tensioner from the vehicle. For this purpose,

the tensioner is provided with a stopper mechanism which locks the advancement of the
plunger.
[005] In the existing stopper mechanism, a pin hole having a small diameter is formed
in the tensioner body. The advancement of the plunger is locked by inserting the
stopper pin into pin hole of the tensioner body in the connecting state of the pin hole of
rotary shaft. After installation of the tensioner on the vehicle, the urging operation of
the plunger due to the spring force is performed by pulling out the stopper pin to
remove the locking of the plunger.
[006) FIG. 7 illustrates a tensioner assembly. The prior art provides a stopper (15)
having elastically deformable stopper parts (15a). The disadvantage of this prior is that
it jerks out from the tensioner body or breaks down in high vibrational environment
such as during packaging and transportation. Additionally, there is no exiting prior art
that provides a good griping feature during the use of stopper. Many times, the stopper
gets slip off while holding or using.
[007] The polymer stoppers are now in trend due to their low manufacturing cost;
however they lack in strength and usually get bend or twist when the relatively greater
force is applied to operate stopper which makes it unusable for further use.
[008] In the conventional stopper mechanism, it is required to retract the plunger
before locking it. However, this retraction requires additional equipment such as screw
driver etc. and becomes time consuming.
[009] In view of above, there is always a need of a stopper with a good strength and
low manufacturing cost which is also capable of positioning (retraction) the plunger as
well locking in operative condition of tensioner.
SUMMARY OF THE INVENTION

10010] Embodiments of present invention provide a tensioner which comprises a body adapted to mount in proximity of transmission media, a plunger adapted to slide-ably project out from a first opening of the body, a rotary shaft adapted to guide the plunger which is configured to rotate and deliver axial motion to plunger; a spring acting between the body and the rotary shaft to urge the plunger in a direction to project from the first opening, and a stopper adapted to remove-ably insert in a second opening of the body and in a slit formed in the rotary shaft. The stopper comprises a grip and an insert characterized in that the insert includes a protruded engagement portion having locking means capable of securing the stopper inside the body, thereby locks the rotary shaft in an inoperative condition in which a plunger is retracted into the body. [0011] An aspect of the present invention provides the protruded engagement portion which includes a dome shape sections having a plurality of teeth as the locking means. [0012] Another aspect of the present invention provides the protruded engagement portion which includes a cylindrical shape section having locking means such as a plurality of circumferentially distributed locking ribs on the outer surface of the cylindrical shape section.
[0013] A further aspect of the present invention provides the protruded engagement portion which includes a tapered-cylindrical section having locking means such as a plurality of vertical ribs distributed on the outer surface of the tapered-cylindrical section.
[0014] Another aspect of the present invention provides the protruded engagement portion includes a tapered-cylindrical section having locking means such as a plurality of thread distributed on the outer surface of the tapered-cylindrical section. [0015] A further aspect of the present invention provides the protruded engagement portion includes dome shape sections having a plurality of teeth as the locking means

and secondary teeth distributed on the side edges of the insert for snug-locking of the stopper in the second opening of the body.
[0016] Accordingly, few objects of the present invention are listed below: [0017] It is an object of the present invention to provide a stopper adapted to remove-ably fit inside the body of the tensioner to lock the rotary shaft for prevention of forward projection of plunger in an inoperative condition of the tensioner. [0018] It is another object of the present invention to provide a tensioner with a non-droppable stopper due to vibrations during packaging and transportation. [0019] It is also an object of the present invention to provide a cost effective stopper made of one or more of plastic, thermoplastic, nylon or polymer material. [0020J It is yet an object of the invention to provide a stopper capable of retracting the plunger inside the body.
[00211 It is yet an alternate object of the invention to provide a stopper comprising a grip which includes a grip support adapted to held or operate the stopper by hand without a slip. The grip support is carved on the grip for creating abrasion between the hand and/or other operating device. BRIEF DESCRIPTION OF DRAWINGS
[0022] The above mentioned and other objects, features, and advantages of the invention will best be understood from the following description of various embodiments thereof, selected for the purposes of illustration, and shown in the accompanying drawings. The drawing illustrates various embodiment of the invention which is not to be construed as limited.
[0023] FIG. 1A illustrates a schematic view of a tensioner (100) in accordance to a first embodiment of the present invention;

[0024J FIG. IB illustrates a partial view of a tensioner (100) with stopper in
accordance to the first embodiment of the present invention;
[0025] FIG.1C illustrates a schematic view of stopper in accordance to the first
embodiment of the present invention;
[0026] FIG. 2A illustrates a partial view of a tensioner (100) with stopper in
accordance to the second embodiment of the present invention;
[0027] FIG.2B illustrates a schematic view of stopper in accordance to the second
embodiment of the present invention;
[0028] FIG. 3A illustrates a partial view of a tensioner (100) with stopper in
accordance to the third embodiment of the present invention;
[0029] FIG.3B illustrates a schematic view of stopper in accordance to the third
embodiment of the present invention;
[0030] FIG. 4A illustrates a partial view of a tensioner (100) with stopper in
accordance to the fourth embodiment of the present invention;
[0031] FIG.4B illustrates a schematic view of stopper in accordance to the fourth
embodiment of the present invention;
[0032] FIG.5A illustrates a front view of stopper in accordance to the fifth
embodiment of the present invention;
[0033] FIG.5B illustrates a side view of stopper in accordance to the fifth embodiment
of the present invention;
[0034] FIG.5C illustrates a perspective view of stopper in accordance to the fifth
embodiment of the present invention;
[0035] FIG.6A illustrates a front view of stopper in accordance to the sixth
embodiment of the present invention;

[0036| FIG.6B illustrates a side view of stopper in accordance to the sixth embodiment
of the present invention;
|0037| F1G.6C illustrates a perspective view of stopper in accordance to the sixth
embodiment of the present invention;
[00381 FIG.7 illustrates a prior art.
[0039] List of elements:
1. Body 10
2. First opening (of body) 10a
3. Second opening (of body) 10b
4. Spring 11
5. Rotary shaft 12
6. Spacer 13
7. Plunger 14
8. Dowel 15
9. Cap 16
10. Retainer 17
11. Clip 18
12. Washer 19
13. Stopper 20
14. Grip 20a
15. Insert 20b
16. Engagement portion 20c
17. side edges (of insert) 20d
18. Vertical locking ribs cl, c2, c3, c4
19. Horizontal locking rib 20r

20. Grip support 20g DETAILED DESCRIPTION OF THE INVENTION
[0040] The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiments. [0041] As used herein, the terms 'tensioner' and 'tensioner assembly' are used interchangeably to refer to a tensioner.
[0042] As used herein, the terms 'protruded engagement portion' and 'engagement portion' are used interchangeably to refer to bulge out portion of the insert surfaced on the stopper.
[0043] As used herein, the term 'locking means' and 'engagement portion' are used interchangeably to refer to design made on the insert part of stopper for fall-free insertion of stopper inside the body.
[0044] As used herein, the term 'second opening' is referred as 'pin hole' which are used interchangeably.
[0045] Referring to FIG. 1, an embodiment of present invention provides a tensioner (100). The non-limiting elements of tensioner (100) includes a body (10) which includes two openings, namely a first opening (10a) and a second opening (10b); a spring (11), rotary shaft (12), a plunger (14), spacer (13), nut (14), dowel (15), cap (16), retainer (17), clip (18), washer (19), a stopper (20) which includes a grip (20a) and an insert (20b). The tensioner (100) is adapted to mount in proximity of transmission media such as chain or belt etc.
[00461 The spring (11) acts between the body (10) and urges the rotary shaft (12) to rotate and further the rotary shaft (12) is adapted to make the plunger (14) to advance in a direction to project out the from the first opening (10a). The plunger (14) is slide-ably

adapted to project out from the first opening (10a) of the body. Further, the stopper is adapted to remove-ably insert in the second opening (10b) of the body (10) and further in a slit (12a) formed on the rotary shaft (12). Embodiment 1
[0047] The FIG. IB and FIG. 1C illustrate first embodiment of the present invention. As shown, the stopper (20) is made to have two parts: a grip (20a) and an insert (20b). The grip (20a) is enabled to be used by user to push the stopper inside the tensioner body (10). The stopper (20) can be hold manually or using some holding devices for its insertion inside the body (10). The insert (20b) includes a protruded engagement portion (20c) which is adapted to go inside second opening (10b) (pin hole) of the body (10) and bottom portion of insert (20b) further goes in to the slit (12a) formed in rotary shaft (12).
[0048] In this embodiment of the present invention, the protruded engagement portion (20c) is imbedded with multiple locking means which enable the proper securing of the stopper (20) inside the body (10). With the help of protruded engagement portion (20c), the stopper is prevented from falling due to mechanical vibrations during packaging, transportation and during other events.
[0049] In the embodiment, the protruded engagement portion (20c) includes dome shape sections having a plurality of teeth as the locking means. The dome shape section strengthens the stopper structure and also enables the stopper (12) to rotate inside the body for retracting the plunger (14).
[0050] In the embodiment, the locking means are plurality of teeth and secondary teeth distributed on the side edges (20d) of the insert (20c) for snug-locking of the stopper (20) in the second opening (10b) of the body (10). In some embodiments, the second opening (10b) of the body (10) is threaded internally for allowing rotation of stopper to

retract back the plunger (14) inside from the first opening (10a) of the body (10). The pitch of the threads of the second opening (10b) of the body (10) is preferably equal to the pitch of teeth (s), plurality of teeth on protruded engagement portion (20c) and secondary teeth (s) on side edges (20d) of the insert (20c).
[0051J In the embodiments of the present invention, the plurality of teeth can be (1, 2, 3... and/or n). In one embodiment, there can be one teeth surfaced over the protruded engagement portion (20c). In other embodiment, there can be two or three teeth surfaced over the protruded engagement portion (20c). Embodiment 2
[0052] The FIG. 2A and FIG. 2B illustrate second embodiment of the present invention. In this embodiment, the protruded engagement portion (20c) includes a cylindrical shape section having locking means such as a plurality of circumferentially
distributed horizontal locking ribs (cl, c2, c3, c4 ) distributed on the outer surface of
the tapered-cylindrical section. The plurality of horizontal locking ribs (cl, c2, c3,
c4 ) distributed on the outer surface of the cylindrical shape section gets locked with
the thread provided internally on the second opening (10b) of the body (10). After insertion of the insert (20b) in the slit (12a) of shaft (12), the stopper (20) locks the rotary shaft (12) for preventing the projection of the plunger (14) in inoperative condition of tensioner (100). Embodiment 3
[0053] The FIG. 3 A and FIG. 3B illustrate third embodiment of the present invention. In this embodiment, the protruded engagement portion (20c) includes a tapered-cylindrical section having locking means such as a plurality of vertical ribs (20r) distributed on the outer surface of the tapered-cylindrical section. The plurality of vertical ribs (20r) distributed on the outer surface of the tapered-cylindrical section gets

locked internally in the second opening (10b) of the body (10). After insertion of the insert (20b) in the slit (12a) of rotary shaft (12), the stopper (20) locks the rotary shaft (12) for preventing the projection of plunger (14) in inoperative condition of tensioner. Embodiment 4
[0054] The FIG. 4A and FIG. 4B illustrate fourth embodiment of the present invention. In this embodiment, the protruded engagement portion (20c) includes a tapered-cyiindrical/conical section having locking means such as a plurality of thread (20p) distributed on the outer surface of the tapered-cylindrical section. The plurality of thread (20p) distributed on the outer surface of the tapered-cylindrical gets locked internally in the second opening (10b) of the body (10). After insertion of the insert (20b), the stopper (20) locks the rotary shaft (12) for preventing the projection of the plunger (14) in inoperative condition of tensioner. Embodiment 5
[0055] The FIG. 5A, FIG. 5B and FIG. 5C illustrate fifth embodiment of the present invention. In this embodiment, the grip (20a) is adapted to hold or operate the stopper manually or using other operating device. The grip (20a) includes a grip support (20g) adapted to held or operate the stopper by hand without a slip. The grip support (20g) is carved on the grip (20a) for creating abrasion between the hand or other operating device. In the embodiments, the grip support (20g) is dots of material distributed/surfaced on the grip (20a) for creating abrasion for better griping. The grip support (20g) can be vertical/horizontally/angled hair lines of material surfaced of the grip (20a). Embodiment 6
[0056] FIG. 6A, FIG. 6B and FIG. 6C illustrate sixth embodiment of the present invention. In this embodiment, the grip (20a) is configured to be grasped manually, and

an insert (20b) is attached to the grip (20a) and arranged to be inserted inside the tensioner assembly through the grip (20a). The insert (20b) includes at least one protruded engagement portion (20c) which is surfaced with one or more teeth for securing the stopper (20) inside the tensioner to keep the tensioner in inoperative condition. In this embodiment, the stopper does not include secondary teeth distributed on the side edges (20d) of the insert (20b).
|0057] It will be appreciated that the various aforementioned embodiments (Embodiment 1,2,... Embodiment 6) can be combined or interchanged and components therefrom combined or interchanged in any appropriate manner. In particular, the design of the engagement portion and locking means as described in various embodiments can be combined and/or interchanged. In preferred mode of present invention, the stopper is made of one or more of polymer such as plastic, thermoplastic, nylon etc. However, the stopper can be of any feasible metal or other materials now known or later discovered.
[0058] The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. Further, it is to be noted that the design of tensioner is depiction purpose only. The scope of the present invention revolves around stopper design. The tensioner design can be different, altered or modified partially or completely.
[0059] The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood

that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We Claim:
1. A tensioner (100) comprising:
a body (10) adapted to mount in proximity of transmission media; a plunger (14) adapted to slide-ably project out from a first opening (10a) of the body (10);
a rotary shaft (12) adapted to guide the plunger (14) which is configured to rotate and deliver axial motion to plunger (14);
a spring (11) acting between the body (10) and the rotary shaft (12) to urge the plunger (14) in a direction to project from the first opening (10a), and
a stopper (20) adapted to remove-ably insert a second opening (10b) of the body (10) and in a slit (12a) formed in the rotary shaft (12), wherein the stopper (20) comprises a grip (20a) and an insert (20b) characterized in that the insert (20b) includes a protruded engagement portion (20c) having locking means capable of securing the stopper (20) inside the body (10), thereby locks the rotary shaft (12) in an inoperative condition in which a plunger (14) is retracted into the body (10).
2. The tensioner (100) as claimed in claim 1, wherein the protruded engagement portion (20c) includes dome shape sections having a plurality of teeth as the locking means.
3. The tensioner (100) as claimed in claim 1, wherein the protruded engagement portion (20c) includes dome shape sections having a plurality of teeth as the locking means and secondary teeth distributed on the side edges (20d) of the insert (20c) for snug-locking of the stopper (20) in the second opening (10b) of the body (10).
4. The tensioner (100) as claimed in claim 1, wherein the protruded engagement portion (20c) includes a cylindrical shape section having locking means such as a plurality of

circumferentially distributed horizontal locking ribs (cl, c2, c3...) on the outer surface of the cylindrical shape section.
5. The tensioner (100) as claimed in claim 1, wherein the protruded engagement portion (20c) includes a tapered-cylindrical section having locking means such as a plurality of vertical ribs distributed on the outer surface of the tapered-cylindrical section.
6. The tensioner (100) as claimed in claim 1, wherein the protruded engagement portion (20c) includes a tapered-cylindrical section having locking means such as a plurality of thread distributed on the outer surface of the tapered-cylindrical section.
7. The tensioner (100) as claimed in claim 1, wherein the grip (20a) is adapted to held or operate the stopper manually or using other operating device.
8. The tensioner (100) as claimed in claim 7, wherein grip support (20g) is carved on the grip (20a) for creating abrasion for proper gripping to operate the stopper without a slip.
9. The tensioner (100) as claimed in claim 1, wherein the second opening (10b) of the body (10) is threaded internally for allowing rotation of stopper to retract back the plunger (14) inside the from the first opening (10a) of the body (10).
10. A stopper for tensioner assembly comprising:
a grip (20a) configured to be grasped manually and
an insert (20b) attached to the grip (20a) and arranged to be inserted inside the tensioner assembly through the grip (20a) wherein the insert (20b) includes at least one protruded engagement portion (20c) surfaced with one or more teeth for securing the stopper (20) inside the tensioner to keep the tensioner in inoperative condition.