SHOCK ABSORBERS

Description

The Related Art

The invention relates to shock absorber used in passenger and driver seats in public transportation vehicles and relates to an embodiment and production method providing easy production and single piece structure of the piston body and the valve moving in vertical axis in this body.

The present invention relates to shock absorbers comprising a shock absorber shaft and on-off pin embedded inside this shaft and valve body connected to said on-off pin and outer cylinder, and relates to a piston body, which has a single piece structure produced independently from said outer cylinder and placed inside the outer cylinder, and a valve body having a single piece structure placed inside said piston body.

Background of the Invention

Shock absorbers are supportive members used in many different areas according to their purposes of usage. Shock absorber of the invention relates to shock absorbers, which are adapted to the backrest area used as reclining surface at the vehicle seats, and which ensure movement of the backrest area. These seats commonly used in passenger and driver seats in public transportation vehicles in the prior art are the type, back part of which can be adjusted for comfort and passenger satisfaction. These seats have a structure, which can be fixed at the desired position, operate via latch, and have lockable property. However, these shock absorbers do not have the desired performance and usage quality.

In the shock absorber embodiment used in the prior art and adapted to the backrest surface of the vehicle seat and providing movement of the backrest surface; when the passenger reclines the backrest surface of the seat by leaning back and then brings the backrest back to its normal position, the shock absorber which has lost its functionality before the end of its expected life can not bring the backrest to the normal position with the desired amount or force. Even most of the time, passengers bring the reclining surface to the normal position by manually intervening. However, the backrest surface has to be brought to the normal position via oil and gas pressure without the need of intervention of the passenger. This situation forms an undesired situation in shock absorbers.

The valve chamber of the shock absorbers used in the prior art; is provided via levels and chambers formed after when the cylinder inner surface is processed by high technology machines. On the other hand, when it is brought together with the power transfer bodies commanding the product found at the seat on which the shock absorber is fixed, it is determined that the pusher pin of the shock absorber does not perform its function completely in cases of even small frictions, contractions of the seat, friction of the accessory, and rusting of the power transfer bodies due to lack of oil.

Moreover, during production of this type of pistons, the mounted parts of the impermeability members on the piston, which have very narrow tolerances and have to be processed sensitively, have to have zero tolerance. Because the piston valve loses oil when it is jammed during locking or not fitting into its place and leaks oil since it is slightly loose, it is seen that valve can not perform its function.

Some applications are encountered in the patent research made about the vehicle seat shock absorbers. Among these applications; a patent application with German origin with no US2009236783 is found as registered in the name of STABILUS GMBH(DE). In this application; a cylinder having a closed volume filled by gas, a piston positioned inside this cylinder, a safety member positioned at the chamber in which said piston is placed, and a second safety member are found and when the pressure inside the cylinder is very low, the first safety member connects the first operation chamber to outside with the piston chamber and brings it to the desired time.

Another application is the German origin patent application with no US2008315470, which is registered in the name of STABILUS GMBH(DE). In this application, the invention is a cylinder having a closed volume and this cylinder is filled with fluid in order to form pressure inside and a piston is found inside the cylinder moving in vertical axis and this piston separates the cylinder into a first operation chamber and a second chamber. The piston also comprises a shaft.

Description of the Invention

The purpose of the invention is to provide a shock absorber bringing a novelty and having different technical properties than the shock absorber embodiments used in the prior art.

A purpose of the invention is to form the valve and piston body without the requirement of processing of the valve and the piston body on which the valve is placed by lathe and grinding machines in a sensitive manner, but by cutting the already produced shock absorber pipes in certain lengths and by giving the desired form via bending method.

Another purpose of the invention is to prevent the requirement of making sensitive surface processing in lathe and grinding machines as a result of giving shape to the material of the valve and the piston body having pipe form shaped via the bending method. In this way, the purpose is to obtain an operation having low production cost, easy production and minimizing production processes.

A purpose of the invention is to extend the expected life of the valve by increasing the tightness of the o-ring, which is the impermeability member between the valve and the piston.

Another purpose of the invention is to provide the pressure chamber, in which the piston valve is placed, have an independent and single piece structure in pipe form in order to form the conditions in which the inner surface of the piston has to be smooth during friction of the o-ring.

Another purpose of the invention is to provide the RA's of the internal surfaces of the pressure chambers having single piece structure have smooth high surface quality. Another purpose of the invention is to provide an outwards curve to the oil passage hole via a special method in order to prevent the operation performance of the o-rings found on the valve at the inner surface of the piston from being affected in case of perforation of the pressure chamber having single piece structure from outer surface. In this way, the purpose is to eliminate said risk. In order to achieve the above said purposes, the present invention relates to shock absorbers comprising a shock absorber shaft and on-off pin embedded inside this shaft and outer cylinder and valve body connected to said on-off pin, and comprises a piston body, which has single piece structure produced independent from said outer cylinder and placed inside the outer cylinder, and a valve body having single piece structure placed inside the piston body.

In order to achieve the above said purposes and in order to provide easy and quick production of the shock absorber, the present invention comprises at least one piston body having single piece structure obtained by bending method via bending surfaces and at least one valve body again having single piece structure obtained by the same bending method and embedded inside this piston body.

Figures for Better Understanding of the Invention

Figure-1 ; is the two dimensional completely side section view of the shock absorber, which is the subject of the invention.

Figure-2; is the two dimensional close plan section view of the main piston body having single piece structure and the shock absorber, which is the subject of the invention.

Figure-3; is the sectional perspective view of the main piston body having single piece structure.

Figure-4; is the close plan perspective view of the oil hole of the main piston body. Figure-5; is the representative view of the oil passage areas and oil transfer inside the shock absorber via arrows.

Figure-6; comprises the sectional views showing the sequential production steps of the piston body.

Figure-7; comprises the sectional views showing the sequential production steps of the valve body.

Figure-8; comprises the sequential mounting steps of the locking pin and the valve mechanism.

Figure-9; comprises the views showing sequential mounting steps of the adaptation of the valve mechanism to the piston body. Part Numbers

10- Shock absorber

11- On-off pin

12- Shock absorber shaft 13- Impermeability o-ring

14- Valve connection nuts

15- Valve connection washers 15.1 Oil passage channels

16- Valve body

17- Piston body

18- Oil hole

19- Dished surface

20- O-ring recession

21- O-ring

22- Throttle part

23- Outer cylinder

24- Retainer surfaces

25- Oil passage cavity

26- Pressure chamber

27- Internal wall

28- Bending surfaces

29- Concaves

30- Piston internal rear chamber

31- Piston internal front chamber 32- Valve mechanism

33- Retaining washers

34- Washer hole

35- Outer cylinder front chamber

36- Outer cylinder rear chamber Detailed Description of the Invention

In this detailed description, the preferred embodiments of the shock absorber (10), which is the subject of the invention, are disclosed only for better understanding of the subject and without forming any limiting affect.

The present invention relates to shock absorbers (10) comprising a shock absorber shaft (12) and on-off pin (11) embedded inside this shaft (12) and outer cylinder (23) and valve body (16) connected to said on-off pin (11), and it comprises a piston body (17), which has single piece structure produced independent from said outer cylinder (23) and placed inside the outer cylinder (23), and a valve body (16) having single piece structure placed inside the piston body (17).

The piston body (17) comprises oil passage cavity (25) and retainer surfaces (24) formed at the base region, a throttle part (22) having a structure narrowing at its upper region with regards to the base region, a hole (18) providing transfer of the oil found at the pressure chamber (26) of said piston body (17) from the piston internal rear chamber (30) to the piston internal front chamber (31) and dished surface (19) formed at the surface of this oil hole (18) facing towards the internal wall (27), at least one o-ring recession (20) formed on said piston body (17), at least one o-ring (21) positioned between said o-ring recession (20) and the inner surface of the outer cylinder (23), impermeability o-ring (13) positioned between the shock absorber shaft (12) and the on-off pin (11), and at least one valve connection nut (14) and valve connection washer (15) fixed on the on-off pin (11). In order to provide easy and quick production of said shock absorber (10), at least one piston body (17) having single piece structure obtained as a result of cutting of the already produced shock absorber pipe in certain length and bending of it via bending surfaces (28) and at least one valve body (16) embedded inside this piston body (17) are obtained. Production method of the shock absorber (10) is as follows: while the piston body (17), which has a diameter less than the outer cylinder (23) inner diameter, is in pipe form (where this piston body (17) having pipe form has the same material and the same production quality with the outer cylinder (23)), preferably, firstly the oil hole (18) is perforated in lathe machine or via a different machine or mechanism and then dished surface (19) is formed by application of pressure on the oil hole (18) from the inner surface via a pressure component such as a ball. The purpose in formation of the dished surface (19) is to ensure problem free and smooth operation of the valve body (16), which is moved on the x-axis at the inner surface of the piston body (17). Afterwards, bending operation is applied on the same lathe machine or via a different mechanism. Throttle part (22) and o-ring recessions (20) of the piston body (17), which is bent from the bending surfaces (28) via bending operation, are formed. With this operation, a piston body (17) is obtained, which has RA high quality surface quality, is made of single piece and easy and quick to produce. Connection of the piston body (17) with the shock absorber shaft (12) is ensured via threads formed at the shaft (12) end and the internal wall surface of the throttle part (22) of the piston body (17). The piston body (17) and the shock absorber shaft (12) are fixed via screwing method from the throttle part (22) (See figure-9). Valve body (16) is produced by the same production method with the piston body (17). Concaves (29) and bending surfaces (28) are obtained by exposing the valve body (16), which is cut into desired diameter and length, to bending operation preferably in the revolve lathe machine. O-rings (21) are positioned on the concaves (29). While in Figure-2, the view of the shock absorber (10) in locked position is given, in Figure-5; its open position is given.

The way of operation of the shock absorber (10) is as follows: when pushing force is applied in the x-axis line on the locking or on-off pin (11) embedded with the shock absorber shaft (12), since the shock absorber shaft (12) is integral with the mechanism (32) inside the outer cylinder (23) as seen from the outside of the shock absorber, pressure is applied on the mechanism (32) in the x-axis towards inside the outer cylinder (23) and the pressurized oil found inside the piston internal rear chamber (30) passes to the piston internal front chamber (31) and thus oil transfer is accomplished and the mechanism (32) is brought into open state. The oil passage transfer in the valve mechanism (32) is accomplished in this way (See figure-5).

The shock absorber pipe, or in other words, the mechanism (32) found inside the outer cylinder (23) applies pressure on the pressurized oil piston internal rear chamber (30) in x-axis direction, and at this moment, since the on-off pin (11) and spring group mechanism (32) found inside the piston body (17) are under pressure towards x-axis, the oil hole (18) is in open state, and the pressurized oil passes through the internal hole (34) of the retaining washers (33) found at the outer cylinder (23) rear chamber (36) and passes to the piston internal rear chamber (30) found inside the piston, and from here transferred to the piston internal front chamber (31) found inside the piston by being transferred from the oil passage channels (15.1) of the valve connection washers (15). And from here, by passing through the oil hole (18) arrives at the outer cylinder front chamber (35) and thus the transfer operation is accomplished. During operation of the shock absorber in the opposite direction, oil transfer occurs in opposite direction and the operation is accomplished with the same performance.

In Figure-6, the sectional views showing the sequential production steps of the piston body (17) are given. Throttle part is formed from the piston body (17) via bending method. In Figure-7, the sectional views showing the sequential production steps of the valve body (16) are given. O-ring recessions (20) are formed via bending method on the valve body (16), which again has a pipe form, is made of the same quality material with the piston body (17) and the outer cylinder (23), but has different pipe diameters. After formation of the first o-ring recession (20), before formation of the second, washer (15) is placed between and later on the second o-ring recession (20) is formed via bending method. The valve connection washer (15) is enclosed between these o-ring recessions (20). Later on, they are cut into desired lengths. In Figure-8, the mounting steps of the valve mechanism (32) are given. Firstly, connection nut (14) is fixed on the on-off pin (11). Afterwards, washer (15), on which multiple numbers of oil passage channels (15.1) formed, is mounted. Then, the valve body (16) and then the second washer (15) enclosed within the valve body (16) is mounted. At last, valve connection nut (14) and spring are mounted at the end of the pin (11). In Figure-9, the mounting of the valve mechanism (32) is given, wherein its mounting inside the piston body (17) is completed. When the valve mechanism (32) is placed in the piston body (17), the retaining washers (33) are mounted and lastly o- ring recession (20) is formed on the piston body (17) bent from the bending surfaces (28). Finally it is adapted inside the outer cylinder (23) via the o-ring (21) mounted to the o-ring recession (20).

While the above described operations are made, when the force applied on the on-off pin (11) is removed while the stroke distance is in any position, with the reaction of the spring found on the valve mechanism (32) found inside the piston body (17), it instantly pushes the mechanism (32) forwards, closes the oil hole (18) and thus the transfer operation stops. In this way, the shock absorber (10) is fixed in the desired position.

The protection area of this application has been specified under claims and cannot be limited to the descriptions only given as sampling above. It is obvious that a person skilled in the related art can apply the innovation disclosed by this invention into similar purposed other areas by means of changing the parts in form and/or using similar structures. Therefore, it is also clear that such embodiments lack of innovation criteria.