The present invention relates to a sliding door system used in vehicles, particularly used in commercial and passenger vehicles. PRIOR ART

Door stoppers known in the present art provide the sliding doors, used in pluralities of sectors, to stay in the open position. At the present time, various door stoppers are used. There are leaf spring systems, twist spring systems and press spring systems, and moreover, there are door stoppers made of plastic. These stoppers use bending properties of plastics as spring. The common characteristic of all these systems is that they fulfill their functions by using a single spring. The momentum/force tolerance range in the production of said springs is 7.5-10%. This tolerance range leads to 15-20% change in the force/momentum exerted by the spring to the door stopper. Thus, due to the spring comprised by the door stopper, the force exerted to the sliding door systems cannot provide the same values in every production, it cannot be stable. In the present system, since the door stoppers have a single spring and since there is no adjustability thereon, it is not possible to adjust the opening and closing efforts of said door stoppers.

In the present art, as a result of hitting of the doors, which amount up to 63 kg, to the wedges with 60-80 shore hardness in the range of 0.5-2 mm for the momentum obtained in the movement of the doors up to 1 .4 meters, the following problems occur,

• Tearing, crushing in the wedges, and removal from the place thereof as a result of tearing of the connection element

· Deformation of the guide whereon the mechanism moves and falling of the door as a result of removal from the place thereof in case of severe deformations • In cases where the wedges are provided on the door, deformation of the body sheet by means of hitting by the wedge and leading to visual faults

• Deformation of the mechanism and increasing the usage/movement efforts of the door and leading to function loss at a level which can be sensed by the customer · Reinforcement for preventing deformation of the body (thickness increase, addition of sheet brackets for providing extra support, ...) and increasing the weight of the vehicle due to this reinforcement

• In order to prevent deformation of the mechanism and guides, making them more resistant and as a result of this, weight increase and increase of the process costs.

Besides, in the known state of the art, since there is no adjustability on the door stoppers or there is limitation on the adjustability, the following problems occur:

• It does not meet the expectations of the customer requesting the product.

· Since the opening and closing efforts move in a connected manner with each other, the inclusion of the opening and closing efforts within the customer expectations takes long time.

• Due to the production tolerances, the dimensions of some pieces cannot be adjusted and these pieces lead to a scrap cost.

· It leads to inefficiency in production, and labor time extends.

• In order to sustain mass production, additional labor and/or additional equipment investment is/are needed.

• If 100% force control is not made in the production lines, the products, exiting the line, may lead to injuries of the automobile users.

As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a door stopper, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

The main object of the present invention is to provide a door stopper where the force needed for closing the sliding door is reduced and where opening of the sliding door with the desired level is provided. In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a door stopper comprising a dampening piston, a pin holder provided at the piston end of the piston shaft of the dampening piston, and a spring connected to the pin holder, in order to decelerate the sliding door during opening thereof in vehicles having sliding door and in order to reduce the hitting effect. Accordingly, the present invention comprises a first roller and a second roller connected to each other so as to rotate together in a coaxial manner, and a first rope connected to the pin holder from one end and connected to the first roller from the other end and a second rope connected to the spring from one end and connected to the second roller from the other end, and the first roller is greater than the second roller. Thus, when the spring is selected to be strong in a manner bringing the door to the open position, the force, to be exerted by the user to the spring for closing the door, is brought to ergonomic values.

In a preferred embodiment of the subject matter invention, there is a spring chamber wherein the spring is positioned.

In a preferred embodiment of the subject matter invention, the spring chamber comprises at least one chamber wall whereon an end of the spring is stopped. In a preferred embodiment of the subject matter invention, there is at least one spring guide which passes through the spring and through the gap provided on the chamber wall and which extends towards the second roller.

In a preferred embodiment of the subject matter invention, the spring guide comprises a guide head whereon an end of the spring is stopped.

In a preferred embodiment of the subject matter invention, the second rope is connected from one end thereof and the second roller is connected from the other end thereof to the end of the spring guide existing outside of the spring chamber.

In a preferred embodiment of the subject matter invention, the spring chamber comprises a cover which exerts pressure on the spring guide.

In a preferred embodiment of the subject matter invention, at least one holder guide pin is provided on the pin holder, and a holder movement channel, wherein the guide pin is at least partially placed, is provided on a body of the door stopper. In a preferred embodiment of the subject matter invention, the holder movement channel extends in the extension direction of the piston shaft.

In a preferred embodiment of the subject matter invention, there is a curved part provided at the end of the holder movement channel which is close to the dampening piston.

In a preferred embodiment of the subject matter invention, there is a second holder guide pin entering into the curved part when the pin holder is substantially approached to the dampening piston.

In a preferred embodiment of the subject matter invention, the pin holder comprises at least one holder guide channel wherein the piston end of the dampening piston is placed.

In a preferred embodiment of the subject matter invention, the holder guide channel is provided in a curved form.

In a preferred embodiment of the subject matter invention, the second roller is provided in a circular form. In a preferred embodiment of the subject matter invention, the second roller is provided in a cam form.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 a is a representative isometric view of the subject matter door stopper.

Figure 1 b is a representative detailed view of the subject matter door stopper.

Figure 2a is a representative detailed view of the subject matter door stopper while the sliding door is in closed position.

Figure 2b is a representative detailed view of the subject matter door stopper in passage position while the sliding door is being opened. Figure 2c is a representative detailed view of the subject matter door stopper while the sliding door is in open position. Figure 3a is a representative detailed view of an alternative embodiment of the subject matter door stopper while the sliding door is in closed position.

Figure 3b is a representative detailed view of an alternative embodiment of the subject matter door stopper while the sliding door is being opened.

Figure 3c is a representative detailed view of an alternative embodiment of the subject matter door stopper while the sliding door is in open position. REFERENCE NUMBERS

10 Door stopper

20 Body

21 Holder movement channel

22 Curved part

30 Dampening piston

31 Piston shaft

32 Piston end

40 Pin holder

41 Door pin housing

42 Holder guide channel

43 Holder guide pin

50 Spring chamber

51 Chamber wall

52 Gap

53 Cover

54 Spring guide

55 Guide head

56 Spring

60 First roller

61 First rope

70 Second roller

71 Second rope a Center axis

R1 First roller radius

R2 Second roller radius THE DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter door stopper (10) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

The subject matter door stopper (10) essentially has a body (20), a dampening piston (30) positioned inside said body (20), and a pin holder (40) which can catch a door pin positioned at the piston shaft (31 ) end of the dampening piston (30) and provided on the sliding door. As can be seen in Figure 1 , the dampening piston (30) is fixed inside the body (20). There is a pin holder (40) provided in a piston end (32) of the piston shaft (31 ) extending outwardly through the dampening piston (30). The piston end (32) is positioned inside a holder guide channel (42) provided on the pin holder (40). The holder guide channel (42) is preferably provided in a curved form. There are two holder guide pins (43) provided on the pin holder (40). The holder guide pin (43) is placed to a holder movement channel (21 ) provided on the body (20). Thus, while piston shaft (31 ) enters into and exits the dampening piston (30), the pin holder (40) moves in the direction of the holder movement channel (21 ). Since the holder movement channel (21 ) has a curved part (22) provided in a curved form at an end thereof and since the piston end (32) is positioned in the holder guide channel (32), when one of the holder guide pins (43) reaches the curved part (22) of the holder movement channel (21 ), the pin holder (40) can make a rotational movement at the other holder guide pin (43) axis. A door pin housing (41 ) is provided in recess form on the pin holder (40). During the opening and closing of the sliding door, the door pin can enter into and exit the pin housing (41 ). Thanks to said rotation freedom of the pin holder (40), the entering and exiting of the door pin into the pin housing (41 ) are facilitated.

There is a first roller (60) and a second roller (70) provided on the body (20). The first roller (60) and the second roller (70) are connected to the body (20) in a concentric manner and in a manner having rotation freedom at the center axis (a). The first roller (60) and the second roller (70) are connected to each other in a manner rotating together. Moreover, the first roller (60) is greater than the second roller (70). There is a first rope (61 ) connected to the first roller (60) from one end and connected to the pin holder (40) from the other end. The first rope (61 ) partially wraps onto the first roller (60).

There is a spring (56) provided on the body (20). The spring (56) is positioned inside a spring chamber (50). The spring (56) stops onto a chamber wall (51 ) of the spring chamber (50) from one side. The spring (56) stops onto a guide head (55) of a spring guide (54) which passes through the spring (56) from the other side and which extends towards the chamber wall (51 ). In other words, there is a spring guide (54) positioned inside the spring chamber (50), and the spring guide (54) extends through the spring (56) stopped onto the guide head (55) of the spring guide (54) from one end and stopped onto the chamber wall (51 ) from the other side. One end of the spring guide (54) passes through a gap (52) provided on the chamber wall (51 ) and it extends outwardly. The other end of the spring chamber (50) is closed by a cover (53). At the same time, the cover (53) is in contact with the spring guide (54), and thus, the first position of the spring guide (54) is determined by means of the cover (53). In other words, the cover (53) presses the spring guide (54) at a predetermined amount and it provides a pre-loading to the spring (56). There is a second rope (71 ) connected to the spring guide (54) from one end and connected to the second roller (70) from the other end. The second rope (71 ) is at least partially wrapped onto the second roller (70). The second rope (71 ) is connected to the spring guide (54) from the end of the spring guide (54) extending outwards the spring chamber (50).

In a possible embodiment of the present invention, the first roller (60) and the second roller (70) are provided in circular form and in a concentric manner. In Figure 2a, the view of the subject matter door holder (10) in the closed position of the door is given. In this position, the door does not contact the door holder (10). Moreover, in this position, since one of the holder guide pins (43) is provided at the curved part (22) of the holder movement channel (21 ), the door pin housing (41 ) is stopped in a manner facing the coming direction of the door. While the user opens the door, when the end of the door opening action is reached, the door pin, provided on the door, is placed to the door pin housing (41 ) provided on the pin holder (40). The door begins pushing the pin holder (40) by means of the speed thereof resulting from the door movement, and it provides the piston shaft (31 ) to be drawn outwards the dampening piston (30). Thus, the kinetic energy, stored on the door, is absorbed by the shock dampening piston (30), and the speed of the door is reduced. During this movement, the first roller (60) and the second roller (70) rotate by means of the spring force of the spring (56). By means of this, while the second rope (71 ) wrapped on the second roller (70) is being unwrapped, the first rope (61 ) is wrapped onto the first roller (60). Before the door reaches the completely open position, when the speed of the door approaches a value which is insufficiently low in a manner that the door does not reach a completely open position, the pin holder (40) continues to be drawn by means of the spring force. Thus, the door continues its opening movement, and the door reaches the door open position illustrated in Figure 2c from the passage position given in Figure 2b. When the door reaches the open position, thanks to the drawing force exerted on the pin holder (40) by the spring (56), the door continues to stay open. When the door is desired to be closed, by means of the force exerted by the user, the spring force is overcome, and the pin holder (40) is pushed towards the dampening piston (30). When the pin holder (40) sufficiently approaches the dampening piston (30), one of the holder guide pins (43) enters into the curved part (22) of the holder movement channel (21 ). By means of this, the pin holder (40) slightly rotates, and the door pin exits the door pin housing (41 ). During the movement of the pin holder (40) towards the dampening piston (30), the spring (56) is compressed, and the spring (56) is loaded with energy for being used during the next opening. By means of the placement of the holder guide pin (43) to the curved part (22), the pin holder (40) is mechanically locked, and thus, it waits in a ready-to-use manner by means of the energy loaded on the spring (56).

In said embodiment, in order to bring the door to the open position, the spring force shall be sufficiently great. However, if the spring force is great, the amount of energy to be consumed for loading the spring (56) while the door is being closed is greater.

In more details;

The radius of the first roller (60) is defined as R1 ,

The radius of the second roller (70) is defined as R2,

The force exerted by the user while the door is being closed and transferred to the first roller (60) by the first rope (61 ) by means of the pin holder (40) is defined as F1 ,

The force exerted by the spring (56) and by the second rope (71 ) to the second roller (70) is defined as F2. Accordingly, in order to load the spring (56) by means of closing the door,

F1 ^* R1 shall be greater than F2 ^* R2. Thus, if the R1 /R2 proportion is greater, a smaller F1 force is needed. By means of this, when the spring (56) is selected to be strong in a manner bringing the door to the open position, the force, exerted to the spring (56) by the user for closing the door, is brought to ergonomic values.

On the other hand, in case the first roller (60) and the second roller (70) are in the same dimension, during loading of the spring (56), the displacement amount of the pin holder (40) and the change amount to occur in the length of the spring (56) are equal. However, in case the first roller (60) is greater than the second roller (70), the change which has to occur in the length of the spring (56) depending on the radiuses of the roller is reduced. By means of this, the change of the force to be exerted during loading of the spring (56) is reduced. This provides the sliding door to be drawn by the spring (56) even at specific surface inclination values. The operation of the sliding door at inclined surfaces is only needed in the automotive sector. Moreover, the radius difference between the first roller (60) and the second roller (70) provides loading of the spring (56) with a shorter length change. In another embodiment of the present invention illustrated in Figure 3a, 3b and 3c, the first roller (60) is provided in a circular form, and the second roller (70) is provided in a cam form. Accordingly, the diameter of the second roller (70) is provided to be variable. By means of this, R1/R2 proportion changes depending on the position of the pin holder (40) and depending on the rotation amount of the first roller (60) and the second roller (70). In Figure 3a, in the closed position of the door, the R2 value is the lowest. While the door is being opened, and as the pin holder (40) displaces, R2 increases. Thus, the effect of the spring force increases, and the passage of the door to the open position is facilitated. By means of this, the opening of the door can be provided by means of a lower-resistance spring (56). Moreover, depending on the operational character of the springs (56), the effect of the decrease, occurring in spring force, on the door movement is eliminated.

The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.