DE29811760U1 - The renewal of the weight adjustment devices for the driver's seats - Google Patents

Description

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DESCRIPTION THE RENEWAL OF THE WEIGHT ADJUSTMENT DEVICES FOR THE DRIVER SEATS

This invention is generally a mechanism used on driver seats and is used to adjust the seat suspension according to the driver's body weight.

Today there is a German patent from GRAMMER AG, with the number DE 30 00 433 C 2, for this operation. In this patent, the driver's seat suspension is controlled by turning a lever on the edge of the seat backrest. The seat part is connected to the backrest. The seat part moves at the same time as the backrest moves. One of the most important parts of this patent is the adjustment device on the backrest. This adjustment device is, as mentioned above, operated by a lever on the edge of the seat. By turning this lever, a protrusion on the end of the lever is also rotated at certain angles. This changes the tension of a spring behind the seat and thus also the amount of movement of the seat part against the weight. This means that the seat suspension can be adjusted according to the weight.

The biggest disadvantage and therefore the most common problem of the above-mentioned system is the adjustment of the system. When adjusting the system, the lever must be turned. When sitting, turning the lever is very difficult for the driver. When turning the lever, he must first counteract his own force and torque, especially his weight, and then the spring force. In order to counteract this force and torque, his hand force must be very high or the turning lever must be too long. Just as a high hand force is not always possible for every operator or driver, a long turning lever (adjustment lever) is not possible because it is aesthetically unsightly. When using this system, the need for high turning force and the unfavorable ergonomic position for operation are important disadvantages.

In addition to this device, there are also other adjustment mechanisms for today's driver seats. With these mechanisms, the adjustment is not carried out by turning a lever, but for example by pressing a lever. However, the internal mechanisms of driver seats with such mechanisms are very complicated. Therefore, the production of such seats is very difficult and the production costs are high.

The seat adjustment device according to weight is easy to use with this newly invented system. The driver only presses a pressure lever down when he wants to make an adjustment according to his weight. This does not require a high force or a high torque. The driver uses his own weight when applying force downwards. The staggered notches behind the seat ensure this possibility. When adjusting, the operator only presses the pressure lever down. The adjustment can be increased or decreased as desired. To return to the starting position, one only needs to press the lever all the way down. In addition, this system ensures ergonomic use for the operator.

The invented system ensures not only adjustment with very little force, but also a better aesthetic appearance. To ensure ease of use and beauty of appearance, there is no complicated construction in the device. The simplicity even ensures a reduction in production work and thus also in the cost price.

The invented system can be better understood with the help of the pictures below. That is;

Figure 1- Seat adjustment device on the driver's seat and side view

Figure 2- Weight regulation system of the device on the seat back

Figure 3- Regulation level 1 of the weight regulation system

Figure 4- Regulation level 2 of the weight regulation system

Figure 5- Regulation level 3 of the weight regulation system

Figure 6- Initial position of the weight regulation system

Figure 7- Adjustment pressure lever

Figure 8- Adjustment plate with notches

Figure 9- Locking latch

The above mentioned mechanism consists of the following parts:
1- Driver seat backrest

2- Movable backrest of the driver's seat

3- Connection of the driver's seat to the movable backrest

4- Tension spring for the movable backrest to return

5- Weight adjustment lever for the driver's seat 5a- Pressure plastic for adjustment lever 5b- Notch for the spring of the adjustment lever

6- Pin for the notch

7- Pressure lever (5) and tension spring for the movable backrest (2)

8- Adjustment plate with notches 8a- Plate joint 8b- Spring retaining hole 8c- Pressure projection 8d- 1st notch 8e- 2nd notch 8f- 3rd notch

8g- notch bridges 8h- adjustment tooth plate

9- Locking latch 9a- Latch holder 9b- Spring retaining hole 9c- Latch extension

10- Plate holder tension spring

11- Tension spring for the adjustment plate

12- Pressure pin

13- Pressure lever joint

The structure of the weight regulation device and its mode of operation is as follows: The driver's seat is connected to the movable backrest (2) with a joint system (3). The main thing here is that the driver's body weight sets the extent of movement by regulating the extension of the tension spring (7). This means: if the driver's body weight is high, the tension spring (7) must be extended and vice versa, if the body weight is low, the tension spring (7) must be extended even less.

The device contains a weight adjustment lever (5) connected to the fixed backrest (1) by a joint (13). This lever (5) rotates around the joint (13) at certain angles. By pressing the pressure plastic (5a) of the weight adjustment lever (5) downwards (direction A) with your hand, the end of the lever (5) on the side of the tension spring (7) moves upwards (direction C) and the spring (7) extends. If you sit on the driver's seat in this position, the downward extension of the spring is limited. If the driver's body weight is too high, even more pressure is exerted on the lever (5) and the tension spring (7) is extended even further. In this case, excessive extension of the tension spring (7) is prevented. This means that the movable backrest (2) does not move downwards excessively due to a high load. Since the driver's seat is connected to the movable backrest (2) with a joint system, the driver's seat does not move excessively downwards. This allows for weight control.

The most important feature of this device is the use of a notched adjustment plate (8) that changes the position of the weight adjustment lever (5) according to the load. This notched adjustment plate (8) is connected to the fixed backrest (1) with a plate joint (8a) and makes circular movements. A tension spring (11) is connected to the adjustment plate (8) through the spring retaining hole (8b) and this tension spring (11) rotates the plate (8) in a circular motion in direction (E). When the weight adjustment lever (5) is normally in the upper position, i.e. when there is no pressure on the lever (5), the pin (6) on the lever (5) is in the 1st notch (8d). This position can be seen better in Figure 3.

If the body weight of the man on the seat is too high, weight regulation must be carried out. In this case, the weight regulation lever (5) is manually

pressed. With this pressure, the pin (6) exerts pressure on the notched bridge (8g) and turns the adjustment plate (8) in direction (F), so that the pin goes over the notched bridge (8g) into the

2nd notch (8c). This is where the second adjustment is made. This position can be seen better in Figure 4.

If a higher level of weight control is required, i.e. if the body weight is much too high, the weight control lever (5) is pressed down again. With this force, the pin (6) comes out of the 2nd notch (8e) and goes into the

3. Notch (8f) in. This position can be seen better in picture 5.

Since the diameters of the three notches (8d, 8e, 8f) are larger than the diameter of the pin (6), a good fit is guaranteed. To make it easier for the pin (6) to slide over the notch bridges (8g), the notch bridges (8g) are designed at an angle. With each slide, the adjustment plate (8) moves a little in direction (F) and returns again when the pin (6) is in a notch (8d, 8e, 8f). With each step increase (1, 2, 3) of the pin (6), the spring (7) lengthens even more.

If the body weight of the man in the driver's seat is low, the preload of the spring (7) must also be low, i.e. the weight adjustment lever (5) must be unpressed at the upper point. While the lever (5) is at the lowest point and the pin (6) is in the 3rd notch (8f), the pressure plastic (5a) must be pressed down to bring the pin (6) to the upper point (8d). As can be seen in Figure 6, the pressure pin (12) on the lever (5) exerts pressure on the pressure projection (8c) on the adjustment plate (8). This force causes the adjustment plate (8) to rotate in direction (F). This rotation of the adjustment plate (8) causes the pin (6) to come out of the 3rd notch (8f). At the same time, the end of the adjustment plate (8h) goes into the pawl holder 9a) of the locking pawl (9). This prevents the adjustment plate from rotating in direction (F). The pin (6) comes out of the notch (8f) and remains free. The lever (5) also moves under spring force (7) in direction (B) until the pin (6) touches the locking pawl (9). This contact of the pin (6) with the locking pawl (9) renews the spring force that ensures that the locking pawl (9) touches the end of the adjustment plate and the locking pawl moves in direction (G). The adjustment plate (8) remains free and rotates in direction (E). This prevents the pin (6) from engaging in the notches (8a, 8b, 8c). The weight adjustment lever comes to

this way to the starting position.

The driver seats with adjustment device can be used with all driver seats and also with all seats for other purposes.

Claims (11)

Protection claims L. Device for use on driver's seats to adjust the seat suspension according to the driver's body weight, with a weight adjustment lever (5) which is connected to the fixed backrest (1) of the driver's seat by means of a joint piece (13), the lever (5) being rotatable about the joint (13) by pressing down (arrow A) a pressure plastic (5a) by hand, and at the other end of the lever (5) a tension spring (7) being provided which is movable and extendable upwards (arrow C), and a pin (6) being provided on the lever (5) which engages in notches (8d, 8e, 8f) on the adjustment plate (8) in order to ensure that these movements are carried out in stages. 2. Device according to claim 1, characterized in that the adjustment plate (8) is connected to the fixed backrest (1) and is pivotally mounted, that a tension spring (11) is arranged on the adjustment plate (8) through a spring retaining hole and the spring (11) urges the plate (8) in the direction (arrow E), wherein circular notches (8d, 8e, 8f) are provided on the plate (8) and the notches (8d, 8e, 8f) have an oblique construction, and the plate (8) has an L-shape in the notch area (8d, 8e, 8f). I. Device according to claim 1, characterized in that a pressure piece (5a) is provided on the adjusting lever to facilitate the application of pressure, that this pressure piece is preferably made of plastic, that a pin (6) with a smaller diameter for locking in the notches (8d, 8e, 8f) and another pin with approximately the same diameter as the pin (6) are provided on the lever, and that a notch (5b) for attaching the spring (7) is provided at the other end of the lever. 4. Device according to one of the preceding claims, characterized in that the fixed pin (6) is located in the first notch (8d) on the lever (5) when the lever (5) is in the upper position and no pressure is applied to the lever (5), whereby the spring (7) can be tensioned by applying pressure to the lever (5) and the pin (6) locks into the notch (8d). C 5. Device according to one of the preceding claims, characterized in that if the load is too high, the lever (5) can be pressed by hand from above in the direction (arrow A), and this pressure exerts pressure on the notched bridge (8g) of the pin (6), and the adjustment plate (8) can be rotated in the direction (arrow F) and the pin (6) can be locked into the second notch via the notched bridge (8g). 6. Device according to claim 1 and 5, characterized in that the adjusting lever (5) can be pressed downwards again (arrow A) if the weight is too high, whereby the pin (6) can be moved out of the second notch (8e) and into the third notch (8f) by this force. 7. Device according to claim 1, characterized in that at the level of the adjustment plate (8h) there is a locking pawl (9) which is fixed behind the seat by means of a joint system and allows a circular movement, that on one side of this pawl (9) there is a spring (10) which urges the pawl (9) in the direction (arrow H), and this spring (10) is located in the spring retaining hole (9b) of the locking pawl and at the other end of the pawl (9) there is also a support (9a) and an extension (9c). 8. Device according to claim 1, 6 and 7, characterized in that the pressure plastic (5a) can be pressed further downwards when the lever (5) is in the lowest position, that is to say when the pin (6) is in the third notch, whereby the pin (6) can be brought into the uppermost position, that the pressure pin (12) on the lever (5) touches the pressure projection (8c) on the adjustment plate (8) and presses on it, whereby this pressure force pushes the adjustment plate (8) in the direction (arrow F) is rotatable and the pin (6) located in the third notch can be moved out of the notch. 9. Device according to claim 1 and 8, characterized in that when the pin (6) is transferred from the third notch (8f) to the first notch (8d), the end of the adjustment plate (8h) enters the pawl holder (9a) of the locking pawl (9), and in this position the rotation of the adjustment plate (8) in the direction (arrow E) is blocked and the pin (6) comes out of the notch (8f) and is free. 10. Device according to claim 1 and 8, characterized in that the adjusting lever (5) is movable until the pin (6) comes to the locking pawl (9) in the direction (B) by the spring force (7), that the spring force (10) can be overcome by the contact of the pin (6) with the locking pawl (9), that the locking pawl is movable in the direction (arrow G), and then the adjusting plate remains free and rotates in the direction (arrow E), whereby the locking of the pin (6) in the notches (8a, 8b, 8c) is prevented and the lever (5) returns to its starting position. 11. Device according to one of the preceding claims, characterized in that the weight adjustment by pressing the pressure plastic of the lever (5) is feasible, whereby a little pressure on the pressure plastic is sufficient for the lowest weight level.