Vehicle seat, in particular utility vehicle seat
A vehicle seat has a scissor-type stand vibratable and adjustable in height, with a pneumatic spring and cranks intersecting at a scissor shaft, and a control device for level control and height adjustment of the stand. The control device has a driver, a switching element coupled with the driver, and a valve device controlled by the switching element, for controlling the pneumatic spring. The driver and the valve device are kinematically assigned to different parts of the stand, such parts being movable relative to one another. The switching element is spaced from the shaft and rotatably supported on the first crank. The valve device is connected with the first crank, and the driver is configured as a Bowden cable, the core of which is coupled with the switching element, and the jacket of which is fixedly connected with the second crank.
1. A utility vehicle seat, comprising:
a) a scissor-type stand, which is able to vibrate and which can be adjusted in terms of height, with a pneumatic spring and at least first and second cranks, which intersect at a scissor shaft; and
b) a control device for level control and for height adjustment of the scissor-type stand, the control device comprising a driver, a switching element coupled with the driver, and a valve device which is controllable by the switching element to control the pneumatic spring, wherein the driver and the valve device are kinematically assigned to different parts of the scissor-type stand, the different parts being movable relative to one another;
wherein the switching element is spaced apart from the scissor shaft and rotatably supported on the first crank;
wherein the valve device is fixedly connected with the first cranky;
wherein the driver is configured as a Bowden cable having a core coupled with the switching element, and a jacket fixedly connected with the second crank; and
wherein the switching element has at least one control cam which controls the valve device in the event of a rotation of the switching element, and the at least one control cam, in the event of the rotation of the switching element acts upon a control lever which is pivotally articulated on the valve device or on a base of the control device.
2. The utility vehicle seat according to claim 1 , wherein the base of the control device is fixed to the first crank, and wherein the valve device is fixed to and/or the switching element is rotatably mounted on the base.
3. The utility vehicle seat according to claim 1 , wherein the control lever, due to its being acted upon, acts upon a tappet of a valve of the valve device.
4. The utility vehicle seat according to claim 1 , wherein a reset spring is effective between the switching element and at least indirectly the first crank to maintain the core of the driver tight relative to the jacket.
5. The utility vehicle seat according to claim 1 , wherein for coupling the switching element with the core of the driver, the switching element is fixed to the core or coupled by driving with a free travel.
6. The utility vehicle seat according to claim 1 , comprising an actuating element which, in a non-actuated state, fixes the driver by holding the core relative to the jacket, and which, in the event of an actuation, displaces the core relative to the jacket.
7. The utility vehicle seat according to claim 1 , wherein the driver is deflected, at least with the core, on the scissor shaft.
8. The utility vehicle seat according to claim 7 , wherein the core of the driver is guided over a deflection pulley which is rotatably supported on the scissor shaft, and wherein the deflection pulley has approximately the same diameter as the switching element and/or comprises two parts clipped together.