Vehicle seat
First Claim
1. A spring loaded vehicle seat including a seat frame for supporting a seat cushion, an underframe, levers arranged on the seat frame, a pneumatic spring, the seat frame being supported on the underframe by the levers and the pneumatic spring, a selected static height of the seat being automatically maintained constant independent of the weight of the occupant of the seat at any one time, a compressed air blow-off valve for decreasing the internal working pressure of the pneumatic spring in positions of the seat above the static height during vibrations, a compressed air supply valve for increasing the internal working pressure of the springs in positions of the seat below the static height, a switch mechanism for opening and closing the valves, and a coupling device coupled to transmit vibrational movement of the seat to the switch mechanism, wherein the switch mechanism is fixed in its respective end position after the opening of a valve and the coupling device includes a lagging segment x so that movement of the switch mechanism after the opening of a valve lags behind the vibrational movement by the extent of the lagging segment x.
1 Assignment
0 Petitions
Accused Products
Abstract
A spring loaded vehicle seat is of the kind having a seat frame and an underframe supports this seat frame by levers and a pneumatic spring so that the seat is maintained at a constant height. Valves control the flow of air to and from the spring to counteract the effect of vibrations. A switch mechanism controls the operation of the valves and a coupling device transmits vibrations of the seat to the mechanism. The coupling device is arranged so that movement of the mechanism after opening a valve lags behind the vibration of the seat.
44 Citations
10 Claims
- 1. A spring loaded vehicle seat including a seat frame for supporting a seat cushion, an underframe, levers arranged on the seat frame, a pneumatic spring, the seat frame being supported on the underframe by the levers and the pneumatic spring, a selected static height of the seat being automatically maintained constant independent of the weight of the occupant of the seat at any one time, a compressed air blow-off valve for decreasing the internal working pressure of the pneumatic spring in positions of the seat above the static height during vibrations, a compressed air supply valve for increasing the internal working pressure of the springs in positions of the seat below the static height, a switch mechanism for opening and closing the valves, and a coupling device coupled to transmit vibrational movement of the seat to the switch mechanism, wherein the switch mechanism is fixed in its respective end position after the opening of a valve and the coupling device includes a lagging segment x so that movement of the switch mechanism after the opening of a valve lags behind the vibrational movement by the extent of the lagging segment x.
Specification