Seat supporting assembly of the resiliently loaded type

Claim 2

A seat supporting assembly comprising a lower base member, an upper seat platform for supporting a seat, linkage means connected between said base and said platform for vertically positioning the platform relative to the base, a spring mounted on the base and extending upwardly therefrom, a spring loaded mechanism mounted on the upper end of said spring and pivotally secured to said upper seat platform, mechanism for adjusting said spring loaded mechanism to raise and lower said platform relative to said base, an upstop limit for limiting the upward movement of said platform, said adjusting mechanism also having an actuator for selectively operating said up-stop limit or said adjusting mechanism.

Claim 3

The assembly set forth in claim 1 further characterized in that said spring load mechanism includes a pair of arms pivotally mounted at their lower ends and adjacent the upper end of said spring, the upper ends of said arms being swingable toward and away from one another, and said adjusting mechanism includes a screw having a pair of relatively movable slide blocks mounted thereon, said slide blocks being pivotally connected to the upper ends of said arms, whereby rotation of the screw causes movement of said slide blocks toward and away from one another and raising and lowering of said platform, respectively.

Claim 4

The assembly set forth in claim 2 further characterized in that said up-stop limit includes a transverse beam and said adjusting mechanism includes a threaded member threadably engaged with said beam for positioning said beam in a fore and aft direction, said linkage means being abuttable against said transverse beam.

Claim 5

The assembly set forth in claim 1 further characterized in that said up-stop limit includes a transverse beam and said adjusting mechanism includes a threaded member threadably engaged with said beam for positioning said beam in a fore and aft direction, said linkage means being abuttable against said transverse beam.

Claim 6

The assembly set forth in claim 2 further characterized in that said screw is rotatably mounted on said platform, and said actuator is an adjustable knob detachably connected to said screw for rotating the latter.

Claim 7

The assembly set forth in claim 3 further characterized in that said screw is rotatably mounted on said platform, and said actuator is an adjustable knob detachably connected to said screw for rotating the latter.

Claim 8

The assembly set forth in claim 6 further characterized in that said knob has a detachable connection with said threaded member for rotating the latter to adjust said limit means

Claim 9

A seat supporting assembly comprising a lower base member, an upper seat platform for supporting a seat, linkage means pivotally connected between said base and said platform for vertically positioning the platform relative to the base, a spring mounted on the base and extending upwardly therefrom and having an upper end, a spring loaded mechanism mounted on the upper end of said spring and pivotally secured to said upper seat platform, said spring loaded mechanism including a platform secured to said upper end of said spring, a pair of arms having lower ends pivotally connected with said upper end of said spring, said arms having interengaging gear teeth at their lower ends for equalizing movement between said arms, said arms having upper ends swingable toward and away from one another, adjusting mechanism including a screw having a pair of relatively movable slide blocks mounted thereon, said slide blocks being pivotally connected to said upper ends of said arms, whereby rotation of the screw causes movement of said slide blocks toward and away from one another and raising and lowering of said platform, respectively, an up-stop limit for limiting the upward movement of said platform, said adjusting mechanism also having an actuator for selectively operating said up-stop limit or said adjusting mechanism.

Claim 10

A seat supporting assembly comprising a lower base member, an upper seat platform for supporting a seat, linkage means pivotally connected between said base and said platform for vertically positioning the platform relative to the base, a spring mounted on the base and extending upwardly therefrom and having an upper end, a spring loaded mechanism mounted on the upper end of said spring and pivotally secured to said upper seat platform, said spring loaded mechanism including a platform secured to said upper end of said spring, a pair of arms having lower ends pivotally connected with said upper end of said spring, said arms having interengaging gear teeth at their lower ends for equalizing movement between said arms, said arms having upper ends swingable toward and away from one another, adjusting mechanism including a screw having a pair of relatively movable slide blocks mounted thereon, said slide blocks being pivotally connected to said upper ends of said arms, whereby rotation of the screw causes movement of said slide blocks toward and away from one another and raising and lowering of said platform, respectively, an up-stop limit for limiting the upward movement of said platform, said adjusting mechanism also having an actuator for selectively operating said up-stop limit or said adjusting mechanism.

Claim 11

The assembly set forth in claim 8 further characterized in that said up-stop limit includes a shiftable transverse beam and said adjusting mechanism includes a threaded member threadably engaged with said beam for positioning said beam in a fore and aft direction, said linkage means being abuttable against said transverse beam.

Claim 12

The assembly set forth in claim 8 further characterized in that said screw is rotatably mounted on said platform, and said actuator is an adjustable knob detachably connected to said screw for rotating the latter.