Patent ID: 8100776

Claim:
A play apparatus comprising: a support frame adapted to rest on a floor; a seat; a beam member pivotally coupled to the support frame at a pivot, the seat disposed at a first end of the beam member; a spring coupled between the beam member and the support frame; a manually operated adjustment member comprising a first adjustment screw for adjusting a coupling position of the spring on the beam member toward or away from the pivot, wherein the adjustment member is constrained against displacement from the beam member at all times, including during adjustment, whereby the spring remains engaged between the beam member and the support frame at all times; a second adjustment screw disposed between an end of the spring and one of the beam member and support frame; a knob attached to the second adjustment screw, whereby the end of the spring moves toward or away from the beam member or support frame and thereby adjusts a rest height of the seat in response to manual rotation of the knob.