Leg adjuster for a work support
View Patent ↗Apparatus for adjusting the longitudinal and angular position of a work surface support leg. The leg passes through a channel in a cap held via a spring and pin to a base affixed to the work surface. The leg's angular position is adjusted by rotating the cap, which moves a tooth through a series of mating depressions. The longitudinal position is adjusted by moving the leg which has a series of notches that mate with a locking tooth in the cap. A knob interfaces with the cap via a rotary cam having high and low steps and a matching cam rider. The low step allows separation between the cap and base and the high step locks the cap to the base, thereby locking in the adjustment setting for the leg.
1. Apparatus for adjusting the longitudinal and angular leg position for a work support comprising a platform supported by one or more legs, the apparatus comprising:
a base attached to the platform, a rotating cap, an elongated leg, a spring biasing the cap against the base, and an axle pin rotatably extending through the base and cap wherein:
the cap and base meet at a substantially planar base interface having an arcuate series of depressions on one of the cap and base, and at least one mating tooth on the other one of the cap and base, the arc being concentric with an axis of rotation defined by the axle pin;
the leg passes through a channel in the cap, the channel being open to the base interface and having a locking tooth therein that mates with any one of a series of longitudinally spaced apart notches in the leg when the base interface is mated tooth-in-depression;
a manual locking knob is rotatably mounted on the axle pin, meeting the cap at a cam interface axially opposite the cap's base interface, with the knob being spring biased away from the cap and against a head end of the axle pin;
the cam interface comprises high and low cam steps on one of the knob and the cap, and a cam rider on the other one of the knob and the cap; and
when manually rotated, the knob is restricted to moving the cam rider between the high and low cam steps, the low step allowing separation between the cap and the base for adjustment of the leg position; and the high step locking the cap against the base such that the base interface is mated tooth-in-depression, thereby locking the leg in position after adjustment.
2. The apparatus of claim 1 , further comprising:
an end stop protruding laterally from an end of the leg, dimensioned and positioned to stop the leg end from passing through the channel.