Abstract: A torque limiting clutch includes a drive shaft having central rotational axis, a disk-shaped spring member secured to the drive shaft for rotation therewith, and a plate adjacent the spring member and having a plurality of grooves receiving bosses of the spring member. The spring member has a plurality bosses formed at an outer edge of the spring member that each form a generally V-shaped engagement surface. The grooves each form a generally V-shaped engagement surface engaging the bosses. A retaining clip retains the plate relative to the spring member to obtain a predetermined spring pretension. Engagement of the bosses with the grooves causes rotation of the plate upon rotation of the drive shaft when below a predetermined torque limit and deflection of the bosses out of the grooves prevents rotation of the plate upon rotation of the drive shaft when above the predetermine torque.

Abstract: A jack handle includes a handle arm having first and second ends, a jack driver having a coupling shaft, and a spring clip detachably securing the jack driver to the handle arm. The first end of the handle arm forms a socket receiving the coupling shaft. The spring clip has a protrusion resiliently deflectable between a locking position interlocking with the coupling shaft to secure the jack driver to the handle arm and a releasing position free of the coupling shaft such that the jack driver is released from the handle arm. Preferably, the spring clip encircles the periphery of the handle arm at the socket, the handle arm has an opening at the socket, and the protrusion of the clip extends through the opening and into the groove to interlock the jack driver with the handle arm.

Abstract: A pantograph jack includes a base, a load rest, first and second lower arms each pivotably coupled at a first end to the base, and first and second upper arms each pivotably coupled at a first end to the load rest. Second ends of the first lower and upper arms are pivotably coupled at a first joint. Second ends of the second lower and upper arms are pivotably coupled at a second joint. A screw extends between the joints and operably moves the joints toward and away from each other upon rotation of the screw to raise and lower the load rest. A bearing spacer includes a flange forming a bearing engagement surface at a first end and a second end engaging the second joint. The drive screw has an abutment facing the bearing engagement surface. A bearing is located between the bearing engagement surface and the abutment.