Abstract: A MacPherson strut spring compressor has a drive mechanism to move a strut clamp assembly toward and away from the front of the frame. Upper and lower positioning assemblies are vertically movable with respect to the frame to accommodate MacPherson struts of different sizes and spring offsets, with the upper positioning assembly being vertically adjustable independently of the lower positioning assembly and the lower positioning assembly being vertically adjustable with respect to frame. There is also disclosed locking mechanism for each of the positioning assemblies to retain the MacPherson strut in place during operation of the compressor.

Abstract: Control mechanism for a pneumatic hand tool which provides improved performance, speed regulation and control of the tool in air pressure ranges up to at least 116 pounds per square inch gauge (psig). A pneumatic hand tool embodying subject control mechanism includes a cylinder having an implement, such as a chisel, secured thereto and a reciprocating piston in the cylinder, the piston adapted to be driven by pressurized air into impact engagement with the front head of the cylinder, and returned to the rear cylinder end without impact. The control mechanism comprises an adjustable control valve which meters the volume of incoming pressurized air to that amount which produces desired tool operation, and an improved ball valve between the control valve and the cylinder. The control valve includes a radially movable spring-biased valve pin which cooperates with a valve seat, and a rotatable control ring in effective relation with the valve pin.