Patent ID: 6997152

Claim:
A lock-pin cartridge for incorporation into a variable valve activation assembly to latch and unlatch a first member thereof from a second member thereof, the cartridge comprising: a) a body disposable on said first member and having an axial bore having first and second ends, said first end having a closure, said second end being partially closed and having a passage therethrough; b) a piston assembly having a locking pin and a piston disposed in said bore, said locking pin extending through said second end passage to provide said latching and unlatching of said first and second members, said piston being spaced apart from said first and second ends to define a hydraulic chamber and a spring chamber within said bore on opposite sides of said piston; and c) biasing means disposed in said spring chamber between said partially closed second end and said piston for urging said piston assembly toward said first end.