Patent ID: 6964542

Claim:
A shoring device, said shoring device comprising: (A) a piston and a cylinder, said cylinder partially enclosing said piston, said piston and said cylinder each comprising an interior wall, said cylinder having a longitudinal axis and said piston having a longitudinal axis, said piston and said cylinder each comprising a distal end and a proximal end, said piston and said cylinder each comprising an exterior wall, each said piston and cylinder comprising an interior wall and a pre-determined wall thickness, (B) at least one straight metal cam pin, and (C) a mechanical device, said mechanical device encircling said piston and said cylinder, said mechanical device comprising in combination, (1) an outer cam collar, said outer cam collar comprising an abutting element, said abutting element penetrating said outer cam collar, said outer cam collar movably positioned along said longitudinal axis of said piston, said outer cam collar engaging said cylinder and said piston, (2) an inner ring, said inner ring attached to and encircling said cylinder, said inner ring comprising an inner ring circumference, said inner ring comprising a continuous circular indentation along said inner ring circumference, said continuous circular indentation comprising an indentation floor, said continuous circular indentation comprising a depth and a width, said outer cam collar concentrically enclosing said inner ring, whereby said abutting element prevents rotational movement of said cylinder relative to said piston by tightly abutting said indentation floor.