Modular Shoring Assembly with Length Adjustable Support

A length-adjustable support, the support having a first elongate member, a second elongate member, and a third elongate member, each for telescopic sliding engagement with the other said members, the said members being movable relative to each other from a collapsed position to an extended position with one of said members providing a first slot therein in a longitudinal direction thereof that is in communication with a second slot therein transversely disposed thereto, and with another of said members providing a third slot therein, and with another of said members providing a fourth slot therein in a longitudinal direction thereof that is in communication with a fifth slot therein transversely disposed thereto and in communication therewith and also providing a sixth slot therein, such that the third slot is in registry with the fifth slot when the second and third members are in telescopic sliding engagement and in the said extended position, and the second slot is in registry with the sixth slot when the first and third members are in telescopic sliding engagement and in the said extended position, the support having a pin locatable within the said first and second slots and within the said sixth slot for relative movement with the first and third members, wherein locating of the pin within the second and sixth slots and outside of the first slot maintains the first and third members in the said extended position thereof and locating of the pin within the first slot enables the first and third members to move from said extended position to said collapsed position, the support also having a pin locatable within the said fourth and fifth slots and within the said third slot for relative movement with the third and second members, wherein locating of the pin within the third and fifth slots and outside of the fourth slot maintains the third and second members in the said extended position thereof and locating of the pin within the fourth slot enables the third and second members to move from said extended position to said collapsed position.