Tripod type jack assembly

Claim 1

In a tripod type jack adapted to elevate or depress a pipe assembly thereon, the combination comprising: a. a lower body member and an upper elevating member constituting hollow cylindrical members having a telescoping relation with respect to each other adapted to support a pipe assebly thereon; b. a spider-like member having a surrounding relation with respect to said body member; c. leg members pivotally attached to said spider-like member by gusset plates equally spaced around the periphery of said spider-like member, said legs being movable between extended and folded positions and functioning to maintain the jack in upright attitude at such time as they are in their extended position; d. said gusset plates having a camming groove provided therein; e. camming means comprising a hollow cylindrical collar having a surrounding and sliding relation on said body member, said collar having three equally spaced camming surfaces extending normal to the axis of said collar and positioned to be received in said camming grooves when said legs are in their folded position, thEreby forcing and maintaining said legs in their folded position in side-by-side relation with respect to said body member.