Patent ID: 8356783

Claim:
A retractable stop assembly adapted for rigid attachment to an underside of a cart for sheet material, the retractable stop assembly comprising: a base plate member adapted for rigid attachment to an underside of a cart adjacent an edge thereof; a mounting bracket unit rotatably attached to the base plate member opposite the underside of the cart by a threaded fastener, the mounting bracket unit including first and second bracket plate members in register with the threaded fastener member penetrating the bracket plate members and the base plate member for rotatably securing the mounting bracket unit to the base plate member; a cylindrical sleeve member rigidly secured between the first and second bracket plate members with the cylindrical sleeve member's central axis parallel with the base plate member; and an L-shaped stop member with first and second leg sections, the first leg section movably positioned within the cylindrical sleeve member, and the second leg section movable to extend above the edge of the cart; whereby rotation of the threaded fastener member in a selected direction rigidly clamps the L-shaped stop member in a selected orientation within the cylindrical sleeve member.