Abstract: A system for securing a member, such as a shelf, to a vertical support column and holding the member in a desired position on the column includes a rotary sleeve system whose resistance to downward motion is directly proportional to the downward force applied. A conical frustum shaped collar having an integral pin extending inwardly from its inside surface rests on top of a split conical frustum shaped sleeve having configurations in the split to receive the pin in one of two positions, an unlocked position and a locked position. A horizontal portion of the slit may be provided for restricting downward motion of the collar with respect to the sleeve to maintain the split in an open configuration, allowing free movement of the rotary sleeve system up or down the vertical column.

Abstract: A carrier for self-supporting sheet-like articles such as printed circuit boards and the like comprises first and second frames and first and second spaced-apart panels supported by the frames. The panels are adapted to receive and support articles such as printed circuit boards, which can be inserted from the front of the carrier. The frames and the panels are connected in such a manner that the panels support the frames and provide front-to-back rigidity in the carrier, while the frames provide side-to-side rigidity.

Abstract: A utility cart has four corner posts, a handle having a pair of elongate legs and coupling plugs for positioning the distal ends of the handle legs in aligned proximate disposition relative to a pair of corner posts. Support members engage the exterior of the corner posts against axial movement relative thereto and interlock with the handle legs thus to secure the corner posts to the handle. The support members also serve to support a corner of a shelf to each of the four corner posts.

Abstract: A latch assembly, for holding an object such as a door in either of two positions, includes a catch mounted in fixed position at each of the positions. A latch is mounted on the object and includes two latch portions, each of which is formed to engage and be trapped by one of the catches upon movement of the object toward one of the positions. A first of the latch portions is manipulable from one side of the object to release the other of the latch portions from its associated catch. Similarly, the other latch portion is manipulable from the other side of the object to release the first portion from its associated catch.