Abstract: A playhouse composed of a sheet material is provided that utilizes plastic windows, doors, and fasteners to secure various sections together. The fastener engages a clip that is attached to various sections. The fastener is then twisted to secure the windows and doors to the structure as well as securing two sections together. The playhouse is disassembled for easy storage under a bed or in a closet. Additionally, the fasteners, windows, door, and clips can be re-used with additional corrugated structures or kits.

Abstract: An assembly of a bolt, a washer, a nut and locking structure for locking the bolt against rotation after the bolt, washer and nut have locked together a pair of flat, plate-like members in frictional engagement with each other. Any tendency for the bolt to rotate in a reverse direction will be prevented by the locking means. The plate members will essentially be bonded together against movement relative to each other, thereby maintaining structural integrity of the assembly. In a first embodiment, the head of the bolt has a notch for receiving one end of split ring washer. The other end of the washer is in a notch in the nut. The nut and washer define a locking unit for preventing reverse rotation of the bolt after the head of the bolt has been moved into proximity with the washer and the washer has been moved into the notch of the nut. Other embodiments are disclosed.

Abstract: This assembly comprises a collar (3) having splines cooperating with splines on the bolt (1) and lateral tabs (4) in contact with flat sides of the nut (2). This assembly further comprises at least one bent elastically yieldable locking element (5, 5') having a first branch (6, 6') trapped between a tab (4) of the collar (3) and a flat side of the nut, a second branch (8, 8') having an aperture (9, 9') through which extends the bolt and which has an edge engaged between screw threads of the bolt. By exerting a lateral pressure on the locking elements (5, 5'), the screw threads of the bolt are elastically disengaged.

Abstract: An economical alternative to throw away lock nuts is provided by a retainer that fits to or over a conventionally threaded nut. Splines on the shaft, and resilient fingers on the retainer, are mismatched in number by one, assuring that they interfit with at least one finger blocked by a spline, or closed to it, so that the nut cannot be turned significantly back. The retainer can be easily removed, so that both it and the nut may be reused.

Abstract: An electric cable sealing end in which the insulator which screws into a sealing box part and the box part distal end have rings therebetween with facing, complementary, engageable saw teeth. One ring is rotatable by the insulator and the other ring is held stationary by the box part. When the insulator is tightened, the saw teeth permit rotation thereof but after tightening, the saw teeth prevent rotation of the insulator in the loosening direction unless one of the rings is intentionally broken and removed.