Abstract: An improved locking bolt for a T-handle assembly is provided. The locking bolt has an associated security collar which encircles the bolt and prevents axial movement of the T-handle housing relative to the bolt when the threaded end of the bolt is threaded into the door frame of the closure. The security collar is held in place by a pin which extends through corresponding apertures in the collar and the bolt. A ball bearing is positioned in a recess formed in the bolt to prevent axial movement of the collar on the bolt in the event that the pin is defeated. The bolt and the security collar also act as a secondary locking mechanism by preventing rotation of the bolt when the lock is released, a special wrench being required to rotate the bolt after the lock is removed.

Abstract: A modular enclosure acts in combination with a ventilation system to prevent passive smoke from spreading to an adjacent area. The enclosure is designed in accordance with the traditional workstation configuration. A plurality of panels form a partial enclosure about a desk. The desk has a top surface with front and side edges having perforated conduits attached thereto. The inner surfaces of the panels also have perforated conduits attached thereto. These perforated conduits are attached to a main conduit whereby a suction is applied for exhausting air therefrom.

Abstract: A safety pin attachment which is capable of being releaseably locked about a conventional safety pin. The attachment has a male half and a female half which are adapted for mutual locking engagament. In one embodiment, the male half and the female half are injection molded adjacent each other and lying in the same plane, connected by a living hinge. The living hinge allows the two halves to be folded together until they are releaseably locked about the safety pin.

Abstract: A safety pin attachment which is capable of being releaseably locked about a conventional safety pin. The attachment has a male half and a female half which are adapted for mutual locking engagement. In one embodiment, the male half and the female half are injection molded adjacent each other and lying in the same plane, connected by a living hinge. The living hinge allows the two halves to be folded together until they are releaseably locked about the safety pin.