Abstract: An improved clamp for mounting a device, such as a theater lighting fixture, to a structural tubular is provided. The clamp includes a main body securable to the device to be mounted. A jaw is pivotally connected to the main body and moves from an open position to receive the tubular to a closed position such that the main body and the jaw encircle the tubular to provide high structural integrity. The jaw also moves along the pivot axis from an unlocked position wherein the jaw is spaced from the main body to a locked position wherein the jaw is substantially aligned with the main body. A lip may be provided in the jaw for fitting within a slot in the main body when the jaw is in the locked position, thus preventing the clamp from opening. A bolt carried on the jaw may be threaded for engaging the tubular and bringing a gripping surface on the main body into fixed engagement with the tubular.

Abstract: The invention comprises an electrical connection member including a main body and a connection formation extending generally from the main body. The connection formation includes walls extending from the main body and defining a pair of elongate, parallel, spaced apart shoulders. A female receptacle is recessed inwardly from the shoulders therebetween and adjacent one end thereof, and a male projection extends outwardly from the shoulders therebetween and adjacent the other end thereof by a distance no greater than the depth of the female receptacle. The connection formation further includes a generally planar interface surface, an inner portion of which defines a wall of the female receptacle, and an outer portion of which defines a wall of the male projection. The connection member can be matingly engaged with another connection member having a substantially identical connection formation. The interface surface of each of the two connection formations has a linear row of electrical contacts thereon.