Importance

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Abstract

A light fixture support member is attached to a cam plate portion of a mounting member having an elongated slot of uniform width by a cam head fastener mechanism that includes a screw having a head portion, a shank portion and a lock portion between the head portion and the shank portion. The shank portion is threaded and passes through the hole in the base portion of the support member. The lock portion is normally received in the slot of the cam plate portion and is of a size and shape such that the screw cannot rotate substantially when the lock portion is received in the slot. The head portion includes opposite shoulders that are engageable with surface portions of the mounting member on opposite sides of the slot in one rotational position of the screw and disengageable from said portions in another rotational position of the screw so that the head can pass through the slot. A knob is threaded onto the shank portion of the screw, a spring is engaged in compression between the base portion and the knob, and a stop is provided on the screw shank on the opposite side of the knob from the spring and limits the movement of the knob along the shank portion in a direction away from the head portion so that the knob cannot be removed from the screw shank.

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First Claim