Abstract: A coupling device including a drive member that is rotatable about an axis, a driven member that is substantially aligned with the drive member and is selectively rotatable about the axis, a speed sensing member that is coupled to the drive member and is movable between a first position and a second position in response to the rotational speed of the drive member, and a clutch member that is movable between a disengaged position and an engaged position in response to movement of the speed sensing member between the first position and the second position. At least a portion of the clutch member is removable without changing the alignment between the drive member and the driven member.

Abstract: A portable light tower comprises a base and a mast. The mast is movable between a first configuration in which the mast is stored substantially within the base and a second configuration in which the mast extends in an upright position from the base. A light source is disposed on the base and a reflector is positioned on an end of the mast opposite the base. The reflector is configured to reflect light from the light source toward the surroundings of the light tower.

Abstract: A portable light tower comprises a base and a mast. The mast is movable between a first configuration in which the mast is stored substantially within the base and a second configuration in which the mast extends in an upright position from the base. A light source is disposed on the base and a reflector is positioned on an end of the mast opposite the base. The reflector is configured to reflect light from the light source toward the surroundings of the light tower.

Abstract: A coupling device including a drive member that is rotatable about an axis, a driven member that is substantially aligned with the drive member and is selectively rotatable about the axis, a speed sensing member that is coupled to the drive member and is movable between a first position and a second position in response to the rotational speed of the drive member, and a clutch member that is movable between a disengaged position and an engaged position in response to movement of the speed sensing member between the first position and the second position. At least a portion of the clutch member is removable without changing the alignment between the drive member and the driven member.

Abstract: The invention is an improvement over the system disclosed in U.S. Pat. No. 3,805,061 for detecting intrusion of a selected area by an object and for operating or terminating operation of an associated apparatus when such intrusion occurs. It consists of improved transmitter and receiver units. The transmitter comprises a plurality of radiant energy sources that are strobed sequentially and repetitively by a clocked counter. The receiver has a plurality of radiant energy detectors, means for enabling the detectors sequentially and in synchronism with the strobing of the radiant energy sources, dual control relay means for operating or terminating operation of an associated apparatus, and cross coupled control circuits for causing the relay means to change states if a radiant energy detector fails to detect a radiant energy beam while it is enabled.