Abstract: An inclination drive mechanism for a treadmill permits driven, selective adjustment of the angle of inclination of the treadmill. The drive mechanism includes an electric motor which operates through a gear train including an output gear pinion. The gear pinion in turn drives a gear rack, which can be provided in either a linear or arcuate configuration. The mechanism includes a load-bearing support bracket on which the gear rack is mounted with the support bracket configured to minimize non-torsional loading of the gear train. The resultant construction is desirable economical and durable.

Abstract: An electrically-operated fire damper actuator is disclosed which is adapted to operate an associated fire damper having louvers movable between opened and closed positions, with the damper or the actuator including a closing spring which urges the louvers to the closed position. The present actuator is configured to open the louvers in opposition to the closing spring, and maintain the damper in an opened condition against the action of the closing spring, while permitting the damper to close in the event of loss of power to the actuator. The actuator comprises an electric motor which operates through a multi-stage gear reduction unit for opening the louvers in opposition to the closing spring, and further includes an electric brake operatively connected to the motor rotor shaft for maintaining the damper louvers in the opened position.

Abstract: An electric motor having an improved braking arrangement is disclosed. The braking arrangement includes a stop pawl armature assembly disposed coaxially upon the rotor shaft of the motor for axial movement with respect thereto in response to the magnetic field created by the stator assembly of the motor. The braking arrangement further includes a stop member disposed on the rotor shaft arranged to normally rotate therewith. The stop member functions in the nature of a slip clutch, and is adapted to cooperate with the armature assembly for effecting braking of the motor. During motor operation, the armature assembly is shifted by the magnetic field of the motor stator assembly so that a pawl portion of the armature assembly is moved out of the rotational path of a lobe portion of the stop member. When the motor is switched off, the pawl portion of the armature assembly is moved into the path of the lobe portion, and is engaged thereby.