Abstract: An elongated spring member such as a leaf spring which is normally flat in a relaxed state, is a bowed by compression between opposite ends and pressed into surface contact with a endless conveyor belt to scrape the belt during belt movement under considerable pressure such that the central portion of the spring member flattens against the belt under self-bias to maintain an edge of the spring member in intimate contact with the moving conveyor belt for scraping of debris clinging to the surface thereof. The spring member may have integral loops for added resilience to permit the central portion of the spring member to ride over lumps on the belt which are not dislodged during belt movement over the scraper. One or more elongated spring members may be employed in an assembly which is moved towards and away from the belt surface to provide selective contact between the bowed central portion of the elongated spring member and the belt.

Abstract: The elevator car is suspended on cables which are entrained on a pulley, and which have ends distal of the car anchored to the hoistway floor. The pulley is journaled on an upper end of a lift tube which is telescoped into a cylindrical housing anchored to the hoistway walls. A ball screw drive is mounted inside of the lift tube and is rotated therein by a reversible DC motor housed in the hoistway pit below the ball screw. A ball nut assembly is mounted on the ball screw and fixed to the lift tube so that rotation of the ball screw results in raising and lowering the lift tube and pulley. This causes concurrent raising and lowering of the elevator car in the hoistway. An electromagnetic brake selectively acts on the DC motor to hold the elevator car in place in the hoistway at landings.

Abstract: Plastic material is molded in the form of a sheave (20) about a wire steel brush (10), and interspersed between the bristles (14) thereof. A conductive path is provided to a cable (26) against which the sheave is urged via the bristles, which extend radially to the outer surface (22,24) of the sheave, and the hub (12) of the wire wheel brush.

Abstract: The front endcap (10) and mounting bracket (26) for a motor are unitary for motor interchangeability. The endcap (10) has a disc-like portion (12) and a tubular boss (22) extending therefrom that receives in its bore the motor shaft (44) and bearings (68). A portion (50) of the motor shaft extends beyond the boss to receive a sheave (56), a rim portion (72) of which extends over the boss so that the sheave load is more in line with the bearings. Furthermore, the sheave may be bolted to the endcap boss for motor replacement.

Abstract: The effect of a three way lamp bulb is achieved with a single filament bulb through the use of a variable duty cycle circuit and a touch control mounted in the base of the lamp. The circuit features a touch control incremented counter which controls the ramp rise rate of a sawtooth generator which is synchronized with the A. C. source. A trigger circuit accepts the sawtooth waveform to produce triac control pulses of time durations dependent upon the ramp rise rate.