Ransburg Corporation

The Aro Corporation

The Ritten Corporation, Ltd.

William L Smart

Stuart Alfred Hoenig

Christian W Savitz

Douglas K Darlington

Daniel C Hughey

Frederick W Woodruff

A bi-directional system for ensuring that a ground connection is made in a three-wire conductor system including a line 'hot' conductor, a line neutral conductor, and a ground conductor includes a circuit for generating direct current potential related to the potential difference between the line 'hot' conductor and ground and a second circuit for generating a direct current potential related to the potential difference between the line 'hot' conductor and ground. A circuit including a male plug for insertion into a female receptacle includes a first prong for coupling alternatively to the line 'hot' conductor or the line neutral conductor, a second prong for coupling alternatively to the line 'hot' conductor or the line neutral conductor, and a third prong for coupling to the line ground conductor. Coupling of the first prong to the line 'hot' conductor causes the second prong to be coupled to the line neutral conductor and coupling of the first prong to the line neutral conductor causes the second prong to be coupled to the line 'hot' conductor. Conductors are provided for coupling the first circuit to the first and third prongs and for coupling the second circuit to the second and third prongs. Each of the first and second circuits includes a Zener diode for sensing the potential across the 'hot' and ground conductors and for switching in response to the presence of potential difference, which tends to indicate the presence of ground potential on the ground conductor.

Ground assurance circuit

A hand-held grinder including a motor, a motor output shaft and a grinding tool mounted on the motor output shaft. Water is supplied from a source through a port into a sealed annular chamber surrounding the output shaft. A bore extends concentrically through the shaft between a point adjacent the annular chamber and the end of the shaft remote from the motor. Communicating bores extend radially through the shaft and through a collar keyed to the shaft from the concentric bore to the annular chamber. Additional bores, adjacent the end of the shaft remote from the motor, provide communications between the concentric bore and the outside of the shaft. Preferably, the sum of the cross-sectional areas of these last-mentioned bores is relatively less than the cross-sectional area of the concentric bore. Water dispensed through these communicating bores is atomized by rotation of the motor output shaft and grinding tool. The atomized water particles are directed toward the work piece upon which the grinding operations are being performed to capture respirable micron and sub-micron sized particulate contaminants generated by such grinding operations. In other embodiments of the invention, nozzles are provided to atomize the water. The nozzles are located adjacent the grinding tool. Desirably, the nozzles are flexibly mounted so that they can be aimed at the region of the grinding tool at which the particulate contaminants are being generated. In one of the atomizing nozzle embodiments, the motor is an air motor and exhaust air from the motor is used to atomize the water in the nozzle.

Grinder apparatus with pollution control fluid dispensing means

A compact apparatus for removing harmful particulate contaminants from the air in a work space includes a nozzle for atomizing water. The nozzle is connected to a supply of compressed air and to a supply of water, e.g., an ordinary water tap or storage tank. The apparatus also includes a metal ring and a power supply coupled to the ring to charge atomized water inductively as the water is expelled from the nozzle. A collar supports the ring in fixed, spaced-apart relation adjacent the nozzle. The collar is constructed, at least in part, from a non-conductive plastic, such as nylon, to avoid shorting of the power supply. Additionally, the collar includes a compressed air supply passage for introducing a stream of air into the collar. This air flows past the nozzle and the ring to prevent accumulation of water on the ring and collar and the electrical shorting which may result therefrom. Additionally, the stream of air minimizes degradation of the electrical charge on the fog of atomized water which would otherwise result from the addition thereto of oppositely charged water particles originating from the accumulation of water on the ring.

Apparatus for removing particulate matter from an atmosphere

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Indianapolis, IN, United States of America

William L Smart