Abstract: Wear of a pump is estimated using a process that involves operating the pump to drive a hydraulic actuator that moves a member. The actual speed of the member is determined and the speed of the pump is sensed. Pressure of fluid conveyed from the pump to the hydraulic actuator also is sensed. A predicted speed of the member is calculated based on the speed of the pump and the pressure of the fluid. The predicted speed is compared to the actual speed and the result is employed to provide an indication of a degree of wear of the pump. The difference between the predicted speed and the actual speed increases as the pump wear increases.

Abstract: Wear of a pump is estimated using a process that involves operating the pump to drive a hydraulic actuator that moves a member. The actual speed of the member is determined and the speed of the pump is sensed. Pressure of fluid conveyed from the pump to the hydraulic actuator also is sensed. A predicted speed of the member is calculated based on the speed of the pump and the pressure of the fluid. The predicted speed is compared to the actual speed and the result is employed to provide an indication of a degree of wear of the pump. The difference between the predicted speed and the actual speed increases as the pump wear increases.

Abstract: The invention here disclosed is a back wire ground clamp for a wiring device such as a switch or receptacle having a ground strap which supports an outwardly projecting ground lug having a front edge and adapted to receive a ground connection. The ground lug is coupled to a clamp plate by means of a screw which passes through a clearance opening in the clamp plate and is threaded into a receiving opening in the ground lug. The clamp plate supports a blocking tab which extends downward below the front edge of the ground lug and extends side ways for a distance which is less than the length of the front edge of the ground lug. The blocking tab prevents the clamp plate from rotating relative to the ground lug as the screw is tightened and defines an opening between the clamp plate and the ground lug along the front edge of the ground lug into which a single ground wire can be inserted.

Abstract: This invention is directed to a receptacle having an indictor which identifies the receptacle as being a hospital grade receptacle. The indicator can be a green colored window in the face of the receptacle that is always visible. A light emitting means such as a light emitting diode located behind the window and coupled across the phase and neutral contacts of the receptacle provides a positive indication that the receptacle is connected to a live circuit.

Abstract: This invention is directed to a receptacle having an indictor which identifies the receptacle as being a hospital grade receptacle. The indicator can be a green colored window in the face of the receptacle that is always visible. A light emitting means such as a light emitting diode located behind the window and coupled across the phase and neutral contacts of the receptacle provides a positive indication that the receptacle is connected to a live circuit.

Abstract: The invention here disclosed is a back wire ground clamp for a wiring device such as a switch or receptacle having a ground strap which supports an outwardly projecting ground lug having a front edge and adapted to receive a ground connection. The ground lug is coupled to a clamp plate by means of a screw which passes through a clearance opening in the clamp plate and is threaded into a receiving opening in the ground lug. The clamp plate supports a blocking tab which extends downward below the front edge of the ground lug and extends side ways for a distance which is less than the length of the front edge of the ground lug. The blocking tab prevents the clamp plate from rotating relative to the ground lug as the screw is tightened and defines an opening between the clamp plate and the ground lug along the front edge of the ground lug into which a single ground wire can be inserted.