Patent ID: 6347615
Filing Date: 2002-02-19
Classification: H01H,Y10T

Abstract:
In combination with a tap-changer vacuum switch having an actuating rod extending and displaceable along an axis, a damper comprising:a damper housing separate from and fixed relative to the vacuum switch and formed with a pair of radial ports each in turn formed with a respective outwardly open circular seat, the seats being substantially identically shaped; a rod piston fixed on the rod in the damper housing and defining in the damper housing a compartment into which the ports open and whose volume changes as the rod piston moves axially with the rod; a pair of identical check valves each having a tubular valve housing having a pair of opposite ends, respective opposite end flanges complementarily fittable in the seats and formed at the housing ends, an inwardly directed valve seat at one of the ends, a valve piston displaceable in the valve housing into and out of engagement with the respective valve seat, and a spring in the valve housing urging the respective piston toward the respective seat; and respective means for retaining the check valves in the respective seats with the flange of the one end of one of the valves fitted to one of the ports for flow only out of the one port and the other end of the other valve fitted to the other port for flow only into the other port.