Improvements in or relating to Apparatus for Preventing Overspeeding and Overwinding in Colliery Winding Engines, and the like.

摘要

22,679. Moysey, H. J. Oct. 5. Overwinding, preventing; emergency power cutoff gear.-Apparatus for preventing the overwinding and over-speeding of winding - engines &c. comprises a screw- and - nut depthindicator and a sleeve d rotating on the square end b of the screw shaft a, the sleeve being moved endways as the cage approaches the end of the wind so that a rotating arm u thereon engages a trip lever f. At one end of the wind. the nut c engages the sleeve d directly, and at the other end it raises a weight k which is coupled by a suitable linkage to the sleeve d. The vertical arm f of a trip lever carries a cylindrical block g, which is raised and lowered by a governor h according to the speed of the engine. If the speed is not suitably controlled during the acceleration or retardation periods, the roller e on the rotary arm u engages the block g and releases a trip gear to stop the engine. During the full-speed portion of the wind, the arm u rotates just above the block g and engages the latter if the speed limit is exceeded. The trip lever f is rigidly connected to an arm D controlling the power supply, and to a second arm B which normally retains a drum out of engagement with a driving-clutch, but when actuated causes the drum to rotate and gradually to wind up a brake chain. Another trip lever v, which is actuated when the cage passes the level, cuts off the power and applies the brake fully.