Patent GB-420627-A (GB)
Title: Improvements in and relating to apparatus for controlling the operation of colliery winding engines and the like
IPC: B66B1/12
Filed: 1933-11-11
Abstract: 420,627. Winding-apparatus. BUTTERLEY CO., Ltd., Butterley, and DRABBLE, C. E., Jessop Lodge, Codnor, both in Derbyshire. Nov. 11, 1933, No. 31467. [Class 78 (v)] In apparatus for controlling the operation of colliery winding engines an element driven by the engine is operably connected with a piston moving in a dash-pot and with a pressure valve, the co-operation between the parts being such that when the engine speed is excessive, the resistance of the dash-pot piston causes the opening of the pressure valve and admits steam to a braking cylinder whereby a braking effect is applied to the engine. Hooks 18 on a pair of endless chains 17 driven by the engine in opposite directions engage hooks 19 on the lower end of each of a pair of rods 20. Each rod is carried on a pivotally mounted catch 21 engaged by a pivotally mounted bracket 22 which is controlled automatically from the engine room in such a manner that when the signal for " Men " to be wound is given, the trip operates to bring the rod 20 into alignment with the path of the hook 18, and for other windings removes the hook 19. Each catch 21 is pivoted to a link 23 attached to a cable 24 carrying a counterweight 26. An arm 27 pivoted to the links 23 supports a valve member having ports 29, 30 which communicate respectively with the pressure supply and the brake cylinder 31. The port 30 is normally closed by a plunger 32 which can be depressed against spring action by a lever associated with the arm 27. The lower end of a hollow connecting rod 34 carried by the valve casing is formed as a needle valve 35 and co-operates with a port in the piston 36 of a dash-pot 37 located in a tank 39. A pair of valves 41, 42 of the ball and mushroom type, respectively, are provided near the bottom of each dash-pot, and on being raised allow liquid to be returned to the dash-pots through ports 43. A spring- loaded stop 44 is mounted around and above the casing of these valves, and allows the piston 36 to travel downwards to a slightly further extent when necessary. When the hooks 18, 19 engage, the rod 20 is drawn down agairst the action of the weight 26, and the valve casing, pivoted levers, and connecting rod descend also, liquid being displaced through the needle valve opening and the ports 38 in the dash-pot. If the speed is excessive, the valve 35 is forced on to its seating, thereby further restricting the downward movement of the piston, and causing the opening of the ports 29, 30 with consequent application of the brakes. The piston may be allowed to descend at a greater speed when coal is being hoisted by opening passages in the side of a plug 45. The reversing lever 56, Fig. 3, of the winding engine may be moved automatically from forward or reverse position to neutral when the brakes are applied by projections 55 on pivoted levers 53 which are actuated by the descent of a weight 50 when a catch 49 is released by one of the levers controlling the cylinder 31. Arrangements are provided also for cutting off the supply of steam on the application of the brakes. In a modification the chains and hooks are replaced by threaded rods and nuts.