Patent GB-190603255-A (GB)
Title: Improvements in Safety Apparatus for Winding Engines.
Inventor: FOGGO WILLIAM
Filed: 1906-02-10
Granted: 1907-02-09
Abstract: 3255. Foggo, W. Feb. 10. Stop - gear ; reversing levers; starting - engines ; valves and valve-gear; winding-engines; starting and stopping brakes.- Relates to safety appa-; ratus for the winding- engines of mine cages &c., and comprises means for preventing overwinding and starting in the wrong direction. The arrangement of the control lever and the steam brake, which do not in themselves form part of the invention, is shown in Fig. 1. The hand-lever 3 controls the ordinary reversing-link 61 connected by rods to eccentrics on the winding-engine shaft. The winding-drum 1 is fitted with a pair of brake blocks 4, 5 mounted on uprights 6, 7. The brake is applied either by a pedal 19 and lever 2, or by a piston moving in the cylinder 20. The pedal lever 2 is mounted loosely on the weigh-shaft 15, and communicates its rocking motion to that shaft by acting on the upper side of a small lever 28. The piston-rod is connected to the weigh-shaft by a lever 26 having a pin-and-slot connexion with a link 27 hinged to the cross-head, thus allowing the brake to be operated by the pedal without moving the piston. The hand-lever 3 is fitted with a small pivoted lever 35 adapted to raise a rod which is connected at its lower end to one arm of a bellcrank lever 37. The other arm is connected to a flanged sleeve sliding along the hand-lever shaft and engaging a fork 46 keyed to the shaft 50, which is connected by an arm 52 and rod 53 to the slide valve controlling the admission of steam to the brake cylinder 20. If the small lever 35 is released, springs are arranged to slide the flanged sleeve along its shaft, thereby rocking the weighshaft 50, raising the slide valve, and applying the brake. The downward motion of the piston 22 causes the lever 55, by means of a vertical groove in the cross-bead, to assume a vertica position, thereby placing the reversing-link 61 and the handlever 3 in the central position. The mechanism for automatically applying the steam brake and returning the reversing-lever to the central position in the event of an overwind or a start in the wrong direction is shown in Figs. 4 and 6. A spur-wheel on the winding-drum shaft gears with a wheel 67 composed of two wheels fixed together so that all back-lash can be taken up. This wheel is keyed to a hollow shaft which drives by a feather key the screwed shaft 72, which rotates in a fixed nut 74 and carries a pair of catch arms 80, 81, keyed to the shaft and secured by set-screws. The travel of the shaft 72 corresponds to the height of the pit shaft, and, when the cage is nearly at the top or bottom of its shaft, one of the catch arms, say 81, engages a loose disk 76. A V-shaped notch in this disk is engaged by the end of a lever 90, Fig. 6, so that as the disk is rotated the lever 90 is forced down, thereby rocking the shaft 91, the movement of which is conveyed by a crank 94 and rod 95 to the weigh-shaft 50, Fig. 1, which operates the brake-cylinder slide valve and the reversing-link as above described. The position of the cage in the shaft is indicated by a pointer 98 mounted on a pinion engaging a rack 101 connected to the sliding shaft 72.