Patent GB-675031-A (GB)
Title: Improvements in or relating to governor apparatus
Inventor: SHARROCK JOHN HENRY
IPC: B66B5/04
Filed: 1949-11-26
Abstract: 675,031. Winding apparatus. WALKER BROS. (WIGAN), Ltd. Nov. 27, 1950. [Nov. 26, 1949] No. 30353/49. Class 78 (v). In governor apparatus for preventing overspeed. &c. of mine cages. tubs. &c. of the type wherein the position of a profile control member is adjusted by a centrifugal governor relatively to a member travelling proportionately to the cage, or wherein the position of a control means is adjusted by a governor relatively to a profile control member, cam, &c. travelling proportionately to the cage, and wherein the profile control member, or control means, is preadjusted, or compensatingly adjusted, by inertia governor means auxiliary to the centrifugal governor in order to vary the time lag in the displacement of the parts, a trip or like element in the mechanism is controlled by a dash-pot whose effectiveness is governed by a traveller element which is displaced proportionately to the cage so as to cause a reducing effectiveness towards the end of the travel of the cage and maximum effectiveness through the middle of the wind, the valve of the dash-pot being adjusted by an angularly displaceable quadrant actuated by the traveller element and having a cam slot therein which in turn actuates a linkage connected to the valve. The mechanism is stated to be suitable for use with the control apparatus described in Specification 415,112. The trip lever 59, Fig. 1, of that Specification is prevented from moving clockwise by a detent 62 and abutment rod 63, the construction of which is described in Specification 674,425. The trip 59 is loaded by a spring 61 arranged within a dash-pot cylinder 10 and abutting against the underside of a piston 11. The ends of the dashpot are connected by a pipe 12, Fig. 2, containing a valve 13, the controlling arm 14 of which is connected by a link 15 to the longer arm 16 of a bell-crank lever. The shorter arm 17 of this lever has a side projection 18 which extends into a cam slot 19 in a quadrant 20 fast on a shaft 21. An arm 22, also fast on this shaft, has a slidable connection 23 with a threaded spindle 38 which carries the travelling notched disc. 37. During the middle of a wind the projection 18 is in the middle part of the slot 19 and the valve 13 is more or less closed to damp the action of the trip 59. Near the end of a wind the projection enters an eccentric part 26 of the slot 19 and the bell-crank lever is displaced to open fully the valve 13. In order to facilitate resetting after tripping, the piston 11 has ports 30 controlled by a disc valve 31 having limited movement between the end of the piston and the nut 32. When the lever 59 is moved counterclockwise for resetting, the piston 11 will move from left to right and the valve 31 will open to allow liquid to pass freely through the ports 30. A liquid suitable for use in the cylinder is stated to be that sold commercially under the registered Trade Mark "Discol". In order to enable a standard quadrant to be used for varying lengths of wind, the quadrant 20 may be formed of two sectoral quadrant elements which overlap so that the effective length of the concentric part of the cam slot may be adjusted by relatively angular adjustment of the quadrant elements.