Patent GB-851995-A (GB)
Title: Improvements in or relating to movement controlling devices
IPC: B61J3/08
Filed: 1956-11-09
Abstract: 851,995. Propelling vehicles. RHYMNEY ENGINEERING CO., Ltd., and PARSONS, G. W. Nov. 8,1957 [Nov. 9,1956], No. 34369/56. Class 104 (2). A vehicle movement control device comprises displaceable vehicle engaging means and a vehicle stop mounted on a carriage movable over a framework and means including a piston head for moving the carriage between first and second positions, the piston head being connected to the carriage to permit limited movement of the head relative to the carriage to move the vehicle stop from an operative to an inoperative position and permit movement of the stop back to the operative position. In the arrangement shown in which a framework lies between rails on which mine cars run a carriage 11 is slidably moved between members 5 and 6 by a double acting pneumatic or hydraulic cylinder 8 having a piston rod 9 provided with a head 10 having a slot 12 through which passes a cross strut 13 attached to the carriage 11. Pivotally mounted on the carriage 11 is a pusher dog 14, weighted at 15, and a double pronged vehicle stop 16. When the carriage 11 is in the position shown in Figs. 1 and 2 it contacts two plates 17 each connected to one or other of two rods 18 mounted in guide members 19, 20. The rods 18 are connected to members 21 operatively connected to forward stops 22. Between members 5 and 6 at one end thereof is a further pivoted arm 24 provided with bifurcated arms 25 and a common arm 26. Mounted adjacent the arm 24 are rods 27 loaded by means of springs 30 and connected at one end to an axle 28 and at the other to a plate 29. With the parts of the device and the mine cars c<1>, c<2> in the position shown in Fig. 2 the device operates as follows. The carriage 11 abuts against plates 17 to move the rods 18 against springs 23 in order to move stops 22 to the inoperative position thus allowing a car c<2> to run into a position over the carriage 11 in which the front axle of the car c<2> firstly pivots the pusher dog 14 and then contacts the stop 16, the impact between the axle of the car c<2> and the stop 16 being absorbed by the compressed fluid in the cylinder 8. Compressed fluid is now admitted to the cylinder 8 to initially move the head 10 until the right-hand edge of the slot 12 contacts the cross strut 13 and the stop 16 is rotated to the inoperative position, Fig. 3 (not shown). The carriage 11 is now moved to the left to propel the car c<2> by means of the pusher dog 14. The car c<2> on moving forward displaces car c<1> since the stop 24 shown in Fig. 2 is in the inoperative position. Forward displacement of the carriage 11 enables the spring 23 to move the rods 18 in order to pivot the stops 22 upwardly to the operative position, Fig. 3 (not shown), and thus prevent forward movement of oncoming cars. Impact shocks on the stops 22 are absorbed by the springs 31. The carriage 11 on reaching the left-hand position, Fig. 3 (not shown) abuts the plate 29 to cause the rods 27 to move the stop 24 into the operative position to engage an axle on the car c<2> and thus prevent forward movement thereof. Fluid is now admitted to the cylinder 8 to return the carriage 11 to its original position. Initial movement of the rod 9 causes movement of the head 10 relatively to the carriage 11 to permit the return of the stop 16 to its operative position once the rear axle of the car c<2> has been cleared. The carriage 11 on returning to its original position disengages the plate 29 to enable the springs 30 to return the plate 29 to its original position and to move the stop 24 into its inoperative position. When the carriage 11 reaches its initial position, shown in Fig. 2, plates 17 are depressed to move the stops 22 to the inoperative position to allow a car to move into position above the carriage 11 and the process is repeated.