Patent GB-649101-A (GB)
Title: Material loading apparatus
IPC: E02F3/348
Filed: 1947-08-08
Abstract: 649,101. Load-handling machines &c. JOY MANUFACTURING CO. Aug. 8, 1947, No. 22059. Convention date, March 19, 1940. [Class 78 (iii)] [Also in Group XXI] A material loading apparatus of the kind having a swingable frame structure for swinging a shovel or the like from a material receiving position to a material discharging position and vice versa is characterized in that the pivotal support for the swingable frame is situated above the lowest part of the frame at any point throughout the swing- ing, and consists of guiding means extending along a fixed support first horizontally, or slightly inclined downwardly, and then towards its rearward extremity having means for effecting an elevation of the frame. A mine car loader consists of a truck frame 2 travelling on a track 3 and having a turntable 4 provided with side members 5 mounted on a central vertical pivot on the truck frame. A frame 14, supporting a shovel 13 is mounted between the side members for swinging between positions A and B. The pivotal support for the frame 14 consists of a pair of rollers mounted on it and engaging a pair of guides 16, one on each side member 5. In Fig. 4 the guides 16 are horizontal at first and have an inclined portion 18 at the rear end. In Fig. 15 the guides 16 are first inclined slightly downwardly, then extend horizontally, and at the rear end are upwardly inclined. The frame is swung upwardly by means of a pair of chains 27, each of which is attached at one end at 29 to a semicircular portion 15 on each side of the frame, and wound on a drum 28 driven from a fluid pressure motor. The frame is guided to rotate during travel along the guides by attaching pairs of cables 20 and 23, Fig. 15, to points 21 and 24 respectively on the turntable 4, their other ends being respectively connected at points 22 and 25 at either end of each portion 15 of the frame, the latter connections including spring tensioning means to allow limited stretch of the cables. As the shovel 13 approaches the material discharge position the turntable 4 is caused to be aligned with the truck frame 2 by means of mechanism which includes a pair of fluid cylinders 51, Fig. 4, as is fully described in Specification 643,732. On reaching the material discharge position the fluid supply to the motor operating drums 28 is cut off and the frame 14 is arrested by a pair of spring buffers 55, one of which is shown, Fig. 9, attached to a cross-member 54 extending between the side plates 5. Centrally of the cross-member is secured a cylinder 58 having a piston 59 mounted on a rod 60. Upon frame 14 hitting the buffers, a cross-member 76 extending between the semicircular portions 15 presses the rod 60 home, whereupon the end of a slot 75 in rod 60 engages a pivoted lever 73 to open a valve 62 admitting fluid through pipe 69 to the cylinder 58. This thrusts rod 60 outwards against the member 76, thus pushing the frame 14 sufficiently to cause rebound beyond the point where it will descend under its own weight. When rod 60 is fully extended, the inner end of slot 75 engages lever 73 to close valve 62 until the next swinging of frame 14.