| 摘要 |
854,494. Masked lift trucks. CLARK EQUIPMENT CO. Sept. 8, 1958 [Nov. 18, 1957], No. 28695/58. Addition to 806,963. Class 78 (3). In a masted lift truck, provided with a load carrier 18 pivoted to the joint 120 of a pair of levers 10, 12, the free ends of which are pivoted to members 14, 16 each movable along guides 22 on the lifting carriage, as described in the parent Specification, means are provided for selectively coupling the load carrier to either lever independently of the means for moving the members 14, 16 along the guides 22. The levers 10, 12 are each provided with a rectangular opening 140, 142, respectively, in which is mounted a locking cylinder 146 comprising a pair of pistons 150, Fig. 7, having piston-rods 152 which are urged outwardly by means of a spring 156 and which are retracted by supplying hydraulic fluid through a pipeline 158. To lock the load carrier to lever 10, the corresponding piston-rods 152 are retracted and lugs 122, 126 on the load carrier are engaged in slots in the lever 10 to bring slots in the lugs into alignment with the piston-rods 152 which are then extended by means of the spring 156 on releasing the fluid pressure in the pipeline 158. The supply of fluid pressure to the locking-cylinders 146 is controlled by valves adjacent to valves for controlling rams 62, 64, and 66, 68 which move the members 14, 16 on rollers along the guides 22. The cylinders 64, 68 move along pistonrods 62, 66, respectively, and are provided with pulleys over which pass cables connected between fixed points and the members 14, 16. The mast assembly of the truck is as described in Specification 818,457, and the forks 20 are adjustably mounted on the load carrier 18, as described in Specification 802,614. |
