| 摘要 |
1,175,871. Shovelling machines. CATERPILLAR TRACTOR CO. 6 April, 1967 [11 May, 1966], No. 15883/67. Heading E1F. Detent means holding in a "bucket raise" position the control valve of a ram 16 causing vertical swinging of a bucket-carrying boom 14 is, on the ram 16 reaching a pre-determined extension, automatically over-ridden by a linkage 24, 25 actuated by the ram to allow the valve to move to a neutral position so that the ram is locked. |
