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    • 9. 发明专利
    • Improvements in and relating to tools for transporting and laying building blocks and the like
    • GB756754A
    • 1956-09-12
    • GB175454
    • 1954-01-20
    • OLIVER FRANK DUKE
    • E04G21/16
    • 756,754. Holding and picking-up tools. DUKE, O. F. Jan. 20, 1955 [Jan. 20, 1954], No. 1754/54. Class 61 A tool for transporting and laying building blocks and the like comprises two pivoted jaws 1 adapted to engage the sides of a block x, a handle 6 and a linkage between the handle and the jaws adapted to close the jaws on the sides of a block when the handle is pressed downwards, releasable means being provided for holding the jaws in the block-engaging position until such time as it is required to remove the tool from the block. As shown in Fig. 1, the jaws 1 are pivoted at 2 to the ends of a bridge 3 A tube 4 is mounted on the bridge and receives a hollow shank 5 of the handle 6. A compression spring 17 urges the shank 5 upwardly. Two arms 8 extend from the shank and pass through slots 7 in the tube 4. Push-pull links 10, 11 pivotally connect the arms 8 to the ears. 16 on the jaws 1. When the bridge 3.is laid on the block x and the shank 5 depressed the links close the jaws against the block and teeth 19 on the jaws bite into the block. The jaws are held in the closed position by latching means comprising a rod 20 screwed into a bossed part 31 of the bridge and held in adjusted position by a grub-screw (not shown). A latch 22 (Fig. 3) is engaged with an inverted shoulder 21 formed at the top of the rod 20. The latch is brought into engagement with the shoulder 21 by a garter spring 23 engaging a lug 24 on the latch and surrounds the shank 5. A length of chain 25 extends round a stirrup part 26 of the handle and connects the latch to a, trigger 28 which is normally urged downwards by a spring 30 in the hand-grip 18 of the handle. When the laying operation is completed, upward finger pressure on the trigger 28 retracts the latch 22 from the shoulder 21 and upward movement of the handle 6 turns the jaws 1 away from the block.