| 摘要 |
918,649. Linkwork. AMERICAN MACHINE & FOUNDRY CO. March 23, 1961 [April 1, 1960], No. 10673/61. Class 80 (3). [Also in Group XL (a)] In a remote control mechanism, particularly for handling radio-active material, a control cable 51 is first tensioned by movement bodily of a pulley 50, around which the cable 51 passes, and is subsequently further tensioned by rotation of a pivoted cable lever 55 to which the end of the cable 51 is clamped. The pulley 50 is moved bodily by squeezing together finger and thumb grips 20, 21, thereby causing lateral movement of a shaft 42 carrying pivoted selector plates 34, 39 having arcuate extensions 46 engaging a shaft 48 on which the pulley 50 is mounted. The shaft 48 is held in its new position by a ratchet bar 59 pivoted on the shaft 48 and engaged by a pawl 63. Shaft 33 and its associated selector plates 34, 39 are retracted to their original position by spreading apart the finger grips 20, 21. In order to rotate the cable lever 55, the selector plates 34, 39 are moved downwardly so that arcuate portion 47 engage a shaft 49 which is connected to the cable lever 55 by a Unit 71. Squeezing together of the finger and thumb grips 20, 21 causes movement of the shafts 33, 49 and hence rotation of the cable lever 55 to further tension the cable 51. The link 71 is provided with a ratchet bar 72 which is engaged by a pawl 75 to hold the link in its operative position. The cable tension is released by operation of a trigger 80 which causes disengagement of the pawls 63, 75. A cam 89, actuated by a lever 90, is provided for rendering the pawls 63, 75 inoperative. U.S.A. Specification 2,764,301 is referred to. |
