| 摘要 |
958,791. Stud and socket fastenings. ELLIOTT BROS. (LONDON) Ltd. Sept. 21, 1960 [Sept. 25, 1959], No. 32781/59. Heading E2B. [Also in Division G6] A latching device in combination with a rod, particularly suitable for use with control rods in nuclear reactors, comprises relatively movable inner and outer tubular members, E and A when passing a rod P, and detent elements formed by balls H, J carried on the member E, the balls being projectible in consequence of relative movement between the members E and A into and out of positions wherein movement on the part of said rod is imparted or not imparted to the member E, a predetermined number of backward and forward movements of the rod being necessary before the member E unlatches the rod. In operation, the rod P is lifted by a winch and is able to pass the lower balls J which in Fig. 1 are situated in recesses C in the member A. The upper surface of the rod contacts the upper balls H which project from the member E and the member is raised until the balls H move into an annular recess M to allow the rod to be lifted clear of the member A if desired. When the rod P is removed, it pivots some triggers T such that the heads of the triggers engage in a slot 8 in the member A to support the member E. When the rod is lowered it moves the member E downwardly by contact with the balls J. As the member is raised or lowered it rotates due to detents on the member A co-operating with a groove F in the member E, a development of the member E in Fig. 8 showing this groove. The member rotates 30 degrees with each movement such that with each complete up and down movement the lower balls J alternately occupy the recesses C or project inwardly to prevent further lowering of the rod P. To lower the rod from this position shown in Fig. 3, therefore, the rod must be first raised and then lowered in order to rotate the sleeve the requisite amount. |
