| 摘要 |
PURPOSE:To easily and reliably grasp whether a cock is closed or not by pulling out a key opening and closing the cock only when the cock is located at a complete close position. CONSTITUTION:A plug body 2 is provided with a conduction hole 5 which is connected and disconnected to and from inlet and outlet 4, 4 of a cock body, and the head portion thereof is provided with engaging holes 6 where the forward fingers 11 of a key 10 are fitted and engaged. Projections 13 fitted in engaging grooves 12, 12 of the key 10 to be engaged with the key 10 are disposed on the upper surface of the cock body. Only when the plug body 2 is located at a fully- close position, the key 10 is inserted through a slit 16, and the forward fingers 11 thereof are fitted in the engaging holes 6 and engaged therewith. On turning the key 10 from the fully-closed state in the fully opening direction, the engaging grooves 12 of the key 10 are fitted to the projections 13, so that the key 10 will not be pulled out. |
