| 摘要 |
<p>604,941. Fastenings. FRAISSANGE, R. J. R. Sept. 24, 1945, No. 24648. Convention date, Sept. 28, 1944. [Class 44] A device for securing a shutter by means of a bolt passed therethrough, comprising a plate secured to the inside of the door, and either one or two spring-urged latch members pivoted, like first order levers, towards the middle of the plate and actuated by end thumb-pieces, the tip of the bolt having a peripheral groove in which the latch members engage in the locking position, is characterized in that said plate is provided with a U-shaped channel in which said latch members are guided. A plate E, Fig. 2, secured on the inside of the door has a circular aperture G through which passes the conical tip of a bolt A, the head of which remains on the outside of the shutter thus holding it against the glass. Fulcrummed to the plate E on pivot pins U are two latches H, operated by thumb pieces I at one end, and having cut-out portions J near their other ends for gripping the bolt A by engaging in a peripheral groove C therein. The ends of a spring K, which is wound about a stud L on the plate E, press against the thumb-pieces I urging the latches into operative position. By pressing the thumb pieces together the bolt is freed. To guide the latches and limit their swing the top edge of the plate E is bent up twice into U-shape, and two slots S are cut for the upper ends of the latches to pass through. The bolt is of circular cross-section so that turning its head will not disengage it from the latches. If one latch H, Fig. 4, is used, the inoperative leg of the spring K bears against a bent-up portion N of the plate E ; on the edge of the aperture G remote from the latch H a bent-up neck Q is formed which engages in the groove C of the bolt in place of the missing latch.</p> |
