| 摘要 |
1376496 Screw sockets ILLINOIS TOOL WORKS Inc 28 March 1972 [29 March 1971] 14541/71 Heading F2H A one-piece plastics socket 20 for securing a screw 48 in an apertured panel 38 comprises a head 22 on one end of a hollow shank 26, a boss 42 under the head forming the base of the shank and providing an inclined abutment face, and diametrically opposite resilient arms 34 which extend from the leading end 24 of the shank towards the head 22 and, in their free state, flare outwards from the shank. The outer, screw-receiving portion of the shank bore is generally rhombic in cross-section. As the socket is pushed into the aperture, the arms 34 deflect inwards until, when the head 22 abuts the panel, the boss 42 fits into the aperture, the tips of the arms 34 abut the abutment face of the boss 42, and notches 44 at the ends of the arms 34 engage the rear edge of the aperture. When the screw shank 46 enters the socket, it expands the latter transversely to touch inner surfaces of the arms 34 to lock the socket in the aperture. The shank 26 is square in plan and the arms 34 may extend adjacent opposite corners (Fig. 10), or adjacent opposite sides (Fig. 2, not shown). A second panel 40 may be clamped by the screw 48.
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