Abstract A washer-like safety device serving as a retainer for a headed fastener, such as a screw. The invention contemplates the screw or other fastener being applied in a counterbored passage having in the wall thereof an undercut forming a groove. The retainer is here disclosed as a plate having parallel sides, rounded ends, and a central aperture. The ends are flat and co-planar while the side portions bounding the aperture are offset in the form of an inverted ''''V.'''' The retainer is dimensioned to easily set in the counterbore cavity to overlie the slotted or socketed head of the screw, whereupon its side portions are flattened to project its rounded ends to bridge the cavity and enter the groove. This retains the screw in the body to which it is applied while permitting its rotation for engaging to or disengaging from a related structure.
In combination, a body having a cavity with a fastener therein for releasably attaching said body to a mounting surface and a device for retaining said fastener in said cavity in said body, said fastener having a head with a tool receiving recess therein, said cavity having a circumferential groove disposed above the head of said fastener, said device comprising an essentially planar member with a continuous periphery, said member being elongated in one direction defining the length thereof and having a deformable offset extending the width thereof which offset is designed to be flattened against the head of said fastener to a plane substantially perpendicular to the longitudinal axis of said cavity to thereby increase the length of said member in a direction generally at right angles to said offset and to cause end portions of said member to project in said groove, the width of said member having a dimension less than the diameter of said cavity to define a space to either side thereof, said member having an aperture within said offset of less diameter than that of the fastener head to accommodate projection therethrough of a tool to manipulate said fastener or to facilitate the removal of said member, and said member when flattened having a length which is less than the maximum diameter of said groove to permit a rotative move thereof when flattened within said cavity.
Claim 2
Dependent Claim
232 words
In combination, a body having a cavity with a fastener therein for releasably attaching said body to a mounting surface and a device for retaining said fastener in said cavity in said body, said fastener having a head with a tool receiving recess therein, said cavity having a circumferential groove disposed above the head of said fastener, said device comprising an essentially planar member with a continuous periphery, said member being elongated in one direction defining the length thereof and having a deformable offset extending the width thereof which offset is designed to be flattened against the head of said fastener to a plane substantially perpendicular to the longitudinal axis of said cavity to thereby increase the length of said member in a direction generally at right angles to said offset and to cause end portions of said member to project in said groove, the width of said member having a dimension less than the diameter of said cavity to define a space to either side thereof, said member having an aperture within said offset of less diameter than that of the fastener head to accommodate projection therethrough of a tool to manipulate said fastener or to facilitate the removal of said member, and said member when flattened having a length which is less than the maximum diameter of said groove to permit a rotative move thereof when flattened within said cavity.
Claim 3
Dependent Claim
25 words
Apparatus as in claim 1 characterized by the sides of said member being generally parallel and the ends of said member having a rounded configuration.