Geometrical instruments
Patent
1977-09-12
1980-09-23
Lyddane, William E.
Geometrical instruments
85 50R, 85 85, 339263R, H01R 708, F16B 1304
Patent
active
042235863
ABSTRACT:
An anchor, suitable for use with sheet metal screws and the like, has particular utility in the making of repairs where an article is to be secured by a sheet metal screw in an oversized blind hole formed in a second article. The anchor includes a washer-like head having an opening for passage through the head of the shank of the screw. An elongate laterally deflectable and deformable finger is connected at one end thereof to the head effectively along a portion of a boundary of the opening. The other end of the finger is spaced from the head. The finger is so positioned relative to the opening that the finger, upon insertion thereof into a hole in an article to which a connection is to be made and upon insertion of the pointed shank of the screw into the hole through the opening, interferes with the screw threads to provide a bite for the threads. Also, the interference of the threads with the finger causes the finger to tend to deflect away from the threads and to deform between the threads and the hole sufficiently to jam in the hole to secure the finger from turning in the hole as torque is applied to the screw.
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