Device for detecting faulty recesses

Details Device for detecting faulty recesses Device for detecting faulty recesses

1998-07-16

1999-10-26

Hail, III, Joseph J.

Threaded, headed fastener, or washer making: process and apparat

Process

Making externally threaded fastener, e.g., screw or bolt

470 12, 411 8, 72 3101, B21H 302

Patent

active

059718609

ABSTRACT:
A fastener and method of manufacturing a threaded fastener with a tool-receiving recess in the fastener head are provided including a gauging indicator for indicating whether the recess is properly formed to meet standards. The gauging indicator is preferably in the form of a protrusion of a predetermined size on the fastener head which changes when the punch forming the recess becomes worn or broken. In this instance, the protrusion will be reduced in size as the material of the protrusion is displaced into the fastener head and other material of the fastener head is pushed into the areas of wear or breakage on the punch. Accordingly, the size of the gauging indicator provides an indication of whether the recess is meeting standards.

REFERENCES:
patent: 2996943 (1961-08-01), Johnson
patent: 3316744 (1967-05-01), Spangler
patent: 4033003 (1977-07-01), Marroquin
patent: 4099475 (1978-07-01), Lee, Jr.
patent: 5119311 (1992-06-01), Gold et al.

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