Self-attachment screw

Details Self-attachment screw Self-attachment screw

1994-08-12

1996-10-08

Wilson, Neill R.

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

Process

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

470 11, 411403, 411407, B21H 302, B23G 900, F16B 2300

Patent

active

055625479

ABSTRACT:
The present invention relates to a burred fastener for forming a friction fit between the fastener and a driver. The friction fit retains the fastener in contact with the driver during insertion, tightening and loosening of the fastener into a work surface. Burrs are formed in the inner side surfaces of an indentation or slot formed in the fastener head. A method for forming the burred fasteners includes striking the screw head with a deformation object.

REFERENCES:
patent: 1934347 (1933-11-01), Flesselles
patent: 2304704 (1942-12-01), O'Leary
patent: 2676510 (1954-04-01), Hodell
patent: 4033003 (1977-07-01), Marroquin
patent: 4084478 (1978-04-01), Simmons
patent: 4497225 (1985-02-01), Vaughn
patent: 4538486 (1985-09-01), Lutrat

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