Fairchild Holding Corporation

Alan R Myers

Albert K Yamamoto

An improved fastener comprising a head portion, a flange portion, a shank portion which extends through two aligned apertures formed in adjacent panels and a collar swaged on the shank portion. The shank portion includes a gripping portion having a plurality of gripping surfaces formed between a plurality of cone shaped grooves, the configuration of the gripping portion being spiral shaped. The collar is installed by first positioning it over the fastener shank portion, an installation tool then swaging the collar thereto, the collar being tightly held by the multiple gripping surfaces to prevent movement in the direction of the longitudinal axis of the fastener. A mating spiral shaped configuration is formed along the interior surface of the collar during the swaging process. In order to remove the collar, a tool having pivotable jaw members is positioned in the space formed between the bottom surface of the shank portion and the overhanging portion of the collar, the jaw members being forced apart which, in a turn, forces the collar to expand outwardly from the fastener shank portion. A tool then engages the collar and rotates it in the counterclockwise direction, enabling the collar to spin off the shank portion.

Fastener having spiral shaped collar portion

There is disclosed an improvement in rotational wrenching tools used in the aerospace industry to apply a fastener nut to a fastener pin at a limiting, preload torsion. The pins used for the fasteners have an end recess which receives a rotational stationary key that is supported in the tool by a key holder which is slidably received in a central passage of the rotationally driven socket sleeve of the tool. This invention provides a first rotational detent at the forward end of the key holder and the central through passage and a first spring to bias the key holder axially forward into engagement with said first rotational detent to cause the key holder to rotate with the sleeve and thereby facilitate engagement and disengagement of the key with the fasteners. The invention also provides a second rotational detent at the rear end of the key holder and the housing to rotationally immobilize said key holder during run-up of the fastener nuts on the fastener pins.

Wrenching tool with free-floating, self-relieving anti-rotation key

An improved fastener comprising a head portion, a flange portion, a shank portion which extends through two aligned apertures formed in adjacent panels and a collar swaged on the shank portion. The shank portion includes a gripping portion having a plurality of gripping surfaces formed between a plurality of cone shaped grooves, the configuration of the gripping portion being spiral shaped. The collar is installed by first positioning it over the fastener shank portion, an installation tool then swaging the collar thereto, the collar being tightly held by the multiple gripping surfaces to prevent movement in the direction of the longitudinal axis of the fastener. A mating spiral shaped configuration is formed along the interior surface of the collar during the swaging process. In order to remove the collar, a tool having pivotable jaw members is positioned in the space formed between the bottom surface of the shank portion and the overhanging portion of the collar, the jaw members being forced apart which, in turn, forces the collar to expand outwardly from the fastener shank portion. A tool then engages the collar and rotates it in the counterclockwise direction, enabling the collar to spin off the shank portion.

Growing community of inventors

Quail Valley, CA, United States of America

Alan R Myers