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Torque Lock Fastener

IP.com Disclosure Number: IPCOM000062711D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Bauman, AH: AUTHOR [+2]

Abstract

A technique is described whereby a screw fastener is fabricated in such a way as to enable the fastener to be used to secure various parts without the need of tools to provide vibration-resistant fastening. The screw fastener, known as a tensionlock fastener (TF), consists of cap screw 1, spring washer 2, operating cam or bail 3, and retaining enclosure 4, as shown in Fig. 1 with the TF in the unlocked position and in Fig. 2 with the TF in the locked position. Cap screw 1 may be replaced with a standard nut 5, as shown in Fig. 3, to mate with any matching screw thread fastener 6. In Fig. 2, nut 7, shown mating with cap screw 1, is a self-clinching nut, but could be any type of standard thread nut. In Fig.

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Torque Lock Fastener

A technique is described whereby a screw fastener is fabricated in such a way as to enable the fastener to be used to secure various parts without the need of tools to provide vibration-resistant fastening. The screw fastener, known as a tensionlock fastener (TF), consists of cap screw 1, spring washer 2, operating cam or bail 3, and retaining enclosure 4, as shown in Fig. 1 with the TF in the unlocked position and in Fig. 2 with the TF in the locked position. Cap screw 1 may be replaced with a standard nut 5, as shown in Fig. 3, to mate with any matching screw thread fastener 6. In Fig. 2, nut 7, shown mating with cap screw 1, is a self-clinching nut, but could be any type of standard thread nut. In Fig. 1, bail 3 is positioned to allow the user to tighten the screw, then swivel the bail 90 degrees so that it is out of the way, as shown in Fig. 2. Cam surface 8, located at the ends of bail 3, provide cam compression against spring washer 2 so that the required tension can be applied to the screw. This controls the fastening force applied to the parts when the TF is in the locked position, as shown in Fig.
4. Bail 3 swivels more than 90 degrees from the unlocked position and requires maximum force to lift the bail from the locked position. In case of extreme vibration, a shoulder adjacent to the closed bail may be used to prevent the TF from unscrewing. The amount of tension applied to the screw threads of cap screw 1 is controlled by the des...