Tamper-resistant fastener
| DWPI Title: Tamper-resistant fastener for physical security application to delay adversary during attack of asset, has cap element that is not removable from slot in direction away from threaded fastener along first longitudinal axis of fastener |
| Abstract: A tamper-resistant threaded fastener including a circular head having a slot formed in the head transverse to the longitudinal axis, the slot having an enlarged region intermediate an apex and a base of the slot. A cap member includes a head having a drive feature formed therein, the head extending to a first shank portion, extending to an enlarged second shank portion, extending to a foot. The cap member is insertable in the slot only from a direction transverse to the longitudinal axis. During rotational installation of the fastener and cap member in a threaded counterbored opening for securing a barrier for protecting an asset, the foot shears inside the slot at a predetermined rotational drive force, the cap member being rotatable in the opening and protectively covering the fastener head. |
| Use: The fastener for providing tamper-resistance protection for an asset. |
| Advantage: The fastener makes removal of the fastener more difficult and time-consuming. |
| Novelty: The fastener has an enlarged second shank portion that is receivable in an enlarged region. A foot is receivable in a slot between the enlarged region and a base. The foot abutting the slot and preventing a rotation of a cap element relative to the slot for urging a threaded fastener to threadedly engage a threaded counterbored opening until an end portion shearing at a predetermined rotational drive force in response to insertion of the cap element in the slot of the threaded fastener and a shank of the threaded fastener alignedly positioned in the threaded counterbored opening for securing a barrier for protecting an asset and application of a rotational drive force to a drive feature of the cap element. The cap element is rotatable in the threaded counterbored opening and protectively covering a head of the threaded fastener. The cap element is not removable from the slot in a direction away from the threaded fastener along a first longitudinal axis of the threaded fastener. |
| Filed: 10/22/2018 |
| Application Number: US16166463A |
| Tech ID: SD 14289.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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