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Tamper reistant fastener
| Details |
Inventors: Hampson, Kip; Ivanochko, Todd; Young, Linda;
Assignee: Pinhead Components Inc. (Edmonton, CA)
Primary Examiner: Saether; Flemming
Assistant Examiner:
Attorney, Agent or Firm:
A tamper resistant fastener, which can only be rotated with a specific key, is described. The fastener includes a head for rotation about a vertical axis. The head is provided with the least two cutouts in the head of the faster spaced away from the vertical axis, the cutouts having a discontinuous sidewall. The side wall of each of the cutouts has a first generally vertical engaging surface for engagement by a mating member on a specific key for clockwise rotation of the head about the vertical axis and a second generally vertical engaging surface for engagement by the mating member on the specific key for counter clockwise rotation of the head about vertical axis. The side wall of the cutout is interrupted adjacent the second engaging surface to prevent engagement by a tool other than the specific key and thereby prevent rotation of the fastener in a counter clockwise direction by a tool other than the specific key. |
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DETAILED DESCRIPTION In a preferred embodiment, the present invention provides a tamper resistant fastener which can only be rotated with a specific key.
The fastener includes a head for rotation about a vertical axis.
The head is provided with the least two cutouts in the head of the fastener spaced away from the vertical axis, the cutouts having a discontinuous sidewall.
The side wall of each of the cutouts has a first generally vertical engaging surface for engagement by a mating member on a specific key for clockwise rotation of the head about the vertical axis and a second generally vertical engaging surface for engagement by the mating member on the specific key for counter clockwise rotation of the head about vertical axis.
The side wall of the cutout is interrupted adjacent the second engaging surface to prevent engagement by a tool other than the specific key and thereby prevent rotation of the fastener in a counter clockwise direction by a tool other than the specific key.
In an aspect of the invention, the head has an upper convex surface extending to a bottom surface.
In another aspect of the invention, the head is provided with three cutouts spaced around the periphery of the head.
In yet another aspect of the invention, the cutouts have a generally circular mating member receiving recess, the discontinuous side wall being formed by removing material form the head adjacent the second generally vertical surface.
The mating members of the key are generally circular projections extending downwardly from the lower surface.
Yet another aspect of the invention provides for a tamper resistant fastening system comprising a tamper proof fastener for attaching objects, the tamper proof fastener having a head for rotation about a vertical axis, and a specific key for rotating the fastener.
The head of the fastener is provided with at least two cutouts spaced away from the vertical axis, the cutouts having a discontinuous sidewall.
The side wall of each of the cutouts has a first generally vertical engaging surface for engagement by a mating member on the specific key for clockwise rotation of the head about the vertical axis and a second generally vertical engaging surface for engagement by the mating member on the specific key for counter clockwise rotation of the head about vertical axis
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