초록 ▼

Apparatus for assembly with a bolt or screw upon installation thereof to prevent tampering therewith, including a one piece collar device having an outer annular jacket member with a restricted collar portion and an inner annular washer member detachably joined to the jacket member at the collar por

Apparatus for assembly with a bolt or screw upon installation thereof to prevent tampering therewith, including a one piece collar device having an outer annular jacket member with a restricted collar portion and an inner annular washer member detachably joined to the jacket member at the collar portion by a frangible diaphragm. The stem of a bolt or screw is inserted through the collar device and tightened into engagement with the collar portion to cause shearing of the diaphragm to separate the washer and jacket members, the washer member being of a larger axial dimension and smaller radial dimension than the collar portion to permit the jacket member to rotate freely about the bolt or screw and the washer member when the enlarged fastener head is tightened into clamping engagement with the washer member. A cap member fits snugly in the free end of the jacket member to enclose the fastener head. Thus, the fastener head cannot be frictionally clamped by gripping the exterior of the rotatable jacket member to deter tampering with the fastener.

대표청구항 ▼

Apparatus for assembly with a fastener of the type having a stem and an enlarged head during use of said fastener for deterring and detecting tampering therewith, said apparatus comprising annular collar means for extension therethrough of said fastener stem and for disposition adjacent the undersid

Apparatus for assembly with a fastener of the type having a stem and an enlarged head during use of said fastener for deterring and detecting tampering therewith, said apparatus comprising annular collar means for extension therethrough of said fastener stem and for disposition adjacent the underside of said fastener head in assembly with said fastener and closure means adapted to mate with said collar means for cooperatively enclosing said fastener head to deter access thereto, said collar means including an outer annular collar member having an annular collar portion, an inner annular washer member, and frangible means connecting said collar member and said washer member and adapted to break to detach said collar member and said washer member from one another under force of engagement of said fastener head with said collar means upon installation of said fastener in assembly with said collar means, said washer member being of a greater axial dimension than said collar portion for installed engagement of said fastener head with said washer member to permit said collar member to rotate freely about said fastener and said washer member, thereby preventing removal action frictionally upon said fastener by action upon said collar member.