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US 4,358,941 AGranted
Security method and apparatus
OwnerJohn C. Zimmerinventor
Life of this patent
Estimating the term…
Abstract
Disclosed is a security device and method. The device includes a bolt having a first hole drilled radially therein, a second threaded hole drilled axially therein to intersect the first hole, and a third hole formed axially therein connecting the second hole with the end of the bolt. A bar is insertable into the first hole to extend radially outside the bolt thereby to prevent a nut from being removed from the bolt. The bar is secured in the bolt by means of a pick-proof lock that has a screw portion threadably engagable with the second hole to engage the bar, and a lock body configured to fit the third hole.
Claims1
A security device, which comprises:
- a cylindrical bolt having formed therein a radial first hole substantially perpendicular to the axis of said bolt, a threaded second hole formed coaxial with said bolt and intersecting said first hole, and a third hole formed coaxial with said second hole and connecting said second hole with the end of said bolt, said third hole having a flat side;
- a nut threadably engageable with said bolt;
- a bar insertable into said first hole, said bar having a length long enough such that an end thereof extends radially outside said bolt when said bar is inserted in said first hole, said bar having a notch therein alignable with said second hole when said bar is inserted in said first hole;
- and a key-operable pick-resistant lock including a lock body conformed to fit said third hole and a key-operable screw engageable with said second hole, said screw including key-releasable lock structures and being adapted to screw into said second hole to engage said notch of said bar.
1 more element
Dependencies are inferred from the claim text.