Fastener bolt with limited torque head
OwnerCarl Grunbichlerinventor
Life of this patent
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Abstract
A non-removable, tamper-proof bolt has a threaded shaft, a permanent head, and a torque head which is sheared off from the assembly when the bolt is fastened. The shaft has an opening formed therein at the forward screw end, and the opening has a profile for engagement with a torque tool. The torque head is formed with a hole as well which extends through the entire torque head coaxially with the threaded shaft. The torque head is attached to the permanent head by the intermediary of a bridge defined around said hole in the torque head. Once the torque head is sheared off, the bolt cannot be turned until the opening formed in the forward screw end is exposed by drilling through the shaft from the permanent head inwardly.
Claims13
A tamper-proof bolt, comprising:
- a threaded shaft with a first end and a second end, said shaft defining a longitudinal bolt axis;
- a permanent clamping head formed on said first end of said threaded shaft;
- said threaded shaft having a blind opening formed therein at said second end thereof, said opening extending along said axis and being formed with a profile for engagement with a torque tool;
- and
- a torque head formed on said permanent clamping head, said torque head having a hole formed therein, said hole extending through said entire torque head and partially into said permanent clamping head coaxially with said threaded shaft and with said opening in said second end of said shaft;
- said torque head being attached to said permanent head by the intermediary of a bridge defined around said hole in said torque head.
Dependencies are inferred from the claim text.