Limiting torque bolt-nut assembly
First Claim
Patent Images
1. A torque limiting bolt-nut assembly comprising:
- a bolt having a threaded shank;
a secondary drive head on said shank;
a shearable primary drive head on said secondary drive head; and
a hollow drive nut over said primary and secondary drive heads and a portion of said shank, said drive nut being adapted to turn said primary drive head and being rotatable relative to said secondary drive head and said shank.
1 Assignment
0 Petitions
Accused Products
Abstract
A limited torque bolt-nut assembly including a bolt shank having a threaded first end portion and a non-threaded second end portion, a secondary drive head on the second shank portion and a primary shearable drive head on the secondary drive head, and a hollow nut secured over both drive heads and a portion of the non-threaded shank section. The hollow nut drives the primary drive head which rotates relative to the secondary drive head until the primary drive head shears off at a predetermined torque releasing the nut and primary drive head. The secondary drive head remains on the bolt shank for adjustment and removal of the bolt.
47 Citations
12 Claims
-
1. A torque limiting bolt-nut assembly comprising:
-
a bolt having a threaded shank; a secondary drive head on said shank; a shearable primary drive head on said secondary drive head; and a hollow drive nut over said primary and secondary drive heads and a portion of said shank, said drive nut being adapted to turn said primary drive head and being rotatable relative to said secondary drive head and said shank. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A limited torque bolt-nut assembly comprising:
-
a bolt shank having a threaded first end portion and a cylindrical non-threaded second end portion; a secondary drive head on said second shank portion; a shearable primary drive head on said secondary drive head; a rivet on said primary drive head; and a hollow drive nut over an end portion of said second shank portion, said secondary drive head, said primary drive head, and said rivet, said nut having a central end hole in a first end thereof receiving said rivet for holding said nut on said bolt, a first cylindrical cavity opening through the opposite end of said nut larger than said secondary drive head and said non-threaded shank portion and rotatable relative to said secondary drive head and said non-threaded shank portion, and a second cavity opening at one end to said first cavity and at the opposite end to said rivet hole, said second cavity being configured to closely fit around said primary drive head for turning said primary drive head responsive to rotation of said nut, said nut having outside drive faces for engagement by a wrench. - View Dependent Claims (9, 10, 11, 12)
-
Specification