2140523-A is referenced by 68 patents and cites 10 patents.

A shear head screw 10 (Fig. 3) comprises a first (screw) head 14A and a second head 14B coupled by a shear neck 16 so that the screw can be tightened by the first head 14A until the screw shears at the neck 16 leaving the second head 14B and a threaded stem 12 tightened to a predetermined torque determined by the shear force. The screw thus applied can subsequently be loosened by the second head 14B. A shear head adaptor 108 (Fig. 19) comprises a socket 112 drivingly engageable with the screw head 106, and a drive head 114 coupled by a shear neck 116 to the socket 112.

Title
Shear head screws or bolts, or shear head adapter
Application Number
GB19840011265 19840502
Publication Number
2140523 (A)
Application Date
May 2, 1984
Publication Date
November 28, 1984
Inventor
Dent Roy
Assignee
Hepworth Electrical Developmen
IPC
F16B 31/02
F16B 31/00
F16B 31/02
View Original Source Download PDF