Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection – Frangible connection
Patent
1995-05-16
1997-11-18
Lindsey, Rodney M.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Torque responsive nut or bolt driving connection
Frangible connection
411238, 411931, F16B 3912, F16B 39284, F16B 3930, F16B 3938
Patent
active
056880880
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a torque nut or torque screw, i.e. a fastening device with fastening threads, i.e. threads which are operative for the fastening function of the device and with an indication means which is integrated in the device to be released at a predetermined tightening torque, comprising an inner fastening member having said fastening threads and outside of the inner fastening member an outer female member rotatable by means of a spanner, a pair of pliers, a screw driver, or other tool, said female member being connected to the inner fastening member by means of a coupling having a sufficient strength to transfer to the inner fastening member a torque of the magnitude for which the fastening device is designed, and wherein the outer female member is provided, at the tightening of the coupling, to be released and rotated relative to the inner fastening member but not until the predetermined torque is exceeded.
BACKGROUND OF THE INVENTION
It is in many situations desired to be able to tighten nuts and screws with a certain predetermined torque. For this purpose special-type tools have been designed which are released or which are provided with a signalling device, which is released when a set torque has been achieved. These tools, however, are comparatively expensive and are not at hand in normal tool kits. Therefore, there is a need for torque nuts and torque screws which can be tightened by means of conventional tools, such as conventional spanners, pliers, screw drivers and the like, wherein the torque nut and the torque screw, respectively, shall be able to take over the releasing or indication function of the dynamometric tool (torque tool).
BRIEF DISCLOSURE OF THE INVENTION
The purpose of the invention is to provide torque nuts and torque screws which can take over the "indication function" of the dynamometric tool, i.e. which can be tightened with a predetermined torque by means of a conventional tool. This can be achieved therein that the coupling between the outer female member and the inner fastening member consists of a conical screw coupling.
The predetermined torque can be set by a certain tightening of the screw coupling. The outer female member consists of a nut according to a first preferred embodiment of the invention, wherein the predetermined torque is set by a certain tightening of the screw coupling between the outer nut and the inner fastening member. The inner fastening member also may consist of an inner nut, wherein the inner nut, according to an embodiment, may be longer than the outer nut and extend between the outer nut in its two ends.
Further, according to a preferred embodiment, the inner fastening member may have an outwardly directed flange or other abutment means in its outer end, against which abutment means the outer nut is tightly screwed with such a force that the joint between the outer nut and the inner fastening member can be released only by the application of said predetermined torque. The outer end of the inner fastening member, which preferably is designed as a flange, further may have a hexagonal outer cross-section in order to provide lands for a wrench for easing off the inner fastening member when the joint shall be undone. The inner fastening member may also be provided with a hex socket for an Allen key or with grooves for a screw driver in its outer end.
According to a modified embodiment, the fastening member comprises a head designed as a nut with conical threads, the imaginary point of the cone being directed away from the fastening threads of the fastening member. In the said head there is a screw having conical threads cooperative with the conical threads in said head, wherein said screw having conical threads is rotatable by means of a spanner, a pair of pliers, a screw driver or other tool. According to the same principles as for the above described embodiments, said screw having conical threads is joined to the fastening member by a certain tightening of the conical screw joint in order to transfer, to the faste
REFERENCES:
patent: 370168 (1887-09-01), Truxal
patent: 824983 (1906-07-01), Farrington
patent: 1652169 (1927-12-01), Fleming
patent: 3667339 (1972-06-01), Dame
patent: 3841177 (1974-10-01), Watterback
Bednarek Michael D.
Excelsior Development Inc.
Lindsey Rodney M.
Santos Robert G.
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