Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection
Patent
1997-06-30
1999-01-12
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Torque responsive nut or bolt driving connection
411 5, 411396, F16B 3100
Patent
active
058578161
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a fastening element with a torque-limiting function, comprising on the one hand a fastening member with working threads, that is to say threads which are active for the fastening function of the element, and on the other hand a gripping member which is arranged so as to be capable of being turned with the aid of a spanner, wrench, screwdriver or other tool for attaching the fastening element and connected or connectable to the fastening member via a torque-transmitting threaded connection with sufficient strength in order to be capable of transmitting to the fastening member torque of the size for which the fastening element is intended, and in which the gripping member is arranged to be unscrewed and turned relative to the fastening member, on attachment of the fastening element, only when the torque exceeds a given predetermined torque.
STATE OF THE ART
Fastening elements of the type indicated above are known from e.g. SE 365589 and SE 467797.
BRIEF DESCRIPTION OF THE INVENTION
The aim of the invention is to make available a fastening element which is improved in relation to known technology. More precisely, the invention aims to make available a fastening element which has at least one of the following improvements in relation to known technology: surface in relation to the cross-section of the fastening member, relatively small in relation to the cross-sectional dimensions of the fastening member and/or of view.
At least on of these and other aims can be achieved with a fastening element which is characterized by what is indicated in the following patent claims. Further characteristics and aspects of the invention emerge from the following description of preferred embodiments.
SHORT DESCRIPTION OF THE FIGURES
In the following description of preferred embodiments, reference will be made to the attached drawing figures, in which
FIG. 1 represents a side view of a torque screw together with a gripping member according to a first preferred embodiment of the invention,
FIG. 2 shows a modified embodiment of the fastening element according to FIG. 1,
FIG. 3 shows a side view, partly in section, of a fastening element according to a second preferred embodiment of the invention,
FIG. 4 represents an end view IV--IV in FIG. 3,
FIG. 5 shows a side view, partly in section, of a third preferred embodiment of the invention, where the gripping member and the fastening member are two separatable elements, and
FIG. 6 and
FIG. 6A show a variant of the device according to FIG. 5.
DESCRIPTION OF PREFERRED EMBODIMENTS
With reference first to FIG. 1, a fastening element is designated generally with the number 1. It consists of a fastening member in the form of a fastening screw 2 and a gripping member in the form of a torque nut 3. At one end, the fastening screw 2 has normally right-hand threaded working threads 4, i.e. threads which are active for the fastening of the element, and at the other end is a screw head 9. On the screw head 9 there are torque-transmitting outer threads 5 which are left-hand threaded and in the torque nut 3 there are corresponding torque-transmitting left-hand threaded threads 6. Between the region of the working threads 4 and the screw head 9 there is a flange 7 designed as a hexagonal gripping piece. At the same time, the gripping piece 7 functions as a stop and has on its underside a relatively large stop surface 8 intended to be pressed against the object which is to be fastened with the aid of the fastening element.
The screw head 9 is conical like the inside of the torque nut 3 and consequently also the threads 5, 6. The conicity is such that the imaginary point of the cone faces in the direction away form the working threads 4. The angle of inclination has been designated v.
The fastening element 1 thus described functions in the following manner. The torque nut 3 has at the manufacturer's been screwed firmly on the screw head 9, so hard that a given defined torque is required in order to be capable of unscrewing the torque nut 3 from t
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Anglo Dutch International Finance N.V.
Bednarek Michael D.
Maduro & Curiel's Trust Company N.V.
Saether Flemming
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