Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Securing means pivotable about axis transverse to fastener...
Patent
1993-04-30
1994-07-19
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Securing means pivotable about axis transverse to fastener...
411 21, 411345, F16B 2100
Patent
active
053303032
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for fastening at least two members to each other.
More particularly, the invention relates to devices for fastening two members using a screw and a transfer nut which are adapted in order to engage in recesses in the said members.
Devices of this type are already known in the state of the art, for example from document FR-A-2,351,297, in which the transfer nut is fixed to the end of branches of a fastening member, these branches being deformable during tightening of this nut onto the screw in order to abut against a bearing surface of one of the members in order to hold this nut in position and to fix the members together.
However, these devices have a number of drawbacks, owing to the complexity of their structure and to their cost.
A cap nut is also known in the state of the art, for example from document FR-A-1,429,545, consisting of a body forming the nut proper, which is internally threaded, and by an elastic cage of small thickness, characterised in that the cage has expandable elastic lugs arranged and shaped so as to engage in recesses or notches made in a flange of the body of the nut and to produce anchoring on the edge of the hole by virtue of the axial displacement of this body of the nut when the latter is tightened, the point of curvature of the tabs carried by the cage being situated towards the outside at a distance from the hole of the cage intended for the screw such that the tabs are inclined and diverge in the direction of the body of the nut, the diameter of their periphery being, in the untightened state, tests less than the diameter of the hole.
However, this cap nut has a number of drawbacks, because it does not remain in position when the screw is removed.
SUMMARY OF THE INVENTION
The aim of the invention is therefore to solve these problems by providing a fastening device which is simple, reliable, easy to use, and whose cost price is as low as possible.
For this purpose, the subject of the invention is a device for fastening at least two members to each other, using a screw and a transfer nut which are adapted to engage in recesses in the said members, characterised in that the transfer nut comprises a nut plate comprising a tapped hole, on either side of which are made zones for passage of two branches of an attachment member with a cross-section of general flared U shape, whose intermediate portion comprises a hole for the screw, facing the tapped hole in the nut plate, and is adapted to bear against a stop surface of the screw or of the member on which this screw bears, so that the nut causes a separation of the branches of the member their abutment against a bearing surface of the other member during screwing, in order to fasten the members to each other.
Advantageously, the nut plate comprises two axially offset portions, an internal one in which the tapped hole is made, and an external one extending at least partly around the internal portion and adapted to abut against a bearing surface of the other member, opposite to that against which the branches of the attachment member abut, in order to allow positional holding of the nut by pinching of the other member between this external portion of the nut plate and the branches of the attachment member.
According to one embodiment, in the untightened position of the nut, each of the branches of the attachment member has, in succession from the intermediate portion of the latter, a first straight part moving away from the axis of the nut, a second part curved in the opposite direction from the axis of the nut and engaged in a corresponding passage zone of the nut plate, and a third part which is folded in the direction of the axis of the nut.
The invention will be better understood with the aid of the following description which is given solely by way of example and is made with reference to the attached drawings, in which:
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 represents a sectional view of a fastening device according to the invention, in the untight
REFERENCES:
patent: 499444 (1893-06-01), Schumann
patent: 3403594 (1968-10-01), Newell
patent: 4553889 (1985-11-01), Le Dantec et al.
Tech Industries
Wilson Neill R.
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