Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Internally threaded fastener element – e.g. – nut – etc. – Multipart
Patent
1996-12-16
1998-07-07
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Internally threaded fastener element, e.g., nut, etc.
Multipart
411437, 411527, F16B 3708, F16B 3716
Patent
active
057758620
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a threaded device. More specifically, the invention provides an improvement in threaded devices designed for engagement with a threaded screw upon insertion of the screw in the axial direction thereof.
In one aspect, the invention provides a threaded device for receiving an externally threaded screw, the device having an engaging portion which is biased to a position at which it threadedly engages the screw when received in the device, but movable against said bias under engagement by, and axial movement of, the screw with respect to the device, to enable the screw to pass the engaging portion without rotating the screw.
SUMMARY OF THE INVENTION
Preferably, the engaging portion is resiliently biased to said position.
The engaging portion may comprise a leaf spring.
Preferably, there is more than one engaging portion. For example, there may be two, three or four engaging portions arrayed about the location of the axis of the screw when received by the device.
The free end of the or each engaging portion may be part threaded for threadedly engaging the screw. Where there is more than one engaging portion, each may have a part threaded free end, the free ends being configured so as, together, to substantially fully circumferentially and threadedly engage the screw when threadedly received by the device.
The device may have a base portion having an opening through which the screw may extend to be engaged by the or each engaging portion. Where the engaging portions are provided as leaf springs, the leaf springs may be secured to a rear face of the base member, the screw in use being passed through the opening from a front face of the base member to be engaged by the engaging portions.
Where the engaging portions are in the form of leaf springs, these may extend from locations at which they are fixed to the rear face, inwardly towards the axis of the screw member when received, and rearwardly from the locations where they are fixed to the rear face, to free end portions which in use engage the screw. The or each engaging portion may be movable in the rearward direction away from said rear face when engaged by the screw for movement to the position at which axial movement of the screw therepast is permitted without rotating the screw. The free ends may also be movable in the opposite direction, towards the rear face, under screwing up action of the screw so that, for example, the or each portion is substantially flush with the rear face when the screw is tightened.
The invention is particularly, but not exclusively adaptable for use in connection with brackets for fixing of electrical fittings such as power points and switches.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a rear perspective view of a bracket for fixing of electrical equipment;
FIG. 2 is an enlarged fragmentary view of a rear part of the bracket, showing a threaded device formed in accordance with the invention;
FIG. 3 is a view like FIG. 2 but showing a front part of the bracket;
FIG. 4 is a plan view of a spring element incorporated into the threaded device of FIG. 2;
FIG. 5 is a lengthwise cross section of the spring element of FIG. 4;
FIGS. 6 to 9 are cross sectional views illustrating the operation of the threaded device of FIG. 2;
FIG. 10 is a plan view of the bracket of FIG. 1 in use, prior to fixing of a switch thereto;
FIG. 11 is a view like FIG. 10, but showing a final fixed state of the bracket.
FIG. 12 is a view like FIG. 2, but showing a modified threaded device formed in accordance with the invention; and
FIGS. 13 and 14 are views like FIGS. 6 and 7 respectively but illustrating the operation of the modified threaded device of FIG. 12.
DETAILED DESCRIPTION OF THE DRAWINGS
The bracket 10 shown in FIG. 1 is formed of sheet metal having a major portion 12 of generally planar form and a planar end portion 14, formed by bending from a metal blank. As shown in FIG. 11
REFERENCES:
patent: 2279169 (1942-04-01), Kost
patent: 2373312 (1945-04-01), Hughes
patent: 2377694 (1945-06-01), Judd
patent: 2401672 (1946-06-01), Tinnerman
patent: 3037221 (1962-08-01), Lanius, Jr.
patent: 3298270 (1967-01-01), Launay
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