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
1990-11-05
1992-04-28
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, 411386, F16B 2100
Patent
active
051082403
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a means for anchoring in a cavity, which has a screw threaded over at least a portion of its length, on whose end to be anchored in a cavity a toggle is held so as to be rotatable between an insertion position aligned with the screw and a locking position crosswise on the screw.
Cavity anchors of this kind, which are also known as "toggle bolts," are known and serve for mounting relatively light workpieces and those subject to light external loads on hollow walls, e.g., finish walls hung at a distance from the actual solid wall, such as gypsum wallboard or the like, or walls constructed of hollow bricks containing air chambers. The screw of these toggle bolts, which as a rule is provided externally with a screw head, is screwed into a threaded bore in a short, transverse pin on which the toggle in the form of a piece of stamped sheet metal is pivoted such that it can be turned or tilted from an insertion position in which it lies against the screw to a locking position at right angles to the screw. The insertion of the toggle bolt into the mounting hole is performed in the above-mentioned insertion position, and the screw screwed into the threaded bore of the short pin is made so long that it can be inserted into the cavity to the depth necessary to allow the locking element to turn. After introduction into the mounting hole the toggle is then rotated 90.degree. to the locking position by manipulating the screw. The screw is then driven on into the hole until the screw head provided on its end outside of the bore, or a washer disposed under this head, comes in contact with a workpiece that is to be mounted on the hollow wall, the toggle being tightened against the inside surface of the hollow wall defining the cavity. In this manner a positive mounting of the toggle bolt is achieved, which exerts no radial spreading pressure on the wall of the mounting hole and thus produces a secure fixation of the workpiece to be mounted on the wall by means of the toggle bolt.
The invention is addressed to the problem of applying the principle of the toggle bolt to a cavity anchor suitable for mounting heavy loads and withstanding great stress, which will be so constructed that the rotation of the toggle from the insertion position to the locking position will be performed positively, without the need to perform time-consuming and unreliable manipulation thereof via the screw.
THE INVENTION
Setting out from a cavity anchor of the kind described in the beginning, this problem is solved by the invention in that the toggle is mounted for pivoting within a shackle consisting of a pair of parallel legs joined together by a transverse portion at its end remote from the toggle, that a threaded bore is provided in the transverse section into which the threaded front end of the anchor shaft is screwed, and that the toggle contains a threaded through-bore whose central axis is aligned with the longitudinal central axis of the anchor screw.
In a preferred embodiment of the invention, the toggle is constituted by an elongated piece of metal that is substantially rectangular in plan and also rectangular in cross section, and the free ends of the shackle overlap the lateral surfaces of the metal piece and hold it in a pivotable manner, and the threaded bore passes centrally through the central area of the metal piece at right angles to the pivot axis, from the top to the bottom flat side. Since the toggle in the form of the metal piece is mounted between the legs of the shackle, which, in the insertion position, extend beyond the front end of the anchor screw by the amount necessary to allow the toggle to rotate, it is possible to make the metal toggle relatively massive, so that in the locking position it will be able to spread heavy loads over a large surface area of the inside face of the hollow wall. After the toggle has been rotated to the locking position, the anchor screw is screwed into the threaded bore in the toggle, so that then any forces applied to the anchor screw
REFERENCES:
patent: 2609723 (1952-09-01), Stuggs
patent: 2916235 (1959-12-01), Nagel
patent: 3127807 (1964-04-01), Modrey
patent: 3248994 (1966-05-01), Mortensen
patent: 3288014 (1966-11-01), Mortensen
patent: 4232497 (1980-11-01), Meschnig
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