Buckles – buttons – clasps – etc. – Combined diverse multipart fasteners – Hook
Patent
1999-02-10
2000-07-04
Brittain, James R.
Buckles, buttons, clasps, etc.
Combined diverse multipart fasteners
Hook
294 822, 24265H, F16L 4500, A44B 1100
Patent
active
060819758
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a hook for webbing comprising a metal rod bent in a single piece having an upper cross piece intended for receiving a webbing, said cross piece transforming into two legs which converge from opposite ends thereof, so as to form a loop part together with the cross piece and at least one of which transforms into a curved portion for forming a lower hook part. In practice, such hooks are made with two approximately equally long curved rod portions, which together form a lower hook part.
PRIOR ART
Hooks of the above-mentioned kind constitute a mass-produced article which is used in combination with different kinds of webbing, for instance ties and straps (see e.g. SE 9602524-2), more precisely with the purpose of enabling fastening of the webbing in holders, e.g. rings, hooks or the like, on trail cars, platform bodies, etc. Out of competition, it has always been an ambition to manufacture these hooks at a cost being as low as possible. An important factor for keeping the manufacturing cost down as much as possible is that the hook is made in one single piece of a rod blank, more precisely by bending the blank in a machine and then harden it (in some embodiments it also occurs that two curved portions of the proper hook part are welded together by spot welding). Previously known hooks for webbing made of one single rod piece has usually been designed with two identical, although mirror-inverted side halves, more precisely of a genuine round rod, i.e. a rod having circular cross-sectional shape along the entire length thereof, the two curved rod portions forming the hook part being put side by side next to each other. Crucial for the dimensioning of each individual standard type of hook is primarily the flexural rigidity of the hook part. Namely, if the two curved rod portions which together form said hook part would be under-dimensioned relative to a predetermined loading capacity (=rated load), there is a risk that the hook part is straightened when the webbing together with the hook are loaded maximally. Another important factor for the dimensioning is constituted by the flexural rigidity of the cross piece connected to the webbing. If said cross piece becomes too weak relative to the length thereof it may sag at maximum load and thereby deform the hook in its entirety. Previous attempts made in order to reduce the manufacturing cost for such hooks for webbing have generally been focused on reducing the rod diameter to an absolute minimum value considering current security regulations as well as maximising the inherent structural strength of the material by suitable choices of material and refining the hardening and finishing methods. However, these attempts have not in practice led to any radical cost reductions.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at reducing the material consumption in connection with the manufacture of hooks for webbing of the above-mentioned type, and thereby lowering the total cost of the production of the same significantly. Thus, a primary object of the invention is to provide a hook for webbing, which, by the geometrical shape thereof, allows the use of minimal quantities of rod material for a given loading capacity, at the same time as the cross piece of the hook does not run the risk of sagging or deforming when the webbing together with the hook are subjected to a maximum load. Thus, for a hook with a predetermined loading capacity, a rod blank having considerably smaller cross-section than a corresponding round rod blank in conventional hooks for webbing should be possible to use, without the proper hook part tending to straighten out at maximum load.
According to the invention, at least the primary object is attained by the features defined in the characterizing clause of claim 1. Preferred embodiments of the invention are furthermore defined in the dependent claims.
BRIEF DESCRIPTION OF THE APPENDED DRAWINGS
In the drawings:
FIG. 1 is a perspective view showing a hook according to the inven
REFERENCES:
patent: 411857 (1889-10-01), De Long
patent: 1300078 (1919-04-01), Widstand
patent: 1466615 (1923-08-01), Falstrault
patent: 1499932 (1924-07-01), Jacobson
patent: 1740847 (1929-12-01), Wehringer
patent: 2856663 (1958-10-01), Elsner
patent: 3046630 (1962-07-01), Morrissey
patent: 5832572 (1998-11-01), Norrby
Brittain James R.
Sandy Robert J.
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