Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – With tighteners
Patent
1984-04-02
1985-11-26
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
With tighteners
24241P, 24241PL, 24232R, A44B 1300
Patent
active
045547122
DESCRIPTION:
BRIEF SUMMARY
This invention concerns safety hooks, and more peculiarly those that are doted with an articulated arm on to the body of the hook in its top part and opening externally from the hook according to FIG. 1.
The safety hook is held by the top part of the arm. When under tension, the hook is shut automatically, the free end of the arm coming into contact with the end of the hook and preventing the load from being unhooked accidentally.
This type of hook is used more and more, and especially in handling operations that offer the greater risks: i.e. Construction and building yards. This type of hook is simple, efficient and safe.
However, the most popular hooks that are now used have some drawbacks: the body of the hook supports the total load given to it and often more: In fact, when under tension, the free end of the arm is pressing on the end of the hook thus creating an extra downwards effort that is all the more important since the load is heavier (see drawing).
This effort is added to that of the load and make the kook bend out of shape when loaded. This requires, for an equal load, an overdimensioning of the working part (P) of the body of the hook, which is also the one where the constraints in the material are up to a maximum.
Such an overdimensioning of the hook leads to an increased weight making the hooks in the bigger calibers, heavy, bulky, and dangerous to handle.
One has tried to improve on these drawbacks for a long time.
The today's known improvement consists in a special shaping of the ends of the hook and of the arm so as to get the arm and the hook bound with each other when the device is shut.
Thus, the arm directly contributes in supporting part of the load and holds back the end of the body of the hook, prevents it from bending out of shape, and allows the lightening of the body of the hook.
See U.S. Pat. No. 1,449,364 to Gowan, or by new fastening devices under the same principle: cross-shaped hooking: U.S. Pat. No. 1,430,824 to Martin, or by a cone shaped end of the body of the hook coming into the hole of the end of the arm and combined with a locking system: U.S. Pat. No. 1,465,804, Bubb, or hook-shaped end of the body, and handle-shaped arm.
More recently, the improvements have been made essentially on the locking devices of the hooks, though still complying with the same fastening devices of the ends of the arm and of the body of the hook--U.S. Pat. No. 3,785,015 to Dorton.
The patents or projects for safety hooks offering a fastening device of the arm and the hook are quite many. In spite of that none of them has now been or is now largely spread most of them have been industrial or commercial failures.
Actually, they have disavantages: the shapes of the ends of the arm and of the hook used to fasten them are far too complex.
When put in an industrial process, they are difficult to realize and thus too costly.
Moreover, the principle used for these hooks is such that as soon as the hook is shut both ends come into contact which creates important constraints on the fastening device, when loaded. The fastening device is then opposed to the total load which consequently leads to increase the weight of the hook.
The advantage offered by these hooks is then far from being obvious, and it explains why they have not yet completely replaced the traditional hooks.
The goal of the present invention is to find a solution to the disadvantages of these hooks. It aims to a better distribution of the constraints in the components of the hooks, to lower the weight of the hooks and to allow a less costly industrial fabrication, whilst ensuring an increased safety.
So the invention applies to safety hooks that are equiped with articulated arms on the top parts of the bodies, opening externally from the hook and doted with a fastening device of the free end of the arm, so that when loaded, the body of the hook could not bend out of shape prematurely. This fastening device is characterized by the contact of two flat faces composed as follows: one showing a perpendicular cylinder-shaped prominence perpe
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patent: 1441378 (1923-01-01), Selvidge
patent: 1465804 (1923-08-01), Bubb
patent: 1688176 (1928-10-01), Clark
patent: 1716997 (1929-06-01), Antoniow
patent: 1725609 (1929-08-01), Amos
patent: 4118840 (1978-10-01), Fengels
Plottel Roland
Sakran Victor N.
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