Chain – staple – and horseshoe making – Chains – Attachments
Patent
1996-06-11
1998-03-10
Jones, David
Chain, staple, and horseshoe making
Chains
Attachments
294 821, 24116R, F16G 1700
Patent
active
057248044
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a double-pronged shortening claw having two hooks which are connected to one another via a back, are arranged essentially parallel to one another and, in the area of their prongs defining an insertion slot for a link of a chain strand, form a pocket for accommodating and supporting a chain link which follows the chain link inserted into the insertion slot, is arranged essentially perpendicularly to the plane of the insertion slot and, to prevent it from hanging undesirably out of the pocket, is secured by a securing element forming a stop for the nose of the chain link inserted into the insertion slot.
Shortening claws of the above type are exceptionally robust and permit not only rapid but also safe shortening of chain strands used for lifting heavy loads, the safety being determined substantially by the receptacle, designed as a pocket for the chain link, put into it in each case, of the shortened chain-strand section. DE 27 12 605 C 2 discloses a shortening claw of the generic category considered, which has a fork head at its end remote from the pocket, which fork head consists of two parallel legs having aligned transverse bores for accommodating a retaining bolt for the end link of a chain-strand section. The fact that the known shortening claw can only be attached to the end link of a chain strand restricts or impedes its possible uses at least inasmuch as there is generally no option in practice, at least in the case of chain suspension attachments, but to connect the chain strand to be shortened to the end link, to which the shortening claw is fastened, of the chain-strand section by an additional coupling element, in which arrangement the end link, to avoid disadvantages which result from its connection to both the shortening claw and the coupling element, has to be designed as a special link having an enlarged inside width compared with the other chain links.
In addition, DE-U-69 03 899 discloses a shortening strap having an essentially L-shaped basic body, the longer leg of which is provided with a bore for the captive attachment of a chain link and with a pull-through opening for a chain strand to be shortened, and the shorter leg of which, on the other hand, has a slot which leads into the pull-through opening and whose side walls serve to support the nose of a chain link of the chain strand to be shortened. In this case, the end of the chain strand which can be shortened and the chain link put into the bore in the shortening strap are connected to a special link, the dimensions of which deviate from the dimensions of the links of the chain strand. On account of the arrangement described, the known shortening strap is not suitable for connecting so-called loose chain-strand ends, which is possible in principle when using a fork-head attachment of the type disclosed by DE-C-27 12 605.
Finally, a shortening claw is known which is suitable both for shortening continuous chain strands and for quickly and temporarily connecting the ends of two chain-strand sections. In this design disclosed by U.S. Pat. No. 3,729,926, a circular pull-through opening is arranged in the straight claw back above a first receptacle, formed by hooks arranged parallel to one another, for a chain link, adjoining which pull-through opening is a slot whose end remote from the pull-through opening is formed by a cross yoke against which the longitudinal leg of a link of a chain strand passed through the pull-through opening is supported, in which arrangement neither the type of support of the chain link nor the type of chain-strand guidance of a continuous chain strand to be shortened is able to provide satisfaction.
The object of the invention is to design a shortening claw of the type considered in such a way that, while dispensing with additional coupling elements for the chain strand to be shortened, it can be installed at a freely selectable point of a chain strand, even of a continuous chain strand. In the case of a shortening claw of the generic type, this object is achieved according to the i
REFERENCES:
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patent: 3729926 (1973-05-01), Buske
patent: 3863441 (1975-02-01), Kaufmann
patent: 4151708 (1979-05-01), Smetz
patent: 4330990 (1982-05-01), Schreyer
patent: 5309706 (1994-05-01), Lasaroff et al.
Jones David
RUD-Kettenfabrik Rieger & Dietz GmbH.u.Co.
Stone Mark P.
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