Buckles – buttons – clasps – etc. – Cord and rope holders – Chain
Patent
1997-04-07
1999-05-25
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Cord and rope holders
Chain
24370, 246821, F16G 1500
Patent
active
059060328
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a coupling link to be interconnected between a hoisting means and a shortenable hoisting chain. Such a coupling link may, e.g., be used for interconnection of a ring or the like at the end of a chain, hanging down from a hoisting crane, and a shortenable hoisting chain, which is provided with a lifting hook at its other end. It is desirable to adjust the effective length of the hoisting chain, e.g., for adjustment of the vertical position of the lifting hook, so that a load can be suspended, or for applying a hoisting chain loop around the load.
A coupling link of this kind is previously known from WO 83/03649 (Parsons Controls Ltd) and comprises a connection portion for connection to the hoisting means, and an anchoring portion for anchorage of an end link of the hoisting chain. Furthermore, the coupling link, which is denoted "shortening clutch" in said publication, comprises two support shanks with an intermediate support slot for receiving a selected hoisting chain link, in the following denoted "support link", wherein a hoisting chain link adjoining the support link, denoted "engagement link", engages, at an end portion thereof, with corresponding seating surfaces formed in the support shanks. Thus, the hoisting chain will be secured in a shortened configuration in the coupling link.
However, the previously known coupling link has a number of drawbacks. When it is to be connected to a hoisting means, such as a ring-shaped larger link, denoted "main link" in the publication, one has to use a shackle, the pin of which is inserted through a connection eye in the upper part of the coupling link, as well as another coupling link, at least in case two or more shortening coupling links are to be interconnected with the main link.
Furthermore, in the previously known coupling link, the connection eye for said shackle pin, the corresponding connection eye for anchorage of the end link of the hoisting chain and said support shanks are situated at the corner points of an imaginary, substantially regular triangle. The support shanks are arranged in such a way that the support and engaging links of the hoisting chain are freely accessible from the outside when handling and loading the coupling link. This will involve a risk for these links to be detached from engagement under the influence of hits and blows, or to be deformed and get stuck, or for the links and/or the support shanks to break when being handled roughly. The above mentioned triangular configuration will also bring about a substantial inclination of the coupling link when the load is shifted from the end link to the engagement link of the hoisting chain.
The previously known coupling link also involves a voluminous and heavy structure which makes the manufacture complicated and expensive.
The object of the present invention is therefore to accomplish a coupling link, of the kind defined in the preamble of appended claim 1, which requires fewer or no coupling members for interconnection with a hoisting means, which secures a protected positioning of the support and the engagement links of the hoisting chain in engagement position and which has a simple and light weight structure. The coupling link shall also be easy to handle and be useful in many different applications. It should also enable manufacture thereof by conventional technology at low cost. Preferably, the structure should be such that the coupling link is only slightly inclined when being loaded, if at all.
According to the invention, these objects are achieved in that the coupling link is elongated and comprises a first end portion formed as a loop portion, which constitutes said connection portion, a mid portion, which is provided with said support shanks and said support slot, and a second end portion, which constitutes said anchoring portion, wherein said loop portion defines a free interior space, which is dimensioned to enable pulling through the hoisting chain for adjustment of its effective length and which directly adjoins said support slot of said mid porti
REFERENCES:
patent: 419725 (1890-01-01), Snyder et al.
patent: 919699 (1909-04-01), Davis
patent: 1889633 (1932-11-01), Butterworth
patent: 2165377 (1939-07-01), Henry
patent: 2519980 (1950-08-01), Renz
patent: 2637591 (1953-05-01), Maxfield et al.
patent: 4149369 (1979-04-01), Smetz
Frenolink Forvaltnings AB
Sakran Victor N.
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