Ships – Mooring device – Line type
Patent
1998-06-25
2000-05-16
Basinger, Sherman
Ships
Mooring device
Line type
114213, 267 74, 267179, 267180, B63B 2100
Patent
active
060621575
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OVER THE INVENTION
The present invention relates to a spring means for hauling elements, such as ropes, especially ropes for anchoring boats.
RELATED ART
Elements which are exposed to tractive forces, such as ropes, chains, and pull-rods, are often equipped with a spring means to equalize the large forces which might occur if the element is exposed alternately to load removal and severe wrenching. Load removal which alternates with wrenching particularly occurs in moorings for boats and floating bridges due to movements of the water. If there is no elasticity in the force absorbing system, the wrenching can lead to forces so large that the mooring element, usually a rope or a chain, is torn or that its attachment is torn off.
For this reason it is common to equip such hauling elements with a spring means. A number of such spring means are known. A common spring means comprises a screw spring, which, through links which overlap each other, absorbs the wrenching as compressive forces. However, this kind needs a considerable amount of space, and also has a tendency to be noisy. Another known kind is in the shape of a rubber strap, which additionally has a safety device, due to the fact that the mooring line is wound about it at the same time as it is fastened to the outer ends of the strap. In this way it is possible to utilize the resilience of the rubber, while the unbroken rope ensures that the mooring does not break if the strap breaks due to material exhaustion. This device is handy to use, and has a small diameter, but its production costs are relatively high. There are also other kinds of such spring means, which might have other disadvantages. A common problem is how to attach the hauling element to the spring means in a safe way which is also easy to handle.
SUMMARY OF THE INVENTION:
The present invention uses a tension screw spring for the spring function, an element which can be produced in special machines without any large tool costs. The particular characteristics of the invention, a tension screw with two different diameters, a large diameter at the intermediate section, and a smaller diameter at the two end-sections, the springing movement between the turns of the spring can be positioned to the intermediate section while the two end-sections, which due to their smaller diameter have a larger spring constant, are not affected. Due to this fact, they can be used as attachment points for the hauling element.
THE DRAWINGS
In the following, the invention will be shown in a number of embodiments which are shown in the Figures:
FIG. 1 a view of an embodiment of a spring element;
FIG. 2 a cross section of the spring means, which shows the attachment of the hauling element, a rope, to the ends of the spring element;
FIG. 3 a cross section of a detail of said attachment;
FIG. 4 a cross section of a second embodiment of said attachment, and
FIG. 5 an end view of this attachment.
PREFERRED EMBODIMENTS
FIG. 1 shows how a main element of the spring means, from now on referred to as spring element 1, is made as a tightly wound screw spring with two diameters. The intermediate section 2 of the spring element has a considerably much larger diameter, here shown in double size, compared to the end-section 3 at both ends, which both connect to the intermediate section via conically wound sections 4.
The spring wire of the windings of the spring element is assumed to have an even thickness, and is here shown with a circular cross-section although other cross-sections are not excluded. The material is assumed to preferably be hardened steel, either stainless or equipped with some sort of rust protection. In certain applications, however, other alternate materials can be used.
The spring element 1 is arranged to work as a draw spring. In case of tension load, it will stretch, since the wire turns will be bent out from each other, and the stretch which is achieved at a certain load depends on the so-called spring constant. The value of the spring constant in turn depends on material qual
REFERENCES:
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patent: 1385919 (1921-07-01), Irwin
patent: 1509012 (1924-09-01), Whiting
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patent: 2924448 (1960-02-01), Nantz
patent: 3126860 (1964-03-01), Shepperton
patent: 4864956 (1989-09-01), Onstwedder, Jr.
patent: 5307753 (1994-05-01), Besonen, Sr. et al.
Basinger Sherman
Ewes Stalfjader AB
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