Metal working – Method of mechanical manufacture – Disassembling
Patent
1987-07-02
1988-11-01
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Disassembling
100214, B23P 1900
Patent
active
047809450
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
In conjunction with sails and other canvas materials use is made of fasteners in the form of rings which afford protection to holes made in the canvas. In line with the increasing strength of the canvas material imparted by new fibres and manufacturing processes, it has been necessary to adapt the rings to suit the higher stresses which are imposed on the canvas. In order to achieve increased strength in the ring and to improve its holding properties, rings have been produced from very strong material and with a toothed engagement in the canvas. A ring of this kind is disclosed in British Pat. No. 2 123 337, Rutgersson.
Technical Problem
The rings are permanently installed as a general rule, although in certain cases it is necessary to make changes or to carry out repairs of a kind which require one or more of the rings to be removed. The removal of the rings is made more difficult by the increased strength of the rings and their improved holding properties. Removal is made particularly difficult and is associated with a considerable risk of damage to the canvas in the case of those rings which, like the ring in accordance with the indicated patent, are equipped with tags which penetrate through the canvas and are also curved at their tips. The removal of such rings generally requires the outer parts of the rings to be parted, for example by grinding, and for the teeth to be bent out, in the event of these being bent around the canvas, one by one so that they can be withdrawn together with that part of the ring to which they are attached.
The object of the present invention is to make available a method for the removal of rings, in particular those which are used in sails and other canvas materials which are of the heavy-duty type, executed in accordance with what is stated in this patent, for example. The invention also relates to an implement arrangement which can be used for the execution of the method.
The Solution
Removal is effected by the ring being pressed between two implement parts, one of which implement parts is forced against one side of the ring along a line which is concentric with the tubular part on its edge, and the other part of the implement on the other side of the ring is forced along a line which follows the ring on its outer edge. A radial distance is thus provided between the engaging edges of both implements, in this way subjecting the ring to a tilting movement, viewed over its cross-section, which, when the parts of the implement are pressed together, produces the conical form with a progressively reducing angle until that side part against which the first part of the implement is in engagement assumes an at least near enough cylindrical appearance, in which case said ring-shaped part of the ring can be released through being enabled to pass over the last-mentioned, compressed side part whilst the ring-shaped part is likewise caused to adopt a concial form. The arrangement comprises the two parts of the implement for the aforementioned engagement circumstances.
Advantages
What is achieved through the invention is that rings, including those of the heavy-duty kind and those which are equipped with teeth, can be removed without the canvas being damaged and in such a way that the teeth can be withdrawn from the canvas without ripping it.
Removal can be executed in accordance with the method and with the help of the implement arrangement as a single operation in a force-applying arrangement such as a press. Such force-applying arrangements are used by all those who are involved with the fitting of rings of the aforementioned heavy-duty type. Removal can thus largely be executed using existing equipment.
BRIEF DESCRIPTION OF THE DRAWINGS
The method in accordance with the invention is illustrated stage by stage in the accompanying drawyings, from which the implement arrangement can also be appreciated.
FIGS. 1-3 illustrate different stages in the removal operation, from the securely installed ring in a state in which it has not yet been processed ready for
REFERENCES:
patent: 2807081 (1957-09-01), Black
patent: 3890695 (1975-06-01), Gaastra
patent: 4615208 (1986-10-01), Hailey
Chin Frances
Eley Timothy V.
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