Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1985-06-11
1987-08-18
Silbaugh, Jan H.
Metal working
Method of mechanical manufacture
Assembling or joining
29235, 264510, 264573, B23P 1102, B29C 4900
Patent
active
046867554
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of enclosing a body in a relatively thick enclosure of elastic material, especially rubber.
In many applications, there is a demand for rigid bodies made of, for example, wood, metal or concrete and having a relatively thick outer coating of rubber or other elastic material. Examples of such bodies are fenders of various types and rollers for roller conveyors. Providing these bodies with such a coating is difficult because considerable forces are required for expanding, for example, a rubber sleeve to such an extent that the body can be inserted therein, and for removing the expanders after the expansion. It is, of course, also conceivable to apply the coating by immersion of the body, or by vulcanization technique, but these methods are difficult and, above all, highly expensive.
A principal object of this invention is to eliminate the above-mentioned difficulties and to provide bodies with such a relatively thick external coating in a simple manner and at low cost. A further object of the invention is to enclose, in similar manner, liquid and gaseous bodies in a casing such that the casing exerts a considerable pressure on the body so that the body, if desired, can escape under pressure. These objects are attained according to a method of the invention wherein the enclosing material, in the form of a sleeve or the like which is open at one end and has a cavity of a cross-sectional area far smaller than that of the body, is inserted in a tight casing of rigid material. The open end of the sleeve is widened and tightly connected to the casing wall defining the entrance opening, and the widened sleeve end is tightly sealed by means of a sealing member that can be clamped thereagainst. Pressurized fluid is supplied to the cavity of the sleeve by means of a valve provided in said sealing member, while at the same time the air is vented from the space between the casing and the sleeve via a valve mounted in the casing wall. The supply of pressure fluid is continued until the outer side of the sleeve substantially engages the inner side of the casing, the valve in the casing wall then being closed so that the sleeve is maintained in its expanded state when the valve in the sealing member is opened and the sealing member is removed. The body is inserted in the expanded sleeve and the valve in the casing is opened, whereby the sleeve seeks to resume its original dimension and thus tightly and with considerable force engages and tends to compress the body. Finally, the widened end of the sleeve is loosened from the casing and, if necessary, is sealed, and the enclosed body is removed from the casing.
The invention also provides an apparatus for enclosing a body in a relatively thick enclosure of elastic material, especially rubber, said apparatus being characterized by a casing of rigid material, such as steel, which has been dimensioned on the basis of the dimensions of said body and said enclosure and which is open at one end but otherwise is closed, and into which the enclosing material can be inserted in the form of a sleeve or the like open at one end; a clamping device mounted at the open end of said casing and movable into engagement with the open end of said sleeve to clamp said end into tight engagement with the wall portion defining the opening of said casing; a sealing member which can be tightly clamped in the sleeve opening clamped against the said wall; a valve provided in said sealing member and connectible to a pressure fluid source for supply of pressure fluid to the cavity of said sleeve for widening said sleeve into engagement with the inner side of said casing; and a valve provided in the casing wall for withdrawing air from the space between said casing and said sleeve upon said widening, said valve being closable when said sleeve has been widened into engagement with the inner side of said casing to maintain said sleeve in the widened state, and again openable when the body, after removal of said sealing member, has been inserted in said sleeve, such
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patent: 3611536 (1971-10-01), Guenther et al.
patent: 4291454 (1981-09-01), Sawaryn
McCarthy Neil Michael
Silbaugh Jan H.
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