Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1986-02-28
1987-08-11
Askin, Laramie E.
Metal working
Method of mechanical manufacture
Assembling or joining
29458, 745519, 156294, 174 74A, B29C 6322, H02G 1502, H01B 1758
Patent
active
046851895
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a sleeve which is made of a pliable, elastic material and which is intended to be turned inside out when fitted onto a slender elongated core.
BACKGROUND
Sleeves made of pliable, elastic material and intended to be fitted on a slender, elongated core, such as end-pieces for high tension cables, are known in the art, for example, Swedish 405 904. It is often difficult to insert this known kind of sleeve into position, even when using a lubricant, since the lubricant is prone to be carried away by the leading edge of the sleeve as it is fitted, and fails to remain between the sleeve and the core.
A method of holding the sleeve distended during the mounting of said sleeve, so that the lubricant remains within the sleeve, is described in Swedish 424 386.
A sleeve which is intended to fully enclose the end of a cable and which is intended to be turned inside out when being fitted thereon is described in U.S. Pat. No. 3,992,570. It is stated in this patent that the sleeve shall be inflated, so as to reduce friction between surfaces which slide against one another.
The fact that when a sleeve is fitted onto a slender, elongated core, the lubricant applied is picked up and displaced by the leading edge of the sleeve with no reduction in friction is a problem which often occurs.
SUMMARY OF THE INVENTION
The sleeve according to the invention is of the type intended to be turned inside out when fitted on a core and in order to reduce friction between the mutually contacting and sliding surfaces, the sleeve is provided with an outer-surface structure including densely located lubricant accommodating hollows. The hollows may have the form of closely adjacent grooves extending around the sleeve.
As a result of the presence of these grooves, the lubricant will remain on the mutually sliding surfaces, without being forced away as the sleeve is fitted on the core.
BRIEF DESCRIPTION OF THE DRAWING
An embodiment of a sleeve according to the invention will now be described with reference to the accompanying drawing, in which:
FIG. 1 is a detail, on enlarged scale, of a portion of the sleeve in FIG. 1; and
FIGS. 1-4 illustrate different stages in the fitting of the sleeve on a core.
DETAILED DESCRIPTION OF A BEST MODE FOR CARRYING OUT THE INVENTION
In the illustrated embodiment, a sleeve is intended to be fitted as an end-piece on a slender, elongated core at the end of a high tension cable. The end-piece is made of a pliable, elastic material, for example, silicone rubber, having a hardness of about 35 Shore A.
As shown in FIG. 1, the end-piece 1 is cylindrical and includes a plurality of parts of different diameters corresponding to the core. The end-piece has a part 2 of smallest diameter located at one end thereof, such that said end-part will fit over that end 3 of the cable which has been stripped of insulation, c.f. also FIGS. 2-4.
Commencing from a location adjacent the narrowest end-part 2, the end-piece includes, along the major part of its length, a part 4 of larger diameter which is able to fit over the cable-insulation 5, which is free from external cable-reinforcement.
A part 6 of the end of the end-piece remote from the narrowest end-part 2 thereof has the largest diameter, to enable it to fit over the outer reinforcement 7 of the cable.
The outer surface of the sleeve is provided with densely located hollows 8 along substantially the entire length of the sleeve.
The hollows 8 are in the form of densely located grooves extending around said end-piece; the grooves in this embodiment have a depth of 0.5 mm and an interspacing or pitch of 0.75 mm, c.f. the enlarged detail 8a of FIG. 1a.
In accordance with an alternative embodiment, the hollows 8 may have a different form, for example the form of a dense scattering of cup-shaped craters or the like. The dimensions of the hollows are adapted to the intended purpose of the hollows, as will become more apparent hereinafter.
The inner surface 9 of the end-piece is entirely smooth.
The end-piece 1 is in
REFERENCES:
patent: 1888349 (1932-11-01), Jacoby
patent: 2269076 (1942-01-01), Boll
patent: 3992570 (1976-11-01), Beinhaur
patent: 4506430 (1985-03-01), Guzay, Jr.
Palmqvist Lars I.
Svensson Bolennart A.
Askin Laramie E.
Kabeldon Aktiebolag
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