Electricity: conductors and insulators – With fluids or vacuum – With cooling or fluid feeding – circulating or distributing
Patent
1992-12-07
1995-05-09
Picard, Leo P.
Electricity: conductors and insulators
With fluids or vacuum
With cooling or fluid feeding, circulating or distributing
174140R, H01B 1716
Patent
active
054142180
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an arrangement for cable tensile strain relief comprising a cable, a cable sheath, means for attaching it to a body absorbing the tensile strain and a clamping part for constricting the cable and fixing it relative to the sheath.
Different designs for cable tensile strain relievers or cable passages with strain relief are known. For example, DE-OS 23 40 314 describes a cable passage with strain relief, in which a holding element consisting, for example, of an elastic plastic material is seated in an opening in a housing wall, this element being coated onto the cable. In the case of multiwired cables, the outer cable casing is removed in the region of the coating and the casings around the individual wires are roughened so that an adequate tensile strain relief is ensured for the individual wires.
DE-OS 27 48 419 describes a seal for a submersible motor or the like. The seal closes an opening in the housing for the motor, through which a sheathed electrical cord is guided. Associated with the seal are a short piece of pipe coaxially surrounding the opening and attached to the inside of the housing and a cylindrical sealing element made of an elastomeric material and having an axial passage for the sheathed cord. The external diameter of the sealing element is greater than the internal diameter of the pipe, and the diameter of the axial passage is greater than the external diameter of the sheath. If the sealing element is pressed into the pipe, the diameter of the passage is reduced, and the sealing element presses against the sheath. Moreover, a clamping ring is attached to the sheathed cord in the interior of the housing such that it comes into contact with the sealing element when the cord is drawn outwards in relation to the housing.
DE-OS 34 09 906 describes a cable bushing for holding in position and reinforcing a cable guided through an opening of an appliance. The cable bushing consists of an elongated hollow body made from a resilient material and has, in the region of the opening, a bulge with a groove arranged therein. The internal diameter of the hollow body is, at least at a point of clamping, smaller than the external diameter of the cable. The opening has a funnel-shaped extension within the appliance. The bulge of the hollow body rests on the extension within the groove. If the cable is drawn outwards in relation to the housing, the bulge is pressed against the funnel-shaped extension and, therefore, the diameter of the hollow body is reduced in the region of the extension. Consequently, the more the cable is drawn, the more the hollow body is pressed against the cable.
Finally, in a catalogue ("Technik rund ums Kabel, Katalog A 32, Marz 1988"=Technology All Around The Cable, Catalogue A 32, March 1988) of the company U. I. Lapp KG in Stuttgart, a nylon binder is recommended for a good tensile strain relief, i.e. a nylon band which is wound around a cable bushing surrounding the cable such that the bushing is constricted and pressed against the cable.
DE-38 26 474 A1 describes an arrangement for cable tensile strain relief, in which the cable is surrounded by a casing bearing on its inner side projections which can be pressed into the cable sheathing. Such an arrangement results in the cable being fixed in position and relieved of tensile strain only when it is inserted into a housing since the sheathing is pressed against the cable only due to the insertion into the housing. It is difficult to insert this arrangement for cable tensile strain relief into the housing since the sheathing must be pressed forcibly against the cable to make an insertion even possible. This can cause a longitudinal displacement of the cable relative to the sheathing which may be undesired.
The object of the invention is to specify an arrangement for cable tensile strain relief which not only provides adequate strain relief at high tensile loads but also ensures reliable protection against buckling and which is of simple construction and very stable.
This object is accomplished in accordance
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"Technik rund ums Kabel," U. I. Lapp KG, Catalog A32, Mar. 1988.
Alfred Karcher GmbH & Co.
Horgan Christopher
Lipsitz Barry R.
Picard Leo P.
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