# US 4,375,011 A · Cable connector

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- Number: US 4,375,011 A
- Document ID: US4375011A
- Status: Granted
- Kind: A
- Application number: 06/241,371
- Filed: 1981-03-06
- Granted: 1983-02-22
- Earliest claimed: 1980-05-07
- Inventors: Dietrich Grunau
- Web page: https://patentgrep.com/patent/US4375011A

## CPC

- H02G 3/0641: {with means distorted around the conductors}
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES

## Abstract

A cable connector comprises a screw socket, a screw nut, a packing within the screw nut and an anti-rotation bushing between the packing and the screw nut. The screw nut, packing and bushing are provided with conical portions respectively which have the same angle of taper and substantially the same axial length. Between a cylindrical portion of the packing and the threaded portion of the screw nut an annular recess is formed into which a cylindrical rim of the bushing protrudes. The screw nut can easily be screwed on the socket only by hand because of the low friction effect between the bushing and the screw nut, thereby deforming the packing whereby a fluid-tight seal between the socket and the cable is gained and the cable is secured against twisting during the screw-operation and secured against axial movement at the end of said screw-operation.

## Claims

### Claim 1

A fluid-tight cable connector for connecting electric cables with switch cabinets, plug-in connections and the like comprising a screw socket provided with an outer thread, a screw nut provided with an inner thread, a tubular rubber packing arranged within the screw nut and a thin-walled anti-rotation bushing arranged between the screw nut and the packing; the screw nut comprising an inner cylindrical portion provided with said inner thread and an inner conical portion, the mouth of which having an overdimension with respect to the cable diameter; the tubular packing comprising a cylindrical portion and a conical portion, the cylindrical portion having a radial front face abutting at a front face of the socket, said packing being provided with at least one deformable inner ring-shaped sealing lip and one outer ring-shaped sealing lip, an annular recess being formed between the cylindrical portion of the packing and the inner thread of the screw unit, the anti-rotation bushing also comprising a cylindrical portion and a conical portion, the cylindrical portion being of shorter axial length than the cylindrical portion of the packing and protruding into said annular recess; the outer conical surface of the packing, the conical portion of the bushing and the inner conical portion of the screw nut having the same angle of taper and substantially the same axial length.

### Claim 2 (depends on 1)

A connector as claimed in claim 1, wherein the wall-thickness of the conical portion of the packing reduces to the smaller end thereof.

### Claim 3 (depends on 1)

A connector as claimed in claim 1, wherein the outer ring-shaped sealing lip is of outwardly tapering wedge-shaped cross-section with a sufficient radial dimension for engaging into the thread of the screw nut.

### Claim 4 (depends on 1)

A connector as claimed in claim 1, wherein two inner ring-shaped sealing lips are provided each of which is of inwardly tapering wedge-shaped cross-section and extends with an axial component in counter-direction to that of the conical portion of the packing.

### Claim 5 (depends on 4)

A connector as claimed in claim 4, wherein the first one of said sealing lips as seen from the front face of the cylindrical portion of the packing inwardly extends a slightly greater distance as compared with the second one.

### Claim 6 (depends on 4, 5)

A connector as claimed in claim 4 or 5, wherein one flank of the inner sealing lips respectively lies in a substantially radial plane.

### Claim 7 (depends on 1, 3)

A connector as claimed in claim 1 or 3, wherein the front face of the outer sealing lip facing in the same direction as the front face of the cylindrical portion of the packing lies in a radial plane.

### Claim 8 (depends on 1)

A connector as claimed in claim 1, wherein the anti-rotation bushing is made of a material selected from a group which consists of polyamide and polytetrafluor ethylene.