# US 2018/0026386 A1 · Coupling for Power Cables

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- Number: US 2018/0026386 A1
- Document ID: US20180026386A1
- Status: Published application
- Kind: A1
- Application number: 15/673,131
- Filed: 2017-08-09
- Published: 2018-01-25
- Earliest claimed: 2015-02-13
- Assignees: Tbi Industries GmbH
- Applicants: TBI Industries GmbH
- Inventors: Oliver BINZEL
- Web page: https://patentgrep.com/patent/US20180026386A1

## CPC

- H01R 13/213: by bayonet connection
- H01R 4/302: {having means for preventing loosening of screw or nut, e.g. vibration-proof connection}
- H01R 13/625: Casing or ring with bayonet engagement
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS

## Abstract

The invention relates to a coupling for power cables, consisting of a plug part (1) and a socket part, said plug part (1) having a basic body (2) comprising a coupling pin (3) on which a locking pin (4) is arranged, said locking pin (4) being mounted in the plug part (1) so as to be displaceable in the axial direction of the coupling pin (3), said locking pin (4) being held in a basic position towards a back end (11) of the coupling pin (3) by a spring force and, while the coupling is being locked, being moved by interlocking with a helical groove of the socket part towards the front end (12) of the coupling pin (3) and a spring device (16) being loaded in the process.

## Claims

### Claim 1

A coupling for power cables having a plug part (1) and a socket part (7), said plug part (1) and said socket part (7) comprising a device for connecting a power cable (6) in a fixed manner, said plug part (1) comprising a basic body (2) which has a coupling pin (3) projecting over a front side (27) of the basic body (2) and is arranged in the axial direction of the coupling and has a locking pin (4) laterally arranged on the coupling pin (3), said socket part (7) comprising a basic body (8) which is provided with an axial bore (9) for accommodating the coupling pin (3), said axial bore (9) comprising, in a bore wall (29), a groove (10) which starts from a front side (28) of the basic body (8) and comprises a helical segment (24) and extends to the front end of the basic body (8), said groove (10) serving to accommodate a locking pin (4) of the plug part (1) such that when an engagement connection is produced between the plug part (1) and the socket part (7), the coupling pin (3) is inserted into the bore (9) of the socket part (7) in such a manner that the locking pin (4) is accommodated in the groove (10) of the socket part (7) and the plug part (1) and the socket part (7) are clamped against each other like a bayonet connector by means of the locking pin (4) guided in the groove (10) via a subsequent relative rotation of the plug part (1) and the socket part (7), characterized in that the locking pin (4) is displaceably mounted in the plug part (1) in the axial direction of the coupling pin (3), said locking pin (4) being held in a basic position towards a back end (11) of the coupling pin (3) by means of a spring device (16) and said locking pin (4) being displaced towards the free end (12) of the coupling pin (3) by interlocking with the groove (10) in the socket part (7) when the engagement connection is produced between the plug part (1) and the socket part (7) and the spring device (16) thus being loaded so as to form a pre-load force.

### Claim 2 (depends on 1)

The coupling for power cables according to claim 1, characterized in that the coupling pin (3) of the plug part (1) is provided with a central through bore (13) as well as a radial recess (14), a tension rod (15) being guided in the central through bore (13), said tension rod (15) being provided with the locking pin (4) radially arranged on the front end, said locking pin (4) passing through the radial recess (14) and the spring device (16) being arranged between the basic body (2) and the tension rod (15) in such a manner that when the engagement connection is produced between the plug part (1) and the socket part (7), the locking pin (4) is displaced into the socket part (7) and the pre-load force increases.

### Claim 3 (depends on 1)

The coupling for power cables according to claim 1, characterized in that the spring device (16) comprises at least one plate spring (17).

### Claim 4 (depends on 1)

The coupling for power cables according to claim 1, characterized in that a stop for limiting the movement of the locking pin is formed at the front end of the coupling pin.

### Claim 5 (depends on 4)

The coupling for power cables according to claim 4, characterized in that the stop for the movement of the locking pin (4) is defined by the end of the spring path of the at least one plate spring (17).

### Claim 6 (depends on 1)

The coupling for power cables according to claim 1, characterized in that the coupling pin is mounted axially displaceable in the basic body of the socket part, said coupling pin being provided with a radially arranged locking pin and the spring device being arranged between the basic body and the coupling pin in such a manner that when the engagement connection is produced between the plug part and the socket part, the coupling pin is pulled out of the basic body and the pre-load force increases.

### Claim 7 (depends on 1)

The coupling for power cables according to claim 1, characterized in that the groove (10) formed in the socket part (7) comprises a groove segment (25) arranged parallel to the front side (28) at the end of the groove (10) facing away from the front side (28) in such a manner that when the engagement connection is produced between the plug part (1) and the socket part (7), a continuous increase of the pre-load of the spring device (16) remains constant at first while the locking pin (4) is being displaced in the area of the helical segment (24) of the groove (10) and subsequently the pre-load force remains constant while the locking pin (4) is being displaced in the area of the groove segment (25).

### Claim 8 (depends on 1)

The coupling for power cables according to claim 1, characterized in that the groove (10) formed in the socket part (7) comprises a groove segment (26) facing back to the front side (28) at the end of the groove (10) facing away from the front side (28) in such a manner that when the engagement connection is produced between the plug part (1) and the socket part (7), a continuous increase of the pre-load force of the spring device (16) is continuously reduced at first while the locking pin (4) is being displaced in the area of the helical segment (24) of the groove (19) and subsequently the pre-load force is continuously reduced while the locking pin (4) is being displaced in the area of the groove segment (26).

### Claim 9 (depends on 1)

The coupling for power cables according to claim 1, characterized in that either the plug part (1) or the socket par (7) is intended to be installed in an electrical device.