# US 4,393,571 A · Apparatus for producing an arc welded sleeve

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- Number: US 4,393,571 A
- Document ID: US4393571A
- Status: Granted
- Kind: A
- Application number: 06/192,526
- Filed: 1980-01-29
- Granted: 1983-07-19
- Earliest claimed: 1978-05-29
- Inventors: Werner Sturm
- Web page: https://patentgrep.com/patent/US4393571A

## CPC

- B29D 23/005: {provided with electrical wiring}
- B29C 65/342: {comprising at least a single wire, e.g. in the form of a winding}
- B29C 65/3468: {characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings (B29C65/3668 takes precedence)}
- B29C 65/3476: {being metallic}
- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- B29C 66/5221: {for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other}
- B29C 66/5229: {involving the use of a socket}
- F16L 47/03: Welded joints with an electrical resistance incorporated in the joint
- Y10T 29/49083: Heater type
- Y10T 29/49096: with winding
- Y10T 29/5142: and means to sever work from supply
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A first and a second clamp member 25, 35 are shaped onto a coil former 1 to be provided with a coil and together with first and second clamping bodies 26, 36 permit the clamping and holding of the wire 10 during the winding and/or separation of the wire. For separating the wire 10 a separating apparatus 45 having a separating mandrel 46 and a separating sleeve 47 is placed on the coil former 1, so that the separating sleeve is moved relative to the separating mandrel and as a result the wire is separated. The winding apparatus can form a station C of an injection moulding machine on which it is possible to produce arc welded sleeves 4 made from thermoplastic material.

## Claims

### Claim 1

An apparatus for forming a welding sleeve of the type having a coil of electrical resistance heating wire in spaced, juxtaposed turns embedded in the inner wall of a thermoplastic sleeve member and surrounding a cylindrical coil former, comprising
means at opposite ends of the coil former defining first and second clamp members;
means for winding the coil of wire around the former so that the windings extend from said first clamp member to said second clamp member;
first and second clamping bodies;
means for supporting said clamping bodies for movement toward and away from said first and second clamp members, respectively, so that said first clamping body can be moved to engage said first clamp member after the wire has been placed on said first member to attach the wire thereto, and said second clamping body can be moved to engage said second clamp member after the wire has been placed on said second member to attach said wire thereto; and
means operatively associated with said second clamping body for severing said wire after attachment thereof to said second clamp member.

### Claim 2 (depends on 1)

An apparatus according to claim 1 wherein each of said clamping bodies includes
a clamping mandrel,
a clamping sleeve partially surrounding said mandrel and slidable relative thereto, and
a spring urging said sleeve toward the distal end of said mandrel.

### Claim 3 (depends on 1, 2)

An apparatus according to claim 1 or 2 wherein said means for severing includes
a severing mandrel having a recess in the distal end thereof;
a severing sleeve slidably surrounding said mandrel and having a recess in the distal end thereof;
guide means interconnecting said sleeve and mandrel for guiding relative longitudinal and rotary movement thereof between a first position in which said recesses are aligned to form a wire-receiving slot and in which one of said sleeve and mandrel is retracted relative to the other, and a second position in which said recesses are out of alignment; and
spring means for urging said sleeve and mandrel toward said first position.

### Claim 4 (depends on 3)

An apparatus according to claim 3 wherein said coil former includes
means defining a recess near said second clamping member;
and wherein said means for severing further includes
means for moving said means for severing into and against said recess to engage said wire and to move said sleeve and mandrel to said second position, thereby severing said wire.

### Claim 5 (depends on 4)

An apparatus according to claim 4, wherein said means for moving said means for severing is movable with said means for supporting said second clamp body.

### Claim 6 (depends on 1)

An apparatus according to claim 1 which further includes
a first molding station for producing a coil former;
means for transporting the mold former from said first molding station to a winding station which includes said means for winding and said clamping bodies; and
a second molding station for receiving the coil former with a coil wound thereon from said winding station and for molding a sleeve portion thereon.

### Claim 7 (depends on 1)

An apparatus according to claim 1 wherein each of said first and second clamp members includes
a pin and a socket coaxially spaced from and surrounding said pin,
said socket having means defining a diametrically extending slot to receive said wire.