US4239473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mandrel with retractable segments
Assignee: PAPENMEIER FRANCE SARL
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Filing: 1979-06-27
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Granted: 1980-12-16
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Expires: 1999-06-27
Abstract
Abstract A mandrel for producing connecting sockets at the end of thermoplastic pipes, the mandrel containing a first and a second row of retractable segments and apparatus for actuating these segments. The apparatus comprises a first and a second actuating bush arranged so as to move axially on a central shaft. The segments of the first and second rows of segments are pivotably mounted on bushes by means of parallel, axially displaced joints. Support surfaces, which are orthogonal to the mandrel axis, serve to hold the segments during their radial movement.
Inventors
- 👤 H. Lucien Fulhaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:14
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02; B29C57/04; Y; Y10; Y10S; Y10S425/00; Y10S425/218
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
218 words
A mandrel with at least two shaping cylindrical surfaces, successively arranged in axial extension of one another between the free mandrel end and a mounting flange, comprising a first and a second row of moveable segments which can assume a first extended position in which the radially outer surface of the segments associated alternately with the different rows in the peripheral direction form a continuous torus which separates the two cylindrical shaping surfaces from one another, and which can assume a second retracted position in which the distance from the radially outer surface thereof to the axis is smaller than the radius of the cylindrical shaping surfaces and the segments of one row can be axially displaced with respect to those of the other row, further comprising actuating means for bringing about the extension and retraction movements, wherein said actuating means comprises a first and a second bush which are arranged in axially moveable manner within the first and the second shaping surfaces respectively and on which the segments of the first and second rows of segments are pivotably mounted by means of two parallel, axially displaced joints, and wherein orthogonal support surfaces are provided for the axial retaining of the segments during their radial movement together with means for displacing the first and the second bush respectively.
Claim 2
Dependent Claim
218 words
A mandrel with at least two shaping cylindrical surfaces, successively arranged in axial extension of one another between the free mandrel end and a mounting flange, comprising a first and a second row of moveable segments which can assume a first extended position in which the radially outer surface of the segments associated alternately with the different rows in the peripheral direction form a continuous torus which separates the two cylindrical shaping surfaces from one another, and which can assume a second retracted position in which the distance from the radially outer surface thereof to the axis is smaller than the radius of the cylindrical shaping surfaces and the segments of one row can be axially displaced with respect to those of the other row, further comprising actuating means for bringing about the extension and retraction movements, wherein said actuating means comprises a first and a second bush which are arranged in axially moveable manner within the first and the second shaping surfaces respectively and on which the segments of the first and second rows of segments are pivotably mounted by means of two parallel, axially displaced joints, and wherein orthogonal support surfaces are provided for the axial retaining of the segments during their radial movement together with means for displacing the first and the second bush respectively.
Claim 3
Dependent Claim
114 words
A mandrel according to claim 1, wherein the first shaping surface is carried by a cylinder fixed between the free mandrel end and the segments, the second shaping surface is carried by a slide which is constructed so as to slide on the second actuating bush, a spring under pressure between the slide and the second actuating bush forces (a) the slide in the direction of the first shaping surface and (b) the second actuating bush in the opposite direction, a limiting means is provided for limiting the movement of the slide in the direction of the first shaping surface and said support surfaces are formed on the facing surfaces of cylinder and slide.
Claim 4
Dependent Claim
56 words
A mandrel according to claim 2, wherein the limiting means comprise a rod arranged parallel to the mandrel axis and whose one end is connected in fixed manner to slide and whose other end has a thread, passes freely through a bore on the mounting flange and carries a nut and lock nut for adjustment purposes.
Claim 5
Dependent Claim
29 words
A mandrel according to claim 1 wherein the first and second actuating bush are mounted on the same shaft which is connected in fixed manner to the mounting flange.
Claim 6
Dependent Claim
106 words
A mandrel according to claim 4, wherein the actuating means of the first actuating bush is a central actuating rod which can be axially displaced in a bore of central shaft and flange, having an end opposite to the end which projects from the flange which is connected to one of the ends of a transmission rod, whose second end is connected to the first actuating bush, the actuating means of the second actuating bush comprising at least one offset rod which is axially displaceable in flange which has an end opposite to the end projecting from flange which is connected to the second actuating bush.
Claim 7
Dependent Claim
70 words
A mandrel according to claim 2, wherein each of the retractable segments of the first row is axially held in the retracted position by means of a further joint which is pivotably mounted on both a segment and the cylinder carrying the first shaping surface, whereby said further joint can be pivoted in a direction which is parallel to the mandrel axis in the plane of the two parallel joints.
Claim 8
Dependent Claim
56 words
A mandrel according to claim 2, wherein at least one guide rod which is parallel to the mandrel axis and has an end which is connected to the cylinder carrying the first shaping surface and a second end which is connected to the mounting flange, said rod being freely received by the corresponding bore of slide.
Claim 9
Dependent Claim
53 words
A mandrel according to claim 2, wherein the cylinder carrying the first shaping surface also has an internal annular passage for receiving a heating means supplied by lines which are parallel to the mandrel axis and pass between the segments, and by ducts which pass through corresponding bores of cylinder slide and flange.
Claim 10
Dependent Claim
29 words
A mandrel according to claim 2, wherein the second shaping surface is connected in fixed manner with the mounting flange and the slide can be displaced within said surface.
Claim 11
Dependent Claim
38 words
A mandrel according to claim 2, wherein the second shaping surface moves freely on the slide to cover the segments in the retracted position in order in this way to form a direct extension of the first surface.
Claim 12
Dependent Claim
36 words
A mandrel according to claim 1, wherein a third cylindrical shaping surface is provided on its free end, the diameter of said third shaping surface being smaller than that of the first and second shaping surfaces.
Claim 13
Dependent Claim
40 words
A shaping machine, comprising a mandrel according to claim 5 and having means for actuating the end of the central actuating rod and at least one offset rod which projects from the side of the flange opposite to the mandrel.
Claim 14
Dependent Claim
19 words
A shaping machine according to claim 12, wherein the rod actuating means are hydraulic cylinders or compressed air cylinders.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |