Patent US3690141A successfully refreshed from Google Patents.
US3690141A
Expired / Lapsed
US
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Taper-expanding mandrel
Assignee: John Dale Ltd
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Filing: 1969-12-08
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Granted: 1972-09-12
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Expires: 1989-12-08
Abstract
Abstract The present disclosure relates to taper-expanding mandrels and in particular taper-expanding mandrels suitable for flaring or tapering collapsible tubes to permit stacking of one tube within another. The mandrel includes a plurality of discrete longitudinal segments defining a generally cylindrical mandrel surface with hinge means at one end. Expansion means urges the segments outwardly about the hinge means to define a taper to shape a tubular workpiece placed over the mandrel.
Inventors
- 👤 Thomas Duncan Brownbill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:42
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/36; B65; B65B; B65B9/00; B65B9/10; B65B9/13; B65B9/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A taper expanding mandrel for expanding tubes of relatively low strength material comprising a plurality of discreet longitudinal segments having first and second ends which together constitute a segment assembly and define a generally cylindrical mandrel surface, hinge means provided at the first end of said segments to permit each of said segments to hinge radially outwardly of the longitudinal axis of said cylindrical surface, a sheath of low friction resilient material having a smooth circumference without discontinuities, provided about the segments to protect an article disposed about the mandrel, expansion means adapted to urge said segments outwardly and about said hinge means at said first end of the segments so that the outer surfaces of the segment define a taper and corresponding means for producing relative motion between said segments and said expansion means between an inoperative position in which the segments define a substantially cylindrical mandrel surface and an operative position in which the segments define a tapered surface.
Claim 2
Dependent Claim
161 words
A taper expanding mandrel for expanding tubes of relatively low strength material comprising a plurality of discreet longitudinal segments having first and second ends which together constitute a segment assembly and define a generally cylindrical mandrel surface, hinge means provided at the first end of said segments to permit each of said segments to hinge radially outwardly of the longitudinal axis of said cylindrical surface, a sheath of low friction resilient material having a smooth circumference without discontinuities, provided about the segments to protect an article disposed about the mandrel, expansion means adapted to urge said segments outwardly and about said hinge means at said first end of the segments so that the outer surfaces of the segment define a taper and corresponding means for producing relative motion between said segments and said expansion means between an inoperative position in which the segments define a substantially cylindrical mandrel surface and an operative position in which the segments define a tapered surface.
Claim 3
Dependent Claim
120 words
A mandrel as claimed in claim 1 wherein the expansion means comprises a frusto-conical element arranged to abut said second end of said segment assembly and a rod means adapted to slide within said frusto-conical element and engage said first end of said segment assembly and operating means for applying axial movement to said rod means to provide relative axial movement with respect to the frusto-conical element so that operation of the operating means will produce relative motion between said segment assembly and said element urging said second end of said segment assembly outwardly, whereby the segments are caused to hinge about the said hinge means to define a taper mandrel surface having a free end at said hinge means.
Claim 4
Dependent Claim
27 words
A mandrel as claimed in claim 1 wherein the operating means for producing relative movement between the expansion means and the segment assembly is an hydraulic ram.
Claim 5
Dependent Claim
35 words
A mandrel as claimed in claim 1 wherein the hinge means permits a limited predetermined expansion of said segment assembly at said first end before expansion of the main body of the segment assembly commences.
Claim 6
Dependent Claim
34 words
A mandrel as claimed in claim 1 wherein the hinge means provided at said first end of the segment assembly secures each of said segments at that end one with respect to the other.
Claim 7
Dependent Claim
72 words
A method of forming unfilled collapsible tubes for packing comprising the steps of providing collapsible tubes having cylindrical body portions, expanding the tube using a mandrel as claimed in claim 2 to flare the tube from a smaller diameter end to a larger diameter end and stacking a plurality of similarly formed tubes by locating the smaller diameter end of the first tube within the larger diameter end of the second tube.
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |