US3754717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible mandrel
Assignee: Dana Inc
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Filing: 1971-07-12
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Granted: 1973-08-28
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Expires: 1991-07-12
Abstract
Abstract A collapsible mandrel is provided for use, for example, in the production of filament wound containers and has retractable side walls which are operative in such a manner as to permit the walls to be peeled-away from contact with the interior of a finished container so that the mandrel can be quickly and easily removed from the interior of the container and readily reusable for the production of another container. Retraction of the side walls is accomplished by the provision of a primary and secondary lever or linkage assembly. The secondary linkage assembly is operatively connected to the side walls of the mandrel while the primary linkage is connected to and controls the movement of the secondary linkage by means of a fluid power actuated cylinder.
Inventors
- 👤 G Saidla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:09
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/485; B29L; B29L2023/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A hollow collapsible mandrel comprising a pair of opposed concave longitudinally extending major sections, each of said major sections having transversely spaced and longitudinally extending free edges, with the free edges of one major section being movable independently of the free edges of the other major section and with the free edges of one major section being disposed cooperatively wih the free edges of the other major section at such times as the mandrel is expanded, each of said major sections comprising a pair of longitudinally extending minor sections, longitudinally extending hinge means pivotally connecting said minor sections, and linkage means connected to said minor sections for pivoting the minor sections of each major section inwardly toward each other and for moving said hinge means toward each other and collapsing said mandrel and for pivoting said minor sections away from each other and for moving said hinge means away from each other for expanding said mandrel to its expanded condition, said linkage means pivoting the minor sections of one of said major sections toward each other a greater amount when collapsing said mandrel then said linkage means pivots the minor sections of the other of said major
Claim 2
Dependent Claim
197 words
A hollow collapsible mandrel comprising a pair of opposed concave longitudinally extending major sections, each of said major sections having transversely spaced and longitudinally extending free edges, with the free edges of one major section being movable independently of the free edges of the other major section and with the free edges of one major section being disposed cooperatively wih the free edges of the other major section at such times as the mandrel is expanded, each of said major sections comprising a pair of longitudinally extending minor sections, longitudinally extending hinge means pivotally connecting said minor sections, and linkage means connected to said minor sections for pivoting the minor sections of each major section inwardly toward each other and for moving said hinge means toward each other and collapsing said mandrel and for pivoting said minor sections away from each other and for moving said hinge means away from each other for expanding said mandrel to its expanded condition, said linkage means pivoting the minor sections of one of said major sections toward each other a greater amount when collapsing said mandrel then said linkage means pivots the minor sections of the other of said major
Claim 3
Dependent Claim
13 words
A mandrel according to claim 1 wherein said major sections are half sections.
Claim 4
Dependent Claim
13 words
A mandrel according to claim 2 wherein said minor sections are quarter sections.
Claim 5
Dependent Claim
26 words
A mandrel according to claim 3 wherein said mandrel is rectangular when viewed in transverse cross-section, and said quarter sections each have a right angled configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |