US3904144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible mandrel
Assignee: Individual
•
Filing: 1972-07-03
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Granted: 1975-09-09
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Expires: 1992-07-03
Abstract
Abstract Expansible mandrel comprising a shaft having an axial hollow chamber. Pressing elements are guided in slots of the shaft. At least one hose member within said shaft is capable of being expanded by a fluid. Valve means control admission and exhaust of the fluid. Mounted in a conduit in said shaft is at least one check valve relative to each hose member. Engaging means project from the check valve. At least one slidable rod member is arranged for sliding movement in the shaft. The engaging means projects for engagement by the slidable rod member. Spring means are arranged between the rod member and a stationary portion of the shaft, to return the rod member to an inactive position.
Inventors
- 👤 Giovanni Gattrugeri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:30
CPC Classifications
B; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/24; B65H75/242; B65H75/243; B65H75/2437; F; F16; F16B; F16B4/00; F16B4/002; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1021; Y10T279/1024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
An expansible mandrel comprising a shaft, a first axial hollow chamber in said shaft, said chamber selectively communicating with a source of fluid under pressure, at least two longitudinal slots on the periphery of said shaft and being circumferentially spaced apart, pressing elements received in said slots, said slots and said pressing elements having cooperating means to guide said pressing elements radially with respect to the shaft, an inflatable air hose member received in each of said slots, said air hose members being located beneath said pressing elements and being supported on said shaft and closed at the ends thereof to allow said air hose members to be inflatable for urging said pressing elements radially outward, each hose having passage means providing pneumatic communication between the interior of the hose member and said first chamber,, wherein the improvement comprises each hose having valve means controlling the admission of fluid from said first chamber through said first passage means into the interior of said hose member for inflation thereof and for controlling the exhaust from said air hose member interior into said chamber for deflation thereof the valve means of each hose member being independent of the pressure condition of any other hose member.
Claim 2
Dependent Claim
203 words
An expansible mandrel comprising a shaft, a first axial hollow chamber in said shaft, said chamber selectively communicating with a source of fluid under pressure, at least two longitudinal slots on the periphery of said shaft and being circumferentially spaced apart, pressing elements received in said slots, said slots and said pressing elements having cooperating means to guide said pressing elements radially with respect to the shaft, an inflatable air hose member received in each of said slots, said air hose members being located beneath said pressing elements and being supported on said shaft and closed at the ends thereof to allow said air hose members to be inflatable for urging said pressing elements radially outward, each hose having passage means providing pneumatic communication between the interior of the hose member and said first chamber,, wherein the improvement comprises each hose having valve means controlling the admission of fluid from said first chamber through said first passage means into the interior of said hose member for inflation thereof and for controlling the exhaust from said air hose member interior into said chamber for deflation thereof the valve means of each hose member being independent of the pressure condition of any other hose member.
Claim 3
Dependent Claim
49 words
An expansible mandrel according to claim 1, wherein said valve means are of the check valve type closing the passage of fluid therethrough when the pressure within the hose is greater than the pressure within said first chamber and opening the passage therethrough when the pressure conditions are reversed.
Claim 4
Dependent Claim
110 words
An expansible mandrel according to claim 1, further comprising a second hollow chamber at a distance from said first hollow chamber and pneumatically secluded therefrom, second passage means providing pneumatic communication between said second chamber and said hose members at a distance from said first passage means, each of said hoses having a second check valve opening allowing the passage of fluid therethrough when the pressure within the hose is greater than the pressure within said second chamber and closing the passage of fluid therethrough when the pressure conditions are reversed, a discharge opening in said second chamber and a valve controlling the flow of fluid through said discharge opening.
Claim 5
Dependent Claim
30 words
An expansible mandrel as claimed in claim 1 wherein said slots in said shaft have a T-shaped form, and said pressing elements in said slots have a corresponding T-shaped form.
Claim 6
Dependent Claim
30 words
An expansible mandrel as claimed in claim 1, wherein said hose members comprise a protective metal sheet arranged between the outer portion of said hose members and said pressing elements.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |