US3713932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making low friction fabric lined nuts of multiple length construction
Assignee: Rexnord Inc
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Filing: 1970-12-15
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Granted: 1973-01-30
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Expires: 1990-12-15
Abstract
Abstract A low friction fabric sleeve is wrapped with cords on a long threaded mandrel. The assembly is heated to preset the fabric. A tubular body of resin and glass filament reinforcing is formed over the sleeve and when completed and unscrewed from the mandrel, is cut to the lengths of the desired nuts or internally threaded parts. The tips of the screw threads may include the cords which were wound under tension to form the sleeve on the mandrel.
Inventors
- 👤 N Butzow
- 👤 B Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/583; B29C53/585; B29D; B29D1/00; B29D1/005; B29L; B29L2001/00; B29L2001/005; F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/24; F16H2025/249; Y; Y10; Y10S; Y10S411/00; Y10S411/904; Y10S411/908
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
220 words
A method of making a low-friction material lined internally-threaded glass-filament reinforced thermo-resin plastic body in the form of a nut which comprises: the steps of providing a rigid threaded rod for a mandrel, providing a lining in the form of a heat-settable circumferentially shrinkable fabric sleeve having on inner low-friction surface, drawing said sleeve over the mandrel and progressively conforming the sleeve to the mandrel with corresponding portions thereof extending to the roots of the mandrel screw threads, then heating the assembly to preset the sleeve in conformance with the threads by allowing the assembly to cool so that the sleeve shrinks and sets closely fitting the mandrel threads, progressively winding under tension over the sleeve one or more groups of resin-carrying glass filaments to fully fill the space between the thread and press the sleeve to the mandrel screw threads and, securing the ends of said filaments to the ends of the mandrel, winding over the assembly in overlying layers glass filaments carrying liquid resin to the assembly to form an outer body, curing the resin to form a rigid tube fitting the mandrel with the low friction sleeve facing and conforming thereto, removing the mandrel from the tube by relatively rotating the same, and cutting the tube into individual lengths of the desire size to produce individual nuts.
Claim 2
Independent Claim
220 words
A method of making a low-friction material lined internally-threaded glass-filament reinforced thermo-resin plastic body in the form of a nut which comprises: the steps of providing a rigid threaded rod for a mandrel, providing a lining in the form of a heat-settable circumferentially shrinkable fabric sleeve having on inner low-friction surface, drawing said sleeve over the mandrel and progressively conforming the sleeve to the mandrel with corresponding portions thereof extending to the roots of the mandrel screw threads, then heating the assembly to preset the sleeve in conformance with the threads by allowing the assembly to cool so that the sleeve shrinks and sets closely fitting the mandrel threads, progressively winding under tension over the sleeve one or more groups of resin-carrying glass filaments to fully fill the space between the thread and press the sleeve to the mandrel screw threads and, securing the ends of said filaments to the ends of the mandrel, winding over the assembly in overlying layers glass filaments carrying liquid resin to the assembly to form an outer body, curing the resin to form a rigid tube fitting the mandrel with the low friction sleeve facing and conforming thereto, removing the mandrel from the tube by relatively rotating the same, and cutting the tube into individual lengths of the desire size to produce individual nuts.
Claim 3
Dependent Claim
35 words
A method as in claim 1 wherein the step of conforming the sleeve to the mandrel is accomplished by wrapping heat resistant cords over the sleeve and into the roots of the mandrel screw threads.
Claim 4
Dependent Claim
21 words
A method as in claim 2 wherein the wrapping cords are removed prior to further winding of the resin-carrying glass filaments.
References Cited (Backward Citations)
US2751237A
Cited
FR1340914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |