Patent US3978181A successfully refreshed from Google Patents.
US3978181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a foam plastic resin encased roller
Assignee: Individual
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Filing: 1974-05-31
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Granted: 1976-08-31
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Expires: 1994-05-31
Abstract
Abstract A method of making a unitary structure, such as, a conveyor idler, having a heat-sensitive subassembly with at least one moving part therein, such as, a lifetime lubricated bearing structure, wherein the subassembly is preassembled, the preassembled subassembly is placed in a mold, and a plastic, having a sufficiently low temperature of formation to prevent damage to the heat-sensitive subassembly and, upon hardening, a sufficient compressive strength to hold the subassembly together and form a pressure resistant unitary body, such as, a hard polyurethane foam having a compressive strength of at least about 90 kp/mm 2 , is formed about the subassembly. A protective covering, such as, a plastic sleeve, resistant to abrasion, can also be placed in the mold and made to adhere to and surround the outside surface of the unitary plastic body during the formation of the unitary plastic body.
Inventors
- 👤 Klaus-Heinrich Vahle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:17
CPC Classifications
F; F16; F16C; F16C13/00; F16C13/02; B; B29; B29C; B29C33/00; B29C33/0038; B29C33/0044; B29C39/00; B29C39/02; B29C39/10; B29C39/22; B29C39/26; B29C39/32; B29C44/00; B29C44/02; B29C44/12; B29C70/00; B29C70/68; B29C70/72; B29D; B29D99/00; B29D99/0032; B29D99/0035; B65; B65G; B65G39/00; B65G39/02; B65G39/09; B29L; B29L2031/00; B29L2031/32; B29L2031/324; F16H; F16H41/00; F16H41/24; F16H2041/246
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
182 words
A method of making a foamed plastic encased idler roll comprising the steps of assembling together an assembly composed of a shaft rotatable through 360°, and at each end of said shaft lubricated bearing means, bearing support means, labyrinth means surrounding said shaft between said bearing means and the ends of said shaft, sealing disk means surrounding said shaft on the opposite side of said bearing means from said labyrinth means, and spacer ring means surrounding each end of said shaft adjacent said sealing disc means, coaxially surrounding said assembly between said spacer ring means with a tubular body means to form an idler roll subassembly, placing said subassembly coaxially within a cylindrical mold cavity to thereby define an annular space between the surface of said mold cavity and the surface of said tubular body means, depositing a foamable thermosetting reaction mixture into said annular space, permitting said mixture to foam and cure, and unite with said idler roll subassembly to form a foam-encased idler roll, and removing said foam plastic-encased idler roll from said mold after said foamable mixture has cured.
Claim 2
Independent Claim
182 words
A method of making a foamed plastic encased idler roll comprising the steps of assembling together an assembly composed of a shaft rotatable through 360°, and at each end of said shaft lubricated bearing means, bearing support means, labyrinth means surrounding said shaft between said bearing means and the ends of said shaft, sealing disk means surrounding said shaft on the opposite side of said bearing means from said labyrinth means, and spacer ring means surrounding each end of said shaft adjacent said sealing disc means, coaxially surrounding said assembly between said spacer ring means with a tubular body means to form an idler roll subassembly, placing said subassembly coaxially within a cylindrical mold cavity to thereby define an annular space between the surface of said mold cavity and the surface of said tubular body means, depositing a foamable thermosetting reaction mixture into said annular space, permitting said mixture to foam and cure, and unite with said idler roll subassembly to form a foam-encased idler roll, and removing said foam plastic-encased idler roll from said mold after said foamable mixture has cured.
Claim 3
Dependent Claim
15 words
A method in accordance with claim 1 wherein the plastic is a hard foam plastic.
Claim 4
Dependent Claim
15 words
A method in accordance with claim 2 wherein the hard foam plastic is polyurethane foam.
Claim 5
Dependent Claim
14 words
A method in accordance with claim 1 wherein said subassembly includes a ball bearing.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1 wherein the unitary structure is a conveyor idler.
Claim 7
Dependent Claim
23 words
A method in accordance with claim 1 wherein the exterior of the plastic unitary body has a protective covering about its outer surface.
Claim 8
Dependent Claim
14 words
A method in accordance with claim 6 wherein the covering is a plastic sleeve.
Claim 9
Dependent Claim
12 words
A method in accordance with claim 6 wherein the covering is abrasion-resistant.
References Cited (Backward Citations)
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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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |