US3576326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing seal and method of making same
Assignee: FMC Corp
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Filing: 1969-03-10
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Granted: 1971-04-27
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Expires: 1989-03-10
Abstract
Abstract A foamed-in-place polyurethane cavity seal is provided to fill the cavity existing at the joint where a rotating auger is journaled in a flanged roller bearing unit. The relatively large diameter tubular outer auger shaft extends axially beyond the point at which an inner drive shaft of the auger enters the bearing unit, said outer tube being disposed around the bearing to substantially enclose it and define the cavity, which is to be filled by the subject polyurethane seal, between the bearing unit and the inner walls of the outer tube. The cavity seal is made by completely sealing off the cavity, pouring liquid polyurethane through an unplugged access hole in the auger tube, replugging the access hole and allowing the polyurethane to cure and expand within the cavity at room temperature.
Inventors
- 👤 Eugene R Hafner
- 👤 Raymond A Kern
- 👤 William D Shupe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:44
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/328; Y; Y10; Y10S; Y10S277/00; Y10S277/922; Y10S277/924
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
An improved joint for preventing entrance of foreign material comprising in combination a first stationary member, a second movable member in mating relationship with said first member, said members having a cavity therebetween, a bonding compound on one of said members, a parting compound on the other of said members, and an expansible-in-place polyurethane seal to close said cavity, said seal form fitting the inner surfaces of said cavity.
Claim 2
Dependent Claim
69 words
An improved joint for preventing entrance of foreign material comprising in combination a first stationary member, a second movable member in mating relationship with said first member, said members having a cavity therebetween, a bonding compound on one of said members, a parting compound on the other of said members, and an expansible-in-place polyurethane seal to close said cavity, said seal form fitting the inner surfaces of said cavity.
Claim 3
Independent Claim
72 words
The method of making a seal to fill the open cavity between a first stationary member and a surrounding movable second member comprising the steps of coating the stationary surfaces within the said cavity with an adhesive compound, coating the movable surfaces within the said cavity with a parting compound, pouring liquid polyurethane into the said cavity, closing the cavity, and curing the polyurethane to let it expand within the said cavity.
Claim 4
Independent Claim
72 words
The method of making a seal to fill the open cavity between a first stationary member and a surrounding movable second member comprising the steps of coating the stationary surfaces within the said cavity with an adhesive compound, coating the movable surfaces within the said cavity with a parting compound, pouring liquid polyurethane into the said cavity, closing the cavity, and curing the polyurethane to let it expand within the said cavity.
Claim 5
Independent Claim
73 words
The method of making a seal to fill an open cavity between a first member and a relatively movable second member leaving a channel through the seal comprising the steps of inserting an elongated member into said cavity, pouring liquid polyurethane into the said cavity and around said elongated member, closing the cavity, curing the polyurethane to let it expand within the cavity, and removing the elongated member after the polyurethane has cured.
Claim 6
Independent Claim
73 words
The method of making a seal to fill an open cavity between a first member and a relatively movable second member leaving a channel through the seal comprising the steps of inserting an elongated member into said cavity, pouring liquid polyurethane into the said cavity and around said elongated member, closing the cavity, curing the polyurethane to let it expand within the cavity, and removing the elongated member after the polyurethane has cured.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |