US3875654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an oil seal
Assignee: Nok Corp
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Filing: 1973-10-26
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Granted: 1975-04-08
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Expires: 1993-10-26
Abstract
Abstract An oil seal comprising a metal ring having an axially extending portion and a radial portion, with the radial portion including a bent portion near its free edge. Resilient sealing material is bonded to the axially extending portion to form a static seal portion and to the free edge of the radial portion to form a dynamic seal portion, the two seal portions being separated by exposed annular opposite side surfaces of the metal ring between the axially extending portion and the bent portion thereof. The dynamic seal portion has a plurality of circumferentially and uniformly spaced small apertures formed therein. The oil seal is formed by a process which concurrently effects bonding of the resilient sealing material to the metal ring and formation of the bent portion therein.
Inventors
- 👤 Masahiko Ushijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:55
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/328; Y; Y10; Y10S; Y10S277/00; Y10S277/924; Y10S425/00; Y10S425/047; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
242 words
A method of manufacturing an oil seal, which comprises supporting between an upper die and a lower die of a forming press a metal ring, a first portion of resilient material and a second portion of resilient material, said upper die having an annular lower projection, said lower die having an annular upper projection, said metal ring having an axially extending portion and a radial portion extending substantially at right angles to said axially extending portion and being supported near its free edge on said upper projection of said lower die, said first portion of resilient material being supported adjacent said axially extending portion of said ring and said second portion of resilient material being supported adjacent said radial portion of said ring, and moving said upper die and said lower die relatively toward each other so as to cause said first and second portions of resilient material to migrate toward and become bonded respectively to said axially extending portion and said radial portion of said ring thereby forming respective static and dynamic seal portions defining between them annular exposed surfaces on opposite sides of said radial portion of said ring, said relative movement of said upper and lower dies also causing said lower projection of said upper die and said upper projection of said lower die to cooperatively act upon said radial portion of said ring so as to form a bent portion near the free edge of said radial portion.
Claim 2
Independent Claim
242 words
A method of manufacturing an oil seal, which comprises supporting between an upper die and a lower die of a forming press a metal ring, a first portion of resilient material and a second portion of resilient material, said upper die having an annular lower projection, said lower die having an annular upper projection, said metal ring having an axially extending portion and a radial portion extending substantially at right angles to said axially extending portion and being supported near its free edge on said upper projection of said lower die, said first portion of resilient material being supported adjacent said axially extending portion of said ring and said second portion of resilient material being supported adjacent said radial portion of said ring, and moving said upper die and said lower die relatively toward each other so as to cause said first and second portions of resilient material to migrate toward and become bonded respectively to said axially extending portion and said radial portion of said ring thereby forming respective static and dynamic seal portions defining between them annular exposed surfaces on opposite sides of said radial portion of said ring, said relative movement of said upper and lower dies also causing said lower projection of said upper die and said upper projection of said lower die to cooperatively act upon said radial portion of said ring so as to form a bent portion near the free edge of said radial portion.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |