Patent US3837042A successfully refreshed from Google Patents.
US3837042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivots
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1973-03-16
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Granted: 1974-09-24
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Expires: 1993-03-16
Abstract
Abstract A window or door pivot in which a first bearing member has a bearing surface which is in frictional engagement with a bearing surface of a second bearing member, the bearing surfaces being of materials between which the static friction is low and is similar to the dynamic friction, means being provided for generating and maintaining a high interfacial pressure between the bearing members. Suitable materials for the bearing surfaces are for example chromium plating, brass or stainless steel for one of the bearing surfaces and an acetal polymer for the other of the bearing surface.
Inventors
- 👤 W White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:08
CPC Classifications
F; F16; F16C; F16C25/00; F16C25/02; E; E05; E05D; E05D11/00; E05D11/08; E05D11/082; E05D7/00; E05D7/08; E05D7/081; E05D7/082; E05D7/083; F16C11/00; F16C11/04; F16C11/10; F16C11/103; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; E05Y2900/148
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A pivot bearing assembly comprising inner and outer members having cooperating cylindrical bearing surfaces wherein the material of one of the surfaces is metallic and the material of the other surface is acetal polymer, and taper plug means for resiliently expanding the bearing surface of the inner member to apply and maintain a high interfacial pressure between the bearing surfaces, the static friction between said bearing friction surfaces being low and similar to the dynamic friction therebetween whereby, when a high interfacial pressure is maintained, operation of the pivot is smooth and quiet and free of a stick-slip effect.
Claim 2
Dependent Claim
99 words
A pivot bearing assembly comprising inner and outer members having cooperating cylindrical bearing surfaces wherein the material of one of the surfaces is metallic and the material of the other surface is acetal polymer, and taper plug means for resiliently expanding the bearing surface of the inner member to apply and maintain a high interfacial pressure between the bearing surfaces, the static friction between said bearing friction surfaces being low and similar to the dynamic friction therebetween whereby, when a high interfacial pressure is maintained, operation of the pivot is smooth and quiet and free of a stick-slip effect.
Claim 3
Dependent Claim
27 words
A pivot bearing assembly according to claim 1 wherein the material of the metallic surface is selected from the group consisting of chromium, brass and stainless steel.
Claim 4
Dependent Claim
61 words
A pivot bearing assembly according to claim 1 wherein the taper plug means, being adapted for rotation by an adjusting tool, is screw threaded and in engagement with a complementary taper screw threaded socket in the inner member, the wall which bounds the taper screw threaded socket being slit to facilitate radial expansion of the bearing surface of the inner member.
Claim 5
Dependent Claim
17 words
A pivot bearing assembly according to claim 2 wherein the bearing surface of inner member is metallic.
Claim 6
Dependent Claim
18 words
A pivot bearing assembly according to claim 2 wherein the bearing surface of the outer member is metallic.
Claim 7
Dependent Claim
122 words
A pivot bearing assembly comprising inner and outer members having cooperating cylindrical bearing surfaces wherein the material of one of the surfaces is metallic and the material of the other surface is acetal polymer, a frustro-conical plug slidable within a complementrary frustro-conical bore in the inner member for radially and resiliently expanding the bearing surface of the inner member to apply and maintain a high interfacial pressure between the bearing surfaces, and screw thread means for urging the plug along the frustro-conical bore, the static friction between said bearing friction surfaces being low and similar to the dynamic friction therebetween whereby, when a high interfacial pressure is maintained, operation of the pivot is smooth and quiet and free of a stick-slip effect.
Claim 8
Dependent Claim
122 words
A pivot bearing assembly comprising inner and outer members having cooperating cylindrical bearing surfaces wherein the material of one of the surfaces is metallic and the material of the other surface is acetal polymer, a frustro-conical plug slidable within a complementrary frustro-conical bore in the inner member for radially and resiliently expanding the bearing surface of the inner member to apply and maintain a high interfacial pressure between the bearing surfaces, and screw thread means for urging the plug along the frustro-conical bore, the static friction between said bearing friction surfaces being low and similar to the dynamic friction therebetween whereby, when a high interfacial pressure is maintained, operation of the pivot is smooth and quiet and free of a stick-slip effect.
Claim 9
Dependent Claim
34 words
A pivot bearing assembly according to claim 6 wherein the wall which bounds the frustro-Conical bore of the inner member is slit to facilitate radial expansion of the bearing surface of the inner member.
Claim 10
Dependent Claim
51 words
A pivot bearing assembly according to claim 6 wherein the inner member comprises acetal polymer and the inner member has a bolt comprising the frustro-conical plug and screw thread means, the bolt engaging with a complementary helical screw thread formed in an extension to the frustro-conical bore of the inner member.
Claim 11
Dependent Claim
44 words
A pivot bearing assembly according to claim 6 wherein the screw thread means is a bolt engaging with a screw thread in the frustro-conical plug and the frustro-conical bore in the inner member has an internal abutment flange for the head of the bolt.
Claim 12
Dependent Claim
85 words
A pivot bearing assembly according to claim 7 wherein the frustro-conical bore has a screw threaded extension, the screw thread means for urging the frustro-conical plug along the bore in the inner members comprises a pin having a first screw thread complementary to the screw threaded extension and a second screw thread of smaller pitch than the first screw thread, the second screw thread being engaged by a complementary screw thread in the frustro-conical plug, the pin being adapted for engagement with an adjusting tool.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |