Patent US3887251A successfully refreshed from Google Patents.
US3887251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor and trailer fifth wheel bearing attachment
Assignee: Individual
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Filing: 1974-08-06
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Granted: 1975-06-03
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Expires: 1994-08-06
Abstract
Abstract A preassembled bearing element including lubricated plates attachable directly to the trailer plates of existing fifth wheel rigs.
Inventors
- 👤 Roy H Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:23
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0885; B62D53/0842
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
178 words
In a fifth wheel assembly including an upper trailer plate mounting a king pin and a lower slotted tractor plate adapted for locking engagement with said king pin, the improvement comprising an anti-friction device between said fifth wheel plates, said device comprising a bushing journaled on the king pin, a first bearing plate detachably secured to the upper trailer plate, said first bearing plate being centrally apertured for receiving the upper end portion of said bushing, a flange at the bottom of said bushing, a second bearing plate mounted for rotation on said flanged bushing, a split washer connected to the second bearing plate and engaging the flange of the bushing for holding the bushing in operative position on said king pin, said second bearing plate being frictionally engageable with and by said tractor plate and rotatable therewith, and a third plate positioned between said first and second bearing plates and mounted for free rotation about the bushing, said third plate incorporating lubricating means on both surfaces to substantially eliminate friction between said first and second bearing plates.
Claim 2
Dependent Claim
178 words
In a fifth wheel assembly including an upper trailer plate mounting a king pin and a lower slotted tractor plate adapted for locking engagement with said king pin, the improvement comprising an anti-friction device between said fifth wheel plates, said device comprising a bushing journaled on the king pin, a first bearing plate detachably secured to the upper trailer plate, said first bearing plate being centrally apertured for receiving the upper end portion of said bushing, a flange at the bottom of said bushing, a second bearing plate mounted for rotation on said flanged bushing, a split washer connected to the second bearing plate and engaging the flange of the bushing for holding the bushing in operative position on said king pin, said second bearing plate being frictionally engageable with and by said tractor plate and rotatable therewith, and a third plate positioned between said first and second bearing plates and mounted for free rotation about the bushing, said third plate incorporating lubricating means on both surfaces to substantially eliminate friction between said first and second bearing plates.
Claim 3
Dependent Claim
178 words
In a fifth wheel assembly including an upper trailer plate mounting a king pin and a lower slotted tractor plate adapted for locking engagement with said king pin, the improvement comprising an anti-friction device between said fifth wheel plates, said device comprising a bushing journaled on the king pin, a first bearing plate detachably secured to the upper trailer plate, said first bearing plate being centrally apertured for receiving the upper end portion of said bushing, a flange at the bottom of said bushing, a second bearing plate mounted for rotation on said flanged bushing, a split washer connected to the second bearing plate and engaging the flange of the bushing for holding the bushing in operative position on said king pin, said second bearing plate being frictionally engageable with and by said tractor plate and rotatable therewith, and a third plate positioned between said first and second bearing plates and mounted for free rotation about the bushing, said third plate incorporating lubricating means on both surfaces to substantially eliminate friction between said first and second bearing plates.
Claim 4
Dependent Claim
178 words
In a fifth wheel assembly including an upper trailer plate mounting a king pin and a lower slotted tractor plate adapted for locking engagement with said king pin, the improvement comprising an anti-friction device between said fifth wheel plates, said device comprising a bushing journaled on the king pin, a first bearing plate detachably secured to the upper trailer plate, said first bearing plate being centrally apertured for receiving the upper end portion of said bushing, a flange at the bottom of said bushing, a second bearing plate mounted for rotation on said flanged bushing, a split washer connected to the second bearing plate and engaging the flange of the bushing for holding the bushing in operative position on said king pin, said second bearing plate being frictionally engageable with and by said tractor plate and rotatable therewith, and a third plate positioned between said first and second bearing plates and mounted for free rotation about the bushing, said third plate incorporating lubricating means on both surfaces to substantially eliminate friction between said first and second bearing plates.
Claim 5
Dependent Claim
46 words
An anti-friction device according to claim 1, wherein a ring member is positioned between the first and second bearing plates and encircling the third plate, said ring member being fixedly attached to the second bearing plate and having free sliding contact with the first bearing plate.
Claim 6
Dependent Claim
36 words
An anti-friction device according to claim 2, wherein the lubricating means comprises a plurality of radial grooves formed on the upper and lower surfaces of the third plate, and means for introducing lubricant into said grooves.
Claim 7
Dependent Claim
24 words
An anti-friction device according to claim 3, wherein the means for introducing lubricant into said grooves comprises grease fittings connected to said ring member.
Claim 8
Dependent Claim
38 words
An anti-friction device according to claim 3, wherein a sealing ring is interposed the ring member and the first bearing plate to prevent leakage of lubricant in the vicinity of the ring member and the first bearing plate.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |