US4548423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal trailer hitch
Assignee: Individual
•
Filing: 1984-01-23
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Granted: 1985-10-22
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Expires: 2004-01-23
Abstract
Abstract A connecting device is disclosed for joining a trailer to a towing vehicle for substantial horizontal and vertical pivotal movements, as well as longitudinal rotation, of the trailer relative to the towing vehicle. A shaft added to one yoke of a pair of yokes comprising a universal joint is journalled in a block for rotation through 360 degrees. A similar shaft having a stop at its outer end and secured to the other yoke of the universal joint is inserted into a split block which functions as a quick-release clamping device upon closing of the block to secure the shaft. The bearing block preferably is affixed to the tongue or tow bar of the trailer and the split block is secured to the towing vehicle, the connecting device may be reversed end-for-end.
Inventors
- 👤 Trevor Craven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:39
CPC Classifications
B; B60; B60D; B60D1/00; B62; B62K; B62K27/00; B62K27/10; B62K27/12; B60D1/48; B60D1/54; B60D2001/542; B60D2001/548; Y; Y10; Y10T; Y10T403/00; Y10T403/60; Y10T403/608
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
227 words
A trailer hitch for detachably connecting a trailer to a towing vehicle comprising, in combination: a universal joint having a pair of pivotally interconnected yokes, each yoke having a longitudinal axis and mounted for pivotal movement about a transverse axis, a shaft secured to one yoke in axial alignment with the yoke longitudinal axis, a bearing block journalled on said shaft for rotation of the shaft therein, means for restraining said shaft from axial separation from said bearing block, a second shaft secured to the other yoke in axial alignment with the longitudinal axis of said yoke, said second shaft having a free end and an annular shoulder formed on said free end, a connector adapted to receive said second shaft for releasable engagement, said connector comprising a base having a longitudinal groove formed therein for receiving said second shaft, a closure member pivotally mounted on said base adapted to co-operate with the base when closed to rigidly lock the second shaft within the groove of the base of the connector, means for connecting one of said bearing block and said connector to the towing vehicle and means for connecting the other of said bearing block and connector to the trailer whereby said trailer is free to pivot horizontally and vertically relative to the towing vehicle and is free to rotate longitudinally relative to said towing vehicle.
Claim 2
Dependent Claim
227 words
A trailer hitch for detachably connecting a trailer to a towing vehicle comprising, in combination: a universal joint having a pair of pivotally interconnected yokes, each yoke having a longitudinal axis and mounted for pivotal movement about a transverse axis, a shaft secured to one yoke in axial alignment with the yoke longitudinal axis, a bearing block journalled on said shaft for rotation of the shaft therein, means for restraining said shaft from axial separation from said bearing block, a second shaft secured to the other yoke in axial alignment with the longitudinal axis of said yoke, said second shaft having a free end and an annular shoulder formed on said free end, a connector adapted to receive said second shaft for releasable engagement, said connector comprising a base having a longitudinal groove formed therein for receiving said second shaft, a closure member pivotally mounted on said base adapted to co-operate with the base when closed to rigidly lock the second shaft within the groove of the base of the connector, means for connecting one of said bearing block and said connector to the towing vehicle and means for connecting the other of said bearing block and connector to the trailer whereby said trailer is free to pivot horizontally and vertically relative to the towing vehicle and is free to rotate longitudinally relative to said towing vehicle.
Claim 3
Dependent Claim
50 words
A trailer hitch as claimed in claim 1 in which the second shaft has a transverse keyway formed thereon, and the closure member has a mating key adapted to be inserted into the keyway to prevent rotational movement of the second shaft within the connector when the connector is closed.
Claim 4
Dependent Claim
51 words
A trailer hitch as claimed in claim 1 in which said closure member has at least one threaded hole formed therein and a set screw adapted to be threaded into the hole for abutment on and engagement with the second shaft to prevent rotation of the second shaft within the connector.
Claim 5
Dependent Claim
51 words
A trailer hitch as claimed in claim 2 in which said closure member has at least one threaded hole formed therein and a set screw adapted to be threaded into the hole for abutment on and engagement with the second shaft to prevent rotation of the second shaft within the connector.
Claim 6
Dependent Claim
30 words
A trailer hitch as claimed in claim 2 in which the annular shoulder on the second shaft is formed integral on the free end thereof for abutment against the connector.
Claim 7
Dependent Claim
85 words
A trailer hitch as claimed in claim 6 in which the base has a transverse groove formed therein and the closure member has a mating transverse rib with a central recess adapted to seat in said transverse groove and straddle the second shaft, a slot formed in the transverse rib, and a locking lever pivotally mounted in said base adapted to pivot into and out of said slot for engagement therewith when the cover member is closed for locking said closure member on the base.
Claim 8
Dependent Claim
43 words
A trailer hitch as claimed in claim 6 in which the second shaft has a keyway formed thereon and a key is formed on the transverse rib adapted to seat in said keyway to prevent rotation of the second shaft within the connector.
Claim 9
Dependent Claim
51 words
A trailer hitch as claimed in claim 12 in which the closure member has at least one threaded hole formed therein and a set screw adapted to be threaded into the hole for abutment on and engagement with the second shaft to prevent rotation of the second shaft within the connector.
Claim 10
Dependent Claim
73 words
A trailer hitch as claimed in claim 6 in which a pair of spaced-apart slots are formed in the base in alignment with the slots formed in the rib of the cover member and straddling said rib when said cover member is closed, said locking lever being pivotally mounted within one of said spaced-apart slots for pivotal movement into the other two aligned slots for locking the closure member to the base member.
Claim 11
Dependent Claim
73 words
A trailer hitch as claimed in claim 8 in which a pair of spaced-apart slots are formed in the base in alignment with the slots formed in the rib of the cover member and straddling said rib when said cover member is closed, said locking lever being pivotally mounted within one of said spaced-apart slots for pivotal movement into the other two aligned slots for locking the closure member to the base member.
Claim 12
Dependent Claim
132 words
A trailer hitch as claimed in claim 6 in which a pair of spaced-apart slots are formed in the base in alignment with the slots formed in the rib of the cover member and straddling said rib when said cover member is closed, said locking lever being pivotally mounted within one of said spaced-apart slots for pivotal movement into the other two aligned slots for locking the closure member to the base member and in which an outwardly projecting tab is formed in the base adapted to overlie the free end of the locking lever when the closure member is locked, each of said tab and locking lever having a hole formed therein adapted to be aligned with each other for receiving a pin when the closure member is closed and locked.
Claim 13
Dependent Claim
132 words
A trailer hitch as claimed in claim 7 in which a pair of spaced-apart slots are formed in the base in alignment with the slots formed in the rib of the cover member and straddling said rib when said cover member is closed, said locking lever being pivotally mounted within one of said spaced-apart slots for pivotal movement into the other two aligned slots for locking the closure member to the base member and in which an outwardly projecting tab is formed in the base adapted to overlie the free end of the locking lever when the closure member is locked, each of said tab and locking lever having a hole formed therein adapted to be aligned with each other for receiving a pin when the closure member is closed and locked.
Claim 14
Dependent Claim
132 words
A trailer hitch as claimed in claim 8 in which a pair of spaced-apart slots are formed in the base in alignment with the slots formed in the rib of the cover member and straddling said rib when said cover member is closed, said locking lever being pivotally mounted within one of said spaced-apart slots for pivotal movement into the other two aligned slots for locking the closure member to the base member and in which an outwardly projecting tab is formed in the base adapted to overlie the free end of the locking lever when the closure member is locked, each of said tab and locking lever having a hole formed therein adapted to be aligned with each other for receiving a pin when the closure member is closed and locked.
References Cited (Backward Citations)
FR8982E
Cited
GB190115287A
Cited
US1934141A
Cited
US3552775A
Cited
US3730557A
Cited
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |