Patent US4781394A successfully refreshed from Google Patents.
US4781394A
Expired / Lapsed
US
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Trailer hitch guide
Assignee: Universal Concepts Inc
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Filing: 1987-05-29
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Granted: 1988-11-01
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Expires: 2007-05-29
Abstract
Abstract A trailer hitch for attachment to a vehicle bumper for providing releasable coupling with a trailer coupling member. The hitch includes a coupling ball partially surrounded by an enclosure extending above the top of the coupling ball. A safety bar is received in slots formed in the surrounding wall. The safety bar, when installed, overlies the coupled arrangement of a ball joint and trailer coupling member so as to prevent their unintended separation. Further, the walls surrounding the coupling ball are pivotally mounted to the vehicle bumper and include a spring which contacts either the vehicle or its bumper to orient the enclosing walls in a preferred direction.
Inventors
- 👤 Peter W. Schwarz
- 👤 Lance L. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:05
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/24; B60D1/36; B60D1/363
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A trailer hitch for attachment to a bumper of a vehicle so as to provide releasable coupling with a trailer coupling member, said hitch comprising: a coupling ball having a top and means for attachment to the bumper; partial enclosure means partly surrounding said coupling ball having a wall portion extending above the top of said coupling ball and defining slot means for receiving a safety bar, said partial enclosure means further having means for attachment to the bumper; and safety bar means receivable in said slot means so as to supported by said wall portion in overlying relationship with said coupling ball when said coupling ball is coupled to a trailer coupling member interposed between said coupling ball and said safety bar means, whereby unintentional uncoupling of said coupling ball and the trailer coupling member is prevented.
Claim 2
Dependent Claim
138 words
A trailer hitch for attachment to a bumper of a vehicle so as to provide releasable coupling with a trailer coupling member, said hitch comprising: a coupling ball having a top and means for attachment to the bumper; partial enclosure means partly surrounding said coupling ball having a wall portion extending above the top of said coupling ball and defining slot means for receiving a safety bar, said partial enclosure means further having means for attachment to the bumper; and safety bar means receivable in said slot means so as to supported by said wall portion in overlying relationship with said coupling ball when said coupling ball is coupled to a trailer coupling member interposed between said coupling ball and said safety bar means, whereby unintentional uncoupling of said coupling ball and the trailer coupling member is prevented.
Claim 3
Dependent Claim
42 words
The trailer hitch of claim 1 wherein said partial enclosure means includes a base member pivotally mounted to said bumper and said trailer hitch further includes means for alternately locking said partial enclosure means and said locking bar in respective selected positions.
Claim 4
Dependent Claim
76 words
The trailer hitch of claim 2 wherein said base member and said safety bar include pin-receiving apertures and said means for alternately locking comprises a locking pin alternately receivable in pin-receiving aperture means defined in said base member and in said bumper to prevent relative movement therebetween and in pin-receiving aperture means in said safety bar to prevent withdrawal of said safety bar through said wall portion slot means when said safety bar is received therein.
Claim 5
Dependent Claim
62 words
The trailer hitch of claim 3 wherein said safety bar has a body portion and a first end of cross-sectional dimension for insertion through said partial enclosure slot means, said safety bar further including a second opposed end dimensioned to block passage through said partial enclosure slot means, and said first end defining the pin-receiving aperture means for receiving said locking pin.
Claim 6
Dependent Claim
107 words
The trailer hitch of claim 1 wherein said partial enclosure means includes an upstanding wall between said coupling ball and at least one of the bumper and the vehicle, said means for attaching the partial enclosure means to the bumper pivotally mounting said partial enclosure means to the bumper so as to provide pivotal movement thereof between first and second positions, said hitch further comprising: spring means mounted to said upstanding wall for contacting at least one of the bumper and the vehicle when said partial enclosure means is pivoted away from the first position, said spring means biases said partial enclosure means toward that first position.
Claim 7
Dependent Claim
27 words
The trailer hitch of claim 5 wherein said spring means includes end portions for contacting said vehicle and an intermediate portion for mounting to said upstanding wall.
Claim 8
Dependent Claim
88 words
The trailer hitch of claim 1 wherein said means for attaching said coupling ball to a bumper includes a threaded shaft having a cross-section dimensioned to be received in an aperture defined in the bumper, said partial enclosure means including a base member defining a bushing-receiving aperture significantly larger than the cross-sectional dimension of said threaded shaft, said hitch including eccentric bushing means receivable in said base member and defining an inner shaft-receiving aperture for receiving said coupling ball shaft, eccentrically located with respect to said bushing-receiving aperture.
Claim 9
Dependent Claim
91 words
The trailer hitch of claim 7 wherein said eccentric bushing means comprises a stepped washer defining said inner shaft-receiving aperture and two outer portions of different diameter, the smaller diameter portion dimensioned to be received in said bushing-receiving aperture, with the larger diameter portion overlying said base member so as to receive bearing support from said swivel plate, said inner shaft-receiving aperture eccentrically positioned with respect to the smaller outer portion of said stepped washer to provide an adjustment in the position of said base member relative to said vehicle bumper.
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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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |