Patent US3741588A successfully refreshed from Google Patents.
US3741588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer hitch
Assignee: Fisher Group Inc
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Filing: 1972-02-14
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Granted: 1973-06-26
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Expires: 1992-02-14
Abstract
Abstract A trailer hitch comprising a pair of parallel horizontal plates, each having curvilinear projections therefrom and the projections penetrating selected openings provided in an attachment surface, such as a vehicle bumper or extension from the frame, transverse to the horizontal plates. The projections are tilted into the openings to bear on the opposite side of the web of the bumper or frame extension from the plates. Thus the horizontal plates are positioned in relative parallel spaced registry relation. The trailer ball serves as a stud and extends through both registering plates and upon tightening partially closes the space between the plates and secures the hitch in compression relation relative to the attachment surface such as the bumper or frame extension.
Inventors
- 👤 W Dotterweich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:59
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/48; B60D1/485; B60D1/01; B60D1/06; B60D1/52; B60D1/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A trailer hitch comprising: a pair of horizontal plates and each having a pair of curvilinear projections of a configuration to pass through registering openings in a substantially vertical wall of a bumper; a bumper element having a vertical wall portion and openings therethrough and through which said projections of said plates may be selectively passed so that said plates are supported by said bumper wall in a parallel relation; and a hitch stud passing through both of said plates in parallel register each with the other and compressing said projections and said plates against said vertical wall.
Claim 2
Dependent Claim
98 words
A trailer hitch comprising: a pair of horizontal plates and each having a pair of curvilinear projections of a configuration to pass through registering openings in a substantially vertical wall of a bumper; a bumper element having a vertical wall portion and openings therethrough and through which said projections of said plates may be selectively passed so that said plates are supported by said bumper wall in a parallel relation; and a hitch stud passing through both of said plates in parallel register each with the other and compressing said projections and said plates against said vertical wall.
Claim 3
Dependent Claim
25 words
The trailer hitch of claim 1 wherein the horizontal plates have serpentine curvilinear projections which extend rearwardly and transversely of the plane of said plates.
Claim 4
Dependent Claim
46 words
The trailer hitch of claim 1 wherein the contact point of said curvilinear projection with said wall and said plates at contact with said wall is equal to the thickness of said wall whereby said plates project horizontally from said wall in spaced apart parallel relation.
Claim 5
Dependent Claim
126 words
A quickly dismountable trailer hitch of the ball type secured in position by a single fastener comprising: an upper horizontal plate having a projecting portion therefrom and a rear edge; a lower horizontal plate having a projecting portion therefrom and a rear edge, said lower plate being positioned in opposed spaced apart registry with said upper plate and said projections curved transversely from said plates; a substantial vertical wall having openings therethrough and through which said projections extend and said projections bear against said wall when said plates are in spaced parallel face to face relation engaging the other side of said wall; and a ball stud element extending upwardly through said plates and securing said plates in compression relation to each other and said wall.
Claim 6
Dependent Claim
126 words
A quickly dismountable trailer hitch of the ball type secured in position by a single fastener comprising: an upper horizontal plate having a projecting portion therefrom and a rear edge; a lower horizontal plate having a projecting portion therefrom and a rear edge, said lower plate being positioned in opposed spaced apart registry with said upper plate and said projections curved transversely from said plates; a substantial vertical wall having openings therethrough and through which said projections extend and said projections bear against said wall when said plates are in spaced parallel face to face relation engaging the other side of said wall; and a ball stud element extending upwardly through said plates and securing said plates in compression relation to each other and said wall.
Claim 7
Dependent Claim
159 words
A Ball type trailer hitch comprising: an upper horizontal support plate and including curvilinear projections extending from one side of said upper plate and transversely upwardly on a gentle S curve of serpentine configuration; a lower horizontal support plate positioned in substantially parallel spaced register with said upper plate and said lower plate including a plurality of curvilinear projections extending from one side of said lower plate and downwardly in a gentle S curve configuration; a substantially vertical support wall having openings therethrough in registry with said projections and against which the said upper and lower plates bear on one side and said curvilinear projections bear on the other when said plates are in parallel horizontal relation; and a ball hitch stud element in clamping relation through said upper and lower support plates which upon tightening urges said plates toward each other and the consequent tilt thereof urging said projections into tight bias relation against said vertical support wall.
Claim 8
Dependent Claim
159 words
A Ball type trailer hitch comprising: an upper horizontal support plate and including curvilinear projections extending from one side of said upper plate and transversely upwardly on a gentle S curve of serpentine configuration; a lower horizontal support plate positioned in substantially parallel spaced register with said upper plate and said lower plate including a plurality of curvilinear projections extending from one side of said lower plate and downwardly in a gentle S curve configuration; a substantially vertical support wall having openings therethrough in registry with said projections and against which the said upper and lower plates bear on one side and said curvilinear projections bear on the other when said plates are in parallel horizontal relation; and a ball hitch stud element in clamping relation through said upper and lower support plates which upon tightening urges said plates toward each other and the consequent tilt thereof urging said projections into tight bias relation against said vertical support wall.
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |