Patent US1234243A successfully refreshed from Google Patents.
Patent US4049288A successfully refreshed from Google Patents.
US4049288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer hitch
Assignee: Hoover Universal Inc
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Filing: 1976-08-11
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Granted: 1977-09-20
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Expires: 1996-08-11
Abstract
Abstract A weight distribution trailer hitch which has a pair of spring rods pivotally connected at their forward ends on vertical-axis pivot means adjacent the hitch ball and at their forward ends in a tensioned relation to the trailer tongue. The pivotal mounting for the forward ends of the spring rods is such that the spring rods are the same and are interchangeable and easily replaceable.
Inventors
- 👤 David A. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:54
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/24; B60D1/247; B60D1/30; B60D1/34; B60D1/345
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
264 words
A trailer hitch having a ball for use with a socket of a trailer tongue to provide an articulated joint between an automobile on which the hitch is mounted and a trailer on which the trailer tongue is mounted, comprising a pair of substantially vertial-axis pivot means mounted adjacent to said ball at laterally opposite sides thereof, a pair of normally straight spring rods having angular end portions rotatably mounted in said pivot means for lateral pivotal movement of said rods, a pair of generally vertically disposed flexible suspension members having the corresponding ends thereof attached to the free ends of said rods, and means for mounting on the trailer tongue above said rods engaged by said flexible suspension members for bending said spring rods, said pivot means and said angular end portions having cooperating means preventing axial displacement of said angular end portions, the cooperating means of each pivot means and its associated angular end portion including a cicumferentially extending groove near the terminal end of said end portion, a transverse opening in the associated pivot means having an axis extending tangentially through said groove, and a removable retaining clip having a leg extending through said opening and said groove for preventing axial displacement of the angular end portion relative to its associated pivot means, each said angular end portion having a circumferentially extending groove which extends partially around its circumference sufficient to allow said lateral pivotal movement and at a location the same as that of the angular end portion of the other spring rod so that said spring rods are interchangeable.
Claim 2
Dependent Claim
264 words
A trailer hitch having a ball for use with a socket of a trailer tongue to provide an articulated joint between an automobile on which the hitch is mounted and a trailer on which the trailer tongue is mounted, comprising a pair of substantially vertial-axis pivot means mounted adjacent to said ball at laterally opposite sides thereof, a pair of normally straight spring rods having angular end portions rotatably mounted in said pivot means for lateral pivotal movement of said rods, a pair of generally vertically disposed flexible suspension members having the corresponding ends thereof attached to the free ends of said rods, and means for mounting on the trailer tongue above said rods engaged by said flexible suspension members for bending said spring rods, said pivot means and said angular end portions having cooperating means preventing axial displacement of said angular end portions, the cooperating means of each pivot means and its associated angular end portion including a cicumferentially extending groove near the terminal end of said end portion, a transverse opening in the associated pivot means having an axis extending tangentially through said groove, and a removable retaining clip having a leg extending through said opening and said groove for preventing axial displacement of the angular end portion relative to its associated pivot means, each said angular end portion having a circumferentially extending groove which extends partially around its circumference sufficient to allow said lateral pivotal movement and at a location the same as that of the angular end portion of the other spring rod so that said spring rods are interchangeable.
Claim 3
Dependent Claim
258 words
A trailer hitch having a ball for use with a socket of a trailer tongue to provide an articulate joint between an automobile on which the hitch is mounted and a trailer on which the trailer tongue is mounted, comprising a pair of substantially vertical-axis pivot means mounted adjacent to said ball at laterally opposite sides thereof, a pair of normally straight spring rods having angular end portions rotatably mounted in said pivot means for lateral pivotal movement of said rods, a pair of generally vertically disposed flexible suspension members having the corresponding ends thereof attached to the free ends of said rods, and means for mounting on the trailer tongue above said rods engaged by said flexible suspension members for bending said spring rods, said pivot means and said angular end portions having cooperating means preventing axial displacement of said angular end portions, the cooperating means of each pivot means and its associated angular end portion including a circumferentially extending groove near the terminal end of said end portion, a transverse opening in the associated pivot means having an axis extending tangentially through said groove, and a removable retaining clip having a leg extending through said opening and said groove for preventing axial displacement of the angular end portion relative to its associated pivot means, each of said pivot means including a socket tube in which a transverse groove has been cut, and a block member extending partially into said transverse groove and welded to said socket tube to define with the socket tube said transverse opening.
Claim 4
Dependent Claim
258 words
A trailer hitch having a ball for use with a socket of a trailer tongue to provide an articulate joint between an automobile on which the hitch is mounted and a trailer on which the trailer tongue is mounted, comprising a pair of substantially vertical-axis pivot means mounted adjacent to said ball at laterally opposite sides thereof, a pair of normally straight spring rods having angular end portions rotatably mounted in said pivot means for lateral pivotal movement of said rods, a pair of generally vertically disposed flexible suspension members having the corresponding ends thereof attached to the free ends of said rods, and means for mounting on the trailer tongue above said rods engaged by said flexible suspension members for bending said spring rods, said pivot means and said angular end portions having cooperating means preventing axial displacement of said angular end portions, the cooperating means of each pivot means and its associated angular end portion including a circumferentially extending groove near the terminal end of said end portion, a transverse opening in the associated pivot means having an axis extending tangentially through said groove, and a removable retaining clip having a leg extending through said opening and said groove for preventing axial displacement of the angular end portion relative to its associated pivot means, each of said pivot means including a socket tube in which a transverse groove has been cut, and a block member extending partially into said transverse groove and welded to said socket tube to define with the socket tube said transverse opening.
Claim 5
Dependent Claim
33 words
The trailer hitch that is defined in claim 2, wherein each said angular end portion has a circumferentially extending groove which extends 360° around its circumference so that said spring rods are interchangeable.
Claim 6
Dependent Claim
41 words
The trailer hitch that is defined in claim 2, wherein said block has a straight wall surface parallel to said axis of the transverse opening, and said leg of the retaining clip is straight and fits against the straight wall surface.
Claim 7
Dependent Claim
57 words
The trailer hitch that is defined in claim 2, wherein each said angular end portion has a circumferentially extending groove which extends partially around its circumference sufficient to allow said lateral pivotal movement and at a location the same as that of the angular end portion of the other spring rod so that spring rods are interchangeable.
References Cited (Backward Citations)
US3451695A
Cited
US3527485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |