US3656776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-trailer
Assignee: Individual
•
Filing: 1969-11-28
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Granted: 1972-04-18
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Expires: 1989-11-28
Abstract
Abstract A semi-trailer which has at least one track alignment axle pivotally movable about the vertical central axis of said axle, which latter has associated therewith locking means operable positively to prevent said axle from pivoting about said axis when said semi-trailer is moving along a substantially straight path.
Inventors
- 👤 Helmut Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:04
CPC Classifications
B; B62; B62D; B62D13/00; B62D13/02; B62D13/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
A semi-trailer having at least one track alignment axle with means permitting a pivotal movement of said axle about the vertical central axis of said axle, which includes locking means operable positively to prevent said axle from pivoting about said axis when said semi-trailer is moving along a substantially straight path, said locking means including an upper turn-table ring having a locking plate secured directly thereon and a lower turn-table ring having a movable lever linked therewith as well as carrying a wedge piece also linked to said lever, fluid actuated cylinder means operative upon said lever engageable with said locking plate, supporting means of the semi-trailer for resting on a tractor, and control switch means at least in part arranged fixedly with two plate members on said supporting means of the semi-trailer and operatively connected to said locking means, said control switch means being operable upon engagement with one of said plate members in response to the longitudinal central axis of said semi-trailer forming with the longitudinal axis of a tractor therefor an angle exceeding a predetermined maximum angle to make said locking means ineffective.
Claim 2
Dependent Claim
186 words
A semi-trailer having at least one track alignment axle with means permitting a pivotal movement of said axle about the vertical central axis of said axle, which includes locking means operable positively to prevent said axle from pivoting about said axis when said semi-trailer is moving along a substantially straight path, said locking means including an upper turn-table ring having a locking plate secured directly thereon and a lower turn-table ring having a movable lever linked therewith as well as carrying a wedge piece also linked to said lever, fluid actuated cylinder means operative upon said lever engageable with said locking plate, supporting means of the semi-trailer for resting on a tractor, and control switch means at least in part arranged fixedly with two plate members on said supporting means of the semi-trailer and operatively connected to said locking means, said control switch means being operable upon engagement with one of said plate members in response to the longitudinal central axis of said semi-trailer forming with the longitudinal axis of a tractor therefor an angle exceeding a predetermined maximum angle to make said locking means ineffective.
Claim 3
Dependent Claim
51 words
A semi-trailer according to claim 1, in which said control switch means comprises a pressure switch mounted on a frame structure forming part of said semi-trailer, and two terminals formed by said plate members arranged in spaced relationship to each other and located laterally of said pressure switch for actuation thereby.
Claim 4
Dependent Claim
41 words
A semi-trailer according to claim 2, which includes manually operable means adapted operatively to be connected to the driver''s cab of a tractor for said semi-trailer, and operable independently of said control switch means for controlling said locking means whenever desired.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |