US3929204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer crane with outrigger to crawler conversion
Assignee: Individual
•
Filing: 1975-01-22
•
Granted: 1975-12-30
•
Expires: 1995-01-22
Abstract
Abstract Conventionally, a trailer carrying a crane thereon is pulled by a tractor to the site where the crane is to be employed, reliance thereafter still being made on the tractor in order to move the crane from one vantage point to another. Provision is herein made for substituting hydraulically powered crawlers for the usual outrigger jacks, thereby enabling the trailer to be uncoupled from the tractor and more readily maneuvered into the various vantage positions in order to perform a given task.
Inventors
- 👤 Lawrence Hugh Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:45
CPC Classifications
B; B62; B62D; B62D63/00; B62D63/06; B60; B60P; B60P3/00; B60P3/28; B62D55/00; B62D55/06; B62D55/062
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
165 words
A trailer crane comprising an elongated chassis having forward and rear ends, coupling means at the forward end of the chassis for connecting said forward end to a tractor, wheel means near the rear end of the chassis for supporting said rear end so that said chassis can be pulled by a tractor, a crane carried on said chassis, first and second longitudinally spaced means at one side of said chassis for mounting a first pair of stabilizers, third and fourth longitudinally spaced means at the other side of said chassis for mounting a second pair of stabilizers, first and second crawlers each including a frame and an endless track, means for detachably mounting said first crawler to said first and second longitudinally spaced means, and means for detachably mounting said second crawler to said third and fourth longitudinally spaced means, whereby said crawlers can be employed in lieu of stabilizers to independently maneuver said trailer when said forward end is uncoupled from said tractor.
Claim 2
Dependent Claim
165 words
A trailer crane comprising an elongated chassis having forward and rear ends, coupling means at the forward end of the chassis for connecting said forward end to a tractor, wheel means near the rear end of the chassis for supporting said rear end so that said chassis can be pulled by a tractor, a crane carried on said chassis, first and second longitudinally spaced means at one side of said chassis for mounting a first pair of stabilizers, third and fourth longitudinally spaced means at the other side of said chassis for mounting a second pair of stabilizers, first and second crawlers each including a frame and an endless track, means for detachably mounting said first crawler to said first and second longitudinally spaced means, and means for detachably mounting said second crawler to said third and fourth longitudinally spaced means, whereby said crawlers can be employed in lieu of stabilizers to independently maneuver said trailer when said forward end is uncoupled from said tractor.
Claim 3
Dependent Claim
44 words
The combination of claim 1 in which said first and second and said third and fourth longitudinally spaced means each includes a laterally extending beam, and said respective detachable mounting means each includes a pair of members engageable with a pair of said beams.
Claim 4
Dependent Claim
17 words
The combination of claim 2 in which each of said pairs of members constitutes a box frame.
Claim 5
Dependent Claim
26 words
The combination of claim 3 in which each stabilizer also has a box frame, said crawler box frames corresponding in size to said stabilizer box frames.
Claim 6
Dependent Claim
35 words
The combination of claim 4 in which said beams have a rectangular cross section and said stabilizer and crawler box frames have a cross section corresponding to that of the projecting ends of said beams.
Claim 7
Dependent Claim
29 words
The combination of claim 5 in which each beam has a plurality of pin-receiving holes and said stabilizer and crawler box frames have a corresponding number of pin-receiving holes.
Claim 8
Dependent Claim
31 words
The combination of claim 6 in which said crawler box frames are fixedly secured to the frames of said crawlers and have a loNgitudinal spacing corresponding to that of said beams.
Claim 9
Dependent Claim
45 words
The combination of claim 7 including an adapter for each crawler, each adapter having a first pair of longitudinally spaced box frames engageable with the projecting ends of said beams and a second pair of longitudinally spaced box frames engageable with said crawler box frames.
Claim 10
Dependent Claim
67 words
The combination of claim 8 in which the longitudinal spacing of said beams at each side of said chassis is different from the longitudinal spacing of said crawler box frames, said first pair of adaptor box frames having a longitudinal spacing corresponding to that of said beams and said second pair of adapter box frames having a longitudinal spacing corresponding to that of said crawler box frames.
Claim 11
Dependent Claim
46 words
The combination of claim 1 in which each stabilizer includes a hydraulic jack and each crawler includes a pair of hydraulic motors, and hydraulic circuitry for said jacks, said hydraulic circuitry supplying fluid under pressure to said motors when said crawlers are substituted for said jacks.
Claim 12
Dependent Claim
14 words
The combination of claim 1 including a pair of lifting bails on each crawler.
Claim 13
Dependent Claim
12 words
The combination of claim 11 including a lifting bail on each stabilizer.
References Cited (Backward Citations)
US2057211A
Cited
US3382943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |