US4017094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steering converter apparatus
Assignee: Individual
•
Filing: 1975-10-16
•
Granted: 1977-04-12
•
Expires: 1995-10-16
Abstract
Abstract The total apparatus for transporting long loads includes a tractor, a first steering converter trailer truck, and a second load-bearing trailer truck. Forward and aft bolsters are mounted on the tractor and the second truck for rotation about vertical axes to support the load and be tied to it. The first truck has a steering converter coupler with a terminal at its forward end engaged with a pivotal connector on the tractor located well aft of the bolster pivot. The second truck has a follower coupler with its forward end pivotally connected to the first truck, which does not contact the load and is free to move to either side. Lateral movement of the pivotal connector when the tractor turns directs the first truck to the outside of the curve away from the centerline of the load and the second truck follows it. The outboard position of the first truck counteracts any tipping tendency on a fast turn. Both trucks tend to follow closely in the path of the tractor, which avoids "corner cutting" and enables the tractor to negotiate turns of much smaller radius than would otherwise be possible.
Inventors
- 👤 Robert Dwayne Pilcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:24
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
Apparatus for transporting long loads comprising: a tractor having a body, rear driving wheels, and forward steerable wheels, a first steering converter trailer truck provided with road wheels, and a second load-bearing trailer truck provided with road wheels; a forward bolster mounted on the tractor body for rotation about a vertical axis and constructed and arranged to support and be secured to the forward portion of a long load; the second truck being located well aft of the tractor and provided with an aft bolster mounted thereon for rotation about a vertical axis and constructed and arranged to support and be secured to the aft portion of a long load;
Claim 2
Dependent Claim
110 words
Apparatus for transporting long loads comprising: a tractor having a body, rear driving wheels, and forward steerable wheels, a first steering converter trailer truck provided with road wheels, and a second load-bearing trailer truck provided with road wheels; a forward bolster mounted on the tractor body for rotation about a vertical axis and constructed and arranged to support and be secured to the forward portion of a long load; the second truck being located well aft of the tractor and provided with an aft bolster mounted thereon for rotation about a vertical axis and constructed and arranged to support and be secured to the aft portion of a long load;
Claim 3
Dependent Claim
210 words
the tractor and the second truck serving to take the entire weight of the load with the latter serving as the draft hitch between the tractor and the second truck; the first steering converter truck being located at an intermediate position between the tractor and the second truck independently of the load and of the aft bolster, and bearing no part of the weight thereof; a pivot mount on the first truck; an elongate follower coupler secured to the second truck in non-load-bearing position independently of the aft bolster and extending forward from the second truck with its forward end connected to the pivot mount for rotation; a pivotal connector secured to a fixed part of the tractor body independent of the bolster and at a point spaced aft of the pivotal axis of the bolster; and a steering converter coupler secured to the first truck and extending forward therefrom with its forward end pivotally connected to the connector on the tractor; the first truck being free to swing laterally independently of the load and adapted to be directed by the lateral movement of the pivotal connector, in response to turning movement of the tractor, toward the outside of the curve to increase the turning radius of the first truck.
Claim 4
Dependent Claim
210 words
the tractor and the second truck serving to take the entire weight of the load with the latter serving as the draft hitch between the tractor and the second truck; the first steering converter truck being located at an intermediate position between the tractor and the second truck independently of the load and of the aft bolster, and bearing no part of the weight thereof; a pivot mount on the first truck; an elongate follower coupler secured to the second truck in non-load-bearing position independently of the aft bolster and extending forward from the second truck with its forward end connected to the pivot mount for rotation; a pivotal connector secured to a fixed part of the tractor body independent of the bolster and at a point spaced aft of the pivotal axis of the bolster; and a steering converter coupler secured to the first truck and extending forward therefrom with its forward end pivotally connected to the connector on the tractor; the first truck being free to swing laterally independently of the load and adapted to be directed by the lateral movement of the pivotal connector, in response to turning movement of the tractor, toward the outside of the curve to increase the turning radius of the first truck.
Claim 5
Dependent Claim
44 words
Apparatus as claimed in claim 1; in which the effective length of at least one of the couplers is freely variable within predetermined limits during transport to provide a predetermined extent of departure of the first truck from the longitudinal centerline of the load.
Claim 6
Dependent Claim
31 words
Apparatus as claimed in claim 2; in which the effective length of the steering converter coupler is variable during transport and the length of the follower coupler is fixed during transport.
Claim 7
Dependent Claim
27 words
Apparatus as claimed in claim 3; in which the follower coupler is adjustable in length when the apparatus is stationary, and is lockable at any selected length.
Claim 8
Dependent Claim
38 words
Apparatus as claimed in claim 4; in which the second truck is provided with a longitudinally extending socket; the follower coupler includes an elongate shank slidable in the socket; and locking means engages the socket and the shank.
Claim 9
Dependent Claim
51 words
Apparatus as claimed in claim 1; in which the steering converter coupler includes a first elongate shank fixedly secured to the first truck and a second elongate shank longitudinally slidably connected to the first shank and having a terminal at its forward end to engage the pivotal connector on the tractor.
Claim 10
Dependent Claim
28 words
Apparatus as claimed in claim 6; in which the first elongate shank is a rigid tube and the second shank telescopes within the tube in sliding engagement therewith.
Claim 11
Dependent Claim
62 words
Apparatus as claimed in claim 6; in which the first shank is provided with a first fixed stop mounted on the forward portion thereof; and the second shank is provided with a second stop adjustable to selected longitudinal positions along its forward portion and engageable with the first stop to limit extension of the second shank with respect to the first shank.
Claim 12
Dependent Claim
32 words
Apparatus as claimed in claim 8; in which one of the stops is provided with a resilient bumper member to contact the other stop and cushion the shock of maximum extension movement.
Claim 13
Dependent Claim
34 words
Apparatus as claimed in claim 1; in which the first truck is provided with a single axle to facilitate relatively sharp turning in response to lateral movement of the pivotal connector on the tractor.
Claim 14
Dependent Claim
22 words
Apparatus as claimed in claim 10; in which the pivot mount on the first truck is located substantially directly above the axle.
Claim 15
Dependent Claim
34 words
Apparatus as claimed in claim 1; in which the second truck is provided with two longitudinally spaced tandem axles; and the vertical axis of rotation of the aft bolster is located between the axles.
Claim 16
Dependent Claim
60 words
Apparatus as claimed in claim 1; in which anchors are provided on the bolsters to receive tie-down members for securing the long load against longitudinal displacement with respect to either bolster and cause the towing force of the tractor to be transmitted through the load to the truck and thence through the follower coupler to push the first truck forward.
References Cited (Backward Citations)
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Cited
US2520776A
Cited
US3087744A
Cited
US3102735A
Cited
US3430987A
Cited
US3591200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |