US4558758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prime mover
Assignee: LITTMAN ERWIN
•
Filing: 1983-12-02
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Granted: 1985-12-17
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Expires: 2003-12-02
Abstract
Abstract A prime mover having a central body with a plurality of elongated legs pivotally connected to said central body for movement both up and down and sideways and individual steerable drive means on each elongated leg to enable the prime mover to move over a wide variety of terrains. The drive means include ground supporting wheels or tracks. Carried on the prime mover are electro hydraulic control means for steering each of the drive means and electric control means for actuating each of the drive means for moving the prime mover along the ground. A work platform is supported on the central body, which is appropriately levelled and stabilized in work position by proper extension or retraction or vertical depression or elevation of the respective elongated legs. The prime mover has four independently mounted drive means or wheels, unconnected by common axles or mechanical linkage and having no fixed track, that are controlled in such a manner that the geometry of steering produces a coherent effect.
Inventors
- 👤 Erwin J. Littman
- 👤 Glen L. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:51
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/02; B62D7/026; B62D57/00; B66; B66F; B66F11/00; B66F11/04; B66F11/044; B66F11/046
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
140 words
A prime mover comprising a central housing, a plurality of elongated legs, mounting means for mounting said legs on said central housing so as to permit movement of the legs both up and down and sideways relative to the central housing, drive means on each of said legs, control means for independently actuating each of said drive means for moving the central housing, said legs being adapted to be positioned so as to stabilize the orientation of the central housing, said mounting means including first pivot means for enabling movement of the legs up and down relative to the central housing and second pivot means for enabling movement of the legs sidewise relative to the central housing, and third pivot means on said legs for enabling movement of the drive means inwardly and outwardly with respect to the central housing.
Claim 2
Dependent Claim
140 words
A prime mover comprising a central housing, a plurality of elongated legs, mounting means for mounting said legs on said central housing so as to permit movement of the legs both up and down and sideways relative to the central housing, drive means on each of said legs, control means for independently actuating each of said drive means for moving the central housing, said legs being adapted to be positioned so as to stabilize the orientation of the central housing, said mounting means including first pivot means for enabling movement of the legs up and down relative to the central housing and second pivot means for enabling movement of the legs sidewise relative to the central housing, and third pivot means on said legs for enabling movement of the drive means inwardly and outwardly with respect to the central housing.
Claim 3
Dependent Claim
19 words
A prime mover as in claim 1 wherein each elongated leg is comprised of a plurality of articulated sections.
Claim 4
Dependent Claim
37 words
A prime mover as in claim 1 wherein each elongated leg is comprised of a plurality of sections, said third pivot means connecting adjacent sections, and actuating means for moving the adjacent sections relative to one another.
Claim 5
Dependent Claim
18 words
A prime mover as in claim 3 wherein the actuating means comprise cylinder means connected to adjacent sections.
Claim 6
Dependent Claim
23 words
A prime mover as in claim 1 including actuating means connected between the central housing and the legs for moving the legs sidewise.
Claim 7
Dependent Claim
15 words
A prime mover as in claim 5 including four legs secured to said central housing.
Claim 8
Dependent Claim
67 words
A prime mover as in claim 1 wherein said drive means includes a king pin journaled to a section of each leg, frame means secured to the stub shaft for rotation therewith, ground support means rotatably supported on the frame means, and rotating means operatively connected to said ground support means for rotating same, whereby the frame means are positioned to properly orient the ground support means.
Claim 9
Dependent Claim
30 words
A prime mover as in claim 1 including power means on said central housing and means connecting said power means to said drive means on each leg for actuating same.
Claim 10
Dependent Claim
26 words
A prime mover as in claim 1 including a pair of telescoping sections in at least one of said legs for adjusting the effective length thereof.
Claim 11
Dependent Claim
19 words
A prime mover as in claim 9 including actuating means for moving the telescoping sections relative to one another.
Claim 12
Dependent Claim
21 words
A prime mover as in claim 1 wherein the control means includes switch means for selecting modes of prime mover operation.
Claim 13
Dependent Claim
34 words
A prime mover as in claim 11 including a synchro associated with the second pivot means for providing an electrical signal in response to the displacement of the leg about the second pivot means.
Claim 14
Dependent Claim
26 words
A prime mover as in claim 11 including means for rotatably supporting the drive means for rotation about a driving axis and about a steering axis.
Claim 15
Dependent Claim
37 words
A prime mover as in claim 13 including a synchro associated with the means for rotatably supporting the drive means for providing an electrical signal in response to rotation of the drive means about the steering axis.
Claim 16
Dependent Claim
21 words
A prime mover as in claim 13 including a hydraulic rotary actuator for rotating the drive means about the steering axis.
Claim 17
Dependent Claim
27 words
A prime mover as in claim 12 including a bracket supporting the synchro and clamp means for enabling rotatable adjustment of the synchro relative to the bracket.
Claim 18
Dependent Claim
27 words
A prime mover as in claim 14 including a bracket supporting the synchro and clamp means for enabling rotatable adjustment of the synchro relative to the bracket.
Claim 19
Dependent Claim
102 words
A prime mover as in claim 1 including fourth pivot means on the legs connected to the drive means for pivoting the drive means about a generally vertical axis when the elongated legs are extended, said drive means including rotatable ground support means, electric motor means for rotating the ground support means, said control means including first control means controlling the pivoting of the drive means about said generally vertical axis for controlling the steering of the prime mover and second control means for controlling the electric motor means to control rotation of the ground support means in the selected steering operation.
Claim 20
Dependent Claim
217 words
A prime mover comprising a central housing, a plurality of elongated legs, mounting means for mounting said legs on said central housing so as to permit movement of the legs both up and down and sideways relative to the central housing, drive means secured on each of said legs, control means for independently actuating each of said drive means for moving the central housing, the mounting means including first pivot means for enabling movement of the legs up and down relative to the central housing and second pivot means for enabling movement of the legs sidewise relative to the central housing, and third pivot means on the legs for enabling a portion thereof carrying the drive means to be moved inwardly and outwardly with respect to the central housing, first actuating means for moving the legs up and down, second actuating means for moving the legs sideways, third actuating means for moving said portion inwardly and outwardly with respect to the central housing, said legs being adapted to be positioned so as to stabilize the orientation of the central housing, said legs being adapted to be positioned so as to stabilize the orientation of the central housing on a variety of surfaces and said drive means operable to move the prime mover over a variety of surfaces.
Claim 21
Dependent Claim
217 words
A prime mover comprising a central housing, a plurality of elongated legs, mounting means for mounting said legs on said central housing so as to permit movement of the legs both up and down and sideways relative to the central housing, drive means secured on each of said legs, control means for independently actuating each of said drive means for moving the central housing, the mounting means including first pivot means for enabling movement of the legs up and down relative to the central housing and second pivot means for enabling movement of the legs sidewise relative to the central housing, and third pivot means on the legs for enabling a portion thereof carrying the drive means to be moved inwardly and outwardly with respect to the central housing, first actuating means for moving the legs up and down, second actuating means for moving the legs sideways, third actuating means for moving said portion inwardly and outwardly with respect to the central housing, said legs being adapted to be positioned so as to stabilize the orientation of the central housing, said legs being adapted to be positioned so as to stabilize the orientation of the central housing on a variety of surfaces and said drive means operable to move the prime mover over a variety of surfaces.
References Cited (Backward Citations)
US3306390A
Cited
US3664448A
Cited
US3792745A
Cited
US3900077A
Cited
US4096766A
Cited
US4076131A
Cited
US4029165A
Cited
SU742232A1
Cited
US4241803A
Cited
US4265326A
Cited
DE2915070A1
Cited
US4395191A
Cited
US4360077A
Cited
US4502556A
Cited
US4503924A
Cited
US4511011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |