Patent US4145073A successfully refreshed from Google Patents.
US4145073A
Expired / Lapsed
US
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Lockup system for a vehicle suspension mechanism
Assignee: Caterpillar Inc
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Filing: 1977-04-07
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Granted: 1979-03-20
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Expires: 1997-04-07
Abstract
Abstract A lockup system for a vehicle suspension mechanism includes a frame, an axle assembly having a ground engaging wheel thereon, a radius arm pivotally connected to the frame and supporting the axle assembly and wheel, a resilient suspension device connected to the frame and one of the arm and axle assembly for cushioning oscillatory movement of the arm as the wheel traverses irregular terrain, and a lockup apparatus connected to the frame and to one of the arm and axle assembly independently of the resilient suspension device and being of a construction sufficient for maintaining a preselected length holding the arm substantially rigid or maintaining a freely telescoping length floating the arm and permitting full action of the resilient suspension device.
Inventors
- 👤 Walter L. McLuckie
- 👤 Herschel M. Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:01
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
In a lockup system for a vehicle suspension mechanism of the type having a frame; an axle assembly having a ground engaging wheel thereon; a radius arm pivotally connected to the frame and supporting the axle assembly and wheel; and resilient suspension means connected to the frame and one of the arm and axle assembly for cushioning oscillatory movement of the arm as the wheel traverses irregular terrain; the improvement comprising: a lockup suspension strut having first and second reciprocally connected members defining first and second chambers therebetween, said first and second members connected individually to one of the frame and the axle assembly; and control means having a first condition for communicating a fluid to and from said chambers for telescoping said first and second members simultaneously with the independent cushioning action of said resilient suspension means, and having a second condition for blocking fluid communication to said chambers and maintaining a substantially rigid holding position of the frame and the arm.
Claim 2
Dependent Claim
163 words
In a lockup system for a vehicle suspension mechanism of the type having a frame; an axle assembly having a ground engaging wheel thereon; a radius arm pivotally connected to the frame and supporting the axle assembly and wheel; and resilient suspension means connected to the frame and one of the arm and axle assembly for cushioning oscillatory movement of the arm as the wheel traverses irregular terrain; the improvement comprising: a lockup suspension strut having first and second reciprocally connected members defining first and second chambers therebetween, said first and second members connected individually to one of the frame and the axle assembly; and control means having a first condition for communicating a fluid to and from said chambers for telescoping said first and second members simultaneously with the independent cushioning action of said resilient suspension means, and having a second condition for blocking fluid communication to said chambers and maintaining a substantially rigid holding position of the frame and the arm.
Claim 3
Dependent Claim
44 words
The lockup system of claim 1 wherein said control means includes a pair of conduits communicating with said first and second chambers, and valve means for freely transferring a fluid therebetween in said first condition and for blocking said conduits in said second condition.
Claim 4
Dependent Claim
42 words
The lockup system of claim 2 wherein said control means includes source of fluid and a conduit communicating said source of fluid to said valve means, said source of fluid being disposed elevationally above said valve means and said lockup suspension strut.
Claim 5
Dependent Claim
54 words
The lockup system of claim 1 wherein said control means includes a pair of conduits communicating with said first and second chambers, a source of fluid, a two position selector valve connected to said pair of conduits and to said source, and means for selectively positioning said valve at said first and second positions.
Claim 6
Dependent Claim
32 words
The lockup system of claim 4 wherein said valve at said first position communicates fluid freely between said source and said pair of conduits, and at said second position blocks said conduits.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |