US3828874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crawler undercarriage
Assignee: Gardner Denver Inc
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Filing: 1972-10-27
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Granted: 1974-08-13
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Expires: 1992-10-27
Abstract
Abstract A crawler undercarriage for a mobile rock drill unit or the like comprising spaced apart parallel crawler assemblies having crawler frames which are pivotally interconnected by a transverse axle located substantially midway the length of the crawler frames. A pair of transverse equalizer beams substantially equally spaced on each side of the transverse axle are pivotally connected to the crawler frames and to a main support platform for the rock drill unit by means of spherical self-aligning bearings.
Inventors
- 👤 M Council
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/025; B; B62; B62D; B62D55/00; B62D55/08; B62D55/084; B62D55/0842; E21B7/024
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
In a crawler undercarriage: a single pair of spaced apart parallel crawler frames adapted to movably support flexible endless tracks thereon; a transverse axle located substantially midway between opposite ends of said crawler frames and having opposite end portions pivotally connected to said crawler frames; a pair of equalizer beams spaced equidistant on opposite sides of said transverse axle and having their respective opposite end portions pivotally connected to said crawler frames by spherical bearing means; and frame means located between said spaced apart crawler frames and supported by said equalizer beams and said transverse axle.
Claim 2
Dependent Claim
96 words
In a crawler undercarriage: a single pair of spaced apart parallel crawler frames adapted to movably support flexible endless tracks thereon; a transverse axle located substantially midway between opposite ends of said crawler frames and having opposite end portions pivotally connected to said crawler frames; a pair of equalizer beams spaced equidistant on opposite sides of said transverse axle and having their respective opposite end portions pivotally connected to said crawler frames by spherical bearing means; and frame means located between said spaced apart crawler frames and supported by said equalizer beams and said transverse axle.
Claim 3
Dependent Claim
25 words
The invention set forth in claim 1 wherein: said equalizer beams include spherical bearing means for pivotally connecting said equalizer beams to said frame means.
Claim 4
Dependent Claim
56 words
The invention set forth in claim 1 wherein: said crawler frames include journal bearing means for supporting said opposite end portions of said transverse axle and said crawler frames are movable axially on said opposite end portions of said transverse axle in response to pivotal movement of said crawler frames with respect to said transverse axle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |