US3901341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traction mechanism
Assignee: Caterpillar Global Mining LLC
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Filing: 1973-07-09
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Granted: 1975-08-26
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Expires: 1993-07-09
Abstract
Abstract A walking dragline excavator has, for a propel system, a center base with movable feet on either side that are translated horizontally in the direction of travel, lowered to the ground and utilized to support the excavator which is then hoisted and translated to its next location over the feet and lowered again onto its base. The traction system for moving the feet and propelling the excavator includes a combination of a radial disc cam and crank on each side of the excavator that engage a pair of rollers and a slot respectively in a pedestal on each foot.
Inventors
- 👤 Erwin F Stoldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:32
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/02; E02F9/04; B; B62; B62D; B62D57/00; B66; B66C; B66C9/00; B66C9/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
In a walking mechanism for a mobile machine, such as an excavator, having: i. a base for stAtionary support of the machine; ii. a shoe for supporting said machine when said base is lifted and horizontally translated to transport said machine from one location to another; and 2 iii. a rotary walking shaft extending from said base for lifting and horizontally translating said base and said shoe relative to one another through a cycle of motion having both vertical and horizontal components; the improvement therein comprising: a. a rotary cam on said walking shaft for rotation therewith that has a non-circular cam surface which is orbited about said walking shaft; b. a frame on said shoe with a lengthwise slot; c. a crank pin rotated with said rotary cam about said walking shaft with the distance between the crank pin and walking shaft centers forming a crank arm, said crank pin engaging said slot for imparting one of said components of motion upon rotation of said walking shaft; and d. follower roller means carried by said shoe to engage said rotary cam and impart said other of said components of motion upon rotation of said walking shaft.
Claim 2
Dependent Claim
197 words
In a walking mechanism for a mobile machine, such as an excavator, having: i. a base for stAtionary support of the machine; ii. a shoe for supporting said machine when said base is lifted and horizontally translated to transport said machine from one location to another; and 2 iii. a rotary walking shaft extending from said base for lifting and horizontally translating said base and said shoe relative to one another through a cycle of motion having both vertical and horizontal components; the improvement therein comprising: a. a rotary cam on said walking shaft for rotation therewith that has a non-circular cam surface which is orbited about said walking shaft; b. a frame on said shoe with a lengthwise slot; c. a crank pin rotated with said rotary cam about said walking shaft with the distance between the crank pin and walking shaft centers forming a crank arm, said crank pin engaging said slot for imparting one of said components of motion upon rotation of said walking shaft; and d. follower roller means carried by said shoe to engage said rotary cam and impart said other of said components of motion upon rotation of said walking shaft.
Claim 3
Dependent Claim
63 words
A walking mechanism as in claim 1 in which said follower roller means comprises a pair of rollers located at circumferentially spaced points along said rotary cam, one of said rollers bearing a load for shoe movement during a portion of said cycle of motion, and said other roller bearing a load for base movement during another portion of said cycle of motion.
Claim 4
Dependent Claim
17 words
A walking mechanism as in claim 1 in which said slot of said frame is substantially vertical.
Claim 5
Dependent Claim
67 words
A walking mechanism as in claim 3 in which said follower roller means comprises a pair of rollers located at circumferentially spaced points along said rotary cam, with one roller located above said slot and the other roller located beneath said slot; and said walking shaft, said crank pin, and said rollers are in alignment with one another upon maximum vertical displacement of said base and shoe.
Claim 6
Dependent Claim
92 words
A walking mechanism as in claim 3 in which said follower roller means comprises a pair of rollers located in circumferentially spaced points along said rotary cam, with one of said rollers being below a portion of said rotary cam to sustain the load of said base during a part of the cycle of motion when said base is raised and the other roller being above a portion of said rotary cam to sustain the load of said shoe during another part of the cycle of motion when said shoe is raised.
References Cited (Backward Citations)
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |