Patent US3862697A successfully refreshed from Google Patents.
US3862697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front loading hydraulic excavator
Assignee: Caterpillar Inc
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Filing: 1972-08-24
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Granted: 1975-01-28
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Expires: 1992-08-24
Abstract
Abstract There is disclosed a hydraulic excavator having linkage providing for a front loading arrangement whereby the bucket opens away from the vehicle. The linkage is arranged to maintain a substantially fixed preselected attitude of the bucket with respect to the boom upon movement of the stick about its pivotal connection to the boom. Further control means are provided to maintain a preselected attitude of the bucket with respect to a fixed plane upon movement of the boom.
Inventors
- 👤 Stephen H Gill
- 👤 Harvey A Knell
- 👤 Iii Joseph M Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:40
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/43; E02F3/435; E02F3/436; E02F3/30; E02F3/308; E02F3/425; Y; Y10; Y10S; Y10S414/00; Y10S414/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A hydraulic excavator, comprising: a vehicle having a mobile carriage and a rotary platform supported on said carriage; a boom pivotally supported at one end on said rotary platform for movement about a horizontal axis; a stick pivotally connected at one end to the outer end of said boom; a bucket pivotally connected to the other end of said stick; a hydraulic jack pivotally connected at one end to said boom inboard of said stick and at the other end to operate said bucket, said jack and said stick together with said boom and said bucket forming a four bar linkage; means including a master cylinder operatively connected to be operated by said boom, and means operatively communicating pressurized fluid from said master cylinder to said bucket jack in response to pivotal movement of said boom to maintain said bucket in a substantially constant preselected attitude.
Claim 2
Dependent Claim
146 words
A hydraulic excavator, comprising: a vehicle having a mobile carriage and a rotary platform supported on said carriage; a boom pivotally supported at one end on said rotary platform for movement about a horizontal axis; a stick pivotally connected at one end to the outer end of said boom; a bucket pivotally connected to the other end of said stick; a hydraulic jack pivotally connected at one end to said boom inboard of said stick and at the other end to operate said bucket, said jack and said stick together with said boom and said bucket forming a four bar linkage; means including a master cylinder operatively connected to be operated by said boom, and means operatively communicating pressurized fluid from said master cylinder to said bucket jack in response to pivotal movement of said boom to maintain said bucket in a substantially constant preselected attitude.
Claim 3
Dependent Claim
39 words
The excavator of claim 1 wherein the head end of said master cylinder communicates with the head end of said bucket jack; and, the rod end of said master cylinder communicates with the rod end of said bucket jack.
Claim 4
Dependent Claim
13 words
The excavator of claim 2 wherein said bucket opens away from said vehicle.
Claim 5
Dependent Claim
185 words
A bucket linkage and control system for an excavator vehicle having ground engaging translation means, comprising: a boom for pivotal connection at one end to a vehicle; a stick of approximately the same length as the boom pivotally connected at one end to the outer end of said boom; said boom and stick each having a length exceeding the distance of the boom pivotal connection above the ground engaging portion of said translation means; a bucket pivotally connected to the other end of said stick; a hydraulic jack for pivotal operation of each of said boom, stick, and bucket, said hydraulic jack for operation of said bucket, together with said stick, forming opposite sides of a four bar linkage and defining substantially a parallelogram when operated for level crowd; means responsive to movement of said boom comprising a master cylinder operatively connected to be operated by movement of said boom; and means operatively communicating pressurized fluid from said master cylinder to said bucket jack to operate same in response to pivotal movement of said boom to maintain said bucket in a substantially constant preselected attitude.
Claim 6
Dependent Claim
185 words
A bucket linkage and control system for an excavator vehicle having ground engaging translation means, comprising: a boom for pivotal connection at one end to a vehicle; a stick of approximately the same length as the boom pivotally connected at one end to the outer end of said boom; said boom and stick each having a length exceeding the distance of the boom pivotal connection above the ground engaging portion of said translation means; a bucket pivotally connected to the other end of said stick; a hydraulic jack for pivotal operation of each of said boom, stick, and bucket, said hydraulic jack for operation of said bucket, together with said stick, forming opposite sides of a four bar linkage and defining substantially a parallelogram when operated for level crowd; means responsive to movement of said boom comprising a master cylinder operatively connected to be operated by movement of said boom; and means operatively communicating pressurized fluid from said master cylinder to said bucket jack to operate same in response to pivotal movement of said boom to maintain said bucket in a substantially constant preselected attitude.
Claim 7
Dependent Claim
29 words
The invention of claim 4 wherein the connection of said bucket operating jack to said boom is spaced inboard from the connection of the stick to the end thereof.
Claim 8
Dependent Claim
20 words
The invention of claim 5 wherein said master cylinder and said bucket operating jack are in head to head communication.
Claim 9
Dependent Claim
13 words
The invention of claim 6 wherein said bucket opens away from said vehicle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |