US3767075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bucket loader
Assignee: Manitou Equipment America LLC
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Filing: 1971-11-22
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Granted: 1973-10-23
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Expires: 1991-11-22
Abstract
Abstract A mobile loader having a vertically positionable bucket which can be used in earth working operations and the like and which can lift, transport, and dump a load as well as scrap the earth for levelling thereof. The loader has a hydraulically operated, parallel linkage arrangement for maintaining the bucket level regardless of its vertical position. The mounting linkage for the bucket is also such that the bucket can be moved to a completely dumping position for good clean-out of the bucket, it can be maintained in a level position regardless of its vertical position while at the same time the linkage and its associated hydraulic system permit the bucket to be moved to a lower, scraping position in which it is generally curled inwardly to provide good scraping action. The above described loader also has a quick attachment means for attaching the bucket to the linkage mechanism and by means of which the operator can simply drive the vehicle up to the rear side of the bucket and then manipulate the linkage to attach the bucket.
Inventors
- 👤 J Leverenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:12
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/3604; E02F3/3609; E02F3/3631; Y; Y10; Y10S; Y10S414/00; Y10S414/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
385 words
A self-propelled end loader vehicle having a frame, and also having a power source, a fluid pump driven by said power source, and ground engaging means for supporting and propelling said frame, an earth engaging bucket having upper and lower attaching brackets, a parallel linkage assembly for connecting said bucket to said frame for vertically positioning and tilting said bucket, said linkage assembly comprising, lift arms having an arm portion pivotally connected at one end to said frame and having a generally donwwardly extending portion at the other end, an actuating member pivotally connected to said lift arms intermediate the length thereof, double acting fluid tilt cylinder means arranged in general parallelism with said arm portion and pivotally connected at one end to said frame and at the other end to said actuating member for swinging the latter, link means pivotally connected at one end to said actuating means; said double acting fluid tilt cylinder means being longer than said link means, quick attachment means pivotally connected to said link means and to said lift arm downwardly extending portions, said quick attachment means also pivotally attached to said bucket brackets, said upper attaching bucket brackets having an open slot connection with said quick attachment means, and lift cylinder means connected between said vehicle frame and said parallel link assembly for vertically positioning the latter; a fluid control circuit including said tilt cylinder means and said lift cylinder means, said tilt cylinder means including a pair of cylinder and piston units, first conduit means connecting the rod end of said cylinders in fluid communication with one another, second conduit means connecting the head end of said cylinders in fluid communication with one another, a control valve between said first conduit means and said second conduit means for causing selective pressurization of said rod ends and head ends of said cylinders to cause actuation of said tilt cylinder means to thereby tilt said bucket through said actuating member and said link means, and a fluid pressure relief valve in said control circuit and in communication with said second circuit means for dumping fluid pressure from the head end of said tilt cylinder means over a predetermined maximum when said bucket is tilted to a predetermined position by said tilt cylinder means and said bucket is being raised.
Claim 2
Dependent Claim
385 words
A self-propelled end loader vehicle having a frame, and also having a power source, a fluid pump driven by said power source, and ground engaging means for supporting and propelling said frame, an earth engaging bucket having upper and lower attaching brackets, a parallel linkage assembly for connecting said bucket to said frame for vertically positioning and tilting said bucket, said linkage assembly comprising, lift arms having an arm portion pivotally connected at one end to said frame and having a generally donwwardly extending portion at the other end, an actuating member pivotally connected to said lift arms intermediate the length thereof, double acting fluid tilt cylinder means arranged in general parallelism with said arm portion and pivotally connected at one end to said frame and at the other end to said actuating member for swinging the latter, link means pivotally connected at one end to said actuating means; said double acting fluid tilt cylinder means being longer than said link means, quick attachment means pivotally connected to said link means and to said lift arm downwardly extending portions, said quick attachment means also pivotally attached to said bucket brackets, said upper attaching bucket brackets having an open slot connection with said quick attachment means, and lift cylinder means connected between said vehicle frame and said parallel link assembly for vertically positioning the latter; a fluid control circuit including said tilt cylinder means and said lift cylinder means, said tilt cylinder means including a pair of cylinder and piston units, first conduit means connecting the rod end of said cylinders in fluid communication with one another, second conduit means connecting the head end of said cylinders in fluid communication with one another, a control valve between said first conduit means and said second conduit means for causing selective pressurization of said rod ends and head ends of said cylinders to cause actuation of said tilt cylinder means to thereby tilt said bucket through said actuating member and said link means, and a fluid pressure relief valve in said control circuit and in communication with said second circuit means for dumping fluid pressure from the head end of said tilt cylinder means over a predetermined maximum when said bucket is tilted to a predetermined position by said tilt cylinder means and said bucket is being raised.
Claim 3
Dependent Claim
50 words
The loader vehicle set forth in claim 1 further characterized in that said open slot connection compriSes generally downwardly facing open ended slots in said upper bucket brackets, and said quick attachment means has bushings for insertion in said slots for pivotal mounting of said attachment means in said slots.
References Cited (Backward Citations)
US3275163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |