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US3786953A Expired / Lapsed US ⏱️ 0.0 years remaining

Loader linkage

Assignee: Fiat Allis Europe SpA
•
Filing: 1972-11-16
•
Granted: 1974-01-22
•
Expires: 1992-11-16
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Abstract

Abstract The bucket control linkage of a tractor loader includes a vertically disposed lever pivotally connected intermediate its upper and lower ends to a boom. A dump link is interconnected between the lower end of the lever and the upper rear of the bucket. The bucket control linkage also includes a bucket operating jack having its front rod end pivotally connected to the upper end of the lever and its rear cylinder end pivotally connected to a special linkage. The special linkage includes a pair of pivotally interconnected links, one of which is pivotally connected to the boom and the other of which is pivotally connected to the tractor frame at a point spaced forwardly of the pivot connection between the boom and the frame. The special linkage to which the cylinder end of the bucket operating jack is connected, causes the bucket to automatically retract as the boom is raised through an initial angle toward its level position and then will cause the bucket to pivot forwardly relative to the boom to maintain the bucket in a proper material retaining altitude in relation to the ground. The various components of the bucket operating linkage are in line with the longitudinal vertical plane of the boom for ideal component stress distribution. The bucket is retracted by introduction of hydraulic fluid to the cylinder end of the dumping jack whereby the greatest possible breakout force is achieved by the jack. The rod end of the hydraulic jack is pressurized to dump the bucket thus giving the shortest possible dumping time. The connections between the bucket operating linkage and the frame of the tractor are relatively low thereby affording good operator visibility and desirable loader frame stress distribution.

Inventors

  • 👤 R Crum
  • 👤 I Patel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 22:57
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/34; E02F3/3405; E02F3/3411

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 262 words
In a tractor loader having a frame, the combination comprising: a longitudinally extending boom pivotally connected to said frame on a first transverse axis, a bucket pivotally connected at its lower rear portion to the front end of said boom on a second transverse axis, a lift jack operatively interposed between said frame and said boom, a lever structure pivotally connected intermediate its upper and lower ends to an intermediate part of said boom on a third transverse axis, a dump link structure pivotally connected at one of its opposite ends to the upper rear portion of said bucket and pivotally connected at the other of its opposite ends to said lower end of said lever structure, an expansible and contractible strut pivotally connected at one of its opposite ends to said upper end of said lever structure, and linkage means interconnecting said strut, frame and boom including a first link pivotally connected at one of its opposite ends to said boom on a fourth transverse axis disposed forwardly of said first transverse axis, a second link pivotally connected at one of its opposite ends to said frame on a fifth transverse axis disposed forwardly of said first transverse axis, first pivot means pivotally interconnecting said first and second links on a transverse axis spaced from said fourth and fifth axes, and second pivot means pivotally connecting the other end of said strut to one of said first and second links on a transverse axis spaced from said fourth and fifth axes whereby said strut is in overlying relation to said boom.
Claim 2
Dependent Claim 262 words
In a tractor loader having a frame, the combination comprising: a longitudinally extending boom pivotally connected to said frame on a first transverse axis, a bucket pivotally connected at its lower rear portion to the front end of said boom on a second transverse axis, a lift jack operatively interposed between said frame and said boom, a lever structure pivotally connected intermediate its upper and lower ends to an intermediate part of said boom on a third transverse axis, a dump link structure pivotally connected at one of its opposite ends to the upper rear portion of said bucket and pivotally connected at the other of its opposite ends to said lower end of said lever structure, an expansible and contractible strut pivotally connected at one of its opposite ends to said upper end of said lever structure, and linkage means interconnecting said strut, frame and boom including a first link pivotally connected at one of its opposite ends to said boom on a fourth transverse axis disposed forwardly of said first transverse axis, a second link pivotally connected at one of its opposite ends to said frame on a fifth transverse axis disposed forwardly of said first transverse axis, first pivot means pivotally interconnecting said first and second links on a transverse axis spaced from said fourth and fifth axes, and second pivot means pivotally connecting the other end of said strut to one of said first and second links on a transverse axis spaced from said fourth and fifth axes whereby said strut is in overlying relation to said boom.
Claim 3
Dependent Claim 33 words
The invention of claim 1 wherein the transverse axis interconnecting said first and second links is the same transverse axis on which said strut and said one of said links are pivotally connected.
Claim 4
Dependent Claim 17 words
The invention of claim 2 wherein said first and second pivot means comprise a transverse pivot pin.
Claim 5
Dependent Claim 17 words
The invention of claim 1 wherein said fifth pivot axis is spaced above said first pivot axis.
Claim 6
Dependent Claim 33 words
The invention of claim 4 wherein the transverse axis interconnecting said first and second links is the same transverse axis on which said strut and said one of said links are pivotally connected.
Claim 7
Dependent Claim 17 words
The invention of claim 1 wherein said strut lies in the longitudinal vertical plane of said boom.
Claim 8
Dependent Claim 55 words
The invEntion of claim 6 wherein said lever structure includes levers on transversely opposite sides of said boom pivotally connected to the latter on said third axis and wherein said dump link structure includes dump links on transversely opposite sides of said boom having their corresponding opposite ends pivotally connected to said bucket and levers.
Claim 9
Dependent Claim 89 words
The invention of claim 6 wherein said linkage means includes a pair of first links on opposite transverse sides of said boom pivotally connected to said boom on said fourth axis, a pair of second links disposed on the transversely outer sides of said first links and pivotally connected to said frame on said fifth axis, said first pivot means pivotally interconnects said pairs of links, and said second pivot means pivotally connects the other end of said strut to one of said pairs of first and second links.
Claim 10
Dependent Claim 17 words
The invention of claim 8 wherein said first and second pivot means comprise a transverse pivot pin.
Claim 11
Dependent Claim 48 words
The invention of claim 1 wherein said strut includes a double acting hydraulic jack having its rod end pivotally connected to said upper end of said lever structure and having its cylinder end pivotally connected by said second pivot means to one of said first and second links.

References Cited (Backward Citations)

US3211310A Cited
US3464574A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-01-21 1977-07-23 1978-01-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-01-21 1981-07-23 1982-01-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-01-21 1985-07-23 1986-01-22 $7700.00 Window Closed / Lapsed

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