US3568869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antirollback mechanism
Assignee: Case LLC
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Filing: 1969-01-09
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Granted: 1971-03-09
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Expires: 1989-01-09
Abstract
Abstract A loader unit mounted on a tractor and including pivotally mounted lift arms on which there is pivotally supported a bucket controlled by a hydraulic circuit including a bucket control cylinder. The loader unit includes an antirollback mechanism incorporating a control member and a control link. The control member is moved relative to the link in response to movement of the bucket control operating lever; and the control link is movable relative to the control member by raising and lowering of the lift arms and pivoting of the bucket relative to the lift arms so that the link engages the control member to prevent rollback of the bucket when the bucket and the arms are in position to permit rearward dumping of the bucket.
Inventors
- 👤 Gary L Beiley
- 👤 Gary A Dickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:52
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
435 words
A material-handling device comprising in combination a support structure, lift arm means pivotally connected to said support structure, a bucket, means for pivotally supporting said bucket on said lift arm means, means for raising and lowering said lift arm means, a bucket operating system including bucket control linkage connected between said bucket and said lift arm means, a hydraulic circuit comprised of a bucket control cylinder connected between said bucket control linkage and said lift arm means and a bucket control valve, a bucket operating lever, a bucket operating linkage connecting said operating lever, to said bucket control valve for operating said valve and cylinder in response to movement of said bucket operating lever, whereby movement of said bucket operating lever into a first position rolls said bucket back relative to said lift arm means and movement of said bucket operating lever into a second position rolls said bucket forward relative to said lift arm means, a bucket antirollback control member having an arcuate control surface, means for pivotally mounting said bucket antirollback control member on said support structure, a bucket antirollback control rod, means for pivotally connecting one end of said bucket antirollback control rod to said bucket control linkage, a sleeve slideably supporting the other end of said bucket antirollback control rod, means for pivotally mounting said sleeve to said support structure to allow pivoting movement of said other end of said bucket antirollback control rod through the arcuate path defined by the surface of said antirollback control member during raising and lowering of said lift arm means and to allow sliding movement of said bucket antirollback control rod towards said bucket antirollback control member when said lift arm means is raised and said bucket is rolled back and away from said bucket antirollback control member when said lift arm means is lowered and said bucket is rolled forward, and linkage means connecting said bucket antirollback control member to said bucket operating linkage for pivoting said bucket antirollback control member towards said other end of said bucket antirollback control rod in response to movement of said bucket operating lever into its first position and for pivoting said bucket antirollback control member away from said other end in response to movement of said bucket operating lever into its second position, whereby said other end of said bucket antirollback control rod engages the arcuate control surface of said bucket antirollback control member when said bucket is level and said lift arm means is raised to prevent movement of said bucket operating lever into its first position and rollback of said bucket past its level position.
Claim 2
Dependent Claim
435 words
A material-handling device comprising in combination a support structure, lift arm means pivotally connected to said support structure, a bucket, means for pivotally supporting said bucket on said lift arm means, means for raising and lowering said lift arm means, a bucket operating system including bucket control linkage connected between said bucket and said lift arm means, a hydraulic circuit comprised of a bucket control cylinder connected between said bucket control linkage and said lift arm means and a bucket control valve, a bucket operating lever, a bucket operating linkage connecting said operating lever, to said bucket control valve for operating said valve and cylinder in response to movement of said bucket operating lever, whereby movement of said bucket operating lever into a first position rolls said bucket back relative to said lift arm means and movement of said bucket operating lever into a second position rolls said bucket forward relative to said lift arm means, a bucket antirollback control member having an arcuate control surface, means for pivotally mounting said bucket antirollback control member on said support structure, a bucket antirollback control rod, means for pivotally connecting one end of said bucket antirollback control rod to said bucket control linkage, a sleeve slideably supporting the other end of said bucket antirollback control rod, means for pivotally mounting said sleeve to said support structure to allow pivoting movement of said other end of said bucket antirollback control rod through the arcuate path defined by the surface of said antirollback control member during raising and lowering of said lift arm means and to allow sliding movement of said bucket antirollback control rod towards said bucket antirollback control member when said lift arm means is raised and said bucket is rolled back and away from said bucket antirollback control member when said lift arm means is lowered and said bucket is rolled forward, and linkage means connecting said bucket antirollback control member to said bucket operating linkage for pivoting said bucket antirollback control member towards said other end of said bucket antirollback control rod in response to movement of said bucket operating lever into its first position and for pivoting said bucket antirollback control member away from said other end in response to movement of said bucket operating lever into its second position, whereby said other end of said bucket antirollback control rod engages the arcuate control surface of said bucket antirollback control member when said bucket is level and said lift arm means is raised to prevent movement of said bucket operating lever into its first position and rollback of said bucket past its level position.
Claim 3
Dependent Claim
71 words
A material-handling device in accordance with claim 1 in which said sleeve terminates short of both ends of said bucket antirollback control rod and said sleeve mounting means includes means for pivotally mounting said sleeve beyond the end thereof whereby the pivoting movement of said bucket antirollback control rod is about a point beyond the end of said sleeve and short of the other end of said bucket antirollback control rod.
Claim 4
Dependent Claim
245 words
A material-handling device comprising in combination a support structure, lift arm means, a bucket, means for pivotally supporting said bucket on one end of the said lift arm means, means for connecting said lift arm means to said support structure, means for operating said bucket to roll said bucket forward and back relative to said lift arm means, a control member, a bucket antirollback link, means for supporting said link between said operating means and said control member for sliding movement of said link towards said control member in response to rollback of said Bucket relative to said lift arm means and for sliding movement away from said control member in response to rolling forward of said bucket relative to said lift arm means, said link having a free end facing said control member, means for connecting said control member to said bucket operating means for moving said control member toward said link in response to rollback of said bucket and for moving said control member away from said link in response to rolling forward of bucket relative to said lift arm means, said control member having a surface positioned to be engaged by the free end of said antirollback link when said bucket is at its level position and said operating means is actuated to roll said bucket back relative to said lift arm means, whereby additional movement of said bucket operating means to roll back the bucket past its level position is prevented.
Claim 5
Dependent Claim
245 words
A material-handling device comprising in combination a support structure, lift arm means, a bucket, means for pivotally supporting said bucket on one end of the said lift arm means, means for connecting said lift arm means to said support structure, means for operating said bucket to roll said bucket forward and back relative to said lift arm means, a control member, a bucket antirollback link, means for supporting said link between said operating means and said control member for sliding movement of said link towards said control member in response to rollback of said Bucket relative to said lift arm means and for sliding movement away from said control member in response to rolling forward of said bucket relative to said lift arm means, said link having a free end facing said control member, means for connecting said control member to said bucket operating means for moving said control member toward said link in response to rollback of said bucket and for moving said control member away from said link in response to rolling forward of bucket relative to said lift arm means, said control member having a surface positioned to be engaged by the free end of said antirollback link when said bucket is at its level position and said operating means is actuated to roll said bucket back relative to said lift arm means, whereby additional movement of said bucket operating means to roll back the bucket past its level position is prevented.
Claim 6
Dependent Claim
135 words
A material-handling device in accordance with claim 3 in which said bucket operating means includes an operating lever, movable into a first position to roll back said bucket relative to said lift arm means, in which said means connecting said control member to said bucket operating means includes a mechanical linkage interconnecting said control member and said operating lever for movement of said control member towards said link in response to movement of said operating lever into its first position and for movement of said operating lever out of its first position in response to movement of said control member away from said link, whereby engagement of said link with said control member causes movement thereof away from said link to prevent operation of said lever to roll back said bucket past its level position.
Claim 7
Dependent Claim
42 words
A material-handling device in accordance with claim 3 in which said control member includes an arcuate control surface, and in which said link supporting means includes means for allowing pivotal movement of said one end of said link along said arcuate path.
Claim 8
Dependent Claim
42 words
A material-handling device in accordance with claim 3 in which said bucket operating means includes bucket control linkage interconnecting said bucket and said lift arm means, and in which the other end of said link is pivotably connected to said bucket linkage.
Claim 9
Dependent Claim
352 words
A bucket antirollback mechanism for a material-handling device comprising in combination a support structure, lift arm means, means for pivotally supporting one end of said lift arm means on said support structure, means for raising and lowering said lift arm means, a bucket, means for pivotally supporting said bucket on the other end of said lift arm means, bucket control linkage connected between said bucket and said lift arm means, an operating lever, means connecting said operating lever to said bucket control linkage for operating said linkage to roll said bucket back relative to said lift arm means when said operating lever is in a first position and for rolling said bucket forward relative to said lift arm means when said operating lever is in a second position, an antirollback control member, an antirollback control link, means for connecting one end of said link to said bucket control linkage and for supporting the other end of said link for pivotable and sliding movement of said link towards said control member during rollback of said bucket and away from said control member during forward roll of said bucket, said other end of said link being free and facing said control member, and means for connecting said control member to said operating lever for moving said control member towards said control link during movement of said operating lever into its first position and for moving said control member away from said control link during movement of said operating lever into its second position, said control member having a surface positioned to be engaged by the free end of said control link when said operating lever is in said first position and said raising means has raised said lift arm means beyond a predetermined angle, said control member moving away fRom said link in response to the free end of said link engaging said control member when said operating lever is in its first position and said bucket is rolled back to its level position to move said operating lever out of said first position thereby preventing rollback of said bucket past its level position.
Claim 10
Dependent Claim
352 words
A bucket antirollback mechanism for a material-handling device comprising in combination a support structure, lift arm means, means for pivotally supporting one end of said lift arm means on said support structure, means for raising and lowering said lift arm means, a bucket, means for pivotally supporting said bucket on the other end of said lift arm means, bucket control linkage connected between said bucket and said lift arm means, an operating lever, means connecting said operating lever to said bucket control linkage for operating said linkage to roll said bucket back relative to said lift arm means when said operating lever is in a first position and for rolling said bucket forward relative to said lift arm means when said operating lever is in a second position, an antirollback control member, an antirollback control link, means for connecting one end of said link to said bucket control linkage and for supporting the other end of said link for pivotable and sliding movement of said link towards said control member during rollback of said bucket and away from said control member during forward roll of said bucket, said other end of said link being free and facing said control member, and means for connecting said control member to said operating lever for moving said control member towards said control link during movement of said operating lever into its first position and for moving said control member away from said control link during movement of said operating lever into its second position, said control member having a surface positioned to be engaged by the free end of said control link when said operating lever is in said first position and said raising means has raised said lift arm means beyond a predetermined angle, said control member moving away fRom said link in response to the free end of said link engaging said control member when said operating lever is in its first position and said bucket is rolled back to its level position to move said operating lever out of said first position thereby preventing rollback of said bucket past its level position.
Claim 11
Dependent Claim
178 words
A material-handling device comprising in combination lift arm means, a bucket pivotally supported on said lift arm means, means for raising and lowering said lift arm means, means for operating said bucket to roll said bucket forward and back relative to said lift arm means, a control member, a bucket antirollback link, means for supporting one end of said link adjacent to said control member for reciprocable and pivotable movement of said link relative to said control member in response to operation of said bucket and said lift arm means, and means for supporting said control member for movement relative to said one end of said link in response to operation of said bucket operating means whereby engagement of said one end of said link and said control member prevents rollback of said bucket past its level position when said lift arm means is raised in which the reciprocal and pivotable movement of said one end of said link defines an arcuate path, and in which said control member includes an arcuate control surface defined by said path.
Claim 12
Dependent Claim
178 words
A material-handling device comprising in combination lift arm means, a bucket pivotally supported on said lift arm means, means for raising and lowering said lift arm means, means for operating said bucket to roll said bucket forward and back relative to said lift arm means, a control member, a bucket antirollback link, means for supporting one end of said link adjacent to said control member for reciprocable and pivotable movement of said link relative to said control member in response to operation of said bucket and said lift arm means, and means for supporting said control member for movement relative to said one end of said link in response to operation of said bucket operating means whereby engagement of said one end of said link and said control member prevents rollback of said bucket past its level position when said lift arm means is raised in which the reciprocal and pivotable movement of said one end of said link defines an arcuate path, and in which said control member includes an arcuate control surface defined by said path.
Claim 13
Dependent Claim
84 words
A material-handling device in accordance with claim 8 including bucket control linkage interconnecting said bucket and said lift arm means, and means connecting the other end of said link to said linkage for movement of said one end of said link towards said control member during rollback of said bucket and raising of said lift arm means and for moving said one end of said link away from said control member during forward roll of said bucket and lowering of said lift arm means.
Claim 14
Dependent Claim
146 words
A material-handling device in accordance with claim 8 in which said bucket operating means includes a hydraulic cylinder connected between said bucket and said lift arm means and a hydraulic valve for controlling operation of said cylinder to alternatively roll said bucket forward and back, and mechanical linkage means connecting said control member to said valve for moving said control member towards said one end of said link in response to operation of said valve to roll back said bucket and for moving said control member away from said one end of said link in response to operation of said valve to roll said bucket forward, whereby engagement of said link and said control member causes movement of said control member away from said link to close said valve and prevent rollback of the bucket past its level position when said lift arm means are raised.
References Cited (Backward Citations)
US3402840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |