US3870107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool bar lift assist wheel
Assignee: Orthman Manufacturing Inc
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Filing: 1973-06-11
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Granted: 1975-03-11
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Expires: 1993-06-11
Abstract
Abstract A tool bar adapted to carry ground-working tools is carried on the three-point hitch of a tractor and the weight of the tool bar and ground-working tools is in part supported by one or more lift assist wheels extending rearwardly of the tool bar. The wheels are carried on the lower ends of arms pivotally connected to the tool bar and a power cylinder extends from the tool bar to an upstanding post on the arm. An accumulator cylinder positioned on the arm receives fluid from one side of the piston in the power cylinder. A piston in the accumulator is yieldable under a selective pressure applied thereto such that a predetermined upward force on the lift wheel arm causes oil from the power cylinder to flow into the accumulator and then return after the force on the arm has been removed. A telescopic adjustment member extends between the upstanding pivotal post to the arm for selectively setting the power cylinder for the given conditions. Depth control wheels are provided on the forward side of the tool bar.
Inventors
- 👤 Henry K Orthman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/14; A01B63/16; A01B63/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
230 words
A tool bar assembly comprising, an elongated tool bar, hitch means connected to said tool bar, ground working tools on said tool bar, a rearwardly extending arm pivotally connected to said tool bar and a ground-engaging wheel means on the lower end of said arm, a hydraulic power cylinder operatively connected between said tool bar and said arm for raising and lowering said arm, a hydraulic accumulator connected to said power cylinder to receive fluid from said power cylinder when a predtermined upward force is applied to said arm and return said fluid upon said force being removed to relieve strain on the power cylinder and associated hydraulic equipment, said accumulator including a cylinder, a piston movable in said cylinder, a yieldable pressure means for selectively applying pressure to one side of said piston, and said power cylinder being connected to the cylinder of said accumulator on the other side of said piston whereby fluid introduced into said cylinder is opposed by said pressure means, adjustment means being provided for varying the point along said arm where said power cylinder is connected to said arm, said power cylinder being connected at one end to said arm through a post pivotally connected to said arm and said adjustment means is an extendable member connected to and between said post and said arm whereby adjustment of said adjustment means, pivots said post.
Claim 2
Dependent Claim
230 words
A tool bar assembly comprising, an elongated tool bar, hitch means connected to said tool bar, ground working tools on said tool bar, a rearwardly extending arm pivotally connected to said tool bar and a ground-engaging wheel means on the lower end of said arm, a hydraulic power cylinder operatively connected between said tool bar and said arm for raising and lowering said arm, a hydraulic accumulator connected to said power cylinder to receive fluid from said power cylinder when a predtermined upward force is applied to said arm and return said fluid upon said force being removed to relieve strain on the power cylinder and associated hydraulic equipment, said accumulator including a cylinder, a piston movable in said cylinder, a yieldable pressure means for selectively applying pressure to one side of said piston, and said power cylinder being connected to the cylinder of said accumulator on the other side of said piston whereby fluid introduced into said cylinder is opposed by said pressure means, adjustment means being provided for varying the point along said arm where said power cylinder is connected to said arm, said power cylinder being connected at one end to said arm through a post pivotally connected to said arm and said adjustment means is an extendable member connected to and between said post and said arm whereby adjustment of said adjustment means, pivots said post.
Claim 3
Dependent Claim
230 words
A tool bar assembly comprising, an elongated tool bar, hitch means connected to said tool bar, ground working tools on said tool bar, a rearwardly extending arm pivotally connected to said tool bar and a ground-engaging wheel means on the lower end of said arm, a hydraulic power cylinder operatively connected between said tool bar and said arm for raising and lowering said arm, a hydraulic accumulator connected to said power cylinder to receive fluid from said power cylinder when a predtermined upward force is applied to said arm and return said fluid upon said force being removed to relieve strain on the power cylinder and associated hydraulic equipment, said accumulator including a cylinder, a piston movable in said cylinder, a yieldable pressure means for selectively applying pressure to one side of said piston, and said power cylinder being connected to the cylinder of said accumulator on the other side of said piston whereby fluid introduced into said cylinder is opposed by said pressure means, adjustment means being provided for varying the point along said arm where said power cylinder is connected to said arm, said power cylinder being connected at one end to said arm through a post pivotally connected to said arm and said adjustment means is an extendable member connected to and between said post and said arm whereby adjustment of said adjustment means, pivots said post.
Claim 4
Dependent Claim
230 words
A tool bar assembly comprising, an elongated tool bar, hitch means connected to said tool bar, ground working tools on said tool bar, a rearwardly extending arm pivotally connected to said tool bar and a ground-engaging wheel means on the lower end of said arm, a hydraulic power cylinder operatively connected between said tool bar and said arm for raising and lowering said arm, a hydraulic accumulator connected to said power cylinder to receive fluid from said power cylinder when a predtermined upward force is applied to said arm and return said fluid upon said force being removed to relieve strain on the power cylinder and associated hydraulic equipment, said accumulator including a cylinder, a piston movable in said cylinder, a yieldable pressure means for selectively applying pressure to one side of said piston, and said power cylinder being connected to the cylinder of said accumulator on the other side of said piston whereby fluid introduced into said cylinder is opposed by said pressure means, adjustment means being provided for varying the point along said arm where said power cylinder is connected to said arm, said power cylinder being connected at one end to said arm through a post pivotally connected to said arm and said adjustment means is an extendable member connected to and between said post and said arm whereby adjustment of said adjustment means, pivots said post.
Claim 5
Dependent Claim
163 words
A tool bar assembly comprising, an elongated tool bar, hitch means connected to said tool bar, ground working tools on said tool bar, a plurality of forwardly extending depth control wheels secured to said tool bar, means for moving said depth control wheels relative to said tool bar so that the vertical position of said ground working tools may be selectively varied, a rearwardly extending arm pivotally connected to said tool bar and a ground-engaging wheel means on the lower end of said arm, a hydraulic power cylinder operatively connected between said tool bar and said arm for raising and lowering said arm, a hydraulic accumulator connected to said power cylinder to receive fluid from said power cylinder when a predetermined upward force is applied to said arm and return said fluid upon said force being removed to relieve strain on the power cylinder and associated hydraulic equipment, said hitch means cOmprising a three-point hitch including means for connection to a prime mover.
Claim 6
Dependent Claim
163 words
A tool bar assembly comprising, an elongated tool bar, hitch means connected to said tool bar, ground working tools on said tool bar, a plurality of forwardly extending depth control wheels secured to said tool bar, means for moving said depth control wheels relative to said tool bar so that the vertical position of said ground working tools may be selectively varied, a rearwardly extending arm pivotally connected to said tool bar and a ground-engaging wheel means on the lower end of said arm, a hydraulic power cylinder operatively connected between said tool bar and said arm for raising and lowering said arm, a hydraulic accumulator connected to said power cylinder to receive fluid from said power cylinder when a predetermined upward force is applied to said arm and return said fluid upon said force being removed to relieve strain on the power cylinder and associated hydraulic equipment, said hitch means cOmprising a three-point hitch including means for connection to a prime mover.
Claim 7
Dependent Claim
41 words
The structure of claim 2 wherein said three-point hitch includes a pair of brackets on said tool bar for connection to lift arms on the prime mover and an upstanding post for connection to a stabilizer arm on the prime mover.
Claim 8
Dependent Claim
62 words
The structure of claim 1 wherein said accumulator includes a cylinder, a piston movable in said cylinder, a yieldable pressure means for selectively applying pressure to one side of said piston, and said power cylinder being connected to the cylinder of said accumulator on the other side of said piston whereby fluid introduced into said cylinder is opposed by said pressure means.
Claim 9
Dependent Claim
59 words
The structure of claim 4 wherein said power cylinder is of the double-acting type including a piston movable in a cylinder and said piston having a rod being connected to said arm, hydraulic lines being connected to said power cylinder on opposite sides of said piston with said accumulator being connected thereto on the side opposite said piston rod.
Claim 10
Dependent Claim
27 words
The structure of claim 5 wherein said yieldable pressure means is further defined as being gas in said accumulator cylinder on said one side of said piston.
Claim 11
Dependent Claim
37 words
The structure of claim 6 wherein a valve means is provided in communication with said one side of said piston in said cylinder of said accumulator for selectively introducing and removing gas into and from said cylinder.
Claim 12
Dependent Claim
26 words
The structure of claim 4 wherein adjustment means is provided for varying the point along said arm where said power cylinder is connected to said arm.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |