Patent US3707834A successfully refreshed from Google Patents.
US3707834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Height control device for a harvester cutter
Assignee: Individual
•
Filing: 1970-10-21
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Granted: 1973-01-02
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Expires: 1990-10-21
Abstract
Abstract A height adjustment device for a harvester cutter has a control valve controlling a piston and cylinder for raising and lowering the cutter, a height control member which is adjustable for preselecting the ground clearance of the cutter and means responsive to the adjustment of the height control member and the position of the cutter for discontinuing the supply of pressure fluid to the piston and cylinder when the cutter has been lowered to a preselected position determined by the adjustment of the height control member. In one arrangement, these means comprise a check valve between the control valve and the piston and cylinder, and in another arrangement a linkage for actuating the control valve.
Inventors
- 👤 G Schumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:18
CPC Classifications
A; A01; A01D; A01D41/00; A01D41/12; A01D41/14; A01D41/141
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
In a harvester, a cutter and a support means supporting said cutter for elevational movement, a piston and cylinder operatively connected between said support means and cuTter for raising and lowering said cutter, a manually operable control valve for controlling the supply of pressure fluid to said piston and cylinder, conduit means operatively connected to and extending between said control valve and piston and cylinder for directing pressure fluid therebetween, a height control member which is manually adjustable for preselection of the ground clearance of said cutter, said control member being carried by said support means, and flow control means operatively connected to said control member and said cutter for responding to the adjustment of said height control member and the position of said cutter for automatically discontinuing the flow of pressure fluid to said piston and cylinder, and thereby discontinuing the lowering of said cutter, when said cutter has been lowered to a height preselected by adjustment of said height control member, said flow control means being operatively connected to said conduit means for controlling the flow of pressure fluid therethrough.
Claim 2
Dependent Claim
182 words
In a harvester, a cutter and a support means supporting said cutter for elevational movement, a piston and cylinder operatively connected between said support means and cuTter for raising and lowering said cutter, a manually operable control valve for controlling the supply of pressure fluid to said piston and cylinder, conduit means operatively connected to and extending between said control valve and piston and cylinder for directing pressure fluid therebetween, a height control member which is manually adjustable for preselection of the ground clearance of said cutter, said control member being carried by said support means, and flow control means operatively connected to said control member and said cutter for responding to the adjustment of said height control member and the position of said cutter for automatically discontinuing the flow of pressure fluid to said piston and cylinder, and thereby discontinuing the lowering of said cutter, when said cutter has been lowered to a height preselected by adjustment of said height control member, said flow control means being operatively connected to said conduit means for controlling the flow of pressure fluid therethrough.
Claim 3
Dependent Claim
36 words
The combination of claim 1, wherein said flow control means comprises a check valve communicating with said conduit means for controlling the flow of the pressure fluid between said control valve and said piston and cylinder.
Claim 4
Dependent Claim
47 words
The combination of claim 2, wherein said check valve comprises a valve member operatively connected with the remainder of said flow control means for moving automatically into an open position on operation of said piston and cylinder by said manually operable control valve to raise said cutter.
Claim 5
Dependent Claim
31 words
The combination of claim 2, wherein said flow control means connects said check valve to said cutter for controlling said check valve in response to adjustment of said height control member.
Claim 6
Dependent Claim
32 words
A height adjustment device as claimed in claim 1, comprising means connecting said control valve to said cutter for closing said control valve on lowering of said cutter to said preselected height.
Claim 7
Dependent Claim
79 words
A height adjustment device as claimed in claim 5, and further comprising an actuating member for actuating said control valve, said connecting means comprising a linkage connecting said actuator to said control valve, means connecting said linkage to said cutter for deflecting said linkage to operate said control valve in response to movement of said cutter, and means connecting said linkage to said height control member for adjusting the deflection of said linkage in accordance with said preselected height.
References Cited (Backward Citations)
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US3461655A
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |