Patent US2836994A successfully refreshed from Google Patents.
Patent US3808784A successfully refreshed from Google Patents.
US3808784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse lockout
Assignee: Case LLC
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Filing: 1973-03-16
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Granted: 1974-05-07
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Expires: 1993-03-16
Abstract
Abstract A reverse drive lockout mechanism for a combine harvester having a crop-gathering platform which is provided with ground-engaging control fingers, the lockout mechanism preventing the harvester from inadvertently being driven in reverse when such control fingers are in ground proximity. A normally de-energized solenoid, mounted on the speed lever console, maintains its plunger projected and in the path of movement of the speed lever, thus preventing entry of the lever into the reverse speed range. A switch assembly becomes effective when the platform is raised a predetermined distance from the ground to establish an electrical circuit through the solenoid winding, thus retracting the plunger and allowing the speed lever to be moved in the reverse speed range.
Inventors
- 👤 E Krukow
- 👤 F Gardner
- 👤 N Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:40
CPC Classifications
B; B62; B62D; B62D33/00; B62D33/06; B62D33/0617; A; A01; A01D; A01D41/00; A01D41/12; B62D33/063; B62D33/073
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
In a harvester of the type having a chassis, a crop-gathering header pivotally connected at its proximate end for swinging movement between a lower operative ground-scanning position and a raised inoperative position, hydraulic means for effecting movement of said header, a plurality of ground-sensing fingers on the distal end of said header and effective upon displacement thereof incident to their travel over the ground to control said hydraulic means, and a speed control lever operable in a forward speed range and a reverse speed range, the improvement which comprises a solenoid fixedly mounted on said chassis and having a plunger which is movable between a projected position wherein it is disposed in the path of movement of said lever and precludes entry thereof into said reverse speed range, and a retracted position wherein it is withdrawn from said path, an electric circuit for said solenoid, and contact means operatively disposed in said circuit and effective when the header closely approaches its lower ground-scanning position to actuate said solenoid and cause projection of said plunger, said contact means being effective when the header approaches its raised position to actuate the solenoid and cause retraction of said plunger.
Claim 2
Dependent Claim
196 words
In a harvester of the type having a chassis, a crop-gathering header pivotally connected at its proximate end for swinging movement between a lower operative ground-scanning position and a raised inoperative position, hydraulic means for effecting movement of said header, a plurality of ground-sensing fingers on the distal end of said header and effective upon displacement thereof incident to their travel over the ground to control said hydraulic means, and a speed control lever operable in a forward speed range and a reverse speed range, the improvement which comprises a solenoid fixedly mounted on said chassis and having a plunger which is movable between a projected position wherein it is disposed in the path of movement of said lever and precludes entry thereof into said reverse speed range, and a retracted position wherein it is withdrawn from said path, an electric circuit for said solenoid, and contact means operatively disposed in said circuit and effective when the header closely approaches its lower ground-scanning position to actuate said solenoid and cause projection of said plunger, said contact means being effective when the header approaches its raised position to actuate the solenoid and cause retraction of said plunger.
Claim 3
Dependent Claim
45 words
A harvester as set forth in claim 1, wherein said contact means comprises a first contact element supported on said chassis, and a second contact element supported on the header and movable bodily therewith into and out of effective engagement with said first contact element.
Claim 4
Dependent Claim
37 words
A harvester as set forth in claim 2, wherein one of said contact elements is yieldably supported on its supporting member by a cushioning spring and the other contact element is fixedly mounted on its supporting member.
Claim 5
Dependent Claim
31 words
A harvester as set forth in claim 3, wherein said one contact element is yieldingly supported on the header and said other contact element is fixedly supported on the harvester chassis.
Claim 6
Dependent Claim
67 words
A harvester as set forth in claim 4, wherein spring means are provided for yieldingly biasing said solenoid plunger to its projected position, and said contact elements remain out of electrical engagement with each other when the header is in its lowered position and move into such engagement as the header approaches its raised position to thus energize the solenoid circuit and effect retraction of the plunger.
Claim 7
Dependent Claim
197 words
A harvester as set forth in claim 1, wherein spring means are provided for yieldingly biasing said solenoid plunger to its projected position, and said contact means comprises a guide rod pivoted at its lower end to a medial region of the header and movable bodily therewith, a first contact element in the form of a guide bracket fixedly secured to said chassis and through which the upper region of said guide rod loosely and slidingly projects, a helical cushioning spring loosely encircling said guide rod the supported at its lower end on a fixed region of the rod, a second and cooperating contact element in the form of a sleeve slidingly mounted on said guide rod and supported on the upper end of said spring, means electrically connecting said contact elements in the solenoid circuit whereby engagement therebetween will effect energization of the circuit and consequent retraction of said plunger, the effective length of said spring, and its disposition on the guide rod, being such that said contact elements remain out of engagement with each other when the header is in its lowered position and move into such engagement when the header approaches its raised position.
Claim 8
Dependent Claim
41 words
A harvester as set forth in claim 6, wherein means are provided for adjusting the vertical disposition of said spring on the guide rod to thus vary the distance between said contact elements when the header is in its lowered position.
Claim 9
Dependent Claim
63 words
A harvester as set forth in claim 6, wherein said guide bracket is electrically connected to the harvester chassis, an insulating sleeve is interposed between said contact sleeve and the guide rod, means are provided for electrically connecting said contact sleeve to one terminal of the solenoid, and means are provided for electrically connecting the other terminal of the solenoid to said chassis.
Claim 10
Dependent Claim
36 words
A harvester as set forth in claim 1 including, additionally, a manually operable switch disposed in the solenoid circuit and effective upon actuation thereof to override said contact means and thus cause retraction of said plunger.
Claim 11
Dependent Claim
29 words
A harvester as set forth in claim 6, wherein said electric circuit further includes a normally open manually operable push button switch effective when closed to energize said solenoid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |