Patent US3691867A successfully refreshed from Google Patents.
US3691867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control devices
Assignee: Case LLC
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Filing: 1970-01-08
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Granted: 1972-09-19
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Expires: 1990-01-08
Abstract
Abstract Safety lever for the power-shift transmission of a tractor, in which the safety lever can be moved to a transmission-unlocking position wherein the safety lever intervenes adjacent the tractor operator''s seat to block the exit of the operator from the tractor, and in which the safety lever can be moved to a locking position wherein the safety lever no longer intervenes, but at the same time either retains the transmission locked in neutral position or forces the transmission to take a neutralized setting and thereafter causes the transmission to be retained in that setting, for safety of the operator while exiting from the tractor.
Inventors
- 👤 Norman Francis Bradshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:10
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/22; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20396
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
223 words
A control device for an hydraulic system, the control device comprising an hydraulic control valve arranged to be operated by a control lever pivotable in a plane of movement containing a plurality of operating positions of the control lever and a neutral position of the control lever intermediate two of the operating positions, each of the operating positions of the control lever corresponding to an operating position of the control valve and the neutral position of the control lever corresponding to a neutral position of the control valve, and a locking means including a first member mounted on the control lever, and a second member pivotable for movement in a plane parallel to the plane of movement of the control lever, one of the first and second members being a cam follower and the other of the first and second members including opposed cam surfaces and a locating slot between the cam surfaces, whereby, when the second member of the locking means is pivoted while the control lever is in one of the operating positions, the cam follower will cooperate with one of the cam surfaces with consequential pivotal movement of the control lever to the neutral position thereof after which the cam follower may be caused to enter the locating slot to effect locking of the control lever in the neutral position.
Claim 2
Dependent Claim
223 words
A control device for an hydraulic system, the control device comprising an hydraulic control valve arranged to be operated by a control lever pivotable in a plane of movement containing a plurality of operating positions of the control lever and a neutral position of the control lever intermediate two of the operating positions, each of the operating positions of the control lever corresponding to an operating position of the control valve and the neutral position of the control lever corresponding to a neutral position of the control valve, and a locking means including a first member mounted on the control lever, and a second member pivotable for movement in a plane parallel to the plane of movement of the control lever, one of the first and second members being a cam follower and the other of the first and second members including opposed cam surfaces and a locating slot between the cam surfaces, whereby, when the second member of the locking means is pivoted while the control lever is in one of the operating positions, the cam follower will cooperate with one of the cam surfaces with consequential pivotal movement of the control lever to the neutral position thereof after which the cam follower may be caused to enter the locating slot to effect locking of the control lever in the neutral position.
Claim 3
Dependent Claim
74 words
A control device according to claim 3, wherein the second member of the locking means comprises a lock plate having said opposed cam surfaces which are effective to direct said cam follower mounted on the control lever into a said locating slot between the cam surfaces when the lock plate is pivoted in the plane parallel to the plane of movement of the control lever to lock the control lever in the neutral position.
Claim 4
Dependent Claim
14 words
A control device according to claim 3 wherein the cam surfaces are straight surfaces.
Claim 5
Dependent Claim
28 words
A control device according to any one of claim 3, wherein the control lever has single forward and reverse operating positions on either side of the neutral position.
References Cited (Backward Citations)
US1664042A
Cited
US3431792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |