US3618718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake actuated return to neutral mechanism
Assignee: Ingersoll Equipment Co Inc
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Filing: 1970-06-10
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Granted: 1971-11-09
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Expires: 1990-06-10
Abstract
Abstract A hydrostatic transmission control linkage having a shift lever movable towards a drive position and a neutral position and to which is attached a friction plate adapted to normally retain the lever in the drive position by means of frictional contact with a plunger yieldably urged against the plate. The plunger is attached to one end of an actuating linkage, the other end of which is secured to a brake pedal in such a manner that, by depressing the brake pedal, the frictional contact between the friction plate and the plunger will be broken to automatically cause movement of the shift lever into the neutral position.
Inventors
- 👤 Andrew Blaauw
- 👤 Paul H Stibbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:04
CPC Classifications
G; G05; G05G; G05G13/00; G05G2700/00; G05G2700/22; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/2066
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
201 words
In a control mechanism for a hydrostatic transmiSsion having a shift lever movable between a first and a second position, said shift lever normally being retained in the first position by a force and having a tendency to move to said second position when said force is removed, a plate member attached to the shift lever for movement therewith, said plate member having a friction surface, a control member supported for longitudinal movement in a direction toward and away from said plate member, a plunger attached to one end of the control member adjacent said plate member, resilient means normally urging said plunger against said friction surface of the plate member to thereby retain said shift lever in the first position, said resilient means being yieldable to accommodate movement of said plunger away from said friction surface of said plate member allowing movement of said shift lever to said second position; the improvement wherein said control member comprises a linkage attached at one end to a brakepedal, the other end of said linkage being supported in a stationary support, said plunger being provided at the extreme end with a button adapted to frictionally contact said friction surface of said plate member.
Claim 2
Dependent Claim
201 words
In a control mechanism for a hydrostatic transmiSsion having a shift lever movable between a first and a second position, said shift lever normally being retained in the first position by a force and having a tendency to move to said second position when said force is removed, a plate member attached to the shift lever for movement therewith, said plate member having a friction surface, a control member supported for longitudinal movement in a direction toward and away from said plate member, a plunger attached to one end of the control member adjacent said plate member, resilient means normally urging said plunger against said friction surface of the plate member to thereby retain said shift lever in the first position, said resilient means being yieldable to accommodate movement of said plunger away from said friction surface of said plate member allowing movement of said shift lever to said second position; the improvement wherein said control member comprises a linkage attached at one end to a brakepedal, the other end of said linkage being supported in a stationary support, said plunger being provided at the extreme end with a button adapted to frictionally contact said friction surface of said plate member.
Claim 3
Dependent Claim
31 words
In a control mechanism as defined in claim 1, said resilient means comprising a spring disposed between said button and said stationary support to constantly urge said button toward said plate.
Claim 4
Dependent Claim
42 words
In the control mechanism as defined in claim 2, said button being adjustably secured to said plunger by means of a nut, said nut forming a collar around said plunger to provide an abutment for said spring opposite from said stationary support.
Claim 5
Dependent Claim
134 words
In combination with a self-neutralizing hydrostatic transmission and brake control mechanism comprising a transmission shift lever movable between a first driving position and a second neutral position, and a brake pedal connected to a linkage for brake actuation, said linkage having a free end, the improvement of friction means connecting said lever with said linkage, said friction means comprising a first member attached to said lever and a second member attached to the free end of said linkage, and means urging said first and said second members into frictional contact to retain said lever in the first driving position, said means being yieldable to a force applied on said brake pedal to decrease frictional contact between said first and said second member to thereby free said lever for movement to said second neutral position.
Claim 6
Dependent Claim
134 words
In combination with a self-neutralizing hydrostatic transmission and brake control mechanism comprising a transmission shift lever movable between a first driving position and a second neutral position, and a brake pedal connected to a linkage for brake actuation, said linkage having a free end, the improvement of friction means connecting said lever with said linkage, said friction means comprising a first member attached to said lever and a second member attached to the free end of said linkage, and means urging said first and said second members into frictional contact to retain said lever in the first driving position, said means being yieldable to a force applied on said brake pedal to decrease frictional contact between said first and said second member to thereby free said lever for movement to said second neutral position.
Claim 7
Dependent Claim
53 words
The combination as defined in claim 4, in which said first member comprises a plate having a free end provided with friction surface and said second member comprising a plunger attached to the free end of said linkage having an end comprising a button for contact with said friction surface on said plate.
Claim 8
Dependent Claim
26 words
The combination as defined in claim 5, said means urging said first and said second member into frictional contact comprising a spring disposed around said plunger.
Claim 9
Dependent Claim
86 words
The combination as defined in claim 6, in which said free end of said linkage is supported in a stationary support, said stationary support comprising opposite space flanges, said plate means and said plunger being disposed between said flange, a collar adjustably disposed around said plunger adjacent said button, said spring means being disposed between said collar and one of said flanges to urge said plunger and said button towards the opposite flange to thereby frictionally clamp said plate between said opposite flange and said button.
Claim 10
Dependent Claim
89 words
In a control system for a tractor equipped with a self-neutralizing hydrostatic transmission having a shift lever movable between neutral and tractor-driving positions, said tractor also having a brake linkage, the improvements comprising a plate movable with said shift lever, a detent biased by a spring into engagement with the plate to normally prevent movement of said detent and said brake linkage, so that actuation of the brake linkage moves the detent against the bias of the spring to allow the shift lever to move To its neutral position.
Claim 11
Dependent Claim
89 words
In a control system for a tractor equipped with a self-neutralizing hydrostatic transmission having a shift lever movable between neutral and tractor-driving positions, said tractor also having a brake linkage, the improvements comprising a plate movable with said shift lever, a detent biased by a spring into engagement with the plate to normally prevent movement of said detent and said brake linkage, so that actuation of the brake linkage moves the detent against the bias of the spring to allow the shift lever to move To its neutral position.
Claim 12
Dependent Claim
100 words
In the combination defined in claim 8, said means interconnecting said detent and said brake linkage comprising a plunger attached to said linkage, said detent comprising a button retained at the end of said plunger an yieldably urged against said plate in frictional contact therewith to normally restrain said lever against movement from a driving position to a neutral position, said brake linkage also having a brake pedal adapted for actuation of said linkage to apply said brake and simultaneously release said frictional contact between said plate and said button to permit movement of said lever to said neutral position.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |