US3716104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for the power lifting installation of a tractor
Assignee: Kloeckner Humboldt Deutz AG
•
Filing: 1969-12-08
•
Granted: 1973-02-13
•
Expires: 1989-12-08
Abstract
Abstract A tractor with a power operated implement lift and a hydraulically adjustable speed transmission. The driving speed of the tractor is detected and the load torque on the tractor is detected and the detected driving speed and torque values are compared and produce a control movement when there is a decrease of speed of the tractor due to an increase of load torque on the tractor or vice versa. The control movement operates to cause the power operated lift to adjust the elevation of an implement connected thereto when there is a change in either the speed of the tractor or the load torque thereon without a change in the other in the same sense.
Inventors
- 👤 W Koenig
- 👤 H Adams
- 👤 F Heidjann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:23
CPC Classifications
B; B62; B62D; B62D49/00; B62D49/02; A; A01; A01B; A01B63/00; A01B63/02; A01B63/10; A01B63/111; B62D11/00; B62D11/02; B62D11/06; B62D11/10; B62D11/105
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
250 words
In a control arrangement for the power operated implement lift of a tractor having a stepless variable speed transmission with cooperating drive members which include means that tend to move relatively toward decreased drive ratio position when the load on the transmission increases; first control means movable in a first direction to cause the lift to lower an implement connected thereto into working position and in a second direction to cause the lift to raise the implement to idle position, movable second control means operatively connected to said drive members and adjustable to select a driving ratio for said transmission, means responsive to movement of said drive members as to driving speed brought about by an increase in load on the tractor for proportionately moving said second control means, movable third control means responsive to drive torque with respect to operational resistance of the load on said tractor and movable in response to increases in said load, a comparing device in which drive torque and driving speed are taken and the comparison value serves for controlling the power operated implement lift, first means operatively connecting said comparing device to said first control means, second means operatively connecting said comparing device to said second control means, and third means connecting said third control means to said comparing device, each of said second and third control means when moved making said comparing device effective to move said first control means to cause the lift to raise the implement to idle position thereof.
Claim 2
Dependent Claim
250 words
In a control arrangement for the power operated implement lift of a tractor having a stepless variable speed transmission with cooperating drive members which include means that tend to move relatively toward decreased drive ratio position when the load on the transmission increases; first control means movable in a first direction to cause the lift to lower an implement connected thereto into working position and in a second direction to cause the lift to raise the implement to idle position, movable second control means operatively connected to said drive members and adjustable to select a driving ratio for said transmission, means responsive to movement of said drive members as to driving speed brought about by an increase in load on the tractor for proportionately moving said second control means, movable third control means responsive to drive torque with respect to operational resistance of the load on said tractor and movable in response to increases in said load, a comparing device in which drive torque and driving speed are taken and the comparison value serves for controlling the power operated implement lift, first means operatively connecting said comparing device to said first control means, second means operatively connecting said comparing device to said second control means, and third means connecting said third control means to said comparing device, each of said second and third control means when moved making said comparing device effective to move said first control means to cause the lift to raise the implement to idle position thereof.
Claim 3
Dependent Claim
250 words
In a control arrangement for the power operated implement lift of a tractor having a stepless variable speed transmission with cooperating drive members which include means that tend to move relatively toward decreased drive ratio position when the load on the transmission increases; first control means movable in a first direction to cause the lift to lower an implement connected thereto into working position and in a second direction to cause the lift to raise the implement to idle position, movable second control means operatively connected to said drive members and adjustable to select a driving ratio for said transmission, means responsive to movement of said drive members as to driving speed brought about by an increase in load on the tractor for proportionately moving said second control means, movable third control means responsive to drive torque with respect to operational resistance of the load on said tractor and movable in response to increases in said load, a comparing device in which drive torque and driving speed are taken and the comparison value serves for controlling the power operated implement lift, first means operatively connecting said comparing device to said first control means, second means operatively connecting said comparing device to said second control means, and third means connecting said third control means to said comparing device, each of said second and third control means when moved making said comparing device effective to move said first control means to cause the lift to raise the implement to idle position thereof.
Claim 4
Dependent Claim
250 words
In a control arrangement for the power operated implement lift of a tractor having a stepless variable speed transmission with cooperating drive members which include means that tend to move relatively toward decreased drive ratio position when the load on the transmission increases; first control means movable in a first direction to cause the lift to lower an implement connected thereto into working position and in a second direction to cause the lift to raise the implement to idle position, movable second control means operatively connected to said drive members and adjustable to select a driving ratio for said transmission, means responsive to movement of said drive members as to driving speed brought about by an increase in load on the tractor for proportionately moving said second control means, movable third control means responsive to drive torque with respect to operational resistance of the load on said tractor and movable in response to increases in said load, a comparing device in which drive torque and driving speed are taken and the comparison value serves for controlling the power operated implement lift, first means operatively connecting said comparing device to said first control means, second means operatively connecting said comparing device to said second control means, and third means connecting said third control means to said comparing device, each of said second and third control means when moved making said comparing device effective to move said first control means to cause the lift to raise the implement to idle position thereof.
Claim 5
Dependent Claim
113 words
A control arrangement according to claim 1, in which said comparing device is a scale-beam addition lever, said second control means including a control valve, hydraulic means pertaining to said drive members and having the supply Of fluid thereto under the control of said valve, means effective upon movement of said second control means due to an increase in load on said tractor moving said valve to increase the hydraulic pressure supplied to one of said drive members, said third control means comprising a spring-loaded piston urged in the said one direction of movement thereof by the said hydraulic pressure supplied to said one drive member and spring urged in the other direction.
Claim 6
Dependent Claim
72 words
A control arrangement according to claim 2, in which transmission is infinitely adjustable and has adjustable input and output pulley means and a flexible drive element entrained about said pulley means, each pulley having a respective fluid actuated adjusting means connected to said valve, the said fluid actuated adjusting means pertaining to said input pulley means being hydraulically connected to said piston of said third control means that engages said addition lever.
Claim 7
Dependent Claim
30 words
A control arrangement according to claim 3, which includes means for automatically effectively adjusting the point along said addition lever where said second control means acts on said addition lever.
Claim 8
Dependent Claim
101 words
A control arrangement according to claim 4, in which said comparing device lever is pivotally supported at one end, said second control means acting on said lever between the ends thereof, said third means comprising a pivotally supported two arm lever means having one arm connected to said first control means and a second arm adjacent the other end of said comparing device lever, said lever having a cylinder on said other end, said piston being mounted in said cylinder and being reciprocable therein axially of said comparing device lever and engaging said second arm of said two arm lever means.
Claim 9
Dependent Claim
62 words
A control arrangement according to claim 5, which includes a semi-circular intermediate member mounted on said second arm of said two arm lever means and presenting a plane sliding surface to said piston, said intermediate member being adjustable relative to said second arm to vary the angle of said sliding surface to the direction of the length of said comparing device lever.
References Cited (Backward Citations)
US2731849A
Cited
US2629306A
Cited
US3251422A
Cited
DE1195997B
Cited
GB1132475A
Cited
GB1182973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |