US3738502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fork lift leveling control
Assignee: Massey Ferguson Inc
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Filing: 1971-08-26
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Granted: 1973-06-12
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Expires: 1991-08-26
Abstract
Abstract A load-lifting mechanism for fork-lift type load handling device which is equipped with power actuated extendable links for adjustable support of the device on the ground and automatic control means including a vertical level sensing device interconnected between the load lifting mechanism of the device and the extendable links for automatic adjustment of the extendable links in response to an inclined position of the load lifting device while simultaneously interrupting movement of the load until the lifting device is brought back into level position.
Inventors
- 👤 F Noller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:15
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/07559; B62; B62D; B62D37/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
In a load handling apparatuS on a vehicle having a mast stabilized by hydraulically extensible ground engaging stabilizer arms on opposite sides of the mast, a manually operated control valve for each arm and a power source, an automatic control system for stabilizing the mast comprising: a sensing device for detecting angular deviation of the mast to either side of the vehicle of the load handling apparatus to a vertical axis, an actuator for receiving a signal from said sensing device, a hydraulic valve operated by said actuator for overriding the stabilizer arm manual valve by directing two-way flow to either one of the stabilizer arms around the manual control valves by connecting the stabilizer arms to the power source whenever said sensing device detects angular deviation of the mast in the direction of either one of the stabilizer arms.
Claim 2
Dependent Claim
140 words
In a load handling apparatuS on a vehicle having a mast stabilized by hydraulically extensible ground engaging stabilizer arms on opposite sides of the mast, a manually operated control valve for each arm and a power source, an automatic control system for stabilizing the mast comprising: a sensing device for detecting angular deviation of the mast to either side of the vehicle of the load handling apparatus to a vertical axis, an actuator for receiving a signal from said sensing device, a hydraulic valve operated by said actuator for overriding the stabilizer arm manual valve by directing two-way flow to either one of the stabilizer arms around the manual control valves by connecting the stabilizer arms to the power source whenever said sensing device detects angular deviation of the mast in the direction of either one of the stabilizer arms.
Claim 3
Dependent Claim
158 words
In a load handling apparatus on a vehicle having a load lifting device for raising or lowering of a load, and ground engaging hydraulically extensible stabilizer arms to prevent the load handling apparatus from leaning toward either side of the vehicle, a load leveling system comprising a source of power for actuation of the adjustable stabilizer arms and power control means including an inclination sensing device for detecting angular deviation to either side of the vehicle of the load handling apparatus to a vertical axis, a leveling control and an actuator connecting said sensing device with said leveling control, said leveling control selectively connecting said power source to the adjustable stabilizer arms and the load lifting device upon a signal from said sensing device to said actuator to automatically prevent movement of the load lifting device and actuate an adjustable stabilizer arm whenever a predetermined side inclination of the load handling apparatus toward an adjustable stabilizer arm occurs.
Claim 4
Dependent Claim
158 words
In a load handling apparatus on a vehicle having a load lifting device for raising or lowering of a load, and ground engaging hydraulically extensible stabilizer arms to prevent the load handling apparatus from leaning toward either side of the vehicle, a load leveling system comprising a source of power for actuation of the adjustable stabilizer arms and power control means including an inclination sensing device for detecting angular deviation to either side of the vehicle of the load handling apparatus to a vertical axis, a leveling control and an actuator connecting said sensing device with said leveling control, said leveling control selectively connecting said power source to the adjustable stabilizer arms and the load lifting device upon a signal from said sensing device to said actuator to automatically prevent movement of the load lifting device and actuate an adjustable stabilizer arm whenever a predetermined side inclination of the load handling apparatus toward an adjustable stabilizer arm occurs.
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |