| Patent Number |
Title Of Patent |
Date Issued |
| RE30492 |
Reverse direction guidance system for lift truck |
January 27, 1981 |
| An automatic guidance device for a self-powered cargo moving vehicle operated by a vehicle-borne sensor which follows a buried, energized wire path and which includes sensor means mounted either between the fixed and steerable axles or in front of the fixed axle of the vehicle for guidin |
| 4182126 |
Fork lift hydraulic servo control valve |
January 8, 1980 |
| A servo controlled, proportional valve is connected in parallel with a forklift truck control valve to regulate the speed at which the fork is raised or lowered by shunting the forklift pump output to the hydraulic fluid reservoir during the raising of the fork and by restricting the |
| 4160488 |
Extended width sensor |
July 10, 1979 |
| The effective sensor width of a path following vehicle guidance system is enlarged by having a first gain control amplifier for amplifying the sum of the path sensor signals, a second gain control amplifier for amplifying the difference of the path sensor signals and a third amplifier, i |
| 4083422 |
Bolt-on guidance system for lift truck |
April 11, 1978 |
| An automatic guidance device for a self-powered cargo-moving vehicle is bolted directly over the steering column of the vehicle and is operated by a vehicle-borne sensor which follows a magnetic wire path, the guidance system having an automatic, sensor-directed mode, a manually operated |
| 4077486 |
Power steering device for lift truck |
March 7, 1978 |
| A power steering device for a self-powered cargo-moving vehicle has a detented steering wheel which can be shifted by the operator to select either a manually operated, power steering mode, a manual override mode in which the guidance device is effectively disconnected and steering is |
| 4043418 |
Reverse direction guidance system for lift truck |
August 23, 1977 |
| An automatic guidance device for a self-powered cargo moving vehicle operated by a vehicle-borne sensor which follows a buried, energized wire path and which includes sensor means mounted either between the fixed and steerable axles or in front of the fixed axle of the vehicle for guidin |
| 4040500 |
Guidance system for lift truck |
August 9, 1977 |
| An automatic guidance device for a self-powered cargo-moving vehicle is operated by a vehicle-borne sensor which follows a buried, energized wire path and includes a circuit which first switches on the automatic guidance circuit when the vehicle is heading away from the wire after it has |
