Mechanism for preventing operation of a bin unloading auger when out of its unloading position
AssigneeAllis-Chalmers Corporation
InventorMaynard E. Walberg
Life of this patent
Estimating the term…
Abstract
A cam operated safety switch (51) prevents the clutch device (21) for the drive for the unloading auger (34) from being shifted from a clutch disengaged position to a clutch engaged position whenever the unloading conveyor (37) is out of its crop unloading position. A branch circuit (98) with a diode (99) interconnects the tube swing switch (63) and the circuit (92) for declutching the unloading auger drive so that when the unloading conveyor (37) is swung from its unloading position to its transport position the clutch device (21) will automatically be placed in its clutch disengaged position.
Claims9
A harvester having a bin for the harvested crop, an unloading conveyor swingable between a transport position and a range of bin unloading positions including a driven material moving member, a drive mechanism for the material moving member including a clutch device shiftable between clutch engaged and clutch disengaged positions by a hydraulic actuator, and a control for operating the clutch device characterized by
- electrically controlled valve means connected in controlling relation to said hydraulic actuator including a valve having clutch engaging and clutch disengaging positions,
- a source of pressurized fluid connected to said valve,
- an electric control system for said valve means including a safety switch shiftable between a first position in which said clutch device cannot be shifted from its clutch disengaged position to its clutch engaged position and a second position in which said clutch device may be shifted from its clutch disengaged position to its clutch engaged position, and
- operating means for the safety switch responsive to the position of said unloading conveyor to automatically place said safety switch in said first position when said conveyor is moved out of its range of unloading positions and to automatically place said safety switch in said second position when said conveyor is in its unloading position.
A harvester having a bin for the harvested crop, and an unloading conveyor swingable between a transport position and a predetermined range of bin unloading positions including a driven material moving member, a drive mechanism for the material moving member including a clutch device operated by a hydraulic actuator, a conveyor swing mechanism operated by a hydraulic motor, and a control for positioning the swingable unloading conveyor and for operating the clutch device characterized by
- a first electrically controlled valve connected in controlling relation to said hydraulic actuator having clutch engaging and clutch disengaging positions,
- a second electrically controlled valve connected in controlling relation to said hydraulic motor having unloading and transport positions,
- a source of pressurized fluid connected to said valves,
- an electric control system for said valves including a safety switch shiftable between a first position in which said first electrically controlled valve is prevented from being in its clutch engaging position and a second position in which said first electrically controlled valve may be shifted to its clutch engaging position, and
- operating mechanism responsive to the position of said conveyor operative to automatically place said safety switch in said first position when said conveyor is displaced from its predetermined range of unloading positions and to automatically place said safety switch in said second position when said conveyor is in its range of unloading positions.
Dependencies are inferred from the claim text.