Silo unloader lowering control
AssigneeVeda, Inc.
InventorGlen D. Hansen
Life of this patent
Estimating the term…
Abstract
A top unloading silo unloader pendently supported from a tripod with a cable connected to a motor operated winch. An automatic silo unloader let-down control system is operably connected to the winch motor to energize the motor once during each revolution of the unloader to lower the unloader in the silo. The let-down control system has a control switch mounted on the unloader which is actuated by the rotating part of the unloader once during each revolution of the part. An automatic time delay unit is adjustable to control the duration of operation of the winch motor thereby controlling the amount of let-down of the silo unloader.
Claims10
In a silo unloader operable to remove material from a tower silo, said unloader having a material collector and means for discharging material therefrom, said silo unloader including a portion rotatable within the silo and means for rotating the same, winch means having an electric motor, a cable connecting the winch means and silo unloader, means suspending the cable from the upper portion of the silo whereby upon operation of the motor the silo unloader is vertically moved in the silo, and control means electrically connected to the electric motor for controlling its operation and thereby the vertical position of the silo unloader in the silo,
- the improvment wherein said control means includes a control switch non-rotatably mounted with respect to the silo unloader,
- said switch having an actuator disposed in the path of and operably engagable by the rotatable portion of the silo unloader once during each revolution of said rotatable portion thereby to trigger the control switch,
- and means connected to said switch for operating said electric winch motor for a limited period of time to lower the silo unloader each time the said switch actuator triggers the control switch.
Dependencies are inferred from the claim text.