Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1974-11-01
1976-04-27
Schaefer, Robert K.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
340 19R, B66B 146
Patent
active
039528375
ABSTRACT:
An elevator system selectively moves and stops an elevator car at a plurality of landings in response to the operation of a signaling system wherein a controlled rectifier operates with a control circuit to command the stopping of an elevator car at a floor in response to the manual movement of a call button. An electromagnet has a coil connected to the gating circuit of the remotely located controlled rectifier and includes a core element having a first end connected to a first pole of a permanent magnet and a second end providing a pivotal support to an armature removably connected to a second pole of the permanent magnet. The manual call button is connected to a flexible, resilient member which is connected to the armature at a position located between the electromagnet and the permanent magnet and provides a snap action response. Manual movement of the button from an unactuated to an actuated position provides a forward pulse while release of the button and movement from the actuated position to the actuated position provides a reverse pulse with both pulses capable of providing control signals. A shunt circuit includes a shunt projection connected to a magnetic shield and is selectively contacted by the armature when actuated to rapidly collapse the flux within the electromagnet. An alternative embodiment permits the armature to rapidly separate simultaneously from both the electromagnet core and the permanent magnet through an operating rod specially positioned between the electromagnet and the permanent magnet.
REFERENCES:
patent: 2267271 (1941-12-01), Edwards
patent: 2525769 (1950-10-01), Bruns
patent: 3506096 (1970-04-01), Robaszkiewicz
patent: 3774728 (1973-11-01), Metzler et al.
Armor Elevator Company
Duncanson Jr. W. E.
Schaefer Robert K.
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