Abstract: A testing system is removably connected to a control of an elevator system and selectively operated to perform a plurality of testing sequences. The testing system is removably connected with a closed loop elevator control and selectively and independently provides a number of artificial control signals characteristic of an operating condition for controlling the operation of the elevator system under test. The testing system may be used in a testing sequence with elevator systems employing gated rectifying circuits to accurately monitor gate pulses and other operating functions therein.

Abstract: A hydraulic elevator drive system utilizes an elevator car speed signal and a commanded velocity signal to provide an electrical error signal and controls the operation of a fluid control regulating the fluid flow between a hydraulic actuator which moves the car, a hydraulic pump and a fluid reservoir. The fluid control includes a combined check and lowering valve and a by-pass valve selectively operated by a common control element including a dynamically operated control piston responding to the error signal. Another check valve couples the fluid pump to the fluid control whle a pair of manually preset control valve regulate the supply of fluid to the control piston for providing pre-established acceleration limitations to the elevator car.

Abstract: A floor position sensor monitors the movement of an elevator car and provides a first predetermined number of inputs each corresponding to a predetermined floor and connected to a first signal converting circuit providing a second predetermined number of coded outputs less than the first predetermined number in response to an input position signal appearing at one of the first inputs corresponding to the floor where the elevator car is located. Each position indicator is remotely located from the sensor and includes opto-isolating circuits connected to receive the second outputs and provides a third predetermined number of outputs photo-electrically isolated from and in response to the second outputs and connected to a second signal converting circuit providing a fourth predetermined number of coded outputs responsive to the third outputs.

Abstract: A transportation system such as an elevator utilizes a static power converter to directly energize a D.C. drive motor and another static power converter to directly energize a friction type braking element and automatically selects a mode of operation best suited for safe operation from a plurality of modes including a normal operation, a reduced speed operation, an emergency landing operation and an emergency operation in response to certain sensed malfunctions within the system including a decrease in the source voltage to a predetermined magnitude, an increase in the armature current of the D.C. motor to a predetermined magnitude, a decrease in the field current of the D.C.

Abstract: One layer of three heat sinks for conducting alternating current and a second layer of two heat sinks for conducting direct current sandwich twelve controlled rectifiers which are electrically arranged to provide a pair of gated rectifier bridge networks for changing from a current of one frequency to a current of another frequency. Six rod-like bolts are removably secured within threaded openings of certain heat sinks and pass through openings within other heat sinks and assist together with locking nuts in compressing the sandwiched assembly. Three of the bolts are electrically insulated from the direct current heat sinks for supplying alternating current to the rectifying devices through the alternating current heat sinks while two of the bolts are electrically insulated from the alternating current heat sinks for conducting direct current to the rectifying devices through the direct current heat sinks.

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.

Abstract: A solid state static converter receives a three-phase A.C. input and directly supplies direct current to a D.C. motor operating a traction sheave to control the movement of an elevator car in response to an error signal derived by the selective summation of a speed signal from a tachometer and a pair of vehicle speed command signals. One command signal is a function of the commanded velocity versus time and operatively controls the system during acceleration, constant velocity and a portion of deceleration. The other command signal is a function of the commanded velocity versus time as modified by the sensed position of the car and solely operatively controls the system during a portion of deceleration to stop the vehicle at a selected landing.

Abstract: A solid state static converter is connected to receive a three-phase A.C. input and directly supply a direct current output to a D.C. motor which operates a traction sheave to control the movement of an elevator car. The magnitude and direction of the direct current output from the static converter is controlled by an error signal derived by the summation of a speed signal obtained from a tachometer coupled to the motor drive shaft and a vehicle speed command signal provided by a pattern generator and having maximum velocity, acceleration and rate of change of acceleration limitations for safe and smooth control of the elevator car and for accurate stopping at landings.

Abstract: A first solid-state static converter receives a threephase A.C. input and directly supplies direct current to a D.C. motor armature circuit to operate a traction sheave and control the movement of an elevator car in response to an error signal derived by the summation of a speed signal from a tachometer and a vehicle speed command signal while a second solid-state static converter receives a three-phase A.C. input and directly supplies direct current to a field circuit of the D.C. motor in response to the operation of a field gating control circuit.