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| Number | Title | Issue Date |
| 6137255 | Apparatus and method of controlling a linear motor door operator A control system (10) for a door operator (12) for moving a door includes a position sensor (54) to be coupled to the door (28) for sensing the position of the door and generating a position signal. An acceleration sensor (48) is to be coupled to the door... | 10/24/2000 |
| 5955709 | Elevator control system featuring all-electromagnet vibration and centering elevator car controller for coupling a roller arranged on a pivot arm to a guide rail An elevator control system has a roller guide assembly comprising a plurality of rollers arranged in a cluster having at least one roller connected thereto for coupling an elevator car to a guide rail mounted on an elevator hoistway wall. The roller guide... | 09/21/1999 |
| 5816369 | Method of mounting an elevator roller guide on a guide rail A method of installing roller guides in an elevator system so as to be centered on their respective T-rails. In the case of an elevator using either and active or semi-active roller guide system, the method uses the position transducers that are part of t... | 10/06/1998 |
| 5749444 | Contactless slide guide for elevators A contactless slide guide or magnetic bearing for guiding an elevator vertically along a hoistway rail has one or more electromagnet actuators spring-mounted within a yoke attached to the elevator car at a corner thereof. The positioning of the electromag... | 05/12/1998 |
| 5652414 | Elevator active guidance system having a coordinated controller The invention features an elevator system including an elevator car (12) having a frame that operates on guide rails of an elevator shaft of a building. The elevator car (12) has a rigid body motion in a global coordination system (X, Y, Z) kinematically ... | 07/29/1997 |
| 5617023 | Industrial contactless position sensor A contactless position sensor uses at least a first magnetic flux source on one side of an object, wherein a sensor is responsive to the flux, for providing a sensed signal indicative of varying positions (x) of the first magnetic flux source and the obje... | 04/01/1997 |
| 5597988 | Control system for elevator active vibration control using spatial filtering A control system for compensating for horizontal vibrations in a travelling elevator includes at least one horizontal vibration sensor disposed in a plane wherein high frequency vibrations are spatially filtered. Each sensor is provided with a control cir... | 01/28/1997 |
| 5535853 | Actuator having a two ended actuator rod movable longitudinally and transversely An actuator having a part that is capable of moving both longitudinally and transversely may include a housing having a longitudinal axis with respect to which the movable actuator part can move within the housing both longitudinally and transversely. The... | 07/16/1996 |
| 5467850 | Permanent magnet, magnetodynamic safety brake for elevators and the like A safety brake (14) for an elevator (or other) car has a plurality of permanent magnets (21, 23) arranged along the car guide rail (13) with alternate magnets disposed with opposite polar orientation so as to provide loops of flux (23) between the magnets... | 11/21/1995 |
| 5467243 | Electromagnet control system Alternating current provided at an angular frequency (ω) for powering an electromagnet force actuator having a leakage inductance (L1) whereby the alternating current is controlled by a voltage reference and a feedback signal indicative of the... | 11/14/1995 |
| 5439075 | Elevator active suspension system An elevator car vertically guided along a hoistway rail has horizontal motions controlled by means of an actuator wherein horizontal acceleration of the elevator car and relative horizontal displacement between the car and the rail is sensed for controlli... | 08/08/1995 |
| 5400872 | Counteracting horizontal accelerations on an elevator car A method and apparatus for actively counteracting a disturbing force acting on a suspended elevator cab in a frame moving vertically in a hoistway is disclosed. A manifestation of the disturbing force such as acceleration is sensed and counteracted, for e... | 03/28/1995 |
| 5373123 | Electromagnetic gaging of elevator rails and other structures Orthogonal sets (26, 28) of coils (21-24) are each connected for differential response to an alternating magnetic field in a taut wire (20) disposed adjacent a rail (76) in an elevator hoistway. The wire is powered with AC current (34, 38) which is also u... | 12/13/1994 |
| 5367132 | Centering control for elevator horizontal suspension An improved centering control for an elevator horizontal suspension having at least one actuator and includes a circuit for disabling the control or braking the actuator in response to an error signal indicative of the difference between a reference signa... | 11/22/1994 |
| 5329077 | Elevator ride quality Rail learning is combined with feedback in a control for improving ride quality in an elevator. For example, a pre-stored signal indicative of a horizontal deviation of the rail's surface from a vertical reference is retrieved and used along with a sensed... | 07/12/1994 |
| 5322144 | Active control of elevator platform A method and apparatus for actively counteracting a disturbing force acting horizontally on a platform moving vertically in a hoistway is disclosed. A manifestation of the disturbing force such as acceleration is sensed and counteracted, for example, by e... | 06/21/1994 |
| 5321217 | Apparatus and method for controlling an elevator horizontal suspension A method and apparatus for counteracting a disturbing force acting on an elevator platform in a hoistway comprises sensing the acceleration and position of the platform and applying a force between the platform and the hoistway in proportion to the magnit... | 06/14/1994 |
| 5308938 | Elevator active suspension system A method and apparatus for actively counteracting a disturbing force acting on a suspended elevator cab moving vertically in a hoistway is disclosed. A manifestation of the disturbing force such as acceleration is sensed and counteracted, for example, by ... | 05/03/1994 |
| 5294757 | Active vibration control system for an elevator, which reduces horizontal and rotational forces acting on the car A method and apparatus for actively counteracting a disturbing force acting on a platform moving vertically in a hoistway is disclosed. A manifestation of the disturbing force such as rotational acceleration or translational accelerations indicative there... | 03/15/1994 |
| 5274203 | "Smart" position transducer system for elevators An elevator system (FIG. 1) employing a microprocessor-based group controller (FIG. 2 ) communicating with the cars (3, 4) using car position and velocity information provided by a "smart" primary position transducer (SPPT) system to control the motion of... | 12/28/1993 |
| 5035301 | Elevator speed dictation system The present invention is directed to an elevator speed dictation system for use in controlling the acceleration and deceleration of an elevator. During the acceleration phase, the speed dictation system of the present invention calculates a dictated accel... | 07/30/1991 |
| 4527662 | Elevator speed control To control an elevator motor, a first analog signal, the profile of which defines the velocity characteristics during acceleration, is generated in response to a motor jerk signal, a signal to accelerate the motor. This first analog signal is then multipl... | 07/09/1985 |
