Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7360630 | Elevator positioning system The present invention provides an elevator position compensation system which minimizing the re-leveling of an elevator car in an elevator shaft. The elevator car is suspended in the shaft by an elevator cable system and elevator motor, wherein the elevator position... | 04/22/2008 |
| 7353916 | Elevator supervision A method and system for supervising the safety of an elevator having a car driven by a drive within a hoistway wherein a travel parameter (XABS,X″Acc,X′IGB) of the car is sensed and continually compared with a similarly sensed tr... | 04/08/2008 |
| 7350625 | Shaft door monitoring system for an elevator installation A shaft monitoring system for an elevator installation includes a contactless sensor enabling recognition from the elevator car whether a shaft door lock and a shaft door leaf are in a correct locked setting. A securing device mechanically secures the shaft door loc... | 04/01/2008 |
| 7292144 | Apparatus and method for contact-less switching An apparatus and method for use with a railroad dragging equipment detecting (DED) system that detects objects hanging from and dragged beneath a train as the train travels along rails of a railroad track. A generator supplies a first signal and is coupled to a magn... | 11/06/2007 |
| 7252180 | Situation-dependent reaction in the case of a fault in the region of a door of an elevator system An elevator system includes an elevator car having a car door, a drive unit for moving the elevator car along an elevator shaft wall provided with shaft doors and a controller for controlling movement of the elevator car along the elevator shaft wall. A separate fau... | 08/07/2007 |
| 7137484 | Safety system for restraining movement of elevator car when car doors are open A safety system for restraining movement of an elevator car employing a bi-directional safety and an associated car mounted governor with a linkage, between the governor and the elevator car door, including a brake cable and clutch, wherein the governor would operat... | 11/21/2006 |
| 6945363 | Method of contactlessly monitoring elevator shaft doors A method for monitoring shaft doors of a elevator installation uses at least one contactlessly acting shaft door monitoring sensor to emit a beam of electromagnetic waves, wherein at least during specific detection phases the beam extends over several floors and is ... | 09/20/2005 |
| 6863160 | Service barrier A service barrier for elevator equipment and a method for deploying the same, said barrier comprising a floor plate and a plurality of leaves hinged along vertical axes, said floor plate pivotally mounted in front of said elevator equipment and at least one of said ... | 03/08/2005 |
| 6625934 | Method for monitoring environmental conditions in restricted spaces An environmental detection system is particularly suited for elevator hoistways and other locations where access is difficult or restricted. The inventive system comprises a fire rated access cage which is disposed within the hoistway in a desired locatio... | 09/30/2003 |
| 6550585 | Hoistway intrusion detection Elevator, exhibiting an elevator shaft (34) and a car (32) which is movably provided inside the elevator shaft (34), and a safety installation (2), which is designed in such a way that it can take the elevator out of service in a dangerous situation, char... | 04/22/2003 |
| 6382362 | Optical monitoring system for hoistway door interlocks A system for monitoring an elevator door in a hoistway. The elevator door is movable between a closed position and an open position. The system includes a transmitter for emitting an optical signal and an interlock device for latching the elevator door. T... | 05/07/2002 |
| 6050369 | Elevator shaftway intrusion device using optical imaging processing There is provided an elevator shaftway intrusion detector which utilizes an image detector including a camera for generating a detection field within a zone of detection including the elevator shaft-side roof and floor and an image processing means for ge... | 04/18/2000 |
| 5950767 | Optical door lock A safety chain of an elevator system utilizes optical fiber to verify mechanical locking of elevator doors. The elevator doors have locks which incorporate the optical fiber to determine if each of the doors has been locked. The optical safety chain provi... | 09/14/1999 |
| 5644111 | Elevator hatch door monitoring system An elevator door monitoring system determines if any hatch door at any floor along an elevator shaft or any other door leading to the shaft is opened while an elevator cab is away from the door. The system includes a plurality of non-contact hatch door mo... | 07/01/1997 |
| 5636714 | Bi-parting elevator door actuator apparatus A bi-parting elevator door actuator apparatus operably connected to a bi-parting door assembly having 1) a door interlock and power control assembly; 2) a bi-fold door actuator assembly; and 3) an electrical control circuit. The door interlock and power c... | 06/10/1997 |
| 5616895 | Door safety circuit for monitoring of story doors in lift installations A door safety circuit for monitoring of story doors in lift installations. The door safety circuit includes a transmitter that produces a non-electrical signal which is guided by a series of conductor portions. The non-electrical signal may be transmitted... | 04/01/1997 |
| 5610374 | Safety string polling system A method of and apparatus for detecting the operative status of each of a series of remote stations connected to a main control in an elevator system includes a step or apparatus for causing the main controller to develop a roll call signal which is trans... | 03/11/1997 |
| 5507365 | Universal lock for a positive safety door, in particular a landing entrance for elevator apparatuses The lock is of the type comprising: a housing that can be fastened to the door frame of the landing entrance, a locking bolt for the landing entrance, a bolt-control lever, an exterior lever-operating arm actuated by a cam in the elevator car, an electric... | 04/16/1996 |
| 5487448 | Device for monitoring a control unit The invention relates to a monitoring device for a control unit having a ety chain. In accordance with the invention, the monitoring device has a testable switching device which is provided with input and output terminals such that a monitoring loop may ... | 01/30/1996 |
| 5482142 | Quiet elevator rotary gate switch An elevator rotary gate switch has a camming surface which is always in contact with a lead of an electrical circuit during operation. The camming surface has an electrical contact or bridge thereon. The camming surface is attached to a lever which inters... | 01/09/1996 |
| 5476157 | Elevator control system with elevator hoistway operation monitoring system and method An elevator control system (40) for automatically controlling the operation of an elevator car (22A) having a car door (24A) in which the elevator moves between different floor levels of an elevator shaft (30A) in which each floor level has associated hoi... | 12/19/1995 |
| 5373915 | Passenger lift with an electric safety interlock A passenger lift incorporates an electronic safety interlock to prevent all movement of the lift, until a restraining belt is fastened. In some embodiments, the interlock is a normally open electric switch located inside the restraining belt's buckle. The... | 12/20/1994 |
| 5321216 | Restraining elevator car motion while the doors are open The invention is directed to a safety circuit which detects when the car is at least a predetermined distance away from a floor landing while a car door is open. The safety circuit, upon detection of this condition, activates a solenoid located on a safet... | 06/14/1994 |
| 5183979 | Elevator governor rope restraint when elevator car moves with car doors open The governor rope on an elevator is provided with an auxiliary brake which is a fail-safe brake and which operates to stop movement of the governor rope when the elevator car moves away from a landing with its doors open. The brake includes two rope gripp... | 02/02/1993 |
| 5159162 | Elevator leveling control device An elevator control device includes an operation control device for controlling the speed of a car by a regular-speed command when the car is in a normal operation, and the operation control device generates a readjusting-speed command for retaining the c... | 10/27/1992 |
| 5107964 | Separate elevator door chain Elevator door chain contacts are isolated from the safety chain in a separate circuit, thus enabling the use of a separate door chain coil for independently checking the status of the door chain itself and for enabling the remainder of the safety chain. T... | 04/28/1992 |
| 5074385 | Call registration apparatus in an elevator system A call registration apparatus for an elevator system includes a call registration lamp and a car call button disposed in an elevator car and connected by a common signal line to a CPU. When the call button is pressed a first time, the CPU registers a call... | 12/24/1991 |
| 5063337 | Electric motor regulation to obtain desired speed curve Regulation of the speed of an electric motor is accomplished by counting the number of periods of AC current and modulating the pulses supplied to the motor. The speed of the motor is regulated according to a speed reference curve. The technique is especi... | 11/05/1991 |
| 5014825 | Rescue operating apparatus for elevator A rescue operating apparatus for an elevator has a device for transmitting a cage door open/close command from an elevator supervising section which receives notice regarding the trouble of the elevator and the stopping of the cage between floors, and an ... | 05/14/1991 |
| 4785914 | Elevator system leveling safeguard control and method An elevator control system with a local area network on the traveling cable and distributed control circuit safeguard for loss of remote microprocessor control with a car door open when floor releveling distance exceeds the landing zone limit. The elevato... | 11/22/1988 |
| 4483420 | Elevator door interlocking apparatus An elevator hatchway door interlocking mechanism. The interlocking mechanism includes a first latch member movably mounted in a housing in the elevator hatchway which engages with a second latch member mounted on the hatchway door. A first contact assembl... | 11/20/1984 |
| 4376971 | System for protection against getting caught in automatically operable doors or windows, particularly of vehicles A system for protection against getting caught in automatically operable doors or windows, particularly of vehicles. Specific intervals of time within which the closing or opening door should reach a given position are preset. When the door does not reach... | 03/15/1983 |
| 4367810 | Elevator car and door motion interlocks An elevator includes a microprocessor-based cab controller mounted on the elevator car to monitor calls for service by passengers in the car, controls the opening and closing of the door, monitors the position of the car relative to an adjacent landing an... | 01/11/1983 |
| 4108281 | Elevator door tampering protection system An automatic elevator system having car movement controls, door controls, a door operating mechanism for automatically opening and closing at least the car door and first switch contacts operable when the car and hoistway doors are closed to permit the ca... | 08/22/1978 |
| 4101007 | Control system for limiting elevator car movement speed unless car doors are fully closed Safety controls for an elevator car in which a switch which is closed when the elevator car door is at least partly open is connected to a relay which interrupts the power to the motor of the car hoisting apparatus when the car speed exceeds a safe value.... | 07/18/1978 |
| 4009767 | Magnetically actuated locking system for elevator doors This invention relates to a device for use in elevators for the unlocking and locking of closed doors, gates, bars or wickets. The device comprises a mechanical locking means arranged at the door, gate, bar or wicket and includes a locking bolt moved to l... | 03/01/1977 |
| 3989123 | Vandal proof interlock switch A conventional elevator system includes an elevator shaft, an elevator cab and means for moving the elevator cab along the shaft. The elevator cab has a sliding cab door to provide access thereto and electrically operated means for moving the cab door. A ... | 11/02/1976 |
| 3967701 | Multi-column lifting apparatus and synchronization control device for same A lifting apparatus of the type having a number of columns supporting a load platform each column driven by an electrical, polyphase current motor whereby sensors on each column, for example potentiometers, produce a signal indicating the height of that c... | 07/06/1976 |
