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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7637356 | Elevator system with safety device on elevator doors In an elevator system that has an elevator hoistway, a plurality of hoistway doors arranged above each other each with at least one horizontally moveable hoistway door panel, and an elevator car with a car door that has at least one horizontally movable car door pan... | 12/29/2009 |
| 7607517 | Door coupler and locking device A door coupler provided with coupling elements actuated by means of a linkage so as to engage a counter element provided on the landing door and a locking hook that has a closed position and a released position. The release of the locking hook from the closed positi... | 10/27/2009 |
| 7464794 | Coupling device for elevator car doors and landing doors The invention is relating to a coupling device for elevator car (5) and landing doors of the kind comprising moving cams (3) integral with the car door (5) and driving the landing door in front of a story landing by means of a coupling plate int... | 12/16/2008 |
| 7398862 | Car door lock A door locking system for a freight or passenger elevator or goods lift installation having vertically spaced landings served by a vertically movable car, the landings and car each being protected by associated horizontal slide doors, a mechanical interlock device a... | 07/15/2008 |
| 7370731 | Device for connecting a car door with a shaft door and for locking and unlocking the doors, a device for emergency unlocking of a car door and a method for emergency unlocking of a car door A device for connecting a car door with a shaft door and for emergency unlocking of a car door consists of an entrainer arranged at the car door, which entrainer detachably connects, together with a roller pair arranged at the shaft door, the car door with the shaft... | 05/13/2008 |
| 7350623 | Elevator door apparatus An elevator door apparatus includes an engaging device which engages car doors with hall doors. The engaging device uses a spring unit to urge a movable vane provided in each of the car doors. While the doors are moving, engaging rollers supported by the hall doors ... | 04/01/2008 |
| 7308973 | Door interlocking system A door panel position control mechanism for a multiple panel horizontal sliding door assembly of a freight elevator landing. The mechanism comprises a multiple node scissors linkage that is configured to be easily installed and initially adjusted and which has its p... | 12/18/2007 |
| 7270218 | Sealing device for elevator door A device moves a door seal for a displaceable door panel of an elevator car in an elevator installation with an elevator shaft having shaft doors. The movable door seal is arranged so that the door panel in a closed state is sealed off. The device includes an entrai... | 09/18/2007 |
| 7264088 | Device with movable door seal for a displaceable door of an elevator installation and an elevator installation with such a device A device moves a door seal for a displaceable door panel of an elevator car in an elevator installation with an elevator shaft having shaft doors. The movable door seal is arranged so that the door panel in a closed state is sealed off. The device includes an entrai... | 09/04/2007 |
| 7255203 | Clutch for coupling a car door of an elevator car with a landing door of an elevator system A clutch couples a car door of an elevator car with a landing door of an elevator system, wherein the car door is movable with respect to the elevator car by a first actuator. The clutch includes at least one coupling element and a second actuator. The coupling elem... | 08/14/2007 |
| 7252179 | Elevator-door latching and opening device Elevator doors have operating bars that are pivoted on a car door and that serve to actuate shaft-door actuating rollers that operate shaft doors. These doors are operated by an apparatus having an actuating device that changes a spacing between the operating bars a... | 08/07/2007 |
| 7100745 | Equipment at an elevator car for temporarily coupling a car door leaf with a shaft door leaf for actuation of a car door unlocking means Equipment for temporarily coupling an elevator car door leaf with a shaft door leaf and for actuating a car door lock includes a coupling mechanism arranged at the car door leaf with two entraining runners mounted on two pivotable adjusting elements. The spacing bet... | 09/05/2006 |
| 7097002 | Elevator door drive device An elevator door drive device, which opens and closes at least one car door leaf and a corresponding shaft door leaf, includes a coupling mechanism mounted at the car door leaf for transmitting the car door leaf movement to the shaft door leaf with two parallel entr... | 08/29/2006 |
| 7077242 | Device for connecting a car door with a shaft door and for locking and unlocking the doors, a device for emergency unlocking of a car door and a method for emergency unlocking a car door A device for connecting a car door with a shaft door and for emergency unlocking of a car door consists of an entrainer arranged at the car door, which entrainer detachably connects, together with a roller pair arranged at the shaft door, the car door with the shaft... | 07/18/2006 |
| 6474448 | Modular lock for elevator doors A modular lock (10) for elevator doors, in particular for locking and unlocking the floor doors of elevators and hoists, comprises a first fixed plate (12) and a second plate (14) articulated on the same, cooperating with the blades of the car activator a... | 11/05/2002 |
| 6446759 | Door coupler and latch system for elevator car and landing doors A coupling (8) for engaging an elevator car door (16) and a landing door (20) includes a fixed vane (36) and a movable vane (38). The movable vane is positioned by an engagement link (42) in response to movement of the car door (16) and the presence or ab... | 09/10/2002 |
| 6374952 | Elevator door apparatus A car cam and locking roller locking structure that opens and closes elevator doors so that the lateral sliding of the car will not affect the opening of the doors. The invention is a mechanism to open and close elevator doors that is used to start the op... | 04/23/2002 |
| 6340073 | Elevator door system An improved elevator door system for reducing vibration and noise in opening/closing a car door and a hatch door and allowing fast operation by releasing a landing door lock device before the car door moves. The elevator door system includes a hatch door;... | 01/22/2002 |
| 6328133 | Elevator door with improved clutch device Disclosed is an elevator door with an improved clutch device suitable for increasing clutch speed and decreasing clutch distance of a car door and a hatch door. The elevator door with an improved clutch device comprises a hatch door having a pair of clutc... | 12/11/2001 |
| 6173815 | Door coupler and locking device A door coupler (4) comprising gripping elements (14,15) moved by a linkage (2) and designed to grip a counterpart (17,18) on the landing door, and a lock catch (10) which has a closed position and an open position. The releasing movement of the lock catch... | 01/16/2001 |
| 6164417 | Procedure for closing an elevator landing door, and a door coupler In the procedure for closing an elevator landing door (3,4), the landing door is coupled with the car door (1,2) by a door coupler, and the car door is moved by an actuator provided in conjunction with the elevator car. During the initial phase of the clo... | 12/26/2000 |
| 6062345 | Elevator interlocking mechanism An elevator interlocking mechanism interlocks the elevator cage door and each landing door, and includes a release mechanism for release of the interlocks when the elevator cage is at rest at a landing. The elevator cage interlock comprises an elevator do... | 05/16/2000 |
| 5988320 | Arrangement in the opening and closing of automatic elevator door, and a door coupler In the arrangement in the opening and closing of automatic elevator doors, the door coupler (20) is mounted on the car door so as to be movable in the direction of movement of the car door. The door coupler (20) is connected to a lever (21) whose first en... | 11/23/1999 |
| 5950766 | Procedure for closing an elevator landing door, and a door coupler In the procedure for closing an elevator landing door (3,4), the landing door is coupled with the car door (1,2) by a door coupler, and the car door is moved by an actuator provided in conjunction with the elevator car. During the initial phase of the clo... | 09/14/1999 |
| 5896952 | Apparatus for coupling elevator doors A door coupling apparatus for establishing and releasing an operative connection between an elevator car door and an elevator shaft door includes a drive unit (D, P) mounted on the car door for moving a roller double lever (1) into engagement with an entr... | 04/27/1999 |
| 5855253 | Mechanical security device for elevators used between two levels This invention relates to a security device for an elevator which operates between two levels, comprised of a cabin (1) closed by a swinging door (2) which opens to the exterior, the cabin (1) moving by translational vertical motion from a lower level up ... | 01/05/1999 |
| 5732796 | Elevator car evacuation deterrent device An elevator door evacuation deterrent device in combination with a moving vane elevator door coupler having a pair of coupler vanes pivotally connected by links to form a parallelogram movable between a compressed position, an expanded interlock position ... | 03/31/1998 |
| 5690188 | Elevator door system An elevator door system including a landing door, a car door provided on a car, a latch device for locking the landing door when the landing door is closed. The elevator door system also includes a door locking device provided on the landing door composed... | 11/25/1997 |
| 5651428 | Stationary actuator moving vane elevator car door coupling A coupling for causing an elevator car door to engage an elevator hoistway door includes a pair of vanes, each end of each vane pivoted on a link connecting it with the other vane, the links being disposed for rotation between said two vanes on an elevato... | 07/29/1997 |
| 5651427 | Elevator door coupling and hold-close apparatus An elevator door hold-close device in combination with a moving vane elevator door coupler having first and second vanes pivotally connected by links to form a parallelogram pivotally movable between a first compressed uncoupled position and an expanded c... | 07/29/1997 |
| 5636715 | Elevator door structure and method of adjusting the same The invention concerns a door structure for an elevator which allows a service engineer to easily adjust a gap between a vibration damping engaging mechanism on a cage sliding door, the width of which varies through the opening/closing operation of the ca... | 06/10/1997 |
| 5584365 | Telescoping elevator door system A telescoping elevator door apparatus for an elevator having a car for travel in a hoistway is provided. The door apparatus comprises a fast elevator door, a slow elevator door, a first drive, and a second drive. The fast and slow doors are positioned to ... | 12/17/1996 |
| 5575357 | Entraining apparatus for elevator doors An entraining apparatus for the coupling, unlatching and entraining of elevator shaft doors includes an entraining parallelogram which is movable laterally and is actuated by a door drive on an elevator car. The entraining parallelogram has two vertically... | 11/19/1996 |
| 5544720 | Entraining and unlatching apparatus for elevator doors An apparatus for entraining and unlatching an elevator car door and a shaft door includes an electromagnet having a movable armature attached to a first bellows mounted on a wall of the car. An entraining and unlatching cam is attached to a second bellows... | 08/13/1996 |
| 5538106 | Rotationally stiff elevator car door coupling A coupling for causing an elevator car door to engage an elevator hoistway door includes a pair of vanes, each end of each vane pivoted on a link connecting it with the other vane, the links being disposed for rotation between said two vanes on an elevato... | 07/23/1996 |
| 5505280 | Elevator door system An elevator car has a car door having a arcuate cross-section and attaching to and rotating about a pivot. A hoistway door has an arcuate cross-section and is selectively coupled to a car door to open and close therewith.... | 04/09/1996 |
| 5487449 | Magnetic elevator door coupling A magnetic coupling device is disposed on an elevator car door in a position to engage a magnetic vane disposed on a hoistway door which is to be opened in unison with the car door. The magnetic coupling unit may comprise either an electromagnet or a perm... | 01/30/1996 |
| 5485896 | Rotary elevator car door coupling A horizontally stiff, but vertically yielding coupling between an elevator car door and an elevator hoistway door includes a brushless torque actuator which rotates a member (disposed on the elevator door) between a first, clearance position and a second,... | 01/23/1996 |
| 5435415 | Cammed wedge elevator car door coupling An elevator hoistway door is coupled to an elevator car door so as to be opened and closed in unison therewith by means of a pair of shoes which are mounted on the elevator door and have cammed surfaces that allow the shoes to be spread so as to be wedged... | 07/25/1995 |
| 5427204 | Elevator hoistway and car door lock and coupling A hoistway and a car door are coupled by means of a vane attached to one of the hoistway door and the car door, and a mating channel mounted to the other of the hoistway or car door. A mechanism allows the channel to extend from its mounting towards the v... | 06/27/1995 |
