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Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 8186483 | Elevator braking device An elevator assembly (20) includes braking devices (30) for controlling movement of an elevator car (22). A braking device (30) includes an electrical actuator (62) for controlling relative movement between a carriage (42) a... | 05/29/2012 |
| 7299898 | Progressive safety device A progressive safety device for an elevator includes a brake unit and an actuating unit. The brake unit has a first brake shoe with first spring assemblies and a triangular rotatable support with second and third brake shoes. The actuating unit has an electromagneti... | 11/27/2007 |
| 7267201 | Emergency brake device of elevator An emergency brake apparatus for an elevator system is installed on an elevator cage or a balance weight of the elevator system and includes a grip member with slant surfaces and a pressing surface sandwiching a guide rail, a pressing member disposed movably between... | 09/11/2007 |
| 6325184 | Gravity brake A mechanical gravity brake that prevents hoisted loads within a shaft from free-falling when a loss of hoisting force occurs. A loss of hoist lifting force may occur in a number of situations, for example if a hoist cable were to break, the brakes were to... | 12/04/2001 |
| 6164418 | Elevating work platform structure An elevating work platform structure for use in constructing an elevator channel before and after the elevator car has been placed into the elevator channel includes a horizontal beam, two side posts connected to two ends of the horizontal beam, two upper... | 12/26/2000 |
