Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7416056 | Emergency elevator system The present invention relates to an elevator system for use during an emergency. The elevator system comprises two elevator shafts constructed adjacent to each other. Each elevator shaft houses an elevator car. The elevator system operates without the use of a build... | 08/26/2008 |
| 7410032 | Pulley arrangement for elevators An elevator cage made up of a car, a support member connected to the car, and a pulley box housing a pair of pulleys mounted to the pulley box by pulley axles. The pulley box is mounted to the support member through one or more points located below a first line P bi... | 08/12/2008 |
| 7311179 | Elevator dampening system A dampening device for use with elevator cars or similar devices prevents damage to objects or persons within the elevator car upon failure of a drive chain. A hydraulic motor regulates the rate of descent. The dampening motor is monitored constantly using a pressur... | 12/25/2007 |
| 7261184 | Elevator system and triangulated support structure for the same The invention comprises a support structure for an elevator system comprising a pit channel module having a first leg and a second leg connected at a corner, a header module having three sides forming a triangle which is disposed in a horizontal plane above the pit ... | 08/28/2007 |
| 7207420 | Installation with support means for driving an elevator car, and corresponding support means An elevator installation has a support device engaging a driven drive pulley for driving an elevator car. The support device loops around the drive pulley at least partly and has a safety section which is so arranged that the safety section interacts with the drive ... | 04/24/2007 |
| 7178637 | Both-way movable body driving mechanism and elevator using the same The invention provides an elevator apparatus comprising a cage 1 disposed inside a path of upward or downward movement vertically movably, a counterweight 2 vertically movable with the upward or downward movement of the cage 1, and a lift drive ... | 02/20/2007 |
| 7156209 | Elevator roping arrangement An elevator installation includes an elevator car located in a hoistway and having a floor, and a rear wall extending upward from the floor. A counterweight is located in the hoistway adjacent to the rear wall of the elevator car. An underslung sheave assembly is lo... | 01/02/2007 |
| 7077241 | Elevator installation with flat-belt-type suspension means arranged in parallel In an elevator installation with an elevator car and a counterweight suspended and driven by several flat-belt-type suspension devices arranged in parallel, the suspension devices are arranged in parallel vertical planes that run diagonal to main horizontal axes of ... | 07/18/2006 |
| 6983826 | Elevator drive belt An elevator drive belt, while applying a friction force thereto, drives an elevator rope which links an elevator cage and a counterweight together. A rubber hardness of the belt ranges from about 50 to 90 degrees of JIS-A hardness so as to suppress creep slip due to... | 01/10/2006 |
| 6860367 | Elevator system having drive motor located below the elevator car An elevator system includes an elevator hoistway defined in a surrounding structure, such as a building. An elevator car and counterweight are located in the hoistway. A drive motor and associated drive sheave are disposed at a bottom portion of the hoistway. The dr... | 03/01/2005 |
| 6446757 | Lock mechanism for lift A cable lift includes a platform supported on posts and raised and lowered by cables. Yoke ends support the platform on the posts by means of dogs which project into openings in latch plates on said posts. The dogs are retracted in order to lower the plat... | 09/10/2002 |
| 6138799 | Belt-climbing elevator having drive in counterweight An elevator system includes a counterweight-drive assembly (26) having a motor (32) and drive pulley (36) mounted internally to engage a drive belt (42) for climbing or descending with respect thereto, resulting in raising or lowering of an elevator car (... | 10/31/2000 |
| 6068087 | Belt-climbing elevator having drive in counterweight and common drive and suspension rope An elevator system includes a counterweight-drive assembly (24) having a motor and drive pulley (26) mounted thereon to engage a belt (16) for climbing or descending with respect thereto, resulting in raising or lowering of an elevator car (12) coupled to... | 05/30/2000 |
| 6032929 | Arrangement in connection with a yoke in a hoisting system for a derrick A hydraulically-operated hoist is disclosed. The hoist includes a plurality of hydraulic piston/cylinder arrangements, each having an upper end. Two guide rails are disposed in parallel with the hydraulic piston/cylinder arrangements. A self-aligning yoke... | 03/07/2000 |
| 5625174 | Linear motor elevator A linear motor elevator includes a linear motor that is permitted motion within the hoistway. The linear motor is mounted in a manner permitting motion of the entire linear motor, including stator, through the hoistway. As a result, the length of the hois... | 04/29/1997 |
| 5573084 | Elevator drive machine placed in the counterweight A rotating elevator motor provided with a traction sheave is placed in the counterweight of an elevator suspended from ropes. The sector-shaped stator of the motor has a diameter (2*Rs) larger than that (2*Rv) of the traction sheave and the elevator ropes... | 11/12/1996 |
| 5513723 | Double-masted crane with improved brake arrangement Lifting apparatus comprising first and second generally vertical masts, an assembly including a frame moveable along the masts, and a load engaging mechanism mounted on the frame, a first brake mechanism which, upon actuation, engages the first mast to pr... | 05/07/1996 |
| 5490577 | Flexible elevator hitch An elevator having a car suspended by a rope in a 2:1 roping arrangement has a sheave for receiving the ropes and a structure for rotatably supporting the sheave. A flexible member is used to attach the structure to a car, which minimizes the transference... | 02/13/1996 |
| 5176225 | Lifting platform for motor vehicles A lifting platform for motor vehicles having two vertically movable columns in which additional lifting elements are disposed is disclosed. The lifting elements are connected to a common drive means via traction means and guide rollers in such a way that ... | 01/05/1993 |
| 5080200 | Ball screw elevator drive system The elevator car is suspended on cables which are entrained on a pulley, and which have ends distal of the car anchored to the hoistway floor. The pulley is journaled on an upper end of a lift tube which is telescoped into a cylindrical housing anchored t... | 01/14/1992 |
| 4783934 | Free-standing assembly and method for making same A roof assembly exemplarily for use in outdoor theatrical and musical productions comprises a roof trusswork elevated by means of a plurality of telescoping legs. The legs are raised in unison so that the roof trusswork maintains the same orientation thro... | 11/15/1988 |
| 4610594 | Container conveyor system The invention provides structure consisting of tracks carrying a transporter which moves horizontally on the tracks. A hoist is suspended from the transporter and the hoist includes an elevator for picking up containers at engagement points above the poin... | 09/09/1986 |
| 4084660 | Lifting device for moving goods between different levels A lifting device for moving two goods carrying platforms between different levels. The platforms are provided to perform a synchronous displacing movement in opposite directions relative to each other in one single path of travel. For the movement of the ... | 04/18/1978 |
