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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7575098 | Attic lift system and method A lift system and method for lifting or lowering items from one level to another within a building is accomplished by providing a lift platform. An upper level support structure having an opening is configured to allow passage of the platform through the opening. Th... | 08/18/2009 |
| 7281608 | Loading/unloading device for shelving The invention relates to a rack serving device (1) with a load-bearing means (4) displaceable in the height direction of a mast (2), the mast (2) being guided by means of bogie assemblies (7, 8) on bottom and top guide tracks and m... | 10/16/2007 |
| 7234685 | Apparatus for raising and lowering a banner An apparatus for raising and lowering an article includes a tube, a motor coupled to the tube for rotating the tube, a plurality of cables secured to the tube and to the article in spaced relation to each other, and a cable indexer synchronously coupled with the tub... | 06/26/2007 |
| 7225901 | Elevator roping system An elevator, preferably an elevator without machine room, in which the hoisting machine (10) engages the hoisting ropes (3) by means of a traction sheave (11), the elevator car (1) being at least partially supported by the hoisting ropes ... | 06/05/2007 |
| 7219770 | Coordinated lift system with user selectable RF channels A coordinated lift system with user selectable RF channels coordinates the raising and lowering of a vehicle relative to a surface by using wireless communications. The lift system includes at least two lift mechanisms each having support frame, including a post, a ... | 05/22/2007 |
| 7213686 | Scissor lift mechanism A scissor lift mechanism (1) having at least two scissor elements (4, 5) connected in pairs by a swivel axis (3). The drive (11) for raising and lowering the scissor elements (4, 5) is provided by a traction member (13). To ... | 05/08/2007 |
| 7117977 | Elevator apparatus including car with suspending pulley devices on opposite sides of the car An elevator apparatus has first and second car suspending pulley devices mounted on a car. First and second counterweight suspending pulley devices are mounted on a counterweight. In the upper portion of the interior of a hoistway, there are arranged a car side retu... | 10/10/2006 |
| 6640934 | Residential cargo lift A cargo lift for transporting goods between ground level and a raised handling position at the side of a building includes a vertical mast extending between ground level and the handling position alongside the building. A cargo container for carrying the ... | 11/04/2003 |
| 6619433 | Elevator system using minimal building space An elevator system includes a hoistway having a vertically adjacent structural platform, i.e., a roof slab or pit slab, that includes a recess, and a machine that fits within the recess. The vertically adjacent structural platform defines either the ceili... | 09/16/2003 |
| 6591945 | Self propelled elevator A self-propelled elevator in which a drum type winding machine is attached to a cage, and the cage is elevated along guide rails arranged in a hoistway by a first winding rope, one end of which is fixed to a top portion of the hoistway and the other end p... | 07/15/2003 |
| 6371247 | Lift assembly A lift assembly includes first and second elevator structures, each including a first scissors section, a second scissors section pivotally connected to the first scissors section and supporting a lift shaft which extends between the first and second stru... | 04/16/2002 |
| 6305499 | Drum drive elevator using flat belt An elevator system (10) includes an elevator car (18) supported for vertical movement on a belt (16) having an end fixed to the hoistway (26) and the other end wound about a drum (32) of a drum drive (12). When the belt (16) is wound or unwound about the ... | 10/23/2001 |
| 6012552 | Grocery lift A grocery lift for lifting and lowering grocery loads. The apparatus includes a pair of spaced apart elongate guide rails with a support chassis interposed between the guide rails. The support chassis is mounted to each of the guide rails to permit riding... | 01/11/2000 |
| 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 |
| 5245940 | Load lifting device A load lifting device for small watercraft has a vertical post having a lower post portion extending downwardly in the water from the top of the dock and rigidly mounted thereto and having an upwardly extending rectilinear extension and a vertically movea... | 09/21/1993 |
| 5149242 | Vertical drive apparatus for storage and retrieval vehicles A novel vertical drive assembly for a storage and retrieval vehicle wherein a cable drive motor is horizontally juxtaposed between a lift cable winding and unwinding drum. The vertical drive assembly is modularly assembled on a frame and is attachable and... | 09/22/1992 |
| 5149241 | Dual mast apparatus for storage and retrieval vehicles A novel dual mast storage and retrieval vehicle comprising structure which maintains each mast essentially vertical as variably weighted heavy loads are placed on a carriage disposed between the masts. Each mast is disposed near the center of a separately... | 09/22/1992 |
| 5116264 | Positionable service bench A mobile positionable service bench 20 comprising of a square U-configured base 22 and a vertical mast structure 56 mounted upright on a square U-configured base 22. A winch 68 mounted on vertical mast structure 56 and a cable 66 connected thereto and to ... | 05/26/1992 |
| 5105914 | Stairlift In a stairlift comprising a guide track, fixed to the steps of the stairs, the guide track does not protrude below the first or second riser at the foot of the stairs and/or beyond the top of the stairs into the landing area. A second track is mounted on ... | 04/21/1992 |
| 5091685 | Method and apparatus for controlling the shuttle of a storage and retrieval machine A shuttle control for a storage and retrieval machine has a supervisory control mounted on the base of the storage and retrieval machine and a shuttle control mounted on the carriage of the storage and retrieval machine. The supervisory control receives s... | 02/25/1992 |
| 4987976 | Telescoping portable lift A manually-operated portable lift which may telescopically raise its mast or post so as to raise a lifting platform above the lift's initial height. The lift may be folded up to a compact and easily-moved configuration for ease of transport and storage. T... | 01/29/1991 |
| 4872800 | Unit goods storage A unit goods storage includes racks (1) a frame-work (2) of which is made up each of vertical masts giving support to stacks of cantilever shelves (3,4) facing each other with their free sides so as to form vertical passages each containing a horizontal c... | 10/10/1989 |
| 4684310 | Wheel manipulator A wheel manipulator for engaging and retaining the hub of a wheel thereto, having a base frame with a vertical column, a carriage slidably mounted on the column and adapted to be vertically adjustably positioned thereon, a turret rotatably mounted on the ... | 08/04/1987 |
| 4619346 | Elevator-type work platform An elevator has a horizontal chassis, a telescopingly extensible and retractable mast having upper and lower ends, a guide extending along the mast between its ends, and a platform adapted to support a worker and displaceable in the guide along the mast b... | 10/28/1986 |
| 4600086 | Elevator hoist apparatus An elevator hoist apparatus of the type disposed in the bottom of a hoistway has an improved structure for securing the apparatus to the wall of the hoistway. The apparatus also comprises an improved hoist drum having multiple parallel rope grooves formed... | 07/15/1986 |
| 4427093 | Locking device An automatic locking device is provided for a telescoping work platform that includes: a base frame, a middle frame and a platform frame, the locking device comprises a first sliding member mounted in the middle frame, a first notch in the base frame for ... | 01/24/1984 |
| 4396094 | Retractable trolley escape capsule A guided lift cage which is pivotally mounted to a pair of fixed side rails by a suspension trolley so that the cage is always suspended on a vertical axis, regardless of the axis of the side rails. The path of the side rails may curve from a vertical axi... | 08/02/1983 |
| 4257493 | Hoisting system A hoisting system for use in elevating personnel or other materials preferably within a mine, or other low level installations, incorporating a capsule which is suspended by a singular cable that is fed out from a winding drum, a tension weight suspended ... | 03/24/1981 |
| 4178032 | Apparatus for synchronously elevating and lowering air-ambulance litter with crash attenuation capability Patient litter apparatus adapted for use in an air-ambulance operable to permit elevating and lowering the litter and patient while maintaining the litter in a horizontal position at all times and with provisions for locking the apparatus with the litter ... | 12/11/1979 |
| 4071115 | Multi-story lift device A multi-story lift device, fixed to a trailer for over-the-road travel to and from a job site, particularly for use in the construction industry and related trades. The trailer mounted lift device is adapted for transportation by automotive vehicles such ... | 01/31/1978 |
| 3951236 | Mountable hoist A hoist having an outer principal channel post and an inner secondary channel member, longitudinally movable therewithin, the secondary channel member being moved by a winch and cable and being adapted to travel longitudinally beyond the upper end of the ... | 04/20/1976 |
