| Patents for B66F 3 - Devices, e.g. jacks, adapted for uninterrupted lifting of loads (6,643) |
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| 12/17/1991 | US5072914 Railway freight car coupler lift |
| 12/17/1991 | US5072648 Control system for a fluid operated jack |
| 12/17/1991 | CA1293176C Hydraulic lifting cylinder-piston unit |
| 12/12/1991 | WO1991019107A1 Control system for a fluid operated jack |
| 12/12/1991 | WO1991018821A1 A jack for levelling a wheeled vehicle |
| 12/11/1991 | CN2090371U Hydraulic jack with dual pumps |
| 12/04/1991 | EP0459847A1 Luminaire and lighting installation for streets. |
| 12/02/1991 | CA2042561A1 Roadway lighting fixture and multiple fixtures lighting installation |
| 11/21/1991 | EP0457021A1 Vehicle jack |
| 11/20/1991 | CN2089000U Anti-electrostatic telescopic trestle for floor |
| 11/14/1991 | DE4015074A1 Locking device for lifting gear - has roller with recess in its periphery which engages matching recess in bar |
| 11/13/1991 | CN2088543U Self-reset hydraulic jack |
| 11/13/1991 | CN2088542U Speed regulating wheel type hydraulic jack |
| 11/12/1991 | US5064171 Drive head for a scissors jack |
| 11/11/1991 | CA2016543A1 Low clearance jacking system |
| 11/07/1991 | DE4112875A1 Lifting arm tilt mechanism - has a moving guide in groove at frame of lifting appts. |
| 11/05/1991 | US5062245 Telescopic beam |
| 10/30/1991 | EP0454510A1 Control circuit for a hydraulic double acting cylinder and spool valve for such a circuit |
| 10/30/1991 | CN2087616U Multi-cylinder synchronous controller for hydraulic elevator |
| 10/16/1991 | EP0451643A2 Vehicle lifting jack |
| 10/09/1991 | EP0449933A1 A screw lift. |
| 10/09/1991 | CN2086252U Gear drive type jack |
| 10/08/1991 | US5054578 Power-operated lift and presenting mechanism |
| 09/30/1991 | CA2038775A1 Vacuum control system for lifting systems |
| 09/25/1991 | CN2085366U Mechanical type stepless lifting device |
| 09/24/1991 | CA1289449C Screw jack safe against overload for a movable element such as a seat structure |
| 09/18/1991 | EP0447384A2 Control device in vacuum hoist means |
| 09/17/1991 | US5048794 Hydraulic lift perfected for the lifting and maneuvering of heavy loads of many tons |
| 09/17/1991 | CA1289050C Telescopic screw jack for the adjustment of an element such as a vehicle seat |
| 09/11/1991 | EP0446115A1 Multiple actuator, supply circuit for such an actuator and telescopic boom as an application of this actuator |
| 09/08/1991 | CA2011717A1 Safety jacking assembly |
| 09/03/1991 | US5044868 Valve system for controlling a vacuum lifting apparatus |
| 09/03/1991 | US5044864 Lift for a slot machine stand |
| 08/28/1991 | EP0443383A1 Jack |
| 08/28/1991 | CN2083580U Twe-stage hydraulic jack |
| 08/22/1991 | DE4005447A1 Car jack with pivoted foot - incorporates pivoted support piece at top to relieve jack of tipping moments |
| 08/22/1991 | CA2036849A1 Lifting jack |
| 08/20/1991 | US5040758 Level adjustment device, particularly for furniture |
| 08/14/1991 | DE4040295A1 Fluid actuated lifting cylinder - has compressed air operated cushion located between two interconnected plates which are relatively parallel in quiescent condition |
| 08/13/1991 | US5039274 Vacuum lifting apparatus |
| 08/13/1991 | US5039070 Roll up jack stand |
| 08/07/1991 | EP0440349A1 Hydraulically operated dockboard |
| 08/07/1991 | EP0440348A1 Vehicle jack |
| 08/06/1991 | CA1287342C Hydraulic jack with a system for checking the position of the piston |
| 07/30/1991 | US5035456 Vacuum control system for lifting systems |
| 07/30/1991 | US5035120 Freezer |
| 07/30/1991 | CA1287040C Differential hydraulic jack with damping system for the control of electric circuit-breakers |
| 07/24/1991 | CN2081454U Full-stroke fast distance-adjustable mechanism |
| 07/17/1991 | CN1053042A Expandable sealing ring |
| 07/16/1991 | US5031504 Hydraulic jack with a system for checking the position of the piston |
| 07/09/1991 | US5029814 Scissor jack stand |
| 07/04/1991 | DE3943370A1 Pneumatic wt. balancer with control block - maintains base pressure dependent on applied wt. as control pressure for automatic wt. control |
| 06/19/1991 | CN2079179U Jack with telescopic sleeves |
| 06/04/1991 | US5020777 High lift jack |
| 05/29/1991 | CN2077862U 螺旋千斤顶 Jackscrew |
| 05/07/1991 | US5012879 Self-propelled jacking apparatus for factory constructed buildings |
| 05/01/1991 | CN2076093U Automatic self-locking safety mechanism for hydraulic jack |
| 05/01/1991 | CN2076092U Sliding hydraulic jack capable of lifting vertically |
| 04/30/1991 | US5011118 Jack |
| 04/25/1991 | DE3934922A1 Hoist with suction box and suction connecting union - has vacuum pump actuated by radio control circuit as switch |
| 04/23/1991 | US5009394 Metal fence post extractor |
| 04/18/1991 | DE3933759A1 Pneumatic hoist with precise load positioning - has linear motion transferred to shaft with fail=safe brake and pneumatic sensing valves |
| 04/10/1991 | EP0421470A2 A pressure tube-piston device |
| 04/09/1991 | US5005812 Pneumatic bearing jack and adaptors |
| 04/02/1991 | CA1282404C Motor vehicle lift |
| 03/26/1991 | US5002258 Jack and components therefor |
| 03/19/1991 | US5000424 Vehicle jack |
| 03/13/1991 | EP0416057A1 Mechanical device for moving heavy objects |
| 03/13/1991 | CN2072965U Double thread jack |
| 03/06/1991 | EP0414850A1 Vehicle jack. |
| 02/27/1991 | CN2072079U Hydraulic jack with self-adjusting bearing corner |
| 02/06/1991 | EP0411128A1 Lifting jack |
| 01/23/1991 | EP0409544A1 Belt-like bag bodies |
| 01/23/1991 | CN2069850U High-efficient mechanical jack |
| 01/22/1991 | CA1279309C Jack assembly for railroad cars |
| 01/16/1991 | EP0407740A1 Vehicle jack |
| 01/16/1991 | CN2069407U Pallet applicable to hydraulic jack |
| 01/09/1991 | EP0407318A1 Hydraulic jack |
| 01/08/1991 | US4982930 Sidewalk lifter |
| 01/02/1991 | CN2068499U Architectural elevating helical pipe supporting head |
| 12/27/1990 | EP0404006A1 Rack and pinion lifter |
| 12/25/1990 | US4979723 Fluid powered wheel lift platform |
| 12/19/1990 | CN2067703U Continuous oil supply device for hydraulic jack |
| 12/19/1990 | CN2067702U Multifunctional hand-operated hydraulic jack |
| 12/19/1990 | CN2067701U Jack |
| 12/18/1990 | US4978104 Quick release jack |
| 12/12/1990 | EP0401412A1 Lifting device for a cable drum |
| 12/11/1990 | US4976413 For a vehicle or another heavy load |
| 12/11/1990 | CA1277629C Power-operated lift and presenting mechanism |
| 11/28/1990 | EP0399884A1 Plate freezer |
| 11/28/1990 | EP0290584B1 Lifting devices for containers |
| 11/28/1990 | CN1047263A Universal hydraulic jack with flexible cylinder |
| 11/20/1990 | US4971292 Hoist apparatus |
| 11/14/1990 | EP0396907A1 A positioning device |
| 11/14/1990 | CN2065614U Piston pneumatic lift |
| 11/07/1990 | EP0396233A1 Vehicle jack |
| 10/31/1990 | CN2064765U Safety device for jack |
| 10/31/1990 | CN2064764U Multifunctional hydraulic jack |
| 10/31/1990 | CN2064763U Stepless lift |
| 10/31/1990 | CN1010243B Differential hydraulic jack with damping system for control of electric circuit-breakers |