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| Number | Title | Issue Date |
| 7946391 | Hydraulic elevator without machine room A hydraulic elevator for an elevator shaft having guide rails for an elevator cab. The hydraulic elevator has no machine room and includes an assembly disposed between the guide rails and a tank, a pump mounted in the tank, a motor mounted in the tank for driving th... | 05/24/2011 |
| 7354511 | Hydraulic unit for industrial trucks A hydraulic unit for industrial trucks, comprising a motor pump unit which is directly attached to a tank, a reflux filter which has an elongate filter casing for a filtering element adapted to be introduced into the tank through an opening, a hose coupling, and an ... | 04/08/2008 |
| 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 |
| 7134528 | Hydraulic elevator with valve for preventing discharge of pressure accumulator and method of controlling same A hydraulic elevator with a pressure accumulator includes a pump fir conveying hydraulic oil between the pressure accumulator and a hydraulic drive, such that the direction of rotation of the pump can be changed. An electrically controlled cylinder line stop valve i... | 11/14/2006 |
| 7117979 | Method for preventing an inadmissibly high speed of the load receiving means of an elevator A method for preventing an inadmissibly high speed of a load receiving unit of an elevator, including the steps of supplying information about an actual position and an actual speed of the load receiving unit in an area of an entire travel way of the load receiving ... | 10/10/2006 |
| 6996937 | Potential energy storage system The present invention relates to a system for generating electrical power using hydraulic supports on which a building structure is mounted. A pump injects fluid into the supports to raise the building structure and thereby store energy in the elevated structure. A ... | 02/14/2006 |
| 6978608 | Hydraulic unit What is disclosed is a hydraulic unit for a plastics processing machine, in particular a hydraulically actuated injection molding machine. In accordance with the invention, the drive mechanism of a pump of a hydraulic circuit is provided inside the tank to ensure op... | 12/27/2005 |
| 6971481 | Hydraulic elevator with motor controlled hydraulic drive and method for controlling the hydraulic elevator The invention relates to a hydraulic lift comprising a pressure accumulator (17). Hydraulic fluid can be transported between the pressure accumulator (17) and a hydraulic drive (2) by means of a pump (13), the rotational direction of the ... | 12/06/2005 |
| 6964322 | Method and apparatus for synchronizing a vehicle lift A vehicle lift control maintains multiple points of a lift system within the same horizontal plane during vertical movement of the lift engagement structure by synchronizing the movement thereof. A vertical trajectory is compared to actual positions to generate a ra... | 11/15/2005 |
| 6957721 | Hydraulic elevator with an accumulator A pump is situated between the hydraulic drive and the accumulator, this pump being driven by a motor and conveying hydraulic oil from the hydraulic drive to the accumulator and vice versa without the presence of control valves which influence the flow of hydraulic ... | 10/25/2005 |
| 6942067 | Portable emergency drive for an elevator An emergency drive is a toothed element such as a gear rim, is arranged on a traction sheave of an elevator drive. During emergency operation, the gear rim is driven by means of a pinion of an auxiliary engine. The engine is installed on the elevator drive only duri... | 09/13/2005 |
| 6742629 | Valve control unit for a hydraulic elevator A control valve unit for a hydraulic elevator includes two control valves wherein the flow of hydraulic oil from a tank to a lifting cylinder driving an elevator cabin and/or from the lifting cylinder to the tank can be controlled. In case of an upward movement of t... | 06/01/2004 |
| 6510923 | Control method and apparatus for a hydraulic elevator using only load pressure data A method for controlling a hydraulic elevator whose car can be displaced by a hydraulic drive mechanism by hydraulic oil fed through a cylinder line or evacuated from said hydraulic drive mechanism by a pump that cooperates with a first control valve unit... | 01/28/2003 |
| 6505711 | Hydraulic elevator, comprising a pressure accumulator which acts as a counterweight and a method for controlling and regulating an elevator of this type A hydraulic elevator with a pressure accumulator acting as a counterweight, includes a first pump for conveying hydraulic oil through a pump line, at least one valve unit, and a cylinder line to and from a hydraulic drive for a car, a second pump for conv... | 01/14/2003 |
| 6371005 | Hydraulic power unit for an elevator drive A vertically oriented hydraulic power unit for an elevator drive includes an outer tank for drive fluid and an inner tank for fluid used to submerge and cool a motor, the fluids being exchangeable to maintain temperature in the inner tank at or below a sp... | 04/16/2002 |
| 6279686 | Attachment for flood and yarn trucks with a lift mast, especially for fork lift trucks Attachments for floor and yard trucks with a lift mast, especially for fork lift trucks, have a lift carriage (8) which has two side plates (9, 10) and two horizontal beams (12/14, 13) situated one over the other with a clearance ("h") between them, on wh... | 08/28/2001 |
| 6241049 | Apparatus for storing vehicles with multiple support platforms, collapsible supports between platforms, and a torque-reaction arm lift system An apparatus is provided for storing vehicles. A vertical support structure is mechanically coupled to a horizontal support structure. Multiple support platforms are provided, including at least an upper vehicle support platform and a lower vehicle suppor... | 06/05/2001 |
| 6125970 | Hydraulic device for forklift A hydraulic device for a forklift is disclosed. The forklift includes a tilting mast and a fork supported by the mast so that the fork is lifted and lowered. A tilt cylinder operates to tilt the mast by means of oil supplied by a tilt valve. A restricting... | 10/03/2000 |
| 5969302 | Lift control mechanism and method A lift attached to a truck has a tail gate supported by at least one hydraulic lift and at least one tilt cylinder for respectively lifting the tail gate as a whole and rotating it for opening and closing. A control system for moving such a tail gate up a... | 10/19/1999 |
| 5900596 | Hydraulic brake controller This invention includes a brake system for a hydraulic ram or another cylinder, that can be employed as an emergency brake for a lifting elevator. When actuated, the brake arms contact the ram circumferentially to slow and stop the falling ram. The brake ... | 05/04/1999 |
| 5864101 | Lift control mechanism and method A lift attached to a truck has a tail gate supported by at least one hydraulic lift and at least one tilt cylinder for respectively lifting the tail gate as a whole and rotating it for opening and closing. A control system for moving such a tail gate up a... | 01/26/1999 |
| 5635689 | Acceleration damping of elevator resonant modes and hydraulic elevator pump leakage compensation A speed command signal is applied to a variable voltage, variable frequency controller for driving a three-phase induction motor that operates a positive displacement pump for supplying fluid to a hydraulic elevator drive cylinder. An accelerometer mounte... | 06/03/1997 |
| 5612517 | Process and apparatus for controlling a hydraulic lift Process and apparatus for controlling a hydraulic lift wherein with this process, a direct approach to a floor can be achieved without requiring a creeping velocity drive, whereby the car is controlled in a position-dependent manner during the deceleratio... | 03/18/1997 |
| 5597987 | Twin post, telescoping jack hydraulic elevator system A twin post, telescoping jack hydraulic elevator system has a pair of dynamic sensors to determine when the jacks are out of synchronization, by determining any relative differences in height between the two intermediate cylinders. The elevator also inclu... | 01/28/1997 |
| 5583326 | Pneumatic elevator by depressure Pneumatic vacuum lift elevator, in which the vertical shaft is a tube with smooth interior surface, preferably cylindrical, with straight axle, and the transport cab or vehicle moving inside such tube is a piston with vertical movement, with minimum play ... | 12/10/1996 |
| 5579870 | Water-driven robots Water driven robots are provided which can be used for moving different objects at different controlled directions and frequencies to obtain energy and power from the flow of a liquid, such as water. A container (10) contains a siphonic outlet which is ca... | 12/03/1996 |
| 5447211 | Pneumatic elevator by depressure Pneumatic vacuum lift elevator, in which the vertical shaft is a tube with smooth interior surface, preferably cylindrical, with straight axle, and the transport cab or vehicle moving inside such tube is a piston with vertical movement, with minimum play ... | 09/05/1995 |
| 5373915 | Passenger lift with an electric safety interlock A passenger lift incorporates an electronic safety interlock to prevent all movement of the lift, until a restraining belt is fastened. In some embodiments, the interlock is a normally open electric switch located inside the restraining belt's buckle. The... | 12/20/1994 |
| 5349142 | Energy conservation type hydraulic elevator and speed control method of hydraulic elevator In the energy conservation type hydraulic elevator, a load carrying elevator and a balancing elevator are each provided on a respective hydraulic cylinder. The hydraulic cylinders are connected to one another by a fluid circuit. The balancing elevator is ... | 09/20/1994 |
| 5266756 | Control apparatus for hydraulic elevators using fuzzy logic and speed control A control apparatus for hydraulic elevators, including: a flow control valve for controlling the amount of oil in a hydraulic jack; a sensor device for detecting at least one of oil temperature and load pressure and producing corresponding input data; a c... | 11/30/1993 |
| 5228537 | Safety mechanism for a vertical reciprocating conveyor A vertical reciprocating conveyor having a safety mechanism for automatically locking the conveyor at an elevated level. The conveyor comprises a cargo-supporting carriage which is guided for movement between a lower level and an upper level on a supporti... | 07/20/1993 |
| 5131507 | Hydraulic elevator control apparatus using VVVF to determine the electric drive motor rotational speed A hydraulic elevator control apparatus comprises an induction motor for driving a hydraulic pump which sends and receives a fluid, an inverter circuit for determining the number of rotations of the induction motor using variable-voltage variable-frequency... | 07/21/1992 |
| 5099957 | Procedure and apparatus for controlling a hydraulic elevator during approach to a landing A procedure and apparatus for controlling a hydraulic elevator during approach to a landing are disclosed, in which the speed of the elevator and the temperature of the hydraulic fluid are measured prior to beginning deceleration of the elevator. The dece... | 03/31/1992 |
| 5078236 | Power unit for hydraulic elevator A hydraulic elevator power unit has an oiltight type detector for detecting the number of revolutions of an electric motor. A leak oil hole formed in a lower end portion of the detector is connected to a leak oil tank. The operating oil entering the detec... | 01/07/1992 |
| 5065844 | Hydraulic platform and level correcting control system A hydraulic platform and level correcting system used for a wide variety of lifting applications that require a steady, level lift in order to avoid damage to the lift and/or an object being lifted. The hydraulic platform is controlled by an electrohydrau... | 11/19/1991 |
| 5060762 | Pressure intensifier for repositioning telescopic plungers in synchronized telescopic cylinders The hydraulic elevator system includes a synchronized telescoping cylinder with inner and outer reciprocating plungers mounted in a fixed cylinder. An hydraulic fluid pressure intensifier is connected to the pressure chamber for the outer plunger, and to ... | 10/29/1991 |
| 5038894 | Drive control apparatus A drive control apparatus includes a magnetic field in which a magnetic field gradient is provided by applying a magnetic field to the magnetic fluid to produce an apparent specific gravity gradient in accordance with the magnetic field gradient. A contro... | 08/13/1991 |
| 5014824 | Hydraulic elevator control valve The flow of hydraulic fluid to and from an hydraulic elevator piston is controlled by a motor-actuated spool valve operated by a microprocessor. To lower the elevator, a main check valve is opened by a down piston using hydraulic fluid from the system. Pr... | 05/14/1991 |
| 4976338 | Leveling control system for hydraulic elevator A hydraulic elevator includes level sensors for establishing dead zones of different sizes and for changing the dead zone while the car is stopped at a floor. A controller selects the size of the dead zone, for purposes of relevel operations, based upon e... | 12/11/1990 |
| 4962832 | Vehicle lift with lift limit control An hydraulically operated vehicle lift having an electro-hydraulic power unit mounted on one of the lift columns for supplying fluid to the hydraulic actuator for raising the lift carriages. The electro-hydraulic power unit has an electrical junction box ... | 10/16/1990 |
