| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 41 | Remote control apparatus for hydraulic systems | US51780744 | 1944-01-11 | US2425071A | 1947-08-05 | PAGE HERBERT E |
| 42 | Ratio changing fluid pressure system | US46866042 | 1942-12-11 | US2381004A | 1945-08-07 | STEVE SCHNELL |
| 43 | Fluid pressure compounding system | US49323543 | 1943-07-02 | US2361878A | 1944-10-31 | STEVE SCHNELL |
| 44 | Hydraulic jack. | US1909530031 | 1909-11-26 | US1149279A | 1915-08-10 | NELSON JAMES W |
| 45 | Drill. | US1913792557 | 1913-09-30 | US1098690A | 1914-06-02 | SHERWOOD MATHER W |
| 46 | Hydraulic jack. | US1906341395 | 1906-10-31 | US867997A | 1907-10-15 | MATHERS WILLIAM H |
| 47 | MULTI-SPEED HYDRAULIC JACK | US12990216 | 2009-04-28 | US20120006014A1 | 2012-01-12 | George W. Jackson; David G. Jackson |
| A multi-speed jack, having a pump assembly including a pump block having a first cylinder and a second cylinder defined therein, a piston assembly movable within the pump block, the piston assembly having a first portion configured to sealably engage with the first cylinder and a second portion configured to sealably engage with the second cylinder, a reservoir for storing hydraulic fluid and coupled to the pump block so that when the piston assembly is moved in a first direction, hydraulic fluid in the reservoir is supplied to the first cylinder and the second cylinder, a lifting assembly having a ram chamber and a ram rod, the ram chamber coupled to the pump assembly and configured to receive fluid from the first cylinder and the second cylinder when the piston assembly is moved in a second direction so as to raise the ram rod and a bypass check valve provided in the first cylinder. The bypass check valve is configured so that when the piston assembly is moving in the second direction and the pressure in the first cylinder exceeds a threshold pressure, the hydraulic fluid in the first cylinder returns to the reservoir. The second cylinder may be much smaller to provide leverage to move a far greater load though at a much slower rate. | ||||||
| 48 | Multilevel speed regulation jack | US10755852 | 2004-01-12 | US07040091B2 | 2006-05-09 | Qun Fan |
| A multilevel speed regulation jack includes an input oil cylinder, an output oil cylinder, and a fluid conduit member between the cylinders. The output oil cylinder includes a cylinder body containing an annular space and a tube piston, which fits in the annular space. A sliding sleeve of the tube piston is movably positioned in the annular space. An annular in-flow oil chamber is formed between the end annular surface of the tube piston and the cylinder body, and a central in-flow oil chamber is formed between the inner central surface of the piston and the cylinder body. The fluid conduit member includes at least two parallel fluid channels connected to the central in-flow oil chamber and the annular in-flow oil chamber, respectively. A control valve in one of the fluid channels opens/closes the channel. The jack can automatically switch between different jacking speeds based on the load sensed by the system and therefore has a high jacking efficiency. | ||||||
| 49 | Drive device for a movable part, especially a mold closure device for an injection molding machine, and method for operating such a drive device | US10152311 | 2002-05-20 | US06817859B2 | 2004-11-16 | Jörg Dantlgraber |
| A drive for a movable part, such as a mold closure platen, includes two hydraulic cylinder-and-piston units defining first and third pressure chambers in a first of the hydraulic units and defining fourth and fifth pressure chambers in a second of the hydraulic units, and wherein the piston of one of the hydraulic units is a stepped piston defining a second pressure chamber, thereby providing five pressure chambers. An arrangement of valves provides for selective coupling of hydraulic fluid among the pressure chambers whereby pressure medium is forced from one of the hydraulic units, during an advance of its piton, to the other of the hydraulic units. | ||||||
| 50 | Hydraulic raising apparatus with automatic regulated speeds | US09394917 | 1999-09-13 | US06247307B1 | 2001-06-19 | Michael Hung |
| A hydraulic raising apparatus with automatic regulated speeds can automatically adapt its raising speeds for various load conditions. It mainly comprises additional hydraulic circuits, check valves and adjustable relief valves arranged between the piston rod side chamber and the rodless side chamber of hydraulic cylinders and pumps. The arrangement enables hydraulic cylinders and pumps to change their working modes in a hydraulic circuit, depending on loaded conditions, from a piston type to a spool type and vice versa. Hence the hydraulic apparatus can adjust its raising speeds in agreement with loads. When the apparatus bears a light load, it will quickly carry the load to position. On the other hand, when the load is heavy the apparatus will move it at a slower speed and thus need just reduced input energy. Therefore, the apparatus according to the invention can enhance efficiency to the greatest extent. | ||||||
| 51 | Hydraulic jack device | US09426209 | 1999-10-25 | US06240726B1 | 2001-06-05 | Lai-Shun Lin |
| A hydraulic jack device has a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat. A hydraulic shaft is inserted through the hydraulic cylinder and connected to the rocking arm. The rocking arm is connected to the lifting seat. The pump has a main body connected to the hydraulic cylinder, a chamber formed in the main body, a piston cylinder, a piston, and a C-shaped ring. The driven rod has a round end and a hollow box end. The driven rod passes through the piston cylinder, a coiled spring, and the piston. The round end of the driven rod is inserted in the chamber. A first and a second oil channels are formed in the hydraulic cylinder. | ||||||
| 52 | Apply-rate-independent fast-fill master cylinder | US447360 | 1995-05-23 | US5557935A | 1996-09-24 | Blaise J. Ganzel |
| A master cylinder having, in addition to a main pressurizing chamber, a fast-fill pressurizing chamber to quickly force, while pedal effort is minimal, brake pads or shoes from initially retracted positions to positions where the pads or shoes are in contact with corresponding brake disks or drums. The present master cylinder uses no fixed brake fluid flow restriction valves to vent brake fluid from the fast-fill pressurizing chamber once contact is made, pedal travel being made thereby independent of the rate of applied pedal effort. The present master cylinder uses a staged inverse proportioning valve, disposed between the fast-fill reservoir main pressurizing chambers, and simultaneously responsive to brake fluid pressures of both the fast-fill and the main pressurizing chambers to vent brake fluid from the fast-fill pressurizing chamber into a brake fluid reservoir as pedal effort begins to increase, thereby moderating the rate of increase of pedal effort so that a minimum of inconsistency in that effort is detectable when the transition from quick take-up to normal master cylinder operation is made. | ||||||
| 53 | Hydraulic pressure-multipliers | US9811361 | 1961-03-24 | US3057163A | 1962-10-09 | HENRY ALPING GUSTAV |
| 54 | Assister unit for hydraulic control system | US62284956 | 1956-11-19 | US2941366A | 1960-06-21 | PORTER GILBERT E |
| 55 | Compound hydraulic brake compressor and the like | US49228143 | 1943-06-25 | US2407957A | 1946-09-17 | ARTHUR HULL-RYDE |
| 56 | Fluid pressure control device | US45826442 | 1942-09-14 | US2366119A | 1944-12-26 | MAJNERI LUDWIG A |
| 57 | Pump for hydraulic systems | US35585229 | 1929-04-17 | US1921008A | 1933-08-08 | SHINN BYRON H |
| 58 | Hydraulic jack. | US1913787556 | 1913-09-02 | US1152829A | 1915-09-07 | MESSINGER WILLIAM |
| 59 | Hydraulic jack. | US1914861325 | 1914-09-11 | US1136830A | 1915-04-20 | NELSON JAMES W; MATHERS WILLIAM H |
| 60 | Hydraulic jack. | US1910570665 | 1910-07-06 | US1016692A | 1912-02-06 | JOYCE FRANK I |
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