GB643462A - Improvements in and relating to two-speed rams for hydraulic machinery - Google Patents
Improvements in and relating to two-speed rams for hydraulic machineryInfo
- Publication number
- GB643462A GB643462A GB405647A GB405647A GB643462A GB 643462 A GB643462 A GB 643462A GB 405647 A GB405647 A GB 405647A GB 405647 A GB405647 A GB 405647A GB 643462 A GB643462 A GB 643462A
- Authority
- GB
- United Kingdom
- Prior art keywords
- duct
- oil
- valve
- space
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Abstract
643,462. Hydraulic jacks. SKYHI, Ltd., and STEAD, A. H. Feb. 12, 1947, No. 4056. [Class 78 (iii)] A quick lifting device for the piston of a hydraulic jack comprises a small bore quick lift cylinder 6 located concentrically in the large bore of the hollow piston - rod 4, and a tubular guide 5 for this cylinder secured in the base of the jack. The piston 4a, together with the cylinder 6, quickly slides up the guide 5 when oil is pumped by a hand pump 8 through valve 8i, duct 1b and housing 7 to the interior of the guide 5, and the reduced pressure in the space 3a behind the piston 4a causes pre-filling valve 10 to open and admit oil from the reservoir 2 through duct 1e and aperture 7e. When the head 4h engages the load the space 3a is filled with oil which, under the pressure produced by the load closes valve 10 and thereafter oil is delivered to the space 3a by the pump 8 through duct 1b, housing 7 and non-return valve 11 until the load has been lifted to the required height. To lower the jack a release valve 9, connected to the reservoir through a duct (not shown) and to the duct 1b by a duct 1c is opened, the pressure in the cylinder 6 falls, after which the high pressure oil in the space 3a lifts the escape valve 12 and allows the oil to return to the reservoir via housing 7, ducts 1b, 1c and release valve 9.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB405647A GB643462A (en) | 1947-02-12 | 1947-02-12 | Improvements in and relating to two-speed rams for hydraulic machinery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB405647A GB643462A (en) | 1947-02-12 | 1947-02-12 | Improvements in and relating to two-speed rams for hydraulic machinery |
Publications (1)
Publication Number | Publication Date |
---|---|
GB643462A true GB643462A (en) | 1950-09-20 |
Family
ID=9769887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB405647A Expired GB643462A (en) | 1947-02-12 | 1947-02-12 | Improvements in and relating to two-speed rams for hydraulic machinery |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB643462A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1084003B (en) * | 1956-08-16 | 1960-06-23 | Wilhelm Koenig Jun | Hydraulic jack |
DE1259542B (en) * | 1965-12-30 | 1968-01-25 | Weber Emil | Hydraulic lifting device, preferably for raising and lowering frames or the like. |
DE3910583A1 (en) * | 1989-04-01 | 1990-10-04 | Weber Oelhydraulik | Hydraulic lifting unit for a lifting appliance |
US6035635A (en) * | 1998-09-03 | 2000-03-14 | Hung; Michael | Hydraulic quick lifting unit of a jack |
WO2005007555A1 (en) * | 2003-07-21 | 2005-01-27 | Priborsky Dusan | Hydraulic jack |
CN103072920A (en) * | 2013-01-05 | 2013-05-01 | 常熟通润汽车零部件股份有限公司 | Oil pressure elevation device for carrying and transporting vehicle parts |
-
1947
- 1947-02-12 GB GB405647A patent/GB643462A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1084003B (en) * | 1956-08-16 | 1960-06-23 | Wilhelm Koenig Jun | Hydraulic jack |
DE1259542B (en) * | 1965-12-30 | 1968-01-25 | Weber Emil | Hydraulic lifting device, preferably for raising and lowering frames or the like. |
DE3910583A1 (en) * | 1989-04-01 | 1990-10-04 | Weber Oelhydraulik | Hydraulic lifting unit for a lifting appliance |
US6035635A (en) * | 1998-09-03 | 2000-03-14 | Hung; Michael | Hydraulic quick lifting unit of a jack |
WO2005007555A1 (en) * | 2003-07-21 | 2005-01-27 | Priborsky Dusan | Hydraulic jack |
CN103072920A (en) * | 2013-01-05 | 2013-05-01 | 常熟通润汽车零部件股份有限公司 | Oil pressure elevation device for carrying and transporting vehicle parts |
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