GB837017A - Improvements in or relating to hydraulic lifting apparatus - Google Patents
Improvements in or relating to hydraulic lifting apparatusInfo
- Publication number
- GB837017A GB837017A GB263757A GB263757A GB837017A GB 837017 A GB837017 A GB 837017A GB 263757 A GB263757 A GB 263757A GB 263757 A GB263757 A GB 263757A GB 837017 A GB837017 A GB 837017A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- housing
- pump
- intake pipe
- block
- 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)
- Reciprocating Pumps (AREA)
Abstract
837,017. Hydraulic lifting jacks. WEBER, E. Jan. 24, 1957, No. 2637/57. Class 78 (3). An hydraulic jack in which a lifting cylinder 3 moves over a fixed piston 4 is operated by a pump 2 mounted in the upper part of a housing 1 secured to the cylinder 3. The housing surrounds the cylinder, with some clearance, at its lower end and engages the load through an upper surface 37 and a surface 70 mounted on the outside wall. In the form shown the housing 1 is of square section and is attached to the cylinder 3 by a block 12 supporting the pump 2 which is operated by a hand lever attached to a shaft 25. The pump draws fluid from the space between the cylinder 3 and the housing 1, and feeds it under pressure into the cylinder 3. A manually operated discharge valve 19 for lowering the jack and a pressure relief valve are provided. The latter may take the form shown diagrammatically in Fig. 8, where the slide 80 moves to the right as pressure builds up in the lifting cylinder passage 59<SP>1</SP>, until a reduced centre portion 80<SP>1</SP> allows fluid to escape from the pump cylinder 21<SP>1</SP> to the intake passage 51<SP>1</SP>. The jack may be made invertible by providing a second intake pipe above the block 12, which does not completely fill the cross-section of the housing 1, and a rotating or sliding valve to select the appropriate intake pipe. Alternatively the intake pipe may be flexible and have its end weighted down, the gap in the block 12 being sufficiently large to allow the weighted end to pass through. The pump may have two cylinders, one of which may be larger than the other, and one of which may be adapted to become inoperative when a certain fluid pressure is exceeded.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB263757A GB837017A (en) | 1957-01-24 | 1957-01-24 | Improvements in or relating to hydraulic lifting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB263757A GB837017A (en) | 1957-01-24 | 1957-01-24 | Improvements in or relating to hydraulic lifting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB837017A true GB837017A (en) | 1960-06-09 |
Family
ID=9743068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB263757A Expired GB837017A (en) | 1957-01-24 | 1957-01-24 | Improvements in or relating to hydraulic lifting apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB837017A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104944049A (en) * | 2015-06-29 | 2015-09-30 | 常熟通润汽车修理设备有限公司 | Hydraulic vertical type conveying device provided with improved pressure oil releasing mechanism |
-
1957
- 1957-01-24 GB GB263757A patent/GB837017A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104944049A (en) * | 2015-06-29 | 2015-09-30 | 常熟通润汽车修理设备有限公司 | Hydraulic vertical type conveying device provided with improved pressure oil releasing mechanism |
CN104944049B (en) * | 2015-06-29 | 2017-01-25 | 常熟通润汽车修理设备有限公司 | Hydraulic vertical type conveying device provided with improved pressure oil releasing mechanism |
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