GB1449020A - Multistage hydraulic telescopic lifting jack - Google Patents
Multistage hydraulic telescopic lifting jackInfo
- Publication number
- GB1449020A GB1449020A GB4782473A GB4782473A GB1449020A GB 1449020 A GB1449020 A GB 1449020A GB 4782473 A GB4782473 A GB 4782473A GB 4782473 A GB4782473 A GB 4782473A GB 1449020 A GB1449020 A GB 1449020A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- piston
- port
- fluid
- annular chamber
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
-
- 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
- B66F3/26—Adaptations or arrangements of pistons
- B66F3/28—Adaptations or arrangements of pistons telescopic
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Actuator (AREA)
Abstract
1449020 Telescopic jacks MONTANHYDRAULIK GmbH & Co KG 12 Oct 1973 [2 Nov 1972] 47824/73 Heading F1D A telescopic jack comprises a cylinder 11, a piston 121 slidable in the cylinder 11 and carrying a cylinder 12, a piston 131 slidable in the cylinder 12 and carrying a cylinder 13, and ports 116', 118' in the wall of the cylinder 11 for co-operation with passages 123, 124 in the piston 121 in a manner which causes extension of the cylinder 12 followed by extension of the cylinder 13. To extend the jack, the cylinder 11 is pressurized through an inlet 113' and a non-return valve 114. Pressurization of the cylinder 11 extends the cylinder 12, fluid in the annular chamber 112 behind the piston 121 flowing to exhaust through the port 116' and a line 116. At the end of the stroke of the cylinder 12, fluid in the cylinder 11 flows into the cylinder 12 via the port 118' and the passage 123 now aligned therewith. This causes the cylinder 13 to extend, fluid in the annular chamber 122' behind the piston 131 flowing to the exhaust line 116 via a port 133 in the cylinder 13, a tube 124' fixed to the piston 121, the passage 124, and the port 116'. Retraction is effected by reversing the lines 113, 116 whereby pressure in a control line 117 opens the valve 114. Initially pressure in passages 124, 124' retracts the cylinder 13 until the piston 131 uncovers a port 126, thereafter the annular chamber 112' is pressurized first via the port 126 and subsequently directly from the port 116', whereby the cylinder 12 retracts.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19722253646 DE2253646C3 (en) | 1972-11-02 | 1972-11-02 | Multi-stage hydraulic telescopic cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1449020A true GB1449020A (en) | 1976-09-08 |
Family
ID=5860657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4782473A Expired GB1449020A (en) | 1972-11-02 | 1973-10-12 | Multistage hydraulic telescopic lifting jack |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5411063B2 (en) |
DE (1) | DE2253646C3 (en) |
FR (1) | FR2205635B1 (en) |
GB (1) | GB1449020A (en) |
IT (1) | IT999126B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3823225A1 (en) * | 1988-07-08 | 1990-01-11 | Montan Hydraulik Gmbh & Co Kg | Multi-stage hydraulic telescopic cylinder with positive control for the extension and retraction sequence of the telescopic members |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2641216C2 (en) * | 1976-09-14 | 1982-09-02 | Montan - Hydraulik GmbH & Co KG, 4755 Holzwickede | Multi-stage hydraulic telescopic cylinder |
DE2719848C2 (en) * | 1977-05-04 | 1985-09-26 | Montanhydraulik Gmbh & Co Kg, 4755 Holzwickede | Multi-stage hydraulic telescopic cylinder |
ZA804072B (en) * | 1979-08-07 | 1981-06-24 | Dobson Park Ind | Telescoping jack |
DE3021633A1 (en) * | 1980-06-09 | 1981-12-17 | Schütt, Friedrich, 4755 Holzwickede | Multistage telescopic hydraulic ram - has control members in crowns of individual hollow pistons |
DE3339851C1 (en) * | 1983-11-04 | 1985-04-04 | Montan-Hydraulik GmbH, 4755 Holzwickede | Multi-stage hydraulic telescopic cylinder |
-
1972
- 1972-11-02 DE DE19722253646 patent/DE2253646C3/en not_active Expired
-
1973
- 1973-10-12 GB GB4782473A patent/GB1449020A/en not_active Expired
- 1973-10-31 JP JP12186073A patent/JPS5411063B2/ja not_active Expired
- 1973-10-31 IT IT3079173A patent/IT999126B/en active
- 1973-11-02 FR FR7339034A patent/FR2205635B1/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3823225A1 (en) * | 1988-07-08 | 1990-01-11 | Montan Hydraulik Gmbh & Co Kg | Multi-stage hydraulic telescopic cylinder with positive control for the extension and retraction sequence of the telescopic members |
Also Published As
Publication number | Publication date |
---|---|
JPS4976256A (en) | 1974-07-23 |
DE2253646B2 (en) | 1974-11-28 |
JPS5411063B2 (en) | 1979-05-11 |
FR2205635B1 (en) | 1978-02-24 |
DE2253646A1 (en) | 1974-05-22 |
IT999126B (en) | 1976-02-20 |
DE2253646C3 (en) | 1980-08-21 |
FR2205635A1 (en) | 1974-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |