GB669929A - Improvements relating to hydraulic lifting rams - Google Patents
Improvements relating to hydraulic lifting ramsInfo
- Publication number
- GB669929A GB669929A GB1986749A GB1986749A GB669929A GB 669929 A GB669929 A GB 669929A GB 1986749 A GB1986749 A GB 1986749A GB 1986749 A GB1986749 A GB 1986749A GB 669929 A GB669929 A GB 669929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- disc
- hydraulic lifting
- fluid
- normally held
- 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
- B66F3/30—Constructional features with positive brakes or locks
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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)
- Finger-Pressure Massage (AREA)
- Fluid-Damping Devices (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
669,929. Hydraulic lifting machines. PEARSON, D. A. Oct. 11, 1950 [July 28, 1949], No. 19867/49. Class 69 (ii). [Also in Group XXXII] In a hydraulic lifting mechanism a valve g allowing. the free flow of fluid from the ram at normal speeds but controlling the speed of descent has an auxiliary control disc q with a small aperture r normally held away from the valve by spring pressure j which comes into play to reduce the fluid flow past the valve when the load or pressure on the returning fluid is such that the spring resistance to the closing movement of the disc is overcome. The valve g is similar to that described in Specification 432,146, [Group XXXII]. The disc q may be hinged to the valve as shown in Fig. 1 or it may be quite free of the valve and normally held above it by a coil spring. More than one auxiliary disc may be employed, the graduation of the apertures and the strength of the springs being chosen to suit requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1986749A GB669929A (en) | 1949-07-28 | 1949-07-28 | Improvements relating to hydraulic lifting rams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1986749A GB669929A (en) | 1949-07-28 | 1949-07-28 | Improvements relating to hydraulic lifting rams |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB669929A true GB669929A (en) | 1952-04-09 |
Family
ID=10136503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1986749A Expired GB669929A (en) | 1949-07-28 | 1949-07-28 | Improvements relating to hydraulic lifting rams |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB669929A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1011814B (en) * | 1954-07-03 | 1957-07-04 | Irion & Vosseler | Facility for floor handling equipment |
| DE1017535B (en) * | 1955-04-25 | 1957-10-10 | Friedrich Jungheinrich Dr Ing | Lift mast for stacking floor handling equipment |
| DE1043946B (en) * | 1957-02-15 | 1958-11-13 | Yale & Towne Mfg Co | Pallet truck with a liftable load carrier on a stand that can be lifted vertically on a main stand |
-
1949
- 1949-07-28 GB GB1986749A patent/GB669929A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1011814B (en) * | 1954-07-03 | 1957-07-04 | Irion & Vosseler | Facility for floor handling equipment |
| DE1017535B (en) * | 1955-04-25 | 1957-10-10 | Friedrich Jungheinrich Dr Ing | Lift mast for stacking floor handling equipment |
| DE1043946B (en) * | 1957-02-15 | 1958-11-13 | Yale & Towne Mfg Co | Pallet truck with a liftable load carrier on a stand that can be lifted vertically on a main stand |
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