GB998314A - Flow control system for load-handling apparatus - Google Patents
Flow control system for load-handling apparatusInfo
- Publication number
- GB998314A GB998314A GB692462A GB692462A GB998314A GB 998314 A GB998314 A GB 998314A GB 692462 A GB692462 A GB 692462A GB 692462 A GB692462 A GB 692462A GB 998314 A GB998314 A GB 998314A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinders
- fluid
- spool
- mast
- rams
- 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
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
- B66C19/005—Straddle carriers
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
998,314. Lift trucks. HYSTER CO. Feb. 22, 1962, No. 6924/62. Heading B8H. In an hydraulic system comprising two or more rams which are supplied with fluid from a common source, such as an hydraulic system for a fork lift truck provided with a pair of masttilting rams or for a straddle carrier provided with four rams for raising a pair of load supports, check valves are provided prohibiting fluid flow between the cylinders after the positions of their pistons has been set but permitting either set of ends of the cylinders to be supplied with fluid under pressure and the cylinders to be connected together for the supply of fluid from a common source. As shown in Fig. 2, when the spool of a directional control valve 43 is moved to the right to tilt the mast 13 of a lift truck forwardly, fluid passes from the pump 45, through the line 53 to the righthand side of the cylinders 15, 17 of the tilt rams and through lines 53, 68 to the spool of a valve 61 which is thereby moved to the left against the action of a spring 67 thereby connecting lines 63, 65 from the left-hand side of cylinders 15, 17 to the line 55 from the reservoir 49. If the mast tends to tilt forwardly under its own load, the pressure at the right-hand side of cylinders 15, 17 will drop and the spool of valve 61 will be moved back by the spring 67 to the position shown, thereby breaking the connection between the lines 63, 65 from the cylinders. The mast is tilted back by moving the spool of valve 43 to the right so that fluid from the pump passes through the line 55 and ball valves 83, 79 to the left-hand side of cylinders 15, 17. If, when the spool of valve 43 is centred, the mast 13 tends to twist as the truck goes round a corner, the ball valves 83, 79 prevent flow of fluid between the cylinders and therefore prevent the mast from twisting. A similar circuit, Figs. 3, 4 (not shown), is applied to four rams supporting a pair of load supports of a straddle carrier, wherein the load supports are maintained at the same level in the event of uneven loading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB692462A GB998314A (en) | 1962-02-22 | 1962-02-22 | Flow control system for load-handling apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB692462A GB998314A (en) | 1962-02-22 | 1962-02-22 | Flow control system for load-handling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB998314A true GB998314A (en) | 1965-07-14 |
Family
ID=9823336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB692462A Expired GB998314A (en) | 1962-02-22 | 1962-02-22 | Flow control system for load-handling apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB998314A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2465812A1 (en) | 2010-12-16 | 2012-06-20 | BT Products AB | Industrial truck comprising an extendable mast |
-
1962
- 1962-02-22 GB GB692462A patent/GB998314A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2465812A1 (en) | 2010-12-16 | 2012-06-20 | BT Products AB | Industrial truck comprising an extendable mast |
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