EP2467325A1 - Masts with a whole lifting height - Google Patents
Masts with a whole lifting heightInfo
- Publication number
- EP2467325A1 EP2467325A1 EP10747961A EP10747961A EP2467325A1 EP 2467325 A1 EP2467325 A1 EP 2467325A1 EP 10747961 A EP10747961 A EP 10747961A EP 10747961 A EP10747961 A EP 10747961A EP 2467325 A1 EP2467325 A1 EP 2467325A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frame
- mobile frame
- hydraulic
- stationary
- mast
- 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.)
- Granted
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
- B66F9/08—Masts; Guides; Chains
-
- 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
Definitions
- I he device relates to a lift mast assembly comprising two or three frames, one of which fixed to the fork lift truck chassis and one sliding frame or two sliding frames, a pair of hydraulic two-step cylinders wich are able, by means of a transmission device comprising chains and pulleys, to transmit the motion to the mobile parts of the mast assembly in such a way to perform a first lifting of the fork carriage without any increment of the overall mast length, that is the full free lift, and then a second lifting of the fork carriage up to the maximum lifting heigth, during which the mobile frame slides in the fixed one, or the two mobile frames slide reciprocally, respectively if two or three frames are comprised in the mast assembly.
- hydraulic two-step cylinders according to the present invention doesn't need any flexible pipes and any pertinent guide pulleys to be " fed by hydraulic oil, because their inlet ports are stationary during all lifting stages.
- Figs. 8A-B-C show a schematized side view of the pattern of chain drive at various stages of lifting of a full free lift mast according to the invention, comprising one fixed frame and two mobile frames, operating by means of two hydraulic two-step cylinders whose first stage stroke takes place in the opposite longitudinal direction to the second stage stroke;
- FIG. 9A-B-C show another schematized side view of the pattern of chain drive, different from the previous, at various stages of lifting of a full free lift mast, comprising one fixed frame and two mobile frames, operating by means of two hydraulic two-step cylinders according to the invention;
- An intermediate mobile tube 6 is mounted inside the tube 2, which is characterized by two different wall thicknesses 7 and 8 in order to differentiate the longitudinal hydraulic thrusts in the two sliding directions because of the cylinder 1 is an "immersion" type cylinder, that is the annular chambers above and below the piston 9 are communicating one with the other.
- the cylinder 1 operates like a pair of hydraulic cylinders, an inner and an outer cylinder.
- the outer hydraulic cylinder comprises the tube 2, tube 6 and piston 9 fixed to the tube 6.
- the inner hydraulic cylinder comprises the tube 6, the tubular rod 18 and the piston 19 fixed to the rod 18.
- Fig. 2 represents a partial longitudinal section through the hydraulic two-step cylinder 1 when it has completed the first stroke, the first step, due to the oil pressure provided by a hydraulic pump, shown in dashed lines.
- the outer tube 2 is at the end of the stroke because the lower cap 3, stationary to the outer tube 2, is stopped by the contact with the piston 9 of the intermediate tube 6.
- Fig. 3 finally, represents cylinder assembly 1 at the end of second stage, during which the intermediate tube 6 slides on the tubular rod 18.
- the outer tube 2 and the intermediate tube 6 move together upwards.
- the cylinder 1 has reached its maximum extension as the stop collar 12 is in contact with the lower annular surface of the piston 19.
- the hydraulic fluid within the cylinder 1 is discharged through the cap 22 towards the reservoir, shown in dashed lines, which is at atmospheric pressure, the reverse sequence of lowering is obtained, so that the intermediate tube 6 moves downward, sliding on the rod 18, and also drags the outer tube 2 without relative movement.
- the outer tube 2 begins to slide downward along the tube 6 until the cylinder assembly 1 returns to the neutral condition shown in Fig.1.
- Fig. 5B and Fig. 5C show the front view of the cylinder 51 at the end of each stage.
- Fig. 5B represents the cylinder assembly 51 when the outer tube 52 has completed its downward stroke
- Fig. 5C represents the cylinder 51 at the end of the second stage during which the intermediate tube 56 moves up to its uppermost position and drags simultaneously the outer tube 52.
- the outer hydraulic cylinder comprising the intermediate tube 56, the piston 54 and the outer tube 52 is an "immersion" hydraulic cylinder, i.e. without sealing gaskets arranged on the piston 54: this is not a restrictive condition of the present invention, because both two-step cylinder assemblies 1 and 51 can be arranged to carry out hydraulic cylinders of sealed type, as it will be described below.
- the intermediate tube 66 has constant wall thickness
- the mast assembly 70 is at its maximum elevation, as shown in Fig. 7C.
- Figs. 9A-B-C represent the schematized side view of a full free lift mast 90.
- this mast comprises two mobile frames 82, 83 and one stationary frame 81.
- a hydraulic two-step cylinder assembly 1 of the type in Fig. 1 is shown, i.e. the two strokes of the two-step cylinder 1 are in the same longitudinal direction.
- the mast is schematically depicted in its neutral state in Fig. 9A, at the end of the first lifting stage, the full free lift, in Fig. 9B, and at the end of second lifting stage, i.e. at the maximum expansion of the mast, in Fig. 9C.
- the transmission of movements from the moving parts of the cylinder 1 , i.e. the outer tube 2 and the intermediate tube 6, to the moving parts of the mast assembly, i.e. the fork carriage 87, the intermediate frame 82 and the inner frame 83, is provided by a pair of chains 91 which are guided by three pairs of pulleys 92, 93 and 94.
- Figs. 10A-B-C represent the functional sequence of a full free lift mast 100 comprising a single mobile frame 72: respectively, Fig. 10A shows the mast assembly 100 in its neutral state, Fig. 10B shows the mast 100 at the end of first stage, the full free lift, and Fig. 10C shows the mast 100 at the end of the second stage, at the maximum extension.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Magnetic Heads (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMT2009A000003A IT1395186B1 (en) | 2009-08-17 | 2009-08-17 | LARGE LIFT FREE |
PCT/IT2010/000335 WO2011021231A1 (en) | 2009-08-17 | 2010-07-27 | Masts with a whole lifting height |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2467325A1 true EP2467325A1 (en) | 2012-06-27 |
EP2467325B1 EP2467325B1 (en) | 2014-09-10 |
Family
ID=42046135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10747961.0A Not-in-force EP2467325B1 (en) | 2009-08-17 | 2010-07-27 | Masts with a whole lifting height. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2467325B1 (en) |
IT (1) | IT1395186B1 (en) |
WO (1) | WO2011021231A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1408595B1 (en) | 2010-06-14 | 2014-06-27 | Varvara | LIFTS WITH GREAT LIFT WITH IMPROVED VISIBILITY |
CN110143538A (en) * | 2018-02-11 | 2019-08-20 | 沈阳新松机器人自动化股份有限公司 | A kind of multistage lifting mechanism |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2505009A (en) * | 1948-12-16 | 1950-04-25 | Yale & Towne Mfg Co | Lift truck |
US2670811A (en) * | 1949-01-17 | 1954-03-02 | Towmotor Corp | Multicylinder hydraulic lift truck |
US3072219A (en) * | 1955-10-31 | 1963-01-08 | Hyster Co | Free lift cylinder |
FR1325390A (en) * | 1962-06-14 | 1963-04-26 | Lansing Bagnall Ltd | Raising pallet trolley on triple telescopic jib crane |
JPS5326385B2 (en) * | 1972-07-25 | 1978-08-02 | ||
US3805681A (en) * | 1972-11-22 | 1974-04-23 | Towmotor Corp | Lift cylinder assembly for lift truck mast and carriage |
DE102004042772A1 (en) * | 2004-09-03 | 2006-03-09 | Linde Ag | Processing machine e.g. ground conveyor, has hydraulic system with hydraulic cylinders and pressure medium reservoir formed as container pipes that are closed on both sides, where pipes are arranged in area of housing |
-
2009
- 2009-08-17 IT ITMT2009A000003A patent/IT1395186B1/en active
-
2010
- 2010-07-27 EP EP10747961.0A patent/EP2467325B1/en not_active Not-in-force
- 2010-07-27 WO PCT/IT2010/000335 patent/WO2011021231A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011021231A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2467325B1 (en) | 2014-09-10 |
IT1395186B1 (en) | 2012-09-05 |
WO2011021231A1 (en) | 2011-02-24 |
ITMT20090003A1 (en) | 2011-02-18 |
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