EP0683753A1 - Hydraulic control device for a loading crane - Google Patents
Hydraulic control device for a loading craneInfo
- Publication number
- EP0683753A1 EP0683753A1 EP95903209A EP95903209A EP0683753A1 EP 0683753 A1 EP0683753 A1 EP 0683753A1 EP 95903209 A EP95903209 A EP 95903209A EP 95903209 A EP95903209 A EP 95903209A EP 0683753 A1 EP0683753 A1 EP 0683753A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crane
- switching
- loading crane
- control
- levers
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/52—Details of compartments for driving engines or motors or of operator's stands or cabins
- B66C13/54—Operator's stands or cabins
- B66C13/56—Arrangements of handles or pedals
Definitions
- the invention relates to a hydraulic control device for a loading crane, wherein, by means of control slides which are arranged next to one another and can be actuated by means of shift levers, on the one hand different functions of the crane itself and on the other hand different functions of an auxiliary device, in particular a support device for the truck carrying the crane, can be activated.
- Trucks that carry a loading crane are often provided with a support in the form of supports that project laterally from the loading area so that the truck maintains its position when the loading crane is actuated.
- the control slides and shift levers for actuating this support device are provided in addition to each control slider and shift levers which are necessary for extending and retracting, lifting, lowering and rotating the crane itself.
- the object of the invention is to considerably reduce the structural complexity of such a control device, with good operability of the control device being guaranteed. This is achieved in that at least some of the control slide switch valves are connected downstream, which depending on their switching position direct the hydraulic fluid coming from the associated control slide either to the crane or to the auxiliary device.
- the control slides of a loading crane can usually be operated from the left side as well as from the right side of the vehicle by means of a series of shift levers coupled in pairs. Even the number of these Shift lever is generally reduced by the invention, since at least one shift lever or a switching device for the changeover valves is additionally to be provided, on the other hand, however, all other shift levers are now optionally used to actuate the crane or the auxiliary device.
- Shift levers for actuating a laterally extendable support on the other hand, the measure is known to make the shift levers arranged next to one another inaccessible by flipping up a cover.
- the hydraulic system cannot be actuated; when the cover is open, each gearshift lever can be swiveled by hand and the loading crane or the support can thus be moved.
- Another embodiment of a loading crane according to the invention is based on the consideration that an unwanted and, in particular, also unauthorized actuation of the support during crane operation should be made more difficult than hitherto.
- the switching lever which selects whether the function of the crane or the supporting device can be controlled with the other switching levers, is designed as a switching device which is actuated by the cover.
- the most important thing is to clearly signal when the support device can be actuated so that it is not inadvertently deactivated, while the crane is loading.
- the coupling of the switching device to the pivoting position of the cover is therefore preferably carried out in such a way that the cover can be locked in an approximately horizontal intermediate position, in which only the actuation of the support device is possible, whereas with the cover completely folded down, only the actuation of the Loading crane is possible.
- FIG. 1 shows a hydraulic circuit diagram
- FIG. 2 shows a graphical representation of a valve block according to the invention
- FIG. 3 shows a horizontal section through the valve block according to FIG. 2
- FIGS. 4 to 6 show a graphical representation of an actuating device for the hydraulic drives with open or half-open or closed cover.
- the hydraulic device for the loading crane of a truck shown in FIG. 1 has, in a known manner, a tank 5, from which the hydraulic fluid reaches the main control block 3 via a pump 6.
- the control block contains a series of control spools 11 - 14 arranged next to one another. These are constructed as three-way valves, so that hydraulic fluid can optionally be placed in the lines 41 -. 44 or 41 '- 44 • can be pressed.
- the lines 44, 44 * can be assigned to the double-acting cylinder of the push arm, the lines 43, 43 'to the articulated arm, the lines 42, 42' to the lifting arm of the crane and the lines 41, 41 'to the swivel mechanism of the crane column.
- the shift levers 21-24 can extend and retract each of the parts mentioned or be held in the rest position.
- the main control block 3 is followed by a valve block 4, which in the exemplary embodiment shown comprises two changeover valves 1, 2 and a pressure relief valve 9.
- the structure of the valve block 4 will be described later with reference to FIGS. 2 and 3.
- the function of the changeover valves 1 and 2 is to make the control slides 11-12 and the associated shift levers 21-22 effective as an alternative to actuating an auxiliary device 61, 62, in the present case the support of a truck. If, for example, the shift lever 31 is shifted from the position shown, the hydraulic fluid reaches the branch 51 or 51 'of the line leading to the support 61 when the shift lever 21 is actuated accordingly.
- the upper cylinder chamber of the support 61 and the support 62 is assigned a pressure limiting valve 9 which keeps the pressure supplied to the auxiliary device significantly lower than the maximum pressure. which is intended for actuating the loading crane itself.
- FIG. 2 shows the valve block 4 from which the lines 51, 51 ', 52, 52', 41, 41 'and 42, 42' originate.
- the internal structure of such a valve block is shown in FIG. 3.
- the auxiliary device 61, 62 can only be actuated when the corresponding valve rods 71, 72 are pushed in and thus the lines 51, 52 and 51 ', 52' for the hydraulic flow coming from the main control block 3 release liquid.
- the hydraulic pressure prevailing in the valve block 4 during normal operation of the crane could lead to the degree of filling of the partial cylinders of the auxiliary device 61, 62 gradually increasing and the position of the vehicle thereby changing.
- horizontally running leak bores 7 are arranged in the valve block 4, which deflect pressure oil escaping via the return line 8.
- each of the control slides 11-14 can be assigned a changeover switch which enables the activation of a function of the auxiliary device.
- the shift levers 21-24 for actuating the control slides 11-14 are usually provided in duplicate, namely on the left and right of the vehicle. It can be expedient to assign to the respective series of shift levers 21-24 only those shift levers for the changeover valves which permit the actuation of the respective left or right support device.
- the changeover valves on one side, for example for the lateral extension and lowering of the supports, can on the other hand be actuated by a single shift lever.
- FIGS. 4 to 6 An actuating device for the hydraulic drives of a loading crane and the support of the loading crane is shown in FIGS. 4 to 6.
- the device comprises a main control block 3, which is followed by a valve block 4.
- the switching levers 21 ff actuate the loading crane 18. If the switching valves 1 and 2 are in the position according to FIG. 5, the same switching lever 21 acts on the support device 61, 62 for the loading crane.
- the actuation of the changeover valves 1 and 2 by pivoting the cover 19 is essential to the invention.
- the switch levers 31, 32 for the changeover valves 1 and 2 run parallel to one another.
- the actuation of the shift lever 21 leads to a movement of the loading crane and not the support. If the cover 19 is now brought into the position according to FIG. 5, it is secured in this position in that the recess 16 clicks into the locking lever 15 on the pin 17.
- the link 7 connected to the cover 19 is pulled outwards, the shift lever 31 moves into an oblique position and actuates the valve 1.
- the toothing 10 between the shift levers 31 and 32 ensures that the shift lever 32 is simultaneously in the backdrop 8th moves and the valve 2 actuated.
- the cover arranged on the opposite side of the vehicle is not actuated Rather, pivotable backdrop 8 remains in its initial position.
- the shift levers 31 and 32 can also be decoupled, in contrast to the exemplary embodiment shown.
- the shift levers 21 ff are inaccessible.
- the changeover valves 1, 2 could therefore only be actuated by the link 8 pulling the shift lever 32 into the inclined position, as has been shown in FIG. 5 for the shift lever 31. In this case, the shift lever 31 would pivot outward within the link 7.
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT2536/93 | 1993-12-14 | ||
AT253693A AT403037B (en) | 1993-12-14 | 1993-12-14 | Hydraulic control device for a loading crane |
AT0015794U AT334U1 (en) | 1994-07-01 | 1994-07-01 | LOADING CRANE |
AT157/94 | 1994-07-01 | ||
PCT/AT1994/000191 WO1995016630A1 (en) | 1993-12-14 | 1994-12-09 | Hydraulic control device for a loading crane |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0683753A1 true EP0683753A1 (en) | 1995-11-29 |
Family
ID=25591674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95903209A Withdrawn EP0683753A1 (en) | 1993-12-14 | 1994-12-09 | Hydraulic control device for a loading crane |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0683753A1 (en) |
WO (1) | WO1995016630A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE9500441L (en) * | 1995-02-08 | 1996-06-10 | Hiab Ab | Control units for vehicle-borne cranes |
SE503986C2 (en) * | 1995-02-08 | 1996-10-14 | Hiab Ab | Protective cover for control levers |
GB2340349B (en) * | 1995-04-18 | 2000-05-03 | Mitsubishi Electric Corp | Radio data transmission system |
SE506050C2 (en) * | 1996-02-16 | 1997-11-03 | Hiab Ab | Locking device for vehicle-borne cranes |
SE517230C2 (en) * | 2000-09-21 | 2002-05-14 | Hiab Ab | Unit for regulating cranes |
SE523691C2 (en) * | 2002-07-02 | 2004-05-11 | Parker Hannifin Ab | Control box for operating a power supply |
DE202013101202U1 (en) | 2013-03-20 | 2013-03-27 | Amf-Fahrzeugbau Gmbh | Stability control device and commercial vehicle |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4171054A (en) * | 1976-12-28 | 1979-10-16 | Kubota, Ltd. | Work vehicle with hydraulic circuit for swivel motor and work assembly arm motor |
JPH0333745Y2 (en) * | 1985-03-29 | 1991-07-17 | ||
DE3901207C2 (en) * | 1989-01-17 | 1994-06-23 | Rexroth Mannesmann Gmbh | Valve arrangement for several hydraulic drives, in particular for the drives of a crane |
-
1994
- 1994-12-09 EP EP95903209A patent/EP0683753A1/en not_active Withdrawn
- 1994-12-09 WO PCT/AT1994/000191 patent/WO1995016630A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9516630A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1995016630A1 (en) | 1995-06-22 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19950721 |
|
AK | Designated contracting states |
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GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
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17Q | First examination report despatched |
Effective date: 19990201 |
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GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
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GRAH | Despatch of communication of intention to grant a patent |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19990914 |