DE2408405A1 - HYDRAULICALLY OPERATED LIFTING DEVICE - Google Patents

Description

RICHARD GLAWE PATENT Al * W * LTE ■ DIPL-PHYS. DR. WALTER MOLL DR.-ING. MONKS DIPL-ING. KLAUS DELFS Monks
2408405 • HAMBURG 8MDNCHEN2S 2 HAMBURG 52
PO Box 37 WAITZSTR. 12th
UEBHERRSTR. 20 days m »892255
TEL. (089) 224548 TELEX 21 2921 ipez
TELEX 52 25 05 spaz YOUR MESSAGE FROM MUNICH YOUR SIGN OUR SIGN A 78 REGARDS:

SIMON ENGINEERING DUDLEY LIMITED Dudley / England

Hydraulically operated lifting device

The invention relates to a lifting device with an articulated boom construction, the first, pivotable on a vehicle or similar support part and preferably also rotatably mounted boom and at least one second boom which is pivotable with the free end of the first Boom is connected, and with hydraulic drive cylinders for performing the rotary movement of the second boom

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ORIGINAL INSPECTED

relative to the first, as well as both arms relative to the supporting part.

It is essential to ensure that the relative weight movement of the boom does not cause a potentially unstable condition, i.e. if an imaginary vertical line from the common focus of the various ropes of the Auelegerkonstruction falls outside of the support area. Around To avoid such instability, it is necessary to limit the range of motion of each boom according to the support range mentioned: and the position of one or more of the other booms.

Furthermore, it is considered essential to ensure that movement of one of the booms does not suddenly occur on its own permitted limit or is stopped at the stroke ends of the hydraulic drive means.

The object of the invention is to create a lifting device of the known type in which the movement of the boom is prevented in a potentially unstable position and in which preferably permitted movements are progressively delayed in order to prevent a sudden stop at the permitted gates.

According to the invention, this object is achieved in that

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associated with each of the boom means and movably connected to it are to transmit independent and common movements of the boom to stops that are movable to the Actuate control valves of the hydraulic drive cylinder, the stops depending on the movement of the boom and according to the allowable range of rotational movement, stopping the movement of the drive cylinders to prevent the boom construction adopts a potentially unstable configuration.

An embodiment of the invention will now be described below described using an example with reference to the accompanying drawing. Show it:

Fig. 1 and 2 schematically a,, boom construction in two operating locations;

3 shows a side view of a connection system according to the invention, which is connected to the boom structure and has stop means, and

FIG. 4 shows a plan view of an arrangement according to FIG. 3.

According to FIGS. 1 and 2, an articulated boom construction has two main booms 10 and 11, which are the first in the following or second boom, and a shorter one

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Auxiliary boom 12, at the outer end of which a cage or a work platform 13 is rotatably attached. The bottom or innermost end of the first boom 10 is rotatably mounted on a turntable 9 to rotate relative to a support member such as a vehicle (not shown).

A parallel guide connection system is provided to keep the cage 13 horizontal in all positions of the boom structure to keep. The system has three leveling rods 14, 17 and 19, which form parallelograms with the first, second and jib, respectively.

Drive means are used to raise the first boom relative to the turntable 9 and the second boom relative to the first provided which have hydraulic cylinders 20 and 20a. The cylinder 20a actuates one with the second Cantilever connected rod 21, while a rod 22 with one end with a partial point of the rod 21 and at the other end is connected to the first boom 10 · The cylinder 20 and the rods 21 and 22 are along the longitudinal center line of the Cantilever structure arranged. An axis of rotation 23 'to which the rod 22 is attached extends outward through the wall of the boom 10, and at one end a first link 24 is attached. A second link 25 is rotatable connected to the link 24 and extends along it

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the side of the boom 10 back to the turntable 9. The from the link 24 distal end of the link 25 is rotatably connected to one end of a common link 26, the other end to the is rotatably connected to the lower leveling rod 14 belonging to the boom 10.

It is clear that an upward or downward movement of the second boom 11 on the common link 26 via the rods 21, 22, the axle 23 and the connecting links 24 and 25 is transmitted, and that an upward or downward movement of the first boom 10 on the common Link 26 is transmitted through the lower leveling rod 14 «

According to the Pig. 3 and 4 is one with one end of the upper end of the common link 26 rotatable connected drive link 27 connected at its other end to a drive arm 28 · The arm 28 is on its lower end is rotatably attached to a shaft 30 attached to the boom 10 and carries in the vicinity of the axis Stops 29 and 29a.

At about its midpoint is on the link 26 also rotatably connected one end of a further drive link 31, which at its other end with

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a point of another drive arm 32 is connected. The arm 32 is also rotatably fastened on the axis 30, and a corresponding drive arm 32a is fastened to the boom 10 at a distance therefrom and rotatably on an axis 33. A rod 34 connects the upper ends of the drive arms 32 and 32a which supports the four stops or retainers A, B, 0 and D «,

Another pair of drive arms 35 and 36 rotatably mounted on an axle 30 and an axle 37, respectively, are attached their upper ends connected by a rod 38, along its longitudinal extension spaced two more Stops or holding devices E and]? wearing.

Another pair of drive arms 39 and 40 are on Acheen 37 or 33 rotatably attached and through at their upper ends a rod 41 connected to the two further stops or holding devices arranged at a distance along its longitudinal extent Gf and H wears.

The drive arms 36 and 39 are normally held in the positions shown in Figs. 3 and 4 by springs 42.

Me drive arms 28, 32, 32a, 35, 36, 39 and 40 are all independent of one another and free on their associated axes 30, 33 and 37 rotatable.

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Two further abutments X and Y are attached directly to the leveling rod 14 at a distance from one another and extend over the curve of the rotational movement of the arm 39.

The stops A to H, all preferably · in their Position on their associated rods for mounting the device are adjustable, are close to the actuation Control levers 50 and 51 are arranged, which are rotatably mounted on the axes 52 and 53, respectively, and are adapted to the hydrau-Iisehen Operate cylinder to raise and lower the first or »second boom. The movement of the lever 50 after left and right in Fig. 4- causes the first boom to be lowered and raised, respectively. The movement of the lever 51 to the left and right in Mg. 4 causes the second boom to be raised or lowered.

The system described is set up to ensure that the boom structure never ends up in a potential unstable position can be moved, which would occur if an imaginary vertical line starting from the common Center of gravity of the parts of the boom structure outside one Area determined by the support structure normally found on a vehicle with stabilizers ο

The position of the parts shown in Figures 3 and 4 shows

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a state when both booms 10 and 11 are folded in one Location, doh. both horizontally and on top of each other.

When the second boom 11 is raised, the first Boom 10 remains in a horizontal position, and the lever 51 is at its left movement limit, becomes the connecting link 25, which is indirectly attached to the rod 22, is moved to the right in "Figures 3 and 4. When the lower boom remains in place, the leveling rod 14 is also stationary so that the link 26 is clockwise is rotated so that the link engages arms 32 and 32a, rod 34 and stops A, B, 0 and Move D to the right each time. The relative sizes of the various moving parts of the system are dimensioned in such a way that, when the second boom 11 approaches its permitted stroke limit, the stop 0 on the rod 34 controls the control lever 51 touches it, gradually moving it back to a central position, thus delaying the lifting of the boom and finally persists.

When the first boom 10 is raised with the lever 50 at its right limit of travel, the lower Mvellierungsstab 14 moved to the left. The connecting link 26 rotates clockwise around its upper end, whereby the stop C is moved away from the control lever 51,

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whereby, if desired, a further increase in the second Boom 11 is made possible. When the first boom approaches a position where the second boom 11, the jib 12 or the cage 13 touches the floor or the platform frame, the stop B on the rod 34 touches the Control lever 50, whereby it is again gradually moved back to a central position. Another raise of the second boom however, moves the stop B away from the control lever 50, thereby further lifting the if desired first boom is made possible.

It can therefore be seen that the joint movements of the two cantilevers through the connecting link 26 act on the rod 31 that, depending on the prevailing conditions, stops A, B, 0 and D on the control levers and 51 moved toward or away from them to maintain a steady state of the boom structure; as needed, controls hence the stop A the downward movement of the lower boom 10 and the stop D the downward movement Movement of the upper boom 11.

The stops A, B, 0 and D thus serve to control the range of motion of the booms 10 and 11 within safe limits and to delay this movement when the booms approach these limits. On the other hand, the remaining part of the system to be described below serves to

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To retard the movement of the booms when they approach the limits determined by the stroke of the hydraulic drive cylinders.

When the second boom is raised, the link 25, rod 27 and ann 28 move to the right. During this movement, after some time, the abutment 29 at the end of the arm 28 touches the arm 35, bringing these together with the arm 36 moved to the right as the movement of the arm 28 progresses. Assuming that the stop C is the second boom allowed its normal lift limit, which is determined by the stroke of cylinder 20a when

to reach, the boom approaches this state / touches the stop E on the rod 38 the control lever 51 and moves it gradually in the direction of its central position, so that the lifting of the The boom is delayed and finally stopped. If this condition is made easier by lowering the second boom is and the abutment 29 may move away from the arm 35, this is together with the arm 36 by one of the Peder pairs 42 caused to return to the position shown in FIGS. 3 and 4.

When the first boom 10 is raised, the lower leveling rod 14 is moved to the left until the boom moves approaches its normal increase limit, which is determined by the stroke of the drive cylinder, with the stop Y on

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the leveling rod 14 touches the arm 39 and this after moved to the left so that the stop H touches the control lever 50 and gradually moves it towards its middle Layer moved, this serving to delay and eventually stop the lifting of the first boom. if this position is abandoned by lowering the first boom, the stop Y is the arm 39 free, which together with the arm 40 is moved back into its original position by the other pair of springs 42.

When the first boom is lowered into its collapsed position on the vehicle and he is in that position approaches, touches and moves the stop X the arm 39, so that the action of the stop G the movement of the first boom by touching the control lever 50 slows down and finally stops and this gradually to its middle Location moves.

When the second boom is lowered into its folded position, resting on the first boom on the vehicle and he approaches this position, the abutment 29a touches the arm 35 and moves it to the left in 3 and 4. Therefore, the stop F on the rod 38 contacts the control lever 51 and gradually moves it into its middle position to slow down the movement of the second boom and finally stop it.

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The arrangement shown in Figs. 3 and 4 is arranged within a housing 45 on the first bracket 10, which also houses the control levers 50 and 51, which can be operated manually, while a second control in the cage 13 is provided. Actuation of the second control causes actual movement of the main control levers 50 and 51 »which ensure that the safety system is in operation when the boom construction is moved by an operator either in the cage or on the edge of the device. In some cases it is a device is provided which makes it possible to prevent the movement of the boom from the cage to control. However, the safety system is connected and remains connected to the control devices on the flow of the device therefore always ready for use.

Furthermore, in the arrangement described with reference to the drawing, the movements of the second boom from the boom itself or any part or parts moving with the boom. However it is convenient to use the rod 22 for this purpose when it extends over a smaller angle than the second boom moves, although its movement remains proportional to that of the rod. This smaller angle of movement is approximate equal to that over which the first boom moves, so that 'both ends of the common link via one

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move similar angle, creating a multi-part construction of the connecting link to combine the movements, which are transmitted by both booms becomes unnecessary.

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Claims (11)

Claims 1. Lifting device with a hinged boom construction, the first boom that is pivotably and preferably also rotatably attached to a vehicle or similar support part and at least one second boom pivotally connected to the free end of the first boom, and with hydraulic drive cylinders for performing the rotary movement of the second boom relative to the first and both Cantilever relative to the supporting part, characterized in that means are assigned to each of the cantilevers (10, 11) and can be moved with it in order to move the arms (10, 11) independently and jointly towards stops (A - H) transmitted, which are movable to the control valves of the hydraulic Actuate drive cylinder (20, 20a), the stops (A -H) depending on the movement of the boom (10, 11) and stop the actuation of the drive cylinders (20, 20a) in accordance with the permitted rotary movement range in order to prevent the boom structure from assuming a potentially unstable configuration. 2. Lifting device according to claim 1, characterized in that the means connected to the boom two first parts (14, 25) which are substantially linear can be moved back and forth depending on the rotational movement - 14 409834/0416 iS gene of the associated boom (10 or 11) clockwise or counterclockwise that the stops (A - D) through a third Part (34) are held, which is also substantially linearly movable and operationally with the first two parts (14, 25) is connected and that the position of the third part (34) is always the combined linear position of the first two parts reproduces. 3. Lifting device according to claim 2, characterized in that the two first parts (14, 25) to relative movement in opposite directions with simultaneous raising or lowering of both booms (10, 11) is provided are and that the third part (34) rotatable with a common part (26) extending therebetween and with the two first parts (14, 25) is rotatably connected, so that the movement of the third part (34) is always the sum of the movements of the first two parts. 4. Lifting device according to claim 1, characterized in that the with the arms (10, 11) connected Means can be moved with the booms in such a way that their movements are transferred to additional stops (E - H), which are movable to move the control valves, and that these stops are arranged so that the actuation each working cylinder (20, 20a) is gradually braked when the corresponding boom .sich a completely lowered or approaching fully raised state. - 15 409834/0416 5. Lifting device according to claim 4, characterized in that the additional stops (E - H) through two further rectilinear reciprocating parts (38, 41) are carried, which are normally in a resting position are held and can only be moved when their corresponding boom is fully lowered or raised State is approaching. 6. Lifting device according to claim 5, characterized in that one of the parts (38, 41) by a pair at a distance arranged abutments (29, 29a) is moved, which are connected to the means connected to the booms. 7. Lifting device according to claim 5, characterized in that one of the parts (38, 41) by a pair spaced abutment (29, 29a) is moved, which are attached to a rotatable arm (28) with the one of the boom associated means is connected. 8. Device according to one of claims 1 to 7, characterized in that the chnet with the first boom (10) connected means consist of a leveling rod (14), which is part of a leveling parallelogram linkage forms, the other part of which is formed by the first arm (10). - 16 409834/0416 9. Lifting device according to one of claims 1 to 8, characterized in that with the second Boom (11) connected means are formed by a rod (25) which is connected to the piston of the hydraulic working cylinder (2Oa) of the second boom (11) is connected. 10. 'Lifting device according to one of claims 1 to 9, characterized characterized in that the means connected to the booms (14, 25, 34), the stops (A - H) and the Control valves (20, 20a) are arranged on the first boom (10) in the vicinity of the lower end thereof. 11. Lifting device according to claim 10, characterized in that the control valves (20, 20a) can be operated manually and are connected to a second control device for simultaneous actuation, which is attached to a cage (13) or a work platform at the top of the boom structure is provided. - 17 - 409834/0416