EP0373617B1

EP0373617B1 - Shiftable scaffold movable in sections on a wall

Info

Publication number: EP0373617B1
Application number: EP89123029A
Authority: EP
Inventors: Artur Schwörer
Original assignee: Peri Werk Artur Schwoerer GmbH and Co KG
Current assignee: Peri Werk Artur Schwoerer GmbH and Co KG
Priority date: 1988-12-14
Filing date: 1989-12-13
Publication date: 1993-03-10
Anticipated expiration: 2009-12-13
Also published as: ES2038817T3; DE58903732D1; EP0373617A2; DE3844977C2; EP0373617A3; US5000287A

Description

The invention relates to a sliding platform which can be moved upward in sections on a wall, in accordance with the preamble of patent claim 1.
Such transfer platforms are preferably those which are arranged on a building to be constructed of concrete and are components of a climbing formwork which, after concreting a section of a building wall, is raised by a section so that a further section of the wall is concreted there can. The essence of such a transfer platform is that it has no direct connection to the ground when climbing and is only fastened to the section below the section to be concreted and already concreted by the support shoes. For each formwork panel, two support rails are usually arranged next to one another at a distance. In principle, however, a design with only one mounting rail in the middle of a formwork panel is also possible.
The invention is therefore primarily concerned with sliding platforms for climbing formwork, which can preferably be pushed up by a concreting section without outside help. In principle, however, further applications are conceivable for the transfer platform according to the invention. For example, the transfer platform can also be used in facilities for climbing work and protective scaffolding, work platforms, platforms and the like. be used. It is also used in institutions for horizontal or diagonally upward shifting of tunnel formwork wagons, reinforcement wagons, mobile wall formwork, e.g. for retaining walls and the like. usable. Finally, it can also be used for devices for the horizontal, upward or vertical movement of heavy objects of all kinds, such as ship segments, transformers, etc. However, it is primarily used in formwork and scaffolding.
Formwork and armor are already known which interact with self-climbing devices in the manner of a generic transfer platform. They are mainly used in the construction of bridge piers or in the construction of power plants and cooling towers. Basically, climbing frames such as e.g. an automatic climbing machine or individual guiding elements, in which, due to the lack of large-area formwork elements, it is either not necessary to synchronize with neighboring guidings or can only be maintained by constant observation and correction. Furthermore, known solutions for climbing a larger concreting section either require a large number of expensive intermediate anchors to the building or are very large and heavy in their external dimensions. Another disadvantage of the known transfer platforms is that different frame widths are required for elements of different widths, which lead to a large number of height and width of different device variants. In the larger versions, a very high initial concrete section must first be created with separate formwork before the automatic climbing machine can be mounted on it.
The invention is based on a climbing transfer platform, as described in DE-A-28 14 930.
The object of the invention is to provide a transfer platform to produce the type mentioned at the outset, which is intended in particular for climbing on a structure to be concreted, in which, with little technical effort and in a robust manner which is particularly suitable for working on a construction site, several units combined to form a shifting console can be safely moved at the same time without that jamming or even damage occurs in the event of unequal displacements on different mounting rails, in which failure of the feed on a specific mounting rail does not lead to damage and in which a climbing section can be carried out fully automatically without manual intervention.
To achieve this object, the features of the characterizing part of claim 1 are provided. An advantageous development of the invention is characterized by claim 2, wherein the securing against further advancement when the toggle levers are not securely engaged according to claim 4 is expediently brought about by the measures according to claim 8.
According to the invention, the problem of evenly starting up the displacement elements on adjacent mounting rails is solved in that the displacement console feed or stroke is chosen to be very small and in fact so small that in the event of a fault on a mounting rail which prevents the displacement of the displacement console there, only too a tolerable inclination of the part of the sliding bracket extending between two adjacent mounting rails. This is achieved according to the invention in that the next step or stroke is only initiated when all the displacement elements which are connected to a common control device have reached the same level.
The invention can be implemented in a particularly advantageous manner by claims 3 to 7.
A short hydraulic cylinder can advantageously be used as the drive, which is connected to the part to be displaced (displacement console) and has guides with articulated levers on its cylinder housing and its piston rod, which are supported on the mounting rail and take over the load alternately.
Instead of the hydraulic cylinder, however, other linear drives such as e.g. Spindle drives, chain or belt drives, pneumatic cylinders, rack drives or electric linear motors are conceivable.
Similar to a tree crampon, the two levers alternately engage in the tooth recesses of the sliding teeth, which are present on one side in the climbing rail at equal intervals. A resilient return element (e.g. a spring cylinder) presses each lever with the integrated support pin against the rail contour, slides along the recess edge, finally along the outer contour, to jump into the next recess afterwards and, after reversing the movement of the drive, to be supported in it. The movement is reversed only after the moving lever has reached its inclination that corresponds to the later resting position. The message to the drive control is expediently carried out by proximity switches or electromechanical limit switches which are actuated by the levers and whose signals are fed to a sequential control. An additional safety measure can be the linking of the lever end position signal with the drive end position signal (e.g. using a pressure switch, proximity switch, etc.). If several climbing units are used at the same time, the movement is reversed only after all end elements have been reported.
The forces and moments of the rail guides arranged opposite to each other counteract the forces from the lever support. But it is also conceivable to use a symmetrical double lever system that engages in tooth recesses on the rail on both sides.
By moving the lever beyond the dead center of the return device, it is very easy to push the climbing rail into the next climbing section. For this reason, the tooth recesses - seen transversely to the splint - are symmetrical.
If the sequence of small climbing steps has been completed up to the end of the upper section, the further displacement of the displacement element is automatically blocked in that the displacement toothing stops at this point. A reversal of movement of the drive is reliably prevented as soon as the sliding shoes reach the end of the sliding teeth. This applies to both climbing the sliding bracket and alternately pushing the mounting rail.
In the construction principle described, the relatively inexpensive to produce support rail can be used in different lengths to match the height of the concreting section without changes to the rest of the climbing device.
In the event of any kind of walking disability, damage can largely be prevented in a simple manner, e.g. through the installation of pressure limiting valves in the hydraulic system or through torque limiting devices in electromechanical drives, e.g. Slip clutches, shift clutches, etc.
When using a mounting rail profile with essentially H-shaped cross-section allows a direct connection between the sliding bracket and the support shoe attached to the wall by gripping the rail on both sides.
The measures according to claims 8 and 9 are preferably provided so that the support rail automatically comes into a load-bearing engagement with this support shoe when its upper end is pushed through the upper support shoe.
Due to the design according to claim 9, it is ensured that the guide shoe, which is initially held in the horizontal direction by the support rail when pushed up, finally comes into horizontal supportive engagement with the support shoe when pushed up, while the support rail for subsequent easy pushing up apart from sliding engagement with the support rail reached.
As soon as the guide shoe has left the support shoe, a rearrangement of the horizontal support forces occurs in the sense that the mounting rail supports the sliding bracket again while the rail is in turn held on the support shoe.
The geometric design of the upper and lower sliding console guide is selected so that it cannot collide with the rail guide when passing a support shoe attached to the wall.
Due to the minimization of the individual lifting or shifting steps, the smallest dimensions and weights result, whereby a manual implementation of the shifting or climbing mechanism from formwork element to formwork element is made considerably easier. Because of the automated climbing process, which is largely free of safety risks, several can Adjacent and connected sliding consoles can also be operated without visual contact. This is particularly advantageous when climbing complete formwork and working platforms on tower-like structures, such as silos, telecommunication towers, bridge pillars, etc.
Another advantage of the invention is the ability to climb the formwork by simply manually operating the lever.

Fig. 1 eine schematische Seitenansicht einer an einer vertikalen Wand eines Bauwerks angeordneten Verschiebebühne gemäß der Erfindung, die mit einer Schalung zur Betonierung der Wand versehen ist,
Fig. 2 eine schematische Ansicht der Verschiebebühne nach Fig. 1 in Richtung des Pfeiles II in Fig. 1, wobei zusätzlich nach Art eines Blockschaltbildes die Betätigungs- und Steuerelemente wiedergegeben sind,
Fig. 2a eine bevorzugte praktische Ausbildung der umsteuerbaren Druckquelle 30 nach Fig. 2,
Fig. 3 eine teilweise geschnittene vergrößerte Seitenansicht des in den Fig. 1 und 2 gezeigten Verschiebewerks 17,
Fig. 4 einen Schnitt nach Linie IV-IV in Fig. 3,
Fig. 5 eine Ansicht des Gegenstandes der Fig. 3 von der entgegengesetzten Seite ohne Darstellung der Tragschiene,
Fig. 6 eine teilweise geschnittene Ansicht des Gegenstandes der Fig. 3 in Richtung des Pfeiles VI in Fig. 3,
Fig. 7 einen vergrößerten Ausschnitt aus Fig. 1 im Bereich eines auf einen Stützschuh aufgeschobenen Führungsgleitschuhs und
Fig. 8 einen schematischen Horizontalschnitt des Gegenstandes der Fig. 7

1 is a schematic side view of a transfer platform arranged on a vertical wall of a building according to the invention, which is provided with a formwork for concreting the wall,
FIG. 2 shows a schematic view of the transfer platform according to FIG. 1 in the direction of arrow II in FIG. 1, the actuating and control elements also being reproduced in the manner of a block diagram,
2a shows a preferred practical embodiment of the reversible pressure source 30 according to FIG. 2,
3 is a partially sectioned enlarged side view of the shifting mechanism 17 shown in FIGS. 1 and 2,
4 shows a section along line IV-IV in FIG. 3,
Fig. 5 is a view of the object of Fig. 3 from the opposite side without showing the Mounting rail,
6 is a partially sectioned view of the object of FIG. 3 in the direction of arrow VI in Fig. 3,
FIG. 7 shows an enlarged detail from FIG. 1 in the region of a guide sliding shoe pushed onto a support shoe and
8 is a schematic horizontal section of the object of FIG. 7

In all figures, the same reference numerals designate corresponding components.
1 has a climbing formwork transfer platform according to the invention at a distance one above the other on the already concreted part of a wall 12 attached support shoes 11, which according to FIG. 8 have a substantially C-shaped displacement guide space 11 'in which the essentially complementary webs 13 'engage a mounting rail 13 which, according to FIGS. 1, 7 and 8, with its central web 13' trägt carries a pivoting cam 56 pivotable about a transverse axis 61 running parallel to the wall 12, the counterweights 61 on the side of the transverse axis facing away from the wall 12 62 wear, due to which they are biased towards the rail carrying position shown in FIGS. 1 and 7. A lower, toward the wall 12 towards the extension 56 'of the support cams lies in the wearing position shown in FIGS. 1, 7 and 8 on an upper wing 57 of the support shoe 11. The extensions 56 'pass through appropriately dimensioned passage openings 63 (shown in dashed lines in Fig. 8) of the webs 13' of the mounting rail 13th
If the support rail 13 is displaced from the position shown in FIGS. 1, 7 and 8 upwards relative to the support shoe 11, the support cams 56 can be provided on the extension 56 'provided at the top and sloping towards the wall 12 towards the oblique edges 56˝ (Fig . 7) pivot away from the wall, the sloping edge 56˝ sliding along a locking rod 64, which will be described in more detail below and runs parallel to the wall 12 and which holds a guide sliding shoe, to which a sliding bracket 14 is attached, during the pushing up of the mounting rail 13 holds on the support shoe 11.
While the upper end of the support rail 13 is held not only horizontally and laterally but also in the vertical direction due to the support cams 56 on the support shoe 11, the support rail 13 penetrated by the support rail 13 is only supported in the horizontal direction.
Between the two top and bottom arranged support shoes 11, a spreading spindle 65 is arranged between the wall 12 and the lower end of the sliding bracket 14, which serves to absorb the weight of the sliding bracket 14 directed towards the wall 12 when the mounting rail 13 is pushed up.
The sliding bracket consists of horizontal supports or a horizontal platform 14 ', which is mounted with its end facing the wall 12 towards the guide rail 13 and the support shoe 11 via a guide shoe 58 (Fig. 1, 7 and 8).
At a distance from the wall 12 are provided from the platform 14 'obliquely downwards in the direction of the wall 12 supports 14', while near the wall also vertical Supports 14'˝ between the platform 14 'and the lower end of the inclined supports 14˝ are provided. Horizontal supports 14˝˝ complete the sliding bracket.
A scaffold 14a can also be hung under the console 14.
The lower end 14b of the sliding bracket 14 is connected via a support member 14c directed towards the wall to a sliding or climbing mechanism 17 which is provided with a sliding toothing provided in the left side web 13 Fig (FIG. 8) of the mounting rail 13 facing away from the wall 25 interacts, in the sense that the displacement mechanism 17 gradually works its way up on the mounting rail 13 due to a linear drive 15 provided in it.
The upward movement of the displacement mechanism 17 begins in the vicinity of the lower end of the mounting rail 13 shown in FIG. 1 and ends immediately above the climbing mechanism 17 illustrated in FIG. 1. The displacement mechanism 17 is described in more detail below with reference to FIGS. 3 to 6.
On the platform 14 'of the sliding bracket 14 a suitable for concreting the wall 12 vertical formwork 66 is provided, the formwork 67 brought by the adjustment elements 68, 69 shown in FIG. 1 into the desired position relative to the already concreted section of the wall 12 can be.
According to FIG. 2, numerous - in the present exemplary embodiment three - support rails 13 with guide slide shoes 58 and displacement mechanisms 17 arranged thereon are provided for vertically displaceable support of a displacement console 14. 2, a concreting section is designated by L. By moving the bracket 14 from the lower to the upper end of the mounting rail 13, a feed takes place by the length L one Concreting section.
2, each displacement mechanism 17 has a linear drive 15 in the form of a double-acting hydraulic cylinder 24 containing a piston 23, the two pressure chambers of the hydraulic cylinder 24 being connected via hydraulic lines 26 and 27 to hydraulic branch lines 28 and 29, of which the individual hydraulic lines 26 and 27 leading to the linear drives 15 are branched off. The stub lines 28, 29 are connected to a reversible pressure source 30 within a drive and control device 22. The reversible pressure source 30 is driven by a motor 18 which is connected to a switching device 21 contained within the drive and control device. The switching device can be switched on from the outside via a switch 70, whereupon the motor 18 starts and, depending on the running direction of the motor 18 or the pressure source 30, acts on the stub 28 or 29 with hydraulic pressure. Accordingly, all pistons 23 in the individual linear drives 15 move simultaneously in one direction or the other. The reversible pressure source 30 can e.g. consist of a pump and connected directional valves, which are switched by the switching device 21 in the sense of the desired pressure reversal.
2 a shows a practical embodiment for the reversible pressure source 30. A three-position two-way valve 90 is then connected to a pump 88 fed by the electric motor 18, the suction side of which is connected to a container 89 filled with hydraulic fluid. The other input of the two-way valve 90 is connected to the container 89. At the outlet of the two-way valve 90, the hydraulic branch lines 28 and 29 are applied.
In the central position of the two-way valve shown in Fig. 2a 90, the connections between the pump 88 and the container 89 to the branch lines 28, 29 are interrupted. In the right position, the outlet of the pump 88 lies against the stub 28, while the stub 29 is connected to the container 89. By switching the two-way valve 90 to the left position, the connections are interchanged, so that pressure is now applied to the stub 29 and the stub 28 is applied to the container 89.
The two-way valve 90 is connected to the switching device 21 by means of a control line 86 indicated by dashed lines, which, triggered by the pressure switches 32, 33 and the manual switch 70, controls the positions of the two-way valve 90 that are just required. With the switch 70 in the off position, the two-way valve 90 is in the middle position, while it switches back and forth between the two end positions after the switch 70 is switched on. The control is described in detail below.
The movement of the pistons 23 is limited in both directions by stops 16 and 31 schematically indicated in FIG. 2.
To the spur lines 28 and 29 22 pressure switches 32 and 33 are connected within the drive and control device, which act on the switching device 21 in the sense that when there is a sudden pressure increase in the associated line 28 or 29, as occurs when all pistons 23 of all connected linear drives 15 come to rest against the stop 16 or 31, the pressure source 30 is reversed. If, for example, a sudden pressure increase is detected in the stub 28 and the pressure switch 32 is actuated thereby, the switching device 21 (FIG. 2) switches the two-way valve 90 from the right end position, where the pump 88 is connected to the stub 28, into the left End position, so that the stub 29 is now connected to the pump 88, while the stub 28 bears against the container. Thereupon, the pistons 23 move in the opposite direction in all linear drives 15 until they come to rest on the other stop 31, whereupon a sudden pressure rise occurs again in the associated stub 29, which triggers the pressure switch 33 assigned to it and thereby a renewed reversal of the pressure source 30 causes.
It is essential that the reversal of the pressure source 30 can only take place when all the pistons 23 have reached the prescribed end position. In this way it is ensured that the individual linear drives 15 are not reversed too early, but only when all pistons 23 are in the correct end position.
For safety reasons, at least one displacement sensor 19 is also arranged in each displacement mechanism 17, which responds to the displacement of the displacement mechanism 17 relative to the mounting rail 13 and emits a corresponding signal via an associated line 19 'to a feed detector 20 within the drive and control device 22. A particularly preferred embodiment of a displacement sensor is described below with reference to FIGS. 4 and 5.
When the individual displacement units 17 climb up on the mounting rail 13 step by step, each displacement sensor 19 reports to the feed detector 20 when the associated displacement unit 17 has advanced by one tooth of the displacement toothing 25.
The feed detector forms an output signal from the input signals from all displacement sensors 19, which is also applied to the switching device 21 via a line 71 is. The output signal blocks the switchover in the switching device 21 if one or more of the displacement sensors 19 does not yet report a feed of the associated displacement mechanism 17 by one tooth. In this way, it is additionally prevented that some displacement units 17 climb further if one or more of the remaining displacement units 17 are stuck.
The additional securing of the uniform advance of all displacement units 17 by the displacement transducers 19 is important because a sudden pressure increase in one of the stub lines 28 or 29 can also occur if there is any jamming within the displacement unit that blocks the linear drive 15 before the piston 23 comes to rest on one of the stops 16, 31.
During a back and forth movement work play of the piston 23, each displacement mechanism 17 climbs up between the stops 16 and 31 by one tooth on the displacement toothing 25 of the mounting rail 13. How this happens in detail is described below with reference to FIGS. 3 to 6.
In this way, each displacement mechanism 17 always executes only small lifting steps S. This ensures, in connection with the described electrical and hydraulic circuit, that if a displacement mechanism 17 or a guide slide shoe 58 gets stuck, other displacement mechanisms 17 can at most perform one step S, whereupon the pressure source 30 is no longer reversed due to the suspension of one displacement mechanism 17 can and the further stroke of the shift console 14 is prevented until the fault is eliminated. It is therefore easily possible for the transfer platform according to the invention to be operated by a single operator, even if, for example, not at all in a circular structure all mounting rails 13 are visible from the drive and control unit 22. The work platform controls itself and stops by itself when pushing on one of the mounting rails 13 is hindered, so that the error can then be remedied in a suitable manner.
According to FIGS. 3 to 6, each displacement mechanism 17 consists of two slide shoes 17a and 17b, which are guided by means of the webs 13 'facing away from the wall 12 and are arranged essentially at a vertical distance from one another corresponding to the division of the displacement toothing 25. 4 engages in a guide groove 72 of each slide shoe, while on the outer edge of the other web 13˝ the sliding toothing 25 is arranged, which has tooth recesses 49 at regular intervals, which according to FIG. 3 above and below each have an approximately quarter-circular circular cylindrical region 49 'and an intermediate, parallel region 49' running parallel to the support rail 13.
From the lower slide shoe 17b extends parallel to the support rail 13 upwards a circular guide rod 54, which extends through a vertical guide bore 55 in the upper slide shoe 17a and projects so far upwards over the upper slide shoe 17a that the two slide shoes 17a, 17b at each relative Movement position are secured against rotation relative to each other.
On each slide shoe 17a, 17b, a double toggle lever 41, 42 is arranged pivotably about a toggle lever axis 45, 46, approximately in the middle of the mounting rail 13. The toggle lever axis 45 is perpendicular to the webs 13˝ of the mounting rail 13.
The toggle lever 41, 42 extends laterally up to the sliding toothing 25 and there carries between its two parts 41 (Fig. 4) a support pin 43, 44 of circular cylindrical shape, which have the same diameter as the quarter-circular borders 49 'of the tooth recesses 49. The length of the double toggle levers 41 and 42 is such that when the toggle levers 41, 42 are pivoted in the order of 45 ° to the longitudinal extent of the support rail 13, the support pins 43, 44 are in engagement with the tooth recesses 49 such that one of the support pins 43 or 44 carries the associated slide shoe 17a or 17b via the associated toggle lever 41 or 42.
The double-acting hydraulic cylinder 24 containing the piston 23 is accommodated on the upper slide shoe 17a. A piston rod 34 extends downward from the piston 23, which emerges from the hydraulic cylinder 24 and the upper sliding block 17a in a sealed and sliding manner at the bottom and is firmly connected to the lower sliding block 17b. In this way, the sliding shoes 17a, 17b can be moved away from one another by acting on the upper pressure chamber 73 of the hydraulic cylinder 24 and can be moved towards one another by pressurizing the lower pressure chamber 74.
On the slide shoes 17a, 17b, pivoting levers 39 and 40 are further articulated at a distance A away from the shifting toothing 25 by pivoting lever axes 47, 48 which extend parallel to the toggle lever axes 45, 46 and which likewise extend in the direction of the shifting toothing 25, but clearly above protrude the end of the toggle lever 41, 42 there. Compression springs 75 and 76 are accommodated in this end region of the pivot levers 39, 40. These act on existing sliding blocks 52 and 53 within the pivot levers 39, 40 at the free end of the toggle levers 41, 42, which are aligned with the trunnions 43, 44 and are connected to them in an articulated manner. The sliding blocks 52, 53 are along the longitudinal axes 50 and 51 of the pivot levers 39, 40 axially slidably.
4, a top view of each swivel lever 39, 40 lies next to the double toggle levers 41, 42.
Each pivot lever 39, 40 forms a toggle lever arrangement 35 and 36 with the associated toggle lever 41, 42.
4 and 5 show a possible structural arrangement for the displacement sensor 19, which can be designed in particular as an inductive sensor. In the component of the sliding shoes 17a and 17b receiving the guide groove 72, the displacement sensors 19 are fixedly installed relative to the knee pivot axes 45 and 46 at a short distance from the outer edge of the toggle levers 41 and 42, respectively. The upper toggle lever 41 in FIG. 4 has, according to FIG. 5, a radially projecting encoder cam 19 'on its circumference, which, when arranged according to FIG. 5 relative to the displacement encoder 19, emits an enable signal to the feed detector 20. The release signal is thus each given to the feed detector 20 when both toggle levers 41, 42 are in the upper position shown in FIGS. 3 and 5, where only the upper toggle lever 41 carries. If only one of the toggle levers moves downward, the circumferential recess 19 ′ shown in FIG. 5 comes into alignment with the displacement sensor 19, and the feed detector 20 receives a blocking signal, due to which the feed detector 20 switches the pressure source 30 via the switching device 21 makes impossible.
The function of the displacement mechanism described with reference to FIGS. 3 to 6 is as follows:
In the starting position shown in FIG. 3, the upper toggle lever 41 carries the associated support pin 43 which is supported on the lower rounding of a tooth recess 49, the entire displacement mechanism 17 and the bracket 14 acting on its underside at 77.
If the displacement mechanism 17 is now to be moved up one tooth, the pressure chamber 73 is pressurized via the hydraulic line 26 by the pressure source 30 (FIG. 2), whereupon the lower slide shoe 17b moves downward. This is possible because the knee joint axes 45, 46 were arranged at such a vertical distance from one another that the lower trunnion 44 is supported on the upper rounding 49 'of the second latching recess 49 following from the upper trunnion 43 downward. Now the entire length of the straight edge 49 Ber of the tooth recess 49 is available for a downward movement of the trunnion 44. This downward movement of the slide shoe 17b goes on until the support pin 44 on the lower quarter circle 49 'of the tooth recess 49 assigned at this moment comes to rest, whereupon the support pin 44 via the lower toggle lever 42 and the slide shoe 17b has the carrying function for that Displacement unit 17 and the connected displacement console 14 takes over. Due to the reaction force, the upper slide shoe 17a now moves upwards, until the upper trunnion 43 comes into contact with the upper quarter circle border 49 '. Nevertheless, the upward movement of the upper slide shoe 17a continues because, with the upper toggle lever arrangement 35 being folded slightly downwards, the upper support pin 43 can slide past the tooth 78 upwards until it snaps into the tooth recess 49 lying above it and at its upper quarter circle edge 49 ' comes to the plant.
Both toggle levers 41, 42 now assume the carrying position shown in FIGS. 3 and 5, in which the encoder cams 19 'are opposite the displacement sensors 19 - or rather angle sensors - so that an enable signal is emitted to the feed detector 20. A further advance of the displacement mechanisms 17 is therefore only possible if, after an advance by one tooth, all toggle levers 41, 42 have returned to their carrying position according to FIGS. 3 and 5. A further advance is thus prevented if one of the support pins 43, 44 is not properly engaged in the sliding teeth 25.
Finally, the piston 23 comes to rest against the lower stop 16, as a result of which a further upward movement of the sliding shoe 17a is avoided. At the same time, the pressure in the pressure chamber 73 increases and controls the switching device 21 via the hydraulic lines 26, 28 (FIG. 2) and the pressure switch 32 so that it reverses the pressure source 30 in the other direction of pressure generation.
Now pressure is given via line 27 (FIG. 3) into the lower pressure chamber 74 of the hydraulic cylinder 24, whereby the hydraulic cylinder is moved downward relative to the piston 23. As a result, because the displacement mechanism 17 is carried by the lower trunnion 44, the upper slide shoe 17a moves downward until its trunnion 43 comes to rest on the lower quarter circle edge 49 'of the associated tooth recess 49 and takes over the load. Thereupon, because the displacement mechanism 17 is now carried by the upper trunnion 43, the lower slide shoe 17b is moved upward until its trunnion 44 comes to rest on the upper quarter circle edge 49 'of the associated tooth recess 49. Now the lower toggle lever assembly 36 springs down until the trunnion 44 can run past the tooth 79 upwards and snaps into the tooth recess 49 located above it in order to come into contact with the upper quarter circle edge 49 'thereof. At this moment, the piston 23 abuts the upper stop 31 of the hydraulic cylinder 24, so that in A lower pressure build-up occurs in the lower pressure chamber 74, which again causes the pressure source 30 to be reversed in the manner described above (FIG. 2).
The displacement mechanism 17 has now been moved up one tooth, and the work cycle described is repeated periodically.
7 and 8 engages around the sliding bracket 14 leading guide sliding shoe 58 with two guide walls 80, 81 and a connection to the platform 14 'ensuring the rear wall 82, the webs 13' facing away from the webs 13 'of the mounting rail 13, the central web 13'˝ of the mounting rail 13 passes through a slot 84 located between the walls 80, 81. The guide shoe 58 surrounds the webs 13˝, 13'˝ with a clear play, which does not interfere, however, since when the guide shoe 58 is disengaged from the support shoe 11, that is to say it moves on the free part of the support rail 13, the walls 80, 81 by the weight of the sliding bracket 14 on the webs 13˝ in the sliding fit.
In the area of the support shoe 11, the guide slide shoe 58 has further support walls 85 which engage behind side projections 96 of the support shoe 11. 7 and 8 are at the top and bottom of the support walls 85 slightly inclined towards the wall 12 inclined surfaces 59 are provided, the inclination direction and size is such that when a guide shoe 58 with the walls 81, 80 on the webs 13˝ of the support rail 13 is pushed up on the support rail, the inclined surfaces 59 can engage with counter surfaces 60 on the lateral projections 96. When pushed up further, the guide sliding shoe 58 is pulled towards the wall by the inclined surfaces 59, as a result of which the walls 80, 81 lift off the webs 13 ′ and thus the support rail 13 release for a casual upward shift.
The lower inclined surfaces 59 (FIG. 7) are provided in order to transfer the load from the support rail 13 onto the support shoe when the guide slide shoe 58 is pushed onto the support shoe from above or when reloading from the support shoe 11 onto the support rail 13 when climbing into the next concreting section 11 bring about.
1 and 7 locking bar 64 is inserted through suitable transverse openings 64 'of the guide shoe 58, as soon as these transverse openings 64' are so far above the upper support shoe 11 that there is space for pushing through the locking bar 64. The locking bar 64 is supported on the top of the support shoe 11 and thus takes over the carrying of the sliding brackets as long as the mounting rail 13 is pushed up, or in the rest position when concreting.
If the support rail 13 is to be pushed upward when the shifting bracket 14 is anchored to the support shoes 11, the toggle lever arrangements 35, 36 according to FIG. 3 into the positions 35 ', 36' indicated by dashed lines are folded down by hand so that they are in relation to one Horizontal plane relative to the position shown in solid lines in FIG. 3 assume a mirror image arrangement. Now the reversible pressure source 30 again acts on the hydraulic cylinders 24, as was already the case when the shifting console 14 was pushed up gradually. Now, however, the shifting mechanisms 17 are supported on the shifting bracket 14 fixed to the support shoes 11, so that - due to the downward-tilted toggle lever arrangements 35 ', 36' - the support rails 13 are gradually raised until they reach the highest position in which the lower support pin 44 is located at the end of the sliding teeth 25. It is important that at the end of the shift toothing 25 the material of the mounting rail 13 is essentially flush with the tooth height, so that after the encoder cam 19˝˝ (FIG. 5) of the lower toggle lever 42 is no longer in alignment with the path - or angle encoder 19 comes, the further stroke of the mounting rail 13 is prevented.
As soon as the rail 13 has been moved into the next higher position and has hung itself with its upper end in a support shoe 11 arranged there, the two toggle lever arrangements 35, 36 can be pivoted up again into the position shown in solid lines in FIG. 3, whereupon the shifting mechanism 17 is again ready for the gradual lifting of the shifting bracket 14 in the next concreting section.
3, 5 and 6, an additional slide guide 87 can be provided at the upper end of the hydraulic cylinder 24 on the side facing the mounting rail 13, which engages around the web 13 'provided with the shift teeth 25 of the mounting rail 13 and the displacement movement of the displacement unit 17 stabilized on the mounting rail 13.

Claims

A displaceable platform which is movable section-wise on a wall, preferably upwardly, comprising support shoes (11) which are securable to the wall at specific intervals in the direction of movement, at least two carrying rails which are arranged spaced apart alongside one another and which extend along the wall (12) in each case between at least two support shoes (11), and at least one displaceable bracket arrangement (14) which is displaceable in the direction of movement and is securably arranged on at least two carrier rails (13) arranged alongside one another, wherein the carrier rails (13) are alternately first fixed to the support shoes (11) secured to the wall (12) and the displaceable bracket arrangement (14) is displaced by one section along the carrier rails (13) by means of a linear drive, essentially from the one end of the carrier rails (13) to the other end of the carrier rails, and is secured to the support shoes (11) secured to the wall, and the carrier rails (13) are thereupon released from the support shoes (11), are advanced by one section and are then once again fixed to further support shoes (11) secured to the wall (12), whereupon the sequence of working is repeated,
characterized in that a linear drive (15) is associated with each carrier rail (13) and advances the displaceable bracket arrangement (14) in the region of the associated carrier rails in steps (S) which are so small compared to the length L of a section that non-uniform displacements of adjacent linear drives (15) through preferably one and at most a few, in particular two or three steps (S) can still be tolerated by the elasticity and/or by the tolerances and/or by the relative play of the cooperating components; and in that all linear drives (15) are jointly driven and controlled from a common drive and control apparatus (22) in such a way that a further working step is first introduced when all linear drives (15) have preferably completed the preceding working step or one of the preceding few working steps.
Displaceable platform in accordance with claim 1,
characterized in that there is provided, on the displaceable bracket arrangement (14), in the region of each carrier rail (13), or at the displacement or support elements (17, 14') for the displaceable bracket arrangement (14) which are associated with each carrier rail (13), in each case one or two path transducers (19) which are connected with an advance detector (20) in which any step difference of neighbouring linear drives (15) is determined; and in that the advance detector (20), on finding the maximum permissible step difference between adjacent linear drives (15) switches off all linear drives (15) via a switching device (21), or first permits the next working step when the orderly advance of all the displaceable elements (17) by one or at most a few steps S has been determined via the path transducer (19).
Displaceable platform in accordance with claim 1 or claim 2,
characterized in that the displaceable element is formed as a displacement mechanism (17) by mounting the linear drive (15) on the displaceable element, which is displaceably arranged on the carrier rail (13) and which carries the displaceable bracket arrangement (14), with the linear drive acting between the carrier rail (13) and the displaceable element, wherein a toothed displacement rack (25) which extends in the direction of displacement and defines the steps (S) is in particular provided on the carrier rail (13), with the linear drive (15) and the displacement mechanism (17) being braced against the toothed displacement rack (25); and in that the linear drive (15) executes a stepwise displacement movement and in particular a climbing movement in accordance with the toothed displacement rack (25) and advances the displacement mechanism (17) by one tooth during each period of movement; in that the linear drive (15) is further preferably formed by a double acting hydraulic cylinder (24) provided with a piston (23); in that in accordance with a further embodiment two or more pressure chambers of the hydraulic cylinder (24) are connected via hydraulic lines (26, 27; 28, 29) to a pressure source (30) which is capable of being switched over; and in that the switching over of the pressure from pressure in one pressure chamber to pressure in the other pressure chamber is dependent on the piston displacement in the one or other direction; and in that advantageously two end stops (16, 31) are additionally provided in each hydraulic cylinder (24) for the piston (23) against which the piston (23) moves after executing the piston movement in the relevant direction; and in that a pressure switch (32, 33) is connected to each hydraulic line (26, 27 and 28, 29 respectively), preferably at the start of each branch line (28, 29), and initiates via the switching device (21) a change-over of the pressure source (30) when, after movement of all pistons (23) against the abutments (16 and 31 respectively), the relevant pressure switch (32 or 33 respectively), registers a sudden pressure rise caused thereby.
Displaceable platform in accordance with claim 3,
characterized in that the displacement mechanism (17) comprises two slide shoes (17a, 17b) which are slidably arranged in series on the carrier rail (13), with the double acting hydraulic cylinder (24) with the piston (23) being accommodated in one (17a) of these slide shoes and with a piston rod (34) which is secured to the piston (23) and which slidingly emerges from the hydraulic cylinder (24) acting on the other one (17b) of the two slide shoes; in that in accordance with an advantageous development a toggle lever (41, 42) is pivotally attached to each slide shoe (17a, 17b) via a toggle lever axle (45, 46) disposed perpendicular to the carrier rail (13) and extends from the toggle lever axle (45, 46) to the toothed displacement rack (25), where a carrier spigot (43, 44) extends from the toggle lever (42, 42) perpendicular to the plane of pivoting and parallel to the toggle lever axle (45, 46), with the carrier spigot having a complementary shape to the toothed recesses (49) of the toothed displacement rack (25) and standing out of engagement with the toothed displacement rack (25) in the position of the toggle lever (41, 42) perpendicular to the carrier rail (13), and also standing in engagement with the toothed displacement rack (25) in each position which is pivoted relative to the above named position through substantially less than 90° and in particular of the order of magnitude of 45°; and in that as a result of an elongate construction of the tooth recesses (49) the one or other carrier spigot (43, 44) can be selectively brought by a relative displacement of the slide shoes (17a, 17b) into a load carrying engagement with the toothed displacement rack (25) opposite to the displacement direction, whereby the respectively relieved carrier spigot (43 or 44) can be brought by displacement of the associated slide shoe (17a, 17b) in each case into the next tooth recess (49) in the displacement direction; wherein in particular each slide shoe (17a, 17b) carries an overlapping toggle lever arrangement (35, 36) consisting of a pivot lever (39, 40) and the toggle lever (41, 42), the pivot lever (39, 40) being likewise pivotally journalled on the slide shoe (17a, 17b) about a pivot lever axle (47, 48) which extends parallel to the toggle lever axle (45, 46) and is spaced therefrom, and each pivot lever (39, 40) containing a sliding member (52, 53) which slides along its longitudinal axis (50, 51) and is aligned with the toggle lever axle (37, 48), which coincides with the axis of the carrier spigot (43, 44) and which is pivotally connected to the carrier spigot (43, 44), and to the toggle lever (41, 42) about the toggle lever axle (37, 38); and in that the sliding member (52, 53) is expediently urged by a resilient force in the direction of the pivot lever axle (47, 48).
Displaceable platform in accordance with claim 4,
characterized in that the connection line (A) between the toggle lever axle (45, 46) and the pivot lever axle (47, 48) stands perpendicular to the longitudinal extent of the toothed displacement rack (25) or of the carrier rail (13).
Displaceable platform in accordance with claim 4 or claim 5,
characterized in that the pivot lever axle (47, 48) is further removed from the toothed displacement rack (25) than the toggle lever axle (45, 46); and in particular in that a guide bar (54) which extends parallel to the carrier rail (13) extends from the one slide shoe (17b) through a guide bore (55) of the other slide shoe (17a).
Displaceable platform in accordance with one of the claims 3 to 6,
characterized in that the lower end of the displaceable bracket arrangement (14) is connected to the displacement mechanism (17).
Displaceable platform in accordance with claim 2 and in accordance with one of the claims 4 to 7,
characterized in that a path or angle transducer (19) is associated with each toggle lever (41, 42) in such a way that an advance release signal is transmitted from the path transducer (19) to the advanced detector (20) only when the associated toggle lever (41 or 42 respectively) is located in that pivotal position (figure 3) in which the carrier spigot (43 or 44 respectively) arranged on it is latched into the tooth recesses (49) of the toothed displacement rack (25).
Displaceable platform in accordance with with one of the preceding claims,
characterized in that a carrier rail (13) has at its upper end region a carrier cam (56) which is pivotable towards the wall (12) and which is preferably suspended on its hinge (61), with the carrier cam (56) being able to enter into carrying engagement with a carrying surface (57) of a support shoe (11) when in a state pivoted towards the wall (12) and being able to move past the support shoe (11) on displacement of the carrier rail (13) when in the state pivoted away from the wall (12); with a resetting force expediently acting on the carrier cam (56) and biasing it towards the wall.
Displaceable platform in accordance with one of the preceding claims,
characterized in that a slidable guide shoe (58) which is arranged at a distance from the displacement element (17) in the direction of displacement, preferably at the top on the displaceable bracket arrangement (14), and which is normally slidingly arranged in the displacement direction on the carrier rail (13) with a specific play (S) to the wall, and/or the support shoe (11) which is secured to the wall (12), has oblique surfaces (59) which are slightly inclined relative to the direction of displacement (R) and which cooperate with countersurfaces (60) of the support shoe (11), or of the slidable guide shoe (58) respectively, in such a way that on pushing the slidable guide shoe (58) onto a support shoe (11) the inclined surfaces (59) and the countersurfaces (60) enter into engagement and the slidable guide shoe (58) is brought out of sliding engagement with the carrier rail (13), and/or in that the toggle lever arrangements (35, 36) can be folded over into the opposite direction into a mirror image position; and in that in this position, after securing the displaceable bracket arrangement (14) directly to the support shoes (11), and after releasing the carrier rail (13) from the slidable guide shoe (58), the guide rail can be displaced upwardly in steps to the next concreting level by actuating of the pressure source (30) which can be switched over.