CZ74296A3 - Scaffold frame with hydraulic adjustment of height - Google Patents

Abstract

The staging has support feet (2) fixed to the sides of the frame members, also lower and upper cross-members. A girder (5) supporting the load platform is adjustable for height in the frame members, while the bottom cross-member is supported by a hydraulic ram (7). A further foot (2, 1) accommodates a travel wheel (8), and a fixing device is included for a working platform (9). The staging is one of several in a set and spaced apart, providing load and working platforms of the same and predetermined heights. The working height is continuously and evenly variable under load, using the rams. These are supplied by an external hydraulic unit with gear-type quantity distributor. Each ram has a valve for holding the load, this being typically in the end cover (10) of the ram cylinder. The travel wheel can be a twin one on a common axle, to avoid tipping sideways when in transit.

Description

Scaffolding stand with hydraulic height adjustment

Technical field

BACKGROUND OF THE INVENTION The invention relates to a scaffolding frame with a hydraulic height adjustment comprising a frame on which columns, which are connected to each other by a lower crossbeam and an upper crossbeam, are attached laterally extending support feet and a frontly extending wheel foot with wheels. slidingly mounted side guide rods of the floor beam with adjustable height provided with fastening means for the working platform and a hydraulic cylinder is supported on the lower cross member.

BACKGROUND OF THE INVENTION

Working scaffolds are known, for example in the form of platform scaffolds with a height adjustment of the working or support platform by means of a crank.

In such working or support platforms with a crank adjustment, a height-adjustable element is provided in the frame of the scaffolding rack in the manner of a telescopic guide, which is driven by a crank which interacts with the shaft. For this purpose, the height-adjustable element is provided with recesses with mutual spacing in which the gear engages on the shaft of the drive element. The drive mechanism is required for each height-adjustable element and the scaffold height adjustment can only be carried out manually and without loading the scaffolding, so that when using such a scaffold tower, for example when building a wall, the working process must be repeatedly interrupted.

German Utility Model No. G 94 01 407 discloses a height-adjustable scaffolding stand with a lower tubular frame and a retractable upper part, the height adjustment itself being carried out by means of a hydraulic cylinder and a piston. The required hydraulic cylinder is integrated into the frame structure and is driven by an external power unit so that the scaffold height adjustment can be carried out under load. The frame structure is further provided with a wheel so that the individual scaffolding stands can be easily moved manually to another place of use. The scaffolding stand is also fitted with a folding safety rail and a working platform with adjustable height.

Although the height-adjustable scaffolding stand described in German utility model No. G 94 01 407 can be used to adjust the height of the scaffolding under load, it takes a lot of time to adjust the height of the large working area along the building to be maintained. and skills in operating or activating individual hydraulic cylinders. In addition, it has been shown that while the known traveling wheel makes it much easier to move the scaffolding stand, depending on the center of gravity of the scaffolding stand, the scaffolding stand may be overturned or tilted, jeopardizing the safety of the work.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to further improve the known scaffolding frame design with hydraulic height adjustment so as to increase the safety and productivity of the scaffolding frame and to simplify the operation of the scaffolding height adjustment and adjustment as much as possible.

SUMMARY OF THE INVENTION

The problem is solved and the drawbacks of the known scaffolding stands of this kind are largely overcome by the scaffolding stand according to the invention, which is characterized in that the scaffolding stands are assembled in a group comprising at least two scaffolding stands to create arbitrary support or work surfaces. a height which is infinitely variable even under load by activating the respective hydraulic cylinders by means of a hydraulic power unit with a dispenser of hydraulic fluid on the principle of gear wheels or the like, the individual hydraulic cylinders having adjusting valves.

The adjusting valve is preferably incorporated in the bottom of the hydraulic cylinder and the wheel is formed by a pair of wheels on a common axis to prevent lateral tipping when moving the scaffolding stand.

Advantageously, the deck girder is provided with means for receiving a folding safety rail, which in the transported or lowered position is secured to the columns of the frame and its components form a transport handle to facilitate the displacement of the scaffolding stand on a pair of wheels.

Furthermore, it is advantageous if the floor beam is provided with lockable and replaceable adaptation pads for fixing and attaching the various floorboards in the lateral direction, wherein a locking bracket is provided on the folding safety rail which secures the floor frame or the floor to the floor rail.

In addition, it is preferred that the hydraulic cylinder is secured to the upper cross beam by a bracket or the like that surrounds the hydraulic cylinder, and the hydraulic piston of the hydraulic cylinder is articulated to the floor beam substantially midway along the length of the floor beam, arranged detachably by means of a support bracket.

Furthermore, it is advantageous if hydraulic fluid connection elements are provided at the bottom of the hydraulic cylinder substantially in the width of the lower crossbeam, which are protected against mechanical damage by this lower crossbeam, with the necessary hydraulic lines abutting to the outer peripheral surface of the hydraulic cylinder and The beam and the upper cross beam are at a safety distance in the retracted, lowered position of this floor beam.

It is therefore an essential basic idea of the invention that the scaffolding stand with hydraulic height adjustment is mounted such that the scaffolding stands are spaced apart from one another in a group comprising at least two scaffolding stands, so that virtually any supporting or working surface is created in advance the same working height. This support or working surface is continuously adjustable even under load, even by means of a remote control, so that the respective hydraulic cylinders are activated by means of a hydraulic unit with a hydraulic fluid dispenser or the like. Each of the individual hydraulic cylinders is additionally provided with an adjusting valve so that even the selected working height is maintained even after the hydraulic power unit has been switched off or disconnected. Said adjusting valve is preferably incorporated in the bottom of the hydraulic cylinder.

By means of a hydraulic fluid dispenser on the principle of gear wheels, it is ensured that a given, predetermined quantity of hydraulic fluid is always applied to a given hydraulic piston when the hydraulic cylinders are of the same size, so that even height adjustment of the floor beams is achieved.

As a result, there is no longer any need for manually adjusting the height of the individual scaffolding stands, which can be high on large working surfaces.

It is also within the scope of the invention that individual hydraulic cylinders can be controlled and adjusted to compensate for height, for example in case of uneven terrain on which the scaffolding stands are built.

Another basic idea of the invention is that the wheel is designed as a double wheel on a common axis to prevent lateral tipping when moving the scaffolding stand.

For optimum work safety, the floor beam is provided with means for attaching a collapsible safety rail that is attached to the columns of the frame in a transported or tilted position and forms a transport handle for moving the scaffolding stand to a pair of wheels more easily.

The floor beam is provided with lockable and replaceable adaptation pads, thereby securing and attaching the various shims in the lateral direction, without the need for costly modifications to the scaffolding stand itself.

The folding safety rail is provided with a locking bracket which, when the safety rail is in the working position, secures the floor frame or the floor on the floor beam against tilting in the vertical direction.

In a further preferred embodiment of the scaffolding stand according to the invention, the hydraulic cylinder is arranged approximately centrally on the lower crossbeam and guided on the upper crossbeam, so that a single hydraulic cylinder achieves telescopic extension and retraction of the floor beam which is movably guided in the columns of the frame.

In another preferred embodiment of the scaffolding stand according to the invention, the hydraulic piston of the hydraulic cylinder with the floor beam is articulated substantially in the middle of the length of the floor beam, thereby achieving an undisturbed adjustment of the height of the floor beam so that lowering the floor beam.

At the bottom of the hydraulic cylinder there are arranged in the width of the lower crossbeam hydraulic fluid connection elements, which are protected by this lower crossbeam against mechanical damage, taking into account the conditions on the construction site. The necessary hydraulic lines are closely adjacent to the outer peripheral surface of the hydraulic cylinder, so that the risk of damage, especially mechanical damage, is also reduced.

A safety distance is provided between the floor beam and the upper transverse beam in the retracted, lowered position of the floor beam to prevent injury from pinching of body parts, in particular the head or torso.

This safety distance is in the preferred embodiment of the scaffolding stand according to the invention approximately 20 cm.

The scaffolding stand according to the invention makes it possible to lock the floor beam at any height, even if the hydraulic power unit is not connected, by means of a special hydraulic cylinder which is provided with an adjusting valve in its lower part. Thus, the locking of the height of the floor beam is ensured in every position and under all circumstances by reliable technical means.

Due to the traveling wheel according to the invention, which is designed as a twin wheel, the scaffolding stand is prevented from overturning when the scaffolding stand, the stand and the operator are lifted and driven.

The safety rail, which can be fixed in a downward position, for example by means of a connecting pin, makes it possible to use its parts, namely means for suspending the transverse struts of the safety rail as a handle. These handles are used for easy movement with individual scaffolding stands using the aforementioned double castor wheel. According to the invention, furthermore, on the longitudinal struts facing away from this wheel, there are provided fastening devices for attaching the cross struts, possibly with an adjustable length, which connect the scaffolding stands to each other and thus secure them against slipping. The length adjustment allows the distance between the scaffolding stands to be varied, thus increasing the loadability of the scaffolding as well as the use of different dimensions.

According to the invention, substantially opposite openings are provided in the floor beam, which serve to lock the adapter pads for the most varied floor plates. These adapter pads have, for example, a triangular or semi-circular cross-section, so that it is possible to reliably secure the skids or mounting plates from a wide variety of scaffolding manufacturers without having to make any design modifications to the hydraulic scaffolding stand itself.

In a further embodiment of the scaffolding stand according to the invention, the attachment of the hydraulic cylinder to the upper crossbeam is provided by a U-shaped yoke that surrounds the upper crossbeam. This increases the lateral tilt stability if the loading forces act obliquely from above.

In another embodiment of the scaffolding stand according to the invention, the lateral guide rods have telescopically inserted into the posts of a substantially rectangular or square cross section.

A particular advantage of the invention is the possibility of constructing a large working surface which, when using the intermediate pieces, can continue at a corner or at another angle or can form a large continuous surface.

By using a hydraulic power unit with a hydraulic fluid dispenser on the principle of gear wheels, a uniform lifting or lowering of this surface is ensured, which can be essentially any shape.

Moreover, the scaffolding stand according to the invention can also be used for lifting beams and the like up to the ceiling area without the need for cranes or other lifting devices for this purpose.

Similarly, such lifting devices cannot in most cases be used without restriction in the renovation of old buildings, since the known cranes or hydraulic lifting platforms cannot be transported inside and installed there.

The existing support angles for attaching the working platform or the footbridge which rests on the working platform are designed such that their lining or projection, like in the case of a safety railing, provides a floor or planks on it. The working platform beam itself is height adjustable by snapping in holes or hydraulically.

The actuation of the plurality of hydraulic cylinders according to the invention takes place evenly, and the hydraulic cylinders can also be individually controlled, so that an equalization of the height of the working platform can be achieved, for example if the scaffolding stands are mounted on an uneven surface.

The hydraulic unit used can be easily moved and can be used to control several groups of hydraulic scaffolding stands or hydraulic cylinders of these scaffolding stands. In addition, the hydraulic unit can also be operated remotely, so that a construction worker who is currently working on a floor carried by hydraulic scaffolding stands can remotely adjust the height of the scaffolding stand or scaffolding stands.

As already mentioned, the hydraulic scaffolding stand is lowered only to a certain end position, so that there is no danger to persons who may be under it.

The hydraulic scaffolding stands according to the invention take up minimal space, are essentially portable and can be set up or dismantled by a single person. Furthermore, due to the easy displacement of these scaffolding stands, these scaffolding stands can be replaced with lifting platforms which cannot be used in some places. This may be useful, for example, if the formwork is to be provided from below or the beams are to be retrofitted.

The hydraulic power unit, which is equipped with a hydraulic fluid dispenser on the principle of gear wheels, can be designed such that by switching, for example, ball valves, it can be brought into a state such that it can drive more work platforms on large buildings.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated by the following non-limiting examples, which are described in the accompanying drawings, which show:

FIG. 1a shows a scaffold stand with hydraulic height adjustment according to the invention in a side view,

FIG. 1a shows a section along line A - A in FIG. 1a, and

FIG. 2 is a section along line B - B in FIG. 1a.

DETAILED DESCRIPTION OF THE INVENTION

In the illustrated embodiment of the scaffolding stand with hydraulic height adjustment, a frame 1 is used, which is provided with pillars 6 at the sides. These pillars 6 are connected to each other by a lower crossbeam 3 and in the upper part by an upper crossbeam 4.

The columns 6 are preferably made of a rectangular or square hollow profile. In the lower region of the frame 1, support legs 2 are arranged on the columns 6 or on the lower cross member 3. The laterally extending width of the wheel shoe 2.1, which is provided with a pair of wheels 8 on a common axis, serves to facilitate displacement of the scaffolding stand.

The floor beam 5 is provided with lateral guide rods which cooperate telescopically with the columns 6. The profile of these lateral guide rods corresponds with the clearance of the inner profile of the columns 6.

As a result, the floor beam 5 is movably and vertically adjustable and guided in the columns 6 by means of said lateral guide bars.

A hydraulic cylinder 7 is supported on the lower cross member 3.

On the upper crossbeam 4, the hydraulic cylinder 7 is fixed in the lateral direction by means of a yoke 15.

A hydraulic piston 7 extends from the hydraulic cylinder 7 itself.

The hydraulic piston 70 is movably connected to the floor beam 5 by means of a joint, near its center in the width direction of the scaffolding frame 1.

The hydraulic fluid injected into the hydraulic cylinder 7 forces the hydraulic piston 70 upwards, thereby adjusting the height of the floor beam 5.

Applying pressure or dropping the pressure in the opposite direction leads to the shifting of the floor beam 5 downwards.

The adjusting valve, which is arranged inside the hydraulic cylinder 7, ensures that the height of the floor beam 5 is maintained even when there is no longer external pressure or in case of pressure loss. Said adjusting valve is preferably arranged in the bottom 10 of the hydraulic cylinder 7.

Means 9.3 for securing the working platform 9 are additionally arranged laterally on the floor beam 5.

These means 9.3 for attaching the work platform 9 are designed so that the support brackets 9.1 for the work platform 9 can be removed, rotated by their booms 9.2 by 180 degrees and slid in from above and secured so that the boom 9.2 is locked above the floor beam 5, thereby achieving a reduction in the volume of the scaffolding stand 1 in the transport state - this position of the boom 9.2 is shown in dashed lines in FIG.

A safety distance A is preset between the upper crossbeam 4 and the floor beam 5 by a corresponding design dimension, so that the construction satisfies the safety regulations.

On the side opposite to the means 9 for attaching the working platform 9, a safety rail 11 is pivoted or tiltable on the floor beam 5. This safety rail 11 can be folded down and locked in this position during transport of the scaffolding rack 1 so that the components 12 of this safety rail 11 can then serve as a handle for lifting and traveling with the scaffolding stand on the wheels 8. In this way, the scaffolding stand can be easily moved by one person, which is often needed. A locking bracket 14 is further provided on the safety rail který, which in the upright position of the safety rail 11 prevents the floor frame and / or the floor placed thereon from tipping over.

Plug-in adapter pads 13 are interchangeably locked on the floor beam 5, on which various floor plates can be mounted, which are thus fixed in the lateral direction. By means of their corresponding shape, these adapters 13 form the optimal abutment surfaces for the respective mats.

The hydraulic fluid connection elements 15 are disposed at the bottom 10 of the hydraulic cylinder 7 substantially in the width of the lower cross-member 3, so that the hydraulic elements 15 are largely protected against mechanical damage.

The necessary hydraulic lines 16 abut against the outer circumference of the hydraulic cylinder 7, so that the risk of damage to them is also reduced.

Adjustable length cross-brace cross-braces are not shown in the drawings, which, in the case of multiple platforms, secure each other against lateral displacement or forcing under load.

In an exemplary embodiment of the invention, six hydraulic scaffolding stands are connected to one common unit with a hydraulic-fluid dispenser based on the gear-wheel principle, which are thus evenly supplied with pressurized hydraulic fluid. This creates a large, continuous flat platform or work surface so that a wall of the same length can be built or repaired in one shot. Due to the possible remote control of the height adjustment of the hydraulic scaffolding stands, construction workers do not have to leave the work platform so that the efficiency of the work process can be increased.

The remote control is provided by the electric control of the solenoid valves of the hydraulic power unit.

By means of the scaffolding stands according to the invention, a large or even angled working surface can be constructed, which can be evenly raised or lowered by means of the described hydraulic system.

The hydraulic scaffolding stands according to the invention are also suitable for lifting beams or the like up to the ceiling area without the need for cranes or other lifting devices for this purpose. This is particularly advantageous, for example, in adaptations and renovations inside old buildings, where space is limited in the already enclosed space.

The individual scaffolding stands can be easily moved or stored with minimum requirements for passage size or space requirements when the hydraulic piston 70 and the safety rail 11 are lowered.

The achievable load capacity in the exemplary embodiment is approximately 1500 kg per scaffolding stand, so that a scaffold of group 5 is achieved at a spacing of 2.5 m between the scaffolding stands.

Instead of the hydraulic fluid dispenser on the principle of gear wheels, the supply of predetermined equal amounts of hydraulic fluid to the individual hydraulic cylinders 7 can also be ensured by electronic regulation, which also achieves the desired uniform adjustment of the height of the floor beams 5.

FIG. 2, which is a section along the line B - B in FIG. 1, shows the extremely narrow design of the hydraulic scaffolding stand and the arrangement of the hydraulic cylinder 7 between the deck girder 5 and the lower cross girder 3. FIG.

The laterally protruding support feet 2 are also clearly visible in FIG.

Fig. 1b shows a cross-sectional view of the scaffolding stand in the plane A-A of Fig. 1, with the same parts being designated with the same reference numerals as in the other figures.

Claims (11)

PATENT CLAIMS A scaffold stand with a hydraulic height adjustment consisting of a frame on whose columns, which are connected to each other by the lower crossbeam and the upper crossbeam, are laterally protruding support feet and a frontly protruding wheel foot with wheels, movable in the frame columns the side rails of the adjustable beam with adjustable height provided with fastening means for the working platform and the lower cross-member supported by a hydraulic cylinder, characterized in that the scaffolding stands are assembled in a group comprising at least two scaffolding stands to create any supporting or working surfaces o currently preset equal working height, which can be continuously adjusted evenly under load by activating the respective hydraulic cylinders (7) by means of a hydraulic unit with a hydraulic metering unit gear fluids or the like, the individual hydraulic cylinders (7) being provided with check valves. Scaffolding stand according to claim 1, characterized in that the adjusting valve is incorporated in the bottom (10) of the hydraulic cylinder (7). Scaffolding stand according to claim 1 or 2, characterized in that the wheel (8) is formed by a pair of wheels (8) on a common axis to prevent lateral tipping when the scaffolding stand is moved. Scaffolding stand according to any one of the preceding claims, characterized in that the floor beam (5) is provided with means for attaching a folding safety rail (11), which is secured to the columns (6) of the frame (1) in the transported or folded position; its components (12) form a transport arm to facilitate moving the scaffolding stand onto a pair of wheels (8). Scaffolding stand according to one of the preceding claims, characterized in that the floor beam (5) is provided with lockable and replaceable adaptation pads (13) for fixing and attaching the various shims in the lateral direction. Scaffolding stand according to claims 4 and 5, characterized in that a securing bracket (14) is provided on the folding safety rail (11), which secures the floor frame or the floor on the floor beam (5) in the working position of the safety rail (11). . Scaffolding stand according to any one of the preceding claims, characterized in that the hydraulic cylinder (7) is secured to the upper cross-member (4) by means of a yoke (15) or the like which surrounds the hydraulic cylinder (7). Scaffolding stand according to one of the preceding claims, characterized in that the hydraulic piston (70) of the hydraulic cylinder (7) is articulated to the floor beam (5) substantially in the middle of the length of the floor beam (5). Scaffolding stand according to one of the preceding claims, characterized in that the working platform (9) is detachably arranged on the floor beam (5) by means of a support bracket (9.1). Scaffolding stand according to one of the preceding claims, characterized in that on the bottom (10) of the hydraulic cylinder (7) substantially hydraulic width connecting elements (15) are arranged in the width of the lower cross-member (3), which are the lower The cross-member (3) is protected against mechanical damage, the necessary hydraulic lines (16) being adjacent to the outer peripheral surface of the hydraulic cylinder (7). Scaffolding stand according to any one of the preceding claims, characterized in that there is a safety distance (A) between the floor beam (5) and the upper cross beam (4) in the retracted, lowered position of the floor beam (5).