EP1008550B1 - Mechanical arrangement for limiting the movement of working platforms - Google Patents

Abstract

Drivers (285,286) fitted both sides of the lever (28) in its swivel plane contact a stop plate (291) to reach the working settings so as to adjust the plate and in this way shift a cam (343,344) out of normal into working position in which the rope (17,18) is pressed against the pulley (22,23). The drivers come in pin form and the stop plates (291) are fixed to a slide (29) which is fitted at its ends with latching plates (33) and so acts on the cams. The cam is mounted on a shaft taking a pin (341) which normally enters the latching plate itself adjusting parallel to the pin. Preferably a pair of pulleys are provided and are exposed to a pair of cams mounted on the shaft.

Description

The invention relates to a mechanical arrangement for limiting the Movement of work platforms, especially to limit the inclination, according to the genus of claims.

U.S. Patent No. 3,865,265 includes safety accessories for load carts with an elevator, in which an inclination measurement with a Pendulum potentiometer is carried out. The European standard prEN 1808, however, calls for the prevention of excessive inclinations of Working platforms without electrical auxiliary devices, which limit the inclination to 14 degrees. Such mechanical Tilt limitation arrangements are realized on work platforms, at which the winches are attached to the front sides.

An arrangement of this type known from practice is in the cable winch integrated and is triggered by a lever that when tilted the working platform due to the vertical due to its own weight hanging safety rope is triggered. The disadvantage of this Arrangement that the triggering of the clamping only at one Inclination direction is possible and the winches in the case of the C-bracket arrangement must be installed rotated by 180 ° to each other, which creates the risk of confusing the winches during assembly given is.

A safety device (Skylock) is also available Tilt limit for working platforms known as separate Assembly is not integrated in the winch. The clamping is at this safety device triggered when one at the top of the Skylocks arranged sliding plate through the safety rope The work platform is tilted to the left or right. The Disadvantage of this and similar facilities is that Using C-shaped bracket arrangements no deflection of the Rope in the rope section between the roller head and the winch is possible; Both function groups do not shift when the stage is inclined to each other.

The object of the invention is to provide a simple arrangement that the inclination of the working platform, especially its longitudinal inclination limit and which are also primarily at the Use of C-brackets and their equidirectional attachment works in any direction.

According to the invention, this object is achieved by the characterizing Features of the first claim solved The attachment of the driver on both sides of the lever center line, preferably at the same distance from the center line and from the lever swivel axis, is the arrangement according to the invention regardless of the direction of inclination effective in the longitudinal direction of the work platform in the same way. The lever itself is pivoted at one of its ends and is on at the other end from the rope, preferably from the suspension rope, or from the ropes (Supporting rope and safety rope) guided and swiveled. For this, the Lever cranked at this end and with recesses for the rope / the Ropes. The recesses can be a much larger one Diameter than the ropes, so that the lever from the rope / Ropes are only moved when they rest on the edge of the recess, if So the work platform has reached a certain longitudinal inclination (10 ° - 14 °). The drivers are advantageously designed as pins and on a cross attached to the lever directed, connected to this support arm; she interact with a slider that is close to one of its End is provided with a locking plate that acts on the eccentric. The eccentric is conveniently attached to a shaft into which an in Normal position in the locking plate protruding pin is firmly inserted. The locking plate is essentially parallel to the pin with the slide or adjustable to the lever. Is advantageous for the leadership at least one pair of rollers is provided for the carrying rope and the securing rope, that has guide grooves for the ropes along the circumferences of the rollers and with which an eccentric pair cooperates, that with at least one Locking pin is rigidly arranged on a shaft. At least that is a locking pin is located approximately in the middle of the shaft and protrudes at the middle or Normal position in corresponding recesses in the locking plate into it. Reset levers are provided at the ends of the shaft, via which after appropriate setup of the working platform Limiting device returned to the normal position can be. This is in accordance with the safety regulations Independence of the arrangement according to the invention from auxiliary energy and automated systems guaranteed.

Fig. 1

eine Arbeitsbühne mit C-Bügeln in einer Haupt- oder Frontansicht,

Fig. 2

einen C-Bügel in Seitenansicht,

Fig. 3

die wesentlichen Bauteile eines Rollenkopfes, in einem Längsschnitt dargestellt,

Fig.4

einen Ausschnitt aus Fig. 3, in dem sich die Exzenter in Klemmstellung befinden, und

Fig. 5

einen Schnitt entlang einer Linie A-A in Fig. 3.

The invention is explained below with reference to the schematic drawing. Starting from a main application, the details of the invention and its mode of operation are described in more detail.
Show it:

Fig. 1

a working platform with C-frames in a main or front view,

Fig. 2

a C-bracket in side view,

Fig. 3

the essential components of a roller head, shown in a longitudinal section,

Figure 4

a section of Fig. 3, in which the eccentrics are in the clamping position, and

Fig. 5

3 shows a section along a line AA in FIG. 3.

In Fig. 1 the outline of a work platform 10 is shown, which is in two C-frame 11, 12 hung and connected to them. Each of the C-brackets 11, 12 is with a roller head 13 or 14 and a winch 15 or 16 provided and suspended on ropes 17, 18 and 19, 20. The ropes 17, 19 are carrying ropes and the ropes 18, 20 safety ropes. By pressing the Winches 15, 16 along the work platform 10 in the vertical direction a building wall, not shown, adjustable. There is the Possibility of inclining the work platform 10 in its longitudinal direction; the means that the end of the near the C-bracket 11 Work platform 10 is at a different height than nearby end of the C-bracket 12. If this tendency exceeds one certain amount, for example fourteen degrees of angle, the inclination can change slowly, so occurs according to the invention Limiting arrangement in action that does not have a further inclination allows and can only be solved manually for security reasons. This limitation arrangement is described with reference to FIGS. 3 and 4.

In Fig. 2, a C-shaped bracket, for example. The bracket 11 is shown, the inclined roller head 13 as a housing for the invention Limiting arrangement 21 and at least one pair of deflection rollers 22, 23 is designed for the ropes 17, 18. The ropes are removed from the pulleys approximately parallel to a vertical component 111 of the bracket 11 of the winch 15 fed, which realizes the vertical movement of the C-bracket 11. At the lower, the roller head 13 opposite end of Vertical component 111 is a support 112 for the work platform, which are substantially perpendicular to the vertical member 111 and parallel is directed to the roller head 13. The ropes 17, 18 can be outside or fed to the winch 15 within the vertical bracket component 111 become.

In FIGS. 3 to 5, a pair of deflecting rollers 22, 23 for a support cable 17 and a safety cable 18 is rotatably mounted in the housing 13 about an axis XX. The deflection rollers 22, 23 are provided on their peripheral surfaces with grooves 221, 231 for the defined guiding of the ropes 17, 18. The rollers 22, 23 can be connected to one another separately or in a rotationally rigid manner, can be mounted with an axis or rotatable about an axis, and they can preferably have the same or different diameters. In Fig. 3, the deflection roller 22 covers the deflection roller 23, which is why the reference numerals for the latter and the groove 231 are placed in brackets. Parallel to the pair of rollers 22, 23 and transversely to the axis XX, support arms 24, 42 are firmly provided between the pair of rollers and each side housing wall 131, 133, which are supported on the one hand on a physical axis 25 and on the other hand on a holding rod 26 between the housing walls 131, 133 ,
On a housing wall 132, which is oriented at right angles in FIG. 3 and parallel to the plane of the drawing in FIG. 4, a lever 28 is pivotally mounted in a bearing 27 about an axis YY at one end with a pin 281, which cranked at the other end and has corresponding guide recesses 282, 283 for the ropes 17, 18. The axis YY is directed essentially at right angles to the housing wall 132 and to the axis XX. Preferably in the vicinity of the pin 281, on the side of the lever 28 facing away from the pin there is a support arm 284 which extends transversely to the lever and parallel to the lever pivot plane and has driver pins 285, 286 or driver edges arranged parallel to the axis YY at its ends. These driver pins interact with a stop plate 291, which is attached on both sides of a slide 29. The ends of the slide 29 are non-rotatable in slide bearings 292, 293 and can be displaced essentially parallel to the fixed housing walls 131, 132, the upper slide bearing 293 being located in a rod-shaped bearing component 30 arranged fixed to the housing and the lower slide bearing 292 in one console 31 fastened to the housing wall 132.
A helical spring 32, which supports against the housing-fixed bearing component 30 and the plunger-fixed stop plate 291 and surrounds the slide 29, has the effect that, depending on the pivoting of the lever 28 about the axis YY, the stop plate 291 always only with one of the pins (one of the edges) 285 , 286 is in contact. At the lower end of the slider 29, a rigid sheet or a locking plate 33 is fastened with a recess 331 for a locking pin 341 above the bracket 31, which is rigidly connected to a shaft, preferably a hollow shaft 34, which can be pivoted about an axis ZZ. The shaft 34 mounted in and between the housing walls 131, 133 is further provided with eccentric disks 343, 344 between the housing walls 131 and 133 and at its ends outside the housing 13 with adjusting levers 345, 346. These protrude with pins 347, 348 from both sides into the hollow shaft 34, which is pinned to the pins 347, 348. The locking pin 341 is guided through an elongated hole 311 located in the bracket 31 and directed at right angles to the housing wall 132, the hole walls located near the housing wall 132 serving at the same time to limit the pivoting range of the pin 341 and thus the shaft 34.
Drawbars 35, 36 are articulated at one end to the eccentric disks 343, 344 and are supported against support arms 24, 42 by means of helical springs 37, 38. The helical springs 37 and 38 surround the tie rods 35 and 36 between a stop nut 243, 244 screwed onto their free ends and adjustable to adjust the spring tension and the associated support arm 24, 42. The articulation points of the tie rods 35, 36 are located on the eccentric discs 343, 344 in the normal position near the housing wall 132.

The limiting arrangement 21 comprises according to the above in essentially the lever 28, the slider 29, the console 31, the Locking plate 33, the shaft 34 with the pin 341 and the eccentric discs 343 and 344, the tie rods 35, 36 and the support arms 24, 42. In there is such a roller head 13, 14 Limiting arrangement 21.

In the normal or center position N, the lever 28 is in the in Figures 3 and 4 position, the ropes 17, 18 (or 19, 20) run essentially centrally through the guide recesses 282, 283, the coil spring 32 presses the stop plate 291 against both Driving pins 285, 286, the locking plate 33 holds the locking pin 341 in it Recess 331 and thus the eccentric discs 343, 344 against Effects of the coil springs 37, 38 and tie rods 35, 36 in their shown location. The components also remain in this position, if the ropes 17, 18 in the direction of a double arrow 39 around one determinable amount slightly, for example 14 degrees, from which Normal position N deviate. Only when by swiveling the Lever 28 only a driver pin 285 or 286 against the stop plate 291 pushes the slide 29 against the coil spring 32 upwards presses and raises the locking plate 33 enough so that the locking pin 341 from the recess 331 through the action of the springs 37, 38 can slide out, the eccentrics 343, 344 through the tie rods 35, 36 pulled into the (end) position shown in Fig. 4, in which they Block ropes 17, 18. The are in this end position Articulation points of the tie rods 35, 36 in the vicinity of the rope pulleys 17, 18; and the greater eccentricity of the eccentrics 343, 344 presses the ropes 17, 18 against the rollers 17, 18. It does not matter whether the lever 28 in the one or the other direction of the double arrow 39 is pivoted. The Blocking occurs due to the action of the driver pins 285, 286 always in the same way. It is also easy to see that the train Support ropes 17, 19 in the direction of an arrow + y the contact pressure of the Eccentric 343, 344 reinforced on the ropes 17 and 18 and vice versa at Pull the suspension cables in the direction of an arrow -y the contact pressure reduced. By turning the when pressing the ropes 17, 18 from the in the position shown in Figures 3 and 4 by about 90 ° adjusted lever 345, 346 in the direction -y the shaft 34 and thus the eccentric 343, 344 returned to the normal position N, in which the pin 341 again takes its rest position in the recess 331.

Instead of against a holding rod 26, the support arms 24, 42 can also support against pins fastened in the housing walls 131, 133. It is also possible with only one pull rod and one support arm get along between the eccentric discs 343 and 344. To the The driver pins 285, 286 can also be a single one Take along element of sufficient width, the side edges then act on the stop plate 291. Also with regard to the design of the Rotating, locking and swiveling elements, the assignment of the individual Elements to each other and to the housing 13, the invention is diverse variable.

LIST OF REFERENCE NUMBERS

10

platform

11, 12

hanger

13, 14

roller heads

15, 16

wind

17, 18, 19, 20

ropes

21

limiting arrangement

22, 23

deflection rollers

24.42

support arms

25

physical axis

26

retaining bar

27

camp

28

lever

29

pusher

30

bearing component

31

console

32, 37, 38

coil springs

33

detent plate

34

wave

35, 36

drawbars

39

Doppelfpeil

131, 132, 133

housing walls

221, 231

groove

243, 244

stop nuts

281

journal

282, 283

guide recesses

284

Beam

285, 286

driving pins

291

stop plate

292, 293

bearings

311

Long hole

331

recess

341

Plunger

343, 344

eccentric

345, 346

lever

347, 348

spigot

+ y, -y

Arrows

N

Center or normal position

X-X, Y-Y, Z-Z

(Rotating or swiveling) axes

Claims (7)

1. Mechanical arrangement for limiting the tilt of working platforms (10), comprising a lever (28), a pulley (22, 23), entraining members (285, 286), a plate (291) and at least one cam (343, 344), wherein the lever (28) is deflected from its normal position to a working position by at least one cable (17, 18) which is run over the pulley (22, 23) and, in the process, the lever (28) causes the cable (17, 18) to be clamped, characterised in that the entraining members (285, 286) are fastened to the lever (28) on the two sides of its centreline in its plane of pivot, of which entraining members (285, 286) one at the given time contacts and displaces the plate (291) to cause the working position to be reached, which plate (291), when displaced, releases at least one cam (343, 344) to move from its normal position to its working position, in which it presses the cable (17, 18) against the pulley (22, 23).
2. Arrangement according to claim 1, characterised in that the entraining members (285, 286) are in the form of pins and in that the plate (291) is fastened to a slider which, in the vicinity of one of its ends, is provided with a locking plate (33) which acts on the cam (343, 344).
3. Arrangement according to claim 2, characterised in that the cam (343, 344) is fastened in place on a shaft (34) into which a locking pin (341) which, in its normal position, projects into the locking plate is solidly inset, and in that the locking plate (33) is arranged to be displaceable with the slider (29) substantially parallel to the locking pin (341).
4. Arrangement according to claim 1, characterised in that a pair of pulleys (22, 23) are provided, on which a pair of cams (343, 344) mounted on a shaft (34) act.
5. Arrangement according to claim 4, characterised in that setting levers (345, 346) are fastened to the ends of the shaft (34).
6. Arrangement according to claim 1, characterised in that, at its end opposite from the axis of pivot, the lever (28) is provided with a cranked part and, therein, with at least one opening (282, 283) for the cables (17, 18).
7. Arrangement according to claim 1 or 4, characterised in that the pulleys (22, 23) have, in their circumferential faces, grooves (221, 231) to guide the cables (17, 18).

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