EP3128116A1 - Ladder base for ladders, scaffolds, working platforms and the like - Google Patents

Abstract

Ladder foot for ladders, scaffolding, working platforms and the like, consisting of a fixing fitting (4, 5) fastened to each rail (2, 3) of the ladder (1) or of the scaffold or working platform, the fixing fittings (4, 5) are passed through the ladder foot (6) and guided displaceably and lockable on the ladder foot (6), wherein the mounting fitting on one spar (3) as on the Leiterfuß (6) freely displaceable guide fitting (5) is formed and the other Holm (2) of the conductor arranged fastening fitting (4) positively connected to the Leiterfuß (6) is connectable.

Description

The invention relates to a ladder foot for ladders, scaffolding, working platforms and the like according to the preamble of claim 1.

The invention in this case goes back to that of the same applicant DE 90 02 445 U1 out.

A ladder foot described therein is characterized in that a tilt adjustment of the ladder foot on the respective fitting on the spar of the ladder is possible to adapt the thus created ladder to different inclinations of the erection level.

The invention is not limited to a standing or laying ladder, but also refers to scaffolding trestles and work platforms and the like.

The object of DE 90 02 445 U1 is characterized by the fact that the fastening fitting for the adjustable attachment of the ladder foot was fastened in each case at the ends to the two bars of a ladder.

Thus, the document deviated from a prior art, which provides that the mounting bracket is attached to the rungs of the ladder.

A rung-side attachment of a Leiterbeschlages is for example by the US 1 424 934 A , the US 3,199,629 A or the EP 1 231 356 B1 described.

However, the rung-side attachment of such mounting hardware has the disadvantage that thus also a rung with in the clamping engagement composite between the conductor part and the thus adjustable connected ladder foot, which is associated with a higher production cost and a deteriorated ability to climb.

For reasons of construction and strength, it has proven to be cheaper to use each of the ends of the ends of the spars of the ladder for the arrangement of a mounting bracket, as by its own DE 90 02 445 U1 or the DE 34 07 143 C2 has been described.

The own DE 90 02 445 U1 shows a mounting bracket, which is designed as a clamping fitting. Thus, there is the disadvantage that the end arranged on the spars mounting hardware must be operated with the local clamping screws each by hand, and in the case of using a siding, the adjustment would only be possible that the mooring ladder is either supported somewhere on a surface or with held one hand, while with the other hand first of a clamping fitting and then following the other clamping fitting is actuated. This results in a high operating effort and a certain amount of uncertainty, in the way, because it can not be determined exactly whether the clamp fittings are sufficiently attracted or not. An exact alignment of the ladder on different mounting levels is therefore not possible because the view is directed at the setting of the mounting hardware down, and therefore alignment of the ladder upwards is not readily possible.

The DE 34 07 143 C2 describes positive connections between the ends arranged on the spars mounting hardware and the associated Leiterfuß.

In the front side of the lower ends of the spars approximately rectangular, aligned recesses are provided, which are preferably mounted centrally in the broad sides of the upright square hollow profile sections of the spars. The ladder foot is out of the two standing upright Hollow profile sections assembled. These hollow profile sections are connected to each other in the middle so that they form a symmetrical, roof-shaped structure.

In a recording of a locking member, a locking pin is attached, which can be introduced into trained as bores locking receptacles in the narrow upper side of the hollow profile section of the ladder foot. These holes are evenly spaced so that the ladder foot can be adjusted in stages.

When the closure part is open on the spar, the lock can be released by pivoting the hollow profile section, the ladder support can be moved and the lock can be restored to a new position of the support-side transverse slots by inserting the hollow profile section into the receptacle.

Disadvantage of this Arretierbeschlages or mounting bracket is the high Einstellaufwand and the fact that the adjustment can only be done with your hands, without the orientation of the ladder can be controlled during the adjustment process.

The invention is therefore the object of a ladder foot for ladders, scaffolding, working platforms with the same of the type mentioned in such a way that a simpler setting of the mounting bracket and a statement of this mounting bracket during the alignment of the ladder is possible.

To solve the problem, the invention is characterized by the technical teaching of claim 1.

An essential feature of the invention is that on the one spar of the ladder a guide fitting and on the opposite spar of the ladder a Fastening fitting is arranged, and the fastening fitting is connected to a foot-operated clamping lever, which clamping lever provides a positive engagement of the mounting bracket on the underside of the ladder foot.

With the given technical teaching, there is the advantage that only one side of the spar of a ladder a Fußbetätigbarer mounting bracket is arranged, while the other spar of the ladder is equipped only with a guide fitting, which is not operable.

With the operation of the mounting bracket by the foot of a user, there is now the first possibility that you can now perform an alignment of the ladder during the alignment of the ladder on the possibly resting on a sloping mounting level ladder foot, without requiring a visual inspection of the fußbetätigbaren mounting bracket is.

For actuation, the clamping lever is simply folded on the fastening fitting with a foot or another suitable body part, wherein it preferably points with its longitudinal axis in its clamping position perpendicular to the plane of the erection plane.

This means that in the clamping position or the locked position, the pawl associated with the fastening fitting engages in an associated toothing on the underside of the ladder foot.

If, however, the clamping lever is pivoted by 90 degrees and lies with its plane then approximately parallel to the mounting plane, so that the release position is given.

Essential in the invention is therefore that on the underside of the Leiterfußes a suitable toothing is arranged, which cooperates with an associated latch in the mounting bracket, which Pawl can be brought by actuation of the clamping lever in an engaged position in the toothing on the underside of the ladder foot.

Instead of attaching a toothing on the underside of the ladder foot, there is also the possibility of forming the pawl as a locking pin, which engages in associated, arranged on the underside of the ladder foot holes. Accordingly, the invention also provides for the kinematic reversal of the positive connection described above.

Although such holes are from the DE 34 07 143 C2 can already be seen, but have the disadvantage that they are located at the top of the Leiterfußes and therefore exposed to contamination.

After such ladders are used for craft purposes, there is a risk that after the DE 34 07 143 C2 known holes in the Leiterfuß be clogged by falling paint, plasters and the like, causing the functionality of the entire ladder foot is questioned.

This is where the invention, which provides a toothing on the underside of the ladder foot, said toothing may be formed either as a down and outboard rack or as a mutually engaging row of Absteckbohrung.

The finer the rack is formed in their teeth, the more sensitive is the setting of the ladder on the movable and detectable mounted ladder.

In a preferred embodiment of the invention, it is provided that the clamping lever of the mounting bracket is to be operated equally in both directions. That is, it can be pivoted upward in a clockwise direction to move from its locked position to a release position, wherein this pivoting can be done either clockwise or clockwise.

In a preferred embodiment, it is provided that the pawl performs a stroke of about 6 mm, whereby a reliable and positive engagement of the pawl is ensured in the toothing on the underside of the ladder foot.

In a separate from the first embodiment, the embodiment is claimed as a separate subject of the invention that the fastening fitting according to the invention is also designed as a clamping fitting. In this case, no positive connection between a pawl in the mounting bracket and an associated rack or teeth on the underside of the ladder foot is made, but only a clamp connection.

In this modified embodiment, it is then provided that the top of the pawl is covered with, for example, an elastomeric lining, which applies clamping to the underside of the ladder foot, so as to produce a clamping connection instead of a positive connection. However, the manner of operation of the clamping lever is also used in this clamping fitting, so that the basic function of the invention is also applicable to a clamping fitting and not only on a positive fastening fitting.

As drive means for the translatory movement of the pawl in the direction of the toothing on the underside of the ladder foot an eccentric drive is preferably used. In this embodiment, the pivot axis of the clamping lever is rotatably connected to the eccentric part of a clamping eccentric, which is displaceable in an associated recess of the pawl.

Upon pivoting of the tensioning lever by preferably 90 degrees, the eccentric is thus pivoted from its raised position to its lowered position, so that the upper side of the pawl with a toothed edge arranged there is disengaged from the toothing on the underside of the ladder foot.

In the illustrated embodiment, the eccentric is formed profiled round. However, it can also be square or oval.

In order to enable a defined locking position of the clamping lever, it is further provided that the clamping lever is spring-loaded in different pivot positions locked.

There are preferably three different pivot locks, because there are three different pivot directions of the clamping lever.

In a preferred embodiment, it is provided that the clamping eccentric is rotatably mounted self-locking in the recess of the pawl, which means that in the clamped position, when the tooth edge of the pawl is in meshing engagement with the teeth on the underside of the ladder foot, disengagement or accidental operation of the clamping lever is no longer possible. This is done by overcoming a required actuation force. At the same time, the pivot lock must also be overcome, which preferably consists of an actuating pin, which is arranged spring-loaded in a flange of the clamping lever, and in an associated, opposite locking hole on the outside of the mounting bracket can be brought into engagement.

The present invention is not limited to a curved ladder foot. It is also possible to use bent ladder feet, as known in the art.

As a further drive principle for the displacement drive of the pawl, the invention also provides the arrangement of a slidable clamping wedge.

Such a displaceable clamping wedge, which is to be preferably designed to be self-locking in relation to the actuated from below pawl, ensures at a corresponding translational displacement for a vertical sliding movement of the pawl, which thus also in positive engagement with the teeth on the underside of the ladder foot can be brought , Of course, instead of a meshing engagement, as previously described, a clamping engagement may be provided.

The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.

As far as individual items are referred to as "essential to the invention" or "important", this does not mean that these items necessarily have to form the subject of an independent claim. This is determined solely by the current version of the independent claim.

In the following, the invention will be explained in more detail with reference to a drawing which merely represents one embodiment. Here are from the drawings and their description further features essential to the invention and advantages of the invention.

• Figur 1: schematisiert eine Befestigung eines Leiterfußes an einer Stehleiter
• Figur 2: eine vergrößerte Ansicht der Ausführung nach Figur 1
• Figur 3: eine weitere Vergrößerung der Ansicht nach Figur 2 mit Darstellung weiterer Einzelheiten
• Figur 4: die Seitenansicht des Befestigungsbeschlages
• Figur 5: der Schnitt durch den Befestigungsbeschlag gemäß der Linie V-V in Figur 4
• Figur 6: eine gegenüber Figur 5 abgewandelte Ausführungsform

Show it:

• FIG. 1 : Schematically a fastening of a ladder foot on a stepladder
• FIG. 2 : an enlarged view of the execution FIG. 1
• FIG. 3 : another view enlargement FIG. 2 with further details
• FIG. 4 : the side view of the mounting bracket
• FIG. 5 : the section through the mounting hardware according to the line VV in FIG. 4
• FIG. 6 : one opposite FIG. 5 modified embodiment

The FIG. 1 shows as an exemplary embodiment of a conductor 1, the training as a stepladder, in which a first conductor part is formed by two spaced apart spars 2, 3, which are interconnected by rungs 7.

A second conductor part 10 is connected to the first conductor part.

Instead of a stepladder according to FIG. 1 Of course, all types of ladder and scaffolding can be used in which an adjustment to a mounting plane 33 (see FIG. 2 ) necessary is.

This is done according to FIG. 1 by a ladder leg 6, which is connected by means of two spaced-apart fittings 4, 5 with the bars 2, 3 at the end sides thereof.

The guide fitting 5 is only the sliding guide of a spar 3 on the Leiterfuß 6, while the other beam 2 with the Fastening fitting 4 according to the invention is connected, which has a clamping lever 8 as the actuating means.

By loosening the clamping lever 8 thus the right part of the conductor 1 can be moved in the direction of arrows 11 or 12 on the Leiterfuß and then fixed.

The tensioning lever 8 points in FIG. 1 the cocked position, in which a later to be explained pawl is in meshing engagement with a arranged on the underside of the Leiterfußes 6 teeth 9.

If, however, the clamping lever 8 is pivoted clockwise or counterclockwise, comes later to be described pawl 18 out of engagement with the teeth 9, and the head can be moved freely in the direction of arrows 11, 12 on the Leiterfuß 6.

The operation of the preferably takes place with a foot, therefore, the clamping lever 8 particularly large-area actuating surfaces 17 (see FIG. 3 ) on.

In known manner 6 foot pieces 13 are each arranged at the ends of the ladder foot, which may be formed in any desired manner. They may be made of plastic or metal, and may have any shape, because they only serve to allow a secure state of the Leiterfußes 6 on the mounting plane 33.

In the illustrated embodiment according to the FIGS. 1 and 2 the Leiterfuß 6 consists of a bow profile 14. The invention is not limited thereto. Instead of an oval arc profile, an approximately circular design of the Leiterfußes 6 also oval, kinked, rectangular or be formed in any other arbitrary manner.

Out FIG. 2 Further details can be found. First, it can be seen that the clamping lever 8 is aligned with its pivot axis 15 parallel to the longitudinal axis by the rung 7. This facilitates operability, because when you stand in front of the Leiterfuß 6, simply with one foot, the clamping lever 8 about its pivot axis 15 either clockwise or counterclockwise from his in FIG. 2 shown blocking position are brought into a pivoted by 90 degrees release position.

The actuation of the clamping lever 8 is therefore possible in both directions about the pivot axis 15.

In the illustrated embodiment according to FIG. 1 engages the Leiterfuß 6 through each on the sides of the spars 2, 3 arranged recesses 36 therethrough.

The recesses 36 are available as standard, because a provided for installation on flat surfaces Leitertraverse anyway is always included in the two recesses 36, and in the present invention, this straight ladder is replaced by the arcuate Leiterfuß 6.

Instead of the attachment of recesses 36 directly in the bars 2, 3, it is also possible to extend the end side of the respective spar 2, 3 by a suitable adapter by the recess 36 is arranged, and through which then the Leiterfuß 6 extends therethrough ,

The FIG. 3 shows further details of the invention. The mounting bracket 4 consists of a plug housing, according to FIG. 4 an upper socket 35 has, which is attached to the underside of the downwardly open spar 2. The fitting housing 16 has on both sides mutually opposite chamfers 20, and the pivotable clamping lever 8 has a recess 19 so that it is pivoted in both pivot positions in the arrow directions 22, 23 each in a release position which can be rotated by 90 degrees from the in FIG. 3 shown locking position is different.

In order to ensure a perfect pivoting of the clamping lever 8, the lower ends of the fitting housing 16 are provided with bevels 20.

The figure shows indicated that locking holes 21 are provided to lock the respective pivot position of the clamping lever 8. The FIG. 4 shows that there are a total of three locking holes 21 a, 21 b and 21 c. The two lying on the same level locking holes 21 a and 21 b are used for locking each of the clamping lever 8 in the release position, when compared to FIG. 4 pivoted 90 degrees to the left or 90 degrees to the right, and the locking hole 21c is used to lock the clamping position, as in the Figures 3 and 4 shown.

The clamping lever 8 has opposing flange plates 24, and on the underside of the flange plates 24 large-area actuating surfaces 17 are arranged arcuately, so that it can be easily operated with the foot.

The flange plates 24 are brought together in the upper region and are non-rotatably connected to a pivot shaft 37 which defines the pivot axis 15 of the clamping lever 8.

There is a central, central, extending in the longitudinal direction of the housing recess 25 is provided, on the underside of the upper side of the pawl 18 engages, which has on its upper side a tooth edge 28 in an associated tooth recess 9a on the toothing 9 at the bottom of the Ladder foot 6 is engageable.

The drive takes place according to FIG. 5 by a clamping eccentric 27, which is rotatably mounted in a recess 26 in the fitting housing 16.

The pivot shaft 37 is rotatably connected to the eccentric portion of the clamping eccentric 27, which is in the drawn position 5 in the raised position, and the tooth edge 28 has lifted in the direction of arrow 29 upwards. In order for a toothing engagement with the tooth recess 9a of the toothing 9 is given to the Leiterfuß 6.

If, however, the pivot shaft 37 pivoted by pressing the clamping lever 8 by 90 degrees in the direction of arrows 22, 23, the clamping eccentric 27 rotates in the recess 26 in its lowered position, and thus takes the pawl 18 down in the direction of arrow 29 with.

The pawl 18 is otherwise provided with an extension 18a, in which the recess 26 is arranged for receiving the clamping eccentric 27.

On the upper roof surface of the recess 26 in the extension 18a, a small recess 34 is provided, in which the outer periphery of the clamping eccentric 27 engages. By engaging in this recess 34 a self-locking is achieved, that is, without actuation of the clamping lever 8, the pawl 18 remains self-locking in meshing engagement with the opposite teeth. 9

The FIG. 6 shows in comparison to FIG. 5 an equivalent drive principle for the displacement drive of the pawl 18 in comparison to the clamping eccentric 27 after FIG. 5 , The FIG. 6 shows a clamping wedge 30, in the horizontal displacement of a clamping surface 31 is engageable with the associated recess 26 on the pawl 18 so that it can be raised or lowered in the direction of arrow 29.

The embodiment according to FIG. 6 is purely functional and does not show a constructive solution. It should be shown that instead of the drive with a rotatable clamping eccentric 27 as a mechanical equivalent, a displaceable clamping wedge 30 is possible, wherein the wedge tip 32 is shown shortened for illustrative reasons.

Overall, in the realization of the invention, the advantage that a foot-operated mounting bracket is given, which ensures a positive connection between a spar 2 of the conductor 1 and the associated Leiterfuß 6.

In another embodiment of the invention, instead of a positive connection between the Leiterfuß 6 and the mounting bracket 4, a clamping connection is shown. In this case, eliminates the teeth 9, and at the top of the pawl 18, an elastomeric clamping pad is mounted instead of the tooth-shaped extension 18a. In this embodiment, a non-positive connection between the guide fitting 5 and the Leiterfuß 6 is given instead of a positive connection, and also this compound f is ußbetätigbar.

drawing Legend

1

ladder

2

Holm

3

Holm

4

mounting bracket

5

guide fitting

6

ladder foot

7

rung

8th

clamping lever

9

Gearing 9a tooth recess

10

ladder section

11

arrow

12

arrow

13

footjoint

14

arc profile

15

swivel axis

16

fitting housing

17

actuating surface

18

Pawl 18a extension

19

recess

20

bevel

21

Locking hole a, b, c

22

arrow

23

arrow

24

flange

25

recess

26

recess

27

clamping eccentric

28

tooth edge

29

arrow

30

clamping wedge

31

clamping surface

32

Keilspitze

33

Installation level

34

recess

35

plug-in base

36

Recess (in 2)

37

pivot shaft

Claims (10)

Ladder foot for ladders, scaffolding, working platforms and the like consisting of a fastening fitting (4, 5) fastened to a spar (2, 3) of the ladder (1) or of the scaffold or working platform, the fastening fittings (4, 5) are penetrated by the ladder foot (6) and guided displaceably and fixable on the ladder foot (6), characterized in that the fastening fitting on the one spar (3) as on the Leiterfuß (6) freely displaceable guide fitting (5) is formed and the fastening fitting (4) arranged on the other bar (2) of the ladder can be positively connected to the ladder foot (6). Ladder foot (6) according to claim 1, characterized in that the fastening fitting (4) with a foot-operated clamping lever (8) is connected. Ladder foot (6) according to claim 2, characterized in that the clamping lever (8) provides a positive engagement of the fastening fitting (4) on the underside of the ladder foot (6). Ladder foot (6) according to one of claims 1 to 3, characterized in that in the tensioned or locked position, the fastening fitting (4) associated pawl (18, 18a) in an associated toothing (9, 9a) on the underside of a Ladder foot (6) engages. Ladder foot (6) according to one of claims 1 to 4, characterized in that the leiterfußseitige toothing (9, 9a) with an associated pawl (18, 18a) in the mounting bracket (4) cooperates, and that the pawl (18, 18a) Actuation of the clamping lever (8) in the engaged position in the toothing (9, 9a) on the underside of the ladder foot (6) can be brought. Ladder foot (6) according to one of claims 1 to 4, characterized in that the pawl is designed as a locking pin which engages in associated, arranged on the underside of the ladder foot (6) holes. Ladder foot (6) according to one of claims 1 to 6, characterized in that the clamping lever (8) of the fastening fitting (4) is pivotable in both directions by 90 degrees from its locked position into a release position. Ladder foot (6) according to any one of claims 1 to 7, characterized in that the pivot axis (15) of the clamping lever (8) rotatably connected to the eccentric part of a clamping eccentric (27) in an associated recess (26) of the pawl ( 18, 18a) is displaceable Ladder foot (6) according to one of claims 1 to 8, characterized in that the clamping eccentric (27) is self-locking in the recess (26) of the pawl (18, 18a) rotatably mounted Ladder foot for ladders, scaffolding, working platforms and the like consisting of a fastening fitting (4, 5) fastened to each beam (2, 3) of the ladder (1) or of the scaffold or working platform, the fastening fittings (4, 5) are penetrated by the ladder foot (6) and guided displaceably and lockable on the ladder foot (6), characterized in that the fastening fitting on the one spar (3) as on the ladder foot (6) freely displaceable guide fitting (5) and the another spar (2) of the ladder arranged fastening fitting (4) formed as a clamping fitting and with the Leiterfuß (6) is connectable.

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