EP1516101B1 - Extendable ladder that can be rolled out and locked - Google Patents

Abstract

The invention relates to running gear and a running gear head for an extendable ladder, in addition to an extendable ladder comprising stiles that are connected by rungs, a base end and an extendable end lying opposite said base end, the running gear being located in the vicinity of said extendable end. According to the invention, the running gear comprises at least one rotative bearing element, the latter (8) being provided with a brake device, which checks, brakes or locks the rotation, (arrow 10), of the bearing element (8).

Description

The invention relates to a Anstellleiter according to the preamble of claim 1.

Anstellleitern the above type are known in various designs from the prior art.

In US-A-5,833,028 discloses a Anstellleiter and a drive comprising the aforementioned features. The contact element is in this case inhibited by a brake plate as a braking device in its rotational mobility in one direction. When extending the ladder, the contact element is not inhibited by the brake plate. Only in the opposite direction of extension, the brake plate engages in the rotational mobility of the contact element and inhibits this. This prevents accidental slipping of the ladder from the wall.

In US-A-5,123,503 is a Anstellleiter and a drive disclosed. The contact element is designed in the form of an impeller. The braking effect arises here by the rubber-elastic behavior of the impeller with the formation of a contact surface or flattening when the Anstellleiter is burdened with the weight of a user.

To allow easy extension of a Anstellleiter example on a house facade, At the Anstellenden the ladder wheels are provided as abutment elements which rotate when extending the Anstellleiter about an axis. Without damage and with a very small rolling resistance, they roll along the façade, making it much easier to set up and assemble an especially long ladder.

In particular from the EP 0 832 343 B1 Embodiments are known which remedy the disadvantages of the ladders in particular with wheels and allow employment on straight facades or walls and on interior and exterior corners.

For this purpose, it is proposed to provide a drive that is either adaptive or integral part of a Anstellleiter. The drive optionally includes wheels or other designed sliding elements, which are arranged in different positions to allow a hiring of the ladder on straight surfaces, on outer and inner corners.

By using the drives proposed here, the Anstellsicherheit should be improved. Due to the weight of the user, the wheels of the drives are deformed and thus form a secure contact surface.

definitions

Below are terms used that have the following meanings:

An engagement

The term Anstellleiter are such ladders to understand having a foot end and Anstellende, the foot end can be set up, for example, a floor or a floor surface and the Anstellende can be applied to a facade.

facade

The term facades are to be understood in particular vertical Anstellflächen to which a ladder is adjustable. The term is not intended to be limiting, but also includes such vertical support surfaces, such as inside corners, outer corners, posts, columns.

drive

The term drive is to be understood as a preferably rotatably mounted contact element and its storage in a drive head.

Drive head

The term drive head is to be understood to mean a device which comprises at least one drive and which can be attached to an attachment end of a conductor in any desired manner.

Object of the invention

The object of the invention is to further develop the Anstellleiter known from the prior art in such a way that the Anstellsicherheit is increased both on straight surfaces, on outer and inner corners.

Solution of the task

The object is achieved by a Anstellleites according to the features of claim 1.

Advantages of the invention

One of the significant advantages of the invention is that the very functional Anstellleiter from the prior art with the drive head proposed herein has a very high stability. For hiring the ladder on an arbitrarily designed facade, the properties of a "roll ladder" are used, i. when setting up, the employee rolls along the façade without damaging it. Preferably, only when entering the Anstellleiter load-dependent, the contact element is braked, blocked or inhibited. In particular, by an adhesive design of the contact element, a security-increasing and thus accident-reducing effect is achieved.

The inventive design of the drive can be transferred to all types of Anstellleitern. Already for such Anstellleitern, which have only facing forward to the facade indicative investment elements, such a security-enhancing measure can be provided. But even with the example of the EP 0 832 343 B1 known designs of drives or ladder heads, the formation of a Hemmelements, braking or blocking element can be provided, which can be optionally distinguished between automatically achievable inhibition by climbing the ladder or by manually operated inhibition by the user before or while climbing the ladder.

Preferably, for safety-related reasons, such an embodiment is proposed in which the stopping action of the rotatable abutment element is automatically achieved when the first rung of the abutment guide, which is ajar against a facade, is automatically reached.

The invention provides that the contact element in addition to its one rotational degree of freedom (rolling along, for example, a facade) additionally has a translational degree of freedom. The displacement movement of the correspondingly mounted contact element preferably occurs when the user enters the first rung of the Anstellleiter. As a result of the force acting on the contact element, the latter shifts by a small distance away from the facade until it at least partially comes to rest on a braking surface. By the abutment of the abutment element on the braking surface is achieved that the rotational degree of freedom is blocked and thus the rotational movement is inhibited. Preferably, the abutment element is displaced against an intended defined spring force, so that upon release of the Anstellleiter the spring force pushes the contact element in its original position and the braking effect is thus automatically canceled.

Due to the "retraction" of the contact element is also achieved that different forces acting on the Anstellende while walking the Anstellleiter, can be optimally absorbed without slipping the Anstellleiter occurs.

In addition, the security is further increased, in which the contact elements are designed as rollers or rollers. Furthermore, these are made of a very adhesive high-quality material.

Preferably, the resilient mounting of the abutment elements by train-pressure springs, which are formed spirally achieved. Alternatively, leaf springs, but also hydraulic or gas springs can be provided. Another embodiment may be to support the abutment elements on elastic elements, for example, made of rubber or a similar effect of achieving plastic.

According to the invention, it is provided to accommodate the bearing element designed and mounted according to the invention in a drive head, whereby different embodiments can be provided.

On the one hand, the abutment element according to the invention can be arranged with at least one further abutment element according to the invention in a drive head, so that an employment of the ladder with the inventive drive head on an inner or outer corner of a facade can be adjusted. Preferably, three contact elements are each arranged on a spar of a Anstellleiter, each contact element is independent of the other system elements rotatable and displaceable.

Further advantageous embodiments will become apparent from the following description of exemplary embodiments, claims and drawings.

drawings

Fig. 1

eine schematische Darstellung einer Anwendung einer ausfahrbaren Anstellleiter in drei unterschiedlichen Stellungen (A, B, C) gemäss dem Stand der Technik;

Fig. 2

eine vergrösserte seitliche Darstellung des Laufwerkskopf der Anstellleiter gemäss Fig. 1;

Fig. 3

eine schematische Draufsicht auf ein erstes Ausführungsbeispiel eine erfindungsgemässen Laufwerkskopfs mit drei Laufwerken, ohne Abdeckelement;

Fig. 4

eine Seitenansicht auf den Laufwerkskopf gemäss Fig. 3;

Fig. 5

eine schematische Seitenansicht auf ein weiteres Ausführungsbeispiel eines erfindungsgemässen Laufwerkskopfs;

Fig. 6

eine Draufsicht auf ein drittes Ausführungsbeispiel eines erfindungsgemässen Laufwerkskopfs.

Show it:

Fig. 1

a schematic representation of an application of an extendable Anstellleiter in three different positions (A, B, C) according to the prior art;

Fig. 2

an enlarged side view of the drive head of Anstellleiter according to FIG. 1;

Fig. 3

a schematic plan view of a first embodiment of an inventive drive head with three drives, without cover;

Fig. 4

a side view of the drive head according to FIG. 3;

Fig. 5

a schematic side view of a further embodiment of an inventive drive head;

Fig. 6

a plan view of a third embodiment of an inventive drive head.

Description of the embodiments

In Fig. 1, a Anstellleiter 1 is shown, which is shown in Fig. 1A in a solid, in Fig. 1B in a middle and in Fig. 1C in a transport position. The Anstellleiter 1 has almost parallel to each other spars 2 and the spars 2 connecting rungs 3. The foot end 4 is placed on a flat surface 5, wherein the foot end 4 opposite end, the Anstellende 6, is based on a non-illustrated in Fig. 1 facade.

In Fig. 2 is an enlarged view of the Anstellendes 6, based on a facade 7, the Anstellleiter shown in Fig. 1 1 shown. According to the prior art, such Anstellleitern 1 a mounted on a spar 2 of the Anstellleiter 1 contact element 8. This contact element 8 shown here is an impeller, which is rotatably, ie rotatably, mounted about an axis 9 in the direction of the double arrow 10. During the extraction in the direction of the arrow 11 or the retraction in the direction of the arrow 12, the impeller rolls on the facade 7 from.

In order to enable locking, blocking, inhibiting or braking of such a rotatable abutment element 8, a drive head 13 (FIGS. 3, 4) is proposed which comprises specially mounted abutment elements 8 with defined functions. The drive head 13 in the exemplary embodiment according to the invention shown here comprises the contact elements 8, which are arranged in a plane at an angle of approximately 45 ° to one another. The plant elements 8 are rotatable on an axis 9, i. rotatotically, and stored independently. The free ends of the axle 9 are received by two connecting elements 14. The connecting elements 14 are displaceable, i. translationally mounted in the direction of the arrow 15 and its opposite direction against a spring force within the drive head 13. The spring force is generated by provided in this embodiment, coil springs 16, which is designed such that the contact elements 8 to move in the direction of arrow 15, working against the spring force.

The drive head 13 can be mounted on the Anstellende 6 Anstellleiter 1. For this purpose, a fastening element 17 is at provided in this embodiment, which is in the free end of the spar 2 of a Anstellleiter 1 can be inserted and screwed there accordingly. In addition, the distance 18 (Fig. 3) between two drive heads 13 and the distance 19 (Fig. 4) between the contact element 8 and the Anstellleiter 1 vary.

By ascending the Anstellleiter 1 (Fig. 1-4), a force is exerted on the Anstellende 6, which acts on the respective located with the facade 7 engaging element 8. This also causes the respective contact element 8 is moved in translation in the direction of the arrow 15 and that until it reaches a braking surface 22 to the plant. Since the contact element 8 preferably consists of very soft adhesive material, it is achieved by the abutment of the abutment element 8 on the braking surface 22 that the rotational movement of the abutment element 8 is automatically inhibited.

Claims (5)

1. A engagement ladder (1) with rails (2) connected by rungs (3), with a foot end (4) as well as with an engagement end (6) which lies opposite to the foot end and in whose region a runner means is arranged, wherein the runner means comprises at least one bearing element (8) which is rotatably mounted on a pivot (9) in both rotation directions (10), and the runner means (8) comprises a brake device which locks the bearing element (9) in its rotational movement,
   characterised in that the pivot (9) of the bearing element (8) is mounted in a translatorily displaceable manner under the effect of force, in a manner such that the bearing element (8) with a displacement of the pivot (9), is brought from a first position with a free rotational mobility in both rotation directions (10), into a further position with which the rotation mobility of the bearing element (8) is locked in both rotation directions (10) by the action of the braking device, and the bearing element (8) is arranged in a manner such that independently of its position, at least one part of the bearing element (8) may be brought into contact with the wall.
2. An engagement ladder according to claim 1, characterised in that the bearing element (8) is mounted in a spring-like manner with a predefined spring force in the direction of the translatory movement.
3. An engagement ladder according to claim 2, characterised in that spring force may be adjusted.
4. An engagement ladder according to one of the preceding claims, characterised in that the runner means (8) envisages a runner head (13) with three bearing elements (8) which are arranged to one another in a plane at an angle of approx. 45°, and the runner head (13) may be coupled to an assembly element (31), and the asembly element is designed in a manner such that this may be inserted into the free end of the rail (2) at the engagement end (6), and the assembly element (31) is further designed in a manner such that this may be inserted into receiver elements (25) which may be selectively attached on the inner side or the outer side of the respective rails (2) of the engagement ladder (1).
5. An engagement ladder according to claim 4, characterised in that the assembly element (31) additionally comprises a tensioning element, which tensioning element is attachable between two rungs (3).

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