JPH04505354A - add-on ladder - Google Patents

Abstract

An extension ladder comprising at least two separate single ladders (10, 20, 30, 40) which in their starting position lie upon one another and are slidable in relation to one another is shown. One of the two adjacent ladders comprises guide means for the other. Between each adjacent single ladder there is arranged a line pull system comprising line guides (1, 1'; 2, 2'; 3, 3'; 4) over which the line (7) runs and changes direction. Such a line pull system is independently arranged between two adjacent single ladders, so that a four-part extension ladder has three independent line pull systems.

Description

[Detailed description of the invention] add-on ladder The present invention is initially superimposed on the other ladder and is attached to the other ladder. including at least two separate single ladders slidable against each other and adjacent to each other; Concerning extension ladders where one of the two adjoining ladders contains a guiding device for the other; Ru.

The term "additional ladder" refers to a ladder consisting of at least two single ladders, which can be slid. means a ladder where an auxiliary device such as a robe is used to lift the ladder Ru.

In addition, the extension ladder allows the ladder to remain in the extended position both during the lifting operation and in the extended position. A locking hook or lowering hook must be provided for locking. Tsutsuji The ladder can reach a length of up to 25 meters when fully extended.

Especially when it comes to rescue ladders, the ever-increasing demands on safety and functional efficiency Continued development has been carried out to ensure conformity. Therefore, it is necessary to use great force quickly and easily without any significant inconvenience to the robe. There is a need for a rescue ladder that can be operated into an extended position. Furthermore, the robe is on the ground. A joint that allows the free end of the lobe to be handled to prevent it from gathering in a tangled manner on the top. There was a request for a ladder.

In the extension ladders described herein, when a single ladder is lifted, the The ladder itself collects the robes continuously so that they do not collect on the ground. This provides a faster extension action against the wall, which is an important factor when performing a rescue. It is something that can be achieved. In order to make the extension ladder as self-contained as possible, Add support legs that give your child 4-point contact with the ground so that the ladder is completely their own. Advantageously, it is possible to stand upright in an extended position. For rescue purposes, e.g. Rapid engagement of the type described in Norwegian Application No. 891,965 filed at It is advantageous to develop a supporting leg.

The purpose of the above is to ensure that between each pair of adjacent single ladders, the lobes run over it. A lobe tensioning device including a lobe guide is arranged to allow the lobe to be deflected and redirected. and the first ladder has one on each side at one end of the first ladder. or two first lobe guides on the same side and one side at the opposite end. A pair of third lobe guides are provided, and a second ladder is provided with a respective third lobe guide. one on each side or two second lobe guides on the same side; Furthermore, on one side and at the same time at the same end as said third lobe guide, there is a fourth lobe guide. a lobe guide, the lobe at a first end thereof being connected to the second lobe; said first lobe guide fixed to said second ladder within the same end area as said lobe guide; the second lobe guide of the opposite secondary the third lobe guide up to the secondary first lobe guide on the opposite side. up to the fourth lobe guide, to the third lobe guide of the opposite secondary and further to a lowering hook device attached to said second ladder. and the lowering hook device engages the first ladder portion. The joint of the type mentioned at the beginning, which is characterized by being locked to this This is accomplished by adding ladders.

The lobes pass through the ladder rungs from the second lobe guide to the opposite secondary lobe guide. It is advantageous to be able to pass until the end. In this way the ladder staircase passage intersects the robe The lobe guide is made completely free from the funnel and longitudinal lobes. such as shaped holders, movable pulleys, casters or a combination of these It can be made in any suitable format.

A single ladder that is first lifted has a top ring that is held against a wall or similar base part. It is advantageous to be able to provide

As mentioned above, the ladder also has support legs that provide four-point contact with the ground or floor. The ladder is self-supporting and remains free to stand upright when the entire ladder is fully extended. It can be done so that it can be done.

Lobe guides, pulleys or casters are attached to each side tH1 member. can be placed within each fitting.

Ladders can be made from any suitable material, but practical and lightweight ones It is currently constructed of aluminum. There are more than two additional ladders. If it consists of a single ladder, each lobe may be marked, for example by coloring. the ladders are attached so that the individual single ladders can be lifted in the proper order. It is.

Other additional objects, features and advantages are for illustrative purposes only and are non-limiting. The following description of the presently preferred embodiments of the invention is illustrated in conjunction with the accompanying drawings. Therefore, it becomes clear.

FIG. 1 is a front view of a ladder according to the invention in a partially raised state; the law of nature, 2 is an end view of the ladder according to FIG. 1, and FIG. 3 is a side view of the ladder according to FIG. It is a side view seen from the surface, FIG. 4 is an explanatory diagram showing the principle of lobe tension and lobe guidance.

Referring to Figure 1, a joined ladder consisting of four single ladders 10.20.30.40 is It is shown. This extension ladder is a single ladder with fewer or more numbers. This example is shown as having four ladders, although it could also consist of four ladders. , due to its compact form in the retracted position and reaching length in the raised position. It is particularly advantageous in this regard. As is clear from the drawing, the bottom ladder 10 is the widest The top ladder 40 is the narrowest. Each single ladder has its own side members, That is, stringer 5, 5', 15.15', 25.25°: 35.35' and horizontal bars 6.16.26.36.

The top ladder 40 has a top that is held against a wall or the like during the lifting operation. A ring 9 is provided. As already mentioned, this ladder is in excellent condition and has the required rigidity. Advantageously manufactured from aluminium, which combines strength, strength and light weight. Ru.

As is clear from Figure 2, the single ladders 10, 20, 30, 40 are connected to each other. and are arranged so that they are each reduced by approximately the width of two rails. , the width of each single ladder is between approximately 80mm and 120mm in total. It is. One stringer member is provided with a guide device (not shown), which The guiding device guides each of two adjacent single ladders and supports the other single ladder. It makes it possible to

Figure 3 shows a single ladder 10.20.30.40 seen from the side and shows how this It shows whether a single ladder such as is inside other ladders and guides other ladders. Transfer A locking device, i.e. a lowering hook (not shown), is provided on the side rail to be moved. However, this lowering hook is detailed in Norwegian Patent No. 151,755. It is described in. This lowering hook can engage the adjacent ladder rung. so that each step of the ladder can be locked against another ladder. It has become.

FIG. 1 also shows a lobe pulling device for lifting each ladder.

This lobe tensioning device is connected to the lobe 7 and the respective rope guides (1, 1゛゛　:2 ．． 2′:3.3′;4), and the lobe guide in the illustrated embodiment is in the form of a pulley or caster. Of course, these things having an outwardly bent or flared holder opening at each end Other shapes can be grown, such as an elbow tube. Adjacent of each pair There is one independent lobe tensioner between the single ladders and the four-part joint shown. In the ladder there are three independent lobe tensioning devices, namely a single ladder 10 and 20, one between the single ladders 20 and 30, and the single ladders 30 and 30. It is important to clearly remember that one is allowed between 40 and 40. It is essential. Therefore, in the following one lobe tensioning device between two single ladders Only that is explained. Normally, when lifting an extension ladder, start with the narrowest ladder. This is done by pulling up the top ladder 40. then a single ladder 30 is pulled up together with a single ladder 40.

Finally, a single ladder 20 is lifted; At the same time, each single ladder 30 and 40 is also lifted.

The lobe tensioning device is shown in more detail in principle in FIG. From this drawing A lobe tensioning device has the ability to change the direction of the lobe by approximately 90° or 180°. It is clear that it has. As is clear from FIGS. 1 and 4, lobe 7 has one end fixed to the lower end of the side member 15 and is led to the first pulley 1. It is rotated 180° downward to the second pulley 2, then rotated 90° and guided to the second pulley 2. It is guided through the wedge bar 16 of the ladder to the second pulley 2 of the secondary order on the opposite side, and then Turn 0' upwards to the secondary pulley 1', then turn downward again 180° in the opposite direction. It is then guided up to the third pulley 3, where it is rotated 180 degrees upwards and connected to the fourth pulley. -4, and then rotated 180 degrees downward in the opposite direction to the secondary third pulley 3'. and then rotated 180° in the opposite direction upwards to the side member 15 of the ladder 20. It is guided to an attached lowering hook (not shown). Therefore, this descending foot The hook follows upward together with the side member 15' and locks onto the horizontal bar 6 of the adjacent ladder 10. It is possible to be taught. When the ladder 20 is moved relative to the ladder 10, The attachment to the side member 15 is done by one of the lobes 7 located between the part and the first pulley l. The sections become progressively shorter. At the other end of the lobe 7 where the lowering hook is attached The part of the lobe 7 between the secondary third pulley 3° and the descending hook is It is expanded accordingly. first pulley 1 and second pulley 2 respectively and between the secondary pulley 2° and the secondary 1st boolean. The section of the lobes becomes even shorter and this lobes are again connected to the third lobes 3 and the fourth lobes. It is wound up between the pulley 4 and the secondary third pulley 3°. This way so that all the robes were conformed, and no part of the robe was gathered upon the earth. It is then held within the device.

This add-on ladder is also satisfactory even if all the lobe guides are placed on one side of the ladder. Functions on the feet. Therefore, this embodiment is also within the scope of the invention. But both sides The form of the embodiment in which the lobe guide is located at the top is the presently preferred embodiment. Why? Does this embodiment of the mule provide good force distribution on both sides of the ladder during the extension operation of the ladder? It is et al.

As mentioned above, this ladder is equipped with support legs that touch the ground at four points, making it easy to move freely. It is possible to form an additional ladder unit that can stand upright.

If the ladder consists of more than two single ladders, it can be colored, for example. Mark the ladders to indicate the order in which these single ladders are given, preferably the top ladder. Ladder 30 is lifted first, then ladder 20 is lifted last. is appeasement.

Each lobe guide in the illustrated embodiment is for example riveted or welded. are arranged in fittings attached to the respective side members.

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Claims (8)

[Claims] 1. Initially on another single ladder and able to slide relative to this other single ladder comprising at least two separate single ladders (10, 20, 30, 40) so that one of the two adjacent ladders includes a guiding device for the other ladder. In addition ladders that are 0, between 20 and 30, between 30 and 40) A tensioning device is provided, the rope tensioning device pulling the rope (7) over it. The rope guide includes a rope guide that allows the rope to be run and change direction; ladders (10) at their upper ends, one on each side or on the same side. two first rope guides (1, 1'), one pair on one side at their lower ends; A third rope guide (3, 3') is provided, and an adjacent ladder (20 ) at its lower end, one on each side or two second on the same side. A rope guide (2, 2') is provided, furthermore on one side said third rope. A fourth rope guide (4) is provided at the same end as the rope guides (3, 3'). such that said rope (7) is attached to said second ladder (20) at its first end (8). The front rope is fixed within the same end range as said second rope guide (2, 2'). The first rope guide (1) further leads to the second rope guide (2). , and the second rope guide (2') of the second order, and the first rope guide of the second order. (1'), the third rope guide (3), and the fourth rope guide (4). , the secondary third rope guide (3'), and the second ladder (20). and a lowering hook device attached to the lowering hook device, the lowering hook device being connected to the lowering hook device. It is designed to be engaged with and locked to the ladder (20) of No. 1. A ladder with an added feature. 2. The rope passes through the rear bar (16) of the ladder to the second rope guide (2). Claim 1, characterized in that the cable is guided from the secondary rope guide (2') to the secondary rope guide (2'). Added ladder as described in section. 3. The rope guide is equipped with a holder device, a pulley, casters or a combination thereof. Claim 1 or 2, characterized in that it is constructed by a combination. Added ladder. 4. Particularly, said ladder (40) which is lifted first includes a top ring (9). 3. An extension ladder according to claim 1, 2 or 3. 5. Contains support legs of the type that provide four-point contact with the base surface for self-supporting purposes. An extension ladder according to claims 1 to 4, characterized in that: 6. Said pulley or caster is connected to the respective side member, i.e. stringer. - that attached to (5, 5'; 15, 15'25, 25'; 35, 35') The joint leg according to claim 3, wherein the joint leg is arranged within each fitting part. Shi ladder. 7. Claims 1 to 6 are made of aluminum. The addition ladder described in the previous section. 8. Said rope (7) is marked with markings to indicate the order of lifting. An extension ladder according to claims 1 to 7, characterized in that: