JPS62260985A - Ladder for fire extinguishment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ladder device, in particular a firefighting ladder, with an extendable ladder section as defined in the general concept of claim 1.

PRIOR ART In the known firefighting ladder with an extensible ladder section, i.e. the ladder device, the ladder stringers of which have a bottom chord and a top chord, the chords being rigidly connected to each other by braces. The lower and upper chords are contoured to provide high torsional and bending strength. To do this, longitudinal members with complex profiles are used, which have multiple grooves and multiple curved edges. Such longitudinal members can also be reinforced by additional profiles, such as braces and square tubes, as described, for example, in German Patent 28 44 439. The various ladder members are expensive to manufacture, are susceptible to corrosion in their curved edges and groove areas, and limit their accessibility when using welding equipment, painting equipment, etc. It should be noted that sealing devices can present great difficulties, especially when the longitudinal members have winding grooves and open wing tips in cross section.
German Patent Application 33 26 644). It must be taken into consideration that plastic deformation will occur between the braces when the stress in the sliding path and running path of the longitudinal members is large. The reason for this is that open or protruding wing tips of the stringers are relatively unstable. It should be noted that the head rollers may create bending stresses in the downward run of the stringers between each ladder section. The slider for the lateral guidance of the ladder section described in DE 33 26 644 has a relatively large sliding surface, so that during operation the sliding surface section #1 becomes contaminated and the ladder device The appearance of the product may be damaged.

The object of the invention is to improve the known ladder device described in German Patent Application No. 33 26 644, and in particular to provide a ladder device of the type mentioned above, the lower chord of which has a functional and It is simple in form, and the vertical members of the ladder are l! The object of the present invention is to provide a ladder device that can withstand alternating loads and corrosive stress due to its unique structure.

(Means for solving the problems) The object of the present invention is achieved by the means described in the characterizing part of claim 1.

It is advantageous to refine the invention by the features set out in the subclaims 2 to 10.

An essential feature of the invention is therefore that the ladder stringer consists of a completely closed body in cross section, the rest delineating a stringer having at least three hollow cavities. The highly stressed edge parts, which are most exposed to the risk of fracture, are not absorbed by protruding wings as described in German Patent Application 3326 644, but by an external hollow body formed by the profile, i.e. for a better distribution of the edge stresses. It is absorbed by hollow body protrusions that can be absorbed. The external cavity provides the ladder with high bending strength against horizontal and vertical stresses. By means of its upper hollow body protrusion, the inner profile absorbs the forces transmitted upwardly from the inner ladder section through the invasive slider.

At this time, the *2 hollow body protrusion is supported by the bracing and outer profile. The inner profile serves as a sliding surface and a force receiver for the inner ladder section in roughly vertical and horizontal directions. The hollow protrusion has the important function of absorbing shear stress without causing buckling when horizontal stress occurs. Furthermore, the stepper can be welded smoothly. The lower chord and longitudinal members are essentially three parts: the inner profile with the hollow end projection, the outer profile with the outer protrusion or winding groove, and the running surface when drawing in and stretching the ladder section. It consists of a lower section that serves as a The wall thicknesses of the aforementioned three members can be pre-calculated to be optimal depending on the load, so that a reasonable light AM structure can be obtained at low cost. In areas where the ladder vertical members are subject to high stress, further reinforcement or the use of profiles in the vertical members can protect the running surface from plastic deformation and increase the moment of resistance within the vertical members. It can be done.

The front sliding member for the lateral guide is rigidly mounted to the inner profile in such a way that it can be freely adjusted and removed in the forward direction. This l! ! The movable member has a smaller support surface than the lateral guide for the inner ladder part and serves as a force receiver in the vertical direction when the ladder is erected or used as a bridge.

According to the invention, therefore, a light M ladder is obtained which has supporting members of equal bending strength. It is possible to reinforce areas of high stress inside the vertical members without damaging the appearance. When producing profiles, the same tool can also be used for different wall thicknesses of the individual parts. Furthermore, the steps of each vertical member of the ladder portion can be optimized.

Since the welds on the longitudinal members can be made thicker, corrosion is significantly reduced.

External welding is especially suitable for robot work.

The present invention will now be described in detail with reference to the accompanying drawings.

(Example) FIG.
Ladder sections 2 are shown. Each ladder section 2 is telescopically extendable.

Each ladder section 2 is substantially similarly formed in some respects and has left and right upper chords 5 and left and right lower chords 4, the associated lower and upper chords being interconnected by braces 6. ing. In this case, the horizontal step 7 is welded to the associated lower chord.

Each upper chord 5 of the ladder section 2 consists of an eccentric square tube 29' with downwardly extending wings 30, the outer side of which serves in fixing the braces 6. The upper and lower sides of the square tube 29 are used as a transfer path or a sliding path for an elevator (not shown).

Like the upper chords 5, each lower chord 4 of the ladder section has different dimensions but the same outline. Each bottom chord 4 or longitudinally extending ladder stringer has at least three mutually welded members, as shown in detail in FIGS. 2 to 4, as follows: The profile member 11 is located inside the knee, and has a horizontal leg 12 and a vertical leg 13, the free ends of which are formed as a first hollow body protrusion 8 facing upward and a second hollow body protrusion 9 facing inward. - the outer profile 14 and the horizontal leg 15
and this leg is welded to the inner profile 11 in the area of the second hollow body projection 9, such that the second hollow body projection 9 is located higher than the horizontal leg 15 of the outer profile 14. , further comprising a leg 16 with an outward winding groove 17; - a lower profile 18 with a vertical leg 19 which is flat, i.e. without a winding groove as described above; This leg is welded to the lower side of the root of the inner section 11.

Furthermore, the lower profile 18 has a horizontally downwardly directed, likewise flat leg 2.
0 and the free end of this leg is the vertical leg 16 of the outer profile 14.
Welded to the lower free end of the main body-cavity 10 in the longitudinal member
It is designed to form a

The front sliding member 25 of each ladder section 2 is shown on the left side of FIG. 1, and its detail is shown on an enlarged scale in FIG. This member is fixed to the second hollow body projection 9 of the inner profile 11, but is adjustably mounted to the profile and can be removed forwardly from the ladder section. Said sliding member forms a relatively small contact surface 28 for the associated winding groove 17 of the inner ladder section, which practically avoids contamination of the lateral stringers during operation and thus improves the optical appearance of each ladder section 2. It is supposed to be good.

Rearward llI of each ladder section 2? The moving member 26 is shown on the side of FIG. 1, and its details are shown on an enlarged scale in FIG. The first-mentioned front sliding member 25 is for lateral guidance of each ladder section, but the later-mentioned dip sliding member 26 is for vertical guidance, and its dimensions are is large, and unlike the front sliding member, is the winding of the outer profile 14 rather than the inner profile 11? 1i1
It is fixed and adjustable at 7. During operation, this sliding member 26 therefore slides against the adjacent inner profile 11 of the outer ladder section. The sliding member 26 can be removed rearward from the ladder section by loosening it.

Furthermore, as shown in FIG. 3, the first hollow body protrusion 8 of the inner profile 11 of the innermost ladder section 2 is formed as a receiving cavity for the inner cable 21, which cavity therefore serves to protect the cable from damage. have.

Each ladder section 2 runs over a top row 524, indicated by dashed lines in FIG. In this case, the lower side of the flat horizontal n20 of the lower profile 18 serves as a support surface or a running surface for the head roller 24.

In order to further strengthen the lower chord 4 and the ladder stringers, another 4° profile 22 with a flat leg inside said main cavity 10
can be acceptably welded, additionally forming a partial cavity and bridging said winding groove 17.

In this case, the vertical leg 23 of the further profile 22 is connected to the lower profile 18.
hit the horizontal leg 20 of the
IllI 20 can be additionally reinforced and its underside can serve as a running surface for the associated head roller 24. The arrangement of the further sections 22 in the longitudinal section and the assembly of the various components are shown in particular in FIG. In this figure, the modular assembly of the individual members to complete the ladder is shown in side view and perspective view. It is of particular importance that the weld bead 31 is formed in the upper region of the stringer, so that the ladder section retains the required bending during the contraction process of the welding, so that no adjustment work is necessary. Temporary welding 27 is performed in the longitudinal direction on the second hollow body protrusion 9 between the braces 6 to prevent the second hollow body protrusion 9 from deflecting when stress becomes large. .

[Brief explanation of drawings]

Figure 1 is a diagrammatic front view of the right rear left half part and the left 11η half part of a firefighting ladder having four ladder parts, and Figure 2 is a schematic front view of the ladder shown in Figure 1. FIG. 3 is a detailed view of the left half portion of the ladder; FIG. 3 is a detailed view of the right hand portion of the ladder shown in FIG. 1; and FIG. 4 is a perspective front view showing the constituent members of the ladder portion separated. 1... Ladder device, 2... Ladder part, 4... Lower chord material, 5... Upper chord material, 6... Bracing, 8.9.10...
・Hollow cavity, 11... Shape material, 12.13... Leg, 1
4... Shape material, 15° 16... Leg, 17... Winding groove, 18... Shape material, 19, 20... Leg, 21... Cable, 24... Head roller.

Claims (1)

[Scope of Claims] (1) A ladder device (1) having an extendable ladder portion (2)
), in particular for firefighting ladders, each ladder section (2) having a bottom chord (4) and a top chord (5), the chords having a bracing (6).
), in which there are at least three cavities (8, 9,
The lower chord (4) formed as a closure with 10) is formed into an inner profile (11) with three mutually welded parts, namely: - a horizontal leg (12) and a vertical leg (13); an inner profile whose free ends are formed as a first hollow body protrusion (8) pointing upward and a second hollow body protrusion (9) pointing inward; - an outer profile (14) having horizontal legs (15); ), the leg is welded to the inner profile (11) in the area of the second hollow body projection (9), and then the leg is welded to the inner profile (11) in the area of the second hollow body projection (9).
) is located higher than the horizontal leg (15) of the outer profile (14) and has a vertical leg (16) with a winding groove (17); - a flat vertical A lower profile (18) with legs (19), which are welded to the underside of the inner profile (11) in the region of its root, and further horizontally outwardly directed flat legs (20).
, the free end of said leg being welded to the lower free end of the vertical leg (16) of said outer profile (14) to form a body-cavity in the lower chord (4). A ladder device characterized in that it has a lower profile member. (2) In the ladder device according to claim 1,
Ladder device, in which the first and/or second hollow body projections (8, 9) of the inner profile (11) are formed as receiving chambers for the cable (21). (3) A ladder device according to claim 1 or 2, in which the lower chord (4) is reinforced by at least another welded inner profile (22) and its flat vertical leg (23) a ladder device which spans the winding groove (17) and adjoins the horizontal leg (20) of the lower profile (18) on its lower side. (4) In the ladder device according to any one of claims 1 to 3, the lower side of the horizontal leg (20) of the lower profile (18) is the support surface of the head roller (24). A ladder device formed as a ladder device, wherein said roller is rotatably arranged on a ladder section (2) below it. (5) In the ladder device according to any one of claims 1 to 4, the horizontal treadle (7) is positioned between the lower chord members (4) and the inner profile member (11). The first protrusion (
8) A ladder device welded to the underside of the horizontal leg (12). (6) In the ladder device according to any one of claims 1 to 5, the lower chord member (4) and the upper chord member (
A bracing (6) is provided between the vertical leg (13) and the vertical leg (13), which is welded on the underside to the vertical outer surface of the vertical leg (13) containing the second projection (9) of the inner profile (11). ladder device. (7) In the ladder device according to any one of claims 1 to 6, the inner profile member (11) is provided with a sliding surface in the horizontal and vertical directions relative to the inner ladder portion (2). A ladder device configured as a moving surface and a force receiving member. (8) A ladder device according to any one of claims 1 to 7, in which the front section of the ladder part (2) is rigidly mounted on the inner profile (11). a small lateral support surface (28) for laterally guiding said inner ladder part (2) with a forwardly removable sliding member (25) of said ladder part (2); A ladder device provided with a sliding member having a large support surface for the action of forces. (9) A ladder device according to any one of claims 1 to 8, in which the adjustment is rigidly mounted in the winding groove (17) in the rear region of the ladder part (2). Ladder device, which is provided with a freely removable sliding member (26) for vertical and horizontal guidance in the outer ladder part (2). (10) In the ladder device according to any one of claims 1 to 9, the first and/or
The second hollow body projections (8, 9) have one or more temporary welding points (27) in the area between adjacent steps (7) and in the area between adjacent braces (6). ladder device.