JPH0826738B2 - Fire ladder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ladder device having an expandable ladder portion, and more particularly to a fire fighting ladder.

(Prior Art) A well-known stretchable ladder device, in particular, a fire ladder has a stretchable ladder portion provided with a lower chord member and a lateral upper chord member and an upper chord member that can be used as a handrail. There is. The foot pedal is located in the lower chord. In the unstretched state of the ladder device, the ladder parts are nested in each other, with the basic ladder part surrounding the entire other ladder part in cross section and the ladder part associated with the tip of the ladder being the innermost part. Position (see German patent publication 33 26 644, German patent 955 380, German patent publication 32 32 299). The torsional strength of such a ladder device, in which all the ladder parts have a U-shaped cross-sectional profile, is only moderate. Especially the first
Due to the small height of the ladder part, when lateral stress occurs, for example, when the rotating motion is accelerated or decelerated by a life basket or elevator suspended at the tip of the ladder,
It receives a very large twisting action. Even when doing small work in the life basket, due to the reaction force, the first ladder part undergoes an undesirably large twisting action in the life saving operation.
This is very uncomfortable and disturbing for the person in the life basket or elevator. In order to increase the torsional strength, in the prior art, the stepper in the lower chord member and the lateral braces provided between the upper chord member and the lower chord member are formed so as to be relatively stable. The vertical member has a relatively complicated contour in cross section. Therefore, the structural weight becomes large and the production cost becomes high. Moreover, since the cross section of each ladder portion has an open U-shaped contour, the torsional strength is not so great.

(Problems to be Solved by the Invention) An object of the present invention is to provide a ladder device having an expandable ladder portion of the type described in the preamble, which has a simple structure, and in particular, it is difficult for the conventional technique to have a large size. To provide a ladder device capable of forming the first ladder portion so as to have a large torsional strength.

(Means for Solving the Problems) The object of the present invention is achieved by the features described in the characterizing part of claim 1.

That is, according to the present invention, the first ladder portion, that is, the ladder portion which is the uppermost or the most forward portion when the ladder device is stretched, has the stepper fixed between the upper chord members of the first ladder portion. Characterized in that it is formed as a lattice-like carrier closed in cross section, and that the upper chord member of the first ladder portion has at least one lateral rocking member that can rock up and down and serve as a handrail. .

The ladder device of the present invention is defined in claims 2 to 14.
It is desirable that it is the mode described in the section.

In the ladder device of the present invention, a step is arranged between the upper chord members to form a lattice-shaped carrier having a closed cross section with the first ladder portion, and the torsion strength of the first ladder portion is increased. In addition, since swingable side members are provided for the handrail, it is possible to meet the requirements of German Industrial Standard (DIN) 14701 regarding the safety of the fire ladder. Since the swingable and fixed handrails are attached to the upper chord member in the footstep area, the ladder can be easily moved up and down. The handrails can be supported by hand and can be moved into place from above or below the first ladder section by springs or pneumatically, hydraulically or electrically. It is also possible to provide a folding handrail inward,
When the first ladder portion is extended, it can be swung upward as described above. At this time, the torsional force receiving member for the cross section of the longitudinal member with respect to the open cross sectional profile of the first ladder portion can be omitted. Instead, the longitudinal members are bracingly welded in the horizontal position, thus closing the grid carrier. Another feature is that the vertical members can be used as a conduit. Therefore, a ladder device that is strong against torsion can be obtained, and the elevator work can be performed by folding the handrail. By optimizing the components used, the weight of the first ladder part can be made suitable for the robot welding operation. At the beginning and the end of the first ladder part, additional intermediate- or bridge treads are provided, either from the adjacent ladder part, i.e. the ladder part in which the treads are fixed to the lower chords, or from the adjacent life basket. It has become possible to form a pedestrian's footpath. According to the present invention, it is possible to satisfy the demand (for example, a three-person basket) that has been significantly increased in recent years with respect to the net load of a life preserver. According to the present invention, since the twisting motion and the twisting angle are substantially reduced, it is possible to provide comfort to the person in the life basket and the elevator. The shaking motion that occurs at the tip of the ladder is also small. The water drainage mechanism in the first ladder section can be integrated in a vertical member having a relatively simple cross-sectional profile, which makes the structure particularly compact. Great torsional strength,
That is, a large resistance moment against the reaction force is particularly advantageous when performing a monitoring operation.

 Next, embodiments of the present invention will be described with reference to the accompanying drawings.

(Example) A ladder device in the form of a fire ladder having three ladder portions 2 and 3 shown in FIGS. 1 and 2 has an upper chord member 5 and a lower chord member 4, and the ladder member. The parts are telescopically inserted into one another in the area of the lower chords 4 and are guided longitudinally by a slider 22. The innermost, i.e. the first ladder section 2 is associated with the ladder tip 19 and is completely surrounded by the outer ladder section 3 in cross-section so that the upper chords 5 are now in one plane. ing.

Both outer ladder sections 3 are basically formed in the same way,
And a ladder foot that extends laterally in the area of the lower chord member 4
A lateral longitudinal member 21 having an asymmetrical profile, connected to one another by means of 16, and a lateral longitudinal member 20 having another profile in the area of the upper chords 5, which longitudinal member is a lateral member. It is rigidly connected to the longitudinal members 21 of the lower chord member 4 through the braces 6. The outer ladder portion 3 forms an upper open U-shaped cross-sectional profile.

The first ladder section 2 associated with the ladder tip 19 has a closed cross-sectional profile, as opposed to the other ladder sections 3. Each first
The ladder section is provided with a lower profile 23 having a simple contour, which is connected to each other by braces 15.
However, the longitudinal members 23 and the braces 6 of the first ladder portion 2 which are almost the same as the other ladder portions 3 are designed so that their dimensions are relatively small. An essential feature of the present invention is that the upper longitudinal members 20 of the first ladder section 2 are connected laterally by the step members 7. The foot 7 is substantially first
It is used to increase the torsional strength of the ladder part 2.
Alternatively, it is supported by lower vertical members 14 in the area of the vertical plates. The vertical member 14 has a closed rectangular outline and is arranged in an upright shape. Due to this closed profile, the longitudinal member 14 can be used as a conduit in the area of the first ladder part 2.

When stretching the ladder parts 2 and 3 to lengthen the ladder device 1, the operator first uses the lower foot 16 of the ladder part 3 and, in the area of the first ladder member part 2, the foot 7 To do. The connection between the upper chord member 5 and the lower chord member 4 is formed at the longitudinal end of the first ladder portion 2 as shown in FIG. 3 in order to form a transition between the lower foot member 16 and the upper foot member 7. A bridge footing 8 is provided for the lateral braces 6.

Further, the upper chord member 5 of the first ladder portion 2 is provided with two rocking members 10 capable of rocking up and down, and the rocking members are also in the upper rocking position as shown in FIG. Is a handrail used by workers. The rocker 10 shown in FIG. 1 has a connecting rod 24, the rocking axis 11 of which extends parallel to the upper longitudinal member 20, so that the rocker 10 is indicated by the arrow A in FIG. It is possible to oscillate between a swing position, which is substantially parallel to the foot 7 shown, and a substantially vertical handrail position. Contrary to this, the connecting rod 24 of the rocker 10 shown in FIG. 3 has a rocking axis 12 extending toward the foot 7, so that the rocker 10 is indicated by the arrow B.
In the shape of a parallelogram as shown in Fig. 1, it is possible to oscillate in the longitudinal direction of the first ladder part 2 and this movement is caused by the drive 1
3, for example by means of a piston-cylinder arrangement (in the case of a hydraulically actuated unit) arranged between the connecting rod 24 and the foundation of the first ladder part 2. In another embodiment, the swinging of the handrail can be done manually by means of a spring. In addition, it is desirable to provide a stop device 18 in order to secure the final position of the rocking member 10.

As shown in FIG. 2, the present invention has the oscillating member 10 as described above, but it is also suitable for use as the ladder device 1 equipped with the elevator 9 in some work. In this case, the elevator 9 is moved after rocking the rocker 10 on the upper chord 5 of each ladder section 2 or 3, respectively.

The rocking member 10 preferably has a connecting rod 24 having a height h ≦ 280 mm. The preferred inner width b of this rocker 10 is at least 450 millimeters (FIG. 4).

The embodiment can be modified without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a ladder device according to the present invention, FIG. 2 is a view showing another ladder device similar to FIG. 1, and FIG. 3 is a schematic upper part of the ladder device shown in FIG. Side view, Fig. 4 is second
The enlarged front view of the apparatus shown by the figure. 1 ... Ladder device, 2, 3 ... Ladder part, 4 ... Upper chord material, 5
…… Lower chord material, 6 …… Structure, 7 …… Treader, 9 …… Elevator, 10 …… Swing material, 13 …… Track device, 14 …… Vertical material,
15 ... Bruise, 19 ... tip.

Claims (14)

[Claims] 1. A ladder device (1) having a stretchable ladder portion (2, 3), in particular a fire ladder, each ladder portion (2,
3) has a lower chord member (4) and an upper chord member (5), and the lower chord member and the corresponding upper chord member are firmly connected to each other by braces (6). 2), that is, when the ladder device (1) is stretched, the ladder portion which is the uppermost or the frontmost portion when the ladder device (1) is stretched has a step (7) fixed between the upper chord members (5) of the first ladder portion. , Formed as a closed lattice carrier when viewed in cross section,
The ladder device, wherein the upper chord member (5) of the ladder portion (2) has at least one lateral rocking member (10) which can rock up and down to serve as a handrail. 2. The ladder device according to claim 1, wherein the entire upper chord member (5) of the ladder portion including the first ladder portion (2) is formed as a support member for the elevator (9). Ladder device. 3. A ladder device according to claim 1 or 2, wherein the lateral rocking member (10) extends in a longitudinal direction of the first ladder portion (2). ),
A ladder device adapted to be swingable from a lowered position substantially parallel to the step (7) to an upper outer handrail position by about 90 degrees. 4. The ladder device according to claim 1 or 2, wherein the lateral oscillating member (10) has a plurality of oscillating axes (12) parallel to the step (7). A ladder device having a lateral swing member that can swing in the vertical direction of the first ladder portion (2). 5. The ladder device according to any one of claims 1 to 4, wherein the lateral rocking member (10) is provided.
However, the ladder device is adapted to be stopped at least at the handrail position which is swung upward. 6. The ladder device according to any one of claims 1 to 5, wherein the lateral rocking member (10) is provided.
A ladder device in which the spring can be manually swung via a spring. 7. The ladder device according to any one of claims 1 to 5, wherein the lateral rocking member (10) is provided.
A ladder device that can be swung by a power drive device (13). 8. A ladder device according to claim 7, wherein the power drive device (13) has a shock absorber. 9. The ladder device according to claim 7 or 8, wherein the power drive device (13) is the first drive device.
A ladder device adapted to be actuated by a stretching movement of the ladder portion (2). 10. The ladder device according to any one of claims 7 to 9, wherein the power drive device (13) can be remotely controlled from a lifesaving cage or a main control room. Ladder equipment. 11. The ladder device according to any one of claims 1 to 10, wherein the lower chord member (4) of the first ladder portion (2) has two lateral longitudinal members ( Ladder device having 14) and these lateral longitudinal members being rigidly connected to each other by braces (15). 12. The ladder device according to claim 11, wherein each of the lateral longitudinal members (14) has a closed cross-sectional profile. 13. The ladder device according to claim 11 or 12, wherein each of the lateral vertical members (14) is formed by a rectangular mold member. 14. A ladder device according to any one of claims 11 to 13, wherein each of the lateral longitudinal members (14) is formed as a water conduit.