JPH0640880Y2 - Evacuation suspension ladder - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention [Industrial field of application] The present invention relates to a pantograph-type foldable evacuation suspension ladder, which is used to improve stability of the ladder in an extended state. And is effective.

[Prior Art and Problem] A pantograph-type foldable evacuation suspension ladder is well known in the art (Japanese Utility Model Publication No. 59-163100).
It is installed and used on the veranda of high-rise houses.

In this structure, one end of the uppermost mold bar 5a '[see FIG. 3 (FIG. 5 of the above publication, the same applies in this section below)] is pivotally supported by a support bracket via a support shaft, and the bar 5a' The die bars of the tiers are connected by parallel bars 5a ″, 5a, and the steps of the tiers such as the uppermost tier and the second tier are provided at the lower ends of the tiers of the die bars.

The evacuation ladder 5 extends in a pantograph shape, or the bars at the respective steps are folded and compactly folded, and the entire evacuation ladder 5 is stored in the frame 1.

The evacuation ladder 5 has a foldable connecting bar 8 that regulates the degree of extension, and by regulating the degree of extension by this, a predetermined distance is provided between the step at the lower end of each bar and the wall surface of the building. Hold it.

Since the connecting bar 8 of the conventional evacuation ladder is not an indispensable element as a ladder but an additional element for restricting the extension of the parallel links, the existence of this makes the ladder structure complicated. It will be. Further, these ladders are usually made of an aluminum alloy in order to secure touch resistance and reduce weight, and are made of thin metal strips. Further, the bars 5a 'in each stage and the connecting bars 5a "parallel to each other,
The 5a are connected to each other by rivets and bolts, but if the connecting part is strongly tightened, the ladder will drop due to its own weight and cannot extend, so some play is required. Due to the above circumstances, this type of ladder is poor in rigidity in the twisting direction, the left-right direction, and the front-rear direction, and is therefore unstable against external force in these directions. This instability causes the ladder to wobble, making the evacuees descending mentally uneasy and their descent movements actually becoming unstable.

This is a serious problem for the safe and prompt evacuation of the young and the elderly.

INDUSTRIAL APPLICABILITY The present invention improves the rigidity of the evacuation ladder against external force in these directions by improving the rigidity in the twisting, the left-right direction, and the front-rear direction to prevent the ladder from wobbling and restrict the extension degree of the evacuation ladder. The object is to simplify the means and simplify the structure of the ladder.

(2) Configuration of device [Means taken for solving the problem] The means taken for solving the above-mentioned problem is constituted by the following elements (a) and (b).

(B) Each of the aluminum alloy parallel linking links that sequentially connect the mold bars at each stage are composed of two inner and outer link bars. (2) The stoppers were installed at the tips of the left and right arms of the (b) -shaped bar toward the inside of the ladder.

[Operation] By forming each connecting link by the inner and outer link bars that are separated from each other, the rigidity of the connecting link against torsion and bending is significantly improved, and the left and right arms of each mold bar are connected to the inner and outer link bars. Since it is sandwiched by, the backlash between the connecting link and the left and right arms of each mold bar is significantly reduced.

Further, when the ladder is extended, stoppers protruding inward from the left and right arms of the mold bar come into contact with the back surface of the inner link bar to regulate the extension of the ladder. When the weight of the descendant is applied to the ladder, the stopper is strongly pressed against the back surface of the inner link bar and frictionally engaged with the back surface of the inner link bar.

By increasing the rigidity of the connecting link, reducing the play between the connecting link and the left and right arms of the mold bar, and the strong frictional engagement force between the stopper on the upper end of the arm of the mold bar and the back surface of the inner link bar, the ladder is twisted in the extended state, The rigidity in the left-right direction and the front-back direction is significantly improved.

As described above, the problems of the present invention are sufficiently solved by the above means.

Example Next, an example will be described with reference to FIG.

The basic structure of the ladder is the same as that of the prior art. The ends of the left and right arms 2 and 3 of the mold bar 1 are bent inward at a right angle to form a stopper 4. A step 6 made of an aluminum alloy having a sectional shape is fixed to the stepping portion 5 of the mold bar 1.

Connection link 10 that connects the upper and lower mold bars 1, 1 in sequence
Is made of aluminum alloy and has two internal and external link bars 11,
And the left and right arms 2 and 3 of each mold bar 1 are sandwiched between the link bars 11 and 12, bolts,
Alternatively, they are connected by rivets 13 and 14. Of this,
The outer link bars 11 and 12 sandwich the inner and outer surfaces of the arms 2 and 3 in a wide area.

When the ladder is extended, the connecting link 10 will be
The arm 15 is rotated counterclockwise with respect to the arms 2 and 3, and the back surface 15 of the inner link bar 12 contacts the upper end surface of the stopper 14. This regulates the extension of the ladder,
The space between the upper and lower connecting links 10 parallel to each other is maintained at a predetermined size.

Since the connecting link 10 has a double structure separated from each other, the rigidity against bending moments in the left-right direction and the front-rear direction is extremely large.

(3) Effect of the device The rigidity of the ladder in the extended state can be remarkably improved in the left-right, front-rear, and torsional directions by means of an extremely simple mechanism, which makes it safe for young children and seniors to use a stable suspension ladder. Being able to descend is the greatest effect of the present invention.

Increasing the wall thickness of the prior art connecting link (consisting of a single link bar) (increasing the width results in a result contrary to the requirement for compact folding).
Thus, the rigidity of the connecting link can be improved, but the effect is extremely small. Because arm 2
It is not possible to reduce the rattling of the connecting part with (If the tightening force of the connecting part with bolts and rivets is increased, the extension operation of the ladder due to free fall will be hindered, so a certain amount of play is indispensable. ), Contribution to the rigidity of the ladder in the left-right direction is small. On the other hand, according to the present invention, the rigidity of the ladder can be remarkably improved by forming the connecting link with the two link bars in combination with the frictional engagement of the stopper with the back surface of the link bar.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is a side view of a conventional technique. In the figure, 1-type bar, 2, 3-arm, 4-stopper, 5-stepping part, 6-step, 10-connection link, 11, 12-link bar, 13, 14 ... … Bolts or rivets, 15 …… on the back of the inner link bar.

Claims (1)

[Scope of utility model registration request] 1. In a pantograph-type foldable evacuation suspension ladder, each connecting link which is made of aluminum alloy and is parallel to each other and sequentially connects the die bars of each stage is constituted by two inner and outer link bars, An evacuation suspension ladder in which the left and right arms of the mold bar are sandwiched between the inner and outer link bars, and stoppers project from the ends of the left and right arms of the mold bar toward the inside of the ladder.