JPS6311505B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceiling ladder unit, and more particularly to a unit of this type that is easy to fold and store.

In the case of ceiling ladder units currently on the market, the ladder consists of a plurality of ladder segments connected via hinge fittings, with the uppermost ladder segment being pivoted to the ceiling and supported by a tension spring. It is biased upward and can be folded and stored in a predetermined storage area on the ceiling. The above tension spring is
The dead point (maximum tensile state) is crossed between the used state and the end state of the ladder (actually a position close to the used state), and the maintenance of the used state is due to the existence of this dead point. being done.

However, the above-mentioned unit has the disadvantage that the angle of the ladder changes depending on the location where the ladder is actually used, making it troublesome to preselect the spring to be used or adjust the spring pressure on site. Furthermore, when folding the ladder at the end, if the ladder is allowed to go beyond the dead center mentioned above during the folding process, the ladder will rise halfway until it reaches the ceiling, and the ladder will not be able to complete the folding process. The problem also arose that it became extremely troublesome.

The present invention has been made based on this point of view, and provides a ceiling ladder that allows reliable folding and final folding work to be easily performed without having to pay particular attention to the selection and adjustment of spring pressure during manufacturing or on-site construction. The purpose is to provide units.

In order to achieve this, in the present invention, in addition to the above-mentioned conventional structure, a first lever that can be bent at the middle is interposed between the uppermost ladder segment and the ceiling, and the first lever is Both ends are pivoted to the ladder segment and the ceiling, respectively, and the ladder segment is pivoted to the ladder segment adjacent to the uppermost ladder segment or to a hinge fitting that is folded together with the ladder segment. 2
A lever is connected to the first lever so as to be slidable and swingable within a certain range, so that when the adjacent ladder segments are folded, the second lever pushes the first lever and bends it. It is characterized by.

The present invention will be described in detail below according to preferred embodiments shown in the accompanying drawings.

FIG. 1 is a side view showing one embodiment of the unit of the present invention in a state in which a ladder is used.
indicates the ceiling and 20 indicates the ladder. A space defined by a frame 11, that is, a storage area 12 is formed in the ceiling 10, in which the ladder 20 ends in a manner described later. be supported.

The ladder 20 includes three ladder segments 21 and 2 that are rotatably connected to each other by hinge fittings 24 and 25.
It consists of 2,23. Therefore, the lowermost segment 21 can be folded and superimposed on the intermediate segment 22 by rotating it counterclockwise in the figure via the metal fitting 24, and the intermediate segment 22 can be folded over the metal fitting 25. It can be folded and stacked on top of the uppermost segment 23 by turning it clockwise in the figure.

The uppermost ladder segment 23 connects its upper end to the ceiling 1.
A tension spring 2 is pivotally supported on a frame 11 of 0 and is hung between the frame 11 and both sides of the split body 23.
6, it is urged upward. The spring pressure of the tension spring 26 is preset to be strong enough to pull the ladder 20 up to the ceiling 10 in its free state. Therefore, if the ladder 20 is released with each of the ladder segments 21, 22, and 23 folded, the ladder 20 will be stored and held in the storage section 12 of the ceiling 10 in the folded state as shown in FIG. It will be done.

Further, a first lever 27 is disposed between the center of both sides of the ladder segment 23 and the center of both sides of the frame 11 of the ceiling 10, and serves as a support rod interposed between the two in the upright state. Ru. The first lever 27 is bendable at an intermediate pivot portion 27a,
Its upper end is pivotally connected to the frame 11 via an adjustment mechanism 28, and its lower end is pivotally connected to the segment 23 near the position where the tension spring 26 is applied. Adjustment mechanism 2
8, as shown in FIG. 3, consists of a combination of a plurality of holes 30 in a metal fitting 29 attached to the frame 11 and a plurality of holes 31 drilled in the upper end of the first lever 27. The adjustment is made by selecting the hole to be installed depending on the required angle or height of the ladder 20. In the same mechanism 28, coarse adjustment is performed by shifting the mounting hole 31 on the lever 27 side, and fine adjustment is performed by shifting the mounting hole 30 on the metal fitting 29 side.

Further, a coaxial small lever 32 is connected to the lower end of the first lever 27 and rotates integrally therewith.
A pin 33 is attached to the free end of the small lever 32, and this pin 33 is attached to the portion 25 of the hinge fitting 25 that connects the segments 23 and 22 of the ladder 20 on the segment 22 side.
a via a second lever 34. Second
The lever 34 has one end connected to the part 25a of the hinge fitting 25.
The other end is provided with a long hole 35,
The pin 33 is slidably received within the elongated hole portion 35. Therefore, when the segment 22 of the ladder 20 is rotated and folded against the segment 23, the portion 25a of the hinge fitting 25 is also rotated, and the second lever 34 is pushed toward the small lever 32 side. Therefore, the second lever 34 is connected to the pin 33 at the edge of the elongated hole 35.
, and rotate the lower part 27b of the first lever 27 clockwise in the figure via the small lever 32. As a result, the first lever 27 is bent at the pivot portion 27a, and its function as a supporting rod is released.

In the unit configured as described above, when the ladder 20 is used as shown in FIG.
By acting as a support rod, the ladder 20 can be maintained in a used state. Further, when the folding is completed, the ladder 20 will not rotate upward by itself due to the above-mentioned action of the first lever 27 until the intermediate ladder segment 22 is folded, and the folding operation can be carried out reliably. I can do it. However, when the split body 22 is folded, the first lever 27 is bent and its function as a supporting rod is naturally released, so that the split body 2
By leaving the ladder 20 to the action of the tension spring 26 after folding the ladder 20, the end of the ladder 20 can be quickly lowered.

In the above embodiment, the second lever 34 is pivotally attached to the portion 25a of the hinge fitting 25, but the same effect can be obtained even if the second lever 34 is pivoted to the portion 22 itself. It goes without saying that the type of ladder is not limited to the three-part type, but in this case as well, the second lever 34 can be attached to the ladder part adjacent to the topmost ladder part, or to the ladder part that folds together with this. shall be pivotally connected to the part of the hinge fitting that is attached.

According to the unit of the present invention having the above configuration, if the spring pressure of the tension spring is set in advance to be sufficient to lift the ladder, the first lever acts as a support rod and the second lever etc. Due to the function of canceling this action, even if the spring pressure is a little strong, it does not cause any particular trouble when using the ladder or climbing it down. Therefore, unlike conventional units, it is not necessary to pay special attention to the selection and adjustment of the spring pressure of the tension spring during manufacturing or on-site construction. In addition to this, in this unit, the above-mentioned tension spring acts as the uppermost segment of the ladder is folded, so that the folding of the ladder and its ending in the designated storage area on the ceiling are not easy. can be carried out continuously, reliably and quickly.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the ladder unit of the present invention when the ladder is in use, Fig. 2 is a side view showing the same unit with the ladder fully folded, and Fig. 3 is a schematic diagram showing the adjustment mechanism of the same unit. 10... Ceiling, 12... Storage section, 20... Ladder, 21, 22, 23... Ladder segment, 24, 25
...Hinge fitting, 26...Tension spring, 27...
First lever, 28...adjustment mechanism, 34...second lever.

Claims (1)

[Claims] 1. A ladder 20 is formed from a plurality of ladder segments 21, 22, 23 connected via hinge fittings 24, 25, and the uppermost ladder segment 23 is pivoted to the ceiling 10. In the ceiling ladder unit, the ladder unit is biased upward by a tension spring 26, and the ladder unit 20 can be folded into a predetermined storage part 12 of the ceiling 10. 1 lever 27 is interposed between the uppermost ladder segment 23 and the ceiling 10,
Both ends of the first lever 27 are connected to the ladder segment 2, respectively.
3 and the ceiling 10, and the ladder segment 22 adjacent to the uppermost ladder segment 23 or the hinge metal fitting 25 folded together therewith.
A second lever 34 pivotally connected to the portion 25a of
is slidably and swingably connected to the first lever 27 within a certain range, and when the adjacent ladder segments 22 are folded, the second lever 34 is connected to the first lever 27.
A ceiling ladder unit characterized by being bent by pressing a lever 27.