JPH0421390Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a ceiling ladder device that can be easily replaced with a tension spring having an appropriate tension depending on the weight of the canopy.

(Prior art) The canopy of a ceiling ladder device has a constant weight that is unrelated to the material of the floor, like the evacuation staircase device described in Publication No. 14320/1982, and the canopy of the ceiling ladder device has a constant weight that is independent of the material of the floor. The weight varies depending on the material of the ceiling to which it is installed.

Therefore, when attaching the ceiling ladder device to the ceiling, use a tension spring that is optimal for the weight of the ladder portion including the weight of the canopy, or adjust the tension of the tension spring to reduce the tension of the canopy. It needs to be easy to open and close.

Due to this need, conventional ceiling ladder devices change the tension by changing the latching position of one end of the tension spring, as disclosed in Figure 3 of Japanese Utility Model Publication No. 58-11920. That's what I do.

(Problem that the invention attempts to solve) However, the tension springs used in ceiling ladder devices are extremely strong, and at the installation site, the tension springs must be pulled and stretched directly by hand. It is extremely difficult to adjust the tension by changing the stop position, and it has not been possible to easily secure an appropriate tension by the tension spring.

The present invention focuses on obtaining an appropriate tension without changing the latching position of the tension spring, and allows the tension of the tension spring to be easily adjusted or replaced.
It is an object of the present invention to provide a ceiling ladder device that can ensure optimal balance corresponding to weight.

(Means for Solving the Problems) In the ceiling ladder device of the present invention, a canopy b to which a ladder segment d is attached is pivotally connected to the lower part of one end of a box frame a as a fulcrum so that the canopy b can be opened and closed. In a ceiling ladder device controlled by a tension spring i connecting both sides of the free end of the canopy b and both inner walls of the box frame a, one end of the tension spring i and the box The frame a is connected to the inner wall by a connection in which a locking hole 11 for locking one end of the tension spring is drilled at one end and a plurality of adjustment holes 10 for selectively fixing to the inner wall are arranged at the other end. This is characterized in that it is carried out via a rod.

(Example) A ceiling ladder device according to an example of the present invention includes a first
As shown in Figures 3 to 3, the canopy b to which the ladder segment d is attached is pivotally attached to the lower part of one end of the box frame a so as to be freely openable and closable, and the canopy b is pivoted to the inner walls on both sides of the box frame a near the pivot point. One end of the arm rod f is freely pivotally connected, and the other end of the arm rod is pivotally connected to a link h which is pivotally connected to both sides of the free end of the canopy b, and the arm rod f is connected above the one end pivot point. A tension spring i is stretched between the inner wall of the box frame a and the rear end of the arm rod f.

The box frame a is rectangular and open at the top and bottom, and as shown in Figure 1, a canopy b is attached to the lower part of one end so that it can be opened and closed using a hinge 1, and fixed plates c are attached to the inner walls on both sides of the other end so as to face each other. It is something.

The canopy b is made by pasting the ceiling member to which it is attached, and as shown in Figure 1, it is attached with washers 2 in a folded state of a set of rectangular three-fold ladder segments d. A key fitting 3 is attached to the free end, and a mounting plate e for pivotally attaching one end of the link h is fixed to the upper surface of both sides near the free end.

Then, as shown in FIGS. 4 and 5, the lower shaft rod 4 to which the arm rod f is pivoted is inserted and fixed slightly to the right of the lower center of the fixing plate c, and the upper center of the fixing plate c An upper shaft rod 5, to which a connecting rod g is pivotally attached, is inserted and fixed slightly to the left, and a push plate 6 is stretched across these upper and lower shaft rods 5, 4 and attached.

As shown in FIGS. 1 and 7, the arm rod f has one end pivotally connected to the lower shaft rod 4, and the other end pivotally connected to the first shaft 6a of the link h. A hook 7 is provided on the top surface.

The link h, as shown in FIG.
It is pivoted to the mounting plate e.

As shown in FIG. 7, the mounting plate e is fixed to the upper surface of the free end of the canopy b, and has a stop pin that pivots one end of the link h by a second shaft 8 and stops the rotation of the link h. 9.

As shown in Fig. 4, the connecting rod g has a plurality of adjustment holes 10 drilled from one end to the center and a locking hole 11 at the other end, so that the adjustment hole can be placed at any position. The upper shaft rod 5 is inserted through the upper shaft 10, and the connecting rod g is pivotally connected thereto.

The tension spring i has one end connected to the hooking hole 1 of the connecting rod g.
1, and the other end is attached to the hook part 7 of the arm rod f.
A protective tube j is attached to cover the tension spring i, and the canopy b is pulled up via the arm rod f and the link h.

In the ceiling ladder device configured as described above, the same ceiling material as the ceiling is arranged on the lower surface of the canopy b, and the box frame a is inserted into the opening of the ceiling so that the lower surface of the canopy b is flush with the ceiling surface. Store and fix it in the section.

Then, depending on the material of the ceiling to be installed,
Ensure proper tension.

At this time, if the ceiling material attached to the lower surface of the canopy b is heavy, remove the upper shaft lever 5 and replace the tension spring i with no tension acting on it, or replace the tension spring i with a new one. In the figure, if the connecting rod g is moved to the left and the upper shaft rod 5 is inserted and pivoted into the adjustment hole 10 on the right side, and the ceiling material attached to the lower surface of the canopy b is light, By inserting the upper shaft lever 5 into the adjustment hole 10, the tension can be increased or decreased without changing the latching position of the tension spring i.

After that, when the key metal fitting 3 of the canopy b is unlatched and the canopy b is pulled down, the canopy b is opened around the mounting hinge 1, and the lower end of the connecting rod h is attached to the stop pin 9 of the mounting plate e. They come into contact and are stopped at a certain opening angle, resulting in the state shown in FIG.

Then, the ladder segment d attached to the top surface of the canopy b is extended, and the ladder segment d is spanned between the floor surface 12 and the attic space 13, and is used as shown in Fig. 3. .

After use, fold the ladder segment d into the state shown in Fig. 1, lift the canopy b, push the canopy b into the box frame a, lock the key metal fitting 3, and put it into the state shown in Fig. 2. As shown above, the canopy b is stored in the box frame a.

(Operation and Effect of the Invention) In the ceiling ladder device of the present invention, the canopy b to which the ladder segment d is attached is pivoted to be freely openable and closable using the lower part of one end of the box frame a as a fulcrum, and the opening and closing of the canopy b In a ceiling ladder device controlled by a tension spring i connecting both sides of the free end of b and both inner walls of the box frame a, one end of the tension spring i and the inner wall of the box frame a. The connection is made through a connecting rod g, which has a locking hole 11 at one end for locking one end of the tension spring and a plurality of adjustment holes 10 arranged in a row at the other end for selectively fixing it to the inner wall. Therefore, if the ceiling material attached to the underside of the canopy b is heavy, remove the upper shaft lever 5 and replace the tension spring i with no tension acting on it. Or, in Fig. 4, if the connecting rod g is moved to the left and the upper shaft rod 5 is inserted and pivoted into the adjustment hole 10 on the right side, and the ceiling material attached to the lower surface of the canopy b is light, the same applies. By inserting the upper shaft lever 5 into the adjustment hole 10 on the left side, the tension can be increased or decreased without changing the hanging position of the tension spring i or directly holding and pulling the tension spring i. It is possible to provide a ceiling ladder device in which the tension of the tension spring can be easily adjusted or replaced, and an optimal balance corresponding to the weight can be ensured.

[Brief explanation of the drawing]

Figure 1 is a side view of the ceiling ladder device according to the present invention with the canopy open, Figure 2 is a side view of the ceiling ladder device of the present invention in a folded and stored state, and Figure 3 is how the device is used. Fig. 4 is a partially omitted enlarged side view of the vicinity of the fixing plate according to the present invention; Fig. 5 is a sectional view taken along the - line in Fig. 4; Fig. 6 is the fixing with the canopy open. A partially omitted enlarged side view of the vicinity of the plate, and FIG. 7 is a partially omitted enlarged side view of the vicinity of the connecting rod with the canopy opened. a...box frame, b...canopy, c...fixing plate, d...
...Ladder segment, e...Mounting plate, f...Arm rod, g...
Connecting rod, h... link, i... tension spring, j
...Protection tube, 1...Mounting hinge, 2...Washer, 3...
...Key fitting, 4...Lower shaft lever, 5...Upper shaft lever, 6...
Push plate, 6a...first shaft, 7...hanging portion, 8...second shaft, 9...stopping pin, 10...adjustment hole, 11...
...Latch hole, 12...floor, 13...behind the ceiling.

Claims (1)

[Scope of utility model registration request] A canopy b to which a ladder segment d is attached is pivotally connected to the bottom of one end of the box frame a as a fulcrum so that it can be opened and closed, and opening and closing of the canopy b connects the free end of the canopy b to the inner wall of the box frame a. In a ceiling ladder device that is now controlled by a tension spring i, the connection between one end of the tension spring i and the inner wall of the box frame a is provided with a latch for hanging one end of the tension spring. A hole 11 is drilled at one end, and a plurality of adjustment holes 1 are provided at the other end for selectively fixing to the inner wall.
A ceiling ladder device characterized in that the ladder device is operated via connecting rods g arranged in a row.