JPH0318573Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a locking member that supports a ceiling ladder device, which is used for climbing up and down the attic space, in an expanded and extended state.

Conventionally, a folding device consisting of a ladder section with multiple upper and lower steps,
Ceiling ladder devices with a deployable ladder body are known. In this ladder device, when in use, each ladder section is unfolded and installed diagonally between the ceiling and the floor, and when not in use, each ladder section is folded and stored in the attic. This ladder device is supported by the frame of the ceiling opening by a bendable hanging link in the middle part, and when in use, this hanging link comes into contact with a locking member and the ladder device is expanded and extended. The state is maintained. In addition, it is necessary to adjust the protrusion angle of the ladder device according to the distance between the ceiling and the floor, and therefore, as shown in FIG. A nut 4 that inserts a threaded rod 43 integrally formed with the stopper piece 42 and is screwed onto the threaded rod 43.
A locking member 46 is used in which the protrusion 41 is held between the protrusions 4 and 45. That is, by loosening one of the nuts 44, 45 by a predetermined amount and rotating and tightening the other nut in the same direction, the threaded rod 43 is moved to shift the position of the stopper piece 42, and the suspension link 9 is moved. The extension angle of the ladder body is adjusted by changing the rotation locking position of the ladder body. In the locking member 46, in order to move the threaded rod 43, both nuts 44 and 45 that clamp the protrusion 42 must be screwed forward in accordance with the amount of movement of the threaded rod 43, and the operation is complicated. It is. Further, if the nut 45 on the outside of the projection piece 41 rotates and loosens due to the impact load repeatedly applied to the stopper piece 42, the locking state of the stopper piece 42 cannot be maintained, so the nut 45 is configured as a double nut. There is a need to. Therefore, there is a drawback that the work of loosening and threading the double nut 45 when adjusting the projecting angle becomes extremely complicated. Furthermore, the nut 44 inside the protruding piece 41 is located in the middle of the threaded rod 43, and is located in a narrow space, making it difficult to rotate the nut 44.

This invention was made to eliminate the above-mentioned drawbacks, and provides a locking member for a ceiling ladder device that allows stepless adjustment of the extension angle of the ladder body with an extremely simple operation. be.

That is, the locking member of this invention is folded and stored above the opening when not in use, between the edge frame attached to the opening in the ceiling, and the edge frame and the floor when in use. A ladder device is provided with a ladder main body consisting of a plurality of upper and lower ladder sections that can be expanded and spanned, and is supported by the edge frame via a bendable and extensible hanging link in the middle section, and is supported in an expanded and extended state. The locking member includes a base frame having a pair of opposing upright walls, a screw shaft penetrating through a hole formed in both the upright walls, and rotatably supported by the base frame. , has a slide block that is screwed onto the screw shaft and moves forward as the screw shaft rotates, and this slide block comes into contact with the suspension link and prevents its rotation when the ladder main body is extended and extended. A protrusion is formed, and the screw shaft is provided with a rotation operation part.

Embodiments of this invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 designates an edge frame attached to an opening in a ceiling 6, 2 a canopy pivotally mounted on the edge frame 1 so as to be openable and closable, and 3 a ladder body. This ladder main body 3 has three upper, middle and lower ladder parts 3a, 3b,
3c are connected to each other so that they can be folded and expanded via hinge fittings 4a and 4b, and the upper ladder section 3a is connected to the canopy 2 via brackets 5a and 5b.
is fixed to the top surface of. In addition, this ladder main body 3 is connected to each ladder main body 3a, 3b, 3c when in use.
is unfolded and spanned between the ceiling 6 and the floor 8, and is configured to be folded onto the canopy 2 and stored above the opening in the ceiling 6 when not in use.

A hanging link 9 is provided between the edge frame 1 and the canopy 2, and the ladder device is supported by the edge frame 1 via this hanging link 9. That is, the suspension link 9 includes an upper member 11 which is pivotally supported by a pin 10 at the intermediate portion and is connected to each other so as to be bendable and extensible.
and a lower member 12, the upper end of the upper member 11 is pivotally supported on a bracket 13 attached to the edge frame 1, and the lower end of the lower member 12 is pivoted on a bracket 14 attached to the upper surface of the lid 2. supported. When the ladder device is stored, the hanging link 9 is bent so that the ladder main body 3 is positioned above the opening in the ceiling 6, and when the ladder device is used, the hanging link 9 is bent as the ladder main body 3 is extended. is the upper member 11
It is configured such that it rotates around the upper end pivot point and extends, and the extended state is maintained by a locking member 20 attached to the edge frame 1. Note that a pair of hanging links 9 are provided on either side of the ladder main body 3.

As shown in FIG. 2, the locking member 20 includes a base frame 24 attached to the edge frame 1, a bolt 27 rotatably held by the base frame 24, and a threaded shaft 25 of the bolt 27. It is equipped with a slide block 28 that is mounted together. The base frame 24
has a pair of opposing upright walls 22, 22 protruding from a bottom plate 21, and a side wall 23 connecting the both upright walls 22, 22. The bolt 27 is composed of a screw shaft 25 passing through a hole formed in the upright walls 22, 22 of the base frame 24, and a head 26 formed at the base end of the screw shaft 25. Further, a nut 31 is screwed onto the tip of the threaded shaft 25 of the bolt 27, and this nut 31 prevents the bolt 27 from coming off and preventing unexpected rotation.

The slide block 28 is prevented from rotating by having its bottom surface contact the top surface of the bottom plate of the base frame 24, and is configured to spiral as the bolt 27 rotates and slide on the bottom plate 21. . Further, a projection 30 having a flange portion 29 is formed on the upper surface of the slide block 27, so that the side portion of the hanging link upper member 11 comes into contact with this projection 30 when the ladder device is extended and extended.
As a result, the suspension link 9 is prevented from rotating and maintained in its extended state, thereby supporting the ladder device in its expanded and extended state.

In addition, the lower member 12 of the hanging link 9 and the edge frame 1
A tension coil spring 16 is tensioned between the tension coil spring 1 and the bracket 15 attached to the tension coil spring 1.
6 urges the ladder main body 3 and the canopy 2 upward. The tension of the spring 16 reduces the pushing up force when the ladder main body 3 is stored, and also prevents a sudden extension operation during the unfolding operation. It is desirable that the bracket 15 and the spring 16 be connected via a turnbuckle 17 so that the tension of the spring 16 can be adjusted in accordance with the weights of the ladder body 3 and the canopy 2. In addition, the above bracket 1
A plurality of mounting holes 18 are formed in the mounting hole 1.
8 can be appropriately selected to engage the end hook of the turnbuckle 17, the tension of the spring 16 can be adjusted over a wider range.

In the above configuration, after the ladder device is attached to the edge frame 1, when adjusting the extension angle of the ladder main body 3 according to the distance between the ceiling 6 and the floor surface 8,
With the nut 31 loosened, use an appropriate tool to rotate the bolt head 26 and remove the slide block 28.
to spiral. As a result, slide block 28
The rotation locking position of the hanging link 9 by the projection 30 moves, and the extension angle of the ladder device supported by the hanging link 9 changes. After adjusting the projecting angle, the nut 31 is tightened to prevent the bolt 27 from rotating and rattling.

The bolt head 26 and nut 31 are located outside of the upright walls 22, 22, so that a wide space can be secured for rotational operation. In addition, by simply rotating the bolt head 26, the extension angle of the ladder device can be easily and steplessly adjusted, which is extremely convenient. Furthermore, by tightening the nut 31, the bolt 27 is reliably held on the base frame 24, and even when the suspension link 9 comes into contact with the protrusion 30 of the locking member 20 and an impact load is applied, the bolt 27 can be held securely. The locked state can be firmly maintained. Further, the upright walls 22, 22 of the base frame 24, on which the bolts 27 are supported, are connected to side walls 23.
Since the ladder device is connected and reinforced by the ladder device, it has excellent strength against the above-mentioned impact load, and the ladder device can be stably held in the extended state.

Note that the structure may be such that the side wall 23 is omitted. Furthermore, a retaining pin may be used in place of the nut 31 provided at the tip of the bolt 27. Furthermore, a butterfly-shaped head may be formed at the base end of the screw shaft 25 so that the bolt 27 can be rotated more easily.

As explained above, this invention allows the extension angle of the ladder device to be easily and steplessly adjusted by rotating the screw shaft and threading the slide block, thereby making it possible to easily and steplessly adjust the extension angle of the ladder device. This has the advantage that the spacing and the overall length of the ladder body can be adapted very simply and precisely.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of this invention.
Figure 2 is an enlarged perspective view showing the main parts of this invention;
The figure is a perspective view showing a conventional example. 1... Edge frame, 3... Ladder body, 3a, 3b, 3c
... ladder part, 6 ... ceiling, 8 ... floor surface, 9 ... suspension link, 20 ... locking member, 22 ... standing wall, 24 ... base frame, 25 ... screw shaft, 26 ... head, 27 ... bolt,
28...Slide block, 30...Protrusion.

Claims (1)

[Scope of utility model registration request] A frame attached to an opening in the ceiling, and a plurality of upper and lower tiers that are folded and stored above the opening when not in use, and are unfolded and span between the frame and the floor when in use. A locking member for supporting a ladder device in an expanded and extended state, the ladder device comprising a ladder main body consisting of a ladder portion and supported by the edge frame via a bendable and extensible hanging link in the middle portion,
A base frame including a pair of opposing upright walls, a screw shaft that penetrates through holes formed in both upright walls and is rotatably supported by the base frame, and a screw shaft that is screwed onto the screw shaft. The slide block has a slide block that spirals when the shaft rotates, and the slide block is formed with a protrusion that comes into contact with the hanging link to prevent the ladder from rotating when the ladder main body is extended. A locking member for a ceiling ladder device, characterized in that a rotation operation part is provided.