JPH05489Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an improvement of a locking device that regulates the protruding angle of the ladder body in a ceiling ladder device used for climbing up and down the ceiling. be.

(Prior art) Conventionally, a folding device consisting of a ladder section with multiple upper and lower steps,
Equipped with an expandable ladder main body, each ladder section is unfolded and strung diagonally between the ceiling and floor when in use, and each ladder section is folded and stored in the attic when not in use. A ceiling ladder device is used. This ladder device is supported on the edge frame of a ceiling opening by a hanging link that is configured to be flexible at the middle part, and when in use, the hanging link is brought into contact with a locking member (stopper device). By stopping the ladder body, the extension angle of the ladder body is regulated. For example, Utsukai Showa 55-150137
In the ladder device shown in the publication, the stopper fitting fixed to the edge frame (storage frame) of the ceiling opening is provided with a U-shaped tip at one end, and a locking piece with a threaded portion at the other end. By screwing together and engaging the hanging link with this locking piece, the swing range of the hanging link is restricted and the ladder body is locked at a predetermined extension angle, and the threaded part is screwed together. By rotating the nut, the protruding length of the locking piece is changed and the protruding angle of the ladder body is adjusted.

However, with the above configuration, the extension angle of the ladder body is adjusted by rotating the nut, which is time consuming and difficult to adjust the locking angles of the pair of left and right suspension links to be the same. Further, since the load from the hanging link is supported by the threaded portion, the strength is likely to be insufficient, and the ladder device is likely to wobble. Also, Utsukai Showa 61-59725
The device described in the publication is equipped with a stopper block that can be exchanged from top to bottom, and the angle can be adjusted by replacing the stopper block. However, this device has the following drawbacks. That is, when adjusting the angle, the stopper block must be removed from the opening frame and replaced.

To accommodate multiple angular adjustments, both sides of the stopper block must be used.

Normally, there is a pair of hanging links on the left and right, so if you completely remove the block when adjusting the angle, you will not be able to temporarily place the hanging links, it will be difficult to adjust the left and right balance, and if the adjustment does not go well, has poor workability, such as having to start over from the beginning.

Using the front and back sides of the stopper block is
This confuses the operator when determining the mounting surface, and it is necessary to apply decoration to both sides of the stopper block.

(Purpose of the invention) The present invention was made in order to eliminate the above-mentioned drawbacks, and it is possible to adjust the projecting angle of the ladder body as necessary with a simple operation, and also to adjust the hanging link to a predetermined angle. To provide a locking device for a ceiling ladder device that can be locked stably.

(Structure of the invention) The invention consists of a frame attached to an opening in the ceiling,
a ladder body that is folded and stored above the opening when not in use, and is unfolded and spanned between the edge frame and the floor surface when in use; A locking device for regulating the extension angle of the ladder device supported on the edge frame via a suspension link configured to be freely bendable and extensible, the locking device being a locking device for regulating the extension angle of the ladder device supported by the above-mentioned edge frame via a suspension link configured to be freely bendable and extensible at the A ladder device having an abutting member that abuts against and prevents rotation, the abutting member having a single mounting hole formed therein, the abutting member being inserted into the mounting hole of the abutting member, and the abutting member being inserted into the mounting hole of the abutting member, The contact member has a single support shaft that rotatably supports the contact member, and a fixing member that is screwed onto the support shaft via the contact member to prevent rotation of the contact member. Suspension link contact surfaces having different distances from the mounting hole are formed on the outer periphery of the contact member.

(Example) Fig. 1 shows an overall configuration diagram of a ladder device according to the present invention. The ladder body 4 includes a canopy 3 and a ladder body 4. In this ladder main body 4, upper, middle, lower, and three ladder parts 4a, 4b, and 4c are connected via hinge fittings 5 and 6 so that they can be folded and expanded, and the upper ladder part 4a is connected to mounting brackets 7 and 7. It is fixed to the upper surface of the canopy 3 via. Also, this ladder body 4
When in use, each ladder part 4a, 4b, 4c is unfolded as shown by the solid line and spans between the ceiling 1 and the floor 8, and when not in use, it is folded onto the canopy 3 as shown by the imaginary line. It is configured to be stored above an opening in the ceiling 1 in a closed state.

A hanging link 9 is provided between the edge frame 2 and the canopy 3, and the ladder main body 4 is supported by the edge frame 2 via this hanging link 9. That is, the suspension link 9 consists of an upper member 11 and a lower member 12 which are connected in a bendable and extensible manner by a connecting pin 10 at the middle part, and the upper end part of the upper member 11 is attached to the edge frame 2 by a support pin 11a. hanging bracket 13
The lower end of the lower member 12 is pivotally supported on a support bracket 14 attached to the upper surface of the canopy 3.

When the ladder device is stored, the hanging link 9 is bent as shown by the imaginary line, and the ladder main body 4 is positioned above the opening in the ceiling 1, and when the ladder device is used, the ladder main body 4 cannot be extended. Therefore, after the suspension link 9 extends while rotating around the upper end pivot portion (support pin 11a) of the upper member 11, the rotational displacement of the upper member 11 is prevented by the locking device provided on the suspension bracket 13. 15. Note that a pair of hanging links 9 are provided on either side of the ladder main body 4.

Further, a tension bracket 16 is attached to the edge frame 2, and a tension coil spring 17 is tensioned between the tension bracket 16 and the lower member 12 of the hanging link 9. Therefore, the ladder main body 4 and the canopy 3 are urged upward. The tension of the tension coil spring 17 reduces the pushing up force when the ladder device is stored, and prevents the ladder device from suddenly flying out when it is deployed and extended. Further, in this embodiment, the tension bracket 16 and the tension coil spring 17 are connected via a turnbuckle 18,
By rotating the turnbuckle 18, the tension of the tension coil spring 17 can be adjusted depending on the weight of the ladder device.
Furthermore, by forming a plurality of mounting holes 19 in the tension bracket 16 and selecting the mounting holes 19 to engage the end hooks of the turnbuckles 18, the tension length of the tension coil spring 17 can be adjusted. The tension can be adjusted by changing the strength.

As shown in FIG. 2, the locking device 15 is composed of a contact member 20 made of a polygonal plate, a support shaft 21 made of a square root bolt, and a fixing member 22 made of a nut. . The support shaft 21
Insert the proximal square root part 21a of the suspension bracket 13 into the square hole 13a of the suspension bracket 13, and then insert the distal end threaded part 21b of the support shaft 21.
with the support shaft 2 protruding from the bracket 13.
1 to the hanging bracket 13. Then, the threaded end portion 21b of the support shaft 21 is attached to the abutting member 20.
By inserting the contact member 2 into the mounting hole 20a, the contact member 2 can be rotated about the support shaft 21.
0 and after adjusting the mounting angle, the fixing member 22 is tightened with the spring washer 23 interposed therebetween to fix the contact member 20 to the hanging bracket 13.

The abutment member 20 has a mounting hole 20a serving as its center of rotation, and four abutment surfaces A, B, C, and D that abut against the lower side of the upper member 11 of the suspension link 9. Contact surfaces A, B, C, and D are the mounting holes 20 above.
The distances from a are formed to have different lengths. As shown in FIG. 3 when the ladder device is extended and extended, the lower side of the upper member 11 abuts on any of the abutment surfaces of the abutment member 20, thereby causing the suspension link 9 to is prevented from rotating and its extended state is maintained, and the extension angle of the ladder main body 4 is regulated to a predetermined angle.
It is gaining support in

In the above configuration, after the ladder device is attached to the edge frame 2, when adjusting the extension angle of the ladder main body 3 according to the distance between the ceiling 1 and the floor surface 8,
With the fixing force of the fixing member 22 of the locking device 15 loosened, the abutting member 20 is rotated about the support shaft 21 to abut the abutting surfaces A and B on which the upper member 11 of the hanging link 9 comes into contact. , C, and D, the locking position of the hanging link 9 is adjusted. That is, the third
As shown by the solid line in the figure, the contact surface A with the longest distance from the mounting hole 20a is selected, and as shown in the imaginary line, the contact surface C is selected where the distance is shorter than that of the contact surface A. If we compare the case, this contact surface C
In the case where the upper member 11 is selected, the rotation range of the upper member 11 can be larger, so that the suspension link 9 can be extended to a state closer to a straight line, and the projecting angle of the ladder main body 4 can be increased. In this way, the contact member 2
By selecting one of the contact surfaces A, B, C, and D having different distances from the mounting hole 20a, which is the center of rotation of the The extension angle of the ladder body 4 can be adjusted according to the distance between the ladder body 4 and the floor 8, and the ladder body 4 is held in a state where the lower end of the lower ladder part 4c is in contact with the floor 8. can do.

When fixing the abutting member 20, if the fixing member 22 is tightened with the upper member 11 of the hanging link 9 in contact with a predetermined contact surface and positioned, the hanging link 9 can be fixed. Since the abutting member 20 can be fixed at a position where the upper member 11 and the abutting member 20 make surface contact during locking, the suspension link 9 can be stably locked. In addition, the load from the hanging link 9 acts on the mounting hole 20a of the abutment member 20 as a moment about the support pin 11a of the upper member 11, so the abutment member 20 does not rotate and is attached to the support shaft 21. As a result, the hanging link 9 can be stably and firmly locked. Furthermore, there is an advantage that the left and right suspension links 9 can be easily adjusted to the same angle.

In the above embodiment, a square root bolt is used as the support shaft 21, and by fitting the square root bolt 21a into the square hole 13a of the hanging bracket, the fixing member 22 can be rotated without holding the support shaft 21. Although the extension angle of the ladder main body 4 can be easily adjusted by making the ladder main body 4 movable, ordinary hexagonal bolts may be used instead of the square root bolts. Further, a nut portion is integrally provided on the suspension bracket 13, and the abutment member 20 is fixed by screwing a bolt member to the nut portion, and the support shaft 21 is attached to the bolt member.
The function of the fixing member 22 may also be combined.

Further, as shown in FIG. 4, the link guide 24 may be attached to the upper surface of the upper end pivot portion of the upper member 11 of the hanging link 9 and the abutment member 20 in an overlapping manner. According to this configuration, even if the upper end pivot portion of the upper member 11 is shaken due to long-term use, the side portion of the upper member 11 is guided by the link guide 24 and the abutting member 20
This has the advantage that the locking function of the suspension link 9 can be reliably prevented from being impaired due to the upper member 11 riding on the contact member 16. In addition, in the above embodiment, the polygonal contact member 20
Contact surfaces A, B, C, and D are formed on the outer peripheral surface of the contact member 20', respectively, as shown in FIG.
A plurality of protrusions 25, 26, 27, 28 may be provided on the surface of the upper member 11, and these protrusions 25, 26, 27, 28 may form a contact surface that comes into contact with the upper member 11.

(Effects of the invention) As explained above, the present invention uses a contact member having a plurality of contact surfaces with different distances from the support shaft, which is the center of rotation, to provide a suspension link when the ladder main body is extended. is locked in a predetermined position to prevent its rotation, so that the abutting member can be rotated around the support shaft with the fixing force of the fixing member to the abutting member loosened and attached to the hanging link. By selecting the abutment surface to abut, the locking position of the hanging link can be easily adjusted. Moreover, the load from the hanging link can be firmly supported via the abutting member. Therefore, the projecting angle of the ladder body can be adjusted according to the distance between the ceiling and the bottom surface, and the ladder body can be locked in a state where the lower end of the lower ladder part is in contact with the floor surface. As a result, the extended extended state of the ladder main body can be maintained stably for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a ladder device according to the present invention, FIG. 2 is an exploded perspective view showing an embodiment of the locking device of the ladder device, and FIG. 3 is an explanatory diagram showing the action of this locking device. FIG. 4 is an enlarged perspective view of main parts showing another embodiment of the present invention, and FIG. 5 is a perspective view showing another embodiment of the abutment member. 1...Ceiling, 2...Edge frame, 4...Ladder body,
4a, 4b, 4c...Ladder part, 8...Floor surface, 9
... Hanging link, 15 ... Locking device, 20,2
0'...Abutment member, 21...Support shaft, 22...Fixing member, A, B, C, D...Abutting surface.

Claims (1)

[Scope of utility model registration request] A frame attached to the 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 spanned between the frame and the floor when in use. A locking device for regulating the projecting angle of a ladder device, which comprises a ladder main body consisting of a ladder portion, and is supported by the edge frame via a hanging link configured to be flexible and extendable in the middle portion,
A ladder device having a contact member that abuts against the suspension link to prevent rotation when the ladder main body is extended and extended, wherein the contact member is formed with a single mounting hole, and the contact member is formed with a single mounting hole; A single support shaft that is inserted into the mounting hole of the contact member and rotatably supports the contact member, and a single support shaft that is screwed onto the support shaft through the contact member to allow rotation of the contact member. and a fixing member for preventing the above-mentioned ceiling ladder device, wherein contact surfaces of hanging links having different distances from the mounting hole are formed on the outer periphery of the contact member. Stop device.