JPH0645040Y2 - Ladder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a ladder used in a general home or a construction site.

[Conventional technology]

As is well known, a ladder has a plurality of treads spanned between two girders, but in the conventional ladder, the girders are linear and integrated, and the length thereof is limited to a predetermined length.

For this reason it can only be used for climbing high places,
Its use is limited, and since it climbs straight to a high place, the conditions and height of the place where the ladder can be used are also limited, and because it is a very long long object, storage and transportation are inconvenient. However, it was not easy to use and could not be fully utilized.

On the other hand, although it is different from the ladder, there is a so-called stepladder which is a folded ladder. The height can be adjusted to some extent by adjusting the bending angle, but since the adjustment is based on the angle, the range in which the height can be changed is small. It is also possible to extend the stepladder linearly and use it like one ladder, but in this case as well, since the usable length is limited to a predetermined length, it is difficult to use like the ladder. It was not possible to utilize it.

Therefore, the applicant previously filed Japanese Utility Model Application No. Sho 62-168020 to eliminate the above-mentioned inconvenience and make a desired length, and further bend the middle part at an angle of an acute angle or an obtuse angle at a desired position. Proposed a ladder that can.

This ladder is one in which three holes with a coupling angle of 180 degrees, an acute angle, and an obtuse angle are provided at one end of a plurality of ladder members constituting the ladder, and an insertion guide is provided, and a coupling pin is provided at the other end. Insert one end of the ladder into the other end of the other ladder at an angle of 180 degrees, either acute or obtuse, and project the connecting pin at that position by lever operation. The two ladder members are joined together at a predetermined angle.

[Problems to be solved by the device]

In such a conventional coupling structure, since the coupling pin is used as the coupling means, a lever, a spring, a wire or the like is required as a member for operating the protruding / retracting of the coupling pin,
The number of parts increases and the structure becomes complicated.

In addition, since the connecting pins and levers are in a state of protruding from the ladder member, there is a possibility that other objects may be caught by these connecting pins and levers during the work, which lowers the work efficiency.

Further, the lever operation for projecting the connecting pin is a work at a position apart from the connecting pin and the hole after the connecting pin is aligned with the hole. The workability was not good in some cases because it was damaged.

The object of the present invention is to eliminate the disadvantages of the conventional example, reduce the number of parts in a ladder that connects a plurality of ladder members, simplify the structure, and perform positioning easily and reliably during connection to improve work efficiency. It is to provide a ladder that can.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a ladder formed by connecting a plurality of ladder members, one end of each ladder member having three holes having a coupling angle of 180 degrees, an acute angle, and an obtuse angle, and an insertion guide. Is provided, a coupling hole and a non-slip buffer member at the time of coupling are provided at the other end, and any one of the three holes is aligned with the coupling hole, and the ladder member is coupled by the coupling metal fitting through both holes. It is what

[Action]

According to the present invention, when one end of the ladder member is inserted into the other end of the other ladder member at a desired coupling angle until the anti-slip and cushioning member at the tip comes into contact with the other ladder member, the tip slides at this position. The stop-and-cushion member prevents movement of the ladder material and at the same time the hole fits into one of the three holes. Therefore, in this state, if a fitting such as a bolt is inserted through both holes, both ladder members are joined at a predetermined angle.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical cross-sectional side view showing an embodiment of a ladder material constituting a ladder of the present invention, and FIG. 2 is a plan view of the same as above. 1a in the figure shows a ladder material constituting a ladder, and the ladder material 1a is made of aluminum. With the extruded profile, the pipe-shaped footboards 3 were provided at intervals of approximately 35 cm between the two parallel girders 2, 110 cm in length, so that the girders 2, 2 were formed in a channel shape and opened The faces are back to back, and the tip joint fittings 4 and 4 are attached to one end (right side in the illustrated example) of the beam members 2 and the other end (left side in the illustrated example).
The rear end joint fittings 5 and 5 were fixed to each other using fasteners such as rivets 6.

As shown in FIGS. 3 to 6, the tip joint fitting 4 has a substantially rectangular tubular shape with tapered top surfaces 7a, 7b, 7c on the upper surface and the inner and outer surfaces of the tip portion. A recess 8 is formed in the lower half of the surface, and a slip prevention / buffer member 9 made of rubber or the like is mounted in the recess 8. The thickness of the anti-slip / buffer member 9 is formed slightly larger than the depth of the recess 8 so that the tip surface of the anti-slip / buffer member 9 projects slightly ahead of the tip surface of the tip joint fitting 4. Keep it.

Then, a large rectangular opening 10 for joining work and a circular hole 11 for joining work are also provided in the inner side plate 4a of the tip joint fitting 4, and the base end portion of the tip joint fitting 4 is
The inner plate 4a is cut off, and the top plate and the bottom plate are respectively bent inward to form step differences 4b.
Is the attachment part to the beam member 2.

At the tip of the tip joint fitting 4, a nut 12 serving as a coupling hole is fixed to the inner center of the outer side surface by welding or the like. In addition, a hole for coupling is also provided at a position corresponding to the hole of the fixed nut 12 at the tip of the tip joint member 4.
12a shall be provided.

The rear end joint fitting 5 is formed in a channel shape as shown in FIGS. 7 to 9, and has a hole for connection on the outer side surface.
Three pieces of 13a, 13b, 13c were provided, and an opening 14 for inserting another ladder material was formed in the bottom. The holes 13a, 13b, 13c are formed at positions where the hole 13a has a coupling angle of 180 degrees with other ladder members, and the hole 13b is
Position where the bond angle is acute (55 degrees in the illustrated example), hole 13
Let c be the position where the bond angle is an obtuse angle (125 degrees in the illustrated example). The obtuse angle and the acute angle are the insertion angles that are equally divided into the left and right with the center in the longitudinal direction of the opening 14 as the center line, so the opening dimensions of the opening 14 are the same, only the holes used are different when inserting from either side. Since it is good, there is no backlash after setting. In addition, with the rear end joint fitting 5,
A large rectangular opening 10a for coupling work is provided on the side opposite to the side where the holes 13a, 13b, 13c are provided.

Guide protrusions 15a, 15b are provided so as to spread outwardly as guides for inserting other ladder members at the widthwise position of the opening edge of the opening 14, and the other ladder members are connected at a coupling angle of 180 degrees. A non-slip and cushioning member 9 was attached between the outside of the guide protrusion 15a on the side to be inserted and the rear end joint fitting 5 main body. The anti-slip and cushioning member 9 has a size such that the end portion thereof projects outward from the end surface of the rear end joint fitting 5. In addition, in the illustrated example, the angle between the guide projections 15a and 15b and the rear end joint fitting 5 is 55 degrees so that the spread angle to the guide projections 15a and 15b is equal to the above-mentioned coupling angle between the ladder members. Is formed so that

Further, a hole 16 is formed on the outer surface of the rear end joint fitting 5 near the end on the side opposite to the side where the girder 2 is attached, for connecting a fall-prevention leg fitting to be described later.

FIG. 10 shows a bolt for connecting the front end joint fitting 4 and the rear end joint fitting 5 when connecting the ladder members to each other.
Shows 17.

11 to 13 show the fall prevention leg fittings 18 attached to the grounding surface of the ladder, and as shown in the plan view of FIG.
19a, 19b are juxtaposed in parallel to form a leg fitting body 18a, and extension legs 20a, 20b of the same square tube are slidably housed in the respective square tubes 19a, 19b, near the upper ends of the leg fitting body 18a. The ribs 21a, 21b for attaching to the front end joint fitting 4 or the rear end joint fitting 5 attached to the girder material 2 are attached by a hinge 22 so that the ribs 21a, 21b can be raised and lowered. Drilled.

It should be noted that one of the mounting ribs 21a and 21b is attached to the hinge 2 via a receiving metal fitting 24 having an L-shaped cross section.
2 is slidably mounted on the upper surface of the leg metal fitting body 18a, and the width between the mounting ribs 21a and 21b can be adjusted.

In addition, the pull-out handle 25 is attached to the ends of the extension legs 20a and 20b, and the bottom is made of a non-slip member made of rubber or the like.
Install 26.

The other ladder members 1b, 1c ... 1n are constructed in the same manner as the ladder member 1a, and the tip joint fitting 4 attached to the tips of the ladder members 1a to 1n _-1 as shown in FIG. Insert it into the rear end joint fitting 5 attached to the rear end of 1b to 1n,
By matching the holes 12a provided at the positions corresponding to the holes of the nut 12 with the holes 13a and inserting the bolts 17 into both holes, the front end joint fitting 4 is tightened and fixed to the rear end joint fitting 5, and the ladder member 1a to 1n are sequentially connected to form one long ladder.

Next, the usage and operation will be described. First, when used as a single linear ladder as shown in FIG. 14, a plurality of (4 in the illustrated example) ladder members 1a, 1b, 1c are used. , 1d
To prepare. Then, as shown in FIG. 15, to join the leading end of one ladder member 1a and the trailing end of the other ladder member 1b,
Insert the tip joint fitting 4 fixed to the tip of the ladder material 1a with rivets 6 into the open end of the rear joint fitting 5 also fixed to the rear end of the other ladder material 1b with rivets 6 from the tip. Insert the anti-slip and cushioning member 9 until it comes into contact with the end of the girder member 2 of the ladder member 1b.

At this time, the tip of the tip joint fitting 4 has a tapered portion 7
Since they are formed in a, 7b, and 7c, when inserting the rear end joint fitting 5 into the opening, the tip of the joint fitting 4 does not catch on the opening edge, and the insertion can be performed smoothly. Further, the anti-slip and cushioning member 9 attached to the tip of the tip joint fitting 4 absorbs the force when the tip comes into contact with the girder member 2 of the joint fitting 4.

In this way, if the tip joint fitting 4 is inserted into the rear end joint fitting 5 up to the point where the tip comes into contact with the girder material 2, the hole 11 formed in the tip joint fitting 4 in this state. Fits into the hole 13a formed in the rear end joint fitting 5, so the bolt 17 is inserted into both holes 12a and 13a and the front end joint fitting 4 is fastened to the rear end joint fitting 5 with the bolt 17. Fix the ladder material 1a to the ladder material 1b
To connect.

The other ladder members 1c and 1d are also sequentially connected in the same manner as described above to form one long ladder.

During use, either the front end joint fitting 4 or the rear end joint fitting 5 will be grounded, but since the end portions of both fittings 4 and 5 are equipped with anti-slip and cushioning members 9, respectively. , There is no risk of slipping when leaning against a ladder. For further safety, fall prevention leg fittings 18 are attached to the ends of the ladder as necessary. In this mounting method, first, mounting ribs 21a and 21b mounted on the upper surface of the leg metal fitting body 18a by hinges 22 are vertically erected, and one end of the ladder is positioned on the metal fitting body 18a.

Next, as shown in FIGS. 16 and 17, the holes 11 formed in the front end joint fitting 4 or the rear end joint fitting 5 are formed.
Alternatively, the hole 16 is made to coincide with the coupling hole 23 formed in the mounting ribs 21a, 21b, and the bolt 17 is inserted into the hole 11 or the hole 16 and the coupling hole 23 so that the front end joint member 4 or the rear end joint is formed. The metal fitting 5 is fixed to the mounting ribs 21a and 21b. This bolt 17 can be the same as that used when connecting the front end joint fitting 4 and the rear end joint fitting 5.

Also, if the width between the girders 2, 2 is slightly different depending on the ladder material, by sliding one mounting rib 21a through the hinge 22 and the receiving metal fitting 24, the width between the mounting ribs 21a, 21b can be reduced. Can be adjusted.

Next, hold the handle 25 and attach the extension legs 20a and 20b to the square tube 19 respectively.
The desired length is pulled out horizontally from the inside of a, 19b, and the entire length of the leg is appropriately extended. At this time, since the anti-slip member 26 provided at the bottom of the tips of the extension legs 20a and 20b is in the grounding state, even if a person climbs on the ladder and a load from above is applied to the fall prevention leg fittings 18, There is no risk of the leg fittings 18 slipping. In addition, the anti-slip member 26 allows the extension legs 20a, 20a
Further extension or contraction of b is prevented, so the ladder can be stood in a stable state.

Next, the case of using it as a stepladder will be described. 18 and 19
As shown in the figure, the ladder members 1a, 1b and the ladder members 1c, 1d are connected in a straight line as in the case of forming the ladder. As shown in FIG. 19, the ladder member 1b and the ladder member 1c are connected to each other by connecting the tip joint metal fitting 4 attached to the tip of the ladder material 1b to the rear end joint metal fitting 5 attached to the rear end of the ladder material 1c. Ladder material 1 along the guide protrusion 15b protruding from the
Insert diagonally from the opening 14 with respect to c, and insert the hole 11 provided in the front end joint fitting 4 into the hole of the rear end joint fitting 5.
Match 13b.

Also at this time, the tip of the tip joint fitting 4 has a taper portion 7
Since it is formed in a, 7b, 7c, it can be inserted into the opening 14 smoothly, and the non-slip and buffer member 9 at the tip is the ladder member 1c.
If the hole 11 and the hole 13b are automatically positioned by inserting the metal fitting 5 until it comes into contact with the metal fitting 5, the contact between the tip joint metal fitting 4 and the metal fitting 5 is made by the non-slip and cushioning member 9 at the time of contact. The force generated in the contact is absorbed and the contact position is prevented from being displaced after the contact.

Therefore, if the bolts 17 are inserted into the holes 11 and 13b and tightened in this state, the joint fittings 4,5 are fixed and fixed, and the ladder members 1b and 1c.
And are connected. In this case, since the projecting angle of the guide protrusion 15b is formed to be equal to the connecting angle of the ladder member 1c to the ladder member 1b, the tip joint fitting 4 at the tip of the ladder member 1b is aligned with the guide protrusion 15b. By simply sliding it into the rear end joint fitting 5, a predetermined coupling angle can be obtained.

In this way, the ladder members 1b and 1c are connected with each other at a predetermined coupling angle, for example, 55 degrees, and the fall prevention leg fittings 18 are attached to the ends of the ladder members 1a and 1d at both ends to form a stepladder.

The height of the stepladder is adjusted by sequentially connecting another ladder member to the ladder members 1a and 1d at both ends in a straight line.

Next, when using it as a tower-like stepladder with a horizontal part in the middle, as shown in Figs. 20 and 21, for example, the legs of the six ladder members 1a, 1b, 1c, 1d, 1e, 1f Ladder material 1a that constitutes the part,
1b and the ladder members 1e and 1f and the ladder members 1c and 1e forming the horizontal portion are linearly connected in the same manner as when forming a ladder.

To connect the ladder members 1b and 1c forming the corners, the tip joint metal fitting 4 attached to the tip of the ladder material 1c is projected on the rear end joint metal fitting 5 attached to the rear end of the ladder material 1c. A hole 11 is formed in the tip joint fitting 4 by inserting it obliquely into the ladder member 1c from the opening 14 along a certain guide protrusion 15a.
Are fitted to the holes 13c of the rear end fitting 5.

Also at this time, the tip of the tip joint fitting 4 has a taper portion 7
Since it is formed in a, 7b, 7c, it can be inserted into the opening 14 smoothly, and the non-slip and buffer member 9 at the tip is the ladder member 1c.
The hole 11 and the hole 13c are automatically positioned by inserting the girder member 2 until it comes into contact with the girder member 2. Further, the abutment between the tip joint fitting 4 and the girder member 2 is prevented by the non-slip and cushioning member 9. The force generated at the time of contact is absorbed and the contact position is prevented from shifting after the contact.

Therefore, in this state, if the bolts 17 are inserted into the holes 11 and 13c and tightened, the joint fittings 4,5 are fixed and fixed, and the ladder members 1b and 1c.
And are connected. In this case, since the projecting angle of the guide projection 15a is formed equal to the coupling angle of the ladder material 1c to the ladder material 1b, the tip joint fitting 4 at the tip of the ladder material 1b is aligned with the guide projection 15a. By simply sliding it into the rear end joint fitting 5, a predetermined coupling angle can be obtained.

In this way, the ladder members 1b and 1c are connected with each other at a predetermined coupling angle, for example, 125 degrees, and the fall prevention leg fittings 18 are attached to the ends of the ladder members 1a and 1f at both ends to form a tower-like stepladder with a horizontal portion.

The ladder members 1d and 1e forming the other corners are also connected in the same manner as described above, and thus the ladder members 1b and 1c and the ladder members 1d and 1e are connected with a predetermined coupling angle, for example, 125 degrees.

In order to adjust the height of the stepladder and the length of the horizontal portion, different ladder members may be sequentially connected.

[Effect of device]

As described above, in the ladder of the present invention, when connecting the ladder members, joint metal fittings are provided at both ends of the ladder material and both joint metal fittings are connected by bolts. Alignment and joining work can be performed easily, and since a slip prevention and cushioning member is provided, it is possible to absorb positional deviation and impact force during joining, and workability is good.

In addition, since the ladder member has no protrusions to the side or the like, it does not become bulky during transportation and storage, and it is easy to stack and requires little storage space.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a ladder material constituting a ladder of the present invention, FIG. 2 is a plan view of the same as above, FIG. 3 is a side view of a tip joint fitting, and FIG. 4 is a plan view of the same. Fig. 5 is a front view of the same as above, Fig. 6 is an end view from the rear side showing the connection between the tip joint fitting and the girder material, Fig. 7 is a side view of the rear end joint fitting, and Fig. 8 is a rear view of the same. , FIG. 9 is a front view showing a state where the rear end joint fitting and the girder member are connected, FIG. 10 is a front view of a connecting bolt, FIG. 11 is a front view of a fall prevention leg fitting, and FIG. Is a plan view showing a state in which the telescopic legs are pulled out from the rectangular tube, FIG. 13 is a vertical sectional side view of the same as above, FIG. 14 is a perspective view of a ladder, and FIG. 15 is a front view of a connecting portion which is the same as above.
Figure is a vertical cross-sectional side view showing the connection between the fall-prevention leg fittings and the tip joint fitting. Figure 17 is a vertical cross-sectional side view showing the connection between the fall-prevention foot fittings and the rear end joint fittings. Is a front view when it is used as a stepladder, FIG. 19 is a front view of a connecting part which is the same as above, FIG. 20 is a perspective view when it is used as a tower-like stepladder, and FIG. 21 is the same as above. It is a front view of a connection part. 1a, 1b, 1c, 1d, 1e, 1f… 1n …… Ladder material 2 …… Girder material 3 …… Tread plate 4 …… Tip joint fitting 4a …… Inner plate, 4b …… Step difference 5 …… Rear end Joint fitting 6 …… Rivets 7a, 7b, 7c …… Tapered portion 8 …… Recessed portion 9 …… Slip-proof and cushioning member 10,10a …… Opening, 11 …… Hole 12 …… Nut, 12a …… Hole 13a, 13b, 13c …… hole 14 …… opening, 15a, 15b …… guide protrusion 16 …… hole, 17 …… bolt 18 …… fall prevention leg fitting, 18a …… leg fitting body 19a, 19b …… square tube , 20a, 20b …… Extension legs 21a, 21b …… Mounting rib, 22 …… Hinge 23 …… Coupling hole, 24 …… Receiving metal fitting 25 …… Handle, 26 …… Anti-slip member

Claims (1)

[Scope of utility model registration request] 1. A ladder constituted by connecting a plurality of ladder members, wherein one end of each ladder member has a coupling angle of 180 degrees, an acute angle,
Three obtuse-angled holes and an insertion guide are provided, and the other end is provided with a hole and a non-slip and cushioning member at the time of connection.
A ladder characterized in that any one of the two holes is matched with the hole and the ladder member is connected through the both holes by a coupling metal fitting.