JP2011058203A - Connection member of ladder and connection ladder using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection member of a ladder and a connection ladder using the same capable of preventing the occurrence of slippage and bending in a connection part. <P>SOLUTION: This connection member 2 is provided and added on a butting part 1' of a support column 1 having one or a plurality of reinforcing ribs 1c formed along the longitudinal direction and is firmly tightened and connected by a bolt 3 and a nut 4 in a plurality of sections on both sides or in a plurality of sections on one side of the butting part 1'. The connection member 2 includes an engaging part 2c engaging with the reinforcing ribs 1c on the support column 1, restraining travel in the direction crossing the longitudinal direction of the support column orthogonally, and formed on a joint face 2a abutted on the support column 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a connecting material and a connecting ladder for a ladder used in an addition system.

Conventionally, a long ladder is inconvenient for transportation and storage as it is, and a connecting ladder that is foldable, expandable, or used by adding is known.
Many conventional connecting ladders fix a column and a connecting member with bolts and nuts (see, for example, Patent Document 1).

JP-A-8-109784

However, it is necessary to form a clearance for the bolt hole formed in the support column and the connecting material in Patent Document 1 so that the bolt is inserted. When the external force acts on the ladder for this clearance, the entire ladder is There was a problem that a gap or bending occurred at the connecting part.
In addition, the cross section of the pillar of the conventional ladder is I-shaped or U-shaped, and the connecting material is designed to be applied to the flange wall surfaces on both sides of the pillar to reduce the problem due to the clearance of the bolt hole. However, high-precision processing is required. In addition, it is necessary to have a suitable connecting material depending on the shape and size of the support material, and it is necessary to provide a certain degree of tolerance between the flange wall surface on both sides and the connecting material. This is not a fundamental solution to the above problem.

  The present invention has been proposed in view of the above-described disadvantages of a conventional connecting ladder, and provides a connecting material for a ladder capable of preventing the occurrence of displacement and bending in the connecting portion, and a connecting ladder using the connecting material. The purpose is to do.

In order to achieve the above object, the connecting ladder of the present invention is attached to the abutting portion of the support column in which one or a plurality of reinforcing ribs are formed along the longitudinal direction. It is a connecting material that is tightly connected by bolts and nuts at multiple locations on one side,
The connecting member is formed with an engaging portion that engages with a reinforcing rib of the support column and restricts movement in a direction orthogonal to the longitudinal direction of the support column on a joint surface attached to the support column. It is said.

  According to this configuration, the reinforcing rib of the support column and the connecting member are tightened to the reinforcing rib formed along the longitudinal direction of the support member by tightening the bolt and nut in a state where the engaging portion of the connecting member is engaged. Can be firmly coupled, for example, in a biting state or in a close contact state with at least two places (both sides of the engaging portion) in the lateral direction perpendicular to the longitudinal direction of the support column. In addition, the coupling portion in the biting state or in the engagement and close contact state is formed in an amount corresponding to the length of the connecting material in the longitudinal direction of the support column. As a result, according to the configuration of the present invention, even if there is a clearance between the bolt hole and the bolt, the support column and the connecting material can be integrally and firmly connected regardless of the presence of this clearance. Even if an external force acts on the ladder, for example, it is possible to remarkably improve the effect of preventing displacement and bending at the connecting portion. In addition, the reinforcing rib is provided to increase the strength (bending strength) of the column and is an existing one, but this can be effectively utilized to eliminate the conventional problems. As a specific configuration, since it is only necessary to provide an engaging portion that engages with the reinforcing rib on the joint surface of the connecting material, it can be implemented simply and inexpensively.

The connecting member is composed of a set of two plate-like members attached to both sides of the support column, or a single plate-like member attached to one side of the support column. It is desirable.
According to this configuration, by carrying out a set of two connecting members in contact with both sides of the support, it is possible to more reliably prevent the occurrence of the displacement and the bending than in the case of one on one side.
In the connecting material, a plurality of bolt holes penetrating in the thickness direction of the support column are formed in parallel in a plane perpendicular to the longitudinal direction of the support column, and on the outer surface side of the half-hole bolt hole formed in parallel. Alternatively, the bolt head or nut may be provided with a non-rotating recess, and the outer surface of the remaining one-side half of the bolt hole may be a flat seat surface provided with no anti-rotation.

By carrying out in this form, there is an advantage that the tightening / relaxation work of bolts and nuts can be carried out from one side of the support column with only one wrench tool, and one type of connecting material used as a set of two pieces is used. Since it can be processed by a processing mold, the cost can be reduced.
The connecting member is composed of a plate-like member, and both front and back surfaces thereof are contact surfaces to the support columns, and the reinforcing ribs of the two types of support columns having different reinforcing ribs are formed on the contact surfaces of the front and back surfaces. Two types of engaging portions to be engaged may be formed separately for each type, and one type of connecting material may be shared to connect two types of struts by changing the direction of the front and back.

By carrying out in this form, one type of connecting material can be shared for connecting two types of struts, the cost of the connecting material can be reduced, and the number of types of connecting materials relative to the number of types of struts can be halved, Storage and handling can be simplified.
In addition, the connecting ladder according to the present invention includes the connecting material according to any one of the above-described connecting portions of two struts connected by a plurality of steps, and a plurality of both sides or one side of the abutting portion. Tightened with bolts and nuts at multiple locations.

  According to this structure, the connection ladder which can prevent generation | occurrence | production of the shift | offset | difference and bending in a connection part can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the connection material of the ladder which can prevent generation | occurrence | production of the shift | offset | difference and bending in a connection part, and the connection ladder using this connection material can be provided.

It is an expanded sectional view of the connection part of the connection material in the 1st Embodiment of this invention, and a connection ladder. It is a principal part expanded sectional view of the connection part of the connection material of FIG. 1, and a connection ladder. It is a side view of the connection part of the connection material of FIG. 1, and a connection ladder. It is a front view of the connection part of the connection material of FIG. 1, and a connection ladder. It is a side view of the connection part of the connection material in the 2nd Embodiment of this invention, and a connection ladder. It is an expanded sectional view of the connection part of the connection material in the 2nd Embodiment of this invention, and a connection ladder. It is a side view of the connection part of the connection material in the 3rd Embodiment of this invention, and a connection ladder. It is an expanded sectional view of the connection part of the connection material in the 3rd Embodiment of this invention, and a connection ladder. It is a side view of the connection part of the connection material in the 4th Embodiment of this invention, and a connection ladder. It is an expanded sectional view of the connection part of the connection material in the 4th Embodiment of this invention, and a connection ladder. It is a principal part expanded sectional view of the connection part of the connection material in the 4th Embodiment of this invention, and a connection ladder. It is a side view of the connection part of the connection material in the 5th Embodiment of this invention, and a connection ladder. It is an expanded sectional view of the connection part of the connection material in the 5th Embodiment of this invention, and a connection ladder. It is a side view of the connection part of the connection material in the 6th Embodiment of this invention, and a connection ladder. It is an expanded sectional view of the connection part of the connection material in the 6th Embodiment of this invention, and a connection ladder.

Embodiments of a ladder connecting material and a connecting ladder using the connecting material according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 4, the connecting ladder according to the present invention includes support columns 1 and 1 that are end-to-end, and a connecting member 2 that is in contact with an abutting portion 1 ′ of these support columns 1 and 1. And the bolt 3 and the nut 4 which tighten and connect this connecting material 2 and the support | pillars 1 and 1 in multiple places on both sides of the butting | matching part 1 'are made into the main members.

Two columns of a predetermined length form a pair and are connected to a plurality of stages by a cross rail 5 between them to form a ladder. The support column 1 is formed in an I-shaped cross section by a main beam portion 1a and flange portions 1b and 1b formed in series orthogonal to both ends of the main beam portion 1a. In addition, although the case where the material of the support | pillar 1 is made from aluminum alloy is illustrated, it is not restricted to this.
The flange portions 1b and 1b are asymmetric in the protruding length and shape of the ladder in the left-right direction with respect to the main girder portion 1a, and the shorter protruding length is arranged on the outer side in the left-right direction of the ladder. The longer one is used inside the ladder in the left-right direction. The longer end portions of the flange portions 1b and 1b on both sides are bent inward at a right angle. In addition, the cross-sectional shape of the support | pillar 1 is not restrict | limited to the example of illustration.

An end portion of the traverse 5 is inserted and fixed to the main beam 1a. The crosspiece 5 is flat with the upper surface as a tread surface 5a, and the entire cross-sectional shape is a bowl-shaped hollow cylinder. The step rail 5 is exemplified by an aluminum alloy, but is not limited thereto.
Further, a plurality of reinforcing ribs 1 c are formed in the main girder 1 a so as to protrude along the longitudinal direction of the support column 1. The reinforcing rib 1c is formed in the same manner on both surfaces of the main beam portion 1a. Moreover, the case where the cross-sectional shape of this reinforcement rib 1c is made into the semicircle is illustrated. The formation position and shape of the reinforcing rib 1c are appropriate and are not limited to the illustrated example.

A plurality of bolt holes 1 d are formed at the end of the support column 1. The bolt hole 1d is formed through the main beam 1a. The installation position and the number of the bolt holes 1d are illustrated as an example in which two columns are arranged in two rows in the longitudinal direction of the support column 1, but are not limited thereto.
The connecting member 2 has a width that is the same as or slightly smaller than that of the main girder portion 1a, and the length of the connecting member 2 can abut (attach) to the abutting portion 1 'between the end portions of the support columns 1 and 1 in an attached plate shape. A rectangular plate-like member having a length that can be formed. Although this connection material 2 has illustrated the case where it forms with an aluminum alloy, it is not restrict | limited to this.

  In the connecting member 2, one surface (inner surface) of the plate-like member is a joining surface 2a that comes into contact with the main girder 1a, and the seat surface 2b of the bolt 3 or the nut 4 is formed on the other surface (outer surface). Yes. An engaging portion 2 c that engages with the reinforcing rib 1 c of the support column 1 and restricts the movement in the direction orthogonal to the longitudinal direction of the support column 1 is formed as a concave groove on the joint surface 2 a of the connecting member 2. The engaging portion 2c has a concave groove shape that engages across the reinforcing rib 1c of the support column 1. In this embodiment, the engaging portion 2c has a tapered shape that widens from the groove bottom to the groove upper surface. In addition, the shape of the engaging part 2c is not restrict | limited to the example of illustration, For example, an appropriate groove shape can be employ | adopted according to the shape of a cross-sectional rectangle, a cross-sectional semicircle, and the reinforcement rib 1c.

  The connecting material 2 is formed with the same number and the same number of bolt holes 2 d corresponding to the bolt holes 1 d of the support column 1. This connecting material 2 is used as a set of two sheets, abutted (attached) to the abutting portion between the ends of the support columns 1 and 1 from both sides of the main beam portions 1a and 1a. Note that the connecting member 2 can be used alone by being attached from one side of the butted portion 1 ′ between the ends of the columns 1, 1.

  Since the first embodiment of the connecting member 2 and the connecting ladder according to the present invention has the above-described configuration, the engaging member 2 is engaged with the reinforcing rib 1c formed to protrude along the longitudinal direction of the support columns 1 and 1. With the portion 2 c engaged, the bolt 3 is inserted into the bolt hole 1 d of the support pillars 1, 1 and the bolt hole 2 d of the connecting member 2, and the nut 4 is screwed into the insertion end of the bolt 3, so that the bolt 3 and the nut 4 are inserted. The reinforcing ribs 1c of the support columns 1 and 1 and the engaging portions 2c of the connecting member 2 are connected to at least two lateral directions perpendicular to the longitudinal direction of the support columns 1 and 1 (both sides of the engaging portions 2c). ) Can be firmly coupled in a biting state or in an engagement and close contact state. In addition, the coupling portion in the biting state or the engagement and close contact state is formed in the longitudinal direction of the support columns 1 and 1 by an amount corresponding to the length of the connecting member 2. As a result, even if there is a clearance between the bolt holes 1d, 2d and the bolt 3, the struts 1, 1 and the connecting member 2 can be firmly and integrally connected regardless of the presence of the clearance, For example, even if an external force is applied to the ladder, it is possible to remarkably improve the action of preventing the displacement and the bending at the connecting portion.

  5 and 6 show a second embodiment of a connecting member and a connecting ladder according to the present invention, and the connecting member 2 in this embodiment has a bolt hole 2d penetrating in the thickness direction of the column 1. A plurality (two) of the pillars 1 are formed in parallel in a plane orthogonal to the longitudinal direction, and the heads of the bolts 3 or the nuts 4 are arranged on the outer surface side of the bolt holes 2d on one side half formed in parallel. It differs from the first embodiment in that a stop recess 2e is provided and a flat seat surface 2b is provided on the outer surface side of the remaining one half bolt hole 2d. The configuration of is the same as that of the first embodiment. The anti-rotation recess 2e is formed in a groove shape over the entire length of the connecting member 2 in the longitudinal direction. This groove width is made equal to the opposite dimensions of the hexagonal opposite sides of the head of the bolt 3 or the nut 4, whereby the head of the bolt 3 or the nut 4 fitted into the rotation stopper recess 2 e is , It will be stopped. In this second embodiment, only one type of connecting material 2 is used in a set of two sheets, and the connecting material 2 can be used by being inverted upside down on both the inside and outside of the column 1 as shown in FIG. be able to. As a result, it is possible to use a common processing die for the connecting material 2. However, it is necessary to perform tightening / relaxation work of the bolt 3 and the nut 4 from the opposite sides of the rotation stopper recess 2e.

  7 and 8 show a third embodiment of the connecting member and connecting ladder according to the present invention. In this embodiment, the bolt 3 of the connecting member 2 or the non-rotating recess 2e of the nut 4 is removed. The only difference from the second embodiment is that the retaining rib portion 2f is provided on the inlet side, and the other configuration is the same as that of the second embodiment. The anti-rotation recess 2e and the retaining hook 2f in the third embodiment are formed in a groove shape over the entire length in the longitudinal direction of the connecting member 2, and the nut 4 is connected to the connecting member 2 in the anti-rotation recess 2e. It inserts from the longitudinal direction edge part. In this 3rd Embodiment, it is limited to using by inserting the nut 4 in the rotation stop recessed part 2e. Accordingly, the bolt 3 is turned with a wrench tool or the like to perform tightening / relaxation work. In any case, in the second and third embodiments, there is an advantage that the tightening / relaxation work of the bolt 3 and the nut 4 can be performed from one side of the support column 1 with only one wrench tool, and two sheets Since the connecting material 2 used in one set can be processed by one type of processing mold, the cost can be reduced.

  9 to 11 show a fourth embodiment of the present invention. The reinforcing rib 1c formed on the support column 1 is only different in position and sectional shape from the first embodiment. The other configuration is the same as that of the first embodiment. In the fourth embodiment, four reinforcing ribs 1c are formed at equal intervals in the lateral width direction of the main girder portion of the support column 1, and the cross-sectional shape thereof is rectangular, corresponding to this, The position of the engaging portion 2c formed on the joint surface 2a is set.

  12 to 15 show the fifth and sixth embodiments of the present invention. The connecting member 2 in this embodiment is formed of a flat plate-like member, and both the front and back surfaces of the connecting member 2 contact the support column 1. The contact surfaces 2a1 and 2a2 are two contact types that engage with the reinforcing ribs 1c1 and 1c2 of the two types of support columns 1A and 1B having different reinforcing ribs 1c. The joint portions 2c1 and 2c2 are formed separately for each type, and one type of connecting material 2 can be shared for connecting two types of support columns 1A and 1B by changing the front and back directions. Specifically, FIGS. 12 and 13 are applied to the support column 1 of the first embodiment shown in FIGS. 1 to 4, and FIGS. 14 and 15 are shown in FIGS. 9 to 11. This is applied to the support column 1 of the fourth embodiment.

By carrying out in the fifth and sixth embodiments, one type of connecting material 2 can be shared for connecting two types of supporting columns 1A and 1B, and the cost of the connecting material 2 can be reduced. The number of types of the connecting material 2 relative to the number of types can be halved, and storage and handling can be simplified.
Although the embodiments of the present invention are configured as described above, the present invention is not limited to these embodiments, and can be freely modified and implemented. For example, the cross section of the column 1 can be applied to I-type, U-type, and others, and the material is not limited to aluminum alloy, and other metals, FRP, and others can be applied. Further, the reinforcing rib 1c may be one or plural. In addition, the arrangement and the cross-sectional shape of the reinforcing rib 1c can be freely changed, and the arrangement and the groove shape of the engaging portion 2c of the connecting member 2 can be appropriately changed accordingly. In addition, the uneven | corrugated relationship between the reinforcement rib 1c and the engaging part 2c is applicable also in the reverse case.

  The present invention is not limited to being portable, and can also be used for a connecting ladder that is fixedly installed.

1, 1A, 1B Post 1 'Butting part 1a Main girder part 1b Flange part 1c, 1c1, 1c2 Reinforcement rib 1d Bolt hole 2 Connecting material 2a, 2a1, 2a2 Joint surface 2b Seat surface 2c, 2c1, 2c2 Engagement part 2d bolt Hole 3 bolt 4 nut 5

Claims (5)

A connecting material that is attached to the abutting portion of the column in which one or more reinforcing ribs are formed along the longitudinal direction, and is tightened and connected by bolts and nuts at both sides or at one side of the abutting portion. Because
The connecting member is formed with an engaging portion that engages with a reinforcing rib of the support column and restricts movement in a direction orthogonal to the longitudinal direction of the support column on a joint surface attached to the support column. Ladder connecting material.   The connecting member is composed of a set of two plate-like members attached to both sides of the support column, or a single plate-like member attached to one side of the support column. The ladder connecting material according to claim 1, wherein:   In the connecting material, a plurality of bolt holes penetrating in the thickness direction of the support column are formed in parallel in a plane perpendicular to the longitudinal direction of the support column, and on the outer surface side of the half-hole bolt hole formed in parallel. The bolt head or nut is provided with a non-rotating recess, and the outer surface of the remaining one half of the bolt hole is a flat seat without a detent. Item 3. The ladder connecting material according to Item 2.   The connecting member is composed of a plate-like member, and both front and back surfaces thereof are contact surfaces to the support columns, and the reinforcing ribs of the two types of support columns having different reinforcing ribs are formed on the contact surfaces of the front and back surfaces. The two types of engaging portions to be engaged are formed separately for each type, and one type of connecting material can be shared for connecting two types of struts by changing the direction of the front and back. Or the connection material of the ladder of Claim 2.   The connecting material according to any one of claims 1 to 4 is attached to a butting portion of two struts coupled by a plurality of steps, and the both sides of the butting portion or a plurality of locations on one side A connecting ladder characterized by being tightly connected by bolts and nuts.

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