Ladder fixture

Abstract

To provide a ladder fixture capable of independently suppressing misalignment of an upper end side and a lower end side and safely using a moving ladder.SOLUTION: A ladder fixture 1 comprises: a side restraining part 10 that is disposed to face a side surface of a moving ladder 2 and that restrains movement of the moving ladder 2 to a lateral side; and a front restraining part 11 that is disposed to face a front surface of the moving ladder 2 and that restrains movement of the moving ladder 2 to a front side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to ladder fastenings. [Background technology]

[0002] A movable ladder is used for climbing up and down while leaning it against a wall, etc. For safe use, such a portable ladder needs to stay in place from the leaning position. For example, Patent Document 1 describes fixing the top end. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-207204 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to use a portable ladder more safely, it is necessary to prevent the ladder from shifting at both the top and bottom ends. For this reason, in the past, even if the top end was fixed with a fixing bracket, the bottom end was secured with a rope or the like to prevent it from shifting.

[0005] However, the reliability of rope lashing can vary greatly depending on the skill of the worker. Also, if there is no structure to which the rope can be attached at the bottom of the portable ladder, lashing it down becomes difficult, and an assistant to support the ladder is required.

[0006] The present disclosure has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a ladder fixing bracket that can independently suppress misalignment of the upper and lower ends, allowing the portable ladder to be used safely. [Means for solving the problem]

[0007] A ladder fixing bracket according to one aspect of the present disclosure comprises a side restraint portion that is arranged opposite the side of the portable ladder and prevents the portable ladder from moving sideways, and a front restraint portion that is arranged opposite the front of the portable ladder and prevents the portable ladder from moving forward. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 10 is a diagram showing a schematic configuration example of a ladder fixing bracket according to an embodiment. [Figure 2] FIG. 10 is a diagram showing a schematic view of the attachment of the spring hinge to the movable member and the retaining hardware. [Figure 3] A diagram showing the structure of the clamping hardware [Figure 4] Schematic diagram showing the operation of the fixing bracket [Figure 5] Diagram 1 explaining the operation of the portable ladder when leaning it against something [Figure 6] Diagram 2 explaining the operation of the portable ladder when leaning it against something [Figure 7] 1 is a diagram schematically illustrating an example of the configuration and installation mode of a restricting member; [Figure 8] Schematic diagram showing another example of the configuration of the fixing bracket DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following description, the direction toward the bottom in the plan view of Figure 1 will be referred to as the forward direction, the direction toward the top in the plan view as the rearward direction, the direction toward the right in the plan view as the rightward direction, and the direction toward the left in the plan view as the leftward direction, and the direction toward the top in the front view of Figure 1 will be referred to as the upward direction, and the direction toward the bottom in the plan view as the downward direction.

[0010] As shown in Figure 1, ladder fixing bracket 1 (hereinafter simply referred to as fixing bracket 1) is used to fix movable ladder 2 (see Figure 5), and includes a fixing member 3 for fixing to a wall surface or a single-tube pipe, a pair of left and right protrusions 4 provided on the front surface of fixed member 3, a movable member 5 that can be moved back and forth by movable ladder 2, a movable spring 6 connecting movable member 5 and fixed member 3, spring hinges 7 attached to the left and right ends of movable member 5, respectively, and retaining hardware 8 attached to the other end of spring hinge 7, respectively. Note that the material of each component is not particularly limited, but the movable member 5 and retaining hardware 8 can be made lighter by using, for example, aluminum or stainless steel.

[0011] The fixing member 3 is formed in a generally flat plate shape with multiple mounting holes 3a formed at predetermined positions. These mounting holes 3a correspond to mounting structures for fixing the fixing bracket 1 to a wall surface with bolts or to a single-tube pipe with a single-tube clamp. The protrusion 4 is formed in the shape of a hollow square pipe in plan view, and protrudes a predetermined distance from the front surface of the fixing member 3. Note that the square pipe shape of the protrusion 4 is intended to reduce weight, but the square pipe shape is not essential. The protrusion 4 can also have other shapes, such as a hemispherical, pyramidal, or curved shape in plan view.

[0012] The movable spring 6 biases the movable member 5 forward, and a support member 9 that supports the movable member 5 so that it can move back and forth passes through the center of the movable spring 6. This support member 9 is formed in the shape of a bolt having a relatively small diameter body portion 9a and a relatively large diameter head portion 9b, as shown in FIG. 4, which will be described later, and is fixed to the fixed member 3 by passing the small diameter portion through a through-hole provided in the movable member 5, with the head portion 9b facing the front surface of the movable member 5.

[0013] The movable member 5 is formed in the shape of a relatively narrow flat plate, and is provided at the upper end side of the fixed bracket 1. The movable member 5 is movable back and forth along the support member 9, and can also move forward to the head 9b of the support member 9. As will be described later, the movable member 5 is pressed backward when the portable ladder 2 is leaned against it, but when the portable ladder 2 is removed, the movable member 5 is positioned at the front end position by the movable spring 6. Note that it is also possible to configure the movable member 5 to be supported by the movable spring 6 without providing the support member 9.

[0014] 2, the spring hinge 7 includes two blades 7a, a pivot pin 7b that serves as the center of rotation for each blade 7a, and an opening / closing spring 7c. When no external force is applied to the spring hinge 7, each blade 7a is spread out to approximately 180°, but when an external force is applied to the blades 7a and the angle between them becomes smaller, the opening / closing spring 7c applies a force that spreads each blade 7a out to 180° as shown by the arrow.

[0015] As shown as an attachment mode, the spring hinge 7 has an end of the movable member 5 attached to one wing 7a by screwing or welding, and an end of a retaining metal piece 8 attached to the other end by screwing or welding. As a result, the retaining metal piece 8 is rotatable relative to the movable member 5 around the pivot pin 7b. Note that, as shown as another attachment mode in Figure 2, the end of the movable member 5 or the retaining metal piece 8 can also serve as the wing 7a of the spring hinge 7, or one of the movable member 5 or the retaining metal piece 8 can also serve as the wing 7a.

[0016] The retaining hardware 8 has side retaining portions 10 that restrict lateral movement of the portable ladder 2, and a flat front retaining portion 11 that restricts forward movement of the portable ladder 2. In this embodiment, the two side retaining portions 10 are connected together by a connecting portion 8a, and are attached to the spring hinge 7 at the connecting portion 8a. Therefore, the side retaining portions 10 and the front retaining portion 11 move in synchronization with each other.

[0017] As shown in a perspective view in Figure 3, the side retaining portion 10 is formed in a generally flat plate shape, and moves to a position facing the side of the portable ladder 2 by rotating around the spring hinge 7 as described below. Note that while Figure 3 illustrates the shape of the retaining metal fitting 8 on the right side of Figure 1, the retaining metal fitting 8 on the left side is formed in a shape that is bilaterally symmetrical. Furthermore, the length and width of the side retaining portion 10 and the front retaining portion 11 can be set appropriately depending on the size of the portable ladder 2, and multiple types may be prepared and interchangeable.

[0018] The front surface restraining portion 11 is provided by bending the tip end of the side surface restraining portion 10 inward, and as the side surface restraining portion 10 rotates, it moves to a position facing the front surface of the portable ladder 2. More specifically, when the side surface restraining portion 10 rotates to face the side surface of the portable ladder 2, the front surface restraining portion 11 provided at its tip is positioned in front of the portable ladder 2. The side surface restraining portion 10 and the front surface restraining portion 11 may be formed integrally by sheet metal processing, or may be formed as separate members and joined by welding.

[0019] Additionally, the front retaining portions 11 are provided in a tilted state at a predetermined tilt angle (β) as shown in a side view. In this embodiment, the tilt angle (β) is 75°, the same as the standard angle (θ; see Figure 6) when the portable ladder 2 is leaning against something. Therefore, the front surfaces of the front retaining portions 11 are positioned within a common plane (R), and are positioned so that they are aligned with the front surfaces of the portable ladders 2 that are set at the standard angle.

[0020] In this embodiment, two front restraining portions 11 are provided to restrain the front of the portable ladder 2 at two locations along its length, and the lengths of each front restraining portion 11 are different. Therefore, these two front restraining portions 11 strictly regulate the installation angle of the portable ladder 2 when it is leaned against something. In other words, the front restraining portion 11 also functions as a regulating portion that regulates the installation angle of the portable ladder 2. In addition, two side restraining portions 10 connected to each front restraining portion 11 are also provided to restrain the sides of the portable ladder 2 at two locations along its length.

[0021] Also, although not shown in the figures, the surface of the side support portion 10 facing the portable ladder 2 and the surface of the front support portion 11 facing the portable ladder 2 can be configured to be provided with protective material such as an anti-slip or cushion, or an elastic material such as a rubber sheet that functions as a spacer to fill gaps.

[0022] The number, positions, and shapes of the side surface restraining portions 10 and front surface restraining portions 11 shown here are merely examples and are not limited to these. For example, a honeycomb structure can be used to improve the strength of the side surface restraining portions 10 and front surface restraining portions 11. Also, a configuration in which one side surface restraining portion 10 or one front surface restraining portion 11 is provided, or a configuration in which three or more are provided, or a configuration in which there are no gaps between the side surface restraining portions 10 in FIG. 3, in other words, a configuration in which two front surface restraining portions 11 are provided on the tip side of one side surface restraining portion 10, can be used.

[0023] In addition, by shortening the length of the protrusion 4 so that it does not come into contact with the spring hinge 7 or the retaining metal fittings 8 when the movable member 5 is in the front end position, it is possible to make each retaining metal fitting 8 open 180 degrees when installed, i.e., to reduce the amount of protrusion from the wall surface.

[0024] Next, the operation and effect of the above-described configuration will be explained. As shown in Figure 4 as a pre-assembly state, the fixed bracket 1 has movable mechanisms such as the movable member 5, spring hinge 7, and retaining hardware 8 secured to the fixed member 3 by the support member 9. At this time, as shown in the installed state of the fixed bracket 1, the movable member 5 is positioned roughly at the same level as or slightly behind the front end of the protruding portion 4, so that the back surface of the retaining hardware 8 comes into contact with the protruding portion 4. As a result, the fixed bracket 1 is in a state in which the retaining hardware 8 rotates slightly but does not engage with the front surface of the movable member 5. Hereinafter, this state will be referred to as the open state, and this open state corresponds to the installed state in which the fixed bracket 1 is installed.

[0025] Also, as shown in the ladder fixed state, when the portable ladder 2 is leaned against the fixed bracket 1 in the open state, the movable member 5 is pressed backward, and the spring hinge 7 also moves backward. As a result, the retaining bracket 8 rotates more, and the side retaining members 10 become aligned in the front-to-back direction, that is, facing the sides of the portable ladder 2. At the same time, as the side retaining members 10 move, the front retaining members 11 become aligned in the left-to-right direction, that is, facing the front of the portable ladder 2. This state is called the closed state. This closed state corresponds to a state in which the lateral and forward movement of the portable ladder 2 is restricted.

[0026] Next, the operation of the fixed bracket 1 will be explained along with specific usage patterns. As shown in the installed state in Figure 5, the fixed bracket 1 is installed, for example, near the top edge of a wall. This is because, in order for the fixed bracket 1 to operate, there needs to be enough space above and behind the fixed bracket 1 to allow the movable ladder 2 to be tilted. In Figure 5 and subsequent figures, only the essential parts are labeled with reference numerals to simplify the explanation. Note that the movable ladder 2 is assumed to have multiple rungs 2b between two posts 2a, but it may also be a folding ladder or a sliding ladder whose total length can be changed by sliding.

[0027] Next, as shown in the ladder preparation state, the portable ladder 2 is moved from the front of the fixed bracket 1 in the open state so that it abuts against the movable member 5, and as shown in the leaning state in Figure 6, the movable member 5 is pressed backward by the portable ladder 2, rotating the retaining bracket 8, and the lower end of the portable ladder 2 is pulled out toward the front (left in the figure). As a result, as shown in the fixed state, the portable ladder 2 is installed at approximately 75° with respect to the floor, and the front retaining part 11 abuts against the front surface of the portable ladder 2 and faces the side surface of the portable ladder 2. More precisely, the front retaining part 11 abuts against the front surface of the support 2a of the portable ladder 2.

[0028] In this fixed state, the load applied when a person goes up or down portable ladder 2 is distributed between a downward component along portable ladder 2, indicated by arrow F10, and a component pressing portable ladder 2 against the wall, indicated by arrow F11. In other words, portable ladder 2 is pressed against the floor and wall, and its position in the front-to-back and left-to-right directions is defined by fixing bracket 1, restricting movement in these directions.

[0029] Furthermore, the inclination angle of the portable ladder 2 is determined by the inclination of the front retaining part 11, and in this embodiment, the inclination angle is strictly determined to a standard angle (θ) by the two front retaining metal fittings. In other words, the inclination of the portable ladder 2 is prevented from changing from the state in which it is leaned against something and fixed.

[0030] As a result, portable ladder 2 maintains a standard angle (θ) inclined relative to the floor, even without the need to secure its bottom with a rope or other means, or for it to be supported by another worker. In other words, fixing bracket 1 can independently prevent the top and bottom ends of portable ladder 2 from shifting position, and can also determine the installation angle of portable ladder 2. Furthermore, when removing portable ladder 2, the bottom end of portable ladder 2 is pushed toward fixing bracket 1, and then the top end of portable ladder 2 is pulled toward you, allowing it to be easily removed in the reverse order of when it was leaned against the floor.

[0031] According to the embodiment described above, the following effects can be obtained. The fixing bracket 1 is provided with a side restraining part 10 that is arranged to face the side of the portable ladder 2 and restrains the portable ladder 2 from moving sideways, and a front restraining part 11 that is arranged to face the front of the portable ladder 2 and restrains the portable ladder 2 from moving forward.

[0032] This prevents the portable ladder 2 from moving forward and backward and left and right even if the bottom end is not secured with a rope or supported by another worker. The installation angle of the portable ladder 2 is also specified. Therefore, the fixing bracket 1 alone can prevent the top and bottom ends from shifting, allowing the portable ladder 2 to be used safely.

[0033] Furthermore, with the fixing bracket 1, the side restraining portions 10 and front restraining portions 11 move to positions facing the sides and front of the portable ladder 2 by leaning the portable ladder 2 against it. This makes it possible to prevent movement in the forward / backward and left / right directions simply by leaning the portable ladder 2 against it, allowing the portable ladder 2 to be secured easily and quickly.

[0034] The fixed bracket 1 also has a movable member 5 that moves rearward when the portable ladder 2 is leaned against it and moves forward when the portable ladder 2 is removed, and the side restraining portion 10 is provided at the end of the movable member 5 and rotates as the movable member 5 moves rearward to be positioned opposite the side of the portable ladder 2, and the front restraining portion 11 is provided at the tip of the side restraining portion 10 and is positioned opposite the front of the portable ladder 2 as the side restraining portion 10 moves to a position opposite the side of the portable ladder 2.

[0035] This means that the side retaining parts 10 and front retaining parts 11 do not get in the way when leaning the portable ladder 2 against something, making it possible to easily and quickly secure the portable ladder 2. Furthermore, because the portable ladder 2 can be secured essentially by rotating the side retaining parts 10, the structure of the fixing bracket 1 is not made more complex and its weight is not excessively increased.

[0036] Furthermore, in the fixed fitting 1, the rotating member and the side holding portion 10 are connected by a spring hinge 7, with the movable member 5 fixed to one wing of the spring hinge 7 and the side holding portion 10 fixed to the other wing, and as the movable member 5 moves rearward, the spring hinge 7 closes, causing the side holding portion 10 to rotate and move to a position facing the side of the movable member. This simplifies the rotating mechanism of the side holding portion 10.

[0037] Furthermore, the fixed bracket 1 is equipped with a movable spring 6 that applies a forward force to the movable member 5, and the side support part 10 is positioned so that it does not face the side of the portable ladder 2 when the movable member 5 is pushed all the way forward by the movable spring 6. As a result, by following the steps in reverse to when leaning the ladder against something, the support bracket 8 automatically opens, making it easy to remove the portable ladder 2.

[0038] Furthermore, the front retaining portion 11 of the fixing bracket 1 is provided at an angle. In this embodiment, the front retaining portion 11 is inclined so as to follow the front surface of the portable ladder 2, which is installed at a predetermined standard angle (θ). This makes it easy to determine the installation angle of the portable ladder 2 and also prevents deviation of that installation angle.

[0039] Furthermore, the fixing bracket 1 is provided with multiple front restraining portions 11. This allows the front of the portable ladder 2 to be restrained at multiple points, more reliably restricting forward movement and defining the installation angle of the portable ladder 2.

[0040] The fixture 1 also includes a fixing member 3 with a through-hole, for example, as an attachment structure for attaching it to a wall or a single pipe. This allows the fixture 1 to be attached to any position on the wall or single pipe, improving convenience.

[0041] Furthermore, the fixing bracket 1 includes front restraining portions 11 of different lengths. In the embodiment, a configuration in which two front restraining portions 11 are of different lengths is exemplified, but in a configuration with three or more front restraining portions 11, it is sufficient that at least one of the front restraining portions 11 has a different length. This makes it possible to restrain the portable ladder 2 with any one of the front restraining portions 11 even if the width of the portable ladder 2 varies slightly, thereby improving versatility.

[0042] In the case of the fixed bracket 1, the movable member 5 is urged forward by the movable spring 6, and the opening / closing spring 7c of the spring hinge 7 urges the retaining hardware 8 in an opening direction, so that when the portable ladder 2 is leaning against the wall, a force is always applied in a direction that moves it away from the fixed bracket 1. Therefore, when no load is applied to the portable ladder 2, the top end of the portable ladder 2 may be pushed out, causing the retaining hardware 8 to become open.

[0043] Therefore, as shown in an example in Figure 7, a configuration can be provided in which a restricting member 12 is provided to restrict the side pressing portion 10 from opening when the portable ladder 2 is leaning against the ground. In this case, as shown as an example shape, the restricting member 12 is formed in a C-shape or a U-shape having a front plate 12a and a rear plate 12b formed to extend in the vertical direction, and a connecting plate 12c connecting the front plate 12a and the rear plate 12b. Note that the shape and structure of the restricting member 12 are merely examples and are not limited to these.

[0044] Then, as shown in the non-restricted state, the restricting member 12 is attached to the fixing bracket 1 with the movable member 5 pushed rearward. At this time, an accommodation recess 3b for accommodating the rear panel 12b is provided on the rear surface of the fixing member 3. It is also possible to configure the fixing member 3 to have multiple accommodation recesses 3b, or to configure the fixing member 3 so that the center or appropriate positions on the left and right sides are slightly bulged forward to provide a space for accommodating the rear panel 12b between the rear surface of the fixing member 3 and a wall portion.

[0045] As a result, by attaching the restricting member 12 so as to sandwich it between the fixed member 3 and the movable member 5 as shown in the restricted state, the front plate 12a abuts against the front surface of the movable member 5, and the rear plate 12b abuts against the wall surface of the accommodation recess 3b. As a result, the distance between the fixed member 3 and the movable member 5 is kept constant by the restricting member 12, and the movable member 5, which is pushed backward, is restricted from moving forward, and since the movable member 5 does not move forward, the retaining metal fittings 8 are also restricted from being released.

[0046] Therefore, even when no load is being applied, such as when no one is using the portable ladder 2, the portable ladder 2 is prevented from coming off the fixed fitting 1, further improving safety. Furthermore, the restricting member 12 can be easily restricted by connecting it to the fixed fitting 1 with, for example, a rope or chain, and attaching it when the portable ladder 2 is first used, and removing it when the portable ladder 2 is last used. Furthermore, the restricting member 12 may be structured to directly restrict the side retaining portion 10 from being opened.

[0047] In the embodiment, the configuration in which the side retaining portion 10 and the front retaining portion 11 are rotated by the spring hinge 7 is exemplified, but other configurations can be adopted. Specifically, the side retaining portion 10 is formed in a plate shape that rotates around the shaft member 22, and when the movable member 5 moves rearward, it rotates by coming into contact with the rear side of the shaft member 22, and moves to a position facing the side of the traveling ladder 2.

[0048] For example, as shown in the installed state in Figure 8, the fixing bracket 21 has a retaining metal fitting 28 having a side retaining portion 10 and a front retaining portion 11 that can rotate around an axis member 22 supported by the protrusion 4, and is biased by a rotation spring 23 in a direction that opens the front of the movable member 5. The rear end of the retaining metal fitting 28 is bent into an L-shape, and comes into contact with the movable member 5 when the movable member 5 moves rearward. In Figure 8, parts that are substantially the same as those in the embodiment are given the same reference numerals.

[0049] As shown in the ladder fixed state, by leaning the portable ladder 2 against the table and pressing the movable member 5 backward, the side retaining members 10 rotate to a position facing the side of the portable ladder 2, and as the side retaining members 10 rotate, the front retaining members 11 move to a position facing the front of the portable ladder 2. This restricts the movement of the portable ladder 2 in the left-right direction and forward direction.

[0050] Even with this configuration, it is possible to obtain various effects similar to those of the embodiment, such as being able to prevent the upper and lower ends from shifting positionally using the fixing bracket 21 alone and being able to safely use the portable ladder 2. Furthermore, by configuring the ladder to further include the above-mentioned restricting member 12, safety can be further improved.

[0051] Up to this point, we have illustrated a configuration in which the movable spring 6 biases the movable member 5 forward, but it is also possible to configure the movable member 5 to be pulled backward by the movable spring 6. That is, the ladder fixed state shown in Figure 4 or 8 can be configured to be an installed state in which the portable ladder 2 is not leaned against it. In this case, by hooking one of the support posts 2a of the portable ladder 2 onto one of the front retaining parts 11 and pulling it toward you, the front of the movable member 5 becomes open, as in the installed state shown in Figure 4 or 8, and it becomes possible to lean the portable ladder 2 against the movable member 5.

[0052] In this state, the movable member 5 is pressed backward by the portable ladder 2, causing the side restraints 10 and front restraints 11 to face the portable ladder 2, preventing left-right and forward movement. In this case, the movable member 5 is always pulled backward, so even when no load is applied to the portable ladder 2, the portable ladder 2 will not be pushed forward and come off. Of course, a restricting member 12 can also be provided for added safety. With this configuration, it is possible to independently prevent the upper and lower ends from shifting positions, allowing the portable ladder 2 to be used safely, and various other effects similar to those of the embodiment can be obtained.

[0053] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0054] In the drawings, 1 and 21 indicate fixed fittings, 2 is a movable ladder, 3 is a fixed member, 3a is an attachment hole, 5 is a movable member, 6 is a movable spring, 7 is a spring hinge, 8 and 28 are retaining fittings, 10 is a side retaining portion, 11 is a front retaining portion, and 12 is a regulating member.

Claims

1. a side support portion disposed opposite the side of the portable ladder and configured to prevent the portable ladder from moving sideways; a front restraining portion disposed opposite the front surface of the portable ladder and restraining the forward movement of the portable ladder; Ladder fixing brackets.

2. 2. A ladder fixing bracket according to claim 1, wherein the side restraining portions and the front restraining portions move to positions facing the sides and front of the portable ladder when the portable ladder is leaned against them.

3. a movable member that moves rearward when the portable ladder is leaned against it and moves forward when the portable ladder is released; The side support portion is provided at an end of the movable member, and is rotated as the movable member moves rearward to be positioned opposite the side of the movable ladder, A ladder fixing bracket as described in claim 2, wherein the front restraining portion is provided at the tip of the side restraining portion and is positioned in a position facing the front of the portable ladder as the side restraining portion moves to a position facing the side of the portable ladder.

4. The rotating member and the side surface holding portion are connected by a spring hinge, the movable member is fixed to one wing of the spring hinge, and the side surface holding portion is fixed to the other wing of the spring hinge, 4. A ladder fixing bracket as claimed in claim 3, wherein the side support portion rotates as the spring hinge closes as the movable member moves rearward, and moves to a position facing the side of the movable member.

5. A ladder fixing bracket as described in claim 3, wherein the side support portion is formed in the shape of a plate that rotates around the axis member, and rotates by coming into contact with the rear side of the axis member when the movable member moves rearward, and moves to a position facing the side of the movable ladder.

6. a movable spring that applies a forward force to the movable member; A ladder fixing bracket according to claim 4 or 5, wherein the side support portion is positioned in a position that does not face the side of the portable ladder when the movable member is pushed most forward by the movable spring.

7. 2. A ladder fixing bracket according to claim 1, wherein the front retaining portion is provided at an angle.

8. 2. The ladder fixing bracket according to claim 1, wherein a plurality of the front retaining portions are provided.

9. 9. The ladder fixing bracket according to claim 8, wherein the plurality of front restraining portions include portions of different lengths.

10. 2. A ladder fixing bracket according to claim 1, further comprising a fixing member having a mounting structure for mounting to a wall or a single-tube pipe.

11. 2. A ladder fixing bracket according to claim 1, further comprising a restricting member that restricts the side support portion from being opened when the portable ladder is leaning against the ladder.

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