JP2006207173A - Ladder stabilizing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ladder stabilizing device capable of preventing a ladder from being turned over or rolled in the lateral direction to secure safety in a high lift work by fixing to the eaves end part of a roof in the tensed state of the ladder by a reaction between pads and the ground-contact face of the ladder. <P>SOLUTION: This ladder stabilizing device 10 comprises a first member 12 having pads 11 allowed to pressingly fit to the roughly horizontal lower surface of a structure on which the ladder 1 is hung, a second member 13 fixed to the ladder, and a link means 14 connecting the first member to the second member so as to be vertically moved while always maintaining the pad surfaces of the first member in the roughly horizontal state. When the ladder is hung on the structure at a prescribed inclination angle, the pad surfaces of the first member is pressingly fitted to the roughly horizontal lower surface of the structure to stabilize the ladder by a reaction produced between the pad surfaces and the tread of the ladder. The reaction can be provided by giving an energizing force in a direction for raising the first member by a spring 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ladder stabilizing device for stabilizing a ladder leaning on an eaves edge of a roof or the like for working at a high altitude, thereby ensuring work safety.

  In order to work at high places in building construction sites and painting sites, ladders are erected on the edge of the eaves of the roof. In general, the leaning angle of the ladder is about 75 degrees, and in addition to the worker climbing the ladder, an adult assistant supports the ladder and uses it so that the grounding point does not shift. In many cases, there are many accidents that fall frequently because one worker is working alone (without an assistant).

Based on such a current situation, a ladder overturn prevention tool for preventing a fall by fixing the ladder to an eaves edge of a roof or the like is described in Patent Document 1 below. The overturn prevention device includes a main body that is detachably attached to the ladder, and a movable part that is rotatable with respect to the main body and that comes into contact with a protruding object such as an eaves end from below. After leaning the ladder at a predetermined angle, the movable part is rotated (raised) by a rope operation from the ground, the pad comes into contact with the lower surface of the protruding part, and the ladder is fixed to the building by locking the movable part at that position. I am doing so.
Japanese Patent Laid-Open No. 2003-262082

  However, according to the above prior art, when the ladder is used, the movable portion is in a locked state, and no force in the direction of pressing the pad against the lower surface of the protruding portion works. For this reason, there is no reaction force between the pad and the tread surface (grounding surface) of the ladder, and the ladder cannot be stably installed in a stretched state between them, preventing a ladder from falling over. Even if it can, it cannot be prevented from wobbling in the lateral direction.

  According to this prior art, the first operating rope for releasing the locked state of the movable part, and the movable part is spring-biased while the movable part is unlocked by lowering the first operating rope. A second operation rope for rotating in a direction to be pulled away from the lower surface of the protruding portion is suspended so that each can be operated from the ground. For this reason, when working at a high place using a ladder, if the first and second ropes are pulled down simultaneously for some reason, the pad will move away from the lower surface of the protruding portion, causing lateral wobble. In some cases, the fall prevention effect is lost.

  Therefore, the problem to be solved by the present invention is that the ladder can be stably fixed to the eaves edge of the roof by the reaction force between the pad and the ground contact surface of the ladder, and the overturn and sideways can be fixed. It is an object of the present invention to provide a ladder stabilizer having a novel configuration capable of preventing the wobbling of the direction and ensuring the safety of work at a high place.

  In order to achieve this object, the present invention according to claim 1 includes a first member having a pad that can be pressed against a substantially horizontal lower surface of a structure on which a ladder is stood, and a second member fixed to the ladder. And a link means for connecting the first member and the second member so as to be movable up and down while always holding the pad surface of the first member substantially horizontal, and a ladder is attached to the structure. The pad surface of the first member is pressed against the substantially horizontal lower surface of the structure when leaned at an inclination angle, and the ladder is stabilized by a reaction force generated between the pad surface and the tread surface of the ladder. Ladder stabilizer.

  According to a second aspect of the present invention, there is provided the ladder stabilizer according to the first aspect, wherein the second member is in contact with the back surface of the strut in a state of being spanned between the pair of struts of the ladder; A hook-shaped locking member that locks an arbitrary step and a fixing means for fixing the locking member that locks the step to the backing plate.

  According to a third aspect of the present invention, in the ladder stabilizer according to the first aspect, the second member is slidably attached to the pair of struts of the ladder.

  According to a fourth aspect of the present invention, there is provided the ladder stabilizer according to the first aspect, wherein the second member is in contact with the back surface of the strut in a state of being spanned between the pair of struts of the ladder; An insertion pipe that is inserted into and penetrates an arbitrary step, a pair of brackets that are integrally provided on the backing plate to support both ends of the insertion pipe that passes through the step, and an insertion pipe that passes through the step And a movement preventing means for preventing axial movement and rotation.

The present invention according to claim 5 is the ladder stabilizer according to any one of claims 1 to 4, wherein the pad provided at the upper end of the first member includes a urethane material, a lining material, and a disk material. It is formed by these.
It is characterized by that.

  According to a sixth aspect of the present invention, in the ladder stabilizer according to any one of the first to fifth aspects, biasing means for providing a biasing force in a direction in which the first member is raised is provided, and the ladder is fixed to the structure. The pad surface of the first member is in pressure contact with the substantially horizontal lower surface of the structure by the urging force of the urging means when stood at an inclination angle of.

  According to a seventh aspect of the present invention, in the ladder stabilizer according to any one of the first to sixth aspects, the angle of the link means for connecting the first member and the second member is made variable in several steps. A height adjusting mechanism for adjusting the height position of the pad is provided.

  The present invention according to claim 8 is the ladder stabilizer according to claim 7, wherein the height adjusting mechanism further finely adjusts the height position of the pad by making the length of the link means variable in several stages. A fine adjustment means is provided.

  According to the first aspect of the present invention, when the ladder is leaned against the structure at a predetermined inclination angle, the pad surface of the first member is pressed against the substantially horizontal lower surface of the structure, and the pad surface and the ladder are The ladder can be stabilized by the reaction force generated between the ladder and the tread, so that when working at a high altitude using the ladder, the ladder falls over even if there is no assistant to support the ladder on the ground. Work safety can be achieved without wobbling.

  According to the second aspect of the present invention, the hook-shaped locking member is locked to an arbitrary step of the ladder, and the hook-shaped locking member is fixed to the backing plate in this state. The device can be fixed securely and immovably.

  According to the third aspect of the present invention, since the second member is slidably attached to the ladder, when the ladder is leaned against the structure at a predetermined inclination angle, the pad surface of the first member is It becomes easy to position the pad at such a height that it is pressed against the substantially horizontal lower surface of the structure to ensure that a reaction force is generated between the pad surface and the tread surface of the ladder.

  According to the fourth aspect of the present invention, the caulking plate is attached in such a manner that the insertion pipe is inserted and penetrated into an arbitrary step of the ladder and the axial movement and rotation thereof are impossible. Therefore, the ladder stabilizer can be securely and immovably fixed to the ladder.

  According to the fifth aspect of the present invention, since the pad is formed of a high coefficient of friction material, the pad is securely and immovably pressed against the lower surface of the structure on which the ladder is leaned, and the fall due to the reaction force is prevented. The effect of preventing wobble can be surely exhibited.

  According to the sixth aspect of the present invention, since the urging means for providing the urging force in the direction of raising the first member is provided, the urging force when the ladder is leaned against the structure at a predetermined inclination angle. Thus, the pad surface can be brought into pressure contact with the lower surface of the structure, and a reaction force can be applied more effectively between the pad surface and the ladder tread surface.

  According to the seventh aspect of the present invention, since the height position of the pad can be adjusted in several stages, when the ladder is leaned against the structure at a predetermined inclination angle, the pad surface of the first member is It becomes easy to position the pad at such a height that it is pressed against the substantially horizontal lower surface of the structure to ensure that a reaction force is generated between the pad surface and the tread surface of the ladder.

  According to the eighth aspect of the present invention, since the height position of the pad can be finely adjusted, the pad surface of the first member is structured when the ladder is leaned against the structure at a predetermined inclination angle. It becomes even easier to position the pad at such a height that it is pressed against the substantially horizontal lower surface of the object to ensure that a reaction force is generated between the pad surface and the tread surface of the ladder.

The ladder stabilizer according to the present invention will be described in detail with reference to the drawings.

  A ladder stabilizer 10 according to the first embodiment shown in FIGS. 1 and 2 includes a substantially U-shaped movable member 12 having a pad 11 on the upper surface, a fixed member 13 fixed to an arbitrary step 2 of the ladder 1, And a parallel link 14 connecting them. The pad 11 is preferably formed of a material having a large friction coefficient, such as a urethane material, a lining material, or a disk material.

The fixing member 13 includes a wide pad 15 extending between the columns 3 and 3 on the lower surface side of the ladder 1, and a bolt shaft 17 a penetrating the horizontal slots 16 and 16 formed on the left and right of the pad 15. 1 and the hook 17b at the tip thereof is locked to the ladder step 2 and the bolt shaft 17a of the locking member 17 is screwed to fix the backing plate 15 to the ladder 1. And a nut 18 for A pair of the locking member 17 and the nut 18 are used at positions close to the pillars 3 and 3 of the ladder 1, respectively, and the laterally long slots 16 and 16 enable a slight adjustment in the lateral direction. A pair of vertical plates 19 and 19 are fixed at the center of the abutting plate 15 at a predetermined interval.
The parallel link 14 has a pair of left and right parallel lower link arms 20 and 20 and upper link arms 21 and 21, respectively. Each link arm 20, 21 is located between a pair of vertical plates 19, 19 and sandwiches both side plates 12 a, 12 a of the movable member 12, and the movable member 12 always keeps its pad 11 surface substantially horizontal. However, it is connected to the fixing member 13 so as to be movable up and down. In this embodiment, the pad 11 surface is configured to be substantially horizontal when the angle at which the ladder 1 is leaned (the inclination angle of the contact plate 15) is 75 degrees.

  A pair of left and right reaction force springs 23 and 23 are wound around a support shaft 22 serving as a rotation center on the fixed member 13 side of the lower link arms 20 and 20, thereby moving the movable member 12 to a lower limit position (solid line in FIG. The urging force is always applied in the direction of raising from the upper limit position (illustrated by phantom lines in the figure) from the figure. One end of the reaction spring 23 is in contact with the contact plate 15, and the other end is locked to a stopper 24 fixed between the vertical plates 19 and 19.

  The usage and operation of the ladder stabilizer 10 configured as described above will be further described with reference to FIG.

  First, the ladder 1 is temporarily leaned against a horizontal structure 4 such as an eave or a horizontal member at an inclination angle of θ1 = 60 to 70 degrees, and in this state, the step 2 located near the lower side of the structure 4 is placed on the ladder. It is determined as the step 2 to which the stabilizer 10 is to be attached.

  Then, the ladder 1 is once lowered, and the front hook 17b of the locking member 17 is hung on the step 2 determined to be attached with the ladder stabilizer 10, and the nut 18 is fastened to the bolt shaft 17a to attach the contact plate 15 to the ladder 1. The lower end of the ladder 1 (with the anti-slip unit 5 fitted) is grounded at the A position. At this time, the pad 11 is located close to the lower surface 4a of the structure.

  Thereafter, the ladder 1 is pushed in by hand to move the contact point from A to B, and the inclination angle of the ladder 1 is set to θ2 = about 75 degrees. As the inclination angle of the ladder 1 increases from θ1 to θ2, the position of the step 2 to which the ladder stabilizer 10 is attached increases, and the pad 11 comes into pressure contact with the structure lower surface 4a, and the structure lower surface 4a and the tread The reaction force of the reaction force spring 23 acts on the That is, the movable member 12 including the pad 11 is pushed down from the upper limit position indicated by the phantom line to the lower limit position indicated by the solid line against the urging force of the reaction force spring 23 in FIG. The pad 11 is pressed against the structure lower surface 4a. Further, since the ladder columns 3 and 3 are slightly bent, the reaction force generated thereby increases the pressure contact force. Therefore, the ladder 1 is fixedly fixed in a stretched state between the structure lower surface 4 a and the tread surface 6.

  The ladder stabilizer 30 of the second embodiment shown in FIGS. 4 to 6 includes a substantially U-shaped movable member 32 having a pad 31 on the upper surface, and a fixed member 33 fixed to an arbitrary step 2 of the ladder 1. And a parallel link 34 connecting them. The pad 31 is preferably formed of a material having a large friction coefficient, such as a urethane material, a lining material, or a disk material.

  The fixing member 33 has a wide pad 35 extending between the columns 3 and 3 on the lower surface side of the ladder 1 and an insertion pipe 36 that is inserted into the step 2 and extends in the horizontal direction. . Brackets 37 (37a, 37b) extending vertically from the left and right ends of the abutting plate 35 are provided, and these brackets 37 are located outside the support columns 3, 3 of the ladder 1. The insertion pipe 36 penetrates the inside of the step 2 and protrudes outward from the pillars 3 and 3 of the ladder 1. A bolt 38 passing through one end of the insertion pipe 36 is attached, and a spring pin 40 penetrating the other end is attached. . A pipe 39 through which the insertion pipe 36 can be inserted is fixed by welding to the outside of the bracket 37b. U-grooves (not indicated) facing each other at an interval of 180 degrees are formed in the pipe 39, and a spring pin 40 is provided in the U-groove. Be contained. When attaching the insertion pipe 36, with the spring pin 40 set at one end thereof, the other end side is inserted into the step 2 from the pipe 39 and the pipe insertion hole (not indicated) of the bracket 37b, and the spring pin 40 is inserted. The insertion pipe 36 is fixed to the other end of the insertion pipe 36 that protrudes to the outside of the bracket 37a by passing the bolt 38 in accordance with the position of the opposing U groove of the pipe 39. In this state, the insertion pipe 36 cannot be moved in the axial direction by the bolt 38 and the spring pin 40, and cannot be rotated because the spring pin 40 is fitted in the opposing U groove of the pipe 39.

  Each of the parallel links 34 has a pair of left and right parallel lower link arms 41 and 41 and upper link arms 42 and 42. Each link arm 41, 42 is positioned between a pair of vertical plates 43, 43 fixed at a predetermined interval in the center of the abutting plate 35, and sandwiches both side plates 32a, 32a of the movable member 32, The movable member 32 is connected to the fixed member 33 so as to be movable up and down while the surface of the pad 31 is always kept substantially horizontal. In this embodiment, the pad 31 surface is configured to be substantially horizontal when the angle at which the ladder 1 is leaned (the inclination angle of the contact plate 35) is 75 degrees.

  The ladder stabilizer 30 according to this embodiment includes a mechanism for adjusting the height of the pad surface 31 of the movable member 32. That is, the lower link arms 41 and 41 are pivotally supported on the vertical plates 43 and 43 by the shaft 44, but are concentrically with the shaft 44 in any of the plurality of mounting holes 45 formed in the vertical plates 43 and 43. By setting the insertion / extraction pin 46, it is fixed to the vertical plates 43, 43, the angle of the parallel link 34 is determined, and the height position of the pad 31 is determined. Therefore, the height of the pad 31 can be changed by changing the mounting hole 45 in which the insertion / removal pin 46 is set. In FIG. 4, the position of the pad 31 when the insertion / removal pin 46 is set in the central mounting hole 45 is indicated by a solid line, and the pad position when this is set in the upper and lower mounting holes 45 is indicated by a virtual line. Has been. The number of attachment holes 45 and the angle interval are arbitrary, and by providing a larger number of attachment holes 45, the number of height positions that can be taken by the pad 31 can be set to a larger number, and the angle intervals of the attachment holes 45 can be set. By changing, the height position interval of the pad 31 can be changed.

  Furthermore, in this embodiment, shaft holes 49a and 49b to which connecting shafts 47 and 48 for connection with the movable member 32 are formed at equal intervals in the lower link arm 41 and the upper link arm 42, respectively. Crab connecting shafts 47 and 48 are attached to connect the movable member 32. Therefore, the pad height position roughly adjusted by the selection of the mounting hole 45 for setting the insertion / extraction pin 46 can be further finely adjusted by the selection of the shaft holes 49a and 49b. The number and interval of the shaft holes 49a and 49b are arbitrary, and by providing a larger number of shaft holes 49a and 49b, the number of height positions that the pad 31 can take by this fine adjustment can be set. By changing the interval between the shaft holes 49a and 49b, the height position interval of the pad 31 by this fine adjustment can be changed.

  The usage of the ladder stabilizer 30 configured as described above will be described. The ladder 1 is temporarily leaned against a horizontal structure 4 such as an eave or a horizontal member at an inclination angle of θ1 = 60 to 70 degrees, and the structure is After determining the step 2 located near the lower side of the object 4 as the step 2 to which the ladder stabilizer 30 is to be attached, the ladder 1 is once lowered to the ground, and the pillars 3 on both sides are positioned close to the step 2. , 3, with the abutting plate 35 laid over the lower surface side, the insertion pipe 36 is inserted into the step 2 as described above, and fixed by the fixing bolt 38 and the spring pin 39. In this way, the ladder 1 on which the ladder stabilizer 30 is fixed to the step 2 is again leaned at an inclination angle θ1 = 60 to 70 degrees. If the pad 31 hits the lower surface 4a of the structure at this time or is far away below the structure, the pad 31 is adjusted to an appropriate height position through the pad height adjusting mechanism described above. After confirming that the pad 31 is positioned immediately below the lower surface 4a of the structure, the lower end of the ladder 1 is pushed in so that the inclination angle is θ2 = about 75 degrees. Since the position of the step 2 to which the ladder stabilizer 30 is attached increases as the inclination angle of the ladder 1 increases from θ1 to θ2, the pad 11 comes into pressure contact with the lower surface 4a of the structure, and the ladder supports 3 and 3 Due to the bending, a reaction force acting between the structure lower surface 4a and the tread surface 6 is generated, and the ladder 1 is fixed between the structure lower surface 4a and the tread surface 6 in a stretched state.

  A ladder stabilizer 50 according to the third embodiment shown in FIGS. 7 to 9 is fixed to a substantially U-shaped movable member 52 having a pad 51 on the upper surface and the columns 3 and 3 of the ladder 1 so as to be slidable up and down. A fixing member 53 and a parallel link 54 connecting them. Since the pad 51, the movable member 52, and the parallel link 54 are the same as the pad 11, the movable member 12, and the parallel link 14 in the ladder stabilizer 10 of the first embodiment, description thereof is omitted. Also, the connection configuration between the fixing member 53 and the parallel link 54 and the reaction force spring 55 are the same as the connection configuration between the fixing member 13 and the parallel link 14 and the reaction force spring 23 in the ladder stabilizer 10 of the first embodiment. Description is omitted.

  The ladder stabilizer 50 is different from the ladder stabilizer 10 of the first embodiment in the structure and method for fixing the ladder stabilizer 50 to the ladder 1 via the fixing member 53. The fixing member 53 has a backing plate 56 that is substantially the same as the backing plate 15 in the ladder stabilizer 10 of the first embodiment, but has a U-shaped fitting portion that slidably fits the columns 3 and 3 at both ends thereof. 57 (57a, 57b) is formed. Each U-shaped fitting portion 57 is bent at a right angle from the end portion in the width direction of the contact plate 56 and is extended at a right angle from the front end of the side surface portion 58 and a side surface portion 58 extending in parallel with the flat surface portion 3 a of the support column 3. And a folding surface portion 59 extending in parallel with the contact plate 56. The distance between the backing plate 56 and the folded surface portion 59 is substantially the same as the width of the support column 3, and when the support column 3 is fitted to the U-shaped fitting portion 57, both flange surfaces 3 b and 3 b are The contact plate 56 and the inner surface of the folded surface portion 59 are in a positional relationship substantially in contact with each other. The front ends of the flange surfaces 3b, 3b of the support column 3 are bent inward to form projecting portions 3c, 3c. The front end portion of the folded surface portion 59 and the inner surface of the corresponding portion of the contact plate 56 are respectively Engagement pieces 60, 60 for engaging the protrusions 3c, 3c are fixed. The fixing member 53 is slidably attached to the pillars 3 and 3 in the longitudinal direction of the ladder through the engagement between the engagement pieces 60 and 60 and the pillar protrusions 3c and 3c.

  Two (or more if desired) screw holes (not indicated) are formed in the side surface 58 of one U-shaped fitting portion 57a of the contact plate 56, and the tightening knob 61 is provided in each screw hole. The fixing member 53 is fixed to the ladder 1 by screwing and tightening the bolt shaft, and the urethane pad 62 attached to the tip of the bolt shaft is pressed against the flat portion 3a of the support column 3, so that the attachment position can be kept immovable.

  According to such a fixing member 53, the fixing position of the ladder stabilizer 50 with respect to the ladder 1 can be arbitrarily selected, and if the tightening knob 61 is loosened, it can be slid along the columns 3 and 3. Position adjustment is also easy. Further, the ladder stabilizer 50 can be fixed at an arbitrary height position regardless of the position of the step 2.

  The usage and operation of the ladder stabilizer 50 configured as described above will be described. The ladder 1 is temporarily leaned against the horizontal structure 4 such as an eave or a horizontal member at an inclination angle θ1 = 60 to 70 degrees, and in this state. 7 is provided with a position where the ladder stabilizer 50 should be attached so that the pad 51 indicated by the phantom line is located at a height close to the lower side of the structure 4, and the ladder 1 is once lowered to the ground. The ladder stabilizer 50 is slid in that position and then fixed. This fixing is performed by tightening the tightening knob 61 and pressing the urethane pad 62 at the front end against the side surface of the column. Thus, after fixing the ladder stabilizer 50 at a predetermined height position with respect to the pillars 3 and 3 of the ladder 1, the ladder 1 is leaned again at an inclination angle angle θ1 = 60 to 70 degrees. If the pad 51 hits the lower surface 4a of the structure at this time, or is far away below the structure 51, the tightening knob 61 is loosened and slid to an appropriate height position, and then the tightening knob 61 again. To fix the position. After confirming that the pad 51 is positioned immediately below the lower surface 4a of the structure, the lower end of the ladder 1 is pushed in so that the inclination angle is θ2 = about 75 degrees. As the inclination angle of the ladder 1 increases from θ1 to θ2, a reaction force of the reaction force spring 23 acts between the structure lower surface 4a and the tread surface 6. That is, the movable member 52 including the pad 51 is pushed down from the upper limit position indicated by the phantom line to the lower limit position indicated by the solid line against the urging force of the reaction force spring 55 in FIG. The pad 51 is pressed against the structure lower surface 4a. Further, since the ladder columns 3 and 3 are slightly bent, the reaction force generated thereby increases the pressure contact force. Therefore, the ladder 1 is fixedly fixed in a stretched state between the structure lower surface 4 a and the tread surface 6.

It is a side view of the ladder stabilizer by one Embodiment of this invention. It is a front view of this ladder stabilizer. It is a figure explaining the usage and an effect | action of the ladder stabilizer by this embodiment. FIG. 6 is a side view of a ladder stabilizer according to another embodiment of the present invention. It is a front view of this ladder stabilizer. It is a top view of this ladder stabilizer. FIG. 6 is a side view of a ladder stabilizer according to yet another embodiment of the present invention. It is a front view of this ladder stabilizer. It is an enlarged view which shows the fitting state of the fixing member and support | pillar in this ladder stabilizer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladder 2 Ladder step 3 Ladder support 4 Horizontal structure 5 Non-slip unit 6 Tread surface 10 Ladder stabilizer 11 Pad 12 Movable member (first member)
13 Fixing member (second member)
14 Parallel links (link means)
15 Abutting plate 16 Horizontal slot 17 Locking member 18 Nut (fixing means)
19 Vertical plate 20 Lower link arm 21 Upper link arm 22 Support shaft 23 Reaction force spring (biasing means)
24 Stopper 30 Ladder stabilizer 31 Pad 32 Movable member (first member)
33 Fixing member (second member)
34 Parallel links (link means)
35 Baffle plate 36 Insertion pipe 37 (37a, 37b) Bracket 38 Bolt 39 Pipe 40 Spring pin 41 Lower link arm 42 Upper link arm 43 Vertical plate 44 Shaft 45 Mounting hole 46 Insertion pin 47 Connecting shaft 48 Connecting shaft 49a, 49b Shaft hole 50 Ladder stabilizer 51 Pad 52 Movable member 53 Fixed member 54 Parallel link 55 Reaction force spring 56 Contact plate 57 U-shaped fitting portion 58 Side surface portion 59 Folding surface portion 60 Engagement piece 61 Tightening knob 62 Urethane pad

Claims (8)

The first member having a pad that can be pressed against the substantially horizontal lower surface of the structure on which the ladder is leaned, the second member fixed to the ladder, and the pad surface of the first member are always kept substantially horizontal. And a link means for connecting the first member and the second member to be movable up and down while the pad surface of the first member is structured when the ladder is leaned against the structure at a predetermined inclination angle. A ladder stabilizer that presses against a substantially horizontal lower surface of an object and stabilizes the ladder by a reaction force generated between the pad surface and the tread surface of the ladder. The second member is in a state of being spanned between a pair of struts of the ladder, a contact plate that comes into contact with the back surface of the strut, a hook-shaped locking member that locks any step on the ladder, and a step The ladder stabilizer according to claim 1, further comprising a fixing means for fixing the locked locking member to the contact plate. The ladder stabilizer according to claim 1, wherein the second member is slidably attached to the pair of struts of the ladder. The second member is in a state of being spanned between the pair of pillars of the ladder, the contact plate that contacts the back surface of the pillar, the insertion pipe that is inserted into and penetrates the arbitrary step of the ladder, and the step A pair of brackets integrally provided on the backing plate to support both ends of the inserted insertion pipe and a movement preventing means for preventing the axial movement and rotation of the insertion pipe that has penetrated the stepper are provided. The ladder stabilizer according to claim 1. The ladder stabilizer according to any one of claims 1 to 4, wherein a pad provided on an upper end of the first member is formed of a high coefficient of friction material including a urethane material, a lining material, and a disk material. An urging means for applying an urging force in the direction of raising the first member is provided, and the pad surface of the first member is structured by the urging force of the urging means when the ladder is leaned against the structure at a predetermined inclination angle. 6. The ladder stabilizer according to claim 1, wherein the ladder stabilizer is in pressure contact with a substantially horizontal lower surface of the object. The height adjusting mechanism for adjusting the height position of the pad by changing the angle of the link means for connecting the first member and the second member in several steps. 6. The ladder stabilizer according to any one of 6 above. 8. The ladder stabilizer according to claim 7, wherein the height adjusting mechanism further comprises fine adjusting means for finely adjusting the height position of the pad by making the length of the link means variable in several steps. .

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