JP3112689U - Safety stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suspend a stepladder body stably even at a wide range of inclination angles of 45 degrees to 90 degrees, and to perform work at a high place safely and efficiently.
SOLUTION: The distal end portion of a stretchable raceway 6 is brought into contact with a suspended object, and the base portion of the raceway 6 is pivotally attached near the lower end of a stepladder body 1.
A plurality of locking means 6a1 to 6a3 are provided on the upper surface of the stretchable raceway 6, and a "U" shaped stopper 7 is pivotally attached to the left main pillar 1L and the right main pillar 1R of the stepladder body 1 so as to be suspended. On the other hand, when the stepladder body 1 is suspended at a predetermined inclination angle, the raceway 6 is extended or contracted while the tip portion of the stepladder body 1 is suspended on the suspended object, so that one end is brought into contact with the suspended object. By locking the bottom portion 7B of the stopper 7 with any of the locking means 6a1 to 6a3 corresponding to the inclination angle of the stepladder body 1, the intended inclination angle of the stepladder body 1 is kept constant.
[Selection] Figure 1

Description

  In this device, when the stepladder body is suspended on the suspended object, the stepladder body is suspended without falling over at any angle over a range of 45 to 90 degrees, and the height of the stepladder body is increased. The present invention relates to a safety stepladder capable of performing work safely and efficiently.

  Conventionally, when working at high places, such as telecommunications work and exterior wall painting work for buildings such as houses, it is common for workers to use a stepladder and go up the steps of the stepladder body. .

Problems that the device tries to solve

However, the location where the work is performed is not always constant, and depending on the location where the main body of the stepladder is suspended, the location conditions, shape, and suspension angle of the main body of the stepladder are varied.
In addition, when suspending the main body of the stepladder from the suspended object, the Health and Safety Act stipulates that a maximum of 75 degrees should be set in order to prevent the main body of the stepladder from falling and causing an obstacle to the worker. ing.

  Therefore, using the stepladder body to perform work at high places at various construction sites is naturally limited in terms of safety, and the place where the stepladder body is suspended from the suspended object is limited. There is a problem that the use efficiency of the main body and the work efficiency of the construction are poor.

  In order to solve the above-mentioned problems, the present invention is designed in such a manner that the main body of the stepladder is tilted in a stable state with respect to the suspended object at a wide range of inclination angles of 45 to 90 degrees without falling down. The purpose of the present invention is to provide a safety stepladder that can work at a high place with high efficiency and safety in conformity with work conditions.

Means for solving the problem

  In order to achieve the above object, the safety stepladder of the present invention includes a stepladder main body having a plurality of steps formed at a predetermined interval between the left main pillar and the right main pillar, and a base that rotates in the vicinity of the lower end of the stepladder main body. When the upper end of the stepladder body is suspended on the suspended object, it is extended according to the suspension angle of the stepladder body with respect to the suspended object while the tip of the stepladder body is in contact with the suspended object. Alternatively, the scaleway is reduced and stopped at the maximum extension point and the minimum reduction point, and has a plurality of locking means on the upper surface, and is pivotally attached to a predetermined position of the main body of the stepladder, and the stepladder with respect to the suspended object. And a stopper that holds the stepladder body at the predetermined suspension angle by being locked to a predetermined locking means of the plurality of locking means according to a predetermined suspension angle of the main body. It is what.

  With the above-mentioned safety stepladder, the left main pillar of the stepladder main body and the upper end of the right main pillar are brought into contact with the suspended object to suspend the stepladder main body at a predetermined angle, and the base end is pivotally attached to the pivoting member. When the raceway is rotated so that the tip of the raceway comes into contact with the suspended object, the raceway moves according to the suspension angle of the stepladder body and expands or contracts. When the distance between the lower end and the suspended object is fixed, and the raceway reaches the maximum extension point or minimum reduction point, its movement is restricted.

In addition, when the distance between the lower surface of the stepladder body and the suspended object is fixed, the lower end of the stopper is a locking means corresponding to the suspension angle among the plurality of locking means provided on the upper surface of the raceway. The angle between the raceway and the left main pillar and the right main pillar of the stepladder body is kept constant.
Therefore, the stepladder main body can be prevented from falling without the stepladder main body being detached from the suspended object.

Effect of device

  As described above, according to the safety stepladder of the present invention, when the stepladder body is suspended at a predetermined suspension angle with respect to the suspended object, the raceway expands or contracts according to the suspension angle, and the base of the stepladder body Since the distance between the object and the suspended object is kept constant, the stopper is locked to the locking means at the position corresponding to the suspension angle, and the movement is restricted when the raceway is at the maximum extension or minimum reduction, The stepladder body can be stably suspended without being overturned over a wide range of angles ranging from 45 degrees to 90 degrees with respect to the object to be suspended. The construction work can be done at the place.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of the best embodiment of a safety stepladder according to the present invention, and shows a state seen from the back side of the stepladder body.
In FIG. 1, reference numeral 1 denotes a stepladder body which is entirely formed of a metal material such as aluminum. The main body 1 of the stepladder 1 holds the left main pillar 1L and the right main pillar 1R in a parallel state. The front ends of the left main pillar 1L and the right main pillar 1R are covered with protective caps 2R and 2L made of a plastic material or the like. It has been.

A plurality of steps 1a to 1n are attached between the left main pillar 1L and the right main pillar 1R by fixing a crossbar with a bolt (not shown) or the like in parallel with a predetermined interval.
The embodiment shown in FIG. 1 shows a case where the step 1a is the first step (lowermost step) and the step 1n is the uppermost step.

A fixing plate 3 is attached between the left main column 1L and the right main column 1R in the vicinity of the upper ends of the left main column 1L and the right main column 1R, that is, in the vicinity of the protective caps 2R and 2L.
Similarly, a member mounting plate 4 is provided between the left main column 1L and the right main column 1R in the vicinity of the lower ends of the left main column 1L and the right main column 1R, that is, in the vicinity of the first step 1a. It is attached.
The fixed plate 3 is attached so as to be convenient for reinforcing the strength between the left main pillar 1L and the right main pillar 1R, or when attaching a member as appropriate, if necessary, and is not necessarily required. .
Thus, the stepladder body 1 is constituted by the left main pillar 1L, the right main pillar 1R, the steps 1a to 1n, the protective caps 2R and 2L, the fixing plate 3, and the member mounting plate 4.

A pivot attachment device 5 is attached to the member attachment plate 4. The pivoting device 5 is for pivotally pivoting a base portion of an inner tube 6b of a raceway 6 to be described later, and an example of the configuration is shown as an enlarged perspective view in FIG.
As is apparent from FIG. 2, the pivoting means 5 has a pair of support plates 5b and 5c upright at a predetermined interval at the center of a rectangular substrate 5a. These substrate 5a and support plates 5b and 5c are integrally formed.

Insertion holes 5b1 and 5c1 are formed in the central portions of the support plates 5b and 5c, and outside the support plates 5b and 5c, the vicinity of both ends of the substrate 5a are ribs 5a1 and 5a2, respectively.
Screw holes 5a11 and 5a21 are formed in the central portions of the collars 5a1 and 5a2, respectively. The pivoting means 5 is fixed to the stepladder body 1 by screwing the substrate 5a onto the member mounting plate 4 of the stepladder body 1 through these screw holes 5a11, 5a21.

  As shown in FIGS. 1 and 3 (enlarged perspective view showing the state where the raceway 6 is pivotally attached to the pivot means 5), the base portion of the inner tube 6b of the raceway 6 is inserted between the support plates 5b and 5c. Then, through the through holes (not shown) provided in the base portion, the bolts are passed through the insertion holes 5b1 and 5c1 of the support plates 5b and 5c, and screwed with nuts or the like, whereby the raceway 6 is connected to the inner tube. With the base of 6b as a fulcrum, it pivots so that it can rotate in the direction of arrow A1 shown in FIG.

Next, the configuration of the raceway 6 will be described. As is clear from FIG. 1, the raceway 6 has an inner tube 6b having a dimension smaller than that of the outer tube 6a having a rectangular tube shape.
That is, the raceway 6 can be expanded and contracted in the direction of the arrow A2 by inserting and removing the inner tube 6b concentrically into the outer tube 6a.

In order to smoothly and reliably perform the expansion and contraction, a guide rail 6a11 is formed along the longitudinal direction at the center of both side surfaces of the outer tube 6a. Both ends of the guide rail 6a11 are located in the vicinity of both ends of the outer tube 6a.
As shown in FIG. 3, an insertion hole 6b1 is formed in the vicinity of the left end of both side surfaces of the inner tube 6b so that the inner tube 6b of the raceway 6 can move along the guide rail 6a11.
The insertion hole 6b1 is provided at a position corresponding to the guide rail 6a11.
As is apparent from FIGS. 1 and 4 (the left side view of the outer tube 6a in FIG. 1), the inner tube support bar 6d passes through the guide rail 6a11 and the insertion hole 6b1.
The inner tube support rod 6d is provided with a thread groove at least near both ends.

Both ends of the inner tube support bar 6d protrude outside the guide rail 6a11, and both ends of the inner tube support bar 6d are screwed by nuts 6e and 6f on both outer sides of the outer tube 6a.
Thus, as is apparent from FIG. 4, the inner tube support bar 6d is movable in the direction of the arrow A2 along the guide rail 6a11 in a state where the inner tube 6b is stabilized in the outer tube 6a.
The inner tube support bar 6d moves along the guide rail 6a11, so that the raceway 6 can be expanded and contracted. The maximum extension point of the inner tube support bar 6d is restricted from moving at the right end of the guide rail 6a11. In other words, the inner tube 6b is pulled out from the outer tube 6a to the maximum.
Further, the minimum reduction point of the raceway 6 is a point where the movement of the inner tube support bar 6d is restricted at the left end of the guide rail 6a11. The inner tube 6b is inserted into the outer tube 6a at the maximum, and the minimum reduction point. It will be in the state reached.

Further, a plurality of “V” -shaped grooves are formed on the upper surface of the outer tube 6a at predetermined intervals as shown in FIG. 1 in the direction perpendicular to the longitudinal direction (short side direction). Means 6a1, 6a2,... Are formed.
The bottom 7B of the stopper 7 is locked to the locking means 6a1, 6a2,.

As apparent from FIG. 1, the stopper 7 is formed in an upward “U” shape, and the arms 7L and 7R of the stopper 7 are provided on the side surfaces of the left main pillar 1L and the right main pillar 1R of the stepladder body 1. , Pivotally attached at pivot point 8. Thereby, the stopper 7 can be rotated in the arrow A3 direction.
A bottom portion 7B is formed integrally with the arms 7L and 7R. The bottom 7B is brought into pressure contact with one of the “V” -shaped locking means 6a1, 6a2,.
When the bottom portion 7B of the arm 7 is locked to any of the locking means 6a1, 6a2,..., The suspension angle of the stepladder body 1 with respect to the suspended object, that is, the inclination angle is defined.

Next, the operation of this embodiment configured as described above, that is, the usage status of the stepladder body 1 will be described.
FIG. 5 is an explanatory diagram for explaining the use situation of the stepladder main body 1. In the case of FIG. 5, as an example when the stepladder main body 1 is suspended on the suspended object, the suspended object is a building. It shows a case suitable for hanging on the outer wall of a house and painting the outer wall of the house, or for laying a telephone line or a power line.

In FIG. 5, at the predetermined position of the outer wall 9a of the house 9 as a suspended object, the left main column 1L of the stepladder body 1 and the protective caps 2L and 2R at the tip of the right main column 1R are brought into contact with the left side main column 1L. The lower ends of the main pillar 1L and the right main pillar 1R are installed on the ground with a roughly approximate inclination angle.
Next, the end of the outer tube 6a of the raceway 6 (the left end in FIG. 1) is brought into contact with the foundation 9b of the house 9 so that the stepladder body 1 has an optimum suspension angle with respect to the outer wall 9a. The lower ends of the left main column 1L and the right main column 1R are moved back and forth with respect to the outer wall 9a.
That is, by moving the inner tube support bar 6d along the guide rail 6a11 in the direction of arrow A2, the inner tube 6b is moved relative to the outer tube 6a so that the inner tube 6b of the raceway 6 moves in the direction of arrow A2. By inserting / removing, the entire length of the raceway 6 is defined.

When the inner tube 6b is inserted into and removed from the outer tube 6a, when the raceway 6 is fully extended, the maximum extension point is restricted when the inner tube support bar 6d contacts the right end of the guide rail 6a11. Thereby, the inner pipe 6b does not escape from the outer pipe 6a in the right direction.
Similarly, when the raceway 6 is reduced to the minimum, the inner tube support bar 6d abuts against the left end of the guide rail 6a11 and the inner tube 6b is inserted into the outer tube 6a at the maximum. The inner tube 6b is not further pushed out from the left end of the outer tube 6a.
Thereby, the position which contacts the outer wall 9a of the protective caps 2L and 2R of the stepladder body 1 is also automatically defined. As a result, the optimum suspension angle (that is, the optimum inclination angle) of the stepladder body 1 is set.

Thus, even if the optimum suspension angle of the stepladder body 1 is set, in this state, the stability of the stepladder body 1 with respect to the outer wall 9a of the stepladder body 1 is uncertain.
Therefore, in this embodiment, the arm 7L, 7R of the stopper 7 is then rotated in the direction of the arrow A3 with the pivot point 8 as a fulcrum, so that the bottom 7B of the stopper 7 is fixed to a predetermined, for example, locking means 6a3. By locking, the suspension angle of the stepladder body 1 is completely fixed.
Therefore, the suspension angle of the stepladder body 1 with respect to the set outer wall 9a is fixed, and the protective cap 2L. 2R does not slip from the outer wall 9a, and the stepladder body 1 does not fall or fall.

As described above, in the best embodiment, when the stepladder body is suspended at a predetermined suspension angle with respect to the suspended object, the bottom portion of the stopper 7 is fixed to the locking means 6a3 of the raceway 6 corresponding to the suspension angle. By locking 7B, the inclination angle of the stepladder main body 1 can be fixed, so that the stepladder main body 1 can be stably suspended from a suspended object in a wide range of suspension angles from 45 degrees to 90 degrees. Can do.
Thereby, it is possible to stably perform the construction work at a high place without overturning the stepladder main body and to improve the work efficiency at the high place.

  When the stepladder main body 1 is removed from the outer wall 9a and moved to another place, or when the stepladder main body 1 is moved at the end of the construction, the raceway 6 is mounted on the back side of the stepladder main body 1 by the pivoting device 5. The inner tube 6b is inserted into the outer tube 6a, reduced to the shortest reduction dimension, and the base portion is rotated in the left direction of the arrow A1, so that the raceway 6 is parallel to the back side of the stepladder body 1. In this state, the stepladder body 1 and the raceway 6 are brought into close contact with each other and are carried or moved.

  In the above embodiment, the locking means 6a1 and 6a2 are illustrated as having a plurality of “v” -shaped grooves at regular intervals. However, the “V” -shaped grooves are connected not at regular intervals. It is self-evident that the shape (that is, the side surface shape is a sawtooth shape) may be used.

The shape of the locking means 6a1 and 6a2 is not a “V” -shaped groove. For example, as shown in FIG. 6, a rectangular parallelepiped is formed on the upper surface of the outer tube 6a of the raceway 6 at regular intervals. The locking means 6c1, 6c2,... Having the shape of a protrusion may be formed integrally with the outer tube 6a in a direction perpendicular to the longitudinal direction of the outer tube 6a.
In this case as well, as in the case of the above-described embodiment, after defining the suspension angle of the stepladder body 1, the bottom portion 7B of the stopper 7 is fixed to the predetermined locking means 6c1, in order to stably hold the suspension angle. 6c2, 6c3,...

Next, another embodiment of the present invention will be described. FIG. 7 is a perspective view showing the overall configuration of another embodiment, and shows a state viewed from the back side of the stepladder body. In FIG. 7, the same parts as those in the best embodiment are given the same reference numerals to avoid redundant description, and different parts from the best embodiment will be described mainly.
As is apparent from a comparison of FIG. 7 with FIGS. 1 to 5, the portions indicated by reference numerals 1 to 9 are the same as those in the best embodiment, and the portions indicated by reference numerals 10 and later are newly added. Unlike the above-described embodiment, this is a part that characterizes this other embodiment.

That is, the rope fixing member 10 is fixed to the fixing plate 3. The rope fixing member 10 is shown as an enlarged perspective view in FIG.
As is apparent from FIG. 8, the rope fixing member 10 is formed in a rectangular shape, and a block 10a formed in a “convex” shape is fixed at the center thereof.
A through hole 10c is formed at the center of the protrusion 10b of the block 10a. The tip of the wire rope 11 is fixed in the through hole 10c by inserting the tip of the wire rope 11 and winding it around the protrusion 10b several times.

The other end of the wire rope 11 is wound around a reel 13 with a stopper via the pulley device 12 and the raceway 6.
The pulley device 12 is fixed to the upper surface in the vicinity of the tip (left end in FIG. 7) of the outer tube 6a of the raceway 6. The configuration of the pulley device 12 is shown as an enlarged sectional view in FIG.
As shown in FIG. 9, a collar 12 b is provided at the bottom of a support frame 12 a having a cross-sectional shape formed in an upward “U” shape. The collar 12b is fixed to the upper surface of the outer tube 6a of the raceway 6 by a bolt 12c or the like.

A pulley 12d is housed in the portion of the support frame 12a that has the “U” shape. A support rod 12e such as a bolt passes through the central portion of the pulley 12d. Both ends of the support bar 12e are screwed with nuts 12f or the like.
Thus, the pulley 12d is rotatable within the support frame 12a. A groove is formed on the outer peripheral surface of the pulley 12d. A wire rope 11 suspended from the rope fixing member 10 is wound around the groove.
After the wire rope 11 is further inserted from the pulley 12d into the outer tube 6a of the raceway 6 as shown in FIG. 10, the wire rope 11 is wound around the reel 13 with a stopper via the inner tube 6b. Yes.

The stopper-equipped reel 13 is fixed to the member mounting plate 4. The configuration of the reel 13 with stopper will be described with reference to FIG. FIG. 11 is an enlarged perspective view showing the configuration of the reel 13 with stopper.
As shown in FIG. 11, base portions 13dc and 13d of a pair of support plates 13a and 13b that are opposed to a predetermined position of the member mounting plate 4 with a predetermined interval are fixed by screws or the like.
The upper portions of the support plates 13a and 13b are formed in a substantially disk shape, and the base portions 13c and 13d are bent in a right angle direction.

A rotating shaft 13e is rotatably supported at the center of the support plates 13a and 13b. The flanges 13f and 13g (the collar 13g is not shown) are attached to both ends of the rotating shaft 13e.
The other end of the wire rope 11 is wound around the outer peripheral surface of the rotating shaft 13e. During this winding, the wire rope 11 is prevented from being detached from the rotating shaft 13e by the collars 13f and 13g.
A handle 13h penetrating the support plate 13b is connected to one end of the rotating shaft 13e. By rotating the handle 13h in the direction of the arrow A4, the wire rope 11 is wound around or rewound around the rotating shaft 13e.

A stopper handle 13i is attached to a predetermined position of the support plate 13b in order to prevent the wire rope 11 from being unwound in a state where the wire rope 11 is wound around the rotary shaft 13e.
The stopper handle 13i is rotated in the direction of arrow A5 in FIG. 11, thereby stopping the winding and rewinding of the wire rope 11 or releasing the stop of the winding and rewinding.
In conjunction with the operation of the stopper handle 13i, the stopper arm 13j moves up and down in the direction of arrow A6.

When the stopper arm 13j moves in the upward direction of the arrow A6, the pressing force on the wire rope 11 wound around the rotating shaft 13e is released, and when the stopper arm 13j moves in the downward direction of the arrow A6. The winding or unwinding of the wire rope 11 is stopped by pressing the outer peripheral surface of the wire rope 11 wound around the rotating shaft 13e.
In this way, when the winding and rewinding action on the wire rope 11 wound around the rotating shaft 13e by the stopper arm 13j is stopped, the movement of the raceway 6 in the direction of the arrow A2 is stopped, and the raceway 6 The tip of the outer tube 6a comes into contact with the suspended object and the movement of the inner tube 6b stops, so that the suspension angle of the stepladder body 1 with respect to the suspended object is adjusted.

  In other words, in this embodiment, in addition to the functions of the best embodiment, the rope fixing member 10, the wire rope 11, the pulley device 12, and the reel 13 with stopper constitute a suspension angle adjusting means, and the stepladder body This is convenient when the suspension angle defined by 1 and the raceway 6 is further finely adjusted.

Next, the case where the suspension angle of the stepladder body 1 according to this another embodiment is defined will be described. The general definition of the suspension angle with respect to the suspended object by the stepladder body 1 and the raceway 6 is the same as the explanation in FIG. 5 and the explanation is omitted, but at this time, the bottom 7B of the stopper 7 is a locking means. The state is not locked to any of 6a1, 6a2, and 6a3.
When the suspension angle is adjusted after the suspension angle is roughly defined, the other end portion of the wire rope 11 suspended from the rope fixing member 10 is connected to the outer tube 6a of the raceway 6 via the pulley 12d. It passes through the inner tube 6b and is wound around the rotating shaft 13e of the reel 13 with stopper.

In this state, in order to determine the inclination angle of the stepladder body 1 suitable for optimum construction work with respect to the outer wall 9a from the viewpoint of safety and work efficiency, the handle 13h of the reel 13 with stopper 13 is moved to the arrow shown in FIG. Rotate in A4 direction.
In this case, when the inclination angle of the stepladder main body 1 is increased, that is, when the standing state of the stepladder main body 1 is steep, the handle 13h is rotated rightward in FIG. The rotary shaft 13e is wound up.
As a result, the inner tube 6b of the raceway 6 slides into the outer tube 6a in the left direction of the arrow A2 in FIG. That is, the length dimension of the raceway 6 is reduced.

Accordingly, the lower ends of the left main column 1L and the right main column 1R of the stepladder body 1 slide in the left direction (direction of the outer wall 9a) in FIG. 5 and at the same time, the tips of the left main column 1L and the right main column 1R of the stepladder unit 1 The protective caps 2L and 2R slide upward along the outer wall 9a. Thus, fine adjustment of the intended inclination angle of the main body 1 is performed.
When the inclination angle of the stepladder body 1 is finely adjusted in this way, the stopper arm 13j is then operated by rotating the stopper handle 13i of the reel 13 with stopper 13 in the left direction of the arrow A5 shown in FIG. Moves downward in the direction of arrow A6 in FIG.
Thereby, the wire rope 11 wound around the rotating shaft 13e is pressed by the stopper arm 13j, and the wire rope 11 is not unwound from the rotating shaft 13e or taken up.

At the same time, the arms 7L and 7R of the stopper 7 pivotally attached to the left main pillar 1L and the right main pillar 1R are rotated about the pivot point 8 as a fulcrum.
Accordingly, the bottom portion 7B of the stopper 7 is moved to the left in the direction of the arrow A2 in FIG. 7 and is locked by the locking means 6a3 on the upper surface of the outer tube 9a of the raceway 6 to stop.
Thereby, the inclination angle of the stepladder body 1 determined as described above is held.

  Thus, with respect to the outer wall 9a, the stepladder body 1 is arbitrarily set within a range of 45 to 90 degrees with an inclination angle at which the construction work for the outer wall 9a can be easily performed without limiting the inclination angle of 75 degrees. In addition to being able to perform construction work safely and efficiently.

Next, the case where the inclination angle with respect to the outer wall 9a of the stepladder body 1 is made gentle, contrary to the above, will be described.
In this case, the procedure reverse to the above description is taken. That is, by rotating the stopper handle 13i of the reel with stopper 13 in the right direction of the arrow A4 in FIG. 11, the stopper arm 13j is moved in the upward direction of the arrow A6, and the wire rope wound around the rotating shaft 13e. 11 is released.
Next, by lowering the protective caps 2L, 2R of the left main pillar 1L and the right main pillar 1R of the stepladder body 1 along the outer wall 9a, the pivoting member 5 fixed to the member mounting plate 4 of the stepladder body 1 is attached. The base of the inner tube 6b of the raceway 6 that is pivotally moved moves to the right of the arrow A2 in FIG.

That is, the inner tube 6b is pulled out from the outer tube 6a of the raceway 6 and moves in the right direction. Therefore, the raceway 6 is extended.
By extending the raceway 6, the base portions of the left main pillar 1L and the right main pillar 1R of the stepladder body 1 are moved in the right direction in FIG.
Accordingly, the inclination angle of the stepladder body 1 with respect to the outer wall 9a is reduced, and the degree of inclination of the stepladder body 1 with respect to the outer wall 9a is moderated.
Thus, when the left main pillar 1L and the right main pillar 1R of the main body 1 are at a predetermined inclination angle with respect to the outer wall 9a, the stopper handle 13i of the reel 13 with stopper is rotated in the right direction of the arrow A5 in FIG. By moving and lowering the stopper arm 13j, the wire rope 11 wound around the rotating shaft 13e is pressed, so that the wire rope 11 is not wound or unwound from the rotating shaft 13e.

Further, at this time, the bases of the left main column 1L and the right main column 1R of the stepladder main body 1 move in the right direction of the arrow A2 in FIG. 7 so that the arms 7L and 7R of the stopper 7 support the pivot point 8. As shown in FIG.
As a result, the bottom 7B of the stopper 7 moves to the locking means 6a2 of the inner tube 6b of the raceway 6 and stops.
As a result, fine adjustment is performed when the inclination angle of the stepladder body 1 with respect to the outer wall 9a is moderated, and the inclination angle of the stepladder body 1 is kept constant at the finely adjusted inclination angle.

  As described above, in this other embodiment, the stepladder body 1 is supported with respect to the suspended object by the interaction of the elastic raceway 6, the stopper 7, the wire rope 11, and the reel 13 with the stopper. Since the suspension angle is defined by an arbitrary angle in a wide range from 45 degrees to 90 degrees and can be further finely adjusted, the stepladder body can be slid with respect to the suspended object as in the case of the best embodiment, The stepladder body can be stably suspended without falling over, and it is possible to perform construction work at a high place with high efficiency and safety in conformity with various work conditions.

In each of the above embodiments, the raceway 6 is exemplified by the case where the outer tube 6a and the inner tube 6b use two rectangular tubes, but the number of tubes is not particularly limited.
Moreover, although the case where the stepladder main body 1 is a single-unit type is illustrated, it is needless to say that the stepladder main body 1 can also be applied to a double-base, triple-base, etc. stepladder body.

  It is a perspective view which shows the state which looked at the whole structure of the best embodiment of the safety stepladder by this invention from the back side.   It is a perspective view which shows the structure of the pivoting means of the raceway used for the safety stepladder of this invention.   It is an expansion perspective view showing the state where the raceway used for the safety stepladder of this device was pivotally attached to the pivoting device.   It is a left side view of the raceway used for the safety stepladder of this device.   It is explanatory drawing for demonstrating the use condition when the safety stepladder of this invention is suspended on the outer wall of a house.   It is a perspective view which shows the modification of the latching means used for the safety stepladder by this invention.   It is a perspective view which shows the state which looked at the whole structure of another embodiment of the safety stepladder by this invention from the back surface side.   It is a perspective view which shows the structure of the rope fixing member in another embodiment of the safety stepladder by this invention.   It is an expanded sectional view which shows the structure of the pulley apparatus in another embodiment of the safety stepladder by this invention.   It is a perspective view which shows the state which the wire rope in another embodiment of the safety stepladder by this invention penetrates the inside of a raceway.   It is a perspective view which shows the structure of the reel with a stopper in another embodiment of the safety stepladder by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stepladder body 1a-1n Step 2L Left main pillar 2R Right main pillar 3 Fixing plate 4 Member mounting plate 5 Pivoting means 6 Raceway 6a Outer pipe 6b Inner pipe 6a1-6a3, 6c1-6c3 Locking means 6a11 Guide rail 6d Inner tube support bar 6e, 6f Nut 7 Stopper 7B Bottom 8 Pivoting point 9 House 9a Outer wall 10 Rope fixing member 11 Wire rope 12 Pulley device 12d Pulley 13 Reel with stopper

Claims (1)

A stepladder body having a plurality of steps formed at a predetermined interval between the left main pillar and the right main pillar;
A base is pivotally mounted in the vicinity of the lower end of the stepladder main body, and when the upper end of the stepladder main body is suspended on the suspended object, the stepladder main body is brought into contact with the suspended object while the tip of the stepladder body is in contact with the suspended object. A raceway that expands or contracts by moving according to a suspension angle with respect to the suspended object, stops moving at the maximum extension point and the minimum reduction point, and has a plurality of locking means on the upper surface,
The stepladder is pivotally attached to a predetermined portion of the stepladder body, and is locked to a predetermined locking means of the plurality of locking means according to a predetermined suspension angle of the stepladder body with respect to the suspended object. A stopper for holding the main body at a predetermined suspension angle;
A safety stepladder characterized by comprising:

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