JPH0635598U - Stepladder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a stepladder that allows the rear column to move freely, stabilizes the standing state, and maintains strength. [Structure] A rotating frame 3 is rotatably attached to the other side of a top bar 1 to which a ladder support 2 is fixed. One end of the rear column 6 is pivotally supported on the rotating frame 3 so that the other end can move in the longitudinal direction of the rotating frame 3. Opening stopper 8 for restricting the above movement of the rear column 6
Is formed in a frame shape so as to surround the rear support 6, and is fixed to the rotary frame 3 via the reinforcing material 7. As a result, the rear strut 6 can be moved in a direction orthogonal to and parallel to the stepping rails 2b of the ladder strut 2, and it is possible to easily set up the stepladder only by moving the rear strut 6 without moving the stepladder itself. It can be carried out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stepladder, and more particularly, to an improvement of a stepladder used for landscaping or caring for plants.

[0002]

[Prior art]

 As a conventional stepladder of this kind, a ladder column is fixed to one side of the top board crossing a plurality of stepped rails at appropriate intervals, and a rear column is attached to the other side of the top board in a direction orthogonal to the stepped rail. A stepladder that is rotatably pivoted is known (see Japanese Utility Model Publication No. 61-161400 and Japanese Utility Model Publication No. 3-89898). This type of conventional stepladder is used in a state where the rear strut is spread out toward the ladder strut, and the other end of the chain, one end of which is attached to the ladder strut, is attached to the rear strut. Has become.

When the stepladder configured as described above is used for landscaping and maintenance of plants, etc., if there are obstacles such as trees, grass, ponds or stones on the ground, the standing state becomes unstable. , It is necessary to avoid these obstacles and set the stepladder.

[0004]

[Problems to be solved by the device]

 However, in this type of conventional stepladder, the rear strut does not move only in the direction orthogonal to the step rail, so the rear strut cannot avoid obstacles and must move and position the entire stepladder. It was annoying.

As a means for solving this problem, it is conceivable to pivotally mount the rear support column in a direction parallel to the step bar, but in this way, the rear support column is merely bidirectional (orthogonal to the step bar). And in the parallel direction), the standing state of the stepladder becomes unstable and the strength is weak.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a stepladder which has a degree of freedom in movement of a rear supporting column, stabilizes a standing state, and can maintain strength. It is a thing.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the stepladder of the present invention is attached to one side of a top bar and a ladder column that laterally bridges a plurality of step bars at appropriate intervals and to the other side of the top bar. Assuming a stepladder consisting of a rear strut to be mounted, a rotating frame is rotatably attached to the top plate rail, and one end of the rear strut is attached to the rotating frame so that the other end moves in the longitudinal direction of the rotating frame. An opening stopper that pivotally supports and restricts the movement of the rear support column is formed in a frame shape so as to surround the rear support column, and is fixed to the rotary frame through a reinforcing material.

In the present invention, the opening stopper may be of any shape as long as it is formed in a frame shape surrounding the rear supporting column and restricts the longitudinal movement of the rotating frame of the rear supporting column. For example, it may be an elliptical frame, a circular frame or a rectangular frame.

Further, it is also possible to integrally form an auxiliary step plate on the opening stopper, and it is advantageous in that the number of members can be reduced by forming in this way.

[0010]

[Action]

 According to the stepladder of the present invention configured as described above, one end of the rear column is pivotally supported on the rotary frame rotatably mounted on the top board bar so that the other end moves in the longitudinal direction of the rotary frame. By this, the rear support can be moved in the direction orthogonal to and parallel to the step rail of the ladder support, and the stepladder can be set by avoiding obstacles only by moving the rear support. Further, by forming the opening stopper in a frame shape so as to surround the rear strut and fixing it to the rotating frame via a reinforcing material, movement of the rear strut in a direction parallel to the step rail can be restricted. It is possible to prevent the rear strut from opening too much.

Further, by forming the auxiliary step plate integrally with the opening stop, the number of constituent members can be reduced, and moreover, the auxiliary step plate can be placed on the auxiliary step plate without disturbing the opening stop.

[0012]

【Example】

 Hereinafter, an example of the stepladder of the present invention will be described in detail with reference to the drawings. 1 is a front view of the stepladder of the present invention, FIG. 2 is a side view of the stepladder, and FIG. 3 is a perspective view of a main part of the stepladder.

The stepladder of this invention has a rectangular top board bar 1, a ladder column 2 fixed to one side of the top board bar 1 by welding or the like, and rotatably attached to the other side of the top board bar 1. The rotary frame 3 to be mounted and a channel-shaped bracket 4 fixed to the lower surface of the rotary frame 3 by welding or the like are rotatably supported in the longitudinal direction of the rotary frame 3 via pivot bolts 5. The rear strut 6 and a pair of reinforcing members 7 protruding from the lower ends of both sides of the rotating frame 3 are fixed to the tips of the reinforcing members 7 by welding or the like, and a main portion is constituted by a flat elliptical opening stopper 8 surrounding the rear strut 6. ing. An auxiliary tread 9 is projected on the upper side of the rear strut 6 of the stepladder thus constructed, and one end of the chain 10 whose one end is connected to the substantially middle portion of the ladder strut 2 is optional. This portion is detachably connected to a locking hook 11 which is provided at a substantially middle portion of the rear support column 6 so that the open state of the ladder support column 2 and the rear support column 6 can be arbitrarily adjusted.

In this case, the top board crosspiece 1 has a structure in which a horizontal crosspiece 1b also made of an aluminum alloy is installed on a rectangular frame 1a made of aluminum alloy. The ladder column 2 fixed to one side of the top plate rail 1 connects a reinforcing member 2c to the back side of a pair of aluminum alloy ladder legs 2a facing downwardly in a divergent manner, and also connects the ladder legs 2a. Further, aluminum alloy foot rails 2b fixed to the reinforcing member 2c by welding or the like are installed at appropriate intervals. The surface of the stepping pedestal 2b is provided with an uneven strip (not shown) for preventing slippage. In addition, the lower end of the ladder leg 2a is provided with a claw portion 12 for maintaining stability when it is erected on the ground, and the lower end surface of the stepping beam 2b in the middle portion is used for carrying or stepping folding. Also, the handle 13 used for unfolding is fixed.

The rear strut 6 is made of an aluminum alloy rectangular pipe-shaped upper leg 6a pivotally supported by the rotary frame 3 and an aluminum alloy rectangular pipe-shaped slidably inserted into a lower end portion of the upper leg 6a. The upper leg 6a and the lower leg 6b have a positioning pin 6c penetrating to the lower side of the upper leg 6a, and a positioning pin 6c penetratingly provided to the upper side of the lower leg 6b at appropriate intervals. It can be adjusted to a predetermined length by arbitrarily penetrating a plurality of positioning holes 6d. After this, as shown in FIG. 4, a reinforcing square pipe 14 is inserted and fixed inside the upper leg 6a of the support column 6, and a stainless steel pivot bolt 5 that penetrates the bracket 4 is used. The rear support column 6 can be rotationally moved in the longitudinal direction of the rotary frame 3 with the upper leg 6a and the reinforcing square pipe 14 penetrating. The nut 5a screwed to the protruding end of the pivot bolt 5 is provided with a U-nut with a locking mechanism or a split pin to prevent the nut 5a from loosening.

Further, an auxiliary tread plate 9 is fixed to the upper side of the upper leg 6a by using a reinforcing square pipe 14 by welding or the like. In this case, as shown in FIG. 3, the auxiliary tread plate 9 comprises a circular frame 9a made of aluminum alloy and a stepping beam 9b installed at the center of the circular frame 9a. A part of the circular frame 9a is welded to the upper leg 6a. In addition to being fixed, the lower surface of the circular frame 9a on the front end side is supported by a support bracket 9c fixed to the upper leg 6a. The lower leg 6b is provided at its lower end with a claw portion 12 for maintaining stability when standing upright on the ground like the ladder leg 2a.

On the other hand, the opening stopper 8 is formed by bending an aluminum alloy pipe member into a flat elliptical shape, and is attached to the lower end portion of the aluminum alloy reinforcing member 7 fixed to the lower surface of the rotating frame 3 by welding or the like. The notch 7a provided is fixed by welding or the like with the stopper 8 engaged. In this case, the shape of the opening stopper 8 may be formed by a shape other than a flat ellipse, such as a circular frame or a rectangular frame. However, when working with the foot on the auxiliary step plate 9 located below the opening stopper 8, In order to prevent the opening stopper 8 from getting in the way, it is preferable that the portion facing the outside should not protrude outward as much as possible.

According to the stepladder of the present invention configured as described above, since the rear support column 6 rotates together with the rotating frame 3 rotatably attached to the top plate bar 1, the rear support column 6 is not used. Can be folded to the side of the ladder column 2 for storage and transportation. In addition, at the time of use, the rear strut 6 is spread in a direction orthogonal to the step rail 2b of the ladder strut 2 and held in the chain 10 in a predetermined open state, and the upper leg 6a and the lower portion of the rear strut 6 are also supported. The legs 6b can be adjusted and used for the work. When using, when there are obstacles such as stones and bowls on the ground, avoid the obstacles by moving the rear support 6 in the longitudinal direction of the rotating frame 3, that is, in the direction parallel to the step bar 2b. The stepladder can be set to the standing position. Therefore, the stepladder can be set without moving the stepladder itself. Also, when the rear support column 6 is moved in the longitudinal direction of the rotary frame 3, the rear support column 6 collides with the stopper 8 so that the rear support column 6 does not open more than necessary and should be used in a stable state. You can Moreover, since the rear support column 6 is surrounded by the opening stopper 8 and the opening stopper 8 is connected to the rotary frame 3 through the pair of reinforcing members 7, it is necessary to cover the strength reduction in the pivot portion of the rear support column 6. You can

FIG. 5 is a perspective view showing a main part of another embodiment of the stepladder of the present invention. The stepladder shown in FIG. 5 is a case where the auxiliary step plate 9 is formed integrally with the opening stopper 8 to reduce the number of constituent members. That is, similarly to the first embodiment, the opening stopper 8 formed in a frame shape so as to surround the rear support 6 is bulged outward, and the auxiliary step plate 9 is integrally formed on the tip side. This is a case in which the cross rail 8a is bridged in the middle of the opening stopper 8 to surround the rear support 6. Therefore, according to the stepladder in the second embodiment, since the opening stopper 8 and the auxiliary footboard 9 can be integrally formed, the number of constituent members can be reduced, and the stepladder assembly can be made inexpensive and easy. . In addition, since the opening stopper 8 can be put on the auxiliary tread 9 without disturbing it when used, it is easy and safe to use.

In the embodiment shown in FIG. 5, the case where the opening stopper 8 and the auxiliary step plate 9 are formed by an integral frame body has been described. However, like the first embodiment, the opening stopper formed in a frame shape is used. It is also possible to have a structure in which the auxiliary step plate 9 is integrally projected on the shaft 8 by welding or the like. Since the other parts of the second embodiment are the same as those of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[0021]

[Effect of device]

 As described above, according to the stepladder of this invention, since it is configured as described above, the following effects can be obtained.

1) According to the stepladder of the first aspect, one end of the rear column is pivotally supported on the rotary frame rotatably mounted on the top board bar so that the other end moves in the longitudinal direction of the rotary frame. , The rear strut can be moved in the direction orthogonal to and parallel to the step of the ladder strut, and the stepladder can be set by avoiding obstacles only by moving the rear strut. In addition, since the opening stop is formed in a frame shape to surround the rear strut and is fixed to the rotating frame via a reinforcing material, movement of the rear strut in a direction parallel to the foot rail is restricted to prevent the rear strut from moving. It is possible to prevent it from opening too far, and it is possible to use the stepladder in a stable state with sufficient strength.

2) According to the stepladder of claim 2, since the auxiliary step plate is integrally formed with the opening stop, the number of constituent members can be reduced, and the stepladder can be made inexpensive and easy to assemble. It is easy to use and safe because you can rest your foot on the auxiliary crosspiece without the opening stop obstructing.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a stepladder of the present invention.

FIG. 2 is a side view of a stepladder.

FIG. 3 is a perspective view showing a main part of a stepladder.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of an essential part showing another embodiment of the stepladder of the present invention.

[Explanation of symbols]

 1 Top Board Cross 2 Ladder Post 2a Ladder Leg 2b Foot Step 3 Rotating Frame 4 Bracket 5 Pivoting Bolt 6 Rear Strut 7 Reinforcement 8 Opening Stop 8a Side Rail 9 Auxiliary Step Plate

Claims (2)

[Scope of utility model registration request] 1. A stepladder comprising a ladder support fixed to one side of the top board and laterally extending a plurality of step bars at appropriate intervals, and a rear support attached to the other side of the top board. A rotary frame is rotatably attached to the top rail, and one end of the rear column is pivotally supported on the rotary frame so that the other end moves in the longitudinal direction of the rotary frame, and the movement of the rear column is restricted. A stepladder characterized in that the opening stopper is formed in a frame shape so as to surround the rear column, and is fixed to the rotating frame via a reinforcing material. 2. The stepladder according to claim 1, wherein an auxiliary step plate is integrally formed with the opening stop.