JP2001159285A - Stepladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stepladder allowing a user to conduct work not only at a flat place but also on a slope or a staircase in the same stable installation state as that at the flat place. SOLUTION: This stepladder connected with a pair of ladder formation sections is provided with a folding mechanism 6 between the upper side and the lower side of on ladder formation section 1. The folding mechanism 6 comprises a fitting frame 4 to the upper side of the ladder formation section 1, a support frame 5 rockably journaled to the lower section of the fitting frame 4 and having a support base 9 at the lower end, and a fixing means 10 regulating the rocking motion of the support frame 5 at a fixed position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepladder used for work in a high place, and more particularly to a stepladder installed and used on a slope or a stair floor.

[0002]

2. Description of the Related Art Conventionally, there are various types of stepladders used on such slopes and stairs. For example, a lower end of a ladder forming portion is formed in a semicircular shape. The one that swings the part to the left and right to correspond to the inclination or the step of the stairs, or the one that expands and contracts the lower end of the ladder forming part in multiple steps and responds to the inclination and the step of the stairs like the stepladder was there.

[0003]

However, a stepladder as described above can maintain a stable state during work as long as it is a general stepladder having no means for responding to a slope or a staircase in a flat place. However, when using the stepladder of the above configuration on the originally intended stairs or sloping ground, it is necessary to install the stepladder in a more stable state than in a flat place. The angle of the installation site,
Or because it was to adjust the length, it was point-installed by the support base at the lower end of the stepladder as it was in a flat place,
There was another problem that lacked security.

An object of the present invention is to provide a stepladder which can be used not only in a flat place but also in a sloped place or stairs while maintaining the same installation state as in a flat place.

[0005]

According to one aspect of the present invention, there is provided a stepladder formed by connecting a pair of ladder forming portions, wherein one of the ladder forming portions is connected. A middle folding mechanism is provided between the upper side and the lower side of the section, and the middle folding mechanism is mounted on a ladder forming section upper side, and is pivotally supported by a lower portion of the mounting frame and has a lower end. It is characterized by comprising a support frame having a support base and fixing means for restricting the swing of the support frame at a fixed position.

Here, the height position where the ladder forming portion is provided with the center folding mechanism is such that the installation area on the floor surface at the lower end surface of the center bent supporting frame can secure a space for stably holding the stepladder. However, there is no particular limitation. In addition, the fixing means only needs to be able to fix the mounting frame and the support frame so as not to swing.Specifically, through holes are provided in both the mounting frame and the support frame, and the stopper pins are aligned with the respective through holes. A pin that can be inserted or protruded and retracted by an urging member such as a coil spring, and a through-hole through which the pin can project are provided at corresponding positions of the mounting frame or the support frame, respectively. It may be fixed by a joint relationship. Further, the fixed position means a state in which the mounting frame and the support frame are fixed on a straight line.

When formed in this manner, the support frame is configured to be swingable from the mounting frame according to the situation of the installation place by releasing the fixing means. Can be installed with a large ground contact area on the floor corresponding to the slope of the sloping ground or the steps of the stairs. You can work on a stepladder.

[0010] In the present invention, the mounting frame is provided with a height adjusting means for enabling a multi-stage expansion and contraction from the upper side of the ladder forming portion to the lower side of the ladder forming portion. As the support frame is bent from the mounting frame, it is gradually adjusted upward or downward from the initial mounting point of the support frame, so that it can respond to the slopes of slopes and the steps of stairs in a wider range. And the stepladder can be stably installed in a vertical state.

Here, the height adjusting means is not particularly limited as long as it can raise and lower the height position of the support frame in multiple steps. A plurality of adjustment holes are drilled, while a screw hole is provided on the upper side of the ladder forming part, the screw hole matches one of the adjustment holes, and a thumb screw is screwed into both holes and fixed. And, a plurality of through holes are provided at intervals on both the ladder forming part and the mounting frame, and the respective through holes match,
A pin may be inserted into each hole and fixed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a stepladder according to the present invention is shown in FIG.
This will be described below with reference to FIGS. First, the basic structure of a stepladder will be described with reference to FIGS. 1 and 2. A ladder forming section 1 having a plurality of horizontal members 3 at substantially equal intervals between a pair of vertical members 2, is attached to a front side and a rear side. Each of the ladder forming portions 1 and 1 is provided at its lower end with a support 9 for a floor surface 19 and the top 1 of each ladder forming portion 1 and 1.
1, 11 are rotatably supported. Further, the stepladder of the present invention is configured such that a lower end portion of one of the ladder forming portions 1 among the ladder forming portions 1 and 1 is bendable by a center folding mechanism 6, and further, the lower end portion is formed. The vertical member 2 is attached so that it can be adjusted in multiple stages from the lower side. In this embodiment, in FIG. 2, the left side of the figure is the front side, and the right side of the figure is the back side.

As shown in FIG. 3, the center folding mechanism 6 has a mounting frame 4 with the vertical member 2 whose height can be adjusted from the lower part of the vertical member 2, and a swingable lower end of the mounting frame 4. Support frame 5 for supporting, support frame 5 and mounting frame 4
And a stopper pin 10 for restricting the support frame 5 from oscillating. The support frame 5 is arranged at the lower end of each of the left and right vertical members 2 and 2, although not shown in the drawing.
Moreover, since the lowermost horizontal member 3 is provided between the support frames 5 and 5, when one of the support frames 5 is rotated from the mounting frame 4, each of the vertical members 2 is The left and right support frames 5, 5 are simultaneously bent from the lower end side of the. In addition, the support frame 5 is a vertical member 2
When each of the through holes 1 is provided in both the support frame 5 and the mounting frame 4,
2 and 13 are overlapped and coincide with each other.
By inserting the stopper pin 10 through the support member 3, the support frame 5 is fixed to the vertical member 2 so as not to swing. When bending the support frame 5 from the mounting frame 4,
Each of the through holes 12 and 13 corresponding to the stopper pin 10
From the mounting frame 4
Swings from the lower end side toward the back side with respect to the vertical member 2.

As described above, the support frame 5 does not swing further to the front side of the ladder forming portion 1 with reference to the vertical member 2 because the wall portion 14 is formed on the front side of the support frame 5. When the support frame 5 is at a fixed position with respect to the mounting frame 4, the rear side surface 16 of the wall portion 14 contacts the front side surface 15 of the vertical member 2, and the front side of the ladder forming portion 1 of the support frame 5 is further extended This is because swinging to the side is prevented. In addition, the stopper pin 10 may be lost if it is pulled out during use.
It is desirable that the support frame 5 be attached to an arbitrary position of the stepladder so as not to be detachable.
Not limited to the stopper pin 10 used in the present embodiment, for example, although not shown, a pin that appears and disappears by the urging force of a coil spring is provided on the mounting frame side, and the pin is inserted into a through hole provided on the support frame side. May be configured to engage with each other, and the configuration is not particularly limited.

As shown in FIG. 4, the mounting frame 4 is provided with a plurality of adjusting holes 7 spaced apart from each other in a longitudinal direction. However, a screw hole having the same diameter as the adjusting hole 7 is provided, and a screw 17 is screwed into each of the overlapping holes 7 so that the screw hole and the adjusting hole 7 coincide with each other. It is possible to adjust the height of the lower end of the ladder forming portion 1 from the vertical member 2 in multiple stages.

The support base 9 has a ground contact surface on the lower end surface side when the stepladder is used in a flat place, and the support frame 5
Is pivotally supported at the lower end side of the shaft so as to be able to swing back and forth. This allows
The support frame 5 can flexibly cope with the bending of the support frame 5.
Also, when grounding to 9, it can be lifted up so as not to be in the way.

By forming the stepladder of the present embodiment as described above, the stepladder can be used in the following procedure. For example, when the main stepladder is installed on an inclined ground, first, the stopper pin 10 is removed from the through holes 12 and 13 which coincide with each other, and the support frame 5 can be freely swung from the vertical member 2. Next, the support frame 5 is rocked from the mounting frame 4 to the rear side of the ladder forming portion 1 to be bent, and the bent lower end surface 20 of the support frame 5 in the bent state is grounded toward the floor surface 19 of the sloping ground. ,
Further, the fixed hook 18 attached to the one ladder forming part 1 is hooked on the other ladder forming part 1 while the lower end surface 20 of the support frame 5 which is bent in the middle is kept in contact with the floor 19,
While the distance between the ladder forming parts 1 and 1 is fixed, and the swing angle between the mounting frame 4 and the support frame 5 is gradually changed as needed, the stepladder is vertically adjusted from the floor surface 19 of the sloping ground. I will do it. As a result, as shown in FIG. 5, the stepladder is supported from the floor surface 19 of the sloping ground in a state in which the entire lower end surface 20 of the support frame 5 is grounded, so that the stepladder is installed on an unstable sloping ground. At the same time, the floor 1 of the sloping ground is kept in a state with a more secure feeling than the conventional stepladder.
9 can be installed. The bent lower end surface 20 of the support frame 5 is desirably formed as an uneven surface because it serves as a ground contact surface with the floor surface 19.

Although the stepladder of the present invention can sufficiently secure the work even if the structure is used as it is, for example, when the condition of the sloping ground is a relatively gentle slope that is not enough to bend the support frame 5. Depending on the length of the support frame 5 formed in the height direction, the stepladder can be erected in the vertical state as described above by placing the bent lower end surface 20 of the support frame 5 on the floor surface 19. With the ground screw being grounded, the adjustment hole 7 into which the thumbscrew 10 is screwed is changed to another adjustment hole 7 so as to match the screw hole, and the thumbscrew 17 is screwed into the adjustment hole 7 to form a slope having a gentle slope. However, the support frame 5 can be finely adjusted downward in multiple steps from the initial height position, and the stepladder can be flexibly supported even on a slope having a gentle slope. It can be erected vertically. On the contrary, the floor surface 1 is more than the bent position of the support frame 5.
Even on a steep slope 9, the support frame 5 can be erected vertically sufficiently by making fine adjustments to the upper side. The stepladder of the present invention can be used without problems on floors having steps such as stairs, in addition to the sloped land shown in the above embodiment.

[0017]

According to the present invention, the present invention can be used not only in a flat place but also in a place having a step such as a slope or a stair.
Since the stepladder can be installed on the floor in a much more stable state than conventional stepladders of this type, the work on the stepladder can be performed safely, and it is usually unstable and dangerous on slopes and steps. The work in a place where there is no danger can be performed more safely while maintaining the stability equal to or better than that of a flat place.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a stepladder according to the present invention.

FIG. 2 is a side view showing an embodiment of a stepladder according to the present invention.

FIG. 3 is an enlarged explanatory view of a main part of a stepladder according to the present invention, with a part cut away.

FIG. 4 is an enlarged explanatory view of a main part of the stepladder according to the present invention, which is partially cut away.

FIG. 5 is a side view showing the use of the stepladder of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladder forming part 4 Mounting frame 5 Support frame 6 Center folding mechanism 8 Height adjustment means 9 Support base 10 Fixing means (stopper pin) 19 Floor surface 20 Lower end surface

Claims (2)

[Claims] 1. A stepladder formed by connecting a pair of ladder forming parts, comprising a center folding mechanism (6) between an upper side and a lower side of one of the ladder forming parts (1). The center folding mechanism (6) includes a mounting frame (4) on the upper side of the ladder forming portion (1), a swingably pivotally supported lower portion of the mounting frame (4), and a support base (9) at the lower end. A supporting frame (5) provided and fixing means (10) for restricting swinging of the supporting frame (5) at a fixed position.
A stepladder characterized by consisting of: 2. The mounting frame (4) is provided with a height adjusting means (8) which enables multi-stage expansion and contraction from the upper side of the ladder forming portion (1) to the lower side of the ladder forming portion (1). The stepladder according to claim 1, wherein