JPH0663799U - Scaffolding board stepladder - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] The height of the scaffolding plate can be set to the optimum height that matches the situation at the construction site, and it is safe and sufficient because it does not take time to level it. Get a scaffolding stepladder with strong strength. [Structure] When the upper ends of a pair of ladder mechanisms 10 and 11 are connected via a hinge and the legs are opened, the ladder mechanism step bases 5 and 6 are connected.
One of the pair of ladder mechanisms 10 has a pair of struts 1 and 2, and fitting portions 31 at both ends can be slid on the struts. And a slide step 3 incorporating a locking device capable of locking at a predetermined position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scaffolding board stepladder used to install a scaffolding board at a construction site or the like.

[0002]

[Prior art]

 Conventionally, various scaffolds with different heights have been prepared as scaffolding stepladders in order to install scaffolds with an appropriate height according to the situation at the construction site. Normally, a stepladder for general construction or a stepladder that doubles as a ladder was used to set the height of the scaffolding board by changing the step of applying the scaffolding board. In addition, when the place where the stepladder is placed is high or low, the scaffolding plate is not horizontal, so different types of stepladder were prepared, or paving stones for height adjustment were sometimes used. Therefore, in some cases, a stepladder having legs that can be expanded and contracted as shown in Japanese Utility Model Laid-Open No. 134200/1990 was prepared.

[0003]

[Problems to be solved by the device]

 Conventionally, the stepladder used for scaffolding boards is as described above, and it is difficult to set the optimum scaffolding board height that matches the situation at the construction site due to the large step interval, and it is difficult to set a fine height. When I wanted to adjust, I often had to put up with it. Moreover, it took a lot of time to make the scaffolding plate horizontal, and there was a great risk when using a paving stone. In addition, there is a problem in that the legs that can be expanded and contracted are inconvenient to put in and take out, and in addition, the columns are thick in order to have sufficient strength.

The present invention has been made to solve the above-mentioned problems, and in order to set the height of the scaffold plate to an optimum height that matches the situation of the construction site and to make it horizontal, The aim is to provide a stepladder stepladder that is safe, has sufficient strength, and is labor-saving.

[0005]

Means for Solving the Problems A scaffolding board stepladder according to the present invention is one in which the upper ends of a set of ladder mechanisms are connected via hinges so that the ladder mechanism can be placed upright when the legs are opened. One ladder mechanism of the pair of ladder mechanisms is fitted to the pair of struts and the fitting portions at both ends of the pair of struts so that they can slide, and can be locked at a predetermined position. As described above, the fitting step is provided with a slide step provided with a locking device.

Further, in the above locking device, the locking portion at one end is constantly biased by a spring so as to project into the fitting portion of the slide step and engage with the column, and the grip portion at the other end is made of the slide step. Slide pins that project into the middle portion and that can be disengaged from the support columns by manual operation of the grip portions are internally mounted at both ends of the slide step.

[Action]

 According to the scaffolding board stepladder configured as described above, the height of the scaffolding board can be set to an optimum height that matches the situation of the construction site, even though it is a simple means of manually operating the slide step. Also, scaffolding boards can be installed horizontally without using paving stones. Therefore, it has sufficient strength and is less dangerous.

[0007]

【Example】

 (Embodiment 1) An embodiment will be described with reference to the drawings. In FIG. 1, 10 is one ladder mechanism of a set of ladder mechanisms, and a pair of columns 1 and 2 formed of a circular metal tube. A slide step in which the fitting portions 31 at both ends are fitted so as to be slidable on the columns 1 and 2, respectively, and the fitting device 31 is provided with the locking device 4 so that the fitting portions 31 can be locked at predetermined positions. 3 and auxiliary steps 5 and 6, a cap 7 and the like. The columns 1 and 2 are provided with locking holes 1a and 2a at predetermined intervals.

The locking device 4 is configured as shown in FIG. That is, reference numeral 32 denotes a step portion formed in a rectangular tube shape, and fitting portions 31 for fitting to the columns 1 and 2 are fixed to both ends thereof. The fitting portion 31 is also formed in a rectangular tube shape, but in order to fit the support pillars 1 and 2, the fitting portion 31 is formed in a U shape as shown in FIG. In some cases, it may be formed into a tubular shape. Reference numeral 33 is a bearing bush, and 34 is a U-shaped support fitting, both of which are fixed to the inside of the step portion 32 by means such as welding. 41 is a locking pin, which is formed of a metal rod. Reference numeral 42 denotes a pulling spring, which is suspended between a spring hook metal fitting 43 fixed to the locking pin 41 and a spring hook metal fitting 44 fixed to the fitting portion 31, and a tip portion 41a of the locking pin 41 is fitted to the fitting portion. It is urged to project to the 31st side. When the locking pin 41 projects, the tip 41a is engaged through the locking hole 1a or 2a. The other end of the locking pin 41 is bent to form a grip portion 41b, which is led out to the outside through a long hole 35 opened near the center of the step portion 32. The locking pins 41 are symmetrically provided on both sides of the step portion 32, and both ends of the elongated hole 35 serve as stoppers that define the range in which the locking pin 41 moves.

Reference numeral 11 denotes the other ladder mechanism, the upper end of which is connected to the upper end of the ladder mechanism 10 via a hinge 8. The ladder mechanism 11 is formed so that the ladder mechanism 10 can be placed upright when the training is completed.

When using the scaffolding board stepladder having the above-described configuration, the slide step 3 is locked in advance at an appropriate height, and both ends of the scaffolding board (not shown) are respectively put on the slide steps 3. . In that state, slide slide step 3 to set the height of the scaffolding board to an optimum height that matches the situation at the construction site. That is, by gripping both gripping portions 41b with one hand, the locking pin 41 is pulled in the direction of arrow A, and the engagement with the column is released. When the slide step 3 is slid to an appropriate height while holding the grip portion 41b and the hand is released, the locking pin 41 projects by the force of the pulling spring 42 and engages with the columns 1 and 2 again, and the scaffold plate Is set. If the scaffolding plate does not become horizontal, slide one of the scaffolding plate stepladder slide step 3 to set it horizontally.

Second Embodiment In the first embodiment, the ladder mechanism 10 is provided with one slide step 3, but as shown in FIG. 4, two or three slide steps are provided and used as a normal stepladder. It can also be configured to do so. The ladder mechanism 11 is not limited to the ladder shape, but may be one pillar. The locking device 4 may be ratchet type engaging means.

[0012]

[Effect of device]

 In this invention, as described above, the height of the slide step can be set to the optimum height according to the situation of the construction site by a simple means of only manually operating the locking device. In addition, scaffolding boards can be easily installed horizontally without the need to prepare different types of stepladders or to use paving stones for height adjustment. Further, it has an effect that it can be used as a general stepladder.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view for explaining the locking device of the present invention.

FIG. 3 is an explanatory view for explaining fitting of a step portion of the present invention.

FIG. 4 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 1, 2 Supports 3 Slide step 4 Locking device 5, 6 Auxiliary step 10, 11 Ladder mechanism 31 Fitting part 41 Locking pin 41b Grasping part

Claims (2)

[Scope of utility model registration request] 1. A ladder mechanism in which an upper end of a set of ladder mechanisms is connected via a hinge so that the ladder mechanism can be erected when the legs are opened. , A pair of struts, and slides in which the fitting portions at both ends are fitted to the pair of struts so that they can slide respectively, and a locking device is incorporated in the fitting portions so that the fitting portions can be locked at predetermined positions. A stepladder stepladder characterized by comprising steps and steps. 2. The locking device is urged by a spring so that a tip end of the locking device always projects toward a fitting portion of a slide step and engages with a column, and a gripping portion at the other end projects toward an intermediate portion of the slide step. 2. The scaffolding board according to claim 1, wherein locking pins formed so that the engagement with the supporting column can be released by manual operation of the grip portion are incorporated at both ends of the slide step. stepladder.