JP2538570Y2 - Manhole folding screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a manhole folding screen which is placed around a doorway during construction in a manhole to avoid danger on traffic.

[Prior Art] Conventionally, as a folding screen for a manhole of this type, a metal frame framed in a square shape and covered with a waterproof cloth or a vinyl sheet or the like is combined with four or six sheets to form a manhole entrance. There was a structure surrounding the periphery in a square or hexagon.

[Problems to be Solved by the Invention] However, since the above-mentioned conventional folding screen for manholes is square, it is not only blown off by receiving the side wind properly, but also not only when the finger is folded, but also when it is transported. There was a problem that it was hard to hold.

In addition, even if a vinyl sheet is hung on rainy days, there is another problem that rainwater accumulates in the center and drainage is difficult.

The present invention has been made in order to solve the above-mentioned conventional problems, and the object thereof is to be lightweight, have high structural strength, and to be able to be stably set even in a cross wind.
Another object of the present invention is to provide a folding screen for manholes that can be easily stored and transported and does not collect rainwater.

[Means for Solving the Problems] The manhole folding screen according to the present invention includes a vertical circular frame, a plurality of connecting frames foldably provided between the circular frames, and a cylindrical shape between the vertical circular frames. The ends of the connecting frame are rotatably connected to the upper and lower circular frames, respectively, and by releasing the locking means, the middle of the connecting frame is positioned inside the circular frame. It is characterized by being configured to bend.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numerals 1 and 2 denote an upper circular frame and a lower circular frame, respectively, having a size, that is, a diameter sufficient to surround the entrance of the manhole.

Reference numeral 3 denotes a connecting frame, the both ends of which are rotatably connected to the upper and lower circular frames 1 and 2. As is clear from FIG. 2 (A), these connecting frames 3
Is provided with a hinge 3a in the middle, and when the lock ring 3b is removed in the direction of the arrow, it is bent inward as shown in FIG. 2 (B).

In this embodiment, four connecting frames 3 are provided, the upper circular frame 1 is held so as to be slightly inclined, and the circular frame 1 is balanced so as to avoid the uppermost and lowermost positions of the inclined circular frame 1. It is preferable to arrange them well. The locking method, the number and the arrangement of the connecting frames 3 are not limited to those described above.

Reference numeral 4 denotes a cover, which is tubularly stretched between the upper and lower circular frames 1 and 2, and is slidable on the connecting frame 3 by a fastening piece 4a as shown in FIG. 2 (A). It is fixed to. The cover 4 is made of a waterproof cloth, a vinyl sheet, or the like, and has black and yellow stripes drawn on its outer surface so as to be conspicuous from a distance.

An entrance 4b is opened in the cover 4, and the lid 4c is closed by a fastener as appropriate. Also,
The cover 4 is also provided with a wind tube mounting port (not shown). The lower edge of the cover 4 has a flare shape.

Since the manhole folding screen according to the present embodiment is configured as described above, when this is used, the lower circular frame 2 is located around the entrance of the manhole similarly to the conventional manhole folding screen. And set the air duct as necessary, and open and close the entrance 4b in the cover 4.
To work in and out of the manhole. If it rains during the work, a vinyl sheet or the like is hung on the upper circular frame 1. In this case, since the upper circular frame 1 is inclined, there is no need to worry about accumulation of rainwater.

When the work is completed, the lock ring 3b is removed in the direction of the arrow as shown in FIG. 2 (A), and the connecting frame 3 is connected to the upper and lower circular frames 1 as shown in FIG. 2 (B). The upper and lower circular frames 1 and 2 are attracted to each other and the cover 4 is manually dragged to be folded compactly as shown in FIG.

[Effect of the Invention] The manhole folding screen of the present invention is configured so that the connecting frame is bent inside the circular frame.
Even in the folded state, there are no obstacles on the outside of the circular frame, and as a result, there is no risk of the surrounding objects being caught or hitting the human body during transportation and storage, and safe and smooth transportation And there is an advantage that can be stored.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a manhole folding screen according to the present invention, FIG. 2 (A) is an explanatory view showing the structure of the connecting frame, and FIG. 2 (B) is a connecting frame. FIG. 3 is an explanatory view showing a folding operation, and FIG. 3 is an explanatory view showing an entire folded state. 1,2 ... circular frame, 3 ... connecting frame, 3a ... send part, 3b ... lock ring, 4 ... cover, 4a ... fastening piece, 4b ... doorway, 4c ... lid.

Claims (1)

(57) [Scope of request for utility model registration] 1. Upper and lower circular frames (1) and (2), a plurality of connecting frames (3) foldably provided between the circular frames (1) and (2), and the upper and lower circular frames (1) and (2). Cover (4) stretched between 1 and (2)
And both ends of the connecting frame (3) are rotatably connected to the upper and lower circular frames (1) and (2), respectively, and the locking means (3b) is released to release the connecting frame (3). The middle of 3) is a circular frame (1)
(2) A folding screen for manholes, which is configured to bend inside.