JPH052686Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a manhole frame with a ladder, and is intended to assist in entering and exiting the manhole.

BACKGROUND ART There are known conventional manhole frames with ladders.

Problems to be solved by the invention There was a problem in that the conventional manhole frame with a ladder tended to have a complicated structure.

Means for Solving the Problems The purpose of the present invention is to devise a ladder that has excellent functionality even though it is easy to remove the ladder, and the gist is that the manhole frame W
A pair of support portions 2, 2 provided on the side circumferential surface 1a of the inner hole portion 1 are provided to support the ladder H so that it can be raised and removed.
and a pair of supporting pieces 4, 4 provided to support the tips 3, 3 of the ladder H protrude.Meanwhile, at the bottom of the ladder H, a first lower horizontal bar 5a for rotating the ladder H and a first lower horizontal bar 5a for rotating the ladder H are provided. A second lower horizontal bar 5b for standing up the second lower horizontal bar 5b is installed vertically and laterally, and the first lower horizontal bar 5a enters and exits the middle part of the first engaging hole 6, 6 below the supporting parts 2, 2. Horizontal guide grooves 6a, 6a are formed so as to be transparent, and second engaging holes 7, 7 above the first engaging holes 6, 6 have vertical openings 7a through which the second lower horizontal bar 5b enters and exits. , 7a.

Operation When the lid (not shown) of the manhole frame W in which the present invention is implemented is opened, the inner hole 1 of the manhole frame W is opened as shown in FIG. At this time, the first lower horizontal bar 5a of the ladder H is engaged with the first engagement holes 6, 6, and the tip end 3 is engaged with the support pieces 4, 4.
It is supported horizontally.

Next, when the ladder H is erected as shown by the solid line in the figure, the first lower horizontal bar 5a and the second lower horizontal bar 5b of the ladder H are supported by the first engaging hole 6 and the second engaging hole 7. Therefore, by using this ladder H, a worker can be safely introduced into the manhole.

Furthermore, the function of the horizontal guide groove 6a will be explained using Figure 2. In this case, the ladder H can be rotated counterclockwise as shown in the figure and lowered to disengage the first lower horizontal bar 5a from the horizontal guide groove 6a, thereby allowing the ladder H to be removed from the manhole frame W.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1.The main part thereof is that a ladder H can be raised and removed from the side circumferential surface 1a of the inner hole 1 of the manhole frame W. A pair of support parts 2, 2 provided for supporting the ladder H and a pair of support pieces 4, 4 provided for supporting the top end portions 3, 3 of the ladder H protrude, while the lower part of the ladder H protrudes. A first lower horizontal bar 5a for rotating and a second lower horizontal bar 5b for raising the ladder H are horizontally arranged vertically, and the first engaging holes 6, 6 below the support parts 2, 2 are arranged horizontally. Horizontal guide grooves 6a, 6a are provided in the intermediate portion so that the first lower horizontal bar 5a can enter and exit, and second engaging holes 7, 7 above the first engagement holes 6, 6 are provided with the second engagement holes 7, 7. Vertical openings 7a, 7a are provided so that the lower horizontal bar 5b can enter and exit.

Next, specific examples of each member will be explained. The manhole frame W is formed with a circular cross section together with the inner hole 1, and the pair of supporting parts 2, 2 protrude vertically from the inner hole 1. Vertically elongated first and second engagement holes 6 and 7 are provided vertically, and a horizontal guide groove 6a is provided in the middle of the first engagement hole 6 for inserting and exiting the first lower horizontal bar 5a. At the same time, a vertical opening 7a is provided at the upper part of the second engagement hole 7 for allowing the second lower horizontal bar 5b to enter and exit.

Further, the pair of support pieces 4, 4 are connected to the support portions 2, 2.
It protrudes horizontally from the inner hole 1 at a position opposite to the inner hole 1, and can horizontally support the tip 3 of the ladder H.

Next, with reference to FIG. 2, a case will be described in which the ladder H in a horizontal state is erected. In this case, lift the first lower horizontal bar 5a of the ladder H to the upper part of the first engagement hole 6, and then rotate the ladder H clockwise in the figure to open the second horizontal bar 5a.
The lower horizontal bar 5b is inserted into the second engagement hole 7 from the vertical opening groove 7a.
When the ladder H is introduced into the interior and lowered together with the first lower horizontal bar 5a, the upright state of the ladder H is maintained.

Effects of the invention Now, the gist of the invention is the configuration described in the claims of the utility model registration, and in particular, the intermediate part of the first engagement hole 6 for engaging the first lower horizontal bar 5a is The structure in which the horizontal guide groove 6a that can enter and exit the first lower side 5a is provided makes it easy to replace the ladder H.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view showing the operating state of the present invention, and FIG. 2 is an enlarged side sectional view of the support portion. W is the manhole frame, H is the ladder, 1 is the inner hole,
2 is a support part, 3 is a tip part, 4 is a support part, 5a is a first lower horizontal bar, 5b is a second lower horizontal bar, 6 is a first engagement hole, 6a is a horizontal guide groove, 7 is a second engagement The matching hole and 7a are vertical openings.

Claims (1)

[Scope of utility model registration request] On the side circumferential surface 1a of the inner hole 1 of the manhole frame W, there are a pair of support parts 2, 2 provided to support the ladder H so that it can be raised and removed, and a tip part 3 of the ladder H.
A pair of support pieces 4, 4 provided for supporting the ladder H protrude, while a first lower horizontal bar 5a for rotating the ladder H and a second lower horizontal bar 5a for raising the ladder H are provided at the lower part of the ladder H. The lower horizontal bars 5b are horizontally arranged vertically, and a horizontal guide groove 6a is provided in the intermediate part of the first engagement holes 6, 6 below the support parts 2, 2 so that the first lower horizontal bar 5a can enter and exit. , 6a are opened, and the second lower horizontal bar 5b is provided in the second engagement holes 7, 7 above the first engagement holes 6, 6.
A manhole frame body with a ladder, characterized in that it has a configuration in which vertical openings 7a, 7a are opened so that people can enter and exit.