JPH0422538U

JPH0422538U -

Info

Publication number: JPH0422538U
Application number: JP6180890U
Authority: JP
Priority date: 1990-06-11
Filing date: 1990-06-11
Publication date: 1992-02-25

Description

[Brief explanation of the drawing]

第１図はこの考案のマンホール開口部の閉塞構
造の一実施例を示し施錠部の断面図を含む第４図
のＡ−Ａ方向から見た拡大断面図、第２図は同実
施例のマンホール開口部の閉塞構造を示し第４図
のＢ−Ｂ方向から見た拡大断面図、第３図は同実
施例の施錠部の拡大底面図、第４図は同実施例の
鉄蓋及び受枠の部分切欠平面図、第５図は従来の
マンホール開口部の閉塞構造を示す断面図、第６
図ａは第５図に示す施錠装置に使用する鍵の正面
図、ｂはａのＣ−Ｃ断面図である。１８……受枠、１９……鉄蓋、２０……施錠部
、２１……内蓋、２２……窓、２３……窓蓋、２
４……開口部、２５……受枠のテーパ内周面、２
８……受枠の環状の突部、３２……鉄蓋のテーパ
外周面、３６……突縁、３７……旋回部材、４３
……係合部。 Fig. 1 shows an embodiment of the manhole opening closing structure of this invention, and is an enlarged sectional view taken from the direction A-A in Fig. 4 including a sectional view of the locking part, and Fig. 2 shows the manhole of the same embodiment. Fig. 4 is an enlarged sectional view showing the closing structure of the opening seen from the direction B-B in Fig. 4, Fig. 3 is an enlarged bottom view of the locking part of the same embodiment, and Fig. 4 is an enlarged view of the iron lid and receiving frame of the same embodiment. A partially cutaway plan view, Fig. 5 is a sectional view showing a conventional manhole opening closing structure, and Fig. 6 is a partially cutaway plan view.
Figure a is a front view of a key used in the locking device shown in Figure 5, and figure b is a sectional view taken along line C--C in figure a. 18... Receiving frame, 19... Iron lid, 20... Locking part, 21... Inner lid, 22... Window, 23... Window cover, 2
4...Opening portion, 25...Tapered inner circumferential surface of receiving frame, 2
8... Annular protrusion of receiving frame, 32... Tapered outer peripheral surface of iron lid, 36... Projection, 37... Rotating member, 43
...Engagement part.

Claims

[Scope of utility model registration request]

A receiving frame having an annular protrusion forming an opening, the upper part of the opening having a tapered inner circumferential surface expanding upward, and the lower part of the opening protruding inward, and the upper part of the opening being able to be opened and closed. an iron lid having a tapered outer circumferential surface that is in close contact with the tapered inner circumferential surface of the receiving frame in the closed state and having no through hole penetrating from the front surface to the back surface; Close to the side, it is supported at a suitable position on the back surface of the iron lid so as to be able to pivot around an axis substantially perpendicular to the surface of the iron lid, and as a result of the rotation, the iron lid is positioned below the projecting edge. a locking portion including a pivoting member having an engaging portion that can take a locking position for restraining the opening direction and an unlocking position for disengaging from the lower side of the projecting edge and allowing the iron cover to be opened and closed; an inner cover that can open and close the lower part of the opening formed by the annular protrusion and water-tightly seals the opening in the closed state; and a window provided in the inner cover at a position near the rotating member. and a window cover that can open and close the window and watertightly seal the window in the closed state.