JPS583888Y2 - Hole opening/closing structure for lids for steeply sloped underground structures - Google Patents

Description

[Detailed description of the invention] This invention is a through-hole such as a crow hole drilled at the peripheral edge of a lid for an underground structure used for applications such as manholes for water supply and sewage, electric power telephone communication, and underground gas equipment. It relates to a hole opening/closing structure that maintains the hole closed at all times and opens only when necessary.

Conventionally, crow holes, keyholes, etc. in covers for underground structures are left open, and as a result, water, mud, etc. can fall through the holes and into the manholes and underground structures, causing water to rise and contaminate the insides of the manholes and underground structures. This may cause problems such as causing the underground structures to lose their functions or putting a strain on their processing capacity, causing harmful gases in the underground structures to accumulate inside them, and causing bad odors to emanate from the holes in the lids. It was occurring.

The present invention eliminates these drawbacks and provides a structure suitable for opening and closing holes provided at the peripheral edge of a so-called steep-slope type lid, in which the lid is supported only by a steeply sloped fitting surface on the receiving frame. That is.

The present invention will be explained based on the attached drawings.

Fig. 1 shows the hole opening/closing structure of the present invention in a vertical section of the lid, Fig. 2 shows an example of the valve mechanism used in the invention, and Fig. 3 shows the hole opening/closing structure of the invention in the lid. 4 and 5 show other examples of the hole opening mechanism of the present invention. FIG.

In FIG. 1, a lid 1 for an underground structure is fitted and supported on the inclined inner circumferential surface of a receiving frame 8. As shown in FIG.

Reference numeral 2 denotes a lid opening crowbar insertion hole provided in a part of the outer periphery of the lid 1.

As shown in FIGS. 2 and 3, the valve mechanism has a valve plate 3 at one end that matches the shape of the crowbar insertion hole 2 of the lid 1.
At the other end, there is provided an arm 4 which normally keeps the valve plate 3 and hole 2 closed and has a balance weight 6 as a mechanism for automatically returning the operating fluid valve plate 3 to the hole 2. It can be formed integrally with the rotating shaft 5.

The rotating shaft 5 of this valve mechanism is moved in the direction of the arrow so that the tip of the valve plate 3 is pushed down along the inner peripheral surface of the receiving frame 8 by pressing the opening crowbar from above the valve plate 3. A rotating shaft sliding groove 7 for this purpose is provided in the radial direction on the back surface of the lid.

As a result, the valve plate 3 is smoothly pushed downward along the steeply sloped inner circumferential surface of the receiving frame 8.

In order to prevent excessive movement of the rotating shaft 5 and ensure automatic return of the valve plate 3 after operation by the balance weight 6, a sliding groove 7 is provided.
A stopper for stopping the movement of the rotating shaft 5 is provided in a recess provided at the back of the rotary shaft 5 .

Furthermore, the sliding groove 7 of the rotary shaft 5 is designed so that the rotary shaft 5 can automatically return to its original position by the action of the balance weight 6 when the lid is closed again after the opening operation using the crowbar is completed.
A descending slope is formed toward the outer periphery of the lid.

Although the hole opening/closing structure according to the present invention is a valve mechanism that uses an arm rotating shaft, it has the following characteristics: By providing the movement groove 7 of the rotating shaft 5, the movement locus of the valve plate 3 provided at the tip of the arm does not need to be a circular locus.

Therefore, it can be suitably used for opening and closing a steep slope receiving type lid that has a crowbar insertion 7L2 provided on the peripheral edge of the lid, and the rotary valve mechanism with a simple structure can be used as is, and the hole can be opened and closed reliably. This has the effect that the following can be expected.

4 and 5 show other embodiments of the invention.

In FIG. 4, instead of the balance weight 6 shown in FIG. 2, a spring 10 is provided in the moving groove 7 using the moving groove 7 of the rotating shaft 5.
An example in which the spring 10 is used as a mechanism for returning the valve plate 3 is shown.

This eliminates the need for a space for the balance weight 6, increasing the degree of freedom in designing the lid and the receiving frame.

Further, FIG. 5 shows an example in which a hook 11 for preventing the lid 1 from floating is used instead of the balance weight.

As a result, the hook 11 is securely locked to the locking protrusion 12 of the receiving frame 8, and the valve mechanism itself can be used for multiple purposes, not just as an opening/closing mechanism for the crowbar insertion hole 2 of the lid. be.

[Brief explanation of drawings]

1 to 3 show an embodiment of the structure for opening and closing the crowbar insertion hole of the lid of the present invention, and show an example in which a balance weight is used as a return mechanism for the valve plate. FIGS. 4 and 5 each show another embodiment of the invention. 1: Lid, 2: Burl insertion hole, 3: Valve plate, 4: Arm, 5
: Rotating shaft, 6: Balance weight, 7: Sliding groove, 8: Receiving frame.

Claims (1)

[Scope of utility model registration request] A valve mechanism consisting of a rotary shaft 5 and a return mechanism for the valve plate 3 of an arm 4 extending from the rotary shaft 5 and having a valve plate 3 at its tip for opening and closing the crowbar insertion hole 2 of the lid 1 is provided on the underside of the lid. established,
Further, the rotary shaft sliding groove 7 for slidingly moving the rotary shaft 5 toward the center of the lid is formed at a downward slope with respect to the circumferential direction of the lid. Hole opening/closing structure of the lid.