JPH0715879Y2 - Manhole cover plate made of stainless cast iron - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cover plate for a manhole, and more specifically, it is fitted to an annular outer wall raised on a receiving frame and supported by an upper end of an annular inner wall. The present invention relates to a manhole cover plate made of deodorant stainless cast iron, which is composed of a cover plate provided with an annular leg piece vertically fitted in a U-shaped groove formed by an outer wall and an inner wall.

(Prior Art) Conventionally, since the cover plate of the manhole is required to have pressure resistance,
It has been mainly cast from ductile cast iron, etc., but recently the manhole cover plate attached to the building is required to be made beautiful, and it seems that decorative manholes with tiles on the surface are widely used. In addition, a manhole cover plate made of decorative stainless cast iron has been cast and used.

(Problems to be solved by the invention) Manhole cover plates cast from stainless cast iron are generally less corrosive and the matte part has a white silver color, so it is not necessary to apply anticorrosive paint or apply antirust treatment. Although it is not cosmetic, the deodorant lid plate, that is, the closed lid, has a keyhole for opening and closing to prevent the odor from being emitted inside, and a recess is formed on the surface so that the locking rod can be hung over the recess. It is cast so that the central part of the lid plate is slightly higher than the surroundings,
When rainwater or the like collects in the keyhole, it also causes a reddish-brown thin rust, which impairs the white silver appearance of stainless cast iron.

In addition, the pattern formed on the surface also had patterns connected to each other or had a dent, and when a rim was provided at the peripheral portion, rainwater was collected and rusting was unavoidable.

It is an object of the present invention to provide a deodorant type manhole cover plate that is cast from stainless cast iron and that can maintain the white silver-colored beauty peculiar to stainless cast iron without rusting.

(Means for Solving the Problems) In the present invention, when casting a deodorant type manhole cover plate using stainless cast iron, an annular leg-like piece vertically extending from the peripheral edge of the cover plate is used as a peripheral edge of the back surface of the cover plate. It is formed at a position that is slightly inward, and a hand keyhole that penetrates from the surface of the lid plate to the back side is provided in the protruding part of the lid plate outside the leg-like piece, and the pattern formed on the surface of the lid plate is not continuous It is something that can be solved by making the design more raised.

(Embodiment) The present invention will be described according to an embodiment shown in the drawings.

As shown in FIGS. 1 and 2, the receiving frame is made of stainless cast iron so that the upper end surface of the annular outer wall (7) raised on the receiving frame (2) and the surface of the lid plate are substantially flush with each other. 2), the back surface of the lid plate contacts the upper end of the inner wall (8), and the lid plate (1)
Manhole cover plate (1) configured to support
Is an annular leg piece loosely fitted in a U-shaped groove formed by the outer wall (7) and the inner wall (8) of the receiving frame (2) at a position inside the outer peripheral edge of the back surface of the lid plate (1). (3) is vertically installed, and a hand keyhole (4) is formed on the protruding portion (5) outside the leg-like piece (3) from the front surface to the back surface of the lid plate (1), and the lid plate (1) is formed. The pattern (6) formed on the surface of (1) is formed by a pattern floating from the discontinuous surface.

The shape of the hand key hole (4) may be changed according to the shape of the locking portion at the tip of the hand key as shown in FIG. 3 or FIG. The pattern is a pattern that rainwater does not stay and floats out of the surface, but the surface of the pattern is polished to give a gloss, and the recess has as-cast or shot-processed fine irregularities Or vice versa, the recesses may be polished. The letters formed on the surface of the lid plate (1) are also formed so that rainwater does not stay, like the pattern (6), and the floating edging provided on the peripheral edge is not provided.

(Effect of the device) The deodorant type manhole cover plate of the present invention is cast from stainless cast iron, and the hand key hole is provided on the protruding portion outside the leg-shaped piece so that the cover plate surface can penetrate through the back surface. , When the lid plate is fitted to the receiving frame, the through hole of the hand keyhole opens into the groove between the outer wall and the inner wall of the receiving frame, and the odor from inside the manhole contacts the back surface of the lid plate inside the leg piece. The rainwater that was blocked by the inner wall of the receiving frame and was not released from the hand keyhole, and the rainwater that flowed into the handkey hole flowed down into the groove of the receiving frame without staying in the hand keyhole, and the pattern formed on the surface also appeared. As the design is designed to prevent rainwater from accumulating,
It is possible to provide a beautiful white silver-colored lid plate peculiar to stainless cast iron without rusting, and it is not necessary to perform anticorrosion treatment such as tar paint like a lid plate cast from ordinary ductile cast iron. Is.

Further, since it is cast from stainless cast iron, it is useful in that the pattern forming pattern can be processed into a metallic luster portion and a matte white silver portion.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a top view in which a cover plate is fitted to a receiving frame, FIG. 2 is an enlarged sectional view taken along line AA of FIG. 1, and FIGS. [Fig. 3] is a perspective view of a different embodiment showing the shape of a hand keyhole. 1 ... Lid plate, 2 ... Receiving frame, 3 ... Leg-shaped piece, 4 ... Hand key hole, 5 ... Projection part (of lid plate), 6 ... Pattern, 7 ... Outer wall, 8 ... Inner wall.

Claims (1)

[Scope of utility model registration request] 1. A manhole cover plate, which is cast from stainless cast iron, is fitted in an annular outer wall (7) raised on a receiving frame (2), and is supported by the upper end of the inner wall (8). In (1), an annular shape loosely fitted in a U-shaped groove formed by the outer wall (7) and the inner wall (8) of the receiving frame (2) at a position inside the outer peripheral edge of the back surface of the lid plate (1). The leg-like piece (3) of FIG.
In addition to forming a hand keyhole (4) through the cover plate (1) from the front surface to the back surface, the pattern (6) formed on the surface of the cover plate (1) is formed with a pattern floating from the discontinuous surface A manhole cover plate made of stainless cast iron, which is characterized in that