JP2003020670A - Locking structure for underground structure lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking structure for an underground structure lid preventing inflow of rainwater and soil into a manhole and surely exhibiting a locking function even when the underground structure lid is arranged on a slope or when turbulence uplift pressure water is generated inside the manhole. SOLUTION: This locking structure for the underground structure lid is constructed of a locking hook 7, which is provided with an engaging projection 7a arranged in the lower part for engaging with a lock seat 2b in a receiving frame 2 and an unlocking projection piece 7d formed on the upper face and journalled freely oscillationally below an opening part 3a in a lid main body 3, a closing plate 8 installed to the locking hook 7 via a resilient member 9 movably downward by pressing force, a guide face 7 arranged in the locking hook 7 for guiding the closing plate 8 so that the closing plate 8 is not brought into contact with an inner circumferential face 2a of the receiving frame 2 when it opens/closes the opening part 3a, and a projection part 8h arranged in the closing plate 8 for sliding a guiding face 7j when the closing plate 8 is pressed and lowered downward. When the lid main body 3 is closed, the engaging projection 7a engages with the lock seat 2b, and the closing plate 8 closes the opening part 3a resiliently.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a locking structure for a lid for an underground structure. The "underground structure lid" referred to in the specification of the present application means a large iron lid, a manhole lid, a sewage basin lid, an electric power, etc. which closes an opening through an underground buried object in a sewer, an underground structural facility, etc. and the ground. An iron lid for a joint groove that can be opened and closed to protect underground facility equipment and underground cables for communication,
Iron cover for power transmission, iron cover for distribution, underground conduit in waterworks and gas pipes, and fire hydrant cover, water control valve cover, sluice valve cover, air valve that functions as an open / close door that connects the ground and its accessory equipment to the ground. The lid, gas pipe lid, water meter lid, etc. are collectively referred to.

[0002]

2. Description of the Related Art Various underground structure lids consist of a receiving frame installed at the upper end of the underground structure and a lid body supported by taper fitting or the like, and the lid body is horizontally swung or vertically. A general structure is that the hinge structure is connected to the receiving frame so that it can be opened and closed by reversing, and a locking structure for locking the lid body and the receiving frame is provided.

As a locking structure for such a lid for an underground structure, there is one in which a lock for locking the receiving frame is attached to the lower surface of the lid main body and can be unlocked by using a bar or the like. For example, there is one described in Japanese Utility Model Publication No. 5-40117. This underground structure lock mechanism
A hook member that engages with the inner protrusion of the frame that receives the lid is pivotally supported on the back surface near the small opening of the lid, and a small lid that closes the small opening is provided at the tip as the hook member. It is configured so as to be axially supported in close proximity to each other, and an extension portion is projectingly provided on the back portion of each of the hook member and the lid opening arm so that the extension portion can come into contact with the lid member during the lid opening operation.

With this structure, when the lid is opened, a small lid provided at the tip of the lid opening arm is pushed down by using a lid opening tool such as a bar so that the extension portion of the lid opening arm extends the hook member. The part can be pushed up to bring the hook member and the inner protrusion of the frame into a non-engaged state (unlocked state).

[0005]

However, in the above-mentioned underground structure locking mechanism, when the small lid is pushed down by the opening tool during the opening operation, the tip end of the small lid supports the opening arm. You will draw a locus of circular motion centered on the axis,
At this time, it is necessary to provide a gap between the tip of the small lid and the inner surface of the frame so that the tip of the small lid does not contact the inner surface of the frame (tapered surface). Therefore, there is a problem that rainwater and earth and sand flow in from this gap, which imposes a load on the sewage treatment. Also, since the hook member is pivotally supported on the back surface of the lid so that it can be engaged with the inner protrusion of the frame only by its own weight, it is disturbed when the lid for underground structure is installed on a slope or in the manhole. There was a problem that the unlocked abruptly when the run-up pressure water was generated.

The present invention has been made in view of the above-mentioned points, and prevents rainwater and earth and sand from flowing into the manhole, and when the lid for the underground structure is installed on a slope or in the manhole, the turbulent flow is lifted. An object of the present invention is to provide a locking structure for a lid for an underground structure that reliably exhibits a locking function even when pressurized water is generated.

[0007]

According to the present invention, an engaging projection for engaging with a lock seat of a receiving frame is formed in a lower portion, an unlocking protrusion is formed on an upper surface, and the engaging projection is rocked below an opening portion of a lid body. A locking hook that is movably pivotally supported, a closing plate that is attached to the locking hook so as to be able to be pushed down through an elastic member and that closes the opening, and the locking hook is provided on the locking hook, and the closing plate is the opening. A guide surface that guides the closing plate so as not to contact the inner peripheral surface of the receiving frame when opening and closing, and a sliding surface that is provided on the closing plate and slides when the closing plate is pressed and descends. And a moving convex portion.

In the above structure, when the lid body is fitted into the receiving frame and the lid is closed, the engaging projection of the locking hook is located at the locking position in the lock seat of the receiving frame and is in the locked state. The closing plate always elastically closes the opening of the lid body by the elastic member. Since the opening of the lid body is always elastically closed by the closing plate, it is possible to prevent rainwater and earth and sand from flowing into the manhole. In addition, it is possible to prevent unexpected unlocking when turbulent pumped water is generated in the manhole or when the lid for the underground structure is installed on the slope.

When the lid is opened, the pressure lower portion formed on the tip end side of the burl is pushed through the opening of the lid body, the closing plate is pushed down, and then the burl is rotated, so that the pressure lower portion is for unlocking the locking hook. The projection is pressed to separate the engaging projection from the lock seat of the receiving frame and unlocked. When opening and closing the closing plate, the convex portion provided on the closing plate is smoothly guided by the guide surface, so that the unlocking operation by the burl becomes easy.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, at least the upper portion of the guide surface is an inclined surface which is inclined downward toward the center of the lid body. With such a structure, the opening and closing of the closing plate is guided more smoothly by the guide surface, and the unlocking operation by the burl is further facilitated.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an underground structure lid to which a locking structure for an underground structure lid according to the present invention (hereinafter, simply referred to as “locking structure”) is applied, and FIG. 2 is a plan view of the locking structure of FIG. 1. 3 is an exploded perspective view of the locking structure shown in FIG. 1 as seen from diagonally above. As shown in FIG. 1, an underground structure lid 1 has a circular shape in a plan view composed of a receiving frame 2 and a lid main body 3 which is mounted on the receiving frame 2 by taper fitting. It is installed so as to be flush with the surface. Lid body 3
Is connected to the receiving frame 2 by the hinge structure 4 provided on one side, and is engaged with the receiving frame 2 by the locking structure 5 provided on the other side to prevent the lid from opening and floating. When the lid body 3 is opened, the locking structure 5 is formed by inserting the pressure lower portion 20a formed at the tip of the burl 20 (FIG. 6) as a tool only for opening the lid into the opening 3a provided on the outer peripheral edge of the lid body 3.
Is unlocked, pulled up above the receiving frame 2 by the burl 20, and horizontally opened or vertically inverted via the hinge structure 4 to open the lid.

The locking structure 5 is attached to the support portion 6 integrally formed on the lower surface of the lid body 3, the lock seat 2b provided on the inner peripheral surface 2a of the receiving frame 2, and the support portion 6 of the lid body 3. It comprises a locking hook 7 that engages with the locking projection 2c of the lock seat 2b.
As shown in FIG. 2, the support portion 6 is integrally formed on the lower surface of the lid main body 3, and one end of each of the side walls 6a and 6b is provided with the opening portion 3.
It is located on both sides of a and is connected to the inner surface of the edge winding portion 3b. Axial holes 6c and 6d are provided on the inner surfaces of the side walls 6a and 6b so as to face each other. The axial hole 6d on one side is open toward the center of the lid body 3, and a bolt hole 6e is provided near the opening. Is provided.

As shown in FIG. 1, the receiving frame 2 has an inner peripheral surface 2a.
A lock seat 2b is recessed at a position corresponding to the locking hook 7 in the lower part of the lock seat 2, and a lock protrusion 2c is provided facing the lower side at an upper opening edge of the lock seat 2b. The locking protrusion 2c is provided on the lid body 3
The engaging projection 7a of the locking hook 7 can be engaged when the lever is pulled up or pushed up by the lifting pressure. Figure 3
Further, as shown in FIG. 4, the locking hook 7 is formed with an engaging projection 7a extending obliquely upward from the lower end in a substantially V shape on the front part (outer peripheral side of the lid body 3), and a weight part 7b on the rear part. It is provided. The engagement protrusion 7a has a shape that is deeply hooked with the locking protrusion 2c provided on the lock seat 2b of the receiving frame 2 and is hard to come off. A pair of unlocking protrusions 7d, 7d are formed on the right and left sides of the front portion of the upper surface 7c so as to be spaced apart from each other. The interval between the protrusions 7d and 7d is set wider than the width of the opening (bar hole) 3a of the lid body 3 as shown in FIG.
It is located on both sides below the opening edge of the opening 3a. Support shafts 7f, 7f are formed to project laterally at the upper ends of both side parts 7e, 7e slightly rearward (center side of the lid body 3) from the projecting pieces 7d, 7d. Upper surface 7c
A circular recess 7g as a spring seat is provided at the center of
A square shaft hole 7h is provided at the center of the shaft hole from the upper surface to the lower surface.

As shown in FIG. 4, the back surface (center side of the lid body 3) of each projecting piece 7d is formed as an inclined surface 7i which is inclined downward from the upper end toward the center side of the lid body 3. A guide surface 7j that is long in the vertical direction is provided on the inner side surface. The guide surface 7j has a shape in which the upper end opens to the upper part of the inclined surface 7i and the lower end opens to the approximate center of the inner side surface of the side part 7e. The inclined surface 7i ′ located above the guide surface 7j of the inclined surface 7i has a function as a guide surface for the convex portion 8h of the closing plate 8 described later. Therefore, the guide surfaces are the inclined surface 7i '(hereinafter referred to as "guide surface 7i'") and the guide surface 7j.
And the upper guide surface 7i ′ is the same as the inclined surface 7i, that is, an inclined surface that inclines downward and obliquely downward from the upper end toward the center side of the lid body 3. These guide surfaces 7i ′ and 7j are such that when the closing plate 8 is pushed down, the tip surface 8c of the closing plate 8 is the inner peripheral surface 2a of the receiving frame 2 (FIG. 2).
Induce it not to touch.

As shown in FIGS. 2 and 3, the closing plate 8 is
This is for closing the opening 3a of the lid main body 3 so that it can be opened and closed, and is wider than the opening 3a, and the front part (outer peripheral side of the lid main body 3) has a slight gap between the left and right protrusions 7d, 7d of the locking hook 7. It is possible to move up and down with a large gap. A closing portion 8b that fits into the opening 3a from below is formed so as to project from the upper surface 8a, a square rod-shaped support shaft 8d is vertically provided substantially at the center of the lower surface, and a projection 8e is provided on the lower end surface. The support shaft 8d is slidably and non-rotatably pierced in a square shaft hole 7h provided in the upper surface 7c of the locking hook 7 with a slight gap. As a result, the closing plate 8 can move up and down with respect to the locking hook 7 without being rotatable. The lower surface of the closing plate 8 has a support shaft 8d.
A flange 8f is concentrically provided around the. Protrusions 8h, 8h are provided on the front portions of both side surfaces 8g, 8g of the closing plate 8, and guide surfaces 7i ', 7j, 7i' of the locking hook 7 are provided.
It is slidable on 7j. These convex portions 8h are
A surface 8h 'from the front surface to the lower surface is a sliding surface with the guide surfaces 7i', 7j (hereinafter referred to as "sliding surface 8h '") and forms a curved surface. As a result, the convex portion 8h has the guide surfaces 7i ′ and 7j.
It becomes possible to slide smoothly on the top.

The support shaft 8d of the closing plate 8 has a coil spring 9 as an elastic member and a boot 1 for dustproofing and waterproofing.
It is penetrated through the shaft hole 7h of the locking hook 7 through 0, the stopper (washer) 11 is fitted to the protrusion 8e at the lower end and fixed by caulking, and is mounted slidably in the vertical direction. The coil spring 9 is contracted between the concave portion 7g and the lower surface of the closing plate 8, and the upper end of the boot 10 is fitted to the flange 8f protruding from the lower surface of the closing plate 8 and the lower end is fitted to the concave portion 7g of the locking hook 7. Are combined. In this way, the closing plate 8 is attached to the locking hook 7. The elastic member is not limited to the coil spring, and other members such as a rubber member and sponge rubber may be used.

As shown in FIG. 2, in the locking hook 7, the closing portion 8b of the closing plate 8 is fitted into the opening 3a of the lid main body 3 from below, and the edge portion of the upper surface 8a is the opening 3a of the lid main body 3. The support shafts 7f and 7f are in contact with the lower surface of the opening edge and the spring 9 is compressed, so that the support shafts 7f and 7f form the shaft holes 6 in the side walls 6a and 6b of the support portion 6.
It is pivotally supported by c and 6d. At this time, since the shaft hole 6d on one side is notched, the support shaft 7f can be attached. Then, the bolt 15 is inserted into the bolt hole 6e of the side wall 6b and the nut 16 is screwed to prevent the support shaft 7f pivotally supported by the shaft hole 6d from deviating. In this way, the locking hook 7 and the closing plate 8 are attached to the lid body 3.

The operation will be described below. As shown in FIGS. 1 and 5, when the lid body 3 is fitted to the receiving frame 2, the locking hook 7 of the locking structure 5 hangs down by the weight portion 7b and is urged to the locking position by its own weight. In the locking position, the locking hook 7 is located below the locking projection 2c with the engaging projection 7a entering the lock seat 2b of the receiving frame 2. In this state, the closing plate 8 is pushed up by the spring force of the spring 9 so that the edge portion of the upper surface 8a is in pressure contact with the lower surface of the opening edge of the opening portion 3a, the closing portion 8b is fitted into the opening portion 3a, and the tip surface thereof is 8 c is in contact with the inner peripheral surface 2 a of the receiving frame 2. As a result, the opening 3a is closed by the closing plate 8. Further, the locking hook 7 is held in the locking position by being urged to the locking position by the spring force of the coil spring 9 in addition to the above-mentioned urging by the own weight, and the play is suppressed.

In this closed state, when the lid body 3 is pulled up by a person other than the operator to open the lid, or when the lifted pressure from the inside of the manhole is applied to the lid body 3, The engaging projection 7a of the locking hook 7 engages with the locking projection 2c of the receiving frame 2 to prevent upward movement. This prevents the lid body 3 from opening. Since the opening 3a of the lid main body 3 is always elastically closed by the closing plate 8, it is possible to prevent rainwater and earth and sand from flowing into the manhole. Further, since the lock hook 7 is held in the lock position with the play being suppressed by the spring force of the coil spring 9, when the turbulent pumped water is generated in the manhole or when the cover for the underground structure is sloped. Unintentional unlocking when installed in

When the lid body 3 is opened, a dedicated burl 20 is used as shown in FIG. This bar 20
As described above, the pressing portion 20a at the tip has a substantially T shape,
The root portion is formed to be inclined with respect to the shaft portion 20b (Fig. 8). The operator inserts the pressure lowering portion 20a of the burl 20 into the opening 3a of the lid body 3 as shown in FIG. 7, and pushes down the closing portion 8b of the closing plate 8 against the spring force of the coil spring 9 at the lower surface thereof. . When the closing plate 8 is pushed down, the protrusions 8h, 8h on both side surfaces slide on the guide surfaces 7i ', 7j, 7i', 7j of the locking hook 7 accordingly, and the protrusions 7d, 7d of the locking hook 7 are pushed. It smoothly moves downward between. Guide surface 7
i ′ and 7j are formed in such a direction that the tip surface 8c of the closing plate 8 is guided away from the inner peripheral surface 2a of the receiving frame 2 toward the center of the lid body 3 when the closing plate 8 is pushed down. The plate 8 moves downward with a slight gap, without the front end surface 8c contacting the inner peripheral surface 2a of the receiving frame 2.
Then, as shown by the chain double-dashed line in FIG. 2, the bar 20 is rotated 90 ° so that the pressure lower part 20a straddles the opening 3a,
As shown in FIG. 8, the upper surface 20c of the pressure reducing member 20a is provided with the opening 3
It is brought into contact with the lower surface of the opening edge of a. In this state, the side surface 20d on one side of the pressure lower portion 20a has the protrusions 7d, 7d of the locking hook 7.
Abutting on the inclined surfaces 7i, 7i.

Next, when the worker pulls the burl 20 in the direction of the arrow A, the upper surface 20c of the pressure lower portion 20a is opened by the opening 3.
The side surface 20d is in contact with the lower surface of the opening edge of a, and the side surface 20d has a protruding piece 7.
Sliding on the inclined surfaces 7i, 7i of d, 7d, a downward force is applied to the locking hook 7 accordingly, and the supporting shafts 7f, 7f
(FIG. 2) is rotated in the direction of arrow C with the fulcrum as a fulcrum, and as shown in FIG.
Is unlocked. Opening and closing of the closing plate 8 is performed by the guide surfaces 7i 'and 7j.
(Fig. 4) The guide is smoothly guided, and the unlocking operation by the burl 20 becomes easy. Next, when the worker pulls up the burl 20 in the direction of arrow B, the lid body 3 is lifted and the lid is opened.

When the lid main body 3 is closed, the locking hook 7 is left in a free state, and when the lid main body 3 is placed on the receiving frame 2 as it is, the locking hook 7 has a weight portion 7b centered on the support shaft 7f.
Is rotated by the action of the position of the center of gravity and locked in the locked position. In addition, the closing plate 8 is pushed up by the spring force of the coil spring 9 so that the closing portion 8b has the opening 3a of the lid body 3.
The front end surface 8c abuts the inner peripheral surface 2a of the receiving frame 2 to close the opening 3a.

Further, as shown in FIG. 5, when the lid main body 3 is closed, the closing plate 8 is closed by inserting a tool other than the burl 20 as a tool for opening the lid into the opening 3a. For example, when the vicinity of the tip of the portion 8b is pressed, as shown in FIG. 10, the closing plate 8 has two points with the rear end 8a 'of the upper surface 8a pressed against the lower surface of the edge of the opening 3a as a fulcrum. It rotates in the direction of arrow D as shown by the chain line. As a result, the locking hook 7 may rotate in the same direction, and in some cases, the engaging projection 7a may be separated from the hook seat 2b to unlock the locking structure 5.

The blocking plate 8 is a convex portion 8 provided on both side surfaces.
h, 8h sliding surfaces 8h ', 8h' are projections 7d of the locking hook 7,
While smoothly sliding on the guide surfaces 7i ', 7j, 7i', 7j of 7d, they rotate integrally with the locking hook 7. As described above, these guide surfaces 7i ′ and 7j are arranged such that when the closing plate 8 is pushed down, the tip surface 8c of the closing plate 8 is separated from the inner peripheral surface 2a of the receiving frame 2 toward the center of the lid body 3. The closing plate 8 is formed so as to be guided,
The tip surface 8c can rotate without contacting the inner peripheral surface 2a of the receiving frame 2. As a result, when the pressing force is released, the closing plate 8 is rotated in the direction of arrow E by the spring force of the coil spring 9 with the rear end 8a 'of the upper surface 8a as a fulcrum to smoothly return to the closed state, and is locked. The structure 5 returns to the locked state.

[0025]

As described above, according to the first aspect of the invention, the opening of the lid body is always elastically closed by the closing plate, so that rainwater and earth and sand can be prevented from flowing into the manhole. In addition, it is possible to prevent unintentional unlocking when turbulent pumped water is generated in the manhole or when the underground structure lid is installed on a slope. In addition, the opening and closing of the closing plate is smoothly guided by the guide surface, which facilitates the unlocking operation by the burl.

According to the second aspect of the present invention, the opening and closing of the closing plate is guided more smoothly by the guide surface, so that the unlocking operation by the burl becomes easier.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an underground structure lid to which a locking structure for an underground structure lid according to the present invention is applied.

FIG. 2 is a plan view of the locking structure shown in FIG.

FIG. 3 is an exploded perspective view of the locking structure shown in FIG. 1 as seen from diagonally above.

FIG. 4 is a perspective view of the locking hook shown in FIG. 3 viewed from the back side.

FIG. 5 is a cross-sectional view showing a state where the locking structure shown in FIG. 3 is assembled and attached to the lid body.

FIG. 6 is an explanatory diagram when starting unlocking of the locking structure shown in FIG. 5.

7 is an explanatory view of an operation of pushing down the closing plate of the locking structure shown in FIG.

8 is an explanatory diagram of a case of shifting to an unlocking operation after pushing down the closing plate of the locking structure shown in FIG. 7. FIG.

FIG. 9 is an explanatory diagram showing an end state of an unlocking operation of the locking structure shown in FIG.

10 is an explanatory diagram showing an example of a locus when the closing plate is pushed down in the locking structure shown in FIG.

[Explanation of symbols]

1 Underground structure lid 2 receiving frame 2a Inner surface 2b lock seat 2c Locking protrusion 3 Lid body 3a opening 3b Edge winding part 4 Hinge structure 5 Locking structure 6 Support 7 Locking hook 7a Engagement protrusion 7b Weight part 7c upper surface 7d protrusion 7f support shaft 7g shaft hole 7i slope 7i 'Guide surface (slope) 7j Guideway 8 Block 8b blockage 8h convex part 9 Coil spring (elastic member) 10 boots 20 bar 20a pressure lower part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Kawada             5-8-18 Kenkasu, Hakata-ku, Fukuoka City, Fukuoka Prefecture             Hinode Water Supply Equipment Co., Ltd. (72) Inventor Yuji Imoto             5-8-18 Kenkasu, Hakata-ku, Fukuoka City, Fukuoka Prefecture             Hinode Water Supply Equipment Co., Ltd. F term (reference) 2D047 BB02

Claims (2)

[Claims] 1. A locking mechanism in which an engaging projection for engaging with a lock seat of a receiving frame is formed in a lower portion, a protruding piece for unlocking is formed in an upper surface, and which is pivotally supported below an opening portion of a lid main body. A hook, a lock plate attached to the locking hook so as to be able to be pushed down via an elastic member, and a closing plate that closes the opening, and the locking hook is provided, the closing plate of the receiving frame when opening and closing the opening. A guide surface that guides the closing plate so as not to contact the inner peripheral surface, and a convex portion that is provided on the closing plate and slides on the guide surface when the closing plate is pressed and descends A locking structure for a lid for an underground structure, which is characterized in that 2. The locking structure for a lid for an underground structure according to claim 1, wherein at least an upper portion of the guide surface is an inclined surface which is inclined downward toward a center side of the lid body.