JP3616920B2 - Locking structure for lids for underground structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a locking structure for a lid for an underground structure.
As used herein, “underground structure lid” refers to a large iron lid, a manhole lid, a sewage culm lid, an electric / Openable and closable joint gutter lids, power transmission iron lids, power distribution iron lids, buried underground pipes in waterworks and gas pipes, and their associated equipment to protect underground facilities equipment and underground cables in communications A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, etc., that function as an open / close door.
[0002]
[Prior art]
Various types of underground structure lids are composed of a receiving frame installed at the upper end of the underground structure and a lid body supported by taper fitting or the like so that the lid body can be opened and closed by horizontal turning or vertical inversion. In addition, it is a general configuration that is connected to the receiving frame by a hinge structure and is provided with a locking structure for locking the lid body and the receiving frame.
[0003]
As an example of such a locking structure for a lid for underground structures, there is a lock for locking to a receiving frame attached to the lower surface of the lid body, which can be unlocked using a bar or the like. For example, there is one described in Japanese Utility Model Publication No. 5-40117. In this underground structure locking mechanism, a hook member that engages with the inner protrusion of the frame body that receives the lid body is pivotally supported on the back surface near the small opening of the lid body, and the small lid that closes the small opening is used as a tip. The provided opening arm is pivotally supported in the vicinity of the eaves member, and an extension is provided so as to protrude from the back of each of the eaves member and the opening arm so as to be able to come into contact with the opening operation.
[0004]
With such a configuration, when opening the lid, the extension portion of the lid opening arm pushes up the extension portion of the eaves member by pushing down the small lid provided at the tip of the opening arm using an opening tool such as a bar. Thus, the flange member and the inner protrusion of the frame can be brought into a non-engaged state (unlocked state).
[0005]
[Problems to be solved by the invention]
However, in the above-described locking mechanism for underground structures, when the lid is pushed down by a lid opening tool during the lid opening operation, the tip of the small lid has a circular motion locus centering on the support axis of the lid opening arm. The tip of the small lid and the inner peripheral slope surface of the frame so that the tip of the small lid does not contact the inner peripheral slope surface (tapered surface) of the frame at this time. Therefore, there is a problem in that rainwater or earth and sand flows from the gap and loads on the sewage treatment. Further, since the eaves member is pivotally supported on the back surface of the lid so that it engages with the inner protrusion of the frame only by its own weight, it can be disturbed when the underground structure lid is installed on a slope or in a manhole. When floating pressure water was generated, there was a problem that it was unlocked unexpectedly.
[0006]
The present invention has been made in view of the above-described points, and prevents inflow of rainwater and earth and sand into the manhole, and when a cover for an underground structure is installed on a slope or turbulent pumped water is generated in the manhole. 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 it occurs.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, an engaging protrusion that engages with the lock seat of the receiving frame is formed at the lower portion, an unlocking protrusion is formed on the upper surface, and is pivotally supported below the opening of the lid body. that the locking hook, said locking hook through an elastic member mounted for pressed, and a closing plate for closing the opening, said locking hook, when the closure plate to open and close the opening A guide surface for guiding the closing plate so as not to come into contact with the inner peripheral surface of the receiving frame is provided on the surface on the center side of the lid main body of the unlocking protrusion , and the closing plate includes the closing plate. A convex portion that slides on the guide surface when pressed down is provided .
In the second aspect of the present invention, an engaging protrusion that engages with the lock seat of the receiving frame is formed at the lower portion, an unlocking protrusion is formed on the upper surface, and is pivotally supported below the opening of the lid body. And a locking plate that is attached to the locking rod via an elastic member so as to be able to be pressed, and closes the opening. The locking rod has a closing plate that opens and closes the opening. A guide surface for guiding the closing plate so as not to come into contact with the inner peripheral surface of the receiving frame is provided on the surface on the center side of the lid main body of the unlocking protrusion, and the closing plate includes the closing plate. Provided with a convex portion that slides on the guide surface when lowered by being pressed, and after the closing plate descends linearly without drawing a circular motion path along the guide surface, the locking rod rotates It is configured to be unlocked.
[0008]
In the above configuration, when the lid body is fitted to the receiving frame and closed, the locking protrusion of the locking rod 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 a manhole or when an underground structure lid is installed on a slope.
[0009]
When opening the lid, press the indented portion formed on the tip side of the bar from the opening of the lid body, press down the closing plate, and then rotate the bar, then the indented portion is a protruding piece for unlocking the lock Is pressed, the engaging projection is separated from the lock seat of the receiving frame, and unlocked. When the closing plate is opened and closed, since the convex portion provided on the closing plate is smoothly guided by the guide surface, the unlocking operation by the bar becomes easy.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the guide surface is configured to be an inclined surface in which at least the upper part is inclined downward toward the center side of the lid body.
With such a configuration, the opening and closing of the closing plate is guided more smoothly by the guide surface, and the unlocking operation by the bar is further facilitated.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of an underground structure lid to which an underground structure lid locking structure 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. FIG. 3 is an exploded perspective view of the locking structure shown in FIG. As shown in FIG. 1, the underground structure lid 1 has a circular shape in plan view, which includes a receiving frame 2 and a lid main body 3 attached to the receiving frame 2 by taper fitting. Installed to be flush with the surface. The lid body 3 is connected to the receiving frame 2 by a hinge structure 4 provided on one side, and is engaged with the receiving frame 2 by a locking structure 5 provided on the other side to prevent opening and lifting. When the lid body 3 is opened, the indented portion 20a formed at the tip of the burl 20 (FIG. 6) as a lid-dedicated tool is inserted into the opening 3a provided at the outer peripheral edge of the lid body 3 to lock the lid body 3. Is unlocked, pulled up above the receiving frame 2 by the bar 20, and opened by horizontal turning or vertical reversal through the hinge structure 4.
[0012]
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 2 b provided on the inner peripheral surface 2 a of the receiving frame 2, and the support portion 6 of the lid body 3. It consists of a locking rod 7 that engages with the locking projection 2c of 2b. As shown in FIG. 2, the support portion 6 is integrally formed on the lower surface of the lid body 3, and one end of each of the side walls 6a and 6b is located on both sides of the opening 3a and is connected to the inner surface of the edge winding portion 3b. It is installed. Shaft holes 6c and 6d are provided on the inner surfaces of the side walls 6a and 6b so as to face each other. The shaft hole 6d on one side opens to the center side of the lid body 3, and a bolt hole 6e is provided near the opening. Is provided.
[0013]
As shown in FIG. 1, in the receiving frame 2, a lock seat 2b is recessed at a position corresponding to the lock rod 7 at the lower portion of the inner peripheral surface 2a, and a lock projection 2c is formed at the upper opening edge of the lock seat 2b. It is provided facing down. The locking protrusion 2c can be engaged with the engaging protrusion 7a of the locking rod 7 when the lid body 3 is pulled up or pushed up by lifting pressure.
As shown in FIGS. 3 and 4, the locking rod 7 is formed with an engaging protrusion 7 a extending in a substantially V shape obliquely upward from the lower end on the front portion (the outer periphery side of the lid body 3), and a weight portion on the rear portion. 7b is provided. The engagement protrusion 7a is formed in a shape that is difficult to come off by being deeply engaged with the lock protrusion 2c provided on the lock seat 2b of the receiving frame 2. A pair of unlocking protrusions 7d and 7d are formed on the left and right sides of the front portion of the upper surface 7c so as to face each other. The interval between the projecting pieces 7d and 7d is set wider than the width of the opening (bar hole) 3a of the lid body 3 as shown in FIG. 2, and is located on both sides below the opening edge of the opening 3a. It is like that. Further, support shafts 7f and 7f are formed so as to protrude laterally at upper ends of both side portions 7e and 7e slightly rearward (center side of the lid main body 3) from these projecting pieces 7d and 7d. A circular recess 7g as a spring seat is provided at the center of the upper surface 7c, and a rectangular shaft hole 7h is provided through the center from the upper surface to the lower surface.
[0014]
As shown in FIG. 4, the back surface (center side of the lid body 3) of each protruding piece 7 d is an inclined surface 7 i that slopes downward from the upper end toward the center side of the lid body 3. Is provided with a long guide surface 7j in the vertical direction. The guide surface 7j has a shape in which an upper end opens at an upper portion of the inclined surface 7i and a lower end opens at substantially the center of the inner surface of the side portion 7e. The inclined surface 7i ′ positioned above the guide surface 7j of the inclined surface 7i has a function as a guide surface of the convex portion 8h of the closing plate 8 described later. Therefore, the guide surface is composed of an inclined surface 7i ′ (hereinafter referred to as “guide surface 7i ′”) and a guide surface 7j, and the upper guide surface 7i ′ is the same as the inclined surface 7i, that is, on the center side of the lid body 3. An inclined surface that slopes downward from the upper end toward the lower side is formed. These guide surfaces 7 i ′ and 7 j guide the front end surface 8 c of the closing plate 8 so as not to contact the inner peripheral surface 2 a (FIG. 2) of the receiving frame 2 when the closing plate 8 is pushed down.
[0015]
As shown in FIGS. 2 and 3, the closing plate 8 is for closing the opening 3a of the lid body 3 so that it can be opened and closed. The closing plate 8 is wider than the opening 3a and has a front portion (outer side of the lid body 3). The locking rod 7 can be moved up and down with a slight gap between the left and right projecting pieces 7d, 7d. The upper surface 8a is formed with a closing portion 8b that is fitted into the opening 3a from below, a square bar-shaped support shaft 8d is suspended from the center of the lower surface, and a protrusion 8e is provided on the lower end surface. The support shaft 8d is slidably and non-rotatably passed through a rectangular shaft hole 7h provided on the upper surface 7c of the lock rod 7 with a slight gap. Thereby, the closing plate 8 can be moved up and down with respect to the locking rod 7 so as not to rotate. A flange 8f is provided on the lower surface of the closing plate 8 concentrically around the support shaft 8d. Protrusions 8h, 8h are provided on the front portions of both side surfaces 8g, 8g of the closing plate 8, and can slide on the guide surfaces 7i ', 7j, 7i', 7j of the locking rod 7. These convex portions 8h are curved surfaces in which a surface 8h ′ extending from the front surface to the lower surface is a sliding surface (hereinafter referred to as “sliding surface 8h ′”) with the guide surfaces 7i ′ and 7j. Thereby, the convex portion 8h can smoothly slide on the guide surfaces 7i ′ and 7j.
[0016]
The support shaft 8d of the closing plate 8 is penetrated into the shaft hole 7h of the locking rod 7 via a coil spring 9 as an elastic member and a dustproof / waterproof boot 10, and a stopper (washer) 11 is provided on the projection 8e at the lower end. It is fitted and fixed by caulking, and is slidably mounted in the vertical direction. The coil spring 9 is contracted between the recess 7 g and the lower surface of the closing plate 8, and the upper end of the boot 10 is fitted into a flange 8 f protruding from the lower surface of the closing plate 8 and the lower end is fitted into the recess 7 g of the locking rod 7. Combined. In this way, the closing plate 8 is attached to the lock rod 7. The elastic member is not limited to the coil spring, and other members such as a rubber member and sponge rubber can also be used.
[0017]
As shown in FIG. 2, the locking rod 7 is configured such that the closing portion 8 b of the closing plate 8 is fitted into the opening 3 a of the lid body 3 from below, and the edge of the upper surface 8 a is the lower surface of the opening edge of the opening 3 a of the lid body 3. The support shafts 7f and 7f are pivotally supported in the shaft holes 6c and 6d of the side walls 6a and 6b of the support portion 6 in a state in which the spring 9 is compressed by being in contact with and locked to the shaft. At this time, the support shaft 7f can be attached because the shaft hole 6d on one side is notched. Next, 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 rod 7 and the closing plate 8 are attached to the lid body 3.
[0018]
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 rod 7 of the locking structure 5 is suspended by the weight portion 7 b and is urged to the locking position by its own weight. The locking protrusion 7 is positioned below the locking protrusion 2c with the engaging protrusion 7a entering the lock seat 2b of the receiving frame 2 at the locking position. 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 pressed against the lower surface of the opening edge of the opening portion 3a, the closing portion 8b is fitted to the opening portion 3a, and the tip end surface thereof 8 c is in contact with the inner peripheral surface 2 a of the receiving frame 2. As a result, the opening 3 a is closed by the closing plate 8. Further, the locking rod 7 is urged to the locking position by the spring force of the coil spring 9 in addition to the above-described urging by its own weight, so that play is suppressed and held at the locking position.
[0019]
When the lid main body 3 is pulled up to be opened by a person other than the operator in this closed state, or when lifting pressure from the inside of the manhole is applied to the lid main body 3 and pushed up, the locking rod 7 The engaging projection 7a engages with the locking projection 2c of the receiving frame 2 and is prevented from moving upward. Thereby, the lid body 3 is prevented from being opened. 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. In addition, the locking rod 7 is held in the locked position by the spring force of the coil spring 9 so that the turbulent pumped water is generated in the manhole or the underground structure lid is sloped. Unexpected unlocking when installed in
[0020]
When the lid body 3 is opened, a dedicated bar 20 is used as shown in FIG. As described above, the bar 20 is formed such that the indented portion 20a at the tip is substantially T-shaped and the root portion thereof is inclined with respect to the shaft portion 20b (FIG. 8). The operator inserts the indented portion 20a of the bar 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 on its lower surface. . When the closing plate 8 is pushed down, the projections 8h, 8h on both sides slide along the guide surfaces 7i ', 7j, 7i', 7j of the locking rod 7 and the protruding pieces 7d, 7d of the locking rod 7 are moved accordingly. Smoothly move downward between. The guide surfaces 7i ′ and 7j are formed in such a direction as to guide the distal end surface 8c away from the inner peripheral surface 2a of the receiving frame 2 toward the center side of the lid body 3 when the closing plate 8 is pushed down. The closing plate 8 moves downward with a slight gap without the front end surface 8c coming into contact with the inner peripheral surface 2a of the receiving frame 2. Next, the bar 20 is rotated by 90 ° so that the indented portion 20a straddles the opening 3a as shown by a two-dot chain line in FIG. 2, and the upper surface 20c of the indented portion 20a is opened in the opening 3a as shown in FIG. Contact the lower edge of the edge. In this state, the side surface 20d on one side of the indented portion 20a contacts the inclined surfaces 7i and 7i of the projecting pieces 7d and 7d of the lock rod 7.
[0021]
Next, when the operator pulls the bar 20 in the direction of the arrow A, the side surface 20d is the inclined surfaces 7i and 7i of the projecting pieces 7d and 7d with the upper surface 20c of the indented portion 20a in contact with the lower surface of the opening edge of the opening 3a. Along with this, a downward force is applied to the locking rod 7 and the support shafts 7f and 7f (FIG. 2) are pivoted in the direction of arrow C to engage them as shown in FIG. The protrusion 7a is separated from the collar 2b, and the locking structure 5 is unlocked. The opening and closing of the closing plate 8 is smoothly guided by the guide surfaces 7i ′ and 7j (FIG. 4), and the unlocking operation by the bar 20 is facilitated. Next, when the operator pulls up the bar 20 in the direction of arrow B, the lid body 3 is lifted and opened.
[0022]
When the lid body 3 is closed, the locking rod 7 is left in a free state, and when the lid body 3 is placed on the receiving frame 2 as it is, the locking rod 7 acts on the gravity center position of the weight portion 7b around the support shaft 7f. Is rotated and locked at the locking position. Further, the closing plate 8 is pushed up by the spring force of the coil spring 9 so that the closing portion 8 b is fitted into the opening 3 a of the lid body 3, and the front end surface 8 c is in contact with the inner peripheral surface 2 a of the receiving frame 2. Block 3a.
[0023]
Further, in the state where the lid body 3 is closed as shown in FIG. 5, the closure portion 8 b of the closure plate 8 is inserted into the opening portion 3 a by inserting something other than the burl 20 as a dedicated lid opening tool. For example, when the vicinity of the tip is pressed, the closing plate 8 is indicated by a two-dot chain line with the rear end 8a ′ of the upper surface 8a in pressure contact with the lower surface of the edge of the opening 3a as a fulcrum as shown in FIG. It rotates in the direction of arrow D. Along with this, the locking rod 7 rotates in the same direction, and in some cases, the engaging protrusion 7a may be separated from the collar 2b and the locking structure 5 may be unlocked.
[0024]
In the closing plate 8, the sliding surfaces 8h ', 8h' of the convex portions 8h, 8h provided on both side surfaces are smooth on the guide surfaces 7i ', 7j, 7i', 7j of the protruding pieces 7d, 7d of the locking rod 7. Rotate integrally with the locking rod 7 while sliding. As described above, the guide surfaces 7 i ′ and 7 j are arranged such that the front end surface 8 c of the closing plate 8 is separated from the inner peripheral surface 2 a of the receiving frame 2 toward the center of the lid body 3 when the closing plate 8 is pushed down. Thus, the closing plate 8 can be rotated without the front end surface 8 c coming into contact with the inner peripheral surface 2 a of the receiving frame 2. As a result, when the pressing force is released, the closing plate 8 rotates 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, and smoothly returns to the closed state. Structure 5 returns to the locked state.
[0025]
【The invention's effect】
As described above, according to the first or second aspect of the present invention, the opening of the lid main body is always elastically closed by the closing plate, so that the inflow of rainwater and earth and sand into the manhole can be prevented. At the same time, it is possible to prevent unintentional unlocking when turbulent pumped water is generated in the manhole or when a lid for an underground structure is installed on a slope. Further, the opening and closing of the closing plate is smoothly guided by the guide surface, and the unlocking operation by the bar becomes easy.
[0026]
In the invention of claim 3 , the opening and closing of the closing plate is guided more smoothly by the guide surface, so that the unlocking operation by the bar is further facilitated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an underground structure lid to which an underground structure lid locking structure 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 viewed obliquely from above.
4 is a perspective view seen from the back of the locking rod shown in FIG.
5 is a cross-sectional view of a state in which the locking structure shown in FIG. 3 is assembled and attached to a lid body.
6 is an explanatory diagram when unlocking of the locking structure shown in FIG. 5 is started. FIG.
7 is an explanatory diagram of an operation of pushing down the closing plate of the locking structure shown in FIG.
8 is an explanatory diagram in the case of shifting to an unlocking operation after pushing down the closing plate of the locking structure shown in FIG.
FIG. 9 is an explanatory diagram showing an end state of the unlocking operation of the locking structure shown in FIG.
10 is an explanatory diagram showing an example of a locus when a closing plate is pushed down in the locking structure shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lid for underground structures 2 Receiving frame 2a Inner peripheral surface 2b Locking seat 2c Locking protrusion 3 Cover body 3a Opening part 3b Edge winding part 4 Hinge structure 5 Locking structure 6 Supporting part 7 Locking hook 7a Engagement protrusion 7b Weight part 7c Upper surface 7d Projection piece 7f Support shaft 7g Shaft hole 7i Inclined surface 7i 'Guide surface (inclined surface)
7j Guide surface 8 Closing plate 8b Closing portion 8h Protruding portion 9 Coil spring (elastic member)
10 Boot 20 Bar 20a Lower part

Claims (3)

An engaging projection that engages with the lock seat of the receiving frame is formed at the lower part, an unlocking protruding piece is formed on the upper surface, and a locking rod that is pivotally supported below the opening of the lid body,
It is attached to the locking rod via an elastic member so that it can be pushed down, and includes a closing plate that closes the opening ,
Wherein the locking hook, the guiding surfaces the closure plate is to induce the closure plate so as not to contact with the inner peripheral surface of the receiving frame when opening and closing the opening, the lid of the protrusion for the unlocking Provided on the center side surface of the body,
A locking structure for a lid for an underground structure , wherein the closing plate is provided with a convex portion that slides on the guide surface when the closing plate is pressed and lowered. An engaging projection that engages with the lock seat of the receiving frame is formed at the lower part, an unlocking protruding piece is formed on the upper surface, and a locking rod that is pivotally supported below the opening of the lid body
It is attached to the locking rod via an elastic member so that it can be pressed down, and includes a closing plate that closes the opening,
The locking bar has a guide surface that guides the closing plate so that the closing plate does not come into contact with the inner peripheral surface of the receiving frame when opening and closing the opening, and the lid of the unlocking protrusion. Provided on the center side surface of the body,
The closing plate is provided with a convex portion that slides on the guide surface when the closing plate is pressed and lowered.
After the closing plate descends linearly without drawing a locus of circular motion along the guide surface, the locking rod is rotated and unlocked.
A structure for locking a lid for an underground structure. Locking structure of the guide surface, at least the upper lid for underground structures according to claim 1 or 2 is an inclined surface that inclined downward toward the center of the lid body.

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