JP3121167U - Locking device for lid for underground structure - Google Patents

Abstract

A sliding contact area between a support shaft of a closing member and an inner wall of a through hole of a lock body is reduced to reduce frictional resistance. Provided is a locking device for a lid for an underground structure in which the support shaft is smoothly slid so as to expand.
In a locking structure for a lid for an underground structure including a lid body 3 having an opening at a peripheral edge and a lock body 6 engaged with a lock seat at a lower portion thereof, the closing member of the opening 3a is an opening. A locking plate having a closing plate 8a for closing the portion 3a from below, a support shaft 8b integrally suspended downward from the lower surface of the closing plate 8a, and a washer attached to the lower end of the support shaft 8b. 6 has a through-hole 7 in a downward direction from the upper surface, and the through-hole 7 is slidable without rotating at the upper part of the length of 1/6 or less of the support shaft 8b. The lower part is enlarged in diameter so that the support shaft 8b is not in contact with the inner wall and the washer is in contact with the inner wall to form a slidable shape.
[Selection] Figure 4

Description

  The present invention relates to a locking structure for locking a lid of an underground structure.

Conventionally, in this type of underground structure lid locking structure, the underground structure lid has a receiving frame installed at the opening at the upper end of the underground structure, and a lid body supported by a taper fit or the like on the receiving frame. The lid main body is connected to the receiving frame by a hinge structure so that the lid main body can be opened and closed by horizontal turning or vertical reversal, and a locking structure for locking the lid main body and the receiving frame is provided. As the locking structure, as described in Patent Document 1, in order to unlock the lock body, a lock body having a protrusion pivotably pivoted on the lower surface of the lid body and engageable with the receiving frame. And a closing mechanism for closing an opening opened in the lid main body for inserting a lid opening tool such as a bar. As this closing mechanism, the rod (sliding rod) of the closing plate that closes the opening is slidably inserted into the sleep built in the lock body, and the closing plate is pushed down by the opening tool during unlocking. The rod slides in the sleeve.
Japanese Utility Model Publication No. 7-56357 (page 2, left column, line 49 to right column, line 4, FIG. 2, FIG. 4, FIG. 5)

In the conventional locking structure, a sleeve having a flange at the upper end is inserted into the through hole of the lock body, the entire inner wall of the through hole of the lock body is covered with this sleeve, and the sliding of the sleeve is suspended by the closing plate. The scissors are inserted, and the entire outer peripheral surface of the sliding scissors slides in contact with the inner wall of the sleeve. Therefore, there is a large frictional resistance between the sliding rod and the sleeve, and there is a risk of clogging with fine sand, dirt or dust between the sliding rod and the sleeve. There is a risk of lack of smoothness.
In addition, a specially structured closing plate and sleeve are required, and the cost is increased.

An object of the present invention is to provide a locking structure in which a sliding contact area between a support shaft and a lock main body is narrow, friction resistance is small, and the support shaft slides smoothly when the closing plate is pushed down.
In addition, when the closing plate is pushed down, the support shaft is in contact with the inner wall of the through hole of the lock body at intervals in two upper and lower positions, and does not cause shaft runout, and the support shaft operates smoothly and stably. Accordingly, since there is no difficulty in sliding the support shaft, the object is to provide an inexpensive locking structure that does not cause distortion on the inner wall of the support shaft or the through hole, has a long life, and does not require a sleeve. .

A lid main body having an opening at the peripheral edge, a receiving frame having a recessed lock seat with an opening formed on the inner peripheral surface thereof, and an engaging projection for engaging with the lock seat at the lower part are formed, An unlocking protrusion is formed on the upper surface, and a lock body pivotably supported below the opening of the lid body, and is attached to the lock body so as to be able to be pushed down via an elastic member. In a locking structure for a lid for an underground structure, comprising: a closing member that closes the opening portion; and a cover that extends and contracts together with the elastic member and covers the elastic member.
The closing member includes a closing plate for closing the opening of the lid body from below, a square bar integrally suspended downward from the lower surface of the closing plate, and a washer attached to the lower end of the square bar The lock body has a through hole in a downward direction from the upper surface, and the through hole has an upper portion of a length of 1/6 or less of the total length, and the square bar of the closing member is in contact with the lock body. In addition, it is a square shape that is slidable without rotating, and its lower part is expanded in diameter so that the square bar does not contact the inner wall and the washer can contact and slide Is formed,
The length of the square rod of the closing member is equal to or longer than the entire length of the through hole,
The sliding contact portion between the blocking member and the inner wall of the through hole of the lock body has a portion where the square bar of the closing member fitted into the through hole is in contact with the inner wall of the through hole, and the washer penetrates. When the lid plate is pushed to open the lid main body and the square bar of the closure member is pushed down, the gap between the sliding wall and the portion that comes into sliding contact with the inner wall is lowered. The washer also slides down so that the interval between the two sliding contacts is widened.

The other structure of the locking structure is as follows.
That is, the closing member has a closing plate that closes the opening of the lid body from below, and a square bar that is integrally suspended downward from the lower surface of the closing plate,
The lock body has a through hole in the downward direction from the upper surface, and the through hole is composed of four parts, a reduced diameter through hole, an enlarged diameter through hole, a reduced diameter through hole, and an enlarged diameter through hole in order from the top. The length of each of the two reduced diameter through-holes is not more than one-sixth of the entire length of the through-hole, and the length between the two reduced-diameter through holes is three-thirds of the total length of the through-hole. 2 or more, and the reduced diameter through-hole has a rectangular shape with a dimension that allows the square bar of the closing member to contact the inner wall and rotate without rotating, and the enlarged diameter through-hole is formed on the inner wall. The shape of the dimension that the square bar of the closing member does not contact,
The length of the square rod of the closing member is equal to or longer than the entire length of the through hole,
The sliding contact portion between the square bar of the closing member inserted into the through hole and the lock body is two places on the inner wall of the two reduced diameter through holes with a space therebetween.

  The elastic member is preferably a coiled spring.

An embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows an underground structure lid 1 to which an underground structure lid locking structure 5 according to the present invention is applied.
The lid for an underground structure 1 is formed by a receiving frame 2 having a substantially circular or rectangular opening, and a lid body 3 having the same shape as the opening of the receiving frame 2 attached to the opening of the receiving frame 2 by taper fitting. The lid body 3 is installed so as to be flush with the ground surface. In the receiving frame 2, a lock seat 2b is provided in a concave shape at a position corresponding to the lock body 6 at a lower portion of the inner peripheral surface 2a, and a lock projection 2c is provided on the upper opening edge of the lock seat 2b so as to face downward. ing. The locking protrusion 2c is configured such that the engaging protrusion 6a of the lock body 6 can be engaged when the lid body 3 is pulled up or pushed up by lifting pressure. The lid body 3 is connected to the receiving frame 2 by a hinge structure 4 provided on the lower surface on one side, and is engaged with the receiving frame 2 by a locking structure 5 provided on the lower surface on the other side to open the lid and in the underground structure. The lid body 3 is prevented from being lifted by turbulent pumped water. The lid body 3 has an unlocking opening 3a at the peripheral edge.

FIG. 2 shows an exploded locking structure 5, and FIGS. 3 and 4 show the locking structure 5 incorporated in the underground structure lid 1.
The locking structure 5 is attached to support side walls 3b and 3c integrally formed on the lower surface of the lid body 3, a lock seat 2b provided at a lower portion of the inner peripheral surface 2a of the receiving frame 2, and support side walls 3b and 3c. The lock main body 6 is engaged with the lock protrusion 2c of the lock seat 2b. As shown in FIG. 3, the support side walls 3b and 3c are integrally formed on the lower surface of the lid body 3, and one end of each of the support side walls 3b and 3c is disposed on both sides of the unlocking opening 3a. . Bearing holes 3d and 3e are provided on the inner surfaces of the supporting side walls 3b and 3c so as to face each other, and the bearing hole 3e on one side is formed on the center side of the lid body 3 in order to allow the lock body 6 to be attached. There is an opening in the position, and in the vicinity of the opening, there is provided a bolt hole 3f through which a bolt 12 is inserted to prevent the lock body 6 pivoted in the bearing hole 3e from falling off.

The lock body 6 is formed of a casting, and has a shape in which an engagement protrusion 6a extends obliquely upward from the lower end in a substantially V shape on the front part (outer peripheral side of the lid body 3). A portion 6d is provided. The engagement protrusion 6a is shaped so that it is difficult to come off because the engagement with the lock protrusion 2c provided on the lock seat 2b of the receiving frame 2 is deepened.
A pair of unlocking protrusions 6c are formed on the front left and right sides of the upper surface of the lock body 6 so as to be opposed to each other. The interval between the projecting pieces 3c is set wider than the width of the unlocking opening 3a of the lid body 3, and is disposed so as to be positioned on both sides below the opening edge of the unlocking opening 3a. Has been. Support shafts 6b and 6b are formed to protrude laterally at the upper ends of both ends slightly rearward (center side of the lid body 3) from the protruding pieces 3c. A through hole 7 is provided in the center of the upper surface of the lock body 6 so that a support shaft 8b of a closing member 8 described later can be fitted and slid.

The through-hole 7 is provided vertically in the center of the upper surface of the lock body 6, and the upper opening has a rectangular cross-sectional shape with a rectangular through-hole 7 a, and the lower portion has a diameter-expanded cross-sectional shape with a square or circular shape. It is a hole 7b.
The length of the through hole 7a is shortened, and the contact surface with the support shaft 8b is narrowed. For example, the length is preferably about 1/6 to 1/7 of the entire length of the through hole 7. This is because if the length of the through-hole 7a is increased and the contact surface with the support shaft 8b is widened, the frictional resistance between the support shaft 8b and the inner wall of the through-hole 7a is increased, preventing smooth sliding of the support shaft 8b. Because there is a fear. Further, when the support shaft 8b slides, the distance from a washer 9 described later does not increase so much, and stable sliding of the support shaft 8b may not be useful.
It is preferable that an annular recess 7c is provided around the upper opening of the through hole 7a on the upper surface of the lock body 6 with the through hole 7a as a center. The recess 7c is for fitting a spring 10 and a lower edge of the cover 11 described later.

The closing member 8 is for closing the unlocking opening 3a of the lid body 3 so as to be openable and closable. The closing member 8 is made of a hard and rust-free metal, such as stainless steel, and has the same structure as the closing plate 8a. A circular protrusion 8d on the lower surface thereof, a square bar-shaped support shaft 8b suspended perpendicularly to the center of the lower surface, and a washer 9 fitted and fixed to the protrusion 8c at the lower end of the support shaft 8b. It becomes more.
The closing plate 8a can move up and down with a slight gap between the left and right protrusions 6c of the lock body 6 at the front (the outer peripheral side of the lid body 3). The lock opening 3a has a bulging portion that fits from below, and a circular protrusion 8d on the lower surface is provided with a circular groove centering on the support shaft 8b. Instead of providing the circular protrusion 8d, an annular groove may be provided on the lower surface of the closing plate 8a. This groove is for fitting an upper edge portion of an elastic member described later, for example, the spring 8 and the cover 11.
The support shaft 8b is in the shape of a square bar, is slidably inserted into the through hole 7a of the lock body 6 and is non-rotatable, and is inserted through the through hole 7b at a distance from the inner wall thereof.
The washer 9 has a notch for draining, the shape of which is the same as the shape of the cross section of the through hole 7b of the lock body 6, and is fitted and fixed to the protrusion 8c at the lower end of the support shaft 8b. When the support shaft 8b moves up and down, the outer peripheral wall comes into contact with the inner wall of the through-hole 7b to enable sliding.

  The locking structure 5 includes an elastic member that inserts a support shaft 8b on the upper surface of the closing plate 8a and the lock body 6 and biases the closing plate 8a upward, such as a coiled spring 10 and a dustproof / A waterproof cover 11 that can be vertically expanded and contracted is provided.

The procedure for attaching the locking structure 5 to the lid body 3 is as follows.
That is, the bulging portion of the upper surface of the closing plate 8a of the closing member 8 is fitted from below the unlocking opening 3a of the lid body 3, and the upper surface around the bulging portion of the closing plate 8a is used for unlocking. The support shaft 6b of the lock body 6 is pivotally supported by the bearing holes 3d and 3e of the support side walls 3b and 3c of the lid body 3 in a state where the spring 10 is compressed by being brought into contact with the lower surface of the opening 3a. Since the support side wall 3c has an opening, the support shaft 6b can be attached.
Next, the bolt 12 is inserted into the bolt hole 3f of the support side wall 3c, and the nut 13 is screwed to prevent the support shaft 6b pivotally supported by the bearing hole 3e from falling off.
In this way, the lock body 6 and the closing member 8 are attached to the lid body 3. In this state, the closing plate 8a is pushed up by the spring force of the spring 10 to close the unlocking opening 3a of the lid body 3 from below, and the closing member 8 is provided on the lock body 6 with which the support shaft 8b contacts. The lock body 6 is in contact with the inner wall of the through hole 7a and the inner wall of the through hole 7b with which the washer 9 is in contact with each other at two locations.
The lock body 6 is urged to the locking position by the spring force of the spring 10 in addition to the urging by its own weight, so that play is suppressed and held at the locking position. In this state, the lock body 6 hangs down by the weight portion 6d and the engagement protrusion 6a is positioned below the lock protrusion 2c of the receiving frame 2 due to its own weight, and the lid body 3 is lifted by human power or pumping. The engagement protrusion 6a is blocked by the locking protrusion 2c, and the lid body 3 does not lift.

The lid body 3 is opened as follows.
That is, a dedicated bar 14 is used as shown in FIGS. The operator inserts the indented portion 14 a of the burl 14 into the unlocking opening 3 a of the lid body 3, and pushes down the closing plate 8 a against the spring force of the spring 10 on its lower surface. When the closing plate 8a is pushed down, the support shaft 8b comes into contact with the inner wall of the through hole 7a of the lock body 6 and slides down, and the washer 9 comes into contact with the inner wall of the through hole 7b and slides down. In this case, since the interval between the portion that contacts the support shaft 8b and the inner wall of the through hole 7a and the portion that contacts the through hole 7b of the washer 9 gradually increases as the closing plate 8a descends, the support shaft 8b swings. In addition, since the support shaft 8b has a short contact area with the through-hole 7 of the lock body 6 and a small contact area, the frictional resistance is small, and the support shaft 8b descends smoothly and stably.
Further, since the support shaft 8b is lowered without swinging, the front edge (the inner peripheral side of the receiving frame 2) of the closing plate 8a moves downward without coming into contact with the inner peripheral surface of the receiving frame 2. Therefore, the projections on both sides of the closing plate as in the conventional example are not required.

Next, as shown in FIG. 6, the bar 14 is rotated 90 degrees so that the indented portion 14a of the burl 14 straddles the unlocking opening 3a, and the upper surface of the indented portion 14a is brought to the lower surface of the unlocking opening 3a. Make contact. In this state, the side surface of the indented portion 14 a located on the outer peripheral side of the lid body 3 abuts on the inclined surface on the center side of the protruding piece 6 c of the lock body 6.
In this state, when the burl 14 is inclined approximately 45 degrees in the A direction, the side surface of the indented portion 14a slides on the inclined surface of the protruding piece 6c, and accordingly, a downward force acts on the lock body 6 to support it. The shaft 6b is pivoted in the B direction with the fulcrum as a fulcrum, and the engaging projection 6a is isolated from the lock seat 2b as shown in FIG. 7, and the locking structure 5 is unlocked. Next, when the bar 14 is pulled up in the C direction, the lid body 3 is lifted and opened.

Another embodiment will be described with reference to FIGS.
The lock body 16 includes a locking projection 6a, a support shaft 6b, a protruding piece 6c, and a weight portion 6d, as in the lock body 6 of the previous embodiment. The same as the main body 6.
However, the configuration of the vertical through-holes 17 opening on the upper and lower surfaces of the lock body 16 is different from the configuration of the through-holes 7 of the lock body 6.

  The through-hole 17 is made up of through-holes 17a, 17b, 17c and 17d successively from the top to the bottom. The through-holes 17a and 17c have a square cross-sectional shape and can be fitted with a rectangular rod-like support shaft 18b of a closing member 18 described later, and the inner wall thereof is in contact with the support shaft 18b, and the support shaft 18b rotates. It can slide without. The through-holes 17b and 17d have a square or circular cross-sectional shape that is larger than the diameter of the through-holes 17a and 17c, and their inner walls are spaced apart from the support shaft 18b.

  The upper and lower intervals between the through holes 17a and 17c are preferably wider, and therefore the length of the through hole 17b in the upper and lower direction is better. Further, the lengths of the inner walls of the through holes 17a and 17c in the vertical direction are preferably shorter. The length from the upper opening edge of the through-hole 17a to the upper end of the through-hole 17d is not limited, but in order for the support shaft 18b to slide stably without swinging, the length of the entire through-hole 17 is not limited. It is preferable to set it to 2/3 or more. The lengths of the through holes 17a and 17c in the vertical direction are not limited, but in order to reduce the frictional resistance between the through holes and the support shaft 18b, the length of the entire through hole 17 is 1/6 or less. It is preferable to do this.

The blocking member 18 includes a blocking plate 18a, a support shaft 18b, and a protrusion 18d, which are the same as the structure and operation of the blocking member 8 of the previous embodiment. The protrusion 18d can be omitted in the same manner as the closing member 8 of the previous embodiment.
The lower end of the support shaft 18b is provided with a protrusion 18c for caulking and attaching a washer 19 having a notch for draining water. The washer 19 is used for retaining, and its peripheral wall may or may not contact the inner wall of the through-hole 17.

Similarly to the previous embodiment, the support shaft 18b is inserted through the elastic member, for example, the spring 10 and the cover 11, and the tip thereof is fitted into the through hole 17, and the washer 19 is projected from the tip of the through hole 17d. Caulking and fixing to 18c.
The support shaft 18b is slidably in contact with the two inner walls of the through holes 17a and 17c.

  The locking and unlocking method in this locking structure is the same as in the locking structure of the previous embodiment. When the closing plate 18a is pushed down, the support shaft 18b descends through the through hole 17. However, the support shaft 18b is always in contact with the inner wall at two places where the distance between the through holes 17a and 17c is wide and stable, and the shaft does not run out. Further, since the areas of the two inner walls are narrow, the frictional resistance is small and the support shaft slides smoothly. Therefore, distortion of the inner walls of the support shaft 18b and the through holes 17a and 17c hardly occurs. Further, since the support shaft 18b is lowered without swinging, the front edge (the inner peripheral side of the receiving frame 2) of the closing plate 18a moves downward without coming into contact with the inner peripheral surface of the receiving frame 2. Therefore, the projections on both sides of the closing plate as in the conventional example are not required. Further, since the area where the support shaft 18b is in contact with the inner wall of the through hole is small, there is no possibility of clogging with sand, earth, dust, or the like.

It is sectional drawing of the lid | cover for underground structures. It is an exploded view of the locking structure concerning this device. It is a principal part top view in the state where the locking structure concerning this device was attached to the lid main part. It is principal part sectional drawing of the state which attached the locking structure which concerns on this device to the lid body. It is explanatory drawing of the state which inserted the front-end | tip part of the bar into the opening part for unlocking of a lid | cover main body for unlocking. It is explanatory drawing of the state which inserted the front-end | tip part of the bar into the unlocking opening part of the lid body, and pushed down the obstruction board. It is explanatory drawing of the state which pushed down the obstruction board and rotated the lock main body. It is principal part sectional drawing of the state which attached the locking structure of other embodiment of this invention to the lid body. FIG. 9 is an explanatory diagram of a state in which the tip of the bar is inserted into the unlocking opening of the lid body and the closing plate is pressed down in the state of FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lid for underground structures 2 Receiving frame 2a Inner wall 2b Lock seat 3 Lid main body 3a Unlocking opening 3b, 3c Support side wall 3d, 3e Bearing hole 3f Bolt 4 Hinge structure 5 Locking structure 6 Lock main body 6a Engagement protrusion 6b Support Shaft 6c Protruding piece 6d Weight portion 7 Through hole 7a Rectangular through hole 7b Expanded through hole 8 Closing member 8a Closing plate 8b Support shaft 8c Protrusion 8d Protruding portion 9 Washer 10 Spring 11 Cover 12 Bolt 13 Nut 14 Bar 17 Through hole 17a Square through hole 17b Large diameter through hole 17c Square through hole 17d Large diameter through hole 18 Closing member 18a Closing plate 18b Support shaft 18c Protrusion 19 Washer

Claims (3)

A lid main body having an opening at the peripheral edge, a receiving frame having a recessed lock seat with an opening formed on the inner peripheral surface thereof, and an engaging projection for engaging with the lock seat at the lower part are formed, An unlocking protrusion is formed on the upper surface, and a lock body pivotably supported below the opening of the lid body, and is attached to the lock body so as to be able to be pushed down via an elastic member. In a locking structure for a lid for an underground structure, comprising a closing member that closes the opening of the base material, and a cover that expands and contracts together with the elastic member and covers the elastic member.
The closing member includes a closing plate for closing the opening of the lid body from below, a square bar integrally suspended downward from the lower surface of the closing plate, and a washer attached to the lower end of the square bar The lock body has a through hole in a downward direction from the upper surface, and the through hole has an upper portion of a length of 1/6 or less of the total length, and the square bar of the closing member is in contact, and It is a square shape that is slidable without rotating, and its lower part is expanded in diameter so that the square bar does not contact the inner wall, and the washer contacts the slidable shape. Formed,
The length of the square rod of the closing member is equal to or longer than the entire length of the through hole,
The sliding contact portion between the closing member and the inner wall of the through hole of the lock body includes a portion where the square bar of the closing member fitted into the through hole is in contact with the through hole, and the washer is the inner wall of the through hole. When the closing plate is pushed to open the lid main body and the square bar of the closing member is pushed down to lower the lid body, A locking device for a lid for an underground structure, wherein the washer also slides down and the interval between the two sliding contacts widens. A lid main body having an opening at the peripheral edge, a receiving frame having a recessed lock seat with an opening formed on the inner peripheral surface thereof, and an engaging projection for engaging with the lock seat at the lower part are formed, An unlocking protrusion is formed on the upper surface, and a lock body pivotably supported below the opening of the lid body, and is attached to the lock body so as to be able to be pushed down via an elastic member. In a locking structure for a lid for an underground structure, comprising: a closing member that closes the opening portion; and a cover that extends and contracts together with the elastic member and covers the elastic member.
The closing member includes a closing plate that closes the opening of the lid body from below, and a square bar that is integrally suspended downward from the lower surface of the closing plate,
The lock body has a through hole in the downward direction from the upper surface, and the through hole is composed of four parts, a reduced diameter through hole, an enlarged diameter through hole, a reduced diameter through hole, and an enlarged diameter through hole in order from the top. ,
The length of each of the two reduced diameter through holes is one sixth or less of the entire length of the through hole, and the length of the enlarged through hole between the two reduced diameter through holes is the entire length of the through hole. The diameter-reduced through-hole has a rectangular shape with a dimension that allows sliding without rotating while the square bar of the closing member is in contact with the inner wall of the closed-diameter through-hole. The hole is shaped so that the square bar of the closing member does not contact the inner wall,
The length of the square rod of the closing member is equal to or longer than the entire length of the through hole,
The sliding contact portion between the square bar of the closing member inserted into the through hole and the lock main body is two places on the inner wall of the two reduced diameter through holes spaced apart from each other. Locking device for lids for underground structures. The locking device for a lid for an underground structure according to claim 1 or 2, wherein the elastic member is a coiled spring.

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