JP3434932B2 - Manhole with locking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole with a locking device.

[0002]

2. Description of the Related Art Conventionally, there is a rotation lock type of manhole consisting of a disk-shaped lid and a receiving frame into which the lid is fitted. A manhole of this type is shown in the sectional view of FIG. 7 and the outside of FIG. Explaining according to the development view of the inner surface of the cylinder, the lid 10
At least two protrusions 58 are provided on the lower portion of the outer wall of the fitting cylinder 14 provided on the outer circumference of the lower surface of the circular plate 12 of the receiving frame 24.
The annular seat 56 provided on the outer cylinder 26 of the
When it is fitted into the
A vertical groove 60 is provided in phase with the projection 58 so that the outer edge of the vertical seat 60 is placed on the annular receiving seat 56. Further, the projection 58 is inserted into the side surface of the vertical groove 60 as shown in FIG. The lateral groove 62 is made to communicate, and the lid 10 can be rotated.

To lock this rotation lock type manhole, an open / close handle with a hook at the tip is used.
The lid 10 is inserted into a handle bar provided on the surface of the lid 10, the lid 10 is lifted, the protrusion 58 is aligned with the vertical groove 60, and the lid 10 is dropped into the annular receiving seat 56. Subsequently, when the lid 10 is rotated in the direction of the lateral groove 62, the protrusion 58 enters the lateral groove 62 and is in a locked state.

To open the locked manhole, the opening / closing handle is inserted into the handle bar provided on the surface of the lid 10, and the lid 58 is rotated to insert the protrusion 58 into the lateral groove 62 into the vertical groove 60. When moved, the lock mechanism is released.
Then, the lid 10 is lifted as it is to open the manhole.

[0005]

As described above, the conventional rotary lock type manhole has a problem that it is not preferable in terms of security because the lock can be easily unlocked by simply rotating the lid. Therefore, there has been a demand for the development of a rotation lock type manhole in which the lock cannot be easily released by simply rotating the lid. The present invention has been made in view of the above-mentioned problems of the conventional rotary lock type manhole, and an object of the present invention is to provide a manhole with a locking device in which the lock cannot be easily released by simply rotating the lid. .

[0006]

A manhole with a locking device according to claim 1 of the present invention is a lid made of a disc having a fitting cylinder erected on the lower surface of the outer periphery, and an outer cylinder into which the disc is fitted. A manhole comprising: a receiving groove inside the outer cylinder into which the fitting cylinder is fitted; and a receiving frame that is provided inside the receiving groove and that has an inner cylinder that supports the disc from the rear surface, At least two locking plates each having a fixed wall extending vertically from the lower surface are horizontally projected on the inner peripheral surface of the inner cylinder of the receiving frame, and are positioned below the locking plates when closed, and Fixing locking members corresponding to the locking plates in phase with the locking plates at the height at which they come into contact with the stop wall, are fixed to the back surface of the lid, and when the locking members are rotated in the locking direction of the lid, Opposite to the locking direction of the lid, the tip being locked in the normal direction and the tip protruding toward the inner cylinder of the receiving frame One end of a movable locking member having a rotation restricting member that locks in the tangential direction of the lid is attached to the back surface of the lid so as to be horizontally rotatable from the front surface, and the fixed locking member of the lid is locked by the lock. The movable locking member is rotatable at a locking position where it abuts against the stop wall of the plate, and the fixed locking member and the locking plate vertically oppose each other when the lid is rotated in the unlocking direction. The gist of the present invention is that a locking wall, which is in contact with a movable locking member whose front end projects toward the inner cylinder and which is locked in the normal direction of the lid at a position in the state, is provided on the inner peripheral surface of the inner cylinder. .

A manhole with a locking device according to a second aspect of the present invention has a lid formed of a disc having a fitting tube erected on the lower surface of the outer peripheral portion, and the disc is fitted and the lower surface of the outer edge of the disc is supported. An outer cylinder having an annular receiving seat, a receiving groove inside the outer cylinder into which the fitting cylinder is fitted, and an inner cylinder standing upright inside the receiving groove and supporting the disc from the back surface. A manhole consisting of a receiving frame, wherein at least two protrusions that come into contact with the annular receiving seat are provided on the outer surface of the fitting cylinder,
A vertical groove having a depth such that the protrusion is inserted into the annular seat and the disc is placed on the annular seat is provided in phase with the protrusion, and the disc is placed on the annular seat. A projection is inserted into the side surface of the vertical groove so that it can be locked while rotating, and a horizontal groove of a certain length that moves horizontally is made to communicate, and when it is rotated in the locking direction of the lid, it is locked in the normal direction of the lid. One end of a movable locking member having a rotation restricting member that locks in the tangential direction of the lid when the tip projects toward the inner wall of the receiving frame and rotates in a direction opposite to the locking direction of the lid is provided on the back surface of the lid. Is horizontally rotatably attached to the lid, the movable locking member is rotatable at a locking position where the projection of the lid comes into contact with the tip of the lateral groove, and the projection is formed when the lid is rotated in the unlocking direction. When the lid is in the locked position in the lateral groove, Is locked tip line direction is summarized in that a movable locking member which projects toward the receiving frame has projecting abutment for locking the wall to the inner peripheral surface of the inner cylinder.

[0008]

In order to close and lock the manhole with the locking device according to claim 1 of the present invention, first, the movable locking member is rotated from the surface of the lid by a handle or the like in a direction opposite to the locking direction, and the movable locking member is restricted. The member locks in the tangential direction of the lid. Next, lift the lid and align the locking member with the locking plate on the side of the locking plate where there is no stop wall, and then lower the lid.The disc of the lid fits into the outer cylinder of the receiving frame and the lid is closed. The fitting cylinder is fitted into the receiving groove of the receiving frame and supported. Further, the fixed locking member attached to the lid enters the inner cylinder to a position lower than the locking plate and abutting on the stop wall.

Subsequently, when the fixed locking member of the lid is rotated in the direction in which it comes into contact with the stop wall, that is, in the locking direction, and the fixed locking member is brought into contact with the stop wall, the movable locking member does not come into contact with the locking wall. When the movable locking member is rotated in the locking direction from the surface of the lid with the handle or the like, the movable locking member is locked by the regulating member in the normal direction of the lid, and the front end faces the inner cylinder of the receiving frame. Since it protrudes, the lid is locked. That is, even if the fixed locking member of the lid is rotated in the direction away from the stop wall, the fixed locking member and the locking plate are locked in the locked state in which the locking plate and the locking plate oppose each other in the normal direction of the lid. Then, the movable locking member abuts on the locking wall protruding on the inner peripheral surface of the receiving frame. However, since the movable locking member is locked by the restriction member so as not to rotate in the locking direction, the lid cannot be lifted and opened.

To unlock the lid, the fixed locking member of the lid is rotated in the direction in which it comes into contact with the stop wall, that is, in the locking direction, and the fixed locking member comes into contact with the stop wall. The movable locking member is locked in the tangential direction of the lid by the regulating member when the movable locking member is rotated from the surface of the lid in the direction opposite to the locking direction by the handle etc. Since the fixed locking member of the lid can be freely rotated in the direction away from the stop wall, the lid is unlocked. That is, if the fixed locking member of the lid is rotated in the direction away from the stop wall and is rotated to a position where the fixed locking member and the locking plate do not vertically face each other, the lid can be lifted and opened from the receiving frame. it can.

In order to close and lock the manhole with the locking device according to the second aspect of the present invention, first, the movable locking member is rotated from the surface of the lid by a handle or the like in a direction opposite to the locking direction.
The movable locking member is locked by the regulating member in the tangential direction of the lid. A vertical groove is provided on the annular receiving seat of the receiving frame so as to be in phase with the projection, and this vertical groove is the depth at which the projection is inserted and the disk of the lid is placed on the annular receiving seat, so the lid is raised. When the lid is lowered after the phases of the vertical grooves are aligned, the disc of the lid is fitted into the outer cylinder of the receiving frame, and the disc of the lid is placed on the annular receiving seat.

A lateral groove of a fixed length is communicated with the side surface of the vertical groove so that the projection inserted through the lateral groove can be moved horizontally as the lid rotates. Therefore, the projection of the lid rotates in the tip direction of the lateral groove, that is, in the locking direction. However, when the protrusion is brought into contact with the tip of the lateral groove, the movable locking member does not come into contact with the locking wall and is in a rotatable state. Therefore, when the movable locking member is rotated in the locking direction from the surface of the lid with the handle or the like, the movable locking member moves. The locking member is locked by the regulating member in the normal direction of the lid, and the tip projects into the locking groove, so that the lid is locked. That is, even if the protrusion of the lid is rotated in the direction away from the tip of the lateral groove, the movable locking member locked in the normal direction of the lid is locked at the position where the protrusion is in the locked state in the lateral groove. It abuts on the locking wall protruding from the inner peripheral surface. However, since the movable locking member is locked by the restriction member so as not to rotate in the locking direction, the lid cannot be lifted and opened.

In order to unlock the lid, the protrusion of the lid is rotated in the direction of contacting the tip of the lateral groove, that is, in the locking direction, and the protrusion is brought into contact with the tip of the lateral groove, so that the movable locking member contacts the locking wall. Since it is in a rotatable state, when the movable locking member is rotated from the surface of the lid with the handle in the direction opposite to the locking direction, the movable locking member is locked in the tangential direction of the lid by the restricting member and comes into contact with the locking wall. Since it does not do so, the protrusion of the lid can be freely rotated from the horizontal groove to the vertical groove, and the lid is unlocked. That is, if the protrusion of the lid is rotated in the direction away from the tip of the lateral groove and the protrusion is rotated to a position where it moves into the vertical groove, the lid can be lifted from the receiving frame and opened.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 is a bottom view of an embodiment of a lockable manhole of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. Figure 1
6 is a bottom view of the lid rotated in the unlocking direction in the locked state in FIG. 5, FIG. 5 is a plan view of a manhole to which this embodiment is applied, and FIG. 6 is a cross-sectional view taken along the line CC of FIG.

The lid 10 is composed of a disc 12 and a fitting cylinder 14 which is erected on the lower surface of the outer periphery thereof, and two rectangular concave portions 16 and 16 are provided on the outer peripheral portion of the surface with the center interposed therebetween.
At the center of 6, a handle rod 18 is fixed so as to traverse the inside of the recess 16. Further, a locking hole 19 penetrates through the outer peripheral portion which is 90 ° out of phase with the recess 16. Further, a fixed locking member 22 projects toward the lower portion of the inner peripheral surface of the inner cylinder 32 of the receiving frame 24 on the convex portion 20 which is the back surface of the concave portion 16.

The receiving frame 24 is an outer cylinder 26 into which the disc 12 of the lid 10 is fitted, and the fitting cylinder 1 of the lid 10 inside the outer cylinder 26.
2, a receiving groove 28 into which the disc 2 is fitted, an inner cylinder 32 that stands from the inside of the receiving groove 28 and supports the disk 12 from the back surface with a packing 30 interposed between the receiving groove 28 and the back surface of the disk 12 of the lid 10. 22
And a pedestal 34 having a rectangular shape for fixing.

On the inner peripheral surface of the inner cylinder 32 of the receiving frame 22, the lid 10 is attached.
The two locking plates 38 of fixed length are provided in phase with the two fixed locking members 22 attached to the back surface of the above, and a stop wall 36 is hung vertically from one end to which the fixed locking member 22 abuts. It is horizontally projected so as to be located above 22.

90 ° with the fixed locking member 22 on the back side of the lid 10.
A movable locking member mounting plate 40 is fixed by bolts at a position close to the outer peripheral portion, which is out of phase. This mounting plate 40
A through hole 42 penetrates through the center of the mounting hole 40, and the mounting plate 40 is mounted so that the center of the through hole 42 coincides with the center of the locking hole 19.

The lower surface of the mounting plate 40 has a through hole 4
The nut 44 is fixed so that the shaft center and 2 are aligned,
A rotating shaft 46 having a thread on the outer periphery is screwed into the nut 44. The upper part of the rotary shaft 46 penetrates the through hole 42, the upper end thereof is a plate-like engaging projection 48 so as to engage with the tip of the locking handle, and the lower end is a movable locking member. One end of 50 is fixed horizontally.

Further, on the lower surface of the mounting plate 40, a regulating member 52 having a wall in the normal direction of the lid 10 is provided upright adjacent to the nut 44. The movable locking member 50 is a rectangular plate, and has a height at which the movable locking member 50 contacts the regulating member 52.
6 is horizontally fixed, but one corner on the side fixed to the rotating shaft 46 is cut off roundly, and when the movable locking member 50 is rotated counterclockwise in FIG. 1, the movable locking member 50 is rotated. The long side of the member 50 contacts the regulating member 52, the movable locking member 50 is locked in the normal direction of the lid 10, and the movable locking member 5
When 0 is rotated clockwise, the short side of the movable locking member 50 contacts the regulating member 52, and the movable locking member 50 is locked in the tangential direction of the lid 10.

The locking wall 54 is fixed to the inner peripheral surface of the inner cylinder 32 of the receiving frame 22 that is out of phase with the stop wall 36 by a height at which the movable locking member 50 comes into contact when the lid 10 is closed. Has been done. The locking wall 54 rotates the lid 10 counterclockwise in FIG. 1, and in the locked state where the fixed locking member 22 is brought into contact with the stop wall 36, the movable locking member 50 can be freely rotated, and the lid is closed. When the fixed locking member 22 and the locking plate 38 are vertically opposed to each other when the 10 is rotated clockwise, the lid 10 is locked in the normal direction and the front end is fixed to the inner cylinder 32. Movable locking member 2 protruding toward
It is fixed at a position where 2 abuts.

The operation of closing and opening the manhole of the present embodiment having the above structure will be described. To close and lock the manhole, first insert a locking handle (not shown) having an engaging groove at the tip into the locking hole 19 on the surface of the lid 10, and attach the tip to the engaging protrusion 48 of the rotating shaft 46. When engaged and rotated in a direction opposite to the locking direction (clockwise direction in FIG. 1), the movable locking member 50 rotates, and the short side of the movable locking member 50 abuts the regulating member 52 and the tangent line of the lid 10. Locked in the direction. Next, when the lid 10 is lifted and the locking / locking member 22 is brought to a position where the locking plate 38 does not come into contact with the locking plate 38 on the side of the locking plate 38 where the stop wall 36 is not present, the lid 10 is lowered. The fitting cylinder 14 of the lid 10 is fitted in the outer cylinder 26 and the fitting groove 14 of the receiving frame 24. Further, the fixed locking member 22 attached to the lid 10 enters the inner cylinder to a position lower than the locking plate 38 and abutting the stop wall 36.

Subsequently, as shown in FIG. 1, the fixed locking member 22 of the lid is rotated in the direction in which it comes into contact with the stop wall 36, that is, in the locking direction (counterclockwise in FIG. 1), and the fixed locking member 22 is locked. When brought into contact with the stop wall 36, the movable locking member 50
Is in a rotatable state without contacting the locking wall 54. Therefore, when the rotating shaft 46, to which the movable locking member 22 is fixed, is rotated in the locking direction (counterclockwise in FIG. 1) by the locking handle (not shown) inserted into the locking hole 19 on the surface of the lid, the movable locking member 50 moves. The long side contacts the regulating member 52, is locked in the normal direction of the lid 10, and the tip projects toward the inner cylinder 32 of the receiving frame 24. This locks the manhole cover 10. That is, as shown in FIG. 4, even if the fixed locking member 22 of the lid 10 is rotated in the direction away from the stop wall 36 (clockwise direction in FIG. 4), the fixed locking member 22 is rotated.
When the locking plate 38 and the locking plate 38 are vertically opposed to each other in a locked state, the movable locking member 50 is locked in the normal direction of the lid 10.
Comes into contact with a locking wall 54 protruding from the inner peripheral surface of the inner cylinder 32 of the receiving frame 24. However, since the movable locking member 50 is locked by the restriction member 52 so as not to rotate in the locking direction (counterclockwise in FIG. 4), the lid cannot be lifted and opened.

To unlock the lid 10, the fixed locking member 22 of the lid is rotated in the direction in which it comes into contact with the stop wall 36, that is, in the locking direction (counterclockwise in FIG. 1), and as shown in FIG. When the fixed locking member 22 is brought into contact with the stop wall 36,
Since the movable locking member 22 is in a rotatable state without coming into contact with the locking wall 54, the rotating shaft 4 with the movable locking member 22 fixed thereto is provided.
When 6 is rotated in the locking direction (counterclockwise in FIG. 1) with a handle or the like inserted into the locking hole 19 on the surface of the lid, the short side of the movable locking member 50 contacts the regulating member 52, and the movable locking member 50 Is locked by the restricting member 52 in the tangential direction of the lid 10 and does not come into contact with the locking wall 54. Therefore, the lid 10
Direction in which the fixed locking member 22 of FIG.
Can rotate the lid 10 in the clockwise direction).
It will be unlocked. That is, when the fixed locking member 22 of the lid is rotated in the direction away from the stop wall 36 and is rotated to a position where the fixed locking member 22 and the locking plate 38 do not vertically face each other, the receiving frame 24 causes the lid 10 to move. Can be lifted and opened.

In this embodiment, the fixed locking member 22 projects from the inside of the fitting cylinder 14 toward the inner cylinder 32 of the receiving frame 24, and the locking plate 38 for receiving this is provided on the inner peripheral surface of the inner cylinder 32. The manhole of the type described in the conventional example, that is, the receiving frame 24 in which the outer cylinder 26 is provided with the annular receiving seat 56 that supports the lower surface of the outer edge of the disk 12, and the fitting cylinder 1
4 is a lid 10 provided with at least two protrusions 58 that come into contact with the annular receiving seat 56, and the protrusion 58 is inserted into the annular receiving seat 56 so that the disk 12 is placed on the annular receiving seat 56. The vertical groove 60 of the blade is provided in phase with the protrusion 58, and the disc 1
The present invention can also be applied to a manhole having a structure in which a protrusion is inserted into a side surface of a vertical groove 60 and a horizontal groove 62 of a constant length is made to communicate with the side surface of a vertical groove 60 so that 2 can be rotated and locked while being placed on the annular seat 56.

That is, the locking hole 19 is pierced at a position close to the outer periphery, which is 90 ° out of phase with the protrusion 58 of the lid 10, and the lid 1
The center of the through hole 42 formed in the center of the back surface of 0 is the locking hole 1
The mounting plate 40 is attached to the so as to match the center of 9. Since the structures of the nut 44, the rotating shaft 46, the engaging protrusion 48, the movable locking member 50, the restricting member 52, and the locking wall 54 are the same as those of the present embodiment, description thereof will be omitted.

In order to close and lock the manhole with the locking device, first, the movable locking member 22 is rotated from the surface of the lid 10 by a locking handle or the like in a direction opposite to the locking direction. Locks the lid 10 in the tangential direction. A vertical groove 60 is provided on the annular receiving seat 56 of the receiving frame 24 so as to be in phase with the projection 58. The vertical groove 60 allows the projection 58 to be inserted therethrough and allows the disc 12 of the lid 10 to be placed on the annular receiving seat 56. Therefore, if the lid 10 is lifted and the protrusion 58 and the vertical groove 60 are aligned in phase, the lid 10 is lowered.
The disk 12 is fitted into the outer cylinder 26 of the receiving frame 24, and the disk 12 of the lid 10 is placed on the annular receiving seat 56.

A lateral groove 62 of a fixed length is communicated with the side surface of the vertical groove 60 so that the projection 58 inserted through the lateral groove 62 can move horizontally as the lid 10 rotates. That is, it rotates in the locking direction and the projection 58
When the movable locking member 50 is brought into contact with the tip of the lateral groove 62 and the movable locking member 50 is rotatable without contacting the locking wall 54, when the movable locking member 50 is rotated from the surface of the lid 10 in the locking direction by a handle or the like. The movable locking member 50 is locked by the regulating member 52 in the normal direction of the lid 10 and the tip thereof projects toward the inner cylinder 32, so that the lid is locked. That is, even when the protrusion 58 of the lid 10 rotates the lid 10 in the direction away from the tip of the lateral groove 62, the protrusion 58 is locked in the locked state in the lateral groove 62 in the normal direction of the lid 10. The locking wall 5 in which the movable locking member 50 is provided so as to project on the inner peripheral surface of the inner cylinder 32 of the receiving frame 24.
Abut 4. Therefore, the movable locking member 50 is the regulating member 5
As it is locked by 2 so that it does not rotate in the locking direction,
The lid 10 cannot be lifted and opened.

To unlock the lid 10, the protrusion 58 of the lid 10 is used.
Is rotated in the direction of contacting the tip of the lateral groove 62, that is, in the locking direction, and when the projection 58 is contacted with the tip of the lateral groove 62, the movable locking member 50 becomes rotatable without contacting the locking wall 54. When the movable locking member 10 is rotated from the surface of the lid by a handle or the like in the direction opposite to the locking direction, the movable locking member 50 is locked in the tangential direction of the lid 10 by the restricting member 52 and does not come into contact with the locking wall 54. The protrusion 58 of the lid 10 can be freely rotated from the horizontal groove 62 to the vertical groove 60, and is in an unlocked state. That is, when the protrusion 58 of the lid 10 is rotated in the direction away from the tip of the lateral groove 62 and is rotated to a position where the protrusion 58 moves into the vertical groove 60, the lid 10 is lifted from the receiving frame 24 and opened. be able to.

[0030]

According to the manhole with a locking device of the present invention, a locking plate having a fixed length is horizontally projected on the inner peripheral surface of the inner cylinder of the receiving frame,
When the lid is closed, it is positioned lower than the locking plate and at a height that abuts against the stop wall that is hung vertically from the lower surface of one end of the locking plate. It consists of a receiving frame that has an annular seat to support it, and a lid that has a protrusion that contacts the annular seat on the outer surface of the fitting tube of the lid.The protrusion is inserted into the annular seat and the disc is placed on the annular seat. In a manhole with a structure in which a horizontal groove of a certain length is connected to the side surface of the vertical groove so that the vertical groove and the disk of the specified depth can be rotated and locked while being placed on the annular seat, the locking direction of the lid The movable lock has a rotation restricting member that is locked in the normal direction of the lid when it is turned to, and the tip projects toward the inner cylinder of the receiving frame, and that is locked in the tangential direction of the lid when rotated in the direction opposite to the locking direction of the lid. Attach one end of the member to the back of the lid so that it can rotate horizontally from the surface,
The movable locking member can be rotated at the locking position where the fixed locking member of the lid abuts the stop wall of the locking plate, and when the lid is rotated in the unlocking direction, the fixed locking member and the locking plate move up and down. It is characterized in that a locking wall, which abuts against a movable locking member whose end is projected toward the inner cylinder and which is locked in the normal direction of the lid at a position in the opposite locked state, is provided on the inner peripheral surface of the inner cylinder. The movable locking member can be rotated and locked and unlocked freely at the locking position where the fixed locking member of the lid comes into contact with the stop wall of the locking plate, and the lid is fixed in the locked state. Even if the locking member rotates the lid in the direction away from the stop wall, at the position where the fixed locking member and the locking plate are vertically opposed to each other, the movable locking member has the inner peripheral surface of the inner cylinder of the receiving frame. Since it abuts on the locking wall that projects on the It is not possible to open up.

[Brief description of drawings]

FIG. 1 is a bottom view of an embodiment of a manhole with a lock according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a bottom view of the lid in the unlocked direction in the locked state in the embodiment of FIG.

FIG. 5 is a plan view of a manhole to which this embodiment is applied.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a sectional view of a conventional manhole covered with a cover.

FIG. 8 is a development view of the inner surface of the outer cylinder of the manhole shown in FIG.

[Explanation of symbols]

10 ... Lid 12 ... Disc 14 ... Fitting cylinder 18: Handle bar 19: Locking hole 22 ... Fixed locking member 24 ・ ・ ・ ・ ・ Receiving frame 26 ... Outer cylinder 28 ... Receiving groove 30 ... packing 32 ... Inner cylinder 34 ... Pedestal 36 ... Stop wall 38 ... Locking plate 40 ... Movable locking member mounting plate 42 ... through hole 44 ... Nut 46 ... Rotation axis 48 ... Engaging protrusion 50 ... Movable locking member 52 ... Regulation member 54 ... Locking wall 56 ・ ・ ・ Round seat 58 ... Protrusion 60 ... Vertical groove 62 ... Horizontal groove

Claims (2)

(57) [Claims] 1. A lid (10) comprising a disk (12) having a fitting tube (14) provided upright on the lower surface of the outer periphery, an outer tube (26) into which the disk (10) is fitted, and the outer tube. A receiving groove (2) inside the (26) into which the fitting cylinder (14) is fitted.
8) and the disc (1) provided upright inside the receiving groove (28).
A manhole consisting of a receiving frame (24) having an inner cylinder (32) for supporting 2) from the back side, and at least two fixed length locks having a stop wall (36) suspended from the lower surface at one end. A plate (38) is horizontally projected on the inner peripheral surface of the inner cylinder (32) of the receiving frame (24), and is located below the locking plate (38) and closes to the stop wall (36) when closed. Fixed locking members (2) corresponding to the respective locking plates (38) in phase with the locking plates (38) at the height of contact.
2) is fixed to the back surface of the lid (10), and the lid (10) is fixed.
When it is rotated in the locking direction of the lid (10), it is locked in the normal direction of the lid (10) and the tip projects toward the inner cylinder (32) of the receiving frame (24) in the direction opposite to the locking direction of the lid (10). One end of a movable locking member (50) having a rotation restricting member (52) that locks in a tangential direction of the lid (10) when rotated is attached to the back surface of the lid (10) so as to be horizontally rotatable from the surface, The movable locking member (50) is rotatable in the locking position where the fixed locking member (22) of the lid (10) abuts the stop wall (36) of the locking plate (38). When the lid (10) is rotated in the unlocking direction, the fixed locking member (22) and the locking plate (38) vertically oppose each other in the locked state and in the normal direction of the lid (10). The movable locking member (50) that is locked and has its tip protruding toward the inner cylinder is Locking device with a manhole, characterized in that projecting from the inner peripheral surface of the inner cylinder of the lock wall (54) in contact. 2. A fitting cylinder (14) provided upright on the lower surface of the outer peripheral portion.
(10) consisting of a disc (12) having an outer ring, and an outer cylinder (26) having an annular seat (56) into which the disc (12) is fitted and which supports the lower surface of the outer edge of the disc (12). And a receiving groove (28) inside the outer cylinder (26) into which the fitting cylinder (14) is fitted, and the disc (12) standing upright inside the receiving groove (28) from the back surface. And a receiving frame (24) having an inner cylinder (32), and at least two protrusions (58) contacting the annular seat (56) on the outer surface of the fitting cylinder (14). And the protrusion (58) is inserted into the annular receiving seat (56) and the disc (12) is mounted on the annular receiving seat (56) with a vertical groove (60) having a depth. 58) in phase with
A protrusion (58) is inserted into the side surface of the vertical groove (60) so that the disc (12) can be rotated and locked while being placed on the annular seat (56), and the protrusion (58) is horizontally moved. When the lateral groove (62) is made to communicate and is rotated in the locking direction of the lid (10), it is locked in the normal direction of the lid (10) and the tip is directed toward the inner cylinder (32) of the receiving frame (10). When one end of a movable locking member (50) having a rotation restricting member (52) that protrudes and rotates in a direction opposite to the locking direction of the lid (10) is locked in the tangential direction of the lid (10), the lid (10) is provided. ) Is attached to the back surface of the lid so as to be horizontally rotatable from the front surface,
The movable locking member (50) is rotatable at the locking position where the protrusion (58) of (0) abuts the tip of the lateral groove (62), and the protrusion when the lid is rotated in the unlocking direction. A locking wall (54) with which a movable locking member (50), which is locked in a normal direction of the lid and has a tip projecting toward the receiving frame, abuts at a position in a locked state in the lateral groove.
A manhole with a locking device, wherein the manhole is provided on the inner peripheral surface of the inner cylinder (32).