JP2002121758A - Locking device of lid for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a locking condition cannot be maintained only by the self weight of a weight when a conventional locking structure is subjected to abrupt turbulence uplift, and to prevent a lid for an underground structure from being installed on a road surface in an unlocked condition when it is installed on an inclined road surface. SOLUTION: When a hook body 8 is in its locking position, a hook stopper 12 regulates the hook body 8 to be rotated in the unlocking direction. This locking device of the lid for the underground structure comprises a twist hole 3 which is also used for a key hole having a key part 4 and a bottom plate part 5, a hook fitting part 6, the hook body 8, the hook stopper 12, a projection part 16, an unlocking guide 19, a hinge 20 and a hinge bearing 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for locking a lid for an underground structure such as a manhole.

[0002]

2. Description of the Related Art A conventional lid for an underground structure comprises a receiving frame installed at the upper end of the underground structure and a lid supported by taper fitting or the like, and this lid is hinged to the receiving frame. A hook and a weight are provided on the rear surface of the lid so as to swing and engage with the inner peripheral surface of the receiving frame (Japanese Utility Model Publication No. 58-3892, Japanese Utility Model Publication No. 7-15880).
No.).

[0003]

However, the conventional locking structure described in the above publication intends to maintain the locked state mainly by the weight of the weight itself.
For example, when an air hammer or water hammer phenomenon occurs in an underground structure and sudden turbulent lifting pressure is applied, the locked state cannot be maintained with the weight of the weight alone, and the hook swings in the unlocking direction. It may move and the lid may open. In addition, when the lid for the underground structure is installed on an inclined road surface, the hook portion is maintained in an unlocked state depending on the direction of the inclination, so that the function as the locking structure may not be performed. .

The present invention provides a locking device for a lid for an underground structure, which always maintains a stable locked state even when a sudden turbulent lifting pressure or the like is generated in the underground structure, and does not come off even when installed on a slope. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a bag-shaped pocket hole 3 which is formed on the outer peripheral surface of a lid 1 and has a key portion 4 and a bottom plate portion 5 and also serves as a key hole. Kojiri hole 3
Axes 7 and 7 ', which are fixedly formed on the lower surface of the hook, and are provided with shaft holes 7, 7' to which the hook body 8 is rotatably mounted, and hooks provided with rotation stoppers A and B where the hook body 8 stops in a range from the position A to the position B. A hook unlocking guide 19 and a mounting portion 6, a shaft unlocked by the hook mounting portion 6, a shaft hole 9 at substantially the center, and an upper surface which is locked to the lower surface of the hook stopper 12 at one of both sides of the shaft hole 9.
A hook body 8 having an engaging portion 10 provided with a side surface which is turned upside down in contact with a hook, and a locking upper surface 11 which is locked to the B surface of the hook mounting portion 6 on the other side of the shaft hole 9; 1 is mounted on the inner periphery of the receiving frame 2 by the support shafts 13 and 13 ', and is stopped by the locking portion 14 where the engaging portion 10 of the hook body 8 is locked. The rotation of the hook stopper 12 formed between the hook stopper 12 having the shaft hole 15 to be secured to the C plane, the D plane and the spindles 13, 13 ′, and the spindle 13, 13 ′ of the receiving frame 2. A projection 16 having a locking upper surface 17 and a locking lower surface 18 for stopping in a range from the position C to the position D, and the engaging portion 10 of the hook body 8 by rotating the lid 1
Is moved from the locking position E with the hook stopper 12, and the unlocking guide 19 for guiding to the unlocking position F and the hinge 20 pivotally supported by the lid 1 can be inserted, and the engaging portion 10 of the hook body 8 is locked. When the hinge 20 is located at the position E, the hinge 20 is located at the position E '.
The hinge 20 is provided with a hinge receiver 22 having an inclined surface 21 on which the hinge 20 slides when the lid 1 is opened and pulled up.

According to the present invention, as described above, when the hook body is in its locked position, the rotation of the hook body in the unlocking direction is restricted by hooking, so that the inside of the underground structure is restricted. Even when turbulent lifting pressure occurs, the hook body does not unlock and can always maintain a stable locked state, and even if installed on a slope, it does not unlock and always maintains a stable locked state be able to.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a closed state in which a lid is fitted to a receiving frame. In FIG. 1, a lid 1 and a receiving frame 2 are fitted by a tapered portion, and a locking structure is provided on one side, and a hinge structure is provided on the opposite side, so that the lid 1 can be locked on the receiving frame 2 by these structures.

FIG. 2 is a cross-sectional view of the lid portion of the locking structure and a side view of the hook body, and FIG. 3 is a perspective view thereof. As shown in FIGS. 2 and 3, a pocket lock hole 3 also serving as a key hole is formed in an outer peripheral surface portion of the lid 1, and a hook mounting portion 6 is fixed to a lower surface portion thereof. The hole 3 also serves as a key hole and has a key portion 4 with which a tip of a hand key (not shown) is engaged, and a bottom plate portion 5 which is opened only on the upper surface of the lid 1 and has a bag shape.

The hook mounting portion 6 is provided with a hook body 8 described later.
Shaft holes 7, 7 'which are rotatably mounted and a rotation stopper A which stops at an unlocking position (A position) when the rotation is opened.
It has a surface B that stops at the locking position (position B) when the lid is closed with the surface.

The hook body 8 has a shaft hole 9 substantially rotatably mounted on the hook mounting portion 6 and a hook stopper 1 to be described later when a lid floats on one of both sides of the shaft hole 9.
2 and an engagement upper surface 11 that engages with the surface B to lock the other side of the shaft hole 9 when the lid is closed.

FIG. 4 is a perspective view of the locking structure of the lid.
In FIG. 4, the hook body 8 is rotatably mounted between the shaft holes 7 and 7 'through a shaft hole 9 of the hook body 8 with bolts and locking nuts.

FIG. 5 is an explanatory view of the movement of the hook body. In FIG. 5, the rotation range B of the engagement portion 10 is set at an angle slightly upward from a horizontal line so that the engagement portion 10 can be firmly locked to the hook stopper 12 described later. When the cover 1 is fitted to the receiving frame 2, the position of the rotation range A
Is set at an angle of less than 90 ° from the horizon so as to automatically push the hook stopper 12 described later to reach the locking position.

FIG. 6 is a perspective view of a receiving frame having a locking structure.
FIG. 7 is a perspective view of the hook stopper. FIG. 8 is a perspective view showing a state where the hook stopper is attached to the receiving frame, and FIG. 9 is a sectional view thereof. FIG. 10 shows the movement of the hook stopper,
It is sectional drawing of the state stopped at the C position. FIG. 11 is a cross-sectional view showing the movement of the hook stopper and in a state of being stationary at the position D.

In FIGS. 6, 9, 10, and 11, supporting shafts 13 and 13 'for rotatably mounting a hook stopper 12 are provided on the inner periphery of a receiving frame 2 on which the lid 1 is placed.
Rotate the hook stopper 12 between C and D from D
A projection 16 having a locking upper surface 17 and a locking lower surface 18 for stopping at a position is provided. An unlocking guide 19 that guides the engaging portion 10 of the hook body 8 to the unlocking position (A position) by rotating the lid below the support shaft 13 is provided.

The unlocking guide 19 moves the upper front surface 23 to the tip 2 of the support shaft 13 so that the engaging portion 10 of the hook body 8 smoothly rotates to the unlocking position (A position) when the lid is rotated.
4 and a semi-truncated cone-shaped projection that is inclined toward the bottom.

As shown in FIGS. 7, 8, 9 and 11, the hook stopper 12 is provided with an engaging portion 14 for engaging the engaging portion 10 of the hook body 8 when the lid 1 floats, At this time, a rotation stop D surface which is locked to the locking upper surface of the projection 16 to stop the rotation, a rotation stop C surface which returns to the locked position when the lid 1 is fitted and closed, and a support shaft 13, A shaft hole 15 rotatably attached to 13 'is provided.

In FIG. 8, the hook stopper 12 is attached to the support shaft 1.
3, 3 'is rotatably mounted on both hook bolts and locking nuts through the shaft hole 15 of the hook stopper 12.

FIGS. 12, 13 and 14 are sectional views showing a series of movements of the locking structure when the lid is closed.
Is a cross-sectional view of the locked position when the lid is closed.

In FIG. 12, FIG. 13 and FIG.
When the lid 1 enters in the direction of the arrow when the cover is to be closed, the lower surface of the engaging portion 10 comes into contact with the head of the hook stopper 12 and the engaging portion 10 rotates upward.

When the lid 1 further enters, the engaging portion 10
It does not rotate any more in contact with the rotation stop A surface, but instead tries to push down the hook stopper by its own weight. When the cover 1 further enters, the engaging portion 10
And the locking upper surface 11 of the hook body 8 is locked to the rotation stop B surface to be in the locked position. On the other hand, in the hook stopper, the rotation stopper C surface is locked on the locking lower surface 18 of the projection 16 and returns to the locked position by its own weight without further rotation.

FIGS. 16 and 17 are cross-sectional views showing the movement of the locking structure when the lid 1 floats.

In FIGS. 16 and 17, when an internal pressure is applied to the lid 1 in the direction of the arrow, the engaging portion 10 of the hook body 8 rotates upward and engages with the engaging portion 14 of the hook stopper 12. . The hooking is stopped by the engagement of the engaging portion 10,
The rotation stop D surface is rotated upward and the locking surface 17 of the projection 16 is
To lock. When the internal pressure is further applied and the lid starts to float, the engaging portion 10 is pushed downward, but the locking upper surface 11 of the hook body 8 is locked to the rotation stop B surface, and the locked state is maintained without further lowering. This will prevent the surfacing.

FIG. 18 is a perspective view showing the movement of the engaging portion of the locking structure when the lid is opened. FIG. 19 is a sectional view of the hinge structure when the lid is closed, and FIG. 20 is a front view thereof. FIG. 20 is a cross-sectional view of the hinge structure when the lid is opened, and FIG. 21 is a front view of the same.

In FIGS. 18, 19, 20, and 21, when the engaging portion 10 of the hook body 8 is at the locking position E, the hinge 20 is at the E 'position and the hinge 28 engages with the hinge blade 28. Side wall 2 for stopping inward movement of joint 26 and hinge
7, the cover 1 does not open.

The cover 1 is rotated so that the engaging portion 1 of the hook body 8 is
When 0 moves to the unlock position F, the hinge 20 moves the wide socket 25 in the circumferential direction arrow to reach the F position. Hinge 2
When 0 is in the F 'position, the lid 1 can be opened by sliding in the inward direction along the inclined surface 21.

[0026]

According to the present invention, there is provided a bag-shaped knurled hole which also serves as a key hole on the outer peripheral surface of the lid, and a hook attachment portion is fixedly provided on the lower surface of the bag-shaped knurled hole. Is composed of a shaft hole rotatably mounted, and rotation stopping A surfaces and B surfaces for stopping rotation in the range of A to B, and the hook body is rotatably mounted on the hook mounting portion substantially at the center thereof. When the lid floats on one of the two sides, the upper surface is locked to the lower surface of the hook stopper, and when opening the lid, the engaging portion is provided with a side that is in contact with the hook unlocking guide and is turned upside down. On the other hand, the hook body is provided with a locking upper surface which comes into contact with the rotation stopper B surface of the hook mounting portion and sets the hook in the locking position. Therefore, when the hook body is in the locking position, the hook body is released by the hooking. It is restricted from rotating in the lock direction Even if turbulent lifting pressure occurs in the underground structure, the hook body will not be unlocked and can always maintain a stable locked state, and even if installed on a slope, it will not be unlocked and will always be stable The locked state can be maintained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a closed state.

FIG. 2 is a cross-sectional view of a lid of a locking structure and a side view of a hook body.

FIG. 3 is a perspective view of a lid of a locking structure and a perspective view of a hook body.

FIG. 4 is a perspective view of a locking structure of a lid.

FIG. 5 is an explanatory view of the movement of a hook body.

FIG. 6 is a perspective view of a receiving frame portion having a locking structure.

FIG. 7 is a perspective view of a hook stopper.

FIG. 8 is a perspective view showing a state where a hook stopper is attached to a receiving frame.

FIG. 9 is a sectional view showing a state where the hook stopper is attached to the receiving frame.

FIG. 10 is a cross-sectional view showing the movement of the hook stopper and showing a state of resting at a position C;

FIG. 11 is a cross-sectional view showing the movement of the hook stopper and showing a state of resting at a position D;

FIG. 12 is a sectional view showing a series of movements of the locking structure when closing the lid.

FIG. 13 is a sectional view showing a series of movements of the locking structure when closing the lid.

FIG. 14 is a sectional view showing a series of movements of the locking structure when the lid is closed.

FIG. 15 is a sectional view of a locked position when the lid is closed.

FIG. 16 is a sectional view showing the movement of the locking structure when the lid floats.

FIG. 17 is a cross-sectional view showing the movement of the locking structure when the lid floats.

FIG. 18 is a perspective view showing the movement of the engaging portion of the locking structure when the lid is opened.

FIG. 19 is a sectional view of the hinge structure when the lid is closed.

FIG. 20 is a front view of the hinge structure when the lid is closed.

FIG. 21 is a sectional view of the hinge structure when the lid is opened.

FIG. 22 is a front view of the hinge structure when the lid is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid 2 Receiving frame 3 Hole for double use as key hole 4 Key part 5 Bottom plate part 6 Hook attachment part 7, 7 'Shaft hole of hook attachment part 8 Hook body 9 Hook body of hook body 10 Hook body engagement part 11 Hook Locking upper surface of main body 12 Hook stopper 13, 13 ′ Spindle 14 Locking portion of hook locking 15 Shaft hole of hook locking 16 Projection 17 Upper locking surface of projection 18 Lower locking surface of projection 19 Unlocking guide 20 Hinge DESCRIPTION OF SYMBOLS 21 Slope of hinge catch 22 Hinge catch 23 Top front of unlocking guide 24 Tip of spindle 13 25 Wide catch of hinge catch 26 Engagement edge of hinge catch 27 Side wall of hinge catch 28 Hinge blade A surface Hook attachment portion Provided rotation stopper B surface Rotation stopper provided on hook mounting part C surface Rotation stopper provided on hook stopper D surface Rotation stopper provided on hook stopper E position Locking position of locking structure F position Unlocking position of lock structure E 'position Locking position of hinge structure F' position Unlocking position of hinge structure

Claims (3)

[Claims] A key portion (4) formed on an outer peripheral surface portion of a lid (1).
And a bag-shaped knurled hole 3 having a key hole and a bottom plate portion 5;
A shaft hole 7, which is fixedly formed on the lower surface of the bag-shaped knurled hole 3 also serving as a key hole, and to which the hook body 8 is rotatably attached.
7 'and a hook mounting portion 6 having a rotation stop A surface and a B surface at which the hook body 8 stops in a range from the position A to the position B; a shaft hole 9 and a shaft which are fixed at the center by the hook mounting portion 6; One side of the hole 9 is provided with an engaging portion 10 having an upper surface which is engaged with the lower surface of the hook stopper 12 and a side surface which is in contact with the hook unlocking guide 19 and is turned upward. A hook body 8 having a locking upper surface 11 for locking to the B surface of the portion 6, and a support shaft 1 on the inner periphery of the receiving frame 2 on which the lid 1 is mounted.
The engaging portion 1 of the hook body 8 is secured by the shafts 3 and 13 '.
A hook portion 12 having a locking portion 14 for locking 0 and a rotation stop C surface which stops in a range from the C position to the D position, a D surface, and a shaft hole 15 which is fixed to the support shafts 13 and 13 ′; Hook stopper 12 formed between support shafts 13 and 13 ′ of receiving frame 2.
Locking upper surface 1 that stops the rotation of C from position C to position D
7. Unlocking, in which the protrusion 16 having the locking lower surface 18 and the lid 1 are rotated to move the engaging portion 10 of the hook body 8 from the locked position E with the hook stopper 12 to the unlocked position F. Guide 1
9 and a hinge 20 pivotally supported by the lid 1 can be inserted. When the engaging portion 10 of the hook body 8 is in the locking position E, the hinge 2
0 is located at the E 'position, and when the engaging portion 10 of the hook body 8 is at the unlocking position F, the hinge 20 is located at the F' position and the inclined surface 21 on which the hinge 20 slides when the lid 1 is opened and pulled up. A locking device for a lid for an underground structure, comprising a hinge receiver 22 provided with a hinge. 2. The unlocking guide 19 is a semi-truncated cone-shaped projection which is formed below the support shaft 13 and whose upper front surface 23 is substantially the same as the tip end 24 of the support shaft 13 and which protrudes and slopes downward. The locking device for an underground structure lid according to claim 1. 3. The hinge receiver 22 is formed on the inner periphery of the receiving frame 2,
Hook stopper 12 is screwed, oppositely located, wide receiving opening 25 allowing hinge 20 to move, and engaging edge at which hinge 20 is in locking position E 'and lid 1 floats and engages. 2
6. The underground structure lid locking device according to claim 1, further comprising a side wall for stopping the inward movement of the hinge when the hinge is in the locking position.