JP3111253B2 - Rectangular manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular manhole installed on a sidewalk or a road.

[0002]

2. Description of the Related Art Conventionally, manholes of various shapes are provided at openings on the ground surface which communicate with an underground space for providing electric wires, gas pipes, sewers, etc. A rectangular (for example, rectangular) manhole is installed in a case where a length pipe or the like must be introduced or in an opening such as a common groove.

[0003] The lid of such a rectangular manhole is generally larger and heavier than a circular manhole due to the introduction of a long pipe. Therefore, in order to easily open and close the lid, a rectangular manhole in which wheels are provided below the lid body and rails are provided in a frame body in which the lid body is fitted is known. Such a rectangular manhole lifts one side of the lid body, tilts the lid body with the wheel as a fulcrum, and the wheels roll on the rail by being pulled out in that state,
The lid can be opened with relatively little force.On the other hand, when closing the lid, comparison is made by lifting one side of the lid body, placing the wheel on the rail, pushing back the lid body and rolling the wheel The lid can be closed with very little force.

[0004] The drawer-type rectangular manhole of the related art has a problem in that the lid body and the frame are not fitted in a state of close contact, and thus are less airtight than a circular manhole. Was. In order to solve such a problem, there is a means of providing a rubber packing, but the rubber packing eventually deteriorates. In consideration of this point, like a circular manhole, the peripheral portion of the lid body is a tapered tapered surface whose diameter is reduced downward, and the peripheral portion of the frame body can be brought into contact with the peripheral portion of the lid body. The tapered surface is preferable because the lid body and the frame come into surface contact with each other and airtightness can be secured.

[0005]

However, in a rectangular manhole having a tapered peripheral edge as described above, the width of the upper surface of the lid body is reduced because the peripheral edge is formed in a tapered shape. However, when the lid is pushed back to close the lid, the peripheral edge of the lid main body interferes with the peripheral edge of the frame, and the lid cannot be closed smoothly. Produces a point.

[0006] Specifically, as shown in FIG.
When pushing back 0, the lid body 30 is in a tilted state, but in such a state, the side on which the wheel 31 is provided (one side 30a) is slightly lowered from the peripheral upper end surface 32c of the frame 32, Accordingly, the upper end edges 30b, 30b of the two corners of the one side 30a of the lid body 30 hit near the middle portion 32b of the peripheral edge 32a of the frame 32 and interfere therewith (the lid body 30).
And the peripheral portion 32a of the frame body 32 are formed in a tapered shape having the same inclination angle.
0, the length between the upper edges 30b, 30b of the two corners is
Is longer than the length between the middle portions 32b, 32b of the peripheral portion 32a). Accordingly, there arises a problem that the lid body 30 interferes with the frame body 32 and the wheels 31 move away from the rails 33 during movement, so that the lid body 30 cannot be closed smoothly.

Further, as shown in FIG. 10, the opened lid body 30 is usually placed on the ground surface 35, so that the wheels 31 and the rails 33 are separated from each other. When closing 30, the wheel 31 must be put on the rail 33. However, since the position of the placed lid body 30 is shifted, the lid body 30
The wheel 31 may not ride on the rail 33 simply by pulling up and pushing back.

In view of the above, an object of the present invention is to provide a rectangular manhole which can secure airtightness structurally and can easily and reliably close the lid. Specifically, it is an object of the present invention to provide a rectangular manhole that can secure airtightness structurally and that does not easily interfere with the frame when the lid is closed. Further, it is another object of the present invention to provide a rectangular manhole in which a wheel provided on a lid body can surely ride on a rail when the lid is closed.

[0009]

Means for solving the above problems are as follows. As means for solving the above problems, a rectangular lid body 2 provided with wheels 6; a frame body 3 into which the lid body 2 is fitted; A rail 8 is formed so that the wheel 6 of the lid body 2 rolls and is inclined upward in the pulling direction of the lid body 2, and the lid body 2 is pulled out of the frame 3 by the rolling of the wheel 6. A tapered surface 5 which is a rectangular manhole and which can be brought into contact with the peripheral portion 3a of the frame 3 which is formed in a tapered shape whose diameter is reduced downward is formed in the peripheral portion 2a of the lid main body 2. At the same time, the frame 3 is provided with a wheel accommodating portion 14 for accommodating the fitted wheel 6 of the lid body 2, and the rail 8
Is formed to be steeper than other portions in the vicinity of the wheel storage portion 14, and the wheel 6 is connected to one side of the lid main body 2.
The wheel housing 1
4 is provided so as to bulge outwardly below the peripheral portion of the frame 3.
Lies in the fact that. Further, an engagement portion 9 that engages with the rail 8 may be provided when the lid body 2 is opened and placed on the ground surface 13.

According to such a rectangular manhole, the wheel 6
The rail 8 on which the wheel 6 rolls is a wheel accommodating portion 14 in which the wheel 6 fits.
At the vicinity of the wheel accommodating portion 14, the vertical movement of the wheel 6 is large at the vicinity of the wheel accommodating portion 14 because the inclination is formed steeper than the other portions at the vicinity. That is, when the lid body 2 is pushed back, the wheel 6 keeps a high position on the rail 8 and falls sharply near the vicinity of the wheel accommodating portion 14. Therefore, when the lid body 2 is pushed back, the upper end surface of the lid body 2 However, it moves while maintaining a position higher than the upper end surface of the frame 3, so that the peripheral edge 2 a of the lid main body 2 is less likely to interfere with the peripheral edge 3 a of the frame 3.

Further, the wheel 6 is provided so as to protrude outward from one side of the lid body 2 and the wheel accommodating portion 14 is provided.
Is provided so as to protrude outwardly below the peripheral portion of the frame body 3, when the lid body 2 is fitted to the frame body 3, the wheels 6 housed in the wheel housing portions 14 are attached to the frame body 3. 3 and is preferable because the lid main body 2 does not come off the frame 3 accidentally.

It is preferable that the inclination angle α of the rail 8 in the vicinity of the wheel accommodating portion 14 is formed in a range of 25 degrees to 45 degrees.

As another solution, a rectangular lid main body 2 provided with wheels 6, a frame body 3 into which the lid main body 2 is fitted, and wheels 6 of the lid main body 2 roll. And a rail 8 formed to be inclined upward in the direction in which the lid main body 2 is pulled out, and wherein the lid main body 2 is pulled out of the frame 3 by rolling of the wheels 6, wherein the lid main body 2 is pulled out of the frame 3. 2
Is provided with an engaging portion 9 that engages with the rail 8 when it is opened and placed on the ground surface 13.

In the rectangular manhole provided with the engaging portion 9, the lid body 2 opened and placed on the ground surface 13 is engaged even if the wheel 6 is separated from the rail 8. Since the portion 9 is engaged with the rail 8, there is no possibility that the lid main body 2 will be displaced, and the wheel will surely ride on the rail when closing the lid.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rectangular manhole according to the present invention will be described with reference to the drawings.

1 to 3, reference numeral 1 denotes a rectangular body having a lid body 2 formed in a planar rectangular shape (eg, a rectangular shape) and a frame body 3 into which the lid body 2 is fitted. 2 shows a shape manhole.

More specifically, the lid body 2 is formed in a plane rectangular shape (for example, a rectangular shape), and its peripheral edge 2 is formed.
On a, a tapered surface 5 having a tapered shape whose diameter is reduced downward is formed. Further, a pair of rotatable wheels 6 and 6 are provided at both corners on one side 2b (for example, one short side) of the lid body 2. These wheels 6, 6 are located outside one side 2 b of the lid body 2 via the bracket 7 (the lid body 2
Outside of the push-back direction).

As shown also in FIG. 4, the wheels 6
A rolling portion 6a that rolls on the upper surface 8a of the rail 8 and a flange portion 6b that is locked to one side surface 8b (for example, the inner side surface 8b) of the rail 8 are provided. Inadvertent dropping of the wheel 6 from the rail 8 during rolling can be prevented.

The bracket 7 is provided with an engaging portion 9 for engaging with the other side surface 8c (for example, the outer side surface 8c) of the rail 8. The engaging portion 9 is a protruding portion projecting downward from the bracket 7, protruding below the wheel 6, and coming into contact with (or near) the other side surface 8 c of the rail 8. Therefore, the wheel 6 rolls on the rail 8 in a state where the rail 8 is sandwiched between the flange 6 b and the engaging portion 9.

Further, as shown in FIGS. 5 and 6, the engaging portion 9 is provided on the upper surface of the rail 8 even when the lid main body 2 is opened from the frame 3 and placed on the ground surface 13. The rail 8 is configured to protrude below the lower side 8a and engage with the other side surface 8c of the rail 8. That is, the opened lid body 2 is
While the wheel 6 and the flange 6b are separated from the rail 8 in the state of being placed on the rail 3, the engagement portion 9 maintains the engagement with the rail 8.

On the other hand, a key portion 10 which can be engaged with and disengaged from the frame 3 is provided substantially at the center of the other side 2c (for example, the other short side) of the lid body 2 as shown in FIG. ing. The key portion 10 has a key piece 10a that is rotatable by fitting a key member, and is locked by the locked portion 11 of the frame 3 by rotating the key piece 10a.

The frame body 3 has a frame shape which can be installed in an opening excavated on the ground surface 13 such as a road, and has a tapered surface 12 having a tapered surface 12 whose diameter is reduced downward at an inner peripheral edge 3a.
Is formed, and the tapered surface 5 of the lid body 2 comes into contact with the tapered surface 12 of the frame body 3 by fitting the lid body 2 to the frame body 3. When the lid main body 2 is fitted into the frame 3, the two are surface-joined at their peripheral edges to maintain airtightness, thereby preventing water, dust and the like from entering the opening.

The frame 3 is provided with a wheel accommodating portion 14 for accommodating the wheels 6 protruding from the lid body 2.

Specifically, the wheel accommodating portion 14 is formed below the peripheral portion 3a of the frame 3 and bulging outward. Since the wheel 6 protruding from the lid body 2 is accommodated in the wheel accommodating portion 14, even when a force for lifting the lid body 2 acts when the lid body 2 is fitted to the frame 3. The wheel 6 is locked below the peripheral edge 3 a of the frame 3, and a key portion 10 is provided on the other side 2 c side of the lid body 2. The lid 6 is locked to the frame 3 by the wheels 6, so that there is no fear that the lid body 2 will come off even if, for example, an upward airflow is generated from the inside and the lower surface of the lid body 2 is pressed.

The tapered surface 12 of the frame 3 is located on both sides 3b, 3b (for example, both long sides) of the frame 3.
The rails 8, 8 are provided on the lower side as rolling paths on which the wheels 6, 6 can roll. Such a rail 8
The lid 8 is formed so as to be inclined upward in the direction in which the lid body 2 is pulled out. In particular, a part of the rail 8 is located at a position near the wheel accommodating part 14 and has a steep part 15 inclined more steeply than other parts. Is formed.

Specifically, as shown in FIG. 3, the angle α of the steep portion 15 is formed to be about 30 degrees with respect to the horizontal plane 18. The angle β of the other portion of the rail 8 (the gentle slope portion 16) is formed at about 5 degrees with respect to the horizontal plane.
If the angle α of the steep part 15 is too large, it is not preferable because the step becomes between the gentle part 16 of the rail 8 and the wheel accommodating part 14. On the other hand, if the angle α is too small, the wheel 6 The wheel 6 is lowered shortly before reaching the accommodating portion 14, so that the upper end surface of the lid main body 2 is lower than the upper end surface of the frame 3, so that when the lid main body 2 moves, the peripheral portion 2 of the lid main body 2 moves.
a may interfere with the peripheral portion 3a of the frame 3, which is not preferable.

In consideration of this point, the angle α of the steep portion 15 is preferably set in the range of 25 to 45 degrees, more preferably, in the range of 30 to 40 degrees. Slow gradient part 1
6 is appropriately changed according to the moving distance (length) of the lid body 2, but is generally in a range of about 0 to 8 degrees,
It is preferable to set the angle in the range of degrees to 5 degrees because the pulling force can be uniformly dispersed when the lid body 2 is pulled out.

In the rectangular manhole having the above-described structure, for example, the connecting rod 20 of the arm 19 of the opening / closing handle is locked in a locking hole 18 provided in the center of the other side 2c of the lid main body 2. By pulling out the lid main body 2 via the opening / closing handle, the wheels 6 located in the wheel housing portions 14
Riding on the rails 8 and rolling on the rails 8
Is easily pulled out, and the opening of the frame 3 is opened.

On the other hand, when closing the opening by pushing back the pulled-out lid body 2, the lid body 2 is moved in the reverse procedure. At this time, the lid body 2 opened and placed on the ground surface 13 has the wheels 6 and the flange 6b separated from the rail 8 as shown in FIG. Since the rolling portion 6a of the wheel 6 and the upper surface 8a of the rail 8 are not in contact with (or close to) the other side surface 8c, there is no risk of displacement.
Rides on rail 8.

In this state, when the lid body 2 is pushed back, the wheels 6 roll on the rails 8 and the lid body 2 moves.

At this time, since the rail 8 is formed as a steep portion 15 near the wheel accommodating portion 14, FIG.
As shown in (a), the wheels 6 rolling on the rails 8
The roller body 2 rolls on the gentle slope 16 of the rail 8 to a position close to the wheel housing 14, so that the wheel housing 14
Is moved in a state where the upper end surface of the lid body 2 protrudes upward from the upper end surface of the frame body 3 until the space is stored.

When the wheel 6 reaches a position near the wheel accommodating portion 14, the wheel 6 moves along the steep portion 15 of the rail 8.
Drops sharply (shown in (b) of FIG. 8), and the lid body 2 is fitted into the frame 3 at the same time that the wheel 6 is housed in the wheel housing portion 14 (the state shown in FIG. 3). Therefore, the lid body 2
Is moved and fitted to the frame 3, the peripheral edge 2 a of the lid body 2 does not interfere with the peripheral edge 3 a of the frame 3.

When the cover main body 2 is fitted to the frame 3, the wheels 6 are housed in a state slightly separated from the bottom surface 14a of the wheel housing 14. With this configuration, there is an advantage that the wheel 6 does not receive the load of the lid main body 2 and the wheel 6 is hardly damaged.

In the above embodiment, the engaging portion 9 is
The engaging portion 9 is not limited to such a configuration, but includes a projecting portion that can abut (or approach) the side surface of the rail 8. For example, the engaging portion 9 moves back and forth along the gradient of the rail 8 by a biasing means such as a spring. An engaging portion 9 or the like that is possible and can be unevenly locked to the rail 8 may be used. In short, the lid body 2 is
Any configuration may be used as long as it can engage with the rail 8 in a state where it is placed on the rail.

Further, the above-described embodiment is merely an example, and the specific configuration can be appropriately changed within the range intended by the present invention.

[0036]

According to the rectangular manhole according to the present invention, since the lid body and the frame are fitted on the tapered surface, the airtightness can be ensured structurally without using packing or the like.

Further, when the lid body is closed, the lid body can be smoothly moved via the wheels and fitted to the frame without interfering with the frame.

According to the rectangular manhole according to the third aspect , when closing the opened lid, the wheels provided on the lid main body can be reliably mounted on the rail.
The closure of the lid can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a rectangular manhole according to the present invention.

FIG. 2 is a sectional view taken along line AA (vertical direction) of FIG.

FIG. 3 is an enlarged view showing a portion encircled by B in FIG. 2;

FIG. 4 is a partially omitted cross section showing the relationship between wheels and rails.

FIG. 5A is a partially omitted vertical cross-sectional view showing a state in which the opened lid body is placed on the ground surface, and FIG.
FIG.

FIG. 6 is a cross-sectional view partially cut along the line BB of FIG.

FIG. 7 is a partially omitted cross-sectional view showing a key portion.

FIGS. 8A and 8B are partially omitted cross-sectional views showing a state when the lid main body is fitted to the frame body.

9A and 9B show a conventional rectangular manhole, in which FIG. 9A is a longitudinal sectional view, and FIG. 9B is a partially omitted sectional view taken along line CC of FIG. 9A.

FIG. 10 is a longitudinal sectional view showing a state in which a lid body of a conventional rectangular manhole is opened and placed on the ground surface.

[Description of Signs] 2 ... Lid body, 2a ... Peripheral part of lid body, 3 ... Frame, 3a ...
Peripheral part of frame, 5 ... tapered surface of lid body, 6 ... wheel, 8 ...
Rails, 9: engagement part, 13: ground surface, 14: wheel storage part

Claims (3)

(57) [Claims] 1. A rectangular lid body (2) provided with wheels (6), a frame body (3) into which the lid body (2) fits,
A rail (8) formed by rolling a wheel (6) of the lid body (2) and inclining upward in a direction in which the lid body (2) is pulled out; and rolling the wheel (6). Is a rectangular manhole from which the lid body (2) is pulled out from the frame body (3), and a frame formed in a peripheral portion (2a) of the lid body (2) in a tapered shape whose diameter is reduced downward. The body (3) has a tapered surface (5) that can be brought into contact with a peripheral portion (3a), and the frame (3) is fitted with wheels (6) of a lid body (2). Is provided, and the rail (8) is provided with the wheel storage portion (1).
4) In the vicinity position, it is formed steeper than the other parts, and the wheel (6) is positioned more than one side of the lid body (2).
The wheel receiving portion (14) provided so as to protrude outward.
Is provided so as to bulge outwardly below the peripheral portion of the frame (3).
Rectangular manhole, characterized in that they are. 2. The wheel receiving portion (14) of the rail (8).
The inclination angle (α) in the vicinity position is 25 degrees to 45 degrees.
The rectangular manhole according to claim 1, wherein the rectangular manhole is formed in the area . 3. A rectangular lid body provided with wheels (6).
(2) a frame body (3) into which the lid body (2) fits;
The wheel (6) of the lid body (2) rolls and the lid body
(2) Rail formed so as to be inclined upward in the drawing direction
(8), and the lid body is formed by rolling of the wheel (6).
(2) Rectangular manhole pulled out from frame (3)
The lid body (2) is opened and the ground surface (1
Engage with the rail (8) when placed on 3)
Characterized by being provided with an engaging portion (9) that
Shape manhole.