JPH0892985A - Opening and closing structure of cover of manhole, etc. - Google Patents

Abstract

PURPOSE: To make it possible to open and close an cover of a manhole simply by less strength without giving any damage to the cover. CONSTITUTION: Opening and closing construction of a cover of a manhole is constituted of an external frame 1 provided to an opening of the manhole, etc., the cover 23 with a wheel 25 for opening and closing an entrance hole 2 bored in the center of the external frame and a rail 4 installed in parallel with the inside opposed to the entrance hole bearing the cover through the wheel. Two bearings 9 provided to the rail and two bearings 11 fixed to the external frame are connected with two links 10 in a turnable manner so as to from a parallelogram and, at the same time, the ends of a conductor 12 are respectively pivoted on the center positions of two links in a revolvable manner. A lifting screw bar 16 is erected in a slot 14 of the conductor and, at the same time, a lifting body 20 loading a cam follower 22 is screwed in the lifting screw bar to load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for opening and closing a lid such as a manhole provided in an intermediate part such as a common groove or an underdrain through which a power line, a telephone line, a water supply pipe or the like is inserted.

[0002]

2. Description of the Related Art In a manhole cover opening / closing structure, as shown in FIG. 9, a cast iron outer frame 1 fitted in an opening K of a manhole M and a hole 2 formed in the center thereof are opened. A structure having a closed cast iron manhole cover 3, and the manhole cover 3 being rotatably connected to the inside of the hole 2 through a hinge 4; As shown in FIG. 3, the manhole M is provided with a hole 2 made of cast-in-place concrete, and the anchor bolt 5 erected inside the hole 2 is engaged with the hinge metal fitting 6 mounted on the manhole cover 3. , A cast iron lid 3 is configured so as to be rotatable with respect to the hole 2. When the manhole cover 3 is opened and closed, an opening / closing jig is used to lift one end of the manhole manually.

[0003]

As described above, the lid 3 of the manhole M is opened / closed by manually lifting it using an opening / closing jig, but the total weight of the lid 3 of the manhole M is If the external dimensions are 400mm x 800mm,
The total weight of the manhole M including the flat plate block and the interlocking block 7 stretched on the upper surface of the lid 3 is about 120 kg. Therefore, if you open it by hand,
A force of about 0 kg to 80 kg is required, and when the lid 3 is opened, the reaction force is taken by the ground, so it can be managed, but especially when the lid 3 is closed, it is pulled downward by the lid 3 of the heavy manhole, so it is actually closed. Looking at it, a considerable force is required to lower the lid 3 while supporting it. At that time, there is a risk of pinching a foot or the like.

Immediately before the cover 3 of the manhole M closes the entrance 2, the weight of the cover 3 of the manhole M causes it to fall, so that a considerable impact is applied to the cover 3 of the manhole M. Therefore, the block 7 stretched on the upper surface of the lid 3 of the manhole M may be peeled off or may be a cause of cracks in the block 7 or the lid 3. Once the block 7 is peeled or cracked, it often happens that the block 7 or the like falls off during the opening. For this repair, the block 7 of the manhole cover 3 must be completely removed before the new block is removed. Since 7 cannot be mounted, there is a problem that it takes a considerable amount of time.

Further, if dust, earth and sand, etc. are contained in the fitting portion between the inlet 2 and the manhole cover 3, a large force is required to open the cover 3 and a large force is required. Inevitably the opening work is very difficult. Further, in the case of FIG. 10, a large amount of “misalignment” occurs when the entry hole 2 is formed by on-site construction, requires skill in construction, and especially when there is a slope on the ground on which the manhole M is constructed. There is a problem that it is difficult.

[0006]

The present invention has been made to solve the above-mentioned conventional problems, and can be opened and closed easily with a small force and without damaging a lid such as a manhole. The purpose of the present invention is to provide a workable product, and the gist thereof is an outer frame attached to an opening of a manhole or the like, and a lid with wheels for opening and closing a hole formed in the center of the outer frame. And two rails, each of which is installed in parallel with each other on the inner side surfaces of the entrance hole, which support the lid via the wheel, and which face each other, and the rails are spaced from each other in the longitudinal direction. When two bearings fixed to the outer frame are rotatably connected by two links so as to form a parallelogram, the ends of the transmission body are respectively located at the central positions of the two links. Part is rotatably pivoted, and the upper end is a lid inserted into the elongated hole of the transmission body. When the elevating screw rod rotatably supported by the bearing portion whose lower end is fixed to the outer frame is erected, the elevating body with the cam follower attached to the elevating screw rod is screwed and mounted. , A rotation restricting member attached to the elevating body is installed in the elongated hole of the transmission body, and the cam follower is in a position in contact with the lower surface of the transmission body, and the elevating and lowering is performed by a jig rod inserted from an insertion hole of the lid. By rotating the screw rod for vertical movement of the elevating body, the rails can be moved up and down with the lids on the rails, and when the rails are raised, the lids are moved horizontally to open and close the entrance portion. It is an opening / closing structure for a lid such as a manhole, which is characterized in that

[0007]

The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 to 8 in which the present invention is applied to a manhole cover. In addition,
FIG. 1 is a schematic perspective view showing the opened state of the manhole cover,
2 is a plan view of the same open state, FIG. 3 is an exploded perspective view of the rail elevating mechanism, FIG. 4 is an assembled perspective view of the same rail elevating mechanism, and FIG. 5 is a vertical cross section when the manhole cover is in the closed state. In the figure,
6 is a vertical cross-sectional view showing the first process when opening the manhole cover, FIG. 7 is a vertical cross-sectional view showing the second process, and FIG. 8 is a vertical cross-sectional view showing a state where the manhole cover is completely opened. Is.

In the figure, reference numeral 1 denotes an outer frame which is installed by fitting into an opening of a manhole and is formed in a rectangular shape in a plan view by a casting or the like, and an entrance portion 2 having a rectangular shape in a plan view is formed in the center thereof. As a result, a pair of left and right rails 4 and 4 are installed in parallel on the inner side surfaces 3 and 3 of the entrance hole 2 that face each other. In the figure, 5A is a reinforcing rib formed in a lattice shape, and 5B is a flat plate block or an interlocking block stretched on the upper surface of the outer frame 1.

As shown in FIGS. 3 and 4, the rail 4 has a prismatic stopper 6 standing upright at one longitudinal end of the rail surface 4A and an outlet 7 at the other end.
Further, a guide rail 8 is provided upright on one side edge of the rail surface 4A along the longitudinal direction, and on the back surface of the rail 4 there are two bearings 9, 9 spaced apart in the longitudinal direction. The shaft holes 9a of the two bearings 9, 9 are formed such that their axes are orthogonal to the longitudinal direction of the rail 4.

Further, on the side opposite to the guide rail 8, one end 10a of a link 10 having the same length is pivotally attached to the shaft hole 9a of the bearing 9 so as to be rotatable. The other end 10b is pivotally attached to a bearing 11 fixed to the back surface of the outer frame 1. As a result, the pair of rails 4 and 4 are arranged in parallel to the opposing inner side surfaces 3 and 3 of the entrance hole 2, respectively, and the outer frame 1 and the two links 10 and 10 are arranged. Since the rail 4 and the rail 4 form a parallelogram, the rails 4 and 4 are installed so that the rail surfaces 4A and 4A always move horizontally with respect to the outer frame 1 and move up and down in the vertical direction. ing.

Reference numeral 12 is a rectangular parallelepiped transmission body, and its front and rear ends in the longitudinal direction have arms 13, 13 inclined downward, respectively.
Is extended and the end portions 13a of the arms 13 and 13 are extended.
Is a pivot 10 projecting at the center of the links 10, 10.
Each of them is rotatably attached to c and is arranged in parallel with the rail 4. In addition, the transmission body 12 has an elongated hole 1 of a predetermined length parallel to the longitudinal direction of the rail 4.
4 is formed so as to penetrate vertically, and a rail elevating mechanism 15 is provided at the position of the elongated hole 14 of the transmission body 12, as shown in FIGS. 3 and 4. That is,
In the figure, 16 is an up-and-down screw rod, and a socket 18 for fitting with the lower end of a T-shaped jig rod 17 is formed on the top of the rod, while the lower portion is the back surface of the outer frame 1. It is rotatably inserted into a plate-shaped bearing portion 19 fixed to the upright position.

An elevating body 20 is rotatably engaged with the elevating screw rod 16 at a lower portion of the transmission body 12, and the shaft of the elevating screw rod 16 is mounted on the upper surface of the elevating body 20. Before and after the straight line passing through the heart, the long holes 14 of the transmission body 12
A pair of rotation restricting cylindrical elements 2 movably inserted in the
1, 21 are upright. The two spaced apart columnar members 21 and 21 are for moving up and down only in the vertical direction without rotating the lifting body 20 when the lifting screw rod 16 rotates. A cam follower 22 is provided on a side surface of the elevating body 20 for coming into contact with the lower surface of the transmission body 12 and sliding the rail 4 to ascend.

Reference numeral 23 denotes a manhole lid which opens and closes the entrance 2 and is made of a casting or the like like the outer frame 1 and has a lattice-like reinforcing rib 24A formed on the back surface thereof. On the other hand, a flat plate block or an interlocking block 24B is stretched on the upper surface. Then, on the back surface of the manhole cover 23, small wheels 25 are rotatably fixed at left and right front and rear positions corresponding to the rail surface 4A. Also, the manhole cover 2
In FIG. 3, there is formed an insertion hole 26 into which the jig rod 17 is inserted at a position corresponding to the axis line of the lifting screw rod 16 when the manhole cover 23 closes the inlet hole portion 2. Anyway,
When the inlet 2 is closed, it is closed by a cap 27 to prevent dust and the like from entering through the insertion hole 26.

Next, to explain the operation of opening the lid 23 of the manhole which closes the inlet portion 2, first, as shown in FIGS. 5 and 6, the lid 2 of the manhole is shown.
After removing the cap 27 closing the insertion hole 26 of No. 3, the jig rod 17 is inserted into the insertion hole 26 and the tip thereof is fitted into the socket 18 formed on the head of the lifting screw rod 16. To do. Then, the jig rod 17 is rotated in the direction in which the elevating body 20 is raised to rotate the elevating screw rod 16 in the same direction.
Without rotating by the two columnar elements 21 and 21 inserted therein, the screw rod 16 for raising and lowering is raised, and the transmission body 12 is pushed up by the cam follower 22 attached to the raising and lowering body 20.

Thus, each arm 13 of the transmission body 12,
13 also rises, the end 13a of the arm 13 and the pivot 10c
The links 10 and 10 pivotally attached to each other also receive a force in a rising direction. As a result, the links 10 and 10 respectively rotate clockwise around the bearing 11 fixed to the outer frame 1, and the rails pivotally rotatably attached to the one end 10a of the links 10 and 10 and the bearing 9. 4 also moves forward while moving up by the rotating link 10. And rail 4
Rises while advancing until the outlet 7 of the rail 4 hits the inner surface 3a of the outer frame 1 within the margin of the slot 14. During this time, since the manhole cover 23 placed on the rail surface 4A via the small wheels 25 is in contact with the inner side surface 3a of the outer frame 1, the manhole cover 23 is in a fixed position without moving. Only the rail 4 moves forward in the right direction in the figure. Therefore, the lid 23 on the rail surface 4A moves relatively leftward on the rail surface 4A until the rear small wheel 25 comes into contact with the stopper 6, and ascends as the rail 4 moves up.

Then, as shown in FIG. 7, the links 10,
When 10 rises, the outlet 7 end of the rail 4 abuts the inner side surface 3a of the outer frame 1 and the rail surface 4A becomes flush with the ground G. At this time, the stopper 6 of the rail 4 is positioned at the rear small portion of the manhole cover 23. It is in contact with the wheel 25 and regulates the retreat of the manhole cover 23. At this time, as shown in FIG. 5, the manhole cover 23 rises from the state of closing the entrance portion 2 until the rail surface 4A is flush with the ground G as shown in FIG. The transmission body 12 for the distance
Since the pushing-up distance of 1 is short, the number of rotation operations of the raising / lowering screw rod 16 by the jig rod 17 is small, and the opening work can be performed quickly.

Therefore, the insertion hole 26 of the manhole cover 23
After pulling out the jig rod 17 from the bottom, as shown in FIG. 8, when the manhole cover 23 is pushed out in the horizontal direction, the small wheel 25
Rotates on the rail surface 4A, so the manhole cover 23
Moves easily on the ground G with a small force. Then, when most of the manhole cover 23 is exposed to the ground, the jig bar 17 is inserted into the support hole 28 provided in the insertion hole 2 of the outer frame 1 so as to stand upright, and the rear surface of the manhole cover 23. The cover 23 can be prevented from inadvertently moving backward.

Next, when the manhole cover 23 on the ground G is closed in the hole 2, the reverse operation of the manhole cover is first performed so that the jig rod 17 contacting the rear surface of the manhole cover 23 is closed. After pulling out the tip from the support hole 28, the manhole cover 23 is pushed horizontally in the direction of the entry hole 2 and the front small wheel 25 of the manhole cover 23 comes into contact with the stopper 6 of the rail 4, so that The lid 23 is placed on the rail surface 4A completely apart from the ground G. Then, after inserting the jig rod 17 into the insertion hole 26 of the manhole cover 23 and fitting the tip of the jig rod 17 to the head of the lifting screw rod 16, the jig rod 16 is rotated in the reverse direction. As a result, the rail 4 moves downward while moving to the left in the figure, and the manhole cover 23 is fitted into the entry hole 2 and closed. Although the present invention has been described above with reference to the embodiment adapted to the manhole cover, it goes without saying that the invention is not limited to this.

[0019]

As described above, the structure for opening and closing the lid of the manhole or the like according to the present invention is the wheel for opening and closing the outer frame attached to the opening of the manhole and the hole formed at the center of the outer frame. And a rail installed in parallel with each other on opposite inner surfaces of the inlet hole that supports the lid via the wheel. The rails are spaced from each other in the longitudinal direction.
When one bearing and two bearings fixed to the outer frame are rotatably connected by two links so as to form a parallelogram, the center positions of the two links are respectively An end of the transmission body is rotatably pivotally attached, and an elevating screw rod rotatably supported by a bearing portion whose upper end faces the insertion hole of the lid and whose lower end is fixed to the outer frame in the elongated hole of the transmission body. When you set up,
A position at which a lifting body having a cam follower mounted on the lifting screw rod is screwed and mounted, and a rotation restricting member mounted on the lifting body is in the elongated hole of the transmission body, and the cam follower is in contact with the lower surface of the transmission body. Respectively, and the jig rod inserted from the insertion hole of the lid rotates the lifting screw rod to move the lifting body up and down to raise and lower the both rails with the lid placed thereon. Since the lid is moved horizontally to open and close the hole when the lid is raised, (1) even in the case of a heavy lid, the operator can easily and reliably open and close the lid with a small force. It can be performed.
(2) Since the screw rod is moved up and down to rotate, the opening / closing speed of the lid can be controlled as desired by the operator.
(3) Since the wheels come in contact with the rails and rise, the lid does not wobble even during opening and closing, and it is safe to stop at any time, improving work efficiency. (4) Since the lid moves up and down without being impacted and moves horizontally to open and close the hole, the durability of the lid is improved. (5) Since the number of rotations of the screw rod at the time of opening / closing the lid is small, the speed of the opening / closing work can be increased. (6) Since the overall height of the opening / closing mechanism can be kept low, it can be made compact and the lower space of the outer frame can be used to the maximum extent. There are various effects that the mechanism can be prevented from being damaged even when it is directly placed on the ground.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an open state of a lid such as a manhole according to the present invention.

FIG. 2 is a plan view showing a state in which a lid is opened.

FIG. 3 is an exploded perspective view of a rail lifting mechanism.

FIG. 4 is an assembled perspective view of the rail lifting mechanism.

FIG. 5 is a vertical cross-sectional view when a lid such as a manhole is in a closed state.

FIG. 6 is a vertical cross-sectional view showing a first process when opening a lid such as a manhole.

FIG. 7 is a vertical sectional view showing the second step.

FIG. 8 is a vertical cross-sectional view showing a state where a lid such as a manhole is completely opened.

FIG. 9 is a perspective view showing an open state of a conventional lid such as a manhole.

FIG. 10 is a perspective view showing a closed state of a different conventional manhole cover.

[Explanation of symbols]

 1 Outer Frame 2 Inner Hole 3 Inner Side 3a Inner Side 4 Rail 4A Rail Surface 6 Stopper 7 Outlet 8 Guide Rail 9 Bearing 10 Link 10a One End 10b Other End 10c Pivot 11 Bearing 12 Bearing 13 Arm 14 Long Hole 15 Rail Lifting Mechanism 16 Elevating screw rod 17 Jig rod 18 Socket 19 Bearing portion 20 Elevating body 21 Cylindrical child 22 Cam follower 23 Lid for manhole etc. 25 Wheel 26 Insertion hole G Ground

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Tadano 1-12-15 Nishiki-cho, Aoba-ku, Sendai City, Miyagi Prefecture Sendai Branch, Maeda Seikan Co., Ltd. (72) Akio Takahashi Mizusawa Industrial Park, Mizusawa City, Iwate Prefecture 1 50-chome Takashu Co., Ltd. (72) Inventor Takashi Ueno 1-2-7 Otemachi, Chiyoda-ku, Tokyo Nihon High Frequency Steel Co., Ltd. (72) Inventor Tsutomu Tateichi 4-chome, Numakan, Hachinohe-shi, Aomori Prefecture No. 108 within Takashiwa Casting Co., Ltd.

Claims (1)

[Claims] 1. An outer frame attached to an opening such as a manhole, a lid with wheels for opening and closing a hole formed in the center of the outer frame, and the hole for supporting the lid via the wheel. Two rails, each of which is provided in parallel with each other on the inner side surfaces facing each other, are spaced apart in the longitudinal direction of the rail, and two bearings fixed to the outer frame. When the links are rotatably connected so as to form a parallelogram, the ends of the transmission bodies are rotatably pivoted at the central positions of the two links, respectively, and the inside of the elongated hole of the transmission body is rotatably attached. When a screw rod for raising and lowering, which is rotatably supported by a bearing portion whose upper end faces the insertion hole of the lid and whose lower end is fixed to the outer frame, is erected, the lifting and lowering with a cam follower attached to the screw rod for raising and lowering The body is screwed and mounted, and the rotation restricting member mounted on the elevating body is inserted in the elongated hole of the transmission body and the cover. The mufollowers are respectively installed at positions where they come into contact with the lower surface of the transmission body, and the jig rods inserted from the insertion holes of the lid rotate the elevation screw rods to move the elevation bodies up and down to move both rails. An opening / closing structure for a lid such as a manhole, characterized in that the lid is moved up and down with the lid placed on the lid, and the lid is moved horizontally to open and close the hole when the lid is raised.