JP2588477B2 - Opening and closing structure for lids such as manholes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing structure of a cover such as a manhole provided at an intermediate portion of a common ditch or a culvert through which a power line, a telephone line, a water pipe and the like are inserted.

[0002]

2. Description of the Related Art As shown in FIG. 9, an opening / closing structure for a manhole cover includes an outer frame 1 made of cast iron fitted into an opening K of a manhole M, and an opening 2 formed at the center thereof. A structure in which a cover 3 of a cast iron manhole to be closed is provided, and the cover 3 of the manhole is rotatably connected to the inside of the entrance 2 through a hinge 4; As shown in FIG. 3, an inlet 2 is formed in a manhole M by cast-in-place concrete, and a hinge metal fitting 6 attached to a manhole cover 3 is engaged with an anchor bolt 5 erected inside the inlet 2. And a cover 3 made of cast iron so as to be rotatable with respect to the hole 2. When the manhole cover 3 is opened and closed, one end is lifted by human power using an opening / closing jig.

[0003]

As described above, the opening and closing of the cover 3 of the manhole M is manually lifted using an opening / closing jig, but the total weight of the cover 3 of the manhole M is reduced. If its external dimensions are 400mm x 800mm,
The weight is about 120 kg including the flat plate block and the interlocking block 7 stretched on the upper surface of the cover 3 of the manhole M. Therefore, when this is manually lifted and opened, 7
A force of about 0 kg to 80 kg is required, and when opening the lid 3, the reaction force is taken on the ground so that it can be managed. However, when the lid is closed, it is pulled downward by the heavy manhole lid 3, so it is actually closed. In view of this, a considerable force is required to lower the lid 3 while supporting it. At that time, there is a danger that the feet are pinched.

[0004] Immediately before the entrance 3 is closed by the cover 3 of the manhole M, it falls due to the weight of the cover 3 of the manhole M, so that a considerable impact is applied to the cover 3 of the manhole M. Therefore, this is one of the causes of the peeling of the block 7 stretched on the upper surface of the lid 3 of the manhole M and the occurrence of cracks in the block 7 or the lid 3. Once the block 7 is peeled or cracked, the block 7 or the like often falls off at the time of opening, and this repair requires a new block unless the block 7 of the manhole cover 3 is completely removed. 7 cannot be mounted, which requires a considerable amount of time.

Further, if dirt, earth and sand, etc. are contained in the fitting portion between the inlet 2 and the manhole cover 3, resistance occurs when the cover 3 is opened, and a large force is required. The opening work is very difficult. Further, in the case of FIG. 10 described above, a lot of “displacement” occurs when the inlet portion 2 is formed by on-site construction, the construction requires skill, and particularly when the ground on which the manhole M is constructed has a slope, There is a problem that it is difficult.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and can be easily opened and closed with a small force and without damaging a cover such as a manhole. The purpose of the present invention is to provide a workable object. The gist of the present invention is to provide an outer frame attached to an opening such as a manhole and a lid with wheels for opening and closing an opening formed in the center of the outer frame. And two bearings, which are provided in parallel with each other on the opposite inner surfaces of the inlet holes for supporting the lid via the wheels, the rails being spaced apart in the longitudinal direction thereof. The two bearings fixed to the outer frame are rotatably connected to each other by two links so as to form a parallelogram. At the center of the two links, the ends of the transmissions are respectively provided. Part is rotatably pivoted, and the upper end is inserted with a lid into the elongated hole of the transmission. An elevating screw rod rotatably supported on a bearing part whose lower end is fixed to the outer frame is erected, and an elevating body with a cam follower is screwed onto the elevating screw rod. A rotation restricting member mounted on the elevating body is installed in a long hole of the transmission body, and the cam follower is installed at a position where the cam follower is in contact with a lower surface of the transmission body. By rotating the screw rod for up and down and moving the elevating body up and down, the two rails are raised and lowered with the lid placed thereon, and the lid is moved in the horizontal direction when ascending to open and close the inlet. And a lid opening and closing structure for a manhole or the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to an embodiment 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 an opened state of a manhole cover.
2 is a plan view of the rail lift mechanism, FIG. 3 is an exploded perspective view of the rail lift mechanism, FIG. 4 is an assembled perspective view of the rail lift mechanism, and FIG. 5 is a vertical cross section when the manhole cover is in a closed state. In the figure,
FIG. 6 is a longitudinal sectional view showing a first step when the manhole cover is opened, FIG. 7 is a longitudinal sectional view showing the second step, and FIG. 8 is a longitudinal sectional view showing a state where the manhole cover is completely opened. It is.

In the drawing, 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 plan view by casting or the like, and a rectangular opening 2 in plan view is formed in the center thereof. At the same time, a pair of left and right rails 4 and 4 are installed in parallel on the inner surfaces 3 and 3 of the inlet 2 facing each other. 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 prism-shaped stopper 6 standing upright at one longitudinal end of the rail surface 4A, and an outlet 7 at the other end.
On one side edge of the rail surface 4A, a guide rail 8 stands upright along the longitudinal direction. On the back surface of the rail 4, two bearings 9, 9 are spaced apart in the longitudinal direction. The shaft holes 9a of the two bearings 9, 9 are formed so that their respective axes are perpendicular to the longitudinal direction of the rail 4.

On the opposite side of the guide rail 8, one end 10a of a link 10 of the same length is rotatably connected to a shaft hole 9a of the bearing 9 so as to be rotatable. The other end 10b is rotatably connected to a bearing 11 fixed to the back surface of the outer frame 1. Accordingly, the pair of rails 4 and 4 are respectively arranged in parallel with the opposed inner side surfaces 3 and 3 of the inlet 2, and the outer frame 1 and the two links 10 and 10 are connected to each other. Since the rail 4 forms a parallelogram, the two rails 4, 4 are installed so that the rail surfaces 4A, 4A always move horizontally in the horizontal state with respect to the outer frame 1 and move up and down in the vertical direction. ing.

Numeral 12 denotes a rectangular parallelepiped transmission, and arms 13, 13 in a downwardly inclined state are respectively provided at the front and rear ends in the longitudinal direction.
Is extended, and an end 13a of each of the arms 13, 13 is provided.
Is a pivot 10 projecting from the center of the links 10
c so as to be rotatable, and are arranged in parallel with the rail 4. The transmission body 12 has a long hole 1 having a predetermined length parallel to the longitudinal direction of the rail 4.
4 is formed in a vertically penetrating state, and a rail elevating mechanism 15 is provided at the position of the elongated hole 14 of the transmission 12 as shown in FIGS. That is,
In the figure, reference numeral 16 denotes an up-and-down elevating screw rod, on the top of which a socket 18 to be fitted with the lower end of a T-shaped jig rod 17 is formed. Is rotatably inserted into a plate-shaped bearing portion 19 fixed to the base member and stands upright.

An elevating body 20 is rotatably screwed to the elevating screw rod 16 at a lower portion of the transmission 12, and a shaft of the elevating screw rod 16 is mounted on the upper surface of the elevating body 20. Before and after a straight line passing through the heart, the elongated hole 14 of the transmission 12
A pair of rotation restricting cylinders 2 movably inserted into the inside
1,21 are upright. The two separated cylindrical members 21 and 21 are for raising and lowering only in the vertical direction without rotating the elevating body 20 when the elevating screw rod 16 is rotated. A cam follower 22 is provided on a side surface of the elevating body 20 to abut the lower surface of the transmission 12 and to slide the rail 4 up.

Reference numeral 23 denotes a manhole cover for opening and closing the entrance hole 2, which is formed of a casting or the like as in the case of the outer frame 1, and has a lattice-shaped reinforcing rib 24A formed on the back surface thereof. In addition, a flat plate block or an interlocking block 24B is stretched on the upper surface. 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. The manhole cover 2
3 is formed with an insertion hole 26 for inserting the jig rod 17 at a corresponding position on the axis of the lifting screw rod 16 when the cover 23 of the manhole closes the entrance hole 2. In the meantime,
When the inlet 2 is closed, it is closed by a cap 27 so that dust or the like does not enter through the insertion hole 26.

Next, the operation when the cover 23 of the manhole which closes the entrance 2 will be described. First, as shown in FIGS.
After removing the cap 27 closing the third insertion hole 26, the jig rod 17 is inserted into the insertion hole 26, and the tip of the jig rod 17 is fitted to the socket 18 formed on the head of the screw rod 16 for elevating. I do. When the jig rod 17 is rotated in the direction in which the elevating body 20 moves upward, the elevating screw rod 16 is rotated in the same direction.
The screw rod 16 for raising and lowering is lifted without being rotated by the two cylindrical members 21 and 21 inserted therein, and the transmission body 12 is pushed up by the cam follower 22 mounted on the lifting body 20.

Thus, each arm 13 of the transmission 12
13 as well as the end 13a of the arm 13 and the pivot 10c.
The links 10 and 10 pivotally connected at are also subjected to the upward force. As a result, the links 10 and 10 rotate clockwise around the bearing 11 fixed to the outer frame 1, respectively, and the rails rotatably pivotally connected to one end 10 a of the links 10 and 10 and the bearing 9. 4 also moves rightward in the figure while rising by the rotating link 10. And rail 4
Rises while advancing until the outlet 7 of the rail 4 hits the inner side surface 3a of the outer frame 1 within the margin of the elongated hole 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 advances rightward in the figure. Accordingly, the lid 23 on the rail surface 4A relatively moves leftward on the rail surface 4A until the rear small wheel 25 comes into contact with the stopper 6, and rises with the rise of the rail 4.

[0016] Then, as shown in FIG.
When the rail 10 is raised, the exit 7 end of the rail 4 comes into contact with the inner surface 3a of the outer frame 1 so that the rail surface 4A is flush with the ground G. At this time, the stopper 6 of the rail 4 is 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 is closed from the state in which the opening 2 is closed, and the rail surface 4A is raised until the rail surface 4A is flush with the ground G as shown in FIG. Transmission 12
Since the push-up distance is short, the number of rotation operations of the lifting screw rod 16 by the jig rod 17 is small, and the opening operation can be performed quickly.

Therefore, the insertion hole 26 of the manhole cover 23 is provided.
After the jig rod 17 is pulled out of the small hole 25 as shown in FIG.
Rotates on the rail surface 4A, so that the manhole cover 23
Moves easily on the ground G with a small force. Then, when most of the manhole cover 23 comes out on the ground, the jig rod 17 is inserted into the support hole 28 provided in the insertion hole 2 of the outer frame 1 to stand upright. , It is possible to prevent the lid 23 from retreating carelessly.

Next, when the cover 23 of the manhole on the ground G is closed in the entrance 2, the reverse of the above-mentioned operation is performed first of all, with the jig rod 17 contacting the rear surface of the manhole cover 23. After the tip is pulled out from the support hole 28, the manhole cover 23 is pushed horizontally in the direction of the entrance 2, and the front small wheel 25 of the manhole cover 23 contacts the stopper 6 of the rail 4. The lid 23 is completely separated from the ground G and is placed on the rail surface 4A. Then, after inserting the jig rod 17 into the insertion hole 26 of the manhole cover 23 and fitting the tip thereof to the head of the screw rod 16 for elevating and lowering the jig rod 16, the elevating body 20 As a result, the rail 4 descends while moving in the left direction in the figure, and the manhole cover 23 is fitted into the opening 2 and closed. Although the present invention has been described above with reference to the embodiment applied to a manhole cover, it is a matter of course that the present invention is not limited to this.

[0019]

As described above, the opening / closing structure for a cover such as a manhole according to the present invention comprises an outer frame attached to an opening of a manhole and a wheel for opening and closing a hole formed in the center of the outer frame. And two rails which are provided in parallel with each other on the opposing inner surfaces of the inlet holes for supporting the lid via the wheels. The rails are provided apart from each other in the longitudinal direction.
And the two bearings fixed to the outer frame are rotatably connected by two links so as to form a parallelogram. Each of the two links is located at the center of the two links. An elevating screw rod rotatably supported at an end of the transmission body in a rotatable manner, and rotatably supported by a bearing fixed at the upper end to the insertion hole of the lid and at the lower end to the outer frame in the elongated hole of the transmission. When standing up,
A position where the elevating body equipped with the cam follower is screwed and mounted on the elevating screw rod, and the rotation restricting member mounted on the elevating body is in the elongated hole of the transmission, and the cam follower is in contact with the lower surface of the transmission. Respectively, and the jig rod inserted from the insertion hole of the lid rotates the elevating screw rod to move the elevating body up and down, thereby raising and lowering both rails with the lid placed thereon. Since the lid is moved in the horizontal direction when ascending, the opening is opened and closed, (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) The opening and closing speed of the lid can be controlled as desired by the operator because the screw rod is moved up and down by rotation.
(3) Since the wheels are in contact with the rails and rise, the lids do not shake during the opening and closing, and if they are safe, they can be stopped halfway and the work efficiency is improved. (4) Since the lid moves up and down without receiving an impact and moves horizontally to open and close the inlet, 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 can be reduced, the speed of the opening / closing operation can be increased. (6) The overall height of the opening / closing mechanism can be kept low, so that the size can be reduced, and the lower space of the outer frame can be used effectively to the maximum. There are various effects such that the mechanism can be prevented from being damaged even when directly placed on the ground.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a state where 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 elevating mechanism.

FIG. 5 is a longitudinal sectional view when a cover such as a manhole is in a closed state.

FIG. 6 is a longitudinal sectional view showing a first process when opening a cover such as a manhole.

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

FIG. 8 is a longitudinal sectional view showing a state in which a cover such as a manhole is completely opened.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer frame 2 Inlet part 3 Inner surface 3a Inner surface 4 Rail 4A Rail surface 6 Stopper 7 Exit 8 Guide rail 9 Bearing 10 Link 10a One end 10b Other end 10c Axis 11 Bearing 12 Transmission body 13 Arm 14 Slot 15 Rail lift mechanism 16 Screw Bar for Elevating 17 Jig Rod 18 Socket 19 Bearing 20 Lifting Body 21 Cylinder 22 Cam Follower 23 Cover for Manhole 25 Wheel 26 Insertion Hole G Ground

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tatsuo Tadano 1-12-15 Nishikicho, Aoba-ku, Sendai, Miyagi Prefecture Inside the Sendai Branch of Maeda Pipe Works Co., Ltd. (72) Inventor Akio Takahashi 1 Mizusawa Industrial Park, Mizusawa City, Iwate Prefecture 50-chome, Takashu Co., Ltd. (72) Inventor Takashi Ueno 1-7-2, Otemachi, Chiyoda-ku, Tokyo Inside Japan High Frequency Steel Industry Co., Ltd. (72) Inventor Tsutomu Tateichi 4-7-1, Numadate, Hachinohe City, Aomori Prefecture No. 108 Inside of High Frequency Casting Co., Ltd. (56) Reference: Japanese Utility Model Application Sho 60-27161 (JP, U) Japanese Patent Publication No. 2-59892 (JP, B2)

Claims (1)

(57) [Claims] 1. An outer frame attached to an opening such as a manhole, a lid with wheels for opening and closing an inlet formed in the center of the outer frame, and the inlet for supporting the lid via the wheels. And two rails provided in parallel with each other on the inner surfaces facing each other. The two bearings are separated from each other in the longitudinal direction and two bearings are fixed to the outer frame. When the links are rotatably connected so as to form a parallelogram, the ends of the transmissions are rotatably pivoted at the center positions of the two links, respectively, so that An elevating screw rod whose upper end faces the insertion hole of the lid and whose lower end is rotatably supported by a bearing fixed to the outer frame is erected, and a cam follower is mounted on the elevating screw rod. The rotation restricting member mounted on the elevating body is inserted into the elongated hole of the transmission body, and Each of the two rails is moved by moving the lifting / lowering body up and down by rotating the lifting / lowering body by rotating the lifting / lowering body with a jig rod inserted through the insertion hole of the lid, and installing the mulforer at a position in contact with the lower surface of the transmission. A lid opening / closing structure for a manhole or the like, wherein the lid is moved up and down while the lid is placed thereon, and the lid is moved in a horizontal direction when the lid is lifted to open and close the inlet.