JP2003293385A - Opening/closing device for lid body of manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and easily perform an opening/closing operation of a heavy subsidiary lid of a manhole by oneself. <P>SOLUTION: This device is composed of a square main lid 1, the paired subsidiary lids 20, and a fixing bar 30 and a fall preventing stopper 40 for each of the subsidiary lids 20. In the main lid 1, a square opening 2 is formed inside it; locking edges 6 and 7 are provided so as to face each other along central parts of both lateral sides on a long side of the opening 2 and both lateral sides on a short side thereof, respectively; and guide rails 11 equipped with guide holes 10 are provided along both right and left side parts of each of the lateral sides on the long side, respectively. The subsidiary lids 20 are juxtaposed with a gap 21 between them; peripheral edges of them are formed so as to be large enough to be placed on the locking edges 6 and 7; and a rotating shaft 25 is provided in approximately central parts on both lateral sides of each of the subsidiary lids 20, so that a roller 26 can be attached to the rotating shaft 25 and mounted so as to be movable on the guide rails 11. The fixing bar 30 is inserted into the gap 21 between the subsidiary lids 20, so that both ends thereof can be detachably attached to a central part on the long side of the main lid 1. In the stopper 40, bearing fittings 43 and 46 are provided in appropriate places on each of the backsides of the main lid 1 and the subsidiary lids 20, respectively, and both ends of a supporting rod 41 are attached to both of the bearing fittings 43 and 46. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for opening and closing a lid installed in a manhole such as an underground common ditch for accommodating communication cables, power transmission cables, water and sewer pipes and the like.

[0002]

2. Description of the Related Art Conventionally, as a device of this kind, a child lid to which a roller is attached is placed on a pair of rails which are vertically opposed to each other in an opening of a parent lid, and when the lid is opened. Various devices are known, such as a device in which both the rails are raised to the ground and then the slave lid is slid along the ground, but there is a problem in that the structure is complicated and therefore expensive. It was

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention has a relatively simple structure and enables one person to safely and easily perform the operation of opening and closing the heavy lid. It is intended to provide a manhole cover opening / closing device configured as described above.

[0004]

In order to achieve the above object, a device for opening and closing a manhole cover according to the present invention comprises a rectangular master cover to be mounted on a manhole and a pair of sub-covers arranged in parallel in the master cover. And a fixed bar of the child lid and a stopper for preventing the child lid from collapsing, the parent lid has a square opening formed inside thereof, and a central portion and a short side of the opposite long sides of the opening opposite each other. The engaging edges projecting into the opening along the opposite sides of the side, respectively, and the guide rails with the guide holes are provided along the left and right sides of the long sides. The sub-lid can be arranged in the opening of the master lid side by side with a gap of a required width between them to close the opening, and the peripheral edge of the sub-lid is sized to ride on the locking edge of the master lid. Then, a rotary shaft is provided at substantially the center of each side of each child lid, and a roller is attached to the tip of the rotary shaft to attach the roller. The fixing bar is mounted so that it can move on the rail, and the fixing bar is inserted into the gap between the sub-lids, and both ends thereof are detachably attached to the central portion of the long side of the main lid. The fall prevention stopper is provided with bearing fittings at appropriate positions on the respective back surfaces of the master lid and the slave lid, and both ends of the support rods are attached to the bearing fittings so that the slave lid can be opened. It is configured so that it can be prevented from falling.

Further, the rotary shaft of each sub-lid passes through the guide hole and is provided with a roller at its tip end to engage with the guide rail. The roller is fitted into the end of each guide rail when opening and closing. It is also possible to form each possible concave portion.

Further, a recess may be provided inside the central portion of the long side of the main lid so as to face each other, and both ends of the fixing bar can be fitted and locked.

Further, the fall prevention stopper is approximately J
One end of the supporting rod formed in a shape is attached to a bearing fitting provided on the lower side surface of the guide rail so that it can be undulated, and the other end is attached to a bearing fitting on the side of the slave lid, The lid may be prevented from falling when the lid is opened.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A manhole cover opening / closing device according to the present invention comprises a rectangular main lid to be mounted on a manhole, a pair of sub-lids arranged side by side in the main lid, a fixing bar for the sub-lid, and the same. It consists of a fall prevention stopper. The parent lid has a rectangular opening formed inside thereof, and locking edges projecting into the opening along the center portions of the opposite long sides of the opening and the opposite opposite sides of the short sides thereof. And a guide rail provided with guide holes along the left and right sides of each long side. The sub-lid can be installed in the opening of the master lid side by side with a gap of a required width between them to close the opening, and its peripheral edge is sized to ride on the locking edge of the master lid. A rotary shaft is provided at substantially the center of both sides of each child lid, and a roller is attached to the tip of the rotary shaft so as to be movable on the guide rail. The fixing bar is inserted into the space between the child lids, and both ends thereof can be fitted and locked to the central portion of the long side of the parent lid. The fall prevention stopper is provided with bearing fittings at appropriate places on the respective back surfaces of the parent lid and the child lid, and both ends of the support rod are attached to both bearing fittings so that the child lid can be prevented from falling when the lid is opened. I am doing it.

The rotary shafts of the respective child lids pass through the guide holes and are provided with rollers at their tip ends to engage with the guide rails. At the inner end portions of the guide rails, the rollers are provided when the lids are closed. In some cases, a recessed portion that can be fitted is formed.

Further, in order to surely and easily attach the fixing bar to the master lid, a recess into which both ends of the fixing bar can be fitted is provided inside the central portion of the long side of the master lid so as to face each other. ,
In some cases, both ends of the fixing bar may be fitted together and detachably fixed with a lock tool such as a lock nut or lock bolt.

Further, the falling prevention stopper has a support rod formed in a substantially J shape, and a long side end thereof is movably attached to a bearing fitting provided on a lower side surface portion of the guide rail. When the lid is opened, In some cases, the short-side end is attached to a bearing metal fitting on the child cover side that is open to prevent the child cover from falling.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIGS. 1 and 7, reference numeral 1 denotes a rectangular main lid that is slightly long in the left-right direction, and has a rectangular opening 2 inside.
Has been formed. A peripheral edge 3 is provided around the outer periphery of the main lid 1 and the inner periphery of the opening 2, and paving tiles or blocks can be laid on the upper surface thereof. Further, recesses 4 and 4 into which fixed bars, which will be described later, can be fitted, are formed in central portions of the opposite long sides inside the opening 2. Reference numeral 5 denotes a reinforcing rib arranged on the back surface of the main lid 1.

Reference numerals 6 and 6 are long side locking edges projecting in the opening 2 along the lower central portions of the opposite long sides of the opening 2, and 7 and 7 are short side edges. Short-side locking edges projecting in the opening 2 along the lower side, and when the sub-lids to be described later are closed, both side end portions 8 and 8 of the front portion of each sub-lid and The rear end portions 9 are formed so that they can be locked respectively.

Further, laterally elongated guide holes 10 and 10 are provided at both left and right sides of the opening 2 on the long side, that is, below the portion where the long side locking edge 6 is not provided. Guide rails 11 having an L-shaped cross section are provided. A shallow arc-shaped recess 12 is provided at the inner end of each guide rail 11.

Reference numerals 20 and 20 denote a pair of child lids arranged side by side in the opening 2 of the parent lid 1, and a gap 21 having a required width is provided between them. A peripheral edge 22 is provided around each child lid 20 so that pavement tiles or blocks can be laid on the upper surface thereof. Further, reinforcing ribs 24 are provided on the back surface.

A rotary shaft 25 is provided at a substantially central portion of both side walls of each child lid 20, and the tip of the rotary shaft 25 is inserted into the guide hole 10 so that a roller 26 is axially attached to the tip. The roller 26 can slide along the inside of the guide rail 11, and the roller 26 can be fitted into the recess 12 when the lid is closed. Further, keyhole-shaped hooking holes 28, 28 are provided in the central portion of each child lid 20, respectively.

Reference numeral 30 denotes a fixing bar which is fitted between the child lids 20 and 20 and is formed into a rectangular tube shape. Both ends of the fixing bar are fitted into the recesses 5 and 5, and a lock bolt 31 is used. It is designed to be screwed and fixed.

Reference numeral 40 denotes a stopper for preventing the child lids 20 from collapsing, and an end portion of the long side 42 of a supporting rod 41 formed by forming a bar material into a substantially J shape is provided on the lower side of the rear surface of the guide rail 11. The bearing fitting 43 is slidably mounted, and the curved portion 44 is formed so as to be able to project and retract in the opening 2.
Thus, when the child lid 20 is opened, its short side 45 end is attached to the bearing fitting 46 projecting from the rear surface end of the child lid 20 so that the child lid 20 can be prevented from falling. Configured.

Reference numeral 50 shown in FIG. 8 indicates the sub-lid 2 when the lid is opened.
The operating rod is used to lift 0, and a handle 51 is provided on the upper end of the shaft, and spring pins 52 are provided on both sides of the lower end so that the spring pins 52 can be retracted. Then, when the lower end of the operating rod 50 is fitted into the hook hole 28 of the child lid 20 and then rotated 90 degrees, each spring pin 52 is locked by the hook hole 28.
It is possible to tie it to.

Next, the case of opening the left side child lid 20 which closes the opening 2 will be described. First, the lock of the lock bolt 31 is released, the fixed bar 30 is removed from the opening 2, and each child lid 20 is opened and closed. Then, the operating rod 50 is hooked in the hooking hole 28 of the child lid 20 and lifted upward while pulling the front side of the child lid 20 toward the central portion side of the opening portion 2, and the rear outer side end portion 9 of the child lid 20. Is disengaged from the short side locking edge 7 and pivots upward.

Then, after the child lid 20 is erected, the back surface of the child lid 20 is pushed horizontally toward the left short side of the opening 2 so that the roller 26 slides on the guide rail 11,
It stops when the rotary shaft 25 hits the outer end of the guide hole 10.

Thus, the support rod 41 of the fall prevention stopper 40 is pulled out into the opening 2, the short piece side portion 45 is erected, and its end is provided on the rear surface of the slave lid 20.
When attached to, the child cover 20 is supported so as not to fall. The opening operation of the right side cover can be performed in the same manner as the right side cover.

Next, the case of closing the left side child lid 20 will be described. First, the short piece side end portion 45 of the support rod 41 is removed from the back surface of the child lid and laid down, and then retracted to the side of the parent lid 1. Then, when the upper surface of the child lid 20 is pushed horizontally toward the center of the opening 2, the roller 26 moves to the guide rail 11
It slides up and stops when the rotary shaft 25 hits the inner end of the guide hole 10. At this point, the operating rod 5
0 is attached to the slave lid 20.

When the operating rod 50 is held and the tip of the upper surface of the child lid 20 is pushed inward, the child lid is rotated until it becomes horizontal, and its front side both end portions 8 and 8 are engaged with the long side. It stops when it hits the toes 6, 6. Then, when the outer edge of the child lid 20 is pushed until it hits the short side portion of the opening 2, the rear outer edge 9 of the child lid 20 is locked on the short side locking edge 7. Finally, when the fixing bar 30 is fitted in the central gap 21,
The child lid is fixed and the opening 2 is closed. Then, both ends of the fixed bar 30 are locked in the recesses 4 and 4 with bolts or the like.

[0025]

The manhole cover opening / closing device according to the present invention has a rectangular opening formed inside the main lid, as described in claim 1, and the opposite sides of the opening on the long side. Guide rails provided with paired locking edges projecting into the opening along opposite sides of the central part and the short side, and with guide holes along the left and right sides of each long side. Are provided side by side with a gap of a required width between them to close the opening, and the peripheral portions of the child lid are formed so as to ride on the locking edges of the parent lid. A rotary shaft is provided on the shaft, a roller is mounted on the tip of the rotary shaft so that the roller can move on the guide rail, and a fixed bar is removably mounted in the gap between the sub-lids. So that the bearing metal fittings are provided at appropriate positions on the lower side surface of the guide rail and the back surface of the child cover,
By constructing the support rod between both bearing fittings, one person can safely and easily open and close the heavy lid, and securely prevent the lid from falling when opening. You can Further, since the structure is simpler than that of the conventionally known one, it can be provided at a relatively low cost.

Further, as described in claim 2, the rotary shaft of each sub-lid passes through the guide hole, and a roller is provided at the tip end thereof to engage with the guide rail, and the guide rail has an end portion. Since each of the concave portions into which the roller can be fitted when the lid is closed is formed, the opening / closing operation of each child lid can be performed more easily.

Further, as described in claim 3, a recess is provided inside the central portion of the long side of the main lid so as to face each other, and both ends of the fixing bar can be fitted and locked. Therefore, the pair of sub-lids can be securely fixed, and the locked state can be visually checked from the outside, which is safe. Therefore, since the lock bar is provided, the fixing bar cannot be removed in a sloppy manner, so that the danger can be prevented.

Further, according to a fourth aspect of the present invention, the fall prevention stopper has one end portion of the support rod formed in a substantially J-shape mounted on the bearing fitting on the guide rail side so as to be capable of undulating, and the other end portion. Since the bearing can be attached to the bearing metal fitting on the side of the child cover which is open, the child cover can be prevented from falling over with a simple structure, and the work in the manhole can always be performed safely.

Further, the device according to the present invention has a feature that it can be used not only for a manhole cover but also for any underground structure using a rectangular cover because of its structure.

[Brief description of drawings]

FIG. 1 is a plan view of a manhole cover opening / closing device according to the present invention, showing a closed state of each sub-cover.

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

3 is a partially enlarged cross-sectional view taken along the line BB in FIG.

4 is a cross-sectional view taken along the line CC in FIG.

FIG. 5 is a plan view showing an open state of each sub-lid.

6 is a cross-sectional view taken along the line EE in FIG.

FIG. 7 is a sectional view taken along line FF in FIG.

FIG. 8 is a front view of an operating rod.

[Explanation of symbols]

1 lid 2 openings 4 recess 6 Long side locking edge 7 Short side locking edge 10 guide holes 11 Guide rail 12 arc-shaped recess 20 child cover 21 Gap 25 rotation axis 26 roller 30 fixed bar 31 Rock bolt 40 Fall prevention stopper 41 Support rod 43 Bearing bracket 46 Bearing bracket 50 operating rod

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Yoshida             403 Yoshimi, Otsu-ku, Himeji City, Hyogo Prefecture (72) Inventor Takatoshi Ogawa             3-36-2 Nihonbashihamacho, Chuo-ku, Tokyo             Sato Iron Works Co., Ltd. F term (reference) 2D047 BB06

Claims (4)

[Claims] 1. A rectangular main lid to be mounted on a manhole, a pair of sub-lids arranged in parallel in the main lid, a fixing bar of the sub-lid and a stopper for preventing the fall of the sub-lid.
A square opening is formed on the inside of the opening, and the locking edges projecting into the opening are provided opposite to each other along the central portions of the opposite long sides of the opening and the opposite opposite sides of the short side. , Each of the long side is provided with a guide rail having a guide hole along each of the left and right sides of each side, and the sub-lid is in the opening of the main lid,
The openings can be closed by arranging them with a gap of a required width between them, and their peripheral edges are formed so as to ride on the locking edges of the master lid, and are formed in the substantially central portions on both sides of each slave lid. Is provided with a rotary shaft, and a roller is attached to the tip of the rotary shaft so as to be movable on the guide rail.
The both ends of the sub-lid can be removably attached to the central portion of the long side of the parent lid by inserting it into the gap between the sub-lids. The manhole cover body is characterized in that a bearing metal fitting is provided at an appropriate position on each back surface of the and the both ends of the supporting rod are attached to both bearing metal parts to prevent the child lid from tipping over when the lid is opened. Switchgear. 2. The rotary shaft of each sub-lid passes through the guide hole,
2. A roller is provided at the tip of the guide rail so as to engage with the guide rail, and a concave portion into which the roller can be fitted at the time of opening and closing is formed at each end of each guide rail. A device for opening and closing the manhole cover described. 3. A concave portion is provided inside a central portion of a long side of the main lid so as to face each other, and both ends of the fixing bar can be fitted and locked. Opening and closing device for manhole cover. 4. The fall-prevention stopper is configured such that one end portion of a support rod formed in a substantially J shape is movably mounted on a bearing fitting provided on a lower side surface portion of the guide rail, and the other end portion is attached. 4. The manhole cover opening / closing device according to claim 1, wherein the device is mounted on an opened bearing lid side metal fitting so as to prevent the child lid from falling when the lid is opened.