JPH0721617U - Manhole switchgear - Google Patents

Abstract

(57) [Abstract] [Purpose] Firstly, it has a small number of fulcrums, a simple structure, a small number of parts, and is excellent in terms of price, weight, durability, maintenance, inspection, and repair. We propose a manhole opening / closing device that has reduced work force and excellent workability when operated between the closed state, the floating state, and the open state.
Thirdly, when closing the manhole cover, a mismatching movement locus between the manhole cover and the link body is absorbed, stress is not applied, damage and damage are prevented, and a switchgear that improves durability is also proposed. [Composition] In the opening / closing device 18, the link body 2 is provided between the bracket 22 holding the manhole cover 4 and the base 20.
1 is swingably assembled in the upper and lower parts, and the bracket 2
It is also possible to directly support 2 on the base 20, and the link body 21 is provided with upward biasing means 23.
Further, the link body 21 is assembled to the base portion 20 with the horizontally long mounting hole and the first pin 24 movable in the mounting hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manhole opening / closing device. That is, the present invention relates to a manhole cover opening / closing device for a manhole provided on a tank.

[0002]

[Prior art]

 FIG. 4 shows a conventional manhole opening / closing device. (1) is a plan view of the manhole cover with the opening closed, and (2) is a front view of the manhole cover tightened in the opening. Explanatory drawing and FIG. 3C are front explanatory views in the state where the manhole cover has opened the opening. For example, in a manhole 2 provided on a tank 1 of a granular material carrier, a manhole cover 4 that opens and closes an opening 3 of the manhole 2 is heavy because of the high pressure inside the tank 1. The switchgear 5 was adopted.

That is, a conventional manhole 2 opening / closing device 5 holds a pedestal portion 6 standingly fixed on the tank 1 and a manhole cover 4 fixedly, and a hinge 7 is interposed in the middle to horizontally move the manhole cover 2. The divided holder portion 8, the parallel link-shaped pantograph mechanism 9 which is interposed between the pedestal portion 6 and the holder portion 8 and connects the two, and the pantograph mechanism 9 are interposed to urge them upward. And a biasing means 10 composed of a spring. The pantograph mechanism 9 is composed of two parallel links 11 and a pin 12, which is a pivot point for pivotally attaching the upper and lower ends of the link 11 to the pedestal 6 and the holder 8, respectively. Two sets of 9 were provided on both sides of the pedestal part 6 and the holder part 8. The biasing means 10 composed of a spring is interposed between the pedestal portion 6 side and the link 11 via a pin 12, respectively, and biases the link 11 upward, so that the heavy manhole cover 4 is closed. It functions to reduce the operating force when operating between the open state and the open state. The manhole cover 4 is closed by the opening / closing device 5 as shown in FIG. 4 (1), and is tightened in the opening 3 as shown in FIG. 4 (2). As shown in FIG. 4 (3), it was able to be manipulated and displaced such that it floated over the opening 3 or opened.

In the figure, 13 is a handle of the manhole cover 4, and 14 is a fastening member for vertically fastening the manhole cover 4 toward the opening 3. The tightening member 14 opens the manhole cover 4 by screwing a tightening bolt 17 from the upper side onto the threaded rod 15 erected on the tank 1 via the vane portion 16 of the manhole cover 4. It is designed to be fastened to part 3.

[0005]

[Problems to be solved by the device]

 By the way, in such a conventional example, the following problems have been pointed out. First of all, in the conventional opening / closing device 5, even if only one set is provided on one side, the hinge 7 of the holder part 8 and the pin 12 of the pantograph mechanism 9 have many fulcrums, and there are about 7 or 4 hinges. The pin 12, the two links 11, the biasing means 10 interposed on each side, the holder part 8 divided into two parts, the pedestal part 6 and the like have a complicated structure and a large number of parts. Therefore, the conventional switchgear 5 has been pointed out to have problems in terms of price, weight, durability, maintenance, inspection and repair.

Secondly, the heavy manhole cover 4 is operated between a horizontal state in which the opening 3 is closed, a horizontal state in which the opening 3 is levitated, and a vertical state in which the opening 3 is opened. In doing so, the urging means 10 surely reduces the operating force. However, with this opening / closing device 5, since the heavy manhole cover 4 is opened / closed 90 degrees between horizontal / horizontal postures and vertical / vertical postures, a large operating force is still required from this aspect, and workability is a problem. Was pointed out.

Thirdly, when tightening the manhole cover 4 toward the opening 3 with the tightening member 14, as shown by the arrow in (2) of FIG. While it descends vertically while drawing a linear movement locus, the upper pin 12 and the two link bodies 11 of the pantograph mechanism 9 of the switchgear 5 are curved loci with the lower pin 12 as the center. Draw and tilt diagonally to descend. In this way, since the movement locus of the manhole cover 4 and the movement locus of the pantograph mechanism 9 do not coincide with each other during tightening, a force is applied to the manhole cover 4 and the opening / closing device 5 due to this disagreement, and stress acts on them. Was easily damaged or broken, and had a problem with durability. Especially, the pin 12 and the link 11 of the pan tag rough mechanism 9 were easily damaged or broken.

In view of the above situation, the present invention has been made to solve the problems of the above-mentioned conventional example. First, in claim 1, between the bracket holding the manhole cover and the base portion. It is also possible to assemble the link bodies so that they can swing in the upper and lower parts, respectively, and to directly support the bracket on the base part. Moreover, the link bodies can be supported by upward biasing means. Therefore, firstly, there is a manhole opening / closing device that has a small number of fulcrums and a simple structure and a small number of parts, and secondly, the operating force is reduced when operating between a closed state, a floating state and an open state. The purpose is to propose. Next, according to claim 2, the swingable assembly of the link body to the base portion is further carried out by using the horizontally long mounting hole and the pin movable in the mounting hole between the forward position and the backward position. Thirdly, in addition to the above, it is an object of the present invention to propose a manhole opening / closing device that absorbs inconsistent movement trajectories of the manhole cover and the link body during tightening and prevents damage and damage.

[0009]

[Means for Solving the Problems]

 The technical means of the present invention for achieving this object are as follows. First, claim 1 is as follows. That is, the manhole opening / closing device relates to a manhole cover opening / closing device in a manhole provided on a tank and including an opening and a manhole cover capable of opening / closing the opening. Then, a column that is erected on the tank near the opening, a stand that is provided on the column and that can be horizontally rotated with respect to the tank, and a lower part that is swingably attached to the platform. The link body and the base end portion of the link body swingably assembled to the upper portion of the link body, and the tip portion holds the manhole cover in a fixed manner, and the tip portion swings to lie on the base portion. It has a bracket that is in a positional relationship that can also be supported, and a biasing means that is interposed to bias the link body upward.

Next, claim 2 is as follows. That is, in this manhole opening / closing device, in the manhole opening / closing device described in claim 1, the swingable assembly of the link body to the base portion corresponds to the base portion and the lower portion of the link body. It is implemented by a horizontally long mounting hole and a pin that is fitted into the mounting hole and can move laterally in the mounting hole. Further, a fastening member is erected on the tank near the opening, and the fastening member enables the manhole cover closing the opening to be vertically fastened toward the opening. There is. Then, the pin takes an advancing position in which the pin is urged by the urging means interposed and moved laterally toward the opening, and the manhole cover is moved to the opening by the fastening member. When it is tightened vertically, it is pushed through the bracket and the link body, and takes the retracted position in which it is moved laterally in the direction opposite to the opening against the urging force of the urging means.

[0011]

[Action]

 Since the present invention comprises such means, it operates as follows. First, in the opening / closing device according to claim 1, the link body is swingably assembled between the bracket holding the manhole cover and the base on the column so as to be swingable at the upper and lower portions thereof. At the same time, it is possible to directly support the bracket on the pedestal, and a biasing means for biasing the link body upward is interposed. Therefore, by manipulating such an opening / closing device, the manhole cover is displaced to each of the following states. That is, the manhole cover is first held on the opening while the opening is closed, and then the manhole cover is placed on the base at the tip of the bracket and the lower part of the link via the bracket and the link. The manhole cover is supported by, and floats above the opening, and the manhole cover is rotated to the side opposite to the opening by rotating the base to open the opening, and the manhole is used for maintenance, inspection and repair. The cover is swung until it assumes a vertical posture about the link body and is tilted.

Therefore, firstly, this opening / closing device has a small number of fulcrums because the above-described operations are performed with the upper and lower parts of the link body and, if necessary, the tip of the bracket as a fulcrum. Moreover, the structure is simple and the number of parts is small. Secondly, when the manhole cover is operated between the closed state, the floating state and the open state, the link body is biased upward by the biasing means and the manhole cover is closed, floated, Through the open state, the player can maintain a horizontal posture, greatly reducing operating force.

Next, in the opening / closing device according to the second aspect, the swingable assembly of the link body to the base portion is further performed by the horizontally long mounting hole and the pin swingable in the mounting hole. There is. The manhole cover can be tightened with the tightening member from the closed state to the tightened state where it is further tightened in the opening.

[0014] Thus, in addition to the above, thirdly, in such tightening, the manhole cover draws a vertical linear movement locus and descends vertically, whereas the link body of the opening / closing device is centered on the pin. Draw a curved locus and swing down. Now, here, such a disagreement of the movement trajectory is absorbed by the pin, which is the center of swing in the mounting hole, moving from the forward position to the retracted position by being pressed against the urging force of the urging means. Be done. Therefore, the stress acting due to the disagreement is also eliminated.

[0015]

【Example】

 The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 is a front explanatory view of an embodiment of the present invention. FIG. 1 (1) shows a state in which a manhole cover 4 closes an opening 3 and FIG. 2 (2) shows a manhole cover 4 floating above the opening 3. The respective states are shown below. 2A and 2B are front explanatory views of the embodiment, FIG. 1A shows a state in which the manhole cover 4 opens the opening 3, and FIG. 2B shows a state in which the manhole cover 4 is tilted from the opening 3. Indicates. FIG. 3 is a front explanatory view of a main part showing an example of assembling the link body in the embodiment of the present invention. FIG. 3 (1) shows a state in which the manhole cover 4 closes the opening 3, and FIG. , Shows a state in which the manhole cover 4 is tightened in the opening 3.

The manhole 2 opening / closing device 18 is provided on the tank 1 and opens / closes the manhole cover 4 in the manhole 2 including the opening 3 and the manhole cover 4 capable of opening / closing the opening 3. The tank 1 is for a granular material carrier for loading granular materials such as cement, sand, carbon, wheat flour and rice, for tank trucks for loading gasoline, kerosene, light oil, etc., and for various other vehicles. And so on. For example, since the inside of the tank 1 of the powder and granular material carrier has a high pressure, and the tank truck 1 of the tank truck is required to be particularly airtight, the manhole cover 4 of the manhole 2 serving as a loading port thereof is 15 kg. The weight is very heavy from about 40kg. The opening / closing device 18 opens / closes the manhole cover 4 having such a heavy weight.

First, referring to FIG. 1 and FIG. 2, the opening / closing device 18 has the following columns 19, a base 20, a link body 21, a bracket 22, a biasing means 23 and the like. Explaining these in detail, first, the support column 19 is erected on the tank 1 near the opening 3, and is made of, for example, a cylindrical pipe. In the illustrated example, it is erected and fixed on the tank 1. However, instead of this, it may be assembled on the tank 1 so as to be rotatable around its axis. The pedestal 20 is provided on the support column 19 and has, for example, a rectangular box shape, and in the illustrated example, is horizontally rotatable with respect to the support column 19 which is vertically fixed on the tank 1. However, regardless of this, when the support column 19 is rotatably assembled on the tank 1, it is fixed on such a column. In any case, the pedestal 20 is rotatable with respect to the tank 1 in a horizontal or horizontal plane.

Next, the link body 21 of the opening / closing device 18 is swingably attached to the base portion 20 by the first pin 24 at the lower portion. That is, the link body 21 has a lower part swingably assembled by a first pin 24 which is a pivot point, a second pin 25 is planted in the center part, and an upper part is a third pin which is a pivot point. At 26, it is attached to the base end of the bracket 22 so as to be swingable in a vertical or vertical plane. A stopper (not shown) is arranged between the link body 21 and the base portion 20 and between the link body 21 and the bracket 22, respectively, and regulates a predetermined swing limit. Then, two such link bodies 21 are arranged on both sides of each one base portion 20 and bracket 22.

The bracket 22 of the opening / closing device 18 is swingably assembled to the upper portion of the link body 21 by the third pin 26 at the base end portion thereof as described above, and the peripheral end of the manhole cover 4 is attached at the tip end portion thereof. The portion is fixedly held by welding, and the tip end portion is set in a positional relationship in which it can be supported on the base portion 20 by swinging ((2) in FIG. 1 and FIG. 1) See figure). That is, the bracket 22 is in the shape of an arm bent in the middle, and by swinging by the third pin 26, when the link body 21 is vertical, the base end portion is inclined obliquely upward and the lower end. The tip has a size that is supported on the base 20.

Next, the urging means 23 of the opening / closing device 18 has its upper end fixed to the second pin 25 of the link body 21 and has its lower end, for example, a platform, while being routed along the first pin 24. It consists of a spring fixed to the bottom of the part 20. Therefore, the biasing means 23 thus interposed biases the link body 21 upward, that is, the swingable link body 21 in the clockwise direction in the drawing. A total of two such biasing means 23 are provided on the link bodies 21 on both sides, and the biasing force of the biasing means 23 is about half of the mass of the manhole cover 4 via the bracket 22. It is set so that it is biased upward by the force of.

It should be noted that in FIG. 1 (1), reference numeral 14 is a fastening member, and three fastening members 14 are erected on the tank 1 near the opening 3 at predetermined intervals, for example. The manhole cover 4 that closes the opening 3 can be vertically tightened toward the opening 3 by, for example, about 5 mm (see also FIG. 4 (1)). The tightening member 14 in the illustrated example is composed of a threaded rod 15 that is erected on the tank 1 and a tightening bolt 17 that can be screwed into the threaded rod 15. The tightening member 14 radially extends from the peripheral end portion of the manhole cover 4. The manhole cover 4 can be fastened to the opening 3 by screwing the fastening bolts 17 onto the screw rods 15 from above while passing through the blade portions 16 that are individually provided. Further, reference numeral 13 in the drawing is a handle, and this handle 13 is laterally projected from the peripheral end portion of the manhole cover 4, and is used as a handle at the time of opening / closing operation or the like. Further, 27 is a packing, and this packing 27 is provided around the lower surface of the manhole cover 4 in a ring shape and can come into contact with the peripheral wall 28 of the opening 3 from above.

Next, a description will be given with reference to FIG. In the opening / closing device 18 shown in FIG. 3, the swingable assembly of the link body 21 to the base portion 20 is a horizontally long mounting hole provided corresponding to the base portion 20 and the lower portion of the link body 21. 29 and the first pin 24 which can be laterally moved in the mounting hole 29 while being fitted and inserted in the mounting hole 29.

To describe these, the mounting holes 29 in the illustrated example are provided in the lateral direction from both sides of the base portion 20, respectively, and are formed of through-holes communicating with the left and right sides. Correspondingly, the first pin 24 of the illustrated example is fixed from the lower part of the link body 21 on both the left and right sides toward the mounting holes 29 respectively. Since the mounting hole 29 is a through hole as described above, The first pins 24 are connected together in the mounting hole 29. It should be noted that the mounting holes 29 may be provided on the link body 21 side and the first pins 24 may be provided on both sides of the base portion 20 without depending on such an illustrated example. The length of the mounting hole 29 is set so as to correspond to the locus of vertical movement of the manhole cover 4 when tightening it.

Then, the first pin 24 is urged by the urging means 23 interposed in the mounting hole 29, and normally takes the forward position in which the first pin 24 has moved laterally in the direction of the opening 3 ((in FIG. 3). 1) See figure). When the manhole cover 4 is vertically tightened by the tightening member 14 toward the opening 3 as described above, the manhole cover 4 is pressed through the bracket 22 and the link body 21 to resist the urging force of the urging means 23, The retracted position is obtained by moving laterally in the mounting hole 29 in the direction opposite to the opening 3 (see FIG. 3 (2)). In the illustrated embodiment, the urging means 23 for urging the first pin 24 and the urging means 23 for urging the link body 21 upward as described above are of the same type. Alternatively, a dedicated one may be used for each.

The present invention is configured as described above. Then it becomes as follows. That is, in the opening / closing device 18 for the manhole 2 shown in FIGS. 1 and 2, the link body 21 is provided between the bracket 22 that fixedly holds the manhole cover 4 and the base 20 on the support column 19. The upper and lower parts of each are vertically or vertically mounted so as to be swingable. At the same time, the bracket 22 can be directly supported on the base portion 20, and the biasing means 23 for biasing the link body 21 upward is interposed. Then, the opening / closing device 18 is operated as follows.

First, as shown in FIG. 1A, when the manhole cover 4 is held on the opening 3, and the opening 3 is closed and closed, the manhole cover 4 and the bracket 22 of the opening / closing device 18 are connected to each other. The link bodies 21 are laterally or nearly laterally inclined and have a positional relationship of a substantially V shape to a substantially linear shape. In this closed state, the manhole cover 4 is held by the peripheral wall 28 of the opening portion 3 and also by the urging force of the urging means 23 for urging the link body 21 of the opening / closing device 18 upward. Retained and balanced.

Next, while manipulating the manhole cover 4 from the closed state shown in FIG. 1 (1) by the urging means 23, the operating force is reduced to about half, and the height level of the approximately base portion 20 is increased. And slightly push it to the side of the base 20 sideways. As a result, the opening / closing device 18 is swung at the upper and lower portions of the link body 21, respectively, and as shown in FIG. In addition to having a substantially L-shaped positional relationship, the tip portion of the bracket 22 is supported on the base portion 20. Therefore, the manhole cover 4 is mounted on the base 20 through the bracket 22, the link body 21, and the third pin 26 thereof, and the like by the tip portion of the bracket 22 and the first pin 24 at the lower portion of the link body 21. It is supported by and is kept floating above the opening 3 even when the hand is released.

Further, from the floating state shown in FIG. 1B, the base 20 is rotated laterally about the support 19 by about 180 degrees, that is, in the horizontal plane. As shown, the manhole cover 4 is rotated toward the side opposite to the opening 3 via the bracket 22 and the link body 21, and the opening 3 is opened. In this open state in which the opening 3 is completely opened, the manhole cover 4 has the distal end portion of the bracket 22 and the link body 21 via the third pin 26 similarly to the floating state of FIG. It is supported and held on the pedestal 20 by the first pin 24 and the like at the bottom of the. Then, in such an open state, for example, the powder particles 30 are loaded into the tank 1 through the opening 3.

For maintenance, inspection, and repair of the manhole cover 4, etc., the manhole cover 4 should be placed in the closed state shown in FIG. 1 (1) or in the floating state shown in FIG. 1 (2). From the posture described above, the upper and lower portions of the link body 21 are swung to a vertical posture, and the tilted state shown in FIG. 2B is obtained. In this tilted state, the bracket 22 and the link body 21 are vertically or nearly vertically inclined, and are erected from a substantially V shape to a substantially straight line shape, and the manhole cover 4 in the vertical posture is Through the bracket 22, the link body 21, the third pin 26 and the like, it is supported and held on the base portion 20 by the first pin 24 at the lower portion of the link body 21.

Now, according to the switchgear 18 shown in FIGS. 1 and 2, the following first and second aspects are obtained. First of all, in the opening / closing device 18, the above-mentioned respective operations are performed with the third pin 26 and the first pin 24 at the upper and lower portions of the link body 21 and the tip end portion of the bracket 22 as a fulcrum, There are few fulcrums. Further, it is composed of the bracket 22, the link body 21, the base portion 20, the column 19, the urging means 23, etc., and the configuration is simplified and simple as compared with the switchgear 5 of the conventional example of this kind shown in FIG. There are also few parts.

Secondly, the manhole cover 4 is operated between the closed state of FIG. 1 (1) and the floating state of FIG. 1 (2) and the open state of FIG. 2 (1). In doing so, the operating force is reduced to about half by the biasing means 23 that biases the link body 21 upward. Along with this, the manhole cover 4 is placed in a horizontal position through the commonly used closed state of FIG. 1 (1), floating state of FIG. 1 (2), and open state of FIG. 2 (1). As is the case with the above-described conventional opening / closing device 5 of this type shown in FIG. 4, the operating force is greatly reduced without opening / closing in the vertical position by 90 degrees on the vertical surface.

Next, in the opening / closing device 18 shown in FIG. 3, in addition to the configuration shown in FIG. 1 and FIG. 2 described above, the link body 21 to the base 20 can be swung in a vertical or vertical plane. The assembling is performed by the horizontally long mounting hole 29 and the first pin 24 movable in the mounting hole 29. Further, the manhole cover 4 is further tightened to the opening 3 from the closed state of the opening 3 shown in FIG. 1 (1) and FIG. 3 (1), as shown in FIG. 3 (2). In the tightened state, the tightening member 14 can vertically tighten about 5 mm, for example. In the closed state and the tightened state, the manhole cover 4 is brought into contact with the peripheral wall 28 of the opening 3 through the packing 27 on the lower surface thereof and is tightened. Now, in addition to the above-mentioned first and second, the switchgear 18 having the configuration shown in FIG. 3 is as follows.

That is, thirdly, when the manhole cover 4 is tightened, the manhole cover 4 draws a vertical linear movement locus as shown by an arrow in FIG. While descending, the link body 21 and the third pin 26 of the opening / closing device 18 are slanted along a curved locus about the first pin 24, as shown by the arrow in FIG. It swings down (see also the arrow in FIG. 4 (2)). Now, here, the discrepancy between the movement locus of the manhole cover 4 and the movement locus of the link body 21 is that the first pin 24 is urged by the urging means 23 in the mounting hole 29. (1) is pushed against the biasing force of the biasing means 23 and moved to the retracted position shown in (2) of FIG. 3 to be absorbed. In other words, the first pin 24, which is the swing center of the link body 21, laterally escapes in the mounting hole 29 by an amount corresponding to the vertical movement track of the manhole cover 4, so that the movement of the two is performed. Discrepancy in trajectories is absorbed. Therefore, unlike the conventional example of this type shown in FIG. 4, stress is not applied to the manhole cover 4, the bracket 22, the link body 21 and the like due to the force due to the disagreement, and the stress is eliminated. To be done.

[0034]

[Effect of device]

 First, as described above, the manhole opening / closing device according to the first aspect of the present invention is such that the link body is mounted between the bracket holding the manhole cover and the base portion so as to be swingable at the upper and lower portions, respectively. It is also possible to directly support the bracket on the base part, and the link body is provided with an upward biasing means, so that the following effects are exhibited.

That is, first, the number of supporting points is small, the structure is simple, and the number of parts is small. Therefore, this switchgear is relatively low in price, lighter in weight, more durable, and easier to maintain, inspect, and repair. This switchgear is price, weight, durability, maintenance, and inspection. It is excellent in terms of repair. Secondly, when the manhole cover is operated between the closed state, the levitated state and the open state, the operation force is reduced, and thus the opening / closing device is excellent in workability.

Next, in the manhole opening / closing device according to claim 2 of the present invention, the swingable assembly of the link body to the base part is further provided with a horizontally long mounting hole and an advancing position in the mounting hole. In addition to the above-described first and second effects, the following effect is exhibited by implementing the operation with a pin that can move between the retracted positions.

That is, thirdly, when the manhole cover is tightened, the disagreement of the movement loci of the manhole cover and the link body is absorbed. Therefore, the manhole cover 4, the link body, and the opening / closing device such as the bracket are not applied with a force due to the inconsistency and do not act on the opening / closing device. Therefore, damage or damage to them is prevented and durability is improved. Thus, the effects of the present invention are remarkable and great, such as the problems existing in this type of conventional example are eliminated.

[Brief description of drawings]

1A and 1B are front explanatory views of an embodiment of a manhole opening / closing device according to the present invention. FIG. 1A is a state in which a manhole cover is closed, and FIG. The state of being floated up is shown respectively.

2A and 2B are front explanatory views of the same embodiment, FIG. 1A shows a state in which the manhole cover has opened the opening, and FIG. 2B shows a state in which the manhole cover is tilted from the opening.

FIG. 3 is a front explanatory view of an essential part of the embodiment of the manhole opening / closing device according to claim 2 of the present invention, wherein FIG. 1 (1) shows a state in which the manhole cover closes the opening, and FIG. Is
The state where the manhole cover is fastened to the opening is shown.

FIG. 4 shows a manhole opening / closing device according to a conventional example,
(1) is a plan view of the manhole cover with the opening closed, (2) is a front view of the manhole cover tightened in the opening, and (3) is a view of the manhole cover open. It is a front explanatory view in the state where the section was opened.

[Explanation of symbols]

 1 Tank 2 Manhole 3 Opening 4 Manhole Cover 14 Tightening Member 18 Switchgear 19 Strut 20 Stand 21 Link Body 22 Bracket 23 Energizing Means 24 1st Pin (pin) 29 Mounting Hole

Claims (2)

[Scope of utility model registration request] 1. A manhole cover opening / closing device for a manhole, which is provided on a tank and comprises an opening and a manhole cover capable of opening and closing the opening, the standing device being provided on the tank near the opening. Struts, a base provided on the stanchions and rotatable laterally with respect to the tank, a link body that is swingably assembled to the pedestal at a lower portion, and a link at a base end portion. A bracket which is swingably assembled to the upper part of the body, holds the manhole cover fixedly at the tip, and has a positional relationship such that the tip can be supported on the base by swinging; And a biasing means biased to bias the link body upward, and an opening / closing device for a manhole. 2. The manhole opening / closing device according to claim 1, wherein the swingable assembly of the link body to the base portion is provided corresponding to the base portion and a lower portion of the link body. ,
It is implemented with a horizontally long mounting hole and a pin that is fitted and inserted into the mounting hole and can move laterally in the mounting hole, and
A fastening member is erected on the tank near the opening, and the fastening member is capable of vertically fastening the manhole cover closing the opening toward the opening. In the mounting hole is moved forward by being biased by the biasing means moved laterally toward the opening, and the manhole cover is vertically tightened by the tightening member toward the opening. An opening / closing device for a manhole, characterized in that when it is pushed, it is pushed through the bracket and the link body to take a retracted position which has moved laterally in the direction opposite to the opening against the biasing force of the biasing means.