JPH072708Y2 - Square manhole cover opening / closing tool - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a lid opening / closing tool for a rectangular manhole, and in particular, the lid can be opened and closed without placing a heavy burden on the waist of an operator, and is compact. Provides convenient storage.

《Background of the invention》 As a square manhole, the applicant of the present invention has already put it into practice.
I proposed the one shown in Japanese Patent Publication No. 77.

This is a manhole 1 as shown in FIGS. 1 and 2.
A rectangular lid receiving frame 3 is internally provided in the receiving hole 2 of this, and a rectangular lid body 4 is fitted into this lid receiving frame 3, and a pair of play is provided at both corners 5 on the lower surface of one end side 11 of this lid body 4. The rolling wheels 6 are attached, and a pair of guide rails 8 for guiding the rolling of the free rolling wheels 6 are attached to the inner wall surface 7 of the lid receiving frame 3. One end of the guide rails 8 moves the free rolling wheels 6 to a low position. It is formed as a guide starting end portion 9 for holding and holding the lid body 4 in a position to be fitted into the lid receiving frame 3, and the other end portion of the guide rail 8 holds the idler wheel 6 at a high position to cover the lid body 4. Formed as a guide end portion 10 to be detached from the body frame 3,
The lid body 4 is configured to be opened and closed by pushing and pulling the lid body 4 in the horizontal direction while the other end side 12 of the lid body is lifted. Generally, this type of rectangular manhole cover 4 is 50
Many of them are heavy, weighing over 0 kg, and direct lifting work by human power is almost impossible.

<< Prior Art >> As an opening / closing tool for opening and closing the cover of such a rectangular manhole, there is the one of the above-cited Japanese Utility Model Publication No. 60-20677.

This is configured such that the other end of the lid is connected to the tip of the hoisting arm and the base end of the hoisting arm is pushed down, so that the lid can be lifted in an inclined state by levering with the wheel as a fulcrum. In addition, the lid body that has been lifted up is configured so that it can be pushed and pulled in the horizontal direction through the rolling of the wheels.

<Problems to be solved by the invention> However, since this conventional device does not have a lifting operation means, it is necessary to manually push down the base end of the lifting arm to lift a large-weight lid, which is a problem for an operator. It puts a heavy burden on the waist.

Moreover, since there is no means for holding the heavy lid in the suspended state, it is necessary to push and pull the lid horizontally while manually maintaining the suspended state, which again places a heavy burden on the waist of the operator. It takes.

In order to reduce the burden on the waist of the worker, it is possible to increase the distance between the wheel as a fulcrum and the base end of the lifting arm as a power point, but in this case, the total length of the lifting arm is long. Therefore, a new problem arises that the storage becomes inconvenient.

The present invention has been made in view of the above-mentioned conventional problems, and is a rectangular manhole that can open and close the lid without putting a heavy burden on the waist of the operator, and is compact and convenient to store. An object is to provide a lid opening / closing tool.

<< Means for Solving the Problems >> As shown in the drawings, for example, the present invention has a square lid receiving frame 3 internally provided in a receiving hole 2 of a manhole 1, and a square lid 4 is fitted into the lid receiving frame 3. Then, a pair of idler wheels 6 are attached to both corners 5 on the lower surface of the one end side 11 of the lid body 4, and a pair of guide rails 8 for guiding the rolling of the idler wheels 6 are provided on the inner wall surface 7 of the lid receiving frame 3. The guide rail 8 is attached, and one end portion of the guide rail 8 is formed as a guide starting end portion 9 for holding the lid body 4 at a position where the lid body 4 is fitted into the lid receiving frame 3, and the other end portion of the guide rail 8 is detached from the lid receiving frame 3 by the lid body 4. The lid body 4 is formed as the guide terminal portion 10 and is connected to the other end side 12 of the lid body 4 of the manhole 1 configured as described above to push and pull the lid body 4 horizontally in an inclined state in which the lid body 4 is pulled. A lid opening / closing tool 13 for opening and closing the lid 4 of a rectangular manhole configured to open and close a front wheel 15 A handle 18 is provided at the rear of the gantry 14 and a base end of a hoisting arm 19 is pivotally supported so that the hoisting arm 19 can be swung in the vertical direction. A connecting portion 22 that connects the other end 12 of the lid 4 is provided at the tip of the arm 19, and a telescopic actuator 25 that vertically extends and contracts is erected at a position behind the front wheel 15 on the gantry 14, The expansion / contraction operation device with the upper end of the expansion / contraction operation device 25 connected to the midway part of the suspension arm 19 with a predetermined degree of freedom, and the connection part 22 of the suspension arm 19 connected to the other end 12 of the lid 4.
22 is extended so that the lid body 4 can be lifted up in an inclined state, and the lid body opening / closing tool 13 becomes a forward leaning state with the front wheel 15 as a fulcrum to keep the balance while the lid body 4 is being hung up. As configured.

<Operation> For example, as shown in FIG. 1, by extending and contracting the telescopic actuator 25 while the connecting portion 22 of the lifting arm 19 is connected to the other end 12 of the lid 4, the lifting arm 19 is moved. The other end 12 of the lid 4 is lifted in a state of being pivoted around the pivot point of the base end, and the other end 12 of the lid 4 is in a hoisted state, but the load of the lid 4 causes the lid opening / closing tool 13 to use the front wheel 15 as a fulcrum. In the forward leaning state, the lid body 4 is lifted in an inclined state to keep the balance with the lid body opening / closing tool 13.

Then, when the handle 18 is pulled in the horizontal direction in the same state, the lid opening / closing tool 13 moves in the horizontal direction as the front wheels 15 roll,
Following this, the inclined lid body 4 is pulled in the horizontal direction,
The lid 4 is an idle wheel 6 guided along a guide rail 8.
Move horizontally through the rolling of.

At this time, the idle wheel 6 is lifted from the low position to the high position by reaching the guide start end 9 of the guide rail 8 to the guide end end 10, and the lid 4 is separated from the lid receiving frame 3 and opened. Become. Also, when the lid 4 is to be put back in its original position,
When the handle 18 is pushed horizontally, the lid opening / closing tool 13
The horizontal movement of the rolling wheels 6 is caused by the rolling of the guide rail 8, and the rolling wheels 6 move from the guide end portion 10 to the guide start end portion 9 of the guide rail 8 to move from the high position to the low position, contrary to the case of the opening, and the lid is closed. The body 4 is fitted in the lid receiving frame 3.

<< Effect of Device >> Since the device of the present invention is configured and operates as described above, the following effects can be obtained.

a) Since the other end of the lid body is lifted by the hoisting arm due to the extension operation of the telescopic actuator, it is not necessary to manually lift the lid body, and it is necessary to lift the lid body by the leverage of human power. Compared to the conventional one, the operator's waist is not burdened during the lifting operation of the lid.

b) Moreover, since the other end of the lid is hoisted by the mechanical force of the telescopic actuator, compared to the conventional one in which the total length of the hoisting arm needs to be lengthened in order to obtain a large lever action with a small human effort. The total length of the lifting arm can be shortened, making it convenient to store.

c) In addition, since the balance is kept in balance with the lid opening / closing tool while the lid is in the suspended state, human power is not required to maintain the suspended state of the lid, and the lid is retained in the suspended state by the leverage of human power. Compared to the conventional one in which the lid body needs to be horizontally moved as it is, the waist of the worker is not significantly burdened during the horizontal movement work of the lid body.

d) Further, the lid body is lifted by a fulcrum at its one end side, and the lever force point is farther from the fulcrum than the center of gravity of the lid body, and the position where the lifting arm and the telescopic actuator are connected. Therefore, due to the lever action, the telescopic actuator can lift the lid with a relatively small force. Moreover, since the telescopic actuator extends upward, there is no limit to the range in which the telescopic actuator can expand and contract, and therefore the lid can be lifted to a sufficient height.

e) Further, when the expansion / contraction actuating device is extended and the lid is lifted, the lid opening / closing tool is in the forward leaning state with the front wheel as a fulcrum. Therefore, for example, even if soil or the like is clogged between the lid body and the lid receiving frame, making it difficult to lift the lid body by the lifting arm, it is difficult to lift the lifting arm, so that the front opening of the lid opening / closing tool is The gantry is pushed backward and moves backward. In other words, even if the telescopic actuator is extended in a state where it is difficult to lift the lid due to clogging with earth and sand, the platform is prevented from retracting and the extension force of the telescopic actuator is applied to the lifting arm. It is possible to prevent the arm from bending.

<< Embodiment >> An embodiment of the present invention will be described with reference to the drawings.

1 and 2 are explanatory views of a lid opening / closing tool according to a first embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a plan view, and reference numeral 13 is a lid opening / closing tool. Show.

Reference numeral 14 is a pedestal. A pair of left and right front wheels 15 are rotatably attached to the front of the pedestal 14, and a single rear wheel 16 is rotatably attached to the rear of the pedestal 14. There is.

A stay 17 is provided upright on the rear portion of the gantry 14, a round bar handle 18 is horizontally installed on the upper portion of the stay 17, and a base end portion of a lifting arm 19 is pivotally supported at a central portion of the handle 18.

The hoisting arm 19 has a slanting portion 21 that is slanted downward from the tip of the horizontal portion 20 on the base end side, and a tip end of the slanting portion 21 is provided with a connecting portion 22 that connects the other end side 12 of the lid body 4. Has been.

The connecting portion 22 is provided with an insertion hole 24 through which a connecting tool 23 that is detachably attached to the other end 12 of the lid 4 is inserted in a state in which it does not come off.

Further, a hydraulic jack 25 (expansion / contraction operation device) is erected on the pedestal 14, and an upper end portion of the hydraulic jack 25 has a predetermined degree of freedom via a universal joint 26 and a horizontal portion 20 of the lifting arm 19. Are connected to the bottom surface of. The upper end of the hydraulic jack 25 may be formed in a hemispherical shape without using the universal joint 26 and may be brought into contact with the lower surface of the horizontal portion 20 of the lifting arm 19, and in this case also, a predetermined degree of freedom can be obtained. To be

That is, the hydraulic jack 25 is extended while the connecting portion 22 of the hoisting arm 19 is connected to the other end 12 of the lid 4 via the connecting tool 23, so that the front wheel 15 is used as a fulcrum for the lid 4.
Is configured so that it can be lifted in an inclined state, and the lifted lid can be pushed and pulled horizontally by rolling the front wheels 15.

FIG. 3 shows a plan view of the second embodiment, in which the front part of the mount 14 is formed as a bifurcated branch 27,
The front wheels 15 are respectively provided at the tips of the respective branch portions 27, the branch portions 27 bypass the outer periphery of the lid receiving frame 3, and the front wheels 15 are positioned on both outer sides of the lid receiving frame 3.

[Brief description of drawings]

The drawings are all views for explaining a lid opening / closing tool according to an embodiment of the present invention. FIG. 1 is a side view of the first embodiment, FIG. 2 is a plan view of the first embodiment, and FIG. It is a top view of an example. 1 ... Manhole, 2 ... Receiving hole, 3 ... Lid receiving frame, 4 ...
Lid, 5 ... Corner, 6 ... Idler wheel, 7 ... Inner wall surface, 8
…… Guide rail, 9 …… Guide start end, 10 …… Guide end, 11 …… One end of the lid, 12 …… The other end of the lid, 13
...... Lid opening / closing tool, 14 ...... Stand, 15 ...... Front wheel, 16 ...... Rear wheel, 18 ...... Handle, 19 ...... Lifting arm, 22 ...... Coupling part, 25 ...... Telescopic actuator.

Claims (1)

[Scope of utility model registration request] 1. A rectangular lid receiving frame (3) is provided in a receiving hole (2) of a manhole (1), and a rectangular lid body (4) is fitted into the lid receiving frame (3). A pair of idler wheels (6) are attached to the lower corners (5) of one end side (11) of the body (4), and the idler wheels (6) are attached to the inner wall surface (7) of the lid receiving frame (3). ) Is provided with a pair of guide rails (8) for guiding rolling of the guide rails (8), and one end of the guide rails (8) is held at a position where the lid body (4) fits into the lid receiving frame (3). Part (9), and the other end of the guide rail (8) is formed as a guide terminal part (10) for separating the lid body (4) from the lid receiving frame (3). The lid body (4) is connected to the other end side (12) of the lid body (4) of the manhole (1) and is pushed up and down in a slanted state to push the lid body (4) horizontally. A lid opening / closing tool (13) for opening and closing a lid (4) of a rectangular manhole configured to open and close 4), the rear part of a gantry (14) having front wheels (15) at the front. Is provided with a handle (18), and the base end of the lifting arm (19) is pivotally supported so as to be vertically swingable, and the tip end side of the lifting arm (19) is located in front of the front wheel (15). And a connecting portion (22) for connecting the other end side (12) of the lid (4) to the tip of the lifting arm (19), and the front wheel (15) on the mount (14). A telescopic actuator (25) that vertically expands and contracts is installed at a rearward position, and the upper end of the telescopic actuator (25) is connected to the middle part of the lifting arm (19) with a predetermined degree of freedom. Then, connect the connecting portion (22) of the lifting arm (19) to the lid body (4).
In the state of being connected to the other end side (12) of the
The lid body (4) is constructed so as to be lifted in an inclined state by extending the lid body (4), and the lid body opening / closing tool (13) causes the front wheel (4) to be lifted while the lid body (4) is being hung. A lid opening / closing tool for a rectangular manhole, characterized in that the balance is maintained in the forward leaning state with the 15) as a fulcrum.