JPH1018327A - Manhole cover cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a cutting device with excellent operability and being capable of selectively cutting part of the surface of a manhole cover easily and quickly without moving the manhole cover itself from an installation position. SOLUTION: A cutting device roughly consists of a base late 2 separate from a device mainbody with an opening at the center, a disc turning table 4 to turn on the base plate 2, a cutting part 5 with a rotating center adjustable to a position different from the turning center of the turning table 4 and a cutting part elevation holder possible to such the cutter 5 against a cut position on a manhole cover 1. The cut position on the manhole cover 1 is accurately cut with the auto-rotation of the cutter 5 and the revolution of the cutter 5 by the turning of the turning table 4. Only with the auto-rotation of the cutter 5, a memory element storage hole can be also opened in any position on the manhole cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover cutting device, and more particularly to a cutting device for selectively cutting only a specific portion such as a mark portion of a manhole cover. The manhole cover to be covered by the present invention means a cover that covers a manhole that is a vertical hole for an operator to enter the underground or an underpass, and the present invention relates to a cover that covers a handhole that does not allow an operator to enter. Therefore, the manhole cover according to the present invention will be described as including a handhole cover.

[0002]

2. Description of the Related Art Generally, a manhole cover is made of cast iron having a circular or rectangular shape and a large weight and thickness, and is used by being fitted into a "manhole cover receiving frame" at the upper edge of a manhole buried underground. In general, a mark indicating the owner is displayed on the center of the manhole cover.

The present inventors have developed a cutting device for cutting an arbitrary portion (mainly, a central portion) on the surface of a manhole cover over an appropriate depth and range. (Japanese Patent Application Laid-Open No. Hei 7-137754) has proposed a method of attaching an emblem or the like having the necessary information display and a cutting device therefor. Similarly, an application has been made for a manhole cover in which a small-diameter hole is formed at an arbitrary position on the surface of the manhole cover body and a storage element in which necessary information is written is embedded (Japanese Patent Application Laid-Open No. 7-281856).
issue).

[0004]

According to the cutting device and the manhole cover of the prior application as described above, the owner mark on the upper surface of the ready-made manhole cover can be corrected, or a new part can be added to any part of the ready-made manhole cover. It is possible to add the display of various information, and it is possible to expect the effect that the manhole cover, which can be used with sufficient strength, does not need to be discarded or renewed just for the purpose of displaying it. Sex was found to be quite high.

However, when a manhole cover cutting device was actually manufactured and put into practice, it was found that there was still room for improvement in terms of structure and operation. That is,
The cutting device proposed in Japanese Patent Application Laid-Open No. Hei 7-137754 has a considerable weight and has a problem in handling. In particular, when setting on a manhole cover which is a workpiece,
There is a disadvantage that the alignment is not easy. In addition, since the horizontal position of the cutting blade cannot be adjusted after the setting of the apparatus, a position where cutting can be performed and a desired cutting position may be shifted in some cases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a more practical cutting device having a structure as light as possible and easy to align with a manhole cover. .

In addition to the case where the cutting device is set at a site such as a road where a manhole is already installed, the present invention also includes an operation of moving the manhole cover from the site and processing it in a factory. .

[0008]

The gist of the present invention to achieve this object is as follows. (1) a base plate formed separately from the main body of the cutting device and having an opening in the center installed on a manhole cover;
A pivotable disc-shaped revolving table detachably provided on the base plate, and an optional portion of a manhole cover mounted on the revolving table so that the revolving center can be moved to a position different from the revolving center. A cutting part capable of cutting the cutting part, and a cutting part elevating and lowering holding part capable of pressing a cutting blade attached to a tip part of the cutting part against a cut part of a manhole cover. A manhole cover cutting device, which cuts a desired cut portion of a manhole cover by revolving a cutting blade by a turning operation. (2) The cutting apparatus according to (1), wherein a plate for holding and fixing the lower portion of the cutting portion is provided, and the plate is provided so as to be slidably fixed over a fixed range with respect to the rotating table.

In the present invention, a relatively lightweight base plate is first moved above the existing manhole cover to be cut, and the base plate is firmly fixed by inserting a positioning pin into the cover keyhole and rotating the base plate. After holding and fixing to the manhole cover and aligning the position, the cutting device body is hung by a crane or the like and placed on the base plate. After the swivel table and the base plate are aligned, the cutting blade is lowered and the cover Press against the cutting point,
Due to the rotation of the cutting blade itself or the revolution of the cutting part due to the rotation of the turning table and the rotation of the turning table, a portion to be cut, for example, a mark portion at the center of the manhole cover is scraped over a certain depth or a certain depth and range. When the existing manhole cover can be moved or when the manhole cover is processed before being set in a predetermined place, the manhole cover is brought under the cutting device to perform the cutting process. It goes without saying that it can be done.

[0010] A rubber mark or the like which displays a new mark or various information is attached to the concave portion or hole on the manhole cover which has been scraped off by any of the methods, or a storage element storing desired information is stored. Embed. The cutting part may be any place as long as it is the surface of the lid, and the new indication is the maker, installation date, control number, pattern, color, direction and indication of north, south, east, west, sights, evacuation place in case of disaster , May be anything. Further, the rotation of the cutting blade and the start and stop operations of the revolution of the swivel table can be automatically performed by providing means such as a control panel and limit switches.

The manhole cover is not limited to one having a different size or a circular shape, but may have a rectangular shape or a different cutting range. Therefore, the shape of the cutting blade may be changed, or the positions of the positioning pins and the cutting blade portion may be changed. It is preferable that the relationship and the revolving radius of the cutting part can be adjusted so that the manhole cover can be applied to a plurality of types of manhole covers.

In the present invention, the emblem means a material made of rubber, resin, metal, pottery, or the like, and having the above-mentioned manhole owner badge or the like. In addition, a storage element is an element that stores information necessary for a manhole and can read the information arbitrarily. For example, a semiconductor chip or the like is used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutting device according to the present invention will be described below with reference to the drawings. FIG. 1 is a front cross-sectional view of the cutting device, showing a state before mounting the device main body on a base plate, and omitting an elevating mechanism. FIG. 2 is a plan view showing a base plate and a swivel table, and FIG. 3 is a front sectional view selectively showing an elevating mechanism of the cutting device.

As shown in the figure, the cutting device is formed separately from the device main body, and has a positioning plate 3 at a position corresponding to a keyhole of a manhole cover 1 and an opening 2a at the center. A swivel table 4 which is held so as to be swivelable about the center of the manhole cover 1 above, and a swivel table having a center of rotation between a position coinciding with the swivel center of the swivel table 4 and a position separated from the swivel center. A cutting unit 5 mounted thereon, a cutting blade rotating spindle motor 6 connected above the cutting unit 5,
The cutting part 5 is connected to the base plate 2 or the opening 2a of the turning table.
And a lifting / lowering mechanism 8 having a blade raising / lowering motor 7 for holding the cutting portion 5 and the spindle motor 6 so as to be able to be raised and lowered so as to be able to be pressed against the cut portion of the lid 1.

The base plate 2 is disk-shaped, has a large-diameter opening 2a at a central portion, has guide blocks 2b at a plurality of peripheral portions, and has a circular through-hole of the manhole cover 1 having a notch in the diameter direction. A positioning pin 3 is provided at a position corresponding to the keyhole. The upper portion of the positioning pin 3 has a screw portion for screwing the lock nut, and the lower portion of the pin is a cross-shaped lock pin.

The disc-shaped turning table 4 is an enlarged view of a base plate, a turning table and a turning mechanism shown in FIG.
As shown in the figure, the fixing plate 9 is disposed below the lower surface of the fixing plate 9 via a bearing 13. The fixing plate 9 is fixed to the base plate 2 via a positioning protrusion 10. For example, as shown in FIG. 4, if the positioning projections 10 are provided in advance at a plurality of locations on the front surface side of the base plate 2 and the concave portions are provided on the back surface side of the fixing plate 9 corresponding to these, the base plate 2 can be put on the manhole cover first. After setting in the predetermined position of 1. When the apparatus main body is mounted thereon, the positioning can be easily performed by matching these concave and convex portions.

The swivel table 4 is rotatably held with respect to the fixed plate 9. The swivel mechanism is a pinion gear that is rotated by a swivel motor 11 provided on the fixed plate 9 via a bracket or the like. 12 and
A gear 4a provided on the outer periphery of the turntable 4 so as to mesh with the gear 12. The turning table 4
It is desirable to provide a limit switch 14 in order to accurately control the automatic stop of the turning operation of the vehicle.

On the upper surface of the swivel table 4, an apparatus main body holding plate 15 whose horizontal position can be adjusted relative to the table is placed. The mechanism for adjusting the relative position between the holding plate 15 and the swivel table 4 includes:
As shown in FIG. 2, a plurality of elongated holes 15a of a fixed length facing the same direction are formed on the holding plate side, and the pins 4b attached to the turning table 4 side are inserted into the holes, and fixed at appropriate positions. Adjust by doing. By adjusting the relative position, the center of rotation of the swivel table 4 and the center of rotation of the cutting part are shifted or made to coincide with each other to change the cutting area during cutting or change the cutting location. A two-dot chain line on the left side of the holding plate 15 in FIG. 4 indicates a position where the plate is shifted.

Further, on the apparatus main body holding plate 15,
Four shafts 16 and at least two lifting gears 17 are erected at equiangular positions in a plane.
The cutting portion 5 is slidably held in the vicinity of the center position of the apparatus main body via a sliding block 18. The cutting portion 5 is also connected to the lifting gear 17 via a nut portion 19 so as to be vertically movable. One upper end of the elevating gear 17 is connected to the elevating motor 7 held on a shaft, and is rotated by the driving of the motor 7. The elevating gear 17 is engaged with the nut portion 19, and The rotation of the gear 17 causes the nut portion 19 to move up and down, whereby the cutting portion 5 also moves up and down. The control of the raising / lowering position of the cutting unit 5 may be performed using the limit switch 24 as appropriate. An opening is formed at the center of the apparatus main body holding plate 15 in the same manner as the base plate 2 and the swivel table 4.

FIGS. 5 and 6 are a front view and a plan view, respectively, showing the details of the cutting section elevating mechanism. The lower end of the elevating gear 17 is supported on the apparatus main body holding plate 15 via a bearing.
An output shaft 7a of the lifting motor 7 is connected to the upper end of any one of the lifting gears 17, and a driving pulley 20a is provided on the output shaft 7a. Driving force is transmitted to the driven pulley 20d via 20b and 20c. The two elevating gears 17 rotate around the axis by the driving of the elevating motor 7, which moves the nut portion 19 up and down, and moves the cutting portion 5 and the spindle motor 6 up and down between the upper limit position and the lower limit position (cutting position). .

FIG. 7 shows the details of the cutting portion. The cutting portion 5 held via a sliding portion 18 having a bush or the like built into the shaft 16 is rotatable about an axis at the center. A vertically extending shaft body 22 supported via a bearing or the like is provided. A cutting blade portion 23 is provided at a lower portion of the shaft body 22, and an upper portion thereof is connected to the output shaft 6 a of the spindle motor 6.
The cutting blade portion 23 can be replaced with a blade of another size or type as appropriate.

Next, a cutting operation according to the present invention using the illustrated apparatus will be described. The cutting device and related equipment are loaded on a work vehicle or the like and transported to a manhole position to be cut. First, the separate base plate 2 is placed on the manhole cover 1, and the positioning pin 3 is inserted into the keyhole of the cover 1. Then, the base plate 2 is fixed to the manhole cover 1 with a lock nut or the like after rotating 90 degrees. Next, the main body of the cutting device is suspended on the base plate by a crane or the like, and positioning is performed using the projections 10 of the base plate 2 and the concave portions on the bottom surface of the swivel table 4. In this case, if it is determined in advance what part of the manhole cover is to be cut over which depth and range, the positional relationship between the turning table 4 and the cutting part 5 is determined by adjusting the elongated hole 15a and the pin 4b. Is determined by fixing the position of. In addition, the cutting blade may be replaced with an appropriate cutting blade (cutting tip) according to the case where the cutting is performed while turning by a certain range or the case where a small-diameter storage hole such as a storage element is simply opened. In the illustrated example, a case where a certain range of the center mark portion of the manhole cover is cut will be described.

In the present invention, in order to reduce the weight of the main body of the cutting device as much as possible, extra parts and members are omitted as much as possible, portions which can be directly connected to the drive unit are directly connected, and further, each drive source is connected. The motors are downsized to reduce the weight, and the accompanying devices and supporting parts are simplified.
The separate construction of the base plate also contributes greatly to the weight reduction of the apparatus main body. By the way, the apparatus (excluding the base plate) of the present invention (excluding the base plate) was able to achieve a weight reduction of about 300 kg as compared with the cutting apparatus (weight: about 800 kg) of Japanese Patent Application No. 7-137754. In addition, such downsizing of motors causes a reduction in driving force required for cutting, but in the present invention, cutting depth and range are reduced by devising a cutting operation as described later. Has been resolved without.

For example, if the cutting blade has a side surface, the spindle motor 5 is driven to rotate the cutting blade 23, and at the same time, the elevating motor 8 and the turning motor 11 are started, and the elevating mechanism 7 is operated. The rotating cutting blade portion 23 is lowered through the intermediary portion, and is pressed against the cut portion of the manhole cover 1 and is simultaneously turned to start cutting. The amount of deviation between the center of rotation and the center of rotation of the cutting blade determines the revolution diameter of the cutting blade. The cutting area is cut by the rotation, lowering and turning of the cutting blade 23, and the cut portion 1b of the manhole cover 1 (for example, FIG.
Mark the center part of the lid). The rotation of the turning table 4 is stopped by the operation of the limit switch attached to the cutting end point to stop the turning of the turning table 4, and then the elevating motor 7 operates to raise the cutting blade, and at the same time,
The spindle motor 6 stops. The cutting end point is the revolution angle of 3
If it is set at an angle slightly more than 60 °, the uncut residue can be eliminated.

Normally, when the cutting blade is revolved 360 ° to cut the cutting area, in order to avoid entanglement of the power cable or the like, the rotation in only one direction is stopped, the turning motor is rotated in the reverse direction, and the cutting start point is returned again. Work is performed. Therefore,
In the present invention, at the time of the first 360 ° revolution, 1/1 / the target cutting depth is obtained.
2 and then the remaining 1 /
If the cutting is performed at a depth of 2, the cutting power does not need to be excessively large, and the load applied to the cutting tip can be reduced.
The overall structure can be reduced in weight, and the life of the cutting part can be extended.

When the cutting is completed, the main body of the apparatus is separated from the base plate, and this operation is the reverse of the mounting operation described above. That is, the positioning pin may be turned and pulled out of the lid, the apparatus body may be lifted and moved by a crane, and then the base plate may be removed from the manhole lid.

FIG. 8 shows another embodiment of the present invention, which is a traveling cart system in which an operator can directly move to the site by hand. The structure of the turning table and the device main body of the cutting section are exactly the same as those in FIG. 1, but the hoisting / lowering driving device 25, the chain, etc. Hangs the entire device. A caterpillar can be used instead of the gantry wheel 26, and in some cases, it can be a self-propelled type. After setting the separate base plate on the manhole cover, the cutting device may be moved to lower the entire device on the base plate to align the cutting device with the base plate, and the same operation as described above may be performed.

In the illustrated example, cutting of the center mark portion of the manhole cover has been described. However, the present invention is not limited to this, and can be used for cutting other portions of the manhole cover. It is also possible to add a display such as a maker name, a production date, a management number, a pattern, a color, names and directions of east, west, north and south directions, sights or evacuation sites in the event of a disaster.

[0029]

As described above, according to the cutting device of the present invention,
With the manhole cover in place, it is possible to easily and quickly cut a part of the cover surface selectively and reliably, without having to replace it with a new cover, removing inconvenient indications or changing to other indications. In addition, it is possible to easily perform a new display or to provide a hole for accommodating a storage element storing information in some cases. In addition, since the base plate is configured separately from the main body of the device, work such as initial positioning is easy, and the actual operation is easy and reliable by reducing the weight of the overall structure as much as possible. And the practicality has improved.

[Brief description of the drawings]

FIG. 1 is a front view of a partial cross section showing one embodiment of a cutting device according to the present invention.

FIG. 2 is a plan view of a portion of the device shown in FIG. 1 excluding a cutting portion.

FIG. 3 is a side view of the apparatus shown in FIG. 1;

FIG. 4 is an enlarged explanatory view of a lower portion of the device shown in FIG. 1;

FIG. 5 is an enlarged explanatory view of a cutting section elevating mechanism in the apparatus shown in FIG. 1;

FIG. 6 is a plan view showing an example of an elevating mechanism of the apparatus shown in FIG.

FIG. 7 is an enlarged explanatory view of a cutting section in the apparatus shown in FIG.

FIG. 8 is a front sectional view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Manhole cover 2 Base plate 3 Positioning pin 4 Rotating table 5 Cutting part 6 Rotating motor 7 Lifting motor 8 Lifting mechanism 9 Fixed plate 10 Positioning protrusion 11 Rotating motor 12 Rotating gear 13 Bearing 14, 24 Limit switch 15 Device main body holding plate 16 Shaft 17 Elevating gear 18 Sliding part 19 Nut part 20 Pulley 21 Belt 22 Shaft body 23 Cutting blade part 24 Stand 25 Hoisting / lowering driving machine 26 Wheel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Niwa 2-3-13 M & C Building, Kanda Ogawamachi, Chiyoda-ku, Tokyo Tokyo, Awaji Sangyo Co., Ltd.

Claims (2)

[Claims] 1. A base plate having a central opening formed on a manhole cover, formed separately from a cutting device main body, a revolvable disk-shaped revolving table removably provided on the base plate, A cutting portion mounted on the table so that the center of rotation can be moved to a position different from the center of rotation of the table and capable of cutting an arbitrary portion of the manhole cover, and a cutting blade attached to the tip of the cutting portion is a manhole cover. And a cutting section liftable holding section which can be pressed against the cut portion of the manhole, and cuts the desired cut portion of the manhole cover by the rotation of the cutting blade or the revolution of the cutting blade by this rotation and the turning operation of the turning plate. A cutting device for a manhole cover, characterized in that: 2. The cutting device according to claim 1, further comprising a plate for holding and fixing the lower portion of the cutting portion, and the plate being provided so as to be slidably fixed on the swivel table over a predetermined range.