JP4473545B2 - Drilling device for cable distribution box - Google Patents

Description

  The present invention relates to a cable wiring box drilling device for making a hole in a wall plate at a cable wiring box mounting position covered with a wall plate and opening the wiring box.

  Conventionally, the drilling device for cable distribution boxes is usually used by carpenters after gypsum boards, combination panels (calc panel), calcium silicate (calcal) boards, etc. are pasted by carpenters in the construction of new and expanded houses. Then, a sticking work for attaching a cable wiring box of an outlet or a switch to a predetermined position is performed by a person in charge of electrical work. The cable wiring box that was blindfolded by the wallboard affixing work was hurt on the wallboard because the position of the cable wiring box can be specified by detecting the position of the cable wiring box with a search sensor and putting a marking line on the wall. Make a large hole in the position and open the cable distribution box.

2. Description of the Related Art Conventionally, as a tool for making a large hole, a hole saw in which a saw blade-like cutting edge is formed at a cylindrical tip and a rotary cutting blade is formed is known (for example, see Patent Document 1). Since a hole saw is likely to be clogged, a drilling device is known that rotates a two-blade improved in its drawbacks to make a large hole (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 5-13112 (pages 1 and 2, FIGS. 1 and 4) JP 2001-121492 A (1-2 pages, 1-9)

However, clogging can be eliminated by using a conventional saw blade-shaped cutting blade made of two cutting blades, but usually a minimum of two holes, such as a dart hole, are used. Since parts overlap, it is inevitably intermittent cutting. Since this intermittent cutting has a large load on the cutting edge, there is a problem that the life is fast, and if a deep hole is drilled, the cutting time becomes long and the efficiency is poor.
In addition, the conventional cable wiring box drilling device has a problem that in the drilling work for two or more boxes, it is necessary to insert a marking line in the center of the box in order to specify the drilling position, which is troublesome. It was.

  Therefore, the present invention was devised to solve such a problem, and while preventing damage to the blade portion in a short time, an efficient hole capable of processing in a short time even when making a deep hole. It is an object of the present invention to provide a cutter and to provide a drilling device that can perform a drilling operation quickly without inserting a marking line when drilling more than two boxes.

  A cable wiring box drilling device includes: a housing for preventing and positioning chips from scattering; a body connected to the housing and supported by a hand; and a shaft rotatably supported in the body. A shaft driven by a separate drive device attached to the shaft, a cylindrical hole cutter attached to the tip of the shaft and drilling a hole in the wall plate, and provided in the body, the thickness of the wall plate And a cutting amount adjusting mechanism for adjusting the cutting amount of the hole cutter, and a cable wiring box drilling device comprising a guide arm rotatably supported on the outer periphery of the housing. The mounting position of the guide arm is manually rotated by 90 ° and positioned.

According to the first aspect of the present invention, the guide arm is manually rotated by 90 ° and positioned, so that the guide arm is inserted into the already-processed hole a and the inner surface of the hole a is contacted. in particular Ri good, since it is drilling without having to put a scribe line, become a scribe line at the time of more drilling work for two box is not required, it can be up more and more quickly the efficiency of drilling work such as hole c.

  The invention described in claim 2 is the cable wiring box drilling device according to claim 1, wherein a drilling reference portion, a level and a guide block are provided at the upper end of the housing. And

  According to the invention described in claim 2, by providing the drilling reference portion, the level and the guide block at the upper end of the housing, the marking line for the drilling operation is injured by detecting the position by the search sensor. You can check the drilling position and horizontal direction with just a few holes, so you can drill quickly.

  The invention described in claim 3 is the cable wiring box drilling device according to claim 1, wherein the hole cutter has four flat blades, two outer sharp blades, and two inner sharp blades. The outer acute angle blade and the inner acute angle blade are characterized by having a tip protruding 0.3 to 1.5 mm from the flat blade.

  According to the invention described in claim 3, the number of types of cutting blades of the hole cutter is three, the outer acute angle blades are two, the inner acute angle blades are two, and the flat blades are four, and are alternately arranged. Distributing the load prevents damage to the blade due to the cutting work in a short time, and the outer and inner sharp blades have a tip protruding 0.3 to 1.5 mm from the flat blade. Since the load applied to the corner of the flat blade is reduced, it is possible to provide an efficient hole cutter that performs processing in a short time even when making a deep hole.

According to the first aspect of the present invention, the guide arm is manually rotated by 90 ° and positioned, whereby the guide arm is inserted into the already-processed hole a that has been processed, and abuts against the inner surface of the hole a. Ri by the, since it is drilling without having to put a scribe line, become a scribe line at the time of more drilling work for two box is not required, can be up more and more quickly the efficiency of drilling work such as hole c.

According to the second aspect of the present invention, by providing the drilling reference portion, the level and the guide block at the upper end of the housing, the hole a is formed when the hole b is formed, and the hole c is formed when the hole d is formed. a by inserting the guide block, scribe lines only scribing the point e by the position detection by the search sensor, since the drilling position, the horizontal direction can be confirmed, scribe line is not required, it is quickly drilling operations.

  According to the third aspect of the present invention, there are three types of hole cutters for the hole cutter, two outer sharp blades, two inner sharp blades, and four flat blades arranged alternately and loaded. By preventing the damage of the blade part due to the cutting work in a short time, the outer acute angle blade and the inner acute angle blade have the tip protruded 0.3 to 1.5 mm from the flat blade, Since the load applied to the corner of the flat blade is reduced, it is possible to provide an efficient hole cutter that performs processing in a short time even when making a deep hole.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The cable wiring box drilling device is a drilling device for opening a wall plate and attaching a cable wiring box of an outlet or a switch.
FIG. 1 is a perspective view of a cable wiring box drilling device 10 of the present invention. As shown in FIG. 1, a housing 1 having a flange surface 1a is formed at the tip (left front in the drawing), covers the hole cutter 4 and the center drill 8, and has a depth adjustment ring 5a behind it. The body 2 which is a main body having the grip 18 is connected. A guide arm 7 is rotatably mounted on the outer periphery of the body 2.

2 is a longitudinal sectional view taken along line AA shown in FIG. 3A is a cross-sectional view taken along line BB shown in FIG. 2, FIG. 3B is a right side view of FIG. 1, and FIG. 4 is a left side view of FIG.
As shown in FIG. 2, a cable wiring box drilling device (hereinafter referred to as a drilling device) 10 is connected to the housing 1 for preventing and positioning chips from being scattered, and is supported by a hand (hand). A body 2, a shaft 3 driven by a separate drive device attached to the rear end of the body 2, and a cylindrical hole cutter 4 attached to the tip of the shaft 3 and having a hole in a wall plate The cutting amount adjusting mechanism 5 adjusts the cutting amount of the hole cutter 4 in accordance with the thickness of the wall plate.

The housing 1 is formed of a polycarbonate resin that has a diameter enlarged end, covers the cylindrical hole cutter 4, and is a transparent body and has high impact resistance. A level 11 is stored at the top end of the housing 1, and the left / right inclination, that is, the horizontal direction can be visually confirmed by the position of one bubble of the level 11.
In addition, a guide block 19 serving as a guide for forming a second hole (for example, a hole b in FIG. 7C) is provided in the lower portion of the housing 1 . For example, the guide block 19 is inserted into the inner peripheral surface of the first hole a so that the hole b can be positioned .
The guide block 19 protrudes slidably below the hole cutter 4 where it does not interfere, and is held by a rod 27 via a coil spring 28. Although the guide block 19 is always urged by the coil spring 28, it is not used when the first hole (for example, the hole a in FIG. 7 (c)) is formed, so it resists the urging force of the coil spring 28. If pressed, it is stored in the housing 1.
Guide arm 7, the outer peripheral lower portion of the housing 1 is provided so as to rotate about the housing 1, it is positioned at the position of the engaged thereby by 90 ° rotation in the engaging portion projecting to the outer periphery of the body 2 It can be done.
Further, a bush 16 which is a bearing that is rotatably supported is disposed at the center of the rear end of the housing 1, and the shaft 3 is mounted via a ring 17.
Further, as shown in FIGS. 3A and 3B, a reference portion for alignment serving as a reference for drilling the box is provided at the front end portion of the housing 1, and marks 2, 1, and 2 are provided.

As shown in FIG. 2, the body 2 is fixed to the housing 1 with a set screw, and a cut amount adjusting ring 5 a that is a component of the cut amount adjusting mechanism 5 is incorporated on the outer periphery to adjust the cut amount. A grip 18 is fitted and attached to the outer periphery of the ring 5a.
5A and 5B show the cut amount adjusting ring 5a, FIG. 5A is a plan view, FIG. 5B is a cross-sectional view taken along the line C-C shown in FIG. 5A, and FIG. Further, (d) is a bottom view, and (e) is a development view of the spiral staircase-shaped convex portion.
As shown in FIG. 5B, a spiral step-like convex portion 5c is provided on the inner periphery of the cut amount adjusting ring 5a. A serration 5d is provided on the inner periphery of the rear end of the cut amount adjusting ring 5a. Further, as shown in FIG. 3A, the leaf spring 35 mounted in the groove 2a of the body 2 engages and positions the serration 5d, and the fine cut amount of the cut amount adjusting ring 5a. To ensure the adjustment.
As shown in FIG. 2, a stopper 5 b that is a component of the cutting amount adjusting mechanism 5 is attached to the shaft 3. A protrusion 5e (see FIG. 5 (a)) for preventing slipping when rotating with a hand is provided on the outer periphery in parallel to the axis, so that the body 2 does not rotate with the rotation of the shaft 3. The long groove 2d formed is fitted and prevented from rotating. As shown in FIG. 5E, the engagement state between the spiral stepped convex portion 5c and the stopper 5b is such that the stopper 5b indicated by a two-dot chain line is in contact with the four steps of the spiral stepped convex portion 5c. Adjust the depth of cut in units.

As shown in FIG. 2, the shaft 3 is formed in a pipe shape with an enlarged tip portion, and four elongated holes 3 a and 3 a are opposed to each other at the expanded pipe-shaped rear portion. . Further, the pipe-shaped tip is further expanded in diameter to form a flange 3b, and a cylindrical hole cutter 4 is fixed to the surface of the flange 3b by bolts 33, 33. The end of the center drill 8 is fitted into the hole 3 d formed in the end surface of the hole of the shaft 3 and is fixed by a set screw 22.
Further, a support 13 formed in a pipe shape is inserted into the space between the center drill 8 and the shaft 3, and a supporter 14 is attached to the tip of the support 13. The support 13 is countersunk on the ring 17 and is fixed to the ring 17 with small screws 25 and 25 via a collar 24.
Further, the rear end portion 3c of the shaft 3 is formed in a hexagonal shape and is gripped by a three-claw chuck provided at the front end of the charging driver 40 (see FIG. 7).

  The hole cutter 4 employs 8 blades, 4 of which are flat blades, 2 are outer sharp blades, and the remaining two are inner sharp blades. 6 shows the hole cutter 4, FIG. 6 (a) is a left side view, FIG. 6 (b) is a cross-sectional view, and FIGS. 6 (c) to 6 (j) show the shape and machining shape of each cutting edge. It is an enlarged view shown. In order from FIG. 6 (c), the cutting edge A is arranged in the order of the outer acute blade, the cutting blade C is a flat blade, the cutting blade B is an inner acute blade, the cutting blade C is a flat blade, and so on. Each acute angle blade is formed at about 30 °, and the tip of the acute angle blade protrudes 1.0 mm from the flat blade. For this reason, first, the inner and outer sharp blades cut into the workpiece, and after forming the contour, the remaining central wall plate is scraped off with the flat blade. If the step between each sharp blade and the flat blade is 0.3 mm or less, the sharp blade is not sufficiently bite. If the step between each sharp blade and the flat blade is 1.5 mm or more, the sharp blade is likely to bite into the workpiece. Therefore, the charging driver is easy to lock, and if it is less than this, the blade is loaded with a cut material and takes a long cutting time, so 0.3 to 1.5 mm is preferable. According to the present invention, in the control panel, the drilling time can be shortened to 1/5 to 1/10 as compared with those manufactured by other companies. In addition, since the outer acute angle blades and the inner acute angle blades are alternately arranged, the chips are discharged smoothly, and even if there are eight blades, clogging does not occur.

  The guide arm 7 is pivotally supported on the outer periphery of the housing 1 and is provided at a lower position where it does not interfere with the hole cutter 4. The guide arm 7 is usually fixed by fitting 2c to 7c, but is manually rotated by 90 ° and positioned. As shown in FIG. 1, the guide arm 7 has engaging portions 7a and 7a, and the engaging portion 7a has a recess 7b. Further, the body 2 is formed with an engaging portion 2c. As shown in FIG. 4, when the guide arm 7 is once rotated by 90 °, the guide arm 7 is bent against the urging force of the coil spring 29 and released from 2c to 7c and rotated by 90 ° to engage the engaging portion. Positioning is completed by the urging force of the coil spring 29 by fitting the concave portion 7 b of 7 a into the engaging portion 2 c of the body 2.

  Here, operation | movement and the operation procedure of the drilling apparatus 10 are demonstrated in detail with reference to drawings. FIG. 7A is an explanatory view showing a state in which a charging driver 40 as a driving device is connected to the drilling device 10 and brought close to the wall plate 36, and FIG. 7B is a diagram showing a cable wiring box drilling device 10. FIG. 7 (c) shows a conventional marking line for one piece and the marking and processing holes a and b of this embodiment, and FIG. 7 (d) shows a conventional reference portion for positioning the upper end of the tip. It is explanatory drawing which shows two marking lines, the marking of this embodiment, and process hole a, b, c, d. FIG. 8 is a cross-sectional view showing a state after the hole cutter is pushed in by the thickness of the wall plate.

<Drilling one box>
(1) First, as shown in FIG. 7A, the thickness of the wall plate 36, for example, the thickness of the gypsum board 21 mm is confirmed, and the cutting amount adjusting ring 5a of the cutting amount adjusting mechanism 5 shown in FIG. Is turned and adjusted to a scale of 22 mm, which is 1 mm larger.
(2) As shown in FIG. 7C, for example, the arrangement of the cable wiring box that is the position of the outlet is detected by a search sensor, and a point e is determined by putting a marking line on the wall.
(3) The mark 1 of the alignment reference part at the upper end of the tip of the drilling device 10 is aligned with this point e, the horizontal level is determined by the level 11, the position is determined and pressed against the wall plate 36.
(4) The charging driver 40 is operated to rotate the shaft 3 and the hole cutter 4 connected to the shaft 3 is rotated to start the hole a drilling operation. After the inner sharp edge blade and the outer sharp blade cut into the cut object to form the contour, the remaining center wall plate is scraped off with the flat blade, and the process is completed. The housing 1 is a cover that is formed of a transparent resin and covers the hole cutter 4 and at the same time plays a role of dust prevention of chips generated during cutting, so that the cutting state can be confirmed.
(5) After the drilling is completed, the hole cutter 4 and the center drill 8 are returned into the housing 1 by the biasing force of the coil spring 23 by the coil spring 23. At that time, the chip remaining in the hole cutter 4 is discharged outside by the supporter 14 by the return.
The support 13 and the supporter 14 set at the center of the shaft rotate together with the center drill 8, but do not move in the direction of the exit and remain in a fixed position.
(6) When the drilling of the hole a is completed, the guide block 19 is inserted into the inner peripheral surface of the hole a, and the hole b is similarly drilled while maintaining the level.

<Drilling two boxes>
As shown in FIG. 7D, holes a and b are formed by the above-described procedure, and holes c and d are subsequently formed.
(7) When one hole has been drilled (holes a and b), this time, the guide arm 7 is set at a position of 90 degrees, and the guide arm 7 is brought into contact with the inner surface of the hole a that has been drilled for one hole. Press and level with the level to determine the hole c (see FIG. 4).
(8) When the charging driver 40 is operated to rotate the shaft 3, the hole cutter 4 connected to the shaft 3 is rotated, and the drilling operation of the hole c is started and finished.
(9) Further, similarly to the above (7), the guide arm 7 set at a position of 90 degrees is pressed against the side surface of the hole b made for one piece, and the guide block 19 is inserted into the hole. It is in contact with c and used as a reference for hole d.
(10) The charge driver 40 is operated to rotate the shaft 3, the hole cutter 4 connected to the shaft 3 is rotated, the hole d is formed, and the operation is completed.

In addition, the drilling apparatus 10 comprised in this way has the following effects. For example, since the guide arm 7 is a guide for drilling two or more boxes, it is possible to easily set the device at the drilling position for two without inserting a marking line as in the prior art. Can be omitted.
The present invention can be variously modified and changed within the scope of the technical idea.

It is a perspective view of the drilling device for cable wiring boxes of the present invention. It is a longitudinal cross-sectional view of the AA line shown in FIG. (A) is sectional drawing of the BB line shown in FIG. 2, (b) is a right view of FIG. It is a left view of FIG. The cut amount adjusting ring 5a is shown, (a) is a plan view, (b) is a cross-sectional view taken along the line C-C shown in (a), (c) is a front view, (d) is a bottom view, and (e). FIG. 4 is a development view of a spiral staircase convex portion. A hole cutter is shown, (a) is a left side view, (b) is a cross-sectional view, and (c) to (j) are enlarged views showing the shape and machining shape of each cutting edge. It is explanatory drawing which shows a mode that the rotary tool was connected to the drilling device for cable wiring boxes, and was made to approach a wall board, (b) shows the alignment mark of the front-end | tip top of the drilling device for cable wiring boxes, (c) 1 shows the conventional marking line for one piece and the marking and processing holes a and b of this embodiment, and (d) shows the conventional two marking line and the marking and processing hole a of this embodiment. , B, c, d. It is sectional drawing which shows the state after pushing in a hole cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Body 2a Groove part 2d Long groove 3 Shaft 3a Long hole 3b Flange 3c Rear end part 4 Hole cutter 5 Cutting amount adjustment mechanism 5a Cutting amount adjustment ring 5b Stopper 5c Spiral step-like convex part 5d Serration 5e Convex part 7 Guide arm 8 Center drill 9 Cover 10 Drilling device for cable wiring box (drilling device)
11 Level 12 Packing 13 Support 14 Supporter 16 Bush 17 Ring 18 Grip 19 Guide Block 24 Collar 27 Rod 28 Coil Spring 35 Plate Spring

Claims (3)

A housing (1) for preventing and positioning chips,
A body (2) connected to the housing (1) and supported by a hand;
A shaft (3) that the rotatably journalled in the body (2) is driven by a separately provided driving device mounted on the rear end of the body (2),
A cylindrical hole cutter (4) which is attached to the tip of the shaft (3) and which makes holes (a, b, c, d) in the wall plate (36) ;
A cutting amount adjusting mechanism (5) provided in the body (2) and adjusting a cutting amount of the hole cutter (4) according to the thickness of the wall plate (36) ;
A cable wiring box drilling device (10) comprising :
A guide arm (7) pivotally supported is provided on the outer periphery of the housing (1) , and the mounting position of the guide arm (7) is manually rotated 90 ° to be positioned. Drilling device for cable wiring box (10) . The cable wiring box drilling device (10) according to claim 1, wherein a drilling reference portion, a level (11), and a guide block (19) are provided at an upper end of the housing (1 ). . The hole cutter (40) is a flat blade (C) is four, two outer sharp edge (A) is, and the inner acute angle edge (B) is composed of eight two, outer sharp edge (A 2) and the inner acute angle blade (B), the tip portion of the acute angle protrudes 0.3 to 1.5 mm from the flat blade, The cable wiring box drilling device (10) according to claim 1, wherein

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