JP4802146B2 - Magnet drill - Google Patents

Description

  The present invention relates to a drill for performing drilling or the like on an object to be drilled, and more particularly to a magnet drill for performing drilling or the like by fixing a drill to a magnetic body that is an object to be drilled using a magnet.

  FIG. 8 is a side view schematically showing a conventional magnet drill (magnetic drilling machine). The magnet drill 100 mainly includes a drill stand 104 having a magnet 102 and an electric drill 106 attached to the drill stand. The magnet is used to fix the magnet drill to the drilling object by being magnetically attached to the drilling object 16 that is a magnetic material.

  The drill stand 104 is provided with an elevating function for elevating and lowering the attached electric drill 106 in the axial direction of the bit 12 by operating the elevating handle 108. A magnet 102 provided in the drill stand 104 is an electromagnet that generates a magnetic force when energized, and is housed in a casing 112 having a bottom surface as a magnetic material. The bottom surface of the casing 112 is a plane whose normal direction is the axial direction of the bit. The lifting function of the drill stand 104 is that of the bit 12 attached to the electric drill between the upper side and the lower side of the extended surface of the casing bottom surface. The electric drill 106 is moved up and down so that the tip can reciprocate.

As an invention related to a magnet drill, for example, the “centering mechanism of a magnetic drilling machine” disclosed in Patent Document 1 has been proposed.
JP 2002-454227 A

  When drilling an object to be drilled with such a conventional magnetic drill, before the actual drilling, the lifting handle of the drill stand is turned and the electric drill is pushed down, and the tip of the bit is attached to the drilling part of the drilling object. Centering work was performed to bring the hole to be drilled into alignment with the axis of the bit by bringing it close to the marking or the like.

  Here, when the object to be drilled is a long object having a rectangular cross section attached to a wall surface, ceiling, or the like in order to store a pipe or the like, a plurality of holes may be drilled at a predetermined interval in the longitudinal direction. . In the conventional magnet drill, even in such a case, it is necessary to perform drilling after performing the above-described center determination operation while supporting the magnet drill, and therefore the work efficiency is poor. In addition, when drilling a plurality of holes in the longitudinal direction of a long object, it is important that the plurality of holes are aligned, but the interval between adjacent holes is often not so precise.

  The magnet of the drill stand is very useful as a means to fix the electric drill to the drilling object, but in the above-mentioned centering operation, the position of the marking attached to the drilling location and the axis of the bit However, there is a problem that it is extremely difficult to re-center the magnet drill to the correct position in the magnetized state. For example, this has caused an increased work load when the object to be drilled is arranged on the ceiling surface or the like and must be drilled from below. In other words, if the magnet drill can be magnetically attached to the drilled object, the operator can easily work by gently supporting the magnet drill from below, but if the marking position and the axis of the bit are misaligned, the magnet It is necessary to stop the energization and re-center the bit to the correct position while firmly supporting the magnet drill from below, and such work must be performed while supporting the weight of the magnet drill. There was a problem that it was difficult because there was. Further, when the energization of the magnet is stopped, the weight of the magnet drill is abruptly added to the hand of the operator supporting the magnet drill, so that there is a possibility of dropping it.

  When deciding on the center of the magnetic drill, the amount of force is delicate, and the magnet drill often moves against the will of the operator due to friction between the bottom of the drill stand and the drilling surface. It was often difficult to determine the center.

  The present invention has been made to solve such problems. That is, an object of the present invention is to achieve an improvement in work efficiency by facilitating a centering operation when a plurality of holes are perforated in a long object. Another object of the present invention is to provide a magnet drill that can be easily re-centered to the correct position when the center of the magnet drill is misaligned.

  In order to achieve the above object, the present invention provides an electric drill (14) to which a bit (12) is attached at the tip, holds the electric drill so as to be movable up and down in the axial direction of the bit, and applies a magnetic force by energization. A drill stand (22) having a magnet (18) for generating and magnetically attaching to a drilling object (16), which is a magnetic body, and a bottom surface of the drill stand (10) 22a) is made of a magnetic material and is in contact with the magnet with the axial direction of the bit as a normal direction, and a part or all of the peripheral edge of the bottom surface of the drill stand is centered on the axial center of the bit. There is provided a magnet drill characterized by being formed in an arc shape.

  A plurality of concave holes (24) are formed in the drill stand bottom surface (22a), and each concave hole is supported by an elastic body (26) provided at the bottom of the concave hole, and a part thereof is a drill stand. A roller (28) is attached so as to protrude from the bottom surface, and the magnetic force of the magnet (18) is such that only the roller is magnetically attached to the drilling object (16) and the elastic body is deformed. It is preferable that the roller can be stepwise switched to a strength at which the entire bottom surface of the drill stand is magnetically attached to the drilling target by pushing the roller into the concave hole.

  Here, in particular, the magnetic force of the magnet (18) is applied when the compressive force due to the weight of the magnet drill (10) acts on the bottom surface (22a) of the drill stand and when the tensile force due to the weight of the magnet drill acts on the bottom surface of the drill stand. In this case, it is possible to switch between the state in which only the roller (28) is magnetically attached to the drilling object (16) and the state in which the entire bottom surface of the drill stand is magnetically attached to the drilling object. preferable.

  The roller (28) is a sphere.

  It is also preferable that a light source (32) for emitting one slit-like light beam is provided in a plane including the axis of the bit (12).

  In the magnet drill of the present invention, the bottom surface of the drill stand to which the magnet is attached has the axis direction of the bit as the normal direction, and part or all of the peripheral edge of the drill stand bottom surface is centered on the bit axis. Since the drill stand bottom edge is applied to the side of a straight bar that is temporarily fixed on the drilling surface of the drilling object, the drill stand is slightly moved within the drilling surface. Even if the work is performed in an inclined state, a plurality of holes can be easily drilled along the bar square while keeping the distance from the bar square (a length of the radius) constant. As described above, when a plurality of holes are drilled in the longitudinal direction of a long object, it is important that the plurality of holes are aligned, but the interval between adjacent holes is not so strict. In many cases, if the magnetic drill of the present invention is used, the center of the magnetic drill can be determined very easily, and the working efficiency is also greatly improved.

  Also, a plurality of concave holes formed on the bottom surface of the drill stand are supported by an elastic body arranged at the bottom of the concave hole, and a roller is provided so that a part of the concave portion protrudes from the bottom surface of the drill stand. Centering is possible by switching the magnetic force stepwise between the strength that only the roller is magnetically attached to the drilling object and the strength that the entire bottom of the drill stand is magnetically attached to the drilling object by deforming the elastic body. Even if the position of the magnetic drill that is magnetically attached is shifted from the drilling position, it is possible to easily re-center it to the correct position by setting only the roller to be magnetically attached. And work safety can be increased.

  Here, when working with the magnet drill placed on the drilling object (when the compression force due to the weight of the magnet drill is acting on the bottom of the drill stand) and when hanging on the drilling object (When the tensile force due to the weight of the magnet drill is acting on the bottom of the drill stand), the magnetic force of the magnet is magnetically attached to the drilling object and the bottom of the drill stand in each case. It is possible to switch between the state in which the whole is magnetically attached to the drilling object, so that only the roller is magnetically attached to the drilling object during the centering operation, and after the centering is confirmed, the entire bottom surface of the drill stand is A drilling operation can be performed by magnetizing the object to be drilled. This makes it possible to improve the stability and workability during centering work. In particular, it reduces the burden on the operator when drilling an object to be drilled from below (and from the side), and also increases safety. Can be improved.

  If the roller is a sphere, the magnet drill can be easily moved in all directions within the drilling surface in the centering operation, which is convenient. If a plurality of rollers are arranged in parallel, a plurality of perforations can be simply performed in a straight line.

  In addition, if a light source that emits one slit-like light beam is provided on the drill stand of the magnet drill in the plane including the axis of the bit, centering can be performed only by this optical axis. That is, since the distance from the peripheral edge of the drill stand bottom surface to the bit axis is constant, the bit axis and the point where the optical axis direction and the peripheral edge of the drill stand bottom surface are in contact with the drilling object (or the bar material temporarily fixed thereon) As long as the direction connecting the hearts does not match, centering can be completed only by adjusting the optical axis to the drilling position.

  The present invention is, for example, a magnet drill that is attached to a wall surface, a ceiling, etc., and is useful for drilling a plurality of holes in a longitudinal direction at a predetermined interval in a long object having a rectangular cross section in which piping or the like is housed. In particular, the centering operation of the drilling position is facilitated. Hereinafter, the structure of the magnet drill of the present invention will be described with reference to the drawings, and the usage method will be briefly described.

FIGS. 1 to 3 are views for explaining the configuration of the magnet drill of the first embodiment, FIG. 1 is a side view showing the case cover through, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 and FIG. 3 are bottom views.
This magnet drill 10 is a handy type device having an overall weight of about 3.5 kg. As shown in each figure, an electric drill 14 having a bit 12 (drilling blade) attached to the tip and an electric drill 14 are provided. A drill stand 22 is provided that includes a magnet 18 that is held up and down in the axial direction of the bit 12 and that generates a magnetic force when energized and is magnetically attached to the drilling target 16. The magnet drill 10 is covered with a casing cover 33 indicated by a broken line except for the portion near the axis of the bit 12.

The drill stand 22 has a size of about 15 cm × 10 cm × 12 cm in length × width × height, and there are a plurality of top plates 35 constituting the top surface of the magnet drill 10 and bottom plates 37 constituting the bottom surface of the magnet drill. The structure is connected by a column 39.
The top plate 35 has a shape in which four corners of a rectangular metal plate are cut out in an arc shape, and at least one end of the tip side is centered on the axis of the bit 12 of the electric drill 14 to be attached to the lower side. In the form of a circular arc (arc of radius W in the drawing).
On the other hand, the bottom plate 37 is formed of a magnetic material, and the tip side of the bottom plate 37 has an arc shape (arc of radius W in the drawing) centered on the axis of the bit so that the bit 12 can pass therethrough A semicircular window 41 is open.

A magnet 18 (electromagnet) that generates a magnetic force when energized is attached to the bottom plate 37, and this magnet 18 is connected to a power source by operating a magnetic force switch 43 provided on the drill stand 22. The control of the control device 20 can switch the strength, weakness, and off of the magnetic force.
The strength of the magnetic force is such that the magnetic drill 10 is firmly attached to the drilling object 16 and the drill is not displaced during the drilling operation, and the drilling surface of the drilling object 16 is not limited to the ceiling surface. Even in the case of a vertical surface, the strength is such that the magnetized magnet drill 10 does not fall. Here, it is also preferable that the strength of the magnetic force can be adjusted steplessly (or in multiple steps) corresponding to the time of pressing the magnetic force switch 43, for example.

  Further, the drill stand 22 is provided with an elevating mechanism for elevating an electric drill 14 described later in the axial direction of the bit 12 attached to the electric drill. This lifting mechanism has a feed motor 47 that lifts and lowers the electric drill 14 under the control of the control device 20 connected to a power source by operating a lifting switch 45 provided on the drill stand 22. Of course, instead of the feed motor 47, it is possible to provide a lifting handle like a conventional magnet drill.

  The electric drill 14 has a structure in which the power of the main shaft motor 49 rotates the drill rotating shaft 51 to which the bit 12 is attached via a reduction gear 50 configured by combining gears. The spindle motor 49 can be switched between forward rotation, reverse rotation, and stop by the operation of the rotary switch 53 provided on the drill stand 22 by the control of the control device 20 connected to the power source.

  In addition, in order to improve the operativity, the magnetic force switch 43, the raising / lowering switch 45, and the rotation switch 53 are side surfaces of the magnet drill housing cover 33 where the fingertip is positioned when the operator grasps the magnetic drill 10 to work. Is arranged.

The magnet drill 10 of Example 1 demonstrated above is used as follows.
In the case of drilling a plurality of holes in a longitudinal row of a long object having a rectangular cross section, first, straight on the perforation surface of the long object (drilling object 16) so as to be parallel to a plurality of planned drilling locations. Temporarily fix a square bar. At that time, the distance between the straight line connecting the planned drilling points and the bar is made the same as the radius (W) of the arc at the tip of the magnet drill.

When a hole is to be drilled in the drilling object 16, the bit 12 is slid so as to be directly above the drilling position by visual inspection while the arc-shaped portion of the tip of the magnet drill 10 is applied to the side surface of the bar. In this state, the magnetic drill 10 is magnetically attached to the drilling object 16 with a weak magnetic force by operating the magnetic force changeover switch. Then, by operating the lift switch 45 to push down the tip of the bit 12 attached to the electric drill 14 to the vicinity of the drilling position, it is confirmed whether the centering is correctly performed. If the center is not correctly determined, the electric drill 14 is once lifted, the magnet drill 10 is shifted while the tip is applied to the side of the bar, and the lift switch 45 is operated again to determine the center correctly. Make sure that
After confirming that the centering is correct, the magnetic switch 10 is operated so that the magnet drill 10 is firmly attached to the drilling object 16 with a strong magnetic force, and then the rotary switch 53 is operated to rotate the bit 12 forward. Then, the drilling object 16 is drilled by operating the lift switch 45 to push down the electric drill 14. A plurality of perforations are performed by repeating the above procedure.

  According to the magnet drill 10 of the present embodiment described above, the tip of the magnet drill 10 is formed in an arc shape. A plurality of holes can be drilled along the bar rod while keeping the distance of (a length of the radius) constant. When the interval between adjacent holes is not so strict, the centering operation by visual inspection is substantially unnecessary, and the work efficiency is remarkably improved.

4 to 6 are diagrams for explaining the configuration of the magnet drill according to the second embodiment. FIG. 4 is a side view showing the case cover through, FIG. 5 is a bottom view, and FIG. It is BB sectional drawing (only a magnet drill lower part).
The basic configuration of the magnet drill 10 is the same as that of the magnet drill 10 of the first embodiment, except that a magnetic roller 28 having a slightly protruding tip is attached to the drill stand bottom surface 22a. Therefore, in the following description, the same components as those of the magnet drill of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The roller 28 is a sphere, and is accommodated in the plurality of recessed holes 24 formed in the drill stand bottom surface 22 a so as not to fall out of the recessed holes 24. Here, the roller 28 is held in the recessed hole 24 in a state of being pushed out by an urging force by an elastic body 26 (spring, rubber, etc.) provided at the bottom of the recessed hole 24. In order to reduce the rolling resistance between the elastic body 26 and the roller 28, a metal piece or the like may be sandwiched between the elastic body 26 and the roller 28.

The magnetic force of the magnet 18 is such that only the tip of the protruding roller 28 is magnetically attached to the drilled object 16 and the elastic body 26 is crushed to push the roller 28 into the recessed hole 24 so that the entire drill stand bottom surface 22a is drilled. It is possible to switch (strong / weak / cut) to the strength of magnetic attachment to the object 16. More specifically, the magnetic force of the magnet 18 is determined when the drilling object 16 is drilled from the upper side (the magnet drill is placed on the drilling object), when drilling from the lateral side, or when drilling from the lower side (magnet). The drill is designed to be able to switch the magnetic force according to its use state in consideration of the fact that the drill hangs from the side surface or the lower surface of the drilling object.
As described in the first embodiment, the switching of the magnetic force may be adjustable in accordance with the pressing time of the magnetic switching switch. For example, the use state of the magnet drill 10 is detected by a pendulum sensor or the like. The magnetic drill is adjusted to the optimum strength when drilling from the upper side, drilling from the side, and drilling from the lower side. It is also preferable to be able to perform only by the switching operation (strong / weak / off) of the magnetic force switch 43 without being aware of the state. It is assumed that the weak magnetic force is set so that the magnetized magnet drill 10 does not fall off even when the drilling target 16 is drilled from the side or from below.

  According to the magnet drill of the present embodiment, in addition to the effect of the magnet drill of the first embodiment, it is possible to easily perform the center determination work. Especially in the centering work, even if the position of the weakly magnetized magnet drill is shifted from the drilling position, it is possible to easily re-center it to the correct position in the magnetized state. And work safety can be increased.

FIG. 7 is a perspective view for explaining the characteristics of the magnet drill according to the third embodiment, and shows the tip of the magnet drill. In addition, since the basic structure of the magnet drill of a present Example is the same as that of the magnet drill of Example 2, drawing of the whole image is abbreviate | omitted.
The magnet drill 10 is provided with a light source 32 for easy centering.

  The light source 32 is a laser that emits one slit-shaped light beam, and this laser is attached to one side of the magnet drill 10 and is attached to the electric drill 14 in a direction perpendicular to the longitudinal direction of the magnet drill. In addition, the laser beam is irradiated in a plane including the axis of the bit 12. Although a laser pointer can be used as the light source 32, in this case, it is necessary to attach the laser so that the optical axis of the laser passes through a point where the same surface of the bottom surface of the magnet drill and the bit axis are perpendicular to each other.

  According to the magnet drill 10 of the third embodiment described above, the distance from the bar square can be kept constant by applying the tip of the magnet drill to the bar square, and the slit-like laser beam is used as the magnet drill. By irradiating the surface perpendicular to the longitudinal direction and the plane including the axis of the bit 12 attached to the electric drill 14, the position in the direction along the bar can be easily confirmed. Therefore, centering can be correctly performed only by visual observation of the laser beam without bringing the bit tip close to the drilling target 16.

  As described above, the magnetic drill of the present invention facilitates the centering operation when performing a plurality of drillings in a row on a long object or the like. It is possible to easily re-center to the correct position.

  It should be noted that the configuration of the present invention is not limited to that described above, and can be appropriately changed without departing from the spirit of the invention. For example, the shape of the magnet drill (the shape of the top plate and the bottom plate) may be a front-rear circular shape or a circular shape.

It is a side view for demonstrating the structure of the magnet drill of Example 1. FIG. It is an AA cross-sectional arrow view of FIG. It is a bottom view of the magnet drill of Example 1. It is a side view for demonstrating the structure of the magnet drill of Example 2. FIG. It is a bottom view of the magnet drill of Example 2. It is BB sectional drawing (only a magnet drill lower part) of FIG. It is a perspective view showing the tip part of the magnet drill of Example 3. It is a side view showing the outline of the conventional magnet drill (magnetic drilling machine).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnet drill 12 Bit 14 Electric drill 16 Drilling object 18 Magnet 20 Control apparatus 22 Drill stand 22a Drill stand bottom surface 24 Recessed hole 26 Elastic body 28 Roller 32 Light source 33 Case cover 35 Top plate 37 Bottom plate 39 Support | pillar 41 Window part 43 Magnetic force Changeover switch 45 Elevating switch 47 Feed motor 49 Spindle motor 50 Reducer 51 Drill rotating shaft 53 Rotating switch 100 Magnet drill 102 Magnet 104 Drill stand 106 Electric drill 108 Lifting handle 112 Casing

Claims (5)

An electric drill (14) to which a bit (12) is attached at the tip, and a drilling object which is a magnetic body by generating a magnetic force by energizing the electric drill while holding the electric drill up and down in the axial direction of the bit A drill stand (22) having a magnet (18) for magnetic attachment to (16), and a magnet drill (10),
The bottom surface (22a) of the drill stand is made of a magnetic material and is in contact with the magnet with the axial direction of the bit as a normal direction, and a part or all of the periphery of the bottom surface of the drill stand is the bit. A magnet drill, characterized in that it is formed in an arc shape centered on the axis. A plurality of concave holes (24) are formed in the drill stand bottom surface (22a),
Each concave hole is supported by an elastic body (26) provided at the bottom of the concave hole, and a roller (28) is attached so that a part thereof protrudes from the bottom of the drill stand,
The magnetic force of the magnet (18) is such that only the roller is magnetically attached to the drilling object (16) and the elastic body is deformed so that the roller is pushed into the recessed hole and the entire bottom surface of the drill stand is used as the drilling object. The magnet drill according to claim 1, wherein the magnet drill can be switched step by step to the strength to be magnetized.   The magnetic force of the magnet (18) is when the compressive force due to the weight of the magnet drill (10) acts on the bottom surface (22a) of the drill stand and when the tensile force due to the weight of the magnet drill acts on the bottom surface of the drill stand. Furthermore, it is possible to switch between a state in which only the roller (28) is magnetically attached to the drilling object (16) and a state in which the entire bottom surface of the drill stand is magnetically attached to the drilling object. Item 3. A magnetic drill according to item 2.   The magnet drill according to claim 2 or 3, wherein the roller (28) is a sphere.   5. The light source according to claim 1, wherein a light source that emits one slit-like light beam is provided in a plane including the axis of the bit. Magnet drill.

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