Auxiliary implement for drilling work

Abstract

To provide an auxiliary implement for drilling work that enables the drilling work to be performed with stable quality even by a single worker.SOLUTION: An auxiliary implement 1 in an embodiment is to be attached to a drilling tool 5 and includes: a level vial 6; and an irradiator 13 that irradiates a laser beam toward a target position that is set at a position different from an actual drilling position on a construction surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an auxiliary device for drilling work that is attached to a drilling tool and used. [Background technology]

[0002] Conventionally, when drilling work is performed by one person, it has been difficult to drill properly because the drilling position has to be viewed from an angle. For this reason, for example, Patent Document 1 describes a method that enables drilling perpendicular to the construction surface by measuring the inclination of the drilling tool relative to the construction surface without using a level. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-229888 Summary of the Invention [Problem to be solved by the invention]

[0004] However, depending on the location of the drilling work, it is necessary to drill vertically along the vertical direction rather than perpendicular to the construction surface. Also, in order to stabilize the quality of the drilling work, it is required to be able to work while maintaining the drilling tool in an appropriate position even when viewing the drilling position at an angle.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and its purpose is to provide an auxiliary tool for drilling work that allows drilling work to be performed with stable quality even by a single worker. [Means for solving the problem]

[0006] The auxiliary device for drilling work in this embodiment is attached to a drilling tool and includes a spirit level and an irradiator that irradiates laser light toward a target position set at a position different from the actual drilling position on the construction surface. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an assistive device according to an embodiment. [Figure 2] FIG. 10 is a diagram showing a schematic view of an attachment mode of an auxiliary device; [Figure 3] A diagram showing an example of the shape of a marker made by a cross-line laser. [Figure 4] Diagram 1 explaining the operation of the auxiliary equipment while comparing it with the drilling operation [Figure 5] Diagram 2 explaining the operation of the auxiliary equipment while comparing it with the drilling operation [Figure 6] A diagram explaining the steps to prepare the assistive device [Figure 7] Schematic diagram of drilling operation [Figure 8] FIG. 10 is a diagram showing a comparison between the posture of the drilling tool and the visibility of the marker; [Figure 9] 10A and 10B are diagrams schematically showing other examples of the shape of the marker; [Figure 10] A diagram showing a schematic configuration example of a dripping section DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment will be described with reference to the drawings. As shown in Fig. 1 as a top perspective view and a bottom perspective view, an auxiliary tool 1 of this embodiment includes a housing 2, an alternative handle 3, and an attachment part 4, and is attached to a drilling tool 5 for use as shown in Fig. 2. Note that this embodiment is intended to perform drilling work on a concrete construction surface, but the construction surface is not limited to concrete. Furthermore, while an impact drill or a hammer drill is assumed as the drilling tool 5, the type of tool is not limited.

[0009] Hereinafter, directions as seen by the worker are defined as up-down, front-back, and left-right. The actual location on the construction surface (CS) where drilling is performed is referred to as the drilling position (P0), and a target position during work that is set at a position different from the drilling position (P0) is referred to as the target position (P1). The procedure for setting the target position (P1) will be described later. Among the information written on the construction surface (CS) with, for example, ink or oil-based marker, a cross-shaped mark indicating the drilling position (P0) is referred to as the drilling mark (M0), a circular mark indicating the target position (P1) is referred to as the target mark (M1), and an optical mark formed by the laser light irradiated onto the construction surface from the auxiliary tool 1 is referred to as the marker (M2).

[0010] 1, the housing 2 of the auxiliary tool 1 is formed in a roughly rectangular parallelepiped shape, and is provided with a level 6, an LED light 7, multiple buttons 8, and a display 9 on the top surface that is visible to the operator during drilling work. In this embodiment, the housing 2 has a waterproof structure equivalent to IPX6. In this embodiment, the level 6 is a so-called round level, and the tilt in the front, back, left and right directions can be confirmed by an air bubble sealed in a circular container.

[0011] The LED light 7 is located on the rear side of the level 6 and illuminates the level 6. It also flashes or lights up when the operating state of the auxiliary tool 1 changes or when a predetermined condition is met during drilling, as will be described later. This LED light 7 constitutes an alarm unit. The LED light 7 can also be configured to change color, for example, red or green, depending on the operating state or the content of the alarm.

[0012] The plurality of buttons 8 are, for example, a power button, a display switch button for switching the display, a change button for changing numerical values ​​etc., a decision button for inputting a decision operation, etc. Note that the number, type, and arrangement of the buttons 8 are merely examples and are not limited to these. The display 9 is configured with, for example, a liquid crystal panel, and presents various information to the operator. Note that the display 9 may also be configured with a touch panel that doubles as the button 8.

[0013] The housing 2 accommodates a circuit board 10, a buzzer 11, a measuring instrument 12, an irradiator 13, etc. The circuit board 10 is equipped with a control unit 14 made up of a microcomputer for controlling the display 9, etc., a storage unit 15 made up of a semiconductor memory for storing various data and programs, a communication unit 16 for communicating various data with external devices, etc.

[0014] The communication unit 16 corresponds to an output unit, and is configured with a wired or wireless communication means provided in a general personal computer, tablet, smartphone, etc. The type of communication method is not limited, but for example, by adopting USB, it becomes possible to communicate with an external device.

[0015] The buzzer 11 is disposed, for example, on the rear side of the top surface of the housing 2, and sounds in response to an operation by an operator or when a predetermined condition is met during drilling work, as will be described later. This buzzer 11 constitutes an alarm unit. Note that the buzzer 11 can also be configured to output different sounds depending on the content of the alarm.

[0016] The measuring instrument 12 is configured as a so-called laser distance meter that measures distance by irradiating the construction surface with a laser beam. Note that the measuring instrument 12 and the irradiator 13 described later may be integrated into one unit.

[0017] The irradiator 13 emits a cross-line laser beam containing two intersecting line segments. Therefore, an irradiation port 17 having a cross-shaped slit, as shown in FIG. 3 as an example of its shape, is provided on the underside of the housing 2, which faces the work surface during drilling. When the cross-line laser beam is emitted, the laser beam passes through the cross-shaped slit and is irradiated onto the work surface. As shown in FIG. 3 as an example of a mark, a mark (M2) containing a first line segment (M2x) and a second line segment (M2y) perpendicular to the first line segment (M2x) becomes visible on the work surface. As will be described later, during drilling, the operator must check whether the center of the mark (M2) is aligned with the target mark (M1). The irradiation port 17 is also used for irradiating the laser beam from the measuring instrument 12.

[0018] The alternative handle 3 replaces the existing handle 5a (see Figure 6) provided on the drilling tool 5, and is a part on which the operator places his or her hand during drilling work. The attachment part 4 is composed of an annular band 4a and a screw 4b that fastens the band 4a, and is fixed to the drilling tool 5 by wrapping the band 4a around the outer surface of the drilling tool 5 and tightening the screw. Therefore, by attaching the auxiliary device 1, the drilling tool 5 can be supported with both hands, and the posture of the drilling tool 5 can be kept stable during drilling work. Note that the configuration of the attachment part 4 is one example, and other shapes and attachment modes can also be used.

[0019] In addition, in this embodiment, the drilling tool 5 is assumed to have a handle 5a that is arranged perpendicular to the rotation axis (J0) and is mainly used for support, and a main handle 5b that is provided in a position that makes it easy to apply force in the direction of the rotation axis (J0) of the drill 5c, and is operated by an operator with both hands, but it can also be used by attaching the alternative handle 3 to a type that an operator can operate with one hand. In addition, a battery 19 is stored in a battery box 18 provided on the underside of the housing 2.

[0020] Next, the operation and effect of the assistive device 1 having the above-described configuration will be described. In drilling work, it is sometimes necessary to drill holes that are not perpendicular to the construction surface, but that are vertical in the vertical direction. This is because, for example, when drilling holes in a construction surface such as concrete, it is expected that the holes will be drilled to install anchors that will secure a frame that supports a heavy object such as a distribution board. In order to drill vertical holes, it is considered to use a spirit level 6. If the construction surface is slightly inclined, it can be adjusted to be level by laying a so-called liner.

[0021] However, even if the drilling position is confirmed to be vertical at the start of the drilling work, it may be difficult to maintain that state during the drilling work. Also, since the drilling tool 5 vibrates, it may be difficult to confirm the vertical position with the level 6. Furthermore, since the drilling position is viewed at an angle during the drilling work, the quality of the drilling work varies depending on the worker when working while checking visually, making it difficult to provide consistent quality.

[0022] Therefore, in this embodiment, by using the auxiliary tool 1, it is possible to perform work while grasping the posture of the drilling tool 5 even when the drilling tool 5 vibrates or the drilling position is viewed obliquely, thereby making it possible to perform drilling work with stable quality. Below, with reference to Figures 4 and 5, the drilling work by the worker and the operation of the auxiliary tool 1 will be described in comparison.

[0023] As shown in Fig. 4, when starting a drilling operation, the worker first prepares the auxiliary tool 1 (S1). At this time, the worker removes the existing handle 5a that has been attached to the drilling tool 5 in advance, as shown in Fig. 6 as a removal mode, and then attaches the auxiliary tool 1 to the drilling tool 5 by inserting and fixing the main body of the drilling tool 5 into the band 4a of the attachment part 4, as shown in Fig. 6 as an attachment mode.

[0024] The operator also checks whether the rotation axis (J0) of the drill 5c of the drilling tool 5 and the optical axis (J1) at the center of the marker (M2) are parallel. If the rotation axis (J0) and the optical axis (J1) are not parallel, the operator rotates the housing 2 along the central axis (J2). That is, the operator adjusts the direction of irradiation of the cross line laser. At this time, as shown in the example configuration, an adjustment unit 20 is provided between the housing 2 and the alternative handle 3 to enable relative rotation about the central axis (J2) and to fix the housing 2 and the alternative handle 3 at a predetermined rotational position. This adjustment unit 20 can be simply configured, for example, by a cylindrical portion 20a into which the alternative handle 3 is inserted and a fixing screw 20b that penetrates the cylindrical portion 20a and abuts against the alternative handle 3.

[0025] The direction in which the cross line laser is irradiated can be adjusted by changing and fixing the rotational position using the adjustment unit 20. Note that the structure of the adjustment unit 20 is one example, and other structures can also be adopted. Although it is not necessary to remove the auxiliary tool 1 after each drilling operation, it is desirable to check that the rotation axis (J0) and optical axis (J1) of the drill 5c are parallel when performing the next drilling operation.

[0026] Next, the worker checks the target drilling length (D) in the construction guidelines or work instructions (S2). This target drilling length (D) is the depth of the hole to be drilled at the drilling position (P0) as shown in Figure 2. After checking the target drilling length (D), the worker turns on the power to the auxiliary tool 1 (S3). Then, when the power is turned on, the auxiliary tool 1 executes a program and starts operations such as displaying information on the display 9 and accepting operations from the buttons 8 (T1).

[0027] When the auxiliary tool 1 starts operating, the worker sets the target drilling length (D) in the auxiliary tool 1, for example, by operating the change button to input a numerical value and pressing the decision button (S3), and the auxiliary tool 1 stores the set target drilling length (D) in the memory unit 15 (T2). Next, the worker aligns the tip of the drill 5c with the drilling position (P0) as shown in Figure 2, and while checking the level 6, turns on the marker (M2) with the drilling tool 5 positioned vertically. In this step S5, the worker inputs an operation to start irradiating the work surface with laser light, for example.

[0028] In response to this operation, the auxiliary tool 1 starts emitting a cross-line laser (T3) and starts measuring the distance (T4). The auxiliary tool 1 can also be configured to automatically start emitting laser light and measuring the distance when the power is turned on. Furthermore, the irradiation of laser light and the measurement of the distance continue until the task is completed.

[0029] When the marker (M2) is projected onto the work surface, the worker marks a target mark (M1) (S6) at the center of the marker (M2), i.e., the intersection of the first line segment (M2x) and the second line segment, which will serve as a guide for the drilling operation. Unlike the drilling mark (M0), whose position is determined before construction, this target mark (M1) is marked each time the drilling operation begins. Therefore, the worker can arbitrarily and appropriately select the position that is most convenient for the worker. In this case, the worker holding the drilling tool 5 can mark the target mark (M1) himself, or another worker can mark it. However, as explained below, the drilling operation itself can be performed by a single worker.

[0030] After marking the target mark (M1), the worker measures the current distance to the work surface by, for example, pressing the enter button (T6). Then, the auxiliary tool 1 stores the distance to the work surface when the drilling work starts, as shown in Figure 2, that is, the distance to the work surface when the drilling tool 5 is in an appropriate position and vertical, as the start distance (A) at the start of the work (T5). At this time, the auxiliary tool 1 counts each time the start distance (A) is stored, and also stores which drilling position the start distance (A) is for.

[0031] The worker then performs the drilling operation while checking whether the marker (M2) is aligned with the target marker (M1) (S9). At this time, it is expected that a situation such as that shown in Fig. 8 will occur during the drilling operation. Fig. 8 is a diagram that schematically shows the drilling tool 5 as seen by the worker, and also schematically shows the positional relationship between the marker (M2) and the target mark (M1).

[0032] As shown in FIG. 8 as a vertical state, when drilling is performed with the drilling tool 5 in the appropriate vertical position, the center of the marker (M2) is aligned with the target mark (M1). As shown in FIG. 8 as a misaligned state, if the position of the drilling tool 5 is misaligned immediately after the start of drilling, the marker (M2) will be misaligned with the target mark (M1). Therefore, by visually checking the marker (M2), the operator can determine the misalignment of the drilling tool 5 based on the positional relationship between the marker (M2) and the target mark (M1), and can correct the position to perform drilling at the appropriate drilling position (P0). The operator can also perform drilling while checking the level 6 as needed.

[0033] 8 shows a situation in which the drilling tool 5 tilts, for example, to the right as seen by the operator during drilling work. In this case, the drilling tool 5 is assumed to tilt around the drilling position (P0) with the tip of the drill 5c inserted into the hole, that is, with the tip of the drill 5c roughly aligned with the drilling position (P0). In this case, the auxiliary tool 1 also tilts around the drilling position (P0) together with the drill 5c, so the center of the marker (M2) roughly coincides with the target mark (M1).

[0034] However, because the marker (M2) is projected at an angle relative to the construction surface, the length of the first line segment (M2x) to the left of the second line segment (M2y) is longer than the length of the first line segment (M2y) to the right. In other words, the marker (M2) is distorted as if it is extending to the left. Therefore, by visually checking the marker (M2), the worker can grasp the inclination of the drilling tool 5 based on the distortion of the marker (M2), and can correct the inclination and perform drilling work in a vertical state.

[0035] Furthermore, as shown in FIG. 8 as a forward tilt state, a situation is anticipated in which the drilling tool 5 tilts toward the operator during drilling operations. In this case, if the drilling tool 5 tilts around the drilling position (P0), the marker (M2) is projected at an angle relative to the work surface, and therefore the length of the second line segment (M2y) on the front side of the first line segment (M2y) is longer than the length of the second line segment (M2x) on the rear side. In other words, the marker (M2) is distorted as if it is extending forward. Therefore, by visually checking the marker (M2), the operator can grasp the tilt of the drilling tool 5 based on the distortion of the marker (M2), and can correct the tilt and perform drilling operations in a vertical state.

[0036] Also, although not shown in the figure, if the drilling tool 5 is tilted in another direction, the marker (M2) will be distorted in the opposite direction to the tilt direction. Therefore, by visually checking the marker (M2), the worker can grasp the posture of the drilling tool 5 based on the distortion of the marker (M2), and can correct it to the appropriate posture.

[0037] It is considered that the worker's viewpoint during drilling work is generally located above and slightly behind the drilling tool 5. In this case, even if the worker were to look at the marker (M2) at an angle, it is considered that there would be no significant difference in how the marker (M2) appears. This is because the laser light is irradiated at an angle to the work surface as the drilling tool 5 is tilted, and therefore it is considered that there would be a difference in the length of each line segment that would be noticeable to the naked eye. In other words, the auxiliary tool 1 makes it possible to grasp the posture of the drilling tool 5 based on the distortion of the marker (M2), regardless of the position of the worker's viewpoint or the worker's level of skill.

[0038] 8, the construction surface is assumed to be horizontal, but strictly speaking, the distortion of the marker (M2) is distorted from the shape it had when the drilling work started. Therefore, even if the construction surface is not horizontal or has some unevenness, the inclination of the drilling tool 5 can be determined by comparing it with the shape it had when the drilling work started.

[0039] In other words, by setting the target position (P1) at the start of the work at a position where the shape of the marker (M2) can be easily grasped, it becomes possible to easily check for distortion during the drilling work. In other words, the configuration of the auxiliary tool 1, which allows any location to be set as the target position (P1) at the start of the drilling work, is extremely useful in actual use where slight unevenness or inclination is expected.

[0040] During drilling, the auxiliary tool 1 repeatedly performs an operation (T6) of measuring the current distance (B) to the drilling surface, and an operation (T7) of calculating the current drilling length (C) as the difference between the start distance (A) and the current distance (B), as shown in Figure 4, until the remaining distance to the target drilling length (D) falls below a predetermined notification reference value (T8; NO). The notification reference value may be set arbitrarily, for example, to 20 mm, and may be set appropriately depending on the condition of the drilling surface, the type of anchor being used, etc.

[0041] In response to this, when the difference between the target drilling length (D) and the current drilling length (C) falls below a predetermined notification threshold, i.e., when the target drilling length (D) is approached (T8: YES), the auxiliary tool 1 intermittently sounds the buzzer 11 (T9) and flashes the LED light 7 (T10). This allows the operator to recognize that the target drilling length (D) is being approached by the sounding of the buzzer 11 and the flashing of the LED light 7 (S10). At this time, the notification mode can be changed depending on the remaining distance, for example, by shortening the sounding period or flashing period or increasing the frequency of the buzzer 11 as the target drilling length (D) is approached. This allows the operator to take appropriate measures, such as working more carefully as the target drilling length (D) is approached.

[0042] When the target drilling length (D) is approached, the target drilling length (D) has not yet been reached, and the drilling operation continues. Therefore, as shown in FIG. 8, the auxiliary tool 1 measures the current distance (B) (T11), calculates the drilling length (C) (T12), and repeats the process until the drilling length (C) reaches the target drilling length (D) (T13: NO). When the drilling length (C) reaches the target drilling length (D) (T13: YES), the auxiliary tool 1 continuously sounds the buzzer 11 (T14) and continuously lights the LED light 7 (T15). In this case, the LED light 7 can be configured to flash yellow when the target drilling length (D) is approached, and to turn red and flip over when the target drilling length (D) is reached.

[0043] This allows the operator to recognize that the target drilling length (D) has been reached (S11), and so ends the drilling operation (S12). The operator then refers to the spirit level 6 and marker (M2) to check the position and attitude of the drilling tool 5 (S13). In this step S13, although the drilling tool 5 maintains a vertical attitude during the drilling operation as described above, the operator checks whether the drilling tool 5 is in an appropriate position and vertical state in order to correctly measure the drilling length (C).

[0044] After confirming the position and posture of the drilling tool 5, the worker stores the drilling length (C) in the auxiliary tool 1, for example by pressing the OK button (S14). In response, the auxiliary tool 1 measures the current distance (B) to the work surface while the drilling tool 5 is maintained in the appropriate posture (T16), calculates the drilling length (C) (T17), and stores the calculated drilling length (C) and displays it on the display 9 (T18). At this time, the auxiliary tool 1 stores the drilling length (C) in association with a count indicating the drilling position, making it possible to use it as work history, as described below. Note that when work is completed, the maximum value of the drilling length (C) calculated during the drilling work can also be stored.

[0045] The assistive device 1 also stops the buzzer 11 (T19) and turns off the LED light 7 (T20). Note that the stopping of the buzzer 11 and the turning off of the LED light 7 may be performed in any order after step S14. The LED light 7 may also change color instead of being turned off to indicate that the task has finished.

[0046] In this way, the drilling work is performed using the auxiliary tool 1. After the drilling work is completed, the auxiliary tool 1 outputs the final drilling length (C) to an external device such as a personal computer via the output unit. This makes it possible to output the drilling length (C) as a work history or to read it from an external device. Therefore, the auxiliary tool 1 also contributes to improving the efficiency of work other than the drilling work, such as maintaining work records.

[0047] According to the embodiment described above, the following effects can be obtained. The auxiliary tool 1 is attached to the drilling tool 5 and includes a spirit level 6 and an illuminator 13 that irradiates laser light toward a target position that is set at a position different from the actual drilling position on the construction surface. This allows the worker to perform the drilling work while checking the positional relationship between the marker (M2) and the target mark (M1), and therefore allows a single worker to perform the drilling work with consistent quality even when the drilling position (P0) is viewed obliquely or cannot be viewed directly.

[0048] In addition, auxiliary tool 1 irradiates a cross-line laser including two intersecting line segments toward the target position, which allows drilling a vertical hole at the appropriate position regardless of the worker's viewpoint or level of skill, even if it is difficult to check level 6 due to vibration.

[0049] The auxiliary tool 1 includes a measuring device 12 that measures the distance to the work surface, a memory unit 15 that stores a target drilling length preset for the drilling position, and an alarm unit that notifies the operator when the drilling length (i.e., the depth of the hole during drilling) reaches the target drilling length. This allows the operator to know that the target drilling length has been reached even while concentrating on maintaining the position of the drilling tool 5, improving convenience. While it would be beneficial to notify the operator audibly using a buzzer 11, as in the embodiment, it is expected that the operator will wear earplugs to protect their hearing during drilling. Therefore, providing an alarm unit that notifies the operator visually, such as an LED light 7, ensures that the operator is notified reliably.

[0050] When the difference between the drilling length and the target drilling length falls below a predetermined notification threshold, the auxiliary tool 1 issues a notification in a different manner than when the target drilling length is reached. This allows the operator to recognize that the target drilling length is approaching before it is reached, allowing them to take appropriate action, such as drilling more carefully. It also prevents unnecessary holes from being drilled, improving work efficiency.

[0051] The auxiliary tool 1 is equipped with an output unit that outputs the drilling length to an external device. By configuring this output unit with the communication unit 16 as in the embodiment, it becomes possible to output the stored drilling length (C) as a work history and to read it from an external device. Therefore, it is possible to improve the efficiency of tasks other than drilling, such as maintaining work records.

[0052] The auxiliary tool 1 is provided with an alternative handle 3 that replaces the existing handle 5a of the drilling tool 5, and is attached to the drilling tool 5 together with the alternative handle 3. By attaching the auxiliary tool 1, it becomes possible to support the drilling tool 5 with both hands, and the posture of the drilling tool 5 during drilling work can be stabilized. Furthermore, even in the case of a tool that is operated with one hand, the addition of the alternative handle 3 makes it possible to perform drilling work in a more stable posture.

[0053] The auxiliary tool 1 includes an adjustment unit 20 for adjusting the direction of irradiation of the cross line laser. This allows the optical axis (LD) to be made parallel to the rotation axis (J0) of the drill 5c even if the optical axis (LD) is tilted when the auxiliary tool 1 is attached and is not parallel to the rotation axis (J0).

[0054] Furthermore, as shown in FIG. 9 as an example of a shape, the irradiation port 17 may be provided with a cross-shaped slit for a cross-ray laser, as well as a ring-shaped slit for irradiating the laser beam in a circular shape. In this case, as shown as an example of a mark, a marker (M21) including a cross shape and a circle is irradiated onto the work surface. When the drilling tool 5 is tilted, as shown in the right-tilted state or the forward-tilted state, not only the cross shape of the marker (M21) but also the circle is distorted, making it easier to grasp the position of the drilling tool 5, and achieving various effects similar to those of the embodiment. Note that the shape is not limited to a circle, and a configuration capable of irradiating shapes such as a rectangle or a triangle may also be used.

[0055] Also, in order to mark a target mark (M1) at the position of the marker (M2), it is possible to provide a dripping unit 30, for example, as shown in Fig. 10. As shown in side and bottom views, dripping unit 30 includes a storage unit 31 for storing a liquid such as ink, a pipe 32 extending from storage unit 31 to the center of the cross-shaped slit while avoiding the cross-shaped slit, a valve body 33 provided midway along pipe 32, and an operating member 34 for opening and closing valve body 33.

[0056] When starting the drilling operation, the drilling tool 5 is positioned and oriented appropriately, and the operator operates the operating member 34, which opens the valve body 33 and causes ink to drip vertically as shown in the example mark, leaving a target mark (M1) at the target position (P1). In this case, one operator can maintain the orientation of the drilling tool 5 and set the target make (M1), thereby improving work efficiency.

[0057] The configuration of the dripping unit 30 shown in Figure 10 is an example, and other configurations are possible. For example, by providing the piping 32 at the end of the cross-shaped slit as well, it is possible to attach auxiliary marks (M11 to M14) to the ends of each line segment of the marker (M2), as shown as an example of auxiliary marks, making it easier to recognize changes in the posture of the drilling tool 5. It is also possible to set the auxiliary marks (M11 to M14) manually without providing the dripping unit 30. In this case, the use of the auxiliary device 1 is still beneficial.

[0058] In the embodiment, a configuration has been exemplified in which the actual drilling length (C) is determined by measuring the distance to the construction surface using the measuring device 12, but even if the measuring device 12 is not provided, the position and posture of the drilling tool 5 can be grasped using the marker (M2) as described above. Therefore, it is meaningful to use the auxiliary device 1 even when a so-called depth gauge that physically determines the drilling length is attached to the drilling tool 5 and the drilling work is completed when the depth gauge abuts the construction surface.

[0059] In the embodiment, the difference between the start distance (A) and the current distance (B) when the tip of the drill 5c is in contact with the construction surface (CS) is calculated as the drilling length (C), but the tip of the drill 5c is actually slightly tilted. For example, an anchor to be embedded in a hole has a specified embedding length for proper installation, and the part that is roughly equal to the diameter of the drill 5c needs to be equal to or longer than the embedding length.

[0060] In other words, if the difference between the start distance (A) and the current distance (B) is simply set as the drilling length (C), the depth may be insufficient by the amount of the tip shape of the drill 5c. Therefore, for example, by taking the tip shape of the drill 5c into account when calculating the current drilling length (C), or by taking the tip shape of the drill 5c into account when determining the set target drilling length (D), it is possible to drill a hole of an appropriate depth.

[0061] Although the embodiment shows an example of drilling holes in concrete, the auxiliary tool 1 can also be applied to drilling holes in construction surfaces other than concrete. For example, the auxiliary tool 1 can be effectively used in drilling holes in bricks to pass a pipe vertically through them. Although the embodiment shows an example of drilling a hole in a floor surface, by using a so-called vertical vial as the level 6, a hole perpendicular to the vertical direction can be formed in a wall surface.

[0062] In the embodiment, a configuration example using a round level has been shown, but a so-called bubble tube can also be arranged in a perpendicular direction to allow for checking tilt in the forward, backward, left and right directions. In the embodiment, an example of a configuration in which the alternative handle 3 is attached to the drilling tool 5 has been shown, but a configuration in which the housing 2 is attached to the existing handle 5a may also be used.

[0063] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0064] In the drawings, 1 indicates an auxiliary tool, 3 indicates an alternative handle, 5 indicates a drilling tool, 5a indicates a handle, 6 indicates a spirit level, 7 indicates an LED light (alarm unit), 9 indicates a display (alarm unit), 11 indicates a buzzer (alarm unit), 12 indicates a measuring instrument, 13 indicates an irradiator, 15 indicates a memory unit, 16 indicates a communication unit (output unit), 20 indicates an adjustment unit, and 30 indicates a dripping unit.

Claims

1. Attached to a drilling tool, A spirit level and an irradiator that irradiates laser light toward a target position that is set at a position different from the drilling position where a hole is actually drilled on the work surface; An auxiliary tool for drilling work.

2. 2. The auxiliary tool for drilling work according to claim 1, wherein the irradiator irradiates a cross-line laser including two intersecting line segments toward the target position.

3. A measuring instrument for measuring the distance to the construction surface; a storage unit that stores a target drilling length that is preset for the drilling position; a notification unit that notifies the operator that a drilling length, which is the depth of a hole during drilling work, has reached a target drilling length; 2. The auxiliary tool for drilling work according to claim 1, comprising:

4. 4. An auxiliary tool for drilling work as described in claim 3, wherein the notification unit notifies in a different manner from when the target drilling length is reached when the difference between the drilling length and the target drilling length becomes smaller than a predetermined notification standard value.

5. 2. The auxiliary tool for drilling work according to claim 1, further comprising an output section for outputting the drilling length to an external device.

6. The drilling tool is provided with a replacement handle that replaces an existing handle, 2. The drilling assistant according to claim 1, wherein the alternative handle is attached to the drilling tool.

7. 2. The auxiliary tool for drilling work according to claim 1, further comprising an adjustment unit for adjusting the direction of irradiation of the laser light.

8. 2. The auxiliary tool for drilling work according to claim 1, further comprising a dripping unit for dripping a liquid as a marker at a target position.

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