JP5469492B2 - Drilling male blade and drilling tool - Google Patents

Description

  The present invention provides a drilling male blade used for a drilling tool capable of manually drilling a through-hole in a metal base material having a substantially U-shaped cross section installed as a base on the back surface of a wall or ceiling, and the drilling male blade. The present invention relates to a drilling tool provided.

  As described above, as an example of the drilling male blade and the drilling tool, there is one described in Patent Document 1, and FIG. 8 shows the drilling described in Patent Document 1, which is the background art of the drilling tool of the present invention. It is a front view which shows a tool.

  This drilling tool 20 includes a drilling male blade 15 having a conical base portion 15a, a cylindrical blade 16 corresponding thereto, and a main body 17 having a holding handle 17a for holding the cylindrical blade 16 and holding the whole. The punching male blade 15 is held so as to be able to advance and retract, and a movable portion 18 capable of moving up and down and rotating with respect to the main body 17 is provided.

  The movable portion 18 includes a movable handle 18a, and by vertically moving and rotating the movable handle 18a with respect to the main body 17, it is possible to manually drill a through-hole having an inclined edge in a metal base material. .

  However, in this drilling tool 20, the drilled male blade 15 is an asymmetrical cutting blade with respect to the center of the drilling, so that the hole to be drilled tends to deviate from the original axis, and to the cylindrical blade 16. There is a possibility that the accuracy of the penetration of the perforated male blade 15 is impaired.

  On the other hand, when the perforated male blade is formed in a general left-right symmetry, a large force is required due to the drag that gradually increases during perforation, and it cannot be said that perforation is easy. On the other hand, if the angle of the drilling blade is sharpened in order to reduce the force required for drilling, the entire drilling male blade must be formed long, in which case the drilling male blade is very edged, Handling becomes difficult.

JP 2009-274083 A (FIG. 1)

  The present invention is intended to ameliorate the above-described problem. A perforated male blade capable of increasing the perforating force and accurately drilling without increasing the overall axial length of the perforated male blade, and the perforation. An object of the present invention is to provide a drilling tool having a male blade.

The perforated male blade of the present invention is a perforated male blade used for a perforating tool capable of manually drilling a through-hole in a metal base material having a substantially U-shaped cross section installed as a base on the back surface of a wall or ceiling. ,
The perforated male blade has a circular shape in plan view in the direction of the central axis of the through-hole to be drilled, and is symmetrical with respect to the central axis in a side view in the plane direction including the central axis, and becomes a starting point for drilling. A tip projection, a foundation blade that is continuous with the tip projection and has a large angle with respect to the center axis, and a center blade that is continuous with the foundation blade and that gradually increases with drilling. An inflection part bent so that the angle formed by the arm is small, and a punching blade having the inflection part and having a shape in which the left and right are connected at the extreme end portion.

  In other words, this drilling male blade, when forming a through-hole in a metal base material manually, first makes the blade shape symmetrical to prevent the generation of biased force during drilling. It is characterized in that drilling can be performed at various positions.

  Also, under the condition that the through-hole is manually drilled by the blade provided on the outer periphery of the circular blade, the penetration force is considered to be not constant as the drilling proceeds. Using two types of blades, a basic blade with a different angle with respect to the central axis of the circular hole and a punching blade with an inflection part, the required force is averaged, and as a result, the overall length of the drilled male blade is shortened. Have achieved that.

  Further, in the perforated male blade of the present invention, the inflection portion is configured so as to correspond to a position at which more than half of the through-hole is cut in a plan view, so that the force required for perforation can be averaged. The position of the music point is clarified.

  Further, in the drilled male blade of the present invention, the tip protrusion is configured to be a tip blade having an acute angle with respect to the central axis, thereby making the start of drilling more reliable.

A drilling tool of the present invention is a drilling tool for drilling a through hole in a metal base material having a substantially U-shaped cross section installed as a base on the back surface of a wall or a ceiling, and a main body provided with a holding handle, and the main body And the perforated male blade of the present invention provided so as to be capable of advancing and retracting to be inserted into the cylindrical blade,
The perforated male blade is provided on a movable handle that is movable and pivotally supported by the main body, and is moved forward and backward by moving the movable handle close to and away from the cylindrical blade.
The movable handle is advanced, and the cylindrical blade and the drilled male blade sandwich the base material, and the movable handle is rotated manually to penetrate the drilled male blade into the cylindrical blade. A hole can be drilled, and the effect of the drilled male blade can be exhibited as a drilling tool.

  The effects of the drilling blade of the present invention and the drilling tool provided with this drilling blade are as described in the above means.

It shows an example of a drilling male blade and a drilling tool of the present invention, (a) is a front view showing the whole drilling tool, (b) is an external perspective view showing the cylindrical blade, (c), Top view of the perforated male blade, (d) is a side view of the perforated male blade of (c) (A) is a longitudinal cross-sectional view of the drilling tool of FIG. 1, (b) is an external perspective view showing a metal base material to be drilled. The front view which shows the initial stage process of the usage condition of the drilling tool of FIG. The front view which shows the medium-term process of the usage condition of the drilling tool of FIG. The front view which shows the completion process of the use aspect of the drilling tool of FIG. (A)-(e) is a figure which shows the process of drilling a through-hole in a metal base material in order with the perforation male blade of FIG. (A) is an external perspective view showing a metal base material provided with a through hole through the process of FIG. 6, and (b) is a cross section showing a state where a protective bush is mounted in the through hole. Figure The front view which shows the drilling tool used as the background art of the drilling tool of this invention

1 Tip protrusion (tip blade)
DESCRIPTION OF SYMBOLS 2 Base blade 3 Punching blade 4 Inflection part 5 Perforated male blade 6 Tube blade 7 Main body 7a Holding handle 8 Movable part 8a Movable handle 10 Drilling tool H Through-hole K Metal base material M Center axis

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1

  FIG. 1 shows an example of a drilling male blade and a drilling tool of the present invention, (a) is a front view showing the whole drilling tool, (b) is an external perspective view showing the cylindrical blade, c) is a top view of the drilling male blade, (d) is a side view of the drilling male blade of (c), FIG. 2 (a) is a longitudinal sectional view of the drilling tool of FIG. 1, and (b) is It is an external appearance perspective view which shows the metal base material which is a piercing | piercing object.

  This drilling tool 10 is capable of manually drilling a through-hole in a metal base material K having a substantially U-shaped cross section installed as a base on the back surface of a wall or ceiling. Have

  The perforated male blade 5 has a circular shape in plan view in the direction of the central axis M of the through-hole to be perforated as shown in FIG. 1C, and the blade shape projected on the plane including the central axis M is As shown in FIG. 1 (d), the tip protrusion 1 is symmetrical with respect to the central axis M and becomes a hole for perforation, and a basic blade that is continuous with the tip protrusion and has a large angle with respect to the central axis M, An inflection part 4 bent to reduce an angle formed with respect to the central axis so as to reduce a cutting drag that continues to the base blade and gradually increases with drilling, and the inflection part 4, and an endmost part It is comprised from the punching blade 3 used as the shape where right and left connect.

  This perforated male blade 5 is characterized by the above-described configuration, and as described in detail later, the perforating force is increased without increasing the overall axial length of the perforated male blade 5, and It can be drilled accurately.

  The perforated male blade 5 has a circular shape in plan view and perforates a through-hole. At that time, the tip protrusion 1 first enters the metal base to be cut left and right symmetrically, and then has a smaller force. The first half arc part that can be cut with is drilled with the foundation blade 2 and the inner half arc part where a larger force is required is drilled with the inflection part 4 and the punching blade 3 to average the force required for drilling. It has become.

Here, as shown in FIG. 1 (d), the angle formed by the tip protrusion 1 and the central axis M is the tip protrusion angle α,
The angle formed by the basic blade 2 with the central axis M (the average angle of the curved basic blade in this figure) is the basic blade angle β, and the angle formed by the punching blade 3 in the vicinity of the inflection part 4 with the central axis M. When the punching blade angle γ is used, the tip protrusion angle α is smaller than the basic blade angle β, and the punching blade angle γ is smaller than the basic blade angle β. The size between the tip protrusion angle α and the punching blade angle γ may be the same, or one may be larger than the other.

  Here, the basic blade may be a straight line when viewed from the side, and in this case, the angle formed by the straight line and the central axis M is the basic blade angle β. Further, the basic blade may be a slightly wavy blade, and in this case, the corner of the basic blade is as defined above. Moreover, although the left-right continuous part of the punching blade is continuing in the direction orthogonal to the central axis M, the height of the entire perforated male blade 5 can be reduced in this way. On the other hand, the tip of the punching blade may be continuous so as to form an angle. In any case, it is desirable that there is a clear inclination change in the inflection part.

  In either case, it is clearly inclined from the foundation blade to the inflection part so that the punching blade angle γ is smaller than the angle formed by the straight line portion of the foundation blade continuous with the inflection part with respect to the central axis M. Has been changed. By configuring in this way, when the blade for cutting the base material K of the leading male blade 5 is switched from the basic blade to the inflection portion of the punching blade, it is possible to give momentum to the drilling. Further, although the portion where the base blade and the inflection portion are continuous is formed to be angular, it may be slightly rounded and smoothly continuous.

  Due to the above-described configuration of the perforated male blade 5, if the entire punching blade 3 is configured as a whole, the apparent blade length is L1, and the blade length L0 is about 50%. Therefore, the perforated male blade 5 is easy to handle and is more safe.

  The outer peripheries of the tip projection 1, the basic blade 2, and the punching blade 3 of the perforated male blade 5 are circumferential and are referred to as a blade circumferential portion 5a. A base end portion of the blade circumferential portion 5a has a conical base portion 5b, and a peripheral portion continuous with the conical base portion 5b is defined as a base end peripheral portion 5c. A fitting projection 5d for fitting the perforated male blade 5 into the movable portion 8 is provided further on the side opposite to the base end peripheral portion 5c.

  On the other hand, the drilling tool 10 provided with the drilling male blade 5 includes a main body 7 provided with a holding handle 7 a and a cylindrical blade 6 provided on the main body 7, and the drilling male blade 5 is connected to the cylindrical blade 6. It is provided so that it can be advanced and retracted.

The perforated male blade 5 is provided on a movable handle 8a that is movable and pivotally supported by the main body 7 with respect to the cylindrical blade 6, and is moved close to and away from the intermediate handle 8b of the movable handle 8a. Is advancing and retracting
The movable handle 8a is advanced, and the perforated male blade 5 penetrates into the cylindrical blade 6 by rotating the movable handle 8a manually by sandwiching the base material K between the cylindrical blade 6 and the perforated male blade 5. It is configured to be able to drill a circular hole.

  In addition to the described parts, this drilling tool 10 is provided on its main body 7 side with a holding handle 7a, a through long hole 7b allowing movement of the movable handle 8a, and a rotating handle of the movable handle 8a. A rotation hole 7c that allows movement and a cylindrical blade holding portion 7e that holds the cylindrical blade 6 are provided.

  Further, the drilling tool 10 has an elliptical shape on the side of the movable part 8 movable with respect to the main body 7 and an oval shape serving as a fulcrum for movement and rotation of the movable handle 8a, the intermediate gripping part 8b, and the movable handle 8a. A shaft portion 8c, a working shaft 8d provided on the opposite side of the movable handle 8a with respect to the shaft portion 8c, and a moving blade receiving shaft 8e that moves up and down by the working shaft 8d are provided.

  At the tip of the movable blade receiving shaft 8e, there is provided a fitting recess 8f for fittingly fitting the fitting projection 5d of the perforated male blade 5 in a replaceable manner. A spring 8g for urging the movable blade receiving shaft 8e, that is, the drilled male blade 5 upward, is provided between the base end peripheral portion 5c of the drilled male blade 5 fitted to the movable blade receiving shaft 8e and the main body 7. In the state shown in FIG. 1A, the force that moves the entire perforated male blade 5, the movable blade receiving shaft 8e, and the movable portion 8 to the opposite cylindrical blade 6 is assisted.

  As shown in FIG. 2A, the oval shaft portion 8c is fitted into the through long hole 7b on the main body 7 side, and moves up and down in the narrow portion (straight portion), and the wide portion (circumference) Part) in the rotation hole 7c.

  As shown in FIG. 2B, the metal base material K is generally “U” -shaped as a whole, and is normally used with its opening side upward. The rising portions on both sides are referred to as a side wall portion Ka, and the portion connecting the side wall portions Ka is referred to as a bottom portion Kb. The bottom portion Kb is normally on the indoor side, and the drilling by the drilling tool 10 is also performed on the bottom portion Kb.

  The material of the metal base material K is an ordinary plated steel plate having a thickness of 0.5 mm to 0.8 mm, a fold is provided at the end of the side wall Ka, and the cut end is woven inward, The base material K can be easily handled.

  In addition, the drilling tool 10 is provided with a drilling position adjusting unit 9 for the metal base material K. The perforation position adjusting unit 9 is installed on the main body 7 so that the positioning rod 9a can be adjusted in its entry / exit length, and the side wall portion Ka of the metal base material K is brought into contact with the end surface of the positioning rod 9a. By doing so, the through-hole H can be formed at an appropriate position such as the center of the bottom Kb of the metal base material K.

  In the illustrated one, a plurality of concave grooves are provided at predetermined intervals on the outer periphery of the positioning rod 9a, and there is a biasing protrusion that fits into the concave groove with a constant biasing force on the outer peripheral side. The scale for is correspondingly provided. However, the structure may be such that the hexagon bolt is simply moved forward and backward, and the structure is not limited as long as the position can be easily adjusted. Further, the perforation position adjusting unit 9 may not be provided.

  As shown in FIG. 1B, the cylindrical blade 6 on the female side of the drilling has a cylindrical shape, a cylinder inner peripheral portion 6a corresponding to the blade circumferential portion 5a of the drilled male blade 5, and a conical base portion. A conical portion 6b corresponding to 5b and an end surface portion 6c corresponding to the base end peripheral portion 5c are provided.

  From this, the effect of the drilling male blade 5 of this invention and the usage aspect of the drilling tool 10 are demonstrated using FIGS. 3-6. FIG. 3 is a front view showing an initial step of the usage mode of the drilling tool of FIG. Accordingly, the same reference numerals are given to the parts that have already been described, and redundant description is omitted.

  First, as shown in FIG. 3, in the same state as in FIG. 1, that is, in a state where the maximum distance is maintained between the perforated male blade 5 and the cylindrical blade 6, the cylindrical blade 6 is made of a metal that has already been installed. The base material K is held so as to be positioned at the concave portion, that is, at the bottom Kb sandwiched between the side portions Ka.

  At this time, if the front end of the positioning rod 9a is in contact with the outside of one side portion Ka, in this case, the cylindrical blade 6, that is, the perforated male blade 5, is positioned at the width center of the bottom portion Kb. ing. However, it may be located at a biased position by adjusting the positioning rod 9a.

  Further, in this state, there is a sufficient space between the cylindrical blade 6 and the perforated male blade 5, so that the cylindrical blade 6 can be used by overcoming the side portion Ka of the base material K when installing a ceiling or the like. It is easy to do in the position of.

  FIG. 4 is a front view showing a mid-stage process of the use mode of the drilling tool of FIG. 1, holding the intermediate gripping part 8 b of the movable handle 8 a and moving it upward in the same posture. 5 shows a state in which 5 is brought close to the base material K.

  FIG. 5 is a front view showing a completion process of the use mode of the drilling tool of FIG. 1. From the state of FIG. 4, the movable handle 8 a is rotated so that the drilling male blade 5 completely enters the cylindrical blade 6. It is a state, and shows a state in which drilling has been completed.

  6 (a) to 6 (e) are diagrams sequentially illustrating a process of drilling a through hole in a metal base material with the perforated male blade of FIG. 1, and the perforated male blade as the movable handle 8a rotates. 5 shows in more detail a mode in which the through-hole H is drilled in the bottom Kb of the base material K.

  FIG. 6A shows the same state as FIG. 4 as a cross-sectional view of the main part. .

  FIG. 6B shows a state in which perforation has started by the tip protrusion 1 first entering the bottom Kb as the movable handle 8a rotates. In addition, from this figure, a top view of the base material K being drilled in the upper part thereof is shown together with a cross-sectional view. At this time, since the tip protrusion 1 is bilaterally symmetric, there is no lateral movement of the drilled male blade 5 with respect to the bottom Kb due to the drilling force, and accurate drilling can be performed.

  FIG. 6C shows a state in which the base blade 2 of the perforated male blade 5 is perforated. In this process, since the cutting length with respect to the rising degree of the circular hole portion cut by the basic blade 2 is small, even if the angle β with respect to the central axis M of the basic blade 2 is increased, the force necessary for operating the movable handle 8a Will not grow.

  FIG. 6 (d) shows a state where the punching blade 3 of the drilled male blade 5 is punched. In this process, since the cutting length with respect to the rising degree of the circular hole portion cut by the basic blade 2 is long, the angle γ with respect to the central axis M of the punching blade 3 is reduced, and the force necessary for operating the movable handle 8a. However, it is made not different from the case of the basic blade 2.

  FIG. 6 (e) shows a state in which drilling has been completed at the punching blade 3 portion of the drilled male blade 5. At this time, the punched piece Kc punched by the perforated male blade 5 is sufficiently smaller than the inner diameter of the cylindrical blade holding portion 7e supporting the cylindrical blade 6 and is bent along the shape of the perforated male blade 5 Therefore, actually, it does not stay on the perforated male blade 5 as shown in the figure, but jumps out through the tube blade holding portion 7e.

  In other words, the punched piece Kc is sufficiently separated from the blade, and it is not necessary to manually remove the punched piece Kc after drilling. On the other hand, when it is not preferable that the punched piece Kc pops out and scatters, the scattering problem can be solved by providing a recovery portion for the punched piece Kc outside the cylindrical blade holding portion 7e.

  As can be seen from FIGS. 1 (d) and 6 (d), the inflection 4 between the foundation blade 2 and the punching blade 3 is a position corresponding to a position where more than half of the through-hole is cut. ing. This is because the operating force of the movable handle 8a by hand is more averaged if it is provided at that position from experience.

Further, in this example, the tip projection 1 is sharp as the tip blade 1 having an acute angle with respect to the central axis M, but the tip projection 1 may be any one that triggers perforation,
It is not always necessary to use a sharp cutting blade. For example, the base blade 2 may be provided up to the tip as it is to form a tip protrusion.

  FIG. 7A is an external perspective view showing a metal base material provided with a through hole through the process of FIG. 6, and FIG. 7B shows a state in which a protective bush is attached to the through hole. It is sectional drawing shown.

  The perforated through hole H is precisely located at a desired position of the base material K, and the circular hole edge portion Ha is tapered. This is formed by the conical base portion 5b of the perforated male blade 5 and the conical portion 6b of the cylindrical blade 6. As shown in FIG. 7B, the through-hole H is protected with a synthetic resin or the like. Even if the bush B is fitted, the lower part thereof does not come out below the bottom Kb of the base material K, so that it does not hinder the attachment of the ceiling panel or the like attached to the base material K.

  Thus, according to the drilling male blade of the present invention and the drilling tool using the same, the drilling force can be increased and the drilling can be performed accurately without increasing the overall axial length of the drilling male blade.

  In addition, the drilling male blade and the drilling tool of the present invention are not limited to the above-described embodiments, and various modifications and combinations are possible within the scope described in the claims and the scope of the embodiments. Such modifications and combinations are also included in the scope of the right.

  For example, the punching blade 3 of the perforated male blade 5 is a position where the left and right ones are connected, and its blade surface is perpendicular to the central axis M of the through-hole H. The connecting part of the blade may form a certain angle.

  The perforated male blade and the perforated tool of the present invention are industrial fields related to pipe connection in which it is required to increase the perforating force and accurately perforate without increasing the overall axial length of the perforated male blade. Can be used.

Claims (4)

A perforated male blade used for a drilling tool capable of manually drilling a through hole in a metal base material having a substantially U-shaped cross section installed as a base on the back of a wall or ceiling,
The perforated male blade has a circular shape in plan view in the direction of the central axis of the through-hole to be drilled, and is symmetrical with respect to the central axis in a side view in the plane direction including the central axis, and becomes a starting point for drilling. A tip projection, a foundation blade that is continuous with the tip projection and has a large angle with respect to the center axis, and a center blade that is continuous with the foundation blade and that gradually increases with drilling. a curved portion which angle is bent so as to reduce Te, with the inflection portion, wherein the left and right endmost portion and a punching blade is Tsu Do shaped connecting drilling Male blade.   The perforated male blade according to claim 1, wherein the inflection portion corresponds to a position obtained by cutting a half or more of the through-hole with a basic blade in plan view.   The perforated male blade according to claim 1, wherein the tip protrusion is a tip blade whose angle with respect to the central axis is smaller than a basic blade. A drilling tool for drilling a through hole in a metal base material having a substantially U-shaped cross section installed as a base on the back of a wall or ceiling,
A main body provided with a holding handle, a cylindrical blade provided in the main body, and a perforated male blade according to any one of claims 1 to 3 provided so as to be capable of advancing and retracting to be inserted into the cylindrical blade,
The perforated male blade is provided on a movable handle that is movable and pivotally supported by the main body, and is moved forward and backward by moving the movable handle close to and away from the cylindrical blade.
The movable handle is advanced, and the cylindrical blade and the drilled male blade sandwich the base material, and the movable handle is rotated manually to penetrate the drilled male blade into the cylindrical blade. A drilling tool characterized by being capable of drilling holes.

Images