JPH0731310U - Woodworking - Google Patents

Abstract

(57) [Summary] [Purpose] When perforating an inclined surface of a work material, prevent woodworking from being displaced, and facilitate perforating with a light force. [Structure] A central protrusion 9 is provided at the center of the tip of the drill body 1 along the axis, a drill 10 is formed on the tip side of the center projection 9, and a thread 11 is formed on the root end. The amount of protrusion of the central protrusion 9 from the marking blade 4 is made larger than the radius of the marking blade 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of woodworking.

[0002]

[Prior art]

 Some conventional woodworking drills have a drill body 2 with a front screw 2 protruding from the center of the tip of the drill body 1 as shown in FIGS. When drilling with such a wood cutting tool with a tip screw, the tip screw 2 enters the wood, and then the material is cut by the cutting blade 3 and the scribing blade 4 at the tip of the drill body 1, It is to make a hole. The cutting blade 3 cuts the bottom surface of the hole that has been drilled. The scribing blade 4 is for cutting the fibers of the wood, and this prevents the edges of the holes from being blunted and the wings from coming out.

Further, there is a conventional woodworking drill, as shown in FIG. 6, in which a three- or four-cut drilling center cone 5 is provided at the center of the tip of the drill body 1. The central cone 5 is used for positioning the holes to be drilled and for facilitating the discharge of cutting chips in the spiral chip groove 6 of the body of the drill body 1.

[0004]

[Problems to be solved by the device]

 As shown in FIG. 4, there is a case in which a hole is formed obliquely to the surface of the workpiece 7 by using the above-mentioned conventional woodworking tool with a lead screw. In this case, the center position 0 of the hole to be machined on the surface of the workpiece 7 is first drawn as the intersection of the black and white lines X and Y intersecting at right angles. Next, the tip of the front screw is applied to the center position 0, and the drill body 1 is rotated by an electric drill body (not shown). At the start of rotation of the drill body 1, as shown in FIG. 4, the drill body 1 is inclined, so that the thread 8 protruding from the tip of the tip screw 2 rotates and the workpiece 7 of the workpiece 7 rotates. If the front screw 2 of the drill body 1 slides in the direction of the arrow B upon hitting the surface, a deviation of Δy occurs as shown by the alternate long and short dash line in the figure.

Further, when the scribing blade 4 at the front end of the drill body 1 which is rotating before the tip screw 2 is sufficiently embedded in the work material 7 hits the surface of the workpiece 7, the rotational force of the drill body 1 is increased. Then, the drill body 1 is displaced by the distance Δx in the black line X direction in FIG.

From these things, even if the tip of the front screw 2 is aligned with the desired center position 0, when the drill body 1 starts to rotate for drilling, the tip of the front screw 2 is as shown in FIG. In addition, it was displaced by Δx in the black line X direction and Δy in the black line Y direction and was displaced to the position of the hole shown by the alternate long and short dash line in the figure, making it difficult to accurately drill at the desired position shown by the solid line in the figure.

In addition, when a woodworking drill having a central cone 5 at the tip of the drilling body 1 as shown in FIG. 6 is used to form a diagonal hole in the surface of the workpiece 7. Since the central cone 5 has no screw thread, when the rotation of the drill body 1 is disclosed, the screw thread does not cause a positional deviation of the woodworking drill unlike the woodworking drill with a lead screw. However, since the central cone 5 does not have any ridge, even if the central cone 5 is rotated, the thrust force for cutting into the workpiece 7 does not work. Therefore, when drilling with a hand-held power tool that uses a woodworking tool with a central cone, there is great resistance to push the central cone 5 into the workpiece 7, and thrust does not work. There was a problem of needing.

[0008] Furthermore, regardless of whether a woodworking drill with a lead screw or a woodworking drill with a central cone is used, when drilling a hole with a large inclination angle from the vertical direction with respect to the surface of the workpiece 7, the lead screw 2 Before the tip of the tool or the center cone 5 hits the surface of the work piece 7, the marking blade 4 of the woodworking tool 1 hits the surface of the work piece 7, and the tip screw 2 or the tip of the center cone 5 works. The material 7 does not enter sufficiently and cannot be positioned reliably. Therefore, when the drill body 1 is rotated for drilling in this state, the marking blade 4 hits the workpiece 7 and moves the tip of the drill body 1, so that the drill body 4 is accurately positioned and drilled at the correct position. There was a problem that it was difficult to do.

In view of the above points, the present invention can accurately position the tip of the drill body even when drilling a slanted hole in the surface of a workpiece, and further, rotating the drill body to drill the drill during drilling. The purpose of the present invention is to provide a new woodworking tool that can be easily fed by the action of the thrust acting on the main body to reduce the labor required for work, and can be drilled accurately at the desired position.

[0010]

[Means for Solving the Problems]

 In the woodworking drill of the present invention, a central projecting portion that is concentric with the axial center of the drilling body is provided at the center of the leading end of the drilling body. It is formed on a conical drilled part such as a conical part, and a screw thread part is formed on the root end side part of the central protruding part.The length of the part of the central protruding part protruding from the scribing blade at the tip of the scissor body It is characterized by being configured to be longer than half the outer diameter.

[0011]

[Action]

 With the above-mentioned configuration, when a hole that is inclined with respect to the surface of the work material is formed by using a woodworking drill, the drilling part of the central protrusion of the woodworking tool sufficiently sticks into the work material and Since the body is positioned and held at the desired position, when the drill body is turned to advance through the hole, the thread portion of the central protrusion may hit the work material and slide the drill part to change the position. In addition, even if the scribing blade of the drill body hits the work material while rotating, the drilling part that sticks to the work material will position and support the drill body so that there is no displacement. .

Further, after the thread portion in the central protrusion of the drill body is screwed into the work material, the screw action of this thread portion produces a thrust force for advancing the drill body, and a punching work with a light force. It has the effect of being advanced.

[0013]

【Example】

 An embodiment of the woodworking machine of the present invention will be described below with reference to FIGS. 1 and 2, parts corresponding to those of the conventional example shown in FIGS. 3 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a side view of the tip side main part of the woodworking drill of this example in use, and FIG. 2 is a side view showing the tip side main part of the woodworking drill body in which 1 is the drill body. Is a cutting blade, 4 is a scribing blade, 6 is a chip groove, 7 is a workpiece, and 9 is a central projection.

The central protrusion 9 is a conical pyramid-shaped protrusion protruding from the center of the tip of the drill body 1, and a drill portion 10 such as a third, fourth or conical drill from the tip to the middle portion. Is formed, and the thread portion 11 is formed from the intermediate portion to the root end portion.

That is, the cutting tip length l, which is the length of the portion of the central protrusion 9 that protrudes from the tip of the marking blade 4, is formed to project more than half the outer diameter D of the marking blade 4. The woodwork drill of this example is used when the tilt angle of the drill body from the vertical line with respect to the surface of the workpiece 7 is up to 45 degrees, and when it is used at a tilt angle greater than this. In accordance with this, the drill tip length l is appropriately lengthened.

Next, a description will be given of the operation of the woodworking tool of the present example having the above-described structure when making a hole inclined with respect to the surface of the workpiece. First, the tip of the central projection 9 is pressed against the center position drawn in advance on the surface of the material 7 to be positioned.

Next, the drill body 1 is rotated by an electric drill body (not shown). Then, the drilling portion 10 rotates and bites into the workpiece 7 to support the positioning. Further, when the central protrusion 9 enters the workpiece 7, the thread 11 is screwed into the workpiece 7. At this time, even if the screw thread comes into contact with the surface of the workpiece 7 as the drill body rotates, the drill portion 10 stabbed in the workpiece 7 sufficiently positions and supports the drill body 1. The central protrusion 9 does not slip out of position.

Further, even when the scribing blade 4 comes into contact with the workpiece 7 due to the rotation of the drill body 1, the drill portion 10 stabbed therein sufficiently positions and supports the drill body 1, so that the drill body 1 Does not deviate from the desired positioning position, so that the desired position can be accurately drilled.

Further, when the one-bearing screw thread portion 11 is screwed into the workpiece 7, a thrust force for advancing the drill body 1 is generated by the action of the screw, and thereafter, the drill body 1 advances the drilling work with a light force. Can be turned on.

[0021]

[Effect of device]

 As described in detail above, according to the woodworking drill of the present invention, a central projection that is concentric with the drill main body is provided at the center of the tip of the drill body, and the tip side of this central projection is the third It is formed on a drilled part such as a drill, a four-milled drill, or a conical drill, and a thread is formed on the root end side part of the central protrusion, and the length of the part protruding from the scribing blade at the tip of the central protrusion Since it is configured to be longer than half the outer diameter of the scribing blade, when using this woodworking hole to make a hole that is inclined with respect to the surface of the work piece, Since the punch body is sufficiently pierced to position and hold the drill body at the desired position, when the drill body is rotated to cut through the hole, the thread portion of the central protrusion hits the work material and slides the drill portion. It is possible to prevent the position from changing, and moreover, the scribing blade of the drill body hits the workpiece while rotating. Kinimo, since tung portion was Toge' the workpiece is positioned and supported so as not to cause positional deviation tung body, there is an effect that it is possible to accurately drilled to a desired position.

In addition, after the thread portion in the central protrusion of the drill body is screwed into the work material, the screw action of this thread portion causes a thrust force to advance the drill body, and a punching operation with a light force. There is an effect that it can be advanced and the labor can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of an essential part of the tip of a drill main body in a drilling start state showing an embodiment of a wood drill of the present invention.

FIG. 2 is a side view showing the tip side main part of the woodworking drill body taken out.

FIG. 3 is a side view of a main part of a woodworking drill body, which illustrates a conventional woodworking drill with a lead screw, showing a main part on the front end side.

FIG. 4 is a side view of an essential part of the leading edge of the drill body of the conventional woodwork drill with a lead screw in a drilling start state.

FIG. 5 is an explanatory diagram for explaining the occurrence of a position error when a hole is formed in the workpiece with the above-mentioned conventional woodworking tool with a front thread, the hole being inclined with respect to the surface thereof.

FIG. 6 is a side view showing a main part on the tip end side, which illustrates a conventional woodworking tool with a central cone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drill main body 2 ... Lead screw 3 ... Cutting blade 4 ... Marking blade 5 ... Central cone 6 ... Chip groove 7 ... Workpiece material 8 ... Thread 9 ... Central protrusion 10 ... Drill 11 ... Thread

Claims (1)

[Scope of utility model registration request] 1. A center projection of the drill body, which is concentric with the axis of the drill body, is provided at the center of the tip of the drill body, and a tip side portion of the projecting portion is formed in the drill portion. A thread portion is formed on the end side portion, and the length of the extending portion protruding from the scribing blade at the tip of the drill body of the central projection is configured to be longer than half the outer diameter of the scribing blade. Woodworking drill to do.