JPH01140910A - Drill - Google Patents

Abstract

PURPOSE:To enable chips to be removed from the front side of a through hole, and thereby contrive to make it efficient to bore the through hole by forming a part of a drill protruding out of the back of a work piece into a cut-out shape at its appropriate position in such a way as to let chips dragged by the periphery section of the through hole on the back side be caught up when the drill is pulled out. CONSTITUTION:In using a drill 1, when the drill 1 is palled out while being rotated after the cut-out portion 11 of the drill has been protruded through on the back side of a through hole 3, the periphery section 6 of the through hole 3 on the back side is contracted in such a way that the circumference of the portion 11 of the drill 1 in a cut-out shape is bound. This causes thereby chips dragged by the periphery section 6 of the through hole 3 on the back side to be caught up by themselves by a chip catching section 9 along with the pull-out of the drill 1. And then, the chips are pulled out as they are caught up while being twisted to the pulling direction together with the drill 1 so as to be cut off from the periphery section 6 of the through hole on the back side for letting themselves be removed from the hole 3 on the front side of the hole 3.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a workpiece made of a rubber material with well-finished through holes (for example, water sprinkling holes, air blowing holes, etc.).
The present invention relates to a drill that makes it possible to drill a through hole (for example, a hole for threading a string).

(Prior Art and Problems to be Solved by the Invention) When a through hole is drilled in a workpiece made of a rubber material using a conventional drill, as shown in FIG. The chips C are connected to each other so as to protrude outward from the through hole a, or as shown in FIG. The continuous chips C were often drawn in when the drill was pulled out, and the through hole a was often blocked in the continuous state.

When the back side of the workpiece is in a state where post-processing can be performed, such as when the workpiece is a plate-shaped object, such chips C can be generated without considering the effort required for post-processing. It may be possible to remove it by post-processing, but if the workpiece is, for example, a snow melting hose base material as shown in FIG. In the case of drilling holes, if the workpiece is made of rubber, even if some of the chips that remain on the periphery of the back side of the watering hole can be removed by means such as pumping air into the hose. Because it is made of raw material, the continuous cuttings cannot be easily separated from the peripheral edge of the back side, and therefore most of the cough cuttings are not removed and are not cut off. 1al (as shown in bl), it will remain as it is. If the chips remain in this way, when water is fed into the snow melting hose, the chips will act as a lid and cover part of the watering hole. Otherwise, there is a problem that most of the holes tend to be closed, and therefore the amount of water sprayed from the water holes becomes small, making it impossible to exhibit an effective snow melting effect.

The present invention provides a drill that can solve the above-mentioned problems, based on which the removal of chips after drilling a through hole can be performed at the same time as the drill is being pulled out. This is the purpose.

(Means for solving the problems) A drill 1 according to the present invention has a workpiece 2 made of a rubber material.
This is used when drilling a through hole 3 in a workpiece 2, and by cutting out an appropriate part of the drill protrusion 5 that comes out to the back side of the workpiece 2, the back side periphery of the drilled through hole 3 is cut out. It is characterized in that a chip hooking portion 9 is formed for catching chips 7 connected to the portion 6 when the drill is pulled out.

(Function) When the drill 1 according to the present invention is used to drill a hole in the workpiece 2, and the notched portion 11 of the drill protrudes from the back side of the drilled through hole 3, Due to the elastic action of the workpiece 2 made of rubber material, the through hole 3
The back side peripheral edge portion 6 of the drill 1 contracts so as to tighten around the cutout portion 11 of the drill 1 (see FIG. 4). When the drill 1 is pulled out in this state, the chips 7 that are connected to the back side peripheral edge 6 of the through hole 3 are naturally caught on the chip hooking part 9 (the fifth (see figure), the hooked state is pulled in the pulling direction of the drill 1, separated from the back side peripheral portion 6 of the through hole 3, and removed from the through hole 3 on the front side of the through hole 3. becomes.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 5, the drill l of the present invention has a through hole 3 in a workpiece 2 made of a rubber material such as synthetic rubber or soft synthetic resin.
It is used when drilling holes (3rd to 5th
(see figure), a drill protrusion 5 that comes out from the back side of the workpiece 2
A chip hooking portion 9 is formed at an appropriate location for catching chips 7 connected to the back peripheral edge portion 6 of the drilled through hole 3 when the drill is pulled out. As shown in FIGS. 1 and 3 to 5, the chip catching portion 9 is formed by notching or recessing the opposing portion of the drill protrusion 5. When it is assumed that the drill 1 is in a vertical position, the chip catching portion 9 is connected to a cutting edge portion 10 (second
(see figure) is formed as a substantially horizontal step portion 9a continuous to the lower end. The operation when such a drill 1 is used is the same as that described in the "function section" above, and after the notch 11 of the drill is in a state protruding to the back side of the through hole 3 (see Fig. 3). (see Fig. 4), when the drill 1 is pulled out in a rotating state, the back side peripheral portion 6 of the through hole 3 contracts to tighten around the notched portion 11 of the drill l (see Fig. 4), so that the drill 1 is pulled out in a rotating state. The chips 7 that are connected to the back side peripheral edge 6 of the hole 3 are naturally caught in the chip hooking part 9 as the drill l is pulled out (see Fig. 5), and the chips 7 that are still stuck in the hole 3 are In this state, it is pulled together with the drill l in the drawing direction, and is separated from the back side peripheral portion 6 of the through hole, and is removed from the through hole 3 on the front side of the through hole 3.

Note that in this embodiment, the cutting edge portion 10 extending in the vertical direction
Since a cut-out portion 11 is formed at the lower end of the hole so that the chip hooking portion 9 is continuously provided, the cutting edge portion 10 is formed as shown in FIGS. 2 and 5 when drilling a through hole. As shown in FIG. Therefore, the required through-hole 3 with a smoother inner peripheral surface 12 and a better finish is formed (see FIG. 6). For example, when the drill l according to the present invention is used to drill through holes 3 as water sprinkling holes 3a in a workpiece 2 as a snow melting hose base material 2a as shown in FIG. .
As shown in the figure, each watering hole 3a of the snow melting hose 13...
Water gushes out in a uniform manner, creating an effective snow-melting effect. In FIG. 8, reference numeral 15 is a plug that closes one end of the snow melting hose 13.

FIG. 9 shows another embodiment of the drill l according to the present invention, in which the chip catching portion 9 is formed as an inclined stepped portion 9b whose tip is inclined outwardly and slightly upwardly. has been done. Further, FIG. 10 shows a case where, for example, a plurality of stages (two stages in FIG. 10) of chip hooking portions 9 similar to those shown in FIG. 1 are provided on the drill protrusion 5. Note that the chip catching portion 9 formed in the drill 1 according to the present invention is
The shape is not limited to that shown in the embodiments described above, but depending on the material of the target workpiece 2, the diameter of the through hole to be drilled, etc., when the drill is pulled out, the back side of the through hole. The chips 7 that are connected to the peripheral edge portion 6 can be caught by the chip hooking portion 9 without any trouble, and the caught chips 7 can be removed together with the drill 1 on the front side of the through hole 3. It is sufficient if it is configured as follows.

(Effects of the Invention) The drill according to the present invention solves the problems described above when using a conventional drill, which occurs because the drill is aimed at a workpiece made of a rubbery material. By making the most effective use of the characteristics that result from this, namely, that no force is applied to the drill when drilling the through-hole, and that the through-hole part can elastically expand and contract appropriately,
This is something that will be resolved brotherly.

A more specific explanation of this is as follows.

That is, the drill according to the present invention has a structure in which a chip-catching part is provided at an appropriate part of the drill protrusion that comes out from the back side of a workpiece made of a rubber material, and as a result, the drill can be pulled out after drilling a through hole. At this time, the chips that are connected to the back side periphery of the through hole are reliably caught in the chip catching part because the back side periphery of the through hole contracts so as to tighten around the notched part of the drill. The drill is then twisted and pulled together with the drill in the drawing direction in the hooked state, and is separated from the peripheral edge of the back side of the through hole and removed from the front side of the through hole. This is completely different from using a drill, and when drilling through-holes such as water or air ejection holes or string holes in workpieces made of rubber materials, it is possible to ensure that the through-holes have a good finish. can be drilled into the Moreover, since the chips that are connected to the peripheral edge of the back side of the through hole can be removed at the same time as the drill is pulled out after drilling the through hole, it is possible to perform chip control on the back side of the workpiece. Even if possible, it does not require post-processing for chip removal, as is the case when using a conventional drill, and therefore it is suitable for drilling through-holes when processing workpieces made of rubbery materials. This is expected to improve work efficiency.

Incidentally, providing a drill with a notched portion is a completely unconventional idea because it will easily cause the drill to break when drilling a through hole, but the drill according to the present invention Since the target is not a workpiece but a soft workpiece made of a rubber material, no strain is applied to the drill, and there is almost no risk of the drill breaking.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a drill according to the present invention;
Figure 2 is an enlarged end view of section A-A in Figure 1, and sections 3 to 5.
The figure is a front view explaining the operation of the drill according to the present invention, and
Fig. 7 is a cross-sectional view showing a through hole formed by the drill of the present invention, Fig. 7 is a perspective view showing a workpiece as a base material for a snow melting hose together with the through hole, and Fig. 8 is a perspective view showing the state in which the snow melting hose is used. Figures 9 and 10 are front views showing other embodiments of the present invention, Figures 11 and 12 are perspective views showing the state of through holes drilled using a conventional drill; (in Fig. 11) and Fig. 12 (bl is a cross-sectional view thereof. 1...Drill, 2...Workpiece, 3...Through hole, 5
...Drill protrusion, 6...Back side peripheral edge of the through hole, 7
...Chip, 9...Chip catching part. Patent applicant Daiken Kasei Kogyo Co., Ltd. Agent Patent attorney Kiyoshi Okamoto Figure 3 Figure 2 Figure 9 Figure 10 Figure 11 (1)) a

Claims (1)

[Claims] This drill is used to drill a through hole 3 in a workpiece 2 made of a rubber material, and the drill protrusion 5, which comes out from the back side of the workpiece 2, is cut out at an appropriate part, so that the hole can be drilled. A drill characterized in that a chip hooking part 9 is formed for catching chips 7 connected to the back side peripheral edge part 6 of the through hole 3 when the drill is pulled out.