JP3141314U - Drill with centering function - Google Patents

Abstract

An attachment having a centering function can be easily attached to and detached from a drill body by one touch.
A drill that can be connected to a rotating shaft of an electric rotary tool 85 such as an electric screwdriver drill on the root side or to a driver bit 80 attached to the rotating shaft, and has a centering function. A connecting portion 11 is provided on the base side of the drill body portion 10, and a drill bit 12 is fixed to the distal end side of the connecting portion 11. An attachment 20 having a centering function can be detachably fixed to the connecting portion 11 of the drill body 10. A male screw portion 16 is formed on the distal end side of the connecting portion 11, and a female screw portion that is screwed with the male screw portion 16 is formed on the base portion 27 side of the attachment 20, and both are screwed together and fixed.
[Selection] Figure 1

Description

The present invention relates to a drill that can be directly attached to the rotary shaft of an electric rotary tool such as an electric screwdriver or drill, or a drill that can be connected to the tip of a hexagonal screwdriver bit attached to the rotary shaft of an electric rotary tool. It is.
More specifically, according to the present invention, when the pilot hole is formed before the hinge or the handrail bracket is fixed with the screw, the pilot hole is drilled at the center position of the screw insertion hole of the hinge or the bracket. Therefore, the present invention relates to a drill added with a centering function.

Conventionally, there is a drill attachment described in Patent Document 1 below, and a bit connector described in Patent Document 2 below.
FIG. 7 shows the drill bit fixed to the tip of the bit connector, and the attachment connected to the drill bit and fixed, and this is fixed to the driver bit attached to the electric rotary tool. It is explanatory drawing which shows a state.
As shown in FIG. 7, the conventional drill attachment 50 can be attached and fixed by tightening a small screw 62 with a hexagonal wrench on a shaft portion 61 of a drill bit 60 fixed to a tip portion of a drill body 81. is there.
For example, it was developed for use in drilling a pilot hole through a screw insertion hole 71 of a thick article to be fastened such as a handrail bracket 70 or the like, and its function is to drill a pilot hole. This is intended to provide a centering function for use.

As can be seen from FIG. 7, the attachment 50 is fixed to the shaft portion 61 of the drill bit 60 at the tip of the drill body 81 attached to the tip of the driver bit 80 of the electric rotary tool by tightening a machine screw 62 with a hexagonal shaft wrench. To do. Then, the tip guide portion 51 of the attachment 50 is fitted into the screw insertion hole 71 of the handrail bracket 70. In this state, the coil spring 52 is contracted by applying a force in the drill tip direction while operating the electric rotary tool, and a pilot hole for screw tightening is drilled.
Due to the presence of the tip guide portion 51, the pilot hole is provided at a substantially central position of the screw insertion hole 71.
In FIG. 7, reference numeral 82 denotes a tightening small screw, and these small screws 82 and 82 are also tightened by a hexagonal axis wrench, and the drill bit 60 is fixed to the tip of the drill body 81.
Design Registration No. 1269188 JP 2003-266324 A

The present invention relates to a drill with a centering function in which an attachment having the centering function and a drill are combined. In the conventional attachment, when attaching the drill, the machine screw is tightened to attach the attachment to the shaft portion of the drill bit. It was a translation that was fixed. When tightening, a tool such as a hexagonal axis wrench whose tip is bent at a substantially right angle with a hexagonal axis is usually used.
However, the attachment having the centering function is not always used, and as described above, it is used when forming the prepared hole when fixing a hinge or various brackets, This is unnecessary when forming the hole, and conversely, when forming a simple hole, the tip of the drill is hidden by the attachment, making it difficult to use.

Therefore, in a normal drilling operation, this attachment is removed. Moreover, in the normal case, there are many cases where this attachment is not used in the frequency of use of the drill.
Therefore, it is necessary to attach and detach this attachment. However, as described above, a tool such as a hexagonal axis wrench must be used for the attachment and detachment, and it was not easy to attach and detach with one touch. Many carpenters prepared two types of drills, one with attachments and one without attachments.

Furthermore, when attaching large hinges or brackets as described above, a long screw is used when fixing large hinges or brackets. In order to do so, you must drill a pilot hole, then remove the attachment, and drill a deeper pilot hole. To do so, loosen the attachment with a tool such as a hexagonal wrench. It will take the trouble of having to remove.
Therefore, since it is troublesome to attach and detach the attachment at present, we prepare two drills, one with attachments and the other without attachments, and replace them to make pilot holes for longer screws. .

Therefore, an object of the present invention is to enable an attachment having a centering function to be easily fixed to and removed from the drill body with one touch.
Alternatively, it is an object of the present invention to realize two kinds of usage purposes by allowing an attachment having a centering function to be easily added to a drill for preparing a lower hole.
As described above, there has been a drill having this centering function in the past, but a small screw is used to attach and detach the attachment for demonstrating the centering function to the drill body. Was fixed and removed with a tool.

Such a fixing method is also used when, for example, a drill bit is fixed to a connecting portion on the base side of the drill, that is, already used in a technical field such as a drill used in the electric drill. In this field, the technique of tightening and fixing a small screw with a tool has been used or fixed in this field.
In the present invention, apart from the technical ideas that have been used and fixed for a long time, it came to mind after many years of struggling to find another simpler fixing means.

  In order to solve the above-mentioned problem, the first one of the present invention is a connecting portion that can be connected to a rotating shaft of an electric rotary tool such as an electric screwdriver / drill or a driver bit attached to the rotating shaft on the root side. A drill body with a centering function comprising a drill body portion having a drill bit fixed to the tip of the connecting portion and an attachment having a centering function that can be detachably fixed to the tip side of the drill body portion. A centering function characterized in that a male screw part is formed on the distal end side of the connecting part, a female screw part screwed with the male screw part is formed on the base part side of the attachment, and both can be screwed together and fixed. It is a drill.

  The second device of the present invention has a connecting portion that can be connected to a rotating shaft of an electric rotary tool such as an electric screwdriver / drill or a driver bit attached to the rotating shaft on the base side, In a drill with a centering function consisting of a drill body with a drill bit fixed to the tip and an attachment having a centering function that can be detachably fixed to the tip of the drill body, An annular recess is formed, and a stopper sphere that can be freely projected and retracted is disposed in an engagement hole formed in the base of the attachment, and an annular elastic member that presses the stopper sphere in the axial direction is arranged on the outer periphery of the base of the attachment. By disposing the tip of the connecting portion of the drill body in the engaging hole of the attachment root, By wrapper for the sphere is engaged in the annular recess of the connecting portion, a centering function drill, characterized in that the attachment is connected and fixed to the connecting portion.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the base side of the connecting portion of the drill body is formed from a hexagonal axis having a hexagonal cross section, and an annular recess is provided at an appropriate position on the base side. A drill with a centering function, wherein the drill can be directly connected to a rotating shaft of an electric rotary tool.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, an engagement hole portion having a hexagonal cross section is formed in the longitudinal direction from the base side end surface of the connecting portion of the drill body portion. A stopper sphere that can be moved in and out is provided in the section, and the stopper sphere can be moved in and out in the engagement hole by the movement of the reciprocating sliding cylinder that is urged in the longitudinal direction on the outer periphery of the connecting portion. With the centering function, the stopper sphere is connected and fixed to the driver bit by engaging with an annular recess formed on the outer periphery of the hexagonal screwdriver bit mounted on the electric rotary tool. It is a drill.

In the first device of the present invention, the male screw portion at the tip of the connecting portion of the drill main body portion and the female screw portion at the base portion of the attachment can be simply screwed together and removed.
Further, since the drill according to the present invention is attached to an electric rotary tool such as an electric screwdriver / drill, the tool is provided by attaching the drill main body according to the present invention to the electric rotary tool. The attachment according to the present invention can be screwed or removed in only about 1 second by rotating the drill body part forward or backward by merely turning on the switch.
Therefore, there is no need to use a tool such as a hexagonal axis wrench to attach and detach the attachment as in the prior art.

  Also in the second device of the present invention, as in the first device described above, the retractable stopper sphere provided in the engagement hole formed in the base portion of the attachment is provided with the connecting portion of the drill body portion. By engaging and fixing with the annular recess formed on the outer peripheral surface of the tip, the attachment is engaged and fixed to the connecting portion of the drill main body by one touch.

  In the third aspect of the present invention, since the connecting portion of the drill body is formed from a hexagonal shaft having a hexagonal cross section and an annular recess, the one-touch connecting rotary shaft of the electric rotary tool is used. Can be directly linked.

  In the fourth one of the present invention, due to the configuration of the connecting portion of the drill body portion, the engaging hole portion of the connecting portion is engaged with a hexagonal screwdriver bit mounted on the electric rotary tool in one touch, Will be linked.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory diagram illustrating a first embodiment of the present invention, in which a drill according to the present invention is separated and an electric screwdriver drill equipped with a driver bit is illustrated.
The drill according to the present invention includes a drill body 10 and an attachment 20 having a centering function.

The drill body 10 includes a base-side connecting portion 11 and a tip-side drill bit 12, and a base-side shaft portion 12 r of the drill bit 12 is inserted through the shaft core at the tip portion of the connecting portion 11. It is inserted into the hole and fixed with a machine screw 14. The machine screw 14 is tightened by a tool such as a hexagonal axis wrench to fix the drill bit 12 to the connecting portion 11.
And the most characteristic part of this invention is the external thread part 16 formed in the outer periphery of the front-end | tip part of the connection part 11. FIG. The outer diameter of the male screw portion 16 is smaller than the outer diameter of the distal end portion 17 of the connecting portion 11. Therefore, a step portion 18 is formed on the right end side of the male screw portion 16 in the drawing.

On the other hand, the attachment 20 having a centering function is composed of a root portion 27 on the root side, a tip guide portion 21 on the tip side, and a coil spring 25 that couples both.
Through-holes 22 are provided in the shaft core portions of both the tip guide portion 21 and the root portion 27, and the drill bit 12 of the drill main body portion 10 is inserted into these through-holes 22.
Although not shown in the figure, a hole is formed in the distal direction from the root-side end surface of the root portion 27, and a female screw portion is formed on the inner peripheral surface of the hole portion (see FIG. 2 later). Explain).
The female screw portion is screwed to the male screw portion 16 of the drill main body portion 10.

When the male screw portion 16 and the female screw portion are screwed together, the drill main body portion 10 and the attachment 20 are connected and fixed, and the outer diameters of the distal end portion 17 of the connecting portion 11 and the root portion 27 of the attachment 20 are substantially approximately. They are formed to be the same.
In this way, with the drill body 10 and the attachment 20 connected and fixed, they are connected and fixed to the tip 86 of the hexagonal screwdriver bit 80 attached to the rotating shaft of the electric screwdriver drill 85 with one touch. It is done.

More specifically, the sliding cylinder 11s can always be urged forward (rearward in the drawing) by an internal coil spring to reciprocate on the outer periphery on the base side of the connecting portion 11, and the base of the connecting portion 11 can be reciprocated. The stopper steel balls appearing and retracting in the engaging hole formed on the side are configured so as to be able to appear and retract in the engaging hole in accordance with the movement of the sliding cylinder 11s.
Accordingly, the sliding cylinder 11s is moved in the fundamental direction (rightward in the figure) so that the stopper steel ball can be retracted from the engagement hole, and the electric screwdriver drill 85 is inserted into the engagement hole. When the tip of the driver bit 80 is inserted and the steel ball for stopper engages with the annular recess 87 formed on the outer peripheral surface of the tip of the driver bit 80, the sliding cylinder 11s returns to the original position. The drill body 10 is fixed to the driver bit 80 and attached. This configuration is the same as the conventional one (Patent Document 2).

FIG. 2 is a longitudinal sectional view of the attachment 20.
The attachment 20 includes a root portion 27, a tip guide portion 21, and a coil spring 25 that connects them. A through hole 22 is formed in the shaft core portion of the tip guide portion 21 and the root portion 27, and a hole portion 23 having an inner diameter larger than the through hole 22 is formed on the root side of the root portion 27. A female thread portion 26 is formed on the inner peripheral surface of the inner thread.
The male screw portion 16 of the drill main body portion 10 is screwed into the female screw portion 26.

In this way, with the male screw portion 16 and the female screw portion 26 screwed together, the drill body portion 10 and the attachment 20 are connected and fixed, the drill according to the present invention is attached to the driver bit of the electric rotary tool. FIG. 3 is an explanatory diagram illustrating the use state.
When the distal end guide portion 21 of the attachment 20 according to the present invention is brought into contact with the screw insertion holes 71 of various brackets 70 and pressed in the distal direction to contract the coil spring 25, the driver on the distal end side of the drill main body portion 10 is The tip of the bit 12 appears, and a pilot hole can be drilled at the center position of the screw insertion hole 71.

FIG. 4 is an exploded view illustrating a second embodiment of the drill according to the present invention.
This 2nd Embodiment differs in the shape of the base part side of the connection part 11 of the said 1st Embodiment and the drill main-body part 30. As shown in FIG.
The root portion 11r of the connecting portion 11 of the drill main body 30 has a hexagonal cross-sectional shape, and can be directly connected to a rotating shaft such as an electric screwdriver or a drill.
There are various types of connecting structures for the rotary shaft of the electric rotary tool. In consideration of a chuck type or a type that can be connected in a one-touch manner, an annular recess 11c is provided on the outer peripheral surface of the root portion 11r. .
Other configurations are the same as those in the first embodiment.
The drill main body 30 is connected and fixed by the male screw portion 16 formed on the distal end side of the connecting portion 11 being screwed into the female screw portion formed on the root portion 27 of the attachment 20.

FIG. 5 is an exploded explanatory view illustrating a third embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of an attachment according to the third embodiment of the present invention.
In the third embodiment, the drill body 35 and the attachment 36 are not coupled by a screw but coupled by engagement between a stopper sphere (steel ball) and an annular recess.
The drill main body portion 35 is different from the first embodiment in the configuration on the distal end side of the connecting portion 11.
That is, there is no male screw portion at the tip portion, and a narrow diameter portion 11h is formed at the tip portion, and an annular recess 37 is formed on the outer peripheral surface of the narrow diameter portion 11h.

On the other hand, the attachment 36 has the same configuration as that of the above embodiment in the configuration including the root portion 28, the tip guide portion 21, and the coil spring 25 that connects both, but the configuration of the root portion 28 is different.
That is, as clearly understood from FIG. 6, the root portion 28 has an engagement hole portion 38 formed in the shaft core portion, and in the engagement hole portion 38, the connecting portion of the drill main body portion 35 is formed. 11 small diameter portions 11h can be fitted.

The wall surface of the engagement hole portion 38 of the root portion 28 is provided with a retractable stopper sphere (steel ball) 39, and an annular elastic member 40 is provided at the root so as to press the outside of the stopper sphere 39. It is arranged on the outer periphery of the portion 28.
Accordingly, the stopper sphere 39 can move outward when a force is applied radially outward from the axial center by the elastic force of the elastic member 40, and can move inward when the force is removed. .

With such a configuration, when the small diameter portion 11h of the drill main body 35 is inserted into the engagement hole 38 of the attachment 36, the stopper sphere 39 moves outward in the radial direction and the insertion is performed. In other words, when the stopper sphere 39 is engaged with the annular recess 37, the attachment 36 is fixed to the drill body 35.
In this way, the attachment 36 can be connected to the drill body 35 and can be connected and fixed with one touch.
In the third embodiment, the connecting portion 11 of the drill main body 35 can naturally be formed in a hexagonal cross section as in the second embodiment.

Although the embodiment has been described above, various design changes can be made in the present invention as follows.
Various dimensions and the like of the drill body and the attachment can be appropriately designed as necessary.
The length in the longitudinal direction in which the male screw portion and the female screw portion are provided can also be set as necessary.
In addition to the above-described embodiment, the base part of the connecting part of the drill main body may be of any type that can be fixed to the rotating shaft of the electric rotary tool.

The outer diameter of the blade of the drill bit fixed to the distal end side of the connecting portion can also be selected and changed as necessary.
In the third embodiment, the drill body and the attachment are configured so that they can be connected with one touch, and the narrow diameter part at the tip of the connecting part is formed in a columnar shape, but this outer diameter is in a hexagonal column shape. You can also.
In that case, the engagement hole formed in the base portion of the attachment also needs to have a hexagonal cross section.
In the third embodiment, only one stopper sphere is used. However, two or more stopper spheres may be used.

In each of the above-described embodiments, in the first and second embodiments, a stepped portion 18 is formed on the base side of the male screw portion 16 on the distal end side of the connecting portion, and in the third embodiment also the connecting portion. Steps are also formed on the base side of the narrow-diameter portion on the distal end side, but it is optional to provide these steps, and it is possible to carry out without providing them.
That is, by forming this stepped portion, the outer diameter of the base of the attachment and the outer diameter of the tip of the connecting portion are formed to be the same in design, but the attachment is attached to the connecting portion. Even when a step appears at the connection boundary when connected, no functional problem occurs, and it is naturally possible to implement in such a form.

Finally, in the present invention, when the attachment is fixed to the drill body, the attachment itself rotates as the drill body rotates. Since the coil spring that connects the two is connected to the root portion, the tip guide portion, and the loose portion, the tip guide portion does not rotate even if the root portion rotates. That is, the root portion rotates together with the drill body portion, but the tip guide portion does not rotate together with the drill body portion, so that the male screw portion and the female screw portion are screwed together as in the first embodiment. There is no problem even in the coupling by.
As described above, the present invention can provide a drill with a centering function capable of easily connecting and fixing an attachment having a centering function to the drill body without using any tightening tool with a simple configuration. It was.

1 is an exploded explanatory view illustrating a first embodiment of the present invention. It is a longitudinal cross-sectional view of the attachment which concerns on the 1st Embodiment of this invention. It is explanatory drawing which illustrates the use condition of the 1st Embodiment of this invention. FIG. 5 is an exploded explanatory view illustrating a second embodiment of the present invention. FIG. 6 is an exploded explanatory view illustrating a third embodiment of the present invention. It is a longitudinal cross-sectional view of the attachment which concerns on the 3rd Embodiment of this invention. It is explanatory drawing of the use condition of the conventional drill with a centering function.

Explanation of symbols

10, 30, 35 Drill body part 11 Connecting part 11r Root part 11s Sliding cylinder 11h Small diameter part 12 Drill bit 16 Male thread part
20, 36 Attachment 21 Tip guide part 22 Through hole 26 Female thread part 25 Coil springs 27, 28 Root part 37 Annular recess 38 Engagement hole part 39 Stopper sphere 40 Elastic member

Claims (4)

There is a connecting part that can be connected to the rotating shaft of the electric rotary tool (85) such as an electric screwdriver / drill or the driver bit (80) attached to the rotating shaft on the base side, and the drill is at the tip of the connecting part In a drill with a centering function consisting of a drill body part with a bit fixed and an attachment having a centering function that can be detachably fixed to the tip side of the drill body part,
A female threaded portion (16) is formed on the distal end side of the connecting portion (11) of the drill body portion (10, 30), and a female threadedly engaged with the male threaded portion (16) is formed on the base portion side of the attachment (20). A drill with a centering function, wherein a screw part (26) is formed and both can be screwed together and fixed. There is a connecting part that can be connected to the rotating shaft of the electric rotary tool (85) such as an electric screwdriver / drill or the driver bit (80) attached to the rotating shaft on the base side, and the drill is at the tip of the connecting part In a drill with a centering function consisting of a drill body part with a bit fixed and an attachment having a centering function that can be detachably fixed to the tip side of the drill body part,
An annular recess (37) is formed on the outer peripheral surface of the distal end of the connecting portion (11) of the drill body portion (35), and can be freely moved into and out of an engagement hole portion (38) formed at the base portion of the attachment (36). The stopper sphere (39) is provided, and an annular elastic member (40) that presses the stopper sphere (39) in the axial direction is provided on the outer peripheral surface of the base portion of the attachment (36), whereby the attachment (36 ) By fitting the tip of the connecting portion (11) of the drill body (35) into the engaging hole (38) of the root portion, the stopper sphere (39) is connected to the annular recess ( 37. A drill with a centering function, wherein the attachment (36) is connected and fixed to the connecting portion (11) by engaging with 37).   The connecting part (11) of the drill body (30) is formed on the base side from a hexagonal shaft with a hexagonal cross section, and an annular recess (11c) is provided at an appropriate position on the base side so that it can be directly connected to the rotating shaft of the electric rotary tool. The drill with a centering function according to claim 1 or 2.   An engagement hole having a hexagonal cross section in the longitudinal direction is formed in the longitudinal direction from the base side end face of the connecting portion (11) of the drill body (10, 35). The stopper sphere can be moved into and out of the engagement hole by the movement of the reciprocating sliding cylinder (11s) that is urged in the longitudinal direction on the outer periphery of the connecting portion, and the stopper sphere is electrically rotated. It is connected and fixed to the driver bit (80) by engaging with an annular recess (87) formed on the outer periphery of the hexagonal screwdriver bit (80) mounted on the tool (85). The drill with a centering function according to claim 1 or 2.

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