JP2002001682A - Attachment for portable electric drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably support an attachment for high point drilling of a portable electric drill. SOLUTION: The attachment is constituted of a sleeve 1 made of a head end sleeve 1a and a base part sleeve 1b and an extension shaft 2 inserted through in the sleeve 1 free to rotate, a bearing 5 to support the extension shaft 2 is provided on the base part sleeve 1b, a stopper 3 for fall-stop of the sleeve is fixed on the extension shaft 2, a chuck 4 for tool mounting is mounted on its head end, a grip 6 is provided to a head end of the base part sleeve 1b, a cutting chip receiver 7 is fitted on a head end part of the head end sleeve 1a free to slide, and a compression coil spring 9 is fitted between a lower part spring receiver 8a provided on the head end sleeve 1a and the cutting chip receiver 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment used for an existing portable electric drill and for attaching a drill bit at a position away from a main body. In this specification, a drill bit is used to include a cutting tool for making a large-diameter hole, such as a hole saw.

[0002]

2. Description of the Related Art Work using a portable electric drill is generally performed by:
An orthodox work method is to hold the grip provided with the switch with the right hand, support the main body with the left hand, and operate the switch provided on the grip with the right hand. So, for example,
When drilling on the ceiling surface, it is necessary to work on a stepladder, and when drilling on the floor surface, it is necessary to bend and work. Working on a stepladder is dangerous from a stability perspective.
When moving the work site, the user once gets off the stepladder, moves on the stepladder, and then climbs on the stepladder, which is inefficient and increases the operator's fatigue. In addition, since the work performed while bending also places a burden on the feet and hips, the fatigue of the worker also increases.

Therefore, various devices have been proposed to reduce the fatigue of workers. For example, there is a type in which a pipe shaft is inserted in a pole, a portable electric drill is attached to a tip of the pipe shaft, and the pipe shaft is moved up and down using a gear mechanism (Japanese Patent Laid-Open No. 7-19).
No. 6136). In some cases, an extension portion called a neck is provided between the power switch portion and the operation body portion, and the neck and the operation portion body are connected by a joint (utility model registration No. 30).
26286). There is provided a shaft portion and a handle portion provided on an upper portion thereof, and a lower end portion of the shaft portion provided with a connecting portion for detachably connecting a portable electric drill (see Japanese Patent Application Laid-Open No. 8-47875). .

[0004] In order to reduce the fatigue of the operator, these proposals have been proposed to attach the portable electric drill body to the end of the attachment as viewed from the operator. In contrast, the portable electric drill body is attached to the worker as viewed from the attachment, with the extension shaft attached to the chuck of the portable electric drill body and the drill blade attached to the tip of the extension shaft. (See Japanese Utility Model Laid-Open No. 4-86109).

[0005]

When the portable electric drill body is attached to the end of the attachment as viewed from the operator, for example, the danger of using a stepladder and the fatigue of climbing and descending can be avoided, and the working efficiency can be improved accordingly. However, the portable electric drill body is heavy although it is small, and it is not easy to support the electric drill with an arm. In addition, even if the portable electric drill body is mounted closer to the worker as viewed from the attachment, the center of gravity is on the worker side, but the long one must be held only at the end. The support tends to be unstable, and the extension shaft may bend due to the weight of the chuck attached to the tip. If the extension shaft rod is rotated in the bent state, the chuck may swing. There is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an attachment in which a portable electric drill body is attached to an operator using an extension shaft, which can stably support and does not swing the chuck. I do.

A second object of the present invention is to provide an attachment which makes the rotation of the extension shaft smooth in addition to the object of the first invention.

A third object of the present invention is to provide an attachment capable of stabilizing a stance during operation, in addition to the object of the second aspect of the present invention.

A fourth object of the present invention is to provide an attachment which does not scatter cutting chips when drilling holes on a ceiling surface or the like, in addition to the object of the third aspect of the present invention.

[0010]

The invention according to claim 1 comprises a sleeve 1 and an extension shaft 2 rotatably inserted into the sleeve 1. The extension shaft 2 is provided with the sleeve. This is an attachment for a portable electric drill in which a stopper 3 for retaining is fixed and a chuck 4 for attaching a tool is attached to a tip of the stopper 3.

Further, according to a second aspect of the present invention, the sleeve 1 comprises:
A portable electric drill attachment comprising a distal sleeve 1a and a base sleeve 1b, and having a bearing 5 for supporting the extension shaft 2 on the base sleeve 1b.

Further, the invention of claim 3 provides the base sleeve 1
6B is an attachment for a portable electric drill in which a grip 6 is provided in FIG.

[0013] Further, the invention according to claim 4 is characterized in that the tip sleeve 1
a cutting chip receiver 7 is slidably fitted to the distal end of the cutting sleeve 7a.
And an attachment for a portable electric drill in which a compression coil spring 9 is fitted in between.

[0014]

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

FIG. 1A is a front view of an attachment (hereinafter simply referred to as an attachment) for a portable electric drill according to an embodiment of the present invention.
04 is shown.

Hereinafter, an attachment designed so as to be suitable for making a hole in a ceiling surface having a height of 2400 mm from the floor surface will be described.

In such a case, the extension shaft 2 is made of S4 having a diameter of 10 mm and a length of 820 mm.
5C material is preferably used.

Next, the sleeve 1 includes a distal sleeve 1a and a base sleeve 1b. When using the S45C material having a diameter of 10 mm as the extension shaft 2,
As the tip sleeve 1a, an aluminum tube having an outer diameter of 16 mm and 14 mm is preferably used. Further, as the base sleeve 1b, one in which an aluminum tube having an outer diameter of 22 mm and an inner diameter of 16 mm and an aluminum tube having an outer diameter of 16 mm and 14 mm are preferably used.

The distal sleeve 1a and the base sleeve 1b are connected by a bearing sleeve 5a. Further, in the base sleeve 1b, the outer diameter is 22 mm and the inner diameter is 1 mm.
The 6 mm aluminum tube and the 16 mm and 14 mm outer diameter aluminum tubes are connected by a bearing sleeve 5b. A bearing sleeve 5c is fitted on the base end side of the base sleeve 1b. The bearing sleeves 5a, 5b, 5c are provided with bearings 5, 5, 5 for supporting the extension shaft 2, as shown in FIG. Further, a fluororesin lining bush containing a lubricant having an inner diameter of 12 mm is fitted on the distal end side of the distal end sleeve 1a (on the opposite side to the base sleeve 1b side). Also, extension shaft 2
A stopper 3 for preventing the sleeve 1 from coming off is attached to the base side, and a stop ring (not shown) is attached to the tip of the extension shaft 2 at a position slightly closer to the base. And the extension shaft 2 are regulated. As the bearing 5, a ball bearing is preferable. The shape of the stopper 3 for retaining is made convex in cross section as shown in FIG. 1 (c), and the convex portion comes into contact with the inner race of the bearing 5 and rotates to reduce the friction of the stopper 3 for retaining. Can be eliminated.

Further, a grip 6 is provided integrally with the base sleeve 1b. The grip 6 is preferably made of aluminum and has a shape and a size that can be easily grasped by one hand (usually a left hand).

A chuck 4 for holding a tool is attached to the tip of the extension shaft 2 so that a tool, for example, a shank of a hole saw 104 can be used for use.

A cutting chip receiver 7 is slidably fitted to the tip of the tip sleeve 1a, and a compression coil spring 9 is fitted between the lower spring receiver 8a provided on the tip sleeve 1a and the cutting chip receiver 7. To support the cutting waste 7. The cutting waste 7 is, for example, 2 mm thick and 48 mm in inner diameter.
It is preferable to use a cup-shaped polypropylene. Further, an upper spring receiver 8a is attached to the tip of the sleeve 1, thereby regulating the position of the cutting waste receiver 7.

The tool holding chuck 4 attached to the tip of the extension shaft 2 includes an inner cylinder 110, an outer cylinder 120, and a holding pin 130. The inner cylinder 110 has a male screw 111 on the tip end side and a base A holding pin insertion hole 112 is formed near the end, and the outer cylinder 120 is formed.
Is a male screw 111 formed in the inner cylinder 110 on the tip side.
A female screw 121 is formed so as to mesh with the tapered surface 12, the inner surface of which is closer to the proximal end than the female screw 121.
2 (see FIG. 2) is preferably used.
This is because it is possible to reduce the size and weight of the cutting waste receiver 7. As the chuck 4 for holding a tool attached to the tip of the extension shaft 2, a chuck for a portable electric drill can be used.

In the attachment described above, the base end of the extension shaft 2 is attached to the chuck 10 of the portable electric drill 100.
The user holds the grip 102 of the portable electric drill 100 with the right hand, holds the grip 6 of the attachment with the left hand, presses the edge of the cutting waste receiver 7 against the ceiling surface, and operates the switch 103. Then, when the switch 103 is turned on and a force is applied in a direction to advance the hole saw 104, the compression coil spring 9 is pressed and compressed by the spring receiver 8a as the drilling by the hole saw 104 progresses, and the hole saw is advanced as the drilling progresses. 10
4 can be advanced.

Further, using the attachment of the present invention,
When drilling in a narrow place, it is also possible to use the machine with the cutting chip receiver 7 removed.

As described above, as the base sleeve 1b, the outer diameter 2
2mm, 16mm inner diameter aluminum tube and 16m outer diameter
m, an aluminum tube having a diameter of 14 mm was connected. However, as shown in FIG. 3, an aluminum tube having an outer diameter of 22 mm was used without using an aluminum tube having an outer diameter of 16 mm and 14 mm.
It can also be constituted by one aluminum tube having an inner diameter of 16 mm. By doing so, the number of parts can be reduced, so that the cost can be reduced.

Since the stopper 3 for retaining and the chuck 101 of the portable electric drill 100 rotate at high speed, there is a possibility that the sleeve of the clothes may be caught. In such a case, a safety cover 10 as shown in FIG. 3 can be attached to the base sleeve 1b.

[0028]

According to the first aspect of the present invention, for example, the portable electric drill body can be operated with the dominant hand (right hand) and the attachment can be operated with the opposite hand (left hand), so that stable support can be achieved. it can. Further, since the extension shaft is regulated by the sleeve, no swing occurs.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the rotation of the extension shaft can be made smooth.

According to the third aspect of the present invention, the second aspect is provided.
In addition to the effects of the invention described above, the attitude during operation can be further stabilized.

Further, according to the invention of claim 4, in addition to the effect of the invention of claim 3, when drilling a hole on a ceiling surface or the like, the edge of the cutting chip receiver is brought into close contact with the ceiling surface to perform the operation. Cutting chips are not scattered. Therefore,
Work efficiency can be improved.

[Brief description of the drawings]

FIG. 1A is an attachment for a portable electric drill according to an embodiment of the present invention (hereinafter simply referred to as an attachment).
(B) is a cross-sectional view of a main part of (a), (c)
Is a partially enlarged sectional view thereof.

FIG. 2 is a partially sectional view showing an example of a chuck for holding a tool.

FIG. 3 is a front view of an attachment for a portable electric drill according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sleeve 1a Tip sleeve 1b Base sleeve 2 Extension shaft 3 Stopper stopper 4 Tool mounting chuck 5 Bearing 6 Grip 7 Cutting waste receiving 8b Lower spring receiving 8a Upper spring receiving 9 Compression coil spring

Claims (4)

[Claims] 1. A sleeve, and an extension shaft rotatably inserted into the sleeve. A stopper for retaining the sleeve is fixed to the extension shaft, and a chuck for attaching a tool is attached to the tip of the stopper. Attachment for portable electric drill with attached. 2. The portable electric drill attachment according to claim 1, wherein the sleeve comprises a distal sleeve and a base sleeve, and the base sleeve is provided with a bearing for supporting the extension shaft. 3. The attachment for a portable electric drill according to claim 2, wherein a grip is provided near a distal end of the base sleeve. 4. A cutting chip receiver is slidably fitted to the distal end of the tip sleeve, and a compression coil spring is fitted between the spring receiver provided on the tip sleeve and the cutting chip receiver. Attachment for a portable electric drill as described in.