JP4648233B2 - Dust collection cup and electric tool - Google Patents

Description

  The present invention relates to a dust collection cup mounted on a power tool for dust collection, and a power tool such as a hammer drill using the dust collection cup.

  In a power tool such as a hammer drill, a dust collecting cup is attached to the housing so that dust generated from a drilled material is not scattered when a drill bit attached to a chuck at the tip is rotated to perform a drilling operation. As shown in Patent Document 1, this dust collecting cup is composed of a cylindrical cup portion and a cylindrical container that is connected to the front of the cup portion and covers the periphery of the drill bit in a non-contact manner. It has been known. The dust collection cup is attached using a side grip (side handle) provided on the electric tool. That is, by tightening the tension ring of the side grip together with the flange extending behind the cup portion to the housing of the tool, the dust collecting cup is also mounted simultaneously with the mounting of the side grip.

JP-A-9-193146

  However, the dust collection cup is simply tightened by the tension ring of the side grip, and the dust collection cup is interposed between the tension ring and the housing, so the side grip can slip or the dust collection cup can be used alone. Sometimes the dust-collection cup may rattle and the wearing state is unstable.

  Accordingly, an object of the present invention is to provide a dust collection cup and a power tool that are highly reliable at the time of mounting and excellent in usability.

  In order to achieve the above object, the invention according to claim 1 is detachable from a housing of an electric tool in which a bit is attached to a chuck at a front end and a ring-shaped clamp portion of a side handle is detachably attached to a rear housing. A dust collecting cup comprising a possible cup part and a dust collecting cylinder connected to the front of the cup part and covering the periphery of the bit, and a claw part protruding to the axial center side of the cup part behind the cup part By extending a plurality of locking arms provided with a power tool, the claw portion is locked to the housing side with the locking arm inserted between the clamp portion of the side handle and the housing of the power tool. It is characterized in that it can be attached to the camera.

In order to achieve the above object, the invention according to claim 2 is an electric tool in which a bit is attached to a chuck at a front end and a ring-shaped clamp part of a side handle is detachably attached to a rear housing thereof, A plurality of grooves into which the locking arm of the dust collecting cup according to claim 1 can be fitted in the mounted state of the dust collecting cup in the outer surface of the housing to which the clamp portion is mounted. The locking part of the side handle is formed in a state where the locking part that can be locked is formed, the locking arm of the dust collecting cup is fitted into the groove, and the claw part is locked to the locking part. By tightening on the housing, the movement of the locking arm in the direction in which the claw part is disengaged from the locked part is restricted, and the dust collecting cup is mounted.
In order to achieve the above object, the invention according to claim 3 is an electric tool in which a bit is attached to a chuck at a front end and a ring-shaped clamp part of a side handle is detachably attached to a rear housing thereof, A plurality of grooves into which the locking arm of the dust collecting cup according to claim 1 can be fitted in the mounted state of the dust collecting cup in the outer surface of the housing to which the clamp portion is mounted. The part to be locked is formed, and the locking arm of the dust collecting cup is inserted between the clamp part of the side handle attached to the housing and the housing to fit the locking arm into the groove The dust collecting cup is attached by locking the claw portion to the locked portion.

According to the present invention, since the locking force to the power tool can be obtained by the locking arm even with the dust collecting cup alone, the integrity with the power tool is increased, and the dust collecting cup is accidentally detached or rotated by an external force. There is nothing to do. Therefore, the reliability in the mounted state is high and the usability is excellent.
In particular, according to the second aspect of the present invention, since the locking arm is prevented from coming off by the clamp portion of the side handle, the reliability when the dust collecting cup is mounted is further increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an example of a dust collecting cup, FIG. 2 is an explanatory view of a cup portion, and a dust collecting cup 1 includes a cylindrical cup portion 2 attached to a power tool such as a hammer drill, and a cup portion. 2 and a dust collecting cylinder 3 that is coaxially mounted on the front end (left side in the figure). The dust collection cylinder 3 is made of a synthetic resin and has a bellows shape, and is externally mounted to a position where the rear end abuts on the protrusion 4 protruding in the circumferential direction on the outer peripheral surface of the cup portion 2. The retaining protrusions 5, 5,... Projecting forward are engaged with the recesses 6, 6,... Recessed on the inner periphery of the rear end of the dust collection cylinder 3, so that the cup 2 and the dust collection cylinder 3 Are connected together.

  On the other hand, the cup portion 2 is a cylindrical body having a through-hole 8 formed in the center of the small-diameter portion 7 at the front end and opened at the rear, and the small-diameter portion 7 includes a power tool as shown in FIG. A rubber seal cap 9 formed with a through-hole 10 into which a bit can be inserted and cuts 11, 11,... Communicating radially with the periphery of the through-hole 10 is provided with retaining protrusions 12, 12,. Are fitted by engagement with recesses 13 formed in the inner surface of the seal cap 9. Further, four locking arms 14, 14... Projecting rearward are extended at equal intervals in the circumferential direction at the rear end of the cup portion 2. Projecting claw portions 15 are respectively formed.

  As shown in FIGS. 4 to 6, the dust collection cup 1 configured as described above is fixed to a hammer drill 20 which is an example of an electric tool using a side handle 27. The hammer drill 20 includes a chuck 22 to which a drill bit 23 can be attached and detached at the tip of a housing 21 in which a rotation / striking mechanism (not shown) is provided. Fastening portions 24 are formed. On the outer periphery of the fastening portion 24, four grooves 25, 25,... Into which the locking arms 14, 14,... Of the cup portion 2 of the dust collecting cup 1 can be fitted are formed in the axial direction. At the rear end of 25, a locking recess 26 is formed as a locked portion to which the claw portion 15 of the locking arm 14 can be locked.

  As shown in FIG. 6, the side handle 27 includes a clamp portion 28 attached to the fastening portion 24 and a grip (not shown) connected to the clamp portion 28. The clamp portion 28 has a ring shape that has a slit at one place and circulates around the fastening portion 24, and has cylindrical base end portions 29 and 29 located on the tangent line of the fastening portion 24 at both ends. The clamp part 28 can be fixed to and released from the fastening part 24 by expanding and contracting the inner diameter of the clamp part 28 by rotating a bolt (not shown) penetrating both base end parts 29 and 29.

Therefore, in a state where the tightening of the fastening part 24 by the clamp part 28 of the side handle 27 is loosened, the cup part 2 of the dust collecting cup 1 is placed in the groove 25 of the fastening part 24 from the front of the housing 21. When they are attached in a state of being fitted together and pushed back as they are, the claw portions 15 of the respective locking arms 14 are locked to the locking recesses 26. If the clamp portion 28 is tightened in this state, the inner peripheral surface of the clamp portion 28 is close to the outer surface of the lock arm 14 in each groove 25 as shown in FIGS. In order to restrict the movement of both the circumferential direction of the attaching portion 24 and the radial direction, the cup portion 2 is connected integrally with the fastening portion 24, and the attachment of the dust collecting cup 1 is completed. In this state, the inner peripheral surface of the clamp portion 28 does not contact the outer surface of the locking arm 14.
On the other hand, when the dust collecting cup 1 is removed, the locking arms 14 can be moved in the radial direction of the fastening portion 24 by loosening the clamp portions 28 and releasing the locking arms 14. By pulling the portion 2 so as to be pulled forward, the claw portion 15 is detached from the locking recess 26 and the dust collecting cup 1 can be removed.

Thus, according to the dust collecting cup 1 and the hammer drill 20 of the said form, since the latching force to the hammer drill 20 is obtained by the latching arm 14 even with the dust collecting cup 1 alone, the integrity with the hammer drill 20 is increased. The dust collecting cup 1 is not accidentally detached or rotated by an external force. Therefore, the reliability in the mounted state is high and the usability is excellent.
In particular, since the movement of the locking arm 14 in the direction in which the claw 15 is released from the locking recess 26 is restricted in a state where the clamp portion 28 of the side handle 27 is fastened to the housing 21, The retaining arm 14 is prevented from coming off by the clamp portion 28 of the handle 27, and the reliability when the dust collecting cup is mounted is further increased.

  In the above embodiment, the dust collecting cup's locking arm just fits within the groove of the fastening part, and the dust collecting cup cannot be removed in the tightened state of the clamp part of the side handle. Like the hammer drill 20a shown in FIGS. 7 and 8, the grooves 25a, 25a,... Formed in the fastening part 24 are equal to or more than the thickness of the locking arm 14 including the claw part 15 of the dust collecting cup 1. The claw portion 15 may be disengaged from the locking recess 26 even when the clamp portion 28 is tightened. In this case, the dust collection cup 1 is prevented from coming off by the locking force between the claw portion 15 and the locking recess 26, but the dust collection cup 1 can be attached and detached without loosening the clamp portion 28 of the side handle 27 one by one. Therefore, in terms of usability, it is superior to the previous form.

Further, the form of the locking arm is not limited to the above form, and the number of the locking arms can be increased or decreased, and the design can be changed. Similarly, the groove can be increased or decreased corresponding to the locking arm. However, the number of grooves can be made larger than that of the locking arms, and the phase at which the dust collecting cup can be mounted can be set more.
Furthermore, although the to-be-latched part is made into the latching recessed part which continues to the groove | channel and is intermittent in the circumferential direction in the said form, it does not interfere in the groove | channel shape which continues in the circumferential direction.

And if the dust collection cup of this invention is an electric tool which has the to-be-latched part which can latch the nail | claw part of a latching arm to a housing, even if it is an electric tool which does not have a groove | channel in the fastening part of a side handle It can be installed. However, in this case, the rotation is relied on the side handle tightening. Even if there is no locked part, a ring-shaped spacer is interposed between the clamping part of the clamp part and the locking arm of the dust collecting cup, and the claw part of the locking arm is attached to the end of the spacer. The dust collecting cup can be used if it is locked.
In addition, as an electric tool, if the dust collecting cup of this invention can be mounted | worn, not only a hammer drill but other models, such as an electric drill, can apply this invention.

It is a longitudinal cross-sectional view of a dust collection cup. It is explanatory drawing (the left shows a front, the center shows a side, and the right shows a back, respectively) of a cup part. It is explanatory drawing which looked at the dust collection cup with which the hammer drill was mounted | worn from the front. It is AA sectional view. It is a BB sectional view. It is CC sectional view taken on the line. It is a longitudinal cross-sectional view which shows the state which attached the dust collection cup to the hammer drill of the example of a change. It is DD sectional view taken on the line.

Explanation of symbols

1 .... Dust collecting cup, 2 .... Cup part, 3 .... Dust collecting cylinder, 9 .... Seal cap, 14 .... Locking arm, 15 .... Claw part, 20 .... Hammer drill, 21 ... Housing, 22 .. Chuck, 23 .. Drill bit, 24 .. Fastening part, 25 .. Groove, 26 .. Locking recess, 27 .. Side handle, 28.

Claims (3)

A cup part that can be attached to and detached from the housing of the power tool, in which a bit is attached to the chuck at the front end and a ring-shaped clamp part of the side handle is detachably attached to the rear housing, A dust collection cup comprising a dust collection cylinder covering the periphery of the bit,
A plurality of locking arms provided with claw portions protruding toward the axial center side of the cup portion are extended behind the cup portion,
The claw portion is locked to the housing side in a state where the locking arm is inserted between the clamp portion of the side handle and the housing of the electric tool, so that the mounting to the electric tool can be performed. Characteristic dust collection cup. A power tool in which a bit is attached to the chuck at the front end and a ring-shaped clamp part of the side handle is detachably attached to the rear housing,
A plurality of grooves into which the locking arm of the dust collecting cup according to claim 1 can be fitted in the mounted state of the dust collecting cup on the outer surface of the housing to which the clamp portion is mounted. Forming a locked part that can be locked by the claw part of the arm,
By fitting the locking arm of the dust collecting cup into the groove, and tightening the clamp part of the side handle to the housing in a state where the claw part is locked to the locked part, The power tool, wherein the movement of the locking arm in a direction in which the claw part is detached from the locked part is restricted, and the dust collecting cup is mounted. A power tool in which a bit is attached to the chuck at the front end and a ring-shaped clamp part of the side handle is detachably attached to the rear housing,
A plurality of grooves into which the locking arm of the dust collecting cup according to claim 1 can be fitted in the mounted state of the dust collecting cup on the outer surface of the housing to which the clamp portion is mounted. Forming a locked part that can be locked by the claw part of the arm,
The locking arm of the dust collecting cup is inserted between the clamp part of the side handle attached to the housing and the housing to fit the locking arm into the groove, and the claw part is moved to the locked part. The electric power tool, wherein the dust collecting cup is mounted by being engaged with the power tool.

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