JP2001277154A - Protective cover for power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply exchange a cutter while the power tool is covered with the protective cover. SOLUTION: The protective cover 7 of the power tool is detachably fixed to a housing 8 of the power tool. The protective cover 7 is divided as a plurality of protective cover pieces 7a, 7b, and the plurality of protective cover pieces 7a, 7b are rotatably connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective cover for covering a blade or the like of a power tool.

[0002]

2. Description of the Related Art U.S. Pat. No. 4,932,164 discloses a protective cover for a power tool. As shown in FIG. 8, the protective cover 1 is detachably fixed to a rim portion 2a of a housing 2 in which a motor of a power tool is stored by a plurality of mounting screws 3.

An operation window 4 is formed in the protective cover 1 so that an adjustment operation of the balance weight 5 and a rotation switching operation of the pad 6 can be performed through the operation window 4.

[0004]

However, the protective cover 1 for the electric tool has the following problems. 1. When replacing a blade or the like, it is necessary to loosen the mounting screw 3 and attach / detach the protective cover 1 to / from the housing 2.
Replacement work of blades etc. is troublesome. 2. Since the balance adjustment and the rotation adjustment operation are performed through the narrow operation window 4, the adjustment operation is troublesome.

An object of the present invention is to solve the above problems.

[0006]

According to a first aspect of the present invention, there is provided a power tool protection cover (7) detachably fixed to a power tool housing (8). The cover (7) is divided into a plurality of protective cover pieces (7a, 7b), and the plurality of protective cover pieces (7a, 7b) are rotatably connected to each other. Is adopted.

According to a second aspect of the present invention, the protective cover (7) is provided with locking means (31, etc.) for fixing the protective cover pieces (7a, 7b) to each other.
The described power tool protective cover (7) is employed.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the protective cover 7 is attached to a housing 8 of the power tool. Housing 8
Inside, a transmission mechanism such as a motor and a gear (not shown) is provided. An output shaft 9 protrudes from a front portion of the housing 8, a handle portion 8a protrudes from a lower portion of the housing 8, and a switch 10 for controlling driving of a motor is provided near a base of the handle portion 8a.

For example, a sanding pad 11 is attached to the output shaft 9. Since the sanding pad 11 is eccentric with respect to the output shaft 9, a balance weight 12 is provided. An attachment such as a tool other than the sanding pad 11 or a double action unit can be attached to the output shaft 9.

As shown in FIGS. 1 to 3, a protective cover 7 is provided.
Is formed in a substantially bottomed cylindrical shape, and has a cylindrical portion 13 and a bottom portion. The bottom part is divided into a disk-shaped mounting part 14 and a conical wall part 15 around it. A relief hole 16 for inserting the output shaft 9 is formed at the center of the mounting portion 14, and a plurality of elongated holes 18 through which set screws 17 pass are formed radially around the relief hole 16 of the mounting portion 14. I have. The protective cover 7 is fixed to the front end face of the housing 8 with a plurality of setscrews 17 so that the mounting portion 14 is attached to the housing 8.
Removably attached to. The cylindrical portion 13 of the protective cover 7 is provided so that the output shaft 9 comes on the center axis thereof, and covers the shaft portion of the sanding pad 11 and the balance weight 12.

As shown in FIGS. 1 to 3, the protective cover 7 is divided into two protective cover pieces 7a and 7b. The number of divisions is not limited to two, but may be three or more.

One protective cover piece 7a has the entire mounting portion 14 and one of the conical wall portion 15 and the cylindrical portion 13 divided by a plane including their central axes, and the other protective cover piece 7b Has another half of the conical wall portion 15 and the cylindrical portion 13 divided by a plane including the central axis thereof. One protective cover piece 7a is fixed to the housing 8 via the mounting portion 14, and the other protective cover piece 7b is connected to the one cover piece 7a.

These two protective cover pieces 7a and 7b are
The cylindrical portion 13 is rotatably connected to each other via a hinge 21 near one of the mating surfaces 19 and 20. Reference numeral 21a in FIGS. 1 to 3 indicates a hinge pin which is a pivot of the hinge 21. The two protective cover pieces 7a and 7b are rotatably connected to each other by the hinge pin 21a. The two protective cover pieces 7a and 7b are connected to each other at the other mating surfaces 22 and 23 of the cylindrical portion 13 via engaging means so as to be freely detachable from each other. The engaging means is composed of a convex portion 24 provided on the cylindrical portion 13 of one protective cover piece 7a and a concave portion 25 provided on the cylindrical portion 13 of the other protective cover piece 7b. The convex portion 24 is a cylindrical portion 1 of one protective cover piece 7a.
3 is formed on the surface of the protective cover piece 7b on the cylindrical portion 13 of the other protective cover piece 7b so as to be elongated along the generatrix. It is formed so that. As shown in FIG. 3A, the two protective cover pieces 7a and 7b are integrated by the engagement of the concave and convex portions 25 and 24, and as shown in FIG. The protective cover piece 7b is rotatable about the hinge pin 21a. The uneven portions 25 and 24 may be replaced between the two protective cover pieces 7a and 7b. The positions of the hinge 21 and the concave and convex portions 25 and 24 of the protective cover 7 with respect to the housing 8 can be adjusted by changing the mounting angle between the mounting portion 14 and the front end surface of the housing 8 for each pitch of the elongated holes 18. The opening position of the protective cover 7 can be appropriately changed by the adjustment.

As shown in FIG. 3, one protective cover piece 7
A mating surface cover 27 for covering the mating surfaces 22 and 23 is integrally formed on the conical wall portion 15a. The edge of the conical wall portion of the other protective cover piece 7b enters below the mating surface cover portion 27 of the one protective cover piece 7a, and the mating surfaces 22, 23 of the two protective cover pieces 7a, 7b abut each other. In addition, a semicircular cover portion 28 that covers the periphery of the mounting portion 14 of the other protective cover piece 7a is formed on one of the protective cover pieces 7b.

As shown in FIGS. 2 to 7, the two protective cover pieces 7a and 7b are provided with a locking means for opening and closing the protective cover pieces 7a and 7b so as to be openable and closable together with the engaging means.

The locking means is provided with one of the protective cover pieces 7.
slide rails 29 formed on both sides of the ridge 26 of FIG.
And a latch piece 30 formed on the cylindrical portion 13 of the other protective cover piece 7a in parallel with the slide rail 29, and a slide piece 31 slidably engaged with the slide rail 29 and the latch piece 30. I have. As shown in FIG.
The slide piece 31 is formed along the slide rail 29 by the cylindrical portion 1.
3 can be slid in parallel to its generatrix, and can reciprocate between a locked position shown in FIG. 3A and an unlocked position shown in FIG. The latch piece 30 engages with the engagement portion 32 of the slide piece 31 when the slide piece 31 comes to the lock position, but separates from the engagement portion 32 of the slide piece 31 when the slide piece 31 comes to the unlock position. It is formed as follows.

The locking means is provided with a stopper so that the slide piece 31 is reliably stopped at each of the lock position and the unlock position and does not fall off the slide rail 29. That is, as shown in FIG. 4, the slide piece 31 is provided on the end face 29 of the slide rail 29 in accordance with the lock position.
a first stopper piece 33 is formed to abut the end 34a of the groove 34 formed in the slide piece 31 on the protruding strip 26 corresponding to the unlock position. Is done. Slide piece 31 is slide rail 2
When the second stopper piece 35 comes into the unlock position after sliding on the top 9, the second stopper piece 35 hits the end 34 a of the groove 34 and stops, thereby preventing the second stopper piece 35 from slipping out of the slide rail 29.
Slides on the slide rail 29 in the opposite direction to the lock position, the first stopper piece 33 hits the end face 29a of the slide rail 29 and stops, so that the slide rail 29
Escape from the opposite direction.

The locking means provides a click feeling by the slide operation of the slide piece 31.
As shown in the figure, a click stop mechanism is provided. The click stop mechanism includes a click piece 36 protruding from one side of the slide piece 31 toward the cylindrical portion 13 of the protective cover piece 7b, and a click rail 37 provided on the cylindrical portion 13 in parallel with the slide rail 29. Prepare. The click piece 36 engages with one end 37a of the click rail 37 when the slide piece 31 reaches the lock position shown in FIG. 5A, and clicks when it comes to the unlock position shown in FIG. It engages with the other end 37b of the rail 37. When the slide piece 31 slides along the slide rail 29, the click piece 36 becomes the click rail 37.
However, when the slide piece 31 reaches one of the locked position and the unlocked position, the click piece 36 falls from the ends 37a and 37b of the click rail 37, and a click feeling is obtained.

Next, the operation of the protective cover having the above configuration will be described.

The protective cover 7 is attached to a power tool as required. At the time of mounting, the mounting portion 14 formed on the protective cover 7 is fixed to the housing 8 of the power tool with a set screw 17 (see FIGS. 1 and 2).

When the slide piece 31 is slid from the lock position to the unlock position after the protection cover 7 is mounted on the power tool, the locked state between the protection cover pieces 7a and 7b is released (see FIG. 4). When the slide piece 31 is slid to the unlock position, the slide piece 31 moves smoothly while being guided by the slide rail 29. Further, the click piece 36 formed on the slide piece 31 rides on the click rail 37 and slides. When the slide is completed, the click piece 36 comes off the click rail 37. For this reason, a click feeling is generated when the movement of the slide piece 31 is completed, and the unlock operation can be reliably performed (see FIG. 5).

When the slide piece 31 is slid in the unlocking direction, the end 34a of the groove 34 comes into contact with the second stopper piece 35, and the slide rail 2 of the slide piece 31
9 is regulated (see FIG. 4).

After the unlocking operation, the concave and convex portions 25 and 24 of the engaging means are further separated, and then the protective cover piece 7b is turned around the hinge pin 21a to open the protective cover 7 (FIG. 2). 3).

After the protective cover 7 is opened, a tool such as the sanding pad 11 and an attachment such as a double action unit are attached to the output shaft 9 of the electric tool. In addition, the user exchanges attachments and tools, and adjusts the amount of eccentricity.

After attaching the attachment or the tool to the output shaft 9, the protective cover piece 7b is rotated in the opposite direction to the previous one,
The mating surfaces 19, 20, 22, of the protective cover pieces 7a, 7b
23 are matched with each other, and the protective cover 7 is closed (see FIG. 3). When the protective cover 7 is closed, the concave / convex portions 25 and 24 serving as engaging means are engaged, and the protective cover pieces 7a and 7b are temporarily fixed to each other.

When the slide piece 31 is slid to the lock position in order to lock the lock means, the slide piece 31 is smoothly guided by the slide rail 29, and the engaging portion 32 of the slide piece 31 is moved to the protective cover. Engage with the latch piece 30 of the piece 7a (see FIGS. 4 and 6). When the slide piece 31 slides, the click piece 36 of the slide piece 31 rides on the click rail 37 and moves in the lock direction, and then comes off the click rail 37, so that a click feeling is generated. Thereby, the switching operation from the unlocking to the locking can be reliably performed (see FIG. 5).

When the slide piece 31 is slid to the lock position, the first stopper piece 33 formed on the slide piece 31 comes into contact with the end surface 29a of the slide rail 29,
Further movement of the slide piece 31 from the lock position is restricted. As a result, the protective cover piece 7 is
Is securely locked to the protective cover piece 7a fixed to the cover.

After the protection cover 7 is locked, the operator grips the handle portion 8a of the electric tool, pulls the switch 10, starts the motor, and performs a predetermined operation. Attachments and rotating parts, turning parts, and the like of the attachments and tools that are operated during this work are covered with the protective cover 7, so that contact with an operator or the like is prevented.

[0030]

According to the first aspect of the present invention, the protective cover detachably fixed to the housing of the power tool is divided into a plurality of protective cover pieces, and the plurality of protective cover pieces are mutually rotated. Since it is movably connected, the working portion can be covered during work to enhance safety, and at the time of non-work, replacement of tools and attachments and adjustment of the amount of eccentricity can be performed easily and quickly. .

According to the second aspect of the present invention, since the protection cover is provided with the lock means for fixing the protection cover pieces to each other, the protection cover can be securely fixed in the closed state. Since the open state can be changed by a simple operation, workability is improved.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a power tool equipped with a protective cover according to the present invention.

FIG. 2 is a front view of the protective cover as viewed from the left side in FIG.

FIG. 3 is a rear view of the protective cover, in which (A) shows a closed state and (B) shows an open state.

FIG. 4 is a view taken along line IV-IV in FIG. 3 (A);
(A) shows a locked state, and (B) shows an unlocked state.

5A is a view in the direction of arrow V in FIG. 3A, wherein FIG. 5A shows a locked state and FIG. 5B shows an unlocked state.

FIG. 6 is an enlarged view of a portion VI in FIG. 3 (A).

FIG. 7 is an enlarged view of a portion VII in FIG. 3 (B).

FIG. 8 is an elevational view showing a power tool equipped with a conventional protective cover.

[Explanation of symbols]

 7: Protective cover 8: Housing 7a, 7b: Protective cover piece 31: Slide piece

Claims (2)

[Claims] 1. A protection cover for a power tool detachably fixed to a housing of the power tool, wherein the protection cover is formed by dividing into a plurality of protection cover pieces, and the plurality of protection cover pieces are rotatable relative to each other. A protective cover for a power tool, wherein the protective cover is connected to the power tool. 2. The protective cover for an electric power tool according to claim 1, wherein said protective cover is provided with locking means for fixing said protective cover pieces to each other.