JP2002283207A - Belt sander attachment and belt sander - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance an operability and a workability of a belt sander. SOLUTION: The belt sander attachment 1 has a first slide bar 2 in which a base 3 is connected to an end part at a right angle; and a second slide bar 5 provided slidably along a longitudinal direction of the first slide bar 2 and forced to a position leaving from the base 3 by a tension spring 10. A mounting piece 11 attachable to a pulley cover projectedly provided on the belt sander is provided on the second slide bar 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment for a belt sander which is used by being mounted on a belt sander, and a belt sander using the attachment.

[0002]

2. Description of the Related Art In a belt sander, an output shaft is protruded from a side of a housing provided with a motor, and a driving roller is provided on the output shaft. A base end of the pulley cover to be gripped is rotatably connected around a driving roller, and a sanding belt is stretched between the driving roller and the driven roller. Therefore, when the motor is driven and the drive roller rotates, the sanding belt rotates between the driven roller and the driven roller, so that the operator grips the handle provided at the rear end of the housing to support the belt sander while holding the arm. The polishing operation is performed by bringing the tip of the substrate into contact with the workpiece.

[0003]

As described above, since the operation of the belt sander is exclusively performed by freehand, the direction of the arm can be accurately maintained, for example, when polishing a vertical surface or a horizontal surface of the workpiece. Hateful. Therefore, not only the operability and workability are reduced, but also the processing accuracy is deteriorated.

Accordingly, an object of the present invention is to provide an attachment for a belt sander capable of improving the operability and workability of the belt sander and performing highly accurate machining. An object of the invention described in Item 5 is to provide a belt sander that can perform high-precision machining by improving operability and workability.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a first slide body having a base connected to an end at a right angle and a belt sander can be attached to the first slide body.
The second slide body is provided slidably along the first slide body at a predetermined stroke, and is in a posture parallel to an arm protruding from the belt sander and extending a sanding belt when attached to the belt sander. And an attachment for a belt sander in which a base is formed with a cutout portion that allows the arm of the attached belt sander to pass along with the relative approach between the first slide body and the second slide body. It is. In addition to the object of the first aspect, the second aspect of the present invention is to change the second slide body to the first slide in order to further improve operability and workability by obtaining a simple set and stability at the time of work. An urging means for urging the body away from the base is provided. According to the third aspect of the present invention, in addition to the object of the first or second aspect, the first slide body is provided with a slide of the second slide body to the base side in order to improve ease of use according to the usage mode. A stopper that can be restricted at any position is provided. According to a fourth aspect of the invention, for the same purpose as the third aspect, the angle of the base with respect to the first slide body can be changed.

According to a fifth aspect of the present invention, there is provided a belt sander including the belt sander attachment according to any one of the first to fourth aspects.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an attachment for a belt sander (hereinafter abbreviated as “attachment”), and FIG. 2 is a plan view, a front view, and a right side view, respectively. The perforated square plate-shaped base 3 is connected to the lower end at a right angle, the first slide bar 2 as a first slide body having a U-shaped cross section, and the U-shaped inner surface side of the first slide bar 2. A second slide bar 5 as a second slide body to be mounted. First
In the slide bar 2, elongated holes 6, 7 of the same length are arranged in a straight line along the longitudinal direction.
Then, screws 8, 8 whose heads have a diameter larger than the width of the long holes 6, 7 penetrate from the U-shaped outer surface side of the first slide bar 2, respectively.
The first slide bar 2 and the second slide bar 5 are relatively slid in the longitudinal direction by a predetermined stroke in which the screws 8 contact the upper and lower ends of the long holes 6 and 7, respectively. It is possible. However, a tension spring 10 is stretched between an upper end on one side of the U-shaped end of the first slide bar 2 and a hook piece 9 bent at the lower end of the second slide bar 5. Therefore, the second slide bar 5 is urged in the direction away from the base 3 and is normally at the position shown in FIGS. 1 and 2 where the screws 8 are in contact with the upper ends of the long holes 6 and 7, respectively.

On one side edge of the second slide bar 5, a mounting piece 11 which is bent and formed in a key shape and whose end is perpendicular to the second slide bar 5 in a plane direction is integrally extended,
Two through holes 12 and 13 are provided in the mounting piece 11 in parallel with the sliding direction of the second slide bar 5.

FIG. 3 is a front view of the belt sander 20. The belt sander 20 has a built-in motor (not shown).
Motor housing 21 whose front face is closed by bracket 22
A drive roller 24 is integrally fixed to an output shaft of the motor, which has a handle 23 extending to the side of the motor housing 21 and protruding to the front side through the bracket 22. A base end of a pulley cover 26 is fitted to a projection 25 of the bracket 22 projecting forward from the drive roller 24, and is rotatable about the drive roller 24. In the pulley cover 26, an arm 28 provided with a driven roller 27 at the tip is provided slidably on the same straight line as the pulley cover 26 and urged in a protruding direction from the pulley cover 26. A belt-shaped sanding belt 29 is stretched between the driven roller 27 and the driven roller 27. Reference numeral 30 denotes a lever capable of fixing and releasing the pulley cover 26 at a predetermined angle with respect to the bracket 22. Further, on the rear surface of the pulley cover 26, as shown in FIG. 4, a projection 31 and a screw hole 32 are provided so that the projection 31 is closer to the motor housing 21 and the two through holes 12, 13 of the attachment piece 11 of the attachment 1. Are arranged side by side in the longitudinal direction of the pulley cover 26 at the same interval as the above.

Attachment 1 structured as described above
4, the mounting piece 11 is applied to the rear surface of the pulley cover 26 as shown in FIG.
, And the screw 14 penetrating the lower through hole 13 is screwed into the screw hole 32. Then, as shown in FIG. 5, since the mounting piece 11 is fixed along the rear surface of the pulley cover 26, the first slide bar 2 and the second slide bar 5 are in a posture parallel to the arm 28. Since the second slide bar 5 is urged by the tension spring 10 in a direction away from the base 3 of the first slide bar 2, when viewed from the belt sander 20 to which the second slide bar 5 is directly mounted,
The base 3 is urged forward in the protruding direction of the arm 28, and is normally at a position slightly away from the tip of the arm 28.
At this time, the square hole 4 of the base 3 is located on an extension of the arm 28.

In this mounted state, the base 3 is fixed,
If the user grips the handle 23 of the belt sander 20 and pushes the handle 23 toward the base 3 as it is, the belt sander 20 and the second slide bar 5 slide against the bias of the tension spring 10, and the arm 28 becomes a corner of the base 3. The arm 28 protrudes perpendicularly to the base 3 through the hole 4, and the amount of protrusion of the arm 28 from the base 3 can be adjusted by adjusting the amount of pushing. Therefore, for example, as shown in FIG. 6, by setting the base 3 on the upper surface 33 of the workpiece W, the inner surface of the hole 34 formed in the upper surface 33 is moved by the sanding belt 29 of the arm 28 projecting downward from the base 3. Can be easily polished. Similarly, as shown in FIG. 7, the horizontal surface 36 can be easily polished by the sanding belt 29 of the arm 28 by turning the belt sander 20 sideways with respect to the workpiece W and applying the base 3 to the vertical surface 35. it can. On the other hand, since the arm 28 projects from the base 3 only when the belt sander 20 is pushed in,
If the material to be polished is a relatively soft material such as wood, the arm 28
The perforation itself can be performed by the sanding belt 29 by pressing the driven roller 27 at the leading end.
When the belt sander 20 is separated from the workpiece W when the work is completed, the first slide bar 2 projects in the direction away from the belt sander 20 by the bias of the tension spring 10, and the tip of the arm 28 again comes into contact with the base 3. The state returns to the state shown in FIG.

As described above, according to the attachment 1 and the belt sander 20 of the above embodiment, the first connecting the base 3 is performed.
A slide bar 2 and a second slide bar 5 that is parallel to the arm 28 of the belt sander 20 when attached to the belt sander 20 are provided.
When the belt 28 is attached to the belt sander 20, the arm 28 is always moved relative to the base 3 by forming the square hole 4 that allows the passage of the arm 28 with the relative approach between the arm 28 and the second slide bar 5. Because it can be put in and out in the exact orthogonal direction,
The belt sander 20 is stabilized by using the base 3,
Good operability and workability can be obtained, and processing accuracy is also improved. Also, the second slide bar 5 is connected to the base 3
By providing the tension spring 10 for urging in the direction away from the base, the base 3 always comes into first contact with the workpiece at the start of the work, and the attachment 1 can be easily set. Is constantly pressed against the workpiece to stabilize the attachment 1. Further, the amount of protrusion of the arm 28 can be adjusted. Therefore, further improvement in operability and workability can be expected. In particular, in the above embodiment using the tension spring 10, an accurate sliding operation can be realized with a simple structure.

In the above embodiment, the first slide bar 2 is always returned to the position shown in FIG. 5 by the urging of the tension spring 10 when the belt sander 20 is released from being depressed, as shown in FIG. And thumbscrew 3
7 is screwed into the second slide bar 5 by passing through the plate 38 in contact with the outer surface of the first slide bar 2 and the elongated hole 6 on the upper side of the first slide bar 2, and screwed into the second slide bar 5. If a fixing means for holding the first slide bar 2 between the plate 38 and the second slide bar 5 is added, a predetermined pushing position (the arm 2
8 protruding from the base 3), the first slide bar 2 and the base 3 can be fixed. Similarly, at the position of the elongated hole 7 on the lower side of the first slide bar 2, the thumb screw 39
Through the plate 40 on the outer surface of the first slide bar 2 and the elongated hole 7 so as to sandwich the first slide bar 2.
Screw into a nut 41 larger than the width of
By adding a structure that allows the nut 41 to be fixed at an arbitrary slide position along the elongated hole 7 by screwing the nut 41, the nut 41 can be a stopper for restricting the slide of the second slide bar 5. By providing such a fixing means for the base 3 and a slide stopper, it becomes convenient when the same work is performed continuously, and the usability according to the use mode can be improved.

On the other hand, in the above embodiment, the base 3 is formed integrally with the first slide bar 2, but the lower end of the first slide bar 2 and the upper surface of the base 3 are fixed by pins 42 as shown in FIG. A guide link 43 is attached to the base 3 so as to be rotatable, and has an arc-shaped long hole 44 centered on the pin 42, and a nut 45 fixed to the outer surface of the first slide bar 2. Then, a thumb screw 46 penetrating through the long hole 44 of the guide link 43 is screwed in parallel with the pin 42 so that the guide link 43 can be tightened.
Can be changed arbitrarily. Therefore, the angle of the arm 28 protruding from the base 3 can be adjusted, and the usability according to the use mode can be improved similarly to the modified example of FIG.

In the above embodiment, the first slide body, the second slide body,
Although the slide body has a bar shape, it may be a telescope type in which both are coaxially and slidably connected as sleeves having different diameters. The urging means is not limited to a tension spring, but a compression spring or the like may be used. The urging means may be eliminated, and the first slide body and the second slide body may slide free from each other. It is also possible to keep the structure such that it always projects at a fixed length. Furthermore, the cutout portion may be a notch formed from the end of the base as long as the shape allows the passage of the arm. desirable.

A U-shaped clamp body 49 can be mounted on the base 3 as shown in FIG.
That is, the nuts 47, 47 are fixed on the base 3, and a pair of parallel slide bars 50, 50 provided on the upper end of the clamp body 49 are slidably applied on the nuts 47, 47, and the slide bars 50, 50 are provided. Slot 51 provided in the
Screw the thumb screws 48, 48 into the nut through 51,
While the slide bars 50, 50 can be tightened at any slide position, the clamp pieces 52 of the clamp body 49, which are parallel to the base 3, are provided with thumb screws 53, 53, each having a pressing piece 54 at the upper end in an orthogonal shape, respectively. It is screwed from. Accordingly, in this case, when the workpiece W is sandwiched between the base 3 and the clamp piece 52 and the thumb screws 53, 53 are screwed into the workpiece W, the pressing pieces 54, 54 contact the lower surface of the workpiece W. And firmly clamp it against the base 3. Therefore, the base 3 can be stably and accurately machined even when a thick workpiece such as a door is drilled at a right angle. Of course, the shape of the clamp body can be appropriately changed in design. For example, the clamp body can be fixed at an arbitrary slide position along the first slide bar 2 and can have an L-shape having a clamp piece parallel to the base at the lower end. it can.

[0017]

According to the first aspect of the present invention, there is provided an attachment for a belt sander including the first slide body and the second slide body, wherein the cutout portion is formed in a base of the first slide body. When attached to the belt sander, the arm of the belt sander can always be inserted into and removed from the base in an accurate orthogonal direction, so using the base stabilizes the belt sander and provides good operability and workability. Properties can be obtained and the processing accuracy can be improved. According to the second aspect of the invention, in addition to the effect of the first aspect,
By providing the urging means for urging the second slide body in the direction away from the base of the first slide body, setting of the attachment is simplified at the start of the work, and the attachment is stabilized during the work. In addition, the amount of protrusion of the arm can be adjusted. Therefore, further improvement in operability and workability can be expected. According to the third or fourth aspect of the invention, in addition to the effects of the first or second aspect, it is possible to improve the usability according to the usage mode. According to the invention as set forth in claim 5, the belt sander provided with the belt sander attachment according to any of claims 1 to 4 has the effect of any of claims 1 to 4. You can get a belt sander.

[Brief description of the drawings]

FIG. 1 is a perspective view of an attachment.

FIG. 2A is a plan view of an attachment. (B) It is a front view of an attachment. (C) It is a right view of an attachment.

FIG. 3 is a front view of a belt sander.

FIG. 4 is a perspective view showing a structure for attaching an attachment to a belt sander.

FIG. 5 is a front view of a belt sander to which an attachment is attached.

FIG. 6 is an explanatory diagram showing a use state of the belt sander.

FIG. 7 is an explanatory diagram showing a use state of the belt sander.

FIG. 8A is a front view of a modification of the attachment. (B) It is a right view of the example of a change of an attachment.

FIG. 9A is a front view of a modification of the attachment. (B) It is a right view of the example of a change of an attachment.

FIG. 10 is a perspective view showing a modification of the attachment.

[Explanation of symbols]

1. Attachment, 2. First slide bar, 3.
・ Base, 4 ・ ・ Square hole, 5 ・ ・ Second slide bar, 10
..Tension spring, 11..Mounting piece, 20 ..
Belt sander, 26 pulley cover, 28 arm.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mamoru Kawasaki 3-11-8, Sumiyoshicho, Anjo-shi, Aichi F-term in Makita Co., Ltd. (Reference) 3C058 AA05 AA09 AA11 AA13 AA14 AC01 BA02 BA07 BB03 BC02 CB01 CB03 CB04

Claims (5)

[Claims] 1. A first slide body having a base connected at a right angle to an end thereof, and a first slide body which is attachable to a belt sander and slidable along a predetermined stroke along the first slide body. And a second slide body in a parallel posture with an arm protruding from the belt sander and stretching a sanding belt, wherein the base is provided with the first slide body and the second slide body. An attachment for a belt sander, wherein a cut-off portion is formed to allow the arm of the mounted belt sander to pass along with the relative approach. 2. An urging means for urging the second slide body in a direction away from the base of the first slide body.
Attachment for belt sander described in. 3. The attachment for a belt sander according to claim 1, wherein the first slide body is provided with a stopper capable of restricting the slide of the second slide body toward the base at an arbitrary position. 4. The belt sander attachment according to claim 1, wherein an angle of the base with respect to the first slide body can be changed. 5. A belt sander comprising the belt sander attachment according to claim 1.