JPH0919860A - Sander - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change simply the place in service of an abrasive material by installing at the bottom surface rotatably a polish disc where the abrasive material can be mounted on the side opposite the eccentricity mechanism of a base, and furnishing a detaining mechanism to consolidate the polish disc with the base in a specified position between the base and disc. SOLUTION: When a polish disc 15 is grasped and pulled down in case the front corner of a sand paper 18 has worn through the polish works, three locating projections 24 separate from a cylindrical part 23 so that the disc 15 becomes rotatable, and it is rotated approx. 120 deg. to left or right from this position. Thereby the projections 24 are inserted in the cylindrical part 23 to loosen the tensile force, and then the projections 24 are again fitted in the cylindrical part 23 to cause the two to be consolidated, and the polish works can be carried out at an angle which liberates the sand paper 18 from wearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output shaft of a motor, to which a base is connected in an orthogonal manner via an eccentric mechanism, and the base is provided with a polishing plate having a bottom surface to which an abrasive material such as sandpaper is attached. Regarding Thunder.

[0002]

2. Description of the Related Art In the above sander, the polishing dish has a triangular shape such as a triangle or a quadrangle so that polishing can be performed in a narrow space or a corner, and the polishing material such as sandpaper has the same shape as the polishing dish. Then, it is attached to the bottom surface of the polishing dish with a hook-and-loop fastener, etc., or it is fixed with a clasp, a clip, etc. Since the sandpaper is used intensively, abrasion of the sandpaper at that portion is accelerated, and the adhesive force of the surface fastener at the corner is also deteriorated. Therefore, for example, in the case of a triangular polishing dish, the sandpaper is once peeled off from the polishing dish and rotated, and all three corners can be used by changing the place of use to another corner. Degradation of the hook-and-loop fastener on the dish side is inevitable. Therefore, there is also adopted a structure in which the polishing dish attached to the base by screwing or the like is temporarily removed, and the polishing dish is rotated together with the sandpaper so that the use position of the sandpaper can be changed.

[0003]

However, changing the location of use of the above-mentioned abrasive material involves the work of peeling and re-adhering it once or attaching and detaching the polishing dish with a screw, which is troublesome. When reattaching only the abrasive material with a surface fastener or the like, it is necessary to align the positions accurately, and if misalignment occurs, it will be reattached, which is an extra task.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a sander capable of accurately changing the location of use of an abrasive material by a simple operation, the structure of which is provided to an output shaft of a motor via an eccentric mechanism. The bases are connected in an orthogonal manner, on the opposite side of the eccentric mechanism of the base, a polishing dish body capable of mounting an abrasive on the bottom surface is rotatably provided, and further between the base and the polishing dish body, It is characterized in that a locking mechanism for integrating the polishing dish body with the base at a predetermined position is provided. Further, the locking mechanism is rotatably supported by the base and urges the polishing dish body which can be moved back and forth in the axial direction to urge the base, and the opposing surfaces of the base and the polishing dish body, respectively. And a locking portion which is provided and engages with each other only at the advance position of the polishing dish toward the base side.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a polishing portion of the sander 1. A bevel gear 4 is integrally fixed to a motor shaft 3 of a motor (not shown) built in the housing 2. The bevel gear 4 is orthogonal to the motor shaft 3. Then, the rotation of the motor can be transmitted to the crankshaft 5 by meshing with a bevel gear 6 integrated with the vertical crankshaft 5. The crankshaft 5 is axially supported by ball bearings 7 and 8 in the housing 2, and an eccentric shaft 10 integrally fixed with a balancer 9 is provided at the lower end of the crankshaft 5 so as to project. It is supported by a ball bearing 11 provided in a cylindrical portion 13 at the center of a base 12 having a substantially equilateral triangle. Further, a plurality of feet 14 and 14 are vertically extended on the upper surface of the base 12, and a plate 14a at the upper end of the foot 14 is fixed to the housing 2 so as to prevent the base 12 from being supported below the housing 2. ,
Due to the eccentric rotation of the eccentric shaft 10 accompanying the rotation of the crankshaft 5, a circular locus motion (orbital motion) is achieved.

Below the base 12, the base 12
A polishing dish body 15 having the same equilateral triangle shape as the above is arranged. The polishing dish body 15 includes an upper mounting plate 16, a pad 17 integrally attached to the lower surface of the mounting plate, and a sandpaper 18 attached to the lower surface of the pad 17 by a surface fastener. The hole 15a is loosely inserted into the cylindrical portion 13 of the base 12 and is rotatably supported.
Further, the through hole 15a portion of the mounting plate 16 becomes an inverted L-shaped standing portion 19 to form a space between the tubular portion 13 and the through hole 15a, while the tubular portion 13 has the through hole 15a. A cap 20 having a flange portion 21 having a diameter larger than the diameter is screwed, and the polishing dish body 15 loosely inserted into the cylindrical portion 13 is provided between the upright portion 19 and the flange portion 21 in the axial direction. It is possible to move back and forth. Further, a compression spring 22 is interposed between the upright portion 19 and the collar portion 21 to urge the polishing dish body 15 together with the upright portion 19 toward the base 12 side. Also, as shown in FIG. 2, on the back surface of the base 12, cylindrical portions 23, 23, 23 are provided which have their centers set at the vertices on the lines connecting the eccentric axis center O and the vertices of the three corners. Meanwhile, the polishing dish 15
Positioning projections 24, 24, 24 are provided on the upper surface of the mounting plate 16 so as to be fitted with the cylindrical portions 23, 23, 23 when the three corners are aligned with the base 12. Therefore, when the polishing dish 15 is pulled in the direction away from the base 12 against the compression spring 22, each cylindrical portion 23 and the positioning protrusion 24 are pulled.
Are separated from each other and can be freely rotated in that state, and when the polishing dish body 15 is separated at a position where the corners coincide with the base 12,
The polishing dish 15 is moved to the base side 1 by the biasing force of the compression spring 22.
At the same time as moving to 2, the positioning protrusions 24 of the mounting plate 16 are fitted into the three cylindrical portions 23 on the back surface of the base 12,
Both will be integrated. In addition, reference numerals 25, 25, ... Are through holes for collecting dust formed in the polishing dish body 15, and communicate with the dust collecting path 26 between the base 12 and the polishing dish body 15 shown in FIG. It guides dust to the outside.

In the sander 1 constructed as described above, in the state shown in FIG. 1, the base 12 moves in a circular locus by the motor drive, and the sandpaper 18 on the bottom surface of the polishing dish body 15 which moves in unison is used for polishing work. Although it can be done, when the front corner (left side of FIGS. 1 and 2) of the sandpaper 18 is worn away by the polishing work, when the polishing dish body 15 is grasped and pulled downward, the positioning protrusion 24 is formed as shown in FIG. Since the polishing dish body 15 is rotatable away from the respective cylindrical portions 23, the three positioning protrusions 24 are rotated by 120 degrees from this position to the right or left as shown by the arrow in FIG. When the tensile force is loosened by inserting it into the portion 23, the three positioning protrusions 24 are fitted into the tubular portion 23 again as shown in FIG. Part can be used for polishing work . When the second corner is worn out, the polishing dish body 15 may be similarly rotated to change the remaining corner to the place to be used. As described above, in the present embodiment, the use position of the sandpaper 18 can be changed by rotating the polishing dish body 15, so that all three corners of the sandpaper can be used and the surface of the polishing dish body 15 side can be used. Deterioration of the adhesive strength of the fastener is not concentrated in one place. Further, since this change can be performed by a simple rotating operation of the polishing dish, it does not take time or labor and can be accurately performed with good workability.

In the above description, the cylindrical portion 23 used for the locking mechanism is provided on the base 12 side and the positioning protrusion 24 is provided on the polishing dish body 15 side, but they may be provided in reverse to each other. 23 and the positioning protrusion 24 are formed at three positions respectively,
Either one of them may be provided in one corner only. Further, in addition to the cylindrical portion and the positioning protrusion, for example, the flange portion 21 of the cap 20 fixed at a fixed position and the through hole 15a of the polishing dish body 15 are formed into an equilateral triangle or the like, and fitted in both shapes. In the retracted position of the polishing dish body 15, if the fitting is released and the polishing dish body 15 is rotatable, the use place can be changed by the same operation as described above.

[0009]

As described above, according to the present invention, since the polishing dish can be rotated together with the polishing material and locked at a predetermined position, it is possible to easily change the location of use of the polishing material, which saves labor. Further, it is possible to suppress deterioration of the attachment force of the surface fastener or the like on the side of the polishing dish. Further, the positioning can be accurately performed by the locking mechanism that locks at a predetermined position. Further, a locking mechanism is provided respectively on the biasing means for biasing the polishing dish body pivotally supported by the base toward the base side, and on the opposing surfaces of the base and the polishing dish body, respectively. If the engaging portions are engaged with each other only at the forward position of the base, the structure becomes simple and rational.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a polishing portion of a sander.

FIG. 2 is a bottom view of a polishing dish body.

FIG. 3 is an explanatory diagram at the time of rotating the polishing dish.

[Explanation of symbols]

1 ... Sanda, 2 ... Housing, 3 ... Motor, 5 ...
・ Crankshaft, 10 ・ ・ Eccentric shaft, 12 ・ ・ Base, 15 ・ ・ Grinding dish, 16 ・ ・ Mounting plate, 17 ・ ・ Pat, 18 ・ ・ Sandpaper, 20 ・ ・ Cap, 22
..Compression springs, 23..cylindrical parts, 24..Positioning protrusions

Claims (2)

[Claims] 1. A polishing dish body having a bottom surface on which an abrasive material can be mounted is rotatably connected to an output shaft of a motor through a eccentric mechanism so that a base is orthogonally connected to the opposite side of the eccentric mechanism. The sander further comprising: a locking mechanism provided between the base and the polishing dish, the locking mechanism for integrating the polishing dish with the base at a predetermined position. 2. The biasing means for biasing the polishing dish body, which is axially supported by the base and is capable of moving back and forth in the axial direction, with respect to the base, and the base and the polishing dish body. 2. A locking portion which is provided on each of the surfaces facing each other and which engages with each other only at the forward position of the polishing dish toward the base side.
Sanda described in.