KR20010036951A - Portable disc sander - Google Patents

Abstract

PURPOSE: A mobile grinder is provided to freely move and arrange the grinder by comprising a circular device capable of freely rotating at peripheral part of an output shaft driven directly or indirectly and mounting a grinding ring on an eccentric shaft. CONSTITUTION: The grinder comprises an output shaft(1), an eccentric shaft(13) and a grinding ring(20) able to be easily attached and removed from the shaft(13). The eccentric shaft(13) has a hook part(13a) at peripheral part of the shaft. The output shaft has another hook part to move forward or backward to the part(13a). On the peripheral part of the output shaft(1), a rotating circular device(9) is equipped and rotates to push the hook part toward the core of the shaft to allow secure it to the hook part(13a), thereby makes the output shaft(1) and the eccentric shaft(13) integrated.

Description

Portable Polisher {PORTABLE DISC SANDER}

According to the present invention, the shaft of the polishing tool (polishing pad) is eccentrically mounted on an output shaft driven by a motor using electricity or air as a power source, and the rotating shaft is freely mounted, and the shaft of the polishing tool is integrally coupled to the output shaft. The present invention relates to a portable polishing machine that can be freely switched to a state in which it can freely rotate.

The schematic structure of a known portable grinding machine will be described with reference to the drawings described in Japanese Unexamined Patent Application Publication No. 48-35191. Fig. 4 is an enlarged view of a part of the portable grinding machine, and Figs. 5 and 6 show the main parts of Fig. 4. It is also a cross section.

In the drawing, the portable polishing machine includes a drive shaft (integrated output shaft) 101 driven by a motor using electricity, air, or the like as a power source, and the boss 104 has a screw 105 or the like on the drive shaft 101. It is fixed integrally with the fixing means of. In the boss 104, the shaft 103 of the polishing tool 102 is rotatably axially supported by the bearing 114 in an eccentric state, and the drive shaft 101 and the shaft 103 are mutually supported by switching means described later. It is a structure which can switch freely to the state which united together and the free state which rotates freely with each other.

The switching means has a counterweight (107), which counterweight (107) is attached to the boss (104) to be able to rotate within a certain range by the shaft (103) and the other eccentric shaft (106) have. The counterweight 107 is detachably fitted to the engagement hole 108 formed on the outer periphery of the shaft 103 of the polishing tool 102 to secure the boss 104 and the shaft 103 at the time of fitting. Dowel pins 109 are provided.

On the shaft 103 side of the counterweight 107, as shown in FIG. 5, an arc-shaped groove 110 having the same center as the shaft 106 is formed, and the boss 104 is formed in the arc-shaped groove 110. By inserting the pin 111 protruding so as to be able to flow to limit the range of rotation of the counterweight 107, and between the counterweight 107 and the boss 104, a spring elastically supported with the hole, The click stop device 112 which consists of two recesses is provided. The click stop device 112 is fitted into the engaging hole 108 formed by the engaging pin 109 on the shaft 103 and is removed from the engaging hole 108 to temporarily remove the counterweight 107. It is the structure which can position the state which can stop.

In the above grinding machine, when the engaging pin 109 of the counterweight 107 is engaged with the engaging hole 108 of the shaft 103 (FIG. 5 state), the boss 104 and the polishing tool 102 The shaft 103 is integrally coupled, and when the drive shaft 101 is turned by the motor, the boss 104 rotates together with the drive shaft 101, and the shaft 103 of the grinding tool 102 also moves together with the boss 104. Rotate Therefore, the grinding | polishing tool 102 grinds the to-be-processed surface which performs the rotational movement with respect to the drive shaft 101 with the drive shaft 101 (single acting).

When the engagement pin 109 of the counterweight 107 is pulled out of the engagement hole 108 of the shaft 103, the drive shaft 101 is freely rotatable with respect to the shaft 103. When the polishing tool 102 is pressed onto the work surface and the drive shaft 101 is rotated by the motor, the shaft 103 continues to revolve around the axis of the drive shaft, accompanied by the rotation of the boss 104. The grinding | polishing tool 102 performs an eccentric motion which rotates (double acting).

As described above, in the present polishing machine, a single-acting state in which the polishing tool 102 is integrally fixed to the boss 104 from the relationship between the engagement pin 109 and the engagement hole 108, and the polishing tool (for the boss 104). 102 can be appropriately divided into double acting states which can be freely rotated. In the figure, “113” is a rotary bar for rotating the counterweight 107.

However, in the portable grinding machine,

The counterweight 107 as a switching means for switching between the double-acting state and the single-acting state is mounted on the boss 104 so that the counterweight 107 can be rotated within a predetermined range by the other eccentric shaft 106 using the rotary movement rod 113. In addition, the configuration is complicated, the number of components is large, and the cost is disadvantageous. When switching from the double acting state to the single acting state, a tool (rotating rod) 113 for rotating the counterweight 107 is required. In order to fit the engagement pin 109 of the counterweight 107 into the engagement hole 108, the position of the engagement pin 109 and the engagement hole 108 needs to be aligned while rotating the grinding | polishing tool side. There is a problem, such as troublesome switching operation.

Therefore, the present invention provides an eccentricity in which an annular member is rotatably provided on the outer periphery of an output shaft driven directly or indirectly by a motor, and an engaging member capable of moving back and forth in the axial direction by rotating the annular member is eccentrically installed on the output shaft. It is an object of the present invention to solve a problem of the conventional portable polishing machine by adopting a structure capable of being fixed to an engaging portion formed on the outer circumference of the shaft (corresponding to the shaft 103 of the conventional apparatus).

According to the present invention having the above-described configuration, it is possible to easily switch between double-acting and single-acting states without a tool by simply holding the annular member rotatably attached to the output shaft and the output shaft with both hands and relatively rotating operation. Since the annular member is provided with a rotation stop mechanism that also serves as positioning, it is possible to reliably perform double-acting and single-acting switching operations easily. In addition, since the friction member is disposed, the friction member maintains the state where the engaging member is released from the engaging hole by the centrifugal force generated by the rotation of the output shaft when the annular member is rotated to switch from the single-acting state to the double-acting state. Can be.

Technical solution employed by the present invention for achieving the above object,

A portable grinding machine which is detachably attached to an eccentric shaft which is freely attached to a eccentric shaft which is rotatably installed in a state eccentric with respect to an axis of the output shaft directly or indirectly driven by a motor. And a fastening member which is formed on the output shaft to be fastened to the fastening portion, can be freely moved forward and backward, and an annular member is rotatably provided on the outer circumference of the output shaft, and the annular member is rotated so as to Push the engaging member in the axial center direction and fix it to the engaging part to integrate the output shaft and the eccentric shaft, and push the engaging member in the centrifugal direction to release it from the engaging part to switch the output shaft and the eccentric shaft to the free state. Mobile which was installed by possible Dragon polishing

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partially broken side view of a portable polishing machine of the present embodiment.

2 is an enlarged cross-sectional view of the output shaft of the portable polishing machine.

Fig. 3 is a cross-sectional view of the arrow A-A in Fig. 2, wherein (a) is a diagram illustrating switching between double-acting and (b) single-acting state of the portable polishing machine.

Figure 4 is a partially broken side view of a conventional portable polishing machine.

Fig. 5 is an enlarged transverse cross-sectional view of a single acting state showing the main part of Fig. 4.

FIG. 6 is an enlarged transverse cross-sectional view of a double acting state showing the main part of FIG. 4. FIG.

※ Explanation of code for main part of drawing

1: output shaft 2, 4: bevel gear

3: drive shaft 5: housing

6: set screw 7, 18: bearing

8: oil seal 9: annular member (lock ring)

10: snap ring 11: lock groove

12: engagement member (engagement pin) 13: eccentric shaft

13a: engaging portion (engaging recessed portion) 14: friction member

15: rotation stop member 20: grinding tool

21: lever

Referring to the drawings, the portable polishing machine according to the present invention will be described. FIG. 1 is a partially broken side view of the portable polishing machine according to the present embodiment, FIG. 2 is an enlarged cross-sectional view of the output shaft of the portable polishing machine, and FIG. 3 is an AA arrow in FIG. (A) is double acting and (b) is explanatory diagram of switching in single acting state.

In the drawing, "1" is an output shaft, and a bevel gear 2 is press-fit fixed to this output shaft 1, and the bevel gear 4 is press-fixed and fixed to the drive shaft 3 of the motor. Interlocked. The output shaft 1 is fixed to the housing 5 of the motor by a fixing screw 6 which is screwed to the motor housing 5 and is freely supported by the bearings 7a and 7b arranged in the housing 5. It is. Grease is sealed in the housing 5 around the bevel gears 2 and 4, and oil leakage is prevented by the oil seal 8 provided on the inner circumference of the fixing screw.

As shown in an enlarged view in FIG. 2, the output shaft 1 has a large diameter portion 1A at its lower end, and an annular member (lock ring) 9 is provided at the upper end of the large diameter portion 1A with a snap ring 10. Is rotatably attached in the state where the fall prevention is prohibited, and the lock groove 11 whose depth changes gradually is formed in the inner periphery of the lock ring 9 as shown in FIG. At the position corresponding to the lock groove 11 of the output shaft 1, as shown in Figs. 2 and 3, the engaging member (engaging pin) 12 is freely moved forward and backward in the axial direction of the eccentric shaft 13. When the engagement pin 12 is positioned in the shallowest portion of the lock groove 11 and is fitted through the (1b) side, the engagement pin 12 is pushed out in the axial direction to be described later. The engagement pin 12 is fixed to the engagement portion (engagement recess portion) 13a formed in the engagement portion. The engaging pin 12 has a needle shape in which both ends are spherical. Moreover, when the engagement pin 12 is located in the deepest part of the lock groove 11, the engagement pin 12 will move outward from the axial center direction of the eccentric shaft 13, and will be formed in the eccentric shaft 13 The engagement pin 12 is pulled out from the engagement recess 13a, and the engagement pin 12 is released.

The output shaft 1 positioned between the lock ring 9 and the engagement pin 12 abuts against and is provided with a friction member 14 made of rubber or plastic that regulates the movement of the engagement pin 12. 2 (see FIG. 2), the engagement pin 12 is freely moved forward and backward by the frictional force of the friction member 14. In addition, the output shaft 1 is provided with a rotation stop member 15 made up of a hole 15a and a spring 15b. The state where the engagement pin 12 has escaped from the engagement recess 13a, and the state where the engagement pin 12 has escaped from the engagement recess 13a, and the second recessed part 17, are engaged with the engagement recess 13a. (12) locks the fitted state. In this way, only the rotation of the locking ring 9 and the engagement recess 13a and the engagement pin 12 can be selected easily by the state of locking and releasing.

At the lower end of the large diameter portion 1A of the output shaft 1, an eccentric recess 1B for accommodating the eccentric shaft 13 is formed, and the eccentric shaft 13 is formed on the eccentric recess 1B. In the state eccentric with respect to the shaft center (the amount of eccentricity is ΔS), the bearing 18 is freely supported. One end of the bearing 18 is fixed to the end of the output shaft 1 and the other end is fixed by a snap ring 19a provided on the eccentric recess 1B. The eccentric shaft 13 is fitted to the bearing 18 by an end formed on the outer circumference of the eccentric shaft 13 and a snap ring 19b. On the outer circumference of the innermost part of the eccentric shaft 13 which protrudes from the bearing 18 and intrudes into the recess 1B, the engaging recess 13a, which is engaged with the engaging pin 12, is fixed at an equal pitch 6. The position is formed, and the engagement pin 12 and the engagement recess 13a can be aligned by the slight rotation amount of the eccentric shaft 13. In addition, the engaging recess 13a can be increased or decreased as necessary, and the engaging recess 13a has a shape that can be fixed by engaging the engaging pin. Branches can be adopted.

A screw hole 13b is formed at the center of the eccentric shaft 13, and the screw hole 13b is screwed into the grinding hole 13b so that it can be detachably fixed to the eccentric shaft 13. It is. Also, on the outer circumference of the large diameter portion of the eccentric shaft 13, an equilibrium surface for stopping the rotation of the eccentric shaft 13 by a spanner or the like is formed. The pad 20 can be attached and detached easily. At this time, if the output shaft 1 and the eccentric shaft 13 are left integrated, attachment and detachment can be easily performed by relatively rotating the output shaft 1 and the polishing pad 20 with both hands without using a spanner.

In addition, the cover 21 is attached to the motor side around the output shaft 1 in a state where the output shaft 1 having the above-described configuration is fitted to the motor housing 5. The drive lever 22 of the motor is provided above the motor housing.

The operation of the portable polishing machine constructed as described above will be described.

In the case of double acting with the above-mentioned grinder, the output shaft 1 and the locking ring 9 are relatively rotated with both hands, and the output shaft 1 and the locking ring 9 are relatively rotated. As shown in FIG. When the innermost part of the lock groove 11 formed in the inner circumference of the lock groove 11 and the engaging pin 12 face each other, the rotation stop member 15 is formed in the first concave portion 16 on the lock ring 9 side. The lock ring 9 and the output shaft 1 are fixed by fitting. At this time, the engagement pin 12 is freely moved in the axial direction by the friction member 14. In this state, when the drive lever 22 of the motor is lowered, the rotation of the drive shaft 3 is beveled. It is transmitted to the output shaft 1 via the gears 4 and 2, and the output shaft 1 rotates. The centrifugal force acts on the engagement pin 12 by the rotation of the output shaft 1, and the engagement pin 12 moves outward by overcoming the frictional force of the friction member 14, and the lock groove of the lock ring 9 inner circumference. The engagement pin 12 is located at the deepest part of (11). In this way, the fastening of the engaging recess portion 13a of the engaging pin 12 and the eccentric shaft 13 is released, and the output shaft 1 and the eccentric shaft 13 are freely rotatable with each other, and the output shaft ( Accompanying the rotation of 1), the eccentric shaft 13 revolves around the axial center of the output shaft 1. In this state, the polishing pad 20 is pressed against the workpiece to polish the surface of the workpiece. At this time, since the engagement pin 12 is pressed against the deepest part of the lock groove 11 more strongly by the centrifugal force, double acting is surely performed.

In addition, in the case of single-acting with the above-mentioned polishing machine, the lock groove formed on the inner circumference of the lock ring 9 is rotated relatively to the output shaft 1 and the lock ring 9 as opposed to double acting. When the shallowest part of 11) is positioned opposite to the engagement pin 12, the rotation stop member 15 fits into the second concave portion 17 on the lock ring 9 side, so that the lock ring 9 and Fix the output shaft (1). By the action of this shallowest part, the engagement pin 12 is pushed out in the axial direction of the eccentric shaft 13, and is fixed to one of the engagement recesses 13a formed in the outer periphery of the eccentric shaft 13; . As a result, since the output shaft 1 and the eccentric shaft 13 are fixed together, the rotation of the motor drive shaft 3 is transmitted through the bevel gears 4 and 2, and the output shaft 1 and the eccentric shaft ( 13 is integrally rotated, and the polishing pad 20 polishes the surface of the workpiece to perform a rotational movement about the output shaft 1 together with the output shaft 1. In addition, since the engagement recess 13a is formed in the eccentric shaft 13 in this example in six places, even if the engagement pin 12 and the engagement recess are slightly shifted, it can be easily hooked and fixed.

As described above, in the present polishing machine, a single-acting state in which the polishing pad is integrally fixed to the output shaft 1 and the output shaft 1 is polished by simply holding both hands and rotating the output shaft 1 and the lock ring 9 relatively. The pad can be easily switched to a double acting state in which the pad can be freely rotated.

It should be noted that the lock groove 11, the engagement pin 12, and the rotation stop member 15 formed on the lock ring 9 can be used in a different shape or form to achieve the same function. As long as the member 14 can also regulate the free movement of the engagement pin 12, it is also possible to use another form. In addition, the engagement recess 13a formed in the eccentric shaft 13 can also be arranged outside the bearing 18 holding the eccentric shaft 13 (downward in FIG. 2), The position of the pin 12, the position of the lock ring 9, etc. can also be arrange | positioned against the lower end part of the output shaft 1. As shown in FIG.

In addition, this invention can be implemented in other various forms, without deviating from the mind or main characteristics, and the Example mentioned above is only a mere illustration in all the points, and should not interpret it limitedly.

As described in detail above, according to the present invention, the annular member rotatably attached to the outer circumference of the output shaft and the double-axis and single-acting states can be easily switched without a tool simply by holding the output shaft with both hands and performing relatively rotational operation. This is good. Since the annular member is provided with a rotation stop member which also serves as a positioning. It can be locked reliably at the switching positions of double acting and single acting during use. In addition, since the friction member is disposed between the annular member and the engaging member, it is possible to achieve an excellent effect such that the locking ring can be rotated to reliably perform single-acting and double-acting switching operations.

Claims (3)

A portable grinding machine which is detachably attached to an eccentric shaft which is freely attached to a eccentric shaft which is rotatably installed in a state eccentric with respect to an axis of the output shaft directly or indirectly driven by a motor. And a fastening member which is formed on the output shaft to be fastened to the fastening portion, can be freely moved forward and backward, and an annular member is rotatably provided on the outer circumference of the output shaft, and the annular member is rotated so as to Push the engaging member in the axial center direction and fix it to the engaging part to integrate the output shaft and the eccentric shaft, and push the engaging member in the centrifugal direction to release it from the engaging part to switch the output shaft and the eccentric shaft to the free state. Mobile which was installed by possible Dragon polishing. The method of claim 1, Portable polishing machine, characterized in that the rotation stop member is provided between the output shaft and the annular member. The method according to claim 1 or 2, Portable polishing machine, characterized in that the friction member is provided between the engaging member and the annular member.