JP7576832B2 - Rotary grinding tool - Google Patents

Description

The present invention relates to a rotary abrasive tool, and in particular to a rotary abrasive tool with excellent operability that allows for efficient abrasive work.

Polishing with a rotary polishing tool is performed by rotating a polishing plate, to which an abrasive member such as a buff made of fiber or sponge is attached, using a drive motor and pressing the surface of the abrasive member against the surface to be polished. Rotary polishing tools are classified into vertical and horizontal types depending on the relative positions of the polishing plate and the drive motor housed in the main body. In the vertical type, the drive motor is mounted almost on the axis of the polishing plate's rotation shaft, and the weight of the drive motor is directly applied to the surface to be polished. In the horizontal type, the drive motor is mounted sideways, and the polishing plate's rotation shaft and the drive motor's output shaft are connected at right angles using a bevel gear or the like, so that the weight of the motor is not directly applied to the coating surface.

The vertical rotary polishing tool 20 is shown in Figure 8. The main body 1 of the vertical rotary polishing tool 20 houses the driving motor 3, and the rotating shaft 6 of the rotating disk 7 is directly connected to the output shaft of the driving motor. The rotating disk 7 is equipped with a polishing member 8 such as a buff, forming a polishing disk. The main grip 2 is attached to the rear of the main body 1, and a rod-shaped subgrip 15 is attached to the left side of the main body 1. The polishing work using this rotary polishing tool 20 is performed by holding the main grip 2 with the right hand and the rod-shaped subgrip 15 with the left hand, rotating the rotating disk 7 with the driving motor 3, and pressing the surface of the polishing member 8 against the surface to be polished. The weight of the driving motor 3 is applied to the center of the rotating disk 7 via the rotating shaft 6, and plays a role in pressing the polishing member 8 against the surface to be polished, assisting the polishing action.

In addition, the surface to be polished by the rotary polishing tool is not only a simple flat surface, but is often composed of a three-dimensional curved surface such as the painted surface of a car body, and furthermore, the surface to be polished may not only be a horizontal surface, but also an inclined or vertical surface. In order to deal with such a surface to be polished and press the surface of the polishing member 8 against the surface to be polished, it is necessary to apply forces in each direction of rotation, as shown in FIG. 8, around the central axis (X-axis) of the main grip 2 in the vertical rotary polishing tool 20 (roll), around the central axis (Y-axis) of the rod-shaped subgrip 15 (pitch), and around the central axis (Z-axis) of the rotation shaft 6 (yaw), to press the surface of the polishing member 8 against the surface to be polished.

As described above, in the vertical rotary grinder 20, the weight of the drive motor 3 is applied to the surface to be ground, so it is easy to apply forces in the roll direction with the rod-shaped subgrip 15, forces in the pitch direction with the main grip 2, and forces in the yaw direction with the main grip 2 and rod-shaped subgrip 15. As proposed in Patent Document 1, there is a proposal to improve workability in the grinding process by tilting the central axis of the subgrip at a specific angle (5° to 40°) rearward of the rotation axis with respect to a plane perpendicular to the rotation axis, but this effect is only applicable to vertical rotary grinders.

On the other hand, in the horizontal rotary polishing tool, the driving motor is mounted horizontally, the rotation axis of the polishing plate and the output shaft of the driving motor are connected in a perpendicular direction, and the weight of the motor is not directly applied to the surface to be polished. Therefore, in the horizontal rotary polishing tool 10 shown in FIG. 1, the driving motor is not stored inside the main body 1, and the force equivalent to the weight of the driving motor is not applied to the center of the rotating plate 7 via the rotation axis 6. Therefore, when the subgrip is a rod-shaped subgrip 15 as shown in FIG. 9, the force equivalent to the weight of the driving motor must be added to the force applied by the rod-shaped subgrip 15 at point a, which corresponds to the center of the rotating plate 7. In this case, in order to apply a force at point a, it is necessary to use the couple of forces indicated by the arrow centered on point o in the gripping part, and in order to obtain force Fa at point a, it is necessary to apply force Fb at point b, which is the end of the gripping part, which is a large force Fb that is inversely proportional to the length between points o and a and the length between points o and b. For example, if the force Fa is 50 N, the ao length is 11 cm, and the bo length is 4 cm, taking into account the weight of the drive motor, a force Fb of 137.5 N is required, and it is not easy to apply such a force by twisting the wrist. In this way, with a horizontal rotary grinder 10 equipped with a rod-shaped subgrip 15, the control of the force in the roll direction described above is inefficient, and when applying force in the pitch and yaw directions, a larger force must be applied without the assistance of the weight of the drive motor, making the operation similarly difficult.

On the other hand, as shown in FIG. 10, in the case of a horizontal rotary polishing tool 10, a tongue-shaped subgrip 25 is attached to the front end of the main body of the polishing tool, and a bow-shaped subgrip 35 is attached to the top of the main body, and polishing work is performed by grasping these subgrips. However, when polishing the painted surface of a car body, such as working around exterior parts such as door mirrors, these subgrips get in the way, and the polishing operation is not necessarily easy. Therefore, there is a demand for a rotary polishing tool that allows the polishing operation of pressing the surface of the polishing member to the surface of the polishing member to be performed easily with little force, even on the surface to be polished such as the painted surface of a car body, and allows efficient work.

Japanese Patent Application Publication No. 8-294416

The objective of the present invention is to provide a horizontal rotary grinding tool that is easy to operate and allows grinding work to be performed efficiently.

The horizontal rotary polishing tool of the present invention is a horizontal rotary polishing tool in which the weight of the drive motor is not directly applied to the surface to be polished, and is characterized by having a spherical subgrip with a spherical grip attached to the side of the main body. In this invention, "spherical" means that the surface shape is a sphere, an ellipsoid, or an egg shape, or a shape that is composed of a part of these.

The overall cross-sectional shape of the spherical subgrip in a plane including the central axis is preferably an omega (Ω) shape with a raised periphery at the attachment end, and since the grip is held in the palm of the hand, it is preferable that the maximum diameter is approximately 35 to 60 mm.

Furthermore, it is preferable that the spherical subgrip is attached by screwing a bolt installed on the mounting end surface of the spherical subgrip into a screw hole installed on the side of the main body, and by providing screw holes in at least two places, the mounting position of the spherical subgrip can be adjusted. For example, by providing screw holes on both the left and right sides of the main body, the mounting position can be changed from left to right depending on the worker's dominant hand, and furthermore, it can be adjusted to a position that is easy to operate by moving it closer to the front or rear of the side of the main body depending on the shape of the surface to be polished. It is also preferable that an extension shaft is attached as a rotation axis.

The spherical shape of the gripping portion of the spherical subgrip attached to the side of the main body makes it easy to hold during operation, and the spherical subgrip and the palm holding it make spherical contact similar to the combination of the ball and socket in a ball joint, making it easy to orient the spherical subgrip in any direction in the palm of your hand. The direction of the polishing disc can be adjusted and pressed down effortlessly depending on the shape and condition of the surface to be polished, allowing for efficient polishing work.

Furthermore, because the grip is spherical, it can be held in a variety of ways, and can be changed for long periods of use, making it less tiring to work, and depending on how you hold it, you can use the strength of your arms, making it easier to apply force. Furthermore, because almost the entire area of the palm and the pads of the fingers receive force in a direction perpendicular to each surface, it is possible to feel in real time what moment, position, direction and magnitude of the reaction force from the surface being polished is being applied, allowing you to instantly determine in which direction and how much force to apply to the surface being polished, and control the polishing tool in real time.

In addition, by raising the mounting end of the spherical subgrip and giving it an omega-shaped cross section, the spherical subgrip can be held stably in the palm of the hand, making it easier to operate the grinding tool. And by providing multiple mounting screw holes, the tool can be mounted in a position that is easy for the worker to operate.

And by attaching an extension shaft as a rotating axis, it becomes easier to polish small details, such as the area between the door mirror and the surface of the vehicle body, the number plate attachment area, the top of the bumper, and recessed painted surfaces around the door handles.

FIG. 2 is a perspective external view of a horizontal rotary grinding tool according to the present invention. FIG. 13 is a perspective view of a spherical subgrip having a spherical gripping portion. An explanatory diagram of the reaction force from the polished surface felt by the palm and the pads of the fingers. FIG. 2 is an explanatory diagram of a horizontal rotary grinding tool with an extension shaft attached. An explanatory diagram of applying force using a spherical subgrip. An explanatory diagram of the vertical installation position of the spherical subgrip. FIG. 13 is an explanatory diagram of the forward/rearward mounting position of the spherical subgrip. FIG. 2 is a perspective view of a vertical rotary grinding tool, illustrating the direction of force applied during grinding operation. FIG. 13 is an explanatory diagram showing how force is applied using a rod-shaped subgrip attached to a horizontal rotary grinding tool. 13A to 13C are explanatory diagrams of subgrips of other shapes that can be attached to a horizontal rotary grinding tool.

The following describes an embodiment of the present invention.

Figure 1 is a perspective view of the horizontal rotary polishing tool 10 of the present invention, in which the driving motor 3 is stored sideways in the main grip 2 installed at the rear of the main body 1, and the rotating shaft 6 of the turntable 7 to which the polishing member 8 is attached is connected to the output shaft of the driving motor 3 in a perpendicular direction inside the main body 1 by a bevel gear or the like, so that the weight of the motor is not directly applied to the surface to be polished. In the horizontal rotary polishing tool 10, a spherical subgrip 5 with a spherical grip is attached to the left side of the main body 1. As shown in Figure 2, the grip 51 of the spherical subgrip 5 is spherical, and the periphery of the mounting end 52 is raised, and the overall cross-sectional shape in a plane including the central axis of the subgrip 5 is omega-shaped.

Because the gripping portion 51 of the spherical subgrip 5 is spherical, it is easy to grip the spherical subclip 5 during polishing operations, and as shown in FIG. 3, almost the entire area of the palm and the pads of the fingers receives force in a direction perpendicular to each surface. Therefore, as described above, the spherical subgrip 5 and the palm gripping it make spherical contact similar to the combination of a ball and socket in a ball joint, making it possible to feel the reaction force from the surface to be polished in real time, making it easy to orient the spherical subgrip 5 in any direction in the palm, and allowing the direction of the polishing disk to be adjusted and pressed comfortably according to the shape and situation of the surface to be polished, thereby achieving efficient polishing operations. Furthermore, the peripheral edge of the attachment end 52 is raised, and the overall cross-sectional shape of the spherical subgrip 5 is made omega-shaped, providing the function of a grip end, and the spherical subgrip 5 can be stably gripped in the palm, making the polishing operation stable.

Figure 4 shows an example in which the rotating shaft 6 is an extension shaft 16 for polishing the area between the door mirror and the surface of the vehicle body, or the periphery of exterior parts such as license plates. By attaching an extension shaft 16 as the rotating shaft in this way and extending the rotating shaft to 7 cm to 40 cm, it is possible to polish the surface paint of the vehicle body while avoiding exterior parts that would be an obstacle to the polishing work. Even when using an extension shaft 16 as the rotating shaft, by using a spherical subgrip 5, it is possible to control the force applied to the surface to be polished even in these narrow spaces, allowing the polishing work to be performed efficiently.

Figure 5 is an explanatory diagram of applying force by a spherical subgrip 5 attached to a horizontal rotary polishing tool 10. As for the problem of applying force when a rod-shaped subclip 15 is attached to a horizontal rotary polishing tool 10, as described above based on Figure 9, a larger force is required in the roll direction, making the operation difficult, and when applying force in each direction of pitch and yaw, there is no assistance from the weight of the driving motor, making the operation difficult. In contrast, when a spherical subgrip 5 is attached, as shown in Figure 5, by pressing the top surface of the main body 1 with the thumb and applying force, the force applied to the rotating shaft 6 at point a can be made a couple in the direction of the arrow centered on point o, and the effect of a lever can be utilized. Therefore, force can be applied to the surface to be polished through the rotating shaft 6 without requiring a large force as in the case of the rod-shaped subgrip 15 shown in Figure 9.

The spherical subgrip 5 is attached to the main body 1 by screwing the bolt 53 attached to the attachment end 52 shown in FIG. 2 into a screw hole attached to the side of the main body 1. A plurality of screw holes are provided, and the attachment position is adjusted according to the shape and condition of the surface to be polished. FIG. 6 shows the vertical attachment range of the spherical subgrip 5 on the main body 1, and the spherical subgrip 5a attached to the upper limit position is attached so that its upper end is located at a distance of L ₂ from the upper surface of the main body 1, and the spherical subgrip 5b attached to the lower limit position is attached so that its lower end is located at a distance of L ₁ from the polishing surface of the polishing member 8. L ₁ is a distance of 30 mm, and L ₂ is a distance of 10 mm, and as shown in FIG. 5, L ₁ is the distance at which a finger can be inserted between the spherical subgrip and the surface to be polished, and L ₂ is the distance at which the thumb can hold down the upper surface of the main body 1. Figure 7 shows the attachment range of the spherical subgrip 5 in the front-rear direction on the main body 1, with the spherical subgrip 5c attached to the front limit being attached at a position where its front end coincides with the front end 1a of the main body, and the spherical subgrip 5d attached to the rear limit being attached at a position where it coincides with the center line 6a of the rotation shaft 6. Figure 7 shows an example in which the spherical subgrip is provided on the left side of the rotary grinder, but it may also be attached to the right side.

Furthermore, it is preferable that the central axis of the spherical sub-grip 5 is attached at an angle of 45° to 90° with respect to a plane including the central axis of the main grip 2 and the central line 6a of the rotation shaft 6. The spherical sub-grip 5 is attached to the main body 1 by providing a screw hole within the above-mentioned range of the main body 1, and it is preferable that at least two screw holes are provided within this range so that the attachment position of the spherical sub-grip 5 can be adjusted according to the dominant hand of the worker and the surface to be polished.

As described above, the horizontal rotary polisher equipped with the spherical subgrip of the present invention is a rotary polisher with excellent operability that allows polishing work to be performed efficiently.

REFERENCE SIGNS LIST 10 Horizontal rotary grinding tool 20 Vertical rotary grinding tool 1 Body 2 Main grip 3 Driving motor 5 Spherical subgrip 51 Grip portion 52 Mounting end portion 53 Bolt 6 Rotating shaft 7 Rotating disk 8 Grip member 9 Power cord 15 Rod-shaped subgrip 16 Extension shaft 25 Tongue-shaped subgrip 35 Bow-shaped subgrip Fa, Fb Force

Claims (5)

A horizontal rotary polishing tool in which the weight of a drive motor is not directly applied to the surface to be polished, the horizontal rotary polishing tool being characterized in that a spherical subgrip, the gripping portion of which is spherical and has a maximum diameter of 35 to 60 mm , is attached to the side of the main body in such a manner that the upper limit position in the vertical direction is a position where the upper end of the spherical subgrip is 10 mm away from the upper surface of the main body, the lower limit position in the vertical direction is a position where the lower end of the spherical subgrip is 30 mm away from the polishing surface of a polishing member attached to a turntable, the forward limit position in the front-rear direction is a position where the front end of the spherical subgrip coincides with the front end of the main body, and the rear limit position in the front-rear direction is a position where the front end of the spherical subgrip coincides with the center line of the rotation shaft , and further, the central axis of the spherical subgrip is attached at an angle of 45° to 90° with respect to a plane including the central axis of the main grip and the center line of the rotation shaft, and by applying force while holding down the upper surface of the main body with the fingers of the hand holding the spherical subgrip, a force can be applied to the surface to be polished via the rotation shaft .
The horizontal rotary grinding tool according to claim 1, characterized in that the overall cross-sectional shape of the spherical subgrip in a plane including the central axis is an omega shape with a raised periphery at the attachment end. The horizontal rotary grinding tool according to claim 1 or 2, characterized in that the spherical subgrip is attached by a bolt installed on the mounting end face of the spherical subgrip being screwed into a screw hole installed on the side of the main body. The horizontal rotary grinding tool according to claim 3, characterized in that the screw holes are provided in at least two places, and the mounting position of the spherical subgrip is adjustable. 5. The horizontal rotary grinding tool according to claim 1, further comprising an extension shaft attached as a rotation axis.

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