JPH0330092Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a grinding head in which a grinding tool is detachably attached to the tip of a moving shaft that moves linearly back and forth in the thrust direction when the drive shaft is rotated. It is about the mechanism.

(Prior art) Conventionally, in a grinding head in which a moving shaft to which a grinding tool is attached moves linearly back and forth in the thrust direction when the drive shaft is rotated, it is difficult to attach or detach the grinding tool to the moving shaft or to move the moving shaft of the mounting member of the grinding tool. Attachment and detachment is performed by attaching and detaching a screw to the moving shaft (see Utility Model Application No. 59-70322).

(Problem to be solved by the invention) For this reason, it becomes complicated to attach and detach the grinding tool to the moving shaft, or to attach and detach the mounting member of the grinding tool to the moving shaft, and as a result, there is a problem that the tooth grinding efficiency is reduced. It was hot.

The present invention makes it possible to easily attach and detach the grinding tool to and from the moving shaft, and to attach and detach the mounting member of the grinding tool to and from the moving shaft with a so-called one-touch operation.
As a result, it is an object of the present invention to provide a mechanism for attaching and detaching a cutting tool of a grinding head, which improves tooth grinding efficiency.

(Means for Solving the Problems) The present invention provides a spring member with a moving shaft having an insertion hole formed in a direction intersecting the center line, and a pushing body having an insertion hole formed in a direction intersecting the center line. The grinding tool is biased in opposite directions by the moving shaft and inserted into the insertion hole of the pushing body, and the grinding tool is removably fixed by the moving shaft and the pushing body. be.

(Embodiment) FIGS. 1 and 2 show the structure of a grinding head equipped with an embodiment of the present invention, in which 1 is rotatably installed inside a sleeve 3 via a bearing 2. The drive shaft 4 is a gear fixed to the rear end of the drive shaft 1, and when the sleeve 3 is inserted into the tip of the hand piece (not shown), the gear 4 is rotatably installed inside the hand piece. , the rear end meshes with a gear (not shown) fixed to the tip of a drive shaft (not shown) connected to a drive source (not shown).
5 is a cylindrical cam integrally provided at the tip of the drive shaft 1;
7 is an endless cam groove formed on the outer peripheral wall of the cylindrical cam 5 so as to be inclined with respect to the thrust direction, and 7 is a guide cylinder having a guide groove 8 recessed in the inner peripheral wall of the tip end in the thrust direction. It is fixed to the tip of the sleeve 3 with a screw 9. 10 is a cylinder hole 1 in the partition wall between the front cylinder hole 11 and the rear cylinder hole 12.
A through hole 13 having an inner diameter smaller than the inner diameter of each of tube holes 1 and 12 is formed, and through holes 14 are formed in the tube wall at the tip end of the cylindrical hole 11 symmetrically in a direction intersecting the center line.
This is a moving shaft in which a through hole 15 is bored in the tube wall at the rear end of the cylindrical hole 12, and the rear part of this moving shaft 10 moves in the thrust direction between the cylindrical cam 5 and the guide tube 7. Interventions are made where possible. Reference numeral 16 denotes a ball inserted into the through hole 15. A portion of the ball 16 that protrudes toward the center from the inner circumferential wall surface of the moving shaft 10 is engaged in the cam groove 6, and a portion radiating from the outer circumferential wall surface of the moving shaft 10 is inserted into the cam groove 6. The portion projecting in the direction is engaged in the guide groove 8. Reference numeral 17 denotes a pushing body having an insertion hole 18 formed in a direction intersecting the center line, and this pushing body 17 is inserted into the cylindrical hole 11 and the through hole 13 of the moving shaft 10 so as to be movable in the thrust direction. 19 is the pushing body 1
A retainer fixed to the rear end of 7, 20 a moving shaft 10
The spring 20 is interposed between the pushing body 17 and the pushing body 17, and the spring 20 biases the pushing body 17 forward (leftward in the figure) by its stretching force.

In this embodiment configured in this way, first, it is inserted into the tip of a handpiece (not shown), and
The pushing body 17 of the grinding head, in which the gear 4 is meshed with the gear of the handpiece, is pushed backward (toward the right in the figure) with the user's finger against the tension of the spring 20.
After moving, the handle of the grinding tool 21 is inserted into the insertion hole 14 and the insertion hole 18 whose center lines substantially coincide with each other, and the finger is released from the pushing body 17. Then, the pushing body 1
7 moves forward by the tension of the spring 20,
The inner peripheral wall surface of the insertion hole 14 and the inner peripheral wall surface of the insertion hole 18 are in contact with the handle of the grinding tool 21, respectively, and the moving shaft 1
The handle of the grinding tool 21 is fixed to the tip of the grinding tool 21 (see FIG. 2).

Next, when you rotate the drive shaft of the handpiece,
A cylindrical cam 5 rotates together with the drive shaft 1, and a ball 16 whose moving direction is regulated by a guide groove 8
is linearly transferred back and forth in the thrust direction by the cam groove 6, so the moving shaft 10 moves linearly back and forth in the thrust direction as the ball 16 moves. Therefore, the grinding tool 2 fixed to the tip of the moving shaft 10
1 is rubbed against the workpiece, the workpiece can be ground by the grinding tool 21 that linearly moves back and forth in the thrust direction.

FIG. 3 shows the configuration of the tip of a grinding head equipped with another embodiment of the present invention, and the same reference numerals as those in FIGS. 1 and 2 indicate the same parts. Further, 22 is an insertion hole bored at the tip of the moving shaft 10 in a direction intersecting the center line;
23 is the insertion hole 2 at the tip of the moving shaft 10.
A pin hole 24 is formed in the rear part of 2 in a direction intersecting the center line, and an insertion hole 26 is formed symmetrically in the direction intersecting the center line in the distal end tube wall of the cylindrical hole 25, and
This is a cylindrical pushing body with a bottom in which a guide hole 27 is formed symmetrically in the thrust direction in the tube wall at the rear end of the cylindrical hole 25, and this pushing body 24 is movable in the thrust direction at the tip of the moving shaft 10. It is exteriorized with. 28 is a pin inserted into the pin hole 23 while passing through the guide hole 27; 29 is a spring interposed between the pusher 24 and the pin 28; 24 forward (leftward in the figure).

In this embodiment configured in this way, first, it is inserted into the tip of a handpiece (not shown), and
The pushing body 24 of the grinding head, in which the gear 4 is meshed with the gear of the handpiece, is pushed backward (toward the right in the figure) with the user's fingers against the tension of the spring 29.
After moving the handle, insert the handle of the grinding tool 21 into the insertion hole 22 and the insertion hole 26 whose center lines substantially coincide with each other, and then release the finger from the pushing body 24. Then, the pushing body 2
4 moves forward by the tension of the spring 29,
The inner peripheral wall surface of the insertion hole 22 and the inner peripheral wall surface of the insertion hole 26 are in contact with the handle of the grinding tool 21, respectively, and the moving shaft 1
The handle of the grinding tool 21 is fixed to the tip of the grinding tool 21.

Next, when you rotate the drive shaft of the handpiece,
As explained in the above embodiment, since the moving shaft 10 linearly moves back and forth in the thrust direction, the moving shaft 10
If the grinding tool 21 fixed to the tip of the grinding tool 21 is rubbed against the workpiece, the workpiece can be ground by the grinding tool 21 that linearly moves back and forth in the thrust direction.

In addition, mounting parts for grinding tools such as strips, etc.
The insertion holes 14 and 18 or the insertion hole 22 are provided in the upper part.
If you provide a handle that can be inserted into 26 and 26,
It can be attached to the tip of the moving shaft 10 with one touch.

(Effects of the invention) As explained above, according to the invention, the grinding tool can be attached and detached from the moving shaft, and the attachment member of the grinding tool can be attached and detached from the moving shaft with a single touch, thereby improving tooth grinding efficiency. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a grinding head equipped with an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the front part of the moving shaft when a grinding tool is fixed to the moving shaft according to an embodiment of the present invention. FIG. 3 is a sectional view of the front part of a moving shaft provided with another embodiment of the present invention. 1... Drive shaft, 10... Movement axis, 14, 18,
22, 26...insertion hole, 17,24...pushing body,
20, 29... Spring, 21... Grinding tool.

Claims (1)

[Scope of utility model registration request] In a grinding head, in which a moving shaft to which a grinding tool is attached moves linearly reciprocally in a thrust direction when the drive shaft rotates, the moving shaft has an insertion hole drilled in a direction intersecting a center line through which the grinding tool is inserted;
a pushing body that has an insertion hole through which the grinding tool is inserted in a direction intersecting the center line, and is attached to the tip of the moving shaft so as to be movable in the thrust direction;
The moving shaft and the pushing body are biased in opposite directions so that the grinding tool inserted into the insertion hole of the moving shaft and the insertion hole of the pushing body can be freely attached and detached by the moving shaft and the pushing body. A cutting tool attachment/detachment mechanism for a grinding head, characterized in that it is equipped with a spring member that fixes the cutting tool to the grinding head.