JPH0717292Y2 - Handpiece attachment / detachment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is intended to easily and surely attach / detach a handpiece of a hand-held processing device to a motor unit. Further, it can be used for dental treatment, dental technique, various metal workings, and other relatively precise cutting and polishing.

2. Description of the Related Art Conventionally, there are hand-held processing devices used for dental treatment, dental technique, various metal workings, and other relatively precise cutting and polishing. Among these, there are those in which the handpiece and the motor unit are integrated, and those in which the handpiece and the motor unit are formed separately and are detachable.

The problem to be solved by the invention And, the one in which the handpiece and the motor part are integrally formed has a drawback that the handpiece and the motor have to be prepared for each work purpose, which is expensive.

Further, there is a device described in Japanese Utility Model Publication No. 58-22728 in which these are separated and the handpiece can be exchanged for each work purpose.

However, in this invention, the steel ball provided on one side is engaged with the annular groove on the other side to connect the handpiece and the drive unit.

In this conventional method, the handpiece and the drive unit are rotatable, and the connection is unstable, so that the handpiece and the drive unit cannot be stably connected to a state close to a rigid body. For this reason, it is inconvenient for work that requires frequent replacement, and the connection of the handpiece to the motor unit is uncertain, which often causes loosening and the like.

The present invention is intended to solve the above problems, and is intended for dental treatments, dental technicians, various metal workings,
In addition, in a hand-held processing device used for relatively precise cutting and polishing, the handpiece and the motor part are formed separately. Then, the handpiece and the motor portion can be freely attached and detached, and the handpiece replacement work can be performed quickly, without impairing the workability. Further, the handpiece is securely connected to the motor to prevent loosening and the like.

Means for Solving the Problems In order to solve the above problems, the present invention urges an outer cylinder slidably mounted on the outer circumference of the inner cylinder with a pressing spring having one end fixed to the inner cylinder. The pressing taper surface formed on the inner circumference of the outer cylinder in the pressing direction is pressed against the arcuate surface of the pressing body, and the pressing body penetrates through the engagement opening of the inner cylinder and is fitted so as to be movable in the penetrating direction. , A pressure receiving taper surface is formed on the outer circumference of the motor case that is slidably inserted into the inner circumference of the inner cylinder in a direction in which the pressing taper surface intersects with the extension direction, and the arcuate surface of the pressing body contacts the pressure receiving taper surface A pressing taper surface with a larger diameter in the rear end direction is formed on the inner circumference of the inner cylinder in the rear end direction while pressing, and this tightening taper surface is slidably pressed against the outer peripheral taper surface of the motor case. It consists of

Further, the pressing body may be formed in a spherical shape.

Function In the above-mentioned configuration, in order to connect the handpiece and the motor case, which are located separately, first,
The outer cylinder is pushed and slid by hand in the handpiece direction against the restoring force of the spring to release the pressing force of the outer cylinder against the pressing body fitted in the engagement port. And inside the inner cylinder of the handpiece,
If the tip of the motor case is inserted, the pressing body is pushed out in the outer cylinder direction on the outer periphery of the motor case. By this extrusion, the pressing body brings the pressing tapered surface of the outer cylinder into contact with the arcuate surface.

Then, when the motor case is further inserted into the inner cylinder, the pressing body comes into contact with the pressure receiving tapered surface of the motor case.

Next, when the manual pressing of the outer cylinder in the handpiece direction is released, the outer cylinder is pressed and urged to the side opposite to the handpiece by the restoring force of the pressing bar.

The pressing taper surface formed on the inner circumference of the outer cylinder in the pressing bias direction biases the pressing body inward of the inner cylinder.
By this urging, the pressing body presses the pressure receiving tapered surface of the motor case with the arcuate surface.

The pressure receiving taper surface is formed in a direction in which the pressing taper surface and the extension direction intersect. Therefore, the pressing body changes the pressing biasing direction by the inclination of the pressure receiving taper surface, and exerts a force for pressing the pressure receiving taper surface in the inner peripheral direction and a force for pressing the inner cylinder in the rear end direction via the engagement port. Occurs. Then, when a pressing bias is applied by the pressing tapered surface, the pressing body further strongly presses the pressure receiving tapered surface in the inner circumferential direction and engages with the pressure receiving tapered surface to prevent the handpiece and the motor case from being separated from each other. .

Further, the tightening taper surface on the inner circumference in the rear end direction of the inner cylinder is in pressure contact with the outer circumference taper surface of the motor case. The fastening taper surface has a large diameter in the rear end direction and a small diameter at the movement source. Therefore, the fastening taper surface strongly frictionally engages the outer circumferential taper surface like a wedge, and does not cause slippage in the circumferential direction, ensuring a secure fastening fit between the inner cylinder of the handpiece and the motor case. To do. Further, since the inner cylinder always acts in the direction of tightening the motor case by the pressing spring, the connection between the handpiece and the motor case does not become loose and the reliable tightening is possible.

Also, to separate the motor case and handpiece,
The outer cylinder is pressed toward the handpiece against the restoring force of the pressing bar. By this pressing, the pressing force of the pressing taper surface on the pressing body is released, so that the pressing body can move in the outer peripheral direction of the inner cylinder. With this movement, the inner cylinder releases the fastening force to the motor case, and the handpiece and the motor case can be easily separated.

As described above, in the present invention, the fastening and unfastening of the handpiece and the motor case can be performed extremely easily by simply operating the outer cylinder on the handpiece side, and the quick conversion work of the handpiece can be performed. It will be possible.

Further, in this tightened state, the pressing body strongly presses the pressure receiving taper surface, so that the handpiece and the motor case can be securely engaged and fixed. Also, since the fastening taper surface and the outer peripheral taper surface are fixed by a strong frictional force like a wedge, the handpiece and the motor case do not rotate around during use, and with a strong fastening force close to a rigid body. It is possible to connect to.

Embodiment An embodiment of the present invention will be described below. (1) is a motor part, and a motor case (3) provided on the inner circumference of a casing (2) is detachably connected to a handpiece (4). There is.

The handpiece (4) has a tool (5) for cutting, polishing, etc. at its tip, which is detachably projected by a chuck (6). Further, on the handpiece (4) side, an inner cylinder (8) is provided inside the outer peripheral control cylinder (7) for controlling attachment / detachment of the chuck (6).

On the outer circumference of this inner cylinder (8), an outer cylinder (1
0) is pressed and urged by the pressing bar (11) whose one end is fixed to the inner cylinder (8). This pressing spring (11) is the inner cylinder (8).
One end is abutted against a spring seat (13) fixed by a shaft retaining ring (12) protruding to the outer periphery of the. The pressing bar (11) urges the inner cylinder (8) toward the motor section (1) by abutting the other end against the annular recess (14) of the outer cylinder (10).

The pressing taper surface (15) formed on the inner circumference of the outer cylinder (10) in the pressing direction is pressed into contact with the spherical pressing body (16).
Then, the pressing body (16) is connected to the engagement opening (1) of the inner cylinder (8).
It fits into 7) with a clearance and penetrates so that it can move in the penetration direction.

A pressure receiving taper surface (18) is formed on the outer circumference of the motor case (3) slidably inserted in the inner circumference of the inner cylinder (8) in a direction in which the pressing taper surface (15) and the extension direction intersect. The pressing body (16) can be brought into contact with the pressure receiving tapered surface (18).

Further, a fastening taper surface (20) having a larger diameter in the rear end direction is formed on the inner periphery of the inner cylinder (8) in the rear end direction. The fastening taper surface (20) is slidably pressed into contact with the outer peripheral taper surface (21) of the motor case (3), and the inner cylinder (8) is
The motor case (3) can be fastened with the.

Further, the inner circumference of the motor case (3) penetrates the main shaft (23) of the motor section (1) through the bearing (22), and the chuck case (24) is connected to the main shaft (23). is doing.

In connecting the handpiece (4) and the motor case (3) with the above-mentioned structure, first, the outer cylinder (10) is manually pressed against the restoring force of the pressing bar (11). It pushes and slides in the direction of the handpiece (4) to release the pushing force of the outer cylinder (10) against the pushing body (16). Then, the front end direction of the motor case (3) is inserted into the inner circumference of the inner cylinder (8) of the handpiece (4). By this insertion, the pressing body (16) is attached to the outer periphery of the motor case (3) as shown in FIG.
Push in the direction of the outer cylinder. When further inserted, the pressing body (16) comes into contact with the pressing tapered surface (15) of the outer cylinder (10). When the motor case (3) is further inserted into the inner cylinder (8), the pressing body (16) comes into contact with the pressure receiving taper surface (18) of the motor case (3) as shown in FIG.

In addition, the pressing of the outer cylinder (10) in the handpiece direction by the hand is released, and the restoring force of the pressing bar (11) causes the outer cylinder (1
0) is pressed and urged in the direction opposite to the handpiece (4).
Then, the pressing taper surface (15) formed on the inner periphery of the outer cylinder (10) in the pressing direction biases the spherical pressing body (16) toward the inner direction of the inner cylinder (8). By this pressing force, the pressing body (16) presses the pressure receiving tapered surface (18) of the motor case (3).

The pressure receiving tapered surface (18) is formed in a direction in which the pressing taper surface (15) and the extension direction intersect. Therefore, the pressing body (16) changes the pressing urging direction by the pressure receiving taper surface (18) and presses the pressure receiving taper surface (18) in the inner peripheral direction, and the pressure is applied through the engagement opening (17). A force for pressing the tube (8) toward the rear end is generated. Then, when the pressing biasing force by the pressing taper surface (15) acts, the pressing body (16) further presses the pressure receiving taper surface (18) in the inner peripheral direction as shown in FIG. 3 and press-fixes it with a strong force. .

Further, the tightening taper surface (20) of the inner cylinder (8) strongly tightens the outer circumference taper surface (21) of the motor case (3) like a wedge. Therefore, the fastening taper surface (20) and the outer circumferential taper surface (21) do not slip, and the inner cylinder (8) of the handpiece (4) and the motor case (3) are further tightened and fitted together. Make sure. Also, the inner cylinder (8)
Always acts in the direction in which the motor case (3) is fastened, so the connection between the handpiece (4) and the motor case (3) does not become loose, and secure fastening is possible. .

To separate the motor case (3) and the handpiece (4), the outer cylinder (10) is pressed in the direction of the handpiece (4) against the restoring force of the pressing bar (11). By this pressing, the pressing tapered surface (15) of the outer cylinder (10) releases the pressing on the pressing body (16). Then, when the motor case (3) is moved in the direction of pulling out from the inner cylinder (8), the pressing body (16) causes the pressure receiving taper surface (18) to move as shown in FIG.
The handpiece (4) and the motor surface (1) can be easily separated by overcoming and separating.

Further, although the pressing body (16) is formed in a spherical shape in the above-mentioned embodiment, it is not always necessary that the pressing taper surface (1
5) and the pressing body (16) in contact with the pressure receiving taper surface (18) may be formed in an arcuate surface. Even if the pressing body (16) is elliptical, it is formed in a semicircular columnar body. Is also good.

Effect of the Invention Since the present invention is configured as described above, a handpiece for a hand-held processing device used for dental treatment, dental technique, various metal workings, and other relatively precise cutting, polishing, etc. And the motor part is formed separately so that it can be attached and removed freely. Further, the fastening and unfastening of the handpiece and the motor case can be performed extremely simply by operating the outer cylinder on the handpiece side, and the quick replacement work of the handpiece becomes possible.

Further, in this tightened state, the pressing body strongly presses the pressure receiving tapered surface, so that the handpiece and the motor case can be reliably engaged and fixed. In addition, since the fastening taper surface and the outer peripheral taper surface are fixed with a strong frictional force like a wedge, the handpiece and the motor case do not rotate around during use, and a strong fastening force close to a rigid body. It is possible to connect with.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a sectional view, FIG. 2 is an enlarged sectional view of a connecting portion of a motor part and a handpiece, and FIG. FIG. 4 is an enlarged cross-sectional view showing a pressed state, and FIG. 4 is an enlarged cross-sectional view showing a state where the pressing tapered surface releases the pressing body. (3) …… Motor case (8) …… Inner cylinder (10) …… Outer cylinder (11) …… Pressing spring (15) …… Pressing taper surface (16) …… Pressing body (17) …… Engagement port (18) …… Pressure receiving taper surface (20) …… Tightening taper surface (21) …… Outer peripheral taper surface

Claims (2)

[Scope of utility model registration request] 1. An outer cylinder slidably mounted on the outer circumference of the inner cylinder,
Pressing and urging with a pressing spring whose one end is fixed to the inner cylinder, the pressing taper surface formed on the inner circumference of the outer cylinder in the pressing urging direction,
Pressing contact with the arcuate surface of the pressing body, penetrating this pressing body into the engaging opening of the inner cylinder so that it can move in the penetrating direction, and slidingly inserting it into the inner circumference of this inner cylinder. , The pressure receiving tapered surface is formed in the direction in which the extension direction intersects with the pressing tapered surface, and the arcuate surface of the pressing body is pressed against this pressure receiving tapered surface, and the inner diameter of the rear end of the inner cylinder is increased in the rear end direction. A device for attaching and detaching a handpiece, characterized in that a fastening taper surface is formed, and the fastening taper surface is slidably pressed against the outer circumferential taper surface of the motor case. 2. The handpiece attaching / detaching device according to claim 1, wherein the pressing body is formed in a spherical shape.