JPH0551316U - Handpiece device - Google Patents

Abstract

(57) [Abstract] [Purpose] Along with facilitating accurate and reliable attachment / detachment of the handpiece housing and the motor case, it is possible to reliably prevent loosening therebetween during cutting work. A handpiece device that can be used. [Structure] A ring groove 14 cut out in a circumferential direction on an outer peripheral surface of a tubular end portion 15 of a handpiece housing 1, a sleeve 17 provided in a motor case 4 for receiving the tubular end portion 15, and a sleeve 17. An operation ring 19 provided on the outer periphery so as to be rotationally biased by a spring 20, a ball 22 provided so as to be capable of projecting from the inner surface of the sleeve 17,
A cam groove 23, which is formed on the inner peripheral surface of the operation ring 19 and presses the ball 22 and whose depth changes in the circumferential direction, is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a handpiece device in which a handpiece housing rotatably accommodating a handpiece shaft is detachably attached to a motor case having a drive shaft and a motor connected to the handpiece shaft.

[0002]

[Prior Art]

 FIG. 5 is a front view showing a part of a conventional handpiece device in a cutaway manner. In the figure, reference numeral 1 is a handpiece housing that rotatably accommodates a handpiece shaft having a clutch attached to its inner end. The threaded portion 3 is provided at one end of the threaded portion 3. Reference numeral 4 denotes a motor case to which the handpiece housing 1 is detachably mounted, and a screw portion 5 screwed into the screw portion 3 and a convex tip shaft 6a are coupled to the clutch at the time of mounting. A drive shaft 6 and a motor 7 having the drive shaft 6 and rotationally driving the drive shaft 6 are respectively provided.

In such a conventional handpiece device, for example, a handpiece housing 1 having a cutting tool 2 of a predetermined shape at its tip is screwed into the screw parts 3 and 5 to be integrated with the motor case 4. It is possible to connect them, whereby the cutting tool 2 of the handpiece or the like is exchanged. At this time, the not-shown clutch is coupled to the tip shaft 6a of the drive shaft 6 by the above-mentioned screwing, and the rotation of the motor 7 is transmitted to the handpiece shaft.

[0004]

[Problems to be solved by the device]

 However, in such a conventional handpiece device, since the coupling between the handpiece housing 1 and the motor case 4 is considered by the screw engagement of the screw portions 3 and 5, for example, vibration during cutting work is performed. Also, due to vibration of the motor 7 itself, looseness of the threaded portion gradually occurs, and the hold of the tip shaft 6a by the clutch is released, so that the rotational force is not transmitted to the cutting tool of the handpiece. there were.

Further, when the handpiece housing 1 is replaced, if the handpiece housing 1 is opposed to the motor case 4 and the screws 3 and 5 are screwed together in a positional relationship in which the clutch does not completely hold the drive shaft. Due to such screwing, the handpiece shaft and the drive shaft 6 press against each other with a strong force, and the bearings holding these shafts are damaged.

The present invention has been made in view of the above-mentioned conventional problems, and makes it possible to easily attach / detach the handpiece housing and the motor case, and to accurately mount the clutch on the drive shaft. Moreover, it is an object of the present invention to provide a handpiece device which can surely avoid unnecessary interference between the handpiece shaft and the drive shaft by completely fitting them together.

Another object of the present invention is to provide a handpiece device capable of reliably preventing loosening between the handpiece housing and the motor case during cutting work or the like.

[0008]

[Means for Solving the Problems]

 A handpiece device according to the present invention is provided with a ring groove cut out in a circumferential direction of an outer peripheral surface of a mounting portion for mounting the handpiece housing on a motor case and a motor case, and is provided in the motor case. A sleeve that receives the mounting portion and an operating ring that is provided on the outer circumference of the sleeve so as to be rotationally biased by a spring are provided, and a ball is attached to the sleeve so that the sleeve can project to the inner surface of the sleeve. By providing a cam groove on the inner peripheral surface of the operation ring, the depth of the cam groove for pressing the ball in the inner diameter direction of the sleeve is changed in the circumferential direction.

Further, in the handpiece device of the invention of the present invention, the handpiece housing has a rotation stop groove axially cut out at the tip of the mounting portion, and the sleeve has the rotation stopper groove. It is also possible to provide an anti-rotation pin projecting in the inner diameter direction of the and engaging with the anti-rotation groove.

[0010]

[Action]

 In the handpiece housing according to the present invention, when the mounting portion of the handpiece housing is inserted into the sleeve of the motor case, the ball provided on the sleeve so as to project from the inner surface of the sleeve is urged by the spring to pass through the ring groove. The sleeve is pressed in the inner diameter of the sleeve and fits into the ring groove on the outer circumference of the handpiece housing that is inserted into the sleeve, thereby connecting the handpiece housing to the motor case so that it will not come off easily.

If a rotation stopping groove is provided at the tip of the mounting portion of the handpiece housing and a rotation stopping pin is provided at the sleeve, these are engaged when the handpiece housing is mounted, so that the load during cutting work is reduced. By this, it is possible to further prevent the handpiece housing from being displaced in the circumferential direction with respect to the motor case and loosening between them.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a ball bearing that rotatably supports the handpiece shaft 12 in the handpiece housing 1, 13 is a clutch attached to the inner end of the handpiece shaft 12, and 14 is the handpiece housing 1. A V-shaped ring groove, which is formed in the circumferential direction on the outer circumference of the tubular end portion 15 at the end, as shown in FIG. 2, 16 is a tip end portion of the tubular end portion 15 of the handpiece housing 1. The rotation stop groove is formed by cutting out in the axial direction as shown in FIG.

Reference numeral 17 denotes a ring-shaped projecting member provided on the outer end of the motor case 4, and the sleeve 17 receives the tubular end 15 so as to be mounted on the inner peripheral surface thereof. A rotation stop pin, 19 projectingly provided in the rotation stop groove 16 and capable of fitting in the rotation stop groove 16 is rotationally biased by a spring 20 such as a torsion coil spring or a coil compression spring provided on the outer circumference of the sleeve 17. As described above, the tubular operation ring is attached to the outer periphery of the sleeve 17. Reference numeral 30 is a fixing ring for rotatably fixing the operation ring 19 so that the operation ring 19 does not fall off the sleeve 17. As shown in FIG. 4, one end of each spring 20 is fixed to the operating ring 19 and the sleeve 17, respectively. The operation ring 19 is configured to be rotatable on the sleeve 17.

Further, 21 is a ball hole provided so as to penetrate through the wall thickness of the sleeve 17, as shown in detail in FIG. 3, and 22 is inserted into the ball hole 21 and is provided with a sleeve. Balls 23 projectably provided on the inner surface of 17 are a plurality of cam grooves formed on the inner peripheral surface of the operation ring 19 and supporting the balls 22 and having a depth changing in the inner peripheral direction.

Next, the operation will be described. First, for example, when a cutting operation is to be performed with a handpiece device having a cutting tool 2, a handpiece housing 1 and a motor case 4 are prepared, and their respective end faces are opposed to each other as shown in FIG. . Next, the operation ring 19 is rotated against the bias of the spring 20 to release the pressing of the ball 22 by the cam groove 23, and the rotation formed on the tubular end portion 15 of the handpiece housing 1 is performed. The tubular end portion 15 is axially inserted into the sleeve 17 so that the stopper groove 16 engages with the rotation stopper pin 18 provided on the sleeve 17.

Since this insertion is performed manually by a person without screwing the screws, the clutch 13 at the end of the handpiece shaft 12 is attached to the front end shaft 6 a of the drive shaft 6 driven by the motor 7. It is possible to easily detect whether or not it is reliably held. Therefore, when the operation ring 19 is opened in the stroke region where the tip shaft 6a is securely held by the clutch 13, the ball 22 is moved through the cam groove 23 of the operation ring 19 by the urging force of the spring 20 and the inner diameter of the sleeve 17. It is pressed and biased in the direction, protrudes from the inner surface of the sleeve 17, and fits into the ring groove 14 of the tubular end portion 15.

Therefore, the cylindrical end portion 15 and the sleeve, that is, the handpiece housing 1 and the motor case 4 are connected to each other via the ball 22 so as not to easily come off, and the rotation of the motor 7 is prevented. It is transmitted to the piece shaft 12 and the cutting tool 2. Further, in this state, even if vibration or shock is applied to the handpiece housing 1 or the motor case 4, the balls 22 hold the cylindrical end portion 15 by the bias of the spring, so that they do not loosen each other. . Further, since the rotation stop groove 16 formed in the tubular end portion 15 of the handpiece housing 1 is engaged with the rotation stop pin 18 protruding from the sleeve 17, the rotation stop groove 16 is prevented from being affected by the load during the cutting operation. It further prevents the handpiece housing 1 from shifting in the circumferential direction with respect to the motor case 4 and causing looseness therebetween.

On the other hand, when the cutting tool 2 is to be replaced, when the handpiece housing 1 is to be removed from the motor case 4, the operation ring 19 has a deeper cam groove 23 than the ball 22. In such a direction, the rotary operation is performed against the bias of the spring 20. This allows the ball 22 to move freely in the cam groove 23, and by pulling out the handpiece housing 1 in the direction of separating it from the motor case 4, the ball 22 is easily moved into the cam groove 23. By retreating, the above-mentioned removal operation is performed lightly, and finally the handpiece 1 is separated from the motor case 4 quickly and easily.

[0020]

[Effect of the device]

 As described above, according to the present invention, in the handpiece device including the handpiece housing and the motor case to which the handpiece housing is detachably mounted, the outer peripheral surface of the mounting portion of the handpiece housing has a circular shape. There is a ring groove cut out in the direction, the sleeve that receives the mounting part of the handpiece housing on the motor case, the operation ring that is urged to rotate by the spring provided on the outer periphery of the sleeve, and the inner surface of the sleeve. Since the ball provided so as to be able to project and the cam groove that is formed on the inner peripheral surface of the operation ring and presses the ball and whose depth changes in the circumferential direction, the spring is provided via the cam groove of the operation ring. The ball held by is fitted into the ring groove on the outer periphery of the handpiece housing inserted into the sleeve, and the handpiece housing is So that the ball holds the handpiece housing by the spring force even if it receives vibrations or shocks, so looseness occurs with the motor case. The effect of being able to prevent is obtained.

In addition, the handpiece housing is provided with a rotation stop groove cut out in the axial direction at the tip of the mounting portion thereof, and the motor case is provided with a rotation stop pin fitted in the rotation stop groove. By inserting the stop groove into the rotation stop pin, it is possible to further prevent the handpiece housing from being displaced in the circumferential direction with respect to the motor case due to the load during the cutting work so that the handpiece housing is loosened therebetween.

[Brief description of drawings]

FIG. 1 is a sectional view showing a partially broken handpiece device according to an embodiment of the present invention.

FIG. 2 is a front view showing the handpiece device in FIG. 1 partially broken away.

3 is a vertical cross-sectional view showing the vicinity of the ball in FIG.

FIG. 4 is a longitudinal sectional view showing the vicinity of a compression spring of another embodiment in FIG.

FIG. 5 is a front view showing a conventional handpiece device partially broken away.

[Explanation of symbols]

 1 Handpiece Housing 2 Cutting Tool 4 Motor Case 6 Drive Shaft 7 Motor 12 Handpiece Shaft 13 Clutch 14 Ring Groove 16 Rotation Stop Groove 17 Sleeve 18 Rotation Stop Pin 19 Operating Ring 20 Spring 22 Ball 23 Cam Groove

Claims (2)

[Scope of utility model registration request] 1. A handpiece housing rotatably accommodating a handpiece shaft having a clutch attached to its inner end, the handpiece housing being detachably attached, and a drive shaft is coupled to the clutch at the time of attachment. In a handpiece device including a motor case accommodating a motor, a ring groove cut out in a circumferential direction on an outer peripheral surface of a mounting portion of the handpiece housing, and the handpiece housing provided in the motor case. A sleeve for receiving the mounting portion of the sleeve, an operating ring provided on the outer periphery of the sleeve so as to be rotationally biased by a spring, and a ball attached to the sleeve and projectable on the inner surface of the sleeve. A cam groove formed on the inner peripheral surface of the operation ring for pressing the ball, the depth of which changes in the circumferential direction; A handpiece device characterized by being provided with. 2. The handpiece housing has a rotation-stop groove axially cut out at the tip of the mounting portion, and the sleeve projects in the inner diameter direction of the sleeve and engages with the rotation-stop groove. The handpiece device of claim 1, comprising a mating detent pin.