JPH0725927Y2 - Screw hole drilling tool for implant materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a screw hole drilling tool for implant material, which transmits the rotational force of a motor to a tip tool via a transmission.

[Conventional technology]

Conventionally, when implanting a denture in a jawbone or the like, the entire maintenance / stabilizing device is embedded under the soft tissue of the missing tooth portion, and the above denture is fitted on the device, thereby maintaining the stability of the denture. I am trying.

By the way, such a maintenance and stabilization device is called an implant material, which is formed by a special material and can be screwed into, for example, a screw hole formed in the soft tissue of the above-mentioned missing tooth part by the tip tool of the dental treatment device. Shape and structure. Therefore, in order to surely and securely screw the implant material, it is necessary to highly accurately form a screw hole which is a hole for attaching the implant material.

[Problems to be solved by the device]

However, in such a conventional dental treatment apparatus, mainly the rotation of a low torque motor is reduced by a transmission to reduce the rotation speed to a low speed, and the high torque increased as the rotation speed is reduced is transmitted to the tip tool to cause the screw hole to move. Is being drilled, and the torque of the tip tool for this drilling is always constant. Therefore, due to fluctuations in power supply voltage and deterioration of motor characteristics,
By changing the torque of the tip tool, a difference occurs in the drilling depth of the screw hole for the soft tissue of the missing tooth portion, or by the rotation of the tip tool in the screw hole of the same depth,
If the threads in the screw hole are spilled, the implant material cannot be attached firmly and accurately, and the denture cannot be meshed with other teeth with sufficiently high accuracy. was there.

The present invention has been made to solve the above problems, and when the counter torque from the tip tool exceeds a set value, the rotation of the tip tool is decelerated or stopped, and the screw An object of the present invention is to provide a screw hole drilling tool for implant material, which can surely prevent drilling of an excessively deep hole and spillage of a screw thread.

[Means for Solving the Problems]

The screw hole drilling tool for implant materials according to this invention is
A drive-side clutch plate and a tool-side clutch plate each having an uneven surface that fits in the axial direction are provided between the motor and the transmission, and each uneven surface is inclined with respect to a flat reference surface having no unevenness. The inclined surface and a vertical surface perpendicular to the reference surface are alternately provided in the circumferential direction, and further, among the uneven surfaces of the drive-side clutch plate and the tool-side clutch plate, one is to the other, When the counter torque from the tip tool exceeds a set value by elastically biasing by a spring set to the counter torque from the tip tool, the inclined surfaces slide against each other against the spring. , The drive side clutch plate is allowed to idle, and in the return path of the tip tool in the screw hole after the screw hole is drilled to a desired depth, the motor is rotated in the reverse direction to rotate. It is obtained so as to transmit to the tip tool through the respective vertical plane.

The counter torque from the tip tool set in the spring means that when a screw hole for an implant material is drilled, the screw hole is not forcibly opened or the screw thread is not broken, and the screw hole is drilled. Optimal torque for

[Operation] The drive-side clutch plate and the tool-side clutch plate, which are fitted to each other on the concave-convex surface in this invention, resist the springs when the counter torque exceeding the set value acts on the tool-side clutch plate. By letting the inclined surfaces, which are part of the surface, slide on each other while sliding on each other,
By disengaging the above-mentioned fitting, the drive-side clutch can be independently idle-rotated with respect to the tool-side clutch plate, and the rotational torque of the tip tool connected to the tool-side clutch plate can be reduced. It is possible to prevent the excessive size of the screw hole formed in the soft tissue of the portion and the spillage of the screw thread. In addition, in the return path of the tip tool in the screw hole after drilling the screw hole to the desired depth by the tip tool, rotation to the tip tool is prevented so that the drive side clutch does not accidentally idle. The force is transmitted in the reverse direction of the motor through the vertical surfaces of the uneven surfaces.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing the details of the present invention, and FIG. 2 is an exploded perspective view of the same. In the figure, 1 and 2 are a pair of left and right brackets that form the case of the transmission unit A, and 3 is a cylindrical sun gear that connects these brackets 1 and 2 and that forms the case. It has teeth on the inside. Reference numerals 4 and 5 are screws for connecting the sun gear 3 to the brackets 1 and 2 at the ends. Also, each bracket 1,2
The center holes 6 and 7 are provided in these, and these are ring-shaped. 8 and 9 are two sets of discs provided in the space surrounded by the brackets 1 and 2 and the sun gear 3, and these discs are
At the end of 8, 9 divided into three equal parts, each 3 support shafts 10,
11 is installed. 12,13 are each of these spindles 10,11
On the other hand, the planetary gears 12, 13 are meshed with the sun gear 3 with a small planetary gear rotatably fitted through the washers 17, 18. Reference numeral 14 is a small-diameter transmission gear fixed to the center of the disc 9 and meshes with the planet gear 12. A transmission shaft 15 is fixed to the center of the disk 8 and guides rotation to the outside. One end of the transmission shaft 15 projects outside the bracket 1 and is connected to the transmission gear 16. Reference numeral 19 is a washer for lubrication interposed between the bracket 1 and the disk 8, and 20 is a washer similar to the above interposed between the bracket 2 and the planetary gear 13.

On the other hand, B is a tool drive unit having a rotation transmission mechanism. In this tool drive unit B, 21 is a planetary gear 13
Drive gear that meshes with the drive gear, 22 is a rotary shaft with the drive gear 21 attached to the tip (left end), 23 is a bearing that supports the outer circumference of the rotary shaft 22 inside the cover member 25, and 24 is the rotation of the bearing 23. A washer that holds the shaft 22 so that it does not come off, 26 is the rotating shaft 22
A long hole is formed at the right end of the cylinder wall, and a pair of long groove holes 27 are provided at opposing portions on the cylindrical wall forming the long hole 26. Further, 28 is a driven shaft slidably accommodated in the elongated hole 26 via a coil spring 29, and both ends of a pin rod 30 attached so as to penetrate the driven shaft 28 are axially inserted into the elongated groove 27. It is slidably guided. Reference numeral 31 denotes a tool-side clutch plate integrally provided on the end (right end) of the driven shaft 28, 32 denotes a drive-side clutch plate which is detachably joined to the tool-side clutch plate 31 by means of an uneven surface portion, and 33 denotes this drive side. The drive shaft integrally includes the clutch plate 32 at the left end, and the drive shaft is rotatably driven by linking with the rotary shaft of a motor (not shown). In addition, the shaft portion 34a of 34 is the pin rod 3
It is a displacement shaft fixed to the driven shaft 28 together with 0, and this displacement shaft 3
The driven shaft 28 is provided between the flange portion 34b formed at the right end of the drive shaft 4 and the bottom portion in the elongated hole 33a formed in the drive shaft 33.
A spring 35, which is urged to the drive shaft 33 side by the set pressure via 4 (i.e., to the right in the figure) and set to a counter torque from a tip tool suitable for drilling a screw hole for implant material, is interposed. .

Further, the driven shaft 28 and the tool-side clutch plate 31 are shaped as shown in FIGS. 3 and 4, and are inclined with respect to the flat reference surface 31E when the tool-side clutch plate 31 has no unevenness. Four sets of inclined surfaces 31A and vertical surfaces 31D that are perpendicular to the reference surface are alternately provided in the circumferential direction.
A concave surface 31B coinciding with E and a convex surface 31C protruding from the reference surface are defined. Further, the drive shaft 33 and the drive side clutch plate
32 has a shape as shown in FIGS. 5 and 6, and the driving side clutch plate 32 has the inclined surface 31A, the concave surface 31B, and the vertical surface.
Four sets of inclined surfaces 32A, convex surfaces 32C, vertical surfaces 31D and concave surfaces 32B, which are fitted to 31D and convex surfaces 31C, are continuously provided in the circumferential direction. The driving side clutch plate 32 and the tool side clutch plate 31 are fitted in the axial direction as shown in FIG. 7, and such fitting is performed under a set pressure by the elastic force of the spring 35. The transmission unit A as described above is provided with an output shaft for attaching a tip tool (not shown) for forming a screw hole via the transmission gear 16, and the tool drive unit B is provided with a drive shaft 33. A motor (not shown) is connected, and the transmission unit A and the tool drive unit B are housed in one outer case.

Next, the operation will be described.

First, by driving a motor (not shown), the drive shaft 33 associated therewith rotates. Due to the rotation of the drive shaft 33, the inclined surface of the drive-side clutch plate 32 integrated with the drive shaft 33 is formed.
32A, vertical surface 32D, concave surface 32B, convex surface 32C, inclined surface 3
The tool side clutch plate 31 having 1A, the vertical surface 31D, the convex surface 31C, and the concave surface 31B also rotates in the same direction by the transmission of the rotation through the substantially inclined surfaces 32A, 31A (arrow C in FIG. 7). Therefore, the rotary shaft 22 linked to the driven shaft 28 having the tool side clutch plate 31 via the pin rod 30 rotates while being supported by the bearing 23, and this rotation is transmitted to the drive gear 21.
Therefore, the planetary gear 13 of the transmission unit A meshing with the drive gear 21 rotates, and the planetary gear 13 makes a circumferential movement along the outer sun gear 3. Therefore, due to this circumferential movement, the disk 9 to which the planetary gear 13 is attached is rotated at a reduced speed by the drive gear 21 and the sun gear 3. Further, the rotation of the disk 9 is transmitted to another planetary gear 12 via the transmission gear 14, whereby the other disk 8 is further decelerated by a predetermined gear ratio, and the disk 9 is attached. It is conducted to the conducting shaft 15 that is open. Further, the rotation of the transmission shaft 15 is transmitted to a mechanical driving element as an output shaft via a transmission gear 16 and is transmitted to a tip tool forming a screw hole for embedding an imbrunt material for mounting a denture.
In such a transmission unit A, the rotation of the motor 34 can be reduced to 1/16 and transmitted to the tip tool 37. Further, a transmission unit in which a plurality of planetary gears 12 and 13 as described above are further added is referred to as the transmission unit A described above.
By using it instead of, it is possible to give rotation with a larger reduction ratio to the tip tool.

On the other hand, during the work of drilling the screw hole with the tip tool, if a counter torque of a set value or more acts on the tip tool due to, for example, the drive torque of the motor increasing for some reason, this The counter torque passes through the drive gear 21 and the rotary shaft 22 and the tool side clutch plate.
It is also transmitted to 31. In this case, the spring 35 causes the tool side clutch plate 31 to move through the displacement shaft 34 and the driven shaft 28.
Is pressed against the drive side clutch plate 32 at a predetermined set pressure, and when the counter torque exceeds the set value and becomes excessive, the drive shaft 33 is moved to the right while compressing the spring 35. At this time, the pin rod 30 is guided in the axial direction along the slot 27, and the coil spring 29 is also compressed. Therefore, the inclined surfaces 31A and 32A of the clutch plates 31 and 32 slide on each other and ride on each other, and the convex portions 31C and 32 are brought into sliding contact with each other, and then the convex portions 31C and 32C are fitted into the concave portions 32B and 31B again. Repeat the click rotation operation. That is, the drive-side clutch plate 32 idles with respect to the tool-side clutch plate 31 that receives the counter torque and decelerates. As a result, the tool side clutch plate 31 is decelerated or stopped, and the tip tool driven by this is prevented from forcibly prying open the screw hole for mounting the implant material. Therefore, it is possible to prevent the threaded hole from being cut more deeply than necessary or being destroyed by repeatedly drilling the screw thread.

Further, after the screw hole is drilled to a predetermined depth by the tip tool, when the tip tool is taken out from the screw hole, the motor is reversely rotated to give the tip tool a rotation opposite to that at the time of drilling. This rotation is transmitted from the motor (arrow D in FIG. 7) to the tip tool via the vertical surfaces 32D, 31D of the drive side clutch plate 32 and the tool side clutch plate 31. Therefore,
On the return path in the screw hole of the tip tool, the drive side clutch plate 32 is mistakenly changed from the inclined surface 32A to the inclined surface 3 of the tool side clutch plate 31.
The tip tool can be reliably taken out from the screw hole without riding on 1A and spinning.

[Effect of device]

As described above, according to the present invention, the drive-side clutch plate and the tool-side clutch plate having the concave and convex surfaces axially fitted to each other are provided between the motor and the transmission, and the drive-side clutch plate and the tool clutch plate are provided. The uneven surface of the side clutch plate is formed by alternately providing in the circumferential direction an inclined surface that is inclined with respect to the reference surface when there is no unevenness and a vertical surface that is perpendicular to the reference surface, One of the concavo-convex surfaces of the side clutch plate and the tool side clutch plate is biased against the other by a spring set to the counter torque from the tip tool so that the counter torque from the tip tool exceeds the set value. At this time, the inclined surfaces are slid against each other against the spring so that the drive-side clutch plate idles, so that the screw hole drilled by the tip tool has an excessive depth. Ri, the accident that destroyed the threads of the screw holes can be prevented. Therefore, the effect of being able to attach the implant material to the soft tissue of the missing tooth portion with high accuracy and firmly and optimizing the meshing of the denture with other teeth can be obtained. Further, in the return path of the tip tool in the screw hole after drilling the screw hole to a desired depth, the torque of the motor is transmitted to the tip tool through each of the vertical planes. When the tip tool is taken out from the inside, the drive side clutch plate does not accidentally run over the inclined surface and run idle.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a screw hole drilling tool for implant material according to the present invention, FIG. 2 is an exploded perspective view of a tool driving unit and a transmission unit in FIG. 1, and FIG. The side view of the tool side clutch plate in FIG. 1, 4th
The figure is also a front view, FIG. 5 is a side view of the drive side clutch plate in FIG. 1, FIG. 6 is a front view of the same, and FIG. 7 is a side view showing a fitted state of the tool side clutch plate and the drive side clutch plate. It is a figure. A ... Transmission unit, 31 ... Tool side clutch plate, 32 ...
… Drive side clutch plate, 31A, 32A …… Inclined surface, 31B, 31C, 32
B, 32C: uneven surface, 35: spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 61-24873 (JP, A) JP 62-120847 (JP, A) JP 411-127 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A drive-side clutch plate and a tool-side clutch plate, which are provided between a motor and a transmission unit, and have concave and convex surfaces axially fitted to each other, and the drive-side clutch plate and the tool-side clutch. A spring for biasing one of the uneven surfaces of the plate against the other is provided, and each uneven surface is inclined with respect to a flat reference surface having no unevenness and is perpendicular to the reference surface. A screw hole drilling tool for implant material for transmitting the rotational force of the motor to the tip tool via the transmission unit by alternately forming and forming vertical surfaces in the circumferential direction, When the counter torque from the tool exceeds a certain value, the elastic bias of the spring for slipping the inclined surfaces against each other so that the drive side clutch idles, The vertical torque is matched with the set value of the counter torque from the tip tool suitable for drilling, and the vertical surface changes the rotational force of the motor on the return path of the tip tool in which the screw hole is drilled to a desired depth. A screw hole drilling tool for implant materials, which is transmitted to a tip tool.