JPH0410817B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention transmits the rotational force of the drive shaft of the gripping sleeve portion to the gear in the cartridge housed in the tool head via the interlocking shaft. The present invention relates to a hand piece that transmits data to a tool, particularly the connection and separation of a grip sleeve portion and a tip sleeve portion, and the engagement and separation of an interlocking shaft and a gear in a cartridge during this connection.

<Prior Art> As a conventionally known dental handpiece, for example, the one shown in FIG. 6 is known.
This is made up of a distal end sleeve portion 2 having a tool head 1 and a grip sleeve portion 3 which are removably connected.
In this connected state, rotational force can be transmitted to the tool 4 in the tool head 1 from the drive shaft in the gripping sleeve via the interlocking shaft 5. Further, as shown in FIG. 7, the interlocking shaft 5 has gears 5a, 5b such as bevel gears at both ends, and is rotatably supported within the mounting sleeve 6. Then, this interlocking shaft 5 is fitted into the distal end sleeve portion 2 together with the mounting sleeve 6, and the mounting sleeve 6 is fixed within the distal end sleeve portion 2 by the stopper 7.
At this time, the gear 5a is connected to the cartridge (not shown).
It meshes with a gear 4a that rotates integrally with a tool 4 that is detachably attached to the tool. Further, 8 is a ring-shaped locking notch provided on the outer periphery of the right end of the mounting sleeve 6, and this locking notch 8 is attached to the inner periphery of the gripping sleeve portion 3 when connecting the tip sleeve portion 2 to the gripping sleeve portion 3. The connection is stabilized by fitting into a resilient locking ball (not shown).
Numerals 9 and 10 are positioning protrusions and notches formed on the tip sleeve portion 2 and the grip sleeve portion 3, respectively, and by engaging these with each other, the predetermined relative positions of the sleeves 2 and 3 are always secured. It's getting old.

On the other hand, since the above-mentioned conventional handpiece has the interlocking shaft 5 fixed by the tip sleeve 2 and the stopper 7, the dentist must use a screwdriver when attempting to disassemble the handpiece. JP-A-55-91343 has been proposed as a solution to this inconvenience.

<Problems to be Solved by the Invention> However, in such a conventional dental handpiece, when the cartridge to which the tool 4 is attached is to be replaced, the distal end sleeve portion 2 having the interlocking shaft 5 must be replaced. The tool head 1 must be replaced with a new one, and the cost of replacing the cartridge becomes extremely high.In addition, cleaning and maintenance of the cartridge must be done by a professional. Since gear 4a meshes with gear 5a,
There were problems such as it being difficult for doctors to replace the cartridges themselves.

Even if the above-mentioned Japanese Patent Application Laid-Open No. 55-91343 is designed to simplify assembly and disassembly without using a screwdriver, this structure releases the grip sleeve portion and the tip sleeve portion from the connection. Even in this state, the raised part on the outer periphery, the base part, and the O-ring of the interlocking shaft still remain in close contact with the tip sleeve. Not only does the gear and the interlocking shaft remain in a meshed state, making disassembly operations time-consuming, but the connection between the grip sleeve and the tip sleeve is also difficult due to the L-shaped slit of the socket in the grip sleeve and the tip sleeve. Depending on the pin, cumbersome operations such as pushing and turning operations are required. Moreover, if the interlocking shaft is held in the tip sleeve section only by friction, the rotation and vibration of the interlocking shaft will be transmitted to the outer circumference of the tip sleeve section, resulting in a new drawback such as the so-called spinning phenomenon. invite

This invention focuses on the above-mentioned problem, and when the grip sleeve section is pulled out from the tip sleeve section, the interlocking shaft loosely fitted in the tip sleeve section is also pulled out at the same time, thereby facilitating the operation. Thereafter, the present invention aims to provide a dental handpiece in which the cartridge can be easily taken out by disassembly to facilitate sterilization and maintenance, and the cartridge can be replaced as necessary.

<Means for solving the problems> This invention achieves the above object,
The gist is a gripping sleeve to which a drive shaft rotated by a motor is attached, a tip sleeve connected to the gripping sleeve, and a cartridge that is formed integrally with the tip sleeve and contains a gear that rotates the tool. In the handpiece, a mounting sleeve is inserted into the distal end sleeve part in a loosely fitted state, and the mounting sleeve supports the interlocking shaft that is interposed between the drive shaft and the gear and meshes with each other. It is fixed to the sleeve part side so that it can be engaged with and disengaged from the gear integrated with the interlocking shaft and the cartridge, and the grip sleeve part and the tip sleeve part can be connected and disengaged by pushing and pulling out. This dental handpiece is characterized by:

<Operation> Since the interlocking shaft in this invention is fixed to the grip sleeve side, when the grip sleeve portion is pulled out from the tip sleeve, it removably engages with the gear in the cartridge housed in the tool head. Therefore, when this cartridge is removed, the cartridge can be immediately released from the interlocking shaft, making it possible to replace only this cartridge. In addition, the grip sleeve part and the tip sleeve part can be connected and separated by simple operations such as pushing and pulling out, and even when connecting, the mounting sleeve can be loosely inserted into the tip sleeve, and the interlocking shaft To rotate without causing a spinning phenomenon.

<Embodiment of the Invention> FIG. 1 is a front view of a dental handpiece showing an embodiment of the present invention, in which a grip sleeve portion 3 and a distal end sleeve portion 2 are shown separated. In this embodiment, the interlocking shaft 5 supported by the mounting sleeve 6 is rotatably mounted on the grip sleeve portion 3 side so as not to come off. In addition, the tip sleeve part 2
A joint cylinder 12 is protruded from the side, and each sleeve 2,
3, the mounting sleeve 6 is connected to the joint tube 1.
2 and the grip sleeve 3
The joint tube 12 is inserted inside the tip of the tube. A ring-shaped locking notch 13 is provided on the outer periphery of the end of the joint cylinder 12.

FIGS. 2 and 3 are enlarged sectional views showing the structure of the grip sleeve portion 3 at a portion where the interlocking shaft 5 is attached. According to this, a ring-shaped joint cutout 14 for receiving the joint cylinder 12 is provided around the mounting sleeve 6 that supports the interlocking shaft 5, and the tip of the grip sleeve portion 3 that forms this joint notch 14 has approximately Through holes 15 are bored at three distances, and steel balls 16 are inserted into these through holes 15. In addition,
These steel balls 16 are provided in each through hole 15 provided with a taper whose diameter becomes narrower toward the bottom so that the steel balls 16 do not fall into the joint notch 14.
Reference numeral 17 denotes a leaf spring fitted onto the outer periphery of the tip of the grip sleeve portion 3, which is connected to each steel ball 16 in the through hole 15.
is pressed in the direction of the joining notch 14.

Further, the right end of the mounting sleeve 6 is fixed to the grip sleeve section 3, and one gear 5b of the interlocking shaft 5 rotating within the mounting sleeve 6 is always connected to a gear 18 driven by a motor within the grip sleeve section 3. They mesh together.

On the other hand, as shown in FIG. 4, the tool head 1 and the tip sleeve part 2 are connected to a cartridge 21 which allows the tool 4 to be attached and detached by means of a chuck and accommodates a gear 4a.
It consists of a head case 22 that accommodates the cartridge 21, and a head cap 23 that is screwed into the head case 22 so that it can be opened and closed so that the cartridge 21 can be easily replaced.

FIG. 5 is an enlarged sectional view showing the internal structure of the friction grip type tool head 1.
A cartridge case 21a of the cartridge 21 is fixed within a head case 22, and a vertical cylinder 32 is rotatably supported within the cartridge case 21a via a pair of upper and lower bearings 31. A chuck member 35 having a chuck piece 35a at the lower end is screwed into the inside of this vertical cylinder 32, and the shaft 4b of the tool 4 is engaged with this chuck member 35 to be detachably held. Further, reference numeral 36 denotes a square hole formed at the upper end of the chuck member 35, into which a square wrench is inserted and rotated, thereby making it possible to easily attach and detach the tool 4. A gear 4a is attached to the outer periphery of the vertical cylinder 32.
The gear 5a of the interlocking shaft 5 inserted through the notch hole 33 of the cartridge case 21a is removably engaged with the gear 5a. Reference numeral 34 is a through hole provided in the head cap 23, which allows the wrench to be inserted into the square hole 36.

When using the dental handpiece having such a structure, first, the mounting sleeve 6 that supports the interlocking shaft 5 fixed to the grip sleeve portion 3 shown in FIG. 1 is loosely fitted into the distal end sleeve. Connect part 2. The procedure for this connection is simply to push the joint tube 12 into the mounting sleeve 6 on the grip sleeve portion 3 side,
It is only necessary to apply force to each other in the direction of compression. That is, the compression operation causes the joining cylinder 12 to enter into the joining notch 14, and the compression operation is performed until the steel ball 16, which is pressed by the leaf spring 17, falls into the locking notch 13 of the joining cylinder 12. At this time,
The gear 5a of the interlocking shaft 5 enters the joint cylinder 12 and meshes with the gear 4a inside the head case 22 in an optimal state. For this reason, the grip sleeve portion 3 is
The rotation transmitted to the interlocking shaft 5 via the drive shaft (not shown) and the gear 18 is transmitted to the tool 4 via the gear 4a, allowing the desired dental treatment to be performed.

On the other hand, when the cartridge 21 is to be sterilized or replaced, the tip sleeve 2 is separated from the grip sleeve portion 3. That is, the joining tube 12 is forcibly pulled out from the outer periphery of the mounting sleeve 6. Next, the head cap 23 is removed by unscrewing it from the head case 22, and the cartridge 2 is removed with the tool 4 removed from the chuck part 35 or with it attached.
1 from the head case 22. In this way, the cartridge 21 itself can be easily sterilized, maintained, and inspected, and the cartridge itself can be replaced with a new one of the same type or with a different type. In this way, when maintenance or replacement is completed, these are housed in the head case 22,
Close the head cap 23 and finish the work.
In addition, during dental treatment, various tools such as cutting tools are selected and used by attaching them to the chuck.

In the above embodiment, a dental handpiece with a friction grip type tool head structure was explained, but dental handpieces with a contrabar type or prophy type tool head structure are also applicable.
A structure similar to the above can be adopted.

In addition, in the above embodiment, the mounting sleeve 6 is fixed to the grip sleeve portion 3 by press-fitting or other methods.
This can be done using screws, adhesives, or other means.

Furthermore, the tip sleeve part 2 and the grip sleeve part 3
Although the steel ball 16, the leaf spring 17, and the locking lock 13 are used for connection with the steel ball 16, any other well-known connection structure can be adopted, and the same result as in the above embodiment can be achieved. Effects can be obtained.

<Effects of the Invention> According to this invention, one end of the mounting sleeve that supports the interlocking shaft is fixed to the grip sleeve side, so that
When the grip sleeve part is separated from the tip sleeve part together with the mounting sleeve, the gear attached to the cartridge in the head case of the tool head is separated and released from the gear at the end of the interlocking shaft, and therefore, the cartridge and the cartridge are removed from the head case. It can be taken out, and cleaning, sterilization, and other maintenance work can be carried out efficiently and reliably. Furthermore, since only the cartridge needs to be replaced, the cost of parts replacement can be significantly reduced compared to the conventional method.

In addition, the grip sleeve portion and the tip sleeve portion can be easily connected and separated by a simple operation of pushing in and pulling them out, and in addition, the mounting sleeve is loosely fitted within the tip sleeve when connected.
Since it is fixed inside the grip sleeve, there is no risk of it moving around the collar.

[Brief explanation of drawings]

FIG. 1 is a front view of the main parts of the dental handpiece according to the present invention separated, FIG. 2 is an enlarged sectional view of the grip sleeve, and FIG. 3 is a sectional view taken along line A-A in FIG. 2. Figure 4 is an exploded front view of the tool head, Figure 5 is an enlarged sectional view of the tool head, Figure 6 is a front view of a conventional dental handpiece separated, and Figure 7 is the interlocking shaft. FIG. 3 is a cross-sectional view showing the relationship between the mounting sleeve and the mounting sleeve. 1...Tool head, 2...Tip sleeve part, 3
... Grip sleeve portion, 4 ... Tool, 5 ... Interlocking shaft, 21 ... Cartridge, 22 ... Head case, 23 ... Head cap.

Claims (1)

[Scope of Claims] 1. A gripping sleeve portion to which a drive shaft rotated by a motor is attached, a tip sleeve portion connected to the gripping sleeve portion, and a gear integrally formed with the tip sleeve portion for rotating the tool. In the handpiece, a mounting sleeve supporting a tool head that accommodates a cartridge and a linkage shaft that is interposed between the drive shaft and the gear and meshes with each other is inserted into the distal end sleeve part in a loosely fitted state, the mounting sleeve One end is fixed to the gripping sleeve side so as to be able to engage and disengage from a gear integrated with the interlocking shaft and the cartridge, and the gripping sleeve portion and the tip sleeve portion are connected by pushing and pulling. - A dental handpiece that is characterized by being able to be detached.