JPH04197254A - Hand piece - Google Patents

Abstract

PURPOSE:To reduce the cost of production by integrally molding at least a revolving shaft and impeller of plastics or ceramics, etc., and to attain a high-frequency sterilization method using microwaves by forming the respective other parts of nonmetallic materials as well. CONSTITUTION:A head casing 18 in a head part 13 of the hand piece is bisected and the respective parts of the head part 13 are all constituted of the plastics or the combination of inorg. materials, such as ceramics. Then, not only the revolving shaft 14, the impeller 15 and the stopper part 17a of a chuck 17 are integrally molded, but also respective casing parts 18a, 18b and annular projecting parts 18c, 18c for sealing are integrally molded. The production of the respective parts is facilitated in this way and the number of the parts is reduced, by which a sizable cost reduction is resulted. Further, the use of the high-frequency sterilization method using the microwaves is possible as all the parts are made of the nonmetallic materials. The sterilization is thus executed in an extremely short period of time.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a handpiece used in dental treatment and the like.

[Conventional technology]

Hitherto, handpieces with various structures have been proposed, and FIG. 4 shows one example, in which a head part 2 is detachably detachable from a grip part 1. The internal structure of the head 3 is as shown in FIG. 5. For example, a hollow rotating shaft 4 is installed at the center, an impeller 5 is attached to the outer periphery of the rotating shaft 4, and an impeller 5 is attached to the outer periphery of the rotating shaft 4. has a built-in chuck 7 for holding the tool 6, and the whole is housed in a head casing 8, and bearings (hair ring mechanism) are installed at two locations (upper and lower) between the casing 8 and the outer periphery of the rotating shaft 4. 9.9 is installed, and by injecting compressed air or the like to the impeller 5, the rotating shaft 4 is rotated at high speed, and the tool 6 is rotated.

[Problem to be solved by the invention]

However, in the conventional head 3 described above, since the constituent members of each part are generally made of metal, there are the following problems that should be improved. (1) First, in the case of metal materials, integral molding by molding or the like is not suitable, and generally each item must be manufactured by machining. For this reason, not only the cost of each component increases, but also the number of components is large. Therefore, an increase in the manufacturing cost as a whole is unavoidable, making it difficult to reduce the cost. (2) What has recently become an even more serious problem is the problem of infections transmitted through handpieces. In other words, in the case of dental treatment, the handpiece is inserted into the patient's mouth, so due to recent infectious disease problems (AIDS, hepatitis A, etc.), when using it on another patient the next time, Must be sterilized. For this sterilization, for example, an autoclave method using high-temperature, high-pressure steam, a chemical crepe method using chemicals such as alcohol, or an ultraviolet irradiation method have been proposed. , drying, and other steps are required, which takes a long time (about 40 minutes to 1 hour), and also requires a dedicated liquid. On the other hand, although the ultraviolet irradiation method has the advantage that it takes only a short time (about several tens of seconds), it has the disadvantage that the sterilization of parts and interiors where the light does not reach is likely to be incomplete. The present invention has been made in view of such conventional circumstances.

[Means to solve the problem]

In other words, in order to solve the above-mentioned conventional problems, the present invention aims at reducing manufacturing costs by integrally molding at least the rotating shaft and the impeller from an inorganic material such as plastic or ceramic. First, the rotating shaft and impeller are integrally molded from inorganic materials such as plastic or ceramic, and other parts are also molded from inorganic materials such as plastic or ceramic, making them non-metallic and allowing for extremely short sterilization. This is a high-frequency sterilization method using microwaves. To describe the present invention more specifically, one of them includes a hollow rotary shaft that is housed in a head casing and has an impeller attached to its outer periphery, and has a chuck inside the hollow. The handpiece is such that a tool is detachably attached to a chuck, and is characterized in that at least the rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic. Another aspect of the present invention is that a hollow rotary shaft that is housed in a head casing and has an impeller attached to its outer periphery has a chuck in the hollow, and a tool is detachably attached to the chuck. The hand piece is characterized in that the rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic, and other parts are also molded from an inorganic material such as plastic or ceramic. be.

[Effect]

According to the present invention, as described above, the rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic.
Since this and other parts are also molded from inorganic materials such as plastic or ceramic, manufacturing costs can be reduced or high frequency sterilization can be used.

【Example】

FIG. 1 shows an embodiment of a handpiece according to the present invention. In the head head 13 of this handpiece, the head casing 18 is divided into two parts, and at the center of each casing part 18a, 18b in the longitudinal direction, there is a hollow rotating shaft 14, an impeller 15 on the outer periphery, and a stopper for the chuck 17. A portion 17a is integrally molded. In the hollow of this rotary shaft 14, there is a
A chuck spring material 17b is stored, and this spring material 17b
is fixed by the stopper part 17a and a cylindrical stopper 170 inserted from the tool insertion opening side. Two locations on the outer periphery of this integrally molded rotating shaft 14 (in the figure,
A bearing (hair ring mechanism) 19.19 is installed between the upper and lower portions) and the inside of each casing portion 18a, 18b. The bearings 19, 19 consist of a ball 19a, an annular inner part (inner ring) 19b and an outer part (outer ring) 19C that support the ball 19a inside and outside, but in the present invention, each of the casing parts 18a, A sealing annular convex portion 18c is provided at the portion of the 18b that comes into contact with the exterior portion 19c,
18c is provided. Each part (component) of the head 3 formed in this way is made of plastic (including not only ordinary resin but also hard rubber), preferably hard plastic, engineering plastic, and even ceramic. Constructed from a combination of inorganic materials. Therefore, not only the rotating shaft 14, the impeller 15, and the stopper portion 17a of the chuck 17 described above are integrally molded, but also the respective casing parts 18a, 18b and the sealing annular protrusions 18c, 18c are integrally molded. This makes it easier to manufacture each part and at the same time reduces the number of parts, making it possible to significantly reduce costs. Furthermore, this completely non-metallic structure makes it possible to use high frequency sterilization using microwaves, and sterilization can be achieved in an extremely short time (about 20 to 30 seconds). FIGS. 2 and 3 show other embodiments of the handpiece according to the present invention. These handpieces are basically the same as those shown in FIG. It is a provision. The handpiece shown in FIG. 2 uses balls 19a for the bearing 19, and the handpiece shown in FIG. 3 uses columnar rollers 19a' instead of the balls 19a. In any case, this further reduces the number of parts. In the present invention, the structure of the chuck 17, the two-part structure of the head casing 18, the structure of the bearing 19, etc. are not limited to those of the above-mentioned embodiments. In addition, in each of the above embodiments, each part was made of non-metallic, inorganic materials such as plastic or ceramic in order to enable high-frequency sterilization using microwaves. For this purpose, various combinations can be considered for the parts other than the rotating shaft and the impeller, such as metal as in the past, or inorganic materials such as plastic or ceramic.

【Effect of the invention】

As is clear from the above description, according to the present invention, the following excellent effects can be obtained. (1) First, since at least the rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic, mass production is excellent and costs can be reduced. Furthermore, in the case of this integral molding, a part of the stopper for the chuck, an interior part for the bearing, etc. can be easily integrated as needed, so that the number of parts can be significantly reduced. (2) If one head casing is integrally molded from an inorganic material such as plastic or ceramic, the necessary parts,
For example, the annular protrusion for a seal that comes into contact with the exterior part of the bearing can be easily formed, eliminating the need for the conventional O-ring for sealing and the storage groove for this O-ring, which also has excellent mass productivity.
Cost reduction can be achieved. Of course, the parts that house the various parts of the casing (rotating shaft, impeller, bearings, etc.) can be integrally molded without machining, allowing for extremely flexible design. (3) As described above, since the inner part of the bearing can also be used as an integrally molded rotating shaft, the number of parts can be reduced and costs can be reduced. (4) In this way, molding all of the parts from non-metallic inorganic materials such as plastic or ceramics not only reduces costs, but also allows the use of high-frequency sterilization using microwaves, which is extremely important. Benefits can be obtained. As mentioned above, the high frequency sterilization method is completed in about 20 to 30 seconds, and unlike the conventional and commonly used crepe methods, it requires steps such as heating, cooling, and drying (required time, approximately 40 seconds).
minutes to 1 hour) is not required. Therefore, in the past, it took a long time to sterilize each time, so even in small dental clinics, many expensive handpieces were required, and sterilization tended to be incomplete. By providing the non-metallic handpiece of the present invention, a few handpieces are sufficient to ensure thorough sterilization. As a result, the problems of infectious diseases (such as AIDS and hepatitis A), which have become a problem in recent years, will be smoothly resolved. (5) Furthermore, not only is it completely non-metallic, but even partially non-metallic, there are additional benefits such as being lighter, reducing noise such as metallic noise during rotation, reducing vibration, and lubrication. Other benefits include no maintenance required.

[Brief explanation of the drawing]

1 to 3 are longitudinal cross-sectional views of essential parts showing each embodiment of the handpiece according to the present invention, FIG. 4 is an exploded side view showing the entire handpiece, and FIG. 5 is a conventional handpiece. In the figure, which is a vertical cross-sectional view of the main parts of the piece, 13... Head head, 14... Rotating shaft, 15... Impeller, 17... Chuck, 18... ... Head casing, 18c... Annular convex portion for sealing, 19... Bearing, 19a... Pole, 19a'... Columnar roller, 19b... Interior part (inner ring), 19c... Exterior part (outer ring), patent applicant Yoshida Seisakusho Co., Ltd. Figure 3 17C17

Claims (4)

[Claims] (1) A handpiece that is housed in a head casing and has a chuck in the hollow of a hollow rotating shaft with an impeller attached to its outer periphery, and a tool can be detachably attached to the chuck. A handpiece characterized in that at least the rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic. (2) A handpiece that is housed in a head casing and has a chuck in the hollow of a hollow rotating shaft with an impeller attached to its outer periphery, and a tool can be detachably attached to the chuck. The handpiece is characterized in that the rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic, and other parts are also molded from an inorganic material such as plastic or ceramic. (3) A handpiece that is housed in a head casing and has a chuck in the hollow of a hollow rotating shaft with an impeller attached to its outer periphery, and a tool can be detachably attached to the chuck. The rotating shaft and the impeller are integrally molded of an inorganic material such as plastic or ceramic, and the head casing is also molded of an inorganic material such as plastic or ceramic, and the bearing of the rotating shaft of the head casing is A handpiece characterized in that a sealing annular convex portion is provided in a portion that comes into contact with an exterior portion. (4) A handpiece that is housed in a head casing and has a chuck in the hollow of a hollow rotating shaft with an impeller attached to its outer periphery, and a tool can be detachably attached to the chuck. The rotating shaft and the impeller are integrally molded from an inorganic material such as plastic or ceramic, and the head casing is also molded from an inorganic material such as plastic or ceramic, and the rotating shaft is attached to the outer periphery of the rotating shaft. A handpiece characterized by having a bearing inner part.