JPS6090549A - Dental treating instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dental treatment instruments such as dental handpieces, syringes, and scalers that use pressurized fluid.

Conventionally, in dental treatment instruments that have built-in actuators such as a drive motor or a light source for illuminating the treated area in the shaft core, the fluid passages for supplying tip air, cooling air, or water for spraying are driven. The outer circumferential portion 811, which houses an operating body such as a motor or a light source, is bored in the axial direction by utilizing the thickness of the cylindrical body that constitutes the body of the treatment instrument. However, according to this configuration, the wall thickness of the cylinder must be thicker than the diameter of the through hole, which increases the outside diameter of the support cylinder and increases the weight. It was also difficult to drill holes along the length of the hole.

Therefore, the present application solves the above-mentioned disadvantages, and embodiments of the present application will be described in detail below with reference to the drawings.

The embodiment shows a dental handpiece that has an electric motor built into its body and drives a cutting bar with the motor. In the figure, A represents a rotating part (2) that rotates a cutting bar (1) with an electric motor. Handheld part (3) provided at the tip
At the rear end of the dental hand beam, a joint part (5j) connected to the rear end of the flexible hose (4) is connected in a detachable and rotatable manner. A jet nozzle (6) jets water toward the tip of the cutting bar (1).
), and a chip air passage (power and water passage (8)) is provided in the hand-held part (3). An outer cylinder (9) forming the joint part (5) ) in the front end of
A small-diameter insertion tube O that fits tightly into the rear end of the handheld portion (3)
The front member circle Q is extended forward and is tightly fitted through a support ring (1 ring).The front part of the outer cylinder body (9) has an inner circumference protruding to form a thick wall part α, An air chamber (1
41 and an ice chamber tt51 are arranged in parallel, and the air chamber I and the water chamber 0!19 have their respective ends opened on the outer peripheral surface of the insertion tube σ and inserted into the handheld portion (3). Passages (le and (
The rear ends of 17) communicate with each other via communication holes atp and tt't. Fitted into the rear part of the outer cylinder (9) is a shaft-shaped rear member (2) having an air vent (A) and a water vent +211 each opening at the rear surface. , After this, member CI! On the outer periphery of 2 are the air vent ■ and the water vent Qll.
An engagement groove (c) extending in the axial direction facing the tip openings (a) and 011' is formed. Between the front member Ql) and the rear member (22 in the outer cylinder body (9), there is a yoke (2) tightly fitted to the inner surface of the outer cylinder body (9), and a yoke (2) disposed on the inner surface of the yoke (2). A pair of magnetic poles (C) and bearings at both ends (A) located at the shaft core.

A built-in DC motor (7) consists of an armature supported by (a)', a commutator (to) provided on the end face of this armature, and a brush CHI in sliding contact with the armature.
)'s output shaft OD extends into the insertion tube (IIl) of the front cover Qυ, and is provided with a connector (to) at its tip that is transmission-connected to the rotating portion (2) via the rotating shaft 6z. (to) is a fluid passage 081 of the front member αυ which is removably disposed in the outer cylinder body (9). As shown in FIG. 5, this is a flat end piece C3 in which a pair of through holes (G) and @ are arranged in parallel, with the tip opening at the front end surface and the rear end opening at the bottom surface. ?) and this through hole, (a pair of long conduit fields laid low at the tip opening of the opening, C31
As shown in Section 2.3, this channel member θ4) is connected to the through hole C with the end piece C37) engaged with the engagement groove.
The rear end openings 35+ and +361 are connected to the rear member (221
The yoke @'its faces the tip openings (1' and 011' of
The decoy is placed through a gap with the yoke (271).
2) The rear member (〃) is held by the screwing of the rear end of the rear end, and the rear member (〃) is held in the engagement groove @ of the rear member 125. The engaged end piece C1η of the channel member is also held by the inner peripheral surface of the retaining ring curve, and in this state, each end piece has six through holes.

The rear end openings (to) are the front end openings of the rear member (2), respectively.
2)′.

Qv' and QIJ (411t) communicate with each other through the air and water jungle, remove the pipe retaining ring 4 and remove the end piece 13.
By grasping η, the channel member C34 can be pulled out. (42 is a shaft that has an electric contact for supplying electricity to the motor, in addition to an air supply line and a water supply line μ that communicate with the pressurized air and pressurized water led through the supply hose +43. The connection member has a shape of
The outer diameter of the connecting member (42) is gradually reduced in steps toward the rear. The air supply path 1 is joined to the rear surface of the rear member by engagement with the rear end portion.
41 and the water supply channel - communicate with the air vent hole slit and the water vent hole 1211 of the rear member t22, respectively, via a communicating pipe (481). (Push button 151 against the 49fi spring) t
- It is a locking piece that is operated by pressing and allows attachment and detachment from the handheld part (3).

However, the pressurized air is connected to the air supply path (goods) and air vents (a).
, through hole (c), conduit -, air chamber (141, passage (161)
(through force), and the water permeates through the water supply path (c), water passage hole c21+, through hole -, conduit C39, water chamber, passage aη, and passage (8). The mist is guided to the spray nozzle (61) through the spray nozzle (61), and the mist is sprayed from the spray nozzle (6).

As described above, according to the present application, a separately configured flow path member is disposed at the outer circumferential position of the actuating part built into the body of the treatment instrument, and fluid passages are provided in the front and rear members located at the front and rear of the actuating body, respectively. The device has the following advantages: it can reduce the weight and outer diameter of the entire device, making it easier to hold in hand, and it is also easy to configure the fluid passages, which is advantageous in terms of manufacturing. do.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is an overall side view, and FIG. 2 is an overall side view.
The figure is an enlarged vertical cross-sectional view of the joint part, Figure 3 is another enlarged vertical cross-sectional view of the joint part, Figure 4 is an enlarged side view of the joint part with the tooth retaining ring removed, and Figure 5 is an enlarged side view of the joint part. FIG. 3 is an enlarged side view of a flow path member. In the figure, (9) is the outer cylinder, αυ is the front member, 2 is the rear member, (
) is a DC motor, G41 is a flow path member, (351, Seki is a through hole, 6D is an end piece, ff113!It is a guide. Patent applicant: Yoshida Seisakusho Co., Ltd.

Claims (1)

[Scope of Claims] (1) A front member and a rear member each forming a fluid passage are disposed at the front and back positions of the actuating body installed in the outer cylinder constituting the body of the dental treatment instrument, and both ends are A channel member, which is formed by fitting a conduit that communicates with one end of the through hole to the front end of an end piece having an open through hole and guiding it forward, is bridged between the front and rear members to form the through hole. A dental treatment instrument characterized in that the other end of the conduit communicates with a fluid passageway of the rear member, and the free end of the conduit communicates with the fluid passageway of the front member. (2J) The dental treatment instrument according to claim 1, wherein the through hole of the flow path member and the conduit are arranged side by side, and one of them is used for the pressurized air path and the other is used for the waterway. (3) The dental treatment instrument according to claims 1 and 2, wherein the operating body is an electric motor.