JPS6132017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present application relates to a connection mechanism for rotatably connecting a main body of a dental treatment instrument and a joint member from which a flexible hose is led out.

Conventional technology and problems Dental handpieces, dental syringes, etc. conventionally used in dental treatment consist of a treatment instrument body and a flexible flexible body connected to a dental unit or treatment chair to supply fluid and electricity to the body of the treatment instrument. and a joint member having a flexible hose, which can be attached and detached and rotated freely via a connecting mechanism so that the flexible hose does not twist during treatment or the treatment is not restricted by the twisting action. However, as the connection mechanism, for example,
As shown in Japanese Patent No. 99994, the main body of the therapeutic instrument to be connected is provided with a fitting cylinder having an annular groove formed on the outer circumferential surface of the end, and the joint member is provided with a fitting cylinder having an annular groove formed on the outer peripheral surface of the end thereof. A retaining ring that fits, a steel ball that is fitted and held in a plurality of through holes provided in the circumferential direction of the retaining ring and has a diameter larger than the thickness of the retaining ring; A connection mechanism is known which includes a slidably operating ring having a small diameter portion that presses a steel ball inwardly and engages the steel ball in the annular groove in the connected state.

However, according to the above configuration, in the disconnected state, the operating ring is in a state in which the spring presses the steel ball inward, so the fitting cylinder cannot be inserted into the retaining ring in this state. When attempting to connect the main body and the joint member, the operating ring must be slid against the spring, and the fitting cylinder must be inserted into the retaining ring in this state.
This operation is the same when detaching the main body from the joint member, and the operation of attaching and detaching the instrument main body and the joint member is troublesome and extremely inconvenient for use. Therefore, the applicant has already filed an application as Utility Model Application No. 54-181243 (Utility Model Application No. 56-98211) for a device for attaching and detaching a dental handpiece that eliminates the inconvenience of use of the conventional handpiece described above. According to this configuration, it is necessary to further connect the flexible hose to the joint member via the connecting device shown in Japanese Utility Model Publication No. 11347/1983, and with this configuration, the total length of the dental instrument is long. There was an inconvenience that made it inconvenient for hand-held operation.

OBJECTS, EMBODIMENTS, AND OPERATIONS OF THE INVENTION The present invention improves the above-mentioned defects of the conventional device, and examples thereof will be described below based on the drawings. The dental treatment instrument shown in the embodiment includes, for example, a main body A having a drive section driven by pressurized air at its tip, and a joint member B having a flexible hose attached to its rear end. As shown in FIG. 2, the main body A is formed of a shaft tube 5, and a holding member 3 is located inside the rear end of the energizing cord 1 whose tip extends to the tip of the main body A at a central position. A fitting cylindrical body 4 which is held by a pipe system 2, 2 for water condensation and air supply, and which has a fitting recess 4a in the rear portion which communicates with the piping system 2, 2. is provided. The fitting recess 4a has a small diameter through hole 4b extending along the axis at its tip.
A conductive terminal 1' connected to the energizing cord 1 is provided in the through hole 4b, and a thin protrusion ring 4c is provided at the rear end of the fitting cylinder 4. A connecting cylinder 6 is provided on the outer periphery thereof concentrically with the fitting cylinder 4, and these are connected to the shaft cylinder 5 by a tightening ring 7 screwed onto the inner periphery of the rear end of the outer cylinder 5. An annular groove 6a is formed around the outer periphery of the connecting tube 6.

On the other hand, as shown in FIG. 3, the joint member B has a circumferential groove 8 formed at a suitable location on the outer periphery, and an air-liquid tight O-ring 9 is fitted into the circumferential groove 8 to fit into the fitting recess of the main body A. an insertion cylinder 1 whose front half is rotatably fitted and connected within 3;
0, and the main body A is provided concentrically on the outer rear half of the insertion cylinder 10, and is thinner than the main body A at the front.
an outer inlet tube 12 having a retaining ring 11 having an inner diameter slightly larger than the outer diameter of the connecting tube 6 and a thin mounting ring 11' projecting from the rear; A slide ring 13 is positioned in the gap between the outer tube 12 and the outer tube 12 so as to surround the retaining ring 11. The operating ring 14 is slidably held in the axial direction, and the cover ring 15 is screwed onto the rear part of the external intubation tube 12.

The operation ring 14 and the slide ring 13 are always urged forward by coil springs 16 and 17, respectively, and the distal end holding ring 11 of the external intubation tube 12 has a plurality of through holes 18 in the circumferential direction. Steel balls 19 having a diameter larger than the wall thickness of the outer tube 12 are fitted and held in the through holes 18, and normally these steel balls 19 are inserted into the outer tube 12.
The slide ring 13 is pushed outward by contacting the outer peripheral surface of the slide ring 13 located inside the slide ring 13.

The operating ring 14 located on the outside of the front half of the external intubation tube 12 has a large diameter portion 20 formed by enlarging the inner diameter on the inner circumferential surface of its front end, and this large diameter portion 20 connects to the small diameter portion via an inclined stepped portion 21. It is connected to 22. Normally, the inclined stepped portion 21 is pushed up by the slide ring 13 and comes into contact with the exposed portion of the steel ball 19 received in the large diameter portion 20 due to the elasticity of the coil spring 16. 14 is prevented from detaching forward from the external intubation tube 12.
Further, the rear end of the slide ring 13 has an inner flange 23 that protrudes inwardly, and this inner flange 23 normally comes into contact with a stopper ring 24 provided on the outer periphery of the insertion cylinder 10 to prevent it from coming off forward. Prevented.

Inside the insertion cylinder 10, there is an air supply path 25 that opens at its tip and communicates with the piping system 2 of the main body A as appropriate.
A water supply channel 26 is provided, and a hole 28 for inserting a power cord 27 is provided in the center, and the tip of the hole 28 is connected to the power cord 27, and is in a male-female relationship with the conductive terminal 1'. A conductive terminal 29 to be joined is provided in a protruding manner. Note that 30 is a water supply connector connected to the water supply channel 26, and a water supply hose 30' is connected to this. Reference numeral 31 denotes an air supply connector connected to the air supply path 25, and an air supply hose 31' is connected to this. 32 is the external intubation tube 1
It is a flexible hose connected to two mounting rings 11', and each hose 30' and 31' and a power cord are housed inside. 33 is a stopper provided at the rear of the small diameter portion 21 of the operating ring 14.

When the main body A is removed from the joint member B, the slide ring 13 pushes the steel balls 19 outward as shown in FIG. When connecting the main body A to the coupling member B from this state, the insertion cylinder 10 is pushed into the fitting recess 3. Then, the connecting tube 6 presses the slide ring 13 against the coil spring 17, and the steel ball 19 falls into and engages the annular groove 7 provided in the connecting tube 6, and the operating ring 1
4 is removed from the steel ball 19, the operating ring 14 moves forward and the small diameter portion 22 presses the outer surface of the steel ball 19, thus bringing the steel ball 19 into engagement with the annular groove 7. is certain, and stopper 3
3 comes into contact with the steel ball 20. In this way, the insertion tube 10 is rotatably fitted into the fitting tube 4 via the O-ring 9, and the outer tube 12 is rotatably connected to the connecting tube 6 via the steel ball 19. Furthermore, a pair of conductive terminals 1' and 29 are slidably joined within the through hole 4b.

The pressurized air from the air supply hose 32' is supplied to the main body A via the air supply path 25, and the water from the water supply hose 31' is supplied to the main body A via the supply channel 26, and the light is turned on via the power cord 27. light bulb 30
The light passes through the optical fiber 1 and reaches the tip of the main body A, illuminating the affected area in the oral cavity.

Next, when separating the main body A from the joint member B, by pulling the operating ring 14 backward against the coil spring 16, the steel balls 19 will face the large diameter portion 20, and from this state, the main body A will be pulled forward. Then, the engagement between the steel ball 19 and the annular groove 7 is released, and the main body A can be pulled out. Along with this pulling operation, the slide ring 13 moves forward by the coil spring 17 and pushes up the steel ball 19 again with its outer peripheral surface, and the operating ring 14
In the retracted state, the steel ball 19 and the inclined stepped portion 21 come into contact with each other, and as shown in FIG. 3, the fitting cylinder 4 and the insertion cylinder 10 can be fitted into each other.

In the above, the insertion cylinder 10 is placed on the main body A side.
In addition, the fitting recesses 4a may be provided on the side of the joint member B, and furthermore, in the above, the holding ring 11, the steel ball 19, the slide ring 13, the operating ring 14, and the springs 16, 17 are provided on the side of the main body A.
Of course, it is also possible to provide the connecting tube 6 having the annular groove 6a on the joint member B side.

Effects of the Invention As described above, according to the present application, when the main body and the joint member are separated by sliding the operating ring, the steel balls pressed inward by the slide ring are exposed to the inner periphery of the operating ring. The provided small diameter portion locks and prevents the operating ring from returning to its original state, and when connecting the main body to the joint member from this state, the fitting cylinder must be inserted into the retaining ring at a length that allows the fitting cylinder to fit into the retaining ring. Since it engages with the groove, it is extremely easy to attach and detach the main body and the coupling member, and since the flexible hose is attached directly to the mounting ring of the coupling member, it is easier to attach and detach the main body and the coupling member. Compared to the case where flexible hoses are connected via a connecting device, the overall length of the treatment instrument is shortened, which has advantages such as ease of hand-held operation.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a longitudinal sectional front view showing a connected state, FIG. 2 is a longitudinal sectional front view showing a part of the main body, and FIG. 3 is a partially longitudinal sectional front view showing a joint member. It is. In the figure, A is the therapeutic instrument main body, B is a joint member, 1 is a current-carrying cord, 1' is a conductive terminal, 4 is a fitting cylinder, 5 is a shaft cylinder, 6 is a connecting cylinder, 7 is an annular groove, 10
1 is an insertion cylinder, 11 is a retaining ring, 11' is a mounting ring, 12 is an external intubation tube, 13 is a slide ring, 1
4 is an operating ring, 16 and 17 are coil springs, 18
19 is a through hole, 20 is a large diameter portion, 21 is an inclined stepped portion, 22 is a small diameter portion, 25 is an air supply path, 26 is a water supply channel, 27 is a power cord, 29 is a conductive terminal, 3
0' is a water supply hose, 31' is an air supply hose, and 32 is a flexible hose.

Claims (1)

[Claims] 1. A fitting cylinder having an annular groove formed on the outer circumferential surface of the end is provided on one of the instrument main body and the joint member to be connected, and the other member is provided with a fitting cylinder having an annular groove formed on the outer circumference of the fitting cylinder. A retaining link that fits together, a steel ball that is fitted and retained in a plurality of through holes provided in the circumferential direction of the retaining link and has a diameter larger than the thickness of the retaining link, and a steel ball that is pressed by a spring and has the A connecting mechanism for a dental treatment instrument comprising a slidably operating ring having a small diameter portion that presses a steel ball inward, and the holding link engages the steel ball in the annular groove in a connected state. A sliding member is provided on the inner periphery of the steel ball, which is always pressed in the direction of the end and presses the steel ball outward in the unconnected state, and which is pressed by the fitting cylinder to release the pressed state of the steel ball in the connected state. A connection mechanism in a dental treatment instrument, characterized in that a flexible slide ring is provided, and a flexible hose having a built-in passage communicating with a working medium passage provided therein is attached to the rear end of the coupling member. .