JPS5930312Y2 - Connection device in dental handpiece - Google Patents

Description

[Detailed description of the invention] The present application connects a handpiece body equipped with an air turbine in its head and a connecting member equipped with a flexible hose at its rear end for supplying pressurized air, etc. This invention relates to a connecting device for a dental handpiece, which is intended to facilitate the connection operation between the handpiece body and the connecting member, and to ensure airtightness at the connecting portion. be.

A connecting device for a dental handpiece, which conventionally consists of a handpiece body equipped with an air turbine in its head and a connecting member equipped with a flexible hose at its rear end for supplying pressurized air, etc. to the handpiece body. Most of the handpieces were screwed together, making it extremely troublesome to attach and detach the handpiece body to and from the connecting member.Furthermore, no consideration was given to airtightness at the connecting part, so it was difficult to attach or remove the handpiece body from the connecting member when connected. There is a risk that a portion of the pressurized air supplied to the handpiece body may leak at the connection portion, resulting in a decrease in pressure and a decrease in the required rotational speed of the air turbine, thereby impairing the cutting ability.

Therefore, the present application is an attempt to improve such defects, and an embodiment thereof will be described in detail with reference to the drawings below.A handpiece main body A equipped with an air turbine at the tip has a cylindrical handle 1 on the inner periphery of the rear end. A pair of tapered engagement grooves 2, 2, which have an L-shape on the outer periphery of the rear end, and whose short pieces open at the rear end face of the joint pipe 3 and whose long pieces are inclined so as to be separated from the rear end face of the joint pipe 3, are symmetrical. The outer periphery of the front end of a joint pipe 3 formed in the above is threadedly connected, and within this joint pipe 3 are provided an air supply pipe 4 that guides pressurized air that drives the air turbine, and an exhaust pipe that guides the air after driving the air turbine. 5 and, although not shown, a pipe support piece 7 provided through the water supply pipe is fixed.

The air supply pipe 4 and the exhaust pipe 5 extend so as to protrude rearward, and protrude outward along the periphery of a hole a on the outer surface of the pipe support piece 7 through which the pipes 4 and 5 are inserted. A packing 9 having a convex seat 8 is provided so as to overlap.

On the other hand, the connecting member B connected to the rear part of the handpiece body A has the retaining groove 2,
The rear end of a sleeve 12 having engaging pins 11 and 11 protruding from the inner periphery of the tip to engage with the air supply pipe 4 and the exhaust pipe 5 is screwed into the interior 13 of this connecting member B. A connecting body 18 has connecting holes 14 and 15 for air supply and exhaust in the front part and a fitting hole 16 in the rear part, and a flange 19 provided at the middle outer circumference is located at the tip of the cover 10. The fitting hole 16 has an air passage 20 that is connected to the front end of a flexible hose 17 and receives pressurized air supplied from the hose 17. The distal end of the hose joint 21 is rotatably fitted through an 01J ring 22.

23 is a communication hole that communicates the air passage 20 with the air supply connection hole 14; 24 is an exhaust port provided at the end of the exhaust connection hole 15;
25 is a water supply pipe.

In the above, it is of course possible to provide the engagement pins 11, 11 on the joint tube 3 side of the handpiece body A, and the tapered engagement grooves 2, 2 on the sleeve 12 side of the connection member B, respectively. .

Thus, the engagement pins 11° 11 of the connecting member B face the open end of the tapered engagement groove 2.2 of the handpiece body A, and the air supply pipe 4 and the exhaust pipe 5 are connected to the connection holes 14 and 15, respectively.
When the coupling tube 3 is fitted into the sleeve 12 so as to face the sleeve 12 and either one is rotated approximately 90 degrees from this state, the engagement pin 11.11 is guided by the long piece of the tapered engagement groove 2, 2, reaching its terminal end, thereby connecting holes 14 and 15
The air supply pipe 4 and the exhaust pipe 5 enter therein, and the front end surface of the connection body 18 comes into pressure contact with the gasket 9.

In this case, the convex seat 8 is particularly strongly pressed and deformed by the opening edges of the connection holes 14 and 15 due to the inclination of the long pieces of the tapered engagement grooves 2, 2, and the suppressing deformation of the convex seat 8 causes the seal 9
between the hole a and the air supply pipe 4 and the exhaust pipe 5, and between the connection hole 14 and the air supply pipe 4, and between the connection hole 15 and the exhaust pipe 5.
Any gaps that may exist between the two are reliably sealed,
Therefore, for example, the pressurized air supplied to the air supply connection hole 14 is transferred between this and the air supply pipe 4, between the gasket 9 and the connection body 1.
8 and between the exhaust connection hole 15 and the exhaust pipe 5, and there is no risk of direct leakage to the exhaust side, and the supplied pressurized air is not depressurized. It can be effectively used to drive the turbine, and since the connecting body of the connecting member is rotatably supported inside the cylindrical cover, for example, the connecting member can be used to connect the connecting member to the handpiece body. Even when the rotation operation is performed, only the cylindrical cover rotates, and the connection body moves separately toward the handpiece body without rotating, so even if the air supply pipe and the connection hole are installed in an eccentric position, The connection can be made without any problems, and there is no danger that the flexible hose will be twisted, and the connection operation can be easily performed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially omitted longitudinal cross-sectional side view of the handpiece body, FIG. 2 is a plan view of the same, and FIG.
FIG. 3 is a partially omitted longitudinal side view of the connecting member, and FIG. 4 is a longitudinal side view showing the connected state. In the figure, A is the handpiece body, 2 is a tapered engagement groove, 3 is a joint pipe, 4 is an air supply pipe, 5 is an exhaust pipe, 7 is a pipe support piece, 8 is a convex seat, 9 is a packing, a is a hole, B is a connection member, 11 is an engagement pin, 14° and 15 are connection holes, 18 is a connection body, and 21 is a hose joint.

Claims (1)

[Scope of utility model registration request] On the outer periphery of the joint pipe 3 provided at the rear end, there is a pair of tapers that are L-shaped, the short pieces thereof opening at the rear end face of the joint pipe 3, and the long pieces slanting away from the rear end face of the joint pipe 3. Engagement groove 2
.
A handpiece main body A is formed by superimposing a gasket 9 on the outer surface of which a convex seat 8 facing outward is provided along the periphery of the hole a through which the pipe 4 is inserted, and the tapered engagement groove 2.
A connecting hole 14 into which at least the air supply pipe 4 is fitted is provided in the front part of the cylindrical cover, which has a sleeve having retaining pins 11. A cylindrical connection that rotatably supports a connection body 18, each of which has hose joints 21 at its rear that receive pressurized air supplied from a flexible hose 17 and guide it to the air supply connection hole 14. By rotating the engagement pin 11.11 into the pair of tapered engagement grooves 2゜2, the convex seat 8 is pressed by the opening edge of the connection hole 14. A connecting device for a dental handpiece configured to be deformed.