JP2537358B2 - Dental treatment equipment - Google Patents

Description

TECHNICAL FIELD The present application relates to dental treatment instruments.

2. Description of the Related Art Conventionally, a working medium flow passage is provided inside and at the rear,
A hand-held member that is provided with a fitting recess and a connecting cylinder that projects rearward and has an annular groove on the outer periphery, and is rotatably fitted to the fitting recess at the front part, and has a working medium supply path inside. A mixing shaft cylinder provided with and an outer insertion tube concentrically located on the outer periphery thereof are provided, and a spherical body engaging with the annular groove is movably held in a through hole formed in the outer insertion tube and Between the inner circumference of the intubation and the outer circumference of the fitting shaft cylinder, when the fitting shaft cylinder is fitted into the fitting recess by being elastically pressed forward, the sphere is pushed outward, and the connecting cylinder. A sliding ring that is pushed rearward by means of the above, and a large-diameter portion and a small-diameter portion that are continuously connected to the outer circumference of the outer insertion tube, the inner surface of the front end, and the inclined step portion are always elastically pressed forward. A joint member that is provided with a ring slidably mounted and a flexible hose for supplying a working medium connected to the rear end. Dental treatment instrument constructed from, for example, Japanese Patent Publication 61-10131, JP-known in such same 61-30574 JP.

DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention However, according to the above-described conventional configuration, in the relationship between the connection tube for rotatably connecting the hand-held member and the joint member, the sphere, and the operation ring, the sphere is Since it slightly floats between the annular groove of the connecting cylinder and the small diameter portion of the operation ring, the rotating function at that portion is insufficient, and the turning force of the hand-held member is often the joint member. Therefore, the flexible hose is twisted, and the smooth operability of the hand-held member is lost.

Means for Solving the Problems In the present application, therefore, the present invention relates to a hand-held member that includes a fitting recess and a connecting tube that has an annular groove on the outer periphery and projects rearward, and the fitting recess on the front. And a fitting shaft tube that is rotatably fitted in and an outer insertion tube that holds a spherical body that fits in an annular groove of the connection tube so as to be free to move along the circumference at the time of connection, and the outer circumference of the outer insertion tube. A dental treatment instrument comprising a joint member slidably fitted with an operation ring for pressing the spherical body into an annular groove, and a flexible hose connected to a rear portion thereof, wherein Defects of the above-mentioned conventional ones by separating the extrapolation tube and engaging them with a ball bearing, and connecting a flexible hose to the rear portion of the fitting shaft cylinder directly or through a connecting cylinder. Is an improvement.

Operation However, in use, when the fitting shaft cylinder is fitted into the fitting recess, the spherical body fits in the annular groove of the connection cylinder, and the hand-held member and the joint member are rotatably connected. Dental treatment is performed by holding the hand-held member.

In this case, the turning force acting on the hand-held member is absorbed between the spherical body and the annular groove of the connecting cylinder and is not transmitted to the joint member, but when the turning force is not sufficiently absorbed, the joint member The rotation force is transmitted to the extrapolation tube holding the sphere, but since the extrapolation tube and the fitting barrel are connected by the ball bearing, the rotation force transmitted to the extrapolation tube is transmitted by the ball bearing. There is no risk of the flexible hose being twisted when it is shut off.

Example Hereinafter, an example of the present application will be described in detail with reference to the drawings. The hand-held member A is composed of a tubular body (1) and has a drive section driven by, for example, pressurized air at its tip, A fitting concave portion (4) provided with an optical fiber (2) and a pressurized air passage (3), extending deeply in the axial direction in the rear part, and facing the rear end face of the optical fiber (2) at the rear end face.
And a connecting tube (6) protruding rearward and having an annular groove (5) formed on the outer circumference of the tip. The joint member B is
A peripheral groove (9) is provided at the front end portion, which is forwardly protruded from the center portion, is provided with an illumination lamp (7) at the front end, and is partitioned at a proper position on the outer periphery through an O-ring (8) for gas-liquid tightness. And a fitting shaft cylinder (12) rotatably fitted in the fitting recess (4) with a pressurized air supply path (10) and an electric path (11) arranged inside, and the outer circumference thereof. And an outer insertion tube (15) provided concentrically with a through hole (14) for holding a plurality of spheres (13) movably along the periphery of the front end, and
Between the inner circumference of the outer insertion tube (15) and the outer circumference of the fitting shaft cylinder (12), a spring (16) is constantly urged forward to push the sphere (13) outward, When the fitting shaft cylinder (12) is fitted into the fitting recess (4), a sliding ring (17) made of a ball bearing is pressed by the connecting cylinder (6) rearward.

Further, on the outer circumference of the outer insertion tube (15), a large-diameter portion (19) and a small-diameter portion (20) are formed on the inner surface of the front end through an inclined step (18).
And an operating ring (22), which is continuously connected with the spring and is elastically biased forward by a spring (21), is slidably provided, and at the rear end of the fitting shaft cylinder (12). Is connected to a flexible tube (23) for supplying pressurized air at the rear part, and has a pipe line (24) and the electric line (11) communicating with the compressed air supply line (10) inside. Wire pipe for connecting (2
A connecting cylinder (26) having the respective 5) is further connected to the rear end of the outer insertion tube (15) with a cover ring (28) via an intermediate ring (27). As shown in FIG. 2, the sphere (13) is pushed outward by the sliding ring (17) between the hand-held member A and the joint member B thus configured,
From the state in which it is engaged with the large diameter portion (19) of the operation ring (22), while pressing the sliding ring (17) from the front side, the connection cylinder (6) of the hand-held member A is moved to the fitting shaft cylinder ( 12) and extrapolation tube (15)
And the fitting shaft tube (12) in the fitting recess (4).

Then, the sliding ring (17) is pressed rearward against the spring (16), and the operation ring (22) elastically pressed forward causes the spherical body (13) to receive a pressing force on the lower surface thereof. The lower part fits into the annular groove (5) of the connecting tube (6), and the upper part of the sphere (13) engages with the small diameter part (20) of the operation ring (22), and further the illumination lamp (7). Faces the rear end face of the optical fiber (2).

Although the above is basically the same as the conventional dental treatment instrument, the present application is characterized in that a ball bearing is mounted between the fitting shaft tube and the extrapolation tube in the above-mentioned configuration. Is. Specifically, the fitting shaft cylinder (12) and the outer insertion tube (15) that were conventionally formed integrally are separated, and the ball bearing ( By fixing the outer ring of the ball bearing (30) to the inner ring of (30) and to the rear inner peripheral surface of the outer insertion tube (15) respectively, the fitting shaft tube (12), the connecting tube (26), and the flexibility. A joint member B is configured by rotatably coupling an integrated body composed of a hose (23) and an integrated body composed of an outer insertion tube (15), an intermediate ring (27) and a cover ring (28). .
In the figure, (31) is a retaining ring for the outer ring of the ball bearing (30).

Then, holding the hand-held member A by hand, as in the conventional case,
When operating for dental treatment, the turning force of the hand-held member A is absorbed between the sphere (13) and the annular groove (5) of the connecting tube (6) and is not transmitted to the joint member B.

However, as described above, when the rotational force is not sufficiently absorbed between the spherical body (13) and the annular groove (5), the rotational force of the hand-held member A is the external insertion tube (15) and the intermediate portion. It acts on the integrated body composed of the ring (27) and the cover ring (28), and the turning force acting on this integrated body is
Since it is blocked by the ball bearing (30), the ball bearing (30) does not transmit it to the other integrated body, and therefore, there is no fear that the flexible hose (23) will be twisted by the hand-held operation of the hand-held member A.

EFFECTS OF THE INVENTION Since the present application is configured as described above, when performing a treatment operation while holding the hand-held member in the dental treatment, the turning force of the hand-held member is between the hand-held member and the joint member. Also, there is no fear that the flexible hose is twisted by being absorbed between the fitting shaft cylinder and the extrapolation tube in the joint member, and the treatment operation by the hand-held member can be performed lightly. Have.

[Brief description of drawings]

The drawings show the embodiments of the present application. FIG. 1 is a partial sectional view showing a connected state of a hand-held member and a joint member, and FIG. 2 is a sectional view of the joint member. In the figure, A is a hand-held member, B is a joint member, (4) is a fitting recess, (5) is an annular groove, (6) is a connecting cylinder, (12) is a fitting shaft cylinder, and (13) is a sphere. (15) is an extracorporeal tube, (17) is a sliding ring, (22) is an operation ring, (23) is a flexible tube,
(26) is a connecting tube.

Claims (1)

(57) [Claims] 1. A hand-held member, which is provided with a fitting recess and a connecting tube that has an annular groove on the outer periphery and projects rearward, respectively.
A fitting shaft tube that is rotatably fitted in the fitting recess, and an outer insertion tube that holds a spherical body that fits in the annular groove of the connection tube so as to be movable along the circumference at the time of connection A dental treatment comprising a joint member which is provided with an operation ring for pressing the sphere into an annular groove, is slidably fitted to the outer circumference of the extrapolation tube, and a flexible hose is connected to the rear part. In the device, the fitting shaft tube and the extrapolation tube are separated, and they are engaged with each other by a ball bearing, and a flexible hose is connected to the rear portion of the fitting shaft tube directly or through a connecting tube. A dental treatment instrument characterized in that