JPH0938112A - Dental suction hood device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain easy handling and to easily change the position and direction of a suction hood. SOLUTION: In a dental suction hood device in which the suction hood 8 is mounted on a connection cylinder 2 connected to the terminal part of a flexible duct 1, the connection cylinder 2 is provided with a fixed connection cylinder 2A fixed on a flexible duct 1 side, and a rotary connection cylinder 2B on which the suction hood 8 is mounted. The fixed connection cylinder 2A and the rotary connection cylinder 2B are connected with each other freely relatively rotatably with a prescribed friction force in a circumferential direction mutually as forming one pipeline, and the axis of the connection part of the fixed connection cylinder 2A and the rotary connection cylinder 2B forms an inclination against the axis of the suction hood 8.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a dental suction hood device.

[0002]

2. Description of the Related Art A suction hood, which is directed to a treatment area of a patient during dental treatment, is attached to a connecting cylinder provided at an end of a flexible duct so that a desired position and orientation can be obtained. Operates the suction hood to set the desired position and orientation by the deformation of the flexible duct. Then, in order to maintain the desired position and orientation, for example, as disclosed in Japanese Utility Model Publication No. 4-31051, a plurality of ordinary pipe materials are connected by a flexible duct, and the flexible duct is provided on a side portion thereof. A hinge is provided, and each hinge is connected by an arm member so that a desired position and orientation can be obtained by rotating the hinge, and the position and orientation are maintained by frictional force at the hinge.

[0003]

However, since the pipe line formed by the pipe material and the flexible duct is long and the hinges provided at a plurality of positions are also long, the hinges are made of the pipe material, the flexible duct, A large moment acts due to the weight of the connecting cylinder and the suction hood. Therefore, in order to maintain the suction hood in the desired position and orientation, the friction torque at the hinge must be greater than the moment. Otherwise, the position and orientation of the suction hood will gradually change due to the moment. If the friction torque is a large hinge, a dentist or the like is required to operate with a large force when the position and the direction of the suction hood are to be changed. Further, the structure for connecting the hinge and the arm member is relatively complicated, which makes manufacturing and maintenance troublesome.

The suction hood needs to be separated from the treatment site many times or slightly, or the direction of the suction hood needs to be changed, and the above-mentioned problems are involved each time. However, when treating, it is often necessary to return to the same position and orientation as before, and it is possible to easily change the position and orientation of the suction hood only by the hand of the suction hood without moving the long conduit. desirable.

It is an object of the present invention to provide a dental suction hood device that can meet such demands.

[0006]

In the dental suction hood device of the present invention, the suction hood is attached to the connecting cylinder connected to the end of the flexible duct. As a mechanism for largely moving the position of the suction hood, it is possible to use the above-mentioned mechanism in which a conventional pipe material and a flexible duct are connected to each other and a hinge is provided on the flexible duct and supported by an arm.

In the present invention, when the position and the direction of the suction hood are slightly changed, in order to eliminate the need for the operation of the above-mentioned mechanism, a fixed connecting cylinder is used as a connecting cylinder for connecting the suction hood to the end of the flexible duct. And a connecting cylinder having a rotating connecting cylinder. The fixed connecting cylinder is fixed to the end of the flexible duct, and the rotary connecting cylinder to which the suction hood is attached makes relative rotation with a predetermined frictional force in the circumferential direction so as to form one conduit with the fixed connecting cylinder. It is freely connected to the fixed connection tube. Here, the predetermined frictional force is a frictional force that can maintain its position and orientation without rotating the rotary connecting cylinder relative to the fixed connecting cylinder due to the weight of the rotary connecting cylinder and the suction hood attached thereto. Say. The smaller this frictional force, the more desirable. The axis of the connecting portion between the fixed connecting cylinder and the rotary connecting cylinder forms an inclination angle with the axis of the suction hood. Therefore, a dentist or the like can change the position and orientation of the suction hood simply by rotating the suction hood around its axis. At that time, the position and posture (direction) of the range from the fixed connection tube to the flexible duct are not changed. That is, a dentist or the like can change the position and the direction of the suction hood only by applying a rotational force that resists the frictional force between the fixed connection cylinder and the rotary connection cylinder, and the position and the orientation can be maintained only by this frictional force. To be done.

The inclination angle is not particularly limited, but is 45 depending on the desired position and the desired orientation.
It is thought that it is common to set it at a degree.

It is desirable that the connecting portion between the fixed connecting cylinder and the rotary connecting cylinder has a fitting cylindrical surface, and a seal is provided there. In addition, a locking groove is provided in one of the fixed connection cylinder and the rotary connection cylinder, and the other end projects into the peripheral groove to generate the above-mentioned predetermined frictional force between the peripheral groove and the peripheral groove. For example, it is preferable to use a screw body or the like.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view of the dental suction hood apparatus of the present invention taken along a plane passing through the axis.

In the apparatus shown in FIG. 1, the connecting tube 2 connected to the flexible duct 1 is composed of two members, a fixed connecting tube 2A and a rotary connecting tube 2B, and has an inclination angle with respect to the axis of a suction hood 8 described later. They are joined to each other so that they can rotate and cannot come off. The fixed connecting tube 2A is fixed to the end of the flexible duct 1 with a screw 3. The rotary connecting cylinder 2B has an O-ring 4 for sealing on a fitting cylindrical surface loosely fitted to the fixed connecting cylinder 2A, and a peripheral groove 5 is formed adjacent to the O-ring 4. Set screws 6 as locking members are threadedly attached to the fixed connecting cylinder 2A at a plurality of appropriate positions in the circumferential direction, and the threaded portions enter into the circumferential groove 5 of the rotary connecting cylinder 2B. The tip of the threaded portion of the set screw 6 is in contact with the slide ring 7 arranged in the circumferential groove 5 so that the rotary connecting cylinder 2B can rotate with a predetermined frictional force.
Here, the predetermined frictional force means the once set rotary coupling cylinder 2B.
However, the frictional force is such that the position and orientation of the rotary connecting cylinder 2B do not change due to the moment generated by the weight of the rotary connecting cylinder 2B and the suction hood 8 attached thereto, and the smaller the better. Thus, the rotary connecting cylinder 2B does not come off from the fixed connecting cylinder 2A in the axial direction by the set screw 6, and the set screw 6 can slide on the slide ring 7 in the circumferential groove 5, so that the rotary connecting cylinder 2B is fixed. It is rotatable relative to the connecting cylinder 2A, and thus the position and orientation of the rotating connecting cylinder 2B can be freely set by rotating the rotating connecting cylinder 2B with respect to the fixed connecting cylinder 2A.

The inclination angle can be determined by the amount of change in the position and direction of the suction hood 8, but is generally about 45 ° as shown.

The tip portion of the rotary connecting cylinder 2B has a cylindrical portion 2C into which the suction hood 8 is fitted.

The suction hood 8 has a conical portion 8A and a cylindrical portion 8B.
And Further, a flange portion 8C is provided at a boundary portion between the conical portion 8A and the cylindrical portion 8B, and the flange portion 8C abuts on the tip of the rotary connecting cylinder 2B of the connecting cylinder 2 to fix the position at the time of fitting. I'm supposed to decide. In this example,
An annular protrusion 8D is formed on the inner edge of the large-diameter side opening of the conical portion 8A of the suction hood 8 to prevent dripping of saliva or the like attached to the inner surface of the suction hood 8 after being sucked during treatment. ing. Further, as shown in FIG. 2 showing the direction of arrow A in FIG. 1, a lattice-shaped screen 9 is provided in the suction hood 8 to prevent large foreign matter from entering. The cross section of the screen 9 is tapered back and forth as shown in FIG. 1 in order to reduce the suction resistance as much as possible.

In the cylindrical portion 8B of the suction hood 8, a peripheral groove 10 having a substantially semicircular cross section is formed on the outer peripheral surface of the fitting which is fitted with the cylindrical portion 2C of the rotary connecting cylinder 2B. .

On the other hand, the cylindrical portion 2C of the rotary connecting cylinder 2B for receiving the cylindrical portion 8B of the suction hood 8 has a plurality of circumferential positions (three positions in FIG. 3, which is a sectional view taken along the line III-III in FIG. 1). The window portion 11 is formed. A locking ring 12 is fitted to the cylindrical portion 2C of the rotary coupling cylinder 2B so as to pass through the three window portions 11.

The locking ring 12 is a ring having elasticity so that it can be extended in the circumferential direction and its outer shape can be changed. In the illustrated example, the locking ring is formed by connecting both ends of a coil spring with a short pin 12A or the like, but the invention is not limited to such a form and may be a rubber ring or a synthetic resin ring. However, since the locking ring plays a role of locking the rotary coupling tube 2B and the suction hood 8 in addition to the above-described expandability or deformability of the outer shape, it is preferable to determine it in consideration of a certain strength. . The locking ring 12 is the circumferential groove 1 of the suction hood 8.
It has a thickness larger than the depth of 0, and is locked when it is fitted into the tubular portion 2C of the rotary connecting tube 2B so as to pass through the window 11 of the rotary connecting tube 2B. Ring 12
Due to the elasticity of the suction hood 8, a part of the suction hood 8 is immersed in the window portion 11 and locked in the circumferential groove 10 of the suction hood 8 so that the suction hood 8 does not come off from the rotary connecting cylinder 2B in the axial direction.

A lock ring 13 is supported on the cylindrical portion 2C of the rotary connecting cylinder 2B so as to be movable in the axial direction as shown in FIG. The lock ring 13 is movable within a range where it abuts the flange portion 8C of the suction hood 8 and the step portion 14 formed on the cylindrical portion 2C. A locking annular groove 13A is formed on the outer peripheral surface of the lock ring 13 so that a dentist or the like can move the lock ring 13 conveniently.

When the lock ring 13 is in the position shown in FIG. 1, the lock projection 15 as a lock portion for preventing outward deformation of the lock ring 12 in the window 11 is provided on the inner circumference. (See also FIG. 3 and FIG. 4 showing the lock ring in the direction of arrow B in FIG. 1). Further, the lock ring 13 corresponds to the locking ring 12 in the axial direction when the lock ring 13 moves from the position in FIG. 1 to the position where the left end of the lock ring 13 abuts on the step portion 14 of the rotary coupling cylinder 2B. A V-shaped receiving groove 16 is formed in an annular shape at the position where it comes to the position. On the other hand, in FIG. 1, an annular release protrusion 17 adjacent to the circumferential groove 10 is formed on the left side of the circumferential groove 10 in the cylindrical portion 8B of the suction hood 8.

As described above, the lock ring 13 located on the right side as shown in FIG. 1 is engaged with the circumferential groove 10 of the suction hood 8 and the window 11 of the rotary connecting tube 2B. Since the ring 12 cannot be removed from the circumferential groove 10,
Although the suction hood 8 is rotatable, it does not come off from the rotary connecting cylinder 2B even if it is strongly pulled forward.

When removing the suction hood 8, the procedure is as follows.

First, the dentist or the like moves the lock ring 13 to the left as shown in FIG. The receiving groove 16 formed on the inner surface of the lock ring 13 comes to the position of the locking ring 12 in the axial direction. That is, the lock projection 15 that holds the locking ring 12 inward in the radius.
Is disengaged from the locking ring 12, and a space is formed on the outer periphery of the locking ring 12 for the locking ring 12 to be deformed.

In this state, the suction hood 8 as shown in FIG.
When is pulled to the right, the release protrusion 17 formed on the suction hood 8 pushes the locking ring 12 outward through the window 11 to return the locking ring 12 to a circular shape, and the locking is stopped. When released, the suction hood 8 can be easily taken out from the rotary connecting cylinder 2B.

When the suction hood 8 is attached to the rotary connecting cylinder 2B again, the above procedure may be carried out in the reverse order.

[0026]

As described above, according to the present invention, it is possible to simply rotate the rotary connecting cylinder to which the suction hood is attached, without moving the flexible duct portion at all.
Since the position and the direction of the suction hood can be easily changed, the position and the direction are stable, and the dentist's operational burden is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a dental suction hood device of the present invention.

FIG. 2 is a view of the suction hood of the apparatus shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a view of the lock ring of the device of FIG. 1 as seen in the direction of arrow B in FIG.

5 is a cross-sectional view when the lock ring is moved to a release position for removing the suction hood of the device shown in FIG. 1;

6 is a cross-sectional view when the suction hood is pulled out and the locking ring is unlocked to take out the suction hood from the state of FIG. 5;

[Explanation of symbols]

 1 Flexible Duct 2 Connection Tube 2A Fixed Connection Tube 2B Rotation Connection Tube 6 Locking Member (Set Screw) 8 Suction Hood 10 Circumferential Groove

Claims (3)

[Claims] 1. A dental suction hood device in which a suction hood is attached to a connecting tube connected to an end of a flexible duct, wherein the connecting tube includes a fixed connecting tube fixed to the flexible duct side and a suction tube. A rotary coupling cylinder to which the hood is attached, and the fixed coupling cylinder and the rotary coupling cylinder are connected to each other so as to be rotatable relative to each other with a predetermined frictional force in the circumferential direction while forming one pipeline. A dental suction hood device, wherein the axis of the connecting portion of the rotary connecting cylinder forms an inclination angle with respect to the axis of the suction hood. 2. The dental suction hood device according to claim 1, wherein the inclination angle is about 45 °. 3. The connecting portion between the fixed connecting cylinder and the rotary connecting cylinder has a fitting cylindrical surface, and the fitting cylindrical surface is provided with a seal and surrounds one of the fixed connecting cylinder and the rotary connecting cylinder. A groove is formed and a locking member is provided on the other side so as to project into the circumferential groove, and the locking member is movable in the circumferential direction with respect to the circumferential groove with a predetermined frictional force. Item 1. The dental suction hood device according to Item 1.