JPS5837371Y2 - Connection device between dental handpiece and supply pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device capable of rotatably connecting a dental handpiece and a supply tube to each other with a one-touch operation.

Conventionally, when a dentist or the like performs dental treatment by holding a handpiece, the flexible supply tube connected to the handpiece can be kinked, causing wrist fatigue and preventing the risk of making treatment work difficult. Various coupling devices have been proposed in which a hand piece and a supply tube can be rotatably coupled to each other.

For example, it is already known from Japanese Utility Model Publication No. 50-11347, an improvement of the invention disclosed in this publication from Japanese Utility Model Publication No. 53-15196, and furthermore, Japanese Patent Publication No. 54-56292.

However, the coupling devices disclosed in these publications, for example, in the case of Utility Model Publication No. 53-15196, have a free rotation mechanism via an O-ring, but when attaching and detaching the supply tube and handpiece, it is necessary to loosen the screws, It is fastened with screws.

In the case of Japanese Patent Publication No. 54-56292, the joint part of the handpiece is fitted into the joint part of the flexible supply tube, and an O
The ring is rotatably connected to the handpiece joint and the flexible supply pipe joint using frictional force, ensuring airtightness between the air supply system path and water injection system path at the connection area. In order to prevent the band piece from accidentally coming off, the tightness of the O-ring must be increased, which naturally makes it difficult for the band piece and the supply pipe to rotate freely, making the connection operation difficult.

On the other hand, in order to facilitate free rotation between the band piece and the supply pipe, it is necessary to reduce the tightness of the O-ring, which has the paradoxical drawback that the connection between the band piece and the supply pipe is likely to come off. It had

The present invention was completed in order to improve the above-mentioned drawbacks of the conventional coupling device of this type, and its purpose is to connect the band piece and the supply pipe with a one-touch operation. To provide a device in which a band piece and a supply pipe can be smoothly and rotatably connected to each other without being accidentally separated after being connected.

Hereinafter, the present invention will be described in detail.The present invention will be described in detail as follows: A connecting device for connecting a dental band piece and a supply pipe according to the present invention (hereinafter referred to as the present invention device).

) has a structure in which the conventional coupling device of this type utilizes the elastic force of an O-ring to insert and connect the band piece supply pipe in a rotatable manner. A mechanism for attaching and detaching with a so-called one-touch operation (hereinafter referred to as one-touch attachment/detachment mechanism), in which the band piece is inserted into the supply pipe after sliding a sleeve loosely fitted to the rear end of the cylinder.

), and a mechanism (hereinafter referred to as a free rotation holding mechanism) that rotatably connects and holds the band piece and the supply pipe.

), and these are configured separately from each other.

That is, the sleeve, which is slidably fitted loosely on the outer periphery of the rear end of the band piece, is slid toward the band piece or the opposite direction (these sliding directions can be arbitrarily selected depending on the structure of the sleeve). By this, the plurality of locking balls provided in the sleeve are made to protrude outward from the plurality of ball holes provided in the band piece outer cylinder with respect to the axis, and the locking balls provided in the sleeve extend from the rear end of the band piece. After the male part is inserted into the female part protruding in the axial direction from the tip of the supply pipe to connect the band piece body and the supply pipe, the sleeve is moved by the elasticity of the spring installed inside the sleeve. Returning to the original position by itself, the locking balls are projected from the ball hole in the axial direction, and these locking balls are fitted and locked into the ring-shaped ball receiving groove provided on the outer periphery of the female part of the supply pipe. (Installation operation).

Therefore, unless the sleeve is slid in the same direction as the mounting operation (removal operation), the fitting lock is maintained, and the connection between the band piece and the supply pipe does not come off (locking function). The male part of the band piece and the female part of the supply pipe, which are inserted and connected, maintain a mutually rotatable connected state (free rotation holding function).

Next, preferred embodiments of the device of the present invention which can function as described above will be described in more detail.

The one-touch attachment/detachment mechanism with the locking function described above consists of a bandpiece outer cylinder 11 provided with a plurality of ball holes 13 in the same circumferential direction at the rear end of the bandpiece main body 1, and A locking ball 44 that is slidably and loosely fitted onto the outer cylinder 11 and provided internally on the same circumferential surface is connected to a ball that is bored on the same circumferential surface of the band piece outer cylinder 11. Hole 13
When the male part 5 extending from the rear end of the sleeve 4 and the band piece 1, which can be retracted and protruded from the sleeve 4, is inserted and connected to the female part 3 of the supply pipe 2, the locking ball 44 of the sleeve 4・・・
The female portion 3 is formed to fit and lock with...
A circumferential groove 21 is provided on the outer periphery of the groove.

The sleeve 4 has a cavity 45 and an elastic spring 42 on its inner surface, and the elasticity of the elastic spring 42 constantly presses two collar rings 431 and 432 that support the balls 44 from both left and right ends. However, when the sleeve 4 is not slid, the balls 44 are always projected in the axial direction from the ball hole 13 of the band piece outer cylinder 11.

(See Figure 1, which shows the state before the band piece is connected to the supply pipe).

A cavity 45 provided on the inner periphery of the sleeve 4 engages the locking balls 44 when the sleeve 4 is slid in the direction A from the state shown in FIG. 1 and the male or female portion is pulled out. Moreover, when the locking balls 44 are fitted into the holes 45, the locking balls 44 are inserted through the ball holes 13 provided in the band piece outer cylinder 11, respectively. 44 in the opposite direction with respect to the axis, and a recessed portion large enough to enable a connecting operation between the male portion 5 extending at the rear end of the band piece 1 and the female portion 3 provided at the tip of the supply pipe 2. (See Figure 2).

Therefore, by sliding the sleeve 4 in the direction A in FIG. 1, the locking balls 44 are placed in a state where they can fit into the cavity 45 (see FIG.
By moving the ball 44 in the direction A in Figure 2 (in the direction of the opening in the figure when the band piece 1 is fixed)
. . . easily fit into the cavity 45, and the insertion and connection and detachment operations between the male portion 5 of the band piece 1 and the female portion 3 of the supply pipe 2 are easily performed.

Furthermore, the free rotation holding mechanism includes the inner peripheral surface of the female part 3 provided at the tip of the supply pipe 2, and the male part 5 extending to the rear end of the band piece 1 configured to be inserted into the female part 3. O-rings 302, 303 and 3 are attached to the joint surface between the outer circumference of the female part 3 and the inner circumference surface of the band piece outer cylinder 11, respectively.
O-ring grooves 102 and 103 are provided at appropriate locations on the outer periphery of the male portion 5 in order to insert O-ring grooves 102 and 103, and O-ring grooves 201 are provided at appropriate locations on the outer periphery of the female portion 3.
, 103 and 201, respectively, and by sliding the sleeve 4 as described above, the ball holes 13 of the band piece outer cylinder 11...
The cross-section of the ring-shaped ball receiving groove 21 and the shape of the ball hole 13, which are fitted with the more protruding locking ball 44, are adjusted to reduce the sliding frictional force between the locking ball 44 and the ball hole 13. It is constructed by forming it into a small approximately circular arc shape.

Therefore, even when the locking ball 44 is in a state where it is fitted and locked in the ball receiving groove 21, the band piece main body including the male part 5 and the band piece outer cylinder 11 and the supply pipe having the female part 3 at the tip It will be easily understood that they are rotatably connected to each other with a light force.

The band piece outer cylinder 1 at the rear end of the band piece and the O-ring inserted as appropriate at the joint surface between the male part 5 and the female part 3 provided at the tip of the supply pipe 2 connect the band piece and the supply pipe. It must be inserted in a place where the airtightness of each thread path such as the air supply system path and water injection system path in the section is maintained completely, but this is not possible with the connection device between the band piece and the supply pipe. These are the absolute minimum conditions that must be satisfied as a matter of course, and are common technical knowledge of those skilled in the art, so the details are omitted (see Figures 1 and 2). A structure for rotatably connecting a band piece and a supply pipe using a ring-shaped exhaust groove 22 and a water injection air mixing groove 23 is also known, and since it is not the gist of the present invention, the details will be omitted.

1 and 2 (FIG. 1 shows the state before the sleeve 4 is slid in the A direction, and FIG. 2 shows the state after the sleeve is slid in the A direction, respectively.

) is an embodiment in which the band piece 1 and the supply pipe 2 are connected by sliding the sleeve 4 in the A direction, but conversely, the sleeve 4 is slid in the B direction. When adopting a mode in which the locking ball 44 is connected by the locking ball 44, the locking ball 44 may be configured by providing a cavity 45 and a spring 42 on the left side of a ring-shaped collar 431 that supports the locking ball 44 from the left and right sides. . . . Instead, a roller or a columnar locking member having a curved tip may be used.

When using these different types of locking members, the ball hole 13 provided at the rear end of the band piece 1...
It goes without saying that the shape of the ring-shaped groove provided on the outer periphery of the female portion 3 of the supply pipe should also be selected accordingly.

As is clear from the above description, the device of the present invention provides the following various benefits not found in conventional devices for connecting a dental band piece and a supply tube.

(1) Smooth free rotation of the band piece and supply pipe: Unlike conventional coupling devices that allow free rotation, which can be easily disconnected by applying external force, the band piece and supply pipe have a locking function. Since it has both an attachment/detachment mechanism and a free rotation holding mechanism, and is configured separately from each other, the tightening allowance of the O-ring inserted in the connection part is the minimum required to make each yarn path in the connection part airtight. Therefore, smooth free rotation, which is not possible with conventional devices of this type, is possible, making treatment operations more convenient for dentists.

In addition, in general, in a free rotation mechanism of a coupling device using a male and female part, smooth free rotation cannot be maintained unless the female part to be grasped by the surgeon is on the band piece side, but in the present invention, on the contrary, the male part Even if it is placed on the band piece side, the band piece side is still equipped with an outer cylinder that is fitted into the female part on the supply side, so this outer cylinder is grasped by the surgeon and the band piece is supplied. Free rotation relative to the tube is guaranteed, and
A corresponding number of passages for the supply medium necessary for dental treatment must be provided on the supply side, but in this type of band piece, where these supply media are often mixed at the joint, By making the male part on the band piece side, the number of passages on the band piece side can be reduced accordingly, and this is extremely advantageous in terms of drilling performance in the male part where the outer diameter is limited. will be added.

(2) Enabling attachment and detachment with one-touch operation The band piece and supply pipe can be completely connected by simply sliding the sleeve and inserting the male part at the rear end of the band piece into the female part of the supply pipe.
Moreover, the band piece and the supply pipe can be completely separated by simply sliding the sleeve and pulling out the female part at the rear end of the band piece from the male part of the supply pipe.

Therefore, it is easy to perform necessary maintenance of the band piece such as lubrication and cleaning, and when selecting a band piece for high-speed cutting or low-speed cutting as required during treatment, or when selecting the size of the band piece head depending on the patient, the band piece Conventionally, several supply pipes for connecting band pieces were required depending on the application in dental treatment where band pieces had to be replaced, but this can contribute to reducing the cost of treatment equipment.

(3) Preventing unnecessary separation during use: In conventional coupling devices that allow free rotation, if the O-ring inserted in the joint surface of the coupling part wears out, it may cause damage between the band piece and the supply pipe. However, with the device of the present invention, once the band piece and the supply pipe are connected, they will remain connected unless the sleeve is slid. (lock function), so there is no risk of it being unnecessarily removed when in use.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the device of the present invention showing the state before the band piece body and the supply pipe are connected, and Fig. 2 shows the state in which the sleeve is slid and the band piece main body is removed from the supply pipe. 1 is a longitudinal cross-sectional view of an embodiment of the device of the present invention shown in FIG. Brief explanation of the drawings 1... Dental band piece, 2... Supply tube, 3... Female part, 5...
... Male part, 4 ... Sleeve, 11 ...
... Band piece outer cylinder, 13 ... Ball hole, 2
1...Ball receiving groove, 22...Ring-shaped exhaust groove, 23...Ring-shaped water injection air mixing groove,
42... Spring, 44... Locking ball, 45... Cavity, 101... Spray supply pipe, 104, 212, 213...・Air supply pipe,
201, 102, 103... O-ring groove,
210...Water injection pipe, 301.302,303.
...O-ring, 431.432...Color ring.

Claims (1)

[Scope of utility model registration request] A connecting device that connects the rear end of the handpiece body 1 and the tip of the supply pipe 2, and is a supply path 101, 104 for a plurality of fluids and other substances necessary for dental treatment of the handpiece.
・A male portion 5 extending from the rear end of the handpiece main body 1 and a plurality of passages 210, 212, 213, etc. for substances necessary for dental treatment of the handpiece, such as fluids, etc.
. . , a female connecting cylinder 3 that projects from the tip of the supply pipe 2 in the axial direction and rotatably fits onto the male part 5 via O-rings 302 and 303, and A handpiece outer cylinder 1 is provided with a plurality of ball holes 13 and is rotatably fitted into the female sleeve 3 via an O-ring 301.
1, and a sleeve 4 that is slidably and loosely fitted onto this outer cylinder 11.
and the ball hole 13 and the female joint tube 3.
A plurality of circumferential locking balls 44 received in a ring-shaped ball receiving groove 21 provided on the outer periphery of the sleeve 4 and inserted between the sleeve 4 and the female sleeve 3.・A compression spring 42 that elastically presses the ball 44 into the ball receiving groove 21 to prevent it from coming out when the sleeve 4 is stopped, and a direction in which the spring 42 is further compressed. When the sleeve 4 is slid, the ball 44
. . . is moved in the inner circumferential direction of the sleeve 4 and removed from the ball receiving groove 21 to remove the ball 44.
A dental handpiece and a supply pipe comprising a circumferential cavity 45 provided in the sleeve 4 so as to release the engagement with the outer cylinder 11 and the ball receiving groove 21. coupling device.