JPS6027299B2 - Fluid pressure hose connection device in dental handpiece - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a handpiece of the type in which a fluid pressure hose, such as water or tip air, is provided along the outside of a handpiece body sheath and a motor case connected thereto.

In conventional handpieces, a single hose connects the fluid supply tube provided at the proximal end of the motor case to the injection tube clamped and supported near the head of the handpiece body sheath. However, in actual use of the handpiece, the sheath side of the handpiece body undergoes rotational motion relative to the motor case, which can cause the hose to twist or become tangled, which can cause the joint to become loose. It's unlikely that it will come off.

To compensate for this drawback, there are hoses with extra length (i.e., slack), but this creates another difficulty in that it interferes with handpiece operation. An object of the present invention is to provide a handpiece in which the above-mentioned drawbacks can be eliminated by separating the fluid pressure hose between the sheath side of the handpiece body and the side of the motor case and using a relay part that is not affected by mutual rotation. It is in.

To explain the embodiments in the drawings below, the one shown in FIG. 1 is a dental hand in which a handpiece body 1 and a motor case 2 are hermetically connected to each other by a locking device 14 so that they can be separated from each other and can freely rotate relative to each other. Peace.

Now, as shown in FIG. 2, the connection inner cylinder 3 is fixed to the outer periphery of the connection part on the handpiece body sheath 1 side with a set screw 3a, and the connection outer cylinder 3 is fixed to the outer periphery of the connection part on the motor case 2 side. It is fixed with screws 4a.

Two annular grooves 5, 5 are provided in the rotating direction of at least one joint surface of these two cylinders 3, 4 (in the connecting inner cylinder 3 in FIG. 2, in the connecting inner cylinder 3 in FIG. )
, annular spaces 6, 6 are formed at the joint surfaces of both cylinders 3, 4. This annular space 6 is a fluid relay space, and seal rings 19 are provided on the joint surfaces on both sides of the annular space 6 to prevent fluid leakage to the outside. Further, two forward fluid pressure relay pipes 7 are provided in the internal axial direction of the connecting inner cylinder 3, with their tips protruding forward and outside and their proximal ends passing through the annular space 6, and the other inside the connecting outer cylinder 4. Two backward fluid pressure relay pipes 8 whose distal ends protrude outward in the radial direction, whose protruding ends are bent rearward, and whose proximal ends pass through the annular space 6.
will be established. Then, the forward fluid pressure relay pipe 7 and two injection pipes 10 attached to the vicinity of the head of the handpiece body sheath 1 via the collar fittings 9 are connected by hoses 11, and the backward fluid pressure relay pipe 8 and two fluid supply pipes 12 provided at the base end of the motor case 2 are connected by hoses 13, respectively. Next, to explain its operation, the practitioner grasps the handpiece in the state shown in Figures 1 and 3, starts the motor to drive the tool, and supplies water or tip air as necessary. Treatment is carried out through the injection pipe 10 via the hose 13, the backward relay pipe 8, the annular space 6, the forward relay pipe 7, and the hose 11 from the Noai tube 12. At this time, the handpiece body sheath 1 is connected to the motor case. Since it is rotatable with respect to 2, it can be rotated at any angle.

To explain this in detail, the handpiece main body sheath 1 and the motor case 2 are connected in a sealed manner so as to be relatively rotatable by the locking device 14, so that they will not come apart unless the knob 15 is operated, and the connection inner cylinder 3 and the connection will be disconnected. It is designed to be able to rotate by matching with the cylinder 4. That is, the two cylinders 3 and 4 can rotate relative to each other while forming an annular space 6 at the joint surface, and the annular space 6 is used as a relay space to provide separate fluid pressure relay pipes 7 and 8 to the front and rear. From, both cylinders 3 and 4
As the relay pipes 7 and 8 rotate, the relay pipes 7 and 8 rotate independently of each other. As a result, the hoses connected to these are divided into the handpiece body sheath 1 side (front) and the motor case 2 side (rear), and are not affected by the movement of the other. Therefore, unlike conventional single-hose type handpieces, there is no need to worry about the hose getting dirty or tangled during use, and no excessive force is applied to the hose connection.

Of course, there is no need to make the hose look fancy. The hose is divided into two parts, making it easier to disassemble and clean. From the above, it will be easily understood that the present invention is truly advantageous in achieving the intended purpose.

It should be noted that the above description is based solely on preferred embodiments of the present invention, and it goes without saying that many design changes can be made without changing the gist of the invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a handpiece equipped with the device of the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is an enlarged longitudinal sectional side view of the main part. 1...Handpiece body sheath, 2...Motor case, 3...
・Connection inner cylinder, 4... Connection outer cylinder, 5... Annular groove, 6.
... Annular space, 7... Forward fluid pressure relay pipe, 8
... Rearward fluid pressure relay pipe, 9 ... Clamping tool, 1
0... Injection pipe, 11... Hose, 12... Fluid supply pipe, 13... Hose, 14... Locking device, 15...
... Knopu, 16... Spring, 17... Sondome anchor, 17a
...The hook part, 18... Annular locking groove, 19... Seal ring. military poetry stomach pair

Claims (1)

[Scope of Claims] 1. In a dental handpiece in which a handpiece body sheath 1 and a motor case 2 are hermetically connected to each other by a locking device 14 so as to be removable and relatively rotatable, the handpiece body sheath 1 An inner connecting cylinder 3 is fixed to the outer periphery of the connecting part on the side of the motor case 2, and an outer connecting cylinder 4 is fixed to the outer periphery of the connecting part on the other side of the motor case 2. An annular space 6 is installed around the joint surface of both cylinders 3 and 4.
A forward fluid pressure relay pipe 7 is provided in the inner axial direction of the connecting inner cylinder 3, the tip of which protrudes forward and outward, and the proximal end communicates with the annular space 6. A backward fluid pressure relay pipe 8 is provided which is bent outward to the rear and whose base end communicates with the annular space 6, and is attached to the forward fluid pressure relay pipe 7 and the vicinity of the head of the handpiece body sheath 1 via a clamp 9. Hose 11 between injection pipes 10
A fluid pressure hose connection device for a dental handpiece, characterized in that the backward fluid pressure relay pipe 8 and the fluid supply pipe 12 provided at the base end of the motor case 2 are connected by a hose 13. 2. Fluid in the dental handpiece according to claim 1, wherein annular grooves 5, 5 are provided around the joint surfaces of the connecting inner cylinder 3 and the connecting outer cylinder 4 at positions corresponding to the rotational direction to form an annular space 6. Pressure hose connection device. 3. A fluid pressure hose connection device in a dental handpiece according to claim 1 or 2, wherein seal rings 19 are provided on both joint surfaces of the annular space 6. 4 The locking device 14 is provided with a knob 15 supported by a spring 16 from the outside to the inside of the motor case 2, and the hook portion 17a of the locking hook 17 integrally fixed in the axial direction of the lower end is connected to the handpiece body sheath. A fluid pressure hose connection device for a dental handpiece according to any one of claims 1 to 3, which is configured to be locked in an annular locking groove 18 provided on the inner wall surface of the dental handpiece. .