JPH0327621Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention allows the air supply pipe and water supply pipe of the drive source case to be connected even if the grip case attached to the tip of the drive source case rotates in the circumferential direction. This invention relates to a handpiece in which an air supply pipe and a water supply pipe of a gripping case are always in communication.

(Conventional configuration and its problems) Figures 1 and 2 show the configuration of a conventional handpiece, where 1 is an electric motor (not shown).
Motor case 2 has a built-in motor case 1.
Cylindrical junctions 3 and 4 protrude from the tip of the motor case 1 so as to cover the drive shaft (not shown) of the electric motor protruding from the tip of the cylindrical junction 2, respectively. A communication groove (see Fig. 2) recessed in the direction, 5, has its tip connected to the communication groove 3, and its rear end connected to a compressed air supply source (not shown) via an air supply pipe 7 of a hose 6. This air supply pipe 5 is embedded in the motor case 1. 8 has a communicating groove 4 at the tip.
A water supply pipe whose rear end is connected to a pressurized water supply source (not shown) via a water supply pipe (not shown) of a hose 6, and this water supply pipe 8 is connected to the motor case 1.
is buried inside. Reference numeral 9 denotes three O-rings for preventing leakage which are mounted on the outer circumferential wall of the junction 2, and these O-rings 9 are located before and after the communication grooves 3 and 4, respectively. 10 is a cutting tool 1
A grip case 12 has a built-in chuck (not shown) for stopping the handle of 1 and a rotating shaft (not shown) connected to this chuck, and covers the rear end of the rotating shaft. A cylindrical juncture sleeve is provided inside the rear end of the gripping case 10. When the juncture 2 is inserted into the juncture sleeve 12, the gripping case 10
is rotatably attached to the tip of the motor case 1. Reference numeral 13 denotes a piping groove recessed on the outer circumferential wall surface of the junction sleeve 12 in the direction of its center line from the tip to the rear end, and 14 and 15 denote communication grooves 3 and 4 from the inner circumferential wall surface of the junction sleeve 12 to the piping groove 13. The communication holes 16 are respectively drilled at positions facing the grip case 10 with the injection ports protruding from the tip of the grip case 10 facing the cutting tool 11.
The air supply pipe 17 installed inside the grip case 10 is connected to the water supply pipe 18 installed inside the grip case 10 with the injection port protruding from the tip of the grip case 10 facing the cutting tool 11. is a connecting body in which two pipes 19 and 20 are bored from the bottom to the side, and the openings in the bottom of the pipes 19 and 20 of this connecting body 18 are provided at positions facing the communication holes 14 and 15, respectively. Further, the rear ends of the air supply pipe 16 and the water supply pipe 17, which are fitted into the respective openings, are welded to the side openings of the pipes 19 and 20, respectively. 2
Reference numeral 1 denotes a packing interposed between the bottom of the piping groove 13 and the bottom surface of the connecting body 18, and this packing 21 includes:
Holes are provided at positions facing the communicating holes 14 and 15, respectively. 22 is a set screw that prevents the juncture sleeve 12 inserted into the grip case 10 from falling off.

In the conventional example configured in this way, the junction 2 is fixed to the tip of the motor case 1 in advance, and the connection body 18 is fitted to the rear end of the piping groove 13 via the packing 21, and the supply is completed. The junction sleeve 12 with the trachea 16 and water supply pipe 17 arranged in the piping groove 13 is press-fitted into the gripping case 10, and the set screw 22 is screwed into the rear end of the gripping case 10 to complete the juncture. - Fix the sleeve 12 to the grip case 10. Next, insert the junction 2 into the junction sleeve 12,
When the grip case 10 is attached to the tip of the motor case 1, the communication holes 14 and 15 are connected to the communication groove 3.
and 4, the air supply pipe 5 is connected to the communication groove 3, the communication hole 14, the hole of the packing 21, and the pipe 1 of the connecting body 18.
It communicates with the air supply pipe 16 via the water supply pipe 8.
communicates with the water supply pipe 17 via the communication groove 4, the communication hole 15, the hole in the packing 21, and the pipe 20 of the connecting body 18. Furthermore, even if the grip case 10 rotates relative to the motor case 1, the communication holes 14 and 15
move along the communication grooves 3 and 4, respectively, so that the air supply pipe 5 and the water supply pipe 8 are always in communication with the air supply pipe 16 and the water supply pipe 17, respectively. By the way, in order to connect the air supply pipe 16 to the communication hole 14 and the water supply pipe 17 to the communication hole 15, the connecting body 18 in which the pipes 19 and 20 are drilled and the packing 21 in which the hole is drilled are required. In addition, it is necessary to fit the packing 21 and the connecting body 18 into the pipe groove 13, and to press the junction sleeve 12 into the gripping case 10 while pressing the connecting body 18. Therefore, the number of assembly steps is large, and
The drawback was that it was difficult to assemble. Furthermore, since the gasket 21 is used, it is necessary to replace the gasket 21, which has the disadvantage of complicating maintenance work.

(Purpose of the invention) The purpose of the invention is to reduce the number of parts, thereby simplifying assembly man-hours and maintenance work, and providing a handpiece with low manufacturing and maintenance costs.

(Structure of the invention) Fig. 3 shows the structure of an embodiment of the invention, in which the same reference numerals as those in Figs. 1 and 2 indicate the same parts, and 23 and 24 are communication holes drilled between the communication holes 14 and 15 and the piping groove 13, respectively.

In this embodiment configured in this way, the junction 2 is fixed to the tip of the motor case 1 in advance, and the rear end of the air supply pipe 16 is connected to the communication hole 23.
Then, insert the rear ends of the water supply pipes 17 into the communication holes 24, and connect the air supply pipes 16 and water supply pipes 17 to the piping groove 1.
3, the molten metal is poured into the piping groove 13, the air supply pipe 16 and the water supply pipe 17 are buried in the piping groove 13, and the gap between the air supply pipe 16 and the communication hole 23 and the gap between the water supply pipe 17 and the communication hole are buried. 24 and the respective gaps are sealed. Next, when the junction 2 is inserted into the junction sleeve 12 and the grip case 10 is attached to the tip of the motor case 1, the communication holes 14 and 15 face the communication grooves 3 and 4, respectively, and the air supply pipe 5 The water supply pipe 8 communicates with the water supply pipe 17 through the communication groove 4, the communication hole 15, and the communication hole 24. Furthermore, even if the gripping case 10 rotates relative to the motor case 1, the communication holes 14 and 15 move along the communication grooves 3 and 4, respectively, so that the air supply pipe 5 is moved along the air supply pipe 16.
Furthermore, the water supply pipes 8 and 17 are always connected to each other.

(Effect of the invention) As explained above, according to the invention, the air supply pipe and water supply pipe of the grip case are simply inserted into the communication hole and buried in the piping groove. There is no need for any connecting parts between the pipes and the communication holes, reducing the number of parts, and since the air supply pipe and water supply pipe of the gripping case are buried in the piping groove, the junction sleeve can be simply gripped. Since it only needs to be press-fitted into the case, there are advantages in that the number of assembly steps is reduced and assembly is also simple. Furthermore, since the gaps between the air and water supply pipes and the communication holes in the grip case are sealed with molten metal, there is no need to replace the gaskets, which simplifies maintenance work. be.

[Brief explanation of the drawing]

Figure 1 is an overall view of the handpiece, Figure 2a is a partial cross-sectional view of the connection point between the motor case and gripping case in a conventional handpiece, and Figure 2b is a junction and a junction sleeve in a conventional handpiece. Fig. 3a is a partial sectional view of the connection point between the motor case and the gripping case according to an embodiment of the present invention, and Fig. 3b is a diagram of the junction and junction sleeve according to an embodiment of the present invention. It is a connection state diagram with. 1...Motor case, 2...Janction,
3, 4...Communication groove, 5,16...Air supply pipe, 8,1
7... Water supply pipe, 10... Gripping case, 12... Junction sleeve, 13... Piping groove, 1
4, 15... Communication hole, 23, 24... Communication hole.

Claims (1)

[Scope of utility model registration request] Even if the gripping case attached to the tip of the drive source case rotates in the circumferential direction, the juncture sleeve installed at the rear end of the gripping case does not protrude from the inner peripheral wall surface or the tip of the drive source case. A communication hole bored in the outer peripheral wall of the juncture moves along a communication groove recessed in the circumferential direction in the outer peripheral wall of the juncture or the inner peripheral wall of the junction sleeve, and the communication hole or the communication In the handpiece in which the air supply pipe and water supply pipe of the grip case connected to the groove are always in communication with the air supply pipe and water supply pipe of the drive source case connected to the communication groove or the communication hole, One end of the air supply pipe and the water supply pipe of the gripping case disposed in a recessed piping groove are inserted into the communication hole or a communication hole bored between the communication groove and the piping groove. and at least a periphery of the insertion portion thereof is embedded in the piping groove.