JPS6132667Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention injects compressed air from an air cylinder attached to the rear end of the handshake part of the handpiece to create an air turbine built into the head part or the handshake part. Together with the air motor, the rotary shaft built into the head part is rotated to cut the workpiece with the cutting tool fixed at the tip of the rotary shaft, and the water in the water tank attached to the rear of the handshake part is compressed. The present invention relates to a hoseless handpiece that cools a cutting tool and a cutting part of a workpiece by injecting air from an injection port installed near a head part.

(Conventional configuration and its problems) Fig. 1 shows the configuration of a conventional hoseless handpiece.
4 is a rotating shaft rotatably attached to the head portion 3 via a bearing 5, and a chuck (not shown) installed inside the rotating shaft 4 is provided at the tip of the rotating shaft 4. Cutting tool (not shown)
can be installed. Reference numeral 6 indicates a plurality of turbine blades protruding in the radial direction on the outer circumferential wall surface of the intermediate portion of the rotating shaft 4; reference numeral 7 indicates an injection port 8 installed at a position facing the turbine blade 6; and an insertion port installed at the rear end surface of the handshake portion 2. 10 is a water tank protruding from the outer peripheral wall of the rear end of the handshake part 2; 11 is a water-tight water inlet provided at the bottom of the tank 10; Refill water in 10. 12 has one end inserted into the water tank 10,
The other end is the injection port 13 installed in the neck of the head part 3
14 is a valve that integrates the air supply valve provided on the air supply pipe 7 and the water supply valve provided on the water supply pipe 12; 15 is between the air supply valve of the valve 14 and the injection port 13; This fumarole pipe 15 is installed so as to cover the outer periphery of the water pipe 12. Reference numeral 16 denotes a cylinder filled with compressed air, and this cylinder 16 is attached to the rear end of the handshake part 2 with its tip inserted into the insertion port 9.

In the conventional example configured in this way, the valve 14
Open the cylinder 16 and remove the air pipe 7 and fumarole pipe 1.
When compressed air is supplied to the turbine blade 5, the compressed air injected from the injection port 8 toward the turbine blade 6 rotates the rotary shaft 4, and at the same time rotates from around the end of the water pipe 12 of the injection port 13. Compressed air injected toward the tip of the cutting tool attached to the shaft 4 causes the pressure at the end of the water pipe 12 to drop below atmospheric pressure, causing water in the water tank 10 to flow through the water pipe 12 to the injection port 13. The liquid is sucked out, atomized by the injection port 13, and sprayed onto the tip of the cutting tool. By the way, since the water tank 10 is provided protrudingly from the lower part of the rear end of the handshake part 2, when cutting the teeth of the lower jaw, no rotational force is generated in the circumferential direction of the handpiece 1, so that the cutting work can be easily performed. Furthermore, since the tip of the water pipe 12 is placed in the water in the water tank 10, the supply of water to the water pipe 12 never stops. However, when cutting teeth in the upper jaw, etc., if the hand piece 1 is used in an upright position, horizontal position, or upside down, the weight of the water tank 10 and the water in the water tank 10 may cause the hand piece 1 to A rotational force is generated in the circumferential direction, which makes cutting work difficult, and the tip of the water pipe 12 comes out of the water in the water tank 10, so there is no trace of water being supplied to the water pipe 12. It was hot.

(Purpose of the invention) The purpose of the invention is to ensure that the water tank attached to the rear outer peripheral wall of the handgrip part of the handpiece is always located below the handpiece, regardless of the state of use of the handpiece. .

(Structure of the invention) In the invention, a mounting shaft for attaching an air cylinder and a water tank is rotatably attached to the rear end of the handshake part of the handpiece.

(Description of Embodiment) FIG. 2 shows the configuration of an embodiment of the present invention, in which the same reference numerals as those in FIG. An air pipe 19 that communicates the ventilation port 18 on the rear end plane with the injection port 8;
21 is a water pipe that communicates the water inlet 20 on the inner circumferential wall surface of the rear end of the handshake part 2 with the injection port 13, and 21 is an integral part of the air valve provided on the air pipe 17 and the water valve provided on the water pipe 19. 22 is valve 21
The fumarole pipe 22 is installed between the air supply valve and the injection port 13, and the fumarole pipe 22 is installed so as to cover the outer periphery of the water supply pipe 19. 23 is a mounting shaft rotatably attached to the rear end of the handshake part 2 in the circumferential direction; 24 is a ventilation hole 25 provided on the tip surface at a position facing the ventilation hole 18; and 24, a ventilation hole 25 provided on the rear end surface. An air supply pipe communicates with the insertion port 26 to which the tip of the air cylinder 16 is inserted, 27 is a water tank protruding from the outer peripheral wall of the mounting shaft 23, and 28 is a watertight structure provided at the bottom of the water tank 27. Water is replenished into the water tank 27 from the water supply port 28.
Reference numeral 29 denotes a water supply pipe that communicates the water tank 27 with an annular water passage groove 30 that is recessed in the circumferential direction at a position facing the water passage port 20 on the outer circumferential wall surface of the distal end portion of the mounting shaft 23 .

In this embodiment configured in this way, the valve 2
1, the compressed air in the cylinder 16 flows into the air pipe 2.
4. When the air is supplied to the air supply pipe 17 and the fumarole pipe 22 through the vents 25 and 18, the compressed air injected from the injection port 8 toward the turbine blade 6 causes
At the same time as the rotating shaft 4 rotates, the pressure at the end of the water pipe 22 of the injection port 13 decreases below atmospheric pressure, and the water in the water tank 27 flows through the water pipe 29, the water passage groove 30, the water passage port 20, and the water supply pipe 22. The water is sucked out through the water pipe 22 to the nozzle 13, atomized at the nozzle 13, and sprayed onto the tip of the cutting tool. By the way, the mounting shaft 23
The water tank 27 is automatically rotated by the weight of the water tank 27 and the water in the water tank 27, so that the water tank 27 is always located below the hand piece 1 regardless of the usage state of the hand piece 1. become.

(Effects of the invention) As explained above, according to the invention, the water tank is always located below the handpiece regardless of the usage state of the handpiece, so that a rotational force is applied to the handpiece in the circumferential direction. This eliminates the occurrence of water, making cutting work easier, and since the tip of the water pipe is always in the water in the water tank, there is an advantage that there is no trace of water being supplied to the water pipe.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional hoseless handpiece, and FIG. 2 is a sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Handpiece, 2... Handshake part, 3... Head part, 4... Rotating shaft, 7, 17, 24... Air pipe, 10, 27... Water tank, 12, 19, 29
... Water pipe, 13 ... Injection port, 14, 21 ... Valve, 15, 22 ... Fumarole pipe, 16 ... Cylinder,
23...Mounting shaft.

Claims (1)

[Scope of utility model registration request] Compressed air is injected from an air cylinder attached to the rear of the handshake part through an air supply pipe to an air turbine in the head part or an air motor in the handshake part to rotate the rotary shaft of the head part. At the same time as the attached cutting tool cuts the object to be cut, water is supplied to the cutting tool and the object to be cut via a water pipe from a water tank attached to the rear of the handshake part. In the hoseless handpiece that cools the cutting object,
The air cylinder is removably mounted, the water tank is provided protruding from the outer periphery, an air supply means communicates the air cylinder and the air supply pipe of the handshake part, and an air supply means for connecting the water tank and the handshake part. 1. A hoseless handpiece, characterized in that a mounting shaft having a water supply means communicating with a water pipe is attached to the rear end of the handshake portion so as to be rotatable in the circumferential direction.