JPS59889Y2 - Dental handpiece air turbine oil injection tool - Google Patents

Description

[Detailed description of the invention] This invention is based on the air turbine of a dental handpiece used to lubricate the bearing of an air turbine that rotates at high speed a dental treatment tool such as a drill for scraping or drilling teeth and gums. Regarding oil injection tools.

In general, this type of air turbine is one in which both ends of a rotating shaft are supported by bearings within a casing formed at the tip of the handpiece, and blades fixed to the rotating shaft are rotated by receiving compressed air. is known, and because the rotating shaft rotates at high speed, it is necessary to lubricate the bearing.

Conventionally, this lubrication was performed by removing the cap from the casing, which took time and effort, staining hands and clothes, and risking parts being lost.

Therefore, the present applicant has already developed a so-called extrusion-type oil injection tool in which oil stored in an oil chamber provided in the main body is extruded from an injection needle at the tip using an extrusion rod to lubricate the bearing. (Refer to Utility Model Application No. 51-013248 and Utility Model Application No. 51-013249).

By the way, this oil filler naturally requires replenishment of oil, but the part that is lubricated by this oil filler, that is, the bearing part of the air turbine, is originally extremely small as is well known. Accordingly, the oil-based tools themselves have naturally become smaller, and therefore, the work of refilling the specified oil into such miniaturized oil chambers, that is, the work of filling them, is quite difficult and complicated. This was discovered later.

One of the reasons for this is that the oil used is usually semi-solid.

This invention was made in view of the above circumstances, and it is an object of the present invention to provide an oil injector for an air turbine for a dental band piece, which greatly simplifies the oil replenishment operation and eliminates the above-mentioned drawbacks.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

In FIG. 1, a main body 3 having a storage chamber 2 for storing a cartridge 1 has an oil passage 5 passing through a discharge port 4 for oil A in the cartridge 1 and guiding the oil A in the cartridge 1. An oil guide needle 6 is provided protruding into the storage chamber 2, and an injection needle 8 having a narrow passage 7 communicating with the oil passage 5 of the oil guide needle 6 is provided protruding from the opposite side of the oil guide needle 6. This injection needle 8
An injection hole 9 is bored through the narrow passage 7 in the middle part of the tube.

The tip of the injection needle 8 is formed solid, and the injection hole 9 of the narrow passage 7
It is connected to a dead end.

The base end of the main body 3 is opened, and the cartridge 1 is inserted into the storage chamber 2 from there.

If the cartridge is pushed in strongly during this insertion, the sealing material of the discharge port 4 of the cartridge 1 will be pierced by the tip of the oil guide needle 6 (this part is a blade), so the oil guide needle 6 can enter into the cartridge 1.

This cartridge 1 has a piston 10 for pushing out oil A.
A seal packing 11 for preventing oil A from leaking is fitted into this piston 10.

The cartridge 1 is replaceable with a compound cartridge, and is prefilled with oil at a factory or the like.

A screw 12 is cut on the outer peripheral surface of the main body 3, and this screw 12
A screw 14 cut into the inner circumferential surface of the press cover 13 is screwed into the press cover 13.

The base end of a pressing rod 15 is fixed to the inner bottom surface of the pressing lid 13, and the tip of the pressing rod 15 faces the piston 10 of the cartridge 1.

By screwing this press cover 13 into the main body 3, the tip of the press rod 15 is used to press the piston 10 of the cartridge 1.
The oil A is pushed out from the injection hole 9 of the injection needle 8 by pressing .

In addition, the outer peripheral surfaces of the main body 3 and the press lid 13 are provided with recessed holes 3a that serve as marks.

13a are provided respectively, and convenience is made so that when the press cover 13 is rotated, for example, once in accordance with the mark, the amount of oil required for the bearing is reached.

On the other hand, the air turbine 16 is supported by a rotary shaft 19 having blades 18 fixed in a casing 17 formed at the tip of a band piece (not shown), with one end protruding from the bottom of the casing 17 .

Bearings 21 and 22 are attached to the bottom of the casing 17 and the cap 20 fitted to the casing 17, respectively, and both ends of the rotating shaft 19 are pivotally supported by these bearings 21 and 22.

A mounting hole 23 is bored through the rotating shaft 19 along the solid axis, and a dental treatment tool such as a drill (not shown) can be mounted in the mounting hole 23.

Further, a communication hole 24 communicating with the mounting hole 23 is bored in the radial direction of the rotating shaft 19, and an injection groove 25 is formed in the blade 18 so as to communicate with the communication hole 24.

The injection grooves 25 are formed at several locations along the axial direction of the rotating shaft 19 in a portion of the blade 18 that is fixed to the rotating shaft 19 .

Next, the lubrication method and operation of the lubrication tool according to this invention will be explained.

First, the injection needle 8 is inserted into the mounting hole 23 of the rotating shaft 19, the injection hole 9 is positioned in the communication hole 24 part, and the press lid 13 is placed in the first
If you rotate it so that it moves to the left in the figure,
The piston 10 is moved to the left in FIG. 1 by the pressing rod 15.

When the piston 10 moves, the oil A in the cartridge 1 is pushed out through the oil passage 5 and narrow passage 7 through the injection hole 9.

The oil A pushed out from the injection hole 9 flows from the mounting hole 23 into the injection groove 2.
5, the bearings 21 and 22 are lubricated with oil.

Note that when the oil A in the cartridge 1 runs out, it is sufficient to replace it with another cartridge.

This replacement is performed by removing the press lid 13 from the main body 3 and inserting another cartridge through the opening of the main body 3.

As described in detail above, in the oil injection tool according to this invention, the cartridge containing the oil pushed out by the piston is housed in the main body, and the pressure rod of the pressure lid screwed into the main body is used to press the cartridge. Since the oil is injected into the bearing of the air turbine by pressing the piston, it is extremely easy to replenish the oil by simply replacing the cartridge, which has the excellent effect of eliminating the complication of the conventional method. be.

In addition, especially according to the present invention, the relationship between the number of rotations of the pressing lid and the amount of oil discharged can be set appropriately in advance, so the oil filling operator can perform the work very easily based on the landmarks. Moreover, it has the effect of being able to reliably lubricate just the right amount of oil.

This effect is extremely important when considering the fact that the lubrication operator is often a doctor, nurse, or other person who has other complicated, specialized work.

In addition, by providing the knob 1a, it is possible to attach and detach the car 1 helicopter 1 very easily using the knob 1a, and since the knob 1a is provided, the hands are not dirty with oil etc. You can prevent this from happening.

What is more important is that this knob portion 1a can be used to effectively utilize the internal space of the cylindrical press lid 13 to hold the press lid 13.
Since it is configured to be housed inside, it has excellent effects such as being able to be configured compactly and having a good appearance without being exposed to the outside.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention, and FIG. 2 is a sectional view showing the state of use. 1...Car 1~Rituji, 2...Storage room, 3...Main body, 4...Exhaust port, 5...
...Oil passage, 6...Oil guide needle, 7...
Narrow path, 8... Injection needle, 9... Injection hole,
10... Piston, 12... Screw, 1
3...Press lid, 14...Screw, 15.
...Press rod, 16...Air turbine,
19...rotating shaft, 23. ...,. Mounting hole, 24...Communication hole.

Claims (1)

[Scope of utility model registration request] A mounting hole is drilled through the rotating shaft along the solid axis, and a communicating hole is drilled in the radial direction of the rotating shaft, and when oil is injected through the mounting hole, the bearing is lubricated through the communicating hole. This oil injection tool for the air turbine of a dental handpiece is configured as follows, and this oil injection tool includes a cartridge 1 containing oil A pushed out by a piston 10, and a storage for storing this cartridge. A main body 3 having a chamber 2, a pressing lid 13 having a pressing rod 15 that is screwed onto the main body and presses the piston, and a pressing lid 13 that projects from the main body into the storage chamber and passes through the oil discharge port 4 of the cartridge. an oil guide needle 6 having an oil passage 5 for guiding the oil in the cartridge, and an injection needle having a narrow passage 7 communicating with the oil passage of the oil guide needle and being inserted into the mounting hole of the rotating shaft. 8 and an injection hole drilled through a narrow passage in the middle part of the injection needle, and on the outer peripheral surfaces of the main body 3 and the press lid 13,
Markers 3a and 13a are respectively provided for determining the amount of oil pushed out by rotating the pressing lid 13 based on the number of rotations of the pressing lid 13. On the other hand, the cartridge 1 is stored in the storage chamber 2 of the main body 3. In this state, the knob portion 1a, which is the end opposite to the discharge port 4, has a length such that it protrudes beyond the base end 3b of the main body 3, which is on the side of the press lid 13, and the protrusion is strong. An oil injector for an air turbine of a dental handpiece, characterized in that a knob portion 1a portion thereof is sized to fit within a press lid 13.