FR2539067A1 - Pneumatic motor-cutter-grinder of very small size, with monobloc rotor - Google Patents

Abstract

The invention relates to motors, cutters, grinders with a monobloc rotor, comprising a clamp which makes it possible to clamp any type of tool, whose size is comparable with a pen. The clamping and unclamping do not necessitate any tools and can be achieved without effort. An antivibration system makes this a precision tool. This motor comprises a body 1, a stator 2, a rotor 3, an air feed system 4, 5 and a channelled exhaust 6, a clamp 7 and its actuating ring 8. Amongst the most advantageous applications of the invention, mention may be used of a cutter used in a dental or medical environment.

Description

 The present invention relates to a pneumatic motor whose design makes it a very powerful engine for its very small size.

 The present invention in fact that, mounted in a body barely larger than a pen, becomes a grinder high speed; moreover its internal design avoids vibrations at the level of the whole, vibrations harmful to the holding of the tools that are all the other high speed models.

 Another object of the present invention is that this engine in use of grinder-milling machine has a gripper system tightening the whole and is manoeuvrable without the intermediary of disassembly.

 This invention is presented with the recovery of exhaust air from the back of the machine, allowing it to be used in the dental or medical environment.

The description of the present invention is detailed below with reference to the accompanying drawings in which
FIG. 1 is a longitudinal sectional view of the pneumatic engine
Figure 2 shows the particular machining of the rotor of the invention.

 Figure 3 is a sectional view of the engine.

 Figure 4 shows the geometrical shape of the pallet, implementation element of the motor rotor.

 Figure 5 shows the anti-vibratory system of the rotor clamp output.

 The invention is hereinafter described using the markers employed in the drawing.

 Figure 1 shows the casing 1> the cylinder 2 a rotor 3 an air intake tube 4 a feed pipe 5, an exhaust pipe 6, a gripper 7 and an operating ring 8. Other elements are indicated either by numbers or by letters.

 According to the flashlight 1 the pneumatic motor A is formed of a cylinder 2 equipped with the rotor 3, pallets 11, a rear flange 18 equipped with a bearing 13 blocked by a nut 15 and a rotor nut 14. your back cheek 18 lets ltair compressed air feed through slot B.

A lease before 9 is sealed at the front of the engine and a bearing 19 supports the bending forces subjected to the rotor 3 by the tool mounted in the clamp 7. The clamping stop nut 30 receives in support the thrust cone lo, itself put in compression by the spring 33. The centering of the clamp is provided relative to the rotor by the recess D. The exhaust pipe 17 thus cartilises the entire engine and separates the intake of the exhaust .

 In most air motors the rotor is machined by the milling machine; for this purpose the rotor 3 is machined by electro-erosion, which allows to obtain a housing pallets 11 parallelepiped.

This form of machining has the dual purpose of having a better seal at the level of the cheek before 9 so a better performance flow power, then an increased longevity of the pallet given by its rectangular shape and thus allows a better guiding of the latter. in his dwelling. On the other hand, this machining in the form of a rectangle with respect to the conventional machining including a cutter clearance, allows to incorporate the gripper system inside the rotors which avoids the screwing of the clamp system on the tail of the rotor.

 The aim of having the clamp system incorporated in the rotor avoids the vibrations due to them eccentric in the screwing clamp holder on the rotor to ensure a better cencentricity. A grinder-milling version is shown in FIG. 1 with the motor assembly mounted in a body 1 comprising the loosening ring 8 of the gripper 7.This ring is trapped in translation by the retaining cap 32 which comprises the bearing 34 serving as anti-vibration, this bearing is mounted on an O-ring 35 with a hardness calculated to avoid vibrations and allows to leave a latitude of movement to avoid the third bearing still harmful rolling, while being rigid enough to absorb the effort applied to the tool during work.

Inside the loosening ring 8, a thread makes it possible to drive 2 half nuts 29 bearing on the body 1 see FIG. 6. These 2 half nuts 29 are thus biased in translation during a rotation of the ring 8 and come to bear on the movement ring 36 driving the axis 37 e-, hard coupled in the ring 36 and thus pulls the thrust cone 10, compresses the spring 33 and releases the tool.

 your combination of the pitch of the ring 8 and its two half-nuts 29 is such that the system runs on a turn 114 effortlessly.

 To lock the tool in the clamp simply turn the operating ring 8 in the opposite direction.

 The intake of compressed air is effected from the rear of the engine via the feed nozzle 4, the latter having two ducts, one for feeding, the other for recovering air. exhaust, an O-ring 21 isolates the intake of the exhaust.

 The body 1 has a shoulder E receiving the collar of the bearing 19 and serves as a centering of the motor, 1'entroutement 4 is screwed into the body 1 and thus ensures the sealing of the engine assembly.

A seal 22 removes exhaust air leakage to the outside thus avoiding polluting the outside of the body of the milling machine.

 This grinder-milling machine is coupled to a nozzle 26 comprising two nozzles, one for the supply, the other for the exhaust, a seal 24 and a nut 28 provide flexible motor connection, the keying is performed by a pin 27.

 This grinder-milling machine is connected to a pedal admitting the air which allows a very great flexibility of use and thus serves as a speed regulator.

Claims (5)

- 1 - Portable pneumatic motor and milling machine established with this engine, characterized in that the casing and its motor are of comparable dimensions to a pen and that the front portion is equipped with a clamp for receiving tools or equipment of grinding or milling. - 2 - Pneumatic motor, according to claim 1, in that the slots for receiving the rotor blades, are obtained electro-erosion or any other manufacturing means to obtain a parallelepiped shape and thus allowing pallets to have their rectangular shape. - 3 - Pneumatic motor and milling machine established with this engine according to claims 1 and 2 together, characterized in that the rotary shaft is in a single pie it forming the rotor and thus comprises the gripper support. - 4 - Pneumatic motor and milling machine established with this motor according to claims 1, 2 and 3 together, characterized in that the cuti is either a wrinkle or a mill mounted on any rod regardless of the diameter, the tool is integral with the rotor and can be mounted tightly in a clamp located inside and at the end of the rotor. - 5 - Pneumatic motor and milling machine established with this motor according to claims 1, 2, 3 and 4, characterized in that an actuating ring is integral with the tool to ensure the maneuvers clamping and loosening the tool without external help of wrenches or - 6 - Engine pneunatique and milleus-grinder established with this engine according to claim 5, characterized in that the actuating ring ensures quick clamping and manual release of the cutil, without effort. - 7 - Pneumatic motor and milling machine established with. this engine according to claims 1, 2, 3, 4, 5, characterized in that the rotary shaft has a third bearing mounted on a seal, serves as anti-vibration and absorbs the forces applied to the tool. - 8 - Pneumatic motor and milling machine established with this motor according to claims 1, 2 and 3 together, characterized in that itair and exhaust air are channeled to the rear of the machine to lower the level. sound and protect the machine from greasy exhaust air pollution.