PNEUMATIC ROTARY ACTUATOR

Abstract

The invention concerns a pneumatic control rotary actuator that incorporates a control piston of a rack toothing engaging with a pinion to cause it to rotate together with an item holder device; the pinion has toothing made up of several parallel pins (23) spaced at an angle, positioned and held orderly between a base flange (21) and an item holder disk head (22); the base flange and the disk are each produced by compression moulding, die-casting, sinterisation and the like, using a low mechanical resistance material whereas said pins are made of some other material with high mechanical properties and hardness.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will however be illustrated more in detail in the continuation of this description made in reference to the enclosed indicative and not restrictive drawings, in which:

FIG. 1 shows a view in perspective of the assembled rotary actuator;

FIG. 2 shows a blow-up of its components;

FIGS. 3 and 4 show a blow-up from two different directions of the pinion components.

Claims

1. Pneumatically controlled rotary actuator comprising an actuator body forming a chamber and a housing with orthogonal planes and with the chamber tangent to the housing, where a pneumatic piston, subject to alternating movements is housed, where said housing also houses and supports a turning pinion bearing an item holder disk head, and where the piston has a toothed rack engaging with the pinion to make it turn together with the item holder disk head in response to the alternating movements of the piston, wherein said pinion has a toothing formed of parallel pins, at intervals at an angle, positioned and engaging and held in an orderly way between a base flange and said item holder disk head and wherein said flange and disk are made of a first poor material with low mechanical strength, and said pins are made of a second material with high mechanical properties and hardness.

2. Pneumatic rotary actuator according to claim 1, in which the base flange has an integral necks, designed to receive a first support bearing, and an axial through bore; in which the item holder disk head has a neck designed to receive a second support bearing, and an axial shank with one end housed in said axial bore of the base flange; and in which the opposed facing sides of the neck of the base flange and the neck of the item holder disk head each have orderly bores following a circumference designed to receive and hold the ends of said pin forming the toothing of the pinion.

3. Pneumatic rotary actuator according to claim 1, in which said base flange, said pins and said item holder disk head forming the pinion are coupled and fixed longitudinally.

4. Pneumatic rotary actuator according to claim 3, in which in said base flange, said pins and said item holder disk head are fixed longitudinally with a screw blocking the end of the axial shrank of the disk head in the central bore of the base flange.

5. A pneumatic rotary actuator according to claim 1, in which in said base flange, and said item holder disk head of the pinion are each made of a material such as zama (Zn+AL+Mg alloy) or another low mechanical resistance material, and produced using compression moulding, die-casting, sinterisation and the like, and said pins are steel or some other material with high mechanical properties and hardness.

6. A pneumatic rotary actuator according to claim 1, in which the disk head has an integral lateral wing acting as a guide for an end of stroke element, e bores provided directly during the moulding process and designed for attaching complementary elements.

7. A pneumatic rotary actuator according to claim 1, in which the pinion made up of the pins positioned and held between the base flange and item holder disk head is inserted as a whole with the support bearings in the housing of the actuator body so that said pins engage with the toothing of the pneumatic piston and said disk head protrudes from said body.

8. A pneumatic rotary actuator according to claim 1, in which the body of the actuator is either in one piece or made up of two elements which are complementary and assembled to form said chamber for the piston and said housing for the pinion.