Valve control device
Assignee4Mc
InventorNarciso Loris Molinaro
Life of this patent
Estimating the term…
Abstract
A device for actuating a valve by means of a rack meshing with an elliptical pinion connected with a sleeve so that one transmits a torque to the other. The connections between the pinion and the rack as well as the sleeve are separable, so that the angular reference positions of the pinion relative to both the rack and the sleeve can be adapted according to a predefined variation in the torque required for actuating the valve.
Claims15
A method for preparing and producing devices, each for actuating a member that is operable between two positions, by use on each of the devices of at least one actuator controlled by a power source, and a rack positioned in a meshing connection with a toothed rotating pinion having teeth which extend on a primitive perimeter or diameter and are situated at a plurality of different radii, wherein the rack extends generally transversely to the axis of rotation of the pinion, on a curve which is the involute of at least a part of the primitive perimeter or diameter of the pinion, the pinion connects with a sleeve so that one of the pinion or the sleeve transmits a torque to the other of the pinion or the sleeve, and the meshing connection is separable, said method for preparing and producing the device comprising:
- providing the member having a predefined variation in torque required for actuating the member;
- and
- selecting the following according to the predefined variation in torque:
- one of the actuators,
- one of the racks and one of the pinions, from a group of said devices where two successive racks and two successive pinions in the same group of devices have a size ratio between 1.20 and 1.80;
- and
- an angular reference position of the selected pinion relative to the selected rack and the corresponding sleeve;
- implementing and positioning the selected rack in the device according to the predefined variation in torque, wherein said selected rack is implemented and positioned in the device on the involute;
- and
- fixing the selected pinion in the device in its reference angular position relative to the selected rack and the corresponding sleeve, wherein when actuation of the selected actuator is demanded, the pinion actuates the member between said two positions,
- wherein the step of selecting one of the actuators comprises selecting said actuator having an axis and comprising:
- a cylinder internally grooved on a periphery and open axially at two opposite end sides,
- a piston movable in the cylinder, along said axis of said actuator,
- cleats which each have a peripheral projecting zone,
- two opposite and removable cylinder bottoms each axially closing a respective one of the two opposite open end sides of the cylinder and both having external casings configured to receive the cleats, the projecting zone of the cleats being engaged in the grooves of the cylinder, and
- a first removable fixing device and a second removable fixing device respectively engaged in the respective two opposite cylinder bottoms through said cleats, wherein removal of at least one of the two opposite cylinder bottoms allows access to the piston in the cylinder.
A group of actuating devices each actuating device actuating a member operable between two positions, wherein each actuating device of said group of actuating devices comprises:
- at least one actuator controlled by a power source;
- and
- a rack positioned in meshing connection with a toothed rotating pinion having teeth which extend on a primitive perimeter or diameter (Dp), and are situated at a plurality of different radii,
- wherein the rack extends generally transverse to the axis of rotation of the toothed rotating pinion, on a curve which is the involute of at least a part of the primitive perimeter or diameter of the toothed rotating pinion,
- the toothed rotating pinion of each actuating device connects with a sleeve so that one of the pinion or the sleeve transmits a torque to the other of the pinion or the sleeve,
- each actuating device is arranged such that connections between the toothed rotating pinion and both the selected rack and the sleeve are separable, so that the angular reference positions of the toothed rotating pinion relative to the selected rack and the sleeve can be adapted according to a predefined variation in the torque required for actuating the member, and
- two successive selected racks and two successive toothed rotating pinions in said group of actuating devices have a size ratio between 1.20 and 1.80,
- wherein said at least one actuator has an axis and comprises:
- a cylinder internally grooved on a periphery and open axially at two opposite end sides,
- a piston movable in the cylinder, along said axis of said actuator,
- cleats which each have a peripheral projecting zone,
- two opposite removable cylinder bottoms each axially closing a respective one of the two opposite end sides of the cylinder and both having external casings configured to receive the cleats, the projecting zone of the cleats being engaged in the grooves of the cylinder, and
- a first removable fixing device and a second removable fixing device respectively engaged in the respective two opposite cylinder bottoms through said cleats, wherein removal of at least one of the two opposite cylinder bottoms allows access to the piston in the cylinder.
Dependencies are inferred from the claim text.