Importance

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Abstract

A linear pull actuator converts working fluid such as halogenated hydrocarbons into vapor by electrical heating element housed inside a shell, generating a vapor pressure against a rolling membrane secured inside actuator so as to respond to the vapor pressure linearly delivering an end force to an integral first piston and tube assembly which is adaptable to axially move inside the housing proper against spring biasing means along with an externally mounted second piston of a piston and rod assembly secured thereto by a spring so as to have rod end passing centrally through the tube protrude a distance out of the shell end for a position change from a first rod end protruded when electrical heater is not energized electrically to a second rod end retracted position with work when pulled away by the pistons due to the vapor pressure of the working fluid when the electrical heater is energized electrically, de-energization of the electrical heating element electrically returns the rod end to the first protruded position due to the spring biasing force action over pistons automatically when vapor pressure dissipates. The shell is divided into an annular sealed heater compartment with working fluid housed therein and closed by two disk-like membranes secured permanently to the central tube of the piston and tube assembly, and an atmospheric compartment housing spring biasing means and also second piston and rod assembly with second piston abutting the first piston on one side while on another-it is backed up by a spring secured inside a shell cap so as to have rod enter centrally the tube to protrude therethrough to the opposite shell end, including adjustment of spring tension the rod end experiences when in the first position, and also shell mounting threads to a work piece, to facilitate an easy adaption of actuator to various applications be it a valve housing, a pump housing or other industrial/consumer device requiring pull type actuator with capability of an easy access for maintenance and replacement of parts.

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First Claim