Patent ID: 7100493
Filing Date: 2006-09-05
Classification: F15B

Abstract:
1. A pneumatic actuator comprising a cylinder, a pair of pistons disposed slidably in the cylinder, a pressure-inspecting chamber enclosed by inside lateral faces of said pair of pistons opposed to each other and an inner peripheral face of said cylinder, an output shaft disposed in the pressure-inspecting chamber and provided with a pinion, a piston rod provided with rack teeth to be meshed with said pinion, said piston rod having opposite ends thereof connected to the inside lateral faces of the pair of pistons to transform motion of the pair of pistons into a rotary drive of the output shaft, and a pressure-detecting hole formed in the cylinder for establishing communication between said pressure-inspection chamber and an exterior, wherein the pressure-inspecting chamber or the pressure-detecting hole is provided therein with a pressure sensor for detecting an inner pressure of said pressure-inspecting chamber.