Patent ID: 8869834
Filing Date: 2014-10-28
Classification: F15B,F16K,Y10T

Abstract:
1. A pneumatic control device, comprising: a direction control rod being operated between a positive position, a neutral position and an opposite position, the direction control rod connected to a first direction valve and a second direction valve, each of the first direction valve and the second direction valve being operated between an activated status and a shut-off status, when the direction control rod is in the positive position, the first direction control valve being in the activated status and the second direction control valve being in the shut-off status, when the direction control rod is in the opposite position, the first direction control valve being in the shut-off status and the second direction control valve being in the activated status, when the direction control rod is in the neutral position, both of the first and second direction control valves are in the shut-off status, when the first direction control valve or second direction control valve is activated, pressurized air respectively passing through the first direction control valve or second direction control valve; wherein the direction control rod is connected to a power switch device, the power switch device includes: wherein when the second end of the positioning rod is restricted in the positioning recess of the cam, the seal member closes the inlet, when the button is operated and activates the lever of the cam, the positioning rod is driven by the cam and drives the central rod, the valve rod and the seal member to open the inlet, and the positioning rod is positioned at the protruding portion of the cam, when the direction control rod moves toward the positive position, one of the activation members drives the first direction control valve to be activated and the second direction control valve to be shut off, when the direction control rod moves toward the opposite position, the other one of the activation members drives the second direction control valve to be activated and the first direction control valve to be shut off, the link drives the direction control rod to move the return rod to push the cam, the second end of the positioning rod moves away from the protruding portion of the cam and is restricted in the positioning recess of the cam, the central rod, the valve rod and the seal member return to close the inlet.