Abstract A pressure detecting device in a torque control wrench has a rotor to be rotated by high pressure air, an output shaft and a device for generating impulse torque with the use of oil pressure on the output shaft due to rotation of the rotor. The device has a liner rotated by the rotor rotatably mounted on the output shaft. The device forms a high pressure chamber and a low pressure chamber in the liner for the generation of impulses on the output shaft, and has a hole therein having first and second ports communicating with the high and low pressure chambers, respectively. A valve is disposed in the hole for adjustably regulating the flow of oil from the first port to the second port and for generating a shut-off signal. The valve has a valve shaft adjustably mounted in the hole, having a passage therein communicating with the high pressure chamber. The passage has an opening at an end of the valve shaft. A relief valve is biased by a spring to close the opening of the passage and open upon the high pressure chamber reaching a set pressure. The liner has an end lid with a cylinder and a shut-off signal passage communicating the cylinder with the relief valve. A rod extends through the rotor and has a piston at an end thereof disposed in the cylinder, the opposite end of said rod being provided with a shut-off valve mechanism.
A pressure detecting device in a torque control wrench, comprising: a rotor to be rotated by high pressure air; an output shaft; a means for generating impulse torque with the use of oil pressure on said output shaft due to rotation of said rotor, said means comprising a liner rotated by said rotor rotatably mounted on said output shaft and having oil therein, said means forming a high pressure chamber and a low pressure chamber in said liner for the generation of impulses on said output shaft, and said means further comprising a hole in said liner having first and second ports communicating with said high and low pressure chambers, respectively; and a valve means disposed in said hole for adjustably regulating the flow of oil from said first port to said second port and for generating a shut-off signal, said valve means comprising a valve shaft adjustably mounted in said hole having a passage therein communicating with said high pressure chamber, said passage having an opening at an end of said valve shaft, a relief valve being biased by a spring to close said opening of said passage and open upon said high pressure chamber reaching a predetermined set pressure; said liner having an end lid with a cylinder and a shut-off signal passage communicating said cylinder with said relief valve; a rod extending through said rotor and having a piston at an end thereof disposed in said cylinder, the opposite end of said rod being provided with a shut-off valve mechanism.
Claim 2
Dependent Claim
253 words
A pressure detecting device in a torque control wrench, comprising: a rotor to be rotated by high pressure air; an output shaft; a means for generating impulse torque with the use of oil pressure on said output shaft due to rotation of said rotor, said means comprising a liner rotated by said rotor rotatably mounted on said output shaft and having oil therein, said means forming a high pressure chamber and a low pressure chamber in said liner for the generation of impulses on said output shaft, and said means further comprising a hole in said liner having first and second ports communicating with said high and low pressure chambers, respectively; and a valve means disposed in said hole for adjustably regulating the flow of oil from said first port to said second port and for generating a shut-off signal, said valve means comprising a valve shaft adjustably mounted in said hole having a passage therein communicating with said high pressure chamber, said passage having an opening at an end of said valve shaft, a relief valve being biased by a spring to close said opening of said passage and open upon said high pressure chamber reaching a predetermined set pressure; said liner having an end lid with a cylinder and a shut-off signal passage communicating said cylinder with said relief valve; a rod extending through said rotor and having a piston at an end thereof disposed in said cylinder, the opposite end of said rod being provided with a shut-off valve mechanism.
Claim 3
Dependent Claim
31 words
The pressure detecting device of claim 1, wherein said valve shaft comprises a rotatably adjustable regulating rod and a rotatably fixed valve shaft main body reciprocably moved by said regulating rod.
Claim 4
Dependent Claim
25 words
The pressure detecting device of claim 2, wherein said main body has a slot with a pin therein for maintaining said main body rotatably fixed.
Claim 5
Dependent Claim
47 words
The pressure device of claim 1, wherein said valve shaft has an orifice therein communicating with said passage for said shut-off signal and with said high pressure chamber and said low pressure chamber, said orifice being larger toward said high pressure chamber than said low pressure chamber.