Tool driving or impacting – Passage in manipulating handle for drive motor motive fluid – Motive fluid control valve in handle passage
Patent
2000-04-04
2000-12-26
Smith, Scott A.
Tool driving or impacting
Passage in manipulating handle for drive motor motive fluid
Motive fluid control valve in handle passage
B23B 4504
Patent
active
061643874
ABSTRACT:
A multistage push button for a pneumatic tool is provided to control the magnitude of air pressure introduced into the pneumatic tool at different stages. The push button includes a main rod movably mounted in a seat of the push button and having a diameter-reduced middle portion and an inclined shoulder portion behind the middle portion. The seat has at least a press spring set therein to normally push a steel ball into the seat. When the main rod is pushed inward with the inclined shoulder portion contacting with the steel ball, an innermost section of the main rod having a larger outer diameter is moved out of the seat to admit a smaller amount of air into the pneumatic tool. And when the inclined shoulder portion pushes the steel ball radially outward, a next inner section of the main rod having a smaller outer diameter is moved out of the seat to admit more air into the pneumatic tool.
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patent: 5303781 (1994-04-01), Lin
patent: 5377769 (1995-01-01), Hasuo et al.
patent: 5797462 (1998-08-01), Rahm
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