What is claimed is:
1. A pneumatic tool comprising:
a barrel portion and a handle in which a passage is defined and adapted to be connected to an air compressor, a casing securely received in said barrel portion and a rotator rotatably received in said casing, a chuck device connected to said rotator, a tube connected to said casing, a first passage and a second passage respectively connected in communication between said casing and said tube, an inlet defined radially through said tube and communicating with said passage in said handle, and
a control bar received in said tube and two recesses respectively defined in an outer periphery of said control bar, said two recesses movably communicating with said first passage and said second passage in said tube.
2. The tool as claimed in claim 1, wherein said control bar has a separation flange and said two recesses are separated by said separation flange, said control bar movable in a longitudinal direction of said tube and positions of said two recesses are moved relative to said tube when pulling said control bar.
3. The tool as claimed in claim 2 further comprising a block extending radially outward from a periphery one of said recesses.
4. The tool as claimed in claim 1, wherein said two recesses each are defined in a form of a spiral groove.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-20. (canceled)
21. A semiconductor integrated liquid crystal drive device for use with a liquid crystal display panel that comprises:
a plurality of source electrodes;
a plurality of gate electrodes;
an external terminal; and
a plurality of pixels each having a transistor and a liquid crystal layer, wherein the transistor has a source-drain path coupled between one of the plurality of source electrodes and the corresponding liquid crystal layer, and a gate coupled to one of the plurality of gate electrodes, and wherein the liquid crystal layer is coupled to the external terminal,
the semiconductor integrated liquid crystal drive device comprising:
a first terminal to which a first reference voltage is supplied;
a second terminal to which a second reference voltage is supplied;
a third terminal to which a third reference voltage is supplied;
a fourth terminal to be coupled to the external terminal of the liquid crystal display panel;
a first voltage generation circuit coupled to the first and the second terminal, and generating a first voltage higher than the first reference voltage; and
a second voltage generation circuit coupled to the first and the second terminal, and generating a second voltage lower than the second reference voltage,
wherein a voltage supplied to the fourth terminal is changed from the first voltage to the second reference voltage and, subsequently, changed from the second reference voltage to the second voltage.
22. A semiconductor integrated liquid crystal drive device according to claim 21, further comprising:
a first switching element which is provided between the second terminal and the fourth terminal and which is short-circuiting when the voltage supplied to the fourth terminal is changed from the first voltage to the second reference voltage;
a second switching element which is provided between the second voltage generation circuit and the fourth terminal and which is short-circuiting when the voltage supplied to the fourth terminal is changed from the second reference voltage to the second voltage; and
a control circuit which controls the first switching element and the second switching element so that a period when both the first switching element and the second switching element are turned off is provided between a short circuit time of the first switching element and a short circuit time of the second switching element.
23. A semiconductor integrated liquid crystal drive device according to claim 21, further comprising:
a gate driver which generates a selection signal to be supplied to one of the plurality of gate electrodes; and
a source driver which generates display data to be supplied to the plurality of source electrodes.