Pneumatic tool

Details Pneumatic tool Pneumatic tool

1999-05-11

2000-11-14

Smith, Scott A.

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including supply magazine for constantly urged members

227 8, 227142, B25C 104

Patent

active

061457272

ABSTRACT:
A pneumatic tool, such as a nailer, includes a housing, a cylinder disposed within the housing, and a piston slidably movable within the cylinder. The piston has a driver for driving fasteners, such as nails. An upper piston chamber and a lower piston chamber are defined within the cylinder on an upper side and a lower side of the piston, respectively. A control device is provided for controlling the supply of compressed air from a compressed air supply device to the upper piston chamber and to the lower piston chamber to drive the fasteners into a workpiece. The control device includes a variable pressure chamber and a valve. The variable pressure chamber is always connected to the compressed air supply device. The valve is operable to connect and disconnect the variable pressure chamber and the lower piston chamber in response to the position of the piston relative to the cylinder. A device is provided to maintain a predetermined volume in the variable pressure chamber, irrespective of the operation of the control device.

REFERENCES:
patent: 3438449 (1969-04-01), Smith
patent: 5131579 (1992-07-01), Okushima et al.
patent: 5441192 (1995-08-01), Sugita et al.
patent: 5495973 (1996-03-01), Ishizawa et al.
patent: 5671880 (1997-09-01), Ronconi
patent: 5715982 (1998-02-01), Adachi

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