The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2000
Filed:
May. 11, 1999
Kenji Mukoyama, Anjo, JP;
Yukiyasu Okouchi, Anjo, JP;
Masaki Sakuragi, Anjo, JP;
Junichi Iwakami, Anjo, JP;
Makita Corporation, Anjo, JP;
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.