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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 up

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.

대표청구항 ▼

[ What is claimed is:] [12.] A pneumatic tool comprising:a housing;a cylinder disposed within said housing;a piston slidably movable within said cylinder, said piston having a fastener driver;an upper piston chamber and a lower piston chamber defined within said cylinder on an upper side and a lower

[ What is claimed is:] [12.] A pneumatic tool comprising:a housing;a cylinder disposed within said housing;a piston slidably movable within said cylinder, said piston having a fastener driver;an upper piston chamber and a lower piston chamber defined within said cylinder on an upper side and a lower side of said piston, respectively;a compressed air supply;a compressed air supply controller coupled to said compressed air supply, to said upper piston chamber and to said lower piston chamber, comprising:a variable pressure chamber and a valve, said variable pressure chamber being connected to said compressed air supply, and said valve being operable to connect and disconnect said variable pressure chamber and said lower piston chamber in response to the position of said piston relative to said cylinder; andsaid variable pressure chamber maintaining a predetermined volume, irrespective of the operation of said compressed air supply controller.