Cushioning device for a piston of a pneumatically operable drivi

Details Cushioning device for a piston of a pneumatically operable drivi Cushioning device for a piston of a pneumatically operable drivi

1978-06-07

1980-06-10

Hershkovitz, Abraham

Motors: expansible chamber type

Working member position responsive motive fluid control

Working member carries part within working chamber which...

91407, 91410, 92 85R, 92 85B, 227130, F15B 1522

Patent

active

042066875

ABSTRACT:
The invention relates to a cushioning device for a piston of a pneumatically operable driving tool which includes a cylinder, wherein a drive piston connected to a driver blade is axially movable; including further a bumper at the lower end of the cylinder and an annular chamber connected to a fluid power reservoir; this chamber is located underneath the piston and is surrounding the driver blade. The annular chamber, created by the piston and a wall, generally parallel to the face of the piston, will be reduced in volume to a certain extent when the wall impacts on the bumper to reduce the noise generated during the driving action.

REFERENCES:
patent: 3273469 (1966-09-01), Doyle
patent: 3434643 (1969-03-01), Wandel
patent: 3479926 (1969-11-01), Hillier
patent: 3608437 (1971-09-01), Little
patent: 3905278 (1975-09-01), Ourdouillie

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