Vibrationless impact tool

Details Vibrationless impact tool Vibrationless impact tool

1981-04-21

1983-06-21

Jones, Jr., James L.

Tool driving or impacting

Including means to vibrationally isolate a drive means from...

92 85A, 92 85B, 267137, B25D 1724

Patent

active

043889727

ABSTRACT:
A vibrationless pneumatic impact tool comprises: a housing; a cylinder axially displaceable in the housing; a hammer piston reciprocably driven by pressure air in the cylinder; a recoil cushioning air volume disposed between the housing and the cylinder; a first valve arrangement located in a fixed disposition relative to the housing; and a second valve arrangement located in a fixed disposition relative to the cylinder and arranged to cooperate with the first valve. The first valve comprises at least one air inlet opening communicating with a pressure air source and at least one air venting port communicating with the atmosphere. The second valve is arranged to selectively prevent communication between the at least one inlet opening and the recoil cushioning air volume while establishing communication between the at least one venting port and the recoil cushioning air volume when the cylinder is in its extreme forward position relative to the housing, and to selectively establish communication between the at least one inlet opening and the recoil cushioning air volume while preventing communication between the at least one venting port and the air volume when the cylinder is in its extreme rear position relative to the housing. This arrangement improves handling of the impact tool.

REFERENCES:
patent: 1804712 (1931-05-01), Stevens
patent: 3010431 (1961-11-01), Holdo
patent: 3245483 (1966-04-01), Etzkorn
patent: 3255832 (1966-06-01), Leavell
patent: 3727700 (1973-04-01), Amtsberg
patent: 3920086 (1975-11-01), Goppen et al.
patent: 4308926 (1982-01-01), Montabert

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