Pneumatic impact tool

Details Pneumatic impact tool Pneumatic impact tool

1977-03-11

1978-02-21

Purser, Ernest R.

Tool driving or impacting

Impacting devices

Hammer head constitutes piston of drive motor

173139, 173162, 91234, 91 5, B25D 906

Patent

active

040747778

ABSTRACT:
A pneumatic impact tool comprising a housing, an open ended cylinder inserted therein and a hammer piston reciprocably guided within the cylinder. In the forward end of the cylinder there is received the shank of a chisel onto which the hammer piston imparts impacts. The piston is a differential piston having its big end facing the chisel and forming around its rear, small diameter neck a rear annular, constantly pressurized chamber which continuously communicates with the pressure air inlet through a pulsator chamber. The forward cylinder chamber, enclosed between the chisel shank and the piston front area, is intermittently pressurized through an internal passage of the piston, which passage is periodically connected to the pressure air inlet by means of valve openings in the piston neck.

REFERENCES:
patent: 691420 (1902-01-01), Vaughan
patent: 742934 (1903-11-01), Vaughan et al.
patent: 1128416 (1915-02-01), Crump
patent: 2899934 (1959-08-01), Salengro
patent: 3241239 (1966-03-01), Ellis
patent: 3453657 (1969-07-01), Bolton et al.
patent: 3625295 (1971-12-01), Gunning
patent: 3851713 (1974-12-01), Fedosenko et al.
patent: 3920086 (1975-11-01), Goppen

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