Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1974-12-23
1977-04-19
Purser, Ernest R.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173139, 173DIG2, 181 36A, 181 64A, B25D 1712
Patent
active
040182916
ABSTRACT:
An air hammer having a main body including an elongated cavity with a ram slidably mounted therein. The ram is driven by compressed air delivered through inlet means to the cavity in such a way as to drive the ram up and down to impact a tool. Exhaust from the hammer is directed into a plurality of elongated expansion chambers which are positioned within the body of the hammer. The expansion chambers extend to each end of the hammer body and exhaust to the atmosphere through open ports. Inserts are placed within the elongated expansion chambers to divide the chambers into properly sized cavities for greatest sound attenuation. Holes extend through these inserts for the eventual passage of exhausting air therethrough. The inserts are of neoprene having a durometer hardness of from 75 to 90. The size of the expansion chambers and the configuration and positioning of the inserts are intended to provide a muffling of the noise and shock of the exhaust. A shut off system is also provided to stop the hammer when it is unloaded.
REFERENCES:
patent: 3224527 (1965-12-01), Waldron
patent: 3332504 (1967-07-01), Lowery
patent: 3459275 (1969-08-01), Prillwitz et al.
patent: 3625295 (1971-12-01), Gunning
patent: 3739862 (1973-06-01), Gunning
patent: 3757875 (1973-09-01), Gunning
patent: 3847232 (1974-11-01), Klushin et al.
Allied Steel & Tractor Products, Incorporated
Pate III William F.
Purser Ernest R.
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