Pneumatic impact tool having improved vibration and noise attenuation
AssigneeT.C. Service Company
InventorsEdgar G. Henry, Frank W. Schossler, Donald K. Kuhl
Life of this patent
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Abstract
Vibration and noise are considerably reduced in a pneumatic impact tool by structure generating a novel vibration dampening action during tool operation. Dampening chamber members in the tool undergo compression when the reciprocating work member recoils as a method for such attenuation. Resilient seal members are further included in the tool construction to assist with the vibration dampening effect. Inclusion of oppositely biased spring members in the tool construction still further reduces the vibration attenuation.
Claims14
A pneumatic powered impact tool having improved vibration attenuation which comprises:
- (a) a housing member having a central passageway with front and back ends,
- (b) a closed end hollow sleeve member having front and back ends which is slidably engaged in the central passageway of said housing member and which includes a free piston member movably disposed therein with respect to both sleeve and housing members,
- (c) a reciprocating impact member closing the front end of said sleeve member for cyclical engagement with said free piston member,
- (d) a pneumatic valve mechanism closing the back end of said sleeve member for axially exerting pressurized fluid against opposite ends of said free piston member,
- (e) the back end of the central passageway in said housing member forming a pneumatic vibration dampening chamber devoid of mechanical spring means and with a volume which is compressed by rearward movement of said sleeve member, and
- (f) resilient seal means disposed at the back end of said sleeve member for cooperative association with said vibration dampening chamber.
A pneumatic powered impact tool having improved vibration attenuation which comprises:
- (a) a housing member having a central passageway, with front and back ends,
- (b) a closed end hollow sleeve member having front and back ends which is slidably engaged in the central passageway of said housing member and which includes a free piston member movably disposed therein with respect to both sleeve and housing members,
- (c) a pair of oppositely biased mechanical spring means engaged by said sleeve member so as to be alternately compressed when the sleeve member moves,
- (d) a reciprocating impact member closing the front end of said sleeve member for cyclical engagement with said free piston member,
- (e) a pneumatic valve mechanism closing the back end of said sleeve member for axially exerting pressurized fluid against opposite ends of said free piston member,
- (f) the back end of the central passageway in said housing member forming a pneumatic vibration dampening chamber devoid of mechanical spring means and with a volume which is compressed by rearward movement of said sleeve member, and
- (g) resilient seal means disposed at the back end of said sleeve member for cooperative association with said vibration dampening chamber.
A hand-held pneumatic powered chipping tool having improved vibration attenuation which comprises:
- (a) a cylindrical housing having a cylindrical central passageway with front and back ends,
- (b) a closed end hollow cylindrical sleeve member having front and back ends which is slidably engaged in the central passageway of said housing and which includes a free piston cylinder movably disposed therein with respect to both sleeve and housing members,
- (c) a pair of oppositely biased metal spring coils disposed intermediate the ends of said sleeve member for engagement therewith so as to be alternately compressed when the sleeve member moves,
- (d) a replaceable reciprocating chisel member closing the front end of said sleeve member for cyclical engagement with said free piston cylinder and detachably secured thereto with retainer means,
- (e) a pneumatic valve mechanism closing the back end of said sleeve member which axially supplies pressurized air to drive the piston cylinder forward and back cyclically within said sleeve member,
- (f) the back end of the central passageway in said housing forming a pneumatic vibration dampening cylindrical chamber deviod of mechanical spring means and with a volume which is compressed by rearward movement of said sleeve member, and
- (g) elastometric seal means having an O-ring configuration which are affixed to the back end of the said sleeve member for cooperative association with said vibration dampening cylindrical chamber.
Dependencies are inferred from the claim text.