Air compressor having a high pressure output

An air compressor comprising:

• a housing having an elongated cylindrical bore and a generally closed crankcase chamber;
• a piston having a head end portion and a connecting rod end portion and a side wall of predetermined length, said piston being adapted for reciprocating movement in said cylindrical bore;
• a rotatable crankshaft means in said crankcase chamber;
• a connecting rod for interconnecting said crankshaft means and said piston, rotation of said crankshaft means causing reciprocating movement of said piston;
• a head means attached to said housing at the outer end of said cylindrical bore, and having an output chamber therein;
• valve means located adjacent to said outer end of said cylindrical bore, said valve means being normally closed but adapted to open and pass air to said output chamber responsive to compressed air produced by the movement of said piston in said bore toward said head means.
• inlet means for admitting air through at least one opening in said housing into the side of said cylindrical bore, said opening being in communication with the exterior of said housing;
• said piston having a stroke of first predetermined length, said first predetermined length being greater than twice said piston side wall predetermined length, said inlet means being adapted to admit air into said cylinder bore when said piston is located at either end of its stroke;
• an outlet means adapted to discharge compressed air from said crankcase chamber for use by other equipment;
• oil inlet means adapted to permit oil to be admitted into said crankcase chamber and oil outlet means adapted to discharge oil from said crankcase chamber, said oil inlet means being located to admit oil into the upper portion of said crankcase chamber and said oil outlet means being located to discharge oil from the lower portion of said crankcase chamber so that gravity aids in the movement of oil through said crankcase chamber;
• means connected to said crankshaft means for rotating the same, incremental rotation of said crankshaft means causing said piston to move away from said head means and permit air to enter said cylindrical bore, while compressing air within said crankcase chamber and providing a secondary compressed air available for discharge through said outlet means;
• further rotation of said crankshaft means causing said piston to move toward said head means while compressing the air in said cylindrical bore, the air causing said valve means to open and pass into said output chamber and then close, while admitting air through said at least one opening in said housing into said crankcase chamber.

An air compressor comprising:

• a housing having an elongated cylindrical bore and a generally closed crankcase chamber;
• a piston having a head end portion and a connecting rod end, said piston being adapted for reciprocating movement in said cylindrical bore;
• a rotatable crankshaft means in said crankcase chamber;
• a connecting rod for interconnecting said crankshaft means and said piston, rotation of said crankshaft means causing reciprocating movement of said piston;
• a head means attached to said housing at the outer end of said cylindrical bore, and having an output chamber therein;
• valve means located adjacent to said outer end of said cylindrical bore, said valve means being normally closed but adapted to open and pass air to said output chamber responsive to compressed air produced by the movement of said piston in said bore toward said head means;
• inlet means for admitting air through said housing into the side of said cylindrical bore;
• means connected to said crankshaft means for rotating the same, incremental rotation of said crankshaft means causing said piston to move away from said head means and permit air to enter said cylindrical bore, further rotation causing said piston to move toward said head means while compressing the air, the air causing said valve means to open and pass into said output chamber and then close;
• oil inlet means adapted to permit oil to be admitted into said crankcase chamber and oil outlet means adapted to discharge oil from said crankcase chamber, said oil inlet means comprising a check valve biased in a closed position and adapted to admit oil into said crankcase in response to a predetermined differential pressure.

An air compressor comprising:

• a housing having an elongated cylindrical bore and a crankcase chamber;
• a piston having a head end portion and a connecting rod end portion, said piston being adapted for reciprocating movement in said cylindrical bore;
• a rotatable crankshaft means in said crankcase chamber;
• a connecting rod for interconnecting said crankshaft means and said piston, rotation of said crankshaft means causing reciprocating movement of said piston;
• a head means attached to said housing at the outer end of said cylindrical bore, and having an output chamber therein;
• valve means located adjacent to said outer end of said cylindrical bore, said valve means being normally closed but adapted to open and pass air to said output chamber responsive to compressed air produced by the movement of said piston in said bore toward said head means;
• inlet means for admitting air through said housing into the side of said cylindrical bore;
• means connected to said crankshaft means for rotating the same, incremental rotation of said crankshaft means causing said piston to move away from said head means and permit air to enter said cylindrical bore, further rotation causing said piston to move toward said head means while compressing the air, the air causing said valve means to open and pass into said output chamber and then close;
• said housing comprising a main casting which includes said cylindrical bore and a portion of said crankcase chamber, said housing including an end casting adapted to be connected to said main casting near said crankcase chamber, said end casting and main casting being connected along a separation line located at the center of said crankshaft means so that said piston, connecting rod and crankshaft means can be selectively inserted and removed from said housing when said end casting is removed, and means for attaching said end casting to said main casting.

An air compressor comprising:

• a housing having an elongated cylindrical bore and a generally closed crankcase chamber;
• a piston having a head end portion and a connecting rod end portion, said piston being adapted for reciprocating movement in said cylindrical bore;
• a rotatable crankshaft means in said crankcase chamber;
• a connecting rod for interconnecting said crankshaft means and said piston, rotation of said crankshaft means causing reciprocating movement of said piston;
• a head means attached to said housing at the outer end of said cylindrical bore, and having an output chamber therein;
• valve means located adjacent to said outer end of said cylindrical bore, said valve means being normally closed but adapted to open and pass air to said output chamber responsive to compressed air produced by the movement of said piston in said bore toward said head means, said output chamber having a predetermined nominal output pressure;
• said valve means comprising a support plate located between said housing at said outer end of said cylindrical bore and said head means, said support plate having a plurality of openings for communicating air from said cylindrical bore to said output chamber, and a normally closed reed valve means attached to said support plate overlying said plurality of openings, and adapted to open in response to a predetermined differential pressure in said cylindrical bore relative to the pressure in said output chamber, said valve means including means for attaching said reed valve means to said support plate, said reed valve means being of sufficient size and thickness so that it does not deform in response to the pressure in said outlet chamber, said nominal output pressure being approximately 15 to approximately 20 times greater than said differential pressure;
• inlet means for admitting air through said housing into the side of said cylindrical bore;
• means connected to said crankshaft means for rotating the same, incremental rotation of said crankshaft means causing said piston to move away from said head means and permit air to enter said cylindrical bore, further rotation causing said piston to move toward said head means while compressing the air, the air causing said valve means to open and pass into said output chamber and then close.

An air compressor comprising:

• a housing having an elongated cylindrical bore and a generally closed crankcase chamber;
• a piston having a head end portion and a connecting rod end portion and a side wall of predetermined length, said piston being adapted for reciprocating movement in said cylindrical bore;
• said piston having at least a first annular groove located near said head end of said piston adapted to receive a sealing oil ring means, said piston having a plurality of openings communicating said groove with the interior of said piston, and an oil ring means located in said first annular groove adapted to pass oil from between said cylindrical bore and said piston side wall to the interior of said piston;
• a rotatable crankshaft means in said crankcase chamber;
• a connecting rod for interconnecting said crankshaft means and said piston, rotation of said crankshaft means causing reciprocating movement of said piston;
• a head means attached to said housing at the outer end of said cylindrical bore, and having an output chamber therein;
• valve means located adjacent to said outer end of said cylindrical bore, said valve means being normally closed but adapted to open and pass air to said output chamber responsive to compressed air produced by the movement of said piston in said bore toward said head means;
• inlet means for admitting air through said housing into the side of said cylindrical bore;
• means connected to said crankshaft means for rotating the same, incremental rotation of said crankshaft means causing said piston to move away from said head means and permit air to enter said cylindrical bore, further rotation causing said piston to move toward said head means while compressing the air, the air causing said valve means to open and pass into said output chamber and then close.