Piston type respirator

• US 3,225,758 A
• Filed: 12/30/1959
• Issued: 12/28/1965
• Est. Priority Date: 12/30/1959
• Status: Expired due to Term

• Current Assignee: Trier Morch Ernst
• Original Assignee: Trier Morch Ernst
• Inventors: TRIER MORCH ERNST
• Application Number:
  US03/862,869
• Time in Patent Office: 2,190 Days
• US Class Current: 128/204.14
• CPC Class Codes: A61M 16/0057 Pumps therefor
• CPC Class Codes: A61M 16/0063 Compressors
• CPC Class Codes: A61M 16/107 in the inspiratory path
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: Y10T 137/2564 Plural inflows

Claims

15. IN A RESPIRATOR, A CASING INCLUDING SIDE WALLS AND AN END WALL HINGEDLY CONNECTED TO ONE OF SAID SIDE WALLS AND ADAPTED FOR LATCHING ENGAGEMENT WITH THE OTHER SIDE WALL, A PUMP MOUNTED IN SAID CASING LONGITUDINALLY THEREOF, SAID PUMP INCLUDING A CYLINDER HAVING AN END WALL DISPOSED ADJACENT THE END WALL OF SAID CASING, A PISTON RECIPROCABLE IN SAID CYLINDER TO THE SIDE OF THE CYLINDER END WALL OPPOSITE THE CASING END WALL, A PISTON ROD EXTENDING FROM SAID PISTON OUT THE OPPOSITE END OF SAID CYLINDER, A MOTOR AND VARIABLE SPEED TRANSMISSION MOUNTED IN SAID CASING ADJACENT SAID CYLINDER AND INCLUDING AN OUTPUT SHAFT EXTENDING TRANSVERSELY OF SAID PISTON ROD, AN ELONGATE CRANK ARM SECURED TO SAID SHAFT TRANSVERSELY THEREOF, A CAM MEMBER SLIDABLY BUT NON-ROTATABLY MOUNTED ON SAID CRANK ARM FOR MOVEMENT RADIALLY OF SAID SHAFT AND CONNECTED TO SAID PISTON ROD FOR RECIPROCATING THE PISTON, A ROTARY DRIVE MEMBER JOURNALLED ON SAID ARM AND OPERATIVELY CONNECTED TO SAID CAM MEMBER FOR MOVING THE SAME RELATIVE TO SAID ARM, A DRIVE WHEEL CONNECTED TO SAID DRIVE MEMBER AND ORBITING ABOUT SAID SHAFT UPON ROTATION OF SAID SHAFT, A PAIR OF ARCUATE MEMBERS CONFORMING TO AND DISPOSED TO OPPOSITE SIDES OF THE ORBITAL PATH OF MOVEMENT OF SAID WHEEL, MEANS FOR SELECTIVELY MOVING SAID ARCUATE MEMBERS INTO THE PATH OF ORBITAL MOVEMENT OF SAID WHEEL FOR CAUSING SAID WHEEL TO BE ROTATED SELECTIVELY IN OPPOSITE DIRECTIONS THEREBY TO MOVE SAID CAM MEMBER TOWARD AND AWAY FROM SAID SHAFT DURING OPERATION OF THE RESPIRATOR TO VARY THE DISPLACEMENT OF SAID PISTON AND THEREBY THE VOLUME OF RESPIRATORY FLUID, MEANS INDEPENDENT OF THE LAST-NAMED MEANS FOR VARYING THE SPEED OF ROTATION OF SAID SHAFT DURING OPERATION OF THE RESPIRATOR TO VARY THE RATE OF RESPIRATION, SAID PUMP INCLUDING AN INLET AND AN OUTLET COMMUNICATING WITH THE SPACE BETWEEN SAID PISTON AND THE END WALL OF SAID CYLINDER, AN APERTURE THROUGH SAID CYLINDER END WALL, A BELLOWS DISPOSED BETWEEN AND SECURED TO SAID END WALLS IN SURROUNDING RELATION TO SAID APERTURE, A VALVE MEMBER CARRIED BY SAID CASING END WALL WITHIN SAID BELLOWS, SAID VALVE MEMBER CLOSING SAID APERTURE WHEN SAID CASING END WALL IS LATCHED TO SAID OTHER SIDE WALL, SAID CASING END WALL BEING OSCILLATABLE ABOUT ITS HINGED CONNECTION FOR CONSTITUTING SAID BELLOWS, A HAND PUMP HAVING AS ITS INLET AND ITS OUTLET THE SAID INLET AND OUTLET OF SAID PUMP, A ONE-WAY CHECK VALVE IN THE INLET OF SAID PUMP, AN EXHALATION VALVE SPACED FROM SAID PUMP AND LOCATED ADJACENT THE PATIENT, SAID EXHALATION VALVE INCLUDING AN INLET, AN OUTLET TO ATMOSPHERE, AN OUTLET DISPOSED BETWEEN THE INLET AND SAID OUTLET TO ATMOSPHERE FOR CONNECTION WITH THE PATIENT, A VALVE SEAT BETWEEN SAID INLET AND THE OUTLET TO THE PATIENT, A VALVE SEAT BETWEEN SAID OUTLETS, AND A VALVE MEMBER MOVABLE BETWEEN SAID SEATS, A CONDUIT EXTENDING FROM THE OUTLET OF THE HUMIDIFIER TO THE INLET OF SAID EXHALATION VALVE, THE VALVE MEMBER OF SAID EXHALATION VALVE BEING RESPONSIVE TO THE PRESSURE PULSATIONS PRODUCED BY SAID PUMP FOR MOVEMENT ALTERNATIVELY BETWEEN THE FIRSTNAMED VALVE SEAT AND THE SECOND-NAMED VALVE SEAT THEREBY TO CONTROL ALTERNATE SUPPLY OF FLUID FROM THE PUMP TO THE PATIENT AND VENTING OF THE PATIENT TO ATMOSPHERE FOR CONTROLLING THE PRESSURE PROFILE OF THE RESPIRATORY CYCLE.