Dental patients' reclining chair

• US 3,150,898 A
• Filed: 12/31/1962
• Issued: 09/29/1964
• Est. Priority Date: 12/31/1962
• Status: Expired due to Term

• Current Assignee: Lewis Knudson William
• Original Assignee: Lewis Knudson William
• Inventors: LEWIS KNUDSON WILLIAM
• Application Number:
  US04/248,561
• Time in Patent Office: 638 Days
• US Class Current: 297/329
• CPC Class Codes: A61G 15/02 Chairs with means to adjust position of patient; Controls therefor

Claims

1. A CHAIR FOR USE BY DENTISTS AND THE LIKE COMPRISING;

A SEAT, SAID SEAT BEING ARCUATELY FORMED TO POSITION THE KNEE AREA OF A PERSON SITTING THEREON AT A HIGHER LEVEL THAN ARE HIS HIPS OR FEET, AND TO PROVIDE SUPPORT FOR HIS ENTIRE LOWER BODY;

A BACK;

MEANS PIVOTALLY CONNECTING SAID BACK TO SAID SEAT;

A BASE;

LINKS PIVOTALLY INTERCONNECTING SAID BASE AND SAID SEAT, SAID SEAT AND SAID BACK BEING SUPPORTED ON SAID LINKS;

A FIRST HYDRAULIC MOTOR, INCLUDING A CYLINDER AND A PISTON ROD;

MEANS CONNECTING SAID CYLINDER ADJACENT THE INTERSECTION OF SAID SEAT AND SAID BACK;

MEANS CONNECTING SAID PISTON ROD TO SAID BASE BENEATH THE PIVOT CONNECTION OF THE BACK AND SEAT WHEN THEY ARE POSITIONED INTERMEDIATE THEIR EXTREME FORWARD AND REAR POSITIONS;

A SECOND HYDRAULIC MOTOR, SAID SECOND MOTOR COMPRISING A CYLINDER PIVOTALLY CONNECTED TO THE UNDERSIDE OF SAID SEAT, A PISTON IN SAID CYLINDER, A PISTON ROD FIXED TO SAID PISTON AND EXTENDING THROUGH THE OTHER END OF SAID CYLINDER, A SLEEVE SURROUNDING SAID ROD AND HAVING ONE CLOSED END, SAID SLEEVE SLIDABLY EXTENDING INTO SAID CYLINDER TO ABUT SAID PISTON, AND A BLEED PORT THROUGH THE WALL OF THE SLEEVE ADJACENT SAID CLOSED END, WHICH END IS PIVOTALLY CONNECTED TO SAID BACK AT THE BOTTOM THEREOF;

AND CONTROL MEANS FOR SAID FIRST AND SECOND HYDRAULIC MOTORS, SAID CONTROL MEANS INCLUDING A HYDRAULIC SYSTEM COMPRISING A LIQUID RESERVOIR, AN ELECTRIC MOTOR DRIVEN PUMP, A CONDUIT BETWEEN SAID RESERVOIR AND THE INTAKE SIDE OF THE PUMP, SUPPLY CONDUITS THROUGH WHICH LIQUID FLOWS FROM THE PUMP TO SAID HYDRAULIC MOTORS, CONDUITS FOR EXHAUSTING LIQUID FROM SAID HYDRAULIC MOTORS TO THE INTAKE SIDE OF THE PUMP, A SUPPLY VALVE IN THE SUPPLY CONDUIT FOR EACH MOTOR, AN EXHAUST VALVE IN THE EXHAUST CONDUIT FOR EACH MOTOR, AN ACTUATOR FOR THE SUPPLY AND EXHAUST VALVES OF EACH FIRST MOTOR, AN ACTUATOR FOR THE SUPPLY AND EXHAUST VALVES OF THE SECOND MOTOR, A BYPASS CONDUIT FROM THE OUTLET TO THE INTAKE OF THE PUMP, A PRESSURE RELIEF VALVE IN THE BY-PASS CONDUIT, AND AN ELECTRICAL SYSTEM COMPRISING ELECTRICAL SWITCH MEANS CLOSED BY SUPPLY-VALVE-ACTUATING-MOVEMENT OF EITHER OF SAID ACTUATORS TO CLOSE A CIRCUIT AND ENERGIZE THE PUMP MOTOR.