Stair traversing wheel chair mechanism

• US 3,295,858 A
• Filed: 10/20/1965
• Issued: 01/03/1967
• Est. Priority Date: 10/20/1965
• Status: Expired due to Term

• Current Assignee: Harry W. Addison Jr
• Original Assignee: Harry W. Addison Jr
• Inventors: Addison, Harry W. Jr.
• Application Number:
  US04/540,108
• Time in Patent Office: 440 Days
• US Class Current: 280/5.3
• CPC Class Codes: A61G 5/061 for climbing stairs
• CPC Class Codes: Y10S 280/10 Stair climbing chairs

Claims

1. A WHEEL CHAIR FOR ASCENDING AND DESCENDING STAIR FLIGHTS INCLUDING:

(A) A CHAIR SUPPORT FRAME;

(B) A FIRST PAIR OF WHEEL MEMBERS MOUNTED FOR ROTATION ON ONE END OF SAID FRAME;

(C) A PAIR OF ROTATABLY MOUNTED SUPPORT STEMS ON THE OTHER END OF SAID FRAME;

(D) A SECOND PAIR OF WHEEL MEMBERS ROTATABLY MOUNTED ON SAID SUPPORT STEMS;

(E) MEANS FOR ROTATING SAID WHEEL SUPPORT STEMS TO ADJUST THE WHEEL BASE LENGTH OF A CHAIR SUCH THAT A SITTING PORTION OF A CHAIR MAY BE MAINTAINED IN PROPER SITTING POSITION WHEN THE CHAIR IS PLACED ON A STAIR FLIGHT;

(F) A PAIR OF PISTON UNITS PIVOTALLY MOUNTED ON A PORTION OF THE FARME FOR OSCILLATORY MOVEMENT IN A VERTICAL PLANE ADJACENT THE SIDES OF SAID FRAME HAVING A STAIR CONTACTING PORTION ON THE BOTTOM END THEREOF FOR CONTACTING A STAIR;

(G) MEANS FOR APPLYING PRESSURE TO SAID PISTON FOR LIFTING AT LEAST A PORTION OF THE CHAIR WHEREBY AT LEAST SAID PORTION OF THE CHAIR MAY BE LIFTED UPWARDLY AND WILL PIVOT ABOUT SAID PISTON MEANS TO ELEVATE THE SAME TO THE NEXT SUCCEEDING STEP.