Stair climbing conveyance

• US 3,166,138 A
• Filed: 10/26/1961
• Issued: 01/19/1965
• Est. Priority Date: 10/26/1961
• Status: Expired due to Term

• Current Assignee: Edward D. Dunn Jr
• Original Assignee: Edward D. Dunn Jr
• Inventors: Dunn, Edward D. Jr.
• Application Number:
  US04/147,795
• Time in Patent Office: 1,181 Days
• US Class Current: 180/9.23
• CPC Class Codes: A61G 5/061 for climbing stairs
• CPC Class Codes: A61G 5/066 with endless belts
• CPC Class Codes: B62D 55/075 Tracked vehicles for ascending or descending stairs, steep slopes or vertical surfacesmagnetic or pneumatic ground-engaging parts B62D55/265; chairs or multi-track cycles specially adapted for invalids A61G5/00
• CPC Class Codes: Y10S 280/10 Stair climbing chairs

Claims

1. A POWER OPERATED STAIR CLIMBING CONVEYANCE COMPRISING A MOBILE FRAME WITH A CHAIR SEAT MOUNTED THEREON AND INCLUDING TRANSVERSELY SPACED LONGITUDINAL FRAME SIDE MEMBERS, A PLURALITY OF PAIRS OF SUPPORT AND DRIVING UNITS MOUNTED UPON SAID FRAME SIDE MEMBERS AND INCLUDING FORWARD, CENTRAL AND REAR PAIRS OF UNITS, EACH PAIR OF UNITS HAVING ITS UNITS DISPOSED UPON THE EXTERIOR OUTER SURFACES OF SAID FRAME SIDE MEMBERS WITH EACH UNIT BEING MOUNTED SOLELY UPON ONE FRAME SIDE MEMBER, ADJUSTABLE CONNECTING MEANS EXTENDING TRANSVERSELY BETWEEN AND SECURED TO SAID FRAME SIDE MEMBERS AND CONNECTING THE LATTER FOR CONTROLLED MOVEMENT TOWARDS AND FROM EACH OTHER WHEREBY TO VARY THE WIDTH OF SAID CONVEYANCE, OPERATING MEANS CONNECTED TO SAID CONNECTING MEANS AND ACTUATING THE LATTER, A POWER SOURCE MOUNTED UPON SAID FRAME, DRIVING MEANS DISPOSED BETWEEN SAID FRAME SIDE MEMBERS AND CONNECTING SAID POWER SOURCE TO EACH UNIT OF A PAIR OF UNITS AND CONNECTING SAID CENTRAL PAIR OF UNITS TO SAID FORWARD AND REAR PAIRS OF UNITS, SAID DRIVING MEANS REMAINING CONNECTED TO SAID CENTRAL PAIR OF UNITS DURING ACTUATION OF SAID CONNECTING MEANS BY SAID OPERATING MEANS.