Driving system for passing fly-over obstacles by invalid chair

• US 7,396,023 B2
• Filed: 08/26/2005
• Issued: 07/08/2008
• Est. Priority Date: 08/27/2004
• Status: Expired due to Fees

• Current Assignee: Stairbike A.S.
• Original Assignee: Stairbike A.S.
• Inventors: Vlk, Josef
• Primary Examiner(s): Boehler; Anne Marie
• Application Number:
  US11/574,126
• Publication Number:
  US 20070246906A1
• Time in Patent Office: 1,047 Days
• Field of Search: 280 52- 532, 280/250.1, 280/304.1, 280/DIG.10, 280/249, 280/250, 280/259
• US Class Current: 280/5.26
• CPC Class Codes: A61G 5/026 Cranks or hand wheels
• CPC Class Codes: A61G 5/061 for climbing stairs
• CPC Class Codes: A61G 5/065 with three or more wheels mounted on a rotary cross member, e.g. spiders or spoked wheels with small wheels at the end of the spokes

Abstract

A driving system allows an invalid chair having a seating structure, wheels on both sides of the seating structure and at least one front stabilizing wheel, to pass obstacles. The driving system has arms secured to both sides of the seating structure and on which shafts of the wheels are arranged slidingly within two extreme positions. Cranks are on both sides of the seating structure and rotary cross engagement members are at the rear and on both sides of the seating structure and have arms which are terminated with adhesive end pieces. Each crank is connected to a respective rotary cross engagement member through a geared transmission for transmission of rotary movement of the crank to the rotary cross engagement member, and the geared transmission is provided with a flap for preventing reverse rotating of the crank.

Claims

1. Driving system for passing over obstacles by an invalid chair formed by a seating structure (2), wheels (8) arranged on both sides of the seating structure (2) and at least one front stabilizing wheel (10), characterized in that the invalid chair is formed by arms (6) which are securable to the seating structure (2) on both of seating structure sides and on which shafts of wheels (8) are arranged slidingly between two end positions, cranks (9) arranged on both sides of the seating structure (2), and rotary cross engagement members (3) which are arranged in rear part of the seating structure (2) on both sides of the seating structure and have arms which are terminated with adhesive end pieces (4), wherein each of the cranks (9) is connected to respective a rotary cross engagement member (3) arranged on the same side of the seating structure (2) through a geared transmission (5) for transmission of rotary movement of the crank (9) to the rotary cross engagement member (3), and the geared transmission (5) is provided with a flap (7) for preventing reverse rotating of the crank (9).