Driving System for Passing Fly-Over Obstacles by Invalid Chair

• US 20070246906A1
• Filed: 08/26/2005
• Published: 10/25/2007
• Est. Priority Date: 08/27/2004
• Status: Active Grant

• Current Assignee: Stairbike A.S.
• Original Assignee: Stairbike A.S.
• Inventors: Vlk, Josef
• Granted Patent: US 7,396,023 B2
• Time in Patent Office: Days
• US Class Current: 280/250.100
• 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 fly-over obstacles by invalid chair formed by seating structure (2), wheels (8) arranged on both sides of the seating structure (2) and at least one front stabilising wheel (10), characterized in that it is formed by arms (6) which are securable to the seating structure (2) on both of its sides and on which shafts of wheels (8) are arranged slidingly within 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 its both sides and have arms which are terminated with adhesive end pieces (4), wherein each of the cranks (9) is connected to respective rotary cross engagement member (3) arranged on the same side of the seating structure (2) through 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 flap (7) for preventing reverse rotating of the crank (9).