Wheelchair

• US 7,179,200 B1
• Filed: 08/03/2005
• Issued: 02/20/2007
• Est. Priority Date: 08/03/2005
• Status: Expired due to Fees

• Current Assignee: David Wu
• Original Assignee: David Wu
• Inventors: Wu, David
• Primary Examiner(s): Crow; Stephen R.
• Application Number:
  US11/195,711
• Time in Patent Office: 566 Days
• Field of Search: 482/51, 482 66- 68, 482/904, D12/130, 135/65, 135/67, 280/87.05, 280/87.041
• US Class Current: 482/51
• CPC Class Codes: A61G 5/10 Parts, details or accessories
• CPC Class Codes: A61H 2003/046 with braking means
• CPC Class Codes: A61H 3/04 Wheeled walking aids for disabled persons A61H3/06 takes precedence

Abstract

A wheelchair is disclosed having two adjustment structures for allowing adjustment of the elevation of two handlebars relative to the two parallel vertical main frame bars thereof, each adjustment structure including a holder block fixedly provided at the top of the respective vertical main frame bar to accommodate the respective handlebar, a holding down block movably mounted in the holder block, and a locking lever pivoted to the holder block for moving a locating rod into one of a vertically aligned series of locating holes at the respective handlebar and forcing the holding down block against the respective handlebar.

Claims

1. A wheelchair comprising:

two vertical main frame bars, said vertical main frame bars each having a top end, a bottom end, and a wheel pivotally provided at said bottom end;

a back frame connected between said vertical frame bars to hold said vertical frame bars in parallel;

two side frame bars respectively and fixedly extending from said vertical main frame bars, said side frame bars each having a bottom end fixedly mounted with a foot member;

a seat fixedly supported on said side frame bars at a top side;

two handlebars respectively connected to the top ends of said vertical main frame bars, said handlebars each having a plurality of locating holes arranged at different elevations and aligned in a line; and

two adjustment structures respective set between said vertical main frame bars and said handlebars for locking said handlebars to said vertical main frame bars respectively;

wherein said vertical main frame bars are tubular frame bars each comprising a longitudinal sliding slot at the respective top end and a transverse locating hole below said longitudinal sliding slot;

said adjustment structures each comprise;

a holder block fixedly fastened to the top end of the respective vertical main frame bar, said holder block comprising a vertical coupling hole, which receives the top end of the respective vertical main frame bar, a transverse insertion slot and a locating hole disposed in communication with said vertical coupling hole corresponding to the longitudinal sliding slot and locating hole of the respective vertical main frame bar respectively, two parallel side lugs, said side lugs each having a transversely extending pivot, and two stop blocks respectively formed integral with said side lugs at an inner side;

a holding down block for holding down the respective handlebar, said holding down block comprising a stop wall, and a block body protruding from said stop wall and inserted through the transverse insertion slot of said holder block and the longitudinal sliding slot of the respective vertical main frame bar; and

a locking lever, said locking lever comprising a top cam for forcing said holding down block against the respective handlebar, a pivot hole axially extending through said cam and pivotally connected between the pivot holes of the side lugs of said holder block, a sliding groove disposed at an inner side, and a locating rod pivoted to a top end of said sliding groove and inserted through the locating hole of said holder block and the locating hole of the respective vertical main frame bar and movable in and out of one of the locating holes of the respective handlebar to lock/unlock the respective handlebar.

2. The wheelchair as claimed in claim 1, wherein said locking lever comprises a second pivot hole extending across the sliding groove thereof;

said locating rod has an eyelet disposed at one end and inserted into the sliding groove of said locking lever and pivotally connected to said second pivot hole with a pivot pin.

3. The wheelchair as claimed in claim 1, wherein said locking lever comprises two stop blocks extending from two distal ends of said cam for stopping against the two stop blocks of said holder block to limit the turning angle of said locking lever relative to said holder block.

4. The wheelchair as claimed in claim 1, wherein said block body of said holding down block has an inwardly curved front surface fitting the periphery of the respective handlebar.