초록 ▼

A wheel chair includes a back support pivotally attached to a base frame and having a handle and a hand grip pivotally attached to the handle, a housing is secured to the base frame and includes a chamber to slidably receive a shank which has one end pivotally attached to the back support. An adjust

A wheel chair includes a back support pivotally attached to a base frame and having a handle and a hand grip pivotally attached to the handle, a housing is secured to the base frame and includes a chamber to slidably receive a shank which has one end pivotally attached to the back support. An adjustably anchoring device may be used to adjustably anchor the shank to the housing, and to adjustably secure the back support to the base frame to selected angular position. One or more coil springs are engaged onto the shank, and have an inner diameter smaller than an outer diameter of the shank, to allow the springs to be engaged and clamped onto the shank, and to be expanded and released from the shank by a barrel.

대표청구항 ▼

I claim: 1. A wheel chair comprising: a supporting base frame including at least one wheel attached thereto, and including a seat provided thereon for supporting users thereon, and including a back support pivotally attached to said base frame with a pivot axle, to allow said back support to be rot

I claim: 1. A wheel chair comprising: a supporting base frame including at least one wheel attached thereto, and including a seat provided thereon for supporting users thereon, and including a back support pivotally attached to said base frame with a pivot axle, to allow said back support to be rotated and adjusted relative to said base frame to a selected angular position, said back support including a handle extended therefrom, and a hand grip pivotally attached to said handle, a housing secured to said base frame and having a hollow chamber formed therein, a shank slidably received in said chamber of said housing, and including a first end pivotally attached to said back support with a pivot pin, to allow said shank to be pivoted relative to said back support, and means for adjustably anchoring said shank to said housing, and to adjustably secure said back support to said base frame to selected angular position, said adjustably anchoring means including a coil spring member engaged onto said shank, and having an inner diameter smaller than an outer diameter of said shank, to allow said spring member to be engaged and clamped onto said shank. 2. The wheel chair as claimed in claim 1, wherein said adjustably anchoring means includes a barrel received in said housing and having a flap extended therefrom, and having an anchor portion provided therein, said spring member includes a first end attached to said barrel, to allow said spring member to be expanded and released from said shank by said barrel when said barrel is rotated relative to said shank. 3. The wheel chair as claimed in claim 2, wherein a cable is coupled between said hand grip and said flap, to allow said flap and thus said barrel to be rotated relative to said shank against said spring member by said hand grip. 4. The wheel chair as claimed in claim 3, wherein said flap includes a hook extended therefrom and having a slot formed therein to slidably receive said cable, and a block is secured to said cable and engaged with said flap and anchored to said flap with said hook, to allow said barrel to be rotated relative to said shank against said spring member by said hand grip via said cable. 5. The wheel chair as claimed in claim 4, wherein said housing includes an extension extended outwardly therefrom and having an aperture formed therein, and an outer covering engaged with said extension of said housing, and said cable is slidably engaged in said outer covering and includes a first end secured to said hand grip, and a second end secured to said block. 6. The wheel chair as claimed in claim 2, wherein said housing includes a casing disposed in said hollow chamber thereof, and having a bore and a groove formed therein, and communicating with each other, said flap of said barrel is extended through said groove of said casing. 7. The wheel chair as claimed in claim 2, wherein said housing includes an opening formed therein, for receiving said flap of said barrel, and for allowing said flap of said barrel to be extended out of said housing. 8. The wheel chair as claimed in claim 7, wherein said housing includes a cover secured thereto, to enclose said opening thereof, and said cover includes a slit formed therein to receive said flap of said barrel. 9. The wheel chair as claimed in claim 1, wherein said housing includes a stop disposed therein and having at least one recess formed therein, and said housing includes at least one protrusion extended inwardly into said hollow chamber thereof, and engaged into said at least one recess of said stop, to anchor said stop in said housing. 10. The wheel chair as claimed in claim 1, wherein said shank includes a first end secured to a bracket, and said bracket is pivotally attached to said back support with said pivot pin. 11. A wheel chair comprising: a supporting base frame including at least one wheel attached thereto, and including a seat provided thereon for supporting users thereon, and including a back support pivotally attached to said base frame with a pivot axle, to allow said back support to be rotated and adjusted relative to said base frame to a selected angular position, said back support including a handle extended therefrom, and a hand grip pivotally attached to said handle, a housing secured to said base frame and having a hollow chamber formed therein, a shank slidably received in said chamber of said housing, and including a first end pivotally attached to said back support with a pivot pin, to allow said shank to be pivoted relative to said back support, and means for adjustably anchoring said shank to said housing, and to adjustably secure said back support to said base frame to selected angular position, and said housing including at least one cap attached to one end thereof for enclosing said hollow chamber of said housing, and having an orifice formed in said at least one cap for slidably receiving said shank. 12. The wheel chair as claimed in claim 11 further comprising a clamping ring engaged onto said at least one cap, to secure said at least one cap onto said housing. 13. The wheel chair as claimed in claim 11, wherein said shank includes an enlarged head provided on one end thereof and having an outer diameter greater than that of said orifice of said at least one cap, for preventing said enlarged head of said shank from being engaged into said housing.