Portable folding chair with adjustable legs

Abstract

A folding quad-style chair has a folding frame including four legs each having a leg tube, and a fabric seating section attached to the frame. An extension is telescopically extendable from each leg tube. A locking device is provided with each extension for releasably locking each extension into a fixed position. The locking device may be designed as a plurality of spaced apart holes and with the locking device including a spring urging a locking pin into one of the holes. A foot plate may be pivotally attached to a lower end of each extension. Since the length of each leg can be individually adjusted, the chair may be configured to provide a level seating surface even on a hillside, incline, or other sloped or irregular surface. All four legs may be fully extended to provide an elevated seating surface.

1 . A folding chair, comprising:
 a folding frame including four leg tubes;   fabric including a seating section attached to the frame;   an extension telescopically extendable from each leg tube; and   a locking device associated with each extension for releasably locking each extension into a fixed position.   
     
     
         2 . The chair of  claim 1  further comprising a foot plate pivotally attached to a lower end of each extension. 
     
     
         3 . The chair of  claim 1  each extension comprising a plurality of spaced apart holes and with the locking device including a spring urging a locking pin into one of the holes. 
     
     
         4 . The chair of  claim 1  with each extension having a non-round cross sectional shape. 
     
     
         5 . The chair of  claim 4  further including with lower end of each leg tube extending into an upper opening of a fitting, and with the fitting having a lower opening with a shape substantially matching the shape of the extension. 
     
     
         6 . The chair of  claim 1  with the extension having a length between 40% and 95% of the length of the leg tube. 
     
     
         7 . The chair of  claim 4  with the fitting further comprising first and second sets of clevis plates, a first cross tube pin extending between the first set of clevis plates to pivotally attach a lower end of a first cross tube to the fitting, and a second cross tube pin extending between the second set of clevis plates to pivotally attach a second cross tube to the fitting. 
     
     
         8 . The chair of  claim 1  with the extension having a D-shaped cross section. 
     
     
         9 . A folding chair, comprising:
 a folding frame having four legs, with each leg including a leg tube;   fabric including a seating section attached to the frame;   an extension telescopically extendable into and out of each leg tube;   a fitting rigidly attached to a lower end of each leg tube and having a lower opening with a shape substantially matching the shape of the extension;   a foot plate pivotally attached to a lower end of each extension; and   a locking device on each fitting, with each extension locked in a fixed position when the locking device is in a lock position, and with each extension telescopically movable into or out of the leg tube when the locking device is in a release position.   
     
     
         10 . The chair of  claim 9  with each extension having a non-round cross section and a plurality of spaced apart holes, and with the locking device comprising a spring-biased pin insertable into one of the spaced apart holes.