Folding chair riser

Abstract

A set of extenders attach to chair legs, such as folding chair legs, to safely and easily increase the height of the chair. The extenders can be designed as blocks that attach to the chair legs and can provide two different height adjustment positions. The blocks do not restrict movement of the chair while providing the desired height for user comfort. The blocks can be designed to receive straight legs and can also be designed to receive horizontal beam legs. The blocks can be fixed to the chair legs with one or more set screws to provide a secure, safe, and convenient chair height adjustment. The extenders of the present invention eliminate the need for a user to sit on phone books or pillows to achieve a desired seating height.

What is claimed is: 
     
         1 . A chair riser apparatus comprising:
 a plurality of risers operable to receive front and rear legs of a chair; and   a set screw for securing the plurality of risers to the front and rear legs of the chair.   
     
     
         2 . The chair riser apparatus of  claim 1 , further comprising a leg placement hole formed in each of the plurality of risers, the leg placement hole receiving the front and rear legs of the chair to provide a first height adjustment of the chair. 
     
     
         3 . The chair riser apparatus of  claim 1 , further comprising a height adjustment dowel operable to be placed at the ends of the front and rear legs of the chair, between the plurality of risers and the front and rear legs of the chair to provide a second, higher height adjustment of the chair. 
     
     
         4 . The chair riser apparatus of  claim 3 , further comprising a height adjustment dowel storage hole formed in each of the plurality of risers, the height adjustment dowel storage hole operable to store the height adjustment dowel when not in use and the chair is supported at a first height adjustment. 
     
     
         5 . The chair riser apparatus of  claim 2 , further comprising a sleeve disposed in the leg placement hole. 
     
     
         6 . The chair riser apparatus of  claim 1 , wherein at least two of the plurality of risers are formed in a U-shape to receive a continuous beam of the chair. 
     
     
         7 . The chair riser apparatus of  claim 6 , further comprising a dowel placement hole formed in an interior base of the U-shaped risers for receiving an optional height adjustment dowel. 
     
     
         8 . A chair riser apparatus comprising:
 a pair of front leg risers and a pair of rear leg risers operable to receive front and rear legs of a chair;   a leg placement hole formed in each of the pairs of front and rear leg risers, the leg placement hole receiving the front and rear legs of the chair to provide a first height adjustment of the chair;   a set screw for securing the pairs of front and rear leg risers to the front and rear legs of the chair;   a height adjustment dowel operable to be placed at the ends of the front and rear legs of the chair, between the pairs of front and rear leg risers and the front and rear legs of the chair to provide a second, higher height adjustment of the chair; and   a height adjustment dowel storage hole formed in each of the pairs of front and rear leg risers, the height adjustment dowel storage hole operable to store the height adjustment dowel when not in use and the chair is supported at a first height adjustment.   
     
     
         9 . The chair riser apparatus of  claim 8 , further comprising a sleeve disposed in the leg placement hole. 
     
     
         10 . A chair riser apparatus comprising:
 a plurality of risers operable to receive front and rear legs of a chair, wherein at least two of the plurality of risers are formed in a U-shape to receive a continuous beam of the chair;   a set screw for securing the plurality of risers to the front and rear legs of the chair; and   a dowel placement hole formed in an interior base of the U-shaped risers for receiving an optional height adjustment dowel.