Patent ID: 6837503

Claim:
A walker comprising: a front frame comprising two front upright members and a front cross brace coupled to both of the front upright members; a rear frame comprising two rear upright members and a rear cross brace coupled to both of the rear upright members; a seat coupled to at least one of the front frame and the rear frame; a detachable backrest coupled to the front frame; two backrest mounting assemblies, one on each front upright member, wherein each backrest mounting assembly comprises: a peg housing, wherein the housing has a receptacle and a lock pin hole, the receptacle of dimensions suitable to receive an attaching peg of the backrest; a lock pin having a retracted position removed from the lock pin hole but retained in the housing and an inserted position wherein a portion of the lock pin extends through the lock pin hole; a spring biasing the lock pin toward the inserted position; wherein the attaching peg is adapted to be retained in the housing when the lock pin is in the inserted position; wherein the backrest comprises two attaching pegs, each attaching peg comprising: a first portion having a distal end and a proximal end, the distal end being distal in relation to a center of the backrest, and the proximal end being proximal in relation to the distal end, wherein a section of the first portion is tapered so as to have a diameter that decreases toward the distal end of the first portion; a second portion, the second portion proximal to the first portion, wherein a section of the second portion has a diameter that is less than a diameter of a section of the first portion, the second portion defining a notch of dimensions suitable to house a portion of the lock pin; and a third portion, the third portion proximal to the second portion, wherein a section of the third portion has a diameter that is greater than the diameter of the section of the second portion.