Patent ID: 7273118

Claim:
An electric wheelchair frame comprising a seat brace, a pair of connection rods, a pair of front suspension brackets, a pair of rear suspension brackets, and a pair of resilient members; either side of the seat brace including a front section and a rear section; each connection rod including an upper end, a middle section, and a lower end; each front suspension bracket including a front wheel, a front end, a middle section, and a rear end; each rear suspension bracket including a rear wheel, a main wheel, a front end, a front section, a middle section and a rear end; each resilient member including two ends; whereby the front section of either side of the seat brace being pivotally connected to the middle section of the front suspension bracket, the rear section of either side of the seat brace being pivotally connected to the middle section of the rear suspension bracket, the front end of the front suspension bracket being pivotally connected with the front wheel, the rear end of the front suspension bracket being pivotally connected to the lower end of the connection rod, the middle section of the connection rod being pivotally connected with the front end of the rear suspension bracket, the upper end of the connection rod being pivotally connected with one end of the resilient member, the rear end of the rear suspension bracket being pivotally connected with the rear wheel, a lower part of the front section of the rear suspension bracket being pivotally connected with the main wheel, an upper part of the front section of the rear suspension bracket being pivotally connected with the other end of the resilient member.