Patent ID: 9351888
Filing Date: 2016-05-31
CPC Classification: A61G,B60G

Claim Text:
1. A front suspension system for an electric wheelchair being assembled onto a frame of the electric wheelchair, the electric wheelchair including a seating disposed on the frame, two front wheels and two rear wheels disposed at a front end and a rear end of the frame, respectively, an assembly frame connected to each of two sides of the frame between the front and rear ends of the frame via a pivot, a drive unit being fixed to each of the assembling frames and located at one side of the corresponding pivot, and a drive wheel coupled to each of the drive units, each of the front wheels being connected to the frame via a front suspension system, the front suspension system comprising a front pivot shaft with one end fixed to the frame, and a front wheel retainer with one end pivoted to another end of the front pivot shaft, the front wheel retainer having another end fixed to a corresponding one of the front wheels, the front suspension system being characterized in that: an abutting member is on the frame; a surface of the front wheel retainer faces toward the frame and is formed with a driving portion; an elasticity resistance member is disposed between the frame and the front wheels retainer, the elasticity resistance member is sequentially formed with a driving section, an elasticity resistance section and a stop section, the elasticity resistance section is a spiral structure, and the driving section and the stop section are connected to two ends of the elasticity resistance section, respectively, and extend in two different directions, the elasticity resistance member is sleeved onto the front pivot shaft and located between the frame and the front wheel retainer, the driving section of the elasticity resistance member is connected to the driving portion of the front wheel retainer, and the stop section is stopped against the abutting member, the stop section includes an extending portion and a force applying portion, a direction along which the extending portion extends is defined as a first direction, and a direction perpendicular to the first direction is defined as a second direction, the force applying force extends in the second direction, and the force applying portion of the stop section is stopped against the abutting member; and a front shock absorber has one end pivoted to the front wheel retainer, and has another end pivoted to another side of the pivot of the assembling frame, an axis of the front shock absorber is located at angle ranging from 0-10 degrees with respect to the first direction.