Patent ID: 11912328
Assignee: WONDERLAND SWITZERLAND AG
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A vehicle frame, comprising:
a first tube;
a second tube, two opposite ends of the second tube being respectively pivoted to the first tube and one wheel of the vehicle frame;
a third tube, two opposite ends of the third tube being respectively pivoted to the second tube and another wheel of the vehicle frame; and
a foldable unit comprising a fourth tube, an end of the fourth tube being pivoted to the first tube, and the other end of the fourth tube being directly connected to a middle area of the third tube in a pivotable manner, a linkage mechanism being formed by four-bar connection between the first tube, the second tube, the third tube and the fourth tube, rotation of the first tube moving the second tube and the third tube close to each other or away from each other via link of the fourth tube for folding or unfolding the vehicle frame.