Patent ID: 9637149
Date: 2017-05-02
CPC Classifications: B62B

Claim:
1. A cart comprising: a first frame having two side tubes, each of the two side tubes having a first wheel pivotably connected to an outside thereof; a second frame pivotably connected to the first frame and having a transverse tube, two second wheels connected to the transverse tube, and a locking device slidably connected to the first frame and being positioned at one of a first position and a second position, the locking device having a seat, a pull rod, two arms and two positioning tubes, the seat slidably connected between the two side tubes, the two arms each having a first end pivotably connected to a first end of the pull rod, and the two arms each having a second end pivotably connected to a first end of the positioning tube corresponding thereto, a spring mounted to the pull rod, a second end of the pull rod extending through the seat, the spring being biased between a part at the first end of the pull rod and an inside of the seat, a second end of each of the positioning tubes being selectively engaged with the side tube corresponding thereto to set the first position and the second position, when the locking device is set at the first position, the second frame is pivoted to a position substantially parallel to the first frame and the first wheels support the cart, the second wheels are located above the first wheels and do not touch ground, when the locking device is set at the second position, the second frame is pivoted to a position substantially perpendicular to the first frame, and the first and second wheels support the cart.