A cart includes a first frame having two side tubes and each of the two side tubes has a first wheel connected thereto. A second frame is pivotably connected to the first frame and has a transverse tube. Two second wheels are connected to the transverse tube. A locking device is slidably connected t
A cart includes a first frame having two side tubes and each of the two side tubes has a first wheel connected thereto. A second frame is pivotably connected to the first frame and has a transverse tube. Two second wheels are connected to the transverse tube. A locking device is slidably connected to the first frame so as to be positioned at a first position or a 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. When the locking device is set at the second position, the second frame is pivoted to a position substantially perpendicular to the first frame. The first and second wheels support the cart.
대표청구항▼
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, anda locking de
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, anda 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. 2. The cart as claimed in claim 1, wherein the locking device has two links and two ends of each link are respectively and pivotably connected to the seat and the second frame. 3. The cart as claimed in claim 2, wherein the seat has two passages defined in two ends thereof, the two side tubes movably extend through the two passages respectively, the seat has a room to accommodate the pull rod, the arms, the positioning tubes and the spring, a cover is connected to the seat to close the room, the seat has two notches defined in a top thereof, each link has one end thereof engaged with the notch corresponding thereto. 4. The cart as claimed in claim 2, wherein the second frame has two pivotal tubes and two folding tubes which are pivotably connected to the pivotal tubes so that the folding tubes are pivoted relative to the pivotal tubes. 5. The cart as claimed in claim 4, wherein the second frame has two sleeves slidably connected thereto, when the sleeves move to connection portions between the two pivotal tubes and the two folding tubes, the folding tubes cannot be pivoted relative to the pivotal tubes, when the sleeves move to the two folding tubes, the folding tubes are pivoted relative to the pivotal tubes. 6. The cart as claimed in claim 1, wherein the second end of the pull rod that extends through the seat has a knob. 7. The cart as claimed in claim 1, wherein the side tubes each have a first hole and a second hole, the second end of each of the positioning tubes is selectively engaged with the first hole corresponding thereto to set the first position, the second end of each of the positioning tubes is selectively engaged with the second hole corresponding thereto to set the second position.
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이 특허에 인용된 특허 (27)
Wilhelm Paul K. (c/o Clipper Products ; P.O. Box 30388 Cincinnati OH 45230), Article carrying cart.
Blake, Richard R.; Russell, Jeffrey T.; Jones, Charles L.; Gray, Paul J.; Fjelstul, Jeffrey W.; Hinrichs, Steven P.; Lundy, Richard T.; Wu, Henry H., Mobile appliance lift tool.
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