Patent ID: 6625846
Filing Date: 2003-09-30
Classification: B25J,B60B,B62D,Y10T

Abstract:
A caster comprising:a plate adapted to touch the ground, said plate having a first upward curved end and a second upward curved end, said plate having an opening between the first upward carved end and the second upward curved end; a wheel and a support, said wheel being disposed in the opening, said support rotatably supporting the wheel, said support having a shaft adapted to be connected to a device to be transferred; an arch member having a top portion, a first end, and a second end, said top portion being movably supported by the support at a position above the wheel wherein an angle of the support with respect to the plate is changeable as the support moves along the arch member, said first end being located between the first upward curved end and the opening, said second end being located between the second upward curved end and the opening; and a first socket and a second socket provided on the plate, said first socket receiving the first end of the arch member, said second socket receiving the second end of the arch member, wherein the first socket, the opening, and the second socket are aligned, and the wheel touches the ground through the opening, wherein (i) when the first upward curved end is detached from the ground, the wheel and the second upward curved end touch the ground, (ii) when the second upward curved end is detached from the ground, the wheel and the first upward curved end touch the ground, and (iii) when the first upward curved end and the second upward curved end touch the ground, the wheel touches the ground.