초록 ▼

A stand for supporting a machine includes a mounting support having legs, at least one wheel unit having a wheel holder connected to one leg by a pivotal shaft thereof and a caster or wheel connected to the wheel holder, an actuating member connected at a first pivotal location thereof to the mounti

A stand for supporting a machine includes a mounting support having legs, at least one wheel unit having a wheel holder connected to one leg by a pivotal shaft thereof and a caster or wheel connected to the wheel holder, an actuating member connected at a first pivotal location thereof to the mounting support and at least one link having an end pivotally connected to the wheel holder. The connection location of the wheel and the pivotal shaft are spaced. The connection location of the end of the link and the pivotal shaft are spaced. The other end of the link is pivotally connected to the actuating member. The connection location of the other end of the link and the first connection location are spaced. When the actuating member is pivoted, the wheel holder is pivoted by the link to move the wheel downward to engage the ground.

대표청구항 ▼

What is claimed is: 1. A stand for a machine, comprising: a mounting support for supporting the machine thereon, and having a plurality of legs; at least one wheel unit having a pivotal shaft and a wheel holder pivotally connected to one of the legs of the mounting support by the pivotal shaft and

What is claimed is: 1. A stand for a machine, comprising: a mounting support for supporting the machine thereon, and having a plurality of legs; at least one wheel unit having a pivotal shaft and a wheel holder pivotally connected to one of the legs of the mounting support by the pivotal shaft and a wheel rotatably connected to the wheel holder, wherein the connection location of the wheel and the location of the pivotal shaft of the wheel holder are spaced apart; an actuating member pivotally connected at a first pivotal location thereof to the mounting support; at least one link having a first end pivotally connected to the wheel holder of the wheel unit, wherein the connection location of the first end of the link and the location of the pivotal shaft of the wheel holder are spaced apart, and a second end pivotally connected to the actuating member, wherein the connection location of the second end of the link and the first pivotal location of the actuating member are spaced apart, such that when the actuating member is pivoted, the wheel holder is pivoted by the link in order to move the wheel downward for engaging a supporting surface, thereby lifting the leg off of the supporting surface; and a locking mechanism having a first rod member with a first end pivotally connected to the mounting support, and a second rod member with first and second opposite ends respectively pivotally connected to a second end of the first rod member and pivotally connected with the actuating member such that when the first rod member is pivoted relative to the mounting support, the actuating member is forced to pivot relative to the mounting support by the second rod member. 2. The stand according to claim 1, wherein the locking mechanism further comprises a positioning member having two opposite ends respectively connected to the first rod member and the second rod member. 3. The stand according to claim 2, wherein the positioning member is a hook. 4. The stand according to claim 2, wherein the positioning member is a spring. 5. The stand according to claim 2, wherein when the second end of the first rod member and the first end of the second rod member are stopped against each other, the pivotal joint between the first rod member and the second rod member is offset from an imaginary line passing through the two opposite ends of the positioning member. 6. The stand according to claim 1, wherein the actuating member comprises a first segment having two opposite ends respectively pivotally connected to two opposite lateral sides of the mounting support, and a second segment fastened to the first segment, wherein the longitudinal direction of the first segment is substantially perpendicular to the longitudinal direction of the second segment. 7. The stand according to claim 6, wherein the second segment has a foot pedal at one end thereof remote from the first segment. 8. The stand according to claim 1, wherein the connection location of the wheel is below the pivotal shaft of the wheel holder, and the connection location of the end of the link is above the pivotal shaft of the wheel holder. 9. A stand for a machine, comprising: a mounting support for supporting the machine thereon, the mounting support having a plurality of legs; two wheel units each having a wheel holder with a pivotal shaft and a wheel rotatably connected to the wheel holder wherein the connection location of the wheel and the location of the pivotal shaft of the wheel holder are spaced apart, wherein the two wheel holders of the two wheel units are respectively pivoted on the pivotal shafts thereof to be mounted to two adjacent legs of the mounting support; an actuating member pivotally connected at a first pivotal location thereof to the mounting support; two links each having a first end pivotally connected to the wheel holder of one of the two wheel units, wherein the connection location of the first end of the link and the location of the pivotal shaft of the wheel holder are spaced apart, and a second end pivotally connected to the actuating member, wherein the first pivotal location of the actuating member is located between the connection locations of the second ends of the links such that when the actuating member is pivoted, the two wheel holders are pivoted by the two links in order to move the two wheels downward for engaging a supporting surface, thereby lifting the legs off of the supporting surface; and a locking mechanism having a first rod member with a first end pivotally connected to the mounting support, and a second rod member with first and second opposite ends respectively pivotally connected to a second end of the first rod member and pivotally connected with the actuating member such that when the first rod member is pivoted relative to the mounting support, the actuating member is forced to pivot relative to the mounting support by the second rod member. 10. The stand according to claim 9, wherein the mounting support comprises a reinforcing member having two ends respectively pivotally connected to the two wheel holders with the two pivotal shafts of the two wheel holders.