초록 ▼

One embodiment of the invention relates to an adjustable cart including a upper platform with a front portion and a back portion, a lower platform with a front portion and a back portion, rolling members for movably supporting the lower platform, a first supporting member connected to the back porti

One embodiment of the invention relates to an adjustable cart including a upper platform with a front portion and a back portion, a lower platform with a front portion and a back portion, rolling members for movably supporting the lower platform, a first supporting member connected to the back portion of the lower platform, and a first rotational pivot structure connecting the first supporting member to the back portion of the upper platform to permit pivoting about a first pivot location. The upper platform is configured to rotate about the first rotational pivot structure from a first position substantially parallel to the lower platform to a second position substantially perpendicular to the lower platform during which the first pivot location moves away from the lower platform.

대표청구항 ▼

What is claimed is: 1. An adjustable cart comprising: a upper platform with a front portion and a back portion; a lower platform with a front portion and a back portion; rolling members for movably supporting the lower platform; a first supporting member connected to the back portion of the lower p

What is claimed is: 1. An adjustable cart comprising: a upper platform with a front portion and a back portion; a lower platform with a front portion and a back portion; rolling members for movably supporting the lower platform; a first supporting member connected to the back portion of the lower platform; and a first rotational pivot structure connecting the first supporting member to the back portion of the upper platform to permit pivoting about a first pivot location, wherein the upper platform is configured to rotate about the first rotational pivot structure from a first position substantially parallel to the lower platform to a second position substantially perpendicular to the lower platform during which the first pivot location moves away from the lower platform, wherein the first supporting member comprises an outer tube and an inner telescoping tube with the inner telescoping tube being connected to a portion of the upper platform, wherein the first rotational pivot structure is configured to raise the portion of the upper platform connected to the inner telescoping tube relative to the lower platform in response to rotation of the upper platform from the first position to the second position, and wherein the first rotational pivot structure is configured such that the rotation of the upper platform causes the inner telescoping tube connected to the portion of the upper platform to rise. 2. The adjustable cart according to claim 1, further comprising a second supporting member connected to the front portion of the upper platform and the front portion of the lower platform. 3. The adjustable cart according to claim 2, wherein the front portion of the upper platform is configured to slide down the second supporting member during a portion of the rotation of the upper platform from the first position toward the second position and to slide up the second supporting member during a subsequent portion of the rotation of the upper platform from the first position toward the second position. 4. The adjustable cart according to claim 3, wherein the second supporting member is configured to rotate about a second rotational pivot structure when the upper platform is rotated from the first position to the second position. 5. The adjustable cart according to claim 3, further comprising a sliding joint connecting the upper platform to the second supporting member. 6. The adjustable cart according to claim 5, wherein the sliding joint comprises: a body with a second rotational pivot structure such that the front portion of the upper platform is rotatable about the sliding joint; an aperture in the body into which the second supporting member is inserted such that the sliding joint is slidable along a longitudinal axis of the second supporting member; and a retractable protrusion that is configured to extend into and retract from the aperture in the body such that the sliding joint can be held in place along the longitudinal axis of the second supporting member. 7. The adjustable cart according to claim 1, wherein the first rotational pivot structure comprises brackets attached to the inner telescoping tube of the first supporting member. 8. The adjustable cart according to claim 1, further comprising a mechanism for locking the upper platform into the second position. 9. The adjustable cart according to claim 1, further comprising a second rotational pivot structure configured to permit the upper platform and the first supporting member to rotate about the second rotational pivot structure from the second position substantially perpendicular to the lower platform to a third position substantially parallel to the lower platform. 10. An adjustable cart comprising: a upper platform with a front portion and a back portion; a lower platform with a front portion and a back portion; rolling members for movably supporting the lower platform; a first supporting member connecting the back portions of the upper and lower platforms together via a first rotational pivot structure that pivots about a first pivot location; and a second supporting member connecting the front portions of the upper and lower platforms together via a second rotational pivot structure, wherein the upper platform is configured to rotate about the first rotational pivot structure from a first position substantially parallel to the lower platform to a second position substantially perpendicular to the lower platform during which the first pivot location moves away from the lower platform, the second rotational pivot structure slides on the second supporting member toward the lower platform, and the second supporting member rotates about a third rotational pivot structure. 11. The adjustable cart according to claim 10, wherein the second rotational pivot structure is connected to a sliding joint connecting the upper platform to the second supporting member. 12. The adjustable cart according to claim 11, wherein the sliding joint comprises: a body with an aperture in which the second supporting member is inserted such that the sliding joint is slidable down the second supporting member, and a retractable protrusion that is configured to extend into and retract from the aperture in the body such that the sliding joint can be held in place along a longitudinal axis of the second supporting member. 13. The adjustable cart according to claim 12, wherein the protrusion fits inside at least one additional aperture in the second supporting member such that the joint is held in place along the longitudinal axis of the second supporting member. 14. The adjustable cart according to claim 10, wherein the first rotational pivot structure is configured to move the first pivot location away from the lower platform to such a distance that only a protrusion from the front portion of the upper platform contacts a surface of the lower platform when the upper platform is being placed into the second position. 15. The adjustable cart according to claim 10, wherein the first supporting member comprises an outer tube and an inner telescoping tube, and wherein the first rotational pivot structure comprises brackets attached to the inner telescoping tube of the first supporting member. 16. The adjustable cart according to claim 10, further comprising a mechanism for locking the upper platform into the second position. 17. The adjustable cart according to claim 10, further comprising a fourth rotational pivot structure configured to permit the upper platform and first supporting member to rotate about the fourth rotational pivot structure from the second position substantially perpendicular to the lower platform to a third position substantially parallel to the lower platform. 18. An adjustable cart comprising: a lower platform; an upper platform; at least two rotatable supporting members supporting the upper platform and rotatable along a first rotational pivot structure, wherein each of the two rotatable supporting members has an aperture, wherein the two rotatable supporting members project at a predetermined angle from the lower platform at a first position to support the upper platform; and a spring loaded mechanism for locking the at least two rotatable supporting members into the first position, wherein the spring loaded mechanism comprises: a pedal rotatable along a second rotational pivot structure; a spring for biasing the pedal in a depressed position; at least two link mechanisms connected to the pedal; and a locking pin connected to each link mechanism for insertion into one of the apertures of a corresponding rotatable supporting member, wherein each locking pin is configured to be pulled out of the aperture of the corresponding rotatable supporting member when the pedal is moved from the depressed position to a pressed position such that the rotatable supporting members can pivot around the first rotational pivot structure. 19. The adjustable cart according to claim 18, wherein the upper platform has a front portion and a back portion, wherein a third rotational pivot structure connects the at least two rotatable supporting members to the back portion of the upper platform, wherein the at least two rotatable supporting members are connected to a back portion of the lower platform, wherein the upper platform is configured to rotate about the third rotational pivot structure from a position substantially parallel to the lower platform to a position substantially perpendicular to the lower platform. 20. The adjustable cart according to claim 19, further comprising a front supporting member connecting the front portion of the upper platform and a front portion of the lower platform together, and wherein the front portion of the upper platform is configured to slide down the front supporting member when the upper platform is rotated from the substantially parallel position toward the substantially perpendicular position. 21. The adjustable cart according to claim 20, further comprising a sliding joint connecting the upper platform to the front supporting member. 22. The adjustable cart according to claim 19, wherein each of the rotating supporting members comprises an outer tube and an inner telescoping tube, and wherein the third rotational pivot structure comprises brackets attached to the inner telescoping tube of each of the rotating supporting members. 23. The adjustable cart according to claim 19, wherein the spring loaded mechanism is configured for locking the upper platform into the position substantially perpendicular to the lower platform, and wherein the position substantially perpendicular to the lower platform is the first position. 24. The adjustable cart according to claim 18, wherein the first rotational pivot structure is configured to permit the at least two rotating supporting members to rotate about the first rotational pivot structure from the first position to a second position substantially parallel to the lower platform.