Adjustable cart

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.

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.