Utility cart

A collapsible cart, comprising:

• an upper frame;
• a lower frame;
• and
• a plurality of collapsible legs attached to and supporting the upper frame and the lower frame, wherein each collapsible leg comprises:
• an upper member pivotably connected to the upper frame;
• a lower member pivotably connected to the lower frame, wherein the upper member and the lower member are pivotably connected to each other such that the upper lower and the lower member can be folded relative to each other to collapse the leg;
• and
• a support mechanism configured to hold the upper member and the lower member in an erect configuration, wherein the support mechanism comprises:
• a locking pole extending through the upper member and the lower member to hold the upper member and the lower member in an erect configuration, wherein the locking pole comprises:
• a lever portion extending laterally out of the upper member;
• a locking portion extending from the lever portion and into the lower member;
• and
• a pin;
• an internal support brace attached to the upper member, wherein the support portion of the locking pole is received through a first side of the internal support brace and a second side of the internal support brace, and wherein the pin is positioned between and bound by the first side and the second side of the internal support brace;
• and
• a spring configured to bias the locking pole into a locking position, wherein the entire length of the spring surrounds the locking portion between the first side and the second side of the internal support brace, wherein the locking pole is movable from the locking position into an unlocking position to compress the spring against the internal support brace with the pin and move the locking portion out of locking engagement with the lower member so that the upper member and the lower member can be collapsed, and wherein the spring is confined entirely within the internal support brace.

A foldable cart, comprising:

• an upper frame;
• a lower frame;
• and
• a plurality of legs attached to and supporting the upper frame and the lower frame, wherein each leg is configured to be folded into a folded configuration from an erect configuration, and wherein each leg comprises:
• a first member pivotably attached to the upper frame;
• a second member pivotably attached to the lower frame;
• and
• a lock configured to hold the leg in the erect configuration, wherein the lock comprises:
• a lock bar extending through the first member and the second member, wherein the lock bar is movable between a locking position and an unlocking position;
• an internal support brace attached to the first member, wherein the lock bar extends through the internal support brace;
• and
• a spring configured to bias the lock bar into the locking position to hold the leg in the erect configuration, wherein the lock bar is spring-loaded against the internal support brace, wherein the entire length of the spring surrounds the lock bar between a first side of the internal support brace and a second side of the internal support brace, wherein the lock bar is movable into the unlocking position to compress the spring against the internal support brace and move the lock bar out of locking engagement with the second member so that the leg can be folded, and wherein the spring is confined entirely within the internal support brace.