초록 ▼

Described is a collapsible cart that provides substantial stability when operated. A pair of enlarged wheels allow an operator to lift one end of the cart to traverse rough surfaces as needed. Enlarged wheels are mounted outside an overhead profile of the collapsible cart thereby providing lateral a

Described is a collapsible cart that provides substantial stability when operated. A pair of enlarged wheels allow an operator to lift one end of the cart to traverse rough surfaces as needed. Enlarged wheels are mounted outside an overhead profile of the collapsible cart thereby providing lateral and other stability not previously possible. A first shelf, tray, bucket or working surface may be collapsed to contact or mate with a second such shelf to create an easily transportable or storable collapsed structure. A telescoping handle allows a collapsed cart to serve as a hand dolly.

대표청구항 ▼

1. A collapsible cart comprising: a first pair of wheels;a second pair of wheels, wherein each of the first pair of wheels is larger in diameter than each of the second pair of wheels;at least two legs;a first tray having an outer profile, wherein each of the first pair of wheels is mounted outside

1. A collapsible cart comprising: a first pair of wheels;a second pair of wheels, wherein each of the first pair of wheels is larger in diameter than each of the second pair of wheels;at least two legs;a first tray having an outer profile, wherein each of the first pair of wheels is mounted outside the outer profile of the first tray;a second tray with an outer profile, the second tray configured to lay above the first tray by engaging with and being supported by each of the at least two legs;a first locking mechanism, wherein the first locking mechanism includes a leg locking arm that releasably engages with at least one of the legs for operation of the first locking mechanism, and wherein the first locking mechanism includes a tray locking arm that releasably engages with at least one of the first tray and the second tray, and wherein the first locking mechanism includes a foot pedal to facilitate operation of the first locking mechanism, and wherein the foot pedal is at least partially of a first color; anda second locking mechanism, wherein the second locking mechanism includes a leg locking arm that releasably engages with at least one of the legs for operation of the second locking mechanism, and wherein the second locking mechanism includes a foot pedal for facilitating operation of the second locking mechanism, wherein said second foot pedal is at least partially of a second color. 2. The collapsible cart of claim 1, wherein either the first color or the second color is of a red hue. 3. The collapsible cart of claim 1, wherein a first leg fits within the outer profile of the first tray and outer profile of the second tray. 4. The collapsible cart of claim 1, wherein two of the at least two legs fit within the outer profile of the first tray or the outer profile of the second tray. 5. The collapsible cart of claim 1, wherein at least one end of each leg includes a portion that is slidable in and along the slot. 6. The collapsible cart of claim 5, wherein each leg is reversibly lockable in one of a plurality of positions. 7. The collapsible cart of claim 1, wherein the collapsible cart further comprises: a support arm for each respective leg. 8. The collapsible cart of claim 1, wherein the collapsible cart further comprises at least two slots and four legs. 9. The collapsible cart of claim 1, wherein each of the second pair of wheels is extendable outside the outer profile of the first tray. 10. The collapsible cart of claim 1, wherein the collapsible cart further comprises: a slot formed along either the first tray or the second tray, the slot running substantially parallel with either the first tray or the second tray, and wherein the slot engages with one or more portions of a respective end of one or more of the at least two legs so as to facilitate operation of the collapsible cart. 11. The collapsible cart of claim 10, wherein an opposite end of one or more of the at least two legs is mounted in a rotatable connection in a fixed location of a respective first tray or second tray. 12. The collapsible cart of claim 10, wherein the slot includes depressions which define two or more extended and stable positions for the first tray relative to be held at respective distances from the second tray, the extended positions being characterized by different distances between a plane of the first tray and a plane of the second tray. 13. The collapsible cart of claim 1, wherein at least one of the at least two legs includes a hinge at which a first segment of the leg is rotatable with respect to a second segment of the leg. 14. The collapsible cart of claim 1, wherein the collapsible cart further comprises a handle mounted to either the first tray or the second tray. 15. The collapsible cart of claim 14, wherein the handle mounted to either the first tray or second tray is extendable substantially along a plane of either the first tray or the second tray when the collapsible cart is in a collapsed state, and wherein the collapsible cart further comprises a handcart plate formed in or mounted to an edge of the collapsible cart opposite the handle, and wherein the handcart plate extends substantially perpendicular to a plane defining the first tray or the second tray. 16. A collapsible cart comprising: a first pair of wheels;a second pair of wheels, wherein each of the first pair of wheels is larger in diameter than each of the second pair of wheels;a first shelf, wherein the first shelf includes a profile, wherein each of the first pair of wheels is mounted outside the outer profile of the first shelf;legs, wherein each leg is extendable to at least one extended position;a second shelf configurable to lie above the first shelf;a first locking mechanism, wherein the first locking mechanism includes a leg locking portion that is engagable with one or more of the legs, and a shelf locking portion that is engagable with the first shelf, with the second shelf, or with the first shelf and second shelf, and wherein the first locking mechanism includes a foot pedal at least partially of a first color, and wherein the foot pedal is configured to facilitate operation of the first locking mechanism; anda second locking mechanism, wherein the second locking mechanism includes a leg locking portion that is configured to engage at least one of the legs, and wherein the second locking mechanism includes a foot pedal, and wherein the foot pedal of the second locking mechanism is at least partially of a second color distinct from the first color of the foot pedal of the first locking mechanism. 17. The collapsible cart of claim 16, wherein either the first shelf or second shelf includes a slot formed with a material, and wherein the slot runs substantially parallel with either the first shelf or the second shelf, and wherein the slot facilitates collapsing and extending of the legs. 18. The collapsible cart of claim 17, and wherein the material forming the slot is a same material used to form either the first shelf or the second shelf. 19. The collapsible cart of claim 16, wherein the collapsible cart further comprises a rail that is extendible along a direction in a plane defining either the first shelf or the second shelf. 20. The collapsible cart of claim 16, wherein the first shelf or the second shelf is formed so as to be able to at least partially nest inside the profile of the other shelf when the collapsible cart is in a collapsed state.