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A gate-and-seat assembly for a shopping cart includes a gate, a backrest, and a seat. The gate has a first end pivotally mountable to a rear portion of a shopping cart. The backrest includes a back support and a pair of legs with the back support defining a slot. The pair of legs extends from the ba

A gate-and-seat assembly for a shopping cart includes a gate, a backrest, and a seat. The gate has a first end pivotally mountable to a rear portion of a shopping cart. The backrest includes a back support and a pair of legs with the back support defining a slot. The pair of legs extends from the back support and is pivotally mounted to a lower portion of the gate to enable pivotal movement of the backrest relative to the gate. The seat is pivotally mounted to the gate via at least one pivot mechanism and slidably extends through the slot of the back support. The seat includes a pair of ears extending laterally outward from the seat in opposite directions with each respective ear being releasably engageable relative to a rear surface of the back support of the backrest. The entire gate-and-seat assembly is made entirely from a plastic material. The seat is pivotally movable from a seating position to a collapsed position upon pivotal movement of the backrest relative to and toward the gate wherein the seat slidably moves through the slot of the back support and pivots downward toward the gate until both the seat and the back support are collapsed against the gate with the back support being spaced vertically above the seat.

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What is claimed is: 1. A gate-and-seat assembly for a shopping cart comprising: a gate having a first end pivotally mountable adjacent to a rear portion of a shopping cart; a backrest including: a back support defining a slot; and a pair of legs extending from the back support and pivotally mounted

What is claimed is: 1. A gate-and-seat assembly for a shopping cart comprising: a gate having a first end pivotally mountable adjacent to a rear portion of a shopping cart; a backrest including: a back support defining a slot; and a pair of legs extending from the back support and pivotally mounted to a lower portion of the gate to enable pivotal movement of the backrest relative to the gate; and a seat pivotally mounted to the gate via at least one pivot mechanism and slidably extendable through the slot of the back support, the seat including a pair of ears extending laterally outward from the seat in opposite directions with each respective ear being releasably engageable relative to a rear contact portion of the back support of the backrest, wherein the entire gate-and-seat assembly is made from a plastic material, and wherein the seat is pivotally movable from a seating position to a collapsed position upon pivotal movement of the backrest in a first rotational direction toward the gate with the seat slidably moving through the slot of the back support and pivoting in a second rotational direction downward toward the gate until both the seat and the back support are collapsed against the gate, wherein the first rotational direction and the second rotational direction are generally opposite one another. 2. The gate-and-seat assembly of claim 1 wherein the seat is pivotally movable from the collapsed position to the seating position upon pivotal movement of the backrest away from the gate with the seat slidably moving through the slot of the back support and pivoting upward away from the gate until the seat is in a generally horizontal orientation with the ears of the seat in releasable contact against the rear contact portion of the back support to maintain, in combination with gravitational forces, the seat in the seating position. 3. The gate-and-seat assembly of claim 1 wherein the seat includes a pair of side edges with each respective ear extending outward from the respective side edges of the seat, and the legs of the backrest laterally spaced from each other by a width generally corresponding to a width of the seat between the side edges of the seat. 4. The gate-and-seat assembly of claim 1 wherein the at least one pivot mechanism comprises a first sleeve array of the gate, at least one sleeve of the seat, and a pin extending through the first sleeve array of the gate and the at least one sleeve of the seat to maintain the first sleeve array of the gate and the at least one sleeve of the seat in an interleaved configuration. 5. The gate-and-seat assembly of claim 4 wherein the pin is made of a plastic material and comprises a shaft extending between a first end and a second end with the first end defining a flange and the second end defining a pair of flexible, resilient fingers separated by a slot and defining a beveled flange that extends circumferentially about the fingers. 6. The gate-and-seat assembly of claim 4 wherein the pin has a length that generally corresponds to a combined length of the sleeve array of the gate and the at least one sleeve of the seat. 7. The gate-and-seat assembly of claim 1 wherein the gate comprises a pair of leg openings located vertically above a location of the at least one pivot mechanism and a divider extending vertically between the leg openings, the divider including an angled portion configured to protrude away from an upper portion of the gate. 8. An all-plastic shopping cart comprising: a basket; a wheeled base supporting the basket; a handle spaced from and supported by the basket; and a gate-and-seat assembly including: a gate having an upper portion and a first end pivotally mountable adjacent to a rear portion of the shopping cart; a backrest including: a back support defining a slot; and a pair of legs extending from the back support and pivotally mounted to a lower portion of the gate to enable pivotal movement of the backrest relative to the gate; and a seat pivotally mounted to the gate via at least one pivot mechanism and slidably extendable through the slot of the back support, the seat including a pair of ears extending laterally outward from the seat in opposite directions with each respective ear being releasably engageable relative to a rear contact portion of the back support of the backrest, wherein the entire gate-and-seat assembly is made from a plastic material, and wherein the seat is pivotally movable from a seating position to a collapsed position upon pivotal movement of the backrest toward the gate with the seat slidably moving through the slot of the back support and pivoting downward toward the gate until both the seat and the back support are collapsed against the gate, the back support being collapsed against the upper portion of the gate. 9. The shopping cart of claim 8 wherein the seat is pivotally movable from the collapsed position to the seating position upon pivotal movement of the backrest away from the gate with the seat slidably moving through the slot of the back support and pivoting upward away from the gate until the seat is in a generally horizontal orientation with the ears of the seat in releasable contact against the rear contact portion of the back support to maintain, in combination with gravitational forces, the seat in the seating position. 10. The shopping cart of claim 9 wherein the seat includes a pair of side edges with each respective ear extending outward from the respective side edges of the seat, and the legs of the backrest laterally spaced from each other by a width generally corresponding to a width of the seat between the side edges of the seat. 11. The shopping cart of claim 9 wherein the at least one pivot mechanism comprises a first sleeve array of the gate, at least one sleeve of the seat, and a pin extending through the first sleeve array of the gate and the at least one sleeve of the seat to maintain the first sleeve array of the gate and the at least one sleeve of the seat in an interleaved configuration. 12. The shopping cart of claim 9 wherein the gate comprises a pair of leg openings located vertically above a location of the at least one pivot mechanism and a divider extending vertically between the leg openings, the divider including an angled portion configured to protrude away from an upper portion of the gate. 13. The shopping cart of claim 12 wherein the seat includes a concave depression in a top surface of the seat with the concave depression sized and shaped to generally mate relative to the divider of the gate. 14. A method of nesting an all-plastic shopping cart comprising: providing a first shopping cart including a rear gate pivotally movable upward through a basket of the first shopping cart into a nestable position for nestably receiving a second shopping cart within the basket of the first shopping cart; arranging a gate-and-seat assembly of the first shopping cart for pivotal movement between an open, seating position in which a seat is in a generally horizontal position and a collapsed, storage position in which a back support is pivoted in a first direction with respect to a gate to rest against the gate and the seat is pivoted in a second direction with respect to the gate that is generally opposite to the first direction to rest against the gate in a position vertically below the back support; and forcibly nesting the second shopping cart into the first shopping cart with the gate-and-seat assembly in the collapsed, storage position. 15. The method of claim 14 wherein arranging the gate-and-seat assembly comprises: arranging the back support to include a slot extending laterally across the back support and having a width generally corresponding to a width of the seat. 16. The method of claim 15 and further comprising: removing the second shopping cart from a nested relationship with the first shopping cart to enable the gate-and-seat assembly of the first shopping cart to pivot downward into a generally vertical position and to pivotally move the back support of the gate-and-seat assembly away from the gate to cause the seat to slidably move through the slot of the back support and into the seating position in which the seat is supported by and within the slot of the back support and in which releasable engagement between a rear portion of the back support and at least one ear of the seat prevents further pivotal movement of the back support away from the gate. 17. The method of claim 16 wherein arranging the back support comprises: arranging a pair of legs that extend downwardly and outwardly from the back support, with each respective leg being pivotally mounted adjacent and relative to a lower portion of the gate and the legs being laterally spaced apart from each other by a width that generally corresponds to a width of the seat.