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A stroller includes a frame assembly with a pedal-mounting rod, on which a brake pedal is mounted rotatably. When the brake pedal is turned downward, a coupling mechanism activates two resilient elements to bias two brake pins to project from two pin holes in two mounting seats. At this time, in cas

A stroller includes a frame assembly with a pedal-mounting rod, on which a brake pedal is mounted rotatably. When the brake pedal is turned downward, a coupling mechanism activates two resilient elements to bias two brake pins to project from two pin holes in two mounting seats. At this time, in case the brake pins are aligned with two of a plurality of brake holes in two rear wheels, they are biased into the two brake holes. In case the brake pins are deflected from all of the brake holes, they are biased to press against the surfaces of the rear wheels. Under such conditions, the rear wheels are rotated slowly by pushing the stroller so as to permit the brake pins to be biased into two of the brake holes.

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1. A stroller comprising: a frame assembly including a horizontal pedal-mounting rod; a brake pedal having a pivot portion that is disposed rotatably on said pedal-mounting rod, a foot-engaging portion that extends rearward from said pivot portion, and a control portion that extends forward fro

1. A stroller comprising: a frame assembly including a horizontal pedal-mounting rod; a brake pedal having a pivot portion that is disposed rotatably on said pedal-mounting rod, a foot-engaging portion that extends rearward from said pivot portion, and a control portion that extends forward from said pivot portion; a coupling mechanism including a mounting rod that extends through said control portion, and a pair of push rods that are disposed movably on an intermediate portion of said mounting rod, that are located on two sides of said brake pedal, and that are capable of moving outward away from each other when said brake pedal is turned downward, each of said push rods having a coupling end that is distal to said brake pedal; two rear wheels, each of which includes a plurality of holes that are arranged along a circle, and an axle that is disposed at a center of said circle; and two brake mechanisms, each of which includes a mounting seat that is mounted to a respective end of said mounting rod and that is formed with a pin hole, a brake pin that is disposed movably within said pin hole in said mounting seat, and a resilient element, said push rods being connected respectively and movably to said mounting seats, said axles of said rear wheels being journalled respectively on said mounting seats, each of said resilient elements having a spring force-storing portion that is mounted to a respective one of said mounting seats, a rod-engaging portion that engages said coupling end of the respective one of said push rods so as to be moved relative to the respective one of said mounting seats by the respective one of said push rods, and a pin-driving portion that moves a respective one of said brake pins to engage one of said holes in a respective one of said rear wheels when said brake pedal is turned downward, thereby preventing rotation of the respective one of said rear wheels relative to said mounting seats. 2. The stroller as claimed in claim 1, wherein each of said mounting seats is elongated, and includes a transverse front rod hole, through which a respective one of said ends of said mounting rod extends, and a transverse rear axle hole, within which a respective one of said axles is journalled.3. The stroller as claimed in claim 1, wherein each of said mounting seats has a front portion that is formed with a transverse front slide slot, and a rear portion that is formed with a transverse rear slide slot, each of said front and rear slide slots having two closed ends, said coupling end of each of said push rods including a fixed vertical front positioning pin that extends through a respective one of said front slide slots, each of said rear slide slots being located under and being in communication with said pin hole, each of said brake pins having a vertical hole, each of said brake mechanisms further including a vertical rear positioning pin that extends through a respective one of said rear slide slots and into said vertical hole in a respective one of said brake pins and that contacts said pin-driving portion of a respective one of said resilient elements so as to move outward when said brake pedal is turned downward to move a respective one of said push rods outward, thereby engaging a respective one of said brake pins with said one of said holes in a respective one of said rear wheels.4. The stroller as claimed in claim 1, wherein each of said mounting seats further includes a positioning post that is fixed thereon, said spring force-storing portion of each of said resilient elements being coiled, and being sleeved on a respective one of said posts.5. The stroller as claimed in claim 1, wherein said frame assembly further includes an aligned pair of inclined left and right lower rods, a front wheel unit that is disposed between said left and right lower rods, a handle unit that is connected to upper ends of said lower rods, and two generally vertical rear supporting rods that are connected pivotally t o said handle unit at upper ends thereof and that are connected respectively and fixedly to two opposite ends of said pedal-mounting rod at lower ends of said rear supporting rods.6. The stroller as claimed in claim 1, wherein said coupling mechanism further includes two springs, which bias said push rods toward said brake pedal.7. The stroller as claimed in claim 6, wherein said coupling mechanism further includes two limiting seats that are fixed respectively to said push rods and that are adjacent to said brake pedal, each of said limiting seats having a sleeving portion that is sleeved fixedly on a respective one of said push rods, and a rearwardly and outwardly inclined limiting plate that extends integrally from said sleeving portion, said control portion of said brake pedal having an upper portion that engages said limiting plates at two opposite sides thereof, a lower portion, and a width along a longitudinal direction of said push rods, which decreases gradually and downwardly, downward turning of said brake pedal resulting in rotation of said control portion about said pedal-mounting rod so as to engage said lower portion with said limiting plates, thereby moving said push rods outwardly.8. The stroller as claimed in claim 7, wherein each of said limiting plates is formed with a stop projection, which engages a respective one of the opposite sides of said control portion when said brake pedal is turned downward, thereby preventing further rotation of said brake pedal about said pedal-mounting rod.