legs 22 an axle pin 28 is fitted through the axle 16 and is engaged within the wheel bearing sheath 28 in order for the axle to rotate as the wheel rotates a washer 30 and a cap 32 is mounted on the ends of each axle 16 to keep the wheel 14 aligned with the tubular yoke legs 22 to keep the axle 16 and wheel 14 in place each wheel 14 is surrounded with rubber 34 around the outside circumference of the wheel a brake structure is mounted within the tubular yoke legs 22 and comprises compression springs 36 38 mounted above and below the axle 16 a pin 40 is attached through each tubular yoke leg 22 above the axle 16 to keep the upper compression spring 36 in place a tubular yoke leg closure 40 is fixed on the bottom of each tubular yoke leg 22 and keeps the lower compression spring 38 in place a metal plate 42 is fixed on one end of each compression spring closest to the axle 16 of the wheel 14 and the metal plate 42 remains in constant contact with the axle each spring 36 38 and metal plate 42 exerts a force against the axle 16 to resist and inhibit rotation of the axle and the wheels 14 supported thereon the spring force is insufficient to curb.