Abstract: A built-in toothpaste type toothbrush structure includes toothbrush casing, toothpaste inner tube, knob switch, toothpaste storage handle and pushing structure. The toothbrush casing includes a toothbrush head, an accommodating space, and an outlet and a socketing portion. The toothbrush casing is sheathed on the toothpaste inner tube and has a toothpaste channel inside, and the toothpaste storage handle is connected integrally with the toothpaste inner tube for storing toothpaste, and the pushing structure is installed in the toothpaste storage handle to push the toothpaste to the toothbrush head. Therefore, the knob switch can control the communication between the toothpaste inner tube and the toothbrush casing to avoid contaminating the toothpaste stored in the toothpaste inner tube, so that home and office users or students can carry and use the toothbrush for dental cleaning and oral hygiene conveniently.

Abstract: A wheel-at-rest automatic brake system including a base, a cam, two reset brackets and an interlocking gear is installed in a wheel hub and connected to a wheel shaft of the wheel hub. The base is installed in the wheel hub and has multiple mounting holes and three first pivot holes; the cam is hinged to the first pivot hole and has a protrusion and two driving portions; the two reset brackets are pivoted to the remaining two first pivot holes; each driving portion has a limit notch; the interlocking gear is fixed to the wheel shaft and engaged to the protrusion; and the two driving portions are situated in the two limit notches to define a locked state. When moving, the interlocking gear drives the protrusion to deflect, and the two driving portions prop the two reset brackets up to define a released state.