Abstract: A scooter structure includes a vertical frame and a pedal body. The bottom of the vertical frame connects to (a) front wheel(s). The rear end of the pedal body connects to (a) rear wheel(s), the front end of the pedal body connects to an auxiliary supporter. The auxiliary supporter includes a pivoting portion pivoted at the bottom of the vertical frame and an extension element located higher than that of the pivoting portion. The extension element connects to auxiliary wheels by an assembling component. The pedal body uses the pivoting portion as the rotation shaft, and is selectively rotated between an expansion position (the pedal body is away from the vertical frame and the rear wheel is on the ground) and a folded position (the pedal body is close to the vertical frame and the auxiliary wheels are on the ground) with respect to the vertical frame.

Abstract: A railroad car-warning bell is centrally mounted on the hub of a wheel. Three opposed cylinder housings each contain a reciprocating ball which hits an end hammer to sound the bell when the wheel turns slowly up to speeds of nominally 15 mph. At higher speeds the balls are held against the end hammers, thereby automatically shutting off the bell to prevent noise pollution. The preferred embodiment has a single cylinder mounted along a diameter of the ringing bell. Three steel balls oscillate back and forth hitting a hammer at each end of the cylinder. A dampener may be used to adjust the ring of the bell.

Abstract: A heat activated adhesive film is disclosed, 2-15 mil thick, for bonding a circuit-printed substrate to its support. The adhesive's main constituent is a thermoplastic organic high polymer containing the elements of carbon and hydrogen, and one or more of the elements oxygen, nitrogen, sulfur, halogen in its repeating unit. The polymer's Vicat softening temperature is 70.degree.-280.degree. C. Optionally, the adhesive may also contain up to 45 volume percent of a thermally conductive inorganic filler of 0.5-20 micrometer particle size. The attachment process simply consists of heating and pressing the film, sandwiched between the adherent surfaces, above the melting temperature and cooling to ambient.

Abstract: A wheel hub mountable back up alarm is disclosed having a plurality of ringing units mounted interiorly of a bell. Each ringing unit has an improved clapper and an improved interacting keeper to prevent forward wheel motion ringing, to retard alarm freezing and sticking, and to provide minimum wear on non-ringing rotation.