초록 ▼

A convertible hand cart convertible between a two wheel hand cart for vertically loading of materials and a four wheel hand cart providing a horizontal material loading platform. The wheel structure for providing the four wheel configuration is pivotably secured to the two wheel structure and movabl

A convertible hand cart convertible between a two wheel hand cart for vertically loading of materials and a four wheel hand cart providing a horizontal material loading platform. The wheel structure for providing the four wheel configuration is pivotably secured to the two wheel structure and movable between the two wheel and four wheel configurations. The two wheel configuration includes structures for locking up the wheel structure for the four wheel configuration thereto. The locking structure is constructed and defined with minimum parts and operable based on vertical sliding action to minimize wear on the locking structure parts. A foot operative mechanism is provided to release the locking structure to permit the wheel structure to be released from a locked up position, hands free, to commence the reconfiguration to the four wheel cart.

대표청구항 ▼

A convertible hand cart convertible between a two wheel hand cart for vertically loading of materials and a four wheel hand cart providing a horizontal material loading platform. The wheel structure for providing the four wheel configuration is pivotably secured to the two wheel structure and movabl

A convertible hand cart convertible between a two wheel hand cart for vertically loading of materials and a four wheel hand cart providing a horizontal material loading platform. The wheel structure for providing the four wheel configuration is pivotably secured to the two wheel structure and movable between the two wheel and four wheel configurations. The two wheel configuration includes structures for locking up the wheel structure for the four wheel configuration thereto. The locking structure is constructed and defined with minimum parts and operable based on vertical sliding action to minimize wear on the locking structure parts. A foot operative mechanism is provided to release the locking structure to permit the wheel structure to be released from a locked up position, hands free, to commence the reconfiguration to the four wheel cart. 930700, Rosso et al.; US-D341863, 19931100, Cavasin; US-D342113, 19931200, Cavasin; US-D344316, 19940200, Gertler; US-D345405, 19940300, Cavasin; US-D346633, 19940500, Conte; US-D347237, 19940500, Robjent et al.; US-5357695, 19941000, Lu; US-D353429, 19941200, Gay et al.; US-5394624, 19950300, Siepser; US-5397141, 19950300, Hoshizaki et al.; US-5404657, 19950400, Honeycutt; US-5449183, 19950900, Klamer et al.; US-5475936, 19951200, Cavasin; US-5484149, 19960100, Lee; US-5566475, 19961000, Donnadieu; US-5572806, 19961100, Osawa; US-5575015, 19961100, Paris et al.; US-5634648, 19970600, Tonel et al.; US-5645288, 19970700, Lu, 280/011.26; US-5678833, 19971000, Olson et al., 280/011.22; US-5704139, 19980100, Okajima; US-5913526, 19990600, Olson et al., 280/011.22; US-6045144, 20000400, Wong, 280/011.26; US-6050574, 20000400, Olson et al., 280/011.22; US-6471219, 20021000, Olson et al., 280/011.231