초록 ▼

A mobile scaffold unit having a wheeled base frame and a horizontal work platform, interconnected by upper end lower scissors sets. Each scissors set has a power arm and a stabilizer member, and the upper and lower pivotally connected power arms have a hydraulic ram connected therebetween. The upper

A mobile scaffold unit having a wheeled base frame and a horizontal work platform, interconnected by upper end lower scissors sets. Each scissors set has a power arm and a stabilizer member, and the upper and lower pivotally connected power arms have a hydraulic ram connected therebetween. The upper and lower power arms are pivotally connected to the platform and base frame respectively and have a length greater than the length of the platform, with the ram being connected to the power arms beyond the platform. The width of the scissors set is considerably less than the distance between the wheels on opposite sides of the frame, enabling the scissors set to be disposed between the wheels and to be mounted to the base frame at a level considerably below the upper surfaces of the wheels. The power arms are made up from three beams connected in a fork manner and provide two parallel beams where the forces are greatest and a single beam where forces are relatively low.

대표청구항 ▼

An elevatable work platform apparatus comprising: a horizontal frame, a generally rectangular and horizontal work platform above said frame member, said work platform having a given length and width, upper and lower scissors sets, each set having an elongated power arm and an elongated stabilizer me

An elevatable work platform apparatus comprising: a horizontal frame, a generally rectangular and horizontal work platform above said frame member, said work platform having a given length and width, upper and lower scissors sets, each set having an elongated power arm and an elongated stabilizer member, said power arm and stabilizer member of each set being pivotably connected to each other, said power arms each being longer than the length of said work platform. means pivotally connecting one end of the lower power arm to one end of said frame, means pivotally connecting one end of the upper power arm to one end of said work platform, means pivotally connecting the other ends of said lower and upper power arms together, means movably interengaging one end of the lower stabilizer member with the other end of said frame, means movably interengaging one end of the upper stabilizer member with the other end of said work platform, means pivotally connecting the other ends of said lower and upper stabilizer members together, a generally vertical ram having a cylinder and piston rod portions, means pivotally connecting said cylinder and piston rod portions to said lower and upper power arms, with part of said ram extending upwardly from said upper power arm, and with the distance from the pivotal connection of said upper power arm and said work platform to the pivotal connection of said upper power arm and the ram portion connected thereto being greater than the distance from the pivotal connection of said upper power arm and said work platform to the other end of said work platform.