초록 ▼

This invention is a combination stepladder and hand truck apparatus having a ladder support frame assembly pivotally connected to an upper portion of a hand truck support frame assembly and further including a support and lock plate assembly and a wheel support assembly which are both connected to a

This invention is a combination stepladder and hand truck apparatus having a ladder support frame assembly pivotally connected to an upper portion of a hand truck support frame assembly and further including a support and lock plate assembly and a wheel support assembly which are both connected to a lower portion of the hand truck support frame assembly. The ladder support frame assembly includes a basic support frame with a support handle member at one end portion thereof and interconnected by axially spaced support step assembly. The support step assembly includes a lock or latch step member which is operable to support a user thereon and conjointly locks with the hand truck support frame assembly in a rigid condition when in the stepladder usage condition. The support and lock plate assembly includes a support plate member which is pivotally mounted on a support shaft member which, in turn, is secured across a lower portion of the hand truck support frame assembly. The support plate member is pivotally movable to a nonusage condition when utilizing the invention in a stepladder usage condition. The support plate member is pivotal into a latched or locked condition to hold the ladder support frame assembly against the hand truck support frame assembly when placed in the hand truck usage condition. The wheel support assembly is placed in an elevated position not contacting the adjacent support surface when the invention is moved to the stepladder usage condition. The wheel support assembly is adapted to contact the support surface when the adjacent ladder support frame assembly and hand truck support frame assembly are moved rearwardly to a desired position of 22½degrees from a vertical plane to the support surface to operate as a conventional hand truck structure.

대표청구항 ▼

A combination stepladder and hand truck apparatus, comprising: (a) a ladder support frame assembly having a support handle member and a support step assembly connected thereto; (b) a hand truck support frame assembly having one end pivotally connected to said ladder support frame assembly and a whee

A combination stepladder and hand truck apparatus, comprising: (a) a ladder support frame assembly having a support handle member and a support step assembly connected thereto; (b) a hand truck support frame assembly having one end pivotally connected to said ladder support frame assembly and a wheel support assembly connected to another end of said hand truck support frame assembly; (c) said ladder support frame assembly and said hand truck support frame assembly of inverted V-shaped when in the stepladder usage condition ; and (d) a support and lock plate assembly having a support plate member pivotally mounted between said another end of said hand truck support frame assembly.