Multifunctional scaffolding and pushcart convertible utility device
OwnerDavid C. CALVERT, Christopher R. WEBB +5inventors
InventorsDavid C. CALVERT, Christopher R. WEBB, Tsailu LIU, Paul W. HOLLEY, Michael K. THOMPSON, W. Travis LONTZ, Grant L. BITTLE
Life of this patent
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Abstract
A multi-functional utility apparatus that is convertible between a scaffold configuration and a pushcart configuration. A pivotal coupling assembly between first and second subframes allows the subframes to be expanded for use as a scaffolding or collapsed for use as a pushcart.
Claims25
A multifunctional utility device comprising:
- a support platform;
- a first subframe assembly;
- and
- a second subframe assembly;
- wherein the first and second subframe assemblies are convertible between a first configuration forming a scaffolding with the support platform in an elevated position and a second configuration forming a pushcart with the support platform in a lowered position.
An apparatus convertible from a rolling carrier to an elevated support structure, the apparatus comprising:
- a support platform;
- first and second outer subframes;
- and
- a central subassembly pivotally coupling the first and second outer subframes and allowing the first and second outer subframes to move between a rolling carrier configuration wherein the support platform is positioned at a first elevation and an elevated support structure configuration wherein the support platform is positioned at a second elevation higher than the first elevation.
A convertible pushcart/scaffolding apparatus comprising:
- a first subframe assembly comprising a first pair of generally parallel siderails and a first plurality of rungs extending between and generally perpendicular to the first pair of siderails, and a first pair of axial caster wheels extending axially from ends of the first pair of siderails;
- a second subframe assembly comprising a second pair of generally parallel siderails and a second plurality of rungs extending between and generally perpendicular to the second pair of siderails, a second pair of axial caster wheels extending axially from ends of the second pair of siderails, and side caster wheels extending transversely from the second pair of siderails;
- a central subassembly comprising first and second subassembly halves, and further comprising a first hinged connection between the first and second subassembly halves, a second hinged connection between the first subframe assembly and the first subassembly half, and a third hinged connection between the second subframe assembly and the second subassembly half, whereby the central subassembly allows the first and second subframe assemblies to be reconfigured between (a) an expanded configuration wherein the first and second subassembly halves are extended linearly and the first and second subframe assemblies are spaced a greater distance away from one another, and (b) a collapsed configuration wherein the first and second subassembly halves are folded against one another and the first and second subframe assemblies are spaced a lesser distance away from one another;
- and
- a platform repositionable between an elevated position when the first and second subframe assemblies are configured in the expanded configuration and a lower position when the first and second subframe assemblies are configured in the collapsed configuration.
Dependencies are inferred from the claim text.