Multi-level interlocking blocks

Details Multi-level interlocking blocks Multi-level interlocking blocks

2007-03-27

2008-08-26

Canfield, Robert (Department: 3635)

Implements or apparatus for applying pushing or pulling force

Inclined plane lifter

C052S604000, C446S128000

Reexamination Certificate

active

07416166

ABSTRACT:
The present invention is a unitary piece block formed of polymers (such as polystyrene or other high strength polymer) by a single injection molding step which are assembled into a recreational vehicle leveler. The invention ramp provides four sets of four connectors at a top of a floor plate, which are adapted to interlock in cavity structures formed within a cavity on the underside of the block. Two adjacent blocks are secured together by applying to their top surfaces the securing cavity structure of an underside of a third such block. Such blocks can be stacked in an interlocking manner to reduce storage space.

REFERENCES:
patent: 3162973 (1964-12-01), Christiansen
patent: 3487579 (1970-01-01), Brettingen
patent: 5458315 (1995-10-01), Blatz et al.
patent: D426933 (2000-06-01), Redfern
patent: 7040603 (2006-05-01), Tai et al.

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