초록 ▼

A construction unit for assembling into a ladder like assembly wherein the unit is provided with parallel and opposed side rails joined by at least one cross-member, the ends of the side rails being adapted for end to end telescopic joining into a multi-unit assembly, the side rails of the units bei

A construction unit for assembling into a ladder like assembly wherein the unit is provided with parallel and opposed side rails joined by at least one cross-member, the ends of the side rails being adapted for end to end telescopic joining into a multi-unit assembly, the side rails of the units being hollowed to accept, internally thereof, elongated reenforcing and retaining members which may be threaded through all the side rails, in sequence, of an assembly of units.

대표청구항 ▼

A construction unit for assembling into a multi- step ladder similar device comprising, a unit provided with two spaced and parallel opposed side rails, a cross member joined at each of its ends to one of the side rails to form a unit having a H like configuration, at least one end of each side rail

A construction unit for assembling into a multi- step ladder similar device comprising, a unit provided with two spaced and parallel opposed side rails, a cross member joined at each of its ends to one of the side rails to form a unit having a H like configuration, at least one end of each side rail being reduced to facilitate telescopic insertion into the unreduced end of a further H like unit to form a stepped ladder like construction, and wherein the side rails are adapted to, at least partially, enclose and retain elongated reenforcing members which are inserted into the side rails to reenforce the side rails and act as retainers for securing units in assembled relationship.