US 4,050,206 AGranted

Expansion jointing material for placing concrete, mortar or the like

OwnerAkira Utsuyamainventor

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Abstract

An expansion jointing material for placing concrete, mortar or the like which comprises a jointing material of elastic substance and a cover member placed over the jointing material and extending in the longitudinal direction thereof. In operation, a plurality of the jointing materials are preliminarily positioned and adjusted to a predetermined height along the partition lines to form a plurality of partitions into which concrete, mortar or the like is deposited to produce laid surfaces of concrete or the like using the upper portions of the cover members as the reference levels. The jointing materials are completely buried in the concrete, mortar or the like except the upper portions of the cover members to absorb or compensate for the expansion or contraction of the concrete, mortar or the like.

Claims16

Dependent claims

A joint forming and sealing assembly adapted to be laid in place on a surface prior to forming a slab of concrete or mortar, comprising:

an elongated elastic compressible jointing member having substantially the shape of a board and having upper and lower edges and opposite sides;
a plurality of support assemblies located at selected longitudinally spaced-apart positions along said jointing member, each support assembly comprising an upper portion of inverted substantially U-shape cross section and a pair of support legs extending downwardly from said upper portion and diverging with respect to each other, the lower ends of said support legs being adapted to rest on said surface and being adjustable toward and away from each other to adjust the height of said upper portion, the upper portion of said jointing member being snugly received within and substantially filling said upper portion of said support assembly and being compressed thereby, said support legs diverging away from the opposite sides of said jointing member in a direction toward the lower edge thereof;
and an elongated cover member extending along the entire length of said jointing member and comprising a clamping section and an elastic reference section, said clamping section comprising a pair of downwardly extending legs snugly sleeved on the exterior of said upper portions of said support assemblies and extending downwardly therealong substantially to the positions at which said support legs begin to diverge, said legs of said clamping section also snugly contacting the opposite sides of said jointing member in the zones between the support assemblies, said reference section projecting upwardly from said clamping section and defining at its upper end a pair of longitudinally extending reference surfaces for use in smoothing the surface of the concrete or mortar, said support assemblies and said cover member having interengaging means for releasably coupling same together.

A joint forming and sealing assembly adapted to be laid in place on a surface prior to forming a slab of concrete or mortar thereon, comprising:

an elongated elastic jointing member having substantially the shape of a board and having upper and lower edges and opposite sides;
an elongated cover member comprising a clamping section and a separable elastic reference section, said clamping section being of inverted substantially U-shape cross section and being sleeved on the upper end of said jointing member, said clamping section having a pair of generally parallel, depending legs respectively extending downwardly along the ends of said jointing member from said upper edge partway to said bottom edge, said reference section projecting upwardly from said clamping section and having a substantially horizontal top wall, a pair of longitudinally extending laterally spaced projections extending upwardly from said top wall at the opposite lateral ends thereof, said projections defining reference surfaces for use in smoothing the surface of the concrete or mortar;
said elastic reference section being slidably, detachably and replaceably attached to said clamping section, said clamping section and said elastic reference section having interfitting male and female connecting structures for releasably joining together said sections.

Dependencies are inferred from the claim text.