# Patent

## Title
Assembly for bridging over expansion joints

## Abstract

While the invention has been described in its preferred embodiments, it is to be understood that the words which have been used are words of description rather than limitation and that various changes and modifications may be made within the purview of the appended claims without departing from the true scope and spirit of the invention in its broader aspects.

## Background
## Claims

United States is:

1. A securing unit for holding two substrates at a fixed interval, a first one of said substrates having a rectangular aperture therethrough and the second one of said substrates having a circular aperture therethrough in alignment with the rectangular aperture in the first substrate, said securing unit comprising: use, bears resiliently against a first side of the first substrate, said resilient reverse detention member being sized and shaped so as not to pass through the rectangular aperture in the first substrate; aperture in the first substrate; detention member and said support base, said first linkage member being perpendicular to the working surface of said resilient reverse detention member and, in use, extending through the rectangular aperture in the first substrate; first linkage member towards said resilient reverse detention member, each of said at least two first resilient detent leg members having an abutment surface which is sized, shaped, and positioned to make planar abutting contact with a second side, opposite to the first side, of the first substrate and an extension having a planar outer surface, said extension extending into the rectangular aperture in the first substrate and the planar outer surface of said extension being sized, shaped, and positioned to make planar abutting contact with a planar side surface of the rectangular aperture in the first substrate, said at least two first resilient detent leg members being tapered inwardly in the first direction and being resiliently inwardly deformable by camming contact with the periphery of the rectangular aperture in the first substrate as said at least two first resilient detent leg members pass through the rectangular aperture; aperture in the second substrate; pedestal; pedestal and, in use, extends through the circular aperture in the second substrate; second linkage member toward said pedestal, each of said at least two second resilient detent leg members having an abutment surface which is sized, shaped, and positioned to make planar abutting contact with the second substrate; and said pedestal and sized, shaped, and positioned to make resilient contact with the second substrate.

2. A securing unit as recited in claim 1, comprising at least two resilient pushing pieces integrally formed with said pedestal and sized, shaped, and positioned to make resilient contact with the second substrate, each of said at least two resilient pushing pieces extending in a straight line in plan view and having a free end, said at least two resilient pushing peices being symmetrically disposed with respect to said second linkage member with their free ends facing oppositely to each other.

3. A securing unit as recited in claim 1 and further comprising at least two linkage pieces, each one of said at least two linkages pieces extending between said pedestal and a corresponding one of said at least two second linkage members.

4. A securing unit for holding two substrates at a fixed interval, a first one of said substrates having a first aperture therethrough and the second one of said substrates having a second aperture therethrough in alignment with the first aperture in the first substrate, said securing unit comprising: use, bears resiliently against a first side of the first substrate, said resilient reverse detention member being sized and shaped so as not to pass through the first aperture in the first substrate; aperture in the first substrate; detention member and said support base, said first linkage member being perpendicular to the working surface of said resilient reverse detention member and, in use, extending through the first aperture in the first substrate; first linkage member towards said resilient reverse detention member, each of said at least two first resilient detent leg members having an abutment surface which is sized, shaped, and positioned to make planar abutting contact with a second side, opposite to the first side, of the first substrate and an extension having an outer surface, said extension extending into the first aperture in the first substrate and the outer surface of said extension being sized, shaped, and positioned to make surface abutting contact with a side surface of the first aperture in the first substrate, said at least two resilient detent leg members being tapered inwardly in the first direction and being resiliently inwardly deformable by camming contact with the periphery of the first aperture in the first substrate as said at least two resilient detent leg members pass through the first aperture; aperture in the second substrate; pedestal; pedestal and, in use, extends through the second aperture in the second substrate; second linkage member toward said pedestal, each of said at least two second resilient detent leg members having an abutment surface which is sized, shaped, and positioned to make planar abutting contact with the second substrate; and said pedestal and sized, shaped, and positioned to make resilient contact with the second substrate.

5. A securing unit as recited in claim 4, comprising at least two resilient pushing pieces integrally formed with said pedestal and sized, shaped, and positioned to make resilient contact with the second substrate, each of said at least two resilient pushing pieces extending in a straight line in plan view and having a free end, said at least two resilient pushing peices being symmetrically disposed with respect to said second linkage member with their free ends facing oppositely to each other.

6. A securing unit as recited in claim 4 and further comprising at least two linkage pieces, each one of said at least two linkage pieces extending between said pedestal and a corresponding one of said at least two second linkage members.