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US3943673A Expired / Lapsed US ⏱️ 0.0 years remaining

Cellular floor, wall or the like structure

Assignee: IS Inc SYSTEMS Co
•
Filing: 1974-09-30
•
Granted: 1976-03-16
•
Expires: 1994-09-30
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Abstract

Abstract An improved cellular floor, wall or the like structure is disclosed. The structure in a specific embodiment disclosed, includes a covered raceway for electrical conductors. The raceway has a plurality of knockouts in its cover, and is covered by and at least partially supports a poured concrete floor. The improvement is a plurality of cooperating piston-cylinder assemblies on the raceway cover. Each of the assemblies is a cylinder with a concrete piston therewithin. The cylinder is positioned so that its projection on the raceway cover is larger than and covers one of the knockouts. The piston is capable of limited axial movement within the cylinder, and has an end in substantial contact with one of the knockouts. The piston end is of such size and shape that, when driven toward the knockout, the piston will drive the knockout into the raceway and enter the knockout opening. The piston expands in cross-sectional size away from the end to a size sufficiently large to prevent the piston from going completely through the knockout opening. The piston is a part of and integral with the concrete floor of the structure.

Inventors

  • 👤 Harold T. Lindahl
  • 👤 Theodore Maggos

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 15:09
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/48; H; H02; H02G; H02G3/00; H02G3/28; H02G3/283

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 178 words
In a floor or the like structure including a covered raceway having a plurality of knockouts in its cover, and a monolithic floor or the like covering, and at least partially supported by the raceway, the improvement of cooperatiing piston-cylinder assemblies on the raceway cover, each of said assemblies comprising an outer cylinder and a filler element defining a piston therewith, overlying one of the knockouts, said piston being of such size and shape to be capable of limited axial movement within said cylinder, said piston having an end in substantial contact with one of the knockouts, said piston end being of lesser diameter than that of said cylinder end and said knockout whereby, upon limited axial movement in the direction of the raceway, said piston will drive the knockout into the raceway and enter the opening formerly occupied by the knockout, said piston expanding in cross-sectional size away from said end to a size too large to enter the knockout opening, and said piston comprising a planar section of the floor or the like of said structure.
Claim 2
Dependent Claim 178 words
In a floor or the like structure including a covered raceway having a plurality of knockouts in its cover, and a monolithic floor or the like covering, and at least partially supported by the raceway, the improvement of cooperatiing piston-cylinder assemblies on the raceway cover, each of said assemblies comprising an outer cylinder and a filler element defining a piston therewith, overlying one of the knockouts, said piston being of such size and shape to be capable of limited axial movement within said cylinder, said piston having an end in substantial contact with one of the knockouts, said piston end being of lesser diameter than that of said cylinder end and said knockout whereby, upon limited axial movement in the direction of the raceway, said piston will drive the knockout into the raceway and enter the opening formerly occupied by the knockout, said piston expanding in cross-sectional size away from said end to a size too large to enter the knockout opening, and said piston comprising a planar section of the floor or the like of said structure.
Claim 3
Dependent Claim 43 words
In a floor or the like structure, the improvement claimed in claim 1 which additionally includes a magnetic body embedded in the floor or the like, generally centered within each of said pistons, and near the surface of the floor or the like.

References Cited (Backward Citations)

US1776656A Cited
US1996371A Cited
US2207301A Cited
US2202147A Cited
US2297179A Cited
US2813375A Cited
US2975559A Cited
US3093933A Cited
US3166631A Cited
US3176053A Cited
DE1459913A1 Cited
US3356134A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-03-16 1979-09-15 1980-03-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-03-16 1983-09-15 1984-03-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-03-16 1987-09-15 1988-03-16 $7700.00 Window Closed / Lapsed

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