Cement board having reinforced edges

• US 4,916,004 A
• Filed: 12/27/1988
• Issued: 04/10/1990
• Est. Priority Date: 02/20/1986
• Status: Expired due to Term

• Current Assignee: United States Gypsum Company (GEBR Knauf Verwaltungsgesellschaft KG)
• Original Assignee: United States Gypsum Company (GEBR Knauf Verwaltungsgesellschaft KG)
• Inventors: McCleary, Robert E., Ensminger, Robert P., Wenzlow-Lukasch, Ludwig
• Primary Examiner(s): Bell, James J.
• Application Number:
  US07/290,841
• Time in Patent Office: 469 Days
• Field of Search: 428/113, 428/192, 428/193, 428/247, 428/251, 428/255, 428/273, 428/703
• US Class Current: 428/192
• CPC Class Codes: B28B 23/0006 the reinforcement consisting of aligned, non-metal reinforcing elements
• CPC Class Codes: E04C 2/06 reinforced
• CPC Class Codes: Y10T 428/24124 Fibers
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24785 including layer embodying mechanically interengaged strands, strand portions or strand-like strips [e.g., weave, knit, etc.]

Abstract

A cement board having bare surfaces and a mesh of reinforcing fibers underlying the top, bottom, and longitudinal edge surfaces is made continuously on an improved apparatus which comprises a pair of edger rails which slidably rest on a conveyor belt and define the path of the cement board being made on the conveyor belt and a means for folding and pressing outer margins of the bottom mesh into the edge surfaces and the top surface.

Claims

1. A cement board consisting essentially of a core, a bottom surface, a top surface, uniform longitudinal edge surfaces, and a mesh of reinforcing glass fibers embedded in the core just beneath said surfaces.

2. The cement board of claim 1 wherein a first mesh is embedded in the core at the bottom surface, at the edge surfaces, and at the longitudinal margins of the top surface.

3. The cement board of claim 2 wherein a second mesh is embedded in the core at the top surface in layered relation to the first mesh.

4. The cement board claim 3 wherein the first mesh overlaps the second mesh.

5. The cement board of claim 1 wherein the longitudinal margins along the top surface and the edge surfaces are smooth.

7. The cement board of claim 1 wherein the mesh is woven.

6. An uncovered wallboard comprising a hydrated cementitious core, a bottom surface, a top surface, uniform longitudinal edge surfaces, and a mesh of reinforcing glass fibers just beneath said surfaces.

8. The wallboard of claim 6 wherein the mesh is woven.