US1678959A

US1678959A - Edge-protected board

Info

Publication number: US1678959A
Application number: US114614A
Authority: US
Inventors: Schumacher John
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-06-09
Filing date: 1926-06-09
Publication date: 1928-07-31
Anticipated expiration: 1945-07-31

Description

July 31, 1928.

J. SCHUMACHER EDGE PROTECTED BOARD Filed June 9, 192's 2 Sheets-Sheet 1 A TTORNEYS.

July 31, 1928. 1,678,959

I J. SCHUMACHER EDGE PROTECTED BOARD Filed June 9. 1,526 2 Sheets-Sheet 2 ATTORNEYS,

Patented July 31, 1928.

UNITED STATES JOHN SCHUMACHER, DE LOS ANGELES, CALIFORNIA.

EDGE-PROTECTED BOARD.

Application filed June 9, 1926. Serial No. 114,614.

This invention relates to a plaster board having a reinforced edge partially covered. The core of plaster board is brittle so that, if subjected to rough usage in handling, it will crack and chip. An attempt has been made to overcome this objection by completely covering the plaster core at the edge with paper. For obvious reasons it has been found difiicult to effect a good bond between the paper at the edge and the core. Furthermore, the paper does not provide as effective a surface for the adhesion of cement putty used at joints, as does the plastic core it'- self.

The present invention has for its primary object the provsion of a plaster board having a partially exposed edge, the edge covering providing a reinforcement. Another object of this invention is the provision of a plaster board having the edge partially covered by turning a cover sheet thereover and embedding it in the core. A further object of this invention is to provide an edge of the character described which has recesses for the anchoring of adjacent boards.

These objects toegther with other objects and corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawing, in which:

Fig. 1 is a perspective view of a panel of one form of plaster board embodying my invention; Fig. 2 is a perspective view of a panel of plaster board of another form; Fig. 3 is a perspective view of a modification of the board shown in Fig. 1; and Fig. 4: is an end view offragments of adjacent panels of the form shown in Fig. 1.

Referring with more particularity to the drawing and especially to Fig. 1, the plaster core of a wall board is indicated by 5. This core is commonly formed of a gypsum composition well known in the art. On the face of the cores is a cover sheet 6, preferably of paper and ending flush with the edges of the board. The construction may be such that the cover sheet isfirmly bound to the plaster core. The particular method of effecting this bond is not pertinent to the present invention. However, it is the common practice of applicant to use a cover sheet which is slowly permeable to moisture. On the other face of the plaster core is a cover sheet 7. This cover sheet is of a length greater than the panel so that it may be turned over the edges thereof as indicated by 8. The ends of the cover sheets are then turned inwardly so as to be embedded in the plaster core. The portions 8 of the cover sheets are rounded and of such dimensions that they preferably cover about one-half of the edge of the plaster core. The embedded portion serves to anchor the edge and also to provide a reinforcement for the core at the edge. There is left an exposed portion of the plaster core indicated by 9. This portion will aid in the adhesion of the plaster cement which is used at the joints of panels in building up a wall. The cover sheet 7 is preferably formed of paper slowly permeable by moisture and placed in position while the core is in its plastic state. An inset 10 is formed by removal of a portion of the plaster core. In abutting panels as shown in Fig. 4; plaster putty is inserted in the oint. This forms a connection 11 which when hardened anchors the panels by reason of the protrusions disposed in the insets.

Referring more particularly to Fig. 2, the

plaster core is indicated by 12. The upper and lower cover sheets are indicated by 13 .and 14. respectively. The upper cover sheet ends flush with one edge of the board, and

the other edge is long so that it may be turned over to cover a portion as indicated by 15 and then embedded in the core. The lower cover sheet is turned over the edge as indicated by 16 and then embedded in the core. The construction is such as to provide a partially covered edge board differing from the structure shown in Fig. 1, in that, the cover sheets are both used for protecting the edges, one being used at one edge and the other at the opposite edge. Another diiference is that the edge covering is angular in its bends and flat at the edge.

In Fig. 3 I' have shown a board with an edge covering similar to Fig. 1. However, the plaster core at the edge merges with the rounded cover without an inset being formed.

What I claim is:

1. A plaster board comprising a cementitious core, a cover sheet therefor having a.

margin extended over the edge in head form so as to partially cover the edge, an inset being formed at the juncture of the marginal ing an inset recess in the edge face formed edge and core. With one Wall thereof including a portion of 2. A plaster board comprising a cenientisaid inturned margin. 10 tious core, a cover sheet therefor having a In Witness that I claim the foregoing I 5 margin extended over the edge so as to parhave hereunto subscribed my name this 2nd tially cover the same, said margin being inday of June, 1926. turned and embedded in the core, and hav- JOHN SCHUMACHER.