US314600A - Blackboard - Google Patents

Description

(ModeL) H. E. MOON.

BLAGK'BOARD.

No. 314,600. Patented Mar. 31, 1885.

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HIRAM E. MOON, OF RICHMOND, INDIANA.

BLACKBOARD.

.EEPECIPICATION forming part of Letters Patent No. 314,600, dated March 31, 1885.

Application filed July 9, 1884. (ModeL) To all whom it may concern:

3e it known that I, HIRAM E. Moon, a citizen of the United States, residing at Richmond, and State of Indiana, have invented a new and useful Improvement in Construction of Blackboards, of which the following is a specification.

My invention relates to improvements in blackboards in which several sections of wood, paper, or other material may be jointed together and permanently fastened to a substantial frame by means of glue, nails, or other fastenings.

The objects of my invention or improvements are, first, to provide a light convenient blackboard of almost any desired length or width, without cracks or joints in the face of the board after the surface has been slated or painted, where single panels of the material used are smaller than the board desired; second, to provide means for holding thin sheets of wood or other material from warping or springing, and to keep the joints from opening where the panels are joined together; third, to provide air-chambers between damp walls and thepanels used, for the purpose of preventing molsture from loosening thejoints or affecting the glue or other substance which may be used in holding the different parts together; fourth, to provide a blackboard which can be finished at the manufactory by experts, and which can be shipped ready to be put up in the school room or office, and of such light weight as to reduce the freight to a nominal price. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 represents a back view of the blackboard, showing the manner of constructing the frame to which the panels are securely fastened before painting or slating; also showing the crosspiece to which the two veneers when jointed together are firmly fastened so the joint cannot open when slated. Fig. 2 represents a front view of the same, with part of one panel cut away, showing the joint between the two panels, the manner of fastening and fitting to back frame and to each other and to the cross-piece under the joint. Fig. 3 represents a front view after the board is completed and painted or slated so as to entirely cover all joints or defects in joining the panels together.

Similar letters refer to similar parts th roughout the several views.

The frame or w and cross-pieces 0, Fig. 1 1, may be made of any convenient thickness or width. All the horizontal pieces which cross the jointings of the veneers should be continuous, and the cross-pieces 0 should be fitted in between them. This prevents the joints from breaking open when covered with paint or slating. The panels A and B may be made from any suitable material, veneers of wood glued together, with transverse grain, being preferable; but tar-board, straw-board, sheetiron, or any other available material may be used.

In construction we first make the frame :20, Fig. 2, the length and width of the proposed blackboard; then take a panel the width of the board and any length obtaiuable,and nail or otherwise fasten its two sides and one end to the frame, and underneath the other end nail the cross-piece O, dividing its surface between the two panels A and B. Joint the panel B to the panel A, so as to form the joint P P, and near the edge of each panel fasten them by nails or otherwise to the cross-piece C, after which one or all the panels used in the construction of the board are dressed to a smooth level surface, and the paint, slating, or other materials are applied, so as to fill all inequalities in the panels and also the joints, so as to make one continuous surface throughout the length and breadth of the board.

If desired, both sides of the frame a: may be covered in the way herein described, and both sides painted or slated, after which it can be converted into a revolving blackboard, if de sired.

In constructing blackboards in this way, where the length would make them inconvenient to handle or ship, I make them in one or more sections, and place them on the wall end to end. Thus, 'if I wish to cover a space twentyeight feet long, I make two sections, each fourteen feet in length, and, in shipping, put face to face. The back frames form a complete protection while being shipped, the two sections being kept in shape while shipping by cleats nailed to the two boards at top and bottom.

Any desired molding may surround this board to suit the taste of customers.

Having described my invention and the piece, having slating material on the surface manner of construction, What I claim as new and air-chambers in the rear, as and for the and novel'and as my invention, and for which purpose specified.

I desire to secure Letters Patent is- A continuous blackboard consisting of a back frame with thin three-ply wood veneers nailed. thereto, with joints secured to cross HIRABI E. MOON.

Witnesses:

OMAR L. HITT E, JOHN H. LUTKEN.

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