US627396A - Blackboard - Google Patents

Description

No. 627,396. l Pmnfed :une 2o. |899.

T. F. DALY.

LAcKBoAnn.

(Application med Dec. 31, 1898.) (No Modal.)

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i UNITED kSTATES PATENT OEEICE.

THOMAS E. DALY, OF vNEW YORK, N. Y.

y BLAOKBOARD.

SPECIFICATION :formingpart of Letters Patent No. 627,396, dated June 20, 1899.

' Application ia'necember 31,1398,A serial No. 700,852. (No model.)

Be it known that I THOMAS F. DALY, a citizen of the United States, residing at Brooklyn borough, city of New York, in the county of Kings and State of NewYork, have invented new and useful Improvements in Blackboards, of which the following is a specifica- A tion.

This invention relates to improvements in` be positioned with respect to the fixed board,

5o The case C consistsof atop board c and bot-v so that the slides maybe adj usted to cover either end Yof the fixed vboard or the inner slides carried by the case, the construction also embodying means whereby the case may be turned upon its support to expose the opposite sides of the slides and either end of the fixed board, the construction also providing means for holding the slides ina fixed position and supporting the ends thereof whichVV are positioned beyond the case. l

In the accompanying drawings,\which illustrate my invention, Figure l is a perspective view of a blackboard embodying my improvements. Fig. 2 is a front elevation; and Fig. 3 is a side view, the case being shown as positioned away from the fixed board.

Referring to the drawings, A designates a blackboard as usually constructed, which is mounted in a frame rigidly attached toa wall or other surface. On a line with the center of the board A are secured two plates b b', having vertical bearings for the ends of arms B B', which arms swing freely in the bearings, the upturned end of the upper arm B i having a nut which serves to provide means for causing frictional engagement of the arm with the' bearing to take up any lost motion. The outer ends of the arms B B have therein longitudinal slots, through which pass pivotpins b2, said pins engaging with plates attaohed to the upper and lower sides of a case C.

tom board c', to which are attached frames o2,

.which connect the boards to each other, which boards have parting-strips c3, Y Between the `partingstripscarried by the bottom or under `board c are rollers c4, which are spaoedat suitable intervals andmountedon journals which pass through the lower board.

D refers to a series of slides or framed boards lwhichl are placed within the case vand rest u ponV the rollers carried thereby. rlhese slides have writing-,surfaces on both faces and are provided with apertures d in the outer ends of the vertical frames. The case may be of a size to receive quite a number of the slides, and when the case is moved away from the fixed board the order of the slides may be.

changed.

E refers to stop-boards, which are rigidly yattached to thevertical ends of the board A,

so as to project at right angles therewith, and these stop-boards carry hand-screws e,which are so positioned as to register with the threaded vapertures `in the end frames of the slides 'D. To the wall or support for the' board A are secured yslotted guides F, with which cngage sliding shelves or brackets G,`Which are adapted to be placed on either side of ythe stop-boards E, said bracketsserving as a support for the ends of the slides which areL projected from the case.

In general use the board A is about twice the length of the case C, and when said case is swung either to the right or to the left and moved inward against the frame of the board A one end of the oase will abut against one of the stop-boards E, and when in such position the slides D may be moved over the eX- posed surface of the board A and when so positioned can be made fast to the opposite stop-board,the bracket serving to support the slides until madefast. Should it be desired to reverse the slides, the arms or supports for the case can be moved outward, so as to be at substantially right angles with the board A, and when in such position the case can be turned upon its supporting-pivots- It will be noted by the construction shown that a board of this construction maybe used either for educational uses, as in school rooms, or for stock-quotations,'and thearrangement and construction are such'that a large amount of writing-surface is provided ICO in a small space and that the boards or slides may be covered to keep mattei' out of sight until desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In combination with a fixed writing-surface or blackboard, of a case having a plurality of slides, arms which are pivotally attached to iixed supports and to the case together with brackets with which the ends of the slides when projected beyond the case may engage substantially as shown and for the purpose set forth.

2. In combination with a Xed writing-surface or blackboard,of a case containing slides, means for supporting the case so that it can be swung toward either-end of the iixed blackboard and vertical stop-boards located adjacent to the ends ot' the Iixed board so as to project and be engaged by the case, substantially as shown.

In combination with a fixed writing-surface and boards which project at right angies from the ends thereof, brackets mounted so as to be movable in front of or to one side of the board, of a case containing a plurality of slides, arms for supporting the case so that it may be turned or caused to abut against either of the projecting boards, and means carried by the projecting boards for engagement with the slides substantially as shown and for the purpose set forth.

4. In a blackboard the combination of a fixed board or Writing-surface, arms pivotally attached to supports positioned centrally with respect to the board, a case carried by the outer ends of the arms, a plurality of slides carried by the case, stop-boards positioned at the ends of the ixed board so as to be engaged by the ends of the case, means carried bythe stop-boards for engagement with the slides carried by the case and brackets supported so as to be moved to either side of the stopboards to provide supports for the slides When projected from the case, substantially as shown and for the purpose set forth.

In testimonywhereof I have hereunto set my hand in presence of two subscribing Witnesses.

THOMAS F. DALY.

lVitnesses:

SAMUEL RAINFORTH, GEORGE DAUsoH.

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