US788635A - Blackboard-eraser. - Google Patents

Description

PATENTED MAY 2, 1905.

E. G. DANNY BLACKBOARD ERASEE.

APPLIUATION FILED SEPT. 19, 1900.

UNITED STATES Patented May 2, 1905.

ERNEST G. DANN, OF CHICAGO, ILLINOIS.

BLACKBOARD-ERASEFL SPECIFICATION forming part of Letters Patent No. 788,635, dated May 2, 1905.

Application filed September 19, 1900. Serial No. 30,505.

To all whom it nuty concern.-

Be it known that I, ERNns'r G. DANN, a citi- Zen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blackboard-Erasers and in Methods of Making the Same; and I do hereby declare that the following is a full, clear, and exact description of my invention, which will enable others skilled in the art to which it appertains to make and use the same.

The object attained by my invention is an eraser for use on blackboards and other surfaces, which while being efficient, durable, and inexpensive to manufacture will also be non-resonant in character and composed of material which will in no ivise injure the black board or other surface with which it is brought in contact, thus not only avoiding the noise and annoyance occasioned by the continual dropping of the eraser while in use in schoolrooms and other places, but also avoiding the use of all such material as wood, metal, and adhesive materials which will scratch, mar, or deface blackboards.

The foregoing and such other objects as may hereinafter appear are attained by the devices illustrated in the accompanying drawings, in which Figure 1 is a perspective view showing the under side of my eraser and showing its attaching-threads in dotted lines, one end of the eraser being cut away to show the manner in which the erasing-strips are attached to each other and are stitched to the back. Fig. 2is a perspective view showing the upper side of my improved eraser.

Similar letters of reference indicate the same parts in both figures of the drawings.

Referring by letter to the accompanying drawings, A represents a strip of heavy felt or other non-resonant material which forms the back or handle part of my eraser.

B, C, and D represent strips of felt or other suitable non-resonant material forming the rubbing or erasing portion of the eraser.

In forming my eraser I take a number of strips B, C, and D of felt or like material, preferably slightly shorter in length than the back or handle piece A and of such thickness that when placed side by side and sewed closely together the aggregate thickness of said strips along the line of sewing will be somewhat less than the width of the back-piece A. Starting with a thread E at a given pointsay at 1-I pass the thread upwardly through the backpiece A at a point adjacent to one corner thereof. Then I sew the thread back down wardly through the back-piece A, thereby forming a loop F, which engages the backpiece A. Then I pass or sew the thread laterally through the upper edges of the erasingstrips B, C, and D and adjacent to one end thereof. 1 then carry the thread upward through the back-piece A adjacent to the edge thereof opposite to the starting-point, and looping the thread over, as shown at 2 in Fig. 1, I pass it again downwardly through the backpiece and back through the erasingstrips to the starting-point, where the free ends are securely knotted or otherwise fastened together, and so on until the strips are all firmly sewed together, the thread of course being drawn taut, and are also firmly secured to the back-piece A by a series of loops F to engage the back-piece and a series of loops Gr upon which the erasing-strips are hung. In this manner I obtain a very simple and compact eraser of the fewest possible parts and free from any material which by any possibility can injure a blackboard or which will make any noise when dropped to the floor. While I thus obtain an eraser in which the erasing-strips are securely attached to the back-piece, my method of obtaining such attachment is such that the strips are left free from each other except immediately adjacent to the back-piece, where they are sewed to each other, thereby rendering the eraser flexible and providing channels between the faces of the strips for gathering the crayon-dust and retaining it until it becomes desirable to remove it by rapping the eraser against any solid object in any usual manner.

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

A blackboard-eraser, comprising an erasing portion formed of a plurality of strips of erasing material, and a handpiece arranged per edge thereof, then upward through said handpiece and again downward through said handpiece, forrnlng a series of loops, whereby said strips are secured to each other and to said handpiece, substantially as described.

In witness whereof I affix my signature in the presence of two witnesses.

ERNEST G. DANN.

Witnesses:

J. W. NEWMAN, Tnos. M. TURNER.

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