US1202780A - Blackboard-liner. - Google Patents

Description

B. N. BLACK.

BLACKB'OARD LINE-R.

APPLICATION FILED APR-4,1916.

Patented Oct. 31, 1916.

BENJAMIN 1\T. BLACK, OF PATERSON, NEW JERSEY.

IBLACKBOABD-LINER.

Application filed April 4, 1916.

To all whom it may concern:

Be it known that I, BENJAMIN N. BLACK, a citizen of the United States, residing at Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Blackboard-Liners, of which the following is a specification, reference being had therein to the accompanying drawing.

One object of my invention is to provide a rapid and reliable liner for blackboards which will make a number of parallel lines or concentric circles in various relative positions by means of marking-crayons or other marking materials without regard to the differences in length of the crayons and to produce a holder for the crayons in which they may be arranged and adjusted with ease and facility and in which they may be tilted without slipping when in use.

A further object of my invention is to provide a device that will be an aid to the teacher in blackboard illustration and that may be taken apart and put together quickly and which when taken apart may be handily packed in a small parcel for shipping or mailing purposes.

A further object of my invention is to provide grooved fingers, pivotally secured to the main body, each finger being independent of the others and having elastic means for controlling the tilting movement of its individual crayon, While in use, in the groove wherein it is held.

A still further object of my invention is to produce a blackboard-liner simple in construction, practical, durable and cheap.

The accompanying drawings illustrate my invention, similar letters of reference in the various figures indicating like parts.

Figure 1 is a plan view of the bottom of my blackboard-liner, the crayons being held in position in the longitudinal grooves in the fingers by their respective elastic bands or cords, which pass over the crayons and through the transverse grooves in the top of the fingers. Fig. 2 is a vertical sectional view on the line 22 of Fig. 1, showing the arrangement of the finger, crayon and elastic band. Fig. 3 is a View in cross section on the line 38 of Fig. 1, further showing the method of holding the crayon in the finger. The dotted lines in Fig. 1 show the Specification of Letters Patent.

Patented @ct. 31, 119116.

Serial No. 89,465.

pivotal movement of the fingers, and the dotted lines in Fig. 2 illustrate the tilting of the crayon when in use.

In the drawings, A is the main or body portion; A are the fingers, A the longitudinal grooves in the fingers, A the transverse grooves in the fingers to receive the elastic band or cord, B the handle, C the crayons, E the elastic bands or cords and S the pivot screws securing the grooved finger to the body portion A.

It is obvious that crayons, pencils, brushes or other marking materials or devices may be used in the longitudinally grooved fingers, if desired. In each instance the elastic band will hold the article used in position and permit it to be tilted, the end of the finger forming a fulcrum. The crayon may be moved longitudinally in the grooved finger as long as it lasts.

If it is desired to use only the two end crayons, the intervening crayons may be pushed back out of action. pivotal arrangement of the fingers, they may be moved toward or away from each other, as desired, to regulate the space between lines or between concentric circles.

In teaching music, writing, bookkeeping, arithmetic, geometry, and other subjects this liner will be of great utility, as two or more lines may be drawn parallel in any direction and circles and arcs in various relative positions, as above stated. An advantage quite apparent with my invention is the fact that the handle may be removed and folded up with the stock or body, when it makes a small neat package easily handled, shipped, or mailed. The tautness of the elastic band is regulated with ease and facility. The elastic band or cord permits the use of crayons of unequal length, as it yields gently to the pressure necessary to cause the crayons to tilt and trace the lines or figures desired. The tautness of the elastic band may be regulated by giving the elastic band one or more extra wraps around the finger. The ends of the handle are pressed toward each other to insert them in the holes in the body portion which receives them, and the tension thus secured is suflicient to retain the handle in the body portion for ordinary purposes. By pressing the ends of the handle, the tension is re- Owing to the moved sufliciently to allow the Withdrawal of the handle from the body portion with facility.

The crayon may be utilized extent as if used by hand.

With this description or my invention, What I claim is: I

1. In a blackboard-liner, a body portion having a removable handle, in combination With a plurality of fingers pivotal'ly secured to the body portion, and longitudinally grooved on their under sides, each groove forming a receptacle fora crayon or the like, eaclr finger having on its upper face, near the free end thereof, a transverse groove to hold an elastic retainer, and an elastic retainer passing through said transverse to the same groove and around the crayon, substantially as set'forth.

2'. The body portion, in combination With a'plurality of longitudinally grooved fingers, pivotally secured thereto, a plurality of crayons or other marking articles adapted to be held in the grooves of the fingers and each finger having elastic means independent of the other fingers and adapted to holdthe crayon in the finger groove and permit the-crayon to tilt, substantially as set forth;

3. A blackboard-liner comprising a body portion, and a plurality of fingers pivotally secured thereto, each finger having on one face a longitudinal groove adapted to hold a marking article, and on its opposite face a transverse groove adapted to hold an elastic retainer, and an elastic means adapted to pass through said transverse groove and around the marker to hold the same in the groove in the finger and to permit'it to tilt when in use, substantially as set forth.

st. In a blackboard-liner, a pivotally arranged finger longitudinally grooved on' its under surface to form a receptacle fora marking material, and provided on its upper face With a transverse groove adjacent to i the tip of the finger, adapted to hold an elastic material and an elastic retainer passing through said groove onthe upper face of the finger and around the marking material to permit the marking material to be tilted, the end of the finger forming a fulcrum.

In testimony whereof I aflix my signature in presence of two Witnesses.

BENJAMIN N. BLACK. Witnesses:

Gnn'rnnnn A. MOODY, JOHN F. KERR.

Cofiies of this: patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. 0.

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