Attachment to dividers
US 288235 A
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Description (OCR text may contain errors)
(No Model.) v
g H. HANSTEIN. 7
ATTACHMENT T0 DIVIDBRS. I No. 288,235. Patented Nov. 13, 1883.
I ar. wvaw Z/u I nection with my improved attachment.
40 proven equally unsatisfactory.
-NITED S'rn'rns HERMANN HANSTEIN,
OF CHICAGO, ILLINOIS.
ATTACHMENT TO DlVlDERS.
SPECIFICATION forming part of Letters Patent No. 288,235, dated November 1?, 1885.
Application filed August 10,1853. No model.)
To all whom it may concern.
Be it known that I, HERMANN HANSTEIN, of Chicago, in the county of Cook and State of Illinois, have invented a new, useful, and Irn proved Attachment to Dividers, of which the following is a description, reference being had to the accompanying drawings, in which Figure l is a view of a, pair of dividers, showing the manner of using the same in con- Fig. 2 is a plan view, and Fig. 3 is a side view in elevation, of said attachment.
Like letters of reference indicate like parts in the different figures.
The object of my invention is to provide an attachment to dividers or compasses of such construction that any given point upon a writing or drawing surface may be located and lines struck or measurements made therefrom without bringing the point of said dividers with which said given point has been located in contact with the drawing-surface, and thus preventing injury thereto. Moreover, while said attachment may be applied to dividers as used for all ordinary purposes, my especial object is to provide a device for use upon slates and school black-boards and other like surfaces, to which the ordinary dividers are not adapted. It is well known that in teaching descriptive geometry, for example, no set practically useless, so that the old and crude device of a string attached to a crayon is the only one in general use. Attempts to utilize dividers by attaching blocks of wood, rubber, or leather to the end of one of the legs has I am enabled to accomplish said objects and overcome said difficulties in the following manner:
Upon the leg of a pair of dividers or beamcompasses I place a sleeve or its equivalent,
to which is secured, preferably by a ball-andsocket joint, a pin or red of suitable length, the lower extremity of which is pointed, said pin being loosely secured or pivoted in bearings upon a standard or base in such manner that it may revolve therein, and, when said standard is placednpon the drawing-surface,
may stand preferably in a position perpendicular to said writing-surface, with the point very near to the same. I prefer to tip said base with rubber or other like material to prevent slipping, and to so construct the same that the point of said rod may be readily seen by the operator, and thus accurately placedby him wherever desired, all of which will be hereinafter more particularly described, and definitely pointed out in the claims.
, In the drawings, Fig. 1 represents a pair of dividers, tothe leg A of which is secured,
construction, the ball 0., fitted H in the usual manner into a socket, b, of the pin or red B, which'in turn is loosely fitted in the bearings c c of the standard 0. Said standard is provided with a broad base, 0, having a portion of the same preferably cutaway, as shown in Figs. 1 and, 2. A crosspiece or tongue, 0
ient manner, may serve to form the bearing c. To the bottom of the base 0, I secure a shoe vent said base from slipping when placed upon any smooth surface. of such a length and so adjusted with reference to said base 0 that its point I) may, when saidbase is placed in position, be brought as near to the writin'gsurface as practicable without touching the same, as clearly shown in Fig.' 1.
In using said dividers the point b should be placed directly over the given point from which a circle or arc is to be struck or a measurement made. The base C is then held firmly against the writing-surface with one hand, while the desired circle is struck by the dividers with the other, said dividers being provided with a suitable crayon or pencil, of", for that purpose.
Instead of the ball-and-socket joint, a don ble or universal joint may be used with a like result, in which event it is essential that the rod B shall be loosely pivoted, though it is obvious that when the balljoiiit is used said pin maybe rigid with the frame or base.
,XVith this device, it is obvious that said dividers may be operated with the utmost freedom and accuracy upon any smooth or hard surface without injury thereto. Said device by means of a sleeve, a, or by any well-known Fig. 2, secured to said base 0 in any convenor plate of rubber, 0, Figs. 1 and 3, to pre-' Ihe pin B should be may be made detachable by means of a screw secured to the lower end of the sleeve; or said sleeve may be secured to the dividers by a seta pointed pin or rod forming a part of one leg of said dividers attached thereto by means of a universal joint, and supported in a frame or standard having a rubber-tipped base, a portion of which is cut away to enable said point, to be readily seen and located and maintained at will over any part of a given surface without actual contact therewith, substantially as described.
3. In an attachment for dividers, the jointed pin B, pivoted in a supporting device, 0 0, provided with a rubber plate or shoe, 0 substantially as described.
Witnesses: D. H. FLETCHER,
E. L. THURSTON.