US1624538A - Magnetic stencil and work holder - Google Patents

Description

Appilv ,1927.

H. G. GRAIN MAGNETIC STENCIL AND WORK HOLDER Filed July 15.v 192s Patented Apr. 12, 1927.

g I 1,624,538. UNITED STATES PATENT OFFICE.

HARRY G. GRAIN, OF CANISTEO, YORK, ASSIGNOR F ONE-HALF TO JOHN P. LAIR,

' OF CANISTEO, NEW YORK.

MAGNETIC STENCIL AND WORK HOLDER.

Application filed July 15, 1926. Serial No. 122,718.

This invention relates to magnetic stencil and Work holders, and belongs particularly tothe type or class of devices for holding iron or other material which has been so treated that it can be attracted and held by magnetism when made up in the form of a stencil. The object of this invention is to provide a magnetic holder that will attract strongly and 'firmly press all portions and lines of the stencil on the work, especially atthe edges of the stencil in order that none of the fluid applied may creep under the ,edges of the stencil and prevent a clear, clean line of demarcation. Such stencils and this invention may be used upon any material which. may be coated,-lettered or decorated with paint, varnish, lacquer or other liquid or partly liquid coating, by hand brushing, air brushing, spraying or other method for applying the same. It may be used for applying pigment or colors of various kinds of fusible materials which have been colored to any desired shade, and which may be applied as paste, powdered enamel or glass or other like substances which upon being fused become sufliciently fluid to be applied adherently to the material acted upon. The purpose is to form letters, figures, decorations and the like, and is intended primarily for use in the manufacture of signs, or upon articles displayed.

This invention consists of magnets, usually electromagnets having pole pieces of special construction and arrangementas illustrated in the accompanying drawings making a part of this application. Figure 1 of the drawings represents a top plan view showing the usually preferred shape and disposition of the pole pieces. Figure 2 is a 40 cross-section on the broken line 22 of Figure 1.

Throughout the the same number is used to refer to the same part.

Considering the drawings, numeral 1 marks a soft iron box-like magnet, having pole pieces 2 projecting and spaced apart inwardly at the top of the side or end. of

the box. The divisions 3 are legs of the magnet and have the pole pieces 4 projecting upon opposite sides and spaced apart as shown.

Cores 5 provided with laterally projecting pole pieces 6 at the top are surrounded with thecoils 7. The cores 5may be secured side description and drawingsby side to the bottom of the box 1 by screws 8 or in any convenient manner.

It will be noted that the outer or uppermost surfaces of the pole pieces all lie in the same plane, affording a supporting surface for the work 9, upon which rests the stencil 10 of magnetic material. The stencil introduces a path for the lines of magnetic polarization between opposite poles and pole pieces of the magnet, and it will be observed that the pole pieces are arranged near together with the object of making the magnetic effeet as strong as possible, in order that all the edge portions of the stencil 10 may be tightly held in continuous contact with the work 9. i

It will be understood that this invention is not limited to any special size of the magnet or to the particular form of the pole pieces illustrated which may clearly be varied within the purview of the appended claims. Nor, is it intended to confine thisv invention to a magnet whereof the poles or pole pieces lying in the same plane constitute a fiat surface upon which the material to be marked is held. The surface may clearly be curved if demanded by any considerable amount of work demanding the construction of a special holding surface for the work. -The construction herein shown and described is found in practice to successfully attain the object stated, which is to strongly hold the stencil body and edges at all poi ts closely upon the work, thereby preventing the marking fluid whatsoever it may be from creeping and acting against the formation of a sharp,-clean edge to the matter stencilled.

Having now described this invention and explainedthe mode of its operation, what I claim is 1. In a magnetic stencil and work holder, the combination with electro-magnets provided with off-set pole pieces formed with alternately projecting and recessed portions, the projecting portions of the pole pieces of one magnet arranged in the recessed portions of the pole pieces of the adjacent magnet, L

the said pole pieces being disposed near each other to create a strong magnetic field, and theouter surfaces of the said pole pieces being located in the same plane to provide a surface for holding the work to be stencilled. 2. In a magnetic stencil and work holder, the combination with an electro-magnet ha"- having pole pieces constructed with alter,- nately projecting and recessed portions on op osite sides, the projecting portions of the po e pieces of the magnets and the sides of said box extending into the recessed portions of the pole pieces of the adjacent magnet, the

said pole piecesbeing located near each other to create a strong magnetic field, and the outer surfaces of the said pole pieces being arranged in the same plane to provide a surface for holding the work to be stencilled.

In testimony whereof I afiix my signature.

HARRY G. GRAIN.

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