US2789373A - Waxed marking unit - Google Patents

Description

April 23, 1957 E. FRANKL 2,789,373

WAXED MARKING UNIT Filed May 11, 1955 INVEN TOR.

Ems/:57 Fen/ml. I

{/1441 rlrra/mm ed States Patent 2,739,373 WAXED MARKING UNIT Ernest Frankl, St. Alhans, N. Y., assignor to The Stickless Corporation, New York, N. Y., a corporation of New York Application May 11, 1955, Serial No. 507,660

4 Claims. (Cl. 35-66) My present invention relates to a waxed drawing slate of the type which has generally been referred to as a magic slate and more particularly relates to an arrangement of the slate whereby material to be copied may readily be laid into the slate and traced by a stylus. Thereafter on removal of the material to be copied, the tracing on the slate will become visible.

Heretofore writing slates of this general type have been made with a base having a relatively dark background. On this base is placed a coating of wax. In face to face relation over the dark base with its wax coating is secured a relatively soft translucent sheet.

It is known that when a stylus is drawn over the translucent sheet, the portion of the translucent sheet which is pressed down by the stylus will adhere to the wax and the dark background will show through at the line "ice on which is mounted a separable light transmitting sheet with a wax coating and over the latter of which is mounted a separable translucent sheet of such nature that on stylus pressure it is adherent to the wax coating but may be pulled or separated therefrom.

The device may be utilized for ordinary writing or drawing purposes in the same manner as other magic slates but when a tracing is to be made, the material to be traced may be slipped between the dark background base and the sheet with the wax coating. This material may then be traced by a stylus on the face of the translucent sheet; and when the tracing sheet is removed, the tracing becomes visible owing to the dark or contrasting background.

The foregoing and many other objects of the invention will become apparent in the following description and drawings in which:

Figure 1 is a view in perspective showing my novel waxed drawing slate.

Figure 2 is a cross-sectional view showing my novel waxed drawing slate used for ordinary writing purposes.

of adherence. Lifting off the translucent sheet either by 1 peeling it off manually or by the use of a slide will elfec tively erase the impression by separating the translucent sheet from the wax background.

It is customary also to place over the relatively soft translucent sheet a harder transparent sheet to protect the translucent sheet. In this case, the pressure of the stylus is transmitted through the hard transparent sheet to the relatively soft translucent sheet which in turn is pressed into the wax along the line of pressure of the stylus.

My invention contemplates adding an additional trans lucent sheet with a wax coating between the relatively softtranslucent sheet and the dark background When a stylus is now pressed down on the relatively soft translucent sheet to press it against the wax coating on the additional translucent sheet, the relatively soft translucent sheet will adhere to the wax coating on the additional translucent sheet, and the combination of sheets will be substantially transparent at the line of pressure of the stylus. Thus, the additional translucent sheet with its wax coating is hingedly secured in any appropriatemann'er to a" base sheet having a dark background.

This dark background shows through at the line of pressure of the stylus. However, when it becomes desirable to trace a picture or other material, this picture or other material is laid between the dark background base sheet and the translucent sheet which carries the wax coating; The stylus may'now be passed over the outside of the unit tracing the picture or other material.

At the time the picture or other material is traced by the stylus, no apparent mark occurs, but when the picture or other material is withdrawn, the stylus pressure areas creating lines of adherence between the relatively soft ti'anslucent'sheet and the additional translucent sheet with its wax coating create substantially transparent lines through which are now visible the dark-background.-

1'. Erasure ofthe stylus tracing may now occur by lifting the relatively soft translucent sheet away from the wax coating on the additional translucent sheet.

The principal object of the present invention, therefore, is the arrangement of a waxed drawing slate in such manner that a contrasting or dark background is provided Figure 3 is a cross-sectional view showing my novel waxed drawing slate used'for tracing purposes.

Referring first to Figures 1 and 2, my novel waxed drawing slate comprises a base 10 which may have an ornamental extension or support 11 with appropriate descriptive or other material thereon. p The base 10 is preferably printed or otherwise coated to have a dark surface or at least a colored highly visible surface, that is, where the surface is colored, it'would not be colored in light or pastel tints but any bold relatively intense or dark colors.

Secured in any suitable manner to one end of the base 10 is the transparent sheet 12. One method of securement as shown in the figures is by means of the staples 13, 13 at the lower end of the waxed drawing slate. The sheet 12 is provided with a coating of wax on its upper surface 14, the said coating of wax making the sheet translucent rather than transparent.

Secured to the upper surface of the sheet 14 is the translucent sheet 15. The translucent sheet 15 is preferably secured at the end 16 of the sheet 12 opposite the end at which the sheet 12 is secured to the base 10. Various means of securement may be utilized including the staples 17. The method of securement is such' that the translucent sheet 15 may readily be pulled off of the waxed surface 14 of the sheet 12.

Over the translucent sheet 15 is secured the hard transparent sheet 18, the said transparent sheet 18 being secured to the sheet 12 by the same staples 17 which secure the sheet 15 to the sheet 12.

While I have found this arrangement of securement most satisfactory in use, it will be obvious that all of the sheets may be secured to the base by the staples 13. The advantage to be derived from this opposite securement using staples 13 only to secure the sheet 12 at the lower end and staples 17 to secure the sheets 15 and 18 to the sheet 12 at the upper end is that a sheet 20 containing material to be traced may be slipped between the sheet 12-and base 10 from the top and removed also from the top while the erasing may occur by pulling up sheets 15 and 18 from the bottom.

, When the unit is arranged as shown in the cross-sectional view of Figure 2, it will operate in the same manner as the standard waxed drawing slate. Pressure of the stylus 21 through the sheets 18 and 15 will cause the translucent relatively thin sheet 15 to adhere to the wax coating on surface 14 of sheet 12. These lines of adherence will become substantially transparent and, therefore, the dark surface of the base sheet 10 will show through to make the lines visible.

When, however, it is desired to utilize my novel wax 3 drawing stylus for tracing material on a separate sheet 20, t epar sh e .26 is laid in be a sen the shee and the base as shown particularly in the cross-sectional view of Figure 3.

\ Now the pressure ,of the stylus 21 on the surface 18 following or tracing the material on the laid in sheet 20 will cause the translucent sheet to adhere to-the wax coating on surface 14 of sheet 12 along the lines of pressure of the stylus. On removal of the sheet 20, these lines of adherence, being substantially transparent, will now be visible owing to the dark or colored surface of the base sheet 10.

Thus, if the laid in sheet ,to be traced is a white sheet with some lines, pictures or markings thereon, the tracing of these lines, pictures, or marking s by the stylus will produce no apparent result, but when the laid in sheet'20-isremoved,the traced line-Swill spring into view.

By this means, therefore, a combination waxeddrawing slateis provided which may be utilized :in a m-anner which is already well known in "the'art but which also m-ay "be utilized effectively to trace material on additional sheets, which additional sheets 'may be laid' into the device for tracing purposes and which may beremove-d fo'nviewing the result.

It will also .be understood that the underside of the intermediate .or translucent sheet can be coatedwith wax, in which case it will not be necessary to coat the upper surface of the transparent sheet. 1'

Also, the unit may be made as a combination of a wax coated transparent sheet and a translucent sheet without a base. The combination may be laid over material to be traced and then laid on .a dark surface to make the traced lines visible. Also, the combination may be used for writing or drawing without tracing, the lines being visible or vbecoming visible when the unit is laid on a dark surface.

In addition, the structure of Figures 1 to 3 may be made with sheet 12 secured on three sides to base '10 to form a pocket to removably receive material to be traced. Also, the bottom as well as the top'of sheet 15 maybe secured to sheet 12 and a vertically movable erasing slide may the mounted between.

In the foregoing the invention has been described solely in connection with specific illustrative embodiments thereof. Since many variations and modifications of the in- Yention will now be obvious to those skilled'in the art, it is preferred to be bound not by the specific disclosures herein contained but only by the appended claims.

lclaim:

1. In a waxed drawing slate, a base, the surface of said base being colored other than white, a substantially transparent sheet secured at one end to said base and oyerlying said base, a wax coating on the upper surface ofsaid substantially transparent sheet, a translucent sheet substantially overlying said substantiallytransparent sheet and secured at one end to said substantially transparent sheet, at least'a portion of said substantially transparent sheet being separable from said base, said translucent sheet being adapted to adhere to the wax coating of said substantially transparent sheet along any line of pressure imposed on said translucent sheet, said line of pressure becoming substantially transparent and the colored surface of thebase becoming visible through said line of pressure, said translucent sheet being pulla'ble from said substantially transparent wax coated sheet to erase said'line of pressure. l

2. In a waxed drawing slate, a base, the surface of said base being colored other than white, a substantially transparent sheet secured at one end to said base and over lying said base, a wax coating on the upper surface of saidsubstantially transparentsheet, a translucent sheet substantially overlying said substantially transparent sheet and secured at one end to said substantially transparent a leas .a po tion o a d substantially transparent sheet being separable from said base, said translucent sheet being adapted to adhere to the wax coating of said substantially transparent sheet along any line of pressure imposed on said translucent sheet, said line of pressure becoming substantially transparent and the surface of the base becoming visible through said line of pressure, said translucent sheet being pullable from said substantially transparent wax coated sheet to erase said line of pressure, and a second transparent sheet in surfaceto surface relation with the surface of the translucent sheet opposite the surface thereof which engages the said wax coating, said substantially transparent sheet being secured to said translucent sheet.

3. In a waxed drawing slate, a base, the surface of said base having a color other than white, a substantially transparent sheet secured at one end to said base and overlying said base, a wax coating on the upper surface of said substantially transparent sheet, a translucent sheet substantially overlying said substantiallytransparent-sheet and secured at one end to said substantially transparent sheet, at least a portion of said substantiallytransparent sheet being separable from said base, said translucent sheet being adapted to adhere to the wax coating of said substantially transparent sheet along any line of pressure imposed on said translucent sheet, said line of 'pressure becoming substantially transparent and the surface of the base becoming visible through said line of pressure said translucent sheet being pullable from said substantially transparent wax coated sheet to erase said line of pressure, and a second transparent sheet in surface-to-surface' relation with the surface of the translucent sheet opposite the surface thereof which engages the said wax coating, said substantially transparent sheet being secured to .said translucent sheet, said waxed drawing slate being adapted to receive a sheet to be traced between the first-mentioned transparent sheet and the base.

' 4. In a waxed drawing slate, a base, the surface of said base having a color other than white, a substantially transparent sheet secured at one end to said base and ou'erlying said base, a wax coating on the upper surface of said substantially transparent sheet, a translucent sheet substantially overlying said substantially transparent sheet and secured at one end to said substantially transparent sheet, at least a portion of said substantially transparent Sheet being separable from said base, said translucent sheet :being adapted to adhere to the wax coating of said substantially'transparent sheet along any line of 'pressure imposed on said translucent sheet, said line of. press e becoming substantially transparent and the surface of he base "becoming visible through said line of pressure, said translucent sheet being pullable from said substan tially transparent wax coated sheet to erase said line of pressure, and a second transparent sheet in surfa'cc to j surface relation with the surface of the translucent sheet opposite the surface thereof which engages the said wax coating, said substantially transparent sheet being secured to said translucent'sheet, said waxed drawing slate being adaptedto. receive a sheet to be traced between the first mentioned transparent sheet and the base, the transparent lines of pressure being visible against the dark surface of the base.

References Cited in the file of thispatent UNITED STATES PATENTS

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