US3497970A - Tracing board - Google Patents

Tracing board Download PDF

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Publication number
US3497970A
US3497970A US750296A US3497970DA US3497970A US 3497970 A US3497970 A US 3497970A US 750296 A US750296 A US 750296A US 3497970D A US3497970D A US 3497970DA US 3497970 A US3497970 A US 3497970A
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US
United States
Prior art keywords
bag
mass
weight
grease
board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US750296A
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English (en)
Inventor
Miron Padowicz
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Individual
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Individual
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/12—Repeatedly-usable boards or tablets for writing or drawing having translucent writing surfaces producing visual impressions by co-operation with backing members
    • B43L1/123—Flexible writing surface or backing
    • B43L1/126—Flexible writing surface or backing withinterposed adhesive substances

Definitions

  • a deformable mass of shape-retentive character i.e. a mixture of mineral oil or low-viscosity, high-penetration grease with a thickener constituted by a wax, a metal soap or a high-viscosity mineral-oil grease in the presence of a small proportion of a coloring agent
  • the oil or lowviscosity grease
  • Another object of this invention is to provide a tracing board of this type in which the background may be readily replaced by one having a different color or pattern.
  • my invention aims at providing a simple and inexpensive device which teachers, students, artists and other persons may use for creative work, relaxation or communication.
  • a tracing board which comprises a flattened bag of flexible and preferably transparent material, advantageously a thermoplastic substance such as polyvinylchloride or polyethylene, filled with a permanently fluid viscous mass of opaque coloration, this mass forming a moldable body which may also act as a displaceable masking agent on a contrasting background provided by a base underlying the transparent bag.
  • a thermoplastic substance such as polyvinylchloride or polyethylene
  • the mass within the bag consist predominantly of a grease mixture of at least two components, one of which is a low-viscosity, high flowability component and is present in an amount ranging between 15 and 50% by weight, the other being a thickening or high-viscosity, low-flowability component.
  • the grease mixture may constitute up to 96% of the composition.
  • the low-viscosity component is a mineral oil
  • it may be present in a proportion of 16 to 24% by weight of the composition so that it preferably accounts for about one-fifth of the total mass, the balance being a thixotropic thickener, such as a wax or a metal soap, and a colorant such as carbon black present in a minor proportion of or more as indicated below.
  • the low-viscosity substance may be a lime-based mineral-oil grease while the high-viscosity substance is a chemically similar lime-based mineral-oil grease of lower fiowability.
  • the two components may be present in substantially equal parts by weight.
  • the thickener may also be a product chemically similar to the oil.
  • a mixture in the proportions given or up to equipoise (50%- 50% of two greases having low penetration value (e.g. 220 to 250 under ASTM standard D217 or German Industrial Standard DIN 51804) and high penetration value (e.g. 265 to 295 under ASTM D217), respectively, may be used as a grease mixture, in an amount ranging up to about 96% by weight, in the moldable and shapable composition together with the pigment (up to 5% by weight).
  • the front wall of the bag may be pressed against the rear wall at selected locations whereby the viscous filling is squeezed aside and the underlying background is directly exposed to view.
  • the base-or part thereof may be removably held in a frame engaging the bag.
  • this base may consist of a plate-shaped support rigid with the frame and an adjoining sheet which can be withdrawn through an open side of the frame and whose surface confronting the bag may bear a color or pattern different from that of some other background-forming sheet adapted to be substituted therefor.
  • FIG. 1 is a perspective view (parts broken away) of a tracing board according to the invention.
  • FIG. 2 is a cross-sectional view taken on the line 11-11 of FIG. 1.
  • the device shown in the drawing comprises a frame 6 which accommodates a rigid support plate 1, a background-forming sheet 2 removably fitted in front of plate 1 and shown in FIG. 1 in a partly withdrawn position, at antifriction layer 9 of transparent sheet material disposec' forwardly of the base 1, 2, and a flattened bag 3 of flexible transparent thermoplastic material extending across the front of the frame.
  • Bag 3 whose rear and front walls have been designed 3', 3" in FIG. 2, is filled with a viscous greasy mass 4 of dark color, specifically a mixture 01 mineral oil with a metal soap and/or a wax to which z carbonaceous pigment has been added in a suitable blend er. With the oil present in the proportions indicated above the bag is readily deformable but of surprising three dimensional stability at room temperatures.
  • a simple T-shaped tool 7 witl broad and narrow ends may be manually displaced across the front wall 3" of bag 3 to create a bright trace 7' by displacing the mass 4 from the region onto which pressure has been exerted by the tool; one of the pointed end: of the tool may be similarly used to produce a much nar rower trace.
  • the thin and substantially completely trans parent grease film remaining between the walls 3, 3 causes the walls to adhere to each other so as to retair the shape last given to the bag by the tool 7. It may be noted in this connection that the walls 3', 3" need no necessarily consist of the same transparent material.
  • tht mass 4 may be selectively accumulated in some area l1( give rise to a bulge 3a in the front wall 3", this bulg having of course the same dark appearance as the re manider of the bag at any point where the two walls 3' 3" have not been forced into adhesive contact with each other.
  • Bulge 3a may be sculptured into any desired protruding shape and, of course, may also be subdivided into several smaller bulges separated by flattened bag portions through which the light background is visible.
  • the sheet 2 may be white, colored or variegated and, if desired, may be replaced by some other sheet of different color and/or pattern; a tab 2 facilitates its withdrawal from the frame 6.
  • the antifriction layer 9 may be connected with the frame 6 by heat-sealing, cementing, clamping or other means. Its front surface, contacting the rear wall 3' of bag 3, may be suitably greased to facilitate contractions or expansions of the bag and to relieve local stresses within the wall 3'. In a simplified device, however, layer 9 could be omitted and bag 3 may rest directly against the base 1, 2. Furthermore, the desired background could also be provided directly by the front surface of support plate 1, with omission of the sheet 2.
  • the mass 4 should be reasonably stable over a substantial temperature range, e.g. from 20 C. to +50 C. It may be composed, for example, of 75% (by weight) of ceresin wax or calcium stearate, 20% of mineral oil and 5% of carbon black. If greater viscosity is preferred, the proportion of mineral oil should be reduced, particularly at higher ambient temperatures; in cooler surroundings it may be somewhat increased. The range of 16 to 24% of the total, by weight, or between about 20 and 30% of the thixotropic additive, has been found suitable under virtually all practical conditions of use.
  • the proportion of carbon black or other colorant is not critical for the shape retentiveness of the mixture; if opacity is not a factor, as when the bag 3 is not transparent, the pigment may be entirely omitted, a reasonable upper limit being about half the weight of the oil.
  • amixture of great stability and shape retentiveness is a mixture of equal parts by Weight (50%-50%) of two lime-based mineral oil greases having Work penetrations at 25 C. of 265-295 and 220-250, respectively, as determined by ASTM. standard D217 and German Industrial Standard DIN 51804.
  • the first grease has a sulfate-ash content of 4.2% and a water content of 0.6-0.9% whereas the sulfate-ash content of the second grease is 4.6% and the water content 0.7-1%.
  • the chloride content of both greases is less than 0.01% and the neutralization number is 0.2-0.6 mg. KOH/ g.
  • a tracing board comprising a flat base forming a distinctive background, a flattened bag of flexible material overlying said base, and an antifriction layer of trans parent sheet material interposed between said bag and said base, said bag being filled with a permanently deformable mass of shape-retaining character at room temperature and selectively displaceable by the exertion of pressure upon an exposed wall portion of said bag, said mass being essentially a greasy mixture of a first component of low viscosity with a second component of high viscosity, said first component being present in an amount of 15 to 50% by weight of said mass, said greasy mixture constituting up to by weight of the mass, a frame securing said bag to said base, said base including a support permanently fixed to said frame and a backgroundforming sheet removably interposed between said support and said bag.
  • thermoplastic substance is polyvinylchloride or polyethylene.
  • a board as defined in claim 5 wherein said mass comprises a grease mixture making up the balance of said mass, said grease mixture consisting of substantially equal parts by weight of two lime-based mineral oil greases, one of said greases having a work penetration of 220 to 250 at 25 C. under ASTM Standard D217, and the other of said greases having a work penetration of 265 to 295 at 25 C. under ASTM Standard D217.

Landscapes

  • Laminated Bodies (AREA)
  • Toys (AREA)
  • Lubricants (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Signs Or Road Markings (AREA)
US750296A 1964-12-24 1968-08-05 Tracing board Expired - Lifetime US3497970A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEP24588U DE1912820U (de) 1964-12-24 1964-12-24 Tafel fuer ausloschbares malen, zeichnen und formen.
BE658247A BE658247A (fr) 1964-12-24 1965-01-13
FR2757A FR1430339A (fr) 1964-12-24 1965-01-21 Tableau pour peinture, dessin et modelage effaçables
DEP31342A DE1259749B (de) 1964-12-24 1965-03-06 Tafel fuer ausloeschbare Malerei

Publications (1)

Publication Number Publication Date
US3497970A true US3497970A (en) 1970-03-03

Family

ID=41452712

Family Applications (1)

Application Number Title Priority Date Filing Date
US750296A Expired - Lifetime US3497970A (en) 1964-12-24 1968-08-05 Tracing board

Country Status (6)

Country Link
US (1) US3497970A (fr)
BE (1) BE658247A (fr)
DE (2) DE1912820U (fr)
DK (1) DK126488B (fr)
FR (1) FR1430339A (fr)
GB (1) GB1080097A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798782A (en) * 1971-10-18 1974-03-26 R Lindahl Register mark punch system and method
FR2473957A1 (fr) * 1979-08-22 1981-07-24 Rhone Poulenc Syst Film mate pour ardoises a effacement instantane
US4354845A (en) * 1980-11-24 1982-10-19 Poteet Ronald J Identification structure for games and educational use and for other use
US4761139A (en) * 1985-06-18 1988-08-02 Gideon Mashiach Drawing board type amusement device
US7568916B1 (en) * 2004-09-09 2009-08-04 Wilco R. Stuhmer Drawing apparatus and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010001082U1 (de) 2010-01-19 2010-06-02 Christl, Elisabeth, Dr. Sandtisch für therapeutische Zwecke

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB343742A (en) * 1930-02-19 1931-02-26 William Thomas A new writing tablet
US2487690A (en) * 1947-01-24 1949-11-08 Goss K Black Perspective aid device
CA689870A (en) * 1964-06-30 E. Watkins Herbert Finger painting device
US3279100A (en) * 1964-04-02 1966-10-18 Philip H Knott Exhibitor of informative markings removably applied by pressure to a display surface thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE380484C (de) * 1922-08-31 1923-12-15 Sally Floerscheimer Schreibgeraet mit durchscheinendem Blatt
DE409244C (de) * 1923-07-23 1925-02-03 Hermann Deutsch Schreib- und Zeicheneinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA689870A (en) * 1964-06-30 E. Watkins Herbert Finger painting device
GB343742A (en) * 1930-02-19 1931-02-26 William Thomas A new writing tablet
US2487690A (en) * 1947-01-24 1949-11-08 Goss K Black Perspective aid device
US3279100A (en) * 1964-04-02 1966-10-18 Philip H Knott Exhibitor of informative markings removably applied by pressure to a display surface thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798782A (en) * 1971-10-18 1974-03-26 R Lindahl Register mark punch system and method
FR2473957A1 (fr) * 1979-08-22 1981-07-24 Rhone Poulenc Syst Film mate pour ardoises a effacement instantane
US4354845A (en) * 1980-11-24 1982-10-19 Poteet Ronald J Identification structure for games and educational use and for other use
US4761139A (en) * 1985-06-18 1988-08-02 Gideon Mashiach Drawing board type amusement device
US7568916B1 (en) * 2004-09-09 2009-08-04 Wilco R. Stuhmer Drawing apparatus and method

Also Published As

Publication number Publication date
DE1912820U (de) 1965-03-25
BE658247A (fr) 1965-04-30
GB1080097A (en) 1967-08-23
DK126488B (da) 1973-07-23
FR1430339A (fr) 1966-03-04
DE1259749B (de) 1968-01-25

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