US3509644A - Self-cleaning blackboard - Google Patents

Self-cleaning blackboard Download PDF

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Publication number
US3509644A
US3509644A US741037A US3509644DA US3509644A US 3509644 A US3509644 A US 3509644A US 741037 A US741037 A US 741037A US 3509644D A US3509644D A US 3509644DA US 3509644 A US3509644 A US 3509644A
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United States
Prior art keywords
writing surface
self
writing
panel
magnetic
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Expired - Lifetime
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US741037A
Inventor
Michael P Santell
Richard E Powers
Steven F Claus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MICHAEL P SANTELL
RICHARD E POWERS
STEVEN F CLAUS
Original Assignee
MICHAEL P SANTELL
RICHARD E POWERS
STEVEN F CLAUS
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Application filed by MICHAEL P SANTELL, RICHARD E POWERS, STEVEN F CLAUS filed Critical MICHAEL P SANTELL
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/008Repeatedly-usable boards or tablets for writing or drawing with magnetic action

Definitions

  • a fixed vertical writing surface of a plastic material has a backing of any suitable material, and behind said backing is a sheet of magnetic material such as Koroseal adhesively fixed to a top hinged sheet of rigid material.
  • Ferrous material is applied to the writing surface by a writing implement and is retained in written form by the adjacent magnetic attraction, and when erasure is desired a lever or cord is used to move the magnetic sheet away from the writing surface. Removal of the magnetic attraction thus drops the ferrous material into a trough under the writing surface for reclamation and subsequent use.
  • FIG. 1 is a vertical cross-sectional view taken from the side of a board assembly embodying the invention.
  • FIG. 2 is a view in perspective of a self-erasing board assembly.
  • FIG. 3 is an enlarged fragmentary vertical cross-sectional view of the board elements in writing position.
  • FIG. 4 is a similar view of the rear panel in retracted position.
  • FIG. 1 a back panel is shown, 10, attached to wall 11, with a bottom 12 and top 13 fronted by the frame element 14 and a plastic writing surface 15 adhesively or otherwise attached to the fixed panel 16.
  • a rear panel 3,509,644 Patented May 5, 1970 17 is hinged at 18 of the top element 13 and is frontally covered by the magnetic sheet of Koroseal 19.
  • the writing implement 20 applies ferrous material or shredded magnetic tape 21 to the writing surface where it is retained in form by the magnetic force of the Koroseal 19.
  • a handle 22 attached to cord 23, in turn engaged about the pulley 24 and tethered at 25 to the lower portion at the rear of panel 17 may be pulled to remove the magnetic force by withdrawing the Koroseal from proximity to the Writing surface 15, allowing the material 21 to drop into a trough 26 from which it may be reclaimed for subsequent use.
  • a self-erasing blackboard including a fixed writing surface, a panel coextensive in area with said surface disposed behind said writing surface and hinged at its top to lie in close proximity with and to be displaced away from said writing surface, a magnetic sheet on the frontal surface of said hinged panel, means for writing with ferrous material on the writing surface, and means for withdrawing the hinged panel and magnetic sheet from proximity to said writing surface to free the ferrous material for subsequent use.
  • a device as in claim 1 including a backing fixed rearwardly of said writing surface sheet, and said means for withdrawing the hinged panel and attached magnetic sheet is a cord puller.

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  • Drawing Aids And Blackboards (AREA)

Description

May 5, 1970 M P. SANTELL ET AL SELF-CLEANING BLACKBOARD Filed June 28, 1968 'NVENTOBE:
M/a/ma 1. 5.4117644 E/cH/azoE.Pan draws F. 6420 9 QMAMPQLQM Bv ATTORNEY United States Patent SELF-CLEANIN G BLACKBOARD Michael P. Santell, 5545 S. 106th St., Hales Corners, Wis. 53130; Richard E. Powers, 6098 N. Hopkins St., Milwaukee, Wis. 53209; and Steven F. Claus, 1509 Manitowoc St., South Milwaukee, Wis. 53172 Filed June 28, 1968, Ser. No. 741,037
Int. Cl. B43] 1/00; G091? 7/04 US. Cl. 35-66 2 Claims ABSTRACT OF THE DISCLOSURE An immobile blackboard writing surface and a magnetic sheet on a top hinged panel behind it, whereby a ferrous material can be applied in writing on said writing surface and will remain thereon until the magnetic sheet is pulled out of magnetic range, whereupon the ferrous writing material will fall into a receptacle from which it may be reclaimed.
BRIEF SUMMARY OF THE INVENTION A fixed vertical writing surface of a plastic material has a backing of any suitable material, and behind said backing is a sheet of magnetic material such as Koroseal adhesively fixed to a top hinged sheet of rigid material. Ferrous material is applied to the writing surface by a writing implement and is retained in written form by the adjacent magnetic attraction, and when erasure is desired a lever or cord is used to move the magnetic sheet away from the writing surface. Removal of the magnetic attraction thus drops the ferrous material into a trough under the writing surface for reclamation and subsequent use.
FIG. 1 is a vertical cross-sectional view taken from the side of a board assembly embodying the invention.
FIG. 2 is a view in perspective of a self-erasing board assembly.
FIG. 3 is an enlarged fragmentary vertical cross-sectional view of the board elements in writing position.
FIG. 4 is a similar view of the rear panel in retracted position.
DETAILED DESORIPTION In FIG. 1, a back panel is shown, 10, attached to wall 11, with a bottom 12 and top 13 fronted by the frame element 14 and a plastic writing surface 15 adhesively or otherwise attached to the fixed panel 16. A rear panel 3,509,644 Patented May 5, 1970 17 is hinged at 18 of the top element 13 and is frontally covered by the magnetic sheet of Koroseal 19. The writing implement 20 applies ferrous material or shredded magnetic tape 21 to the writing surface where it is retained in form by the magnetic force of the Koroseal 19. To erase, a handle 22 attached to cord 23, in turn engaged about the pulley 24 and tethered at 25 to the lower portion at the rear of panel 17 may be pulled to remove the magnetic force by withdrawing the Koroseal from proximity to the Writing surface 15, allowing the material 21 to drop into a trough 26 from which it may be reclaimed for subsequent use.
It will be understood that the device is capable of many modifications in structure and design, without departing from the spirit of the invention, within the scope of the appended claims.
Having thus described the invention, what is claimed and desired to be secured by Letters Patent of the United States is:
1. A self-erasing blackboard including a fixed writing surface, a panel coextensive in area with said surface disposed behind said writing surface and hinged at its top to lie in close proximity with and to be displaced away from said writing surface, a magnetic sheet on the frontal surface of said hinged panel, means for writing with ferrous material on the writing surface, and means for withdrawing the hinged panel and magnetic sheet from proximity to said writing surface to free the ferrous material for subsequent use.
2. A device as in claim 1, including a backing fixed rearwardly of said writing surface sheet, and said means for withdrawing the hinged panel and attached magnetic sheet is a cord puller.
References Cited UNITED STATES PATENTS 1,881,140 10/1932 Settel 66 2,746,172 5/1956 Crow -1 35-19 3,093,919 6/1963 Holtz 142 EUGENE R. CAPOZIO, Primary Examiner H. S. SKOGQUIST, Assistant Examiner
US741037A 1968-06-28 1968-06-28 Self-cleaning blackboard Expired - Lifetime US3509644A (en)

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US74103768A 1968-06-28 1968-06-28

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US3509644A true US3509644A (en) 1970-05-05

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172333A (en) * 1977-08-30 1979-10-30 Towsend Marvin S Writing and display apparatus
US4288936A (en) * 1978-10-16 1981-09-15 Pilot Man-Nen-Hitsu Kabushiki Kaisha Wall-hanging type magnetic displaying device
US5018979A (en) * 1989-11-16 1991-05-28 The Ohio Art Company Magnetic visual display
US5295837A (en) * 1989-11-16 1994-03-22 The Ohio Art Company Magnetic visual display
US5419706A (en) * 1993-06-22 1995-05-30 Levy; Richard C. Apparatus for forming images of non-visible elements underlying an opaque surface
US6416329B1 (en) * 1999-08-13 2002-07-09 Kyowa Electric And Chemical Co., Ltd. Writing device for practice in writing characters
CN105942739A (en) * 2016-06-20 2016-09-21 南京工业职业技术学院 Self-cleaning blackboard cabinet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1881140A (en) * 1929-11-23 1932-10-04 Settel Benjamin Memorandum pad
US2746172A (en) * 1954-01-22 1956-05-22 Leonard R Crow Magnet holding block
US3093919A (en) * 1957-11-18 1963-06-18 Hermann J Holtz Magnetic display arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1881140A (en) * 1929-11-23 1932-10-04 Settel Benjamin Memorandum pad
US2746172A (en) * 1954-01-22 1956-05-22 Leonard R Crow Magnet holding block
US3093919A (en) * 1957-11-18 1963-06-18 Hermann J Holtz Magnetic display arrangement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172333A (en) * 1977-08-30 1979-10-30 Towsend Marvin S Writing and display apparatus
US4288936A (en) * 1978-10-16 1981-09-15 Pilot Man-Nen-Hitsu Kabushiki Kaisha Wall-hanging type magnetic displaying device
US5018979A (en) * 1989-11-16 1991-05-28 The Ohio Art Company Magnetic visual display
US5112229A (en) * 1989-11-16 1992-05-12 The Ohio Art Company Magnetic visual display
US5295837A (en) * 1989-11-16 1994-03-22 The Ohio Art Company Magnetic visual display
US5419706A (en) * 1993-06-22 1995-05-30 Levy; Richard C. Apparatus for forming images of non-visible elements underlying an opaque surface
US6416329B1 (en) * 1999-08-13 2002-07-09 Kyowa Electric And Chemical Co., Ltd. Writing device for practice in writing characters
CN105942739A (en) * 2016-06-20 2016-09-21 南京工业职业技术学院 Self-cleaning blackboard cabinet

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