US2251069A - Eraser cleaning apparatus - Google Patents

Eraser cleaning apparatus Download PDF

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Publication number
US2251069A
US2251069A US373502A US37350241A US2251069A US 2251069 A US2251069 A US 2251069A US 373502 A US373502 A US 373502A US 37350241 A US37350241 A US 37350241A US 2251069 A US2251069 A US 2251069A
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United States
Prior art keywords
cleaning apparatus
eraser
housing
cleats
disk
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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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US373502A
Inventor
Walter A Schaffer
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Individual
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Individual
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Priority to US373502A priority Critical patent/US2251069A/en
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Publication of US2251069A publication Critical patent/US2251069A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B43L21/00—Blackboard or slate cleaning devices
    • B43L21/02—Blackboard or slate cleaning devices with means for absorbing the chalk dust

Definitions

  • This invention relates to new and useful im-' chalk dust from the eraser and displace the same to a point where it cannot be readily breathed in by the person operating the apparatus.
  • Another important object of the invention is to provide an eraser cleaning apparatus of the character stated which in operation will be positive acting and in construction durable.
  • Figure 1 represents a side elevational View of the apparatus.
  • Figure '2 is a front elevational view.
  • Figure 3 is a fragmentary vertical sectional View taken substantially on line 33 of Figure 2.
  • Figure 4 is an outside elevational View of the rotor.
  • Figure 5 is an inside elevational View of the rotor.
  • Figure 6 is an edge elevational view of the rotor.
  • Figure 7 is a fragmentary perspective view of the cleaner cleats.
  • numeral 5 denotes a base upon which a motor 6 is mounted. Extending from one end of the housing of this motor '6 is an outwardly flaring shell 1 which is secured to the back wall 8 of a cylindrical housing 9 by machine screws It].
  • This housing 9 has a removable front wall ll having an opening l2 therein of a size to accommodate a blackboard eraser.
  • Numeral I3 denotes a rotor mounted within the housing 9 and which is mounted on the outer reduced end 14 of the armature shaft [5 of the motor 6.
  • the rotor [3 consists of a hub IE to one end of which is secured the substantially large disk I! and laterally from which extend blades l8 each of which at one longitudinal edge thereof is secured to or formed with the disk H.
  • the disk IT has openings [9 therethrough adjacent the hub it while on the front side of the disk and arranged in radial rows are cleats 20.
  • Each arrangement of these cleats consists of a pair of rows of these cleats 20 with the cleats of the two rows in laterally offset relation to each other.
  • An eraser cleaning apparatus comprising a housing, a drive shaft extending into the housing, a hub carried by the end portion of the drive shaft located within the housing, a disk carried by the outer end of the hub, radially disposed blades projecting from the hub and at the inner side of the disk, said disk having dust passing openings therein and provided with cleats at the outer side thereof, said housing being provided with a removable cover plate having a rectangular-shaped eraser receiving opening therein behind which pass the cleats, and a dust outlet for the housing.

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  • Cleaning In General (AREA)

Description

July 29, 1941. w. A. SCHAFFER ERASER CLEANING APPARATUS Filed Jan. 7, 1941 2 Sheets-Sheet, J,
A Norm y July 29, 1-941. 'w. A. SCHAFFER' 2,251,069
4 ERASER CLEANING APPARATUS lllllh Ill/J "ll 2 f/I/l/lly Patented July 29, 1941 UHTE STATES OFFICE 1 Claim.
This invention relates to new and useful im-' chalk dust from the eraser and displace the same to a point where it cannot be readily breathed in by the person operating the apparatus.
Another important object of the invention is to provide an eraser cleaning apparatus of the character stated which in operation will be positive acting and in construction durable.
These and other objects and advantages of the invention will become apparent to the reader of the following specification.
In the drawings:
Figure 1 represents a side elevational View of the apparatus.
Figure '2 is a front elevational view.
Figure 3 is a fragmentary vertical sectional View taken substantially on line 33 of Figure 2.
Figure 4 is an outside elevational View of the rotor.
Figure 5 is an inside elevational View of the rotor.
Figure 6 is an edge elevational view of the rotor.
Figure 7 is a fragmentary perspective view of the cleaner cleats.
Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 denotes a base upon which a motor 6 is mounted. Extending from one end of the housing of this motor '6 is an outwardly flaring shell 1 which is secured to the back wall 8 of a cylindrical housing 9 by machine screws It]. This housing 9 has a removable front wall ll having an opening l2 therein of a size to accommodate a blackboard eraser.
Numeral I3 denotes a rotor mounted within the housing 9 and which is mounted on the outer reduced end 14 of the armature shaft [5 of the motor 6. The rotor [3 consists of a hub IE to one end of which is secured the substantially large disk I! and laterally from which extend blades l8 each of which at one longitudinal edge thereof is secured to or formed with the disk H.
The disk IT has openings [9 therethrough adjacent the hub it while on the front side of the disk and arranged in radial rows are cleats 20. Each arrangement of these cleats consists of a pair of rows of these cleats 20 with the cleats of the two rows in laterally offset relation to each other.
Obviously when an eraser is placed in the opening l2 a sweeper sweeps up the cleat 20 where removed soft dust from the eraser and the soft dust can readily settle through and pass to the individual cleats 20 to reach the openings I9 through which the dust is drawn by blades 18 and expelled through the exhaust or outlet 2|.
While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.
Having thus described the invention what is claimed as new is:
An eraser cleaning apparatus comprising a housing, a drive shaft extending into the housing, a hub carried by the end portion of the drive shaft located within the housing, a disk carried by the outer end of the hub, radially disposed blades projecting from the hub and at the inner side of the disk, said disk having dust passing openings therein and provided with cleats at the outer side thereof, said housing being provided with a removable cover plate having a rectangular-shaped eraser receiving opening therein behind which pass the cleats, and a dust outlet for the housing.
WALTER A. SCHAFFER.
US373502A 1941-01-07 1941-01-07 Eraser cleaning apparatus Expired - Lifetime US2251069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US373502A US2251069A (en) 1941-01-07 1941-01-07 Eraser cleaning apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US373502A US2251069A (en) 1941-01-07 1941-01-07 Eraser cleaning apparatus

Publications (1)

Publication Number Publication Date
US2251069A true US2251069A (en) 1941-07-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
US373502A Expired - Lifetime US2251069A (en) 1941-01-07 1941-01-07 Eraser cleaning apparatus

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644189A (en) * 1950-04-12 1953-07-07 Elizabeth C Calvin Hand-supported suction brush for clothes
US2670490A (en) * 1950-09-26 1954-03-02 Gartrell William Franklin Rotary scraping brush

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644189A (en) * 1950-04-12 1953-07-07 Elizabeth C Calvin Hand-supported suction brush for clothes
US2670490A (en) * 1950-09-26 1954-03-02 Gartrell William Franklin Rotary scraping brush

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