US2779046A

US2779046A - Eraser cleaner

Info

Publication number: US2779046A
Application number: US448938A
Authority: US
Inventors: Francis J Queirolo
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-08-10
Filing date: 1954-08-10
Publication date: 1957-01-29
Anticipated expiration: 1974-01-29

Description

United tates Patent O ERASER CLEANER Francis J. Queirolo, Stoclrton, Calif.

Application August 10, 1954, Serial No. 448,938

2 Claims. (Cl. 15-310) This invention relates to improvernents in devices for Cleaning lackboard erasers, and more particularly to nn improved device of this kind which combincs coinhing and friction action with vacuum or suction action upon erasers.

The primary object of the invention is to provide a more efficient and practical time and labor-saving device of the Character indicated above which can be attached to any tank type vacuum Cleaner, is readily portahle along with the vacuum cleaner, and can, if desired, be temporarily or permanently installed on the cleaner's cart or upon any suitable support, such as a table, so that erasers present in different places in a building, as in ditferent classrooms of a school, can he cleaned thereon, instead of having to be undesirably colleeted and carried to a Cleaning area and returned to the classrooms.

Another important object of the invention is the provision of a simple and lightweight device of the Character indicated above which can be easily fabricated in a serviceable and attractive form at relatively low cost.

Other important objects and advantageous features of the invention will be apparent from the following description and the accornpanying drawings, wherein, for purposes of illustration only, a specific form of the invention is set forth in detail.

ln the drawings:

Figure 1 is a top plan view.

Figure 2 is a transverse Vertical section taken on line 2-2 of Figure 1.

Figure 3 is a fragmentary `Vertical longitudinal section taken on the line 3-3 of Figure 1.

.Figure 4- is a fragmentary and contracted side elevation showing the device mounted on a support and connected to a vacuum cleaner hose, with an eraser in Cleaning position on the device.

Referring in detail to the drawings, wherein 'like numerals designate like parts throughout the several views, the illustrated device, generally designated 7, comprises an elongated rectangular plate 8, preferably of cast aluminum, which is longer than and wider than an ordinary blackboard eraser 9, but is preferably proportioned in length and width to the length and width of the eraser 9.

The plate 8 has a fiat plain top surface 10 which is surrounded by a low wall 11 which rises from the side and end edges of the plate 8 and has a downwardly bevelled inner side 12.

Rising from the top surface 10 is a multiplicity of transverse teeth or ridges 13 which are spaced parallel from each other and form the wall 11 at the ends of the plate at distances substantially corresponding to the width of the ridges 13. The opposite ends 14 of the ridges 13 are spaced from the wall 11 along the longitudinal sides of the plate 8. The tops 15 of the ridges 13 are spaced below the top 16 of the wall 11.

A circular suction hole 17 is formed through the plate 8 at its center, and diagonal mutually divergent longitudinal grooves 18 are formed in the top surface 10 of the plate 8 and open at their inner ends, as indicated at 19, through the sidewall 20 of the hole 17. The outer ends 21 of the grooves 18 terminate outwardly of the end ridges 13 and in spaced relation to the wall 11.

As shown in Figure 1, the grooves extend through the ridges 13 where they intersect the ridges, thereby pro- ICC viding suction communication between the suction channels defined between adjacent ridges 13, and the suction hole 17.

A vacuum cleaner hose adapter, generally designated 22 comprises an annular flange 23 and an integral nipple 24, having a tapered bore 25 into which the rigid tube of vacuum cleaner hose 27 is adapted to be friction iitted.

Studs 28 traverse the adapter ange 23 and thread into the bottom of the plate At one end the plate has holes 29 in the Corners Within the wall 11 for accommodating screws 30 for inounting the device temporarily or permanently on a support Tal, as shown iu Figure 4.

The dimensions of the plate 8 are such that when an eraser 9 is positioned on the ridges 13 within the wall 11 the eraser 9 will at all times and in all positions cover the suction hole 17. It is obvious that with the vacuum Cleaner 32 Operating, suction will be present in the grooves 18 and in the spaces between the ridges 13 which will draw loose chall: from the underside of the eraser, into the vacuum Cleaner 32. By moving the eraser 9 back and forth in contact with the ridges 13 lodged chalk dust and particles will be loosened from the eraser by the combing action of the ridges and the pulling action of the suction, these combined actions serving to quickly and efliciently clean the eraser 9 of chalk accumulations.

What is claimed is:

1. In a blackboard eraser cleauer, a substantially rectangular elongated plate wider and longer than an eraser to be cleaned, said plate having a top surface and side edges and end edges, a plurality of parallel spaced continuous ridges extending across said top surface parallel to said end edges, said ridges terminating at their ends in spaced relation to the side edges of the plate, adjacent ones of said ridges defining suction channels therebetween, a plurality of relatively narrow continuous suction grooves extending lengthwise of said top surface and through the ridges at points spaced along the ridges, said suction grooves having outer ends termiuating beyond ridges at the end edges of the plate and inner ends, and a central suction hole through said plate into which the inner ends of the suction grooves open.

2. In a blackboard eraser cleaner, a substantially rectangular elongated plate wider and longer than an eraser to be cIeaned, said plate having a. top surface and side edges and end edges, a plurality of parallel spaced continuous ridges extending across said top surface parallel to said end edges, said ridges terminating at their ends in spaced relation to the side edges of the plate, adjacent ones of said ridges defining suction channels therebetween, a plurality of relatively narrow continuous suction grooves extending lengthwise of said top surface and through the ridges at points spaced along the ridges, said suction grooves having `outer ends terminating beyond ridges at the end edges of the plate and inner ends, and a central suction hole through said plate into which the inner ends of the suction grooves open, sidewalls risiug from said plate along the side edges of the plate and endwalls rising from the plate along the end edges thereof, opposite ends of said ridges being spaced from adjacent sidewalls and said endwalls being spaced from adjacent ridges.

References Cited in the file of this patent UNITED STATES PATENTS 1,416,201 Haynes May 16, 1922 1,79l,760 Kline Feb. 10, 1931 1,935,250 Palmer Nov. 14, 1933 2,163,788 Hennefer June 27, 1939 2,554,238 Burri May 22, 1951 2,655,147 Rohrer Oct. 13, 1953