US1928230A

US1928230A - Blackboard eraser

Info

Publication number: US1928230A
Application number: US648997A
Authority: US
Inventors: Reynolds Wellington George
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-12-27
Filing date: 1932-12-27
Publication date: 1933-09-26
Anticipated expiration: 1950-09-26

Description

Sept. 26, 1933. w. e. REYNOLDS 1,928,230

BLAGKBOARD ERASER Filed Dec. 27, 1952 INVENTOR, Wllfiyim dig/midi,

ATTORNEY.

Patented Sept. 26, 1933 UNITED STATES PATENT, OFFICE Application December 27, 1932 Serial N0. 648,997

2 Claims.

This invention relates to improvements in blackboard erasers.

An object of my invention is to provide a blackboard eraser', which will effectively clean the I blackboard and at the same time, thoroughly absorb the dry dust caused by the chalk, or crayon. It is a well known fact that the usual blackboard eraser leaves a film of dust on the board, and also produces dust in the room, when i l used dry. It is also well known that, when a sponge is used and dampened, that streaks are left on the board, which are unsightly and do not leave a clean, fresh surface. Therefore, the present invention has been designed to overcome the 1,5 objections stated.

Broadly, the present invention comprises a backing member'of stiff material, which serves as a handle, when the eraser is used. Fixedly secured to the backing member, are a plurality 2Q of strips of felt and interposed between the strips of felt, that are located near the center portion of the backing member, are strips of sponge rubber, preferably two in number, which are also secured to the backing member. These strips of .z sponge rubber project below the lower edges of the strips of felt, whereby, when the eraser is in use, the strips of rubber will engage the blackboard first, and as pressure is applied, the strips of rubber will bend sufliciently to permit the 3Q strips of felt to then engage the blackboard.

This construction serves to thoroughly clean the board with the rubber, and the strips of felt on each side of the rubber, serve to absorb the dust, when the chalk, or crayon marks are re- 35 moved by the rubber.

' Referring to the drawing:-

Fig. 1 is a perspective view of the complete eraser showing the back member of rigid material, the strips of .felt secured thereto, and the 4.0., two strips of sponge rubber, which project below the strips of felt.

Fig. 2 is an end view of the eraser, when in use, showing the sponge rubber strips being bent sufficiently to bring the strips of felt against the blackboard, and I 1 Fig. 3 is a sectional view on the line 33 of Fig. 1.

Referring to the drawing in detail: 1 designates the backing, or stiffening mem- Q ber of the eraser, which is preferably formed of felt, or fibrous material, that has been treated so as to render it rigid and against bending, when the eraser is in use. 2, 3, 4 and 5 designate strips of felt of substantial thickness, as shown, that are cemented, or otherwise secured to the backing member 1, as indicated at 6. The backing member is formed of rigid felt material and, therefore, provides a suitable material for securely cementing the strips of felt 2, 3, 4, and 5 and the strips, 7 and 8, of sponge rubber. The-strips of sponge rubber are located between the strips of felt, 3 and 4.

It will be noticed that the lower edges 9 of the strips, '7 and 8, of sponge rubber, project materially below the lower edges 10 of the strips of felt. This projecting portion is indicated at 11. By having the strips of sponge rubber project below the strips of felt, it provides a structure that closely contacts with the surface of theblackboard, indicated at 12. The sponge rubber possesses the property of closely adhering to the blackboard, when pressure is applied to the eraser, thus effectively removing thecrayon, or'chalk marks, from the board. As shown in Fig. 2', the strips of sponge rubber bend or yield, as shown, which results in bringing the strips of felt directly against the surface 12 of the blackboard, which will absorb any dust that is raised by the action of the rubber strips. The eraser, therefore, serves the double purpose of thoroughly cleaning the blackboard and absorbing the dust.

It is to be understood that the eraser, when moved in the opposite direction, will bring the oppositely located edges 11 against the surface of the blackboard, so that the strips of felt alternately take up the dust, as the eraser is reciprocated.

It is also to be understood that it may be used either wet or dry.

While I have shown and described the backing member 1 of rigid felt material, other suitable material may be used and preferably one that permits attaching the felt and rubber strips thereto.

What I claim is:-

1. A blackboard eraser comprising a rigid handle member of fibrous material free from any openings, a plurality of felt strips having a side thereof secured near to the opposite side the back member, a plurality of sponge rubber strips having a side edge thereof secured to the back member, located intermediately of the felt strips and projecting laterally outwardly of the outer edges of the felt strips, whereby the strips of sponge rubber will flex or bend when in use to permit the felt strips to engage the blackboard and form spaces between the rubber and felt strips to absorb any dust, as described.

WELLINGTON GEORGE REYNOLDS.