US2394139A - Erasing attachment for typewriters - Google Patents

Description

T Feb. 5, 1946. I c. R. BENNETT ERASING ATTACHMENT FOR II'YPEWRI'IERS Filed March 27, 1944 mm F CHARLES' R. BENNETT INVENTOR ATTORNEYS Patented Feb. 5, 1946 U'NITED p STATE 4 TYPEWRITERS r I Charles R. Bennett, East Qleveland, Ohio v .7

Application March 27, 1944, Serial Nor 528.291

e claims. (or; 197-181) This invention relates to erasing attachments for typewriters and more particularly relates to an erasing attachment Which is key operated.

One of the objects of the invention is .to provide a simple and effective erasing device which which is provided with an-erasing head anda rel- .atively movable erasing means operable upon impact of the head with the platen and the sheet of paper carried thereon to'cause the erasing means to movably engage the surface of the paper under pressure sufiicient to remove any undesirable characters from the surface of the paper engaged by the eraserr Another object'of the invention is to provide a typewriter erasing attachment with means whereby the device may be so mounted that upondepression of the actuating key, the erasing element will move into proper alignment or position to strike the platen uponlthe character to b erased,

Other objects and advantages of my invention will become more apparent from thefollowing description of an embodiment thereof reference being made to the accompanying drawing in which like reference characters are employed to designate like parts throughout the same.

In the drawing:

Figure 1 is a plan view of my invention shown applied to a typewriter, the latter being shown only in outline for purposes of illustration;

Figure 2 is an enlarged plan view of a device embodying my invention and shows the erasing elements or scrapers in erasing engagement with the paper on the platen when the eraser key is depressed; i I i l Figure 3 is a front view of the eraser, head looking to the right at Figure 2; and,

Figure 4 is a view similar to that of Figure 2 but illustrates the relation of the parts when the head iswithdrawn to the broken line position in Figure 1. t

Referring now more particularly to the drawingin which I have illustrated one embodiment of the invention, a typewriter is indicated generally at I and is provided with the usual platen! for receiving a'sheet of paper in the usual manner on which characters are to be typed.

In carrying out my invention .Ihave provided n arm g pivoted at A to the frame of theitypewriter to swing ina substantially horizontal plane toward and away from the platen 2. The rear endof the arm is formed with a projection 5 apertured at 6 to receive the looped end of a link 1 which is connecteda't its iother end 8 with a rocking lever 9 pivotally mounted on a boss in formed on the frame I .'"'A coiled springl connects the typewriter frame withthe mid portion ofthelinkatll. y v j A key l3 on the key arm hin ed at E5 is also connected with the rockinglever 9 by means of a link I6 so that when the key is depressed; motion will be transmittedthrough the linkage l and I 6' and the rocking lever 9 to swing theeraser arm 3 about'its pivot '4' to thefull line position shown in-Figure 1,that-is',to impact'th'e eraser element carried, bythejeraser head H, with the platen 2.7 I I Referring now more particularly to'Figures 2, 3 and 4, I will describe the'construction and operation of theeraser device carried by the arm 3. A head I! is formed on the outer end of the arm and comprisesa pair of parallel side walls I 8 and I9 spaced apart andgrooved internally at 20 to provide a guide way for the plunger 2! which is adapted to slide along the guide way in either direction. The plunger-is normally urged-upwardly. as in Figuredby thelcompression spring 22 whichmay be interposed between the movement thereofin both directions.

the bottom wall 23' of the guide way and the bottom surface of the plunger 2| as shown in Figure 2. The upper portion or the plunger, which is substantially U shape, is formed with a pair of guards or stops 24, the outer end surfaces of whichengage thepaper on the platen 2 when the key. 13 is depressed. Atransverse bar 25 is spaced below the guards 24c and is provided as a horizontal support for the eraser belt 26 over which the latter passes or'slides as the device is operated. I v w -Adjustably securedto one outer side of the head l'| is a rack 21 along which the pinion 28 carried by the eraser wheel 29 travels, the wheel 29 and the pinionrotating together as a unit. It will be seen that the eraser wheelie rotates within the U shaped plunger, the wheel shaft 30 being rotatably mounted in the arms, of the plunger and extending outwardly thereof on both sides and through the elongated slots 3| and 32 formed in the parallel sides of the head l1. These slots serve to further guide the movement of the plunger in the head and also act to limit- One end of the Wheel shaft 30" carries the pinion on the outer side of the-adjacent head side wall 18 so that the teeth of the pinion may engage the teeth of the'rack as shownin Figure 2.

The erasing element consists of a belt 25 overlying and anchored at one point to the periphery of the wheel 29, the belt also being threaded over the belt bar 25 as previously explained. .A' plurality of abrasive, scraping orv cutting members 3| is carried by the belt and are so arranged that the efiectiveabra sive, scrap ing or cnttinggareasior surfaces thereof pass beitween the guards 24" and sufficiently beyondtlie.

outerconfines thereof to efiectively engage the paper on the platen 2 for the purposes explainedwhen the key I3 is depressed as showniinjifigs ures 2 and 4.

the plunger upwardly. in the head; the erasing elements 3| will be positioned:,ta-themightsofi the:

plunger as in Figure 4 ready to be driven across and in contact with the paper area tobe-erased- Since the spring 22 normally tends to project.

' I claim:

1. In a key operated erasing attachment for a typewriter having a platen, an eraser element,

a swinging carrier for the eraser, said eraser element being movable in the carrier in a direction substantially parallel to the axis of the platen in response to an impact blow delivered by the carrier to the. platen, and key operated means to swing said carrier against the platen to deliver aniimpact;blomthereagainst andgeared means responsive tothe force o'fsaid' impact to drive the eraser element into erasing contact with and across the area to be erased.

2: A: key--pperated erasing attachment for a trpewriter comprising an arm, key operated means to impel. said arm toward the platen of'the-typewriter, a plunger slidable on said arm and normally; projecting therefrom, erasing means movably carried by said sliding means, a

upon a downwarmmovement orthenl n er due V p to. i'rnpactbf the guard. with. the. platen. As the 1 plungerisforced; backiinto the.head as in Fig-,-

ure 2 against. the. compression of the spring; 22, the; pinion 28 will; travel. along, the: rack. and. 'suchgmovement;wilLrotatetheeraser Wheel ;2-9,.in

a. countereclockwise'. direction, .thus bringing th'e erasing elements. across; and. between -.-theguides 24' and at the same time in efiectiveerasing .0011.- I tactwith: that. portion-.of the-paper Which lies within. thetype space.32:andwhiohcontainsa character tobe erased...

While -I have shown; theerasing; elements 311 as comprising. blades for. scrapinggthepaper surface during, the; erasing; operation, it is 130;136, underv stood that in place-of the .--blades;3-l; abrasive.- or

rubbing. members may; be. employed withsequally efiective results. As the; head is. retractedorr moved away; vfrom the platem partly by the force of: the spring 22 and also-with the aid-of spring: lhthe plunger 21 and; thezerasingl; wheel 2.9 carried. thereby will beiprojectediupwardly-and outwardlyoffthe head as indicated. in Figure; 4'; in: position: for: the; next impact. blow-against; the. platen; Of: course, as-

the head: I 1V and the; arm:;3 move away from: the platenwtoward. the; broken line: position in .l Figure ly theikey' I 3 will .returnto its :former upper. position,. suchwmotionzofi theaarm Kbeing transmitted through thezlinkss'l and I6: and the rocking? lever 10 to-the key balt'lfiz. V y

Erom the foregoing description: and the.- drawing it will; be seenthat' by. my .inventon T have provided. an: eraser: attachmentziortypewriters which. is: ofi extremely: simple construction and positive: inzvoperation and -that': the same-is: as

easy=to operate as anyotherkey on the keyboard,

thezann 3iis swung toward the platento' engage the guards 24 with the platen in the type space 33? under" atsufiiciently sharp impact blow to cause: thezextend'ed plunger it to be telescoped rearwardly in the" headl'l suchmovement of thescone.ofrtheefollewinggclaims; a

rack; carried by said arm and a pinion carried by, said plunger: and engaging said rack: to actuate; saiderasing. means-upon; a-movement, of the plunger out. of its.. normallyproiected p sition in. response. team impact= blow. against the type writer platenr 3. A- key operated erasing; attachment: for: a

typewriter:comprising; an arm. key. operated means to impel saidarn'rtovvard. the plateneof the typewriter, means slidableonsaid;armv and normally proj ecting. I therefrom; erasing; means movably carried said}. sliding means.,. and; rack and. pinion driving..- means associated with. said arm, and.- said slidable member "to;- actuate said erasing meansupon .amovement; ofr'thee'slidable means. out; or. its. normally projected; position in response to impact with. the; typewriter platen, said slidable means; being: movable: transversely of: said; arm and. comprising? a; hollow; member terminating at its forward endiinapair-zofrspaced since: by: simply depressing the-key l3 -sharply guards, said erasing: means: being movable between said guardsi for. contact with a. sheet of paper on:said;1platen:

LA; key operated: erasing: attachment for a typewriter: comprising ani, arm; key operated meansntoimpelisaidf armztoward the'platen 'ofthe typewriter, means slidable on said arm andnormallyrproiectingtrtherefrom, erasing means-movably carried by said sliding means; and meansassociated: with; said arm. and said slidable: memberrtotactuate said erasing means-:uporra .movement: of the slida-ble means out of its normally" projected; position in. response to-'impact= with the typewriter platen, said slidable means-being movable transversely of'sai'd arm and comprisingr a' hollow: member terminating at its fore ward end in a pair of space'd -guards', said erasing means 1 being movable between said guards for 4 contact with -a sheet of paperon-said platen, said last named? means including "arack andpinion drive between said slidabl'em'eans and said-arm.

5. A key operated erasing attachmentfor'a typewriter comprising an arm, key operated means to impel said arm toward the. platenof the typewriter, meansslid'able on saidarm and normally projecting therefrom; erasing means r'novably carried by said sliding means, and means associated with said arm and saidslidable member to actuate-said erasing means upon a movementof"the-slidablemeans out ofits normallyprojectedi position in response to impact with the 'type'writer platen, said. erasing means comprising a rotatable member, a belt' on said rotatable member and" driven thereby; and erasing:elements-carried by said belfi 6:..In. a l'key operated erasing attachment for a typewriter having a platen, an eraser element, a swinging carrier for the eraser element, said eraser element being movable in the carrier in a direction substantially parallel to the axis of the platen in response to an impact blow delivered by the carrier to the platen, key operated means to swing said carrier against the platen to deliver an impact blow thereagainst, said eraser element comprising a belt, and a series of sharp erasing members carried by said belt,

sheet on said platen.

CHARLES RI BENNETT.

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