Патент USA US2113437код для вставки
April 5, 1938. _ ‘_.wlLNl-:Rq > n2,113,437 ERASING ATTACHMENT FOR TYPEWRITERS n FiledMarCh 25, 1956 26 „..lll 3 Sheets-Sheet 1k ` INVENTOR. L ol//s> Wu. Nee, BY ¿am ¿it ' ATTORNEYS April 5, 1938. L. WILNER 2,113,437 ERASING ATTACHMENT FOR TYPEWRITERS Filed March 25, 1936 s. sheets-sheet 2- ATTORNEYSy ' April s, 1938. 2,113,437 L. WILNER ERASING ATTACHMENT FOR TYPEWRITERS .Filed March 25, 1936 3 Sheets-Sheet 5, N “à Ã? ä \ I. ® ® ï.“ à s fm 1» §33 hlm QQ‘ „Sì ‘ È C ‘E [Hnl- V ‘B ä @L INVENTOR. BY ATTORNEYSÍ .Patented Apr. 5, 1938 » 2,113,431 ?UNITED STATES PATENT oei-fics n 2,113,437 ERASING ATTACHMENT FOR TYPEWBITERS Louis Wilner, New York, N. Y. n .i Application March 25, 1938,l Serial No. 70,735 .4 omm- (ci. 1p1-,1an 'I'his invention relates to typewriters and other v writing machines or adding machines and refers more particularly to an erasing device for type- . Figure 4 is a section-along the line l-lfof Fig ure 3;\ f » " ' - ' . „ Figure 5 is a top view ofthe device illustrated writers. An object of the present invention is the pro vision of a simple and eñectively operable mech in Figure 3 ; characters, which mechanism may be convenient- ` bar carrying the eraser; Figure 6 is avperspective view of the vertical >bar carrying the eraser; anism for obliterating improperly written typel Figure 7 is a section through the portion of the 1y incorporated in a typewriting machine of 10 any standard make. Another object is the provision of a type-` writing machine having an attachment, through the use of which errors in typewriting may be quickly and easily corrected by erasure while ` ' ~ ' Figure 8 is a top/ view of the backk spacing mechanism; - ' " ‘ Figure. 9 is a section along the lineal-3 of Figures8and10; ' ' Figure 10 is a side view of mechanism. ' the back spacing ï .c v IThe typewriter illustrated ~in the drawings is usl A further object of the present invention is a standard construction. This typewriter is the provision of an erasing device which con- ’ shown merely by way of example, since 'the eras stitutes an integral part of the typewriting ma ing attachment constituting the subject-matter chine, and which is automatically operable by of the present invention may be used in connec the depression of a key to move backward the tion with typewriters of any type or- make. platen carrying the paper and thereupon to move 'I'he illustrated typewriter comprises ay frame an eraser over the letter or character to be ob i3 carried by the supports- Il and provided with the movable carriage i2. ’The platen i3 which 'I'he above and other objects of the present -is movable along with the carriage is mounted 25 invention may be realized through the provision » on brackets I4 and i5 and may be rotated by of an eraser removably mounted upon a rod and .means of the handle I3. The carriage is pro pressed by resilient means against the paper car vided with roller clamps l'l and I3 which press ried by the platen. f the paper against the platen, and with vthe line The rod is reciprocated in the vertical direc-- >spacer I9. A paper rest 2l constitutes _a part 30 tion by the depression of a key constituting a of the carriage and surrounds the lower por-' part of the keyboard of the typewriter, the eraser tion of the-platen i3. The carriage IZ'ismov carried bythe bar being passed over a typed able’along with its support 2| which is guided . character in the course-of this vertical recipro by the guide bars 22 rigidly attached to the 15 the paper remains in position on the machine. ~ literated. . ' i catory movement and obliterating the same. 35 Preferably, the vertical bar contacts a lever in the course of its upward movement which- actu ates the back spacer of the typewriter, so that before the eraser is brought into contact with the paper the platen is automatically moved one 40 space backward, thus placing the letter to be erased directly in the path of the eraser. -' frame. The'typewriter ribbon 23'is carried -by the rib bon spools 2l and 2l which are mounted upon pivots 26 and 21 carried by the horizontal bars 23 and 23, respectively. , _ ` Aplate or guide 33 for the type bars is at tached to the frame of the typewriter and is' provided with’a suitable slot 3i through which 'I'he invention will appear more clearly from ' the type' carried by a type bar 33 strikes the rib- ' ' the following detailed description when taken bon 23 situated in front of the paperi-not shown) in connection with the accompanying drawings, 45 showing, by way of example, a preferred embodi ment of the inventive idea. In the drawings; Figure l shows in front elevation a typewriter 50 provided with erasing device; l Figure 2 is a section along the line 2--2 of Figure l, with parts broken oiî. ` ` Figure 3 is a front elevation of the erasing at tachment on a larger scale with some ,parts broken away; and the platen I 3. ' ' Afmovable ribbon carrier 32 is situated be tween the platen I3 and the guide 30. The de vice which moves the ribbon carrier 32 upward so that it is situated in the path of the type when the latter passes through the' slot 3| is not shown in the drawings and is 'of standard > make. This device moves the ribbon 23 upward as soon as the operator depresses one of the keys, so that by the time the type reaches the slot 3| the ribbon is situated Vbetween the type and the papercovering the platen i3, so that r 2 9,118,487 the type leaves the impression of the ink carried by the ribbon'23 upon the paper. The typewriter is provided with typing keys 33 carried by the ends of the key levers 34. The key lever 34a (Figure 2) is provided with an ear 33 and is pivotally mounted upon a rod 33. 'I'he opposite end of the key lever 34a is connected with a link 31 which is attached to a type bar 33 carrying the type 33 and pivotally 10 mounted upon the pivot 43. Other key levers 34 are similarly constructed. . l In the normal inoperative position shown in Figure 2 of the drawings the type bars 33 rest upon a _support 4| which is rigidly connected with 15 the frame I3, while the key bars 34 rest upon ythe rod 42 which is also firmly connected with the frame I3. ‘ When the key 33a is depressed by the operator. the key bar 34a swings around its pivot 33 so 20 that the link 31 pushes upward the type bar 33 and thereby moves the type 33 into the slot 3| of the guide plate 33.- At the same time the rib bon supporting device 32 is moved upward so that the type 33 strikes the ribbon 23 and leaves an 25 impression upon a sheet of paper which covers is pivotally connected at 33 with an ear 33 con-stituting a part of a vertical eraser bar 33. The bar 33 extends between the vertical portion I 3a of the frame I3 and the support 3| carrying the shaft 40 upón which the type bars 33 are rotat ably mounted. The vertical bar 33 is provided with a diagonal ly bent portion 33a and an upper vertical por tion 33h extending between the platen |3 and the guide plate 33 at a short distance from the 10 movable ribbon support 32. The upper end ofthe rod 33 is illustrated on a larger scale in Figures 6 and 7 of the drawings; this end is bifurcated and comprises two substan tially flat prongs 32 and 33 separated by a vertical slot 34 and interconnected by the eraser casing 33 which is of trapezoidal form in cross-section, asl shown in Figure 7. An eraser 33 is situated in the casing 33 and may be held therein by fric tion or by any suitable stop not shown in the drawings. The eraser 33 may be of any standard make and is provided with an operative surface 31 which projects beyond the Vprongs 32 and 33 and which is passed over the surface of the paper by the actuation of the key 33 to erase a typed character. Any suitable abrasive may be used to provide the surface 31. 'I‘he eraser 33 may be conveniently removed from its casing 33 and replaced by a new one, whenever necessary. As shown more clearly in Figure 3, the eraser the platen I3. Thereupon the carriage I2 and the platen I3 supported >thereby are moved one space to the left (looking in the direction of Figure 1) by the mechanism of the usual type 30 which is not shown in the drawings. Finally, the type bar 33 and the key bar 34a are moved back to their original positions illustrated in Figure 2 . is pressed against the platen I3 and the paper by resilient means not shown in the drawings. covering the same by two leaf springs 33 and 33. The back space key 42a is carried by one end 'I'he leaf spring 33 presses against the prong 32 35 of >a horizontal lever 43 which extends to the while the leaf spring .33 is pressed against the rear of the can'iage and which is pivoted at 33 prong 33. 'I'he leaf spring 33 is carried by a ver (Figure l0). The rear end 3| of the lever 43 tical support 13, the lower end of which is firmly is in engagement with an arm 32 (Figure 9) ` connected with the guide 33. Similarly, the leaf pivoted at 33 and having a projection 34 which spring 33 is carried by a support 1| which is also engages a slanting surfaces 33 (Figure 8) of the attached to the guide 33. 'I‘he eraser casing 33 lever 44. The lever 44 is provided with a hook is guided by the leaf springs 33 and 39 during 43 and has a slot 43 through which passes the its movement. , pivot 41. The depression of the back space lever The leaf springs 33 and 33 press the prongs 32 43 is transmitted by the projection 34 of the arm and 33 against the platen I3 in all positions of 32 to the surface 33 of the lever 44, the hook the eraser bar 33. However, in the inoperative shaped end 43 of which is brought into engage position of the device the eraser 33 carried by the ment with a rack 43 carried by the movable casing 33 is‘situated below the springs 33 and 33 carriage I2 which supports the platen I3 (Figures so that the type 33 can pass conveniently through 2 and 4). The mechanism actuatingthe lever the slot 3| formed in the guide plate 33 and 44 causes the hook to carry out an oscillatory through the slot 34 provided between the bifur movement, in the course of which the carriage cated ends 32 and 33 of the eraser bar 33, thus and the platen I3 are moved one space to the reaching the ribbon 23 and making an impression right (looking in the direction of `Figure l). At upon the paper covering the platen I3. the end of this movement the hook 43 is in en~ The eraser attachment is operated in the fol 55 gagement with an adjacent tooth of the rack 43. lowing manner. The above-described typewriter is of the stand When the part of the paper provided with the ard type and does not constitute a part of the letter or the character to be erased is situated present invention. opposite the slot 3| the eraser is actuated merely In accordance with the presentinvention, the by pressing upon the key 33. Then the key bar 60 typewriter comprises an erasing attachment 3| swingsruponits pivot l34 so that the vertical which constitutes an integral part ofthe type `writer, and which is actuated by the depression of the key 33 shown in Figures 1 and 2. 'I'he key 33 is attachedto thevertically bent end of a 65 substantially horizontal key bar 3| provided with a curved middle portion 32 which extends over the support 42. The key bar 3| is provided with an ear 33 extending from the upper side thereof. A pivot 34 passes through the ear 33 so that the 70 key bar 3| is oscillatable around the lpivot 34. A second smaller ear 33 is situated on the 'oppo site lower side of the key bar 3| and carries one end of the coil spring- 33, the opposite end of which’ is attached at 31 to the frame I3 of the 75 typewriter. The opposite end of the key bar 3| rod 33 which isconnected by the pivot 33 with the bar 3|, is moved upward, thereby extending the spring 33. 'I'he eraser 33 carried by the upper vertical end of the rod 33 is moved along with the rod and the operative surface 31 of the eraser is passed over the letter or the character to be erased. The pressure of the eraser 33 against the paper is sumcient to erase the character, since such pressure is caused by the substantially strong leaf springs 33 and 33 which press against 70 the prongs 32 and 33 of the vertical bar 33. After the upward movement of the bar 33 has been completed, the spring 33 pulls the key bar 3| back into the position shown in Figure 2, so 75 n 3 anexa? that the eraser l. moves once again over the letter tion of the typewriter and requires merely the or character to be erased. addition oi' one key'upon the keyboard. . In most instances the letter or character is erased completely after the key Il! has been de pressed once. It is possible, however, to repeat this operation several times, provided that prior 10 15 ` 20 _ Furthermore, in‘y accordance with the present invention, the necessity of moving the carriage by hand one spaceback prior to the erasing may be eliminated, since the movement of the eraser to each actuation of the key 5l, the letter or > bar may automatically vactuate the back spacerÍ character to be erased is placed in front ofthe mechanism and r>move the carriage one space backward before the eraser is‘brought into contact slots 3| and 64. y The carriage I2 and the platen I3 move auto with the letter or character to be erased. matically one space forward immediately after a letter or character has been imprinted upon the l. In a typewriting machine having a frame, paper by one of the type levers Il. If _at that means movable relativelyvto said frame and sup time the operator nnds that an error has been porting a sheet of paper, a plurality oi types and made, the operator has to strike by hand the back means causingsaidtypesto carry out a striking 15 space key 42a in order to bring the incorrectly movement against the lint-mentioned means to typed character in front of the slot 3|. Then the print a characterupon said sheet, the path of operator strikes the eraser key Il and thereby movement of the types adjacent the first-men erases the incorrectly typed character. tioned means being the same for all types in rela In accordance with the present invention, this tion to said frame; an eraser support having two necessity of operating the back space lever 43 prongs at one of the ends thereof, a space being prior to the erasing may be eliminated through formed between said prongs which is situated in the provision of a device which automatically said path in the inoperative position of said sup moves the carriage I2 one space back after the port, and an eraser casing adapted to contain an eraser key 5l) has been actuated and before the eraser and connected with said prongs, said eraser eraser 66 moves in front of the slot 3|. This device for automatically moving back ward the carriage I2 at the time the eraser key il is actuated is illustrated in Figures 3, 4, 5, and 8 30 of the drawings, and comprises a lever 'Il having a horizontal portion 10a extending at right angles to the central axis of the platen Il, a vertical por tion 10b, another horizontal portion 10c, and a bent end lia which is situated adjacent the por tion 60D of the vertical bar 6B. 'I‘he lever 'l0 ex tends to the back of the carriage and is movable around a pivot ‘I2 carried by support 1I which isñrmly connected with the frame of the typewriter. As shown in Figures 5 and 8, the lever 1I is pro vided with a slot 14 through which a pin 18 is passed which is carried by the lever Il. « The lever 10 is actuated by a projection ‘It (Fig ure 3) which is carried by the eraser bar $0, or casing being situated outside of said path in said inoperative position of the support; means carried by said frame and engaging at least one of said prongs, the last-mentioned means being adapted to press the eraser contained in said’eraser css ing against the sheet of paper, means connected with said eraser support to move the same out oi' its inoperative position, whereby said eraser cas ing is moved into said path to cause the eraser to erase an incorrectly typed character, and $5 means connected with the last-mentioned means to move said eraser support back into its inoper ative position. ' 2. In a typewriter machine having a frame, means movable relatively to said frame and sup porting a sheet of paper, a plurality of types and means causing said types to carry out a striking movement against the first-mentioned means to may constitute an integral part thereof, and which' print a character upon said sheet, thev path`of is provided with an inclined surface 11. 'I'he movement of the types adjacent the nrst-men surface 11 engages the end 1|a of the lever ‘I0 tioned means being the same for all types in re i as the bar 60 is moved upwardly in the direction lation to said frame; a vertical eraser support of the arrow 18, thereby causing the lever 'I0 to having two prongs at the upper end thereof, a turn around its pivot 12. Since the pin 'I5 con space being formed between said prongs which 50 nects the lever 1I! with the lever Il, the move is situated in said path in the inoperative posi ment of the lever 'I0 is transmitted to the lever tion of said support, and an eraser casing adapt 44 which is provided with a projection 90 engaging ed to contain an eraser and connected with said an inclined surface 9|. The projection 90 will prongs, said eraser casing being situated below slide along the surface 8| causing the hook l5 of said path in said inoperative position oi' the sup the lever M to engage a tooth of the rack 48 and port, a spring engaging one of said prongs and to move the carriage one space backward. This adapted to press the eraser contained in said movement is substantially completed before the eraser casing against the sheet of paper„means eraser 66 is- moved in front of the slot 3|, so that connected with said eraser support to> move the the eraser is brought into contact with the letter same upward out- of its inoperative position, or character to be erased. » The projection 'I6 remains in contact with th lever ‘I0 during substantially the entire movement of the bar 6D, so that no further movement of the carriage I2 takes place and no other letters or characters are smeared by the eraser. jection 16 is moved out of contact with the lever 'I0 when the bar 60 returns to its original position shown in Figure 3. An important advantage of the present inven 70 tion is that the erasing attachment constitutes an integral part of the typewriter and is operated by the depression of a key in the same manner in which the other keys are operated. The attach ment does not interfere with the usual construc-- whereby said eraser casing is moved into said path to cause the'eraser to erase an incorrectly typed character, and means connected with the last-mentioned means to move said eraser sur.\~- port downward and' back into its inoperative position. ' y3. In a typewriting machine having typing keys, means supporting a sheet of paper, means moving the first-mentioned means one space for ward upon the actuation of each key, and means for moving` the' mst-mentioned means one space backward;- a support adapted to carry an eraser, means connected with said support to move the same for the purpose oi' causing said eraser to ’ pass over the sheet of paper to obliterate an in correctly typed character, and means connected 'ß 4 2,113,437 with the third-mentioned means and actuated by the moving support to cause the third-men tioned means to move the first-mentioned means pass over the sheet of paper to obliterate an in correctly typed character, a lever pivotally mounted upon said AIrame and yoperatively con one space backward, whereby the incorrectly f nected with the back rspacing means, said lever typed character may be `placed in the path o1'l when moved actuating the back spacing means movement of the eraser. - 4. In a typewriting machine having a frame, a plurality of typing keys, means supporting a sheet of paper, means moving the ñrst-men tioned means one space forward relatively to said frame upon the actuation of each key, and back spacing means for moving the first-mentioned ` means one space backward relatively to said frame; a support adapted to carry an eraser,v means connected with said support to move the same for the purpose of causing said eraser to to move the' ñrst-mentioned means one space backward, one end oi’ said lever being situated adjacent said support, and a projection carried by said support and engaging said end of the lever while the support is moving to move said 10 lever and thereby cause the back spacing means to move the ñrst~mentioned means one space backward, whereby the incorrectly typed charac ter may be placed in the path of movement ofthe eraser. ~ ’ 15 LOUIS WILNER.