US3927748A - Attachment for converting a standard typewriter to a self-correcting typewriter - Google Patents
Attachment for converting a standard typewriter to a self-correcting typewriter Download PDFInfo
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- US3927748A US3927748A US470476A US47047674A US3927748A US 3927748 A US3927748 A US 3927748A US 470476 A US470476 A US 470476A US 47047674 A US47047674 A US 47047674A US 3927748 A US3927748 A US 3927748A
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- typewriter
- backspace
- ribbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/26—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling
- B41J29/36—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling for cancelling or correcting errors by overprinting
Definitions
- the present invention has for its object the provision of a simple, low-cost device that can be attached to an external part of a typewriter and which will convert a standard typewriter into an error-correcting one.
- the invention comprises a device adapted to be attached to an external part of a typewriter.
- the device has first and second keys and a mechanism which depresses the backspace key of the typewriter if and when either of said first or second keys is depressed.
- the mechanism also leaves the ribbon selector in one position (selecting one field of a dual field ribbon) after the first key has been depressed, and leaves the ribbon selector in another position (selecting the other field of a dual field ribbon) after the second key has been depressed.
- FIG. I is a plan view of one form of a conventional typewriter, with my novel attachment added thereto;
- FIG. 2 is a front view of said typewriter with my novel attachment added thereto;
- FIG. 3 is a detail left side view of the attachment of FIGS. 1 and 2 taken along section line 3-3 of FIG. 2;
- FIG. 4 is a detail right side view of said attachment taken along section line 4-4 of FIG. 2;
- FIG. 5 is a plan view of another conventional typewriter, with another form of attachment added thereto;
- FIG. 6 is a cross-section along line 6-6 of FIG. 5 and shows a detailed view of the mechanism operated by one of the keys of the attachment;
- FIG. 7 is the same view as FIG. 6 but before the key has been depressed.
- a conventional portable typewriter has a frame 10 carrying the usual casing 11.
- the usual keyboard has writing keys such as 12 and a backspace key 13.
- the typewriter has the usual ribbon selector arm 14 which shifts a dual field ribbon from one color to the other.
- My novel attachment comprises a plate 15 attached by bolts 16 and sleeves 16a to the underside of the typewriter frame 10.
- the plate 15 has two vertical support portions 17 and 18.
- the vertical support portion 17 is shown in more detail in FIG. 3 and has two keys 1) and 20 pivoted at their rear ends at 21 to the support portion 17.
- a rocker arm 22 is attached to rod 23 which rod 23 is supported by support portions 17 and 18 which define holes 24 and 25 through which rod 23 passes.
- extension arm 26, which is integral with key 19 presses downwardly on the right hand end of rocker arm 22 and rotates it clockwise (FIG. 3) which in turn rotates rod 23 clockwise.
- This motion is transferred to the right side of the typewriter where it rotates vertical arm 27 counterclockwise (as shown in FIG. 4) and thus rotates the forked arm 28 to move it toward the typist.
- a spring 29 returns key 19 to normal position when it is released.
- the second thing which occurs when key 19 is depressed is that the arm 30, which supports key 19, moves downwardly and engages arm 31 which is carried on L-shaped arm 32 which is pivoted to support portion 17 at 33.
- This arm 32 carries a horizontal arm 34 which rides on top of backspace key 13 so that the latter is depressed whenever key 19 is depressed.
- Key 20 is shown in a depressed position in FIG. 3. However, assume that it has been returned to normal and key 19 has then been depressed as aforesaid. If then key 20 is depressed, the arm 35, which is integral with key 20, engages the left end of rocker arm 22, thus rotating shaft 23 and shifting the forked arm 28 and the ribbon selector arm 14 to its position farthest from the typist. This selects the other field of the dual field ribbon. At the same time, as key 20 is depressed, it engages arm 31 and thus rotates L-shaped arm 32 depressing the backspace key 13.
- the typewriter has a dual field ribbon, one half of which is black and the other half of which is white. Assume that the black half is selected when selector arm 14 is moved away (forward) from the typist and the white half selected when the selector arm 14 is moved toward the typist. Assume now that the ribbon selector arm 14 is in the forward position and the typist makes a mistake, typing a wrong letter. The following procedure is followed to effect a correction: Key 19 is depressed which not only depresses the backspace key 13 but also shifts selector arm 14 to its rearward position selecting the white half of the ribbon. The typist then presses the key I2 representing the wrong letter to thus cover up the mistake. Key 20 is then depressed which in turn depresses backspace key I3, moves ribbon selector arm 14 forward, and therefore places the typewriter in normal typing condition.
- FIG. 5 illustrates another typewriter having a frame supporting a casing 51, a backspace key 13, a ribbon selector arm 14, and the usual keyboard having writing keys l2.
- the attachment has casing 52 which is clamped or otherwise attached to the typewriter casing 51 by bolt 53. Keys 19a and 20a are supported by arms 54 and 55 respectively which are pivoted at 56a and 57a respectively.
- depression of key 190 depresses arm 54, which depresses arm 61 and the backspace key 13, and also rotates lip 63 which moves arm 64 rearward and rotates arm 59 clockwise moving forked lever 28a and the ribbon selector arm 14 forward (away from the typist).
- FIGS. 5, 6, and 7 may be operated to correct mistakes in the same manner as in the case of FIGS. 1-4.
- backspace key 13 may still be depressed and it will still function when depressed, as before. Even if the typist, in an effort to depress backspace key 13, in fact depresses lever 34, the latter will depress the backspace key 13 which will still work in its normal manner.
- An attachment device as defined in claim 1 for use with a typewriter in which the backspace means comprises a backspace key near one end of the keyboard and the ribbon selector includes an operating control arm near the opposite end of the keyboard, said frame means extending under the typewriter and also extending upward along opposite sides of the typewriter, said control means being adjacent said backspace key and said movable means being adjacent said control means, said movable means and said control means being interconnected under the typewriter and adjacent the said frame means of said device.
- An attachment device as defined in claim 1 for use in a typewriter of the type in which the backspace means includes a backspace key and the ribbon selector includes a control element adjacent the backspace key comprising said frame means for the attachment device including means for attaching said frame means to a portion of the typewriter adjacent said backspace key,
- said frame means comprising an enclosure
- said movable means including means extending out of said enclosure to engage said control element.
- typing means including a keyboard carried by said frame,
- backspace means including an element for operating the backspace means
- ribbon selector means including a mechanism for operating the ribbon selector means
- said device comprising:
- first and second keys b. means which when either of said keys is depressed operates said element to effect a backspace operation
- c. means which operates said mechanism to insure that the ribbon selector means is in one position after the first key has been depressed and is in another position after the second key has been depressed.
- An attachment for an existing typewriter that will give it additional functions, said typewriter having backspace means including a backspace key, a ribbon 1.
- supplementary backspace means comprises an arm that overlies the backspace key of the existing typewriter when the attachment is mounted on said typewriter, said arm being movable downwardly in event the typist presses said arm, thereby permitting the typist to press it in order to operate the backspace key of the existing typewriter.
- the supplemental backspace means comprises an arm that overlies the backspace key of the existing typewriter when the attachment is mounted on said typewriter, said arm being movable downwardly in event the typist depresses said arm thereby permitting the typist to depress said arm in order to operate said backspace key, and
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Abstract
An attachment adapted to be fastened to an external portion of a standard typewriter to convert it to a self-correcting one. The attachment includes first and second keys, the depression of either of which depresses the backspace key. There is a mechanism controlled by said two keys such that after the first key is depressed, the ribbon selector is left in a first position and after the second key is depressed, the ribbon selector is left in another position.
Description
United States Patent 1 Wolowitz 1 ATTACHMENT FOR CONVERTING A STANDARD TYPEWRITER TO A SELF-CORRECTING TYPEWRITER [76] Inventor: William H. Wolowitz, 6905 Persimmon Tree Road, Bethesda, Md. 20034 [22] Filed: May 16, 1974 [21] Appl. No.: 470,476
[52] US. Cl 197/181; 197/91 [51] Int. Cl. B4lJ 29/16 [58] Field ofSearch 197/91, 151,172, 180, 197/181, 156
[56] References Cited UNITED STATES PATENTS 1,183,424 5/1916 Baldwin 197/181 1,399,734 12/1921 Baldwin 197/181 X 1,415,293 5/1922 Ba1dwin.... 197/181 2,392,517 1/1946 Banister 197/181 X 3,149,711 9/1964 Wolowitz 197/91 3,154,183 10/1964 Wolowitz 197/91 3,155,216 11/1964 Talmage 197/181 3,180,474 4/1965 Kuhlman 197/181 [4 1 Dec. 23, 1975 3,204,745 9/1965 Wolowitz 197/91 3,204,746 9/1965 Wolowitz 197/91 3,270,852 9/1966 Fondiller 197/91 3,397,767 8/1968 Hobbs 197/181 3,595,362 7/1971 Wolowitz 197/181 X 3,724,633 4/1973 Korb et al. 197/151 3,729,081 4/1973 Ozimek et 197/181 X 3,788,442 1/1974 Lehnhal'dt et a1. 197/181 3,799,316 3/1974 Davidge et a1 197/181 3,834,512 9/1974 Haugen 197/181 Primary ExaminerWm. H. Grieb Attorney, Agent, or FirmHal1 & Myers 1 1 ABSTRACT 8 Claims, 7 Drawing Figures U.S. Patent Dec. 23, 1975 Sheet 1 of2 3,927,748
E: m H- 3M] tmmmmyg? US. Patent Dec. 23, 1975 Sheet 2 of 2 3,927,748
ATTACHMENT FOR CONVERTING A STANDARD TYPEWRITER TO A SELF-CORRECTING TYPEWRITER RELATED APPLICATION This application is related to my prior copending application, Ser. No. 396,676, filed Sept. 13, 1973, entitled "Flexible Correction Auxiliaries For Use With Golf Ball Typewriters".
BACKGROUND OF THE INVENTION In my prior patents, such as US. Pat. No. 3,204,746, issued Sept. 7, I965, entitled Typewriter With Error Correcting Key," I have illustrated a typewriter that enables the typist to quickly and efficiently correct typing errors. However, such prior patents show the error-correction feature as built into the typewriter at the factory or at least to be installed internally only after the typewriter has been at least partly taken apart.
The present invention has for its object the provision of a simple, low-cost device that can be attached to an external part of a typewriter and which will convert a standard typewriter into an error-correcting one.
SUMMARY OF THE INVENTION The invention comprises a device adapted to be attached to an external part of a typewriter. The device has first and second keys and a mechanism which depresses the backspace key of the typewriter if and when either of said first or second keys is depressed. The mechanism also leaves the ribbon selector in one position (selecting one field of a dual field ribbon) after the first key has been depressed, and leaves the ribbon selector in another position (selecting the other field of a dual field ribbon) after the second key has been depressed.
Accordingly, if the aforesaid attachment has been applied to a typewriter and a dual-field ribbon having black and white fields has been inserted into the typewriter, errors may be easily corrected as follows: After striking the "wrong" key, thus printing the wrong" letter, the aforesaid first key is depressed to not only backspace the typewriter but to select the white field of the ribbon. The aforesaid wrong key is again depressed obliterating the wrong letter. The aforesaid second key is then depressed which again backspaces the typewriter and also selects the black half of the dual ribbon. Normal typing may then proceed.
BRIEF DESCRIPTION OF THE DRAWING In the drawing FIG. I is a plan view of one form of a conventional typewriter, with my novel attachment added thereto;
FIG. 2 is a front view of said typewriter with my novel attachment added thereto;
FIG. 3 is a detail left side view of the attachment of FIGS. 1 and 2 taken along section line 3-3 of FIG. 2;
FIG. 4 is a detail right side view of said attachment taken along section line 4-4 of FIG. 2;
FIG. 5 is a plan view of another conventional typewriter, with another form of attachment added thereto;
FIG. 6 is a cross-section along line 6-6 of FIG. 5 and shows a detailed view of the mechanism operated by one of the keys of the attachment;
FIG. 7 is the same view as FIG. 6 but before the key has been depressed.
DETAILED DESCRIPTION OF THE INVENTION In FIG. I, a conventional portable typewriter has a frame 10 carrying the usual casing 11. The usual keyboard has writing keys such as 12 and a backspace key 13. In addition, the typewriter has the usual ribbon selector arm 14 which shifts a dual field ribbon from one color to the other.
My novel attachment comprises a plate 15 attached by bolts 16 and sleeves 16a to the underside of the typewriter frame 10. The plate 15 has two vertical support portions 17 and 18. The vertical support portion 17 is shown in more detail in FIG. 3 and has two keys 1) and 20 pivoted at their rear ends at 21 to the support portion 17. A rocker arm 22 is attached to rod 23 which rod 23 is supported by support portions 17 and 18 which define holes 24 and 25 through which rod 23 passes.
When key 19 is depressed two things occur simultaneously. One of these is that extension arm 26, which is integral with key 19, presses downwardly on the right hand end of rocker arm 22 and rotates it clockwise (FIG. 3) which in turn rotates rod 23 clockwise. This motion is transferred to the right side of the typewriter where it rotates vertical arm 27 counterclockwise (as shown in FIG. 4) and thus rotates the forked arm 28 to move it toward the typist. This shifts the ribbon selector to one field of the dual field ribbon (not shown). A spring 29 returns key 19 to normal position when it is released. The second thing which occurs when key 19 is depressed is that the arm 30, which supports key 19, moves downwardly and engages arm 31 which is carried on L-shaped arm 32 which is pivoted to support portion 17 at 33. This arm 32 carries a horizontal arm 34 which rides on top of backspace key 13 so that the latter is depressed whenever key 19 is depressed.
Let us assume that the typewriter has a dual field ribbon, one half of which is black and the other half of which is white. Assume that the black half is selected when selector arm 14 is moved away (forward) from the typist and the white half selected when the selector arm 14 is moved toward the typist. Assume now that the ribbon selector arm 14 is in the forward position and the typist makes a mistake, typing a wrong letter. The following procedure is followed to effect a correction: Key 19 is depressed which not only depresses the backspace key 13 but also shifts selector arm 14 to its rearward position selecting the white half of the ribbon. The typist then presses the key I2 representing the wrong letter to thus cover up the mistake. Key 20 is then depressed which in turn depresses backspace key I3, moves ribbon selector arm 14 forward, and therefore places the typewriter in normal typing condition.
FIG. 5 illustrates another typewriter having a frame supporting a casing 51, a backspace key 13, a ribbon selector arm 14, and the usual keyboard having writing keys l2.
The attachment has casing 52 which is clamped or otherwise attached to the typewriter casing 51 by bolt 53. Keys 19a and 20a are supported by arms 54 and 55 respectively which are pivoted at 56a and 57a respectively.
When key 200 (FIG. 6) is depressed, it engages the lip 56 at the lower end of arm 57 which is pivoted at its upper end to the casing 52. The arm 57 rotates clockwise as the key 20a is depressed thus moving the apparatus to the positions shown in FIG. 6 where rod 58, which is pivoted at its forward end to arm 57 and to arm 59 at its rear end, is shown moved into its most leftward position. As rod 58 moves leftward, it rotates arm 59 (FIG. counterclockwise about its center pivot 60 and thus moves the forked arm 28a and the ribbon selector arm 14 toward the typist. As key a is depressed, it also depresses arm 61 (which is pivoted at 62) thereby depressing the backspace key 13.
Similarly, depression of key 190 depresses arm 54, which depresses arm 61 and the backspace key 13, and also rotates lip 63 which moves arm 64 rearward and rotates arm 59 clockwise moving forked lever 28a and the ribbon selector arm 14 forward (away from the typist).
The apparatus of FIGS. 5, 6, and 7 may be operated to correct mistakes in the same manner as in the case of FIGS. 1-4.
It is noted that my attachment may be added to an existing typewriter without preventing any of the following functions of the existing typewriter:
a. In FIG. 1, the addition of the attachment does not impair any effort of the typist to press any of the writing keys 12; hence those keys continue to function as before.
b. Similarly, the backspace key 13 may still be depressed and it will still function when depressed, as before. Even if the typist, in an effort to depress backspace key 13, in fact depresses lever 34, the latter will depress the backspace key 13 which will still work in its normal manner.
c. The parts 22, 23, 24, 25, 27 and 28 do not impair the operation of ribbon selector arm 14. That selector arm 14 may still be moved manually, to engage printing fields, the same as before my attachment was added. For example, if the apparatus is in the position shown in FIG. 3, and the ribbon selector arm 14 is moved to its other position, all of the parts 22, 23, 24, 25, 27 and 28 rotate but are not restrained by anything that positively stops them.
d. Similarly, if the casing 52 of FIG. 5 is added to an existing typewriter, the backspace key 13 of the existing typewriter may still be depressed, and indeed the typist may press arm 61 downwardly to indirectly operate the backspace key 13. Since arm 61 rides below arms 54 and 55, they will not interfere with any downward movement of arm 34.
e. [t is equally true that none of the mechanism comprising my attachment will interfere with the typist moving ribbon selector arm 14 to either of its two printing field positions. The parts 28, 56, 57, 58, etc., are not restrained in any way that interferes with a movement of the ribbon selector arm 14 that selects either of said two positions.
I claim to have invented:
means of the typewriter when either of said first or second keys is depressed, and movable means which when said first key is depressed positions said ribbon selector in a first position and which when said second key is depressed positions said ribbon selector in a second position, and frame means for attaching said device to the typewriter to position the device external to the typewriter in a position such that said control means is in operative relation to said backspace means and said movable means is in operative relation to said ribbon selector.
2. An attachment device as defined in claim 1 for use with a typewriter in which the backspace means comprises a backspace key near one end of the keyboard and the ribbon selector includes an operating control arm near the opposite end of the keyboard, said frame means extending under the typewriter and also extending upward along opposite sides of the typewriter, said control means being adjacent said backspace key and said movable means being adjacent said control means, said movable means and said control means being interconnected under the typewriter and adjacent the said frame means of said device.
3. An attachment device as defined in claim 1 for use in a typewriter of the type in which the backspace means includes a backspace key and the ribbon selector includes a control element adjacent the backspace key comprising said frame means for the attachment device including means for attaching said frame means to a portion of the typewriter adjacent said backspace key,
said frame means comprising an enclosure,
said first and second keys extending out of said enclosure, and
said movable means including means extending out of said enclosure to engage said control element.
4. in a typewriter,
a frame,
typing means including a keyboard carried by said frame,
backspace means including an element for operating the backspace means,
ribbon selector means including a mechanism for operating the ribbon selector means,
a casing carried by said frame and at least partially extending around some of the operating parts of the typewriter,
the keyboard, said element and said mechanism extending out of said casing,
and a device attached to said typewriter and positioned outside of said casing, said device comprising:
a. first and second keys b. means which when either of said keys is depressed operates said element to effect a backspace operation, and
c. means which operates said mechanism to insure that the ribbon selector means is in one position after the first key has been depressed and is in another position after the second key has been depressed.
5. An attachment for an existing typewriter that will give it additional functions, said typewriter having backspace means including a backspace key, a ribbon 1. An attachment device for use with a typewriter of 65 having a plurality of printing fields and also having the type that has a keyboard, a backspace means and a ribbon selector, comprising first and second keys including control means for operating said backspace ribbon field selecting means including a manually operable device for controlling the ribbon printing field selecting means for selecting one of the printing fields of the ribbon, comprising:
mounting means carrying the attachment and adapted to be attached to an existing typewriter,
a first key carried by said mounting means,
a second key carried by said mounting means,
supplementary backspace means operated by the depression of either of said first or second keys for operating the backspace means that is a part of the existing typewriter, all without preventing the typist from operating said backspace means that is a part of said typewriter,
and supplementary ribbon field selecting means which operates the ribbon field selecting means that is on the existing typewriter, to insure that said ribbon field selecting means that is on the existing typewriter is in one position after said first key has been depressed and is in another position after said second key has been depressed, without preventing the typist from also manually selecting the printing fields of the ribbon by operating said ribbon printing field selecting means that is on the existing typewriter.
6. An attachment for an existing typewriter as defined in claim 5 in which both the supplementary backspace means and the supplementary ribbon field selecting means is carried by said mounting means, so that the entire attachment is a single unit.
7. An attachment as defined in claim 5 in which the supplementary backspace means comprises an arm that overlies the backspace key of the existing typewriter when the attachment is mounted on said typewriter, said arm being movable downwardly in event the typist presses said arm, thereby permitting the typist to press it in order to operate the backspace key of the existing typewriter.
8. An attachment for an existing typewriter as defined in claim 6 in which:
the supplemental backspace means comprises an arm that overlies the backspace key of the existing typewriter when the attachment is mounted on said typewriter, said arm being movable downwardly in event the typist depresses said arm thereby permitting the typist to depress said arm in order to operate said backspace key, and
the supplemental ribbon field selecting means engages the ribbon field selecting means of the existing typewriter to control the ribbon field selection.
1 i I! i
Claims (8)
1. An attachment device for use with a typewriter of the type that has a keyboard, a backspace means and a ribbon selector, comprising first and second keys including control means for operating said backspace means of the typewriter when either of said first or second keys is depressed, and movable means which when said first key is depressed positions said ribbon selector in a first position and which when said second key is depressed positions said ribbon selector in a second position, and frame means for attaching said device to the typewriter to position the device external to the typewriter in a position such that said control means is in operative relation to said backspace means and said movable means is in operative relation to said ribbon selectoR.
2. An attachment device as defined in claim 1 for use with a typewriter in which the backspace means comprises a backspace key near one end of the keyboard and the ribbon selector includes an operating control arm near the opposite end of the keyboard, said frame means extending under the typewriter and also extending upward along opposite sides of the typewriter, said control means being adjacent said backspace key and said movable means being adjacent said control means, said movable means and said control means being interconnected under the typewriter and adjacent the said frame means of said device.
3. An attachment device as defined in claim 1 for use in a typewriter of the type in which the backspace means includes a backspace key and the ribbon selector includes a control element adjacent the backspace key comprising said frame means for the attachment device including means for attaching said frame means to a portion of the typewriter adjacent said backspace key, said frame means comprising an enclosure, said first and second keys extending out of said enclosure, and said movable means including means extending out of said enclosure to engage said control element.
4. In a typewriter, a frame, typing means including a keyboard carried by said frame, backspace means including an element for operating the backspace means, ribbon selector means including a mechanism for operating the ribbon selector means, a casing carried by said frame and at least partially extending around some of the operating parts of the typewriter, the keyboard, said element and said mechanism extending out of said casing, and a device attached to said typewriter and positioned outside of said casing, said device comprising: a. first and second keys b. means which when either of said keys is depressed operates said element to effect a backspace operation, and c. means which operates said mechanism to insure that the ribbon selector means is in one position after the first key has been depressed and is in another position after the second key has been depressed.
5. An attachment for an existing typewriter that will give it additional functions, said typewriter having backspace means including a backspace key, a ribbon having a plurality of printing fields and also having ribbon field selecting means including a manually operable device for controlling the ribbon printing field selecting means for selecting one of the printing fields of the ribbon, comprising: mounting means carrying the attachment and adapted to be attached to an existing typewriter, a first key carried by said mounting means, a second key carried by said mounting means, supplementary backspace means operated by the depression of either of said first or second keys for operating the backspace means that is a part of the existing typewriter, all without preventing the typist from operating said backspace means that is a part of said typewriter, and supplementary ribbon field selecting means which operates the ribbon field selecting means that is on the existing typewriter, to insure that said ribbon field selecting means that is on the existing typewriter is in one position after said first key has been depressed and is in another position after said second key has been depressed, without preventing the typist from also manually selecting the printing fields of the ribbon by operating said ribbon printing field selecting means that is on the existing typewriter.
6. An attachment for an existing typewriter as defined in claim 5 in which both the supplementary backspace means and the supplementary ribbon field selecting means is carried by said mounting means, so that the entire attachment is a single unit.
7. An attachment as defined in claim 5 in which the supplementary backspace means comprises an arm that overlies the backspace key of the existing typewriter when the attachment is mounted on said typewriter, Said arm being movable downwardly in event the typist presses said arm, thereby permitting the typist to press it in order to operate the backspace key of the existing typewriter.
8. An attachment for an existing typewriter as defined in claim 6 in which: the supplemental backspace means comprises an arm that overlies the backspace key of the existing typewriter when the attachment is mounted on said typewriter, said arm being movable downwardly in event the typist depresses said arm thereby permitting the typist to depress said arm in order to operate said backspace key, and the supplemental ribbon field selecting means engages the ribbon field selecting means of the existing typewriter to control the ribbon field selection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US470476A US3927748A (en) | 1974-05-16 | 1974-05-16 | Attachment for converting a standard typewriter to a self-correcting typewriter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US470476A US3927748A (en) | 1974-05-16 | 1974-05-16 | Attachment for converting a standard typewriter to a self-correcting typewriter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3927748A true US3927748A (en) | 1975-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US470476A Expired - Lifetime US3927748A (en) | 1974-05-16 | 1974-05-16 | Attachment for converting a standard typewriter to a self-correcting typewriter |
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| US (1) | US3927748A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976182A (en) * | 1975-06-23 | 1976-08-24 | Scm Corporation | Automatic function mechanism for typewriters |
| US3976184A (en) * | 1975-06-23 | 1976-08-24 | Scm Corporation | Ribbon cartridge for dual automatic typewriter function |
| US3977510A (en) * | 1975-06-23 | 1976-08-31 | Scm Corporation | Automatic function mechanism for typewriters |
| US3978965A (en) * | 1975-06-23 | 1976-09-07 | Scm Corporation | Ribbon cartridge for automatic typewriter function |
| US3985219A (en) * | 1975-06-23 | 1976-10-12 | Scm Corporation | Ribbon cartridge for automatic typewriter function |
| US3987885A (en) * | 1975-06-23 | 1976-10-26 | Scm Corporation | Automatic single and repeat function mechanism for typewriters |
| US3991874A (en) * | 1975-06-23 | 1976-11-16 | Scm Corporation | Automatic function mechanism for typewriters |
| US3997047A (en) * | 1974-12-27 | 1976-12-14 | Wolowitz William H | Attachment for converting a standard typewriter into a correcting typewriter |
| US4492485A (en) * | 1980-09-02 | 1985-01-08 | Sears, Roebuck And Co. | Error correcting typewriter for simplified word obliteration |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1183424A (en) * | 1915-08-12 | 1916-05-16 | John H Baldwin | Erasing attachment for writing-machines. |
| US1399734A (en) * | 1918-10-26 | 1921-12-13 | Baldwin Eraser Company | Erasing device |
| US1415293A (en) * | 1918-08-14 | 1922-05-09 | Baldwin Eraser Company | Erasing attachment for typewriters |
| US2392517A (en) * | 1944-10-07 | 1946-01-08 | James G Banister | Accessory device for typewriters |
| US3149711A (en) * | 1963-08-15 | 1964-09-22 | William H Wolowitz | Error-correcting typewriter |
| US3154183A (en) * | 1962-03-16 | 1964-10-27 | William H Wolowitz | Ribbon shift for error-obliterating typewriters |
| US3155216A (en) * | 1962-03-26 | 1964-11-03 | Calvin C Talmage | Type-effacing device |
| US3180474A (en) * | 1963-07-05 | 1965-04-27 | Kuhlman Irene Dorsey | Means for holding correction material for correcting typing errors |
| US3204746A (en) * | 1963-08-23 | 1965-09-07 | Wolowitz William Howard | Typewriter with error-correction features |
| US3204745A (en) * | 1963-07-22 | 1965-09-07 | Wolowitz William Howard | Error-correcting typewriter |
| US3270852A (en) * | 1963-02-04 | 1966-09-06 | Fondiller Robert | Typewriter erasure mechanism |
| US3397767A (en) * | 1965-09-07 | 1968-08-20 | Robert B. Hobbs | Erasure tape mechanism for typewriters |
| US3595362A (en) * | 1969-10-21 | 1971-07-27 | William H Wolowitz | Typewriter backspace and ribbon-field control |
| US3724633A (en) * | 1970-12-30 | 1973-04-03 | Ibm | Feed system for an adhesive ribbon or the like |
| US3729081A (en) * | 1970-12-11 | 1973-04-24 | Sears Roebuck & Co | Typewriter carriage and ribbon field control for error correction |
| US3788442A (en) * | 1972-06-27 | 1974-01-29 | Ibm | Erase ribbon feed |
| US3799316A (en) * | 1970-12-30 | 1974-03-26 | Ibm | Automatic erase mechanism |
| US3834512A (en) * | 1972-07-14 | 1974-09-10 | Efficiency Prod Co | Correction tape attachment for typewriters |
-
1974
- 1974-05-16 US US470476A patent/US3927748A/en not_active Expired - Lifetime
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1183424A (en) * | 1915-08-12 | 1916-05-16 | John H Baldwin | Erasing attachment for writing-machines. |
| US1415293A (en) * | 1918-08-14 | 1922-05-09 | Baldwin Eraser Company | Erasing attachment for typewriters |
| US1399734A (en) * | 1918-10-26 | 1921-12-13 | Baldwin Eraser Company | Erasing device |
| US2392517A (en) * | 1944-10-07 | 1946-01-08 | James G Banister | Accessory device for typewriters |
| US3154183A (en) * | 1962-03-16 | 1964-10-27 | William H Wolowitz | Ribbon shift for error-obliterating typewriters |
| US3155216A (en) * | 1962-03-26 | 1964-11-03 | Calvin C Talmage | Type-effacing device |
| US3270852A (en) * | 1963-02-04 | 1966-09-06 | Fondiller Robert | Typewriter erasure mechanism |
| US3180474A (en) * | 1963-07-05 | 1965-04-27 | Kuhlman Irene Dorsey | Means for holding correction material for correcting typing errors |
| US3204745A (en) * | 1963-07-22 | 1965-09-07 | Wolowitz William Howard | Error-correcting typewriter |
| US3149711A (en) * | 1963-08-15 | 1964-09-22 | William H Wolowitz | Error-correcting typewriter |
| US3204746A (en) * | 1963-08-23 | 1965-09-07 | Wolowitz William Howard | Typewriter with error-correction features |
| US3397767A (en) * | 1965-09-07 | 1968-08-20 | Robert B. Hobbs | Erasure tape mechanism for typewriters |
| US3595362A (en) * | 1969-10-21 | 1971-07-27 | William H Wolowitz | Typewriter backspace and ribbon-field control |
| US3729081A (en) * | 1970-12-11 | 1973-04-24 | Sears Roebuck & Co | Typewriter carriage and ribbon field control for error correction |
| US3724633A (en) * | 1970-12-30 | 1973-04-03 | Ibm | Feed system for an adhesive ribbon or the like |
| US3799316A (en) * | 1970-12-30 | 1974-03-26 | Ibm | Automatic erase mechanism |
| US3788442A (en) * | 1972-06-27 | 1974-01-29 | Ibm | Erase ribbon feed |
| US3834512A (en) * | 1972-07-14 | 1974-09-10 | Efficiency Prod Co | Correction tape attachment for typewriters |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997047A (en) * | 1974-12-27 | 1976-12-14 | Wolowitz William H | Attachment for converting a standard typewriter into a correcting typewriter |
| US3976182A (en) * | 1975-06-23 | 1976-08-24 | Scm Corporation | Automatic function mechanism for typewriters |
| US3976184A (en) * | 1975-06-23 | 1976-08-24 | Scm Corporation | Ribbon cartridge for dual automatic typewriter function |
| US3977510A (en) * | 1975-06-23 | 1976-08-31 | Scm Corporation | Automatic function mechanism for typewriters |
| US3978965A (en) * | 1975-06-23 | 1976-09-07 | Scm Corporation | Ribbon cartridge for automatic typewriter function |
| US3985219A (en) * | 1975-06-23 | 1976-10-12 | Scm Corporation | Ribbon cartridge for automatic typewriter function |
| US3987885A (en) * | 1975-06-23 | 1976-10-26 | Scm Corporation | Automatic single and repeat function mechanism for typewriters |
| US3991874A (en) * | 1975-06-23 | 1976-11-16 | Scm Corporation | Automatic function mechanism for typewriters |
| US4492485A (en) * | 1980-09-02 | 1985-01-08 | Sears, Roebuck And Co. | Error correcting typewriter for simplified word obliteration |
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