CA1174758A - Device for adjusting the slope of a keyboard - Google Patents
Device for adjusting the slope of a keyboardInfo
- Publication number
- CA1174758A CA1174758A CA000375350A CA375350A CA1174758A CA 1174758 A CA1174758 A CA 1174758A CA 000375350 A CA000375350 A CA 000375350A CA 375350 A CA375350 A CA 375350A CA 1174758 A CA1174758 A CA 1174758A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- adjustment shaft
- keyboard
- shaft
- adjustment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
- G06F3/0208—Arrangements for adjusting the tilt angle of a keyboard, e.g. pivoting legs
-
- 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
- B41J5/00—Devices or arrangements for controlling character selection
- B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
- B41J5/10—Arrangements of keyboards, e.g. key button disposition
- B41J5/105—Constructional details of keyboard frames, e.g. adjusting or fixation means
-
- G—PHYSICS
- G12—INSTRUMENT DETAILS
- G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
- G12B5/00—Adjusting position or attitude, e.g. level, of instruments or other apparatus, or of parts thereof; Compensating for the effects of tilting or acceleration, e.g. for optical apparatus
Abstract
ABSTRACT OF THE DISCLOSURE
The inclination angle of a keyboard is made infinitely adjustable between preset maximum and minimum angles to suit individual operator and work place needs by means of an adjustment assembly. The assembly calls for select-ably setting cam plate housing seats located at one end of the keyboard to in-crease or lower the angle of inclination.
The inclination angle of a keyboard is made infinitely adjustable between preset maximum and minimum angles to suit individual operator and work place needs by means of an adjustment assembly. The assembly calls for select-ably setting cam plate housing seats located at one end of the keyboard to in-crease or lower the angle of inclination.
Description
The invention relates to a keyboard assembly and, more particularly, to means for varying the slope of the working face of the keyboard.
Increasingly, ergonomic demands are playing a role in the construction and use of keyboards, such as a telex machine or a type-keyboard for a printer. The height of the keyboard plays a significant role in this regard. It has been found that an inclination angle of 6 degrees from horizontal is functionally preferable in general for an average size operator using a keyboard having a keyboard height (measured at the center row of keys) of 30 mm. However, keyboards fixed with an inclination angle of 6 degrees only meet the optimal ergonomic standards of one category of work place and operator. Since typical keyboards are not con-structed for ready height adjustment, adaptation to different work conditions is not possible or possible only after requiring sub-stantial time and expense for adjustment.
An object of the present invention is to enable a key-board operator to adjust the angle of inclination of a keyboard to suit the particular working conditions. Further objects are to make adjustments easy to carry out at any time at a work place to suit the personal needs of the operator and cause the adjustments to be done with means which keep structural expenses to a minimum.
These objects are achieved in the present invention.
S~MMARY OF THE INVENTION
The invention provides apparatus for adjusting the inclination angle of a keyboard having a housing and a generally planar working face for a bank of keys, comprising a laterally extending adjustment shaft mounted for rotation adjacent one end (~ ~
1 ~475~
of said keyboard housing, at least two matching eccentric cam plates disposed and aligned to provide equal lift for rotation on said adjustment shaft at opposed ends thereof for forming seating support surfaces for said one end of said keyboard housing, and control means for enabling selective rotation of said adjustment shaft to infinitely vary the inclination of said keyboard housing between minimum and maximum values as defined by the eccentricity of said cam plates, wherein said control means comprises a rotatable control shaft entirely within said keyboard housing having a first gear member disposed thereon for driving interconnection with a second gear member disposed on said adjustment shaft, and wherein said control means further comprises a hand wheel disposed for rotation on said control shaft, said housing having a recess per-mitting operator access to said hand wheel. The assembly entails a minimum of mechanical features, thus keeping structural outlay to a minimum and guaranteeing a nearly maintenance free operation.
Snap locks are preferably provided in the keyboard hous-ing to seat the adjustment shaft and control shaft. The provision of snap locks further minimizes the cost of fabrication and assem-bly for the adjustment assembly, while still guaranteeing secure seating.
Figure 1 is partly broken-away side elevational view of a keyboard having an adjustment assembly in its lowered position according to the present invention.
Figure 2 is a cross-sectional view taken along the lines A-B of Figure 1.
Figure 3 is a side elevational view of the keyboard of Figure 1 when the adjustment assembly is in its maximum raised 1l747~8 posltion .
DESCRIPTION OF THE PREFERRED EMBODI~ENT
Figures 1 and 2 illustrate a keyboard K, such as for a telex machine or a type-keyboard for an office printer, having base and upper housing parts 1 and 2, respectively, and a bank of keys 3 along the working face of the keyboard. The housing parts, especially the base part 1, are preferably plastic molded. The working face may be minimally inclined at an angle of 6 degrees with respect to a work place or support surface 4~
At the front end of the keyboard K are provided shallow, fixed seating elements or blocks 5. At the back end of the key-board is an adjustment assembly A, which enables the back end to be raised and lowered relative to the front end -2a-l 17~75~
so that inclination of the working face may be variably increased or lowered to suit the particular ergonomic demands of individual operators and work place.
The adjustment assembly A contains two spaced-apart seating elements in the form of matching cam plates 6 and 7 disposed on an adjustment shaft 8.
The adjustment shaft is an elongated rod having a polygonal cross-section, such as square or hexagonal, and contains centering or stop portions 9 and 10 posi-tioned outside of the cam plates 6 and 7. The stops 9 and 10 fit in correspond-ingly shaped recesses formed in the bottom surface of the base housing 1.
A lateral helical gear member 11 is provided about the shaft 8 ad-jacent at least one cam plate 6 for driving interconnection with a further helical gear member 12 mounted on an axially extending control shaft 13.
Opposed bearing ends 14 and 15 of the control shaft are seated in correspond-ingly shaped recesses in the bottom surface of the base 1. Located in an access space adjacent the back end of the keyboard K is a hand wheel 16, having a grooved surface for manual operation. The hand wheel 16 is fitted onto the control shaft 13 and permits an operator to manually rotate the control shaft~
thus actuating adjustment of the cam plate seatings 6 and 7.
Operation of the adjustment assembly is as follows. By turning the hand wheel 16, the cam plate 6 is rotated on the adjustment shaft 8 via the control shaft 13 and the two gears 12 and 11. The cam plate 7, connected for rotation with the shaft 8, is likewise rotated with the cam plate 6. Due to the eccentric shape of the cam plates 6 and 7, the keyboard K is elevated at one endand the angle of inclination is increased. Adjustment of the angle of inclina-tion can ensue infinitely between a minimum and a maximum value, here shown, forexample, to be between 6 and 12. The gear ~eeth 11 and 12 are designed as helical gearings and, as a result of their interlock, prevent free reversal or return of the control shaft 13. The minimum limitation value of the angle of ~ ~7475~
inclination is limited by means of the bottom surface edges in the lower part 1 of the keyboard housing with which the shallow eccentric portions of the cam plates 6 and 7 may be matched. The maximum inclination angle is limited by the degree of eccentricity provided on the cam plates 6 and 7. An example in which the keyboard is inclined to a maximum angle of inclination of 12 with respect to the stable surface 4 is shown in Figure 3.
The adjustment shaft 8 is preferably seated at one end in the base housing 1 by snap-lock means comprising a resilient clamp-like projection 17 for retaining a tappet end 18 of the shaft 8. At the other end of the shaft 8, a tappet end 19 rests on a ledge 20 formed on the base part 1 of the housing. To assemble, the tappet end 19 is first brought into engagement with the housing ledge 20. Then, the tappet 18 is snapped into the resilient projection 17.
Attachment of the control shaft 13 in the housing occurs in a similar manner with a resilient snap-lock clamp 21 holding the shaft 13 generally inter-mediately along its length against housing support ledges at the opposed shaft ends. Thus, the assembly shafts 8 and 13 can be easily snapped into position beneath the keyboard K.
The cam plates 6 and 7 are put in place on the shaft 8 with mountings which fit over the shaft, this being particularly simple when a square rod is employed as the shaft 8.
A material, for example a rubber ring~ which increases the friction between the seating elements and the stable surface 4 may be applied to the outer surfaces of the cam plates 6 and 7 in order to increase stability.
The adjustment assembly A of the present invention is readily adapt-able to different keyboards having varying widths by simply using an adjustment shaft 8 having the appropriate length.
Although various minor modifications may be suggested by those versed ..~17~758 in the art, it should be understood that we wish to embody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of our contribution to the art.
Increasingly, ergonomic demands are playing a role in the construction and use of keyboards, such as a telex machine or a type-keyboard for a printer. The height of the keyboard plays a significant role in this regard. It has been found that an inclination angle of 6 degrees from horizontal is functionally preferable in general for an average size operator using a keyboard having a keyboard height (measured at the center row of keys) of 30 mm. However, keyboards fixed with an inclination angle of 6 degrees only meet the optimal ergonomic standards of one category of work place and operator. Since typical keyboards are not con-structed for ready height adjustment, adaptation to different work conditions is not possible or possible only after requiring sub-stantial time and expense for adjustment.
An object of the present invention is to enable a key-board operator to adjust the angle of inclination of a keyboard to suit the particular working conditions. Further objects are to make adjustments easy to carry out at any time at a work place to suit the personal needs of the operator and cause the adjustments to be done with means which keep structural expenses to a minimum.
These objects are achieved in the present invention.
S~MMARY OF THE INVENTION
The invention provides apparatus for adjusting the inclination angle of a keyboard having a housing and a generally planar working face for a bank of keys, comprising a laterally extending adjustment shaft mounted for rotation adjacent one end (~ ~
1 ~475~
of said keyboard housing, at least two matching eccentric cam plates disposed and aligned to provide equal lift for rotation on said adjustment shaft at opposed ends thereof for forming seating support surfaces for said one end of said keyboard housing, and control means for enabling selective rotation of said adjustment shaft to infinitely vary the inclination of said keyboard housing between minimum and maximum values as defined by the eccentricity of said cam plates, wherein said control means comprises a rotatable control shaft entirely within said keyboard housing having a first gear member disposed thereon for driving interconnection with a second gear member disposed on said adjustment shaft, and wherein said control means further comprises a hand wheel disposed for rotation on said control shaft, said housing having a recess per-mitting operator access to said hand wheel. The assembly entails a minimum of mechanical features, thus keeping structural outlay to a minimum and guaranteeing a nearly maintenance free operation.
Snap locks are preferably provided in the keyboard hous-ing to seat the adjustment shaft and control shaft. The provision of snap locks further minimizes the cost of fabrication and assem-bly for the adjustment assembly, while still guaranteeing secure seating.
Figure 1 is partly broken-away side elevational view of a keyboard having an adjustment assembly in its lowered position according to the present invention.
Figure 2 is a cross-sectional view taken along the lines A-B of Figure 1.
Figure 3 is a side elevational view of the keyboard of Figure 1 when the adjustment assembly is in its maximum raised 1l747~8 posltion .
DESCRIPTION OF THE PREFERRED EMBODI~ENT
Figures 1 and 2 illustrate a keyboard K, such as for a telex machine or a type-keyboard for an office printer, having base and upper housing parts 1 and 2, respectively, and a bank of keys 3 along the working face of the keyboard. The housing parts, especially the base part 1, are preferably plastic molded. The working face may be minimally inclined at an angle of 6 degrees with respect to a work place or support surface 4~
At the front end of the keyboard K are provided shallow, fixed seating elements or blocks 5. At the back end of the key-board is an adjustment assembly A, which enables the back end to be raised and lowered relative to the front end -2a-l 17~75~
so that inclination of the working face may be variably increased or lowered to suit the particular ergonomic demands of individual operators and work place.
The adjustment assembly A contains two spaced-apart seating elements in the form of matching cam plates 6 and 7 disposed on an adjustment shaft 8.
The adjustment shaft is an elongated rod having a polygonal cross-section, such as square or hexagonal, and contains centering or stop portions 9 and 10 posi-tioned outside of the cam plates 6 and 7. The stops 9 and 10 fit in correspond-ingly shaped recesses formed in the bottom surface of the base housing 1.
A lateral helical gear member 11 is provided about the shaft 8 ad-jacent at least one cam plate 6 for driving interconnection with a further helical gear member 12 mounted on an axially extending control shaft 13.
Opposed bearing ends 14 and 15 of the control shaft are seated in correspond-ingly shaped recesses in the bottom surface of the base 1. Located in an access space adjacent the back end of the keyboard K is a hand wheel 16, having a grooved surface for manual operation. The hand wheel 16 is fitted onto the control shaft 13 and permits an operator to manually rotate the control shaft~
thus actuating adjustment of the cam plate seatings 6 and 7.
Operation of the adjustment assembly is as follows. By turning the hand wheel 16, the cam plate 6 is rotated on the adjustment shaft 8 via the control shaft 13 and the two gears 12 and 11. The cam plate 7, connected for rotation with the shaft 8, is likewise rotated with the cam plate 6. Due to the eccentric shape of the cam plates 6 and 7, the keyboard K is elevated at one endand the angle of inclination is increased. Adjustment of the angle of inclina-tion can ensue infinitely between a minimum and a maximum value, here shown, forexample, to be between 6 and 12. The gear ~eeth 11 and 12 are designed as helical gearings and, as a result of their interlock, prevent free reversal or return of the control shaft 13. The minimum limitation value of the angle of ~ ~7475~
inclination is limited by means of the bottom surface edges in the lower part 1 of the keyboard housing with which the shallow eccentric portions of the cam plates 6 and 7 may be matched. The maximum inclination angle is limited by the degree of eccentricity provided on the cam plates 6 and 7. An example in which the keyboard is inclined to a maximum angle of inclination of 12 with respect to the stable surface 4 is shown in Figure 3.
The adjustment shaft 8 is preferably seated at one end in the base housing 1 by snap-lock means comprising a resilient clamp-like projection 17 for retaining a tappet end 18 of the shaft 8. At the other end of the shaft 8, a tappet end 19 rests on a ledge 20 formed on the base part 1 of the housing. To assemble, the tappet end 19 is first brought into engagement with the housing ledge 20. Then, the tappet 18 is snapped into the resilient projection 17.
Attachment of the control shaft 13 in the housing occurs in a similar manner with a resilient snap-lock clamp 21 holding the shaft 13 generally inter-mediately along its length against housing support ledges at the opposed shaft ends. Thus, the assembly shafts 8 and 13 can be easily snapped into position beneath the keyboard K.
The cam plates 6 and 7 are put in place on the shaft 8 with mountings which fit over the shaft, this being particularly simple when a square rod is employed as the shaft 8.
A material, for example a rubber ring~ which increases the friction between the seating elements and the stable surface 4 may be applied to the outer surfaces of the cam plates 6 and 7 in order to increase stability.
The adjustment assembly A of the present invention is readily adapt-able to different keyboards having varying widths by simply using an adjustment shaft 8 having the appropriate length.
Although various minor modifications may be suggested by those versed ..~17~758 in the art, it should be understood that we wish to embody within the scope of the patent warranted hereon all such modifications as reasonably and properly come within the scope of our contribution to the art.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for adjusting the inclination angle of a key-board having a housing and a generally planar working face for a bank of keys, comprising a laterally extending adjustment shaft mounted for rotation adjacent one end of said keyboard housing, at least two matching eccentric cam plates disposed and aligned to provide equal lift for rotation on said adjustment shaft at opposed ends thereof for forming seating support surfaces for said one end of said keyboard housing, and control means for enabling selective rotation of said adjustment shaft to infinitely vary the inclina-tion of said keyboard housing between minimum and maximum values as defined by the eccentricity of said cam plates, wherein said control means comprises a rotatable control shaft entirely within said keyboard housing having a first gear member disposed thereon for driving interconnection with a second gear member disposed on said adjustment shaft, and wherein said control means further comprises a hand wheel disposed for rotation on said control shaft, said housing having a recess permitting operator access to said hand wheel.
2. The apparatus of claim 1, wherein said first and second gear members have helical gear teeth.
3. The apparatus of claim 1, further comprising tappets formed at opposed ends of said adjustment shaft and at least one resilient snap-lock means formed in said housing for retaining one corresponding tappet to support said adjustment shaft in said housing.
4. The apparatus of claim 3, wherein one snap-lock means is provided at one end of said adjustment shaft and the tappet at the other end of said adjustment shaft is supported on a housing ledge surface.
5. The apparatus of claim 3, further comprising resilient snap-lock means for supporting said control shaft in said housing.
6. The apparatus of claim 1, 2 or 3, wherein said adjustment shaft is of a polygonal cross-section.
7. The apparatus of claim 1, wherein each said cam plate is coated with material means for increasing the seating surface friction of said cam plates.
8. The apparatus of claim 7, wherein said material means is a rubber ring.
9. The apparatus of claim 1, 2 or 3, wherein said adjustment shaft is positioned adjacent the back end of said housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3014423.1 | 1980-04-15 | ||
| DE3014423A DE3014423C2 (en) | 1980-04-15 | 1980-04-15 | Device for adjusting the inclination of a keyboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1174758A true CA1174758A (en) | 1984-09-18 |
Family
ID=6100057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000375350A Expired CA1174758A (en) | 1980-04-15 | 1981-04-13 | Device for adjusting the slope of a keyboard |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4402624A (en) |
| EP (1) | EP0037846B1 (en) |
| JP (1) | JPS56164434A (en) |
| CA (1) | CA1174758A (en) |
| DE (1) | DE3014423C2 (en) |
| DK (1) | DK213980A (en) |
Families Citing this family (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1144971B (en) * | 1981-10-21 | 1986-10-29 | Olivetti & Co Spa | CONTACT KEYBOARD |
| SE431955B (en) * | 1982-07-28 | 1984-03-12 | Ericsson Telefon Ab L M | KEYBOARD FOR TERMINALS, PRINTING MACHINES AND LIKE |
| US4571456B1 (en) * | 1982-10-18 | 1995-08-15 | Grid Systems Corp | Portable computer |
| US4527149A (en) * | 1983-01-28 | 1985-07-02 | Texas Instruments Incorporated | Data display keyboard with angular positioning |
| US4615629A (en) * | 1984-04-24 | 1986-10-07 | Power Daniel J | Input keyboard |
| US4637322A (en) * | 1985-02-20 | 1987-01-20 | Rubbermaid Commercial Products Inc. | Adjustable computer work table |
| US4773783A (en) * | 1985-03-15 | 1988-09-27 | Northern Technologies, Ltd. | Computer keyboard including attitude adjusting mechanism and a strip label |
| US4693444A (en) * | 1985-07-22 | 1987-09-15 | Intergraph Corporation | Height adjust mechanism |
| IT1187888B (en) * | 1986-01-31 | 1987-12-23 | Olivetti & Co Spa | DEVICE TO ADJUST THE INCLINATION OF A KEYBOARD |
| DE3606606A1 (en) * | 1986-02-28 | 1987-09-03 | Tandberg Data | KEYBOARD |
| US5339097A (en) * | 1986-10-21 | 1994-08-16 | Grant Alan H | Computer keyboard |
| US5416498A (en) * | 1986-10-21 | 1995-05-16 | Ergonomics, Inc. | Prehensile positioning computer keyboard |
| IT1222937B (en) * | 1987-10-19 | 1990-09-12 | Honeywell Bull Spa | PRINTER AND RELATED MULTIFUNCTIONAL SUPPORT |
| DE3901515A1 (en) * | 1989-01-19 | 1990-07-26 | Phywe Systeme Gmbh | APPLIANCE HOUSING WITH TWO HOUSING SHELLS |
| US5067834A (en) * | 1989-07-07 | 1991-11-26 | Szmanda Jeffrey P | Input keyboard apparatus for information processing device and other keyboard devices |
| US5466078A (en) * | 1989-07-07 | 1995-11-14 | Health Care Keyboard Company | Input keyboard apparatus for information processing and other keyboard devices |
| US5239444A (en) * | 1989-10-20 | 1993-08-24 | Kabushiki Kaisha Toshiba | Tiltable portable electronic apparatus with sliding tilt leg |
| US5294013A (en) * | 1989-10-20 | 1994-03-15 | Kabushiki Kaisha Toshiba | Portable electronic apparatus |
| US5541593A (en) * | 1992-07-02 | 1996-07-30 | Arsem; A. Donald | Computer keyboard |
| US5342005A (en) * | 1992-11-05 | 1994-08-30 | Health Care Keyboard Co., Inc. | Arm support apparatus for keyboard and other apparatus requiring repetitive hand operation |
| US6296408B1 (en) * | 1993-08-05 | 2001-10-02 | Stephen F. Larkin | Programmed motion work station |
| US5454652A (en) * | 1993-11-12 | 1995-10-03 | Lexmark International, Inc. | Adjustable keyboard |
| US5483898A (en) * | 1994-02-24 | 1996-01-16 | Krueger International | Tilting and sliding surface assembly for a table |
| US5601014A (en) * | 1995-06-28 | 1997-02-11 | Vestil Manufacturing Company | Lift and tilt table |
| US5735618A (en) * | 1997-01-21 | 1998-04-07 | Dell U.S.A., L.P. | Method and apparatus for adjusting height of keyboard |
| JP2001290577A (en) * | 2000-04-06 | 2001-10-19 | Alps Electric Co Ltd | Keyboard device |
| US7338224B2 (en) * | 2005-06-03 | 2008-03-04 | Microsoft Corporation | Ergonomic keyboard apparatus |
| CN100395687C (en) * | 2005-11-28 | 2008-06-18 | 华硕电脑股份有限公司 | Height regulating mechanism |
| JP2011508934A (en) * | 2008-01-03 | 2011-03-17 | エルゴワークス インターナショナル， エルエルシー． | keyboard |
| US20110050574A1 (en) * | 2009-08-25 | 2011-03-03 | Dean Depay | Keyboard and tilt adjustment device therefore |
| CN102129299B (en) * | 2010-01-16 | 2012-10-10 | 鸿富锦精密工业（深圳）有限公司 | Electronic equipment with supporting device |
| TWI513993B (en) | 2013-03-26 | 2015-12-21 | Ind Tech Res Inst | 3-axis magnetic field sensor, fabrication method of magnetic sensing structure and magnetic field sensing circuit |
| CN109002078B (en) * | 2017-06-07 | 2021-05-11 | 光宝电子(广州)有限公司 | Electronic device |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1331441A (en) * | 1920-02-17 | Typewriting-machiite | ||
| US2540297A (en) * | 1951-02-06 | Collapsible office machine frame | ||
| US726921A (en) * | 1901-08-31 | 1903-05-05 | Elliott & Hatch Book Typewriter Company | Book-type-writer table. |
| US1385256A (en) * | 1921-02-23 | 1921-07-19 | Joseph H Mccann | Dummy keyboard |
| AT95908B (en) * | 1921-11-25 | 1924-02-11 | Adolf Ing Reiszer | Portable typewriter. |
| US1676809A (en) * | 1925-02-21 | 1928-07-10 | Albert Voigt | Typewriting machine |
| FR736177A (en) * | 1931-08-03 | 1932-11-21 | Apparatus for lifting the wheels of motor vehicles | |
| US2281769A (en) * | 1940-08-07 | 1942-05-05 | Public Scale Company | Leveling device for scales and other objects |
| US2451722A (en) * | 1945-02-24 | 1948-10-19 | Ibm | Power-operated skip tabulating mechanism for typewriting machines |
| US2979857A (en) * | 1959-03-10 | 1961-04-18 | Longbotham Thomas | Base leveling device |
| DE1806282U (en) * | 1959-08-28 | 1960-02-18 | Max Braun Fa | TILTING DEVICE. |
| US3069543A (en) * | 1960-10-07 | 1962-12-18 | Chirana Praha | Tiltable wall or table as used in x-ray examinations |
| US3253697A (en) * | 1964-07-13 | 1966-05-31 | Rapids Standard Co Inc | Variable pressure conveyor |
| US3750989A (en) * | 1971-07-19 | 1973-08-07 | Maytag Co | Adjustable appliance support |
| US3830352A (en) * | 1972-10-02 | 1974-08-20 | Ibm | Articulated typewriter frame |
| US3902034A (en) * | 1974-04-03 | 1975-08-26 | Ncr Co | Adjustable keyboard |
| DE2539061A1 (en) * | 1975-09-03 | 1977-03-17 | Gisela Winkler | Keyboard operated office machine esp. typewriter - has keyboard projecting from edge of table and adjustable in height to suit operator |
| US4008920A (en) * | 1976-02-23 | 1977-02-22 | Uop Inc. | Seat back adjuster |
-
1980
- 1980-04-15 DE DE3014423A patent/DE3014423C2/en not_active Expired
- 1980-05-09 EP EP80102592A patent/EP0037846B1/en not_active Expired
- 1980-05-16 DK DK213980A patent/DK213980A/en unknown
-
1981
- 1981-03-27 US US06/248,243 patent/US4402624A/en not_active Expired - Fee Related
- 1981-04-13 CA CA000375350A patent/CA1174758A/en not_active Expired
- 1981-04-15 JP JP5690281A patent/JPS56164434A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DK213980A (en) | 1981-10-16 |
| EP0037846A2 (en) | 1981-10-21 |
| DE3014423A1 (en) | 1981-10-22 |
| US4402624A (en) | 1983-09-06 |
| EP0037846A3 (en) | 1981-11-04 |
| JPS56164434A (en) | 1981-12-17 |
| EP0037846B1 (en) | 1984-02-29 |
| DE3014423C2 (en) | 1983-10-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |