US3118705A - Adjustable desk and chair - Google Patents

Adjustable desk and chair Download PDF

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Publication number
US3118705A
US3118705A US66810A US6681060A US3118705A US 3118705 A US3118705 A US 3118705A US 66810 A US66810 A US 66810A US 6681060 A US6681060 A US 6681060A US 3118705 A US3118705 A US 3118705A
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US
United States
Prior art keywords
shaft
casing
seat
chair
desk
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 - Lifetime
Application number
US66810A
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English (en)
Inventor
Paul G Stalnacke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKRIVRIT AB
Original Assignee
SKRIVRIT AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to GB33821/60A priority Critical patent/GB887550A/en
Application filed by SKRIVRIT AB filed Critical SKRIVRIT AB
Priority to CH1225460A priority patent/CH380904A/de
Priority to US66810A priority patent/US3118705A/en
Priority to FR843425D priority patent/FR1273201A/fr
Application granted granted Critical
Publication of US3118705A publication Critical patent/US3118705A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00—Tables with tops of variable height
    • A47B9/04—Tables with tops of variable height with vertical spindle
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B41/00—School desks or tables
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/022—Reclining or easy chairs having independently-adjustable supporting parts
    • A47C1/023—Reclining or easy chairs having independently-adjustable supporting parts the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/24—Chairs or stools with vertically-adjustable seats with vertical spindle
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47D—FURNITURE SPECIALLY ADAPTED FOR CHILDREN
    • A47D1/00—Children's chairs
    • A47D1/002—Children's chairs adjustable
    • A47D1/004—Children's chairs adjustable in height
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2200/00—General construction of tables or desks
    • A47B2200/0011—Underframes
    • A47B2200/002—Legs
    • A47B2200/0026—Desks with C-shaped leg

Definitions

  • a feature of the present invention is to provide a desk or chair with such known telescopic legs adjustable by a screw spindle but the upper ends of all the screw spindles are without motion connection means, such as a chain, between them. Said ends are accessible at the top of the desk or chair and a separate transmission mechanism contains parallel shafts connected by motion transmitting means and of the same number and mutual distance as the number and mutual distance of the screw spindles, each end of the shafts projecting in the same direction being connectable with each said ends of the screw spindle, at least one of said shafts being provided with a crank handle or the like for manual actuation of the transmission mechanism actuating the screw spindles for adjusting the length of the legs.
  • one transmission mechanism is sufficient for a large number of desks or chairs.
  • the legs of the desk or chair are mutually parallel but simultaneously inclined relatively to the table top of the desk or seat of the chair so that a raising or lowering of the desk or chair causes a simultaneous horizontal movement of the table top or seat relative to the leg under portions.
  • the desk or chair can be adjusted in a horizontal as well as vertical direction to suit the size of a person.
  • Another feature of the invention is the provision of a catch at each shaft of the transmission mechanism, which catches are disengaged only by forcing the shafts against the ends of the screw spindles.
  • Still another feature of the invention is the provision of a construction for manufacturing the adjustable parts of the desk or chair in a simple and inexpensive manner and for adjustment of a large number of the desks or chairs in a handy manner by means of one and the same transmission mechanism for the several desks and chairs.
  • P16. 1 is a side view of a school desk according to the invention.
  • PEG. 2 is a top view of the school desk
  • FIG. 3 is a vertical section in a larger scale of one leg of the desk and adjacent parts
  • PEG. 4 is a section through the upper part of the desk and a transmission mechanism thereon, but with a midportion broken away;
  • FIG. 5 is a vertical section, similar to FIG. 3, of another embodiment of the transmission mechanism
  • FIG. 6 is a side view of a chair according to the invention.
  • FIG. 7 is a perspective view of another chair, according to the invention.
  • FIG. 8 is a longitudinal section in a larger scale of a part of a leg of the chair.
  • FIG. 9 is a side view of the chair in FIG. 7;
  • FIG. 10 is still another chair according to the invention.
  • an improved desk according to FIGS. 1 to 4 is provided with two parallel legs, each formed by a tubular leg underportion 1 and a tubular leg upper-portion 2 guided on the leg under-portion 1.
  • a plate 5 forming part of the table-top, the other part of which is formed by a desk lid 6 connected with the plate 5 by means of hinges and resting on the frame 3.
  • a transmission casing 8 that contains a sprocket wheel 9 above each leg 1, 2 and an endless chain 11 around the sprocket wheels and against a stretch roll 12.
  • the transmission casing 8 is placed upon the desk plate 5 and the sprocket wheel 9 is fastened to a shaft 18 that is journalled in bushings 19 and 20 fastened to the casing 8.
  • the shaft 18 and the sprocket wheel 9 are axially displaceable in the bearing bushings 19, 20 but the hub 21 of the sprocket wheel 9 resting against the bushing 19 is influenced by a spring 22 around the shaft 18 and is located between the sprocket wheel 9 and the bushing 2%).
  • In the bushing 19 are four holes 23 in which a retaining peg 24 alternatively can enter.
  • the shaft 1% in its lower end is provided with a shaft pin 25, for example hexagonal, projecting into the hole 16 of the screw spindle 18 and in its upper end also has a cornered hole 26, for example hexagonal, in which there is placed a crank handle 27.
  • a shaft pin 25 for example hexagonal
  • the crank handle 27 at the other sprocket wheel 9.
  • the legs 1, 2 are lengthened or shortened in the same degree for raising or lowering of the table top of the desk. If one or the other shaft pin 25 of the transmission mechanism has not been forced down to reach the bottom of the proper screw spindle hole 16, the proper shaft 18 does not get any support for permitting the bushing 19 to be drawn olf from the peg 24 when the casing 8 is pressed downwards and the sprocket wheel and also the shaft are being firmly engaged. Consequently, it is not possible to turn the shaft 18 or the screw spindle 14. This means there is security in that none of the sprocket wheel shafts can be turned until both are duly connected with its screw spindle 14 and thereafter turned to the same degree. The result is that the upper part of the desk and both legs are raised or lowered in equal degree and a bar to an incorrect inclination of the table surface has been achieved.
  • One single transmission mechanism according to the invention is sufficient for all the adjustable desks in, for example, a school.
  • the described desk may have a lower level of 21 inches and a higher level of 33 inches so that a desk can be adjusted not only for the pupil using it, but also in pace with a pupils proceeding growth.
  • the inclination of the legs 1, 2 has the effect that with a raising of the table top follows a movement of the table top away from the sitting place at the desk and the pupil will get more space.
  • each shaft 18 carrying a sprocket wheel 9 in engagement with the chain 11 is turnable but not displaceably journalled for axial movement in the casing 3.
  • the shaft ends are in engagement with the screw spindle 14 and one shaft 18 is provided with the crank handle 27.
  • a chair has two legs each formed by a tubular leg under-portion 31 and a tubular leg upperportion 32.
  • a seat 33 is attached to the portions 32 and is supported by a brace 34 at each leg.
  • the upper and lower-portions of each leg are mutually adjustable in the manner shown in FIG. 3 by means of an internal screw spindle the upper end of which is accessible through an aperture in the seat for application of the transmission mechanism according to FIGS. 3, 4 or 5.
  • a holder 35 is slidably mounted in said guide piece 35 and retained by a locking bolt 37.
  • the holder 3-5 carries a seat back 33.
  • there is one guide piece 35 only under the midportion of the seat but there could be two guide pieces each located at a leg.
  • the legs of the chair are inclined and the guide piece 35 has an approximate 39 angle to the seat 33, ie 120 to the seat back plane.
  • the seat causes a horizontal and a vertical displacement of the seat.
  • every displacement of the seat back relative to the seat causes an alteration of the position of the seat back in both a horizontal and vertical direction.
  • a chair according to FIGS. 7 to 9 is also provided with two parallel legs each consisting of a tubular leg underportion 31 and a tubular leg upper-portion 32 carrying a seat 33 supported by braces 34.
  • the legs contain, according to FIG. 8, a nut 39 in the upper end of the leg under-portion 31, a screw spindle 40 in engagement with the nut 39, a further screw spindle 41 firmly joined to the first mentioned screw spindle 40 and a nut 41 fastened to the inner end of the holder 36 and in engagement with the last-mentioned screw spindle 41.
  • Both spindles 40, 41 are turnably but not displaceably journalled for axial movement in two bearings 43.
  • the spindles 40, 41 are threaded in opposite directions so that a turning of the spindles. causes the nuts 39, 42 and thus the parts 31 and 36 to move towards or away from each other.
  • the upper ends of the screw spindles 41 are connectable with the above described transmission mechanism at the bending of the holder 36 behind the lower side of the seat back 38.
  • a raising of the seat 33 also causes a backward movement of the seat.
  • Each alteration of the level of seat back 38 is originally located straight above the upper end of the leg upper-portion 32, but simultaneously with the raising of the seat 33 the seat back 6 is not only raised but also displaced backwards a distance x from the upper end of the portions 32 or relatively to the seat 33.
  • the chair used in for example, a school, can be adjusted in such a way that the height of the seat is increased in step with the pupils growing and simultaneously, the space for the pupil to the desk is increased. Moreover, the seat back is raised, and moved backwards relative to the seat and the pupil will get the seat back on the right level and the seat space increased. It is therefore possible to use one and the same desk as a chair for a pupil during his whole time at school, and the particular desks and chairs in a class room can be adjusted to suit each particular pupil.
  • the chair according to FIG. 10 has the same adjusting parts as shown in FIG. 8, but the screw spindles in the legs are not firmly connected but linked, for example by a universal joint, bevel gears or the like between the bearings.
  • the seat back 38 has a larger horizontal movement than the seat 33 for each alteration of the levels of the seat back and the seat. A difference in the displacements of the seat and the seat back can be obtained by different pitch of the screw spindles too.
  • the transmission mechanism must have a shorter distance between its shafts for actuating the chair than for actuating the desk.
  • each leg may consist of two mutually guided bars and the transmission means between said shafts may be a steel wire, a V-belt or a shaft with gears or the like.
  • An adjustable height mechanism for tables and chairs having at least two legs comprising an upper leg portion and a lower leg portion for each leg, the upper portion being telescopically displaceable relative to the lower portion; a screw spindle rotatably attached within the upper leg portion at its upper end and extending into the lower leg portion, the spindle being threadedly mounted on a nut fixed to the upper end of the lower leg portion; shaft pin receiving means at the uppermost end of said spindle; and a removable transmission mechanism enclosed in a separate casing and comprising at least two shaft pins projecting from below said casing for simultaneous engagement with the respective pin receiving means of the spindles, and power transmitting means within the casing for simultaneous rotation of the pins, the power transmitting means comprising a shaft fixed to each of'the shaft pins at one end thereof, bushings rotatably attaching each shaft to the casing, each shaft being longitudinally displaceable in the casing, a sprocket wheel fixed to each shaft, a chain drive joining the sprocke
  • said catch means comprise a retaining peg projecting from at least one wheel engageable in holes in one of said bushings and a spring urging the engagement.
  • An adjustable height mechanism particularly for use in chairs with backs, and further comprising a chair back guiding means for guiding the chair back downward and forward relative to the chair seat when lowering the chair height and upward and backward relative to the chair seat when raising the chair height.
  • An adjustable height mechanism according to claim 1, particularly for use in chairs, having an adjustable back and further comprising an extension of the upper leg portion and a back attaching portion telescopingly displaceable relative to the extension of upper leg portion, wherein said spindle extends into the back attaching portion 7 and is threadedly mounted on a nut fixed to the back attaching portion.
  • an adjustable height mechanism comprising: at least two legs depending from the said horizontal portion, each leg including a tubular upper leg portion fixed to the horizontal portion and a tubular lower leg portion telescopically displaceable within the upper leg portion; a screw spindle rotatably attached within each upper leg portion at its upper end and extending into the respective lower leg portion; a nut fixed to the upper end of the lower leg portion, the nut being threadably mounted on the said spindle; shaft pin receiving means at the uppermost end of each spindle; means defining holes within the horizontal portion for access to the shaft pin receiving means from above the said horizontal portion; and a removable transmission mechanism including a casing separate from the said table or chair, at least two shaft pins projecting from below said casing for simultaneous engagement with the pin receiving means through the holes within the said horizontal portions, a shaft fixed to each of the shaft pins at one end thereof and bushings rotatably attaching each shaft to the cas
  • An adjustable height mechanism particularly for use in chairs, and further comprising a longitudinal back guide piece below and fixed to the said horizontal seat portion at an angle thereto, a back holder slideably mounted in the said guide piece, and a locking bolt for fixing the position of the holder relative to the said guide piece.
  • An adjustable height mechanism according to claim 7 wherein the guide piece is at an angle of approximately 30 to the horizontal seat portion, the guide piece being at an angle of to a seat back fixed to the back holder, the back being movable downward and forward relative to the seat portion when lowering its height and upward and backward relative to the seat portion when raising its height.
US66810A 1959-11-12 1960-11-02 Adjustable desk and chair Expired - Lifetime US3118705A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB33821/60A GB887550A (en) 1959-11-12 1960-10-03 A new or improved adjustable desk or chair
CH1225460A CH380904A (de) 1959-11-12 1960-11-02 Verstellbares Möbelstück, insbesondere für den Schulgebrauch
US66810A US3118705A (en) 1959-11-12 1960-11-02 Adjustable desk and chair
FR843425D FR1273201A (fr) 1959-11-12 1960-11-09 Pupitre et siège réglables

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE1060559 1959-11-12
SE356560 1960-04-11
GB33821/60A GB887550A (en) 1959-11-12 1960-10-03 A new or improved adjustable desk or chair
US66810A US3118705A (en) 1959-11-12 1960-11-02 Adjustable desk and chair

Publications (1)

Publication Number Publication Date
US3118705A true US3118705A (en) 1964-01-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US66810A Expired - Lifetime US3118705A (en) 1959-11-12 1960-11-02 Adjustable desk and chair

Country Status (4)

Country Link
US (1) US3118705A (de)
CH (1) CH380904A (de)
FR (1) FR1273201A (de)
GB (1) GB887550A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259081A (en) * 1962-05-10 1966-07-05 Skrivrit Ab School desk of adjustable height
US3393649A (en) * 1967-08-10 1968-07-23 Miotke Norbert Combination reading stand and utility table
US4240663A (en) * 1978-10-14 1980-12-23 Giroflex Entwicklungs Ag Adjustable stacking chair
US4285281A (en) * 1978-05-19 1981-08-25 Frick Berndt Ebbe Table and a table support
US4516509A (en) * 1981-06-24 1985-05-14 Embru-Werke, Mantel & Cie. Office furniture with an adjustable tabletop in modular design for setup at the work place
US5007630A (en) * 1988-10-07 1991-04-16 Precor Incorporated Exercise treadmill
EP2241255A2 (de) 2009-04-15 2010-10-20 Medison Co., Ltd. Höheneinstellungsvorrichtung für eine Bildgebungsvorrichtung
EP3042588A1 (de) * 2015-01-12 2016-07-13 Cheng-Fan Yang Stuhl für kleinkinder
EP3172989A1 (de) * 2015-11-26 2017-05-31 Drentea Kantoormeubelen B.V. Tisch mit höhenverstellbarer tischplatte
US10034538B1 (en) 2017-05-05 2018-07-31 Sauder Woodworking Co. Height-adjustable work surface assembly
RU2812214C1 (ru) * 2023-04-04 2024-01-25 Сергей Польекторович Григорьевых Школьная парта - стол, стул

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5489138A (en) * 1993-10-01 1996-02-06 Lisco, Inc. Height adjustable high chair
GB2465169A (en) * 2008-11-06 2010-05-12 Therefore Ltd Adjustable chairs

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US545827A (en) * 1895-09-03 Screwing and boring hand-tool
US914538A (en) * 1907-12-28 1909-03-09 Heywood Brothers And Wakefield Company Adjustable furniture.
US919559A (en) * 1908-10-09 1909-04-27 Albert A Duff Adjustable piano-bench.
US968449A (en) * 1909-02-23 1910-08-23 Theodor Kundtz Vertically-adjustable support.
US1237499A (en) * 1914-07-10 1917-08-21 John R Gammeter Adjustable piano-bench.
US1263435A (en) * 1918-02-19 1918-04-23 Henry H Klingbiel Wrench.
US1356555A (en) * 1919-06-26 1920-10-26 Oringderff Walter Chain-driven wrench
US1731375A (en) * 1926-01-30 1929-10-15 Engers Arnold Combined adjustable desk and seat
US1943280A (en) * 1932-06-10 1934-01-16 Harold A Arnold Table
US2368748A (en) * 1943-02-19 1945-02-06 Hard Mfg Company Over-bed table
US2553939A (en) * 1949-04-01 1951-05-22 Pivovaroff William Article of furniture and hoisting and transporting device therefor
US2721106A (en) * 1952-11-04 1955-10-18 Interstate Engineering Corp Vertically adjustable table

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US545827A (en) * 1895-09-03 Screwing and boring hand-tool
US914538A (en) * 1907-12-28 1909-03-09 Heywood Brothers And Wakefield Company Adjustable furniture.
US919559A (en) * 1908-10-09 1909-04-27 Albert A Duff Adjustable piano-bench.
US968449A (en) * 1909-02-23 1910-08-23 Theodor Kundtz Vertically-adjustable support.
US1237499A (en) * 1914-07-10 1917-08-21 John R Gammeter Adjustable piano-bench.
US1263435A (en) * 1918-02-19 1918-04-23 Henry H Klingbiel Wrench.
US1356555A (en) * 1919-06-26 1920-10-26 Oringderff Walter Chain-driven wrench
US1731375A (en) * 1926-01-30 1929-10-15 Engers Arnold Combined adjustable desk and seat
US1943280A (en) * 1932-06-10 1934-01-16 Harold A Arnold Table
US2368748A (en) * 1943-02-19 1945-02-06 Hard Mfg Company Over-bed table
US2553939A (en) * 1949-04-01 1951-05-22 Pivovaroff William Article of furniture and hoisting and transporting device therefor
US2721106A (en) * 1952-11-04 1955-10-18 Interstate Engineering Corp Vertically adjustable table

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259081A (en) * 1962-05-10 1966-07-05 Skrivrit Ab School desk of adjustable height
US3393649A (en) * 1967-08-10 1968-07-23 Miotke Norbert Combination reading stand and utility table
US4285281A (en) * 1978-05-19 1981-08-25 Frick Berndt Ebbe Table and a table support
US4240663A (en) * 1978-10-14 1980-12-23 Giroflex Entwicklungs Ag Adjustable stacking chair
US4516509A (en) * 1981-06-24 1985-05-14 Embru-Werke, Mantel & Cie. Office furniture with an adjustable tabletop in modular design for setup at the work place
US5007630A (en) * 1988-10-07 1991-04-16 Precor Incorporated Exercise treadmill
EP2241255A2 (de) 2009-04-15 2010-10-20 Medison Co., Ltd. Höheneinstellungsvorrichtung für eine Bildgebungsvorrichtung
US20100268079A1 (en) * 2009-04-15 2010-10-21 Kyeong Gu Woo Height Adjustment Device for Imaging Apparatus
EP2241255A3 (de) * 2009-04-15 2010-11-03 Medison Co., Ltd. Höheneinstellungsvorrichtung für eine Bildgebungsvorrichtung
US8631747B2 (en) 2009-04-15 2014-01-21 Samsung Medison Co., Ltd. Height adjustment device for imaging apparatus
EP3042588A1 (de) * 2015-01-12 2016-07-13 Cheng-Fan Yang Stuhl für kleinkinder
EP3172989A1 (de) * 2015-11-26 2017-05-31 Drentea Kantoormeubelen B.V. Tisch mit höhenverstellbarer tischplatte
NL2015857B1 (nl) * 2015-11-26 2017-06-13 Drentea Kantoormeubelen B V Tafel met een in hoogte instelbaar blad
US10034538B1 (en) 2017-05-05 2018-07-31 Sauder Woodworking Co. Height-adjustable work surface assembly
RU2812214C1 (ru) * 2023-04-04 2024-01-25 Сергей Польекторович Григорьевых Школьная парта - стол, стул

Also Published As

Publication number Publication date
CH380904A (de) 1964-08-15
GB887550A (en) 1962-01-17
FR1273201A (fr) 1961-10-06

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