US3881771A - Convertible chair - Google Patents

Convertible chair Download PDF

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Publication number
US3881771A
US3881771A US355082A US35508273A US3881771A US 3881771 A US3881771 A US 3881771A US 355082 A US355082 A US 355082A US 35508273 A US35508273 A US 35508273A US 3881771 A US3881771 A US 3881771A
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US
United States
Prior art keywords
bar
pivotally connected
seat
linkage
crank
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
US355082A
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English (en)
Inventor
Daniel Amstutz
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3881771A publication Critical patent/US3881771A/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
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
    • A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
    • A47C1/03211—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by electric motors
    • 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
    • A47B85/00—Furniture convertible into other kinds of furniture
    • A47B85/04—Tables convertible into chairs
    • 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
    • A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
    • A47C1/034—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest

Definitions

  • Convertible chairs are well known, some of which are manually operated by a lever and held in position by a screw, and some of which are semi-automatic, but limited in movement. In this case they are elevated by a hydraulic cylinder and their position is modified by a screw actuated by a crank.
  • the chair according to the invention comprises a back, a seat, and a leg support which are pivotally connected to each other.
  • the seat is supported on movable platform by means of shaft pivotally connecting the seat thereto.
  • This supporting platform is carried and guided by shafts sliding in the upper platform of a stationary frame beneath the supporting platform of the chair. Suitable stops make it possible to maintain a constant space between the upper platform of the stationary frame and the movable supporting platform of the chair so that the chair may be transformed by the deformation of a double deformable articulated parallelogram on which the back, seat and leg support are mounted.
  • This parallelogram comprises a bar carrying the back, which arm is connected at one end to a crossbar supporting the back and at its other end to another cross bar serving as an arm rest.
  • the crossbar serving as an arm rest is then connected to a second bar.
  • This second bar is connected to a bar supporting the seat by means of a shaft which is attached to a crank one end of which is attached to the bar supporting the arm rest. while its other end is pivotally attached to a connecting rod.
  • a crossbar connected to the crossbar supporting the arm rest, which is connected to the bar supporting the seat.
  • the connecting rod which controls the movement of the crank and the deformation of the articulated double parallelogram consisting of the bars and the crossbars changes the position of the seat and is pivotally attached to a movable plate guided by two shafts serving as supporting guides.
  • This movable plate is mounted on a threaded screw which is supported on the platform of the fixed frame and attached at its lower end to a pulley held in a base connected by a belt to a motor which, when it transmits its movement to the threaded screw, moves the movable plate through the connecting rod and crank to displace the bar to which it is attached and deform the double articulated parallelogram and change the position of the chair.
  • Telescopic arms are pivotally attached to this movable plate and determine the position of the seat to the extent that the movable plate is moved.
  • the space between the platform of the fixed frame and the supporting plate of the chair makes it possible to convert the chair from a normal position to a horizontal position while passing through a reclining position before the slide members of the movable plate come into contact with the supporting platform of the seat, which lifts the seat into a horizontal position to the extent that the movable platform is moved by the screw.
  • the crossbars are telescopic.
  • the screw may be actuated by a manual crank permitting conversion of the chair.
  • the device for starting the motor may be controlled by a pedal actuated by a person other than the one seated in the chair, which may be replaced by electrical contacts positioned on one of the arm rests of the chair so that the seated person may voluntarily control the conversion of the chair.
  • the attached drawing is a schematic side view of a preferred embodiment of my invention.
  • This chair comprises a stationary frame 1.
  • a threaded screw 2 is joumalled in the upper platform 3 of the frame 1 and its lower end is driven by a pulley 4 driven by a motor 5 through a belt 6.
  • a movable plate 7 is mounted on this screw and moves axially of the screw as the screw rotates. It is guided by guides 8 extending through the platform 3 of the frame 1.
  • the movable plate 7 is pivotally attached to a connecting rod 9 and telescopic rods 10 and 11.
  • the connecting rod 9 is connected to a crank 12 fixed to a pin 27 which is itself fixed to a bar 13 of a deformable articulated double parallelogram 13A but joumalled in bar 19 of the same parallelogram.
  • These bars 13 serve to hold the crossbars 14 supporting the arm rests 15 and the crossbar 16 holding the cross-bar 17 to which the leg support 18 is attached.
  • This crossbar 17 is connected to the bar 19 holding the seat 20, which is itself pivotally connected to the arm 13 perpendicularly to the crank 12.
  • a crossbar 21 is connected to the crossbar 14 supporting the arm rest 15.
  • This crossbar 21 serves to support the back 22.
  • the seat 20 and the bar 19 are pivotally connected to the movable platform 23 by a shaft 24.
  • the movable platform 23 is supported and guided by shafts 25 which slide in the platform 3 of the stationary frame 1. Stops 26 on the stationary platform 3 hold the two platforms 3 and 23 apart when the seat is being converted.
  • the invention described may be applied to all sorts of chairs and particularly when it is desired to provide a chair making it possible to obtain a seated, relaxed, or high or low horizontal position. Particularly valuable applications lie in the medical, surgical, and paramedical fields.
  • the chair may also be used in beauty parlors and by invalids.
  • Convertible chair comprising a seat, a back pivotally connected to the rear of said seat, and a leg rest pivotally connected to the front of said seat, double parallelogram linkage supporting said seat, back, and leg rest, said linkage comprising a first main bar supporting said seat and common to two parallelograms of said linkage, a second main bar pivotally connected near the center of said first main bar, and also common to both parallelograms of said linkage, a first shorter bar pivotally connected to one end of said first main bar and supporting said back, a second shorter bar pivotally connected to one end of said second main bar and one end of said first shorter bar to form a first parallelogram, a third shorter bar pivotally connected to the other end of said first main bar and supporting said leg rest, and a fourth shorter bar pivotally connected at one end to the other end of said second main bar and at the other end to said third shorter bar, a stationary platform, a movable platform mounted to slide vertically relative to said stationary platform, said seat being pivotally attached to said movable platform, motor driven screw
  • said screw means comprises a vertical screw which rotates in a nut pivotally connected to the end of said crank remote from the connection of said crank to one of said main bars.
  • chair as claimed in claim 2 comprising two telescopic rods, one end of each rod being pivotally connected to said first main bar and the other end of each rod being pivotally connected to said nut.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Special Chairs (AREA)
  • Chairs Characterized By Structure (AREA)
US355082A 1972-04-27 1973-04-27 Convertible chair Expired - Lifetime US3881771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7215780A FR2182678A1 (enrdf_load_stackoverflow) 1972-04-27 1972-04-27

Publications (1)

Publication Number Publication Date
US3881771A true US3881771A (en) 1975-05-06

Family

ID=9097945

Family Applications (1)

Application Number Title Priority Date Filing Date
US355082A Expired - Lifetime US3881771A (en) 1972-04-27 1973-04-27 Convertible chair

Country Status (7)

Country Link
US (1) US3881771A (enrdf_load_stackoverflow)
JP (1) JPS4942460A (enrdf_load_stackoverflow)
BE (1) BE798844A (enrdf_load_stackoverflow)
CA (1) CA988408A (enrdf_load_stackoverflow)
DE (1) DE2309970A1 (enrdf_load_stackoverflow)
ES (1) ES414135A1 (enrdf_load_stackoverflow)
FR (1) FR2182678A1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007960A (en) * 1975-04-30 1977-02-15 Gaffney Edward J Reclining elevator chair
US4946222A (en) * 1989-01-30 1990-08-07 Triangle Engineering Of Arkansas, Inc. Lift platform for chairs
US5165753A (en) * 1991-01-02 1992-11-24 Henderson Eldred D Elevator chair apparatus
US6540250B1 (en) 2000-05-12 2003-04-01 Clifford D. Peterson Height adjustable wheelchair
US20060164612A1 (en) * 2005-01-25 2006-07-27 Benq Corporation Electronic device having adjusting assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1133309B (it) * 1980-05-23 1986-07-09 Cir Coop Ind Romagnol Poltrona odontoiatrica operatria
JPS5845837Y2 (ja) * 1980-07-26 1983-10-18 白柳式撰果機株式会社 選果装置における水切用ブラシロ−ラの水切装置
JPS5932987A (ja) * 1982-08-16 1984-02-22 株式会社イデヤ 洗浄乾燥装置
JPS6128375A (ja) * 1984-07-17 1986-02-08 Nogyo Kikaika Kenkyusho 根菜類洗浄装置
US4842233A (en) * 1987-11-12 1989-06-27 Dexta Corporation Lifting mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US155366A (en) * 1874-09-29 Improvement in reclining-chairs
US579499A (en) * 1897-03-23 shapira
US1282164A (en) * 1916-12-04 1918-10-22 Frank W Adsit Opera-chair.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US155366A (en) * 1874-09-29 Improvement in reclining-chairs
US579499A (en) * 1897-03-23 shapira
US1282164A (en) * 1916-12-04 1918-10-22 Frank W Adsit Opera-chair.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007960A (en) * 1975-04-30 1977-02-15 Gaffney Edward J Reclining elevator chair
US4946222A (en) * 1989-01-30 1990-08-07 Triangle Engineering Of Arkansas, Inc. Lift platform for chairs
US5165753A (en) * 1991-01-02 1992-11-24 Henderson Eldred D Elevator chair apparatus
US6540250B1 (en) 2000-05-12 2003-04-01 Clifford D. Peterson Height adjustable wheelchair
US20060164612A1 (en) * 2005-01-25 2006-07-27 Benq Corporation Electronic device having adjusting assembly

Also Published As

Publication number Publication date
DE2309970A1 (de) 1973-11-08
FR2182678A1 (enrdf_load_stackoverflow) 1973-12-14
JPS4942460A (enrdf_load_stackoverflow) 1974-04-22
BE798844A (fr) 1973-10-29
CA988408A (fr) 1976-05-04
ES414135A1 (es) 1976-02-01

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