CA2149898A1 - Chair, especially office chair - Google Patents
Chair, especially office chairInfo
- Publication number
- CA2149898A1 CA2149898A1 CA002149898A CA2149898A CA2149898A1 CA 2149898 A1 CA2149898 A1 CA 2149898A1 CA 002149898 A CA002149898 A CA 002149898A CA 2149898 A CA2149898 A CA 2149898A CA 2149898 A1 CA2149898 A1 CA 2149898A1
- Authority
- CA
- Canada
- Prior art keywords
- chair
- seat
- axis
- backrest
- curved
- 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.)
- Abandoned
Links
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
- A47C1/022—Reclining or easy chairs having independently-adjustable supporting 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
- A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
- A47C7/446—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with fluid springs
Abstract
The present invention relates to a chair, in particular an office chair, with a seat (1) that can pivot about a horizontal axis (K) as well as a backrest (2) that can pivot about a horizontal second axis (H). In addition, the chair has a seat support (5) that holds the seat. The first axis (K) extends at least approximately through the ankle joint of the user. The second axis (H) passes at least approximately through the hip joint of the user. This results in optimal movement proportions that cannot be obtained with the chairs known up to the present time.
Description
~' 2~9~398 A CHAIR, IN PARTICULAR AN OFFICE CHAIR
TECHNICAL DOMAIN
The present invention relates to a chair, in particular an office chair, as described in the preamble to patent Claim 1.
PRIOR ART
Various designs for chairs of this kind have been known for some time. However, the known chairs of this kind do not take into account the ergonomic demands that have to be satisfied in order to provide dynamic seating. The chair must permit a series of movements that correspond as closely as possible to the natural body movements of the user. When this is done, the chair must maintain its supporting function whilst providing the greatest possible freedom of movement on the part of the user.
The user's movements are determined, in the first instance, by the shape and arrangement of the joints, which determine the direction and angle of rotation of the movement, as well as by the pivoting radius that results from the length of the limbs that are moved about a joint in the body.
Thus, centres of rotation that permit pivoting movements through different angles exist on or in the human body. In order to achieve a symbiosis of the movements of the user and of the chair, the pivoting movements and the points of rotation of the user must agree to the greatest extent possible with those of the chair mechanism.
In the designs that have been known up to now, the centres of rotation have been integrated into the framework of the chair in , , ' ' . ' ' ,: ~ . ,'' ' .
: . ' , . ., . ~ ' .
- , .:
,, .
,
TECHNICAL DOMAIN
The present invention relates to a chair, in particular an office chair, as described in the preamble to patent Claim 1.
PRIOR ART
Various designs for chairs of this kind have been known for some time. However, the known chairs of this kind do not take into account the ergonomic demands that have to be satisfied in order to provide dynamic seating. The chair must permit a series of movements that correspond as closely as possible to the natural body movements of the user. When this is done, the chair must maintain its supporting function whilst providing the greatest possible freedom of movement on the part of the user.
The user's movements are determined, in the first instance, by the shape and arrangement of the joints, which determine the direction and angle of rotation of the movement, as well as by the pivoting radius that results from the length of the limbs that are moved about a joint in the body.
Thus, centres of rotation that permit pivoting movements through different angles exist on or in the human body. In order to achieve a symbiosis of the movements of the user and of the chair, the pivoting movements and the points of rotation of the user must agree to the greatest extent possible with those of the chair mechanism.
In the designs that have been known up to now, the centres of rotation have been integrated into the framework of the chair in , , ' ' . ' ' ,: ~ . ,'' ' .
: . ' , . ., . ~ ' .
- , .:
,, .
,
2 ~
the form of materiel axes. However, the central problem lies in the fact that in order to achieve optimal movement sequences, the important centres of rotation have to be located outside the framework of the chair. For this reason, the anatomically correct centre of rotation cannot be achieved by designs that integrate the axes into the framework of the chair. For this reason, in thè case of known chairs, the sequences of movements that can be carried out can only approximate human movements to an inadequate degree.
In principle, it i5 possible to dispense with designs that involve axes if one considers the fact that in chairs of this type a range of angles of pivot of at most 25 is sufficient.
This makes it possible to use a pivoting mechanism that permits pivoting that is effected about a virtual axis located outside the structure of the chair. This virtual axis coincides with the important moving joints of the human body.
For the movement of the seating surface, what i.5 relevant is that for movement of the body in a relaxed position, the ankle becomes a centre of rotation. The lower leg pivots about this centre of rotation or pivot point at the same angle as the seating surface tilts to the rear. Because of this tilting, the distance between the floor and the lower leg is reduced. If it is intended that the chair moves freely and completely in compliance with this movement, the following demand will be imposed on the movement of the seating surface: if the seat is loaded in the rear area, then the seating surface must move downward and backward about the ankle joint. Thus, the reference system for the movement of the seating surface lies in the ankle joint and not--as is usually the case--in the front underneath area of the seating surface.
By displacing the axis of pivot of the chair into the area of the ankle, in keeping with this demand, it is ensured that the feet remain in contact with the floor in all pivoted positions and that during the pivoting process, no different and additional : : --: :: : :: :- .- - , . : ~ , .. . , . .. : .
,, -. - - , . , . - . -:
~ r ' - : . ' . - ' .:: ~ , - ': . . , ' .: , - : ~ ,, : . . ~: ,: - , .: , : -., , . , . ~ , ~ : -- ,: , . - , ~ . , : ` : ;: :; ` . :
2 ~ $
:
pressure is applied to the underneath area of the thigh by the front edge of the seat.
The following considerations are relevant with respect to an anatomically correct configuration of the change in the position of the backrest:
If the user is in an upright attitude on a seat and maintains the position between the third and fourth lumbar vertebrae, and if the user inclines his back by an additional 20 to 30 to the rear and one can see that the two lumbar vertebrae pivot downwards around the hip joint. This means that the contour of the back grows increasingly shorter as the angle of pivot of this backward inclination grows larger. This means that the following will apply for developing a chair that is as ergonomically perfect as possible: if one wishes to synchronize the movements of the back and the backrest, then the backrest must pivot about the axis of the hips and thus grow shorter, as it were. In contrast to this, in conventional designs the lumbar support provided by the baskrest moves upwards and thus loses its supporting function.
In addition, when this happens, the "shirt-tail pull out" effect is seen.
Taking this information into consideration, the point of rotation for the structural configuration of the backrest is to be established in the hip joint. Consequently, this means decoupling the movements of the seating surface and the backrest.
The sequences of movement that are initially independent of each other are accordingly related to each other in a natural manner since the chair and the body move synchronously. No other control need be imposed since control of the movement of the chair is effected exclusively by body movement, and specifically by the shift in weight.
.- " .
. , . . - . .
.~- , ~ -. . .
, 2 ~
THE INVENTION
Proceeding from the prior art discussed above, it is the task of the present invention to create a chair that permits dynamic seating whilst observing the important ergonomic considerations to the greatest extent possible.
This problem has been solved with the distinguishing features set out in the descriptive section of Claim 1.
Preferred and additional configurations of the present invention are set out in the secondary claims.
The chair according to the present invention corresponds completely, or at least almost completely, to the ergonomic necessities that result from the conditions described above. The desired and ergonomically favourable movement sequences can be converted at comparatively little outlay into the design configuration of chairs.
BRIEF DESCRIPTION OF THE ILLUSTRATIONS
Preferred embodiments of the present invention are des~ribed in greater detail below on the basis of the drawings appended hereto. These drawings show the following: ~ -igure 1: a diagrammatic illustration of the body attitude in two different user situations;
Figure 2: a diagrammatic and perspective illustration of a seat and backrest frame with a lower frame shown in part, in an embodiment without arm rests;
Figure 3: an illustration analogous to Figure 2, of an embodiment with arm rests;
Figure 4: a side view of the complete chair as in Figure 2 in an unloaded starting position;
.. , . ' ! , ~ ........ .
' ,, ~,.' ' " ' ' . ' ' . ' , ' " ' " ', ',' . '' ' " ' ' ' ' ,' ' ' ' '".' ' ''. " ' ' '' ~'' ~ ' ' ' ' ' ',',,'.. ' . "' '' ' i ' ' ' '~.' .' ''. .' ' ' ' ' ' ' " ' ' ~'' ' ' ' ' " ' ~
2 ~
igure 5: the chair as in Figure 4, with the backrest pivoted back;
Figure 6: the chair as in Figure ~, with the seat pivoted downward;
Figure 7: the chair as in Figure 4, with the seat pivoted downward and the backrest pivoted back;
Figure 8: a side view of the complete chair as in Figure 3, with the arm rests in position ready for use;
Figure 9: an illustration as in Figure 8, with the arm rests pivoted upward and backward.
THE BEST MODE TO IMPLEMENT THE INVENTION
Figure 1 shows two different user attitudes. In the initial position, in which the lower leg is essentially perpendicular to the floor, the user is shown with an upright spinal column as indicated by the black shape. The continuous lines showing the chair with its arm rests, which is only indicated in the drawings, correspond to this position; in a second position, which is tilted back, only the outline of the user is shown, and the outlines of the chair are indicated by dashed lines.
The important joint for the arcs that are followed by the movement of the seat is the ankle joint, which is indicated here as K. This joint through the ankle is simultaneously the first axis of the chair. The position of the knee joint when the user is in an upright position i5 indicated by G and the hip joint in the upright position is indicated by H. The hip joint simultaneously represents the second axis of the chair, about which the lower area of the backrest of the chair is tilted back when inclined.
It is clear from Figure 1 that the position of the first axis K
is always unchanged, whereas the knee joint G moves into the position G' and the hip joint H moves into the position H'.
: ' - ~ ' ~: :: -: . , , . - , . :
.. . .
. '.
:: , , 2 ~ ~31~ 3 ~!
Figure 2 shows the basic construction of a chair without arm rests. The perspective drawing shown in Figure 2 shows the complete chair although this does not show the seat and backrest upholstery or the cruciform base that continues in the stand pipe
the form of materiel axes. However, the central problem lies in the fact that in order to achieve optimal movement sequences, the important centres of rotation have to be located outside the framework of the chair. For this reason, the anatomically correct centre of rotation cannot be achieved by designs that integrate the axes into the framework of the chair. For this reason, in thè case of known chairs, the sequences of movements that can be carried out can only approximate human movements to an inadequate degree.
In principle, it i5 possible to dispense with designs that involve axes if one considers the fact that in chairs of this type a range of angles of pivot of at most 25 is sufficient.
This makes it possible to use a pivoting mechanism that permits pivoting that is effected about a virtual axis located outside the structure of the chair. This virtual axis coincides with the important moving joints of the human body.
For the movement of the seating surface, what i.5 relevant is that for movement of the body in a relaxed position, the ankle becomes a centre of rotation. The lower leg pivots about this centre of rotation or pivot point at the same angle as the seating surface tilts to the rear. Because of this tilting, the distance between the floor and the lower leg is reduced. If it is intended that the chair moves freely and completely in compliance with this movement, the following demand will be imposed on the movement of the seating surface: if the seat is loaded in the rear area, then the seating surface must move downward and backward about the ankle joint. Thus, the reference system for the movement of the seating surface lies in the ankle joint and not--as is usually the case--in the front underneath area of the seating surface.
By displacing the axis of pivot of the chair into the area of the ankle, in keeping with this demand, it is ensured that the feet remain in contact with the floor in all pivoted positions and that during the pivoting process, no different and additional : : --: :: : :: :- .- - , . : ~ , .. . , . .. : .
,, -. - - , . , . - . -:
~ r ' - : . ' . - ' .:: ~ , - ': . . , ' .: , - : ~ ,, : . . ~: ,: - , .: , : -., , . , . ~ , ~ : -- ,: , . - , ~ . , : ` : ;: :; ` . :
2 ~ $
:
pressure is applied to the underneath area of the thigh by the front edge of the seat.
The following considerations are relevant with respect to an anatomically correct configuration of the change in the position of the backrest:
If the user is in an upright attitude on a seat and maintains the position between the third and fourth lumbar vertebrae, and if the user inclines his back by an additional 20 to 30 to the rear and one can see that the two lumbar vertebrae pivot downwards around the hip joint. This means that the contour of the back grows increasingly shorter as the angle of pivot of this backward inclination grows larger. This means that the following will apply for developing a chair that is as ergonomically perfect as possible: if one wishes to synchronize the movements of the back and the backrest, then the backrest must pivot about the axis of the hips and thus grow shorter, as it were. In contrast to this, in conventional designs the lumbar support provided by the baskrest moves upwards and thus loses its supporting function.
In addition, when this happens, the "shirt-tail pull out" effect is seen.
Taking this information into consideration, the point of rotation for the structural configuration of the backrest is to be established in the hip joint. Consequently, this means decoupling the movements of the seating surface and the backrest.
The sequences of movement that are initially independent of each other are accordingly related to each other in a natural manner since the chair and the body move synchronously. No other control need be imposed since control of the movement of the chair is effected exclusively by body movement, and specifically by the shift in weight.
.- " .
. , . . - . .
.~- , ~ -. . .
, 2 ~
THE INVENTION
Proceeding from the prior art discussed above, it is the task of the present invention to create a chair that permits dynamic seating whilst observing the important ergonomic considerations to the greatest extent possible.
This problem has been solved with the distinguishing features set out in the descriptive section of Claim 1.
Preferred and additional configurations of the present invention are set out in the secondary claims.
The chair according to the present invention corresponds completely, or at least almost completely, to the ergonomic necessities that result from the conditions described above. The desired and ergonomically favourable movement sequences can be converted at comparatively little outlay into the design configuration of chairs.
BRIEF DESCRIPTION OF THE ILLUSTRATIONS
Preferred embodiments of the present invention are des~ribed in greater detail below on the basis of the drawings appended hereto. These drawings show the following: ~ -igure 1: a diagrammatic illustration of the body attitude in two different user situations;
Figure 2: a diagrammatic and perspective illustration of a seat and backrest frame with a lower frame shown in part, in an embodiment without arm rests;
Figure 3: an illustration analogous to Figure 2, of an embodiment with arm rests;
Figure 4: a side view of the complete chair as in Figure 2 in an unloaded starting position;
.. , . ' ! , ~ ........ .
' ,, ~,.' ' " ' ' . ' ' . ' , ' " ' " ', ',' . '' ' " ' ' ' ' ,' ' ' ' '".' ' ''. " ' ' '' ~'' ~ ' ' ' ' ' ',',,'.. ' . "' '' ' i ' ' ' '~.' .' ''. .' ' ' ' ' ' ' " ' ' ~'' ' ' ' ' " ' ~
2 ~
igure 5: the chair as in Figure 4, with the backrest pivoted back;
Figure 6: the chair as in Figure ~, with the seat pivoted downward;
Figure 7: the chair as in Figure 4, with the seat pivoted downward and the backrest pivoted back;
Figure 8: a side view of the complete chair as in Figure 3, with the arm rests in position ready for use;
Figure 9: an illustration as in Figure 8, with the arm rests pivoted upward and backward.
THE BEST MODE TO IMPLEMENT THE INVENTION
Figure 1 shows two different user attitudes. In the initial position, in which the lower leg is essentially perpendicular to the floor, the user is shown with an upright spinal column as indicated by the black shape. The continuous lines showing the chair with its arm rests, which is only indicated in the drawings, correspond to this position; in a second position, which is tilted back, only the outline of the user is shown, and the outlines of the chair are indicated by dashed lines.
The important joint for the arcs that are followed by the movement of the seat is the ankle joint, which is indicated here as K. This joint through the ankle is simultaneously the first axis of the chair. The position of the knee joint when the user is in an upright position i5 indicated by G and the hip joint in the upright position is indicated by H. The hip joint simultaneously represents the second axis of the chair, about which the lower area of the backrest of the chair is tilted back when inclined.
It is clear from Figure 1 that the position of the first axis K
is always unchanged, whereas the knee joint G moves into the position G' and the hip joint H moves into the position H'.
: ' - ~ ' ~: :: -: . , , . - , . :
.. . .
. '.
:: , , 2 ~ ~31~ 3 ~!
Figure 2 shows the basic construction of a chair without arm rests. The perspective drawing shown in Figure 2 shows the complete chair although this does not show the seat and backrest upholstery or the cruciform base that continues in the stand pipe
3. A seat carrier 6 is attached to the stand pipe 3. The seat support 5 fits into the seat carrier receptacle 6. The seat carrier 5 is secured centrally to the seat frame la. The backrest frame 2a can be pivoted relative to the seat frame la.
The construction of the chair shown in Figure 3 is similar.
However, what differs here is the connection between the backrest frame 2a and the seat frame la. In Figure 3, the curved areas lla of the arm rests 11 are slid into the rear ends lc of the seat frame la that are curved upward. The double arrow 12 indicates the pivoting mobility of the arm rests 11. ;
Parts that are identical or correspond to each other all bear -identical reference numbers in the different drawings.
In the embodiments that are shown in Figures 4 to 7, the overall seat is numbered 1, and this consists of the seat frame la and seat upholstery lb. The seat frame la consists of rectangular tubes, although other materials having other cross-sections can also be used. The two rectangular side tubes of the seat frame la are curved upwards in their rear area through a radius r2.
The radius r2 corresponds to the distance between the second axis H, which coincides with the hip joint, and the midline 14 of the curved area lc. A similarly curved or bent area 2c of the backrest, which bears the overall number 2, fits into the curved area lc. The backrest 2 consists essentially of a backrest frame 2a and backrest upholstery 2b. The midline 14 of the curved area lc of the seat and of the curved area 2c of the backrest frame 2a coincide. The areas lc and 2c that are curved at an equal radius r2 are connected to each other, so as to be able to slide, .,.. - : . : . . : - , ~
through curved bearings, for example, curved longitudinal ball bearings.
The height of the stand pipe 3 can be adjusted relative to the cruciform base 4 that is provided with casters. The seat carrier receptacle 6 is installed on ~he stand pipe 3 and the seat support 5 fits into this. The seat support 5 and the seat support receptacle 6 have a joint common line 13 that is curved at radius r1 about the first axis K, which passes through the ankle of the user. The curved seat support 5 is guided so as to be able to slide in the curved seat support receptacle 6 with the help of longitudinal ball bearings that are only indicated diagrammatically herein. All other types of slide guides can be used, particularly plastic guides.
Between the seat support 5 and the seat support receptacle 6 there is a spring element 9 and this grows shorter when under load. This spring element is an energy accumulator that can be in the form of a conventional compressed gas spring. Between the backrest frame 2a and the curved area lc of the seat frame there is a corresponding spring element 10 that grows shorter when the backrest is tilted to the rear, as can be seen, for example, by comparing Figure 4 with Figure 5.
In the embodiment that is shown in Figures 8 and 9, which corresponds to the diagrammatic representation shown in Figure 3, the fundamental construction of the stool remains the same.
However, the version shown in Figures 8 and 9 has an arm rest 11 that consists of a surface llb and an arm rest lower tube llc.
The arm rest lower tube is curved in its rear area, this being done at the same radius as the rear curved piece lc of the seat frame. Figure 8 shows the arm rest ready for use. Figure 9 shows the arm rest tilted upward in which the tube llc forms an extension of the contour of the backrest frame 2a.
The construction of the chair shown in Figure 3 is similar.
However, what differs here is the connection between the backrest frame 2a and the seat frame la. In Figure 3, the curved areas lla of the arm rests 11 are slid into the rear ends lc of the seat frame la that are curved upward. The double arrow 12 indicates the pivoting mobility of the arm rests 11. ;
Parts that are identical or correspond to each other all bear -identical reference numbers in the different drawings.
In the embodiments that are shown in Figures 4 to 7, the overall seat is numbered 1, and this consists of the seat frame la and seat upholstery lb. The seat frame la consists of rectangular tubes, although other materials having other cross-sections can also be used. The two rectangular side tubes of the seat frame la are curved upwards in their rear area through a radius r2.
The radius r2 corresponds to the distance between the second axis H, which coincides with the hip joint, and the midline 14 of the curved area lc. A similarly curved or bent area 2c of the backrest, which bears the overall number 2, fits into the curved area lc. The backrest 2 consists essentially of a backrest frame 2a and backrest upholstery 2b. The midline 14 of the curved area lc of the seat and of the curved area 2c of the backrest frame 2a coincide. The areas lc and 2c that are curved at an equal radius r2 are connected to each other, so as to be able to slide, .,.. - : . : . . : - , ~
through curved bearings, for example, curved longitudinal ball bearings.
The height of the stand pipe 3 can be adjusted relative to the cruciform base 4 that is provided with casters. The seat carrier receptacle 6 is installed on ~he stand pipe 3 and the seat support 5 fits into this. The seat support 5 and the seat support receptacle 6 have a joint common line 13 that is curved at radius r1 about the first axis K, which passes through the ankle of the user. The curved seat support 5 is guided so as to be able to slide in the curved seat support receptacle 6 with the help of longitudinal ball bearings that are only indicated diagrammatically herein. All other types of slide guides can be used, particularly plastic guides.
Between the seat support 5 and the seat support receptacle 6 there is a spring element 9 and this grows shorter when under load. This spring element is an energy accumulator that can be in the form of a conventional compressed gas spring. Between the backrest frame 2a and the curved area lc of the seat frame there is a corresponding spring element 10 that grows shorter when the backrest is tilted to the rear, as can be seen, for example, by comparing Figure 4 with Figure 5.
In the embodiment that is shown in Figures 8 and 9, which corresponds to the diagrammatic representation shown in Figure 3, the fundamental construction of the stool remains the same.
However, the version shown in Figures 8 and 9 has an arm rest 11 that consists of a surface llb and an arm rest lower tube llc.
The arm rest lower tube is curved in its rear area, this being done at the same radius as the rear curved piece lc of the seat frame. Figure 8 shows the arm rest ready for use. Figure 9 shows the arm rest tilted upward in which the tube llc forms an extension of the contour of the backrest frame 2a.
Claims (8)
1. A chair, in particular an office chair, with a seat (1) that can be pivoted about a horizontal first axis (K) and a backrest (2) that can be pivoted about a horizontal second axis (H), and also with a seat carrier (5) that holds the seat (1), characterized in that the first axis (K) passes at least approximately through the ankle of the user and the second axis (H) passes at least approximately through the user's hip joint.
2. A chair as defined in Claim 1, characterized in that the height of the seat (1) can be adjusted.
3. A chair as defined in Claim 1 and/or Claim 2, characterized in that it has two side arm rests (11) that can be pivoted from the use position upwards into the position in which they are at least approximately flush with the backrest (2).
4. A chair as defined in one or more of the Claims 1 to 3, characterized in that the seat support (5) and the seat support receptacle (6) that is connected with this so as to be able to slide are both curved in the shape of an arc of radius r1 that corresponds at least approximately to the distance between the first axis (K) and the common midline (13) of the seat support (5) and the seat support receptacle (6).
5. A chair as defined in one or more of the Claims 1 to 4, characterized in that the backrest (2) is secured to the seat (1).
6. A chair as defined in one or more of the Claims 1 to 5, characterized in that the arm rest (11) is secured to the seat (1).
7. A chair as defined in one or more of the Claims 1 to 6, characterized in that the seat support (5) is arranged in the centre of the seat frame (1a) and the seat support receptacle (6) is arranged on a central vertical stand pipe (3).
8. A chair as defined in one or more of the Claims 1 to 7, characterized in that the seat back frame (2a) is curved in an arc in its lower area in the same way as a seat frame area (1c) that is connected with this so as to be able to slide, this being done at a radius r2 that corresponds at least approximately to the distance between the second axis (H) and the common midline (14) of the curved seat frame area (1c) and the curved area of the backrest frame (2a).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4331987.4 | 1993-09-21 | ||
| DE4331987A DE4331987A1 (en) | 1993-09-21 | 1993-09-21 | Chair, especially office chair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2149898A1 true CA2149898A1 (en) | 1995-03-30 |
Family
ID=6498162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002149898A Abandoned CA2149898A1 (en) | 1993-09-21 | 1994-08-10 | Chair, especially office chair |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0669816B1 (en) |
| JP (1) | JPH08503644A (en) |
| AT (1) | ATE160682T1 (en) |
| CA (1) | CA2149898A1 (en) |
| DE (2) | DE4331987A1 (en) |
| WO (1) | WO1995008284A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071527A3 (en) * | 2000-03-23 | 2001-12-27 | Cke Technologies Inc | Ergonomic chair |
| US7770973B2 (en) * | 2006-05-22 | 2010-08-10 | Wilkhahn Wilkening + Hahne Gmbh + Co. Kg | Chair |
| US8070230B2 (en) * | 2008-02-27 | 2011-12-06 | Thonet Gmbh | Chair having an inclinable back rest |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29600821U1 (en) * | 1996-01-18 | 1997-05-28 | Grammer Ag | Chair, especially office chair |
| DE19900454C2 (en) * | 1999-01-08 | 2001-10-25 | Andreas Struppler | Chair, especially office chair |
| DE10109624C1 (en) * | 2001-02-28 | 2002-09-12 | Interstuhl Bueromoebel Gmbh | Chair, especially office chair |
| DE10115501C2 (en) * | 2001-03-29 | 2003-03-27 | Struppler Associates Design Gm | Chair, especially office chair |
| SG11202003107PA (en) * | 2017-10-05 | 2020-05-28 | Godrej & Boyce Mfg Co Ltd | Posture adaptive work chair |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2448770C3 (en) * | 1974-10-12 | 1979-03-01 | Daimler-Benz Ag, 7000 Stuttgart | Swivel armrest |
| US4408800A (en) * | 1980-06-11 | 1983-10-11 | American Seating Company | Office chairs |
| NO160896C (en) * | 1986-05-09 | 1989-06-14 | Jurek Buchacz | ADJUSTABLE SEATING DEVICE. |
| DE3616475C1 (en) * | 1986-05-15 | 1987-06-11 | Kusch Co Sitzmoebel | Height-adjustable swivel chair equipped with gas pressure spring, in particular office chair or armchair |
-
1993
- 1993-09-21 DE DE4331987A patent/DE4331987A1/en not_active Withdrawn
-
1994
- 1994-08-10 CA CA002149898A patent/CA2149898A1/en not_active Abandoned
- 1994-08-10 DE DE59404723T patent/DE59404723D1/en not_active Expired - Fee Related
- 1994-08-10 AT AT94925442T patent/ATE160682T1/en active
- 1994-08-10 JP JP7509519A patent/JPH08503644A/en active Pending
- 1994-08-10 EP EP94925442A patent/EP0669816B1/en not_active Expired - Lifetime
- 1994-08-10 WO PCT/EP1994/002642 patent/WO1995008284A1/en active IP Right Grant
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071527A3 (en) * | 2000-03-23 | 2001-12-27 | Cke Technologies Inc | Ergonomic chair |
| US7497515B2 (en) | 2000-03-23 | 2009-03-03 | Jonathan Krehm, legal representative | Ergonomic chair |
| US7770973B2 (en) * | 2006-05-22 | 2010-08-10 | Wilkhahn Wilkening + Hahne Gmbh + Co. Kg | Chair |
| US8070230B2 (en) * | 2008-02-27 | 2011-12-06 | Thonet Gmbh | Chair having an inclinable back rest |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59404723D1 (en) | 1998-01-15 |
| DE4331987A1 (en) | 1995-03-23 |
| ATE160682T1 (en) | 1997-12-15 |
| WO1995008284A1 (en) | 1995-03-30 |
| JPH08503644A (en) | 1996-04-23 |
| EP0669816B1 (en) | 1997-12-03 |
| EP0669816A1 (en) | 1995-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |