WO1995020895A2 - Bürostuhl - Google Patents
Bürostuhl Download PDFInfo
- Publication number
- WO1995020895A2 WO1995020895A2 PCT/EP1994/003987 EP9403987W WO9520895A2 WO 1995020895 A2 WO1995020895 A2 WO 1995020895A2 EP 9403987 W EP9403987 W EP 9403987W WO 9520895 A2 WO9520895 A2 WO 9520895A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seat
- spring
- office chair
- chair according
- handlebar
- Prior art date
Links
Classifications
-
- 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
- A47C3/02—Rocking chairs
- A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
- A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
- A47C31/12—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons
- A47C31/126—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons for chairs
-
- 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
- A47C7/441—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with adjustable elasticity
-
- 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
- A47C7/443—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with coil springs
Definitions
- the invention relates to an office chair according to the preamble of claim 1.
- Such office chairs have a device for adjusting the hardness of the backrest suspension to the needs of the user. If different people use such a chair, they have to operate the adjustment device. This is tedious when the seat is changed frequently, and the adjustment / actuating part is often difficult to access.
- the present invention is therefore intended to develop an office chair in accordance with the preamble of the claim in such a way that the hardness of the backrest suspension is automatically adjusted to the user.
- the backrest suspension is automatically set as a function of the weight of the user, since the pretension under which the spring arrangement resetting the backrest is predetermined by the vertical deflection of the seat is therefore proportional to the weight of the user.
- This automatically provides a basic adjustment of the hardness of the backrest suspension for light and heavy people, and a manual setting option for the hardness of the backrest suspension can also be completely omitted if necessary. This is again advantageous in view of the low manufacturing costs and the low height of the seat.
- the development of the invention according to claim 3 is advantageous in terms of low risk of accidents and safe power transmission between the handlebar and the end of the spring arrangement.
- the pivot bearing for the handlebar carrying the backrest according to claim 5 one has a particularly compact arrangement. Furthermore, the backrest moves substantially tangentially to the rear seat end when it is deflected, and there is thus also a favorable distribution between the backrest restoring force and the vertical seat restoring force.
- a position of the handlebar pivot axis as specified in claim 6, has proven to be particularly advantageous. grasslands.
- the seat surface can also directly deform under vertical loads, which is also advantageous in terms of dynamic sitting.
- the spring action for the deformation of the seat surface can be particularly accentuated.
- a customary height adjustment of the seat is combined with a weight-dependent suspension of the backrest.
- the basic spring preload can be adjusted both for the suspension of the seat and for the suspension of the backrest.
- the development of the invention according to claim 15 allows the use of long and thus large-stroke gas springs.
- the helical spring connected in series with the gas spring is covered to the outside.
- the power transmission from the arm bearing the armrest part to the coil spring connected in series with the gas spring can be carried out simply and robustly.
- Figure 1 a side view of an office chair with weight-dependent backrest suspension
- FIG. 2 an axial section through the connection point between a handlebar carrying the backrest and the seat of the office chair shown in FIG. 1 on an enlarged scale;
- FIG. 3 a plan view of a seat base plate and a handlebar of the office chair according to FIG. 1 supporting the backrest on an enlarged scale;
- Figure 4 a schematic diagram of a modified Backrest storage
- FIG. 5 a basic circuit diagram of a modified backrest support
- Figure 6 is a schematic representation of a modified seat part for the office chair of Figure 1;
- FIG. 7 shows an axial section through that area of a further modified office chair, in which the seat height adjustment and the articulation of the handlebar carrying the backrest are provided.
- the office chair shown in FIG. 1 has a foot part, designated overall by 10, which carries a seat base 14 via a height adjustment direction, designated overall by 12.
- the latter carries a backrest base part 18 via a pivotable handlebar 16.
- An upholstered seat 20 is attached to the seat base part 14 and a padded backrest 22 is attached to the backrest base part 18.
- the seat base part 14 is a bent sheet metal part with a base plate 24, which has side plate portions 26, 28 that are bent downwards.
- a reinforcement plate 30 is welded onto the upper side of the base plate 24, and the upper end of one is in aligned through openings of the base plate 24 and the reinforcement plate 30
- the guide rod 32 runs in axial sliding play and rotatably in a hollow threaded spindle 34, which in turn can be screwed into a threaded sleeve 36 which is inserted into the upper end of a vertical bore 38 of the foot part 10.
- the lower end of the threaded spindle 34 carries a stop plate 40 which engages over the lower end of the threaded spindle 34.
- the link 16 is connected in a rotationally fixed manner to a shaft 42, which is mounted in the lateral, depending plate sections 26, 28.
- the axis of the shaft 42 is a horizontal distance from the front edge of the seat 20 by a distance that is substantially twice the horizontal distance between the shaft 42 and the axis of the guide rod 32.
- a cup-shaped indentation 46 is provided in the handlebar 22, in the bottom wall 48 of which an elongated hole 50 is formed which forms the
- Guide rod 32 penetrated with little play in the width direction (direction perpendicular to the drawing plane of Figure 2) and longitudinal mobility in the depth direction (horizontal direction of Figure 2).
- a spring seat ring 52 slidably engages on the underside of the bottom wall 48.
- the spring seat ring 52 is also axially displaceably mounted on the outside of the guide rod 32.
- the upper end of a helical spring 54 engages on its underside, which surrounds the guide rod 32 at a distance.
- the lower end of the coil spring 54 is supported on an axial bearing 56, which is shown as a ball bearing.
- the thrust bearing 56 in turn rests on the upper end face of the threaded spindle 34.
- the seat surface part 60 has an upwardly convexly curved plate section 62, which lies in the front region of the seat 20, and a rear, concavely curved plate section 64 , which is located in the rear area of the seat 20.
- the seat portion 60 is surrounded by foam material 66, as is commonly used for compliant seats, e.g. B. hard polyether foam material.
- laterally edged plate sections 68, 70 of the link 22 have an oblique stop edge 72 in their upper section located to the left of the shaft 22 in FIG. 2, which, together with the underside of the base plate 24, has the lowest and most inclined position specify the backrest 22.
- a transverse handlebar section 74 located at the free end of the handlebar 16 cooperates with a locking body 76 which is carried by a locking lever 78 (compare in particular FIGS. 2 and 3).
- the locking lever 78 is pivotally mounted on the seat base 14 via a vertical axis 80 and, in the sliding play, passes through longitudinal slots 82 which are provided in the plate sections 68, 70.
- the locking body 76 lies outside the path of the handlebar section 74, so that the handlebar 22 can be moved out of the rest position shown by solid lines in FIG. 2 when the user of the office chair leans against the backrest .
- the corresponding pivoting movement of the link 16 is counteracted by a restoring force which is provided by the coil spring 54.
- This force depends on the preload of the helical spring 54 currently encountered, that is, on the weight of the respective on the Office chair seated user, which is completely transmitted to the foot part via the coil spring 54.
- the size of the backrest restoring force can be adjusted in the construction of the office chair (given the stiffness of the coil spring 54, which is selected with regard to the desired vertical suspension of the seat 20) via the position of the shaft 42.
- FIG. 1 the position of the office chair when the back is unloaded is shown by solid lines, and the position taken up when the back is fully loaded is shown by broken lines at 20 '. It can be seen that with the given choice of the position of the shaft 42, the backrest 22 is moved essentially in the tangential direction with respect to the rear end of the seat 20. Even when the backrest is in the vertical position, there is a gap in the office chair described above between the lower end of the backrest and the adjacent end of the seat, in which items of clothing could become jammed.
- FIG. 1 it is also shown at 20 ′′ that the seat 20 can also tilt counterclockwise beyond the horizontal orientation, so that an inclination of up to 10 degrees in inclination of the seat surface is obtained.
- the seat part 60 in its end section adjacent to the backrest when its deepest point has already come into contact with the top of the base plate 24, can spring further down when the user leans back further .
- This additional lowering of the rear part of the seat, shown at 60 '" takes place by elastic deformation of the laminated wood from which the seat part 60 is made. This is inherent in the seat part 60
- the spring effect can be varied by profiling the plywood.
- the convexly curved plate section 62 of the seat part 60 ensures that the user even when the seat 20 is relatively smooth, e.g. B. leather covers, not even on the seat 20 slides forward when he leans back strongly against the back 22.
- the height adjustment device 12 of the office chair described above works as follows:
- the stop plate 40 When the seat 20 is unloaded, the stop plate 40 bears against the lower end face of the threaded spindle 34, and in this way the seat 20 is connected in a rotationally locking manner to the threaded spindle 34, so that rotating the seat leads to a height adjustment thereof.
- the stop plate 40 when the seat is loaded, the stop plate 40 is lifted downward from the lower end face of the threaded spindle 34, so that the torque transmission from the seat 20 to the threaded spindle 34 is interrupted.
- the threaded spindle 34 is now braked by the weight of the user on the threaded sleeve 36 by friction. There is therefore no need for an additional actuation mechanism for the height adjustment of the seat. The latter can still be done easily and within a wide range when the seat is unloaded.
- the coil spring 54 consists of two coil springs 54a and 54b lying axially one behind the other, between which the spring seat ring 52 is now located.
- the handlebar crank is now chosen to run downwards.
- the pivot point of the backrest 22 is at the rear seat end.
- the wall 48 is then provided in accordance with the exemplary embodiment in FIG. 5 on a free section of the link 16, which extends from the shaft 42 adjacent to the rear seat end to the lower end of the coil spring 54.
- leaf spring sections 84 running laterally downward to the upper side of the base plate 24 can be separated from the back-side end section of the seat part 60 in order to achieve the spring action in the last part of the downward movement of the rear section of the seat part 60 to reinforce.
- the seat base 14 and the handlebar 16 are now cast aluminum.
- a stand sleeve 88 is inserted, which is closed at the bottom by an end plate 90.
- a piston rod 92 of a gas spring, designated overall by 94, is supported on the latter.
- the end of the piston rod is surrounded by a rubber end-position damper ring 96.
- an end part 98 is inserted, which surrounds the housing of the gas spring 94 marked with 100 in sliding play.
- a lower spring seat ring 102 which can be screwed onto the housing 100, is provided above the end part 98.
- the lower end of the coil spring 54 engages this via the axial bearing 56.
- This is surrounded by a sleeve 104 with play, which is molded onto the base plate 24 of the seat base part 14.
- the sleeve 104 has two diametrically opposed, upwardly open slots 106, through each of which a pin 108 is passed so that it can be tilted in a circular recess 110 in the top of the upper spring seat ring 52 and is somewhat displaceable in the horizontal direction Takes place.
- a Bowden cable for actuating the head valve of the gas spring 94 is indicated at 112. At 108 'and 16' they are
- the arrangement shown in FIG. 7 has a mechanical series connection of a coil spring and a gas pressure spring.
- the gas pressure spring can be used in the usual way for height adjustment of the seat 20. Both springs serve equally for the vertical cushioning of the seat 20.
- the backrest suspension depends on the weight of the user, since the link 16 can only be pivoted against the helical spring 54, which is preloaded according to the weight of the user.
- a locking ring 114 is screwed into the upper end of the sleeve 104 and, like the upper spring seat ring 52, defines a through-opening through which the housing 100 of the gas spring 94 is guided in sliding play.
- a guide ring 116 made of slide bearing material can be provided on the uppermost section of the housing 100.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7510122A JPH09506006A (ja) | 1993-12-02 | 1994-12-01 | 事務椅子 |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4341071.5 | 1993-12-02 | ||
DE4341071A DE4341071A1 (de) | 1993-12-02 | 1993-12-02 | Bürostuhl |
PCT/EP1995/001199 WO1996029912A1 (de) | 1993-12-02 | 1995-03-31 | Bürostuhl |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1995020895A2 true WO1995020895A2 (de) | 1995-08-10 |
WO1995020895A3 WO1995020895A3 (de) | 1995-11-02 |
Family
ID=45952683
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/003987 WO1995020895A2 (de) | 1993-12-02 | 1994-12-01 | Bürostuhl |
PCT/EP1995/001199 WO1996029912A1 (de) | 1993-12-02 | 1995-03-31 | Bürostuhl |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/001199 WO1996029912A1 (de) | 1993-12-02 | 1995-03-31 | Bürostuhl |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPH09506006A (de) |
DE (1) | DE4341071A1 (de) |
WO (2) | WO1995020895A2 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4341071A1 (de) * | 1993-12-02 | 1995-06-08 | Hansen Fritz As | Bürostuhl |
DE102004053965B4 (de) * | 2004-11-09 | 2006-10-12 | Girsberger Holding Ag | Stuhl |
DE202007006762U1 (de) | 2006-10-13 | 2008-02-14 | Bock 1 Gmbh & Co. Kg | Mechanik für einen Bürostuhl |
DE202008011703U1 (de) | 2008-02-22 | 2009-07-02 | Bock 1 Gmbh & Co. Kg | Mechanik für einen Bürostuhl |
US10966527B2 (en) | 2017-06-09 | 2021-04-06 | Steelcase Inc. | Seating arrangement and method of construction |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3053571A (en) * | 1961-02-20 | 1962-09-11 | Seng Co | Chair iron |
US3455601A (en) * | 1966-11-02 | 1969-07-15 | Finn Lie | Support unit for chair |
WO1991001663A1 (en) * | 1989-08-04 | 1991-02-21 | Kairos S.R.L. | Support device for the seat of armchairs or the like with automatically controlled inclination |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4341071A1 (de) * | 1993-12-02 | 1995-06-08 | Hansen Fritz As | Bürostuhl |
-
1993
- 1993-12-02 DE DE4341071A patent/DE4341071A1/de not_active Withdrawn
-
1994
- 1994-12-01 JP JP7510122A patent/JPH09506006A/ja active Pending
- 1994-12-01 WO PCT/EP1994/003987 patent/WO1995020895A2/de active Application Filing
-
1995
- 1995-03-31 WO PCT/EP1995/001199 patent/WO1996029912A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3053571A (en) * | 1961-02-20 | 1962-09-11 | Seng Co | Chair iron |
US3455601A (en) * | 1966-11-02 | 1969-07-15 | Finn Lie | Support unit for chair |
WO1991001663A1 (en) * | 1989-08-04 | 1991-02-21 | Kairos S.R.L. | Support device for the seat of armchairs or the like with automatically controlled inclination |
Also Published As
Publication number | Publication date |
---|---|
WO1996029912A1 (de) | 1996-10-03 |
JPH09506006A (ja) | 1997-06-17 |
DE4341071A1 (de) | 1995-06-08 |
WO1995020895A3 (de) | 1995-11-02 |
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