GB2030853A - A chair with adjustable foot rest - Google Patents
A chair with adjustable foot rest Download PDFInfo
- Publication number
- GB2030853A GB2030853A GB7837611A GB7837611A GB2030853A GB 2030853 A GB2030853 A GB 2030853A GB 7837611 A GB7837611 A GB 7837611A GB 7837611 A GB7837611 A GB 7837611A GB 2030853 A GB2030853 A GB 2030853A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chair
- foot support
- support
- positioning means
- foot
- 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.)
- Granted
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
- A47C3/20—Chairs or stools with vertically-adjustable seats
- A47C3/28—Chairs or stools with vertically-adjustable seats with clamps acting on vertical rods
-
- 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
- A47C7/50—Supports for the feet or the legs coupled to fixed parts of the chair
- A47C7/506—Supports for the feet or the legs coupled to fixed parts of the chair of adjustable type
- A47C7/5066—Supports for the feet or the legs coupled to fixed parts of the chair of adjustable type by rotation
-
- 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
- A47C7/50—Supports for the feet or the legs coupled to fixed parts of the chair
- A47C7/506—Supports for the feet or the legs coupled to fixed parts of the chair of adjustable type
- A47C7/5062—Supports for the feet or the legs coupled to fixed parts of the chair of adjustable type rectilinearly
- A47C7/5064—Supports for the feet or the legs coupled to fixed parts of the chair of adjustable type rectilinearly in vertical direction
Abstract
A chair, particularly a rotatable or swivel work chair, comprises a base (5), a supporting structure (2), a seat (3) mounted on the supporting structure, a support (6) which connects the supporting structure to the base and which is adjustable in length to raise and lower the seat in use with respect to the base, a telescopically extensible column (8) connected at one end to and depending from the supporting structure and axially slidably supported near its other end on the support, a cross-member (12) connected to the other end of the column and supporting positioning means (13), a foot support (7) connected to the positioning means for pivotable movement relative thereto about an axis which extends parallel to the cross-member for varying the inclination of the foot support and means (16-20, 24) for adjusting the inclination of the foot support and releasably fastening the foot support with respect to the positioning means. <IMAGE>
Description
SPECIFICATION
A chair
This invention relates to a chair, and particularly but not exclusively to a rotatable or swivel work chair, the height of the seat of which is adjustable.
Various known chairs, such as for example chairs for offices, work places on machines and the like, are often in the form of so-called swivel chairs which comprise, in addition to a fixed or movable base, a strut which bears the seat and which is preferably adjustable in height. Investigations, in particular investigations relating to the physiology of working conditions, have indicated that the working performance of a person often depends on his posture when seated, and that it appears advisable, for the purpose of an optimal work performance, to bring the seating position into a functional position to the workplace.In order to achieve this, for example, foot stools or foot supports are used on work machines and the like; the person concerned can rest his feet on these foot stools or foot supports when, after heightwise adjustment of the seat has been made, the legs dangle with insufficient support. Such auxiliary means may be satisfactory in part; however they do not achieve optimal results because, after each heightwise adjustment, the distance of the foot support from the seat portion will vary, so that the foot support may perhaps be ideal in one heightwise position but it will be inadequate in the other heightwise positions.
In order to provide a remedy for this it has previously been suggested to equip a chair of this kind with a foot support, this foot support being so arranged on a support structure of the chair that this support structure follows the heightwise adjustment of the seat and can also be brought, in its inclined position, into the desired position of inclination at a given time.
For bringing the foot support into the position of inclination desired at any given time a positioning device is provided on the support structure, and this positioning device is provided with adjusting members required for the positioning action and also with at least one locking means for locking the foot support in the position of inclination assumed. The foot support, which is a U-shaped tube, is symmetrically connected, by its free arms, to the adjusting member and it is there so fixed that it can follow the alterations in position of the positioning member. With this foot support a good seat position can be obtained as a resu It of adjustment of the foot support. However, it is considered that an improvement can be realised by futher accommodating the foot support to the different requirements as to position of inclination and heightwise positioning.
Accordingly, it is an object of the invention to provide a foot support which allows, in addition to adjustment of its inclination, a wide range of axial movement, so that persons whose legs are of different lengths can achieve a good seating posture by optimal support of the legs, and this foot support can easily be altered in its position of inclination and can be secured in the position of inclination desired at any given time.
According to one aspect of the invention there is provided a chair comprising a base, a supporting structure, a seat mounted on the supporting structure, a support which connects the supporting structure to the base and which is adjustable in length to raise and lower the seat in use with respect to the base, a telescopically extensible column connected at one end to and depending from the supporting structure and axially slidably supported near its other end on the support, a foot support, means connecting the foot support to the lower end of the column for pivotable movement about an axis normal or substantially normal to the axis of the column and releasable fastening means for releasably locating the foot support at a desired inclination, the telescopically extensible column permitting adjustment of the distance between the seat and the foot support.
According to a further aspect of the invention, there is provided a chair comprising a base, a supporting structure, a seat mounted on the supporting structure, a support which connects the supporting structure to the base and which is adjustable in length to raise and lower the seat in use with respect to the base, a telescopically extensible column connected at one end to and depending from the supporting structure and axially slidably supported near its other end on the support, a cross-member connected to said other end of the column and supporting positioning means, a foot support connected to the positioning means for pivotable movement relative thereto about an axis which extends parallel to the cross-memberforvarying the inclination of the foot support and means for adjusting the inclination of the foot support and releasably fastening the foot support with respect to the positioning means so as to locate the foot support at a desired inclination.
The invention will now be more particularly described with reference to the accompanying drawings which illustrate a chair with foot support and various embodiments of the means which alter the inclination of the foot support and lock the latter in the position of inclination selected, wherein:: Figure lisa side view of a chair, with a foot support arranged on the chair and with positioning devices which are associated with the foot support and which lock the latter in a desired position of inclination,
Figure 2 is a cross section view taken along the line ll-ll of Figure 1,
Figure 3 is a rear view of the chair shown in Figure 1,
Figure 4 is a view, on an enlarged scale, of a positioning device in the form of a retaining plate,
Figure 5 is a side view of a positioning device in the form of a force-locking presser means,
Figure 6 is a plan view of the positioning device shown in Figure 5,
Figure 7 is a side view of a positioning device in the form of a friction coupling actuatable by a foot lever,
Figure 8 is a plan view of the positioning device shown in Figure 7,
Figure 9 is a side view of a modified chair, with a foot support arranged on this chair and with a positioning device also associated with the latter,
Figure 10 is a cross-section view taken along the line X-X of Figure 9,
Figure 11 is a side view, on an enlarged scale, of the positioning device of Figures 9 and 10, and
Figure 12 is a plan view of the positioning device shown in Figure 11.
Referring to Figures 1 to 4 of the drawings, a foot support7 is arranged on a chair 1, comprising a supporting structure 2, a seat 3 mounted on the structure 2, a seat back 4 (which may be omitted), a base 5 and an upstanding support 6 which connects the supporting structure 2 to the base 5. The foot support 7 is arranged on the front of the chair and can be adjusted both in its heightwise position and also in its position of inclination. The mechanism of the foot support7 is shown in chain-dotted line in some of the Figures, so that this mechanism will not be obscured from view. For installing this foot support 7 on the chair 1, a column 8 is arranged parallel to the strut 6. The column 8 is preferably constructed as a telescopically extensible tube, in which the mutually telescopic parts 9, 10 slide one in the other, although they are prevented from rotation relative to each other.One telescopically extensible part 10 is connected to the supporting structure 2 of the chair 1, and the other part 9 is supported -- by a strap 11 which partially engages round the strut 6.
A cross member 12 is connected to one of the parts 9 of the column 8 and projects from the latter, on both sides, in cantilever fashion. This crossmember 12 has, at each of its free ends, a positioning device 13 for at least one positioning member for the foot support, and for connecting and securing the same. The positioning devices 13, 14-which, in this embodiment, are constituted as plate-shaped structures-comprise, in addition to an articulated extension 15 for the foot support 7, a retaining means 16 and a locking means 17. The locking means 17 is in the form of an elongated arcuate slot 18 having on one of its sides teeth 19 for engaging a retaining member 20. The foot support 7 itself comprises a substantially O-shaped frame 21, preferably having a platform mounted thereon.Formed on one side of the O-shaped frame 21 is an opening 22 for the introduction of the strut 6 and;on the other side of the frame 21, is a transverse bar 23, which is used both for reinforcing purposes and also as a guide for a rod 24 of the foot support 7. The transverse bar 23
is formed as a tube and receives the rod 24 which is provided with a cap 25 at one of its ends to prevent it from falling out and which has, at its other end, a bent portion 26. The free end of the bent portion 26 engages in a retaining point 27 provided on the positioning device 13.The foot support 7 can be pivoted, about its axis X, and can be secured, by means of the locking means 17, in the position of inclination desired at the time concerned on the positioning devices 13, 14, which are fast with the column 8 through the interposition of the cross-member 12.
The rod 24, whose end engages in the retaining point 27, allows the foot support 7 to move after each engagement. Thus, when the end of the rod 24 enters a guide slot 28 of the retaining point 27 in the direction of the axis X of the foot support 7, the teeth 19 and retaining member 20 are disengaged, whereas reengagement of the member 20 with the teeth 19 is effected by steering the end of rod 24 along slot 28 and away from the axis X.
For this purpose, and to permit pivotal movement of the foot support 7, the guide is constituted -- in the region of the connection between the foot support 7 and the positioning device 13 through rod 24 - as an angled guide slot 29 formed by two slots.
Accordingly, when the bent portion 26 of the rod 24 slides in the guide, both the rod 24 and also the locking means 17 are axially pulled orthrustforwards. In this way the foot support 7 moves, for example, forwards, that is to say it moves away from the column 8, and disengages the retaining means 16 and the locking means 17, so that the retaining member 20 can slide along the slot 18.
Alternatively, and as shown in Figures 5 and 6, the locking means 17 is in the form of a force-locking clamping means with a knurled screw 30 which, by releasing or securing plates 32 guided in friction cheeks 31, allows or prevents movement of the foot support 7. In this embodiment, the rod 24 may be replaced by a pin whose free ends were only mounted in bores 33.
Figures 7 and 8 show a further alternative in which
adjustment means 34 operable by a user's foot is
provided for cooperation with the positioning devices 13, 14. The adjustment means 34 are arranged in such a way that, when a pivotably mounted lever 35 disposed laterally of the foot sup
port is actuated, this lever 35 releases the locking means 17 when this lever 35 tilts forward, and locks the locking means 17 in position when the lever 35 tilts backwards. The provision of a lever 35 of this kind, which is actuatable by the user's foot, would certainly have the advantage that the foot support 7 could more easily be brought into a position f incli- nation, desired at any given time. This is because the user of the chair 1 would not have to leave the latter.
A securing memberwhich can be actuated bythe lever 35 undoubtedly depends on the value of the chair 1 and, in somewhat more elaborate chairs, can be constituted in this way, with foot lever, with retention of the foot support 7, its column 8, and also its adjustment members. The lever 35 may be replaced by a hand operable lever disposed in the region of the seat 3.
It has also been contemplated, for adjusting and locking the foot support 7, to provide a lever (not shown) parallel to the column 8 to make the foot support adjustable in heightwise position when this lever is connected to the support structure 2 of the chair 1. This lever could, through the intermediary of an actuating rod, actuate positioning devices 13, 14, which could be brought into a closed or open position by a cam if the clamping means comprised, for example, plates.
Referring to Figures 9 to 12 and in order to bring the foot support 7 into the position of inclination desired at any given time, and to secure the support 7 in this position, there may be associated with the positioning devices 13, 14, forked straps 36,37 which have, at one of their ends, forked prongs 38 with openings 39 for their form-locking connection with a retaining member 20 connected to the frame 21 of the foot support 7. These straps 36,37 are articulated, by their end lying remote from the prongs 38 and openings 39, to a lever 40 which moves them axially.The lever 40 itself is located between the respective positioning devices 13, 14 and the frame 21 of the foot support 7, and is also pivotably mounted about the axisX ofthisframe. The straplike positioning devices 13, 14 and the straps 36,37 are entrained by way of an extension 41 between lever 40 and positioning devices 13, 14; this extension is so formed that it does not oppose axial movement of the straps 36,37.In order to ensure the axial movement of the strap 36,37 towards the retaining member 20, and thus also to assure a form-locking connection of retaining member and straps, there is arranged, between the respective straps 36,37 and the positioning devices 13, 14 associated with this strap 36,37, a spring 42, one end of which is supported by the positioning devices 13, 14 and the other end of which is supported by the respective strap 36,37. The lever 40, which is used for actuating the strap 36,37 and which preferably lies at each longitudinal side of the frame 21, is rigidly connected to a shaft Y associated with it so that, when the lever is actuated on one side, the lever follows the path of actuation on the other side.It is ensured, by the expedient of thus coupling together the levers 40, that both straps 36,37 are brought into the retaining position or are disengaged from this retaining position, so that the retaining member 20 for the foot support 7 does not remain out of engagement in any phase of use and does not cause disturbances in operation of the chair to take place.
For the guidance of the strap 36,37 on the positioning device 13, 14 in a manner corresponding to the axial movement required, longitudinal guides 43, preferably in the form of slots, are provided on the straps, each strap having a longitudinal guide of this kind into which a guide part, for example a bent-over strap portion, engages as extension 44. This guide part, that is to say the extension 44, ensures a precise axial movement of the respective strap 36,37 towards the retaining member 20 or away from the latter so that, when the straps are moved into retaining position, the crescent shaped openings 39 provided on these straps form-lockingly engage round the retaining member.The retaining member 20, which is secured to the frame 21 of the foot support 7, can, according to the particular construction of the frame 21, be constituted as a short cam or as a rod which extends from strap to strap. What is solely
essential is that this retaining member 20 shall'bye guided in a guide 45 in the positioning devices 13,
14; this guide may be constituted as a slot, so as to restrict the position of inclination of the foot support 7 between two end positions of the slot, even when the strap 36 and/or 37 are disengaged. The remaining positions of inclination of the foot support 7 lies within the length of this guide 45 or this slot, and are determined by the number of prongs 38 and openings 39 in the straps 36,37.
In equipping the securing members, that is to say the straps 36,37 with the forked prongs 38 and openings 39, it has been found that three prongs and two openings are frequently adequate for determining the position of the foot support 7 within a relatively large range of inclined positions. However, this does not prevent the guide 45, e.g. the slot, on the positioning device 13,14 for the retaining member20 from being made longer; not does it prevent the straps 36,37 being equipped with more than three prongs 38 and two openings 39. The springs 42, by means of which the straps 36,37 are axially shifted, may be in the form of simple helical springs; these springs 42 only need a strength such that they will ensure a form-locking engagement of the prongs 38 and openings 39 on the retaining member 20. For the purpose of providing simple means for axially shifting the straps 36,37, these straps may be positioned, on the lever 40, a very short distance above the point at which the lever is articulated to the positioning devices 13, 14 so that, when the lever is pivoted aboutthis point of articulation, that is to say about this fulcrum, the straps 36,37 are pulled by the lever 40 in opposition to the force of the springs 42.
Claims (24)
1. A chair comprising a base, a supporting structure, a seat mounted on the supporting structure, a support which connects the supporting structure to the base and which is adjustable in length to raise and lower the seat in use with respect to the base, a telescopically extensible column connected at one end to and depending from the supporting structure and axially slidably supported near its other end on the support, a foot support, means connecting the foot support to the lower end of the column for pivotable movement about an axis normal or substantially normal to the axis of the column and releasable fastening means for releasably locating the foot support at a desired inclination, the telescopically extensible column permitting adjustment of the distance between the seat and the foot support.
2. A chair comprising a base, a supporting structure, a seat mounted on the supporting structure, a support which connects the supporting structure to the base and which is adjustable in length to raise and lower the seat in use with respect to the base, a telescopically extensible column connected at one end to and depending from the supporting structure and axially slidably supported near its other end on the support, a cross-member connected to said other end ofthe column and supporting positioning means, a foot support connected to the positioning means for pivotable movement relative thereto about an axis which extends parallel to the crossmember for varying the inclination of the foot support and means for adjusting the inclination of the foot support and releasablyfastening the foot support with respect to the positioning means so as to
locate the foot support at a desired inclination.
3. A chair as claimed in claim 2, wherein the positioning means is located at a free end of the crossmember, and said means for adjusting the inclination of the foot support and releasably fastening the foot support with respect to positioning means comprises mutually engageable locking and retaining means on the positioning means and foot sup
port respeciiveiy and a reiease device for effecting disengagement of said locking and retaining means.
4. A chair as claimed in claim 2 or claim 3 wherein the positioning means extends in a direction normal to the cross-member and the release device is disposed so as substantially to be co-axial with the axis about which the foot support is pivotable.
5. A chair as claimed in any one of claims 2-4, wherein the foot support comprises a frame having an opening lying in the vicinity of the support, and having a transverse bar which extends parallel to the cross-member.
6. A chair as claimed in claim 5, wherein the pivotable axis of the foot support extends through the transverse bar.
7. A chair as claimed in claim 6, wherein the pivotable axis of the foot support is constituted by a rod which forms the release device; and this rod has a bent-over portion at at least one of its ends, and co-operates with a retaining point.
8. A chair as claimed in any one of claims 2-7 wherein telescopically extensible parts of the column are guided so as to be axially slidable relative to one another, but prevented from pivoting relative to one another; and one of the parts is non-rotatably supported by the support structure and can be releasably secured to the other part.
9. A chair as claimed in claim 8, wherein one of said parts has positioning means for releasably locking the two parts of the column to each other.
10. A chair as claimed in claim 9, wherein the positioning means comprises a knurled wheel, and is carried by the part of the column which is supported by the support, the knurled wheel having a pin which can be urged against the other part.
11. A chair as claimed in any one of claims 2-10, wherein for supporting the column on the support, one part of the column has a strap which partially surrounds the support.
12. A chair as claimed in claim 11, wherein the strop is supported by the support through the intermediary of means which run along the support with only small frictional contact.
13. A chair as claimed in claim 2 wherein the means for releasably fastening the foot support with respect to the positioning means comprises forcelocking clamping means.
14. A chair as claimed in claim 12, wherein the clamping means comprises a knurled screw which clamps plates to friction cheeks.
15. A chair as claimed in claim 12, wherein the clamping means is an eccentric which clamps the foot support to the positioning means.
16. A chair as claimed in any one of claims 2-15, wherein the foot support adjusting means is operafivejyconnected to a foot operable lever.
17. A chair as claimed in any one of claims 2-15, wherein the foot support adjusting means is operatively connected to a hand operable lever.
18. A chair as claimed in claim 16, wherein the foot operable lever is disposed laterally of the foot support.
19. A chair as claimed in claim 17, wherein the hand operable lever is disposed in the region of the seat.
20. A chair as claimed in claim 2, wherein the foot support adjusting and fastening means comprises at least one forked strap having at or adjacent to one of its ends at least two forked opening and three prongs which define these openings and, at or adjacent to its other end, an articulation for its extension on the positioning means, and a lever which actuates it, the extension on the positioning means being axially shiftable, and the forked strap being axially biased by resilient means which are connected to the positioning means; there being arranged on the foot support a retaining member for which there is provided, on the forked strap, the prongs and openings as different retaining positions and, on the positioning means, a guide which defines limit positions.
21. A chair as claimed in claim 20, wherein the guide is a slot.
22. A chair as claimed in claim 19, wherein when two straps are provided, these straps are coupled to one another and are operable by a common lever.
23. A chair as claimed in any one of the preceding claims, wherein the seat is rotatable with respect to the base.
24. A chair substantially as herein described with reference to and as shown in Figures 14, or 5 and 6, or 7 and 8, or 9-12 of the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772709960 DE2709960A1 (en) | 1977-03-08 | 1977-03-08 | Swivel chair with vertically adjustable frame - has foot rest designed for height and axial displacement for optimum comfort |
| GB7837611A GB2030853B (en) | 1977-03-08 | 1978-09-21 | Chair with adjustable footrest |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772709960 DE2709960A1 (en) | 1977-03-08 | 1977-03-08 | Swivel chair with vertically adjustable frame - has foot rest designed for height and axial displacement for optimum comfort |
| GB7837611A GB2030853B (en) | 1977-03-08 | 1978-09-21 | Chair with adjustable footrest |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2030853A true GB2030853A (en) | 1980-04-16 |
| GB2030853B GB2030853B (en) | 1982-11-03 |
Family
ID=42936745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7837611A Expired GB2030853B (en) | 1977-03-08 | 1978-09-21 | Chair with adjustable footrest |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2709960A1 (en) |
| GB (1) | GB2030853B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2269316A (en) * | 1992-08-03 | 1994-02-09 | Kerrison Furnishing Limited | Footrest adjustment |
| CN109552120A (en) * | 2018-12-20 | 2019-04-02 | 安徽永驰婴童安全科技有限公司 | Foot-treadle device and child safety seat |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE438960B (en) * | 1982-05-04 | 1985-05-28 | Permobil Ab | Wheelchair footrest device |
| GB2412307A (en) * | 2004-03-23 | 2005-09-28 | Sunpex Technology Co Ltd | Twin tubular anti rotating seat support for invalid carriage. |
-
1977
- 1977-03-08 DE DE19772709960 patent/DE2709960A1/en not_active Withdrawn
-
1978
- 1978-09-21 GB GB7837611A patent/GB2030853B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2269316A (en) * | 1992-08-03 | 1994-02-09 | Kerrison Furnishing Limited | Footrest adjustment |
| CN109552120A (en) * | 2018-12-20 | 2019-04-02 | 安徽永驰婴童安全科技有限公司 | Foot-treadle device and child safety seat |
| CN109552120B (en) * | 2018-12-20 | 2023-12-01 | 安徽永驰婴童科技股份有限公司 | Pedal device and child safety seat |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2709960A1 (en) | 1978-09-14 |
| GB2030853B (en) | 1982-11-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee | ||
| PCPE | Delete 'patent ceased' from journal |
Free format text: 4934, PAGE 3132 |
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| PCNP | Patent ceased through non-payment of renewal fee |