GB2405086A

GB2405086A - Adjustable chassis for a chair

Info

Publication number: GB2405086A
Application number: GB0421491A
Authority: GB
Inventors: Yao-Chuan Wu
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-28
Filing date: 2004-09-28
Publication date: 2005-02-23
Anticipated expiration: 2024-09-28
Also published as: GB0421491D0; JP3108304U; GB2405086B

Abstract

An adjustable chassis for a chair includes a base member, a support member, and two support levers. Thus, the drive lever of the base member is drawn and moved by the first wire so as adjust the height of the chair seat relative to the adjustable chassis. In addition, the locking plate of the base member is drawn and moved by the second wire so as adjust the inclined angle of the chair backrest relative to the adjustable chassis. Further, the locking block is drawn and moved by the third wire so as adjust the position of the chair seat relative to the adjustable chassis.

Description

DJUSTABLE CHASSIS FOR CHAIR

B1CKGllOUND OF THE INVENTION _2].cld of lhe_lnventon the pescnt invention relates to ai1 adjustable chassis, and more partic.!arly to an adjustable chassis for a chair.

2. Deuce An of the Related Art A conventional chair has a fixed structure that cannot be adjusted to fit a user's body ergonomically, so that the user easily feels uncomfortable when seated on the chair during a long period of time. In addition, the conventional chair has a fixed size and cannot be adjusted to fit statures of different users, thereby limiting the versatility of the conventional chair.

SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided an adjustable chassis for a chair, comprising a base member, a support member, and two support levers, wherein: the base member includes a housing having two sides each formed with a first pivot hole and a second pivot hole, a socket mounted in the housing, a bracket mounted on the socket, a drive lever pivotally mounted on the bracket and having an end drawn and moved by a first wire, a fixing seat mounted in the housing, a receiving seat mounted on the fixing seat, an inverted T-shaped locking plate movably mounted in the receiving seat and drawn and moved by a second wire; the support member includes a board having two sides each formed with a pivot bore pivotally mounted on the first pivot hole ofthc housing of the base member by a pivot shaft and Erich kinked with fin c]ogated hole, and a locking seat Tech on a bottom of the h:1artl and -nnecl witll a plurality of locking grooves; the locking plate of the base member is detachably locked in either one of the locking grooves of the locking seat of the support member, so that the support member is fixed on the base member; each of the support levers has a first pivot hole pivotally mounted on the second pivot hole of the housing of the base member and a second pivot hole pivotally mounted on the elongated hole of the board of the support member, so that each of the support levers is pivotally mounted between the housing of the base member and the board of the support member.

The primary objective of the present invention is to provide an adjustable chassis for a chair, wherein the adjustable chassis has multiple adjusting functions, thereby enhancing the versatility of the adjustable chassis.

Another objective ofthe present invention is to provide an adjustable chassis for a chair, wherein the height ofthe chair seat relative to the adjustable chassis, the inclined angle of the chair backrest relative to the adjustable chassis and the position of the chair seat relative to the adjustable chassis are adjustable to fit a user's requirements.

A further objective of the present invention is to provide an adjustable chassis for a chair, wherein the drive lever of the base member drawn and moved by the first wire so as adjust the height of the chair se at relative to the adjustable chassis.

A further objective of the present invention is to provide an adjustable chassis for a chair, wherein the locking plate of the base member is drawn and moved by the second wire so as adjust the inclined angle of the chair backrest relative to the adjustable chassis.

A further objective of the present invention is to provide an adjustable chassis for a chair, wherein the locking block is drawn and moved by the third wire so as adjust the position of the chair seat relative to the

adjustable chassis.

Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a partially cut-away perspective view of an adjustable chassis for a chair in accordance with the preferred embodiment of the present invention; Fig. 2 is a partially exploded perspective view of the adjustable chassis for a chair Fig. 1; Fig. 3 is a partially exploded perspective view of the adjustable chassis for a chair Fig. I l- ig. 4 is a partially expl->clecl per.C,pective view of the adjustable chassis for a chair Fig. 1; l ig. 5 is a side plan coss-scctional view ofthe adjustable chassis for a chair as shown in laid. 1; Fig. 6 is an exploded perspective view of an adjuster of the adjustable chassis for a chair in accordance with the preferred embodiment of the present invention; l0 Fig. 7 is an exploded perspective view of an adjuster ofthe adjustable chassis for a chair in accordance with the preferred embodiment of the present invention; Fig. 8 is a partially exploded perspective view of an adjustable chassis for a chair in accordance with another embodiment of the present invention; and Fig. 9 is a partially side plan crosssectional view of an adjustable chassis for a chair in accordance with another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to Figs. 1-5, an adjustable chassis l for a chair in accordance with the preferred embodiment of the present invention comprises a base member 10, and a support member 20 mounted on the base member 10.

The base member 1() inc]ude.s. housing l()O having two sides each J<, i^ned with a first pivot Lyle l O l arid a second pivot lion 102, a soccer l I mounted in the housing 100, a bracket 12 mounted on the socket 11, a drive lever 13 pivotally mounted on the bracket 12 and having a first end secured on a pneumatic bar (not shown) mounted in the socket ll to lift or lower the pneumatic bar and a second end drawn and moved by a first wire 51, a fixing seat 14 mounted in the housing 100, a receiving seat 16 mounted on the fixing lO seat 14, an inverted T-shaped locking plate 15 movably mounted in the receiving seat 16 and drawn and moved by a second wire 181.

The base member 10 further includes a threaded shaft 17 extended through a hole 151 of a vertical wall of the locking plate l S. a threaded sleeve 18 screwed onto a first end of the threaded shaft 17, a first spring 171 urged between the vertical wall of the locking plate 15 and a second end of the threaded shaft 17, a second spring 172 urged between the vertical wall of the locking plate 15 and the receiving seat 16, and a roller 162 mounted in the receiving seat 16. The second wire 181 is extended through the roller 162 and a hole 161 of the receiving seat 16 and has an end fixed on the threaded sleeve 18.

The support member 20 is combined with a chair seat (not shown) and includes a board 200 having two sides each formed with a pivot bore 22 pivotally mounted on the first pivot hole 101 of the housing] 00 of the base member 10 by a pivot shaft 4 and each formed with an elongated hole 23, and a locking scat 24 fixed on a bottom o-fthe board 20() arid formed with a plurality of locking grooves 241, and the locking plate]5 of to base mcinler 1() is detachably locked in either one ofthe locking grooves 241 oft.he locking seat 24 of the support member 20, so that the support member 20 is fixed on the base member 10. A conducting tube 28 is mounted on the board 200 of the support member 20 to receive the first wire 51.

The support member 20 further includes two slides 25 each slidably mounted on the board 200 and each including a slide plate 251 slidably mounted in a guide slot 26 of the board 200 and limited by a U-shaped limit seat 252, and a cap 255 fixed on the slide plate 251 and formed with a plurality of locking recesses 256, a mounting seat 53 mounted on the board 200, a locking block 532 movably mounted in the mounting seat 53 and having a first end detachably locked in either one of the locking recesses 256 of the cap 255 of one of the two slides 25 to fix the slides 25 on the board 200 and a second end drawn and moved by a third wire 52, and a spring 531 (see Fig.7) mounted in the mounting seat 53 and urged on the locking block 532 to push the locking block 532 toward the slides 25. The chair seat is fixed on the slides 25 to move therewith.

The housing 100 of the base member 10 has an end formed with a through hole 103, the board 200 of the support member 20 has an end formed with a through hole 21, and the adjustable chassis l further comprises a threaded rod 41 extended through the through hole 21 oft.he board 200 and the tlroi..gh loose 103 ofthe housing 100 of the base member lO arid screwed irt-' an elastic art ju,tig member 1 9 1 to iorm an adjusting unit 1 9.

The adjustable chassis I further comprises two support levers 3 combined with a chair backrest (not shown) and each having a first pivot hole 31 pivotally mounted on the second pivot hole 102 of the housing 100 of the base member 10 and a second pivot hole 32 pivotally mounted on the elongated hole 23 of the board 200 of the support member 20, so that each of the two support levers 3 is pivotally mounted between the housing l OO of the base member 10 and the board 200 of the support member 20.

In operation, the drive lever 13 of the base member 10 is drawn and moved by the first wire 51 to press the pneumatic bar mounted in the socket 11 to lift or lower the pneumatic bar so as to adjust the height of the chair seat relative to the adjustable chassis 1.

Alternatively, the locking plate 15 of the base member 10 is drawn and moved by the second wire 181 to detach from the respective locking groove 241 of the locking seat 24 of the support member 20, thereby detaching the support member 20 from the base member 10, so that the support member 20 is pivoted relative to the base member 10 and has a cushioning effect by the adjusting unit 19. At this time, each of the two support levers 3 is pivotally mounted between the base member 10 and the support member 20, so that each of the two support levers 3 is pivoted relative to the base member 10 by the pivot action of tle support member 20 so as to adjust the inclined angle of the ch.-rir backrest relative to tlc acl jrstablc. c1135sis 1.

liltcrnailvcly, the l:clcig block S-$2 is drawn n:1 moved by the third wire 52 to detach -from the respective locli,g recess 256 of the cap 255 of the respective slide 25, thereby detaching the slides 25 from the board 200, so that the slides 25 arc movable relative to the board 200 to move the chair seat relative to the board 200 so as to adjust the position of the chair seat relative to the adjustable chassis 1.

Accordingly, the drive lever]3 of the base member 10 is drawn and moved by the first wire 51 so as adjust the height of the chair seat relative to the adjustable chassis 1. In addition, the locking plate 15 of the base member 10 is drawn and moved by the second wire 18 l so as adjust the inclined angle of the chair backrest relative to the adjustable chassis 1. Further, the locking block 532 is drawn and moved by the third wire 52 so as adjust the position of the chair seat relative to the adjustable chassis 1.

Referring to Fig. 6, the first wire 51 is drawn and moved by a reciprocating adjuster 5 having a rotation shaft 55 for mounting the first wire 51. Preferably, the reciprocating adjuster 5 is mounted on a proper position of the adjustable chassis 1.

Referring to Fig. 7, each ofthe second wire 181 and the third wire 52 is drawn and moved by a reciprocating adjuster 54 having a rotation shaft 56 for mounting the second wire 181 or the third wire 52. The rotation shaft 56 of the reciprocating adjuster 54 has a retaining groove 57 for retaining the second wir<' 181 or the third wire 52. Prelerably, the reciprocating *djtst:ei 54 is mounted on a proper position -the adjustable chassis 1.

Referring to Fig. 8, the adjusta.b].e chassis I further coml:'riscs a casing 6 including a first shell 61 mounted on the board 200 of the support member 20 and having a hole 6].2 and a conduit 613 for passage ofthe first wire 51, and a second shell 62 mounted on the board 200 of the support member 20 and combined with the first shell 61. The mounting seat 53 of the support member 20 is mounted on the second shell 62 of the casing 6. The support member 20 has a periphery formed with a plurality of screw bores 27, the first shell 61 of the casing 6 has a periphery formed with a plurality of fixing holes 611 fixed on the respective screw bores 27 of the support member 20, and the second shell 62 of the casing 6 has a periphery formed with a plurality of fixing holes 61 fixed on the respective screw bores 27 of the support member 20.

Referring to Fig. 9, the threaded sleeve 18 is formed with a first pin hole 182, the threaded shaft 17 is formed with a second pin hole 173, and the adjustable chassis 1 further comprises a fixing pin 7 extended through the first pin hole 182 of the threaded sleeve 18 and the second pin hole 173 of the threaded shaft 17, so that the threaded sleeve 18 is fixed on the threaded shaft 17.

Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possThle modifications and variations can be made without departing from the -,c<:,pe ol trite present invention. It is, tliereforc, contemplated that the appended claim or claims wild cover such modiDrcations and variations that fall within the true scope ofthe invention.

Claims

WHAT IS CLAIMED IS: -

1. An adjustable chassis for a c]air, conprising a base member, a support member, and two support Jcvc,s, wleein: the base rnemI-;er includes a} using l-vir:, two sidles each i:ornecI with a first pivot Lyle and a second pivot hole, a socket nountecl in tlJe housing, a bracket mounted on the socket, a drive lever pivotally mounted on the bracket and having an end drawn and moved by a first wire, a fixing seat mounted in the housing, a receiving seat mounted on the fixing seat, an inverted T- shaped locking plate movably mounted in the receiving seat and drawn and moved by a second wire; the support member includes a board having two sides each formed with a pivot bore pivotally mounted on the first pivot hole of the housing of the base member by a pivot shaft and each formed with an elongated hole, and a locking seat fixed on a bottom of the board and formed with a plurality of locking grooves; the locking plate of the base member is detachably locked in either one of the locking grooves of the locking seat of the support member, so that the support member is fixed on the base member; each of the support levers has a first pivot hole pivotally mounted on the second pivot hole of the housing of the base member and a second pivot hole pivotally mounted on the elongated hole of the board of the support member, so that each of the support levers is pivotally mounted between the housing of the base member and the board of the support member.

9-l he ad jistab]e cha,s,s ill accordance with claim l, wherein the h.ise IncH,-ibOr itllihC: inc]iles a '.hreailed shaft extendecl through a hole of a vertical wall of the locking plate, a threaded sleeve screwed onto a first end of the threaded shaft, a first spring urged between of the vertical wall of the locking plate and a second end of the threaded shaft, a second spring urged between the vertical wall of the locking plate and the receiving seat, and a roller mounted in the receiving seat.

3. The adjustable chassis in accordance with claim l, wherein the second wire is extended through the roller and a hole of the receiving seat and has an end fixed on the threaded sleeve.

4. The adjustable chassis in accordance with claim 1, wherein the support member further includes a conducting tube mounted on the board to receive the first wire.

5. The adjustable chassis in accordance with claim l, wherein the support member further includes a mounting seat mounted on the board, a locking block movably mounted in the mounting seat and drawn and moved by a third wire, and two slides each slidably mounted on the board and each detachably locked by the locking block.

6. The adjustable chassis in accordance with claim S. wherein each of the slides includes a slide plate slidably mounted in a guide slot of the board and limited by a U-shaped limit seat, and a cap fixed on the slide plate and formed with a plurality of locking recesses, and the locking block has a first cold s:'etachab]y loci ed in either one of to locking ^eccsses ol the cap of <ones of ire two slides to fix the slides on flee 1jor3rd and -a sc-,c.,ond Ciit1 (ii.-'\.'ll mid niovel by the third wire.

7. The adjustable chassis in accordance with claim 5, wherein the support member further includes a spring mounted in the mounting seat and urged on the locking block to push the locking block toward the slides.

8. The adjustable chassis in accordance with claim l, wherein the housing ofthe base member has an end formed with through hole, the board of the support member has an end formed with through hole, and the adjustable chassis further comprises a threaded rod extended through the through hole of the board and the through hole of the housing of the base member and screwed into an elastic adjusting member to forth an adjusting unit.

9. The adjustable chassis in accordance with claim 1, wherein the first wire is drawn and moved by a reciprocating adjuster having a rotation shaft for mounting the first wire.

lO. The adjustable chassis in accordance with claim 9, wherein the reciprocating adjuster is mounted on a proper position of the adjustable chassis.

11. The adjustable chassis in accordance with claim 1, wherein the second wire is drawn and moved by a reciprocating adjuster having a rotation S6:!!t for muting the second wire.

12. The ad jusable chassis in accordance with claim 11, whcleill tile 5rotation shaft ol the reciprocating adjuster has a retaining groove for retaining the second wire.

13. The adjustable chassis in accordance with claim 11, wherein the reciprocating adjuster is mounted on a proper position of the adjustable chassis.

014. She adjustable chassis in accordance with claim 5, wherein the third wire is drawn and moved by a reciprocating adjuster having a rotation shaft for mounting the third wire.

15. The adjustable chassis in accordance with claim 14, wherein the rotation shaft of the reciprocating adjuster has a retaining groove for retaining 5the third wire.

16. The adjustable chassis in accordance with claim 14, wherein the reciprocating adjuster is mounted on a proper position of the adjustable chassis.

17. The adjustable chassis in accordance with claim 1, further 20comprising a casing including a first shell mounted on the board of the support member and having a hole and a conduit for passage of the first wire, and a second shell mounted on the board of the support member and combined with the flu st shell.

18. I h:. ad':.L<.ble c}-axsis in.'ccord.rice with cluing 1, whereir, the ScIJl: T-- ebc I Is -il,1ciy Ivred N;!i4.}] Ci 1,1!1ity of.sciev' boles, tle first shell of the casing has a periphery -rinecl with a plurality of fixing holes fixed on the respective screw bores of the support member, and the second shell of the casing has a periphery formed with a plurality of fixing holes fixed on the respective screw bores of the support member.

19. The adjustable chassis in accordance with claim 1, wherein the threaded sleeve is formed with a first pin hole, the threaded shaft is formed with a second pin hole, and the adjustable chassis further comprises a fixing pin extended through the first pin hole of the threaded sleeve and the second pin hole of the threaded shaft, so that the threaded sleeve is fixed on the threaded shaft.

20. An adjustable chassis for a chair substantially as hereinbefore described with reference to and as shown in the accompanying drawings.