NL1039716C2 - Backrest inclination structure for lumbar support. - Google Patents

Backrest inclination structure for lumbar support. Download PDF

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Publication number
NL1039716C2
NL1039716C2 NL1039716A NL1039716A NL1039716C2 NL 1039716 C2 NL1039716 C2 NL 1039716C2 NL 1039716 A NL1039716 A NL 1039716A NL 1039716 A NL1039716 A NL 1039716A NL 1039716 C2 NL1039716 C2 NL 1039716C2
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NL
Netherlands
Prior art keywords
support
support plate
backrest
back support
spring
Prior art date
Application number
NL1039716A
Other languages
Dutch (nl)
Inventor
Tung-Chun Pan
Original Assignee
Oasyschair Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oasyschair Co filed Critical Oasyschair Co
Priority to NL1039716A priority Critical patent/NL1039716C2/en
Application granted granted Critical
Publication of NL1039716C2 publication Critical patent/NL1039716C2/en

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • 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
    • A47C7/444—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 of torsion type
    • 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
    • A47C1/024—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination
    • A47C1/027—Reclining or easy chairs having independently-adjustable supporting parts the parts, being the back-rest, or the back-rest and seat unit, having adjustable and lockable inclination by means of clamps or friction locking members

Description

Title: BACKREST INCLINATION STRUCTURE FOR LUMBAR SUPPORT
BACKGROUND OF THE INVENTION
[0001] 1. Technical Field
[0002] The present invention relates to backrest inclination structures for lumbar support, and more particularly, to a backrest inclination structure that provides lumbar support 5 and operates in conjunction with a backrest adjustment mechanism positioned at a chair laterally. When in use, the backrest inclination structure can be operated easily to adjust a backrest of the chair and attain the most comfortable position of the backrest by pressing the human back against the backrest under the weight of the human back. Furthermore, the backrest inclination structure not only enables the human back to come into tight contact with 10 the adjusted backrest, but also enables the backrest adjustment mechanism to be fixed in place again, thereby simplifying the backrest adjustment assembly and enhancing the comfort provided by the backrest.
[0003] 2. Description of Related Art
[0004] To enable existing chairs to provide maximum comfort to sitters, related 15 manufacturers usually consider equipping a chair with a motion adjustment mechanism whereby a cushion unit, a backrest unit, and an armrest unit of the chair can undergo directional adjustment as needed, so as to enhance the flexibility of use of the chair.
[0005] A related developer proposed an adjustment unit installed on the backrest of a chair, and filed a patent application based thereon with the application number 12/335,706 20 entitled “Angle-adjusting structure for backrest of chair”, and then a patent was issued to the patent application on September 28, 2010. The angle-adjusting structure for backrest of chair disclosed in the aforesaid patent application is implemented in the form of an angle-adjusting structure being mounted at a rear side of a butterfly-shaped mounting member of the chair, and it comprises: a shaft having external teeth and passing through internal holes of a main 25 body and a rotating member; a resilient element mounted around an end of the shaft; a cover secured to the main body by a threaded fastener; and a pressing member mounted on an opposite end of the shaft adjacent to an outer wall of the main body; wherein by pressing the pressing member inward, the external teeth of the shaft are disengaged from the internal teeth of the rotating member, allowing the rotating member to enter a free state for adjusting to any 1 0397 1 6 2 angle, and when the pressing member is released, the resilient element mounted around the end of the shaft extends outward to re-engage the external teeth of the shaft with the internal teeth of the rotating member, thereby securing the rotating member in place.
[0006] Although the aforesaid angle-adjusting structure for backrest of chair allows 5 the backrest of a chair to undergo anticipated angle adjustment when in use, only a portion of the backrest can be in contact with the human back while the adjustment of the inclination of the backrest is taking place, not to mention that the angle-adjusting structure for backrest of chair comprises plenty of constituent components which complicate an assembly process and thus incur high costs in the manufacturing process of the chair.
10
SUMMARY OF THE INVENTION
[0007] A conventional backrest adjustment unit positioned at a chair laterally consists of too many constituent elements and thus renders an assembly process thereof complicated, not to mention that only a portion of a backrest of the chair is in contact with the back of a 15 person sitting on the chair, thanks to the conventional backrest adjustment unit. The present invention is intended to overcome the aforesaid drawbacks of the prior art. According to the present invention, a backrest adjustment mechanism positioned at a chair laterally comprises a spring continuous control unit for limiting the position of a support plate pivotally coupled to a backrest from the rear to enable a sitter on the chair to lift the spring continuous control unit 20 by hand to allow the spring continuous control unit to unlock and enter a free state, such that the backrest pivotally coupled to the support plate can be adjusted to a preset position and direction when the backrest comes into contact with the human back and under the weight thereof. After a required back contact position has been attained, the sitter presses the spring continuous control unit by hand to allow the spring continuous control unit to return to a 25 locked state and then position precisely the backrest pivotally coupled to the support plate, such that the human back can come into tight contact with the adjusted backrest. Hence, the backrest adjustment mechanism is effectively simplified and thus enhances the comfort given to the sitter.
[0008] The primary objective of the present invention is to provide a backrest 30 inclination structure for lumbar support, comprising: a backrest adjustment mechanism positioned at a chair laterally; a spring continuous control unit disposed at an end of a butterfly-shaped mounting member at a bottom of the chair, wherein the spring continuous control unit guides a link member beside a backrest in performing an unlocking operation or a locking operation; a support-connection portion formed on a rear side of the spring 3 continuous control unit and directionally fixed to a lower end of a support plate with a preset width and extension length; two hollow tubes spaced apart from each other and formed at an upper end of the support plate; a connection tube formed at a rear side and a mass-center position of the backrest, wherein the two hollow tubes straddle the connection tube 5 horizontally; two hollow bodies introduced along the hollow tubes of the support plate, respectively, and positioned in the connection tube of the backrest; a shaft penetrating the two hollow bodies and the connection tube of the backrest and directionally screwed to another end of the connection tube of the backrest with a screw nut, such that the backrest is pivotally coupled to the support plate; and a torque spring having appropriate resilience and inserting 10 into inward sides of the hollow bodies of the hollow tubes of the support plate, wherein the torque spring has a pin abutting against the rear side of the backrest and another pin abutting against a rear side of the support plate to abut against the backrest with appropriate resilience.
[0009] A sitter on the chair lifts the spring continuous control unit by hand to enable the spring continuous control unit to unlock and enter a free state and thereby enable the 15 backrest adjustment mechanism to drive controllably the backrest to perform directional adjustment, such that the backrest pivotally coupled to the support plate undergoes preset directional adjustment as soon as the backrest comes into contact with a human back under a weight thereof. After a required back contact position has been attained, the sitter presses the spring continuous control unit by hand to allow the spring continuous control unit to return to 20 a locked state and then position precisely the backrest pivotally coupled to the support plate, such that the human back can come into tight contact with the adjusted backrest. Alternatively, the sitter lifts the spring continuous control unit by hand to enable the spring continuous control unit to enter a free state in a manner that the backrest undergoes seamless displacement along with the human back so as to give comfort to the sitter and protect the 25 sitter against lumbago and kyphosis which are common among sedentary individuals, not to mention that the backrest adjustment mechanism is effectively simplified and thus cuts chair manufacturing costs.
[0010] Another objective of the present invention is to provide a backrest inclination structure for lumbar support, comprising a backrest adjustment mechanism positioned at a 30 chair laterally. The backrest adjustment mechanism is provided with covering plates corresponding in shape thereto and pressing against the support plate coupled to the backrest from the front and rear to cover a bottom and the hollow tubes of the support plate directionally with upper and lower ends of the front and rear covering plates and fix the front 4 and rear covering plates to preset positions of the support plate with screwing elements such that the support plate pivotally coupled to the backrest has aesthetic appearance.
[0011] Yet another objective of the present invention is to provide a backrest inclination structure for lumbar support, comprising a backrest adjustment mechanism 5 positioned at a chair laterally. The backrest adjustment mechanism is provided with covering plates pressing against the support plate coupled to the backrest from the front and rear. Through holes corresponding in position to the connection tube of the backrest and the two hollow tubes of the support plate are formed in the front covering plate to facilitate adjustment of movement between the support plate and the backrest. A hollowed-out zone is formed at 10 the lower end of the rear covering plate to allow screwing elements to lock together the support plate and the support-connection portion on the rear side of the spring continuous control unit when the lower end of the support plate is covered, or facilitate subsequent removal of the screwing elements. Protruding portions spaced apart from each other protrude from the bottom of the rear covering plate and insert into apertures of the plate, respectively, 15 as soon as an L-shape plate abuts against the hollowed-out zone, such that the rear covering plate has aesthetic appearance.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a perspective view of a backrest assembly coupled to a chair 20 according to the present invention;
[0013] FIG. 2 is an exploded view of a backrest adjustment mechanism integrated with the chair according to the present invention;
[0014] FIG. 3 is a schematic view of backrest adjustment elements disposed at the bottom of the chair according to the present invention; 25 [0015] FIG. 4 is a side view of a backrest installed on the chair laterally prior to movement according to the present invention;
[0016] FIG. 5 is a schematic view of the backrest installed on the chair laterally during forward movement according to the present invention; and
[0017] FIG. 6 is a schematic view of the backrest installed on the chair laterally during 30 backward movement according to the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION
[0018] Referring to FIGs. 2, 3, the present invention provides a backrest inclination structure for lumbar support. As shown in the diagrams, the backrest inclination structure for 5 lumbar support has a backrest adjustment mechanism 8 positioned at a chair 9 laterally, further comprising a spring continuous control unit 2 disposed at the end of a butterfly-shaped mounting member 1 at the bottom of a chair. The spring continuous control unit 2 comprises a control lever 21 penetrating and straddling the end of the butterfly-shaped mounting member 5 1, a support-connection portion 22 pivotally coupled to the end of the butterfly-shaped mounting member 1, and a linking spring 23 with one end abutting against the inner side of the support-connection portion 22. Referring to FIG. 2, due to the distance Y shown in FIG. 3, a spring 212 disposed at a lever 211 beside the control lever 21 is prevented from being compressed excessively to stick outward while the lever 211 is being lift; meanwhile, metal 10 plates 213 at one end of the spring 212 are spaced apart from each other to a greater extent to drive the linking spring 23 in the vicinity thereof to enter a free rotation state. As a result, another pin of the linking spring 23 and the support-connection portion 22 abutting against the end of the butterfly-shaped mounting member 1 are movable relative to each other. Conversely, once the lever 211 at one end of the control lever 21 is pressed downward (i.e., 15 being rotated rightward as shown in FIG. 3), the distance X shown in FIG. 3 causes the spring 212 to be compressed outward; meanwhile, the metal plates 213 at one end of the spring 212 are compressed to drive the linking spring 23 in the vicinity thereof to enter a locked state. As a result, another pin of the linking spring 23 and the support-connection portion 22 abutting against the end of the butterfly-shaped mounting member 1 are fixed in place relative to each 20 other, whereas a link member (driving a backrest 3 to undergo forward and backward displacement) beside the backrest 3 is guided by the spring continuous control unit 2 to perform an unlocking operation or a locking operation. The advantages of the backrest inclination structure of the present invention are described hereunder.
[0019] The support-connection portion 22 formed on the rear side of the spring 25 continuous control unit 2 is directionally fixed to the lower end of a support plate 4 with a preset width and extension length. Two hollow tubes 41 spaced apart from each other are formed at the upper end of the support plate 4. A connection tube 31 formed at the rear side and a mass-center position of the backrest 3. The two hollow tubes 41 straddle the connection tube 31 horizontally. Before the support plate 4 straddles on the connection tube 31 located at 30 the mass-center position of the backrest 3, the support plate 4 is clamped between front and rear covering plates 5, 6 corresponding in shape thereto from the front and the rear, respectively (as shown in FIG. 2), in the manner that the upper and lower ends of the front and rear covering plates 5, 6 cover the two hollow tubes 41 and the bottom of the support plate 4, respectively. The front and rear covering plates 5, 6 are screwed to preset positions of 6 the support plate 4 and thus fixed thereto by means of screwing elements 42, such that the support plate 4 pivotally coupled to the backrest 3 has aesthetic appearance.
[0020] Through holes 51 corresponding in position to the connection tube 31 of the backrest 3 and the two hollow tubes 41 of the support plate 4 are formed in the front covering 5 plate 5 to facilitate adjustment of movement between the support plate 4 and the backrest 3. A hollowed-out zone 61 is formed at the lower end of the rear covering plate 6 to allow screwing elements 43 to lock together the support plate 4 and the support-connection portion 22 on the rear side of the spring continuous control unit 2 when the lower end of the support plate 4 is covered, or facilitate subsequent removal of the screwing elements 43. Protruding 10 portions 62 spaced apart from each other protrude from the bottom of the rear covering plate 6 and insert into apertures 71 of the plate 7, respectively, as soon as an L-shape plate 7 abuts against the hollowed-out zone 61, such that the rear covering plate 6 has aesthetic appearance.
[0021] After the two hollow tubes 41 formed at the upper end of the support plate 4 have horizontally straddled the connection tube 31 located at the mass-center position of the 15 backrest 3, two hollow bodies 44 are introduced along the hollow tubes 41 of the support plate 4, respectively, and positioned in the connection tube 31 of the backrest 3. A shaft 45 penetrates the two hollow bodies 44 and the connection tube 31 of the backrest 3 and directionally screwed to another end of the connection tube 31 of the backrest 3 with a screw nut 46, such that the backrest 3 is pivotally coupled to the support plate 4 (as shown in FIG. 1).
20 A torque spring 47 having appropriate resilience is inserted into inward sides of the hollow bodies 44 of the hollow tubes 41 of the support plate 4. The torque spring 47 has a pin 471 abutting against the rear side of the backrest 3 and another pin 472 abutting against the rear side of the support plate 4 to abut against the backrest 3 with appropriate resilience (as shown in FIG. 4).
25 [0022] A sitter on the chair lifts the spring continuous control unit 2 by hand to enable the spring continuous control unit 2 to unlock and enter a free state and thereby enable the backrest adjustment mechanism 8 to drive controllably the backrest 3 to perform directional adjustment, such that the backrest 3 pivotally coupled to the support plate 4 undergoes preset directional adjustment as soon as the backrest 3 comes into contact with a human back under 30 a weight thereof (as shown in FIGs. 5, 6). After a required back contact position has been attained, the sitter presses the spring continuous control unit 2 by hand to allow the spring continuous control unit 2 to return to a locked state and then position precisely the backrest 3 pivotally coupled to the support plate 4, such that the human back can come into tight contact with the adjusted backrest 3. Alternatively, the sitter lifts the spring continuous control unit 2 7 by hand to enable the spring continuous control unit 2 to enter a free state in a manner that the backrest 3 undergoes seamless displacement along with the human back so as to give comfort to the sitter and protect the sitter againstlumbago and kyphosis which are common among sedentary individuals, not to mention that the backrest adjustment mechanism 8 is effectively 5 simplified and thus cuts chair manufacturing costs.
1039716

Claims (3)

1. Een rugsteunhellingsconstructie voor lumbale ondersteuning, omvattende: een rugsteuninstelmechanisme dat bij een stoel lateraal is gepositioneerd; een veer-continue besturingseenheid die bij een uiteinde van een vlindervormig bevestigingsorgaan bij een onderkant van de stoel is geplaatst, waarbij de 5 veer-continue besturingseenheid bij het uitvoeren van een ontgrendelhandeling of een vergrendelhandeling een koppelorgaan naast een rugsteun geleidt; een steunverbindingsdeel dat aan een achterzijde van de veer-continue besturingseenheid is gevormd en dat gericht is vastgemaakt aan een onderuiteinde van een steunplaat met een vooraf bepaalde breedte en uitstreklengte; 10. twee holle buizen die op afstand van elkaar zijn geplaatst en die bij een bovenuiteinde van de steunplaat zijn gevormd; een verbindingsbuis die bij een achterzijde en een massamiddelpuntpositie van de rugsteun is gevormd, waarbij de twee holle buizen horizontaal schrijlings op de verbindingsbuis zitten; 15. twee holle lichamen die respectievelijk langs de holle buizen van de steunplaat zijn ingebracht en in de verbindingsbuis van de rugsteun zijn gepositioneerd; een as die door de twee holle lichamen en de verbindingsbuis van de rugsteun heen steekt en die met een schroefmoer gericht aan een ander uiteinde van de verbindingsbuis van de rugsteun is geschroefd, zodanig dat de rugsteun 20 scharnierbaar is gekoppeld aan de steunplaat; en een torsieveer die een geschikte veerkrachtig heid heeft en die insteekt in naar binnen gerichte zijden van de holle lichamen van de holle buizen van de steunplaat, waarbij de torsieveer een pin heeft die tegen de achterzijde van de rugsteun aan ligt en een andere pin heeft die tegen een achterzijde van de steunplaat aan ligt om met 25 passende veerkrachtigheid tegen de rugsteun aan te liggen; waarbij een zitter op de stoel de veer-continue besturingseenheid met de hand optilt om mogelijk te maken dat de veer-continue besturingseenheid ontgrendelt en in een vrije toestand komt en om daardoor mogelijk te maken dat het rugsteuninstelmechanisme bestuurbaar de rugsteun aandrijft om een richtingsinstelling uit te 30 voeren, zodanig dat de scharnierbaar aan de steunplaat gekoppelde rugsteun, zodra de rugsteun in contact komt met een menselijke rug, onder een gewicht daarvan een vooraf bepaalde richtingsinstelling ondergaat, waarbij, nadat een benodigde rugcontactpositie is bereikt, de zitter de veer-continue besturingseenheid met de hand indrukt om toe te staan dat de veer-continue 35 besturingseenheid terugkeert naar een vergrendelde toestand en dan de scharnier- 1039716 baar aan de steunplaat gekoppelde rugsteun nauwkeurig positioneert, zodanig dat de menselijke rug in stevig contact met de ingestelde rugsteun komt, waarbij, als alternatief, de zitter de veer-continue besturingseenheid met de hand optilt om mogelijk te maken dat de veer-continue besturingseenheid in een vrije 5 toestand komt op een manier dat de rugsteun samen met de menselijke rug een naadloze verplaatsing ondergaat om comfort te verschaffen aan de zitter en de zitter te beschermen tegen lumbago en kyphose, welke veelvoorkomend zijn onder zittende individuen, om niet te noemen dat het rugsteuninstelmechanisme in feite wordt vereenvoudigd en aldus stoelvervaardigingskosten reduceert. 10A back support ramp construction for lumbar support, comprising: a back support adjustment mechanism positioned laterally at a chair; a spring-continuous control unit which is placed at an end of a butterfly-shaped fastening member at a bottom of the chair, the spring-continuous control unit guiding a coupling member next to a back support when performing an unlocking operation or a locking operation; a support connecting part formed on a rear side of the spring-continuous control unit and which is specifically secured to a lower end of a support plate with a predetermined width and extension length; 10. two hollow tubes spaced apart and formed at an upper end of the support plate; a connecting tube formed at a rear and a mass center position of the back support, the two hollow tubes sitting horizontally on the connecting tube; 15. two hollow bodies inserted respectively along the hollow tubes of the support plate and positioned in the connecting tube of the back support; a shaft which projects through the two hollow bodies and the connecting pipe of the back support and which is screwed with a screw nut directed at another end of the connecting pipe of the back support, such that the back support 20 is hingedly coupled to the support plate; and a torsion spring having suitable resilience and protruding into inwardly facing sides of the hollow bodies of the hollow tubes of the support plate, the torsion spring having a pin abutting the rear of the back support and having another pin that rests against a rear side of the support plate for abutting resilience against the back support; a seater on the chair manually lifting the spring-continuous control unit to allow the spring-continuous control unit to unlock and get into a free state and thereby allow the backrest adjusting mechanism to steerably drive the backrest to perform a directional adjustment 30, such that the back support pivotally coupled to the support plate, as soon as the back support comes into contact with a human back, undergoes a predetermined directional adjustment under a weight thereof, wherein, after a required back contact position has been reached, the seater supports the spring-continuous control unit manually pushed to allow the spring-continuous control unit to return to a locked state and then accurately position the backrest pivotally coupled to the support plate such that the human back comes into firm contact with the adjusted backrest, wherein , alternatively, the seater's spring-continuous control lifting unit by hand to allow the spring-continuous control unit to go into a free state in such a way that the back support together with the human back undergoes a seamless displacement to provide comfort to the seat and to protect the seat against lumbago and kyphosis, which are common among seated individuals, not to mention that the back support adjustment mechanism is actually simplified and thus reduces chair manufacturing costs. 10 2. De rugsteunhellingsconstructie voor lumbale ondersteuning van conclusie 1, waarbij het bij de stoel lateraal gepositioneerde rugsteuninstelmechanisme afdek-platen heeft die in vorm daarmee corresponderen en die vanaf de voorzijde en achterzijde tegen de aan de rugsteun gekoppelde steunplaat aan drukken om een 15 onderzijde en de holle buizen van de steunplaat gericht af te dekken met boven- en onderuiteinden van de voorste en achterste afdekplaten en de voorste en achterste afdekplaten met schroevende elementen vast te maken aan vooraf bepaalde posities van de steunplaat, zodanig dat de scharnierbaar aan de rugsteun gekoppelde steunplaat een esthetisch uiterlijk heeft. 2°2. The back support ramp construction for lumbar support of claim 1, wherein the back support adjusting mechanism laterally positioned at the chair has cover plates corresponding in shape and pressing against the support plate coupled to the back support from the front and rear about an underside and the cover hollow tubes of the support plate with top and bottom ends of the front and rear cover plates and fix the front and rear cover plates with screwing elements to predetermined positions of the support plate such that the support plate pivotally connected to the back support has an aesthetic appearance. 2 ° 3. De rugsteunhellingsconstructie voor lumbale ondersteuning van conclusie 1, waarbij het bij de stoel lateraal gepositioneerde rugsteuninstelmechanisme voorste en achterste afdekplaten heeft die vanaf de voorzijde en de achterzijde aan de steunplaat van de rugsteun zijn gekoppeld, en doorgaande gaten heeft die in positie 25 met de verbindingsbuis van de rugsteun corresponderen en de twee holle buizen van de steunplaat zijn gevormd in de voorste afdekplaat om het instellen van beweging tussen de steunplaat en de rugsteun te vergemakkelijken, waarbij bij het onderuiteinde van de achterste afdekplaat een uitgehold gebied is gevormd om mogelijk te maken dat schroevende elementen de steunplaat en het steunverbindingsdeel aan 30 de achterzijde van de veer-continue besturingseenheid aan elkaar vergrendelen wanneer het onderuiteinde van de steunplaat is afgedekt, of het vervolgens verwijderen van de schroevende elementen te vergemakkelijken, waarbij vanaf de onderzijde van de achterste afdekplaat op afstand uit elkaar geplaatste uitstekende delen uitsteken en respectievelijk in openingen van de plaat steken zodra een L- 35 vormige plaat tegen het uitgeholde gebied aan ligt, zodanig dat de achterste afdekplaat een esthetisch uiterlijk heeft. 1039716The back support ramp construction for lumbar support of claim 1, wherein the back support adjusting mechanism laterally positioned at the seat has front and rear cover plates coupled from the front and rear to the back support plate, and has through holes that are in position with the connection tube of the back support and the two hollow tubes of the support plate are formed in the front cover plate to facilitate adjustment of movement between the support plate and the back support, with a hollowed-out area formed at the lower end of the rear cover plate to enable that screw elements lock the support plate and the support connecting part together at the rear of the spring-continuous control unit when the lower end of the support plate is covered, or facilitate subsequent removal of the screw elements, from the bottom of the rear cover allow projecting parts spaced apart from each other and protrude into openings of the plate as soon as an L-shaped plate abuts the hollowed-out area, such that the rear cover plate has an aesthetic appearance. 1039716
NL1039716A 2012-07-04 2012-07-04 Backrest inclination structure for lumbar support. NL1039716C2 (en)

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NL1039716A NL1039716C2 (en) 2012-07-04 2012-07-04 Backrest inclination structure for lumbar support.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084850A (en) * 1975-06-13 1978-04-18 Center For Design Research And Development N.V. Chair
US20060220431A1 (en) * 2005-03-17 2006-10-05 Kwa Ing C Chair control device
KR20110008912A (en) * 2009-07-21 2011-01-27 사연환 A combination apparatus for the back of the chair

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084850A (en) * 1975-06-13 1978-04-18 Center For Design Research And Development N.V. Chair
US20060220431A1 (en) * 2005-03-17 2006-10-05 Kwa Ing C Chair control device
KR20110008912A (en) * 2009-07-21 2011-01-27 사연환 A combination apparatus for the back of the chair

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