Chair having an adjustable lumbar mechanism
First Claim
Patent Images
1. A chair comprising:
- a base;
a support arrangement mounted on said base and including a generally vertically oriented back assembly and a generally horizontally oriented seat assembly, said back assembly including a relatively rigid back support member positioned interiorly of the back assembly;
a bracket interconnecting said back and seat assemblies, said bracket having an upper elongated portion which extends generally centrally along at least part of a rear side of said back support member and defines therein a plurality of recesses arranged in a vertical row therealong;
a slide assembly mounted for generally vertical sliding movement along said bracket, said slide assembly mounting thereon a handle, an arm which projects forwardly through an opening defined in said back support member, and a lumbar structure slidably supported on a free terminal end of said arm and positioned adjacent a front side of said back support member for providing support to the lumbar region of the back of the user; and
a plunger mounted on said slide assembly and defining an outwardly protruding nose thereon, said plunger being slidably and linearly movable relative to said bracket in a direction perpendicular to the elongated direction of said upper portion thereof, and said plunger being biased toward said bracket whereby when said handle is manipulated by a user, said nose engages within a selected one of said recesses to adjust the vertical height of said lumbar structure along said back support member.
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Abstract
A chair having a back support arrangement which incorporates therein a height adjustable lumbar mechanism. The lumbar mechanism includes a vertically movable slide assembly which non-positively mounts thereon a lumbar support and a handle for adjusting the vertical position thereof. A detent mechanism is provided which cooperates between the slide assembly and a rigid upright of the chair to enable the adjustment of the height of the lumbar support by the user.
191 Citations
20 Claims
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1. A chair comprising:
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a base;
a support arrangement mounted on said base and including a generally vertically oriented back assembly and a generally horizontally oriented seat assembly, said back assembly including a relatively rigid back support member positioned interiorly of the back assembly;
a bracket interconnecting said back and seat assemblies, said bracket having an upper elongated portion which extends generally centrally along at least part of a rear side of said back support member and defines therein a plurality of recesses arranged in a vertical row therealong;
a slide assembly mounted for generally vertical sliding movement along said bracket, said slide assembly mounting thereon a handle, an arm which projects forwardly through an opening defined in said back support member, and a lumbar structure slidably supported on a free terminal end of said arm and positioned adjacent a front side of said back support member for providing support to the lumbar region of the back of the user; and
a plunger mounted on said slide assembly and defining an outwardly protruding nose thereon, said plunger being slidably and linearly movable relative to said bracket in a direction perpendicular to the elongated direction of said upper portion thereof, and said plunger being biased toward said bracket whereby when said handle is manipulated by a user, said nose engages within a selected one of said recesses to adjust the vertical height of said lumbar structure along said back support member. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A chair comprising:
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a support arrangement including a back assembly and a seat assembly and a rigid structural element interconnecting said assemblies to one another, said back assembly including a rigid back pan for supporting the back of a user and including an outer cover which extends over at least a front side of said back assembly; and
a mechanism for adjusting the contour of said back assembly to suit the user, said mechanism comprising a generally horizontally elongate lumbar support for supporting the lumbar region of the back of the user and a generally upright body member, said body member defining thereon an arm which is cantilevered outwardly therefrom and which slidably seats thereon said lumbar support to position said lumbar support at said front side of said back pan, and a handle which when actuated by a user slides said body member relative to said structural element to adjust the vertical height of said lumbar support, said cover being snugly engaged over said back assembly such that said cover maintains said lumbar support and said body member in engagement with one another without the need for a positive connection therebetween. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A chair comprising:
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a base;
a generally vertically oriented back support and a generally horizontally oriented seat support positioned on said base, said back support incorporating therein a rigid back member defining an opening therein;
a rigid structural element having a first portion connected to said back member and a second portion connected to said seat support;
an adjustable lumbar arrangement associated with said back support, said arrangement including a lumbar support, a slide element disposed adjacent a rear side of said back member and vertically slidably movable relative thereto, and a connector which projects through said opening of said back member and has a terminal end slidably received in a recess defined within said lumbar support so as to interconnect said lumbar support and said slide element and position said lumbar support adjacent a front side of said back member, said slide element having a handle connected thereto for adjusting the vertical height of said lumbar support; and
a detent mechanism cooperating between said structural and slide elements for adjusting the vertical location of said lumbar support to suit the contour of the user'"'"'s back, said detent mechanism including a reciprocating detent part and a biasing member each supported on one said element and a plurality of notches arranged in a generally vertical row along the other said element, said biasing member exerting a force on said detent part to urge same into engagement with a selected one of said notches. - View Dependent Claims (17, 18, 19, 20)
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Specification