Tilt back chair and control
First Claim
1. A chair control for a chair having a tiltable seat and a tiltable back supported on a substantially vertical pedestal, said control comprising:
- a plurality of supports, including a base support, a movable back support, a movable seat support and a movable interconnection support,said base support having a forward portion corresponding to the front portion of a seat to be mounted thereon and a rear portion where a chair back is to be disposed and means for mounting said base support on such a pedestal in a predetermined orientation to horizontal,said movable back support being mounted on at least one other of said supports for pivotal movement about a generally horizontal transverse first pivot axis located forward of said mounting means, whereby said first pivot axis is disposed approximately beneath the location of the hip joint of a user when in a normal seated position on such chair, said back support including a rear portion for providing vertical support of a chair back,said movable seat support being mounted on at least one other of said supports for pivotal movement relative to said base support about a second generally horizontal transverse pivot axis, said movable seat support having a rear portion, andsaid movable interconnection support being mounted on said base support for pivotal movement about a generally horizontal transverse third pivot axis, said interconnection support supportably engaging said back support and said seat support and thereby effecting simultaneous coordinated angular pivotal movement of said back support and said seat support about their respective pivot axes, such engagement of said interconnection support with said back support being spaced from said first and third axes and said engagement of said interconnection support with said seat support being spaced from said second and third axes such that said angular movement of said back support significantly exceeds said angular movement of said seat support and the concomitant vertical movement of said rear portion of said back support during such angular movement substantially exceeds the vertical movement of the rear portion of a seat on said seat support during such angular movement; and
a spring mounted on said supports and engaging at least one of said movable back support, said movable seat support and said movable interconnection support at a location spaced from the respective pivot axis of said one of said movable supports and thereby biasing said movable back and seat supports to the upright seating position of a back and seat when attached thereto.
3 Assignments
0 Petitions
Accused Products
Abstract
A tiltable chair has a base, a vertical post, a seat, a back and a chair control. The chair control comprises a housing attached to the vertical post, a resilient biasing means mounted in the stationary housing for biasing the chair in an upright position, a seat support structure, a back support structure and a back frame member. The seat support structure is pivotally connected to the housing at a pivot axis aligned over the vertical post. The back support structure is pivotally connected to the seat support structure at an axis forward of the vertical post. One end of the back frame member supports the back support structure while a mid-portion is interconnected to the seat support structure and the opposite end is pivotally attached to the housing to provide both differential tilting of the seat and back and correlated differential vertical movement for ergonomic comfort and to avoid "shirt pull." A spring mount assembly comprising compression springs compressed between the front portion of the seat and the seat support structure provides resilient but flexible seat support. A base cover assembly comprises top and bottom fairings which form a friction fit with the base and which also snap fit together to provide a smooth, attractive appearance.
82 Citations
31 Claims
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1. A chair control for a chair having a tiltable seat and a tiltable back supported on a substantially vertical pedestal, said control comprising:
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a plurality of supports, including a base support, a movable back support, a movable seat support and a movable interconnection support, said base support having a forward portion corresponding to the front portion of a seat to be mounted thereon and a rear portion where a chair back is to be disposed and means for mounting said base support on such a pedestal in a predetermined orientation to horizontal, said movable back support being mounted on at least one other of said supports for pivotal movement about a generally horizontal transverse first pivot axis located forward of said mounting means, whereby said first pivot axis is disposed approximately beneath the location of the hip joint of a user when in a normal seated position on such chair, said back support including a rear portion for providing vertical support of a chair back, said movable seat support being mounted on at least one other of said supports for pivotal movement relative to said base support about a second generally horizontal transverse pivot axis, said movable seat support having a rear portion, and said movable interconnection support being mounted on said base support for pivotal movement about a generally horizontal transverse third pivot axis, said interconnection support supportably engaging said back support and said seat support and thereby effecting simultaneous coordinated angular pivotal movement of said back support and said seat support about their respective pivot axes, such engagement of said interconnection support with said back support being spaced from said first and third axes and said engagement of said interconnection support with said seat support being spaced from said second and third axes such that said angular movement of said back support significantly exceeds said angular movement of said seat support and the concomitant vertical movement of said rear portion of said back support during such angular movement substantially exceeds the vertical movement of the rear portion of a seat on said seat support during such angular movement; and a spring mounted on said supports and engaging at least one of said movable back support, said movable seat support and said movable interconnection support at a location spaced from the respective pivot axis of said one of said movable supports and thereby biasing said movable back and seat supports to the upright seating position of a back and seat when attached thereto. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A chair control for a chair having tiltable seat and a tiltable back supported on a substantially vertical pedestal, said control comprising:
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a plurality of supports, including a base support, a movable back support, a movable seat support and a movable interconnection support, said base support having a forward portion corresponding to the front portion of a seat to be mounted thereon and a rear portion where a chair back is to be disposed and means for mounting said base support on such a pedestal in a predetermined orientation to horizontal, said movable back support being mounted on at least one other of said supports for pivotal movement about a first generally horizontal transverse pivot axis located forward of said mounting means, whereby said first pivot axis is disposed approximately beneath the location of the hip joint of a user when in a normal seated position on such chair, said back support extending rearward from said first pivot axis and including a rear portion for providing vertical support of a chair back, said movable seat support being mounted on at least one other of said supports for pivotal movement about a generally horizontal transverse second pivot axis, said movable seat support extending rearward from said second pivot axis and having a rear portion, and said further movable support being pivotally mounted on said base support and supportably engaging a first engagement portion of said movable back support and a second engagement portion of said movable seat support, said first engagement portion being spaced from said first axis a distance which substantially exceeds the spacing of said second engagement portion from said second pivot axis, whereby movement of said further movable support effects simultaneous coordinated pivotal movement of said back support and said seat support about their respective pivot axes such that the angular movement of said back support significantly exceeds the angular movement of said seat support and the concomitant vertical movement of said rear portion of said back support during such angular movement substantially exceeds the vertical movement of the rear portion of a seat on said seat support during such angular movement; and a resilient biasing member mounted on said supports and engaging one of said movable back support, said movable seat support and said movable interconnection support at a location spaced from the respective pivot axis of said one of said movable supports and thereby biasing said further movable support and said back support and seat support to the upright seating position of a back and seat when attached thereto. - View Dependent Claims (8, 9, 10, 11, 12)
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13. In a tiltable chair having a base, a vertical pedestal supported by the base, a chair seat having a rear portion and a front portion, and a chair back, a chair control comprising:
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a housing attached to said vertical pedestal in a predetermined orientation to horizontal; a seat support structure connected to and supporting said chair seat, said seat support structure pivotally mounted on said housing for pivotal movement about a first generally horizontal transverse axis disposed over said vertical pedestal; a back support structure connected to and supporting said chair back, said back support structure pivotally mounted on one of said housing and said seat support structure for pivotal movement about a second generally horizontal transverse axis located forward of said vertical pedestal; a back frame member having one end portion supportably engaging said back support structure at a point spaced from said first axis, a mid-portion supportably engaging said seat support structure at a point spaced from said second axis and the other end pivotally attached to said housing for pivotal movement about a third generally horizontal transverse axis; and a resilient biasing means mounted in said housing for biasing said seat support structure, said back support structure and said back frame member to position said chair in an upright position. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A chair control for a chair having a tiltable seat and a tiltable back supported on a substantially vertical pedestal, said control comprising:
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a plurality of supports, including a base support, a movable back support, a movable seat support and a movable interconnection support, said base support having a forward portion corresponding to the front portion of a seat to be mounted thereon and a rear portion where a chair back is to be disposed and means for mounting said base support on such a pedestal in a predetermined orientation to horizontal, said movable back support being mounted on at least one other of said supports for pivotal movement about a generally horizontal transverse first pivot axis located forward of said mounting means, whereby said first pivot axis is disposed approximately beneath the location of the hip joint of a user when in a normal seated position on such chair, said back support including a rear portion for providing vertical support of a chair back, said movable seat support being mounted on at least one other of said supports for pivotal movement about a generally horizontal transverse second pivot axis, said movable seat support having a rear portion, and said movable interconnection support being mounted on said base support for pivotal movement about a generally horizontal transverse third axis, said interconnection support supportably engaging said back support at a first distance from said third axis and engaging said seat support at a second distance from said third axis which is substantially less than said first distance and effecting simultaneous coordinated pivotal movement of said back support and said seat support about their respective pivot axes such that the angular movement of said back support significantly exceeds the angular movement of said seat support and the concomitant vertical movement of said rear portion of said back support during such angular movement substantially exceeds the vertical movement of the rear portion of a seat on said seat portion during such angular movement; and yieldable biasing means mounted on said supports and engaging at least one of said movable back support, said movable seat support and said movable interconnection support at a location spaced from the respective pivot axis of said one of said movable supports and thereby biasing said movable supports to the upright position of a back and seat when attached thereto. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification