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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7431397 | Chair A chair has a seat, a center column, a seat support bar joined to the center column, and a mechanism provided for securing the seat with adjustable inclination to the seat support bar and including a toggle lever assembly. ... | 10/07/2008 |
| 7367622 | Tension adjustment mechanism for a chair A tilt control mechanism for an office chair includes a spring assembly therein which controls the tilt tension on the back assembly. This tilt control mechanism includes a tension adjustment assembly having a cam wedge which supports the legs of a pair of coil spri... | 05/06/2008 |
| 7293832 | Chair adjustable device A chair adjustable device includes a base with which a seat frame and a backrest frame are respectively and pivotably connected. A positioning mechanism is connected to the base and includes an operation handle which is able to shift a transmission frame and a posit... | 11/13/2007 |
| 7066538 | Chair with tilt lock mechanism A tiltable chair is provided with a tilt lock mechanism that can be activated when the chair is at any tilt position, the tilt lock mechanism engaging and locking the chair when the chair moves into the upright, neutral position. ... | 06/27/2006 |
| 7040703 | Health chair a dynamically balanced task chair Healthy task seating is achieved by integrating three dynamics into a unique, dynamically balanced chair design that provides: (a) adaptable design features to accommodate a wide range of body dimensions, (b) a series of independent and adjustable support means to a... | 05/09/2006 |
| 7036882 | Chair, in particular office chair A chair, in particular office chair, comprises a seat support with a front seat support part and a rear seat support part which is pivotable in relation thereto about a horizontal pivoting axis. An adjustable-length energy storing device, which is articulated to the... | 05/02/2006 |
| 7017992 | Chair control device for a tiltable chair A chair control device for a tiltable chair wherein the chair control includes a a one-piece integral structure mainframe housing, including an integral extension for a seat locking cam means, for supporting adjustment mechanisms. The housing is affixed to the under... | 03/28/2006 |
| 6957864 | Chair with a stopping device A chair includes an upper frame disposed above and pivoted to a lower frame. A stopping device includes a slide mounted slidably on the upper frame, and a stopping member. The slide is slidable between a first position, where the stopping member is offset from a rea... | 10/25/2005 |
| 6935689 | Chair The chair comprises an axis X1 that extends right and left and that connects a seat 6 and a supporting body 3 arranged under the seat 6 in a rotatable manner at a front end portion of the seat frame 4, an axis X2 that connec... | 08/30/2005 |
| 6921134 | Apparatus for adjusting inclination of chair backs An apparatus for adjusting the inclination of a chair back is disposed on the chassis at the bottom of a cushion and pivotally coupled to the middle of a base at the upper end of chair legs. A control rod has its middle predetermined position pivotally coupled to th... | 07/26/2005 |
| 6916067 | Angle adjusting mechanism for chair A angle adjusting mechanism for a chair includes a support base, a seat support frame pivotally mounted on the support base, and an adjusting bar mounted between the support base and the seat support frame for adjusting an included angle between the support base and... | 07/12/2005 |
| 6871909 | Locking mechanism for chair and pushbutton control therefor A first chair part may be fixed relative to a second chair part by way of a sliding member attached to the first part which slides in a body attached to the second chair part. The chair parts are fixed relative to each other when a pin associated with the body engag... | 03/29/2005 |
| 6820936 | Chair An office-type chair which provides for synchronous differential tilting of the seat and back assemblies, with the seat assembly being constructed such that the front lip thereof does not significantly lift upon rearward tilting. The chair incorporates a tilt contro... | 11/23/2004 |
| 6619740 | Chair control mechanism A chair control mechanism is adapted to decrease a likelihood of the mechanism becoming unintentionally disengaged from a locked position. In particular, a control arm has locked position wherein a seat plate is restricted in movement relative to a main b... | 09/16/2003 |
| 6588845 | Chair An office-type chair which provides for synchronous differential tilting of the seat and back assemblies, with the seat assembly being constructed such that the front lip thereof does not significantly lift upon rearward tilting. The chair incorporates a ... | 07/08/2003 |
| 6588843 | Chair control A chair control providing both articulating tilt motion and dual-ratio, adjustable, synchronized tilt motion. In a first aspect, the control can be configured as either an articulating tilt control or a synchronized tilt control. In a second aspect, the a... | 07/08/2003 |
| 6488336 | Backrest adjustment device A backrest adjustment device has a hollow base seat, an oblong panel, a guide mount, a slide seat, a nut, a coiled spring, a compression spring, a positioning plate, a top panel, a screw rod, and a control rod. The positioning plate has a threaded apertur... | 12/03/2002 |
| 6419320 | Base manipulation device for office chair A base manipulation device for an office chair includes a bottom plate having locking slots and pivoted with a chair base which has a rotation plate provided with a pivot plate and a drive plate. An operation bar is pivoted on the pivot plate and has a di... | 07/16/2002 |
| 6378943 | Chair tilt lock mechanisms A chair seat tilt lock mechanism has a detent to latch an actuating lever in a locked and unlocked position. When the lever is moved to a locking position, a spring urges a moveable locking member toward a locking position, however, the moveable locking m... | 04/30/2002 |
| 6367876 | Chair A tiltable chair including a housing, a back support pivotally attached to the housing about a first horizontal axis and a seat support pivotally attached to the housing about a second horizontal axis. A leaf spring includes a first end engaging the housi... | 04/09/2002 |
| 6283548 | Office chair with a guidable seat back An office chair is provided. The office chair includes a seat back that can follow the motions of the upper body of a person seated in the seat. The seat back of the office chair includes a restoring spring in the form of a mechanical screw pressure sprin... | 09/04/2001 |
| 6116688 | Chair An office-type chair which provides for synchronous differential tilting of the seat and back assemblies, with the seat assembly being constructed such that the front lip thereof does not significantly lift upon rearward tilting. The chair incorporates a ... | 09/12/2000 |
| 6102477 | Chair with tilt limiter A chair has a control mechanism configured to limit the angle of tilt of the chair back rest relative to the seat. The control mechanism includes a bracket member configured to be supported on a vertical column of a chair base. A rotational member attacha... | 08/15/2000 |
| 6033020 | Rocking apparatus A rocking apparatus has a supported member and a supporting member. The supported member rotatably supported on the supporting member at two distant points on a rotary shaft. The rotary shaft is provided with a reaction force imparting member, which is co... | 03/07/2000 |
| 5997087 | Chair tilt mechanism A chair seat tilt lock comprises a slider riding along a track on the seat and an abutment extending from chair seat post. The slider is spring biased into registration with the abutment to block the chair against tilting and may also be moved away from t... | 12/07/1999 |
| 5772282 | Tilt control mechanism for a chair An apparatus for controlling the tilt range of a chair and the resistance to tilting of the chair including a torsion spring mounted to an axle, a tilt rate adjustment mechanism, a forward tilt limiter and a rearward tilt limiter. The tilt rate adjustment... | 06/30/1998 |
| 5765914 | Chair with a tilt control mechanism A synchronous tilt control mechanism is provided for a chair. The chair includes a base, a seat, a back, a torsion spring, a first slide member and a second slide member. The base further includes a tilt control housing mounted thereon. The back includes ... | 06/16/1998 |
| 5762399 | Inclination positioning device for rocking type chairs A positioning device includes a mounting frame mounted to an underside of a chair seat. The mounting frame includes a positioning portion having a plurality of vertically spaced engaging notches. An adjusting base is mounted to the mounting frame and yet ... | 06/09/1998 |
| 5683139 | Chair seat tilt adjustment and locking mechanism A chair tilt control mechanism for a pedestal base chair having a chair control housing mounted on the pedestal chair base and pivotally supporting a chair seat support member. A laterally movable front stop member retained within the chair control housin... | 11/04/1997 |
| 5203853 | Locking chair tilt mechanism with torsion bar A locking chair tilt mechanism for a chair in which the backrest and rear seat portion tilt rearwardly and downwardly, and the front seat portion of the chair slides generally horizontally is disclosed. The chair is supported by a tilt mechanism mounted b... | 04/20/1993 |
| 5056866 | Rocking chair, particularly office chair construction To provide for a compact seat adjustment mechanism, an elongated seat support (21) is secured to a floor support structure including a central post (13), to extend at an upwardly directed angle of inclination. The seat (17), attached to a seat support (29... | 10/15/1991 |
| 5018787 | Chair seat tilt control A seat support mechanism for a tiltable chair having a rear tilt torque mechanism including interconnected torsion bars which are adjustable to vary the resilient restraining force which opposes rearward tilt of the seat when occupied, a pair of compressi... | 05/28/1991 |
| 4948198 | Knee-tilt chair control A low profile knee-tilt chair control for controlling biased tilting between a chair seat plate and a chair base plate of a pedestal base chair wherein the chair base plate is supported by a single vertical spindle at the rear of the base plate, and the c... | 08/14/1990 |
| 4915449 | Chair with a pivoting seat A chair comprises a base structure, a seat mounted on the base structure for pivoting about a transverse axis, travel limiting means which define the position of maximum rearward pivoting and the position of maximum forward pivoting of the seat, and resil... | 04/10/1990 |
| 4909472 | Pivoting support for chairs, seats and the like A pivoting support for chairs, seats and the like comprises a main support member which is connected to the base structure of the chair and a seat support member which is pivotably connected to the main support member with the interposition of an auxiliar... | 03/20/1990 |
| 4892354 | Chair seat tilt control A seat support mechanism for a tiltable chair having a rear tilt torque mechanism including interconnected torsion bars which are adjustable to vary the resilient restraining force which opposes rearward tilt of the seat when occupied, a detent mechanism ... | 01/09/1990 |
| 4889384 | Knee-action chair control A knee-action chair control for a pedestal chair base comprises a base plate, a seat support plate pivotally mounted on the front of the base plate, a pair of compression springs operable between the plates for biasing the seat support plate toward an at-... | 12/26/1989 |
| 4858993 | Work chair comprising a swivelling seat shell A work or office chair having a seat shell which is pivotably arranged on a height-adjustable seat carrier, characterized by the seat shell being spring loaded to oppose tilting of the seat shell from a raised position towards a tilted, lower position. Th... | 08/22/1989 |
| 4832402 | Adjusting mechanism for a chair A chair, particularly a work chair, includes a mounting plate for fastening a seat and back member. The mounting plate is supported so as to be pivotable with its front end about a horizontally extending axis on a support member which is, in turn, support... | 05/23/1989 |
| 4664445 | Tilting mechanism for a chair seat or the like A tilting mechanism for a chair seat or the like of the kind where said tilting mechanism comprises a rigid metal plate being connected to a chair support via a retaining means and where said chair seat is pivotally connected to said tilting mechanism by ... | 05/12/1987 |
