Abstract: A therapeutic back support device including a back support portion that automatically and repeatedly moves forward to maintain engagement with a user's back as the user moves forward with respect to a chair seat. The back support portion substantially resists backward motion and provides substantially continuous therapeutic support to the user's spine pending a release signal.

Abstract: A seat tilting mechanism comprising a main body, a seat support, a backrest support and an articulation mechanism comprising a lever, a first portion of which defines along with a first arm, the seat support and the main body a first quadrilateral hinge, and a second portion of which defines alone with a second arm, the backrest support and the main body a second quadrilateral hinge. Interior corner angles and lengths of each side of the first and second quadrilateral hinges are such that a predetermined angular displacement ratio of the backrest support in relation to the seat support is provided. An extension resistance device is mounted between the main body and the first portion to provide resistance to rotation of the lever. A first end of the extension resistance device is rotationally mounted to the lever at a first mounting point, which is located between the midpoint and upper point, and is angularly displaced from a line extending between the midpoint and the upper point.

Abstract: A bottom plate structure of a chair has a bottom plate, a back rack and a seat frame. The bottom plate has an elastic support device, a slanting device and an adjusting device. The elastic support device has at least one resilient sheet mounted in the bottom plate, an adjusting component mounted in the bottom plate, and a supporting base connected to the adjusting component. The slanting device has a pivoting component connected to the back rack, a transmission seat mounted in the bottom plate, and two fastening members connected to the bottom plate. The pivoting component has two pivoting arms. The transmission seat has a pulling component connected to the transmission seat. The adjusting device is mounted between the bottom plate and the seat frame, and has a back pivoting component and a front adjusting component mounted on the seat frame and the bottom plate.

Abstract: A tilt mechanism (10) for a chair comprises a base (11), a first support (12) configured to support a chair seat and a second support (13) configured to support a chair back. The second support (13) is pivotably coupled to the base (11). A first coupling mechanism (41) couples the first support (12) with the base (11) and includes a first pin (40) slideably supported in a first linear guide slot (20). A second coupling mechanism (42) couples the second support (13) with the first support (12) and includes a second pin (44) slideably supported in a second linear guide slot (36). When the second support (13) pivots relative to the base (11), the first pin (40) is caused to be displaced along the first linear guide slot (20) and the second pin (44) is caused to be displaced along the second linear guide slot (36).

Abstract: A chair having an adjustable seat pan that can be moved from an angled to a flat position is disclosed. The chair includes a seat frame having a front end and a rear end with a seat back attached to the rear end of the seat frame. A seat articulator that includes a ramp bar that has a first end connected to the seat back and an upper edge with a second end displaced downward from the upper edge is adjacent to the seat frame. The seat pan is pivotally connected to the seat frame and a drop down link is pivotally attached to the seat pan. A cam roller is attached to the drop down link where it is positioned on the upper edge of the ramp bar in contact with the seat pan.

Abstract: A double folding seat for a vehicle may include a stationary bracket, coupled to the seatback frame and to the cushion frame, wherein the recliner bracket is coupled to the one end of the stationary bracket, a link unit elastically installed on the stationary bracket and configured to be selectively coupled to the recliner bracket and transmit a rotating force of the recliner bracket to a latch cam installed to the cushion frame, a stopper fixedly installed on the leg assembly which is connected to a vehicle body, a hinge member rotatably mounted on the cushion frame and rotated by the stopper, and an actuating wire connecting the hinge member and the link unit and displacing the link unit by a rotation force of the hinge member to a position where the link unit cooperates with the recliner bracket when the cushion frame moves backwards to the final position thereof.

Abstract: A chair includes a supporting frame and a seat portion which is foldable about a transverse fold to define a rearward portion behind the transverse fold and a forward portion, forward of the transverse fold. The seat portion is supported above the supporting frame by its rearward portion. The chair also includes a reclinable back portion and a recline mechanism with which the back portion is connected for reclining action of the back portion. The recline mechanism is operably linked to the rearward portion of the seat portion such that on reclining action of the back portion, the rearward portion is moved to increase in rearward tilt angle and to obtain a net increase in height above the supporting frame, with a consequent folding of the seat portion about the transverse fold line under the weight of the occupant.

Abstract: The invention provides a chair-type massage machine comprising a backrest and a seat which can be reclined by a single drive source while permitting the user to hold a relaxed posture. The chair-type massage machine comprises a backrest (20) for the back of the user to bear on, a seat (30) for the user to sit in, and a reclining mechanism (40) for pivotally moving the backrest (20) and the seat (30). The reclining mechanism (40) comprises a single drive source (42), the drive source being coupled to the backrest (20) and the seat (30) by a link assembly (50).

Abstract: A chair includes a supporting frame and a seat portion which is foldable about a transverse fold to define a rearward portion behind the transverse fold and a forward portion, forward of the transverse fold. The seat portion is supported above the supporting frame by its rearward portion. The chair also includes a reclinable back portion and a recline mechanism with which the back portion is connected for reclining action of the back portion. The recline mechanism is operably linked to the rearward portion of the seat portion such that on reclining action of the back portion, the rearward portion is moved to increase in rearward tilt angle and to obtain a net increase in height above the supporting frame, with a consequent folding of the seat portion about the transverse fold line under the weight of the occupant.

Abstract: An item of seating furniture having a seat and a backrest which are supported in an articulated manner on a frame, and having an operating mechanism for adjusting the inclination of the seat and the backrest. The backrest has a catch member and, when the backrest is inclined from a front position into an inclined rear position, the catch member comes into operative contact with the seat as of a specific angle of inclination of the backrest in such a manner that further inclination of the backrest brings about a simultaneous adjustment of the seat. The backrest is adjustable independently of the seat from the front position up to the specific angle of inclination at which the catch member comes into operative contact with the seat.

Abstract: A chair back upright tilts about a pivot axis with respect to a chair seat plate and has a protrusion on the bottom portion thereof. When the occupant of a chair reclines, the protrusion on the back upright and a stop plate make contact with each other. The contact stops the tilting of the back upright. A lever handle, fixedly attached to the stop plate, can be rotated thereby providing more or less tilting of the back upright before contact between the protrusion and the stop plate occurs.

Abstract: The disclosure relates to a method for inclining a chair seat and a chair having an inclinable seat for which maintenance can be easily carried out from outside the attaching frame of a chair, wherein the attaching frame is applicable to leg portions of various kinds of chairs. According to the method and the chair for inclining a backrest side of a seat by causing the backrest to be inclined rearwardly, the structure is such that by rearwardly inclining the backrest attached to a backrest attaching member pivotally supported so as to be inclined rearwardly at one side of an attaching frame opened downward and including a top plate 18 and side plates fixed at the upper end of a leg portion, a tip end protruding part of the backrest attaching member is caused to protrude above the attaching frame and is brought into contact with and pushes up the rear, backrest side of a seat receiving plate which is pressed toward said attaching frame and is inclinably attached to a front end of the attaching frame.

Abstract: A chair includes an L-shaped backrest with a horizontal section engaged with an underside of a seat. An elongated slot is defined in an underside of the horizontal section. A spring assembly includes a knob with a screw extending through the elongated slot and threadedly engaged with the underside of the seat to thereby allow sliding movement of the screw relative to the elongated slot. A leg frame includes two arcuate legs and at least one transverse beam interconnected between the arcuate legs and received in an engaging groove in the seat and secured to two connecting rods, each connecting rod having two ends pivoted to the backrest and the seat, respectively. A a rearward pivotal movement of the backrest relative to the seat causes the seat to move upwardly and forwardly to thereby provide increased safety for the user.

Abstract: A chair seat tilting mechanism comprises a support for mounting to a chair spindle and a lever arm pivotally mounted at a pivot to the support, which lever arm is for mounting to a chair seat. A link arm is pivotally mounted at a pivot to the support and has a cam with a camming end positioned between the lever arm pivot mount and the link arm pivot mount. An extension of the link arm mounts to a chair back such that when a chair occupant leaning back on the chair back, the link arm pivots about the link arm pivot causing the cam to cam lever arm so that it pivots about its own pivot with the support. This results in the chair seat tilting forwardly.

Abstract: A multiple inclination exercise bench having a torso supporting assembly and a seat supporting assembly is disclosed wherein the elevation by a user of the torso supporting assembly causes the elevation of the seat supporting assembly. The invention is characterized as having a torso supporting assembly mechanically linked to a seat supporting assembly. In preferred form, the torso supporting assembly is pivotal at its proximal end about a point associated with the bench and has associated therewith at least one cam plate. A lever or rocker arm is pivotally located adjacent to the cam plate and has a cam follower attached thereto at one end, and a seat support member at the other end. The seat support member supports the distal end of the seat supporting assembly where the proximal end is pivotally located on the bench. A support member is associated with the torso supporting assembly to maintain a desired inclination thereof.

Abstract: The chair can be converted from a state where a person traditionally sits on the approximately horizontal seat (13) of the chair to another state where the person sits on the now inclined seat of the chair, one and the same means being used as back rest in one state and as knee rest in another state. The combined back and knee rest is arranged on one end of a two-armed lever (16) on whose other end there is provided a shaft (18) which is movable in a U-shaped guide (19) in firm connection with the seat. This ensures simple and rapid conversion of the chair between its two states.

Abstract: A seat or chair especially for a flight attendant in an aircraft has a backrest section and a seat section hinged to each other and to a frame in such a way that the backrest section and the seat section can take up different angular positions relative to each other and relative to a vertical frame or to the horizontal. Thus, the chair can be folded to take up several positions including positions in which the seat section takes up lower or higher elevations above the floor. For this purpose the upper end of the back rest section is pivotally guided in a guide mechanism while the lower end of the backrest section is journalled to the rear portion of the seat section at a journal axis which simultaneously forms the journal axis of a support and guide member also hinged to the seat section. The support and guide member is hinged intermediate its ends to the frame through a fixed journal so that the rear edge of the support and guide member can engage a stop in the frame.

Abstract: This invention relates to a chair having a tilting back that tilts rearwardly when the user leans rearwardly and that follows and supports the user's back as he leans forwardly. A lever, swingably mounted to the chair, responds to the specific weight of the user to carry the chair's back forwardly to comfortably support the back of the user without any required adjustment.

Abstract: A contoured seat cover is provided which converts a bench seat assembly of an automative vehicle into a seat containing simulated bucket seats. The seat cover includes a seat back cover and a seat bench cover, both of which include a plurality of separate fabric panels sewn together. The seat back cover has protrusions at the lateral extremities of the seat back which are filled with raised foam cushioning and which form shoulder cradles. At least one raised back position divider divides the seat back into a plurality of occupant back rest positions. Likewise, the seat bench cover includes upwardly projecting occupant posterior position delineating protrusions at its lateral extremities and at least one intermediate divider, filled with foam, which divides the seat cover into occupant posterior support positions that are laterally aligned with the occupant back rest positions of the seat back cover. Forwardly projecting lumbar supports are provided in the lumbar region of each occupant back rest position.

Abstract: A vehicle seat such as an automotive seat is disclosed in which the rearward portion of a cushion frame is attached to a vehicle floor by shaft pins so that the forward portion of the cushion frame can be raised up and lowered down by link members. These link members are attached to a connecting bar for connecting these link members with a back frame. In this vehicle seat, when the back frame is reclined relative to the cushion frame, then the link members are rotated forwardly by the connecting bar so that the forward portion of the cushion frame in engagement with the respective central portions of the link members can be raised up about its pivotally mounted portion in the rearward portion thereof, that is, about the shaft pins.

Abstract: A device for a reclining chair, in which tilting angle of a back of the chair in relation to a seat panel can be adjusted to a suitable position according to requirements and/or choice by expanding and/or contracting operations of a gas-filled spring, when working or studying with the back at substantially upstanding position, the back and the seat panel cooperate together to support a human body in stable, while with the back inclined largely backwards for resting, the seat panel is tilted a little as well as its front edge being raised, so that comfortable sitting postures can be provided at any tilting angle of the back.

Abstract: In a travel seat comprising a backrest, at least one armrest and a seat cushion, there is provided a support plate member which, disposed at the front end of the armrest in a horizontal position is pivotal in its horizontal plane about a vertical axis and, in the position in which it is swung out, is rotatable about a horizontal axis and can be swung in under the armrest.

Abstract: A convertible chair which is adjustable between sitting and reclining positions features a support frame, a seat and a backrest in which the seat and backrest are tiltably mounted so that their relative inclinations can be adjusted to define the afore-mentioned sitting and reclining positions and also a series of intermediate positions. The adjustment mechanism is defined by a support element with a curved support surface which forms a support for the seat and which is pivotably mounted to the support frame at a distance from the pivot axis of the seat and a control linkage which extends between the backrest, or an extension thereof, and the support element so that on changing the inclination of the backrest the support element rotates about its pivot mount and adjusts the vertical height of the point of support of the seat.

Abstract: In a chair with elevated seat surface and footrest, a seat (30, 114), a footrest (38, 162)and a backrest (24) are connected with each other in such a manner that they are swingable jointly from a position suitable for sitting with seat substantially horizontal into a position with strongly forward inclined seat in which the chair can be used as standing rest. The joint swinging is effected by means of a yoke (22; 88, 94; 130, 132, 136, 138) which extends from the footrest to the backrest and consists of a single piece or else can be divided into at least two yoke sections. The seat, the footrest and/or the backrest can be adjustable by separate adjustment devices (46, 50, 60) with respect to the yoke, and in the event of the use of a plurality of divided yoke sections, adjustment devices (98, 140) can be provided in the connection regions of the sections.

Abstract: The dental chair is provided which has pivotally connected back, seat and footrest sections, the seatrest being journaled in turn to a base member. A motor carried by the seat and connected to the backrest provides for articulation of the backrest relative to the seat. A link extending between the back and footrest provides for articulation of the footrest relative to seat and a cam connected between the link and seat provides for articulation of the seat about the base member; all movements being accomplished simultaneously upon operation of the motor.

Abstract: A dental chair which comprises a seat, a back inclinable relative to said seat, first means for effecting inclination of said back, second means for pushing the front portion of said seat upward, and third means operable in response to overinclination of said back beyond the normal inclination thereof to drive said second means so as to raise the front portion of said seat relative to the rear portion thereof.