Abstract: A dental patient's chair which is fully and completely adjustable which includes a foot control system that eliminates the need to manipulate any hand-operated control knobs or levers. The dental patient's chair includes a linkage assembly which allows the seat to pivot and move in the same manner as the human body when the human body articulates about the complex pivot created at the pelvic bone, the upper legs, and the lower part of the backbone. The dental patient's chair allows the patient's body to remain in the same position relative to the backrest and the seat of the patient's chair as the chair is articulated in a variety of positions.

Abstract: According to a method for inclining a chair seat, and a chair having an inclinable seat, blood circulation is improved by making the structure of the chair simple and of such a structure as to cause elongating of the backbone of a person being seated, and dissipating of the pressure at the rear side of the femoral region in the vicinity of the knees. In this chair, a backrest attaching member is pivotally supported at the rear side of an attaching frame for rearward inclination, and at the same time is spring-pressed toward the attaching frame. A push-up member is vertically attached to a horizontal portion of the backrest attaching member. A seat receiving plate is pivotally supported at the front side of the attaching frame for upward inclination, and the seat receiving plate is engaged with an upper end of the push-up member. A backrest is attached to the backrest attaching member, and a seat is attached to the seat receiving plate.

Abstract: An ergonomic self-balancing armchair having a seating element, a holding support and a mechanism for regulating the angular position of the seating element. The regulating mechanism has an articulated triangle structure, in which the angular ends define free turning spindles. One side of said triangle defines a fixed length and fixed position, and a second side defines fixed length and tilting position, and a third side defines variable length and tilting position. The seating element is supported and fixed upon the second and third sides, whereas through the first side is assembled the supporting mechanism. The spindle is made up of the torsion bar that is mounted so that it turns freely upon side and has fitted at one end side and the opposite end a regulating control lever.

Abstract: An adjustment mechanism for a chair that adjusts the angle of inclination of both the seat and back portions simultaneously to adopt the best relative ergonomic positions. The adjustment mechanism comprises a mounting means for connection to a chair support column and a first frame member for supporting the seat portion that is pivotally mounted to the mounting means. A second frame member for supporting the back portion of a chair is pivotally mounted to the first frame member. A control member is pivotally mounted at a first end to the second frame member, and has a slot that engages a bar that is fixed to the first frame member. Locking means associated with the bar releasably locks the control member with respect to the bar. A link is pivotally attached at one end to the second end of the control member and is pivotally attached at the other end to the mounting means. The control member is held by the link so that the angle of the slot to the horizontal is maintained.

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: A seat assembly for a vehicle which includes a seat, a seat back, and mounting means mounting the seat for movement in fore and aft directions in the vehicle along an upwardly concaved arcuate path. The arcuate path has a radius of curvature which is sufficiently large to timely move in front of and to contain the person's buttocks, to significantly slow the rate of deceleration of the person seated on said seat, and being sufficiently small to convert a portion of the linear momentum of the person's buttocks to angular momentum thus maintaining frictional contact of the person's buttocks with the seat during stopping at a high rate of deceleration. A seat assembly which includes a lower lumbar support member that is coupled from movement in response to pelvic tilting movement of the seat also is shown.

Abstract: An ergonomical chair is provided, of the type which is adjustable in height, whose seat has a front portion with a slope automatically changeable as a function of the height adjustment. The seat rear portion remains substantially horizontal, irrespective of the height adjustment and the consequent tilting of the front portion, thus avoiding the downward sliding of the body which can stay in its erect or slightly backward bent position, while a correct leaning of the seat front portion of the lower region of the thighs is ensured without exerting any tiring action by the user. Another embodiment of the invention has armrests and backrest adjustable integrally with each other.

Abstract: A chair or the like with an undercarriage, having a seat surface that is attached in a resilient manner to the undercarriage and a backrest that is connected in a resilient manner to the seat surface, wherein to assure a flexible and individual conformity of the chair or the like to the body placing a load on it. A plurality of flexible strips are disposed next to one another and attached in their end area in a nearly horizontal orientation to the undercarriage which act as a seat surface, and wherein a plurality of strips disposed next to each other in a nearly perpendicular orientation act as a backrest and are connected with their one end area to a strip and with their other end to the seat surface.

Abstract: The vehicle front seat comprises a seat proper (12) mounted on a base (10) by means of two oblique rods (14 and 15) and a back (13) pivotally mounted firstly about an inclination adjusting axis (6) and secondly about an axis (7) for folding the back down forwards, which axis is secured to the base. The bottom axis (4) of the front rod is connected to an axis (5) secured to the base via the short side (16) of a rigid triangle (T), a long rod (20) is pivotally mounted firstly about an axle (8) secured to the triangle and secondly about an axis (9) secured to the back, and a fourth rod (19) interconnects the two hinge axes (6 and 7) of the back.

Abstract: A reclining chair which includes a pivotal connection between the seat support, the arm support and the back support. The connection allows for the seat support to be raised during reclining operation to allow a user to maintain a consistent eye level at all times. The pivotal connection includes links which are pivotally connected at the sides of the chair to their corresponding supports and are actuated by the weight of the user.

Abstract: The chair includes a movable seat and back that are configured to enhance the patient's comfort by providing lumbar support when the chair is in the recumbent position and by minimizing patient sliding within a moving chair. Chair movement is controlled by a microprocessor-based control system that includes sensing mechanisms for precisely monitoring the chair position. The sensing mechanisms are employed in conjunction with a memory device to permit the user to define a particular position into which the chair will move any time the appropriate switch is closed by the user. The chair control system diagnoses malfunctioning chair components and generates and displays data indicating the particular malfunctioning component.

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: The chair includes a movable seat and back that are configured to enhance the patient's comfort by providing lumbar support when the chair is in the recumbent position and by minimizing patient sliding within a moving chair. Chair movement is controlled by a microprocessor-based control system that includes sensing mechanisms for precisely monitoring the chair position. The sensing mechanisms are employed in conjunction with a memory device to permit the user to define a particular position into which the chair will move any time the appropriate switch is closed by the user. The chair control system diagnoses malfunctioning chair components and generates and displays data indicating the particular malfunctioning component.

Abstract: The chair includes a movable seat and back that are configured to enhance the patient's comfort by providing lumbar support when the chair is in the recumbent position and by minimizing patient sliding within a moving chair. Chair movement is controlled by a microprocessor-based control system that includes sensing mechanisms for precisely monitoring the chair position. The sensing mechanisms are employed in conjunction with a memory device to permit the user to define a particular position into which the chair will move any time the appropriate switch is closed by the user. The chair control system diagnoses malfunctioning chair components and generates and displays data indicating the particular malfunctioning component.

Abstract: A chair having a seating unit and two pairs of legs made slidably integral by couplings attached to the seating unit and designed to engage the relevant inserts located in such first pair of legs, which are made to slide in relation to the second pair of legs by further couplings located in further inserts provided on the second pair of legs, so as the couplings are designed to allow substantially continuous tilt adjustment of the seat and of the backrest relative to the seat, as a result of the relevant pushing action exerted by the user while assuming various positions that are balanced by the push up action.

Abstract: A reclining chair has a seat back and a seat bottom which are pivotally attached to opposite ends of a rocking cradle or support frame, which itself is pivotally mounted to a base. The seat back and the seat bottom are interconnected such that an end of the seat bottom proximate to the seat back is raised as the seat back is lowered. Conversely, as the end of the seat bottom proximate to the seat back is lowered, the seat back is raised. The opposite or remote end of the seat bottom is maintained at substantially the same elevation as the end of the seat bottom proximate the seat back, whereby the seat bottom is maintained in a substantially constant orientation relative to the horizontal as it is raised and lowered.

Abstract: A chair, in particular an office chair, including a seat and a back rest which are pivotal in relationship to a supporting column supporting these. The back rest is mounted on a carrier for pivotal movement about a fixed first horizontal axis. A downwardly directed first control means is mounted on the carrier for pivotal movement about a second axis which is located in front of the first axis. The lower area of the first control means is mounted for pivotal movement about a third axis at the lower end of a second control means. The second control means extends upwardly to the front area of the seat and there is connected for pivotal movement about a fourth axis. The carrier is connected at a fifth horizontal axis located below the second axis on the carrier to a substantially horizontal third control means, the other end of which third control means is pivotally coupled connected for pivotal movement about a sixth axis, lying above the third axis, with the second control means.

Abstract: A chair with an automatic adjustment feature includes a seat coupled by engaging links to a plurality of support arms for relative pivoting and translational movement with respect to such arms. The seat has an upwardly extending rear extension connected to the back rest by an adjusting element. A pivot lever is disposed at either side of the seat, each lever having a first end pivotably pinned to a support arm, a second end attached to the back rest and a hinge pin disposed intermediate such ends and coupling the pivot lever to the seat. The element is of the self-adjusting type for permitting relative linear movement between the rear extension and the back rest while yet preventing bending movement between such extension and such back rest. The positional relationship of the rear extension and the back rest to one another is automatically adjusted as the chair is moved between an upright position and a reclining position.

Abstract: A chair, especially an office chair, has a base and a seat disposed thereon as well as a backrest. The seat and the backrest are supported such that they can be pivoted about horizontal axes in a coordinated manner, and at least one gas spring is provided for damping the pivoting movement and for attaining a restoring action.

Abstract: A chair includes a compact backrest linkage mechanism for enabling the chair backrest and seat to tilt. The linkage mechanism comprises a pair of backrest levers pivotally connected to respective chair frame members near the chair back legs. A seat lever is pivotally connected to each chair frame member near the front legs. The backrest lever and seat lever pivotally connected to each chair frame member are connected to each other by an anti-friction sliding joint. Springs acting between the seat levers and chair frame members bias the seat levers and backrest levers to a normal configuration where the seat levers and backrest levers are positively located. A person sitting in the chair can tilt the backrest and simultaneously pivot the seat in only one direction from the normal configuration, that direction being to tilt the backrest backwardly and to raise the back end of the seat.

Abstract: The invention relates to a seat assembly for an office chair or the like, having a seat and back (6, 7) which are adjustable especially by shifting the body and having a cradle (5). The seat and the back are hinged together at their adjoining ends by at least a first articulation (8) and have, at points distanced from the articulation (8), bearing elements (13, 14) which are suspended or guided on the cradle by positive guiding means (10, 11) and are mounted for movement along paths established by the positive guiding means. The articulation (8) is free-floating. The bearing elements (13, 14) are guided by the positive guides (10, 11) independently of one another.

Abstract: A chair has a spring rocker which is articulatad to a seat support at a front edge of the seat. The rocker is connected to a pelvis-hip support by a horizontal pivot device. An entrance section of the pelvis-hip support is longer than an exit section thereof. Synchronizing levers connect the seat support and the pelvis-hip support in such a way that pivoting of the seat results in a relatively greater pivoting of the pelvis-hip support. A backrest is pivotably connected to the exit section of the pelvis-hip support toward the rear against the force of a spring by movement of the body of a seated person. This permits the shell elements of the shell contour of the chair to conform better to the course of movement executed by the body, of the seated person, and to give support throughout the pelvis-hip region of the body of the seated person.

Abstract: A sitting device, adapted to be used in two different sitting postures comprising a main frame, a seat pivotally mounted on said main frame and a separate knee support, which is pivotally mounted in one end each of a pair of supporting arms, which have their other ends pivotally mounted in links of a link system, said links being arranged in pairs and attached to the frame of the sitting device pivotable in a vertical plane, one pair of the links being prolonged by an arm, which extends between the frame and the seat.

Abstract: A reclining chair is provided comprising a seat (2) comprised of a rigid supporting shell (7), a back rest (3) freely displaceable in orientation in relation to said seat (2), a rigid seat support (18,9) including at a forward end of the seat a stationary pivot axis (8) where said rigid supporting shell (7) is attached to said rigid seat support (18,9) and about which pivot axis said seat can pivot rearwardly into a reclining position, at least one back stay bar (11), one end (12) of said back stay bar being fixed to said seat support (18,9), and an opposing end (16) of said back stay bar being connected to said back rest (3), and said seat shell (7) including a slide bearing (20), a portion of said back stay (11) being slidably supported on said slide bearing (20), said slide bearing providing positive guidance between the seat shell and the back stay such that when said seat shell reclines over an angle .beta. the back rest reclines over an angle .alpha. which is substantially greater than angle .beta..

Abstract: The chair is provided with a seat connected to a support structure of the chair by means of one or more hinged parallelograms consisting of pairs of tie-rods hinged to the seat and to the support structure. The structure of the chair backrest is integral with at least one of the tie-rods so as to allow the seat to be raised when the backrest is pushed backwards. Provision is also made for elastic means which are designed to counteract the backwards movement of the backrest.

Abstract: Chair comprising a support element, a seat and a backrest, the seat consisting of a foremost portion being rigidly connected to the support element and of a rear portion being pivotally connected to the support element and being supported by an arm at some distance from its pivot, said arm being positioned beneath the seat and carrying the backrest. Said arm being pivotally connected to the support element and being biased by a progressively acting spring member towards the position which the rear seat portion and the backrest are occupying in the unloaded state.

Abstract: A chair, particularly an office chair, has a vertically adjustable seat carrying means at which, by means of a control linkage, a seat plate that can be adjusted in its slope is coupled as well as a backrest are coupled. The backrest adjusts itself as a function of the slope of the seat plate. The control linkage comprises coupling elements that are held at the seat carrying means and are arranged in the shape of scissors and are coupled to seat parts of a seat surface that are flexibly connected with one another. By means of this coupling, an imaginary axis of rotation in the knee area is formed that is transversely extending and unchangeable and is located in front of the seat surface. This axis of rotation in the knee area is located in an intersecting line that is formed between a horizontal plane of the seat surface when in a basic adjusted position and a diagonal plane of one coupling element when in an inclined adjusted position.

Abstract: A chair has a seat connected to the seat support (1) by means of a front guide rod (11). The seat includes front and rear seat portion (8) hinged to each other. The rear seat portion (8) is secured to the seat support (1) by means of a rigidly connected downwardly extending element to which one end of a second guide rod (16) is hinged by a bearing (17). The other end of the second guide rod is connected by another bearing (15) to a section (14) of the back rest support (3). The back rest support is hinged at the seat support (1). A force storage member (13) is connected by joints to both the seat support (1) and to the seat.

Abstract: To permit backward rocking of the back or back-and-seat of a chair, independently of the previously tilted-back position of the chair, a comfort position memory structure is provided which includes a manually adjustable variable stop structure formed by a cam curve (37) with a serrated or toothed surface, engaged by a stop element (41) coupled to the seat (17, 19). The cam (37) is manually rotatable, by being secured to an externally user-accessible adjustment segment (45). To set a predetermined tilted position, the user tilts back on the chair, and then permits the chair to tilt forward to a comfortable position, and then rotates the manually engageable segment (45) until a tooth (39) of the cam disk (37) is engaged by the stop (41). A spring (32) biasses the chair forwardly and against the stop, unless tilted back by the user.

Abstract: A chair with a seat support (7) has a seat plate (11) which is supported to the seat support (7) by means of a rear and a front guide rod. The chair has a back rest support (14a) that is pivot-hinged to the seat support (7). The seat support (7) is connected to a rigid, back rest angle support (1) by means of a front and a back parallelogram guide rod (3). The angle support is fixed to the bottom part of the chair (2). The parallelogram guide joints (3) are also connected to each other by means of a parallel guide rod (4). A first force storage member (5) is situated between the seat support (7) and the back rest angle support (1) and a second force storage member (15) is located between the back rest support (14a) and the seat support (7). The force necessary for the slope of the back rest is independent of the weight of the user. A user with higher weight must expend a higher amount of force for the slope of the back rest to move backward than a user with a lower weight.

Abstract: An inclined seat indicating device for a baby carriage is part of a seat support member of the baby carriage. The angle of inclination of the seat support member is adjustable relative to a fixed member which is fixed in a position so that the seat support member overlaps the fixed member. Either the seat support member or the fixed member is provided with a mark device for distinguishing the inclined state of the seat support relative to the fixed member. The respective other member is provided with a window through which the relative position may be observed.

Abstract: A seat such as an office chair comprises a seat carrier assembly carrying an adjustable seat portion and also an adjustable backrest portion. The inclination of the backrest portion can be adjusted by means of a first gas spring unit while inclination of the seat portion is adjusted by means of at least one and preferably two second gas spring units. An actuating lever is operatively connected to the valve actuating members of the respective gas spring units and is pivotable about a pivot point in first and second directions, the second direction being at least substantially perpendicular to the first direction.

Abstract: A chair that converts from a conventional seat and back rest type of chair to a seat and knee rest type of chair utilizes a seat that is pivotally connected to a base support that, when pivoted, is rotated from a generally horizontal plane when used as a conventional chair, to a predetermined angle of tilt. The back rest is also pivotally connected to the base support by a bracket arm that permits the back-knee rest to be moved from a position above the plane of the seat, to support the back of a person sitting on the horizontally positioned seat, to a position below the plane of the seat and at a predetermined angle of tilt to support the knees of a person sitting on the tilted seat.

Abstract: A reclining chair (10) having a seat (12), backrest (14), side supports (16) and a reclining mechanism which includes a backrest bracket (34) rigidly affixed to the backrest (14) and pivotably mounted to a side support bracket (18), the side support bracket (18) being rigidly affixed to a side support (16). A seat support bracket (30) is rigidly affixed to the seat (12) and pivotably mounted to a side support bracket (18). A coupler link (40) has one end pivotably connected to the backrest bracket (34) and a second end pivotably connected to the seat support bracket (30). The axis of rotation of the backrest (14) is located so as to pass approximately through the hips of a chair occupant. Further, the linkages are so selected and arranged that the reclining motion and return motion take place by a horizontal translation of the center of gravity of the occupant to minimize the effort required to operate the reclining mechanism through its range of movement.

Abstract: The work chair has a seat squab and a backrest which both pivot on a seat carrier in the same direction interdependently. A load element is fitted to the seat carrier which is adjustable over its linear extension by means of a locking mechanism, whereby the load element pivots the seat squab and backrest into position of rest under spring loading.To achieve a relatively large and symmetric spring loading in the smallest space it is foreseen that the load element should consist of two parallel compression springs in between which a hydraulic locking mechanism is fitted whereby one end of the load element is connected by a pivot to the free pivoting part of a lever arm, which forms the backrest-carrying part.

Abstract: An adjustable office chair (10) comprises a base assembly (12), a seat assembly (14) and a backrest assembly (16). The seat assembly (14) is horizontally rotatable on the base assembly (12) and is raised and lowered thereon by a manually controlled pneumatic actuator (24) connected between the base and seat assemblies (12, 14). The seat assembly (14) comprises a lower seat frame (50) which is mounted on the piston rod (28) of the pneumatic actuator (24) for horizontal rotation and an upper seat frame (52) which is mounted for vertical pivotal movement on the lower seat frame (50). A seat pan (54) is movably mounted on the upper seat frame (52) and is manually movable to selected attitudes wherein it is automatically releasably latched by a mechanism (56).

Abstract: A rocker-recliner chair utilizing but two mounting links for mounting the seat and backrest to the rocker cams and which mounting links are also utilized to position the chair in advanced reclining positions beyond the TV position. The chair is biased to the TV position wherein the footrest is extended, by the weight of the chair occupant acting through the rear mounting link. However, the chair is retained in upright position against the gravity basis by a spring-loaded lock mechanism which is actuated by a handle to release the lock mechanism to allow the occupant's weight to drive the chair to TV position. When moving to TV position, the seat undergoes a certain amount of rearward displacement relative to the rocking cams to position the weight of the occupant to the rear while a "landing gear" stop descends to engage the base to thus prevent rearward rocking of the chair.

Abstract: A reclining and swingable chair comprising a front leg having a first U-shaped member; a rising rod provided at the upper portion of the first U-shaped member; a first reinforcing member provided at lower end of the rising rod; a supporting rod provided at the front lower end of the first U-shaped member and projected forwardly and upwardly; a pair of connecting rods respectively provided at the rear lower end of the first U-shaped member; a rear leg having a second U-shaped member; a second reinforcing member provided at the upper portion of the second U-shaped member; a holder provided at the lower end of the second U-shaped member for holding the connecting rod for thereby allowing the front and rear legs to be crossed with each other; and a seat cloth stretched between the first and second reinforcing rods. The reclining and swingable chair further includes a back support rod pivotally supported on the rising rods and a leg supporter connected with front tip ends of the rear leg via a ratchet.

Abstract: The structure (1) supporting the body on the seat is subdivided into a front seating part (2) articulated on the frame (5), a back (4) articulated on a bracket (10) which is itself articulated on the frame, and a rear seating part (3) articulated between the back (4) and the front seating part (3). A non-rigid connection (14) is provided between the rear seating part (3) and the bracket (10).

Abstract: To simplify the construction of a tilting chair, typically a desk chair, in which the seat (2) and chair back (7) tilt together, the chair back (4) has an extension or attachment arm (5) extending from the lower region thereof to a zone adjacent or beneath the seat (2), and a pivot positioned at, or below the seat pivotably connects the attachment arm (5) to the seat, so that the pivotable attachment of chair back and seat is placed close to the hip joint of a user of the chair. The attachment arm has an extending portion (5') which is connected by a guide element, in the form of a double-link lever (10') or a guide slit (10) to the support structure (2), the guide means being connected to the attachment arm, for example by a cross bolt (9) which, preferably, also serves as one attachment pivot of a positioning and force spring (7), preferably a gas spring which is pivotably connected (8) at its other end to the support structure (1).

Abstract: A reclinable seat for use in vehicles provides two systems enabling an occupant to adopt reclining postures. The seat comprises a bottom part and a back support part which are rotatable together about an axis in a support frame to be fixed in the vehicle. The axis is transverse to the seat and is adjacent to the bottom part, enabling the seat to be rotated bodily about the axis into reclining positions. The back support part is pivoted to the bottom part so that it can be tilted separately into reclining positions. Separate piston/cylinder control assemblies are provided for respectively locating the seat in positions angularly spaced about the axis and for locating the back support part in angularly spaced positions relative to the bottom part.

Abstract: A chair tilt mechanism (100) includes a support casting (110) mounted to a chair spindle (104) and a seat casting (130) having a chair seat (102) mounted thereon. A pair of elongated forward links (150) and a pair of triangular shaped rear links (160) are pivotably connected to both the seat casting (130) and support casting (110). A slidably mounted spring yoke (210) includes a front vertical portion (212) interconnected between rearwardly extending arms (214) which are pivotably connected to the rear links (160). As the seat casting (130) is tilted, the links (160) pivot away from an initially biased position and the spring yoke (210) compresses a coiled outer spring (200). A concentric coiled inner spring (202) is provided to increase the spring rate in the event that the outer spring (200) is compressed a certain degree. In a second embodiment, the springs are compressed by the movement of the front links rather than the rear links.

Abstract: The present invention relates to an adjustable swivel chair with a pivoting angular holder for the backrest. The angular holder for the backrest is provided into an upper portion and an offset arm so as to allow for the articulated movement of the parts with respect to one another. The offset arm extends under the seating surface while the upper portion provides a support for the backrest. Adjustment means are provided in the form of frictional engagement of lamellar packs and the clamping thereof by means of a clamping adjustment device which may be released so as to position the movable elements with respect to one another. The assembly is mounted on a support post and the upper external portion of the support element defines the seat portion of the swivel chair.

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: A chair has a seat frame that is suspended at its rear by swing links which are pivoted to the chair frame on a horizontal axis located above the level of the seat frame and a back frame which is mounted on the swing links and pivots with them about the horizontal axis to be reclined to a large angle. The front of the seat frame is supported by swing links which extend downwardly to pivot on the chair frame and define a front horizontal pivot axis for the seat frame which is located below it. Counterbalance springs are connected between them and the chair frame to provide resistance to recline of the back frame and assistance in its return to an upright position. Linkage between the end of each spring and the adjacent swing link controls extension of the spring to keep it always tight and to apply the most advantageous degree of spring force.

Abstract: The invention is concerned with assistance to handicapped persons. The body-supporting device for wheelchair for handicapped person is characterized in that it comprises: a first set of means comprising two rigid segments, each mounted on the backrest by an articulated system which blocks the segment in a vertical orientation as armrest or horizontal orientation as thoracic half-belt, and a second set of means comprising two cradel elements adapted to be immobilized in the same horizontal plane in alignment to form open leg guards fitting over the front of the subject's legs. The invention is applicable to wheelchairs.

Abstract: An office chair includes a seat portion pivotable about one horizontal axis relative to a vertical stand and a back rest portion pivotable about another horizontal axis relative to the vertical stand of the chair, upon the application of the weight of the seated person onto the seat portion. The seat portion and the back rest portion are coupled to each other by a coupling lever and a holding element for holding the back rest portion so that when the seat portion is inclined forwardly the back rest portion is also inclined forwardly and when the seat portion is inclined rearwardly the back rest portion follows this motion of the seat portion.

Abstract: A chair is described which comprises a fixed base structure, a seat, an element moveable relative to the fixed structure of the chair, the moveable element being moveable from a first operative position to a second operative position as a result of a thrust exerted by the body of a seated person, and resilient means biasing the moveable element towards its first operative position. The seat of the chair has at least one part moveable substantially vertically (the movement of the moveable element being distinct from the substantially vertical movement of the moveable part of the seat). The chair also includes a resilient member for returning the moveable part of the seat to a raised position for sensing the weight of the seated person, and for adjusting automatically the load of the resilient member in dependence on the weight of the seated person.

Abstract: The invention is concerned with assistance to handicapped persons. The device according to the invention is in the form of an articulated structure comprising two symmetrical lateral systems each comprising a first deformable quadrilateral, a second deformable quadrilateral, a trilateral, an elastic member and a manoeuvring assembly. The invention is applicable to wheelchairs for handicapped persons or invalids.

Abstract: A chair includes a seat support, a seat formed of two portions one of which is rigidly connected to the seat support, and a back rest also formed of two portions one of which is connected to another portion of the seat. The two seat portions are pivotally connected to each other and the two back portion are also pivotally connected to each other. The pivotable portion of the seat together with the back can swing from the sitting position of the chair to the backward-leaning rest position by means of a quadrangular linkage having four arms pivotally connected to each other. Two adjacent arms of the linkage are pivoted with respect to the rigid portion of the seat, about a pivoting connection near the horizontal axis of the pivotable portion of the seat.