Abstract: A modular arm rest system for a chair. The arm rest includes a connecting member that is installed into an interior cavity in the chair frame and is retained by a nose. A back is also provided with an arm rest hole that the connecting member can be installed through, thereby securing the back to the chair frame. The modular system includes a reclining chair and a four-legged stacker chair with arm rests and plugs so that the chairs can be reconfigured as desired by the user.

Abstract: An adjustable in height armrest comprises a tubular armrest column and a tubular armrest carrier telescopes on the armrest column. An arm support is secured to the top of the armrest carrier. The armrest column is releasably lockable at various heights and angles using a releasable locking system. The releasable locking system includes two locking members carried by the armrest carrier and lockable with the armrest column spring biased lock release member is slidable on the armrest carrier and moves between a locked position and a release position against the spring bias. In the release position the locking members are free to move outwardly allowing movement of the armrest carrier and the armrest column for both height and angular adjustment thereof.

Abstract: An armrest assembly includes a lower part defining a lower chamber, and an upper part defining an upper chamber therein. An abutting member is disposed in the upper chamber. A cylinder-and-piston unit includes a cylinder extending into the upper chamber to abut against the abutting member, and a piston mounted securely in the lower chamber and telescopically extending into the cylinder. A locking member includes a spring-biased button projecting from the cylinder, extending through the abutting member and into the upper chamber, and pressible to move between a locked position, in which, the cylinder is locked by the locking member against axial movement relative to the piston, and an unlocked position, in which, the cylinder is axially movable relative to the piston.

Abstract: An armrest assembly includes a lower part defining a lower chamber, and an upper part defining an upper chamber therein. An abutting member is disposed in the upper chamber. A cylinder-and-piston unit includes a cylinder extending into the upper chamber to abut against the abutting member, and a piston mounted securely in the lower chamber and telescopically extending into the cylinder. A locking member includes a spring-biased button projecting from the cylinder, extending through the abutting member and into the upper chamber, and pressible to move between a locked position, in which, the cylinder is locked by the locking member against axial movement relative to the piston, and an unlocked position, in which, the cylinder is axially movable relative to the piston.

Abstract: An adjustable armrest and height adjustment mechanism. The adjustable arm rest has a fixed member having a housing, a vertically adjustable member having a post slidably disposed in the housing, and a sleeve disposed intermediate the post and the housing. The height adjustment mechanism can include a camming slot formed in the post, an angled slot formed in the sleeve member on opposite sides of the camming slot, a locking pin positioned through each of the camming and angled slots, and a bushing projecting into the angled slot and defining upper and lower regions thereof in which the locking pin can be held. The locking pin is movable between respective notches responsive to upward vertical movement of said post such that the vertically adjustable member is held at a height corresponding to each notch until further upward vertical movement of the post.

Abstract: A chair with a back arrangement employing a back shell slidably supported on a pair of uprights projecting upwardly from opposite sides of the chair seat. The chair includes manually releasable latching mechanisms which cooperate with the uprights to allow height adjustment of the back arrangement. The chair additionally incorporates an adjustment mechanism which allows manual adjustment of the chair arms into the desired position.

Abstract: The invention relates to a seat, especially a vehicle seat, and preferably an air passenger seat, comprising a seat element and a seat element carrier (12), a backrest (10) which can be adjusted in terms of the incline thereof, and at least one armrest (14), said armrest being pivotably joined to the backrest (10). The armrest (14) is continuously moved with the increasing or decreasing incline of the backrest (10) by means of an adjustment mechanism (20), said adjustment mechanism (20) for the armrest (14) comprising at least four articulation points (22, 24, 26, 28). A parallelogram articulation of the armrest is thus achieved by which means said armrest can lower itself. The aim of the invention is to be able to practically bring the backrest into a horizontal position in which the so-called parallelogram geometrically follows a fictitious line in an average incline position of the backrest, the four articulation points of the parallelogram lying on one line.

Abstract: An arm assembly (24) is provided for a chair (12). The chair (12) has a forward direction and a rearward direction. The arm assembly (24) includes an armrest (26) and a support structure (28). A mounting device movably mounts the armrest to the support structure. The mounting device constrains the movement of the armrest (26) relative to the support structure to movement in a substantially horizontal plane having two degrees of freedom defined by first and second transversely arranged axes lying within the substantially horizontal plane. The armrest (26) thus move in a substantially planar fashion without changing the orientation of the armrest (26).

Abstract: A child car seat includes a child-car-seat shell and an armrest. The armrest is attached to the shell. The armrest is adjustable for height at least between a first position and a second position.

Abstract: An adjustable four plate assembly for a chair including a first plate having a top surface and a bottom surface, a second plate having a top surface and a bottom surface adapted to receive the top surface of the first plate so as to allow for the pivoting of said second plate from side to side. A third plate having a top surface and a bottom surface adapted to receive the top surface of the second plate so as to allow for the lateral sliding of the third plate from side to side. A fourth plate having a top surface and a bottom surface adapted to receive the top surface of the third plate so as to allow for the sliding of the fourth plate forwards and backwards. The adjustable four plate assembly allows for the second plate, the third plate and the fourth plate to move independently of one another and or in combination with one another.

Abstract: The present invention relates to an armrest apparatus installed in a chair for a computer work. An armrest member which is freely movable on a horizontal surface by a link apparatus is provided in an upper portion of an armrest body vertically installed at both sides of a seat of a chair. The armrest apparatus is used as a common armrest for a chair at a usual time on which a user's arms are placed in such a manner that an armrest member is closely contacted with an upper surface of an armrest body or is lifted upwardly. The armrest member is upwardly lifted at the height at which a keyboard work is conveniently performed during a computer work, so that a user's arms are freely movable on the armrest on a horizontal surface.

Abstract: A back support for displacing a person's weight from the lower area of the spine by providing support for the upper torso and for use with a seat having a seat base and a seat back, the back support comprising two axillary rests disposable against the seat back and protruding therefrom, supporting the major muscles in the area of each axilla. Each axillary rest may swivel to become relatively flush with the seat back. The support can be provided from the top using the seat back or headrest, or alternatively from the bottom using the seat base, or from a combination of both.

Abstract: A simple, inexpensive and reliable chair adjustment mechanism is disclosed. The mechanism includes a base which is fastened to a chair support, a slide attached to an assembly to be adjusted, such as a back or a seat or arms, and a spring device cradled by the base for engaging one of a series of spaced ramps integral with the slide. The slide also includes ramps for pushing the spring device into an out-of-the-way position secured to two hooks on the base so that at the end of the slide's extension it may be returned to a retracted position in one easy movement. When reaching the retracted position, other ramps push the spring device out of the engagement with the hooks so that the spring device extends through a space between the base and the slide to again selectively engage the series of spaced ramps.

Abstract: An armrest for a passenger seat includes an armrest support for being pivotally-mounted to a seat frame for movement between a lowered position and a raised position. The armrest support defines a void for carrying wiring and cabling and an opening adjacent the pivoting end of the armrest for permitting access to the interior of the armrest support. An armrest pivot cover is provided for normally being received in and covering the opening of the armrest support to protect the wiring and cabling. The armrest pivot cover includes a pivoting cylindrical member mounted for pivotal movement in a socket for a predetermined range of pivotal movement relative to the armrest support. A flexible hinge is carried by the pivoting cylindrical pivoting member for permitting further movement of the lower armrest cover past the partially-open position to a fully-open position thereby exposing fully the wiring for installation or service access.

Abstract: A chair is provided with an outrigged limb rest for supporting a user's substantially outstretched arm. The chair has a seat for supporting the user, an adjustable outrigger connected to the seat, and a limb rest carried on the adjustable outrigger for supporting the user's outstretched arm. The adjustable outrigger includes a mechanism for adjusting or varying the elevation of the limb rest between upper and lower extremes as well as varying the inboard to outboard position of the limb rest between inboard and outboard extremes such that the limb rest is positionable to afford a rest or landing place for the elbow, forearm, or both of the user's arm when substantially outstretched.

Abstract: A vertically and horizontally adjustable chair armrest is disclosed. The armrest includes an outer shroud, an upstanding support with a central opening and an armrest base. Within the central opening is a guide tube that moves vertically and has oppositely disposed slots. Within the guide tube, but mounted to rotate only, is a rod. At the lower end of the rod is a locking element that extends through the slots in the guide tube. The rod is rotated by a user pivoted lever bearing down on a spring biased activator nut. The nut is keyed to move only in a linear direction but is threaded to engage a mating thread on the rod, thereby causing the rod to rotate. When the locking element is rotated out of engagement with notches in the support opening, the armrest may be adjusted in a vertical direction. Releasing the lever allows the spring to bias the locking element into engagement with the notches to lock the armrest.

Abstract: A gear-controlled height-adjusting mechanism for armrest of office chair mainly includes an armrest support received in a housing, an elongated slide member vertically movably connected to an upper outer side of the armrest support and having a bottom rack, and a gear set mounted on the armrest support. The gear set includes a driving gear meshing with the rack, and a driven gear meshing with a vertical row of locating holes provided in the housing. The height-adjusting mechanism further includes a release mechanism for freely lowering the armrest support to a desired height. To adjust the armrest to a higher position, simply alternately upward pull and release the slide member for the bottom rack to forward rotate the driving gear and accordingly the driven gear. When the forward rotating driven gear engages with the locating holes, the armrest support is gradually moved upward in multiple stages.

Abstract: A light-weight portable vertebrae decompression support device comprising a pair of arm rests with selectively adjustable members connecting the arm rests and a base member. The base member is adapted to rest on a seat. The selective adjustment raises and lowers the height of the arm rests with respect to the base. The support device provides arm support sufficient to decompress the vertebrae and aids persons recovering from back surgery or those with chronic back problems. The support device can be made adjustable to fit different girth persons.

Abstract: A chair, or other office furniture device, includes a first and second support member. The first support member has a longitudinal extent and a fluid passageway formed within at least a portion thereof. A first piston, having a first and second end, is moveably disposed in the fluid passageway. The second support member is coupled to the first end of the first piston. A fluid supply is disposed in the fluid passageway and communicates with the second end of the first piston. A pressure is applied to the fluid supply. A fluid flow controller controls a flow of the fluid supply and is operable between at least an open and closed position, wherein the fluid supply is allowed to flow when the controller is in the open position and wherein the fluid supply is not allowed to flow when the controller is in the closed position.

Abstract: A four way adjustable armrest for use on a vehicle seat includes an arm support member having a extension member and the armrest is connected to a seat back including a pair of toothed track members extending along the seat back. A toothed gear is movable on the extension member of the armrest between an engaging position where the armrest position is locked and a retracted position where the gear teeth are removed from the toothed track members and the armrest is free to rotate and to translate along the track members via a track follower. The gear has a splined inner diameter and is carried on mating splines on an outer surface of the cylindrical extension member. A pivoting actuating member moves or throws the gear on the splined extension member between the engaged and retracted positions.

Abstract: A seating structure includes a backrest having a top and bottom and includes a frame. The frame includes a pair of spaced apart side members defining an opening therebetween. Each of the side members has a length. A flexible membrane extends between and is attached to the side members across the opening. An armrest is moveably mounted to each of the side members. Each of the armrests is adjustably moveable along at least a portion of the length of the side members between at least a first position and a second position. The first position is closer to the bottom of the backrest than the second position. A method of adjusting the seating structure is also provided.

Abstract: A chair having an adjustable resilient back recliner mechanism, a pair of adjustable armrests, modular upper back portions and an adjustable lumbar support. The chair includes a tension control that adjusts the tension in the recliner mechanism. The tension control is cam-operated to permit adjustment throughout the entire range of adjustability with only limited rotational movement of a control knob. The chair includes a recline limit control that adjusts the limit of rearward movement in the recliner mechanism. The limit control includes a cable operated stop that interact with a stepped trackway on the seat. The chair further includes a height control for adjusting the seat height including a push-button located in the tension control knob. The armrests include height and angle adjustment mechanisms. The lumbar support includes a lumbar cam that is rotatably mounted to a lumbar pad.

Abstract: A system having a plurality of platforms for positioning control devices near an occupant of a chair. The system includes a first and second support shaft affixed to each side of a chair. A first side platform is affixed to the first support shaft. A second side platform is affixed to the second support shaft. A front platform is positioned in front of the chair. The front platform may be rotated away from the front of the chair by a pivot system which assists in moving the front platform. The system may also include two accessory platforms mounted adjacent each side platform. All the platforms may be adjustably positioned for the occupant of the chair. Computer and gaming control devices may be placed on top of the platforms.

Abstract: A height and pivot-adjustable office chair arm assembly with an arm rest that can be raised to different vertical positions by actuation of a gas cylinder and having a shroud surrounding and vertically movable with respect to at least a portion of an arm support that is hollow and surrounds the gas cylinder such that the shroud is vertically movable in relation to at least a portion of the arm support. The shroud is connected to the gas cylinder at an upper end for vertical movement by the gas cylinder. An arm rest pivot support is attached only to the shroud and receives the arm rest assembly and enables the arm rest assembly to pivot in a horizontal plane thereby allowing the arm rest assembly to assume any selected rotational position.

Abstract: A reclining passenger seat, including a seat frame for being attached to a supporting deck, a seat bottom carried by the seat frame, and a seat back carried by the seat frame and moveable with the seat bottom from and between the upright and sleep positions. A legrest assembly is mounted adjacent a forward end of the seat bottom for being selectively extended generally downwardly and outwardly from the seat bottom for supporting the legs of the passenger. An armrest assembly is carried by the seat frame and includes an armrest moveable between a horizontal position with an upper support surface supporting a forearm of the seat occupant in the upright seat position and a forwardly-inclined, lowered position wherein the upper support surface is aligned with an upper surface of the seat bottom for providing a wider sleeping surface for the seat occupant when the seat is in the fully-reclined sleep position.

Abstract: A chair is provided with adjustable armrests. The chair has two vertical guiding bars, each of which extends down from a lateral side of a back thereof, and each of which has engaging trenches spaced along it. Each armrest has a connecting space extending vertically through a rear end thereof, and is up and down movably connected to a corresponding guiding bar at the connecting space thereof. A lever is pivoted to a bottom of the rear end of each armrest. Each lever has an engaging projection, which can be fitted into one of the engaging trenches of corresponding guiding bar to make the armrest unmovable by means of pivoting the lever to the locking position. When the levers are in the unlocking position, the armrests can be adjusted in height.

Abstract: A child car seat includes a child-car-seat shell and an armrest. The armrest is attached to the shell. The armrest is adjustable for height at least between a first position and a second position.

Abstract: A gear-controlled height-adjusting mechanism for armrest of office chair mainly includes an armrest support received in a housing, an elongated slide member vertically movably connected to an upper outer side of the armrest support and having a bottom rack, and a gear set mounted on the armrest support. The gear set includes a driving gear meshing with the rack, and a driven gear meshing with a vertical row of locating holes provided in the housing. The height-adjusting mechanism further includes a release mechanism for freely lowering the armrest support to a desired height. To adjust the armrest to a higher position, simply alternately upward pull and release the slide member for the bottom rack to forward rotate the driving gear and accordingly the driven gear. When the forward rotating driven gear engages with the locating holes, the armrest support is gradually moved upward in multiple stages.

Abstract: A chair having a swingable chair back with a top pivot includes a frame having laterally spaced first and second uprights. A back having upper and lower ends is attached to the frame. Also attached to the frame adjacent the lower end of the back is a seat. A pivot assembly couples the first and second uprights to the back and permits pivoting of the back about a substantially horizontal pivot axis. The pivot axis projects laterally of the back and is positioned in the vicinity of the upper end of the back. A biasing device cooperates with the back and normally urges the lower portion of the back forwardly away from a rearward position.

Abstract: An adjustable arm rest includes a plate secured on top of a housing with one or more fasteners and having one or more catches, and a casing slidably engage with the fasteners to guide the casing to slide relative to the housing and the plate. A board is slidably disposed above the plate and includes a number of recesses to selectively receive the catches of the plate, and to adjustably position the board and the casing to the plate and the housing. A follower may force the board away from the plate, to selectively disengage the catches of the plate from the board, and to allow the casing to be adjusted forwardly and rearwardly relative to the casing.

Abstract: An arm assembly includes an outer stem (52) and an inner stem (50) slidable in the outer stem and including a number of recesses (107) along its length. A biased locking device (117) engages one or more of the recesses (107) to lock the position of the inner stem (50) relative to the outer stem (52). A release member (103) operably connected to an actuator (101) has a number of recesses (110) and raised surfaces (112), the release member (103) slidable relative to the inner stem (50) between a first position in which recess(es) (110) in the release member is/are aligned with recess(es) (107) of the inner stem and the locking device (117) engages recess(es) in the stem (50) to inhibit movement thereof relative to the outer stem, and a second position in which raised surface(s) (112) of the release member align(s) with recess(es) (107) of the stem (50) to disengage the locking device from the recess(es) of the stem.

Abstract: 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 back support about a second horizontal axis and moveably supported by a curved track formed on the housing. A leaf spring includes a first end supported by the housing and a second end biasing the back support and seat support in an upward direction. Preferably, a fulcrum member, which includes a support surface having a curvilinear contour, is moveably supported in the housing and engages a bottom surface of the spring intermediate the first and second ends of the spring. Preferably, a linkage mechanism including a first and second link is adapted to adjust the position of the fulcrum. In another preferred embodiment, a gear housing is removably disposed in said housing and coupled to the fulcrum. In one preferred embodiment, rearward and forward tilt limiters are provided.

Abstract: A chair having adjustable height arms includes a rigid chair frame having first and second uprights. A back is attached to the chair frame and includes upper and lower ends. A seat is also attached to the chair frame and is adjacent the lower end of the back. Cantilevered to each of the first and second uprights is an arm assembly that projects outwardly therefrom adjacent opposite sides of the seat. Each arm assembly includes a coupling structure that is releasably engaged with a respective upright and is configured to release from the upright when the arm assembly is tilted upward relative to the respective upright to permit the elevational position of the arm assembly to be adjusted.

Abstract: A height-adjustable and rotatable chair arm for an office chair includes a rotatable sleeve that is rotatably connected to an upright support post of the chair, and an arm assembly supported on the sleeve. Rotation of the sleeve relative to the upright permits the chair arm to be rotated to a desired position. Additionally, the sleeve includes a vertical row of slots and the arm assembly includes a lock mechanism which engages the slots whereby the arm assembly is vertically slidable along the sleeve and lockable at a selected elevation to adjust the height of the chair arm.

Abstract: An armrest elevator device has an armrest seat, an elevator plate, a movable block, a cover plate, a control button, a spring, and a pair of cylinder shafts. The elevator plate has a plurality of pairs of click grooves. The movable block has a top head having a round blind hole to receive the spring. The control button has a center recess. The armrest seat has a pair of rail sets, an oblong hole, an elongated groove, a pair of oblong apertures, and an oblong recess. The elevator plate is inserted in the armrest seat. The movable block is inserted in the elongated groove of the armrest seat. Each cylinder shaft is inserted in the corresponding oblong aperture of the armrest seat. The cover plate engages with the oblong hole of the armrest seat. The top head of the movable block is inserted through the cover plate and inserted in the center recess of the control button.

Abstract: A chair comprises an arm mechanism and a back mechanism each having an adjustment screw for releasably securing a sleeve and a shroud to a J-bar so that a height of either arm or back mechanism can be adjusted relative to the j-bar. Also, a protruded enlargement is formed at a top end of the upright backrest support.

Abstract: A mechanism for adjusting the height of a chair back relative to the seat includes an arm that extends upwardly from the rear of the seat, and a carriage that is carried by the back and slidably mounted on the arm. A pinion inside the carriage engages a rack on the arm so that the pinion travels along the rack when the chair back is moved up and down on the arm. A pawl engages the pinion when the chair back is moved upwardly so as to allow incremental adjustment in the height of the back in the upward direction, while preventing downward movement of the back. When the back reaches the upper limit of its travel, an actuator spring is displaced downwardly, disengaging the pawl so that the back is free to slide on the arm. At the bottom of the limit of travel, the spring is displaced upwardly, re-engaging the pawl.

Abstract: An armrest of a chair which can be adjusted and which can be moved in a transverse horizontal direction with respect to the longitudinal direction of the armrest. Regardless of the position thus obtained, the armrest is capable of turning on an essentially vertical axis between two extreme positions, so to adapt to the specific needs of the user and to the activities to be performed in an optimal way.

Abstract: An armrest assembly comprises an armrest having an end pivotally attached to a backrest of the chair, a fixing member having an end fixed to a seat of the chair, and an adjusting device having an end engaged with the other end of the armrest in a manner allowing relative sliding movement therebetween when the end of the armrest pivots. The other end of the adjusting device is slidably engaged with the other end of the fixing member such that movement of the adjusting device relative to the fixing member causes a change in a height of the armrest.

Abstract: A car seat is constructed to be adaptable for use by children within the toddler-size range and the youth-size range. In particular, the car seat includes cam-shaped arm rests which can be rotated about an axis roughly parallel to a seat bottom, with the rotation resulting in supporting surfaces at different heights relative to the seat bottom. In addition, the car seat has a base portion which allows a seat body to be reclined relative to the base portion, and a five-point harness which is easily removed or adjusted for children of varying heights. The car seat also has a moveable or removable head support. The car seat can be adjusted for children of varying heights and weights, avoiding the costs of multiple car seats for different sized children.

Abstract: A chair having a swingable chair back with a top pivot includes a frame having laterally spaced first and second uprights. A back having upper and lower ends is attached to the frame. Also attached to the frame adjacent the lower end of the back is a seat. A pivot assembly couples the first and second uprights to the back and permits pivoting of the back about a substantially horizontal pivot axis. The pivot axis projects laterally of the back and is positioned in the vicinity of the upper end of the back. A biasing device cooperates with the back and normally urges the lower portion of the back forwardly away from a rearward position.

Abstract: A chair having adjustable height arms includes a rigid chair frame having first and second uprights. A back is attached to the chair frame and includes upper and lower ends. A seat is also attached to the chair frame and is adjacent the lower end of the back. Cantilevered to each of the first and second uprights is an arm assembly that projects outwardly therefrom adjacent opposite sides of the seat. Each arm assembly includes a coupling structure that is releasably engaged with a respective upright and is configured to release from the upright when the arm assembly is tilted upward relative to the respective upright to permit the elevational position of the arm assembly to be adjusted.

Abstract: An adjustable armrest assembly for a chair provides adjustment in both the vertical and horizontal position of an armrest member. A tubular member is adapted for telescopic mounting to an upwardly extending support member mounted to the chair. The support member includes a series of spaced teeth defining indentations therebetween. The armrest assembly includes a pivotable latch member which is secured to the tubular member utilizing a cap member mounted to the upper end of a passage defined by the tubular member. The cap member and the tubular member define cooperating mounting structure for providing pivoting movement of the latch member. The latch member is movable between an engaged position, in which the latch member is engaged with an indentation between the teeth defined by the support member, and a disengaged position in which the latch member is moved out of engagement with the teeth.

Abstract: A height adjustment device, in particular for seat back portions and arm-rests in office chairs, comprising a guide element (14, 48) rigid with the support plate (10) for the seating portion (12), a slide (22, 42) supporting the movable part (18, 20) and engagable with and slidable along said guide element, and means (38) selectively engagable in one of a plurality of teeth (31) to provide a configuration of stability, said selectively engagable means sliding freely along the passive flanks of the teeth of the toothed portion during the raising of the movable part, and lockable by the active flanks each time a tooth is passed over, said selectively engagable means being disengagable, for a predetermined position of said slide (22, 42) relative to said guide element (14, 48), from said teeth thus enabling said slide to move by gravity along said guide element, characterized in that said toothed portion (28) is faced by a toothed counter-portion (32) the teeth (34) of which form with the teeth (31) of said toot

Abstract: A height adjustable wheelchair apparatus for allowing users to be able to move more easily in and out of the wheelchair. The height adjustable wheelchair apparatus includes a frame, a wheel assembly upon which the frame is mounted, a seat member being mounted to the frame and being adapted to be raised and lowered, a backrest being mounted to the frame, an armrest assembly being removably mounted to the frame; and further includes a lift assembly being mounted to the frame and being adapted to raise and lower the seat member.

Abstract: A chair, or other office furniture device, includes a first and second support member. The first support member has a longitudinal extent and a fluid passageway formed within at least a portion thereof. A first piston, having a first and second end, is moveably disposed in the fluid passageway. The second support member is coupled to the first end of the first piston. A fluid supply is disposed in the fluid passageway and communicates with the second end of the first piston. A pressure is applied to the fluid supply. A fluid flow controller controls a flow of the fluid supply and is operable between at least an open and closed position, wherein the fluid supply is allowed to flow when the controller is in the open position and wherein the fluid supply is not allowed to flow when the controller is in the closed position.

Abstract: A height adjusting mechanism is connected between a rigid upright extending upwardly from the seat assembly and an inner shell of the back assembly. The height adjusting mechanism includes a ratcheting latch which engages a vertically elongate rack to maintain the back assembly at a selected elevation and a release lever or cam which is connected to the catch and automatically disengages the catch from the rack at the upper limit of travel of the back assembly. The release cam continuously contacts the inner shell of the back assembly and is deactivated merely by a short upward shifting of the back assembly which thereby permits the pawl to reengage the rack at any desired elevation. Accordingly, reengagement of the pawl with the rack can be accomplished at any point between the upper and lower limits of travel of the back assembly.

Abstract: This invention provides an elevation mechanism for an armchair armrest, comprising a T-shaped post, a catch cylinder, an adjustment unit, a reflex plate, a U-shaped block and a resilient spring that are fastened by a plurality of screws. At the center of the T-shaped post is a U-shaped depression, on which are a first screw hole, a cross through hole and a second screw hole spaced from top to bottom. The first screw hole serves to fasten a first screw inserted in a first through aperture on the adjustment unit. The vertical slot of the cross through hole accommodates the insertion of the depressed groove of the adjustment unit. The horizontal slot of the cross through hole accommodates a U-shaped block that goes with the depressed groove. At the center of the adjustment unit is a third screw hole to accommodate and fasten a second screw inserted through the second through hole on the reflex plate.

Abstract: An armrest assembly includes a tube secured to a chair seat and an adjusting seat mounted in the tube. An actuating member includes a vertical section slidably received in a longitudinal groove of the adjusting seat. A slide member is slidably attached to the vertical portion of the actuating member to move therewith. An armrest is securely mounted to the actuating member to move therewith. An operative member is securely attached to the slide member for manual operation. Two positioning members are respectively, releasably engaged with two sets of vertically spaced positioning notches in the adjusting seat under the control of the slide member that is moved by the operative member.

Abstract: An armrest assembly for a chair which can be adjusted in multiple aspects with the use of single actuating mechanism. The adjustment aspects of the preferred embodiment include a vertical adjustment with respect to the chair and a horizontal rotational adjustment. Such an armrest assembly can include an armrest base securable to a chair and having a tubular portion, a hollow armrest support slideably and rotationally disposed about the tubular portion and an armpad attached to the top of the hollow armrest support. A handle to disengage the actuating mechanism is provided.