Abstract: A folding table has a table top of synthetic plastic material with an upper working surface and an underside, the underside having at least one rearwardly located leg retainer and at least one forwardly located strut retainer. A leg assembly has an elongated connecting member and a pair of legs extending from opposite ends of the connecting member, each leg having a foot member extending from a lower end thereof remote from the connecting member. An angularly movable strut is pivotally secured at the rear to at least one of the legs and is releasably engageable at the front with the strut retainer. The strut is angularly moveable between a working position in releasable engagement with the strut retainer to maintain the tabletop in a working position and a retracted position between the legs when released from the strut retainer.

Abstract: A drawing table includes two parallel stands, two top supports pivoted to the stands at the top and supported on short horizontal rods on the stands by a second adjusting device being controlled to adjust the angular positions of the top supports on the stands, a drawing board mounting frame having a front side pivoted to two parallel top supports and a rear side connected to the stands by a first adjusting device being controlled to adjust the angular position of the drawing board mounting frame on the top supports, two lifting gears mounted on an upper cross rod between the stands and respectively connected to the drawing board mounting frame and a cross rod between the top supports, and two tie rods mounted on a bottom cross rod between the stands and respectively connected to either short horizontal rod.

Abstract: A work station for the handicapped includes work surface structure, support structure, and structure for urging the work surface structure upward relative to said support structure. Engagement structure is provided for securing the work surface structure in a plurality of positions relative to the support structure. Release structure is provided for disengaging the engagement structure to permit repositioning of the work surface structure. The release structure is preferably a grip bar positioned substantially at the front of the work surface structure to facilitate operation by the handicapped.

Abstract: A simple and elegant activity center and drawing table is described; the preferred example is for children to use in bed, and consists of a drawing surface mounted on a rectangular frame, which is in turn supported on two boxes. The boxes sit on either side of the legs of a bed-ridden child, and are open on the sides for storage. Rolls of paper on either side of the drawing surface supply drawing paper; a window in the drawing surface and a gravity bar to hold a subject design allow tracing; and a latch-and-pivot behind the frame, in conjunction with hinges between the frame and boxes, allow the drawing surface to be raised to predetermined oblique angles. Alternatively, the surface may sit flat and be used as a table. A lip prevents crayons, pencils, or books from sliding off, and all parts near the front are rounded to prevent injury. All the described mechanisms can be easily manoeuvred by a child while in bed, without adult help.

Abstract: An adjustable display rack is detailed which provides several advantages including ease of operation and stability. The adjustable display rack comprises a bottom frame, a bin pivotally mounted to the bottom frame, an adjustable support member connecting the rearward portion of the bottom frame and bin, optional legs, optional walls and optional drawers.

Abstract: An apparatus to position a quilting hoop organization relative to an individual's lap includes a base plate having telescoping first and second tubes extending from the base plate in an orthogonal relationship, with the second tube mounting positioning tubes in a manner to pivotally position the quilting hoops in a desired angulation relative to an individual's lap. The apparatus is arranged for ease of disassembly for transport and storage.

Abstract: A table construction which makes possible work in a sitting position as well as in a standing position comprises two table tops (4,7) hingedly connected to each other and together with a link (10) and a part of a base frame (1) forming a parallel arm structure with one of the table tops (7) substantially horizontal irrespective of the angular position of the second table top. Pivotally connected to the link (10) is a catch arm (13) which cooperates with a catch (14) provided at the base frame. A resilient support arm (16) counteracts the folding up of the link when the latter approaches its uppermost position and maintains the catch arm in a safe engagement with the catch.

Abstract: An ergonomically designed computer workstation includes a computer stand, stool, footrest assembly, and keyboard and forearm support assembly being adjustable so that the workstation can accommodate users in various sitting and standing positions. The stand has a base member, an upright member supported by the base member for vertical movement, and a planar platform mounted by the upright member in a horizontal plane to provide a support surface for a variety of computer equipment. The stool includes a stationary base and a seat with a back for supporting a user thereon. The stool can be adjusted to vertically move the seat away from or toward the base to position the seat at a desired elevation. The footrest assembly is mounted to the base member of the stand and can be adjusted to and positioned at a desired elevation corresponding to the desired elevation selected for the stand platform and stool in order to permit the user to assume an ergonomically proper position at the stand and on the stool.

Abstract: A table with a movable working surface is supported on a table frame with legs. A running rail arrangement is provided on the table frame and cooperates in a form fitting relationship with a pair of edge rails extending from the working surface. The running rail arrangement is divided into two running rail elements. A first running rail element is rigidly fixed to the table frame. A second running rail element is rotatably mounted to the table frame at a location adjacent to the first running rail element. The first running rail element has a sloped bearing surface on which the second running rail element is supported when the working surface is in a horizontal position. Each edge rail includes a holding and sliding element for supporting the second rail running element. During usage of the work surface, the holding and sliding element is located either under the first running rail element or is supported on the sloped bearing surface of the first running rail element.

Abstract: A metal stand for supporting fabric materials being used in arts and crafts projects. The stand is adjustable with full 360 degree rotation of the top portion, a tilt angle of 180 degrees, and a vertical height adjustment. The stand has a flat base which supports the middle portion having the adjustment mechanisms which in turn supports the top portion having ledges for supporting an embroidery hoop. The top portion is interchangeable with others to accommodate different sized hoops. The stand was designed so that when the user is seated, the project on the hoop rests on the stand directly in front of the user. the adjustments for height, tilt, and rotation are manually set, and the mechanisms are simple and re-adjust easily.

Abstract: This invention describes a computer workstation which places the monitor below and behind the keyboard. The shelf for holding the monitor is rotatable independently of movement of a shelf for holding the keyboard. A plurality of shelves are also provided for additional equipment and supplies. In one embodiment, the workstation has separate paper supply and used paper holding shelves. In another embodiment, these shelves are combined.

Abstract: A shelf has a device to adjust its height on a pair of mounting rails and a device to adjust its angle with respect to the mounting rails.

Abstract: A keyboard support apparatus has a mounting bracket (11), a keyboard support bracket (15) pivotally connected via parallel bars (20, 25) permitting change in altitude of bracket (15). The mechanism may be locked against change in altitude by means of a formation 58 associated with a bar (20) which is interengageable with a formation (54) associated with bracket (15) by means of a laterally operable lever 40 resiliently biased by a spring plate 52 towards engagement. In a preferred embodiment (FIGS. 13 to 15) support bracket (15) may be tilted about a pivot (22) and the mechanism permits one-handed selective operation of altitude adjustment or tilt adjustment.

Abstract: A desk apparatus for use as a desk or easel is arranged, wherein the desk plate is mounted upon an underlying rectangular framework, including a forward pivoting of the plate and a rear telescoping leg to orient the desk plate at a predetermined angle. A forward tray is selectively and pivotally mounted relative to a forward end of the desk plate, with container drawers slidably mounted orthogonally relative to opposed side edges of the desk plate. A modification of the invention includes indicator members arranged for indication of desired orientation of each container drawer relative to the desk plate utilizing fiber optical cables selectively alignable relative to the container and desk plate.

Abstract: A lift device for adjusting the angular position of a worksurface such as a desk top lying thereon includes a glide sheet (103) upon which the edges of hinged fulcrum plates (100) rest. Protruding pivot pins (120) abut against the edges of the plates and are moved in curved guide slots (131) by means of a lift mechanism (1). The mechanism includes scissors arms (110) which move in accordion-like fashion by operating a lever arm (145). A translation bar (150) interconnects the scissors arms and the lever arm (145). A locking mechanism (160) actuable by pressure-release of a handle (142) may be provided to latch the lever arm in the desired position. The mechanism may be conveniently contained in a housing (9), to provide a drop-in assembly (5) for installation in a desk top or worksurface support system. As an alternative to the manually-operated lever arm, an electric motor (180) may be provided to actuate the scissors arms (110).

Abstract: A drafting table that is convertable into an office desk. A first pedal member allows the user to adjust the angle of a platform that supports a preselected drafting board and a second pedal member allows the user to adjust the position of the board with respect to the platform. The desk or table includes hingedly-mounted door members which lock automatically when the board-supporting platform is in its down position.

Abstract: A comprehensive needlework unit is provided that includes a work table, a detachable frame that holds the stitched fabric and a light source. The components are all mounted to separate pivotal arms that attach to an upright stand mounted to a base plate. The frame has two rollers with the fabric mounted between them. The rollers can be loosened or clamped down when it is desired to advance or lock in the fabric. The work table contains holders for scissors and scrap material as well as for pins and needles.

Abstract: A commodity data inputting device including a keyboard retained on a base which is pivotally connected with a mounting member. A plurality of engaging portions are formed at one of opposed side portions between the mounting member and the base, and are arranged along an arc defined about a pivotal axis of the base. An engaging bar is normally engaged with one of the engaging portions by a biasing force applied toward the pivotal axis. A retaining portion is formed at the other of the opposed side portions to retain the engaging bar at its opposite ends. A release lever normally abutting against the engaging bar is displaceable by a biasing force larger than the biasing force applied to the engaging bar. An operating portion for operating the release lever is connected thereto through a wire and a spring connected with the wire.

Abstract: A keyboard support apparatus has a mounting bracket (11), a keyboard support bracket (15) pivotally connected via parallel bars (20, 25) permitting change in altitude of bracket (15). The mechanism may be locked against change in altitude by means of a formation 58 associated with a bar (20) which is interengageable with a formation (54) associated with bracket (15) by means of a laterally operable lever 40 resiliently biased by a spring plate 52 towards engagement. In a preferred embodiment (FIGS. 13 to 15) support bracket (15) may be tilted about a pivot (22) and the mechanism permits one handed selective operation of altitude adjustment or tilt adjustment.

Abstract: An equipment carrier, e.g. for a monitor or measuring device and having a mounting plate is described, which is tilt-adjustable and lockable in different tilt angles. The equipment carrier comprises a base frame mounted on runners and on which are arranged two columns. A mounting plate is vertically adjustably suspended by means of two oscillating arms between the two columns.

Abstract: A pivotally adjustable ironing board including a supporting frame and first and second ironing tables which rotate separately about separate portions of a substantially horizontally disposed portion of the supporting frame. The first ironing table includes two major working surfaces arranged parallel one with the other; the second ironing table includes two major working surfaces arranged in non-parallel, non-coplanar fashion one with the other. The second ironing table includes a profiled edge portion at one end which edge is arranged to accommodate a garment and to facilitate pressing of that garment. Each ironing table employs a separate spring biased locking mechanism each of which is used to secure its respective ironing table at least generally horizontally in a position for use. The supporting frame is adjustable and includes telescoping members and a securement device which device secures the telescoping members with respect of one to the other, to establish a desired height for the ironing surfaces.

Abstract: A foldable table with a table top adapted to be positioned erect when not in use, and to be set in either a horizontal state or a slightly slanted state. The foldable table comprises on each side thereof a locking mechanism contained within a housing. A first click member, a second click member and a locking disc are rotatably mounted in the locking mechanism, and the locking disc is adapted to be locked by engagement with the first click member and the second click member so that any shaking of the table top in either the horizontal state or the slanted state can be effectively prevented. The table top can be folded by disengaging the first and second click members from the locking disc. The setting or folding operation of the table top is conducted by lifting up the outer end of a lock releasing lever attached to the locking mechanism.

Abstract: An adjustable work stand has fixed and hinged legs connected to a leg bracket, a table having a table bracket connected to a fulcrum in the leg bracket and fixed leg, a lock bolt in the hinged leg indexes both legs and the tables in several configurations including a plurality of table angles and a collapsed storage configuration, and a single actuator operates the lock bolts for any and all adjustments of the work stand and its mechanism.

Abstract: A bracket and shelf assembly in which a first component comprising a bracket member or a shelf member, is provided with button means, and the other of the bracket member or shelf member comprises a second component having hole means therein, the hole means being adapted to receive the button means to connect the two components together, the button and hole means being so shaped as to facilitate locking of the two components together by sliding one component relative to the other.

Abstract: A portable adjustable table assembly is made of a lightweight tubular construction and provides an extremely wide range of adjustable positions to accommodate persons seated, confined to bed, or standing. The assembly includes a flat U-shaped base, a pair of extensible, telescoping legs extending vertically upward from one end of the base, and a dual axis table assembly including a pair of support arms pivotally attached to the upper ends of the legs and a pair of table arms pivotally attached to the support arms. The table arms may be pivoted between an extended position outwardly of the support arms and a retracted position within the support arms, both of which positions can be utilized to support a table top in a horizontal position. Either or both of the pivotal connections may be provided with bi-directional ratchet assemblies to provide a wide range of angular positions for the table top between the two primary horizontal positions.

Abstract: A work table for use in connection with a sheet metal brake is mounted on the frame of the sheet metal brake for swinging movement between a first position, where the table extends over the clamp of the brake to provide a convenient work surface for the preparation of a sheet of metal to be bent in the brake, and a second position, where the table is swung away from the clamp to enable access to the clamp for subsequent bending of the prepared sheet of metal, and is arranged to be biased by gravity into selective retention at either of the first and second positions.

Abstract: Disclosed is a foldable table whose table plate may be readily and easily folded down with a single operation of a knob and restored back to its horizontal position simply by lifting up the table plate as a natural motion of bringing the table plate to such a position through the use of a pair of cams mounted on a table plate bracket. One of the cams keeps the table plate in its horizontal position by engaging a stopper pin fixed from a support while the other cam releasably engages the first cam to the engaged state.

Abstract: A turn and tilt easel has a box base which has parallel and oppositely spaced sides and a bottom. The easel is attached to the base and is formed of upwardly extending members which are pivotally attached at one end midway along the length of the base. The easel is formed with first and second writing surfaces attached between and on each side of the upwardly extending members to form writing surfaces on each side. The writing surfaces are attached above the upper surface of the base by an amount which will permit the easel to rotate about the pivotal attachment at least fifteen degrees from the vertical or normal to the surface of the base. In the preferred embodiment, one writing surface will comprise a chalkboard, while the remaining side will comprise a dry-wipe board. A handle may be attached to the top of the easel for ease in transportation from one location to another. The base face can be used for storing writing material, such as "Magic Markers" for the dry-wipe board or chalk for the chalkboard.

Abstract: A checkout counter having a portion of the counter surface tilted in a direction facing the operator in which surface portion is mounted an optical scanner. The tilted counter surface portion also includes an adjacent supporting surface for a keyboard member. The remaining portion of the counter surface supports a check endorsement stand and a support member for supporting a customer display or a printing mechanism. Located adjacent the tilted counter surface are shelves for supporting cash and media drawers and doors enclosing a number of secure storage areas for storing electronic devices and other associated modules. A second embodiment is disclosed in which the tilted countertop portion is rotatably mounted to position the optical scanner at an angle to a horizontal plane in accordance with the checkout operator's preference.

Abstract: A worktable with a working surface which can be adjusted in height and/or inclination, which is connected with a table mount by means of an adjustment mechanism. A worktable which can be constructed of individual parts and which can be expanded in width and joined to modular systems is provided by the table mount being a base frame with two supporting columns arranged in the interval of table width and two preferably U-shaped leg members having a central joining portion, a base leg and supporting leg whereby the supporting columns are firmly connected with each other by at least one transverse connecting member and said central joining portion of said leg members adapted to be connected to said supporting columns of said base frame and that said adjustment mechanisms are mounted on the underside of said work surface between said support legs of said leg members and adapted to be connected to said supporting legs.

Abstract: An adjustable desk-top assembly is disclosed having upper, lower, and inner side panels, the upper and lower panels being spaced apart for forming a compartmentalized enclosure. The desk-top has an adjustable work surface capable of assuming a slope and a centralized cut-out portion therein for extending in a semi-circle around the user of the desk. The inner or door panels, are releasably secured and can be removed for accommodating any of a number of suitable components. The slope imparted to the work surface can be adjusted to an optimum level for the particular task and, by imparting greater slope and covering the components therein, a security measure is also provided.

Abstract: An audio-visual equipment station comprises a podium portion and a projector support portion. The podium portion includes a base member, a front wall, and a pair of upstanding, spaced apart side walls, each side wall having inclined top edges. A planar top surface is hingedly connected to the front wall, allowing the top surface to be pivoted from a rest position in which it is supported on the inclined top edges of the side walls to a nearly vertical position in which the surface may be used as an easel. A locking bar is provided for locking the surface in the nearly vertical position. In addition, an adjustment bar is provided for supporting the surface in a variety of positions between the rest position and the nearly vertical position. The projector support portion of the equipment station includes a base member, which is a lateral extension of the base member of the podium portion.

Abstract: A support for an object of appreciable weight (e.g., for a CRT display) comprises a mount 10 which, in use is located at a reference height. A crank 20 extends from this mount. A boom 12 is pivotally mounted on the mount and extends therefrom to and carries means (not shown) for attaching the intended object which is to be located at an adjustable height with respect to the reference height. A lift lever 26 and a gas strut 30 are carried wholly by the boom. A lift rod 36 is mounted between a position on the crank remote from the mount/boom axis 18 and the lift lever, the latter being pivotally mounted in the boom. The lift rod and the gas strut are connected to the lift lever, but with the strut at a greater separation from the lever's pivot than the rod. The gas strut engages the boom and counteracts the effects of gravity on the loaded support. In addition to the lift mechanism, the support can also incorporate a parallel motion and a tilt mechanism.

Abstract: It has been found that an adjustable table top assembly for a drafting table and the like may be provided utilizing braking elements comprising an elongated member pivoted intermediate its ends to be pulled downwardly by a foot pedal against the force of a spring for releasably engaging a bracket support carried by the pivoted table top.

Abstract: An adjustable table with a bulkhead bracket (20) permanently mounted on the wall or vertical surface of a watercraft, recreational vehicle, or the like. A davit shaped arm (30) slips into the bracket (20) and is axially rotatable, with detents (34) interfacing into notches (24) in the bracket for placement. A top attaching bracket (40) slips over the arm (30) on the horizontal end with detents (34) penetrating a pair of holes (42) to maintain stability and achieve adjustment. A top (50) is permanently secured to the top attaching bracket (40) providing a flat work surface and rotatable 360 degrees from the wall, also tilting 90 degrees horizontally for access.

Abstract: A portable tray assembly which is particularly adapted for use with furniture that is to be used on irregular surfaces. The assembly can be secured to the leg of the furniture at a selected radial position, the tray portion rotated to a selected position, leveled by way of a swivel joint, and secured by way of nut and screw locking means.

Abstract: A writing table includes a writing surface countersunk into a working plate. Continuous adjustment of the inclination of the working surface towards a user from being coplanar with the working plate to a maximum angle is achieved through provision of a roller situated beneath a rear portion of the working surface. An adjustable footrest for the writing table that can be manipulated by a user's foot comprises a further roller, the ends of which are supported by left and right profile members having a desired adjustment profile.

Abstract: A computer terminal work station assembly that includes a mobile mounting stand for a video display terminal (VDT), a keyboard, disc drive, printer paper and printer holding elements. The stand has two up-right joining members arranged so a work surface with the VDT immediately to the rear of the keyboard tilts away so that the screen of the VDT tilts from an angle of 90 degrees with reference to the work surface to 0 degrees with reference to the work surface. A printer paper support surface and printer support surface are located above and forward of the VDT to hold printer paper and a printer and to shield the VDT screen from any overhead light and other room reflections. A shelf is positioned below and diagonal to the work surface to hold the disc drive and provide ballast for the assembly.

Abstract: Permanent locking mechanism can be released temporarily by depressing a pedal when adjusting the height and orientation of the drawing board. The movable assembly comprising the table supporting pillar is connected to the balancing system by a cable attached at one end to a spring passing around a return pulley having its axle supported by a strap of which the corresponding notch is directed towards the base of the frame structure, then around another return pulley formed with a helical groove and secured to the top of the frame structure, the other end of the cable being attached to the pillar. A locking member interconnects the axle and the pedal, this connection being discontinued in case of undesired slackening or breakage of the cable.

Abstract: A device for locking a drawing board of a drawing table in a selected position; the drawing board consisting essentially of a working board secured to a movable cylindrical column adapted to slide vertically in a frame structure bearing on the floor, the weight of the assembly being compensated by a balancing device disposed between the frame structure and the board, the locking device proper comprising a pair of coplanar brake shoes encompassing the column and rigidly mounted to the frame structure; the brake shoe movements being controlled by a pedal disposed externally of the frame structure. A plate supporting two pivoted arms each connected to one brake shoes, on the hand, and to the plate, on the other hand, keeps the brake applied against the column by means of a pair of traction springs tensioned on either side of the shoes between a bearing point located on the frame structure and a traction point located on the plate.

Abstract: Furniture quality game table with multiple plane surfaces on at least three sides of a cubical game board assembly, with end panels journaled for rotation on end standards spanning the board assembly, and with endwise removable locking pins and a handle for locking the board assembly with any one of the game board surfaces in an upper horizontal position, with the handle configured to cover the locking pins from view when engaged. The typical game board assembly is rotatable on a fixed trunnion bar on which a lighting fixture is mounted for back lighting of the game board surfaces. The table includes in its lower portion a storage compartment for game pieces, playing cards and the like.

Abstract: A product display rack having a series of vertically spaced tiltable tray assemblies movable simultaneously between a first inclined position to permit gravity-fed product package loading of the shelves and a second inclined position for display and gravity-fed product package dispensing. The rack includes a hinged header which is automatically displaced upwardly when the tray assemblies are in the first position to provide unobstructed access to the uppermost tray assembly.

Abstract: A device for enabling a pivotal arrangement of a tray or table top at a seat back or back portion of a passenger seat, especially a motor vehicle seat. The device is adapted to enable an adjustment of an inclination of the tray or table top as soon as the tray or table top has been pivoted into a substantially horizontal in-use position. The adjustment may be effected by toothed segments attached to the tray and back of the passenger seat or it is also possible for effecting adjusting by setscrew arrangements devised to press against a forward edge of the tray. The setscrew arrangements may be connected to one another by a drive or connecting belt so as to enable a simultaneous operation of the setscrew arrangements.

Abstract: In a table comprising a table-top that can be adjusted in height and/or inclination relative to the trestle, and a spring arrangement provided between the trestle and the table-top and serving to counterbalance the weight of the table, the table-top (6) is connected to the trestle at its rear edge by disengageable stops and at its front edge by clamps. The spring arrangement comprises a torsion bar spring (11) mounted preferably on the trestle (1) and provided with at least two radial arms (15, 21) bearing against the trestle (1) and the lower face of the table-top (6), respectively. Such a spring arrangement is of particularly simple design and requires only little space. Further, the torsion bar spring offers a favorable spring characteristic. A particularly soft spring effect can be achieved by the use of a stack of leaf springs (31) as torsion bar spring.

Abstract: An adjustable cantilevered shelf is disclosed comprising upright supports and a shelf with a pivotally engaged bracket for supporting the shelf on the supports from either above or below. The shelf and bracket are attachable to keyhole slots in the upright supports. The relative positions of the shelf and the bracket in the keyhole slots adjusts the angle of inclination of the shelf.

Abstract: A mechanism for tilting a display screen of a CRT includes a detent gear rack molded in the side of an arch supporting therein a pivotably mounted cabinet housing the CRT. A molded detent lever is slidably attached to a side of the cabinet and is arranged to normally be in engagement with the detent gear rack.

Abstract: A drafting table having spring-balanced lifting and tilting movement features is provided with an anti-snap device which prevents the table top from tilting so quickly to the full-vertical position that it hits its stops and rocks the entire table over. The anti-snap device comprises a flexible strap which is wrapped about and fixed to cylindric members on which the table top lifts and tilts. The flexible strap becomes tight as the table top reaches its fully vertical position, but tightening of the strap is resisted by the tilt springs, which are pulled to one side by the strap. Resistance to the tightening of the strap requires more force to tilt the top to its full vertical position, increasingly slowing the tilting movement near the end of tilting travel.

Abstract: Apparatus for locking a drafting board in a desired attitude of angular adjustment enables adjustment of the drafting board through a full ninety degree movement. Force is selectively applied by a control system to interdigitating brake leaves to hold the drafting board surface from rotating once the desired angle has been achieved, and is selectively released to enable angular adjustment. Provision is made to adjust the control system of the apparatus responsive to the particular geometry of the drafting table.

Abstract: A desk assembly for mounting to and carrying by a wheelchair or the like in the location of a conventional armrest is disclosed. The desk assembly extends across the lap of the user of the wheelchair in a deployed position, folds to a relatively compact condition, and is pivotally movable to a stored position located where a conventional armrest would be provided. The desk assembly is further formed for selective locking of the desk top in various sloped orientations and movement of the desk top toward or away from the user. A reading lamp is also provided for the desk assembly.

Abstract: A keyboard is pivotally mounted on a pull out shelf to be raised from a reference position to desired angles of inclination within a range of angles, and is associated with apparatus for positively locking the keyboard following movement of the keyboard to a desired angle of inclination and its release; with the weight of the keyboard acting to maintain locking action. The apparatus effecting the locking action comprises a toothed segment whose arc and teeth define a range of angles. Associated with the toothed segment is a supporting arm biased to follow upward keyboard movement and on which the keyboard after being raised to a desired angle of inclination rests.