Abstract: An apparatus for selectively disabling rocking the swiveling movement of a rocker-swivel assembly includes a pivoting member coupled to the top plate of the rocker unit and movable into engagement with the swivel base plate to prevent rocking and swiveling movement. A linkage assembly connecting a rod rotatable by the chair user and the pivoting member provides for actuating of the pivoting member into and out of such engagement. In another embodiment, the apparatus includes a threaded stem which selectively engages the top and bottom plates of the rocker unit and the swivel base plate.

Abstract: A rotation mechanism for a rotatable seat, in 5 which four rollers are arranged at the seat such that they are disposed equidistant at 90-degree angle from one another, and a substantially isosceles triangle shaped guide member is provided at the floor side of a vehicle such that its vertex extends towards the window-side wall of the vehicle. One of the four rollers is in a rolling contact with the vertex of the guide member when the seat is set in a normal seating position. Thus, with a small rotative force, the seat can be rotated without contact with the windowside wall of the vehicle so as to orient the seat towards a desired seating direction.

Abstract: A post bushing for use in a chair assembly, seat post assembly, or other application where a tube is supported around a base. The post bushing includes a flexible umbrella member which secures the outer tube to the post, but which flexes and compresses such that a rigid collar on the bushing can receive the radial load.

Abstract: A detachable swivel mechanism is disclosed for an outdoor chair adapted for regular or reclining use. The mechanism consists of a base, adjustable telescoping support members which may be attached to many different sizes and types of outdoor chairs and swivel means to which the telescoping members and base are connected. In one embodiment, the mechanism may have a circular base having a diameter of at least the same size as the width of the seat of the chair to which it is attached, and means at the periphery of the base providing a circular track thereon. A plurality of rigid supports may be provided to hold the seat above the circular base. Roller means are used to mount the lower end of these supports for movement along the track to permit the seat to swivel, and means overlying the circular track are used to hold the roller means on the track.

Abstract: To turn a seat to a reverse position within a narrow space, a rotary seat is composed of a turntable, a thigh support frame, a hip support cushion disposed on the turntable, and a thigh support cushion disposed on the thigh support frame. Simultaneously when the thigh support frame is pivoted upwardly from an original position together with the thigh support cushion, a latch mechanism is released via a latch releasing mechanism, and the turntable and the thigh support frame become rotatable with the thigh support cushion remaining pivoted upwardly. The turntable is then latched into a reversed position when the thigh support frame is pivoted back down to the original position.

Abstract: A rotary seat for a vehicle has a seat cushion member rotably supported on a support shaft vertically mounted on the vehicle floor. Driving apparatus is connected to the seat cushion member for automatically rotating the seat cushion member between a direction toward the front of the vehicle and a direction toward a side door of the vehicle when the seat cushion member is not occupied. Disconnecting equipment is included for disconnecting the driving apparatus from the seat cushion member to allow the seat cushion member to be manually rotated when the seat cushion member is occupied. Control devices are provided for controlling the driving apparatus and the disconnecting equipment to place the seat cushion member in an automatic rotating mode or a manual rotating mode depending upon whether the seat is occupied.

Abstract: A swivel seat for a vehicle is provided with latch means which prevents the front and rear edges of the seat from being raised so as to prevent distortion of the pivot axle, the locking means and/or roller or rollers. The latch means can be actuated to its effective position, in which it prevents lift of the front or rear edge of the seat when the seat is in its normal position. Preferably, the seat also has means cooperating with rollers and a pivot axle for supporting components rotatable relative to the stationary component. The supporting means serves to hold the movable component essentially parallel to the stationary component so as to reduce the load on the rollers and the pivot axle while allowing smooth pivotal movement of the movable component relative to the stationary component.

Abstract: The arrangement, in a first embodiment, comprises a cantilevered beam which is journalled at one end of a fixed shaft and journals another shaft on the opposite end. The fixed shaft, secured to the base of a machine, has a first sprocket integral therewith, the other shaft has a second sprocket integral therewith, and an endless chain is looped about and engaged with both sprockets. Also, the other, journalled, shaft carries a seat mount to which an operator's seat is joined. The arrangement accommodates for (a) a sluing of the seat, and (b) positioning of the seat in lateral dispositions in a same attitude, or orientation relative to the machine.

Abstract: An aircraft seat formed of a container having a horizontal top surface and opposed paralleled downwardly extending sides, a seat base supported parallel to and above the container top surface, an aircraft seat being supported on the seat base, a plurality of low friction pads interposed between the container top surface and the seat base to permit the seat base to be easily moved relative to the container, the seat base and the container top having aligned openings therethrough, a shaft received in the openings and rigidly connected to a brake plate positioned below the container top, a spring urging the brake plate upwardly to lock the seat base relative to the container and an actuating member affixed to the seat base and extending over the shaft providing a mechanism for downward displacement of the shaft to thereby release the force of the brake plate to thereby allow the seat base to be moved and/or rotated relative to the container.

Abstract: The present invention provides a four bar linkage seat adjuster apparatus and method of utilization of the same. The seat adjuster includes two links pivotally and cantileveredly connected with the vehicle. A third link is pivotally connected with the first two links and is also connected with the seat. The third link has a latch which selectively sets the position of the third link with respect to the first link thereby determining the position of the seat within the vehicle.

Abstract: An improved swivel seat pedestal is disclosed. The pedestal has a swivel plate rotatable about a pivot pin secured to a fixed base plate. Two bearing clamps are secured to the underside of the swivel plate and extend under the base plate to add lateral bending, and torsional stability to the pedestal. A stop clamp is mounted under the base plate to limit rotation of the swivel plate to a predetermined range.

Abstract: A computer support includes a base member to which an inner swing arm is pivotally mounted with an outer swing arm being pivotally mounted on the outer end of the inner swing arm and supporting a platform support by a lazy-susan bearing on its outer end. The pivotal connections are provided by pivot shafts over which pivot sleeves are positioned with upper and lower spaced roller bearing sets therebetween and a low-friction load bearing sleeve of substantial hardness engaging the lower end of each pivot sleeve to support same. Brake/lock means at each pivot permits retention of the arms in any desired rotational position in separate horizontal planes of movement.

Abstract: The adjustable chair can be used in aircraft, motor homes, or the like. The chair includes a seat mounted on a base. The seat is infinitely adjustable both in translation and rotation. A locking mechanism is provided for easily and automatically locking the chair in position on the base or releasing the chair for adjustment.

Abstract: A pedestal for a rotatable seat which is hingedly connected to a base and which includes a hook part for securing the seat to the pedestal base in an upright seat position.

Abstract: A seat swivel apparatus includes a first mounting plate rotatively mounted to a second mounting plate. Each of the first and second mounting plates has a circular recess formed therein to define a pair of bearing races which hold bearing means such as a plurality ball bearings. The first and second mounting plates are held together utilizing fastening means that include a Belleville spring to provide a continuous and substantially constant biasing force on the plates to maintain them in proper rolling contact with the ball bearings. Each of the races include two arcuate sidewall portions and a connecting portion between the sidewall portions, the connecting portions being substantially flat to help prevent the bearings from tightening within the races.

Abstract: A vehicular seat for handicapped and elderly persons is disclosed which is readily accommodated in any type of conventional vehicle, such as automobile, van, bus and the like. The vehicular seat is given three degrees of freedom of movement, the first degree being a rotary one in a horizontal plane about a shiftable vertical axis of rotation, the second being a rectilinear one in a horizontal plane, and the third being rotary in a horizontal plane about a fixed vertical rotary axis. The three degrees of freedom allow for angular positioning of the seat proper relative to the ajar door, so as to ensure minimal interference between the person being seated and the frame and ajar door of the vehicle.

Abstract: A tiltable and/or rotatable support for a display device includes a cam operated locking mechanism operable to positively clamp the support in a selected swivel and/or tilt position and limiting the amount of tilt and swivel to predetermined amounts. The locking mechanism is operated by means of a lever extending through a horizontal slot in the base and is adjustable to compensate for axial tolerance build-up which could otherwise lead to malfunction. The support may be provided as a stand-alone unit or formed integral with the base of the display device.

Abstract: A tiltable and/or rotatable support for a display device which includes a locking mechanism 19, 20, 21, 22, 23, 24 operable to lock the support in a selected tilt position while still permitting swivel adjustment. The support may be provided as a stand-alone unit or formed integral with the base of the display device.

Abstract: An adjustment mechanism for an aircraft chair in which the chair can be easily and automatically locked in its adjusted or upright position, and unlocked for horizontal swiveling movement. Rotatable cam means are oriented in a locking position such that the chair seat is locked against the base. When the cam means is rotated the brakes are unlocked thereby permitting horizontal or swiveling movement of the chair seat relative to the base.

Abstract: A sliding lock mechanism for a rotary seat assembly includes an operating lever which rotates together with a seat of the assembly, thereby eliminating any operating lever projecting from the back of the seat.

Abstract: A semiautomatically actuated rotatable chair which can be rotated by the chair user from a sitting position in such chair. Such chair is comprised of a base member having integrally and fixed disposed horizontally on its upper surface a ring gear member. Moreover, said chair comprises a rotatable member with a seat on its upper portion, which rotatable member is disposed above the base member for rotation about the base member through a follower gear integrally affixed on the lower surface of the upper member.

Abstract: An eccentrically rotatable chair comprises a base having a horizontal surface and a central support fixedly secured to the base. A horizontal arm extends from the central support and is connected with the support by a longitudinally extending anti-friction lineal bearing in the arm engaging an annular flange on the central support so that the arm can move longitudinally and can rotate about the central support but is restrained from rotation about the longtudinal axis of the arm. A seat is supported at the outer end of the arm and a ball bearing at the outer end of the arm can roll in any direction on the base. With this construction the seat can be moved toward and away from the central support and can orbit around the central support but is maintained upright by the bearing connecting the arm with the central support. In one embodiment the central support is a vertical post with two annular flanges spaced vertically from one another.

Abstract: Electric floor lamp comprising a generally conical base rotatably mounted on a stationary annular base. A column is fixed on and extends upwards from the conical base. At the upper end of the column, a laterally extending arm supports a lamp and two light directing members, one above and one below the lamp. The upper light directing member includes concentric rings spaced apart to provide air circulation. Height adjustment means are provided to change the elevation of the lamp above the floor.

Abstract: A rotatable seat for a multi-passenger automotive vehicle employs a latch mechanism releasable only by manual operation of an actuating lever. The latch mechanism includes latch-and-hook assemblies at both the front and rear of the seat to prevent inadvertent rotation of the seat. In addition, the seat rotation is governed by a cam having deep recesses at the two normal sitting positions. The cam is designed with sloping faces so that the weight of the seat drives rotation towards the normal positions. An additional safety mechanism prevents rotation of the seat unless the seat back is in a position preventing passengers from sitting thereon.

Abstract: A device attachable to a wall for supporting relatively heavy articles such as television sets. The device includes a bracket mountable to the wall, a supporting arm pivotally connected at its inner end to the bracket and extending outwardly therefrom, and an article supporting platform rotatably mounted at the outer end of the arm. The bracket and arm are constructed of wood and include metal angle members and plates, respectively, for reinforcing the pivotal connection of the arm to the bracket. The arm has a wood veneer layer to cover the reinforcing plates and the bracket includes removable wood housings to cover the reinforcing angle members to provide a device having an all-wood appearance.

Abstract: A multi-directional vibration attenuator seat is capable of limited, restrained movement in any direction within a generally horizontal plane in response to vibration and other motions of the seat and the vehicle in which the seat is mounted. The limited movement is made possible by a seat arrangement in which an intermediate assembly is disposed on top of and slidable relative to a base assembly along a first axis with a seat supporting upper assembly being disposed on and slidable relative to the intermediate assembly along a second axis extending in a direction generally perpendicular to the direction of the first axis. The seat is normally maintained in and is restrained from movement out of a nominal position relative to the base assembly by a plurality of springs. A pair of shock absorbers disposed generally perpendicular to each other damp movement of the seat along the first and second axes respectively.

Abstract: A swivel rocker has a stop-swivel brake mechanism, including a seat spring operated lever, that is actuated when a chair occupant lifts his weight from the seat.

Abstract: A reversible seat includes a fixed lower frame, a selectively rotatable upper frame carrying the seat, a slot and roller connection means between the lower and upper frames selectively to permit the upper frame to be rotated relative to the lower frame to reverse the seat and locking means to secure the upper frame to the lower frame for seat use. The slot and roller connection means includes a Y-shape slot and a pivotal switch lever associated with the slot positively and sequentially to control the movement of the rollers along the respective legs of the Y-shape slot. The locking means includes a spring loaded pivotal latch on the lower frame having at least one hook selectively encircling at least one locking stud on the upper frame to bias the upper frame into positive interlocked engagement with the fixed frame at both ends of the respective frames.

Abstract: The swivel mount of the present invention provides a low profile swivel for a deep trolling reel which can be permanently secured to the deck of a vessel and provides incremental rotational adjustment of the deep trolling reel mounted thereto through 360.degree. at 45.degree. intervals in the preferred embodiment. The structure compactness is made possible by the use of interengaging locking mechanism extending upwardly from a base plate to engage a plurality of angularly spaced notches communicating with the outer periphery of an annular groove in a swivel plate pivotally mounted to the base plate. The locking mechanism is spring-loaded and includes a control handle extending outwardly from the base plate to releasably lock the deep troller in a desired position.

Abstract: An adjustable support for a display terminal is provided which comprises a novel moulded base element having a pair of concave tracks in the top and an annular recess in the bottom. The concave tracks in the top of the base are adapted to receive and support a moulded cradle element which serves as a housing for the CRT display. The annular recess in the bottom of the base receives an annular support ring which is adapted to support the base and the cradle. The three moulded elements are designed to fit together and maintain contact with each other by gravity so as to provide a low cost accurate adjustable support.

Abstract: A swivel assembly comprising a base plate, a swivel plate mounted on the base plate for rotation relative thereto, bearing elements between the opposing inner faces of the plates, and a fastener connecting the plates. The fastener comprises a bolt having a head on the outer face of the base plate, and a threaded shank extending through axially aligned holes in the plates. The fastener further comprises a nut on the outer face of the swivel plate threaded on the bolt for drawing the swivel plate toward the base plate against the bearing elements. Both the head of the bolt and the nut are freely rotatable relative to the plates, with the head of the bolt being generally accessible for being turned, and the nut being rendered generally inaccessible by an object mounted on the outer face of the swivel plate.

Abstract: A stand for television sets comprising a pair of inverted T-shaped leg sections each comprising a pair of leg members of L-shaped configuration which interengage and nest to form a four-legged base. An elongated bolt member is fixed at the head end to one of the leg sections and has a threaded end projecting beyond the top end of the base. When the leg sections are nested, the bolt is disposed in a concealed elongated cavity defined by the leg sections. A closure cap assembly is mounted at the upper terminal end of one of the vertical portions of one of the leg sections and in the illustrated embodiment forms an integral subassembly therewith. The overcap assembly has a configuration and arrangement to vertically align the leg members relative to one another and provide a certain parallelism of the parts so that all the bearing surfaces are parallel to one another and to the support surface such as a floor.

Abstract: A mobile chair for use i.e. by handicapped persons, for instance in a boat, comprises a seat and a foot-rest, and is slidable along guide rails and rotatable about a trunnion mounting the foot-rest at a base plate. The seat is carried by an arcuate guide, which in one embodiment has an extension of at least 180.degree. and is carried by guide rails above the foot-rest. In another embodiment the guide can have a full annular extension, and is then carried by supports from a base plate, slidable along two guide rails.

Abstract: Upper and lower relatively rotatable members are provided with the upper member angularly displaceable relative to the lower member about an upstanding axis. The upper member includes first front and rear portions disposed forward and rearward of the axis and a seat amount is supported and projects upwardly from the upper member. A seat support member including second front and rear portions overlying the first front and rear portions is provided and is pivotally attached to the mount for oscillation about a horizontal transverse axis adjacent the upstanding axis. The seat support member may support a seat therefrom with the front and rear portions of the seat overlying the second front and rear upper member portions and expansion springs are connected and extend between the first and second front portions yieldingly resisting upward movement of the second front portion relative to the first front portion.

Abstract: An improved suspension system for an uncrowned wheel rolling on a flat track characterized by a wheel frame assembly including a wheel frame and at least one uncrowned wheel connected in supporting relation with the frame and adapted to be seated in rolling engagement with a flat track, a load supporting bed, and a plurality of flexural struts interconnecting the bed in supported relation with the frame, each of said struts being disposed in a plane passing through the center of the uncrowned wheel surface along a line substantially bisecting the line of contact established between the wheel surface and the flat surface of the truck and characterized by a modulus of elasticity sufficient for maintaining the axis of rotation for the wheel in substantial parallelism with the line of contact established between the surfaces of the wheel and track.

Abstract: A vehicle seat support assembly including an overcenter locking mechanism with a flexible metallic band wrapped about a floor mounted support tube and connected to a seat support frame pivotal on the tube such that tensioning of the band in an overcenter manner selectively prevents pivotal seat frame movement. A locking member of the mechanism is pivotally supported on the frame for rotation about a first axis and pivotally supports one end of a link about a movable second axis with another end of the link connected to one end of the band. In a locking position of the mechanism, the ends of the link are overcenter with respect to the first axis to provide the band tensioning and consequent prevention of seat frame pivoting. A curved intermediate portion of the link between its ends extends around a pin that supports the locking member on the frame.

Abstract: A horizontal completely and freely rotatable seat about a central vertical axis, which seat has a central cylindrical socket portion having a lower larger bearing and an upper smaller bearing for a correspondingly shaped hollow bell-shaped plug with depending leg means for supporting said seat for free rotation about the plug. The bearings may be of antifriction plastic and anchored to the socket in the seat. The seat may comprise a hollow torus or donut-shaped container with a correspondingly shaped cover removably held on said container by a pair of diametrically spaced slip-cords. The slip-cords also may be used for holding the removable plug and leg means and for attaching a shoulder strap and/or belt clip for carrying the seat in its knocked-down or collapsed condition. The plug and leg means may comprise collapsible tripod legs with removable, replaceable and/or telescopic feet to best fit the surface upon which they are to rest and support the seat.

Abstract: A support assembly for the seat (32) of an electric lift truck (10) which permits the seat to be pivoted about a vertical support member (24) and slid outward to move the seat clear of the truck's battery compartment (12). The means for pivoting the seat includes a first latch (44) which normally keeps the seat from rotating relative to the support member (24). The seat is mounted on a sliding mounting assembly (30) which allows the seat to be slid outward of the truck, and which also includes a latch assembly (68) for normally maintaining the seat in an operating position.

Abstract: A rocker box for furniture and the like, comprising: a rockable top plate having two pairs of parallel laterally-spaced outer-depending side and inner-depending supplementary flanges containing perforations cooperatively providing four pivot-receiving openings on a common transverse axis, one outer side and one inner supplementary flange being located at each of the opposite sides of the box, each inner supplementary flange being spaced inwardly from the corresponding outer side flange so as to cooperate therewith in delimiting an interposed upper flange space; a non-rockable bottom plate having one pair of parallel laterally-spaced outer upright side flanges, one for each upper flange space, each upright side flange projecting upwardly from the bottom plate into the corresponding upper flange space where it is parallel to the corresponding depending side and supplementary flanges, said pair of upright flanges cooperatively providing two more pivot-receiving openings on said common transverse axis; and a pair

Abstract: An adjustable seat assembly particularly adapted for a mobile vehicle which permits the seat to be moved fore-and-aft, laterally side-to-side, vertically and rotationally. A latch is provided for selectively preventing and permitting rotation of the seat and other portions of the seat assembly relative to a fixed pedestal. A projection is mounted to the bottom of the seat at a predetermined aft position and predetermined lateral position. Guide means such as a rigid barrier is positioned to abut the latch release projection and slidably guide the seat toward the predetermined lateral position as the seat moves toward the predetermined aft position, thereby directing the release projection to the latch and permitting the seat to be released for rotation by pushing the seat aft from any lateral or longitudinal position.

Abstract: A furniture swivel unit includes a base plate, a swivel plate positioned over the base plate, and a one-piece bearing located between the two plates. The base plate has an upwardly turned flange at its periphery, and the bearing, which may be molded from a low friction polymer, rests on the base plate along the flange. The swivel plate has a downwardly directed hub, the center of which is open to accommodate a retaining washer that is secured against the base plate and overlies a portion of the swivel plate, thus preventing separation of the two plates. The hub, moreover, projects into and seats against the bearing with the arrangement being such that the bearing takes both radial and thrust loading.

Abstract: A seat is supported in a vehicle by a swivel platform which is clamped to a base in such a manner as to be free to turn but which, at the same time, is tied to the floor of the vehicle by straps so as to prevent the platform from pulling loose from the base during a collision. An axially slit and radially split bearing ring supports the platform for turning on the base.

Abstract: A knock-down pedestal chair is easily assembled from metal frame and base components and upholstered back and cushion components requiring only a small shipping carton and a few screws, bolts and nuts for assembly of the components into the finished chair. The metal components can be mounted in close relation on a plating rack for easy electroplating in standard plating facilities. The pedestal base has a pair of planar leg components each composed of two diametrically opposite legs connected by an interposed slotted plate. The slots of the plates of the two components interfit to hold the components at right angles to each other. The tops of the legs are easily bolted to the bottom plate of a swivel plate component, the top plate of which is bolted to the bottom of the seat component and side arm components are bolted to the sides of the seat component and are fastened to the back component to complete the chair assembly. Casters may be mounted under the four legs of the base.

Abstract: A seat supported on a fixed pedestal with a mount assembly operable to permit rotational movement of the seat about an upright axis, longitudinal fore and aft movement and transverse tilt movement of the seat. The mount assembly has a base member pivotally connected to the pedestal for movement about an upright axis. A first lock pin locks the base member in a fixed forward position. When the lock pin is released the base member can rotate about a generally horizontal axis. A pair of longitudinally located track assemblies are pivotally connected to the rear portion of the base member. The forward portions of the track assemblies are held in selected elevated positions with releasable locking arms thereby changing the tilt position of the seat. The track assemblies also have movable carriages that can be locked in selected longitudinal positions to adjust the fore and aft position of the seat.

Abstract: A swivel pedestal for a vehicle seat is provided in which a vertical tube is secured at its lower end to a base member and at its upper end is supported by a horizontal top wall of a housing, the tube receiving a tubular shaft rigidly secured to and depending from a rectangular mounting plate adapted to be secured to the other side of a vehicle seat. A brace plate is secured to the mounting plate and has a horizontal portion between the mounting plate and the housing top wall, with a cam portion for camming the upper end of a lock bar outwardly, terminating in a V-shaped notch receiving a V-shaped locking portion of the lock bar, the lock bar being pivoted at its lower end on a horizontal axis and being spring-urged inwardly, and an actuating handle being secured to the upper end of the lock bar. A stop is provided for limiting angular movement of the brace plate and for insuring alignment of the lock bar with the notch at the locking position.

Abstract: An improved apparatus for supporting a frame for pivotation of the frame relative to a selected axis of pivotation. A plurality of connectors are attached to the frame at pivot support points on the frame, and the connectors are supported by a plurality of bearing posts that are arranged in a determined geometric relationship such that each connector is movable on its respective bearing post along an axis of travel, the axis of travel for each of the connectors passing through a common travel axis convergence point. The determined geometric relationship further directs the frame to have a positional reference mode in which all of the pivot support points are positioned on the circumference of a reference circle that intersects the axis of pivotation at an initial pivotation center, the initial pivotation center being located at one end of a reference diameter of the reference circle, and the travel axis convergence point being located at the other end of the reference diameter.

Abstract: Swivel apparatus for a chair or the like comprising nonmetallic bearing members rotatably supporting a swivel plate. The bearing members are mounted in fixed positions on a support and each has a laterally disposed arcuate groove located in interfitting engagement with a circular projecting extension on the chair mounted swivel plate so as to rotatably support the swivel plate.

Abstract: A "centerless" swivel bearing for chairs and the like in which the two facing, relatively rotatable members are each in sliding contact with an interposed lubricating liner on a ring of substantial diameter defining a central opening in the bearing. One of the two members is necked through the opening of the other and then turned radially outwardly to maintain the assembly of the three constituent parts against loading tending to separate the two members.

Abstract: A pair of relatively rotatable face-to-face metal swivel plates centrally secured together adjacent the common center axis and arranged along their respective margins for respective securement to an article and the base. A continuous circular V-shaped bearing race is formed in one metal plate to extend concentrically about the center axis and spaced a substantial distance therefrom. A frictionless plastic bearing material is not only interposed between the metal plates with its opposite sides engaging opposite plates for bearing and spacing purposes but is also curved arcuately to conform to the circular curvature of the race. One side of that material is V-shaped to extend into and conform to the V-shape of said race sufficiently along the length of the race for centering one plate. The opposite side of that same material and the other metal plate mutually cooperate to provide complementary centering means.

Abstract: Alignment of a mask and a semiconductor wafer to be processed is effected by orthogonal and angular movements of the mask singly and in combination. A carrier for the mask is supported on four orthogonally positioned transducers which, when actuated to elongate or contract, produce carrier translational movement in either or both orthogonal directions and/or rotational movement by selective elongation and contraction of one or more transducers. Actuation of the transducers and the alignment are obtained by signals from a feedback system including photon detection and multiple frequency oscillation utilizing alignment marks on the mask and the wafer.