Abstract: A submergible stool includes a body having a top, a bottom spaced from the top, and a sidewall extending between the top and the bottom and defining an enclosed interior cavity extending between the top, the bottom, and the sidewall. A first aperture is formed in the sidewall proximate the bottom and extends from the enclosed interior cavity to an exterior of the stool. A second aperture is formed in the sidewall proximate the top and extends from the enclosed interior cavity to an exterior of the stool. The apertures are positioned such that when the stool is placed in a body of water, water will flow into the interior cavity through the first aperture, air will be forced out of the second aperture, and the stool will sink to a bottom of the body of water in an upright position.

Abstract: An aerial workstation which comprises a seat having a sitting portion, a backrest that is connected by a first articulation that allows the backrest to pivot relative to the sitting portion, and an arm configured to position the seat in various positions and orientations in space as required. The aerial workstation makes it possible to be able to translate the seat in a cockpit in an introduction direction, and to make it pivot about a pivot axis that coincides with the direction of introduction within the cockpit.

Abstract: A submergible stool includes a body having a top, a bottom spaced from the top, and a sidewall extending between the top and the bottom and defining an enclosed interior cavity extending between the top, the bottom, and the sidewall. A first aperture is formed in the sidewall proximate the bottom and extends from the enclosed interior cavity to an exterior of the stool. A second aperture is formed in the sidewall proximate the top and extends from the enclosed interior cavity to an exterior of the stool. The apertures are positioned such that when the stool is placed in a body of water, water will flow into the interior cavity through the first aperture, air will be forced out of the second aperture, and the stool will sink to a bottom of the body of water in an upright position.

Abstract: A group of seats for a passenger aircraft, which is configured as a rotating group of seats and by rotating the group of seats about the rotation axis a relocation of the position of the group of seats in relation to the initial position in the aircraft cabin is simultaneously achieved. The group of seats has a seat frame and at least one seat element. A support plate for fastening the group of seats to the aircraft structure is furthermore provided, the support plate having a rotating element which rotatably connects the support plate and the aircraft structure, the rotation axis of the rotating element being positioned in the region of the front half of the seat element, wherein the support plate is capable of being fastened to the aircraft structure by way of quick-release locks.

Abstract: The invention relates to a passenger compartment (20) of a vehicle (10) comprising at least one seat (14, 15, 16, 17) and comprising a console (18) that can be placed laterally adjacent the seat. The particularity is that at least one seat (14, 15) is designed to be adjustable such that it can be moved out of a first position in which it faces in the travel direction, and into a second position, and that at least part of the console (18) is mounted so as to be movable out of a primary position in which it is laterally adjacent the seat, into a secondary position in which it is outside the movement path of the seat during movement of the seat between the first position and the second position.

Abstract: A passenger seating arrangement for use in an aircraft cabin, the passenger seating arrangement comprising a column of seat units arranged in an inwardly facing herringbone. Each seat unit is configurable between a seating configuration and a flat-bed configuration. Each seat unit has an access opening for accessing the respective seat unit. At least one of the seat units is configurable into a disabled-access configuration in which an access opening is temporarily widened by moving part of a foot-receiving structure, for enabling a disabled passenger to access the seat unit.

Abstract: A vehicle seat device comprises: a seat disposed at a vehicle width direction inner side of a side door of a vehicle; a rotating mechanism that rotates the seat about a vertical axis relative to a vehicle body; a sideways movement mechanism that moves the seat in a vehicle width direction relative to the vehicle body between a normal region and an inner region; and a control device which, when causing the rotating mechanism to rotate the seat, causes the sideways movement mechanism to move the seat from the normal region to the inner region before the rotation.

Abstract: In the present invention, there is a single seat pedestal for supporting two seats without further support comprising a tubular pyramid capped with a plate and supporting two arms at right angle to one another.

Abstract: A stair lift comprising a rail which is mounted along the staircase, at least partially at an angle to the horizontal plane, and a frame which is movable along the rail, on which a chair is mounted, which frame is provided with support and drive means that engage the rail, wherein the chair is rotatable about a vertical axis relative to the frame between two extreme rotated positions, wherein the chair comprises a seat on which a person can be seated and wherein the chair comprises a footrest on which a person seated on the seat can rest his or her feet, wherein the seat and the footrest are rotatable at mutually different angles about the vertical axis.

Abstract: A vehicle seat having a seat shell, includes a first upper rail, which is arranged on the tunnel side and is movably guided in a first lower rail, and a second upper rail, which is arranged on the sill side and is movably guided in a second lower rail. The first upper rail can be displaced relative to the second upper rail, and due to that displacement the seat shell carries out a rotation about a vertically extending pivot axis. A main memory device is provided on the second upper rail, and at least one spring unit is provided, which acts upon the first upper rail relative to the second upper rail in the longitudinal direction.

Abstract: The present invention relates to adjustable desks and chairs for audiovisual classrooms. It comprises a turntable, at least a desk and at least a chair. The turntable is installed on the floor of an audiovisual classroom. The desk is installed on the turntable. The chair is installed on the turntable and in proximity to the desk. The turntable can rotate the desk and the chair together to any desired angle, thereby increasing the convenience of using an audiovisual classroom.

Abstract: A seat for a vehicle constructed so that a side seat is provided on an opposite side of a center seat may include a first hinge shaft to which a center seat back of the center seat may be rotatably coupled for folding the center seat back forwards, a second hinge shaft to which a side seat back of the side seat may be rotatably coupled for folding the side seat back forwards, and a folding actuator assembly selectively engaging the side seat back with the center seat back, wherein the folding actuator assembly locks the center seat back to the side seat back when the side seat back may be folded, and releases the center seat back from the side seat back to fold only the center seat back when the center seat back may be folded.

Abstract: A multi-swing chair apparatus comprising a top frame member, one or more frame leg members, and one or more suspension assemblies is provided. The top frame member is, for example, a generally circular top frame member. The frame leg members are rigidly connected to and extend from the top frame member. Each of the frame leg members defines a space for suspending one or more swingable chairs from the top frame member. The suspension assemblies are pivotally attached to the top frame member. Each of the suspension assemblies connects to one of the swingable chairs for suspending each swingable chair from the top frame member. The suspension assemblies facilitate one or more of swinging movements and swivel movements of the swingable chairs. In an embodiment, the multi-swing chair apparatus further comprises support members extending upwardly from the top frame member for supporting a canopy.

Abstract: Described herein are embodiments of seating with an eccentric swivel that pivots to change the orientation of that seat. The seating with an eccentric swivel includes an eccentric pivot and other support structures that stabilize the seat as it pivots.

Abstract: A vehicle seat, an adjusting system and a method for moving at least one vehicle seat arranged in a vehicle cabin, particularly an aircraft seat, comprising seat components that are coupled or guided together, such as a seat part, a backrest and a leg rest, the location and/or inclination of which can be adjusted by means of at least one or more adjusting units. The adjusting system allows a separation of the basic functions from driving devices, with an electronic device for collision-free movement and for adjusting custom-designed functions and facilitating the adaptation of the custom-designed functions. The movement sequences and movements of the respective individual seat components and the seat components in relation to one another and the movements of the components or seats within an environment or group of seats are accomplished by means of a movement model in a coordinate system.

Abstract: An infant carrier device comprises a foldable support frame, an adjustable backrest assembly, a backrest positioning mechanism including a fixed positioning member and a movable latching member connected with the backrest assembly, and a disengaging mechanism connected with the support frame and movable relative to the positioning member. The latching member is movable between a first position where the latching member is engaged with the positioning member for locking the backrest assembly in position, and a second position where the latching member is disengaged from the positioning member. Moreover, the disengaging mechanism is operable to interact with the latching member for causing the latching member to move from the first position to the second position when the support frame is folded.

Abstract: A vehicle seat, an adjusting system and a method for moving at least one vehicle seat arranged in a vehicle cabin, particularly an aircraft seat, comprising seat components that are coupled or guided together, such as a seat part, a backrest and a leg rest, the location and/or inclination of which can be adjusted by means of at least one or more adjusting units. The adjusting system allows a separation of the basic functions from driving devices, with an electronic device for collision-free movement and for adjusting custom-designed functions and facilitating the adaptation of the custom-designed functions. The movement sequences and movements of the respective individual seat components and the seat components in relation to one another and the movements of the components or seats within an environment or group of seats are accomplished by means of a movement model in a coordinate system.

Abstract: A vehicle child seat includes a primary backrest with a hollow passageway formed therein. A headrest is vertically adapted between raised and lowered positions, and has a lower portion housed within the passageway and an upper portion disposed above the primary backrest. An auxiliary backrest is connected to the primary backrest, and is articulated rearwardly of the primary backrest when the headrest is raised. A base section is coupled to the primary backrest and has a hollow chamber formed therein, and further has a trapdoor connected to an anterior end thereof. A baby seat section is removably housed within the chamber and adaptable between vertical and horizontal positions about a fulcrum axis defined anterior of the primary backrest. The baby seat section and the trapdoor are independently and simultaneously pivotal so the caregiver can quickly extract the baby seat section from the chamber.

Abstract: In a seat and a maneuvering cabin for telescopic lifts, the seat comprises means for translating, predisposed to translate the seat forwards and backwards along a determined translation direction, and means for rotating, predisposed to rotate the seat about a rotation axis. The maneuvering cabin comprises: a frame for containing and supporting the cabin; at least a transparent front surface which is solidly constrained to the frame, through which an operator can observe outside the cabin in a frontal direction; a roof comprising a transparent portion, which transparent portion is contiguous to the front surface, through which an operator can observe outside the maneuvering cabin in an upwards direction through a predetermined angle of vision, and a non-transparent reinforced portion which is contiguous to the transparent portion; a maneuvering seat located internally of the frame and positioned below the reinforced portion of the roof facing the front surface.

Abstract: A seat system for a vehicle, includes a first pair of slide rails and a second pair of slide rails arranged on a vehicle compartment floor so as to extend in a front-rear direction of the vehicle, a first seat and a second seat arranged alongside each other, a forward-rearward movement mechanism provided under each of the first and second seats and supported at each of the first and second pairs of slide rails so that each of the first and second seats is movable along each of the first and second pairs of slide rails, and a sway mechanism provided between each of the first and second seats and the forward-rearward movement mechanism and swayably supporting each of the first and second seats at least in a direction where each of the first and second seats is approaching another of the first and the second seats.

Abstract: A submersible table and seat assembly suitable for use in a swimming pool. The submersible assembly includes a base, a table, and seats. The base has a hollow interior capable of being filled with a flowable material in an amount sufficient to enable the submersible assembly to rest on the bottom of the swimming pool. The table and the seats are supported on the base and adjustably connected to the base to enable the table and seats to be raised and lowered relative to the base, so that the table and the seats are adjustable to accommodate varying depths of the swimming pool. Fluid passages are present within the base and/or the seats, jets are fluidically coupled to the fluid passages, and a conduit is connected to the fluid passages for flowing a pressurized fluid through the jets.

Abstract: A swivel seat device is disclosed for bringing an individual adjacent to a table without moving or lifting the chair the individual is seated upon includes an upper supporting member eccentrically pivotally interconnected to a lower supporting member whereupon the individual sits on the upper supporting member that is eccentrically rotated so that the individual is brought adjacent and forward to the table without ever moving the chair. The lower supporting member is secured to the seat rest of the chair by flexible straps that wrap around both the chair seat rest and the lower supporting member for attachment beneath the chair seat rest. The upper supporting member can also include a semi-circular backrest upwardly extending from the periphery of the upper supporting member to provide further support for the individual seated thereon.

Abstract: A multiple chair workstation especially suitable for barbers, hair stylists, dentists, and the like. The workstation comprises a base having a centrally mounted client chair. A revolving floor surrounds the client chair, and an operator's chair is mounted on the revolving floor. The base has a vacuum system for collection of cut hair and other debris, along with air conditioning and lighting. Controls mounted in proximity to the operator chair permit control of the revolving floor and the vacuum and air conditioning. Both chairs may be vertically adjustable, as controlled from the operator chair. Additional controls may include a reclining back on the client and/or operator chair. Various utilitarian appendages such as footrests, armrests, tool trays, storage boxes and the like may be provided on the chairs.

Abstract: A controllably rotatable seat having an arm to which one or more seats are attached. The arm is rotatably connected to a carrier. An electrical motor, pneumatics, hydraulics, or any other mechanism that is well known in the art for producing rotation rotates the arm and, consequently, the seat or seats. Initiation of rotation and returning of the seat or seats to their original orientation is accomplished by a timer, a sensor detecting targets, or the measurement of some physical criterion associated with movement of the carrier. Preferably, a lever arm connects the arm to the means for rotating so that the point of rotation of the means for rotating will be substantially aligned with the center of gravity of a participant sitting on the seat.

Abstract: A unit is described, consisting of an oblong table and a plurality of seats arranged approximately the same distance apart around the perimeter of the table. The unit includes elements designed to move the plurality of seats along en masse around the perimeter at a predetermined speed.

Abstract: A seat arrangement (2) includes seat segments (4, 5) which constitute a seat base arranged to rotate at least about a pivot corner (7) and possibly about a secondary pivot corner (10) in order to improve access through a door aperture (6) adjacent to the seat arrangement (2) to the rear of the arrangement (2). Thus, the seat arrangement (2) could constitute a bench-type configuration incorporating a driver's seat (3) which extends across the width of a motor vehicle and thereby increasing the available seating capacity of that vehicle. Additionally, through the increased access to the rear of the seating arrangement (2) the motor vehicle will be more convenient in terms of allowing vehicle occupants to sit in rear seating (1) or gain access to vehicle luggage space.

Abstract: A chair includes a base, a seat supported on the base and defining right and left sides, and an armrest. The armrest includes an armrest support rotatably supported under the seat on a bearing mechanism on the base for 360.degree. of movement around the seat, including movement to positions adjacent the right and left sides of the seat. The seat is slidably supported on the base for movement between a forward use position and a rearward position, the rearward position permitting increased clearance in front of the seat for adjustment of the armrest, but the seat being normally biased toward the forward position by a spring device. The base includes a control for supporting a reclineable back.

Abstract: A plurality of seating units, each of which may have two or more seats on a common frame, can be connected to a central support by plug connectors. The central support has a support column and a housing which can be clamped together upon angular adjustment to allow the seating units to assume various angles relative to one another. The central column can accommodate an approximately round table.

Abstract: Clearance in the seat base to which a post is pivotally mounted provides for wide-angle rotation of post-mounted equipment that is supported by the post that is mounted to the base. The location of the pivot axis is such that the mechanisms employed for pivotally mounting the equipment to a dental chair do not protrude from the back of the chair.

Abstract: A detachable step stool for a barber's chair for providing seating and step-up for a barber or hair stylist to use while working on a client's hair, the detachable step stool for a barber's chair comprising a cantilevered swing arm rotationally connected to the vertical support post of a barber's chair, the swing arm having a padded stool seat removedly rotationally connected to its free end such that the stool seat may rotate and revolve around the barber's chair whereby a user may sit on the stool seat while styling the hair of a client seated in the barber's chair, and a step whereupon the user may stand to facilitate reaching high areas of a client's head.

Abstract: A top plate (12) with a padded cushion (18) is pivotably mounted on a bottom plate (16) . The padded cushion (18) is fixed in position on the top plate (12) by an integral rigid retaining ring ( 20) , with inner beading (34) of the retaining ring (20) extending in a clamping fashion beneath outer beading (26) of the top plate (12). An annular groove (22) close to the outer edge of the top plate (12) means that the remaining annular wall (24) with the marginal beading (26) is only connected to the top plate (12) via a thin bridge, said bridge constituting an articulation zone (28), so that, when the retaining ring (20) is lifted off, the annular wall (24) functions as a flexible tongue and can be moved elastically inwards.

Abstract: A haircut work station provides a customer chair and a complementary operator seat which is movable in a generally circular arc about the customer chair. The operator seat is supported by a support member upon a swinging arm extending radially outward from a below-floor center post. The operator seat support member penetrates the floor through a narrow, semi-circular travel arc slot about the customer chair. The operator seat may move in and out relative to the customer chair, and may rotate about its own vertical axis. A lift assembly enables vertical movement of the operator seat relative to the floor and customer chair, A frame may be used to connect the center post, lift assembly, and floor. A vacuum line may extend through the customer chair support member to a remote vacuum system.

Abstract: A seating system capable of being put into a variety of configurations which include wheelchair locations. The seating arrangement is made up of two-chair and three-chair units in which at least one fixed chair is included within each unit. Stowable chairs are attached by hinges to the fixed chairs and can be moved from stowed positions behind the fixed chairs to use positions between the fixed chairs. Latches are used to hold the stowable and fixed chairs in a row while in their use positions. Hinges allow planar horizontal rotation of the stowable chairs to their stowed positions.

Abstract: Pivot-mounted on a bottom plate (12) is a top plate (14) which supports an upholstery pad (16), the latter being secured by a retaining ring (18) around the circumference of said top plate (14). The top plate (14) has an outer rim with a polygonal contour so that the retaining ring (18) only engages under said top plate (14) at the polygon corners. This gives rise to a number of clamping zones arranged at intervals around the circumference, between which there are permanent cavities. The retaining ring (18) can thus be easily removed, by local deformation, from the top plate (14) to enable the rotatable seat (10) to be cleaned.

Abstract: The present device relates to a new design of beauty salon chair, particularly a flexible multi-direction beauty salon chair that can move in different directions automatically, primarily driven by control circuits connected to sets of guiding rod. That the working chair of cosmetician or hair stylists can move in different directions through circuit control is the main characteristic of the present invention. Professionals in cosmetology can avoid longtime standing while working with the above described invention.

Abstract: A rotary plate (14) is mounted on an oblong bottom plate (12) in a manner which permits the former's longitudinal displacement.The bottom plate (12) features a number of transverse grooves (46) extending over its full width, between which grooves (46) are formed articulating webs (48) at the bottom and top face of the bottom plate (12) around which articulating webs (48) adjacent strips of the bottom plate (12) can be folded relative to each another. The bottom plate (12) forms in the area of the articulating webs (48) a multi-member belt or band with a sprung flat-shape recovery action. The rotary plate (14) features a central pin (36) which can be moved from a locked position into an unlocked position and vice versa. In the locked position, the pin (36) engages in a hole (30) of the bottom plate (12) to prevent the rotary plate (14) from further displacement.

Abstract: A compactible, storable seating apparatus of the type which yields way to accommodate a wheelchair user. The apparatus has a seat bottom and seat back which rotate about a common axis to compact in a vertical position. The seat bottom and back are mounted to a common cantilevered beam which is pivotal about a single stanchion. The seating apparatus can be used in a conventional manner or can be easily pivoted about the stanchion to yield way to a wheelchair user.

Abstract: An apparatus including a central seat rotatably mounted to selectively confront one of an annular array of desks positioned about the seat. The desks are mounted to an upper ring, wherein a lower ring concentrically positioned below the upper ring provides a foot rest for an individual positioned within the seat. The seat is mounted upon a dampener member to accommodate bouncing of an individual upon the seat structure. The desks are removably mounted relative to the upper ring to accommodate various positions and desks for securement to the upper ring.

Abstract: A seat assembly which is revolvable about a vertical axis comprises a seat cushion, a seatback and an armrest. A pair of armrest holders are secured to both sides of the seat cushion respectively. Each armrest holder is constructed to detachably hold the armrest. The armrest has a rechargeable vibrator disposed inside the armrest. And, the armrest is supported by two metal rods and recharged through the rods.

Abstract: The present inventon is a convertible sofa, bed and dinette facility that is designed for use in various compact areas having limited space such as commonly found in mobile recreational vehicles, and the facility being defined by two furniture units that together are adapted to be selectively arranged for use as a sofa, a bed or a table assembly. Each furniture unit comprises a frame structure having a main frame section and a secondary extendible frame section. Each furniture unit is releasably secured to a wall structure for any one of the selective arragements. One furniture unit is adapted to be rotatably slidable from one wall position to an adjacent wall. The other furniture unit is adapted to be rotated from one wall to another in such a manner as to be correspondingly arranged to the oppositely disposed furniture unit so as to define a selective mode of use while located in a given compact space.

Abstract: A storable seating unit for access by an individual in a wheelchair to seating in a stadium or arena. The storable seating unit includes a pedestal, a seat bottom pivotally connected to the pedestal, and a seat back pivotally mounted to one end of the seat back and the pedestal. The pedestal includes a mechanism for pivoting the seat bottom and the seat back so as to define an open area for positioning of the wheelchair in a position occupied by the seat bottom and the seat back prior to pivoting. The pedestal may include a longitudinal slot and a slide pivotally and slidably positioned therein and connected to the seat bottom and the seat back for pivoting of the seat bottom and the seat back and lowering thereof along the length of the slide.

Abstract: A rotary device for front seats of a motor vehicle enables both a driver seat and a front passenger seat to be rotatably capable of taking an ordinary forwardly facing position and a rearwardly facing position. The device includes a first detection switch provided in the driver seat for electrically detecting the position of the driver seat, a second detection switch provided in the passenger seat for electrically detecting the position of the passenger seat, a first rotation control provided in the driver seat for preventing or permitting the operation of a rotation release lever of the driver seat, and a second rotation control provided in the passenger seat for preventing or permitting the operation of the another rotation release lever of the passenger seat.

Abstract: A rotary table (10) provided as a seat for a handicapped person consists of a bottom plate (12), a cover plate (14), a cushion mat (16) and a fastening ring (18). The cover plate (14) is mounted for rotation at the bottom plate (12) and is in sliding contact therewith. The cushion mat (16) is removably fastened at the cover plate (14) by the fastening ring, which is composed of a plurality of identical ring segments (19) which are individually locked at the cover plate (14) and can be removed by manually exerting a lifting force thereon. All components of the rotary table (10) can be separately cleansed and re-assembled thereafter without needing tools.

Abstract: A swivel seat and frame which includes a pair of individual seat frames secured to a base. At least one of the seat frame is slidably and rotatably attached to the base to allow the seat to be rotated 90.degree. or more.

Abstract: A portable boat seat for releasable attachment to a transverse boat thwart or any like horizontal supporting structure having opposing edges. A seat member is attached to a main frame by a turntable for rotation about a substantially vertical axis relative to the main frame and a supporting thwart. The main frame includes a pair of parallel, spaced apart longitudinal channel members to the upper surface of which is attached the turntable. Secured transversely across an end portion of the channel members is a first grasping member. A second and opposing grasping member is secured to a pair of slide members slidably engaging the channel members for relative longitudinal sliding movement. A coil spring biases the grasping members toward each other. Extension of the main frame against the spring permits the grasping members to be positioned adjacent and outside the opposing edges of the thwart.

Abstract: A swivel mount support apparatus for supporting a power tool or the like comprising a base plate which may be secured to a workbench or a wall in the vicinity of a work area and a support plate on which the tool may be secured. First and second elongated generally S-shaped members are pivotably coupled to both the base plate and the support plate such that the support plate carrying the tool may be pivoted about the base plate in order to position the tool in an out-of-the-way location for storage or to a convenient work location for use.

Abstract: A chair system particularly useful for a dental office or other operatory wherein the head region of a subject is to be treated by a dentist or other operator, comprises a subject's chair for seating the subject in an upright position; an operator's chair for seating the operator in an upright position facing the subject; and a mounting for mounting the operator's chair at a higher elevation than the subject's chair such that the legs of the operator straddle the legs of the subject when both are seated in their respective chairs. The chair system further includes a vertically-extending barrier between the operator's chair and the subject's chair terminating below the head region of the subject when seated in the subject's chair, separating the operator from the subject but permitting free access by the operator over the top of the barrier to the head region of the subject.

Abstract: The invention relates to a variable seating arrangement with a plurality of seating elements which are supported by at least two approximately horizontal support elements (1, 1') the adjacent ends (1a, 1'a) of which are connected to one another in a common connecting column (4) and are pivotable relative to one another about a vertical shaft (6). In this way an extremely large number of arrangements and groupings of the seating elements relative to one another are possible.

Abstract: A doctor-patient seating arrangement as might for example be used by a chiropractor during examination of a patient's back is disclosed in a form having a single base or pedestal from which a pair of upright seat support members extend with each upright member providing a degree of vertical adjustability to its respective supported seat. The seats themselves are of the backless variety, i.e., stools with the patient's stool being swivelable centrally about its upright support member while the doctor's stool is supported on an obliquely extending arm so as to be movable in an arc around the other upright support member. The other upright support member is located near the patient's back so that the doctor may move in an arc about the patient examining the sides as well as the central portion of the patient's back.

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.