Abstract: A headrest of a motor vehicle seat can be folded down into an inoperative position. The headrest has a headrest body and a headrest bracket which are mechanically connected in such a manner, via a bearing part having a sliding bearing and a pivot bearing that a vertical displacement and a pivoting about a horizontal pivot axis arranged perpendicularly to the longitudinal axis of the vehicle are achievable.

Abstract: An adjustable headrest for a vehicle includes a headrest body and at least one support arm extending downwardly from the headrest body. The support arm is shaped and dimensioned for positioning within the seat back of an automobile. A tilt assembly is positioned within the headrest body. The tilt assembly couples the headrest body to the support arm in a manner permitting relative movement between the headrest body and the support arm. The tilt assembly includes a lower bracket assembly fixedly coupled to the support arm and an upper bracket assembly fixedly coupled to the headrest body. The upper bracket assembly is pivotally coupled to the lower bracket assembly for controlled movement relative thereto. The tilt assembly includes a cam arm permitting actuation thereof between a locked position and a release position, wherein the cam arm may be actuated from either side of the headrest body.

Abstract: Articulating/folding head restraint assemblies that include modular brackets that function as modules and allow for platformability and customization by varying auxiliary components. The modular brackets can be molded or cast using conventional manufacturing processes, and are designed to receive and/or house various components of the assembly such as pivotal head restraint supports, pivotal shafts, locking assemblies, etc. The modular brackets are designed to integrate a number of components that are typically separate in prior art devices and have to be individually assembled together.

Abstract: A vehicle seat with a headrest for a vehicle is formed from an impact cushion and installed upon a seat back. The headrest is pivoted around a stationary pivotal axle aligned transversely to a longitudinal axis of the vehicle and can be swung from an unused position against the force of a spring into a used position. In the used position, the headrest is held stationary by a toggle linkage, which, within its self-limiting swing zone, acts as a pivoting element between the impact cushion and the pivotal axle.

Abstract: The invention relates to a headrest for a vehicle, a method for producing a headrest, and a vehicle seat comprising a headrest. The headrest is provided with a body (2) and a holding element (3). A filling material (23) is provided between a connection part (22), used to connect the holding element (3) to the headrest body (2), and a cover (21). The connection part (22) and the cover (21) define an essentially tight space in relation to the filling material (23) when the filling material (23) is in the essentially liquid processing state thereof.

Abstract: The present invention relates to a head rest for a vehicle seat in a motor vehicle. The head rest consists of an attachment (8) arranged on top of the back rest of the vehicle seat, a protective cushion (4) and one or several supporting arms (5, 13) which protrude from the attachment and support the protective cushion (4). The supporting arms are at their one end (7) pivotably attached to the attachment about a lower pivoting shaft (9), and the attachment exhibits a locking mechanism which in its use position for the head rest holds the locking arms pivotable locked about the first pivot shaft relative to the attachment. A release mechanism can, when activated, release the locking mechanism for pivoting of the supporting arms together with the protective cushion about the pivot shaft.

Abstract: A headrest-attached vehicle seat is provided in which a headrest is provided over a seat back. In the headrest-attached vehicle seat: the headrest includes a headrest body, and a neck-support portion which is provided under the headrest body; and the neck-support portion turns around a pivot which extends in the seat-width directions inside of the headrest body and moves in the front-and-rear directions, and the neck-support portion is positioned at a predetermined turning angle.

Abstract: Mounting device for a headrest with two headrest rods for a vehicle seat, which includes a first guide sleeve for the height-adjustable accommodation of a first headrest rod, a second guide sleeve for the height-adjustable accommodation of a second headrest rod, and a first receptacle device secured in the backrest, in which the first guide sleeve is held and rests at at least two axially spaced bearing points. A second receptacle device is secured in the backrest, within which the second guide sleeve can be shifted at least in the transverse direction. The second guide sleeve rests in the second receptacle device, which is secured in the backrest. Advantageously, the second guide sleeve is pivotably held in the second receptacle device, which is secured in the backrest, and the second headrest rod is pivotably held in the second guide sleeve.

Abstract: A body-supporting device includes a tray, a net and a frame. The tray includes a margin and a groove in the margin. The groove gets narrower downwardly. The net includes a margin. The frame includes a first rib for inserting the margin of the net into the groove of the tray and a second rib for pressing the margin of the net against the margin of the tray. The first rib gets narrower downwardly. Fasteners are driven into the first rib of the frame through the margin of the tray. The sandwiching of the margin of the net between the first rib of the frame and the margin of the tray gets firmer as the fasteners get tighter in the first rib of the frame.

Abstract: An amusement device, in particular a roller coaster, for providing a sense of excitement to one or more passengers using the amusement device. The amusement device has an elongated track along which one or more amusement device seat assemblies adapted to carry the one or more passengers are moveable. Each seat assembly has a seat with a seating surface and a back support with a back support surface. The seat assembly further includes a bar construction attached to a pivot mechanism. This bar construction has a hip bar and one or more pivot arms integral with the hip bar, which bar construction is pivotable about the pivot axis from a raised position in which the hip bar is raised from the seating surface to allow a passenger to sit down in the amusement device seat assembly, to a lowered position. The bar construction is such that no part of the bar construction takes away the view of the person and limits the movements of the arms of the person, allowing the passenger to experience a great sense of freedom.

Abstract: A vehicle seat includes a seat part, a backrest, and at least one shell structure comprising a plastic material and having foam padding on a side on which an occupant sits. The at least one shell structure is arranged on frame parts provided on at least one of the seat part and the backrest, the frame parts comprising a metal material.

Abstract: The invention relates to a backrest for a vehicle seat, with a head support (1) which is adjustable in terms of the height of the head support (1) with respect to the backrest, and with a proximity sensor (5) for detecting the head position of a person sitting on the vehicle seat in relation to the head support (1), an indication for adjusting the head support (1) in the event of a mispositioning and/or an adjustment of the head support (1) by means of an electric drive (4) out of an initial position taking place until the head of the person sitting on the vehicle seat causes a triggering of the proximity sensor (5), the proximity sensor (5) being arranged in the upper part of the head support (1) and being directed downward onto the region of greatest curvature of the back of the head of the person sitting on the vehicle seat.

Abstract: A vehicle seat comprises a seat back frame having a pair of side frames, a seat spring mounted between the side frames, a single plate-shaped flexible cushion plate mounted to the seat spring, a seat back cushion provided in front of the cushion plate, a single plate-shaped flexible auxiliary plate mounted on the cushion plate. The auxiliary plate is located between the cushion plate and the seat back cushion. The auxiliary plate pushes the seat back cushion to the front by being forwardly bent in response to an operation member. A collision detector is located on the rear side of the cushion plate having a predetermined distance therebetween.

Abstract: In its preferred form the invention provides adjustable stretching apparatus for stretching the back, shoulders, and/or the neck, in order to assist with postural and vertebral alignment. A preferred apparatus includes a seat, a headrest positioned above and behind the seat, and a convexly curved reasonbly hard, rigid form separating the seat and headrest. The curved form includes a longitudinal channel defined between two ridges, within which channel the spine is supported when in use. The support is preferably rigid. Provision of legs to raise the apparatus above the ground, and provision of varable head rests and seat, greatly improve the applicability of the apparatus in amelioration of a variety of postural and vertebral alignment problems.

Abstract: The invention relates to a seat, in particular an aircraft passenger seat (1), comprising seat components such as a backrest (9), seat section (5), seat frame, seat cushion and cover material and seat attachment parts such as a headrest (15), armrest and footrest. At least one of the seat components is equipped with at least one guide web (17), along which a seat attachment part (15) can be displaced and fixed in a friction fit in a predetermined position.

Abstract: Apparatus for connecting together two objects comprises: a body for attachment to a first object and having a concave surface and a corresponding convex surface; a clamp for attachment to a second object and having a first jaw and a second jaw moveable relative to the first jaw, the first and second jaws being configured to engage respectively the concave and convex surfaces of the body when applying a clamping force thereto, wherein at least one jaw comprises at least one tooth configured to bite into the body as the clamping force is applied, thereby resisting movement between the body and the clamp. A chair, in particular a wheelchair for disabled persons, has one or more rests mounted on apparatus as detailed above.

Abstract: The sheath for receiving a head-rest branch includes at least one wedge disposed in a window formed in a wall of the sheath and adapted to be disposed between the bushing and the branch, said wedge having a thickness greater than that of said wall so that, when the sheath is housed in the bushing and the branch is received in the sheath, the wedge is compressed between the bushing and the branch.

Abstract: In a bored headrest, a garnish includes a front garnish and a rear garnish that are attached to a through-hole of a skin member in front and rear directions of the through-hole to seal an opening. The front garnish has a first holding portion that can hold a first skin edge portion, and a first connecting portion formed at a near side to the rear garnish. The rear garnish has a second holding portion which can hold a second skin edge portion, and a second connecting portion formed at a near side to the front garnish. The rear garnish has a second connecting portion. Therefore, a bored headrest is provided having a high quality of appearance and whose quality of appearance can be kept constant.

Abstract: A head restraint assembly for use with a vehicle seat, the head restraint assembly having a head restraint armature that is adapted to be attached to a seat back, including two spaced apart support posts, a cushion surrounding the head restraint armature and a strap that is affixed to the head restraint armature, the strap extending between the two spaced apart support posts. The strap is also surrounded by the cushion.

Abstract: An adjustable headrest that provides both support and comfort to the user and one that can be used in connection with various types of passenger vehicles. The headrest includes slide means for permitting easy height adjustment of the headrest and also includes means for adjusting the headrest forwardly and rearwardly. Further, the headrest includes easily adjustable, wing-like, side-support members that are pivotally connected to a centrally located, vertically adjustable head support member by means of specially designed hinges.

Abstract: A foamed product integral with trim cover assembly, of the type having a frame element provide therein, with two local portions of the frame element projecting outwardly therefrom. The trim cover assembly used has two extensions, with an opening defined therebetween. Both two extensions are bent to and juxtaposed on one cover material portion thereof, thereby forming a three-layer portion therein. The three-layer portion is sewn so as to define an unsewed region therein. The unsewed region has two spaced-part through-holes formed therethrough, hence providing two spaced-apart continuous through-hoes. The two local portions of frame element are inserted through the respective two spaced-apart continuous through-holes, so that the unsewed region is stretched horizontally to keep the corresponding portions of the juxtaposed two extensions and cover material portion in close contact with one another.

Abstract: A system and method installing and removing a headrest from a seat is disclosed. The system and method include provisions for installing a headrest to a seat without the use of tools and for preventing the removal of the headrest during normal operation. The system and method can also include provisions for removing the headrest by operating an internal locking device.

Abstract: The present invention discloses a pillow cushion having a main body, and the main body includes a headrest portion, an accommodating portion and a neck rest portion. The headrest portion is concavely disposed on a top side of the main body and coupled to a front side of the main body, with an end extended to the top side, and another end extended to the front side. The accommodating portion is concavely disposed on the front side of the main body and both lateral sides of the headrest portion. The neck rest portion is concavely disposed on the front side of the main body with an end coupled to another end of the headrest portion, and another end proximate to the front side of the main body for supporting heads of different sizes and providing comfortable supports to the head without leaning towards a side of the pillow cushion.

Abstract: An active headrest includes a panel inside a seat frame, a panel link supporting the panel and rotating in response to raising of the panel, and a frame which is raised by the panel. A self locking device of the active headrest includes: a guide cylinder in the seat back frame, defining a receiving indentation therein; a return spring in the receiving indentation; and a locking piston in the receiving indentation, a first end of the locking piston being coupled to the return spring, and a second end of the locking piston being exposed to outside the guide cylinder, wherein the locking piston is kept in the guide cylinder by the panel link at the non-operated position of the active headrest, and pressed outside of the guide cylinder by the return spring to restrain rotation of the panel link at the operated position of the active headrest.

Abstract: Head restraint supporting structure of the present invention is such that a head restraint bracket supporting a head restraint is secured to a seat back frame, a stay of the head restraint being inserted into the head restraint bracket. Wherein the head restraint bracket is formed into a tubular shape by joining two end portions of a plate material having been bent, and is secured to the front face of the seat back frame so that junction between the two end portions abuts against the seat back frame. A reinforcement structure is formed at the upper end of the junction. This reinforcement structure prevents the upper end of the junction from being opened by a load being applied to the head restraint, thereby allowing the head restraint 9 to restrain reliably the rearward movement of occupant's head and hence to reliably protect the occupant's neck.

Abstract: This is a device to provide massaging stimulus to a driver of an automobile. Massaging heads are installed in the headrest of the car or truck or any moving vehicle to provide stimulus to the base of the skull or the back of the neck of the driver in order to insure that the driver remains alert.

Abstract: A headrest device, kit and associated method is disclosed for use in mounting the device onto a top part of a backrest of a chair in a vehicle. The device comprises a headrest post, a first swath of fabric, a plastic sleeve, a second swath of fabric, and a cushion. The headrest post has a generally U-shape configuration with a generally rectangular base and two substantially parallel prongs extending from the base of the headrest post for insertion into the backrest of the chair of the vehicle. The first swath of fabric is attached to the rectangular base of the headrest post and has an exposed surface. The plastic sleeve is detachably attached to the rectangular base of the headrest post. The second swath of fabric is attached to the plastic sleeve, and has an exposed facade. The second swath of fabric is detachably attached to the first swath of fabric when the exposed facade of the second swath of fabric contacts the exposed surface of the first swath of fabric.

Abstract: A neck rest for a seat of an automobile has a neck rest body which includes a neck rest cushion and at least two neck rest rods connected with the neck rest body, the neck rest rods being accommodated in the back rest of the seat. Each of the neck rest rod has a support portion attached thereto. The neck rest body includes a housing which has a front wall and a rear wall, the cushion being attached to an outer side of the front wall and the rear wall, with the support portion being located in the housing between the front and the rear walls. The housing is moveable between a basic position and an extended position.

Abstract: An automobile seat having a seat cushion, a seatback, and a headrest is disclosed. The headrest includes a stay and a headrest main body. The stay is generally U-shaped and is detachably coupled to the seatback. The stay includes a generally horizontal portion having an axis. The headrest main body is rotatably coupled to the horizontal portion of the stay and includes a receiving port for receiving the horizontal portion of the stay. The headrest main body rotates around the axis of the horizontal portion of the stay. The receiving port is located at a position that is coaxial with the axis of the horizontal portion of the stay.

Abstract: A headrest support system comprises a seatback support frame having an upper cross member adapted to support a headrest. The cross member has opposite top and bottom surfaces with axially aligned holes formed therethrough. A headrest guide sleeve is received through each of the axially aligned holes formed in the cross member to coupled the headrest to the support frame. The holes include outward extending flanges defining an inner contact surface for engaging and supporting the headrest guide sleeve.

Abstract: A foamed product integral with trim cover assembly, of the type having a frame element provide therein, with two local portions of the frame element projecting outwardly therefrom. The trim cover assembly used has two extensions, with an opening defined therebetween. Both two extensions are bent to and juxtaposed on one cover material portion thereof, thereby forming a three-layer portion therein. The three-layer portion is sewn so as to define an unsewed region therein. The unsewed region has two spaced-part through-holes formed therethrough, hence providing two spaced-apart continuous through-hoes. The two local portions of frame element are inserted through the respective two spaced-apart continuous through-holes, so that the unsewed region is stretched horizontally to keep the corresponding portions of the juxtaposed two extensions and cover material portion in close contact with one another.

Abstract: The invention relates to a headrest (10), particularly for a motor vehicle seat. At least on element is provided that can be displaced relative to a retaining device (12) of the headrest (10). The at least one element can be displaced, in part and/or in total, about at least one horizontal rotation axis and/or at least one vertical rotation axis and can be locked in selectable displaced positions.

Abstract: A head restraint system for an automotive vehicle seat includes a headrest carried upon eccentric mounting posts which may be extended telescopically from a seatback and rotated about their base axes so as to reposition the headrest not only vertically, but also horizontally. A sensor mounted in the headrest feeds back the location of an occupant's head to a system controller.

Abstract: A head restraint guide system is provided to reduce or eliminate contact points between an armature of a head restraint and a housing in a vehicle seat assembly. The housing extends through a seat back frame. In a first embodiment, a retainer is secured to the housing and a washer is seated within the retainer. A retaining cap closes and maintains the washer within the retainer. The armature extends through the guide system contacting only the washer, thus eliminating vibrations and noise due to contact between the armature and the attachment tube. The washer comprises a non-rigid material, preferably felt. In a second embodiment, an elongated sleeve comprising a non-rigid material, preferably felt, is seated within the housing. The sleeve receives and surrounds the armature to eliminate contact points between the armature and the housing, thereby eliminating vibrations and noise therebetween.

Abstract: A headrest height adjustment device includes a base member fixed on a seatback of a seat body, a pulley rotatably supported by the base member, the pulley being rotatable in a first direction by unwinding a first end of a rope member wound around the pulley and winding a second end of the rope member in conjunction with sliding movement of the seat body, and the pulley being rotatable in a second direction by winding the first end of a rope member and unwinding the second end of the rope member in conjunction with sliding movement, a rotational arm rotatably supported by the base member and rotated by the pulley by a rotation transmission member, and a conversion member engaged with the rotational arm for operating a headrest in an upward or downward direction by converting rotational movement of the rotational arm into linear movement.

Abstract: A head restraint assembly comprising a frame assembly including a retention member. A pillow coupled to the frame assembly with the pillow configured to allow access to the retention member. A cover assembly having a back end and a front end envelopes and conforms to the shape of the pillow with the cover assembly including a flat strip member coupled to the back end and a barb strip member coupled to the front end of the cover assembly. The flat strip member and the barb strip member couple with each other in the retention member closing the cover assembly over the pillow. Also, a method for making a head restraint assembly.

Abstract: Headrest-mounting-tubes are attached into the seatframe of an automotive seat. Headrest-posts engage the mounting-tubes, and support the headrest. The headrest-posts need to be orientated correctly, and so have a key that engages a keyway in the mounting-tube. The keyway is formed as a keyway-pocket, being punched from the open end of the tube. Preferably, the keyway-pocket is punched after the mounting-tube has been attached into the seatframe.

Abstract: A vehicle seat assembly includes a seat back frame having an aperture extending therethrough, and a head rest guide tube disposed in the aperture. The guide tube has a radially extending swaged portion engaged with the seat back frame for securing the guide tube to the seat back frame.

Abstract: A head rest for vertically supporting a person's head while in a seated position wherein the person's head defines left and right sides is provided. The head rest may comprise a first inflatable compartment sized and configured to receive the left side of the person's head. The head rest may also comprise a second inflatable compartment connected to the first inflatable compartment. The second inflatable compartment may be sized and configured to receive the right side of the person's head and have a mirror configuration of the first inflatable compartment. The first and second inflatable compartments may be isolated from each other such that the first and second inflatable compartments are independently inflatable. The head rest may also comprise a connecting strap attached to the first and second inflatable compartments for connecting the first inflatable compartment to the second inflatable compartment.

Abstract: A removable adjustable head rest for wheelchairs for providing users of wheelchairs with much needed back and neck support. The headrest includes a hollow cylindrical main portion, a pair of handle sleeves, and a head rest portion. The hollow cylindrical main portion has a generally inverted T-shaped configuration, a horizontal segment, and a vertical segment. A pair of handle sleeves are attached to the horizontal segment of the hollow cylindrical main portion. A head rest, having two integrally coupled adjustable side portions, is removable coupled to the vertical segment of the hollow cylindrical main portion. A neck roll removable coupled to the head rest.

Abstract: Headphone storage concepts provided include (i) a headrest forming a compartment configured for storage of an item within the compartment; (ii) a headrest cooperatively configured for receiving headphones such that the headphones are removably secured to the headrest; (iii) a headrest having earphones pivotably attached thereto; (iv) a seat forming a compartment (in wing bolsters or in an underseat, rearward-opening drawer) for storage of an item; and (v) headphones with rotatable earphones to provide a slimmer profile for storage.

Abstract: A head restraint system for use with a vehicle seat and configured to cushion the head of a seat occupant in a lateral direction relative to the vehicle seat is disclosed. The head restraint system generally includes a head restraint cushion configured to be supported at a lateral side of the vehicle seat and at a position that is perpendicularly fixed relative to the vehicle seat. The head restraint system also includes a support member having a first end for supporting the head restraint cushion and a second end for coupling the head restraint cushion to the vehicle seat. The head restraint cushion includes at least one missing portion for allowing improved peripheral communication by the seat occupant.

Abstract: Vehicle seat includes a seat portion and a backrest having a height-adjustable headrest. To facilitate the height adjustment of the headrest, two retaining rods are fit into nonreclining sleeves, and have spaced apart arresting notches on a lower portion of the retaining rods. The headrest can be set at any height by use of a locking mechanism on the upper surface of the backrest. The locking mechanism includes a base nonrotably secured to the backrest that includes a base portion and a spaced apart covering portion. The base portion and covering portion are connected via a central pillar to form one piece. The locking mechanism includes a spring with an arresting arm and a retaining arm configured to be mated with respective walls of the column, and biased by a bulge on the column. A cover ring having engaging elements engages the base, and may have spaced apart engaging fingers.

Abstract: A sleeve arrangement for a neck rest, including a sleeve body adapted to be inserted into an opening in a frame of a vehicle seat, the sleeve body having a through going axial passage adapted to accommodate a rod of the neck rest, and the sleeve body having further a head portion which includes internal locking elements to fix the axial position of the rod in the sleeve body and a shank portion joining the head portion, the sleeve body having an external side which includes fixing elements the sleeve body in the opening of the frame, wherein in upper and lower end portions the passage has radially annular enlargements, and a preferably radially expandable sliding bushing of anti-frictional plastic material is accommodated by the enlargements which encircle the rod, and an elastomeric material is accommodated in the intermediate space between the sliding bushing and a wall of the passage.

Abstract: A headrest is supported by a first rod and a second rod, the first rod being equipped with a series of positioning notches on a first side and a retaining notch on a second side. In operation, the two rods are installed into two channels in the seat, one of the channels being equipped with a headrest guide assembly. The headrest guide assembly includes a button that allows the user to selectively engage the series of positioning notches on the first side of the first rod so that the headrest can be positioned as desired. However, the headrest guide assembly will automatically engage the retaining notch on the second side and thus prevent the headrest from being removed from the seat. To remove the headrest, a tool can be inserted into a notch in the button and to insertion of the tool prevents the headrest guide assembly from engaging the retaining notch on the second side and thus the headrest can be removed.

Abstract: A motor-vehicle headrest has an upright mounting rod adapted to be anchored in a vehicle seat back and an upright rear wall at an upper end of the rod and forming part of a rear forwardly open housing shell. An upright front wall forming part of a front rearwardly open housing shell is spaced forward of and directly forms with the rear wall a cavity containing the upper end of the rod. The front wall is formed by a pair of side portions unitary with each other and each forming a wing. Membrane hinges between and formed unitarily with the side portions pivot the side portions about at least one upright axis. Upholstery surrounds the portions of the front wall.

Abstract: A passenger seat for a vehicle, including a frame for being attached to a floor of the vehicle, a fixed backshell attached to the frame, and a seat back attached to the backshell. A seat bottom is attached to the backshell, and a headrest assembly attached to the backshell at a position above the seat back. The headrest assembly includes left and right spaced-apart side wings, each of the side wings comprising a rigid support and a wedge-shaped cushion attached to the rigid support by a pivot. The left and right cushions are each translatable in a direction parallel to the rigid support to selectively increase or decrease the effective width of the headrest assembly by increasing or decreasing the distance between the left and right side wings. The left and right cushions are each mounted for rotation about the pivot for selectively changing the angle of a forward face of the cushion relative to the rigid support to thereby permit selection by a seat occupant of a desired cushion position.

Abstract: A headrest for a motor vehicle seat is crash active in that it has a mechanism for automatically bringing the head-engaging member toward the head of the passenger in the case of a crash. This mechanism includes a slide guided on a pair of cylindrical members surrounded by springs and having a tooth-forming part of a return travel lock preventing return of the slide to its starting position. In that position a releasable coupling device has a primary coupling element engaged with a secondary coupling element which may be a hairpin-shaped bent wire.

Abstract: In the case of a head restraint (1) for a vehicle seat, in particular for a motor vehicle, having a fixed first subassembly (11), a moveable second subassembly (13), and a drive (15), which is normally retained by a locking unit (21), moving the second subassembly (13) forward relative to the first subassembly (11), the locking unit (21) has a clamping magnet.

Abstract: An occupant seat of a motor vehicle includes a backrest, and a headrest mounted atop the backrest on a pair of posts. The headrest includes a base portion supported by the posts, and an occupant-engaging contact portion that is supported by the base portion for relative translational movement along a pair of tracks defined on the base portion. In response to a suitable control signal, such as the tensioning of a Bowden cable in response to an applied force, the contact portion moves under the control of an articulated linkage against a return spring bias and away from the base portion. The translational movement of the contact portion relative to the base portion serves to control contact surface inclination throughout the range of movement of the contact portion relative to the base portion.