Abstract: In one embodiment, the invention provides a pen-based computing system. The system comprises a tablet unit including a display screen and an electronic assembly housed within an enclosure; and a separate base unit including two panels connected via a hinge, a first one of the panels bearing a keyboard, and a second one of the panels being arcuately displaceable relative to the first panel to prop the tablet unit in a viewing position in which the display screen makes a viewing angle with the keyboard of greater than 90 degrees, wherein the tablet unit and the first panel have complementary formations to prevent sliding movement of the tablet unit relative to the first panel when in the viewing position.

Abstract: The inventive technology relates to methods and apparatus for providing supplemental support for items used in manual tasks and may include one or more of the following features: a supplemental support apparatus, a supplemental support method, techniques for providing supplemental support in a compact manner, techniques for providing supplemental support in a variably-adjustable manner, techniques for correlating supplemental support to an overall workspace height, techniques for maintaining a parallel support surface through a variable-adjustment range, and techniques for retaining an item on a support surface.

Abstract: An adjustable book holder includes two primary frames, and one or more auxiliary frames selectively secured between the frames, to increase holding of more books or sheet members to the book holder. The primary frames and the auxiliary frames may be secured together with peg-and-aperture engagements. Two followers may be attached to the frames, and may be coupled between the primary frames and the auxiliary frames, and may be rotatably or adjustably secured to two seats, with gear engagements, to allow the followers and the primary and the auxiliary frames to be secured to the seats at selected angular positions.

Abstract: Described is an apparatus for adjusting the inclination of a seat squab (12) of a vehicle seat (10), wherein the device (18) has a rocker (20) with an upper and a lower rocker element (22, 24) which are pivotably movably connected together by lateral bearing bushes (36). Fixed to the upper rocker element (22) is a toothed bridge (38) with mutually oppositely disposed bridge tooth arrangements (40) which are concentric with respect to the bearing bushes (36). Provided between the two bridge tooth arrangements (40) of the toothed bridge (38) are two toothed sliders (64) with slider tooth arrangements (66). Provided between the two toothed sliders (64) is a locking member (48) rotatable about a rotary axis (26) extending through the bearing bushes (36). The two toothed sliders (64) are linearly movably guided on the lower rocker element (24) between a locking position and a release and adjusting position.

Abstract: An apparatus for a plurality of electronic devices is adapted for positioning the electronic devices in a plurality of orientations. A swivel arm is pivotably coupled to a support arm for rotation through a plurality of orientations. The electronic devices are coupled to the swivel arm by an assembly which accommodates manipulation of the electronic device along the swivel arm, as well as rotation and tilting.

Abstract: A holding device for monitors provided with displays comprises an underbody and a carrier located above it, on which carrier a monitor is applicable, the underbody and the carrier being interconnected via a mechanism that makes possible a readjustment of the monitor between different adjustment positions. This readjustment mechanism comprises such that when the carrier is manually pulled forwards/upwards relative to the underbody, the links will forcedly steer the carrier between a rear end position, in which the front end of the carrier is located near the underbody and the monitor display is oriented at a comparatively steep angle relative to a horizontal plane, and a front end position in which the carrier has been pivoted up and displaced translatorically relative to the underbody, at the same time as the display has obtained a flatter angle relative to the horizontal plane.

Abstract: A fishing pole support apparatus for connecting a user to a fishing pole to support and control the fishing pole.

Abstract: A vehicle seat mounting assembly includes a locking device mounted on an first track that moves relative to a second track. The mounting device includes a plurality of locking pawls that engage one or more slots on the second track so that the first track, and the seat, are maintained in a fixed position relative to the second track. The locking device includes a first release member for disengaging the locking device and adjusting the position of the seat. The release member includes a wedge-shaped end exerting a force on the at least one locking pawl to substantially reduce free play between the first and the second track when in the locked position.

Abstract: A sliding insert for a fishing chair includes a bottom portion; a top portion; a bearing assembly located between the bottom and top portions such that the top portion is slidable relative to the bottom portion; and a first holding plate located on a rear end of the bottom portion for attaching the bottom portion to the fishing chair by inserting the first holding plate in a backrest support located on a rear of a seat of the fishing chair.

Abstract: A power seat adjuster includes first and second side rail assemblies, each formed of a plastic outer member and a substantially tubular inner member. One of the outer member and inner member is fixed to the vehicle. The other of the outer member and inner member is movably disposed with respect to the one outer member and inner member. An elevation assembly is coupled between the movable one of the outer member and inner member and a seat support member for elevating the seat support member relative to the first and second side rail assemblies. The elevation assembly includes plastic piano-type drive hinges.

Abstract: An adjustable monitor support assembly for a monitor is positioned under a transparent portion in the top surface member of a desk-like structure. The support assembly utilizes a shelf member that is supported by laterally outwardly extending associated stub shafts. A pair of rails is provided and each one thereof is located along a different lateral side of the shelf member. The stub shafts slidably engage the rails so that the shelf member is movable relative to the rails. Retaining members for holding the shelf member at a desired location along the rails are provided. Since the rails are parabolically curved, the monitor is movable with the front face being generally perpendicular to the eye levels of various seated users.

Abstract: A tilt table is hinged along an unload side and is spring urged to swing up towards the unload side to cause parts on the table to shift against an endwall. Pin and slot connections between fixed side plates and gussets on the table structure cause a roller supported platform to which the table is hinged to shift away from the unload side, carrying the tilt table hinged side away so that as the tilt table swings up, clearance at the unload side with the upper edge of the endwall is maintained to avoid impingement into the workspace which would otherwise occur.

Abstract: A power operated seat device comprises: a pair of lower rails for fixing to a floor of a vehicle, a pair of upper rails for mounting a seat cushion of the vehicle mounted slidably on the lower rails respectively, each of the upper rails having an upstanding flange portion with a notch, a pair of brackets each of which is mounted detachably to the side of the corresponding flange portion so as to cover the notch, a rotational rod rotatably supported at both ends thereof to the corresponding bracket, a power source for rotating the rotational rod, and an adjusting the height mechanism provided between one of the upper rails and the seat cushion, and which is connected to the rotational rod and adjusts the height of a portion of the seat cushion by rotating of the rod.

Abstract: A seat construction for a vehicle includes a driver's seat angularly movable about a generally vertical axis toward a door opening formed in a side portion of a vehicle body. When a sliding driver door is opened, the driver's seat is angularly moved toward the door opening, so that the driver can easily get in and off the vehicle. An open area of the door opening, available when the sliding driver door is opened, is disposed slightly forwardly, and therefore the angle of angular movement of the driver's seat required for the driver to get in and off the vehicle can be relatively small.

Abstract: A locking device for a slide rail in a vehicle seat, and particularly for a pair of slide rails which each have an upper rail and a lower rail, said upper rail being formed by two half rail members. The locking device in the present invention includes a pair of stoppers which are slidably provided within the two half rail members respectively of the two upper rails such as to be vertically movable therein, a plurality of holes formed in the lower rails, into which holes the stopper is to be engaged, and a lever rod which is operatively connected with the stopper. Single operation of the lever rod causes engagement and disengagement of the stoppers into and from the holes for locking and unlocking of the slide rails at one time.

Abstract: A manually operable four-way automotive seat adjustment assembly is disclosed. The assembly includes a fore and aft adjustment mechanism together with a vertical adjustment mechanism that enables the seat frame member to pivot up and down relative to the carriage/base subassembly. A combination quadrant/lift link is pivotably mounted to the seat frame member and has a support pin fixedly attached thereto at a point radially spaced from the pivot point of the quadrant. The support pin is journalled to a mounting bracket that is slidably mounted to the carriage member so that the bracket can take up the fore and aft movement of the support pin as the quadrant rotates with the raising and lowering of the seat frame. The mounting bracket is preferably made of a hard plastic material to reduce noise and provide ease of operation.

Abstract: Herein disclosed is a seat slide device which comprises two slider units which are substantially the same in construction and arranged in parallel with each other, each slider unit including a lower rail adapted to be fixed to a floor member and an upper rail longitudinally slidably disposed on the lower rail and mounting thereon a seat; two lock mechanisms respectively mounted to the two slider units for locking the upper rails relative to the lower rails, each lock mechanism including a plurality of notches formed in the lower rail, a locking lever pivotally supported by the upper rail, and a pawl carried by the locking lever and latchingly engageable with the notches; and a lock releaser incorporated with both of the two lock mechanisms for cancelling the locked condition of the lock mechanisms when manipulated, wherein the lock releaser comprises two parts which are pivotally connected at their first portions to each other and secured at their second portions to the locking levers of the two lock mechanis

Abstract: In a tilt-adjustable seat cushion for a vehicle seat having an underframe receiving the upholstered seat part, two lateral frame parts for the pivotable bearing of the underframe and a tilt-adjusting mechanism operating between the underframe and the frame parts for the individual adjusting of the front edge of the seat, the manually operated adjusting shaft of the tilt-adjusting mechanism, in order to facilitate the assembly, is disposed in a separate bearing block that, after pre-assembly with the frame parts and the adjusting shaft, is connected with the underframe by screws or clips.

Abstract: A lock plate having a plurality of latch holes is connected to a stationary lower rail to extend along the same, and a latch member having latch pawls is fixed to a control rod which is rotatably held by a movable upper rail. One of the latch pawls is longer than the other, so that when the upper rail is slid to a front or rear over-travel position relative to the lower rail, the longer latch pawl is placed outside of an extreme end of the lock plate having the other shorter latch pawl placed on a land portion of the lock plate. Upon application of shock to the upper rail due to for example rapid start or rapid braking of the vehicle, the longer pawl is brought into contact with the extreme end of the lock plate faclitating latched engagement between the shorter pawl and an adjacent latch hole of the lock plate.

Abstract: An apparatus for supporting an automobile seat for longitudinal sliding including a stationary rail for mounting on the automobile, a movable rail for mounting on the seat, and roller members positioned between the rails to support the movable rail on the stationary rail. The roller members have two different diameters which respectively engage the movable rail and stationary rail for causing unequal relative movement between the roller members and each of the rails whereby the rails are of different lengths.

Abstract: The present invention provides an apparatus and method of utilization of the same of a manual vehicle seat adjuster with an overcenter locking device for the seat adjuster elevational adjustment mechanism. The seat adjuster of the present invention provides locking of the elevational adjustment mechanism independent of any spring element.

Abstract: A vehicle seat is constrained for adjustable movement in two degrees of freedom, viz., tilting and longitudinal sliding by an apparatus which includes three longitudinally-extending, laterally-parallel tracks in the outer two of which are retained a pair of followers attached to the bottom edge of the seat for guiding the seat longitudinally and for tilting it vertically thereabout. A carrier slides along the center track and is lockable in a plurality of longitudinal positions. A tilt-adjustment-arm is pivotally attached to the carrier at one end and has a second end pivotally attached to the seat generally rearward of the front edge and is lockable in a plurality of tilt positions relative to the carrier to permit the seat to be locked in one of a plurality of independent tilt positions.

Abstract: This invention relates to adjustable seats and components therefor including mechanisms for assisting in their adjustability and a hand-operated lever employed for both adjusting the inclination and height of the seat cushion above the base of the seat and positioning and moving the seat longitudinally.

Abstract: A seat comprising a seat base portion which is adjustable in respect of inclination has a seat base frame which is mounted pivotally at its rearward portion on a supporting arrangement. Disposed on the supporting arrangement in the front region thereof is a rotary shaft, with a lever arm secured to each end thereof. The lever arms are in turn pivotally connected to the seat base frame. At least one of the lever arms has a plurality of detent openings which are disposed in an arcuate array and which can be selectively engaged by a detent member carried by the seat base frame, to latch the seat base frame in the desired inclined position. The actuating lever for the detent member is disposed at the side of the seat, within easy reach of the occupant thereof.

Abstract: This invention relates to adjustable seats and components therefor including mechanisms for assisting in their adjustability and a hand-operated lever employed for both adjusting the inclination and height of the front or rear portion of the seat cushion above the base of the seat and positioning and moving the seat longitudinally to provide a six-way adjustment while permitting only one adjustment to be made at one time.

Abstract: A motor-driven seat slide mechanism comprising a cushion assembly; spaced apart, first and second telescopically extendable guide rail structures one for each side of the cushion assembly, each of the telescopically extendable guide rail structures including upper and lower guide rail members connected one above the other for axial movement relative to each other, the upper and lower guide rail members being connected to the cushion assembly and a floor panel of an automobile body structure, respectively; an electrically powered drive motor; at least one gear box including a worm gear drivingly coupled with the drive motor and a worm wheel drivingly meshed with the worm gear; a releaseable bearing assembly rigidly connected to such upper rail member of the first telescopically extendable guide rail structure; a constraint member mounted on an automobile floor panel and having a threaded bore through which the screw shaft threadingly extends; and at least one screw shaft extending in a direction parallel to th

Abstract: A lighting fixture hanging panel and bracket has a flat rigid panel having a large and small aperture therein, shaped to fix a suspended ceiling grid. The panel may be of heavy plywood for supporting a hanging light fixture. An elongated light fixture suspending bracket has a circular portion shaped to fit over an aperture in the panel with the circular portion having a plurality of threaded openings therein positioned to receive threaded fasteners from a lighting fixture being attached to the lighting fixture bracket. The lighting fixture suspending bracket circular portion also has an elongated opening therein, and a bracket electrical receptacle supporting tab fixedly holding an electrical receptacle adjacent to the lighting fixture suspending bracket elongated opening. A switch is attached to the lighting fixture suspending bracket and a pull cord extends therefrom through to the small aperture in the panel.

Abstract: The connection unit for a seat comprises guides resting on a frame fixable to the motor vehicle floor, in such a manner as to enable the seat to be supported by said floor and to undergo translational movement relative thereto, Said guides comprise a first portion arranged for fixing to the seat and to translate relative to a second portion. This latter is arranged to form a connection with said frame by way of positioning means and locking means.

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: This mount is of the type comprising two pairs of slides 1B each comprising a slide connected to the floor of the vehicle and a movable slide which carries an unlocking lever 5B mounted to rotate about a horizontal axis, and an essentially rigid member 8 for ensuring a synchronized actuation of the two levers. According to the invention, this mount comprises means 13B, 14B for allowing the pair of slides the closest to the longitudinal axis of the vehicle to tilt forwardly relative to the other pair of slides and shift therewith its lever, at least in the event of a sudden relative tilting.

Abstract: A device for positioning loads such as computer terminals or parts thereof has a pair of plates which are adjusted with respect to one another with an eccentric on a shaft between the plates which is rotated by a handle disposed outside the space between them. According to the invention, a friction brake is provided between the plates and engages the shaft to prevent undesired rotation which may vary the adjusted position.

Abstract: A resiliently suspended, tiltable and tethered vehicle operator's seat assembly which includes a sub-frame slidably mounted on a pedestal, a seat support frame resiliently supporting an operator's seat, the seat support frame being pivotally mounted about a transverse horizontal axis to the slidable sub-frame to permit the seat support frame and its resiliently mounted seat to tilt as a unit about the transverse axis; and a tether belt is connected between the seat and the slidable sub-frame for limiting the tilting movement of the seat support frame, the seat and the resilient support regardless of the position of the slidable sub-frame relative to the pedestal.

Abstract: A vehicle seat adjusting apparatus for adjusting the angle of inclination of a seat and thereby adjusting passenger height and available leg room by rotating the seat about a single, centrally located, transverse or lateral axis. A latch mechanism normally holds the seat relative to the seat track rails. Release of the latch mechanism is effected through a manual lever at the outside of one seat rail. The lever draws a release assembly laterally of the seat to slide a release arm longitudinally of the seat. The seat may then be notched to a desired position with the aid of a bias spring assisting the seat movement. Release of the lever allows the latch mechanism bias to restore the latch action in the desired position. By using a central pivot, you adjust the attitude of the seat and, by virture of the motion pattern, the rear of the seat moves up or down thus raising or lowering the occupants eye level in the vehicle.

Abstract: A seat structure has an improved means for memorizing the seat position which automatically operates a latching means provided on a seat support structure in response to the tilting movement of the seat back.The seat position memorizing means includes a rotatable plate and means for latching the rotatable plate. The rotatable plate and the latching means are mounted on a base plate of a seat back tilting means, so as to provide a more reliable operation and easy to assemble structure.

Abstract: A vehicle seat (see FIG.1) is slidably supported by two pairs of slide ra, each rail of each pair having the same cross-section. For both pairs each rail (1,2) includes a U-shaped portion and an offset flange. The flange of one rail (2) engages in the U-shaped portion of the other rail and vice versa. Ball bearings may be accommodated in a space between the two rails and a locking latch may be provided to lock the rails of one pair with respect to one another.The two rails are thus double interlocked so as to resist separation for example in the event of a road accident. Also expense is reduced because the two rails are of similar cross-section.

Abstract: A vehicle seat is mounted on the vehicle floor by a seat adjusting mechanism permitting fore and aft adjusting movement of the seat. A channel member is connected to the vehicle floor behind the seat and extends forwardly along the path of longitudinal seat adjustment movement. The channel member has opposed facing walls which are slidably engaged by a pair of wedge members having associated ramp surfaces. A seat belt is connected to the rearward one of the wedge members so that an occupant restraint load imposed upon the seat belt induces longitudinal forward movement of the rearward wedge member into locking engagement with the forward wedge member and the walls of the channel member so that the seat belt is fixed relative to the channel member and the occupant restraint load is transmitted through the channel member to the vehicle floor.

Abstract: A vehicle seat, the seat portion of which has an adjustable inclination, is supported on two concave guide rails (as viewed from the seat portion) which are supported by a seat frame and extend in the longitudinal direction of the seat portion so that the seat portion is longitudinally adjustable and can be locked in a selected position by means of a locking device. The locking device is arranged in the central section of the seat portion and includes a straight bar extending in the longitudinal direction of the seat portion. The ends of the bar are connected with the seat frame. This bar supports an adjusting member which can be adjusted steplessly in its longitudinal direction and can be secured in any position against a longitudinal movement. A coupling member is coupled with this adjusting member and is connected on its other end with the seat portion which is longitudinally adjustable on the guide rails.

Abstract: An adjustable seat bracket particularly useful in connection with vehicular seats, and a set assembly including a seat affixed to the adjustable seat bracket are disclosed. The bracket has first and second support means joined by a hinge at their respective rear portions. The bracket is provided with latch means for releasably maintaining the support members in a fixed angular relationship with each other. In a preferred embodiment, the latch means comprises a slotted catch bar projecting from one support member, and a bolt means movably attached to the other support member and adapted to engage the slotted catch bar.A seat may readily be affixed to the present bracket which is in turn easily attached to a seat support surface.

Abstract: A seat position control mechanism includes an actuating member secured to a tilting seat back and operatively connectable to an actuating member by a pawl and ratchet mechanism in order to displace the seat forwardly to an easy enter position upon forward tilting movement of the seat back. A cam and follower arrangement releases a latch for the track mechanism upon coupling of the operating and actuating members. The seat back may be moved rearwardly to an inclined position without actuation of the seat position control mechanism.

Abstract: A device for supporting a moveable seat, for example a seat in a motor vehicle, by means of sliding rails which can be displaced in their longitudinal direction on roller facilities situated between the sliding rails and stationary alignment rails, the position of the seat being set by a mechanism which arrests the movement of the seat and involves, if desired, notches on at least one alignment rail, made such that it can withstand excessive loading, at the same time being simple and inexpensive to manufacture and install. This is achieved by having both the sliding rail and the related alignment rail feature at least one flange projecting out at the side, such that the flange on the sliding rail lies a short distance below the flange on the alignment rail resulting in flanges coming into contact under overload conditions. The facing flanges feature surface projections which interlock when under load.

Abstract: A seat position control mechanism includes a pair of track members, a detent member secured to one track member and having a plurality of longitudinally spaced recesses, and a second detent member secured to the other track member and having a single recess. A pawl which is manually controlled or controlled by tilting movement of the seat back is engageable with one of the spaced recesses and a single recess to lock the track members to each other. The seat can be adjusted by operating the manual control to release the pawl from a spaced recess while remaining in engagement with the single recess to unlock the track members. Tilting movement of the seat back or use of the manual control moves the pawl out of the single recess while remaining in engagement with the spaced recess. Return of the pawl into engagement with the single recess re-establishes the seat in the initial starting position and locks the track members to each other.

Abstract: A mounting and guiding device for adjustable motor vehicle seats comprises longitudinal C-section guides in which omega (.OMEGA.)-section movable guides are slidable. The beams formed by the guides enclose a rack which is formed by a sheet metal strip fitted centrally of the C-section guide and is provided with slots. The seat frame is articulated by uprights onto brackets which are fitted to the front of the guides, and is locked by pins fixed at the rear of the guides. The device has an operating mechanism which comprises bolts engageable in the slots of the racks through the openings in the guides, and is articulated between brackets which are fixed to the rear of the movable guides. The racks are covered and the space beneath the seat is unobstructed to serve as a storage space if required.

Abstract: The invention relates to a frame for a longitudinally and height-adjustable vehicle seat, having a bracket which is pivotable about a lateral axis. This frame is supported on the lateral axis and on respective height adjustment racks which are spaced from the lateral axis on either side of the seat and extend in the pivot direction thereof. The racks each mesh with respective gears of a height adjustment drive connected with the bracket. The frame also has guide rails in which respective runners are longitudinally guided, each of which, together with a longitudinal adjustment rack, forms a structural unit. Respective gears of a longitudinal adjustment drive, connected with the guide rails, engage these racks.

Abstract: Fore and aft isolator assembly for a suspended vehicle seat permits the operator to rotate a single control lever in one direction to allow the seat to be moved to any desired fore and aft position and in the opposite direction to lock the seat in that position in either a fixed manner relative to the seat base or in an "isolate" mode where it is free to travel back and forth to a limited degree against resilient elements. The assembly permits the seat to have a very low profile limited only by the clearance required for the suspension structure. It includes an intermediate frame having a series of rack teeth which is positioned between top and bottom frames attached, respectively, to the seat upper and to the suspension. The bottom frame also incorporates a toothed rack. A rotatable adjusting shaft which is rotatably mounted to the top frame slidably supports the intermediate frame and also fixedly supports a first locking pawl which can engage a selected tooth in the rack on the bottom frame.

Abstract: A seat adjusting mechanism, arranged to be operated by an electric motor, for use with a motor vehicle seat is disclosed. The seat adjusting mechanism is supported by at least two slide tracks which extend along the length of the seat and which are placed through glide tracks each spaced away from the vehicle floor. The seat adjusting mechanism comprises at least one rack situated on one of said guide tracks and extends along the length of the guide track. The rack has one end connected by means of a connecting body to the slide track lying above it. The rack contains a long slot which has teeth formed on one side thereof for contacting a pinion which is situated to engage the teeth and is connected to an electric motor for movement of the seat adjusting mechanism. The width of the long slot in the rack serves to retain the pinion in engagement with the teeth of the slot.

Abstract: An arrangement for imparting different adjustable directional movements to an object includes a number of adjusting gear assemblies each corresponding to one of different adjustable directional movements. Each adjusting gear assembly includes a gear housing, a worm and a worm gear both supported in the housing in meshed engagement with each other. The arrangement also includes a first motion transmitting mechanism for driving the worm and a second motion transmitting mechanism for connecting the worm gear to the object to adjustably move the object when the worm gear is driven by the worm. The gear housings of the adjusting gear assemblies are constructed substantially identical.

Abstract: A vehicle seat adjustable slide structure comprises two slides, interengaging a locking lever pivotally supported by a tab cut out of the outer slide which is folded over and extends through an opening in the lever with a clearance which allows the movement of the lever between a seat locking position and a seat releasing position for movement of the seat in translation.

Abstract: In an assembly of a seat frame for an automobile seat, slide rails therefor enabling the longitudinal adjustment of the seat position, and a locking device therefor, the slide rails, particularly the upper slide rail, is contained within the seat frame, and the locking device is mounted on the seat frame.

Abstract: A locking rail supported on a fixed vehicle part for a lever pivotally connected to a seat frame of a longitudinally and vertically adjustable automobile seat. The lever receives one end of a safety belt system with a lower free end of the lever lockingly engaging the locking rail when a predetermined tensile stress on the belt strap is exceeded. The locking rail is rigidly attached to parts fixed to the vehicle such as, for example, the seat underframe and the vehicle floor. The lever is connected to the seat frame by way of a fishplate which is mounted on both sides in an articulated fashion.

Abstract: The anchoring arrangement for safety belts connected to a vertically and longitudinally displaceable vehicle seat comprises a clamping arm connected to the longitudinally adjustable guide rail and projecting toward the seat frame, a clamping lever pivotably connected to the seat frame and having one arm connected to the safety belt. The other arm of the clamping lever is provided with guiding pins slidably engaging two opposite narrow sides of the clamping arm in such a manner as to allow vertical adjustment of the seat but as to clamp the clamping arm if an excessive force is applied against the safety belt.