Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
  • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
  • B60N2/427—Seats or parts thereof displaced during a crash
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/80—Head-rests
  • B60N2/806—Head-rests movable or adjustable
  • B60N2/865—Head-rests movable or adjustable providing a fore-and-aft movement with respect to the occupant's head
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/80—Head-rests
  • B60N2/888—Head-rests with arrangements for protecting against abnormal g-forces, e.g. by displacement of the head-rest
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
  • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
  • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
  • B60N2002/0204—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable characterised by the seat or seat part turning about or moving along a non-standard, particular axis, i.e. an axis different from the axis characterising the conventional movement
  • B60N2002/022—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable characterised by the seat or seat part turning about or moving along a non-standard, particular axis, i.e. an axis different from the axis characterising the conventional movement the seat or seat part turning about or moving along a vertical axis

Definitions

• the invention relates to a headrest for a vehicle seat, in particular for a motor vehicle seat, with the features of the preamble of claim 1.
• a headrest of this type is known from DE 39 00 495 AI.
• the distance between the occupant's head and the headrest is reduced to avoid whiplash injury (cervical spine syndrome).
• the invention is based on the object of improving a headrest of the type mentioned. This object is achieved by a headrest with the features of claim 1. Advantageous refinements are the subject of the dependent claims.
• the headrest is preferably designed for a rear crash, but can also be designed accordingly in the event of a front crash.
• the headrest can be part of an automatic headrest adjustment system, ie the height of the headrest is automatically adjusted via the longitudinal adjustment of the vehicle seat.
• the headrest takes its highest position in the rearmost position of the vehicle seat, and its lowest position in the foremost position. If necessary, the height of the headrest can be adjusted manually.
• the first assembly is preferably movable relative to the second assembly (forward) and the second assembly is movable relative to the third assembly (upward).
• the movements can be purely translatory, superimpositions of a translational and a swivel movement or superimposition of two swivel movements. In the latter case, a translatory movement can be generated again, for example, by means of sliding guides.
• lever arms are advantageous, with which relatively long distances can then be covered.
• the different movements can be better controlled by separate energy stores, gears and guides, but shared triggers.
• a safety lock for triggering the crash-active headrest is preferably provided for blows to the headrest which occur outside the crash.
• a freewheel is preferably provided as such a lock, which locks a pivoting device which is also moved, so that it serves as a support.
• a freewheel can also be provided in a vehicle seat, on the backrest of which, in the event of a crash, an upper part of the backrest provided with a headrest swivels forward from an initial state relative to a lower part of the backrest, the freewheel then blocking a pivoting movement of the upper part to the rear.
• the freewheel can, for example, be effective between the pivoting device and a headrest rod and can preferably be activated again at a certain height on the headrest rod, for example in a section of smaller diameter.
• FIG. 1 is a perspective view of the first exemplary embodiment from obliquely the front in the triggered state
• FIG. 2 shows a representation corresponding to FIG. 1 without padding in the initial state before the baffle plate is installed
• 3 is an exploded view of the components of the height lock in a perspective view obliquely from the front
• FIG. 6 is a perspective view against FIG. 2 obliquely from behind in the initial state
• Fig. 7 shows a section along the line VII-VII in Fig. 6 in the triggered state.
• FIG. 10 is a schematic view of a vehicle seat
• 12A is an exploded view of the components of the second and third subassembly of the second exemplary embodiment, viewed from the left front,
• 12B is an exploded view of the components of the first assembly and the connection to the second assembly, viewed from the left front
• 13 is a partial view of the second exemplary embodiment in the area of the impact body locking device, as viewed from the right.
• a headrest 1 for a vehicle seat is attached to two headrest rods 5 inserted into the backrest 3.
• the following directions refer to the arrangement of the vehicle seat in a motor vehicle and its usual direction of travel (x direction).
• the headrest 1 is designed in a manner known per se to be displaceable in height (z direction) relative to the backrest 3 and can be locked by suitable locking means. The initial state or state of use of the headrest 1 is described below.
• each headrest rod 5 With the upper end of each headrest rod 5, an annular stop sleeve 7 is, for example, pinned or integrally formed therewith.
• a hollow cylindrical guide sleeve 9 is provided inside the headrest 1, into which a washer 11 and a compression spring 13, referred to below as a compression spring 13, and the headrest rod 5 are inserted from below.
• the two guide sleeves 9 are mounted on a height lock 15.
• the height lock 15 arranged in the transverse direction of the vehicle seat comprises an elongated lower part 17 with two passages 17 'for the headrest rods 5, an elongated slide 19 arranged on the lower part 17 along this, which has two slightly elongated passages 19' for the headrest rods 5, and two block-like upper parts 21, which are screwed to the two ends of the lower part 17, are each provided on the mutually facing sides with a forward-facing locking hook 23 and have holes 21 'for the passage of the headrest rods 5.
• the upper parts 21 and the locking hooks 23 can be formed separately or in one piece, wherein the lower part 17 can also be formed in one piece with the upper parts 21.
• the upper parts 21 are so far from the lower part 17 by means of grooves 21 "in the area of their bores 21 'that within these grooves 21" the slide 19 is displaceable in the longitudinal direction within the dimensions of its passages 19' for the headrest rods 5.
• the slide 19 can interact via the edges of its passages 19 'with corresponding notches 5' in the headrest rods 5 in order to lock them.
• the guide sleeves 9 with the headrest rods 5 are inserted into the height lock 15 to such an extent that the slide 19, which is pulled somewhat to the left in the y direction, engages in the lowest notch 5 '.
• the latching position of the slide is changed and the height of the headrest 1 is thereby set.
• a swiveling device 25 with its tubular swiveling sleeve 25 ' is slid onto each guide sleeve 9 for swiveling mounting.
• each swivel device 25 has a passage-like locking receptacle 28, which in the initial state of the headrest 1 points inwards and is swiveled over the locking hook 23, so that the swivel device 25 is locked.
• the slightly offset swivel arms 27 of the two swivel devices 25 face one another in the manner of folded hands, crossing one another.
• the swiveling device 25 carries at its upper end a driver 29, which has a clip ring 29 'encircling the swivel sleeve 25', which engages in a groove of the swivel sleeve 25 'by means of a nose, and a driver bolt 29' 'projecting radially from the clip ring 29'.
• An essentially cylindrical guide tube 31 provided with two longitudinal grooves 31 'is arranged horizontally in the transverse direction of the headrest 1 (y direction). Its left end is closed. From the open, right-hand end, a shim 33 is inserted into the guide tube 31, hereinafter referred to as a swivel Compression spring 35 designated compression spring and a sliding block 37 introduced.
• the sliding block 37 is arranged with a cylindrical section inside the guide tube 31 and is guided by a tongue and groove guide in the longitudinal direction of the guide tube 31 and projects forward with a radially projecting, smaller cuboid section from a corresponding, approximately the right half of the guide tube 31 provided recess of the guide tube 31 out.
• the position of the adjusting disk 33 within the guide tube 31 can be adjusted, for example, by an adjusting screw which is screwed into a threaded bore on the end face of the guide tube 31.
• the guide tube 31 preassembled in this way is pushed with its longitudinal grooves 31 ′ into a laterally slotted base plate 41 and fixed by two clamps 43.
• the base plate 41 can also be formed in one piece with the guide tube 31.
• a left rack 45 and a right rack 46 are movably guided in the transverse direction of the headrest 1 (y direction).
• the left rack 45 and the right rack 46 are mounted on a left rack guide 47 and right rack guide 48 connected to the base plate 41.
• a rack cover 49 arranged in front of the two racks 45 and 46 and fastened to the base plate 41 holds the two racks 45 and 46, which are slightly offset in height, in contact with the base plate 41.
• the rack guides 47 and 48 and the rack cover 49 can each be made in one piece the base plate 41 may be formed.
• a sliding block adapter 51 which is connected to the cuboid section of the sliding block 37, is welded or integrally formed on the right-hand end of the left toothed rack 45.
• a left driver adapter 53 is welded or integrally formed on the left end of the left toothed rack 45 which is arranged on the outside and in whose opening 53 'the driver pin 29 "of the left pivot device 25 engages to form a kind of articulated connection.
• On the right end which is arranged on the outside Right rack 46 is welded to a right driver adapter 54 or formed in one piece, in the opening 54 'of which forms a kind of articulated connection of the driving pins 29 "of the right-hand pivot device 25.
• a bearing bush 57 is inserted, in which a shaft 61 of a pinion 63 is rotatably mounted.
• the pinion 63 is arranged between the two racks 45 and 46 so that the left rack 45 engages with its upward-facing toothing in the pinion 63 on its underside and the right rack 46 with its downward-facing toothing in the pinion 63 on the latter Top engages.
• a ratchet wheel 65 is slid on the rearward-facing free end of the shaft 61 arranged on the back of the base plate 41 and fixed by means of a pin.
• the ratchet wheel 65 has a sawtooth-like toothing which is clockwise with respect to the x direction and into which a pawl 67 engages from above.
• the lever-like locking hook 67 is pivotally mounted in a bearing block 69 mounted on the rear side of the base plate 41 via an angle piece on the left end of the guide tube 31.
• a locking hook spring 71 is arranged around a pin of the locking hook 67, which is clamped between the guide tube 31 and the locking hook 67 and thereby prestresses the locking hook 67 and toward the locking ratchet wheel 65 in the closing direction.
• a two-part, cuboid-shaped bolt guide 73 is attached, within which a bolt 75 is movably guided in the z direction.
• the bolt 75 protrudes through an opening 31 ′′ in the guide tube 31 in the latter and thus holds the sliding block 37.
• the bolt 75 has at its upper end a transverse axis 77 arranged in the y direction and a ball bearing 79 on the left and right thereof
• Mass sensor 81 is mounted on a bow-shaped mass carrier 83, which is pivotally mounted on the bolt guide 73 via lateral bearing journals 85 with its two free legs
• a curved locking link 87 is attached centrally on its underside, which bears on the ball bearings 79 of the locking bolt 75.
• a locking spring 89 between the locking guide 73 and the locking bar 75 biases the latter upward (z direction), it being held by the locking link 87.
• Stops 91 on the bolt guide 73 limit a later described pivoting movement of the mass carrier 83 together with the mass sensor 81 during the transition to a triggered state.
• Two return springs 93 which are provided between a front attachment 95 on the base plate 41 and a rear attachment 97 on the mass carrier 83, ensure that the mass sensor 81 is reset to the initial state after a possible pivoting movement.
• a baffle plate 101 pointing forwards (x-direction) and arranged in a y-z plane is movably attached to the pivoting devices 25.
• the angled ends of the swivel arms 27 are suspended in scenes or other slide guides on the back of the baffle plate 101.
• a padded and covered, front cushion body 103 is attached to the front of the baffle plate 101, while a likewise padded and covered, rear cushion body 105 is attached to the back of the base plate 41.
• the support frame of the cushion body 105 can be formed in one piece with the base plate 41, and optionally also in one piece with the guide tube 31.
• the front upholstery body 103 and the rear upholstery body 105 abut against one another, enclosing the components described above, and thus enable the headrest 1 to be used as intended.
• a first assembly of the impact plate 101 and the front upholstery body 103 should Headrest 1 move relative to the rear components of headrest 1 and are guided to the head of the occupant.
• the mass sensor 81 in the present case moves rearward relative to the other components of the headrest 1 and in doing so carries out a pivoting movement about the bearing bolts 85 until the mass carrier 83 comes into contact with the stops 91.
• the pivoting bolt link 87 frees the bolt 75 in the z direction upwards, whereby the bolt spring 89 can pull the bolt 75 out of the guide tube 31.
• the swivel compression spring 35 which serves as an energy store for the swivel movement, pushes the now released sliding block 37 to the right, whereupon it also pulls the left toothed rack 45 as the drive-side element of a transmission to the right.
• the right toothed rack 46 which meshes with the left toothed rack 45 and is now rotating, pulls the right toothed rack 46, which meshes with the pinion 63, to the right, ie in the opposite direction to the left toothed rack 45.
• the ratchet wheel 65 which is connected in a rotationally fixed manner to the pinion 63, rotates due to the tooth direction under the locking hook 67.
• the two toothed racks 45 and 46 move the drivers 29 of the swivel devices 25 inwards via their driver adapters 53 and 54, so that the swivel arms 27 serving as output-side elements of the transmission swivel apart in opposite directions from the folded initial state.
• the movement of the swiveling swivel arms 27 on the one hand moves the baffle plate 101 articulated thereon to the front (x direction).
• the locking receptacles 28 leave the locking hooks 23.
• the height compression springs 13 serving as energy stores for the height shift relax thereby and move the swiveling devices 25 together with the base plate 41 and attached components, which together form a second assembly, with respect to the height lock 15, which forms a third assembly together with the headrest rods 5, upward (z-direction).
• the baffle plate 101 thus executes a superimposed movement from two translatory movements in the x and z directions in order to keep the distance from the rear head and far away from the neck in contact with the head of the occupant.
• Swivel stops 25 "formed on the swivel sleeves 25 'of the swivel devices 25 limit the movement of the swivel devices 25 in such a way that the swivel arms 27 point forward in this triggered state.
• the locking hook 67 prevents further rotation of the ratchet wheel 65 and also a movement of the racks 45 and 46.
• This output-side securing of the triggered state prevents the swiveling devices 25 from pivoting back into the initial state against the force of the swiveling compression spring 35, that is to say a reversible absorption of the kinetic energy of the head of the occupant and thus a subsequent retransfer to the head of the occupant is excluded ,
• a headrest 201 for a vehicle seat 202 is attached to two headrest rods 205 inserted into the backrest 203.
• the following directions refer to the arrangement of the vehicle seat 202 in a motor vehicle and its usual direction of travel (x direction).
• the headrest 201 is designed to be displaceable in height (z direction) relative to the backrest 203 in a manner known per se and can be locked by suitable latching means. The initial state or state of use of the headrest 201 is described below.
• each headrest rod 205 there is a stop 207 which is pushed with a sleeve region 207 'onto the headrest rod 205 and is connected to the latter.
• the stop 207 is also connected to an arm region 207 ′′ projecting perpendicularly from the sleeve region 207 ′ and pointing to the other headrest rod 205, forming a cross strut with the stop 207 on the other headrest rod 205.
• a height lock 215 of the headrest 201 comprises an elongated yoke 217 arranged in the transverse direction of the vehicle seat (y direction) with passages 217 ' for the headrest rods 205 and two unlocking keys 219 which are pushed into the corresponding slots of the yoke 217 in the y-direction and which each have a passage 219 'for the associated headrest rod 205.
• the spring-loaded release buttons 219 interact via the edges of their passages 219 'with corresponding notches 205' in the headrest bars 205 in order to lock them.
• the height lock 215 is released from the notches 205 'by pressing the release buttons 219, the entire headrest 201 is moved to the desired height and a new latching position of the height lock 215 is adopted.
• the yoke 217 receives a compression spring 220 with a washer 222 arranged above it in the region of each passage 217 '.
• two radially inwardly curved locking hooks 223 are formed on the yoke 217 in the region of each passage 217 ′.
• each swivel device 225 has a flange-like, first foot region 228 and radially opposite, narrow, second foot region 230, both of which point radially outward and are pivoted under the locking hooks 223 in the initial state of the headrest 201, so that the Swivel device 225 is locked.
• the rear hinges 227 point obliquely inwards.
• a front hinge 232 is articulated to each rear hinge 227 in a manner known per se, that is to say the two hinges 227 and 232 alternately have sleeve-shaped receptacles for a hinge axis 234.
• the hinge axes 234 are arranged parallel to the headrest rods 205. In the same way with further hinge axes 234 there is an essentially plate-shaped impact body on the front hinges 232 which point obliquely outwards 236 articulated.
• a double leg spring 238 has two helically wound areas arranged in the y-direction with a bow-shaped central area extending therebetween and two hook-shaped curved end areas.
• the double leg spring 238 is fastened in its central region to the impact body 236 by means of a holder 242, while it is rotatably hooked with its end regions in two front bearing blocks 244 of the yoke 217 under pretension.
• a rear cushion carrier 246 Opposed to the impact body 236, a rear cushion carrier 246 of a similar dimension is attached to the yoke 217.
• the impact body 236 is held back against the prestressed double leg spring 238 by means of an impact body lock 250.
• the impact body lock 250 has a locking hook 252 which is pivotally mounted in a rear bearing block 254 of the yoke 217.
• the locking hook 252 is hooked from below into the holder 242 of the impact body 236.
• a two-part toggle lever 256 is articulated on the locking hook 252, which is articulated with its other end on the yoke 217.
• the toggle lever 256 is pushed upward in the initial state and thereby holds the locking hook 252.
• a tension spring 258 hanging down is suspended at the kink of the toggle lever 256.
• a shaft 260 which has a plurality of radially projecting arms, is mounted in the yoke 217 below the toggle lever 256.
• the other end of the tension spring 258 is suspended from a middle, forwardly pointing first arm 260 ′.
• a heavy release mass 262 is attached as a mass sensor to a slightly offset, downward-pointing, second arm 260 ".
• a third arm which is arranged offset to the front and is hereinafter referred to as a lock 260"', is arranged above a blocking mass 262 or lies on it.
• the locking mass 262 is also pivotally mounted in the yoke 217 and is biased against the shaft 260 by a leg spring 266.
• the blocking mass 264 prevents triggering, for example in the event of impacts on the headrest 201, by striking them Pulses move faster than the trigger mass 262 and then blocks them by contacting the lock 260 '".
• a cushioned and covered, front cushion body 270 is attached to the front of the impact body 236, while a likewise cushioned and covered, rear cushion body 272 is attached to the back of the rear cushion carrier 246.
• the front cushion body 270 and the rear cushion body 272 lie against one another, enclosing the components described above in the manner of a closed unit, and thus enable the headrest 201 to be used as intended.
• one consisting of the impact body 236 and the front Upholstery body 270 existing first assembly of the headrest 201 move relative to the rear components of the headrest 201 and are guided to the head of the occupant.
• the triggering mass 262 moves rearward relative to the other components of the headrest 201 and thereby performs a pivoting movement with the shaft 260.
• the blocking mass 264 is designed together with its leg spring 266 in such a way that it pivots backwards more slowly and in this case remains ineffective.
• the pivoting shaft 260 pulls over the tension spring 258 on the toggle lever 256.
• the toggle lever 256 breaks down and releases the locking hook 252.
• the impact body lock 250 effective in the x direction is thereby unlocked.
• the double leg spring 238 moves the impact body 236 forward in the x direction.
• the hinge guide consisting of front and rear hinges 232 and 227 opens.
• the foot areas 228 and 230 of the swivel device 225 are released from the locking hooks 223.
• the compression springs 220 can relax, ie the swiveling devices 225, which form a second assembly, are in the z direction upwards in relation to the height locking 215, which forms a third assembly together with the headrest rods 205 top position moved.
• the sleeve freewheels 224 moved transversely to their direction of action do not hinder this movement.
• End stops are provided on the yoke 217 and on the rear cushion support 245 for the pivoting movement of the pivoting devices 225 and the opening movement of the hinge guide.
• the hinges 227 and 232 can also have stops for their movement.
• the impact body 236 thus executes a superimposed movement from two translatory movements in the x and z directions in order to come as close as possible to the back of the head and far from the neck of the occupant's head.
• the two sleeve freewheels 224 clamp the swivel devices 225 to the headrest rods 205.
• the sleeve freewheels 224 are infinitely effective in every intermediate position.
• the headrest 201 To reset the sleeve freewheels 224, the headrest 201 must be brought into its lowest position.
• the headrest rods 205 are there reduced in diameter by recesses 205 ", so that there the sleeve freewheels 224 cannot develop their blocking action.
• a reversible absorption of the kinetic energy of the head of the occupant by means of the double leg spring 238 and thus a subsequent retransfer to the head of the occupant are excluded.

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• Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Seats For Vehicles (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=26008624

Family Applications (1)

Country Status (5)

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• 2002
  • 2002-02-01 WO PCT/EP2002/001034 patent/WO2002068237A1/de not_active Application Discontinuation
  • 2002-02-01 BR BR0204278-9A patent/BR0204278A/pt not_active Application Discontinuation
  • 2002-02-01 EP EP02716708A patent/EP1276634A1/de not_active Withdrawn
  • 2002-02-01 JP JP2002567571A patent/JP2004518575A/ja active Pending
  • 2002-11-06 US US10/288,971 patent/US6623073B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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