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
  • B60N2/80—Head-rests
  • B60N2/806—Head-rests movable or adjustable
  • B60N2/809—Head-rests movable or adjustable vertically slidable
  • B60N2/812—Head-rests movable or adjustable vertically slidable characterised by their locking devices
  • B60N2/818—Head-rests movable or adjustable vertically slidable characterised by their locking devices with stepwise positioning
• • 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
  • B60N2/809—Head-rests movable or adjustable vertically slidable
• • 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
  • B60N2/897—Head-rests with sleeves located in the back-rest for guiding the rods of the head-rest

Definitions

• the invention relates to a motor vehicle seat headrest and a bearing for such a headrest.
• Two sets of bearings each comprising a high and a low bearing, each of said sets being mounted by fitting said bearings in housings provided in said housing, said bearings being provided with a sliding receiving orifice of the corresponding rod.
• the object of the invention is to propose an arrangement that makes it possible to respond to problems.
• the invention proposes a headrest for a motor vehicle seat, said headrest comprising:
• a casing of molded plastic energy absorbing material in the event of impact of the head of a passenger on said headrest said casing being intended to receive a headrest cushion
• Two sets of bearings each comprising a high and a low bearing, each of said sets being mounted by interlocking said bearings in housings provided in said housing, said bearings being provided with a sliding receiving orifice of the corresponding rod, knowing that, for each of said bearings, the periphery of an orifice is delimited by two fixed zones of said bearing, said zones being opposite longitudinally and being substantially in contact with the corresponding rod, and by two transversely opposed flexible inner tabs, said tabs being of said bearing material and being elastically biased towards said rod so as to grip it.
• the presence of the two transversely opposed flexible inner tabs disposed at the periphery of the orifices makes it possible to absorb in the transverse direction the dimensional variations of the housing due to temperature differences.
• the tabs being resiliently biased towards the rod so as to grip it, it ensures a perfect contact bearing / rod in the transverse direction, just as such contact is guaranteed in the longitudinal direction of the fact that the fixed areas are substantially in contact with said rod.
• the fact of having two internal tabs facing each other makes it possible to guarantee the repeatability of the pressure exerted on the rod, this despite the dimensional variations related to temperature differences. More particularly, the invention proposes that the rods are part of a frame based on a tube or a wire folded in the general shape of U inverted, said rods corresponding to the branches of the U.
• the rods are part of a frame based on a tube or a wire folded in the general shape of inverted U, it is not excluded that said frame can be based on different tubular or wire-based components, said components being assembled together, said armature being for example in the form of a central portion folded at the ends of which are nested substantially straight rods.
• the mechanical strength of the headrest is notoriously improved insofar as the rods form with the housing only two distinct elements, which restricts the degrees of freedom of the assembly; this reduces the sources of noise.
• the rods are perfectly positioned relative to each other by means of the central part of the U-shaped frame, which makes it possible to avoid "crabbing" phenomena which are harmful to the good sliding of said rods .
• the dimensional variations of the housing related to temperature differences are all the more troublesome as to the good sliding of the rods regardless of the temperature of use of the headrest.
• the use of bearings as recommended is particularly relevant.
• the invention relates to a bearing for such a headrest.
• FIG. 1 is an exploded partial perspective view of a headrest according to one embodiment
• FIG. 2 is similar to FIG. 1, the headrest being assembled
• FIG. 3 is a partial vertical vertical vertical sectional view of the headrest of the preceding figures
• FIG. 4 is a partial transverse vertical sectional view of the headrest of the preceding figures
• FIG. 5 is a perspective view of a bearing according to one embodiment
• FIG. 6 is a partial view similar to FIG. 5, a rod being introduced into the bearing
• Figure 7 is a partial front view of a bearing according to a particular embodiment.
• a headrest 1 of a motor vehicle seat comprising:
• a casing 3 made of molded plastic material for absorbing energy in the event of a head being hit by a passenger on said headrest, said casing being intended to receive a headrest cushion,
• Two sets of bearings 4 each comprising a high and a low bearing, each of said sets being mounted by fitting of said bearings in housings provided in said housing, said bearings being provided with an orifice 6 for sliding reception of the rod 2 corresponding, knowing that for each of said bearings, the periphery of an orifice 6 is delimited by two fixed zones 9 of said bearing, said zones being opposed longitudinally and being substantially in contact with the corresponding rod 2, and by two inner lugs 10 opposite flexible transversely, said tabs being derived from material of said bearing and being elastically biased towards said rod so as to grip it.
• the rods 2 are part of an armature 7 based on a tube or a wire folded in the general shape of U inverted, said rods corresponding to the branches of the U.
• the rods 2 have a cylindrical section.
• the rods 2 may have an oval section, the large dimension is particularly oriented longitudinally, this to increase their flexural strength.
• the bearings 4 are made of molded plastic material
• the bearings 4 are identical.
• the housing 3 is molded in one piece, which makes it possible to avoid the formation of dangerous edges which may appear, following an impact, on a housing in two parts welded to one another.
• the inner lugs 10 of a bearing 4 comprise a connecting end 1 1 to the remainder of said bearing and a free end 12, so as to define in said bearing slots 1 3 extending along said lugs, said slots opening inwards through an opening 14 defined by a free end 12 and the zone 15 of said bearing disposed closer to said free end.
• the inner lugs 10 of a bearing 4 are biased resiliently by means of two respective spring blades 16 mounted on said bearing. According to the embodiment shown, the spring blades 16 are inserted into the slots 13.
• each of the spring blades 16 has:
• said tab being further provided with a second boss 34 disposed between its free end 12 and said first boss, said second boss being disposed near said blade so as to bear on it when said blade is actuated in outward movement , so as to contain the movement of said end portion and to optimize the synchronized sliding of the rods 2, preventing a "crabbing" that may block said sliding.
• the second boss 34 is disposed less than 0.20 mm from the spring blade 16, being in particular distant of the order of 0.15 mm from said blade.
• the inner lugs 10 and / or the fixed zones 9 are shaped so as to match the geometry of a rod 2.
• the fixed zones 9 are arranged at the interface of two inclined faces 17 forming an acute external angle 18.
• the headrest 1 comprises a locking device of the housing 3 relative to the rods 2 in a plurality of vertical positions, so as to allow a height adjustment of said housing relative to said rods, said device comprising: A notched rod 2 provided with axially axially locking notches 19, that is to say along the direction of extension of said rod,
• a locking projection mounted movably relative to said housing between a locking position, where said projection fits into one of said notches, and an unlocking position, wherein said projection withdraws from said notch in order to release the sliding of said toothed rod.
• the two rods 2 are provided with locking notches 19, the locking device comprising a cross-member 21 mounted transversely sliding in the housing 3, said cross-bar comprising two locking projections, said cross-member being provided on one of its ends of a push button 22 for actuating it from a locking position, wherein said projections each insert into a notch 19 corresponding rod 2, to an unlocking position, wherein said projections withdraw from said notches, said support headpiece is further provided with a return spring of said cross member to its locking position.
• the locking device comprising a cross-member 21 mounted transversely sliding in the housing 3, said cross-bar comprising two locking projections, said cross-member being provided on one of its ends of a push button 22 for actuating it from a locking position, wherein said projections each insert into a notch 19 corresponding rod 2, to an unlocking position, wherein said projections withdraw from said notches, said support headpiece is further provided with a return spring of said cross member to its locking position.
• the notches 19 are in the form of notches opening towards the front - according to the embodiment shown - or towards the rear, said notches being obtained by deformation of the constituent metal of the rod 2, in particular according to the technique of " rolling ", the openings 14 of the slots 13 being disposed opposite the side edges 24 of said notches, so as not to hinder the sliding of a notched rod 2 provided with a deformation projecting at said edges.
• the bearings 4 are provided with external elastically deformable tabs 25, said tabs being in abutment against the inner wall 20 of the housings 5 so as to maintain said bearings locked in said housings, in order to ensure firm retention of the housing 3 relative to the frame 7 while allowing a movement of said bearings, by deformation of said tabs in said housing in the longitudinal and transverse directions.
• Such an arrangement makes it possible to optimally absorb the dimensional variations of the casing 3 related to temperature variations, in particular in the transverse direction, while avoiding a blockage of the sliding of the rods 2. Moreover, it makes it possible to ensure a perfect cohesion between the frame 7 and the housing 3.
• a bearing 4 is described for such a headrest 1, said bearing being provided with an orifice 6 for slidingly receiving an armature rod 2 of said headrest, the periphery of an orifice 6 being delimited by two fixed zones 9 of said bearing, said zones being longitudinally opposed and being intended to be substantially in contact with a corresponding rod 2, and by two transversely opposed flexible inner tabs 10, said tabs being derived from material of said bearing and being elastically biased towards the interior of said orifice so as to grip said rod once introduced into said orifice.

Landscapes

• Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Seats For Vehicles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=57539344

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (3)

Family Cites Families (3)

• 2016
  • 2016-07-22 FR FR1657027A patent/FR3054176B1/fr not_active Expired - Fee Related
• 2017
  • 2017-07-21 WO PCT/FR2017/052019 patent/WO2018015691A1/fr not_active Ceased
  • 2017-07-21 EP EP17754743.7A patent/EP3487726A1/de not_active Withdrawn

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