Motor vehicle seat headrest

Abstract

The invention relates to a headrest (1) for a motor vehicle seat, said headrest comprising a structure (2) made of molded plastic material and a mounting frame (3) having two rods (4) connected to a crosspiece (5), said structure having two conduits (6) each receiving an upper part of the rod (4), each of the upper parts being provided with a notch (7) flush with the bottom of the corresponding conduit (6), said headrest further comprising two pins (8) for locking said rods in sliding, each of said pins: having a substantially rectilinear middle part and two branches coming from the ends of said middle part, said branches being connected to said middle part by a fold; being mounted around one of said rods so that said middle part is inserted into the notch (7) of said rod and said branches surround said rod and abut against the bottom of the corresponding conduit (6). Figure 2

Description

Title of the invention: Headrest for a motor vehicle seat

[0001] The invention relates to a headrest for a motor vehicle seat.

[0002] It is known to produce a headrest for a motor vehicle seat, said headrest comprising: a structure made of molded plastic material lined with a headrest cushion, a frame for mounting said headrest at the top of the back of said seat, said frame being based on a metal tube folded to present in longitudinal view a general shape of an inverted U, so that said frame has two parallel cylindrical rods connected at their upper ends by a transverse crosspiece, said structure being fixed to said frame,

[0003] said structure having two conduits each receiving an upper rod part, each of the upper parts being provided with a notch flush with the bottom of the corresponding conduit, so as to eliminate the risk of vibration, and therefore of noise pollution, when said vehicle is moving.

[0004] According to a known embodiment, each rod is locked in sliding on the structure by a respective pin, in the form of a rectilinear rod, said pin being inserted by force on the one hand into an orifice provided in the structure, at the bottom of the corresponding conduit, and on the other hand into the notch of the corresponding rod.

[0005] However, such a method of fixing the rods may prove to be undurable, a pin being liable to come out of the notch, which risks causing the structure to slide relative to the frame, which may prove dangerous for an occupant of the seat in the event of their head hitting the headrest cushion.

[0006] The invention aims to overcome this drawback.

[0007] To this end, the invention proposes a headrest for a motor vehicle seat, said headrest comprising: a structure made of molded plastic material lined with a headrest cushion, a frame for mounting said headrest at the top of the back of said seat, said frame being based on a metal tube folded to present in longitudinal view a general shape of an inverted U, so that said frame has two parallel cylindrical rods connected at their upper ends by a transverse crosspiece, said structure being fixed to said frame,

[0008] said structure having two conduits each receiving an upper rod part, each of the upper parts being provided with a notch flush with the bottom of the corresponding conduit, said headrest further comprising two wire pins elastic metal for locking said rods in sliding, each of said pins: • having a substantially rectilinear middle part and two branches coming from the ends of said middle part, said branches being connected to said middle part by a fold, • being mounted around one of said rods so that said middle part fits into the notch of said rod and said branches surround said rod and come into abutment against the bottom of the corresponding conduit.

[0009] In this description, the terms of positioning in space (top, bottom, longitudinal, transverse, upper, below, etc.) are taken with reference to the vehicle in which the headrest is arranged in use, said vehicle extending longitudinally along its length (X axis), transversely along its width (Y axis) and vertically along its height (Z axis).

[0010] With the proposed arrangement, due to the configuration of the pins allowing their insertion into the notches to be secured, a very robust sliding locking of the rods on the structure is ensured, which optimizes the safety of an occupant of the seat.

[0011] Other features and advantages of the invention will appear in the following description, given with reference to the attached figures, in which:

[0012] [Fig-1] is a schematic representation in partial perspective of a headrest according to one embodiment,

[0013] [Fig.2] is an exploded view similar to that of [Fig.l], from another angle of view,

[0014] [Fig.3] is a partial schematic sectional view of the headrest shown in Figures 1 and 2.

[0015] With reference to the figures, a headrest 1 for a motor vehicle seat is described, said headrest comprising: • a structure 2 made of molded plastic material filled with a headrest cushion, not shown, • a frame 3 for mounting said headrest at the top of the back of said seat, said frame being based on a metal tube folded to present in longitudinal view a general shape of an inverted U, so that said frame has two parallel cylindrical rods 4 connected at their upper ends by a transverse crosspiece 5, said structure being fixed to said frame,

[0016] said structure having two conduits 6 each receiving an upper part of rod 4, each of the upper parts being provided with a notch 7 flush with the bottom of the corresponding conduit 6, said headrest further comprising two pins 8 made of elastic metal wire for locking said rods in sliding, each of said pins: • having a substantially rectilinear middle part 9 and two branches 10 coming from the ends of said middle part, said branches being connected to said middle part by a fold 11, • being mounted around one of said rods so that said middle part fits into the notch 7 of said rod and said branches surround said rod and come into abutment against the bottom of the corresponding conduit 6.

[0017] According to the embodiment shown, the branches 10 bear in tight contact against inclined sections 12 provided on the structure, said sections forming cam surfaces and being shaped so as to force the middle part 9 into position at the bottom of the notch 7 by elastically bringing said branches together.

[0018] Such an arrangement makes it possible to eliminate sound vibrations which could result from dimensional dispersions which could affect the different components of the headrest 1.

[0019] According to a variant not shown, the branches 10 bear in tight contact against the rods 4, said branches being shaped so that a rod 4 defines two cam surfaces respectively receiving each of said branches, so as to force the positioning of the middle part 9 at the bottom of the notch 7 by elastically bringing said branches together.

[0020] As seen previously, such an arrangement also makes it possible to eliminate sound vibrations which could result from dimensional dispersions which could affect the different components of the headrest 1.

[0021] According to the embodiment shown, the branches 10 are generally rectilinear and extend substantially perpendicularly to the middle part 9, said branches having free end parts in the form of folds 13 pointing towards each other, said branches bearing against the inclined sides 12 by said end parts.

[0022] According to the embodiment shown, the free ends 14 of the end parts of the branches 10 are folded so as to move away from each other, so as to facilitate the mounting of the pins 8, by a “funnel effect”.

[0023] According to the embodiment shown, the crosspiece 5 is fitted into the structure 2, in particular into a gutter 15 provided on said structure.

[0024] According to the embodiment shown, as illustrated in [Fig.3], at least one of the conduits 6 has an oblong section whose large dimension extends transversely, the small dimension of said section corresponding to the diameter of the corresponding rod 4, such an arrangement making it possible to absorb transverse dimensional dispersions while ensuring firm support of the rods in a longitudinal direction.

Claims

Claims

1. Headrest (1) for a motor vehicle seat, said headrest comprising: • a structure (2) made of molded plastic material lined with a headrest cushion, • a frame (3) for mounting said headrest at the top of the back of said seat, said frame being based on a metal tube folded to present in longitudinal view a general shape of an inverted U, so that said frame has two parallel cylindrical rods (4) connected at their upper ends by a transverse crosspiece (5), said structure being fixed to said frame, said structure having two conduits (6) each receiving an upper part of the rod (4), each of the upper parts being provided with a notch (7) flush with the bottom of the corresponding conduit (6), said headrest being characterized in that it further comprises two pins (8) made of elastic metal wire for locking said rods in sliding,each of said pins: • having a substantially rectilinear middle part (9) and two branches (10) coming from the ends of said middle part, said branches being connected to said middle part by a fold (11), • being mounted around one of said rods so that said middle part fits into the notch (7) of said rod and said branches surround said rod and come into abutment against the bottom of the corresponding conduit (6).,

2. Headrest (1) according to claim 1, characterized in that the branches (10) bear in tight contact against inclined sections (12) provided on the structure (2), said sections forming cam surfaces and being shaped so as to force the middle part (9) into position at the bottom of the notch (7) by elastically bringing said branches together.

3. Headrest (1) according to the preceding claim, characterized in that the branches (10) are generally rectilinear and extend sen-

4.

5.

6. possibly perpendicular to the middle part (9), said branches having free end parts in the form of folds (13) pointing towards each other, said branches bearing against the inclined sides (12) by said end parts. Headrest (1) according to the preceding claim, characterized in that the free ends (14) of the end parts of the branches (10) are folded so as to move away from each other, so as to facilitate the mounting of the pins (8). Headrest (1) according to any one of the preceding claims, characterized in that the crosspiece (5) is fitted into the structure (2). Headrest (1) according to any one of the preceding claims, characterized in that at least one of the conduits (6) has an oblong section whose large dimension extends transversely, the small dimension of said section corresponding to the diameter of the corresponding rod (4).

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