Headrest for a motor vehicle seat

Abstract

A headrest (1) for a motor vehicle seat includes: two rods (2) having two upper ends (4) connected to each other by a spacer (5); a first geared motor (8) for driving a first body (6) to slide, the first geared motor driving a first threaded rod (9) to rotate, the first threaded rod being screwed into a first nut (10); a second geared motor (14) for driving a second body (11) to slide, the second geared motor driving a second threaded rod (15) to rotate, the second threaded rod being screwed into a second nut (16); the first geared motor is fixed to the spacer, the first nut is fixed to the first body, the second geared motor is fixed to the second body, and the second nut is fixed to the first body.

Description

Technical Field

[0001] This invention relates to a headrest for a motor vehicle seat. Background Technology

[0002] A headrest for a motor vehicle seat is known, the headrest comprising:

[0003] - A mounting bracket on the seat back, the mounting bracket comprising two vertically extending parallel metal rods, the two upper ends of the two metal rods being connected by a transverse spacer.

[0004] - A first body is vertically slidably mounted on the mounting bracket, allowing the height of the first body to be adjusted. The first body has a longitudinally extending recess.

[0005] A first geared motor is used to drive the first main body to slide. The first geared motor drives the first threaded rod to rotate, and the first threaded rod is screwed into the first nut.

[0006] - A second body is longitudinally slidably mounted on the first body, allowing the second body to be adjusted in the longitudinal direction. The second body is fixedly connected to a support wall supporting the passenger's head. The second body has longitudinally extending protrusions, each protrusion engaging with a corresponding recess.

[0007] - A second geared motor is used to drive the second main body to slide. The second geared motor drives the second threaded rod to rotate, and the second threaded rod is screwed into the second nut.

[0008] The connection between the main bodies via protrusions and recesses ensures reliable sliding installation of the second main body on the first main body. However, this reliable sliding requires large-sized protrusions and recesses to guarantee good rigidity of the assembly.

[0009] As a result, the internal space of the first body will be significantly occupied by the aforementioned recess.

[0010] Therefore, the remaining space in the first body may not be sufficient to allow for the installation of a geared motor, especially in a headrest with a relatively small overall volume.

[0011] The present invention aims to provide an arrangement that allows for the solution of the above-mentioned problems. Summary of the Invention

[0012] Therefore, the present invention proposes a headrest for a motor vehicle seat, the headrest comprising:

[0013] - A mounting bracket on the seat back, the mounting bracket comprising two vertically extending parallel metal rods, the two upper ends of the two metal rods being connected by a transverse spacer.

[0014] - A first body is vertically slidably mounted on the mounting bracket, allowing the height of the first body to be adjusted. The first body has a longitudinally extending recess.

[0015] A first geared motor is used to drive the first main body to slide. The first geared motor drives the first threaded rod to rotate, and the first threaded rod is screwed into the first nut.

[0016] - A second body is longitudinally slidably mounted on the first body, allowing the second body to be adjusted in the longitudinal direction. The second body is fixedly connected to a support wall supporting the passenger's head. The second body has longitudinally extending protrusions, each protrusion engaging with a corresponding recess.

[0017] - A second geared motor is used to drive the second main body to slide. The second geared motor drives the second threaded rod to rotate, and the second threaded rod is screwed into the second nut.

[0018] The headrest also has the following features:

[0019] - The first geared motor is fixed to the spacer, and the first nut is fixed to the first body;

[0020] - The second geared motor is fixed to the second body, and the second nut is fixed to the first body.

[0021] It is hereby explicitly stated that in this specification, spatial positioning terms (up, down, above, longitudinal, lateral, lateral, front, vertical, below, etc.) are all based on the headrest's usage state in the vehicle, which is said to extend longitudinally along its length direction (axis X), laterally along its width direction (axis Y), and vertically along its height direction (axis Z).

[0022] With the proposed arrangement, no geared motor is installed in the first body, which allows for the use of a very compact first body, thus achieving a small-volume headrest. Attached Figure Description

[0023] Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, wherein:

[0024] [ Figure 1 This is a partial perspective view of a headrest according to one embodiment;

[0025] [ Figure 2 To be with Figure 1 A similar view from another perspective. Detailed Implementation

[0026] Referring to the accompanying drawings, a headrest 1 for a motor vehicle seat is described, the headrest comprising:

[0027] - A mounting bracket 2 on the seat back, the mounting bracket comprising two vertically extending parallel (especially tubular) metal rods 3, the two upper ends 4 of the two metal rods being connected, particularly by an insert, by a transverse spacer 5, the transverse spacer being particularly made of injection-molded plastic.

[0028] - A first body 6 is vertically and slidably mounted on the mounting bracket, allowing the height of the first body to be adjusted. The first body is provided with a longitudinally extending recess 7.

[0029] - A first geared motor 8 is used to drive the first main body to slide. The first geared motor drives the first threaded rod 9 to rotate, and the first threaded rod is screwed into the first nut 10.

[0030] - A second body 11 is longitudinally slidably mounted on the first body, allowing the second body to be adjusted in the longitudinal direction. The second body is fixedly connected to a support wall 12 supporting the passenger's head. The second body has longitudinally extending protrusions 13, each protrusion engaging with a corresponding recess 7.

[0031] - The second geared motor 14 is used to drive the second body to slide. The second geared motor drives the second threaded rod (15) to rotate, and the second threaded rod is screwed into the second nut 16.

[0032] The headrest also has the following features:

[0033] The first geared motor is fixed to the spacer, and the first nut is fixed to the first main body.

[0034] - The second geared motor is fixed to the second body, and the second nut is fixed to the first body.

[0035] According to an embodiment not shown, the support wall 12 and the second body 11 are integrally injection molded.

[0036] According to one embodiment, the first body 6 is inscribed within a cuboid-shaped enveloping space, and its vertical, longitudinal, and transverse dimensions are less than 100mm, 45mm, and 185mm, respectively. Such size limitations make it complicated to place the geared motors 8 and 14 with diameters of 30 to 40mm. Therefore, it is more appropriate to arrange the geared motors outside the first body.

[0037] According to a variant, the headrest 1 includes two protrusions 13 arranged around the periphery of the second body 11 and facing each other along two opposite sides of the second body. The two protrusions are in the form of tenons, which, viewed longitudinally, have a shape inscribed in a trapezoid, having a large base 17 facing inward and a small base 18 facing outward. The tenons slide in two recesses 7 in the form of mortises, the shape of which is complementary to the shape of the tenons. The mortises open outward through the small bases to form a dovetail joint.

[0038] According to a variation of an embodiment not shown, the protrusion 13 is in the form of a profile, such as a profile with a triangular or rectangular cross-section, and each profile slides in a corresponding recess 7 in the form of an orifice, the cross-section of which is complementary to the cross-section of the profile.

[0039] It can be observed that this arrangement requires a large number of profiles—at least four—which in turn requires a corresponding number of openings, thereby minimizing the remaining usable space within the first body 6 and making the installation of the geared motors 8 and 14 within the body very complex.

[0040] In one embodiment, a spring-loaded metal sheet 19 that can retract elastically is mounted on the recess 7, the metal sheet abutting against the corresponding protrusion 13 to ensure close contact between the protrusion and the recess.

[0041] In the illustrated embodiment employing tenons and mortises, close contact can be achieved by two metal plates 19 (only one is visible in the figures), which are respectively positioned above and below the first body 6 and are laterally opposite each other. This ensures alignment in both the vertical and horizontal directions while minimizing the number of metal plates.

[0042] According to an embodiment not shown, the second body 11 may be provided with two support wings that laterally support the passenger's head. The support wings are laterally mounted on both sides of the second body and can be adjusted in angle by rotation.

[0043] The lateral support wings can be set to lock in a selected adjustment position by friction or by a locking mechanism.

[0044] According to one embodiment, the first geared motor 8 is mounted on the spacer 5 such that the first threaded rod 9 extends below the first geared motor and the spacer, so that the metal rod does not form a protrusion that could pose a potential danger to the seat occupant.

[0045] According to the embodiment, the second geared motor 14 is fixed to the front of the second body 11, and the second threaded rod 15 extends behind the second geared motor. The second geared motor is covered by the support wall 12, so that the second threaded rod is away from the head of the seat occupant, so that the second threaded rod cannot form a potentially dangerous protrusion.

Claims

1. A headrest (1) for a motor vehicle seat, the headrest comprising: - Mounting bracket (2), mounted on the back of the seat, the mounting bracket comprising two vertically extending parallel metal rods (3), the two upper ends (4) of the two metal rods being connected by a transverse spacer (5). - The first body (6) is vertically slidably mounted on the mounting bracket, so that the height of the first body can be adjusted, and the first body is provided with a longitudinally extending recess (7). - A first geared motor (8) is used to drive the first main body to slide. The first geared motor drives the first threaded rod (9) to rotate, and the first threaded rod is screwed into the first nut (10). - A second body (11) is longitudinally slidably mounted on the first body, allowing the second body to be adjusted in the longitudinal direction. The second body is fixedly connected to a support wall (12) supporting the passenger's head. The second body has longitudinally extending protrusions (13), each protrusion engaging with a corresponding recess (7). - A second geared motor (14) is used to drive the second main body to slide. The second geared motor drives the second threaded rod (15) to rotate, and the second threaded rod is screwed into the second nut (16). The headrest is characterized in that: - The first geared motor is fixed to the spacer, and the first nut is fixed to the first body; - The second geared motor is fixed to the second body, and the second nut is fixed to the first body.

2. The headrest according to claim 1, characterized in that, The headrest includes two protrusions (13) arranged around the periphery of the second body (11) and facing each other along two opposite sides of the second body. The two protrusions are in the form of tenons, which have a trapezoidal shape when viewed longitudinally. The shape has a large base (17) facing inward and a small base (18) facing outward. The tenons slide in two recesses (7) in the form of mortises, the shape of which is complementary to the shape of the tenons. The mortises open outward through the small base to form a dovetail joint.

3. The headrest according to claim 1, characterized in that, The protrusion (13) is in the form of a profile, and each profile slides in a corresponding recess (7) in the form of an orifice, the cross section of which is complementary to the cross section of the profile.

4. The headrest according to any one of the preceding claims, characterized in that, A spring-loaded metal sheet (19) that can retract elastically is mounted on the recess (7) and abuts against the corresponding protrusion (13) to ensure close contact between the protrusion and the recess.

5. The headrest according to claims 2 and 4, characterized in that, The headrest includes two metal pieces (19) respectively disposed above and below the first body (6), and the two metal pieces are opposite each other in the lateral direction.

6. The headrest according to any one of the preceding claims, characterized in that, The second body (11) is provided with two support wings for lateral support of the passenger's head. The two support wings are laterally mounted on both sides of the second body and are rotatable, thereby enabling angle adjustment.

7. The headrest according to any one of the preceding claims, characterized in that, The first geared motor (8) is mounted on the spacer (5) such that the first threaded rod (9) extends below the first geared motor and the spacer.

8. The headrest according to any one of the preceding claims, characterized in that, The second geared motor (14) is fixed to the front of the second body (11), the second threaded rod (15) extends behind the second geared motor, and the second geared motor is covered by the support wall (12).

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