A headrest for motor vehicle seats

Abstract: A headrest (1) for motor vehicle seats (S) wherein two support rods (22) projecting from a resilient body (2) are slidably mounted through a pair of tubular guide elements (3) rigidly secured to the structure (T) of the backrest (B) of the seat (S) so as to allow height adjustment of the headrest (1). The lower ends (2a) of the support rods (22) are rigidly connected to each other by a transverse member (4) to which a remote control operating device (11; 19) is operatively connected to perform raising and lowering thereof.

Description: The present invention relates to a headrest for motor vehicle seats according to the preamble of claim 1, comprising a resilient body, a pair of parallel support rods projecting from said resilient body and including corresponding lower ends, a seat backrest having a structure, and a pair of tubular guide elements rigidly secured to said structure and through which said support rods are slidably mounted so as to allow height adjustment of said resilient body, as disclosed in document DE 4216548 A. In the following description and claims the terms "lower", "upper", "raising", "lowering" and the like are to be intended referred to the mounted condition of the headrest on top of the backrest of a motor vehicle seat. In the headrests of the above-referenced type, height adjustment of the resilient body is generally performed manually raising and lowering this body, which is normally difficult, uncomfortable and unpractical. Motor-driven adjustment systems have also been provided, which are however relatively complicated and expensive and additionally require considerable constructive complications for installation thereof within the seat backrest. From the document DE 42 16 548 A, it is known a headrest provided with a pair of support rods projecting downwardly from the resilient headrest and connected to a transverse member, which is operatively connected with remote control operating means. The support rods are slidable on a pair of bushes secured to a upper transverse member of the backrest structure. The operating means include a rotatable screw rotatably mounted on the backrest upper transverse member and engaging a screw nut secured to the transverse member connected to the support rods. The object of the present invention is to overcome the drawback of the above known headrest, and more particularly to provide a headrest for motor vehicle seats of the type set forth in the above, provided with an extremely simple and cheap operating device, both from the point of view of manufacturing and in connection to mounting thereof within a seat backrest for height adjustment of the headrest. According to the invention, this object is achieved by a headrest for motor vehicle seats, comprising a resilient body, a pair of parallel support rods projecting from said resilient body and including corresponding lower ends, a seat backrest having a structure, a pair of tubular guide elements rigidly secured to said structure and through which said support rods are slidably mounted so as to allow height adjustment of said resilient body, a transverse member rigidly connecting said lower ends, and remote control operating means operatively connected to said transverse member to perform raising and lowering thereof, characterized in that a box-like protecting body houses said support rods and said transverse member and is formed of a front half-shell and a rear half-shell both secured to each one and to said tubular elements, said box-like protecting body also including a bottom wall supporting said operating means. The operating means may comprise a flexible cable transmission, with a sheath having one end anchored to the bottom wall of the box-like protecting body, or a motor-driven actuator carried by the bottom wall of the box-like protecting body, and conveniently swingable around an axis parallel to the transverse member. The invention will now be disclosed in detail with reference to the accompanying drawings, purely provided by way of non-limiting example, in which: figure 1 is a side elevational diagrammatic view showing a motor vehicle seat provided with a headrest according to the invention, figure 2 is a rear elevational view according to arrow II of figure 1 in an enlarged scale, showing a portion of the headrest of the invention according to a first embodiment; in the same figure, a second embodiment is partially shown in dotted lines, figure 3 is a horizontally sectioned and enlarged view along line III-III of figure 2, figure 4 is a vertically sectioned and enlarged view along line IV-IV of figure 2, expressly related to the second embodiment, and figure 5 is a horizontally sectioned view along line V-V of figure 2. Referring initially to figure 1, reference S diagrammatically indicates a motor vehicle seat comprising a cushion P and a backrest B, on top of which a headrest 1 according to the invention is located. The headrest essentially comprises a resilient body or pillow 2, normally made of foamed plastic material and incorporating a supporting framework not shown in the drawings, since generally conventional, in turn rigidly or tiltably connected to a pair of parallel support rods 22, shown in figures 2 and 3, projecting downwardly from the base of the resilient body 1. The support rods 22 extend within the backrest B of the seat S and are connected to the supporting structure thereof, namely to an upper transverse member T, by means of a pair of moulded plastic material bushes, generally designated as 3. In the shown example, the two bushes 3 are directly overmoulded, upon forming thereof, on the transverse member 4. In alternative, these bushes 3 may be formed in one piece with a connecting plate, which in turn is mechanically secured to the supporting structure of the backrest B. The two support rods 22 are frictionally slidable through the bushes 3, to the aim of allowing height adjustment of the resilient body 2 relative to the backrest B. These support rods 22 are normally arcuate or curved, with their concavity facing forwardly (i.e. to the left with reference to figure 1) so as to perform during raising of the resilient body 2 a forward displacement thereof, compensating the backward slant of the backrest B. According to a first aspect of the invention, the lower ends of the two support rods 22, designated as 2a, are rigidly connected to each other by a transverse member 4, which is conveniently made of moulded plastic material, having hollow ends 4a anchored to the lower ends 2a of the support rods 22, conveniently by means of snap-fit engagements. To such effect, the hollow ends 4a of the transverse member 4 are formed with respective resilient wings 4b snap-fitted into corresponding notches (not depicted in the drawings) of the lower ends 2a of the support rods 22. Reference numeral 5 designates a box-like protection body, also made of moulded plastic material, which is rigidly secured to the two bushes 3 and within which the support rods 22 with the transverse member 4 are housed. The box-like body 5 is formed by a front half-shell 6 and by a rear half-shell 7 connected to each other and to lower plate appendages 8 of the two bushes 3, by means of snap-fit engaging members 9. According to the invention, the bottom wall 10 of the box-like body 5 acts as a support for a remote control operating device operatively connected to the transverse member 4 so as to perform raising and lowering of the support rods 22 and, consequently, of the resilient body 2 of the headrest 1 relative to the backrest B. The invention provides two alternative embodiments of the control operating device. The first embodiment, shown in figure 1 and with full line in figure 2, comprises a flexible bowden-cable transmission 11, with a sheath 12 extending between a manual control unit 13 (for instance positioned at one side of the cushion P of the seat S) and an attachment member 14 anchored in correspondence of a central aperture 15 of the bottom wall 10 of the box-like body 5. A flexible metal cable 16 is slidable within the sheath 12, whose end projecting outwardly of the attachment member 14 is formed with a hook member 17 in turn connected to a quick-connection central portion 18, shown in detail in figure 5, of the transverse member 4. In the variant shown in figure 2 with dotted lines and in figure 4, the remote control operating device is comprised of an electrical motor 19, connected to an electrical control circuit (not shown in the drawings since generally conventional), and also directly connected to the bottom wall 10 of the box-like protection body 5. Since, as explained in the above, the two support rods 5 are normally arcuate, and therefore the respective lower ends 2a together with the transverse member 4 will move along a curvilinear path during raising and lowering thereof, the electrical motor 19 is connected to the box-like body 5 in a swingable way around an axis 21 parallel to the transverse member 4. To such effect, the bottom wall 10 of the box-like body 5 is integrally formed with an outwardly projecting bracket 20 to which the body of the motor 19 is pivoted around said transverse axis 21. As shown in figure 4, the shaft 24 of the electrical motor 19 passes through the aperture 15 of the bottom wall 10 and is connected, for instance by means of a transverse pin 23, to the central area of the transverse member 4. The pivoted connection of the motor 19 to the box-like body 5 is not necessary in case the support rods 22 are rectilinear instead of curved. Naturally, the details of construction and the embodiments may be widely varied with respect to what has been disclosed and illustrated, without thereby departing from the scope of the present invention, such as defined in the appended claims.

Claims: A headrest (1) for motor vehicle seats (S), comprising a resilient body (2), a pair of parallel support rods (22) projecting from said resilient body (2) and including corresponding lower ends (2a), a seat backrest (B) having a structure (T), a pair of tubular guide elements (3) rigidly secured to said structure (T) and through which said support rods (22) are slidably mounted so as to allow height adjustment of said resilient body (2), a transverse member (4) rigidly connecting said lower ends (2a), and remote control operating means (11; 19) operatively connected to said transverse member (4) to perform raising and lowering thereof, characterized in that a box-like protecting body (5) houses said support rods (2) and said transverse member (4) and is formed of a front half-shell (6) and a rear half-shell (7) both secured to each one and to said tubular elements (3), said box-like protecting body (5) also including a bottom wall (10) supporting said operating means (11; 19). A headrest according to claim 1, characterized in that said lower ends (2a) are provided with corresponding notches, said transverse member (4) being made of moulded plastic material and being provided with two hollow ends (4a) for receiving said lower ends (2a), said hollow ends (4a) having resilient wings (4b), adapted to be snap-fitted into the corresponding notches of said lower ends (2a). A headrest according to claim 1 or 2, characterized in that said tubular guide elements are formed of moulded plastic material bushes (3) each one with a corresponding lower plate appendage (8), said half-shells (6, 7) being formed of moulded plastic material and being secured to each other and to said lower plate appendages (8) through snap-fit engaging members (9). A headrest according to any previous claim, characterized in that said operating means (11, 19) is formed of a flexible cable transmission (11) comprising a sheath (12) having one attachment member (14) anchored to a central aperture (15) of said bottom wall (10), and a flexible cable (16) slidable within said sheath (12), said flexible cable (16) having an end projecting outwardly said attachment member (14) and connected to said transverse member (4), A headrest according to claim 4, characterized in that said transverse member (4) is provided with a quick connection central portion (18), the projecting end of said flexible cable (16) being provided with a hook member (17) adapted to be quickly connected to said central portion (18). A headrest according to any claim from 1 to 3, characterized in that said operating means (11, 19) is formed of an powered actuator (19), which is swingably connected to said bottom wall (10) around a transverse axis (21) parallel to said transverse member (4). A headrest according to claim 6, characterized in that said support rods (22) are arcuate so that said lower ends (2a) and said transverse member (4) are movable along a curvilinear path, said bottom wall (10) being provided with an outwardly projecting bracket (20) carrying said axis (21), said powered actuator including an electric motor (19) having a shaft (24) passing through an aperture (15) of said bottom wall (10), said shaft 24 being connected to a central portion of said transverse member (4) by means including a transverse pin (23).

Inventors: DE FILIPPO EMILIO, DE FILIPPO, EMILIO
Applicants: BRUZOLO MANIFATT GESTIND MB, GESTIND-M.B." MANIFATTURA DI BRUZOLO" S.P.A
Application year: 1996
Main classification: B60N2
IPC codes: B60N2