NECK REST

Abstract: The invention relates to an adjustable headrest comprising a first part (4) which is pivotally arranged in relation to a second part (1, 2) and adapted to be adjusted in at least two predetermined angular positions in relation to the second part (1, 2). The invention is characterized in that it comprises an adjustable control device (8; 18; 20) for lockable adjustment of the first part (4) in relation to the second part (1, 2). The invention provides an improved, adjustable headrest for a vehicle, which headrest comprises an adjustment mechanism which has a simple design, which can be adjusted with one hand only by the occupant and which remains securely locked in an assumed position even during sudden acceleration and deceleration.

Description: TITLE: NECK REST TECHNICAL FIELD: The present invention relates to an adjustable headrest according to the preamble of appended claim 1. In particular, the invention can be applied in the field of manually adjustable headrests for vehicles. BACKGROUND OF THE INVENTION: In the field of vehicles, for example cars, the different seats for the driver and the passengers, respectively, are normally provided with headrests. A general requirement is that the headrest should be arranged adjacent to the occupant's head so as to provide support for the neck during driving, since the occupant is normally leaning back. Furthermore, a purpose with such a headrest is to provide protection in the event of a collision. Fixed (i.e. non-adjustable) headrests are common in today's vehicles. Although a headrest of this type normally provides good support and protection for the head of the occupant, its effect is somewhat limited since it does not provide equally high comfort and protection for all occupants. This is of course due to the fact that different occupants have different body shapes and driving positions. This problem can be solved by means of a headrest which comprises an adjustment mechanism, so that the headrest can be inclined and positioned in different angular positions in relation to the occupant's seat, i.e. in relation to the seat's backrest. A number of different types of such adjustable headrests are previously known. One solution is based on the principle that only frictional force is used to lock the headrest in the desired position in relation to the backrest of the vehicle seat. Furthermore, mechanisms are also known by means of which the headrest can be swung back and forth between a plurality of positions, step by step towards an end position, and wherein further tilting results in the headrest resuming its initial position so that adjustment can be carried out again. Furthermore, solutions comprising electrical adjustment of the headrest and which also may comprise a memory are previously known. Although the previously known adjustable headrests function in an acceptable manner in most situations, they imply certain problems. Firstly, they do allow adjustment of the headrest by using one hand only, which is required from a comfort point of view of the occupant and which also is an advantage as regards safety, since the driver cannot remove both hands from the steering wheel while driving the vehicle. Another problem associated with the previously known solutions relates to the fact that they cannot normally hold the headrest in the assumed position in case of a collision or during sudden acceleration or deceleration. Naturally, this may lead to personal injuries. Furthermore, the known solution which comprises an electrical adjustment mechanism involves a disadvantage, i.e. it is too expensive to manufacture and unnecessarily complicated. SUMMARY OF THE INVENTION: A main object of the present invention is thus to solve the above-mentioned problems and to provide an improved adjustable headrest for a vehicle, which headrest comprises an adjustment mechanism which is of a simple design, which can be adjusted by means of one hand only by the occupant, and which remains firmly fixed in its assumed position even during sudden acceleration and deceleration. This is accomplished by means of a device as initially mentioned, the characterizing features of which will be apparent from claim 1. By using a particular locking bracket having a number of recesses and a control device comprising a protruding section which cooperates with one of the recesses, an effective adjustment of the headrest is allowed. In this regard, the locking bracket is fixed to a bent bar or the like which is adapted for mounting in a backrest, whereas the control device is pivotally arranged in the headrest itself. Preferably, the control device is designed as a bent bar which is arranged on the rear side of the headrest, directly under its surface and in a position where the occupant can reach it easily and actuate it with one hand. In this regard, it is important that the adjustment mechanism allows actuation by means of a one-handed grip, so as not to jeopardise the safety in a situation where it is necessary to readjust the headrest when the vehicle is in motion. By means of the invention, a simple and effective adjustment of the headrest is provided, due to the fact that the vehicle occupant is able to actuate the control device with one hand and since the headrest can be gripped simultaneously with the hand for setting it in the desired position. BRIEF DESCRIPTION OF THE DRAWINGS: The invention will be described in greater detail in the following with reference to the annexed drawings, in which Fig. 1 is a perspective rear view, seen from an angle, of an adjustable headrest according to the present invention, which however does not show the padding of the headrest, Fig. 2 is a side view of the headrest according to Fig. 1, and Fig. 3 is a simplified side view of a headrest according to an alternative embodiment of the invention. PREFERRED EMBODIMENTS: Fig. 1 shows a perspective view of an adjustable headrest according to the present invention. For reasons of clarity, Fig. 1 does not show any padding or the like in the headrest. Consequently, only the support structure of the headrest is illustrated. According to a preferred embodiment, the headrest comprises a first bent bar 1 having posts 2 which are intended to be mounted in a conventional manner in a backrest 3 forming part of a vehicle seat. Furthermore, the headrest also comprises a component in the form of a second bent bar 4 which is pivotally arranged on the two posts 2. To this end, the second bar 4 is fixed in the respective post 2 by means of a rotary attachment (not shown in detail) so as to define an axis of rotation 5. In this manner, the second bar 4 constitutes a part which can be set at different angular positions in relation to another part, i.e. the first bar 1. In a conventional manner, the second bar 4 carries padding and covering (not shown in Fig. 1), thereby forming a headrest. The second bar 4 is preferably designed with two plate-shaped elements 6, 7. Consequently, these elements 6, 7 form extensions of the second bar 4, i.e. they form the frame for the sides of the headrest. Furthermore, the invention comprises a control device 8 which is pivotally arranged on one of the plate-shaped elements 6. According to the detailed description below, the control device 8 cooperates with a locking bracket 9 which is fixed to the first bar 1, preferably on the side of one of the two posts 2. Fig. 2 shows a side view of the headrest according to the invention. This drawing also shows the headrest 10 itself, i.e. the cushion-like padding which forms a support for the occupant's head. The drawing illustrates that the locking bracket 9 is fixed to a post 2. Preferably, the locking bracket 9 is designed as a plate or the like, the upper side of which is slightly curved and designed with a plurality of holes or recesses 11 extending essentially vertically. Furthermore, the control device 8, which is pivotally arranged on the plate-shaped element 6 about an axis of rotation 12, comprises a radially protruding part 13 having a protruding section 14 in the form of a peg or the like. The control device 8 can be rotated about its axis of rotation 12 so that the protruding section 14 engages in one of the recesses 11 of the locking bracket 9. In this manner, the recesses 10 of the locking bracket 9 correspond to different angular positions for setting the headrest 10 in a certain position in relation to the backrest 3. During use, the headrest 10 can be set at a desired angular position in relation to the backrest 3 when the occupant manually operates the control device 8. To this end, the control device 8 is designed as an L-shaped bar as is shown in detail in Fig. 1, i.e. with a first section extending along the extension of the headrest 10 and a second section extending across the extension of the headrest 10. In this regard, the first section of the control device 8 constitutes a lever for rotating the control device 8 about its axis of rotation 12, so that the protruding section 14 can be lifted out of engagement with a recess 11. When the control device 8 is operated in the forwards direction (i.e. counter-clockwise about the axis of rotation 12, as shown in Fig. 2), the section 13 of the control device 8 will thus be turned in the counter¬ clockwise direction. This causes the protruding section 14 to be lifted out of the recess 11 in which it presently engages. As a result, the headrest 10 can be rotated about its axis of rotation 5 for moving it to a desired angular position. When the control device 8 is later released, the protruding section 14 is once again allowed to engage in one of the recesses 11 in the locking bracket 9, thereby locking the control device 8 in both the forward and rearward direction. For the purpose of effectively locking the protruding section 14 of the control device 8 in one of the recesses 11, the invention preferably comprises a spring element 15 which is arranged in connection with the axis of rotation 12 of the control device 8 and which urges the control device 8 to rotate about its axis of rotation 12 in a direction towards the locking bracket 9, i.e. clockwise in Fig. 2. Preferably, the spring element 15 is constituted by a helical spring having one or several of its windings wound around the axis of rotation 12. One of the ends of the spring element 15 is fixed in the plate 6 and the other end contacts and acts upon the control device 8 so that it is urged to rotate and engage in a recess 11 in the locking bracket 9. The invention provides a very simple operation due to the fact that the control device 8 can be operated and the headrest 10 can be set in the desired position by means of a one-handed grip. It will be noted that the operation may be carried out by pressing the upper part or alternatively the side of the headrest 10 so as to actuate the control device 8. The control device 8 is preferably manufactured from a material which is very light, for example magnesium or the like. In this manner, the mass forces arising as a result of a collision will be as low as possible. According to a possible embodiment, the control device 8 can be connected with a particular counterweight 16 which is arranged below the point 12 of rotation of the control device 8. As is apparent from Fig. 2, the counterweight 16 counteracts the forces which arise should a collision occur and which urges the control device 8 forwards (i.e. counter-clockwise in Fig. 2). Fig. 3 shows an alternative control device for adjustment of the headrest 10. According to this embodiment, the control device comprises an electrical switch 18 which in turn comprises a push button 19. As is evident from the drawing, the push button 19 is arranged in the position on the rear side of the headrest 10 where the fingers 17 of the occupant are expected to be placed when the occupant stretches back to actuate the control device. The switch 18 is electrically connected to a solenoid 20 which is fixed to the bar 1, preferably on one of its posts 2. In a known manner, the solenoid 20 comprises a displaceable piston 21. Furthermore, the axis 5 of rotation of the headrest 10, alternatively one of the plates 6 or 7 (cf. Fig. 1), is connected to a locking bracket 22 which is designed with a plurality of grooves or recesses 23 intended to cooperate with the piston 21. The solenoid 20 can be activated by means of voltage supply 24 which is arranged in, or in connection with, the headrest 10. In its non-activated condition, the piston 21 is actuated so as to assume a protruding position by means of a spring 25. Consequently, in this condition the piston 21 engages in one of the recesses 23, resulting in the headrest 10 being prevented from being adjusted. If the occupant actuates the switch 18 by stretching back the hand and pushing the push button 19, the solenoid 20 will be activated. This results in the piston 21 being drawn into the solenoid 20, overcoming the force from the spring 24. This in turn results in the piston 21 no longer engaging in the recess, which allows the position of the headrest 10 to be adjusted. When the headrest 10 is rotated about the axis 5, the locking bracket 22 will also be rotated to an equal degree. This results in a corresponding recess 23 being positioned directly in front of the piston 21. When the push button 19 is subsequently released, the piston 21 will be ejected once again, so that the headrest 10 will once more be locked. In a conventional manner, the headrest 10 comprises a covering which can be constituted by a thin layer of fabric or plastic material on top of padding in the form of synthetic foam or the like. The control device 8 (alternatively 18) is preferably arranged directly underneath this covering, thereby allowing the occupant to press with one or two fingers 17 on the covering, at the position where the control device is situated, so as to activate the adjustment of the headrest. The invention is not limited to the above-mentioned embodiments, but may be varied within the scope of the subsequent claims. For example, the control device 8 may be constituted by a bar which is designed as an inverted U and which is mounted on both sides of the headrest with two attachment positions on the second bar 4. Furthermore, the headrest 10 can be provided with an opening or a recess on the rear side, so as to indicate the position at which the control device can be reached. Also, to this end the covering can be provided with a sewn-on patch of textile or an elevated section of the covering, both indicating where the occupant is supposed to press so as to reach the control device. Furthermore, the different angular positions in which the headrest 10 can be set are normally three or four in number. This means that the locking bracket 9 (alternatively 22) in a corresponding manner is provided with three or four different recesses. Another number of recesses is of course also possible within the scope of the invention. As an alternative to these recesses, the locking bracket can be provided with spikes, cogs, pressed protrusions or similar shape modifications which are intended to cooperate with the control device 8 (alternatively with the piston 21). Finally, the invention can be used both in vehicle seats in which the headrest forms a part of the backrest (so-called "articulated back") and in the cases in which the headrest constitutes a separate unit which is mounted on a backrest.

Claims: CLAIMS : 1. Adjustable headrest comprising a first part (4) which is pivotally arranged in relation to a second part (1, 2) and adapted to be adjusted in at least two predetermined angular positions in relation to the second part (1, 2), c h a r a c t e r i z e d i n that it comprises an adjustable control device (8; 18; 20) for lockable adjustment of the first part (4) in relation to the second part (1, 2) . 2. Adjustable headrest according to claim 1, c h a r a c t e r i z e d i n that the control device (8) is pivotally arranged in said first part (4) and adapted to cooperate with a locking bracket (9) which is fixed in said second part (1, 2), whereby a predetermined angular position of the first part (4) in relation to the second parf (1, 2) is set in a lockable manner. 3. Adjustable headrest according to claim 2, c h a r a c t e r i z e d i n that the locking bracket (9) comprises at least two recesses (11) and that the control device (8) comprises a protruding section (14) which is adapted to cooperate with one of said protrusions (11) for lockable adjustment. 4. Adjustable headrest according to any one of the preceding claims, wherein at least the first part (4) supports a headrest (10), c h a r a c t e r i z e d i n that said control device (8) extends essentially within the boundary surface of the headrest (10). 5. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that the control device (8) is pivotally arranged about an axis of rotation (12) which is essentially parallel to the axis of rotation (5) of the first part (4) in relation to the second part (1, 2) . 6. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that the control device comprises a first generally elongated section (8) and a second section (13) which protrude essentially radially from the axis of rotation (12) of the control device (8), said protruding section (14) protruding essentially perpendicularly from the second section (13). 7. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that the control device (8) is provided with a first elongated section extending essentially along the extension of the headrest (10) and a second elongated section extending essentially across the extension of the headrest (10). 8. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that the control device (8) is manufactured from magnesium or a corresponding light-weight material. 9. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that it comprises a spring element (15) for actuating the control device (8) in a direction where said protruding section (14) engages in one of said recesses (11). 10. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that said control device (8) is connected with a counterweight (15) arranged with the essential part of its weight below the axis of rotation (12) of the control device (8). 11. Adjustable headrest according to any one of the preceding claims, c h a r a c t e r i z e d i n that the second part (1, 2) comprises at least one post (2) to be mounted in a backrest (3). 12. Adjustable headrest according to claim 1, c h a r a c t e r i z e d i n that the control device (18, 20) comprises an electrical switch (18, 19) which is connected to a solenoid arrangement (20) adapted to cooperate with a locking bracket (22) which is pivotally arranged in relation to said solenoid arrangement (20), whereby a predetermined angular position of the first part (4) in relation to the second part (1, 2) is set in a lockable manner.

Inventors: PILHALL STIG, PILHALL, STIG
Applicants: PILHALL STIG, VOLVO AB, AB VOLVO, PILHALL, STIG
Application year: 1996
Main classification: B60N2
IPC codes: A47C7, B60N2