Patent Grant
9248766
The present invention relates to a headrest stay and an active headrest. In particular, the present invention relates to a headrest stay and an active headrest that are used for a vehicle.
Conventionally, a headrest stay is known, which is supported by a seat back and to which the body of a headrest is fixed. For example, Patent Literature 1 discloses the technique for embedding the curved parts of a stay bent substantially in an inverted U shape into the pillow-like pad of a headrest.
Patent Literature 1: Japanese Patent Application Laid-open No. 8-389
In the case of a stay having a pair of members extending in top and bottom directions of a seat back and a member connecting the pair of members in the direction of vehicle width, as in the case of a stay bent in an inverted U-shape, there is a possibility that a member in the direction of vehicle width may restrict movement of an occupant's head. For example, in the event that another vehicle collides with the vehicle from behind and an occupant's head is consequently supported by a headrest, movement of the head in the top and bottom directions of the seat back may be restricted by a member extending in the direction of vehicle width. Accordingly, there has come to be a demand for a headrest stay that enables smoother movement of the head in the top and bottom directions of a seat back.
The object of the present invention is to provide a headrest stay and an active headrest that are able to restrain restriction of movement of a head in the top and bottom directions of a seat back.
A headrest stay according to the present invention includes a pair of first stay-composing parts extending in top and bottom directions of a seat back of a seat provided in a vehicle, while supported by the seat back, the first stay-composing parts being arranged in different positions in a direction of vehicle width; and a second stay-composing part connecting specific parts of the first stay-composing parts in the direction of the vehicle width, the specific parts extending straight in the top and bottom directions of the seat back; wherein the specific parts face a head of an occupant seated on the seat and a space between the one specific part and the other specific part in the direction of the vehicle width is less than a width of the head of the seated occupant in the direction of the vehicle width, the second stay-composing part does not have a portion located further forward than foremost portions of the first stay-composing parts, and a portion of the second stay-composing part, which portion is between the one specific part and the other specific part in the direction of the vehicle width, is not located further forward than the specific parts, and at least part of the portion is located further rearward than the specific parts and, on a line extending in the top and bottom directions from the front end of each of the specific parts as viewed from the side, includes no member connecting the one specific part and the other specific part in the direction of the vehicle width.
In the headrest stay, in the second stay-composing part, it is preferable that the entire portion between the one specific part and the other specific part in the direction of the vehicle width is located further rearward than the specific parts.
In the headrest stay, it is preferable to further include a plate-like member connecting the one specific part and the other specific part in the direction of the vehicle width and disposed parallel to a plane defined by the one specific part and the other specific part.
An active headrest according to the present invention includes a headrest stay; a cover covering the headrest stay; and a moving mechanism configured to move the headrest stay closer to the seated occupant.
In the active headrest, it is preferable that the moving mechanism is actuated in response to mechanical input and moves the headrest stay at least forward, and an amount that an upper part of the headrest stay in the top and bottom directions is moved forward by the moving mechanism is preferably larger than an amount that a lower part thereof is moved forward by the moving mechanism.
A headrest stay according to the present invention includes a pair of first stay-composing parts extending in the top and bottom directions of a seat back, and a second stay-composing part connecting the specific parts of the corresponding first stay-composing parts in the direction of vehicle width, the specific parts extending straight in the top and bottom directions of the seat back. The specific parts face the head of an occupant seated on a seat. A portion of the second stay-composing part, which portion is between the one specific part and the other specific part in the direction of vehicle width, is not located further forward than the specific parts, and at least part of this portion is located further rearward than the specific parts and, on a line extending in the top and bottom directions from the front end of each of the specific parts as viewed from the side, includes no member connecting the one specific part and the other specific part in the direction of the vehicle width. This yields the effect that the head of a seated occupant is restrained from being caught by the second stay-composing part and hence restriction of movement of the head in the top and bottom directions of the seat back is eased.
A headrest stay according to one embodiment of the present invention will be described below with reference to the drawings. It should be understood that the present invention is not limited to this embodiment. It should also be understood that the compositional elements in the embodiment described below include ones that could easily be anticipated by those skilled in the art and ones that are substantially identical to the compositional elements.
Each first stay-composing part 21 includes: a fixed part 21c provided lowest in the top and bottom directions of the seat back, a specific part 21a provided highest in the top and bottom directions of the seat back, and a connection part 21b connecting the fixed part 21c and specific part 21a. Each fixed part 21c extends in the top and bottom directions of the seat back and is supported by the seat back 31. The fixed part 21c has engagement grooves 21d. While the fixed parts 21c are kept inserted in the seat back 31, engagement projections (not shown) provided on the seat back 31 side engage with these engagement grooves 21d, thereby positioning the fixed parts 21c.
Each specific part 21a extends straight in the top and bottom directions of the seat back. In the present embodiment, the specific parts 21a on both sides in the direction of the vehicle width are provided parallel to each other. The specific parts 21a, 21a face the head of an occupant seated on the seat 30. “The specific parts 21a, 21a face the head of an occupant” means that, for example, it is assumed at a design stage that the specific parts 21a, 21a face the head of a seated occupant. Depending on the body type, posture, or the like, of a seated occupant, there may be a case where the specific parts 21a, 21a and the head of a seated occupant are not parallel with each other. The space W between the one specific part 21a and the other specific part 21a is less than the width of the head of a seated occupant in the direction of vehicle width. The distance between these connection parts 21b, 21b decreases from the fixed parts 21c toward the specific parts 21a and the connection parts 21b, 21b are inclined forward.
The second stay-composing part 22 includes bent parts 23 and a straight part 24. The bent parts 23 are connected to both corresponding ends of the straight part 24, and the end of each bent part 23, which is opposite to the end connected to the straight part 24, is connected to the specific part 21a of the corresponding first stay-composing part 21. Each bent part 23 is inclined rearward toward a higher position in the top and bottom directions of the seat back from the end 23a connected to the corresponding specific part 21a, is then bent in the direction of vehicle width, and is connected to the straight part 24. As described above, the second stay-composing part 22 connects the respective specific parts 21a of the first stay-composing parts 21 in the direction of vehicle width.
In the stay 20, the specific parts 21a and connection parts 21b of the first stay-composing parts 21 and the second stay-composing part 22 are arranged within the case (cover) 11. The case 11 is filled with resin foam, and the body 10 and the stay 20 are thereby fixed. In the forward and rearward directions, the specific parts 21a face a support part 11a of the case 11, which supports the head of a seated occupant. Specifically, of the first stay-composing parts 21, the specific parts 21a are portions located within the case 11, extending straight in the top and bottom directions of the seat back, and able to support the head of a seated occupant via the support part 11a.
In the stay 20 according to the present embodiment, the second stay-composing part 22, which is the upper end of the stay 20, bends away from the specific parts 21a rearwards. Accordingly, as described below, restriction of movement of the head of a seated occupant is eased. First, a description is given of the problem with a conventional headrest, which is that movement of a seated occupant is restricted.
In
If forward acceleration is exerted on the vehicle, as in the event where another car collides with the vehicle from behind, the head H of a seated occupant may be moved rearwards and pressed against a body 110 of the headrest 100. Additionally, rearward inertia may be exerted on the seat and, moreover, the seated position of the occupant may be shifted downwards, with the result that a seat back 131 may tilt obliquely downward (rearwards). Consequently, the seated occupant may try to move toward a higher position in the top and bottom directions of the seat back relative to the seat back 131 and the headrest 100. The head H of the seated occupant may be moved toward a higher position along the specific parts 121a while pressed against the body 110 and supported by the specific parts 121a. In this case, the second stay-composing part 122 is located on the same plane as the pair of specific parts 121a, 121a. Therefore, near the upper end of the stay 120, indicated by a symbol R, the head H of the seated occupant may be caught by the body 110. Consequently, the head H may be turned around an axis in the direction of vehicle width, as shown by arrow Y1, through the portion of the head H caught by the body 110, which is the center of rotation. A symbol H1 indicates the head H before the turn and a symbol H2 indicates the head H after the turn. Accordingly, because movement of the head H of the seated occupant is restricted in the top and bottom directions of the seat back, the seated occupant may feel discomfort, such as his/her head H turning, as described above.
In contrast, in the stay 20 according to the present embodiment, the second stay-composing part 22 does not have a portion further forward than the foremost portions of the first stay-composing parts 21. In the second stay-composing part 22, the portion between one specific part 21a and the other specific part 21a in the direction of vehicle width is not located further forward than the specific parts 21a. In addition, at least part of the second stay-composing part 22 is located further rearward than the specific parts 21a. Accordingly, as illustrated in
Particularly, in the present embodiment, the straight part 24 of the second stay-composing part 22 is connected to the specific parts 21a via the bent parts 23 tilting in a direction opposite to the seated occupant's side from the corresponding specific parts 21a. Thereby, in the second stay-composing part 22, the entire portion between the one specific part 21a and the other specific part 21a in the direction of the vehicle width is located on the side opposite to the seated occupant's side (i.e., rearwards) with respect to the specific parts 21a. Accordingly, the head H of a seated occupant is effectively restrained from being caught when moved in the top and bottom directions of the seat back. This makes it possible to smoothly move the head H in the upward and rearward directions of the seat back. Since the head H of a seated occupant is restrained from being caught, the head H is prevented from being turned around an axis in the direction of vehicle width, as explained below with reference to
As shown in
In the present embodiment, in the second stay-composing part 22, the entire portion between the one specific part 21a and the other specific part 21a in the direction of vehicle width is located on the side opposite to the seated occupant's side with respect to the specific parts 21a. However, the present invention is not limited to this. In the second stay-composing part 22, it is enough for at least part of the portion between the one specific part 21a and the other specific part 21a in the direction of vehicle width to be located on the side opposite to the seated occupant's side with respect to the specific parts 21a; it is preferable that a portion in the intermediate part between the specific parts 21a, 21a in the direction of vehicle width be located on the side opposite to the seated occupant's side with respect to the specific parts 21a.
Additionally, in the present embodiment, the second stay-composing part 22 connects the respective upper ends of the specific parts 21a, 21a in the top and bottom directions of the seat back. However, the present invention is not limited to this. The second stay-composing part 22 may connect other portions of the specific parts 21a, 21a, instead of the upper ends.
A second embodiment will be described with reference to
A headrest 1-2 according to the present embodiment is configured as an active headrest that moves a stay in the direction in which the space between a body and a head H of a seated occupant decreases, for example, in the event where another vehicle collides with the vehicle.
The headrest 1-2 includes: a stay 20 and a body 10, which are the same as those in the first embodiment, and also an active unit (moving mechanism) 40 that moves the stay 20 and the body 10 closer to the head H of a seated occupant. The active unit 40 may be a mechanism that is actuated in response to a mechanical input caused by a seated occupant's being pressed against a seat back 31 as a result of another vehicle's having collided with the vehicle, and consequently moves the stay 20 and the body 10. A trigger (actuating mechanism) that mechanically inputs the active unit 40 is not limited to one that initiates actuation in conjunction with movement of a seated occupant.
For example, a trigger may be one that is able to mechanically input the active unit 40 in response to impact, pressure, acceleration, or the like, caused by another vehicle's colliding with the vehicle, and that may initiate actuation mechanically or under control. Alternatively, the trigger may be one that mechanically inputs the active unit 40 in the event collision is predicted based on, for example, a detection result obtained by a means for detecting a vehicle approaching the vehicle conveying the occupant.
When the trigger is not actuated, the body 10 and the stay 20 are stopped in a position (refer to a symbol 10-1) that may be apart from the head H of a seated occupant within a movable range. Upon actuation of the trigger, the body 10 is moved closer to the head H together with the stay 20 by the active unit 40 (refer to arrow Y3). A symbol 10-2 indicates the body 10 moved toward the head H by the active unit 40. The direction in which the body 10 and the stay 20 are moved at this time is, for example, forward and toward a higher position in the top and bottom directions of the seat back. Thereby, the space between the head H of a seated occupant and the body 10 and hence the amount of rearward movement of the head H decrease. The direction in which the body 10 is moved by the active unit 40 is not limited to this. For example, the direction in which the body 10 is moved by it may be forward only.
In addition, in the headrest 1-2, the second stay-composing part 22 is identical in configuration to that of the stay 20 of the first embodiment. Accordingly, when the head H of a seated occupant is moved in top and bottom directions of the seat back after having contacted the body 10, the headrest 1-2 yields the advantageous effect that restriction of movement of the head H is eased, as in the first embodiment described above. Since the headrest 1-2 is configured as an active headrest, the time for which the seated occupant's head H is supported by the body 10 may be long, as in the event where another vehicle collides with the occupant's vehicle from behind. In this case, the stay 20 that eases restriction of the movement of head H in the top and bottom directions of the seat back can exhibit the effect more efficiently in combination with the active headrest. In order to ease restriction of movement of the head H in the top and bottom directions of the seat back, it is preferable that the body 10 does not incorporate any compositional elements of an airbag or the like.
Additionally, the stay 20, configured as in the first embodiment described above and having a second stay-composing part 22 at least part of which is located further rearward than the specific parts 21a, is effective particularly when the active unit 40 moves the stay 20 at least forwards, and the amount that the upper part of the stay 20 in the top and bottom directions of the seat back is moved forwards by the active unit 40 (refer to a symbol U1 in
A third embodiment will be described. In the third embodiment, only respects different from the embodiments described above will be described.
A stay 50 of a headrest 1-3 according to the present embodiment has, in addition to the configuration of the stay 20 of each embodiment described above, the configuration for easing restriction of movement of the head H of a seated occupant in the top and bottom directions of the seat back.
In
The plate-like member 55 is made of metal or resin or the like and connects the one specific part 51a and the other specific part 51a in the direction of vehicle width. The plate-like member 55 is disposed parallel to a plane defined by the specific parts 51a, 51a and is able to support the head H of a seated occupant. By virtue of the plate-like member 55, the head H of a seated occupant is supported by the plate-like member 55 when the head H is moved rearward and pressed against a body 10. Thereby, when the head H is moved in the top and bottom directions of the seat back relative to the headrest 1-3, the head H can be moved while supported by the plate-like member 55. Accordingly, rearward movement of the head H is restrained, unlike the case where no plate-like member 55 is provided and the head H is moved while supported by the specific parts 51a. As a result, the head H is restrained from being caught by the body 10 (the second stay-composing part 52). Additionally, in the present embodiment, the plate-like member 55 extends up to the second stay-composing part 52, towards a higher part of the seat back. The upper end of the plate-like member 55 is connected to the second stay-composing part 52. Accordingly, restriction of movement of the head H of a seated occupant in the top and bottom directions of the seat back is effectively eased.
Instead of providing the stay 50 with the plate-like member 55, or in addition to the provision of the plate-like member 55, the stay 50 may be extended to a higher part of the seat back.
As the stay 50 is extended to a higher part of the seat back, the second stay-composing part 52 is located in a higher position. This prevents movement of the head H in the top and bottom directions of the seat back from being restricted by the second stay-composing part 52. For example, the stay 50 can be composed such that the second stay-composing part 52 is located highest within the case 11.
It is to be understood that the embodiments described above may be used in combination with one another.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2009/005757 | 10/29/2009 | WO | 00 | 4/26/2012 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2011/052014 | 5/5/2011 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2756808 | Eichorst | Jul 1956 | A |
| 5181763 | Dellanno et al. | Jan 1993 | A |
| 6019424 | Ruckert et al. | Feb 2000 | A |
| 6199947 | Wiklund | Mar 2001 | B1 |
| 6511130 | Dinkel et al. | Jan 2003 | B2 |
| 6604788 | Humer | Aug 2003 | B1 |
| 6631949 | Humer et al. | Oct 2003 | B2 |
| 6631955 | Humer et al. | Oct 2003 | B2 |
| 6655733 | Humer et al. | Dec 2003 | B2 |
| 6719368 | Neale | Apr 2004 | B1 |
| 6749256 | Klier et al. | Jun 2004 | B1 |
| 6789846 | Humer et al. | Sep 2004 | B2 |
| 7017989 | Yamaguchi et al. | Mar 2006 | B2 |
| 7044544 | Humer et al. | May 2006 | B2 |
| 7284794 | Yamaguchi et al. | Oct 2007 | B2 |
| 7530633 | Yokota et al. | May 2009 | B2 |
| 7540562 | Sekida | Jun 2009 | B2 |
| 7621598 | Humer et al. | Nov 2009 | B2 |
| 7758114 | Yokota et al. | Jul 2010 | B2 |
| 20060238010 | Yetukuri et al. | Oct 2006 | A1 |
| 20070246979 | Browne et al. | Oct 2007 | A1 |
| 20080088158 | Yokota et al. | Apr 2008 | A1 |
| 20080284225 | Gauthier et al. | Nov 2008 | A1 |
| 20090021060 | Ishijima et al. | Jan 2009 | A1 |
| 20090102255 | D'Agostini et al. | Apr 2009 | A1 |
| 20100156161 | LaPointe et al. | Jun 2010 | A1 |
| 20130175393 | Udriste et al. | Jul 2013 | A1 |
| Number | Date | Country |
|---|---|---|
| 94 00 352 | Apr 1994 | DE |
| 10 2006 015 786 | Oct 2006 | DE |
| 0 662 404 | Jul 1995 | EP |
| 8 389 | Jan 1996 | JP |
| 2000 203322 | Jul 2000 | JP |
| 2000 270958 | Oct 2000 | JP |
| 2001 191886 | Jul 2001 | JP |
| 2001 333832 | Dec 2001 | JP |
| 2004 57503 | Feb 2004 | JP |
| 2005 206016 | Aug 2005 | JP |
| 2005 287765 | Oct 2005 | JP |
| 2006 69286 | Mar 2006 | JP |
| 2008 206683 | Sep 2008 | JP |
| 2009 23425 | Feb 2009 | JP |
| 2009-179140 | Aug 2009 | JP |
| Entry |
|---|
| Decision of a Patent Grant dated Jul. 19, 2013, issued in Japanese Application No. 2011-538119 (w/English translation). |
| German Office Action issued Apr. 29, 2013, in German Patent Application No. 11 2009 005 335.1 (English translation only). |
| International Search Report Issued Nov. 24, 2009 in PCT/JP09/05757 Filed Oct. 29, 2009. |
| International Preliminary Report on Patentability Issued Feb. 7, 2012 in PCT/JP09/05757 Filed Oct. 29, 2009. |
| Number | Date | Country | |
|---|---|---|---|
| 20120217783 A1 | Aug 2012 | US |
