JP5684934B1 - Headrest - Google Patents

Abstract

A headrest that lowers the head support when not in use to secure a driver's rear view and that adjusts the posture of the headrest that raises the head support at the time of use to ensure necessary and sufficient shock absorption performance. A head support 1 includes a front / rear adjustment mechanism having a brake function that adjusts the distance from the passenger's head by swinging back and forth with the upper part as a fulcrum and restricts backward rotation, Built-in damper mechanism that moves and absorbs shocks, and ON-OFF switching mechanism that switches between forward and backward adjustment mechanism and damper mechanism operation, lower rotation with the upper part as a fulcrum, downward The headrest is characterized in that the headrest 1 prevents the driver's rear view from being obstructed by combining the depression. [Selection] Figure 1

Description

  The present invention relates to a headrest that lowers a head rest when not in use to ensure a driver's rear view and raises the head rest when in use.

  The passenger seat and rear seat headrests have the problem of limiting the driver's rear view when not in use by passengers. For this reason, a headrest that can be used in the same manner as in the past has been proposed in which the head support is lowered to ensure a driver's rear view when not in use, and the head support is raised during use (Patent Documents 1 to 6). ).

  The headrest disclosed in Patent Document 1 has a configuration in which an upper portion (upper end side) is supported by a stay (attachment member) so that the lower portion (lower end side) can be rotated in the front-rear direction, and includes a bulging portion on the rear surface side (patent Reference 1 [0008]), if the head rest is lowered and lowered, the bulging portion abuts on the upper surface of the seat back and the lower portion protrudes forward, and if the head rest is raised and raised, it bulges from the upper surface of the seat back. The protruding part can be separated and the lower part can be retracted (Patent Document 1, [0008]). As a result, in a state where the head support is laid down and lowered, the lower part protruding forward becomes an obstacle when the passenger is seated, and the possibility that the passenger is seated in the state is reduced (Patent Document 1 [0012]. ).

  The headrest disclosed in Patent Document 2 includes a stay including a connecting portion (vertical leg portion) and a straight portion (horizontal portion), a frame that rotates around the connecting portion, and a frame that is extrapolated to the stay. The main body of the frame is swayed down with a configuration having a coil spring that applies a braking force to the rotation (Patent Document 2, [0005]). As a result, the main body of the frame is shaken down and is stabilized gravitationally, and the front and rear movements of the head support incorporating the frame become smooth, thereby contributing to ensuring passenger safety. Further, an advantage that the tightening force of the coil spring can be adjusted is also cited (Patent Document 2, [0008]).

  The headrest disclosed in Patent Document 3 is a vertical width obtained by raising the bottom surface of the front pillow portion relative to the front pillow portion relative to the front pillow portion having a predetermined area shape that can be supported from the head of the passenger (seater) to the neck. A small rear pillow part is provided, and the head support (rear pillow part) that has a substantially lateral shape when the front pillow part is pushed forward is lowered to the top surface of the seat back at the rear pillow part, and the height can be adjusted to a low level. (Patent Document 3 [0007]). Thus, it is possible to maintain the same feeling as a normal headrest and to secure the driver's rear view when no passenger is present (Patent Document 3, [0008]).

  The headrest disclosed in Patent Document 4 includes a head support cover (headrest frame) hinged to a connecting portion of the stay (the upper end of the stay) so as to be swingable, and a return for returning the head support cover to the front side. When the head of a passenger (seat) is received by a spring, the head is swung against the return spring and the lower part of the head rest (headrest) is lowered backward (Patent Document 4, [0004]) . As a result, since the head support at the time of use does not protrude, it can be avoided that the passenger feels an unpleasant foreign body, and the height of the seat back can be reduced when not in use (Patent Document 4, [0011]).

  The headrest disclosed in Patent Literature 5 includes a headrest (headrest) disposed in an upright position on an upper portion of a seatback, and the seatback so that the headrest moves downward and can be moved backward. The upper end of the head support is pivotally supported on the stay by a pivotal support so that the lower end side of the head support moves forward and can be rotated backward. (Patent Document 5 [0015] [0016]). Thus, if the head support is pivoted forward and backward greatly forward and downward, the rear field of view can be sufficiently widened (Patent Document 5, [0019]).

  The headrest disclosed in Patent Document 6 is configured such that the upper end of a cover (frame) built in the head support is wound around the connecting portion (horizontal support bar portion) of the stay to form a connecting portion, and the left and right sides of the lower end of the cover are It is the structure which shape | molds in the annular part surrounding the support | pillar (vertical support bar part) of the said stay, and generates a latching force between the said annular part and the said support | pillar (patent document 6 [0005]). As a result, the number of components of the headrest can be minimized, the shape of the cover, which is a strength component, can be minimized, and the weight can be reduced (Patent Document 6 [0012]).

JP 2010-188989 JP 2010-213587 JP 2008-043523 A JP2004-229969 JP 2002-272554 A JP 2001-275781

  When the headrest disclosed in Patent Document 1 is lowered, the lower part protrudes to inform the passenger that the headrest is not in use. However, the head support raised at the time of use cannot be freely adjusted to the front-rear position optimal for the passenger at an arbitrary height. The same applies to the headrest disclosed in Patent Document 3, Patent Document 4, and Patent Document 6. In Patent Document 2 and Patent Document 5, there is a description (Patent Document 2 [0010], Patent Document 5 [0032] [0033]) in which the front / rear position of the head support can be adjusted according to the height of the passenger. The front-rear position of the head receiver having an arbitrary height cannot be adjusted only by changing the front-rear position according to the height of the head receiver.

  Further, the headrest disclosed in Patent Literature 1, Patent Literature 3, Patent Literature 5 and Patent Literature 6 absorbs an impact caused by a vehicle collision or the like only by elastic deformation of the head support. The headrest disclosed in Patent Document 4 only gives a return spring built in the head support to return the head support that has been rotated rearward under the impact of the passenger's head to the original posture. Again, shock absorption is due to elastic deformation of the head support itself. On the other hand, the headrest disclosed in Patent Document 2 can be expected to absorb shocks according to the amount of rotation of the head support because the coil spring built in the head support exerts a braking force. I can't lower my position.

  In this way, the conventional headrest that adopts a posture change that protrudes the lower part of the head support forward to lower the head support and secure the driver's rear view when not in use, when the head support is raised The position (front and rear position) of the vehicle could not be adjusted arbitrarily, and there was no consideration for reducing the speed and acceleration at the time of collision, and there was not enough consideration for shock absorption in the event of a vehicle collision, etc. . Therefore, in the headrest that lowers the head rest when not in use to secure the driver's rear view and raises the head rest when in use, the posture is arbitrarily adjusted to ensure the necessary and sufficient shock absorption performance ,investigated.

The headrest that was developed as a result of the study was composed of a head support wrapped with a soft foam and a stay that supported the head support and moved up and down from the upper surface of the seat back, and was attached to the seat back of the vehicle. The head support is composed of a head receiving side member that is integral with the head support, a stay side member that is attached to the stay, and a coil spring that is externally fitted to the drum of the stay side member. and it was adjusted before and after the distance between the head of the Reno customers by the front and back swing, and front and rear adjustment mechanism with a brake function of regulating the backward rotation by a coil spring tightening the drum, generated by tightening the coil spring to drum friction a damper mechanism for absorbing the impact by rotating the collision by braking control utilizing resistance, loosening cam provided on the stay member pushes the free end of the coil spring, the head receiving side portion All spring locks mechanism provided serves as a ON-OFF switching mechanism for switching the operation and non-operation of the front and rear adjustment mechanism and damper mechanism by the so hooked free ends to create a state of loosening the coil spring hooking piece It is a headrest that is built-in and prevents the rear view of the driver from being obstructed by the head support by combining the lower part rotation with the upper part as a fulcrum and the downward depression. .

  The headrest of the present invention is applied to a seat back of a passenger seat or a rear seat. The rotation angle of the headrest, the rotation angle of the front / rear adjustment mechanism, and the rotation angle of the damper may be the same or different. For this reason, the rotation center of the headrest, the rotation center of the longitudinal adjustment mechanism, and the rotation center of the damper may be the same or different. In the case where the stay has a configuration in which two straight portions are connected by a connecting portion, the center of rotation of the headrest, the center of rotation of the front / rear adjustment mechanism, and the center of rotation of the damper and the center of the connecting portion of the stay are the same. But you can leave.

Bas Nerokku mechanism is composed of a stay-side member and the head-receiving member is protruded drum for winding coil springs, the fixed end of the coil spring is fixed to the head receiving-side member, the forward limit position of the head-receiving member A stay cam is provided with a loosening cam with which the free end of the coil spring abuts and a reset cam with which the free end abuts at the rear limit position of the free end, and is hooked at a position corresponding to the loosening cam of the head receiving member. The structure which provided the stop piece can be illustrated.

  The spring lock mechanism may be mounted in a state in which the drum of the stay side member is slit and has a rotation restricting piece and is not rotatable on the connecting portion of the stay. The spring lock mechanism is composed of a head receiving member that protrudes a drum around which a coil spring is wound and a stay side member. The fixed end of the coil spring is fixed to the stay side member, and the drum, the loosening cam, and the reset cam are received on the head receiving portion. It may be assigned to the side member, and the latching piece may be assigned to the stay side member.

  The head support should be 70mm or more from the front of the seat back when pushed down (stored). Since the head support pivots the lower part with the upper part as a fulcrum, the lower part often protrudes the largest from the back seat front, but the middle connecting the upper part and the lower part projects the largest from the back seat front depending on the side view shape. In some cases.

  ADVANTAGE OF THE INVENTION By this invention, the headrest provided with the back-and-forth adjustment mechanism and the damper mechanism which prevents that a driver | operator's back view is obstructed by the head support can be provided. When the head rest secures an adjustment width of 30 mm to 40 mm by the front and rear adjustment mechanism, and the head rest is brought closer to the passenger's head, the kinetic energy generated when the head collides can be greatly reduced. Further, the head support absorbs the collision energy due to the collision of the head by the damper mechanism, and not only protects the passenger, but also prevents the members around the headrest from being damaged.

  If the front / rear adjustment mechanism is a spring lock mechanism, the spring lock mechanism can also serve as a damper mechanism, and an on-off switching mechanism that switches between the on / off operation of the front / rear adjustment mechanism and the damper mechanism is built in for operation. It is possible to simplify the apparatus configuration, reduce the weight, and reduce the cost, such as omitting the push button and lever. In addition, by supporting the upper part of the head support on the stay as a fulcrum and rotating the head support in front of the stay, the impact from the head support can be directly received by the stay at the rear limit position. This is advantageous in terms of structural strength. As a result, the strength of the members required for the longitudinal adjustment mechanism and the damper mechanism can be reduced, which also leads to simplification of the device configuration, weight reduction, and cost reduction.

It is the disassembled perspective view which looked at the head receptacle (state before wrapping with a soft foam) from the front about an example of the headrest to which this invention is applied. It is a disassembled perspective view of the spring lock mechanism of this example. It is sectional drawing showing the time of use (a) of the headrest of this example, and the time of non-use (storage) (b). FIG. 10 is a cross-sectional view illustrating when the headrest of another example 1 is used. 12 is a cross-sectional view illustrating the use of a headrest of another example 2. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, for example, the headrest of the present invention is made of a resin (for example, PP, PE) cover 12 and 12 in which a resin head receiving member 11 is integrated, and soft foam such as urethane. A head-shaped support 1 wrapped in a body 13 and covered with a skin 14 such as leather is folded, and a metal pipe is bent and two straight portions 23, 23 are connected by a connecting portion 21. The upper portion of the head support 1 can be moved up and down from the upper surface of the back 4 (see FIG. 3 and below) so that the center of the circular arc portion at the upper end of the straight portion 23 serves as a rotation fulcrum (see FIG. 3 and below). It is configured to rotate freely. The stay 2 is provided with a step (not shown) for vertical adjustment in the straight portion 23, and moves up and down in units of the step.

  The headrest of this example constitutes a spring lock mechanism that also serves as a front / rear adjustment mechanism and a damper mechanism. The spring lock mechanism of this example includes a head receiving member 11 that is integral with the cover 12 of the head receiving member 1, a stay side member 22 that is attached to the connecting portion 21 of the stay 2, and a drum 223 of the stay side member 22. And a coil spring 3 to be fitted. The lock spring mechanism is generated by tightening a coil spring 3 having a diameter of 2% to 4% smaller than that of the drum 223 to the drum 223 and a head receiving member 11 that rotates about a rotation fulcrum with respect to the stay side member 22. The brake is controlled by a frictional resistance (referred to as a spring brake action or a spring lock action). The front / rear adjustment mechanism is constituted by a coil spring 3 that is fastened to the drum 223, and the ON-OFF switching mechanism is a state in which the lock spring 3 of the front / rear adjustment mechanism is loosened, and includes a latching piece 112, a loosening cam 221 and a reset cam 222. The head receiving side member 11, the stay side member 22 and the coil spring 3 are configured by

  The coil spring 3 is tightened to a drum 223 that rotates the lower part of the head support 1 backward about the rotation fulcrum, and is loosened with respect to the drum 223 that rotates the lower part forward about the rotation fulcrum. Thereby, the rotation of the head receiver 1 that rotates the lower part backward is restricted, and conversely, the rotation of the head receiver 1 that rotates the lower part forward is free. In particular, the present invention utilizes the brake control function as a damper mechanism. The braking force of the coil spring 3 used as a damper mechanism depends on various factors, but is mainly determined by the wire diameter and the number of turns of the coil spring 3. For example, when dealing with an impact of 500 N to 800 N applied to the head receiver 1, the coil spring 3 used in the spring lock mechanism has a wire diameter of 3.5 mm and a winding number of 4 to 6 turns.

  The stay side member 22 is integrally provided with a drum 223 to which the coil spring 3 is fitted, and the connecting portion 21 of the stay 2 is inserted into a through hole 224 provided in front of the drum 223. Thereby, the stay side member 22 is fixed in a position in which the stay side member 22 cannot rotate with respect to the stay 2 and the seat back 4. The head receiving member 11 is rotated in the range of the guide long hole 113 with the connecting portion 21 of the stay 2 inserted through the guide long hole 113 and the central axis of the drum 223 of the stay side member 22 as the rotation fulcrum. . As a result, the head receiver 1 constituted by integrating the head receiving member 11 with the cover 12 also rotates within the range of the guide slot 113.

  The coil spring 3 is wound around the drum in a tightened state, and the drum 223 is tightened against the rear load to control the rotation, and the forward rotation is loosened and the winding direction (right-handed or left-handed) is selected. To do. At this time, if the drum 223 of the stay side member 22 is a resin material (for example, POM), the rotation can be permitted if the impact applied to the head receiver 1 exceeds a certain level (for example, 500 N to 800 N). Thereby, when an excessive impact is applied to the passenger's head, the head support 1 is rotated to absorb the impact, thereby reducing damage caused by the impact.

  Next, the operation mechanism will be described. The coil spring 3 is fixed by inserting the fixed end 31 into the spring fixing portion 111 of the head receiving member 11. The stay side member 22 includes a loosening cam 221 with which the free end 32 abuts at a front limit position of the head receiving member 11 (for example, a lower right direction in FIG. 2), and a rear limit position of the head receiving member 11 ( For example, a reset cam 222 with which the free end 32 abuts is provided in the upper left direction in FIG. The head receiving member 11 is provided with a latching piece 112 at a position corresponding to the loosening cam 221.

  When the lower part of the head support 1 in use is rotated to the front limit position around the rotation fulcrum, the loosening cam 221 of the stay side member 22 pushes the free end 32 most recently, so that the coil spring 3 is loosened. Pressed and rewound several millimeters. When the free end 32 pressed by the loosening cam 221 moves in the axial direction and is hooked on the hooking piece 112 of the head receiving member 11, the coil spring 3 is held in a loosened state, The brake that restricts the rotation of 1 is released (brake release state = OFF state). The head receiver 1 of this example uses a spring lock mechanism as a front / rear adjustment mechanism, adjusts the front / rear position of the lower part within the range until the brake control is released, and reduces the distance from the passenger's head to greatly reduce the impact. Plan.

  The head support 1 is in a brake release state (OFF state) while the free end 32 of the coil spring 3 is hooked on the hooking piece 112, and when the lower part is rotated downward and pushed down, It can be put into the storage state (see FIG. 3B). When the head support 1 is lifted and rotated to the rear limit position from the brake release state (OFF state), the free end 32 that contacts the reset cam 222 of the stay side member 22 is released from the hooking piece 112 and again. The brake control state (ON state) in which the coil spring 3 tightens the drum 223 is entered.

  The headrest of this example is used by pulling up the stay 2 from the upper surface of the seat back 4 as seen in FIG. At this time, if the lower part of the head receiver 1 is rotated forward and the distance is reduced and approached to the passenger's head (not shown), the passenger's head collides with the head receiver 1 when the vehicle collides. Acceleration can be reduced. And the head receiver 1 which a passenger's head (illustration omitted) collides and rotates a lower part back is a shock when a lock spring mechanism works as a damper mechanism and a passenger's head collides with the head receiver 1. (See the white arrow in FIG. 3A).

  Further, the headrest of this example is applied to the passenger seat or the rear seat, and as shown in FIG. 3B, when the spring lock mechanism is in a brake release state (OFF state), the back of the head support 1 The stay 2 can be pulled down until it comes into contact with the upper surface of the seat back 4, and can be lowered by the height H of the head support 1 (see the phantom line in FIG. 3B). Thereby, a driver | operator's back view can be ensured.

  Since the head receiver 1 in the retracted state protrudes from the lower part to the front and protrudes by the length L, it is an obstacle when the passenger tries to sit as it is, and the head receiver 1 is not used by the passenger when not in use. Arouse. And the said passenger is made to recognize that it raises the head receiver 1 and uses it at the time of use, and the set leak of a headrest is prevented. From this, it is desirable that the protruding length L of the lower portion of the head receiver 1 is 70 mm or more.

  The headrest of the above example (see FIGS. 1 to 3) uses a head support 1 having a side view shape that is bent from an upper part to a lower part that is pivotally supported. Also good. As shown in FIG. 4, the headrest of another example 1 includes the head receiving member 11 and the stay side member 22 of a spring lock mechanism that includes a head receiving member 11, a stay side member 22, and a coil spring (not shown). The connecting portion 21 of the stay 2 is inserted into each of the guide long hole 113 and the through hole 224, and the upper portion of the head support 1 that is linear in a side view is rotated around a rotation fulcrum set with respect to the stay 2. It is supported freely.

  Similarly to the headrest of the above example (see FIGS. 1 to 3), the headrest of another example 1 brings the head receiver 1 in use close to the passenger's head (not shown), and the passenger's head is The impact when colliding with the head receiver 1 can be reduced. Further, the built-in spring lock mechanism functions as a damper mechanism, and when the head of the passenger collides with the head receiver 1, the head receiver 1 rotates the lower part backward to absorb the impact. Then, when the head support 1 is not in use (see FIG. 3B), the lower part protrudes forward from the front surface of the seat back 4, and the head support 1 is lowered to secure the driver's rear view. Can alert passengers when not in use.

  Further, as shown in FIG. 5, the headrest of another example 2 matches the rotation fulcrum of the spring lock mechanism with the center position of the connecting portion 21 of the stay 2, and the head receiving side member 11, the stay side member 22, and The coil spring 3 of a spring lock mechanism composed of the coil spring 3 is wound around the slit drum 225. The headrest according to another example 2 is formed by sealing the soft resin sheet 131 and the skin so that the support member 114 provided on the head receiving member 11 is covered with the soft resin sheet 131 so as not to enter inside the soft resin sheet 131. A soft foam 13 is formed by injecting a foaming agent between the two. Thus, the cover 12 used in the above example (see FIG. 1 and others) is simplified to reduce the weight of the head receiver 1 and reduce the manufacturing cost. The support member 114 prevents the soft resin sheet 131 from being recessed against the pressure of the foaming agent.

  The headrest of another example 2 also has a spring lock mechanism and an ON-OFF switching mechanism similar to those illustrated above (see FIG. 1 and others). A hard head receiving member 11 is used on the front side where the passenger's head contacts, but a soft soft resin sheet 131 is used on the back side where the head does not contact. The slit drum 225 has a cylindrical shape with a part cut in the circumferential direction, and has a larger diameter than the connecting portion 21 of the stay 2 after bending (two to three times the diameter of the stay 2). A rotation restricting piece 226 that is externally fitted to 21 and provided at a portion facing the surface of the connecting portion 21 is engaged with a corresponding hole of the connecting portion 21 to prevent rotation. The structure for preventing the rotation of the slit drum 225 is not limited as long as the rotation can be prevented. The slot drum 225 of this example is provided with a slot for assembling to the stay 2 after bending, and the decrease in the frictional force due to the slit part is compensated by the increase in the frictional force due to the corner part of the slot part. The brake force of the coil spring 3 is not reduced.

  Similarly to the headrest illustrated in the above example (see FIGS. 1 to 3), the headrest of the second example also causes the head support 1 in use to approach the passenger's head (not shown), and the passenger's head The impact when colliding with the head receiver 1 can be reduced. Further, the built-in spring lock mechanism functions as a damper mechanism, and when the head of the passenger collides with the head receiver 1, the head receiver 1 rotates the lower part backward to absorb the impact. Then, when the lower part is rotated forward (see FIG. 3 (b)), the head support 1 is projected forward from the front surface of the seat back 4, and the head support 1 is lowered so that the rear of the driver. While securing visibility, passengers can be alerted when not in use.

1 Head holder
11 Head receiving member
12 Cover
13 Soft foam
14 epidermis 2 stay
21 Connecting part
22 Stay side members
23 Straight section 3 Coil spring
31 Fixed end
32 Free end 4 Seat back

Claims (3)

A headrest composed of a head support wrapped with a soft foam and a stay that supports the head support and moves up and down from the upper surface of the seatback, and is attached to the seatback of the vehicle,
The head support
It is composed of a head receiving member integrated with the head receiving member, a stay side member attached to the stay, and a coil spring externally fitted to the drum of the stay side member,
And before and after adjustment mechanism with a brake function of regulating the backward rotation by the upper to adjust before and after the distance between the head of the Reno customers by the front and rear swing that was the fulcrum, and tighten the drum coil spring,
A damper mechanism that absorbs impact by rotating at the time of collision by brake control using frictional resistance generated by tightening a coil spring to the drum ;
The loosening cam provided on the stay side member pushes the free end of the coil spring, and the free end is hooked on the hooking piece of the head receiving side member to create the loosened state of the coil spring. it incorporates all the spring locks mechanism provided serves as a ON-OFF switching mechanism for switching the operation and non-operation of the mechanism,
A headrest characterized in that the headrest prevents the driver's rear view from being obstructed by combining lower part rotation with the upper part as a fulcrum and downward depression. The headrest according to claim 1, wherein the spring lock mechanism is mounted in a state in which the drum of the stay side member is slit and has a rotation restricting piece and is not rotatable on the connecting portion of the stay. 3. The headrest according to claim 1, wherein the headrest protrudes forward by 70 mm or more from the front surface of the seat back when the head support is pushed downward.

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