JP2015231801A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent an occupant from suffering from a whiplash injury at the occurrence of a collision of a vehicle, and to prevent the deterioration of a riding comfort by an inexpensive and simple constitution.SOLUTION: A substantially-rectangular recess 5 having a magnitude covering a vertical range from below up to above a breast of an occupant, and also covering a right-and-left range having a breast width degree is formed at a side opposite to a design surface of a seatback 3 which contacts with a back of the seated occupant, and a depth of the recess 5 is made deeper as progressing toward a lower side. By this constitution, when a body portion of the occupant is pressed backward of a vehicle by an impact of a rear collision, a portion which is thinned in thickness by the recess 5 of the seatback 3 becomes easier to move backwardly more than the other portion of the seatback 3, a deeper sink of the occupant is thereby allowed, the timing of the forward bouncing of the occupant can be delayed, a burden on a neck of the occupant is alleviated, and thus, a whiplash injury can be prevented without causing the deterioration of a riding comfort by an inexpensive and simple constitution.

Description

  The present invention relates to a vehicle seat including a seat cushion and a seat back to which a headrest is attached.

  In general, in a vehicle such as an automobile, a headrest is provided on a seat to protect the head of an occupant from impact caused by a collision, but the head of a seated occupant is actually separated from the headrest, At the time of rear impact, there is a difference between the timing at which the occupant's head moves rearward (rearward with respect to the traveling direction) due to inertial force and the timing at which the occupant's trunk moves toward the rear of the vehicle. When the head bounces back in response to back repulsion, the head moves backward and comes into contact with the headrest, which may cause whipping symptoms in the neck.

  Therefore, conventionally, as shown in FIGS. 4 to 6, the seat cushion 50 a and the seat back 50 b are configured to deepen the occupant deeply into the seat back at the time of a rear collision and delay the timing of the forward rebound. In the seat 50 provided with the headrest 50c, a quadrangular movable portion 51 is provided at a substantially central portion of the seat back 50b. Of the four sides of the movable portion 51, a left slit, a lower side, and a right side excluding the upper side are provided with a left slit 52a and a lower side, respectively. A slit 52b and a right slit 52c are continuously formed, and the entire seat back 50b is covered with a skin 53 so that the slit 52 is not exposed on the side where the occupant is seated. Thus, when the occupant's torso portion is pressed rearward by the impact of the rear impact, only the movable portion 51 moves further rearward than the other portions of the seat back 50b, thereby causing the occupant to sink deeper. Proposal to reduce the burden on the neck by allowing the occupant to rebound forward and thereby keeping the body part still depressed when the head moves backward (For example, refer to Patent Document 1).

Japanese Patent No. 3201591 (see paragraphs 0016 to 0029 and FIGS. 1 to 7)

  However, in the thing of above-mentioned patent document 1, since the seat back 50b becomes discontinuous by slit 52a, 52b, 52c, the part of the movable part 51 moves also in a normal seating state, and it causes deterioration of riding comfort, If the impact at the time of the collision is large, there is a possibility that the entire movable part 51 is torn from the seat back 50b and completely separated and the seat back 50b cannot be reused.

  SUMMARY OF THE INVENTION An object of the present invention is to make it possible to reliably prevent whipping of an occupant when a vehicle collision occurs and to prevent deterioration in ride comfort with an inexpensive and simple configuration.

  In order to achieve the above-described object, the vehicle seat of the present invention is a vehicle seat including a seat cushion and a seat back to which a headrest is attached. A recess formed in a range from the upper end to the lower end of the occupant's chest on the surface opposite to the surface, and the recess is formed so that the depth toward the design surface side increases toward the bottom. (Claim 1).

  According to the first aspect of the present invention, on the surface opposite to the design surface of the seat back where the back of the seated occupant contacts, toward the design surface as it goes downward over the range from the upper end to the lower end of the chest of the occupant. When the occupant's torso part is pressed to the rear of the vehicle due to the impact of the rear impact, the part where the thickness is reduced by the recessed part of the seat back is more than the other part of the seat back. Further, it becomes easier to move backward, allowing deeper sinking of the occupant, delaying the timing of the occupant's rebounding forward, and reducing the burden on the neck. It is possible to reliably prevent occupants from whipping when a collision occurs, and to prevent deterioration of the ride comfort. It becomes possible.

It is a side view showing the outline of one embodiment of the vehicular seat concerning the present invention. 2 is a side view of a portion of one embodiment. FIG. FIG. 3 is a partial rear view of an embodiment. It is a perspective view of a prior art example. FIG. 5 is a partial cutaway side view of FIG. 4. FIG. 5 is a partial plan view of FIG. 4.

  An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. The front, rear, left, and right in the present embodiment mean front, rear, left, and right when viewed in a seated state.

  FIG. 1 shows a seat 1 employed in a vehicle. The seat 1 is composed of a seat cushion 2 and a seat back 3 that is variably coupled to the seat cushion 2 and the headrest 4 is attached to the seat back 3. Is detachably attached.

  As shown in FIGS. 2 and 3, the design surface (front surface) and the opposite surface (back surface) of the seat back 3 with which the back of the seated occupant contacts are in the vertical range from the top to the bottom of the occupant's chest. Thus, a substantially rectangular recess 5 having a size covering the left and right range of the chest width is formed, and the recess 5 is formed so that the depth toward the design surface side becomes deeper as it goes downward. The seat back 3 is encased by a skin (not shown). Further, reference numeral 6 in FIG. 2 denotes a part of the seat back frame constituting the seat back 3.

  At this time, in order to deepen the sinking of the occupant at the time of the rear collision, it is desirable that the deepest position of the recess 5 corresponds to the position where the sinking of the occupant's chest in the seated state has the greatest sinking. Moreover, the recessed part 5 should just be formed in the depth to the design surface side deeply as it goes below, and is not restricted to the shape of a side view cross section as shown in FIG. It may be in the shape of a letter bent at an acute angle.

  Therefore, according to the above-described embodiment, on the back surface opposite to the design surface of the seat back 3 with which the back of the seated occupant comes into contact, the vertical range from the top to the bottom of the occupant's chest and the lateral range of the chest width. When the concave portion 5 having a substantially rectangular shape is formed and the depth of the concave portion 5 is increased as it goes downward, the occupant's torso portion is pressed rearward by a rear impact. In addition, the portion of the seat back 3 that has been reduced in thickness by the concave portion 5 is more easily moved rearward than the other portions of the seat back 3, allowing the occupant to sink deeper and allowing the occupant to bounce forward. The timing can be delayed, and as a result, the burden on the neck of the occupant can be reduced, and the lashing of the occupant can be reliably prevented in the event of a vehicle collision with an inexpensive and simple configuration. Ri comfort of the deterioration can be prevented. In addition, the seat back 3 can be reused without causing the recess 5 to tear and separate as in the conventional case due to the impact on the passenger at the time of the rear impact.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, a case has been described in which the concave portion 5 having a size ranging from the top to the bottom of the chest of the seated passenger and extending to the left and right of the chest width is formed. A plurality of concave portions may be formed so as to be arranged in the left-right direction of the seat back 3. At this time, each concave portion is formed in such a manner that the depth toward the design surface side becomes deeper as it goes downward.

  Further, the present invention can be applied to all seats having a headrest, which are seats for vehicles such as automobiles.

DESCRIPTION OF SYMBOLS 1 ... Seat 2 ... Seat cushion 3 ... Seat back 4 ... Headrest 5 ... Recess

Claims (1)

In a vehicle seat comprising a seat cushion and a seat back to which a headrest is attached,
On the surface opposite to the design surface of the seat back where the back of the seated occupant comes into contact, a recess formed over a range from the upper end to the lower end of the chest of the occupant,
The vehicular seat is characterized in that the concave portion is formed so that the depth toward the design surface side becomes deeper as it goes downward.

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