JP2018086873A - Headrest and vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make axial compressive force in an insertion direction hard to be applied to a headrest stay even if an input load from a rear side is applied to a headrest.SOLUTION: A vehicular seat 1 includes a headrest 3 mounted in an upper section of a seat back 2. The vehicular seat includes: a headrest stay (stay) 10 which has a straight section 11 extending downward from the inside of the headrest 3 and a bending section 12 bending and extending to the front from the straight section 11 in the headrest 3; a headrest support 30 which is provided in an upper section of the seat back 2 and is positionally fixed when the straight section 11 of the stay 10 is inserted from an upper side; and a protruding member 20 which is connected to the bending section 12 of the stay 10 and protrudes so that an input load P from a rear side in the headrest 3 can be received precedently to the stay 10.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a headrest and a vehicle seat. Specifically, the present invention relates to a headrest mounted on an upper portion of a seat back and a vehicle seat including the headrest.

  Conventionally, in a vehicle seat, a configuration in which a headrest is mounted by inserting a pair of left and right headrest stays with respect to an upper portion of a seat back is known (Patent Document 1). Each of the pair of left and right headrest stays described above is inserted into the corresponding cylindrical headrest support embedded in the upper part of the seat back, so that they are locked and fixed in position by the hooking structure of the claws. It is supposed to be retained.

JP 2014-233351 A

  In the above prior art, a heavy load such as the head of an occupant of the rear seat is applied to the headrest from the rear side due to the occurrence of a frontal collision of the vehicle, so that an axial compression load in the insertion direction is applied to each headrest stay. There is a risk that the fixed position of the stay will collapse due to damage. The present invention was devised to solve the above problems, and the problem to be solved by the present invention is that the axial compression force in the insertion direction is applied to the headrest stay even if there is a load input from the rear to the headrest. It is to make it difficult to hang.

  In order to solve the above problems, the headrest and vehicle seat of the present invention take the following means.

  1st invention is the vehicle seat provided with the headrest with which the upper part of a seat back is equipped, and it bends forward from the extension part inside the headrest and the extension part which extends below from the inside of the headrest. A headrest stay provided with a bent portion extending, a stay fixing portion provided at an upper portion of the seat back, the extension portion of the headrest stay being inserted and fixed from above, and a headrest coupled to the bent portion of the headrest stay And a projecting member that projects in a shape that can receive an input load from the rear of the headrest stay prior to the headrest stay. The overhang member acts as a bending force that transmits an input load received from the rear to the bent portion and pushes the extended portion forward.

  According to the first aspect of the present invention, by setting the overhang member, it is possible to make it difficult for axial compression force in the insertion direction to be applied to the extension portion of the headrest stay even if there is a load input from the rear to the headrest.

  The second invention is the following configuration in the first invention described above. The headrest stay has a shape in which a bent part extends forward from an upper end of the extending part. The overhang member is coupled to a portion extending forward beyond a connection portion connected to the extension portion in the bent portion.

  According to the second aspect of the invention, it is possible to make the load from the rear input to the projecting member easily act on the bent portion as a bending force that pushes and tilts the extended portion forward.

  The third invention is the following configuration in the second invention described above. The bent portion has a curved portion that extends curved from the upper end of the extending portion to the front and a straight portion that extends linearly from the tip of the curved portion to the front. A projecting member that extends in a straight line is applied in a shape extending along the straight part of the bent portion, and a projecting part extends upward from the rear end of the joint part and projects to the upper region of the curved part. And a jumping portion.

  According to the third aspect of the invention, the overhanging member can be in a state of overhanging in a region where it is easy to receive an input load from the rear, while being more appropriately coupled to the bent portion of the headrest stay.

  According to a fourth invention, in any one of the first to third inventions described above, the following configuration is adopted. The headrest stay is configured to have a pair of left and right extending portions and bent portions. The overhanging member is configured to be provided in a state where both ends are supported integrally between a pair of left and right bent portions.

  According to the fourth aspect of the invention, the load from the rear input to the overhang member can be transmitted to each bent portion of the headrest stay in a stable manner with a good balance on the left and right.

  A fifth invention is a headrest mounted on an upper portion of a seat back, and includes an extending part extending downward from the inside of the headrest and a bent part extending bent forward from the extending part inside the headrest. A headrest stay, and a projecting member that is coupled to a bent portion of the headrest stay and projects an input load from the rear to the headrest so as to be received prior to the headrest stay. An input load that the overhanging member receives from the rear is transmitted to the bent portion, and acts as a bending force that pushes and tilts the extended portion forward.

  According to the fifth aspect of the present invention, by setting the overhang member, it is possible to make it difficult for the axial compression force in the insertion direction to be applied to the extension portion of the headrest stay even if there is a load input from the rear to the headrest.

1 is a perspective view illustrating a schematic configuration of a vehicle seat of Example 1. FIG. It is a side view of FIG. It is a side view showing the state where the impact load accompanying the collision occurrence of a vehicle was inputted into the headrest from the rear. It is a side view showing the state where the headrest stay was pushed forward by the load input.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

<< About schematic structure of sheet 1 >>
First, the structure of the seat 1 (vehicle seat) and the headrest 3 according to the first embodiment will be described with reference to FIGS. In the following description, when directions such as front / rear, up / down, left / right, and the like are indicated, the directions shown in the drawings are indicated. The seat 1 of the present embodiment is configured as a second row seat of an automobile having a three row seat. As shown in FIGS. 1 to 2, the seat 1 includes a seat back 2 that serves as a backrest portion for a seated occupant, a seat cushion (not shown) that serves as a seating portion, and a headrest 3 that serves as a headrest portion. It has a configuration.

  The seat back 2 described above is supported by connecting lower end portions of the left and right sides thereof to rear end portions of the left and right sides of the seat cushion via recliners (not shown). The headrest 3 is mounted and provided in a state where the headrest 3 is inserted into the upper surface portion of the seat back 2 from the upper side and fixed in position. Specifically, the headrest 3 has a pair of left and right cylindrical portions in which a pair of left and right straight portions 11 of a headrest stay 10 extending from a lower surface portion of the headrest 3 is embedded in the upper surface portion of the seat back 2. By being inserted into the insertion hole 31 of each headrest support 30 from the upper side, the headrest support 30 is attached to the headrest support 30 and is fixed to the upper surface of the seat back 2. Here, each straight portion 11 corresponds to an “extending portion” of the present invention.

  More specifically, the headrest 3 described above is formed on the outer peripheral portion of the left straight portion 11 by inserting each straight portion 11 of the headrest stay 10 into the corresponding insertion hole 31 of each headrest support 30. A locking claw 32 provided in the headrest support 30 on the same side is elastically fitted into the locking groove 11A and locked. Due to the above-described locking, further movement in the insertion direction into the headrest support 30 on each side of the straight portion 11 on each side of the headrest stay 10 described above is restricted. As a result, the headrest 3 is held in a state of being fixed to the upper surface portion of the seat back 2.

  The position fixing state of the headrest stay 10 by the locking claw 32 of the left headrest support 30 described above is released when the knob 33 provided on the headrest support 30 on the same side is pushed from the side by the user. ing. As a result of the release, each straight portion 11 of the headrest stay 10 can be moved further deeply into and out of each headrest support 30. Here, the structure of each headrest support 30 having the locking claw 32 on the left headrest support 30 described above corresponds to the “stay fixing portion” of the present invention.

<< Specific Configuration of Headrest Stay 10 >>
The headrest stay 10 described above is formed of one circular steel pipe member that is bent into a shape that is substantially U-shaped when viewed from the front. Specifically, the headrest stay 10 is bent into a front-lowering shape from a pair of right and left straight portions 11 extending in a straight shape in the height direction and the upper ends (connection portions 12Ab: see FIG. 2) of each straight portion 11. A pair of left and right bent portions 12 and a bridging portion 13 that straightly connects the end portions of the bent portions 12 extending in the left-right direction. Yes. More specifically, each of the pair of left and right bent portions 12 described above includes a curved portion 12A that is bent into an arc shape so as to rise and descend from the upper end to the front side of each straight portion 11, and the same curved portion. And a straight portion 12B extending linearly in the front-down direction from the tip of 12A.

  In the headrest stay 10 described above, the upper region including each bent portion 12 and the bridging portion 13 on the upper side from the middle portion in the length direction of the right and left straight portions 11 is integrally embedded in the headrest 3. It is set as the structure. With the above configuration, the headrest stay 10 is provided in a shape in which a region on the lower side from the middle portion in the length direction of the right and left straight portions 11 extends straight downward from the bottom surface of the headrest 3 as a pair. It has been configured. As shown in FIG. 1, the headrest 3 described above elastically receives a load received from the outside in a state where the upper region of the headrest stay 10 described above is widely covered from the outer peripheral side by a pad material made of urethane foam (not shown). It is configured to be able to.

  However, the headrest 3 described above, for example, when receiving a heavy load that causes a heavy object to collide from the rear side, such as when a frontal collision of the vehicle occurs, for example, the headform HF shown in FIGS. Like the movement of the above, the elasticity of the pad material (not shown) alone cannot sufficiently receive the load, and a large input load P that is substantially directly applied to the headrest stay 10 may be applied (FIG. 3). At that time, if the input load P applied to the headrest stay 10 may be input to the left straight portion 11 as a large load component in the axial direction as the insertion direction, There is a possibility that a situation may occur in which the straight portion 11 is released from the locked state by the locking claw 32 in the headrest support 30 on the same side and pushed downward.

  Therefore, in order to prevent such a situation from occurring, the input load P is applied to the headrest stay 10 when the input load P from the rear is applied to the headrest stay 10 described above. A projecting member 20 is attached to project into a shape that can be received in advance. The overhang member 20 is coupled to each bent portion 12 of the headrest stay 10 described above, and transmits an input load P received from the rear to each bent portion 12 as shown in FIG. 11 is configured to act as a bending force that mainly pushes and tilts forward.

  Therefore, as shown in FIG. 4, the headrest stay 10 supports the headrest supports 30 that support the straight portions 11 when the headrest stay 10 receives the input load P from the rear as described above. The bending stress in the forward direction is concentratedly applied to the upper frame 2F, and the upper frame 2F of the seat back 2 supporting the headrest support 30 is torsionally deformed so that the whole is tilted forward and pushed. Yes. The headrest stay 10 is in a state where the input load P received from the rear via the projecting member 20 is easily converted as a bending force that is pushed forward more and more as the forward tilt movement proceeds, and the straight on each side The part 11 is maintained in a state in which the headrest support 30 on each side is appropriately prevented from falling down.

  As shown in FIG. 1, each headrest support 30 described above is inserted from above into a pair of left and right square cylindrical holders 2H fixed to the front portion of the upper frame 2F of the seat back 2 described above. It is provided as an attached state. In each of the headrest supports 30 described above, the straight portions 11 of the headrest stay 10 described above are respectively inserted into the center portions thereof from above so that the entire inserted portions are constrained over the entire area from the outer peripheral side. A round hole-shaped insertion hole 31 that can be enclosed as a through hole is formed in a shape penetrating in the height direction.

<< Specific Configuration of Overhang Member 20 >>
Next, a more specific configuration of the above-described overhang member 20 will be described in detail. That is, the overhang member 20 is formed of one circular steel pipe member that is bent into a shape that is substantially U-shaped in plan view. Specifically, the above-described overhang member 20 is formed of a circular steel pipe material having substantially the same diameter (outer diameter) as the circular steel pipe material constituting the headrest stay 10 described above. The above-described overhanging member 20 includes a pair of left and right leg pieces 21 that obliquely extend in the front-down direction constituting the U-shaped leg pieces 21 and the end portions of the leg pieces 21 that extend in the rearward upward direction. It is formed by being folded into a bilaterally symmetric shape having a bridging piece 22 connected in a straight shape in the left-right direction.

  More specifically, each of the pair of left and right leg pieces 21 described above is bent into a state in which a middle portion in the extending length direction thereof is bent upward in a side view, whereby the above-described headrest stay is described. Each of the ten bent portions 12 is formed with a binding portion 21A and a jumping portion 21B that jumps up so as to bend backward with respect to each binding portion 21A. Each of the leg pieces 21 has a connecting portion 21A on the tip side extending in the front and lower direction between the straight portions 12B of the bent portions 12 of the headrest stay 10 and the connecting portions 21A in the width direction. It is made into the state which was match | combined in the shape extended adjacently and parallel, and these match | combined area | regions were widely welded integrally in the length direction of each other, and were fixed.

  As shown in FIG. 2, the protruding member 20 is provided in such a manner that the jumping portions 21B of the left and right leg pieces 21 are bent upward and bent upward from the roots of the connecting portions 21A. It is supposed to be in a state. Accordingly, the protruding member 20 is configured such that each of the raised portions 21B described above protrudes above the bent portions 12 of the headrest stay 10 so that the bridging pieces 22 that connect the extended end portions thereof are the headrest stay. It is provided as an overhanging state in the upper region between the ten bent portions 12.

  Specifically, the above-described overhanging member 20 is rearward toward the above-described headrest 3 due to the occurrence of a frontal collision of the vehicle as shown in FIG. 3 in a state where the backrest angle of the seat back 2 is in the neutral position. When headform HF (φ165 mm sphere with simplified human head) moves from the headform HF, the headform HF is provided in contact with the headform HF preceding the bent portion 12 and the straight portion 11 of the headrest stay 10 described above. It is in a state. More specifically, the above-described projecting member 20 is configured so that the tangent TL of the contact point between the headform HF and the bridging piece 22 coming from the rear side is 45 degrees obliquely upward with respect to the horizontal line. It is designed to receive the load.

  With such a configuration, the overhang member 20 has the input load P received from the headform HF applied in the forward direction as well as the insertion direction of the straight portion 11 of the headrest stay 10 described above. It is supposed to be in a state that can be. Then, the overhang member 20 strongly transmits the input load P received at the bridging piece 22 to the straight portions 12B of the bent portions 12 of the headrest stay 10 to which the left and right connecting portions 21A are coupled, A bending load around the upper frame 2F serving as a support point is applied to the headrest stay 10. Specifically, the overhang member 20 includes the straight portion 12B of each bent portion 12 (the arc shape of each bent portion 12) at the position where the input load P is eccentric to the front side of each straight portion 11 of the headrest stay 10. The curved portion 12A bent in a curved shape is transmitted to a portion that is eccentric to the front side of the bending point 12Aa, which is the midpoint between the beginning and end of the radius.

  As a result, the headrest stay 10 described above is pushed and bent forward around the upper frame 2F by the input load P rather than the axial compressive force in which the left and right straight portions 11 are pushed in the insertion direction. As shown in FIG. 4, the right and left straight portions 11 are deformed or displaced so as to be pushed forward and tilted around the upper frame 2F as shown in FIG.

  The headrest stay 10 is deformed or displaced so as to be pushed forward and tilted as described above, so that the action of the input load P received from the headrest stay 10 is more likely to be loaded as a bending force that is pushed forward and tilted forward. Become. Therefore, even if the headrest stay 10 receives the input load P from the headform HF as described above, a strong axial compression force in the insertion direction is not applied to each straight portion 11. These straight portions 11 are not easily disengaged from the engaged state with the locking claw 32 of the left headrest support 30 that supports the straight portion 11 in a fixed position. Therefore, since there is little possibility that the fixed position of the headrest stay 10 is broken due to breakage due to the input load P, the input load P is appropriately received while absorbing energy with the plastic deformation of the support system of the headrest stay 10. be able to.

  The overhang member 20 described above has a configuration having an outer diameter that is approximately half or more than the outer diameter of the headrest stay 10 described above, so that the input load P received from the head foam HF described above undergoes large plastic deformation. It can be stably transmitted to the headrest stay 10 without being accompanied. The overhang member 20 is formed of a circular steel pipe material in which the bridging piece 22 that receives the input load P from the headform HP extends in the width direction, so that the backrest angle of the seat back 2 is changed from the neutral position to the front-rear direction. Even when the input load P is received in a state of being deviated to a certain extent, the arc form outer peripheral surface can contact the headform HP in substantially the same form as described above.

<Summary>
In summary, the sheet 1 of the present embodiment has the following configuration. That is, a vehicle seat (seat 1) including a headrest (headrest 3) mounted on an upper portion of a seatback (seatback 2), and an extending portion extending downward from the inside of the headrest (headrest 3) A headrest stay (headrest stay 10) including a (straight portion 11) and a bent portion (curved portion 12) extending forward from the extending portion (straight portion 11) inside the headrest (headrest 3), and a seat back A stay fixing portion (headrest support 30) provided at an upper portion of the (seat back 2) and in which an extension portion (straight portion 11) of the headrest stay (headrest stay 10) is inserted from above and fixed; The headrest stay 10) is coupled to the bent portion (bent portion 12) of the headrest stay 10). Has dressed the input load (input load P) the headrest stay from rear against (the headrest 3) overhanging member overhanging shape to be received prior to the (headrest stay 10) (projecting member 20), the. The overhang member (the overhang member 20) transmits an input load (input load P) received from the rear thereof to the bent portion (bend portion 12) as a bending force that pushes and extends the extended portion (straight portion 11) forward. Make it work.

  With such a configuration, the extension portion of the headrest stay (headrest stay 10) can be set even if there is a load input from the rear to the headrest (headrest 3) due to the setting of the overhang member (extension member 20). It is possible to make it difficult for axial compression force in the insertion direction to be applied to the (straight portion 11).

  Further, the headrest stay (headrest stay 10) has a shape in which a bent portion (bent portion 12) extends forward from the upper end of the extending portion (straight portion 11). Location where the overhang member (the overhang member 20) extends forward beyond the connection portion (connection portion 12Ab) connected to the extension portion (straight portion 11) in the bent portion (bend portion 12) Is bound to. With such a configuration, the rear load (input load P) input to the projecting member (projecting member 20) is extended with respect to the bent part (bent part 12). It is possible to easily act as a bending force that pushes and tilts the straight portion 11) further forward.

  Further, the bent portion (curved portion 12) is bent from the upper end of the extending portion (straight portion 11) to be bent forward and downward (curved portion 12A), and from the tip of the curved portion (curved portion 12A) is extended. And a straight line portion (straight line portion 12B) extending linearly downward. A linearly extending coupling part (coupling part 21A) in which the projecting member (extrusion member 20) is applied in a shape extending along the straight part (straight part 12B) of the bent part (bent part 12); And a jumping part (bounce part 21B) that bends backward from the rear end of the binding part (bonding part 21A) and projects to the upper region of the curved part (curved part 12A). By adopting such a configuration, the extension member (the extension member 20) is more appropriately coupled to the bending portion (the bending portion 12) of the headrest stay (headrest stay 10), and input from the rear side. It can be made the state overhanging to the field which is easy to receive load (input load P).

  Further, the headrest stay (headrest stay 10) is configured to have a pair of left and right extending portions (straight portion 11) and a bent portion (bent portion 12). The overhang member (the overhang member 20) is configured to be provided in a state where both ends are supported in a state of being integrally bridged between a pair of left and right bent portions (bend portion 12). With such a configuration, a load from the rear (input load P) input to the projecting member (projecting member 20) is converted into each bent portion (bent portion 12) of the headrest stay (headrest stay 10). It can be transmitted in a stable manner with good balance between left and right.

<< About other examples >>
As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, the “seat” of the present invention is applied to a sheet applied to a vehicle other than an automobile such as a railway, a seat used for various vehicles such as an aircraft and a ship, in addition to a sheet other than the second row of an automobile. Can also be widely applied. Further, the headrest has a so-called L-type configuration in which the headrest stay is bent in a front-down shape inside the headrest stay, and the headrest stay has a “>” character in front of the headrest stay. It may be formed in a shape that is bent into a shape, or may be formed in other shapes.

  Further, the headrest stay does not necessarily have a pair of left and right bar shapes, and may be constituted by a member having a plate shape or other shapes. Moreover, the stay fixing | fixed part which supports a headrest stay may consist of a structure supported in the state which can support a headrest stay so that position adjustment is possible in a height direction or the front-back direction, or can be tilted and stored in the front-back direction.

  Further, the extending portion of the headrest stay is not necessarily limited to a shape extending straight from the inside of the headrest, and may be formed in a shape other than a straight shape such as a middle portion being bent. Further, the bent portion of the headrest stay is formed in a shape that bends forward from the upper end of the extending portion, is formed in a shape that bends forward, and has such a shape in the extending portion. It may be assembled. Moreover, the said bending part may be formed in the form which protrudes ahead in the branching form from the middle part of the length direction where the extension part is extended.

  Further, the overhang member may be any member that is coupled to the bent portion of the headrest stay and projects an input load from the rear to the headrest in advance so as to be received in advance of the headrest stay. The exit position is not limited to a specific shape or position. Specifically, the overhang member is not limited to a tube material similar to the headrest stay, but may be a plate material or other shape material. In addition, as long as the overhanging member is capable of receiving an input load from the rear in front of the headrest stay as described above, the shape of the overhanging member does not necessarily have to protrude to the upper side of the headrest stay. The shape may be protruded downward.

  The action of the bending force that transmits the input load received from the rear by the overhanging member to the bent portion of the headrest stay and pushes the extended portion forward is mainly strengthened by increasing the amount of eccentricity of the connecting portion with respect to the bent portion. However, the direction of attachment to the bent portion may be strengthened by making the input load easy to act in the bending direction. In addition, the overhang member may be coupled to the bent portion of the headrest stay in a cantilever support state instead of the both end support state.

1 seat (vehicle seat)
2 Seat back 2F Upper frame 2H Holder 3 Headrest 10 Headrest stay 11 Straight part (extension part)
11A Locking groove 12 Bent part 12A Curved part 12Aa Bending point 12Ab Connection part 12B Straight line part 13 Bridge part 20 Overhang member 21 Leg piece 21A Joining part 21B Bounce part 22 Bridge part 30 Headrest support (stay fixing part)
31 Insertion hole 32 Locking claw 33 Knob HF Headform TL Tangent P Input load

Claims (5)

A vehicle seat with a headrest mounted on the upper part of the seat back,
A headrest stay provided with an extending part extending downward from the inside of the headrest and a bent part extending forwardly from the extending part inside the headrest;
A stay fixing portion provided at an upper portion of the seat back, and the extension portion of the headrest stay is inserted and fixed from above;
A projecting member that is coupled to the bent portion of the headrest stay and projects an input load from the rear to the headrest in a form that can be received in advance of the headrest stay;
A vehicle seat that acts as a bending force that transmits an input load that the overhanging member receives from behind to the bent portion and pushes the extended portion forward. The vehicle seat according to claim 1,
The headrest stay has a shape extending from the upper end of the extending portion by bending the bent portion forward,
The vehicle seat, wherein the overhang member is coupled to a portion extending forward beyond a connecting portion connected to the extending portion in the bent portion. The vehicle seat according to claim 2,
The bent portion has a curved portion extending from the upper end of the extending portion to be bent forward and a straight portion extending linearly from the tip of the curved portion to the front downward;
The projecting member extends in a straight line and is coupled to the bent portion so as to extend along the straight portion of the bent portion, and bends upward from the rear end of the joint portion and is above the curved portion. A vehicle seat configured to have a spring-up portion projecting into an area. The vehicle seat according to any one of claims 1 to 3,
The headrest stay is configured to have a pair of left and right extending portions and the bent portion,
A vehicle seat in which the projecting member is configured to be supported in a state where both ends are integrally bridged between the pair of left and right bent portions. A headrest mounted on the upper part of the seat back,
A headrest stay provided with an extending portion extending downward from the inside of the headrest and a bent portion extending bent forward from the extending portion inside the headrest;
A projecting member that is coupled to the bent portion of the headrest stay and projects an input load from the rear to the headrest so as to be received prior to the headrest stay;
A headrest that acts as a bending force that transmits an input load that the overhanging member receives from behind to the bent portion and pushes and tilts the extended portion forward.

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