JP4860298B2 - Headrest - Google Patents

Description

  The present invention relates to a headrest attached to an upper end portion of a backrest portion of a seat in a vehicle or the like.

  This type of headrest includes a metal stay having a pair of leg portions and a cushion pad provided at the upper end portion of the stay. And a pair of synthetic resin-made holding cylinders are provided at the upper end of the seat back part of the vehicle, and the headrest is mounted on the back part by inserting both legs of the stay into these holding cylinders. It has become. In such a headrest mounting structure, rattling is likely to occur during traveling of the vehicle due to a gap between the outer peripheral surface of both legs of the stay and the inner peripheral surface of the holding cylinder. However, there was a problem that the sense of luxury of use was lowered.

  In order to cope with such a problem, for example, a headrest mounting structure as disclosed in Patent Document 1 and Patent Document 2 has been proposed. That is, in the configuration described in Patent Literature 1, an arc-shaped support protrusion that can support the outer peripheral surface of the leg portion of the stay at at least three points is formed on the inner peripheral surface of the holding cylinder. Further, in the configuration described in Patent Document 2, the inner diameter of the holding cylinder is formed to be slightly larger than the outer diameter of the leg portion of the stay, and the opposing interval is formed on the inner peripheral surface of the holding cylinder. A plurality of protrusions are formed which are smaller than the outer diameter of the leg and can be pressed against the outer peripheral surface of the leg.

Furthermore, in addition to the configuration described in each of the above patent documents, for example, the following headrest mounting structure has been conventionally proposed. That is, in this conventional configuration, both leg portions of the stay are formed in a substantially C shape when viewed from the front so that the distance between the leg portions becomes wider toward the lower end side. And when attaching the headrest to the backrest part of the seat, the outer peripheral surfaces of both leg parts of each holding cylinder are inserted by inserting both leg parts into the holding cylinder on the backrest part while narrowing the gap between the lower ends of both leg parts. The rattling is suppressed by being pressed against the inner circumferential surface in the left-right direction.
JP 2001-161485 A Japanese Patent Laid-Open No. 2001-275783

  However, these conventional configurations have the following problems. In other words, in the configurations described in Patent Document 1 and Patent Document 2, a part of the holding cylinder comes into contact with the outer peripheral surface of the leg portion in a locally narrow area at the protrusion. For this reason, the protrusion is likely to be worn early due to contact with the outer peripheral surface of the leg portion of the stay, and when worn, the occurrence of rattling during the running of the vehicle cannot be suppressed. Further, since it is necessary to form an arc-shaped cylindrical protrusion on the inner peripheral surface of the holding cylinder, a complicated mold is required as a molding die, which increases the manufacturing cost.

  Further, in the conventional configuration in which both legs of the stay are formed in a substantially C shape, when the legs are inserted and assembled into the holding cylinder, the lower ends of both legs are strongly pressed inward to narrow the distance between the lower ends. Since it was necessary, the assembly was troublesome and time-consuming. In addition, since both the leg portions are pressed against the left and right positions of the inner peripheral surface of the holding cylinder, the play in the front-rear direction cannot be eliminated. For this reason, a sense of luxury for use has not been secured. That is, the seated person on the seat often feels the back-and-forth backlash more uncomfortable than the back-and-forth backlash because the head hits the headrest from the front.

  Further, it is also conceivable that the outer diameter of the leg portion of the stay is formed to be substantially the same as or slightly larger than the inner diameter of the holding cylinder, and the leg portion of the stay is tightly fitted in the holding cylinder. . However, in such a configuration, when adjusting the height position of the headrest by raising and lowering the leg portion of the stay with respect to the holding cylinder, a strong operating force is required, and the height adjustment work is not performed. It becomes difficult.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to provide a headrest that is simple in structure and excellent in durability, can be attached to the backrest portion of the seat without rattling, and can be easily adjusted in height. .

In order to achieve the above object, the present invention comprises a stay having a pair of leg portions and a cushion pad provided at the upper end portion of the stay, the both leg portions being provided at the upper end portion of the seat back portion. In the headrest that is inserted into the pair of holding cylinders and attached to the backrest part, the leg part is crushed by a part of the legrest so that a protrusion pressed against the inner peripheral surface of the holding cylinder is formed. The protrusions of the both leg portions are formed at left and right asymmetric positions .

  Therefore, in order to mount the headrest of the present invention on the backrest portion of the seat, when the both leg portions of the stay are inserted into the holding cylinders on the backrest portion, the protrusions formed on the leg portions are formed on the inner peripheral surface of the holding cylinder. Press contact. Therefore, the structure is simple and it is possible to suppress the occurrence of rattling between the outer peripheral surface of the both leg portions of the stay and the inner peripheral surface of each holding cylinder when the vehicle is traveling. Moreover, since the protrusion of the stay contacts the inner peripheral surface of the holding cylinder in a wide range corresponding to the adjustment stroke of the headrest up and down, wear of the holding cylinder can be reduced. Therefore, it is possible to suppress the occurrence of rattling as described above. In addition, unlike the conventional configuration in which the legs of the stay are formed in a substantially C shape, when the legs are inserted and assembled into the holding cylinder, the lower ends of the legs are strongly pressed inward, Since it is not necessary to narrow the interval, the assembling work can be easily performed.

  In the above configuration, the protrusion may be formed by crushing a part of the leg. With this configuration, when the stay is bent into a predetermined shape using a metal pipe or the like, the protrusions can be simultaneously crushed and formed on a part of both legs.

  Furthermore, in the above-described configuration, the protrusions of the both leg portions may be disposed at left and right asymmetric positions. With this configuration, when the headrest is adjusted and arranged at an arbitrary height position on the backrest portion, the protrusions on both leg portions are always pressed against the inner peripheral surface of each holding cylinder at different height positions. Therefore, it can avoid that the protrusion part of both leg parts is located on the one horizontal axis line extended in the left-right direction. For this reason, it is possible to prevent the headrest from rattling in the front-rear direction around the one horizontal axis.

  In addition, the protrusions of one leg are arranged at two upper and lower positions, the protrusions of the other leg are arranged at a height position between the two protrusions, and the cushion pad is within the vertical position adjustment range. Sometimes, it is preferable that at least two protrusions of the both leg portions are positioned in the holding cylinder. In this way, since the two protrusions having different height positions on the both leg portions are pressed against the inner peripheral surface of the holding cylinder within the use adjustment range of the cushion pad, it is possible to avoid a situation where the headrest rattles.

  In addition, when the cushion pad is in the vertical position adjustment range, if both protrusions of the one leg are positioned in the holding cylinder, three protrusions can be used within the cushion pad usage range. Since the portion is in pressure contact with the inner peripheral surface of the holding cylinder, it is possible to more effectively avoid the play.

  Further, in the above configuration, if the protrusion protrudes in the front-rear direction, the back-and-forth movement can be effectively suppressed, and if the protrusion protrudes in the left-right direction, the back-and-forth movement is effectively reduced. Can be suppressed.

  Moreover, if the protrusions protruding in the front-rear direction and the protrusions protruding in the left-right direction are combined, play in both the front-rear and left-right directions can be effectively suppressed.

  As described above, according to the present invention, the structure of the headrest is simple, and the headrest can be attached to the backrest portion of the seat without rattling, and a high-class feeling of use can be obtained. The excellent effect of becoming.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the headrest 11 of this embodiment includes a stay 12 having a pair of leg portions 12 a and 12 b and a cushion pad 13 provided at the upper end of the stay 12. . The stay 12 is formed by bending one metal pipe. The cushion pad 13 is formed by inserting the upper end of the stay 12 into the bag-shaped skin 14 and injecting a foamed resin material into the skin 14 and expanding the foamed foam in a state where they are set in the molding die. It is formed to have a predetermined shape.

  On the other hand, a pair of synthetic resin holding cylinders 17 are embedded and fixed to the upper end portion of the backrest portion 16 of the vehicle seat 15 with their upper end portions exposed. The headrest 11 is attached to the upper end portion of the backrest portion 16 by inserting both the leg portions 12 a and 12 b of the stay 12 into the holding cylinders 17 so as to be lifted and lowered. In this case, a locking mechanism (not shown) is provided at the upper end of one holding cylinder 17, and a plurality of notches 12c are formed in one leg portion 12a along the vertical direction, and a locking mechanism for any notch 12c. With the alternative lock, the headrest, that is, the cushion pad 13 is fixed at an arbitrary vertical adjustment position. Further, the lock mechanism is unlocked with respect to the notch 12c by operating the operation button 17a of the lock mechanism, and the vertical position of the headrest becomes adjustable, and the lock mechanism is released by releasing the operation of the operation button 17a. Due to the above-described locking action, the headrest is fixed at an arbitrary vertical adjustment position.

  As shown in FIGS. 1 to 4, a plurality of protrusions 19 are formed on both the leg portions 12 a and 12 b of the stay 12 so as to be in pressure contact with the inner peripheral surface of each holding cylinder 17. These protrusions 19 project in the front-rear direction of the outer peripheral surface by crushing part of both leg portions 12a, 12b from the left and right sides of the outer peripheral surface in the process of bending the stay 12 into a predetermined shape. It is formed to do. Moreover, these protrusions 19 are disposed at asymmetric positions in both leg portions 12a and 12b. That is, in one leg 12a, one protrusion 19 is disposed near the middle portion in the length direction, and in the other leg 12b, two protrusions 19 are disposed near the base end and the tip. ing. In other words, the protrusions 19 are disposed at two positions on the other leg 12b, and the protrusions 19 are disposed on the one leg 12a at a height position between the protrusions 19. . When the cushion pad 13 is within the vertical position adjustment range, the protrusion 19 of the one leg 12a and either or both of the protrusion 19 on the lower side or the upper side of the other leg 12b are It is positioned in the holding cylinder 17 and always press-contacts in the holding cylinder 17 at different height positions. Accordingly, the protrusions 19 of both the leg portions 12a and 12b are disposed at the left-right asymmetric position.

  In the headrest 11, as shown in FIGS. 1 and 2, a plurality of protrusions 19 are crushed and formed on the outer peripheral surfaces of both the leg portions 12 a and 12 b of the stay 12 at asymmetric positions. Therefore, when both the leg portions 12a and 12b of the stay 12 are inserted into the both holding cylinders 17, the protrusions 19 on the both leg portions 12a and 12b are pressed against the inner peripheral surface of each holding cylinder 17 at different height positions. Is done. Therefore, the headrest 11 is disposed at a required vertical position without causing backlash in the front-rear direction.

Therefore, the headrest of this embodiment exhibits the following effects.
(1) Unlike the conventional configuration in which the protrusions are formed on the holding cylinder 17 side, the protrusions 19 on both legs 12a and 12b formed by metal pipes move up and down the smooth inner peripheral surface of the holding cylinder 17 Since it moves within a wide range corresponding to the direction adjustment range, early wear of the holding cylinder 17 on the inner peripheral surface of the holding cylinder 17 can be prevented. Therefore, it is possible to suppress rattling between the outer peripheral surfaces of the both leg portions 12 a and 12 b of the stay 12 and the inner peripheral surfaces of the holding cylinders 17 during travel of the vehicle. In addition, since the protrusion 19 protrudes in the front-rear direction, rattling in the front-rear direction can be prevented, and therefore the headrest can be supported with the occupant seated on the vehicle seat 15 and the head supported by the headrest 11. When a force in the front-rear direction is applied to the seat 11, the seated person does not feel rattling and can enhance the sense of use. In addition, unlike the case where the diameters of both the leg portions 12a and 12b are the same as or larger than the inner diameter of the holding cylinder 17, a strong operating force is not required to adjust the headrest 11 up and down. It can be done easily.

  (2) Each protrusion 19 is formed so as to protrude in the front-rear direction of the outer peripheral surface by crushing a part of both leg portions 12a, 12b from the left and right sides of the outer peripheral surface. For this reason, when bending the stay 12 into a predetermined shape with a metal pipe, the protrusions 19 can be simultaneously crushed and formed on a part of both the leg portions 12a and 12b without adding a separate process. Can be easily performed.

  (3) Unlike the conventional configuration in which both legs of the stay are formed in a substantially C shape, when the legs 12a and 12b are inserted and assembled into the holding cylinder 17, the lower ends of the legs 12a and 12b are turned inward. Since it is not necessary to correct and deform by applying strong pressure and narrowing the interval on the lower end side, the assembling work can be easily performed.

  (4) Since the protrusions 19 of the both leg portions 12a and 12b of the stay 12 are arranged in the left-right asymmetric position, no matter what height the headrest 11 is adjusted, the protrusions on the both leg portions 12a and 12b are always provided. The portion 19 is pressed against the inner peripheral surface of each holding cylinder 17 at different height positions. Therefore, it can avoid that the protrusion part of both the leg parts 12a and 12b is located on the one horizontal axis line extended in the left-right direction, and can prevent the headrest 11 from rattling in the front-back direction centering on the said one horizontal axis line.

  (5) When the cushion pad 13 is within the vertical position adjustment range, the protrusion 19 of the leg 12 a and the protrusion 19 on the lower side or the protrusion 19 on the upper side of the leg 12 b are positioned in the holding cylinder 17. Therefore, it is possible to avoid a situation in which the protrusions 19 of both the leg portions 12a and 12b are always pressed against the inner peripheral surface of the holding cylinder 17 and the headrest is rattled.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-The cushion pad 13 is configured such that both protrusions 19 of the leg 12b are positioned in the holding cylinder 17 when the cushion pad 13 is within the vertical position adjustment range. In this way, when the cushion pad 13 is within the vertical position adjustment range, the protrusions 19 of the pair of leg portions 12a and 12b are pressed against the three locations on the inner peripheral surface of the holding cylinder 17, so that the headrest 11 Can be more effectively avoided.

  As shown in FIG. 5, in one leg 12a, a part of the outer peripheral surface is crushed from the front-rear direction so that the protrusion 19 protrudes in the left and right direction of the outer peripheral surface, and the other leg In the portion 12b, a part of the outer peripheral surface is crushed from both the left and right sides to form the protrusion 19 so as to protrude in the front-rear direction of the outer peripheral surface. That is, the protrusion 19 protruding in the front-rear direction and the protrusion 19 protruding in the left-right direction are combined. When configured in this way, not only the front-rear direction of the headrest 11 but also the force acting in the left-right direction can be effectively received, and the occurrence of rattling can be more effectively suppressed.

Similarly, the projecting direction of the plurality of projecting portions 19 formed on one leg portion 12a, 12b is different between the front-rear direction and the left-right direction.
A configuration in which the positions and the number of protrusions 19 formed on the legs 12a and 12b of the stay 12 are arbitrarily changed. For example, the protrusions 19 are formed only at the lower ends of both the leg portions 12a and 12b, or the number of protrusions 19 formed on the both leg portions 12a and 12b is the same as shown in FIG.

The protrusions 19 are formed so that the protrusions 19 with respect to both leg portions 12a and 12b of the stay 12 protrude only in the left-right direction.
As shown in FIG. 7, the protrusion 19 is formed by curving a part of both the leg portions 12 a and 12 b of the stay 12.

The side sectional view showing the headrest of one embodiment in the state where it was attached to the backrest part of the seat. The disassembled perspective view which shows the state before attachment of the headrest of FIG. Sectional drawing in the 3-3 line of FIG. (A) is the partial front view which expands and shows a part of leg part of a stay. (B) is a partial side view of the same. The cross-sectional view which shows the headrest of another embodiment. The perspective view which shows a modification. The side view which shows another modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Headrest, 12 ... Stay, 12a, 12b ... Leg part, 13 ... Cushion pad, 15 ... Seat, 16 ... Backrest part, 17 ... Holding cylinder, 19 ... Projection part

Claims (6)

A stay having a pair of legs, and a cushion pad provided at the upper end of the stay; the both legs are inserted into a pair of holding cylinders provided at the upper end of the seat back; In the headrest that can be attached to
A headrest characterized in that a part of the leg is crushed to form a protrusion pressed against the inner peripheral surface of the holding cylinder, and the protrusions of the both legs are arranged in a laterally asymmetric position. . When the protrusions of one leg are arranged at two positions above and below, and the protrusion of the other leg is disposed at a height position between the two protrusions, and the cushion pad is within the vertical position adjustment range The headrest according to claim 1, wherein at least two protrusions of the both leg portions are configured to be positioned in the holding cylinder. 3. The headrest according to claim 2, wherein when the cushion pad is within the vertical position adjustment range, both protrusions of the one leg are positioned in the holding cylinder. 4. The headrest according to any one of claims 1 to 3, wherein the protrusion is protruded in the front-rear direction. The headrest according to any one of claims 1 to 3, wherein the protrusion is protruded in the left-right direction. The headrest according to any one of claims 1 to 3, wherein a protrusion projecting in the front-rear direction and a leg projecting in the left-right direction are combined.

Images