HEADREST

Abstract

Headrest (1) which includes: a headrest strut (3) with one or more legs (3a) attached to an upper part of a backrest; a housing body (5) comprising a front housing part (10) and a rear housing part (20), wherein the housing body (5) is mounted on an upper part of the headrest strut (3); a headrest cushion (2) as padding material that covers the housing body (5); a mass body (7) for vibration suppression, which is arranged to be oscillating within the housing body (5); and an elastic body (30, 40) suitable for supporting the mass body (7) and arranged within the housing body (5), wherein: the elastic body (30, 40) comprises a front elastic body (30) and a rear elastic body (40), the front elastic body (30) comprises a front locking section (34) for attachment to a rear side of the front housing part (10) and a front extension piece (30a) extending from the front locking section (34) along the rear side, the rear elastic body (40) comprises a rear locking section (44) for attachment to a front face of the rear housing part (20) and a rear extension piece (40a) extending from the rear locking section (44) along the front face, and the front locking section (34) and the rear locking section (44) are arranged separately from each other in a vertical and / or horizontal direction with the mass body (7) in between.

Description

[0001] The present invention relates to a headrest. In particular, it relates to a headrest comprising a headrest support, a housing, and a headrest cushion. The headrest support includes legs that are attached to an upper part of a seat back. The housing is mounted on an upper part of the headrest support. The headrest cushion is a padding material that covers the housing.

[0002] JP 2017-7480A discloses a headrest equipped with a dynamic damper for vibration suppression. Specifically, a flat urethane plate is placed within both the front and rear plastic housings. During assembly, a mass is inserted between the front and rear urethane plates, forming a weight. Each housing section has a rib that projects beyond the other housing section. These ribs abut each other in a front-to-back direction, forming an annular rib. Each urethane plate is attached to the housing by being pressed between the aforementioned ribs along its outer circumferential edge. The mass is located within an internal space formed by the abutting of the respective ribs.

[0003] The entire circumferential edge of the above urethane plate is pressed between the ribs of the housing. This can restrict the movable area of ​​the mass, preventing sufficient vibration damping. Furthermore, when placing the individual urethane plates onto the housing, the urethane plate can be lifted against the housing if it comes into contact with the ribs. This can cause the urethane plates to interfere with each other during assembly of the individual housings, resulting in incorrect installation. Therefore, an objective of the present invention is to provide a headrest in which the housing parts can be assembled correctly while simultaneously ensuring a greater range of motion for the mass.

[0004] For a better understanding of the present invention, reference is also made to WO 2014 / 017 232 A1 and DE 10 2016 208 324 A1.

[0005] A headrest according to the present invention comprises a headrest support, a housing, and a headrest cushion. The headrest support has legs that are attached to an upper part of a backrest. The housing is mounted on an upper part of the headrest support. The headrest cushion is a padding material that covers the housing. A mass for vibration damping is arranged inside the housing. An elastic body is also arranged inside the housing. The elastic body elastically supports the mass against the housing. The housing has a front housing part and a rear housing part, which are separated from each other so that they are connected at the front and rear, respectively. The elastic body has a front elastic body and a rear elastic body.The front elastic body has a front locking section attached to a rear face of the front housing part and a front extension extending from the front locking section along the rear face. The rear elastic body has a rear locking section attached to a front face of the rear housing part and a rear extension extending from the rear locking section along the front face. The mass body is supported between the front extension and the rear extension, being held by the front and rear sides. The front locking section and the rear locking section are separated from each other in one direction and in the other, which is a vertical or horizontal direction, to hold the mass body.

[0006] Therefore, compared to a configuration where the entire circumference of the front elastic body and the entire circumference of the rear elastic body are locked, tensioning and lifting of the elastic body can be prevented. This reduces mutual interference between the front and rear elastic bodies during assembly of the front and rear housing sections, thereby reducing housing assembly errors. Furthermore, the range of motion of the mass body can be increased compared to the configuration where the entire circumference of the front or rear elastic body is locked. In this way, the housing can be assembled correctly while simultaneously ensuring a greater range of motion for the mass body.

[0007] The headrest of the present invention can further be configured as follows. The front housing part comprises a front rib projecting from a rear face of the front housing part and in linear contact with a front face of the front extension piece. The rear housing part comprises a rear rib projecting from a front face of the rear housing part and in linear contact with a rear face of the rear extension piece. This configuration allows the mass body to compress the elastic body more easily compared to a configuration in which the front housing part is in surface contact with the front extension piece or the rear housing part is in surface contact with the rear extension piece. In this way, the movable area of ​​the mass body can be extended.

[0008] The headrest of the present invention can further be configured as follows. The front locking section is arranged in an upper region of the front elastic body above the mass body. The rear locking section is arranged in a lower region of the rear elastic body below the mass body. The front housing part and the rear housing part can be joined by placing the rear housing part on a mounting surface and covering it with the front housing part. In this case, an operator can perform the assembly while looking into the front locking section from the upper end of the front housing part. This allows the operator to perform the assembly and simultaneously efficiently check whether the front elastic body has fallen out of the front housing part.

[0009] The headrest of the present invention can further be configured as follows. The front housing part comprises a front pin projecting from the rear. The front pin extends through a front locking hole, which forms the front locking section of the front elastic body, so that it projects rearward from the front elastic body. The rear housing part has a rear pin projecting from the front. The rear pin extends through a rear locking hole, which forms the rear locking section of the rear elastic body, so that it projects forward from the rear elastic body. This makes it possible to secure the front elastic body to the front pin, so that it cannot be easily pulled out, even if the front pin and the rear pin are not provided with a locking section attached to the elastic body, e.g., a hook.It is also possible to lock the rear elastic body to the rear pin so that it cannot be easily pulled out.

[0010] The headrest of the present invention can further be designed as follows. The mass body can have the form of a column whose axis is oriented in the left-right direction. This reduces the amplitude difference between the upper and lower ends of the mass body, making it easier to control the vibration of the mass body. Consequently, vibration suppression can be carried out more effectively with the mass body. Fig. Figure 1 is a perspective view of a headrest according to the first embodiment. Fig. Figure 2 is a perspective view of an internal structure of the headrest. Fig. Figure 3 is a perspective exploded view of Fig. 2. Fig. Figure 4 is a perspective exploded view of Fig. 3 in a rear view. Fig. Figure 5 is a perspective exploded view of a urethane sheet mounted to a housing. Fig. Figure 6 is a perspective exploded view of Fig. 5 in a rear view. Fig. Figure 7 is a perspective view showing that a mass body and a headrest strut are mounted to a rear housing. Fig. 8 is a front view of Fig. 2. Fig. Figure 9 is a cross-sectional view along a line IX-IX in Fig. 8. Fig. Figure 10 is a cross-sectional view along a line XX in Fig. 8. Fig. Figure 11 is a cross-sectional view along a line XI-XI in Fig. 8.

[0011] The following are embodiments for carrying out the present invention with reference to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 described. If a direction such as forward, backward, upward, downward, left, right, etc. is given in the following description, it refers to the direction indicated in the individual figures. <Erste Ausführungsform>

[0012] First, a headrest 1 according to a first embodiment of the present invention is described. As described in Fig. As shown in Figure 1, the headrest 1 is designed as a headrest component of an automobile seat (not shown). The headrest 1 is equipped with a dynamic damper D for vibration suppression. In particular, the headrest 1 has a headrest cushion 2 made of urethane foam. The headrest cushion 2 is covered with a headrest cover 4 made of fabric. A headrest strut 3 extends downwards from the headrest cushion 2. The headrest strut 3 has two legs 3a. The headrest strut 3 is integrally connected to a backrest by connecting the lower ends of each leg 3a to an upper end of the backrest (not shown). The headrest 1 has a headrest housing 5 that is embedded in the headrest cushion 2.

[0013] As it is in Fig. As shown in Figure 2, the headrest housing 5 is a box-shaped element made of resin. The headrest housing 5 is connected to the upper part of the headrest strut 3. The headrest 1 has a mass 7, which is housed or contained within the headrest housing 5. The mass 7 is covered by a urethane plate 6 within the headrest housing 5. The mass 7 serves as a weight in the dynamic damper D. The urethane plate 6 serves as an elastic element in the dynamic damper D. In particular, the mass 7 is arranged to be oscillating within the headrest housing 5. When the headrest 1 is subjected to an impact or vibration, the mass 7 oscillates. This allows the kinetic energy from the oscillation of the headrest 1 to be converted into kinetic energy from the oscillation of the mass 7. The urethane plate 6, which covers the mass body 7, then elastically accommodates the mass body 7 and absorbs the vibration.In this way, the urethane plate 6 and the mass body 7 can suppress the vibration of the headrest 1. The urethane plate 6 corresponds to the "elastic body" of the present invention. <Kopfstütze 1>

[0014] The individual configurations of headrest 1 are described below. As it is in Fig. As shown in Figure 3, the headrest strut 3 comprises the legs 3a and a connecting section 3b, which connects the upper ends of the legs 3a and extends in a left-right direction. In front view, the headrest strut 3 has an inverted U-shape. The legs 3a extend straight downwards from the left and right ends of the connecting section 3b, respectively, and are bent obliquely forwards in an up-down direction approximately in the middle. <Kopfstützengehäuse 5 / Vorderes Gehäuseteil 10>

[0015] As it is in the Fig. 3 and Fig. As shown in Figure 4, the headrest housing 5 comprises a front housing part 10 and a rear housing part 20, which can be subdivided into a front and a rear area. The front housing part 10 essentially has a rectangular general surface 11 oriented forward and rearward. A flange-like side part 12 extends rearward from the circumferential edge of the general surface 11. ... Fig. As shown in Figure 4, the front housing part 10 has two strut locking ribs 14 extending in a top-bottom direction on the upper rear side of the general surface 11. Each strut locking rib 14 has a concavely curved recess 14a. The connecting section 3b of the headrest strut 3 is fitted into each recess 14a from the rear. The side part 12 has concavely curved recesses 12a formed at two locations on both sides of the general surface 11. The individual legs 3a of the headrest strut 3 are fitted into each of the recesses 12a from the rear. The headrest housing 5 corresponds to the "housing" of the present invention.

[0016] As it is in Fig. As shown in Figure 4, the front housing part 10 has a front urethane support 13 in the center of the rear surface of the general area 11. The front urethane support 13 supports the front urethane plate 30 of the urethane plate 6. The front urethane support 13 has an upper rib 13a and a lower rib 13b. In a rear view, the upper rib 13a forms a U-shape open at the bottom. The lower rib 13b forms a U-shape open at the top in a rear view. The upper rib 13a has two upper lateral ribs 13a1 projecting from the inner surfaces of its left and right sections, respectively. The upper rib 13a also has a notch 13a2 cut into a concave shape at the lower ends of its left and right sections, respectively.

[0017] As it is in Fig. As shown in Figure 4, the lower rib 13b has two lower lateral ribs 13b1 projecting from the inner surfaces of its left and right sections, respectively. The lower rib 13b also has a notch 13b2 cut out in a concave shape at the upper ends of its left and right sections, respectively. The notches 13a2 of the upper rib 13a and the corresponding notches 13b2 of the lower rib 13b lie essentially next to each other in the top-bottom direction and together each form an essentially semicircular notch.

[0018] As it is in Fig. As shown in Figure 4, the front urethane support 13 has four front ribs 13c extending in the top-bottom direction. Each front rib 13c extends from the underside of the front urethane support 13 to its center in the top-bottom direction. Each front rib 13c is arranged at predetermined intervals in the left-right direction. Each front rib 13c has a concavely curved front receiving surface 13c1. As shown in Figure 4, the front rib 13c is formed by the front rib 13c. Fig. As shown in Figure 11, each anterior receiving surface 13c1 is configured such that it is located essentially in the center of the anterior urethane support 13 in the top-bottom direction. Each anterior rib 13c has an anterior extension 13c2 that projects significantly posteriorly beneath the anterior receiving surface 13c1.

[0019] As it is in Fig. As shown in Figure 4, the anterior urethane support 13 has two reinforcing ribs 13d extending in a left-right direction along its upper and lower sections, respectively. Specifically, one of the reinforcing ribs 13d connects the left and right parts of the upper rib 13a. The other reinforcing rib 13d connects the left and right parts of the lower rib 13b. The reinforcing ribs 13d each extend in a left-right direction across the individual anterior ribs 13c.

[0020] As it is in Fig. As shown in Figure 4, the front urethane support 13 has two front pins 13e that project rearward. The front pins 13e are oriented in a left-right direction. The front pins 13e are each located above the individual front ribs 13c. As shown in Fig. As shown in Figure 6, the front pins 13e are each inserted into a respective front locking hole 34 of the front urethane plate 30. This insertion allows the front urethane support 13 to hold the front urethane plate 30 in a fixed position.

[0021] As it is in Fig. As shown in Figure 4, the front housing part 10 comprises extension pieces 15 on the inner surface of the side part 12. The extension pieces 15 extend rearward from four points on the side part 12, e.g., from a top, a bottom, a left, and a right point, with the front urethane support 13 located between them. Each of the top and bottom extension pieces 15 has a locking or latching claw 15a. The locking claw 15a projects outward vertically from the rear end of the extension pieces 15. Each of the left and right extension pieces 15 has a locking claw 15a projecting outward in the left-right direction at its rear end. <Hinteres Gehäuseteil 20>

[0022] As it is in Fig. As shown in Figure 3, the rear housing part 20 essentially comprises a rectangular general surface 21 oriented forward and backward. A flange-like side part 22 extends forward from the circumferential edge of the general surface 21. The rear housing part 20 includes two strut-locking ribs 24 extending in the top-bottom direction along the upper front face of the general surface 21. Each strut-locking rib 24 has a concave recess 24a. A connecting section 3b of the headrest strut 3 is pressed onto each recess 24a from the front. The side part 22 has two concave recesses 22a on the left and right sides of the general surface 21, respectively. The legs 3a of the headrest strut 3 are each pressed into one of the recesses 22a from the front.

[0023] As it is in Fig. As shown in Figure 3, the rear housing part 20 includes a rear urethane support 23 in the center of the front surface of the general area 21 to support a rear urethane plate 40 of the urethane plate 6. The rear urethane support 23 has an upper rib 23a, which forms a downwardly open U-shape in the front view, and a lower rib 23b, which forms an upwardly open U-shape in the front view. The upper rib 23a has two upper lateral ribs 23a1 projecting from the inner surfaces of its left and right sections, respectively. The upper rib 23a further has notches 23a2 cut out in a concave curved shape at the lower ends of its left and right sections, respectively.

[0024] As it is in Fig. As shown in Figure 3, the lower rib 23b comprises two lower lateral ribs 23b1, which project from the inner surface of its left and right sections, respectively. The lower rib 23b also has notches 23b2 cut out in a concavely curved shape at the upper ends of its left and right sections, respectively. The notches 23a2 of the upper rib 23a and the corresponding notches 23b2 of the lower rib 23b lie essentially next to each other in the top-bottom direction and each together form an essentially semicircular notch.

[0025] As it is in Fig. As shown in Figure 3, the rear urethane support 23 has four rear ribs 23c extending in the top-bottom direction. Each rear rib 23c extends from the top of the rear urethane support 23 to its center in the top-bottom direction. The rear ribs 23c are arranged at predetermined intervals in the left-right direction. Each rear rib 23c has a concavely curved rear receiving surface 23c1. As shown in Figure 3, the rear urethane support 23 is formed by a rib 23c1. Fig. As shown in Figure 11, each posterior receiving surface 23c1 is configured such that it is located substantially in the center of the posterior urethane support 23 in the top-bottom direction. The anterior receiving surface 13c1 of the anterior urethane support 13 and the posterior receiving surface 23c1 of the posterior urethane support 23 overlap significantly in the top-bottom direction. Each posterior rib 23c has a posterior projection 23c2 that extends significantly forward above the posterior receiving surface 23c1.

[0026] As it is in Fig. As shown in Figure 3, the rear urethane support 23 comprises two reinforcing ribs 23d, each extending in the left-right direction along its upper and lower sections, respectively. Specifically, one of the reinforcing ribs 23d connects the left and right sections of the upper rib 23a. The other reinforcing rib 23d connects the left and right sections of the lower rib 23b. Each of the reinforcing ribs 23d extends across the rear rib 23c in the left-right direction.

[0027] As it is in Fig. As shown in Figure 3, the rear urethane support 23 has two rear pins 23e projecting forward. The reinforcing ribs 23d are oriented in the left-right direction. The rear pins 23e are each located below the individual rear ribs 23c. As shown in Fig. As shown in Figure 5, the rear pins 23e are each inserted into a rear locking hole 44 of the rear urethane plate 40. This insertion allows the rear urethane support 23 to hold the rear urethane plate 40 in a fixed position.

[0028] As it is in Fig. As shown in Figure 3, the rear housing part has 20 rectangular locating holes 25 that penetrate the inner surfaces of the side parts 22 at four points, e.g., top, bottom, left, and right, with the rear urethane support 23 in between. Each locating hole 25 overlaps a corresponding extension piece 15 of the front housing part 10 in the up-down or left-right direction. ... Fig. As shown in Figure 9, the locking claws 15a of the individual extension pieces 15 each snap into a corresponding locating hole 25. This connection allows the front housing part 10 and the rear housing part 20 to be assembled as a single unit. < Urethane plate 6>

[0029] As it is in the Fig. 3 and Fig. As shown in Figure 4, the urethane plate 6 comprises a front urethane plate 30 and a rear urethane plate 40. The front urethane plate 30 is a cross-shaped, planar element that projects convexly upwards, downwards, left, and rightwards from the center. The front urethane plate 30 has two front locking holes 34, which are oriented in the left-right direction in the form of round holes. The front urethane plate 30 further comprises a front extension 30a that extends downwards from the front locking holes 34. The front urethane plate 30 corresponds to a "front elastic body" within the meaning of the present invention. The front locking hole 34 corresponds to a "front locking section" within the meaning of the present invention.

[0030] As it is in Fig. As shown in Figure 4, the front urethane plate 30 has a laterally long section 31 that is longer than the left-right width of the mass body 7. An upper extension 32 and a lower extension 33 project from the top of this laterally long section 31. The front locking holes 34 described above each penetrate the upper extension 32 in the front-back direction.

[0031] As it is in Fig. As shown in Figure 6, the front urethane plate 30 is inserted into the front urethane support 13. The front pins 13e of the front urethane support 13 are each inserted from the front into one of the respective front locking holes 34. This allows the front urethane plate 30 to be cantilevered and engage with a rear surface of the front housing part 10. As shown in Fig. As shown in Figure 10, the front urethane plate 30 is properly attached to the rear surface of the front housing part 10. The ends of each front pin 13e extend through one of the front locking holes 34 and protrude from a rear surface of the front urethane plate 30.

[0032] As it is in Fig. As shown in Figure 6, by placing the front urethane plate 30 onto the front urethane support 13, the upper extension piece 32 is clamped between the upper lateral ribs 13a1 from the left and right. The lower extension piece 33 is clamped between the lower lateral ribs 13b1 from the left and right. The ends of the laterally long section 31, extending to the left and right respectively, are clamped between the upper lateral ribs 13a1 and the lower lateral ribs 13b1 from above and below.

[0033] As it is in Fig. As shown in Figure 3, the rear urethane plate 40 is a cross-shaped, planar element that projects convexly upwards, downwards, left, and right from the center. The rear urethane plate 40 has two rear locking holes 44, which are oriented in the left-right direction in the form of round holes. The rear urethane plate 40 further comprises a rear extension piece 40a that extends upwards from the rear locking holes 44. The rear urethane plate 40 corresponds to a "rear elastic body" within the meaning of the present invention. The rear locking hole 44 corresponds to a "rear locking section" of the present invention.

[0034] As it is in Fig. As shown in Figure 3, the rear urethane plate 40 has a laterally long section 41 that is longer than the left-right width of the mass body 7. An upper extension 42 and a lower extension 43 project from the top of the laterally long section 41. Each of the rear locking holes 44 described above penetrates the lower extension 43 in the front-to-back direction.

[0035] As it is in Fig. As shown in Figure 5, the rear urethane plate 40 is inserted into the rear urethane support 23. The rear pins 23e of the rear urethane support 23 are each inserted from the rear into one of the respective rear locking holes 44. This allows the rear urethane plate 40 to be cantilevered and engage with a rear surface of the rear housing part 20. As shown in Figure 5, the rear urethane plate 40 is inserted into the rear urethane support 23 from the rear. Fig. As shown in Figure 10, the rear urethane plate 40 is properly attached to the rear surface of the rear housing part 20. The ends of each rear pin 23e extend through the respective rear locking hole 44 and project from a front surface of the rear urethane plate 40.

[0036] As it is in Fig. As shown in Figure 5, by placing the rear urethane plate 40 onto the rear urethane support 23, the upper extension piece 42 is clamped between the upper lateral ribs 23a1 from the left and right. The lower extension piece 43 is clamped between the lower lateral ribs 23b1 from the left and right. The ends of the laterally long section 41, extending to the left and right respectively, are clamped between the upper lateral ribs 23a1 and the lower lateral ribs 23b1 from above and below. <Massekörper 7>

[0037] As it is in the Fig. 3 and Fig. As shown in Figure 8, the mass body 7 is a column-shaped element made of a metallic material such as stainless steel. The left and right ends of the mass body 7 are rounded, so that the corners at the left and right ends are chamfered. The mass body 7 is aligned or oriented with its axis in the left-right direction. This horizontal orientation of the mass body 7 reduces the difference in amplitude between the upper and lower ends when it oscillates. This facilitates the control and suppression of the oscillation of the mass body 7. <Zusammenbau des dynamischen Dämpfers D>

[0038] The following is a detailed description of the procedure for assembling the individual components of the dynamic damper D. As described in the Fig. As shown in Figures 3-4, the front housing part 10 and the rear housing part 20 of the headrest housing 5 are separated into a front and a rear part. First, the front urethane plate 30 is mounted to the front urethane support 13 from the rear, as shown in Figure 3-4. Fig. 6 is shown. In particular, the front pins 13e are each inserted from the front into the respective front locking holes 34. The front extension piece 30a is then pushed from the rear against the front receiving surface 13c1 (see Fig. 4) of the front ribs 13c pressed.

[0039] Next, the rear urethane plate 40 is mounted to the rear urethane support 23 from the front, as shown in Fig. 5 is shown. In particular, the rear pins 23e are each inserted from the rear into the respective rear locking holes 44. The rear extension piece 40a is then pushed from the front against the rear receiving surface 23c1 (see Fig. 3) pressed on the posterior ribs 23c.

[0040] Next, as it is in Fig. As shown in Figure 7, the headrest strut 3 is mounted to the rear housing part 20. In particular, the connecting section 3b of the headrest strut 3 is inserted from the front into the recesses 24a (see Figure 7). Fig. 3) the strut locking ribs 24 are pressed. Each leg 3a of the headrest strut 3 is inserted from the front into the recesses 24a (see Fig. 3) of the side part 24. The mass body 7 is then mounted to the rear housing part 20. In particular, the mass body 7, with its axis aligned in the left-right direction, is pressed from the front against the laterally long section 41 (rear extension piece 40a) of the rear urethane plate 40. This compresses the rear urethane plate 40 so that the mass body 7 can be attached to the rear receiving surfaces 23c1 of the individual rear rib 23c. When assembling the headrest strut 3 and the mass body 7 described above, the rear housing part 20 is preferably placed on the mounting surface with its front facing upwards. This prevents the headrest strut 3 and the mass body 7 from falling downwards due to gravity.

[0041] Next, the front housing part 10 and the rear housing part 20 are joined together, as shown in the Fig. 2 and Fig. Figure 8 shows that the side panels 12 of the front housing part 10 and the side panels 22 of the rear housing part 20 are butted together, as shown in Figure 8. Fig. Figure 9 shows this. As a result, the locking claws 15a of the individual extension pieces 15 of the front housing part 10 each engage in the respective locating hole 25 of the rear housing part 20. This connects the front housing part 10 and the rear housing part 20 in one piece.

[0042] As it is in Fig. As shown in Figure 11, when the front housing part 10 and the rear housing part 20 are joined, the recesses 14a of the individual strut locking ribs 14 come into contact with the connecting section 3b of the headrest strut 3 from the front. This clamps the connecting section 3b from the front and rear between the strut locking ribs 14 of the front housing part 10 and the strut locking ribs 24 of the rear housing part 20. Furthermore, the individual recesses 12a of the front housing part 10 come into contact with the legs 3a of the headrest strut 3 from the front. Each leg 3a is clamped between the respective recess 12a of the front housing part 10 and the respective recess 22a of the rear housing part 20 from the front and rear. In this way, the headrest strut 3 and the headrest housing 5 are connected to each other.

[0043] As it is in Fig. As shown in Figure 11, the laterally long section 31 (the front extension 30a) of the front urethane plate 30 is pressed against the mass body 7 from the front. The front urethane plate 30 is compressed so that the mass body 7 can be attached to the individual front receiving surfaces 13c1 of the front ribs 13c. During assembly of the front housing part 10 and the rear housing part 20, the front extension 30a of the front urethane plate 30 is compressed so that it is curved along the shape of the individual front receiving surface 13c1. The front extension 30a supports the mass body 7 over a wide area from the top to the bottom of the mass body 7 from the front. The rear extension 40a of the rear urethane plate 40 is also compressed so that it is curved along the shape of the individual rear receiving surfaces 23c1.The rear extension piece 40a supports the mass body 7 from the rear over a wide area from the top to the bottom of the mass body 7. The mass body 7 is thus clamped between the front extension piece 30a and the rear extension piece 40a from the front and rear.

[0044] As it is in Fig. As shown in Figure 8, the left and right ends of the mass body 7 have a gap in the left-right direction between the inner surfaces of the left and right sections of the front urethane support 13. As shown in the Fig. 6 and Fig. As shown in Figure 8, the left and right ends of the laterally long section 31 of the front urethane plate 30 come into contact with the inner surfaces of the left and right sections of the front urethane support 13, respectively. Therefore, when the front urethane plate 30 is pressed against the mass body 7, the left and right ends of the laterally long section 31 penetrate the gap between the inner surfaces of the left and right sections of the front urethane support 13 and the mass body 7, so that the mass body 7 is covered from the outside in the left-right direction. The same applies to the rear urethane plate 40, where the left and right ends of the mass body 7 have a gap in the left-right direction between the inner surfaces of the left and right sections of the rear urethane support 23, respectively. As shown in Figure 8, the front urethane plate 30 is pressed against the mass body 7. Fig. 5 and Fig. As shown in Figure 8, the left and right ends of the laterally long section 41 of the rear urethane plate 40 come into surface contact with the inner surfaces of the left and right sections of the rear urethane support 23, respectively. Therefore, when the mass body 7 is pressed against the rear urethane plate 40, the left and right ends of the laterally long section 41 penetrate the gap between the inner surfaces of the left and right sections of the rear urethane support 23 and the mass body 7, so that the mass body 7 is covered from the outside in the left-right direction.

[0045] As it is in the Fig. 8 and Fig. As shown in Figure 10, the front locking holes 34 of the front urethane plate 30 are located in the area above the mass body 7. The rear locking holes 44 of the rear urethane plate 40 are located in the area below the mass body 7. In other words, the front locking holes 34 and the rear locking holes 44 are separated vertically from each other above and below the mass body 7, respectively, with the mass body 7 positioned between them. This allows the range of motion of the mass body 7 to be extended compared to a configuration in which both the entire circumference of the front urethane plate 30 and the entire circumference of the rear urethane plate 40 are locked. It is also possible to suppress the tensioning and lifting of the front urethane plate 30 and the rear urethane plate 40.This prevents the front urethane plate 30 and the rear urethane plate 40 from interfering with each other during the assembly of the front housing part 10 and the rear housing part 20.

[0046] For example, the assembly of the front housing part 10 and the rear housing part 20 can be carried out by placing the rear housing part 20 on a mounting surface and placing the front housing part 10 on top of it. In this case, the front locking holes 34 are formed in an area above the mass body 7, so that an operator can see into the front locking holes 34 from the top of the front housing part 10 during assembly. This configuration makes it possible to perform assembly work between the front housing part 10 and the rear housing part 20 and to efficiently check whether the front urethane plate 30 has fallen out of the front housing part 10. <Bewegung des Massekörpers 7>

[0047] As described above, the mass body 7 is elastically supported, with its perimeter covered by the front urethane plate 30 and the rear urethane plate 40. In the configuration described above, the mass body 7 oscillates while compressing the front urethane plate 30 and the rear urethane plate 40. When the mass body 7 oscillates significantly forward and backward, it contacts the front receiving surfaces 13c1 and the rear receiving surfaces 23c1, thus restricting further movement (see Fig. 11) Therefore, the front receiving surface 13c1 and the rear receiving surface 23c1 prevent the mass body 7 from falling off the front urethane plate 30 and the rear urethane plate 40. If the mass body 7 oscillates significantly to the left and right, it contacts the left and right parts of the front urethane support 13 and the rear urethane support 23, respectively.

[0048] As it is in the Fig. 8 and Fig. As shown in Figure 11, the front receiving surfaces 13c1 of each front rib 13c come into linear contact with the front urethane plate 30. The rear receiving surfaces 23c1 of each rear rib 23c come into linear contact with the rear urethane plate 40. This allows the mass body 7 to compress the front urethane plate 30 and the rear urethane plate 40 more easily than in a configuration where the front housing part 10 is in surface contact with the front urethane plate 30 or the rear housing part 20 is in surface contact with the rear urethane plate 40. This allows the range of motion of the mass body 7 to be increased.

[0049] As it is in Fig.As shown in Figure 10, each front pin 13e has the shape of a protruding pin. Therefore, if the mass body 7 moves in a forward and upward direction not covered by the individual front receiving surfaces 13c1, it can be prevented from moving further by contact with each front pin 13e. Similarly, each rear pin 23e has the shape of a protruding pin. Thus, if the mass body 7 moves in a backward downward direction not covered by the individual rear receiving surfaces 23c1, it can be prevented from moving further by contact with each rear pin 23e.

[0050] In summary, the headrest according to the first embodiment has the following configurations. The reference numerals given in parentheses below are those corresponding to the respective configurations shown in the embodiments above.

[0051] As described above, a headrest support (3) has legs (3a) attached to an upper part of a backrest. A housing (5) is attached to an upper part of the headrest support (3). A headrest cushion (2) covers the housing (5). A mass (7) for vibration damping is located inside the housing (5). An elastic body (6) is located inside the housing (5). The elastic body (6) elastically supports the mass (7) against the housing (5). The housing (5) has a front housing part (10) and a rear housing part (20), which are separate from each other for connection at a rear and front, respectively. The elastic body (6) has a front extension (30a) and a rear elastic body (40).The front extension piece (30a) has a front locking section (34) attached to a rear side of the front housing part (10) and a front extension piece (30a) extending from the front locking section (34) along the rear side. The rear elastic body (40) has a rear locking section (44) attached to a front side of the rear housing part (20) and a rear extension piece (40a) extending from the rear locking section (44) along the front side. The mass body (7) is supported between the front extension piece (30a) and the rear extension piece (40a), clamped from the front and rear. The front locking section (34) and the rear locking section (44) are separated from each other in the vertical and horizontal directions, respectively, with the mass body (7) clamped between them.

[0052] Therefore, compared to a configuration where both the entire circumference of the front elastic body (30) and the entire circumference of the rear elastic body (40) are locked, tensioning and lifting of the elastic body (6) can be suppressed. This reduces mutual interference between the front elastic body (30) and the rear elastic body (40) during the assembly of the front housing part (10) and the rear housing part (20), thereby reducing assembly errors of the housing (5). Furthermore, the range of motion of the mass body (7) can be increased compared to a configuration where either the entire circumference of the front elastic body (30) or the entire circumference of the rear elastic body (40) is locked. In this way, the housing (5) can be assembled correctly while allowing a greater range of motion for the mass body (7).

[0053] The headrest of the present invention can further be configured as follows. The front housing part (10) can include a front rib (13c) projecting from a rear side and in linear contact with the front of the front extension piece (30a). The rear housing part (20) can include a rear rib (23c) projecting from a front side and in linear contact with the rear extension piece (40a). This allows the mass body (7) to easily compress the elastic body (6) compared to a configuration in which the front housing part (10) is in surface contact with the front extension piece (30a) and the rear housing part (20) is in surface contact with the rear extension piece (40a). This allows the range of motion of the mass body (7) to be increased.

[0054] The headrest of the present invention can further be configured as follows. The front locking section (34) can be arranged above the mass body (7) of the front elastic body (30). The rear locking section (44) can be arranged below the mass body (7) of the rear elastic body (40). The front housing part (10) and the rear housing part (20) can be assembled by placing the rear housing part (20) on a mounting surface and covering it with the front housing part (10). In this case, an operator can perform the assembly while looking into the front locking section (34) from the upper end of the front housing part (10). This allows the operator to perform the assembly and simultaneously efficiently check whether the front elastic body (30) has fallen out of the front housing part (10).

[0055] The headrest of the present invention can further be configured as follows. The front housing part (10) comprises a front pin (13e) projecting from the rear. The front pin (13e) extends through the front locking hole (34), which forms the front locking section (34) of the front elastic body (30), and projects rearward from the front elastic body (30). The rear housing part (20) has a rear pin (23e) projecting from the front. The rear pin (23e) extends through the rear locking hole (44), which forms the rear locking section (44) of the rear elastic body (40), and projects forward from the rear elastic body (40).This makes it possible to lock the front elastic body (30) to the front pin (13e), so that it cannot be easily pulled out even if the front pin (13e) and the rear pin (23e) do not include a locking section that engages with the elastic body (6), e.g., a hook. It is also possible to lock the rear elastic body (40) to the rear pin (23e), so that it cannot be easily pulled out.

[0056] The headrest of the present invention can further be designed as follows. The mass body (7) can have the form of a column whose axis is oriented in the left-right direction. This reduces the amplitude difference between the upper and lower ends of the mass body (7), making it easier to control the vibration of the mass body (7). Therefore, vibration suppression can be carried out more effectively with the mass body (7). <Weitere Ausführungsformen>

[0057] Although the present invention is described above with reference to one embodiment, the present invention can be implemented in various other forms in addition to the embodiments mentioned above.

[0058] The headrest can be used not only on automobile seats but also on seats of various vehicle types, such as non-autonomous vehicles including trains, airplanes, ships, etc. Alternatively, the headrest can also be used on seats other than car seats, for example, seats in public facilities such as cinemas and in homes. Furthermore, as long as the headrest is configured to provide elastic support for the head of a seated person, it can be used in a configuration other than those described above, such as a configuration in which a headrest cushion is provided only in the front part of the headrest housing.

[0059] The front and rear housing sections can be configured to be integrally joined by any method, such as fastening with screws or other fasteners, gluing, or welding, with the exception of the engagement of the locking claws. The front housing section can be designed without front ribs, and the rear housing section can be designed without rear ribs.

[0060] The elastic body can be made of molded urethane, sheet urethane, or another rubber-like material with damping properties. The elastic body can have any shape. The front elastic body can be divided into multiple sections to support the mass body from the front. The rear elastic body can also be divided into multiple sections to support the mass body from the rear. The front extension can extend from the front locking section in any direction, as long as it is aligned along the rear of the front housing section. For example, it can extend not only in one direction, such as up or down, but also in multiple directions, such as up-down or left-right. Similarly, the rear extension can extend from the rear locking section in any direction.

[0061] The front and rear locking sections can be attached to the housing by pins or hooks protruding from the elastic body, in addition to the locking holes. Alternatively, the front and rear locking sections can be adhesive sections, which can be attached to the housing with adhesive materials such as hook-and-loop fasteners. The front and rear locking sections can be arranged separately on one side and on the other in the width direction, with the mass body positioned between them. Alternatively, the front and rear locking sections can be arranged diagonally separated, with the mass body positioned between them.The front locking section can be designed to lock the lower portion of the front elastic body below the mass body, and the rear locking section can be designed to lock the upper portion of the rear elastic body above the mass body. The front locking hole need not necessarily be designed to penetrate the front elastic body, and the rear locking hole need not necessarily be designed to penetrate the rear elastic body.

[0062] A single front pin and a rear pin may be provided, or three or more pins may be provided. The front and rear pins need not necessarily protrude through the elastic body. The front and rear pins may have hooks, flanges, or other locking sections at their protruding ends to prevent them from being pulled out against the elastic body.

[0063] The mass body can be columnar, prismatic, cubic, spherical, or any other shape. A columnar mass body can be oriented with its axis in a top-bottom direction. Reference symbol list 1 headrest 2 headrest cushions 3 Headrest strut 3a thigh 3b Connection section 4 headrest covers 5 headrest housings 6 Urethane plate, elastic body 7 mass bodies 10 Front housing part 11 General Area 12 Side panel 12a Recess 13 Anterior urethane support 13a Upper rib 13a1 Upper lateral rib 13a2 notch 13b Lower rib 13b1 Lower lateral rib 13b2 notch 13c Anterior rib 13c1 Front recording surface 13c2 Front extension piece 13d Reinforcing rib 13e Front pin 14 Strut locking rib 14a Recess 15 extension pieces 15a Locking or locking claw 20 Rear housing part 21 General Area 22 Side panel 22a Recess 23 Rear urethane support 23a Upper rib 23a1 Upper lateral rib 23a2 notch 23b Lower rib 23b1 Lower lateral rib 23b2 notch 23c Posterior rib 23c1 Rear recording surface 23c2 Rear Lead 23d Reinforcing rib 23e Rear pin 24 Strut locking rib 24a Recess 25 Passhole 30 Anterior urethane plate, anterior elastic body 30a Front extension piece 31 Long Section 32 Upper extension piece 33 Lower extension piece 34 Front locking hole, front locking section 40 Posterior urethane plate, posterior elastic body 40a Rear extension piece 41 Long section 42 Upper extension piece 43 Lower extension piece 44 Rear locking hole, rear locking section D damper

Claims

[1] Headrest (1) which includes: a headrest strut (3) with one or more legs (3a) attached to an upper part of a backrest; a housing body (5) comprising a front housing part (10) and a rear housing part (20), wherein the housing body (5) is mounted on an upper part of the headrest strut (3); a headrest cushion (2) as padding material that covers the housing body (5); a mass body (7) for vibration suppression, which is arranged to be oscillating within the housing body (5); and an elastic body (30, 40) suitable for supporting the mass body (7) and arranged within the housing body (5), wherein: the elastic body (30, 40) comprises a front elastic body (30) and a rear elastic body (40), the front elastic body (30) comprises a front locking section (34) for attachment to a rear side of the front housing part (10) and a front extension piece (30a) extending from the front locking section (34) along the rear side, the rear elastic body (40) comprises a rear locking section (44) for attachment to a front face of the rear housing part (20) and a rear extension piece (40a) extending from the rear locking section (44) along the front face, and the front locking section (34) and the rear locking section (44) are arranged separately from each other in a vertical and / or horizontal direction with the mass body (7) in between. [2] Headrest (1) according to claim 1, further comprising a front rib (13c) projecting from a rear of the front housing part (10) and in linear contact with a front of the front extension piece (30a), and a rear rib (23c) projecting from a front of the rear housing part (20) and in linear contact with a rear of the rear extension piece (40a). [3] Headrest (1) according to claim 1 or claim 2, wherein the front locking section (34) is arranged in an upper region of the front elastic body (30) above the mass body (7) and the rear locking section (44) is arranged in a lower region of the rear elastic body (40) below the mass body (7). [4] Headrest (1) according to any one of claims 1 to 3, wherein: the front housing part (10) further comprises a front pin (13e) which projects from a rear side, the front pin (13e) extends through a front locking hole as the front locking section (34) of the front elastic body (30), and the front pin (13e) projects backwards from the front elastic body (30). [5] Headrest (1) according to any one of claims 1 to 4, wherein: the rear housing part (20) includes a rear pin (23e) that projects from a front side, the rear pin (23e) extends through a rear locking hole as the rear locking section (44) of the rear elastic body (40), and the rear pin (23e) protrudes forward from the rear elastic body (40). [6] Headrest (1) according to one of claims 1 to 5, wherein the mass body (7) has the form of a column whose axis is oriented in a left-right direction. [7] Headrest (1) according to any one of claims 1 to 6, wherein the headrest strut (3) comprises a connecting section (3b) as an upper part, wherein the legs (3a) extend downwards from a left and a right end of the connecting section (3b). [8] Headrest (1) according to any one of claims 1 to 7, wherein: the rear housing part (20) comprises an upper rib (23a) and a lower rib (23b), and the upper rib (23a) and the lower rib (23b) each have a concave curved recess (24a) for receiving the mass body (7). [9] Headrest (1) according to claim 4, wherein: the front housing part (10) has an upper rib (13a) and a lower rib (13b), the upper rib (13a) has several vertical ribs projecting from an inner surface of the front housing part (10), and the front pin (13e) is located above or below the several vertical ribs. [10] Headrest (1) according to claim 4 or 9, wherein: the front housing part (10) comprises an upper rib (13a) and a lower rib (13b), the upper rib (13a) and the lower rib (13b) each comprise a lateral rib (13a1; 13b1) projecting from an inner surface of the front housing part (10), and the front pin (13e) is located above the lateral rib (13a1) of the upper rib (13a) or below the lateral rib (13b1) of the lower rib (13b).

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