KR102091220B1 - Headrest Locking Device - Google Patents

Abstract

The present invention relates to a headrest locking apparatus and, more specifically, relates to a headrest locking apparatus which comprises: a cover; an up/down locking plate which is slidably accommodated in the cover in a direction to hang on or to be released from a stay rod; a locking cover which is connected to the cover to keep the position; and a forward/backward locking plate which is slidably accommodated in the cover in a direction to hang on or to be released from the locking cover. On the up/down locking plate or the forward/backward locking plate, a first tension rib is located to apply an elastic force to the up/down locking plate or the forward/backward locking plate in the direction different from the sliding direction. The up/down locking plate and the forward/backward locking plate are integrated with each other in a plate material shape. The above composition declines the number of parts and the work-hours for assembly, thereby reducing cost.

Description

Headrest Locking Device

The present invention relates to a headrest locking device, and more particularly, to a headrest locking device capable of adjusting the front-rear position and the vertical position of the headrest through a button pressing operation.

U.S. Patent No. 6302485 (Patent Document 1) shows that the headrest is folded when one button is pressed. U.S. Patent No. 6302485 (Patent Document 1) has a problem in that the height of the headrest cannot be adjusted using the button for folding the headrest.

U.S. Patent No. 6910740 (Patent Document 2) shows that when the button is pressed, the headrest is rotated so that the angle in the front and rear direction of the headrest is adjusted. United States Patent No. 6910740 (Patent Document 2) has a problem in that it is not possible to adjust the height of the headrest up and down using a button for adjusting the front and rear angle of the headrest.

U.S. Patent No. 721598 (Patent Document 3) shows that pressing the button adjusts the height of the headrest. U.S. Patent No. 7621598 (Patent Document 3) has a problem in that it is not possible to adjust the front and rear positions of the headrest through the vertical height adjustment buttons of the headrest.

U.S. Patent No. 4426548 (Patent Document 4) shows that the headrest adjusts the front-rear position when a button is pressed. U.S. Patent No. 4426548 (Patent Document 4) has a problem in that it is not possible to adjust the vertical height of the headrest through the front and rear adjustment buttons of the headrest.

US Patent Publication No. 2012-0080926 (Patent Document 5) shows a structure that can move the headrest up and down and back and forth using a single button. U.S. Publication No. 2012-0080926 (Patent Document 5) enables the front and rear movement of the headrest by deforming the leaf spring interlocked with the lock plate to release the locking. This US Patent Publication No. 2012-0080926 (Patent Document 5) has a problem in that the internal structure is complicated and the assembly is poor and the product price is also high.

U.S. Patent No. 7267407 (Patent Document 6) is disposed between the bottom cover and the bottom cover and the headrest having a shape corresponding to the bottom opening of the headrest and moves in a direction to lock the ratchet post and moves in the unlocking direction of the ratchet post It includes a ratchet assembly for adjusting the height of the rest, the ratchet assembly includes a bottom portion for operating the ratchet assembly, the bottom cover surrounds the bottom portion and has a bezel portion disposed outside the headrest, and the bottom portion is a headrest Located under the outer surface of the, the height adjustment device is disposed on the outside of the headrest.

On the other hand, Korean Patent Application No. 10-1231013 (Patent Document 7), which was previously filed by the applicant, includes a middle cover in which a hollow portion is formed inside the cover of the headrest, a lock pin penetrating the hollow portion, and a rear plate penetrating the hollow portion. A lock plate positioned to be movable in a direction is disposed, and a button for pressing the lock plate is provided on the headrest. In Korean Patent Registration No. 10-1231013 (Patent Document 7), an adjustment device for adjusting the height and the front-rear position of the headrest is disposed inside the headrest, surrounding the lock plate on the middle cover and disposed outside the headrest. Since the bezel part to be formed is not formed, it is different from U.S. Patent No. 7267407 (Patent Document 6).

However, the headrest of Korean Patent Publication No. 10-1231013 (Patent Document 7) is installed so that the front cover is movable in the front-rear direction with respect to the rear cover, causing a gap in the device, and using a link structure. There is a problem in that it is complicated, the assembly performance is poor, and the product price is high.

In addition, the teeth of Korean Patent Publication No. 10-1231013 (Patent Document 7) are integrally formed on the front cover, and the front cover and the teeth must be formed of the same material, thereby increasing the weight of the device and deteriorating the fastening force.

On the other hand, Korean Patent Application Publication No. 10-1383094 (Patent Document 8), previously filed by the applicant, relates to a headrest capable of moving in the front-rear direction and the vertical direction, and includes a middle cover disposed inside the cover and the middle cover. Inserted to lock the front and rear direction of the headrest, the locking cover to which the locking pin inserted into the teeth of the locking cover is installed, the vertical portion of the stay rod penetrates and the lock plate connected to the locking pin plate, to return the locking pin plate Includes return spring.

However, Korean Patent Publication No. 10-1383094 (Patent Document 8) had to be processed by insert injection so that the bracket is positioned at the portion where the vertical portion is not applied because the plastic plate is made of plastic, so the strength is insufficient. In addition, there were two lock pin parts, and the lock pin assembly to fix the lock pin and the lock pin had to be assembled separately from the lock pin, and the return spring had to be assembled separately to the lock pin plate. Therefore, Korean Patent Publication No. 10-1383094 (Patent Document 8) had a large number of parts and assembly, and there was a problem in that the cost was increased.

U.S. Patent No. 6302485 (October 16, 2001) U.S. Patent No. 6910740 (2005.06.28) U.S. Patent No. 7621598 (November 24, 2009) U.S. Patent No. 44265482 (1981.05.05) U.S. Patent Publication No. 2012-0080926 (2012.04.05) U.S. Patent No. 7267407 (2007.09.11) Korean Registered Patent Publication No. 10-1231013 (2013.02.01) Korean Registered Patent Publication No. 10-1383094 (2014.04.02)

The present invention is to solve the above-mentioned problems, and an object is to provide a headrest locking device having a reduced cost by reducing the number of parts and assembly.

It is also an object of the present invention to provide a durable headrest locking device.

Headrest locking device of the present invention for achieving the above object, the cover; An upper and lower locking plate accommodated in the cover so as to be slidable in a direction in which the stay rod and the jam or jam are released; A locking cover connected to the cover so that the position is maintained; A front and rear locking plate accommodated in the cover so as to be slidable in the direction in which the locking cover is caught or released from the locking cover; including, but, the upper and lower locking plates or the front and rear locking plates in the direction different from the sliding direction. A first tension rib for applying an elastic force to the front and rear locking plates is positioned, and the upper and lower locking plates and the front and rear locking plates are integrally formed to have a plate shape.

In addition, the headrest locking device of the present invention, the first tension rib is characterized in that the upper and lower locking plate or the plate shape formed integrally with the front and rear locking plate.

In addition, the headrest locking device of the present invention, the lock plate is characterized in that the lock plate is positioned with a second tension rib that applies an elastic force to the lock plate in a direction different from the sliding direction of the lock plate.

In addition, the headrest locking device of the present invention, the second tension rib is characterized in that the upper and lower locking plate or the plate shape integrally formed with the front and rear locking plate.

In addition, the headrest locking device of the present invention is characterized in that the front and rear locking plates are bent and connected to the upper and lower locking plates, and the ribs connected to the upper and lower locking plates and the front and rear locking plates are formed in the bent portion.

The headrest locking device of the present invention has the following effects.

Since the locking plate is formed by a single press process, molding is easy. In addition, since the locking plate is an integral type, the number of parts is significantly reduced compared to the prior art, and the assembly work of the headrest moving device is also reduced, thereby reducing the manufacturing cost.

In addition, according to the present invention, the locking plate has a good elasticity and has a longer life than the prior art.

1 is an exploded perspective view of a first embodiment of the present invention
Figure 2 is a perspective view of the front cover of the present invention as viewed from the rear
Figure 3 is a perspective view of the rear cover of the present invention as viewed from the front
Figure 4 is a perspective view of the lower cover of the present invention
5 is a perspective view of the middle cover of the first embodiment shown in FIG. 1 seen from the front side;
Figure 6 is a perspective view of the middle cover of the first embodiment shown in Figure 1 seen from the rear side
7 is a perspective view of the front middle cover of the first embodiment shown in FIG. 1 seen from the front side;
8 is a perspective view of the front middle cover of the first embodiment shown in FIG. 1 seen from the rear side;
9 is a perspective view of the rear middle cover of the first embodiment shown in FIG. 1 seen from the front side;
10 is a perspective view of a bushing portion of the present invention shown in FIG. 1
Figure 11 is a perspective view of the locking cover of the present invention shown in Figure 1
12 is a perspective view of a bearing cover installed with the ball bearing of the present invention shown in FIG.
13A is a perspective view and a partially enlarged plan view of the locking plate of the first embodiment shown in FIG. 1;
Figure 13b is a side view of the locking plate of the first embodiment shown in Figure 13a
Figure 14 is a perspective view of the headrest of the present invention as viewed from the front
15 is a front view of the front cover removed from FIG. 14;
FIG. 16 is a rear view of the rear cover removed in FIG. 14;
FIG. 17 is a front view of the front cover and the rear cover removed in FIG. 14;
Figure 18 is a side view of Figure 17
19 is a horizontal cross-sectional view showing the relationship between the front cover and the rear cover and the locking cover.
20 is a horizontal cross-sectional view showing the relationship between the locking cover applied to the present invention and the front and rear locking plates.
21 is a side view showing a state before and after movement (dotted line) of the headrest in the forward and backward direction;
Figure 22a is a horizontal cross-sectional view of a locking plate coupled to the middle cover of the first embodiment
Figure 22b is a front view of a state in which the locking plate is coupled to the middle cover of the first embodiment
23 is an exploded perspective view of a second embodiment of the present invention
24 is a perspective view seen from the front side of the middle cover of the second embodiment shown in FIG. 23;
25 is a perspective view of the middle cover of the second embodiment shown in FIG. 23 as viewed from a different direction from FIG. 24;
26 is a perspective view of the middle cover of the second embodiment seen from the rear side
27A is a perspective view and a partially enlarged plan view of the locking plate of the second embodiment;
27B is a side view of the locking plate of the second embodiment
28 is a perspective view of a floor cover of the second embodiment
29 is a plan view of a locking plate, a locking cover, and a bearing cover installed on the bottom cover of the second embodiment
30 is a perspective view of the middle cover and the locking plate and the bottom cover of the second embodiment
31 is a perspective view of FIG. 30 seen from another direction
32 is a rear view of the locking plate coupled to the middle cover of the second embodiment before and after sliding.
33 is a vertical cross-sectional view of a state in which the front cover and the rear cover are removed from the headrest of the second embodiment, and a partial enlarged view for showing the relationship between the upper and lower tension ribs and the middle cover
34 is a front view of a state in which the front cover and the rear cover are removed from the headrest of the second embodiment

Among the configurations of the present invention to be described below, the same configuration as the prior art will be referred to the above-mentioned conventional technology, and a separate detailed description will be omitted.

The terminology used herein is only for referring to specific embodiments, and is not intended to limit the present invention. The singular forms used herein include plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” embodies certain properties, regions, integers, steps, actions, elements and / or components, and other specific properties, regions, integers, steps, actions, elements, components and / or groups It does not exclude the existence or addition of.

When an element is said to be "connected" to or "contacted" with another component, it is understood that other components may be directly connected to, or in contact with, other components. It should be.

For reference, for the same configuration as the prior art among the configurations of the present invention to be described below, reference will be made to the above-mentioned prior art, and a separate detailed description will be omitted.

The headrest of the present invention includes a cover 100 including a front surface 111 and a rear surface 121; The upper and lower locking plates 500a and 500b accommodated in the cover 100 so as to be slidable in a direction in which the stay rod 700 is caught or jammed; A locking cover 300 connected to the cover 100 so that the position is maintained; The front and rear locking plates 400a and 400b accommodated in the cover 100 so as to be slidable in the direction in which the locking cover 300 is caught or jammed is released, but includes: the upper and lower locking plates 500a and 500b or the The front and rear locking plates 400a and 400b are provided with first tension ribs 517a and 517b that apply elastic force to the upper and lower locking plates 500a and 500b or the front and rear locking plates 400a and 400b in a direction different from the sliding direction. , The upper and lower locking plates (500a, 500b) and the front and rear locking plates (400a, 400b) are integrally formed, it is characterized in that the plate shape.

The first tension ribs (517a, 517b) is characterized in that the upper and lower locking plates (500a, 500b) or the front and rear locking plates (400a, 400b) integral with the plate shape.

The locking plate 450a is provided with the second tension ribs 511a and 511b in which the locking plate 450a applies elastic force to the locking plate 450a in a direction different from the sliding direction of the locking plate 450a. It is characterized by.
The second tension ribs (511a, 511b) is characterized in that the upper and lower locking plates (500a, 500b) or the front and rear locking plates (400a, 400b) integral with the plate shape.

delete

The locking plate 450a of the present invention is easily molded because the molding is completed by a single press process. In addition, since the locking plate 450a is an integral type, the number of parts is significantly reduced compared to the prior art, and the number of assembly steps of the headrest moving device is also reduced, thereby reducing the manufacturing cost of the present invention.

The front and rear locking plates 400a and 400b are connected to the upper and lower locking plates 500a and 500b, and the bent portions are connected to the upper and lower locking plates 500a and 500b and the front and rear locking plates 400a and 400b. Characterized in that the first rib 405a or the second rib 405b connected is formed. Therefore, the durability of the locking plate 450a is good.

The locking cover 300 is inserted into the hollow portion 203 and connected to the cover 100, and the teeth 301 are disposed along the front-rear direction.

The locking plate 450a is formed with a vertical accommodating hole 501 through which the vertical portion 710 of the stay rod 700 penetrates, and is slidably installed in the middle cover 200 ', 200' in the left and right directions. .

The headrest moving device of the present invention is disposed inside the cover 100, and the middle cover 200 ', 200' in which the hollow portion 203 is formed, and the locking plate 450a are slid in the left and right directions. Further comprising a button (not shown), the interval between the front 111 and the rear 121 is maintained constant.

========================= First Embodiment ===================== ====

Hereinafter, a first preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 22B.

-cover-

The cover 100 includes a front 111 and a rear 121.

In this embodiment, the cover 100 includes a front cover 110 and a rear cover 120 disposed at the rear of the front cover 110, and the front cover 110 is fixed to the rear cover 120, It is integrally formed.

Furthermore, the cover 100 further includes lower covers 130 disposed on both sides and lower parts.

-Front cover-

The front cover 110 includes a front surface 111, front side walls 116 formed on both sides of the rear surface of the front surface 111, and a front floor 117 formed below the rear surface of the front surface 111.

The coupling hooks 118 are formed on both upper sides of the rear surface of the front surface 111 and lower sides of the front floor 117 so as to protrude toward the rear.

The coupling guide protrusions 118b are formed inside the coupling hooks 118 formed on both lower sides of the front floor 117.

A lower cover locking jaw 118c is formed at a lower portion of the rear surface of the front surface 111 so as to be disposed on both sides of the coupling hook 118.

The middle of the front side walls 116 is recessed inward, so that the fitting groove 116a is formed.

The locking cover connecting portion 115 is formed slightly below the middle of the rear surface of the front surface 111.

A fitting rod 118a is formed in the upper middle of the rear surface of the front surface 111.

Ribs are formed on both sides of the fitting rod 118a.

The guide portion 113 is formed to protrude from the front side 111 to be connected to both front side walls 116.

The guide part 113 has an outer side and an open front side, and consists of an upper surface, a lower surface, and an inner surface.

The front and rear coupling rods 119 are formed on the rear surface of the front side 111 to which bolts for coupling the front cover 110 and the rear cover 120 are fastened so as to be disposed on both sides and the lower side of the locking cover connecting portion 115.

At this time, the middle of the front bottom 117 is convex toward the lower side, and the front and rear coupling rods 119 are disposed on the convex portion. The convex portion has coupling guide projections 118b on both sides.

On the outer circumferential surface of the front-rear coupling rod 119, front-rear ribs 119a are formed along the front-rear direction so that the front-rear coupling rods 119 can move smoothly while being fitted in the guide receiving portion 205 of the middle cover 200 '. .

-Rear cover-

The rear cover 120 includes a rear surface 121, rear rear side walls 126 formed on both front surfaces of the rear surface 121, and a rear floor 127 formed on the lower front surface of the rear surface 121.

A hook fastening hole 128 into which the coupling hook 118 is inserted is formed in the rear cover 120.

A guide hole 128b into which the coupling guide protrusion 118b is inserted is formed in the rear cover 120.

The guide hole 128b is formed inside the hook fastening hole 128.

A long hole receiving portion 100a surrounding the long hole 134 of the lower cover 130 is formed on the lower surface of the rear floor 127.

A fitting groove 126b communicating with the fitting groove 116b is formed in the rear side walls 126 along the front-rear direction.

A lower cover hook fastening hole 126a is formed at both rear side walls 126.

On the front side of the rear surface 121, a locking cover connection portion 125 is formed slightly below the middle.

In the upper middle of the front surface of the rear surface 121, a tubular fitting portion 128a into which the fitting rod 118a is inserted is formed.

The upper and front surfaces of the rear surface 121 protrude to surround the periphery of the fitting portion 128a, thereby forming a coupling auxiliary plate 128c composed of both side surfaces and a bottom surface.

The fitting portion 128a is connected to the rear surface 121, the coupling auxiliary plate 128c, and a rib formed with a cross.

A protrusion having a circular cross-sectional shape is formed in the front-rear direction so as to make a line contact with the horizontal portion 720 of the stay rod 700 described below under the coupling auxiliary plate 128c.

The front and rear coupling rods 129 fastened to the front and rear coupling rods 119 are formed to protrude on the front surface of the rear surface 121.

The front and rear coupling rods 129 are formed on both sides and the lower side of the locking cover connecting portion 125 to form a total of three.

At this time, the middle of the rear bottom 127 is formed convex toward the lower side, and the front and rear coupling rods 129 formed on the lower part are disposed on the convex portion. Guide holes 128b are disposed on both sides of the convex portion.

Ribs are also formed on the outer circumferential surface of the front-rear coupling rod 129 to minimize friction by making the headrest line-contact with the middle cover 200 'when moving back and forth.

The front and rear coupling rods 119 and the front and rear coupling rods 129 may serve as a guide when the middle cover 200 ′ is coupled to the cover 100.

The front portion of the rear surface 121 is formed to protrude the guide portion 123 into which the guide portion 113 is inserted so as to be disposed on both rear side walls 126. The tubular guide portion 123 is formed on the upper sides of the rear side walls 126.

In addition, a button through hole in which a button (not shown) is accommodated is formed in the lower portion of the front side walls 116 and the lower portion of the rear side walls 126.

The button (not shown) is disposed on the outside of the locking plate 450a, and transmits a pressing force to the locking plate 450a to slide the locking plate 450a in the left and right directions.

-Bottom cover-

The lower cover 130 includes both side walls 131 disposed outside the front side wall 116 and the rear side wall 126 and a bottom 137 connected to the bottom of the side wall 131.

A fastening hook 132 fastened to the lower cover hook fastening hole 126a is formed on the inner surface of the sidewall 131.

On the inner surface of the side wall 131, a protruding piece 133 that is fitted into the fitting grooves 116b and 126b is formed below the fastening hook 132.

The bottom 137 is formed with a fastening hook 138 that is fastened to the lower cover locking jaw 118c in front of the upper surface.

A long hole 134 through which the vertical portion 710 of the stay rod 700 penetrates is formed at the rear of the floor 137 in the front-rear direction.

A support jaw protruding to surround the rear of the long hole 134 is formed on the upper surface of the bottom 137 to support the vertical portion 710.

The side wall 131 is provided with the button (not shown). For detailed configuration of the button (not shown), refer to Patent Document 8.

-Middle cover-

The middle cover 200 ′ is disposed inside the cover 100 and disposed between the front surface 111 and the back surface 121, and a hollow portion 203 is formed.

The middle cover 200 'includes main body parts 210a and 210b and guide parts 123 formed on the main body parts 210a and 210b.

The middle cover 200 'of the present embodiment is composed of a front symmetric middle cover 200a and a rear middle cover 200b, which are substantially symmetrical, and assembled and integrated in the front-rear direction.

The character 'FRT', which stands for Front, is formed on the front surface 221 of the middle cover 200 'to easily recognize that it is a surface to be positioned in front.

-Main body-

The body parts 210a and 210b are also divided into a front body part 210a and a rear body part 210b.

The body portion 210a, 210b is formed with a hollow portion 203 in the center in the front-rear direction.

The guide protrusion 213 is formed in front of the front body portion 210a and behind the rear body portion 210b so as to be disposed in the hollow portion 203.

On both sides of the main body parts 210a and 210b, vertical part through holes 217 into which the vertical parts 710 are fitted are formed.

The body parts 210a and 210b are formed with bushing fastening holes 216 such that both sides of the front and rear surfaces are penetrated in the front-rear direction to communicate with the vertical part through-holes 217.

The front and rear guide holes 204 are formed to penetrate through the front-rear direction so as to be disposed between the hollow portion 203, the bushing fastening hole 216, and the vertical through-hole 217 on both sides and bottom surfaces of the main body parts 210a and 210b. That is, three front and rear guide holes 204 are formed per one body portion 210a, 210b.

Bosses are formed on the body parts 210a and 210b when the lower front and rear guide holes 204 are formed.

The boss is formed to protrude downward from the lower surfaces of the main body parts 210a and 210b.

On both sides of the boss, ribs connected to the lower surfaces of the main body parts 210a and 210b are formed.

When assembling the middle cover 200 'and the cover 100, the front and rear coupling rods 119 and the front and rear coupling rods 129 for fastening are inserted into the front and rear guide holes 204.

On the other hand, the front and rear fastening portions 218 are formed on the main body portions 210a and 210b so as to be disposed below the front and rear guide holes 204 on both sides.

The front-rear fastening portion 218 is disposed between the central axis of the front-rear guide hole 204 and the vertical portion through-hole 217.

The front and rear fastening portions 218 are formed with fastening grooves through which bolts can be fastened.

When the front body portion 210a and the rear body portion 210b are coupled to each other and the bolts are fastened to the front and rear fastening portions 218, the front body portion 210a and the rear body portion 210b are not separated from each other.

The upper and lower locking plate inserting grooves 503a are formed in the left and right directions between the lower surface of the main body parts 210a and 210b and the front and rear fastening parts 218 so as to be located at the bottom of the main body parts 210a and 210b.

The upper and lower locking plate inserting grooves 503a are opened at the right side of the right side and the front side so that the connecting portions of the pressing transmission portion 520 and the pressing transmission portion 520-body 510a of the upper and lower locking plates 500 are respectively disposed. .

The upper middle of the upper and lower locking plate insertion groove 503a communicates with the lower portion of the hollow portion 203.

Both sides of the upper and lower locking plate insertion groove 503a communicate with the bushing fitting hole 201 and the vertical side through hole 217 to be described later. Therefore, the bushing portion 840 and the vertical portion 710 are positioned on both sides of the upper and lower locking plate insertion grooves 503a. Due to this, it may be caught in the body 510a of the upper and lower locking plates 500a in the locking groove of the stay rod 700.

The upper and lower locking plate insertion grooves 503a are opened at the right side so that the pressing transmission part 520 to be described later can be located outside the middle cover 200 '.

-Front body part (210a)-

The front body portion 210a protrudes from the rear side, and a rear middle cover coupling portion 240 is inserted into the front middle cover coupling groove 260 to be described later of the rear body portion 210b.

The rear middle cover coupling part 240 includes both side parts and an upper side. The both sides and the upper side include a space in which the inside is surrounded by ribs and ribs of the grid.

A rear middle cover coupling rod 241 is disposed in the spaces on both sides of the rear middle cover coupling portion 240.

The rear middle cover coupling portion 240 forms a part of the hollow portion 203 and the upper middle of the upper and lower locking plate insertion grooves 503a.

Meanwhile, a locking plate 450a in which the front and rear tension ribs 511a of the upper and lower locking plates 500a are contacted is formed on the front body portion 210a.

The front and rear tension rib contact portions 250a are positioned between the hollow portion 203 and the boss in which the front and rear guide holes 204 are formed so as to be disposed under the front body portion 210a.

It is a rectangular parallelepiped of the front-rear tension rib contact portion 250a, and the horizontal and vertical sections are rectangular.

The front and rear tension ribs 511a are elastically deformed when pressed against the rear surface of the front and rear tension rib contact portions 250a, thereby preventing the front and rear play of the locking plate 450a.

On the other hand, when assembling the body portion (210a, 210b) and the locking plate (450a), the front and rear locking plate (400a) is in contact with the rear of the coupling portion.

In addition, the bearing cover 310 is disposed to protrude slightly more rearward than the rear middle cover coupling portion 240.

In addition, the bearing cover 310 is disposed on the right side of the guide protrusion 213.

In addition, the locking cover 300 is disposed to protrude to the rear side of the middle cover 200 'even if it moves as far as possible. To this end, a stopper 304 is formed to protrude on the rear surface of the locking cover 300. The details of the stopper 304 will be described later.

-Rear body part (210b)-

In the middle of the rear body portion 210b, a front middle cover coupling groove 260 communicating with the hollow portion 203 is formed.

The front middle cover coupling groove 260 communicates with the hollow portion 20 and the upper and lower locking plate insertion grooves 503a.

The coupling portion of the front body portion 210a is inserted into the front middle cover coupling groove 260.

A coupling pipe 261 is formed on the front surface of the rear body portion 210b to be disposed in the front middle cover coupling groove 260.

A coupling rod of the front body portion 210a is inserted into the coupling pipe 261.

On the outer circumferential surfaces of the coupling rod and the coupling pipe 261, front and rear ribs are formed along the front-rear direction so that they can move smoothly when they are joined to or separated from each other.

The front and rear locking plates 400a are disposed in the coupling groove.

The front and rear locking plates 400a disposed in the engaging groove have a front surface contacting the front body portion 210a and a rear surface contacting the rear body portion 210b. That is, the front and rear locking plates 400a are interposed between the front body 210a and the rear body 210b, so that play is prevented from moving back and forth.

In addition, the coupling pipe 261 is inserted into the coupling hole 403 to be described later of the front and rear locking plates 400a. Therefore, the coupling pipe 261 may serve as a guide when the front and rear locking plates 400a are disposed in the rear middle cover 200b.

Among the lower portions of the rear body portion 210b, there is an upper and lower tension rib contact surface 270a to which the upper and lower tension ribs 512a are contacted on the right side of the front middle cover coupling groove 260.

The upper and lower tension rib contact surfaces 270a are planes formed in the left and right directions.

The upper and lower tension rib contact surfaces 270a form a part of the upper and lower locking plate insertion grooves 503a.

When assembling the middle cover 200 'and the locking plate 450a, the upper and lower tension ribs 512a are disposed between the front and rear guide holes 204 and the lower surfaces of the rear main body portion 210b to the upper and lower tension rib contact surfaces 270a. Since the contact is elastically deformed, the vertical play of the locking plate 450a is prevented.

The free end of the upper and lower tension ribs 512a is inserted into the insertion groove 512b. Accordingly, it is prevented that the free end of the upper and lower tension ribs 512a is caught by the middle cover 200 'when the locking plate 450a is moved.

The left and right tension rib engaging portions 280a, which are accommodated by the left and right tension ribs 517a, which are the first tension ribs, are formed through the front and rear directions at the rear lower side of the rear body portion 210b.

The right and left tension rib engaging portions 280a include through holes, and both side surfaces and upper and lower surfaces forming the through holes.

The left and right tension ribs 517a are elastically deformed when the locking plate 450a is slid while the left and right tension ribs 517a are hung on one of the side surfaces, thereby applying elastic force to the middle cover 200 '.

-Guide section-

The guide part 123 is provided on both sides of the guide front surface 221 and the guide rear surface 222 and the guide front surface 221 and the guide rear surface 222, which are spaced apart from the rear of the guide front surface 221. Each guide portion side 223 is disposed.

Since the middle cover 200 'of the present embodiment is divided into a front middle cover 200a and a rear middle cover 200b, the guide portion 123 is also divided into a front guide portion 200a and a rear guide portion 200b.

The guide front surface 221 is included in the front middle cover 200a, and the guide rear surface 222 is included in the rear middle cover 200b.

The front guide portion 200a and the rear guide portion 200b are symmetrical to each other.

The guide portion side 223 is included in both the front middle cover 200a and the rear middle cover 200b.

The guide portion side surface 223 is formed in a circular arc shape or a semicircular shape corresponding to the vertical section 710 to form a bushing fitting hole 201 therein.

Grid ribs are formed on the front surface of the guide front surface 221 and the rear surface of the guide rear surface 222, respectively.

The guide front surface 221 and the guide rear surface 222 are spaced apart, and the space formed apart is in communication with the auxiliary core fitting hole 201.

An incision is formed on the lower side of the guide front surface 221 and the lower side of the guide rear surface 222 to communicate with the space.

On the upper side of the guide portion side 223, a front and rear guide portion 224 protruding to the left or right is formed.

The front and rear guide portion 224 has an open outside, and consists of an upper surface, a lower surface, and an inner surface, so that the shape of the vertical section is a 'c' shape.

In the front and rear guide portion 224, a guide portion 123 and a guide accommodation portion 205 in which the guide portion 113 is accommodated are formed in the front-rear direction.

The guide accommodating portion 205 is open at the front and rear sides or the front and rear sides and the right side depending on the formed position.

The left and right intervals of the guide guides 205 on both sides are formed wider than the left and right intervals of the front and rear guide holes 204, so that the headrest can be stably moved in the front-rear direction with respect to the middle cover 200 '.

-Locking plate (450a)-

In this description, the upper and lower locking plates 500a and the front and rear locking plates 400a are collectively referred to as locking plates 450a.

The upper and lower locking plate 500a is a body 510a which is inserted into the upper and lower locking plate insertion groove 503a of the middle cover 200 ', and a push transmission portion 520 formed by bending vertically from the right side of the body 510a. It includes.

The front and rear locking plates 400a are formed by bending vertically from the rear side of the upper and lower locking plates 500a.

The front and rear locking plates 400a are connected to the middle of the body 510a.

The left and right lengths of the front and rear locking plates 400a are approximately half the left and right lengths of the body 510a.

On the left and right sides of the body 510a, a vertical portion receiving hole 501 through which the vertical portion 710 of the stay rod 700 is inserted is formed to penetrate vertically.

The right side of the body 510a is formed with an inclined surface such that the front side connected to the push transmission part 520 is wider from left to right.

At this time, a guide hole 530a is formed in the vertical direction in the body 510a so that it is located in the front part of the wider portion of the right side, that is, the right vertical side receiving hole 501.

A fastening hook 650 is accommodated to the left of the guide hole 530a of the body 510a, and a protrusion is accommodated to the right of the guide hole 530a. Therefore, the protrusion also serves as a guide when the locking plate 450a is slid.

The guide hole 530a is disposed in front of the front and rear tension ribs 511a.

A tension rib integral with the body 510a is disposed between the locking plate 450a and the cover.

The tension rib includes front and rear tension ribs 511a, left and right tension ribs 517a, and upper and lower tension ribs 512a.

The tension rib of this embodiment is connected to the body 510a in the form of a cantilever.

In this description, one end of the tension rib is a free end and the other end is a fixed end.

The front and rear tension ribs 511a and the left and right tension ribs 517a disposed on the same plane with each other are disposed on the same plane as the body 510a.

Each of the front and rear tension ribs 511a, the upper and lower tension ribs 512a, and the left and right tension ribs 517a exert elastic force to the locking plate 450a in the rear, upward, or right direction.

The tension rib is disposed between the left and right vertical side receiving holes 501 formed in the body 510a.

The front and rear tension ribs 511a are positioned between the upper and lower locking plates 500a and the body portion 210a of the front middle cover 200a. Due to this, there may be no clearance between the upper and lower locking plates 500a and the middle covers 200a and 200b.

The left and right tension ribs 517a are positioned between the upper and lower locking plates 500a and the body portion 210b of the rear middle cover 200b. Due to this, the locking plate 450a may be returned to its original position after sliding.

The upper and lower tension ribs 512a are positioned between the upper and lower locking plates 500a and the body parts 210a and 210b of the middle cover 200 '. Due to this, the vertical play between the upper and lower locking plates 500a and the middle covers 200a and 200b may be eliminated.

-Up and down tension rib (512a)-

The upper and lower tension ribs 512a are formed in a long bar shape in the left and right directions.

The upper and lower tension ribs 512a exert elastic force on the middle cover 200 'in a direction not parallel to the sliding direction of the locking plate 450a.

The upper and lower tension ribs 512a are formed on the right side of the body 510a but are disposed above the body 510a.

In the upper and lower tension ribs 512a, the bent portion is disposed at the uppermost end. Accordingly, both ends of the upper and lower tension ribs 512a are spaced apart from the upper and lower tension rib contact surfaces 270a of the rear body portion 210b, which is the surface where the bent portion is in contact.

When the locking plate 450a is coupled to the middle cover 200 ″ and the bottom cover 600, the free end of the upper and lower tension ribs 512a is inserted into the insertion groove 512b. Therefore, it is prevented that the free end of the upper and lower tension ribs 512a is caught by the middle cover 200 ″ or the bottom cover 600 when the locking plate 450a is moved.

-Front and back tension rib (511a)-

The front and rear tension ribs 511a are disposed in the middle of the body 510a, but are disposed at the rear side of the body 510a. In more detail, the front and rear tension ribs 511a are disposed on the rear side of the guide hole 530a.

One side of the front and rear tension ribs 511a is in contact with the front and rear tension rib contact portions 250a, and the other side is connected to the body 510a of the upper and lower locking plates 500a.

The front and rear tension ribs 511a are characterized in that a plurality of bending pieces spaced from each other are formed between the one side and the other side.

The bend piece includes first bend pieces 534a and 534b and a second bend piece 536.

The front and rear tension ribs 511a are the first bending pieces 534a and 534b connected to the one side, and the second bending pieces disposed between the first bending pieces 534a and 534b and the body 510a. 536), the first bent piece (534a, 534b) and the second bent piece (536) formed between the straight piece (535).

The first bend piece (534a, 534b) and the second bend piece (536) is arc (Arc, 弧) shape, the first bend piece (534a, 534b) is inner than the second bend piece (536) It is characterized by being located in. Therefore, the second bend piece 536 is disposed to be surrounded by the first bend piece (534a, 534b).

One side 532 of the front and rear tension ribs 511a, which is in contact with the front and rear tension rib contact portions 250a, is located on the right side of the bending piece, and is located on the rear side of the front side of the body 510a.

Between one end and the other end of the front and rear tension ribs 511a, a bent portion 532 that is the one side 532 contacting the front and rear tension rib contact portions 250a is formed.

The bent portion 532 is located on the right side of the bent piece.

In addition, the bent portion 532 is located on the front side of the first bent piece (534a, 534b), the second bent piece (536). Furthermore, the bent portion 532 is disposed at the forefront of the front and rear tension ribs 511a. Accordingly, one end of the front and rear tension ribs 511a is spaced apart from the front and rear tension rib contact portions 250a to which the bent portion 532 contacts.

Hereinafter, the front and rear tension ribs 511a will be described in more detail.

The front and rear tension ribs 511a are connected to the other end of the first inclined piece 531 and the first inclined piece 531 that are inclined toward the front side from one end toward the bent part 532, and the convex part 532 convex toward the front side. , The second inclined piece 533 connected to the other end of the bent portion 532 and inclined rearward toward the other side, and the first inclined piece 534a, 534b connected to the other end of the second inclined piece 533, The straight piece 535 extending from the other end of the first bending piece 534a, 534b to the left, the second bending piece 536 connected to the other end of the straight piece 535, and the second bending piece It includes a narrow narrow piece 537 having a longer front-to-back length from the other end of 536 to the right.

One end of the first inclined piece 531 is one end of the front and rear tension ribs 511a, and the other end of the one-piece compromised light piece 537 is the other end of the front and rear tension ribs 511a.

One end of the first bending pieces 534a and 534b is disposed on the right side of the front side of the front side convex portion 513 to be described later.

The first bend pieces 534a and 534b are two bent pieces having different curvatures. In more detail, the first bend pieces 534a and 534b are connected to the other end of the first bend piece 534a connected to the other end of the second inclined piece 533 and the other end of the first bend piece 534a. It includes a 1-2 bend piece (534b).

The first-first bend piece 534a has a shape corresponding to the circular arc, and the arc is referred to as an arc of the first-first bend piece 534a. In addition to the first-first bent piece 534a, other bent pieces follow the same criteria when described on the basis of an arc.

Based on the center point of each arc, the first-first bend piece 534a is a spiral that is bent about 180 degrees from the other end of the second inclined piece 553 to the right rearward, and the 1-2nd bend piece 534b ) Is a spiral that is bent about 90 degrees from the other end of the 1st-1 bending piece 534a to the front of the left side.

The curvature of the 1-1nd bend piece 534a is smaller than the curvature of the 1-2nd bend piece 534b and the curvature of the second bend piece 536b.

The second bent piece 536 has an arc shape and is a curved spiral about 180 degrees.

It is preferable that the center point of the arc of the second bend piece 536 coincides with the center point of the arc of the first-first bend piece 534a. Due to this, the first-first bend piece 534a is spaced apart from the second bend piece 536 at the same distance, so that the first-first bend piece 534a and the second bend piece 536 contact each other. The elastic effect of the upper and lower locking plates 500a is good.

The left and right lengths of the straight piece 535 are slightly shorter than about half the radius of the arc of the first-first bent piece 534a. In other words, the left and right lengths of the straight piece 535 are similar to or equal to the separation distances of the 1-1nd bend piece and the 2nd bend piece 536.

The left and right lengths of the one-piece compromised light piece 537 are longer than the left and right lengths of the straight piece 535.

In the body 510a, through holes having a shape corresponding to the bending pieces 534a, 534b, and 536 of the front and rear tension ribs 511a are formed through in the vertical direction.

The through hole is a space formed by the front and rear tension ribs 511a and the body 510a spaced apart from each other. Since the left and right tension ribs 517a and the upper and lower tension ribs 512a are the same, the left and right tension ribs 517a and the upper and lower tension ribs 512a are omitted.

In addition, an insertion groove 511d into which the free end of the front and rear tension ribs 511a can be inserted is formed in the body 510a to communicate with the through hole.

The left and right spacing of the insertion groove 511d is about 3 times the left and right spacing of the front-rear tension rib contact portion 250a. When the locking plate 450a is not sliding, that is, when engaged with the stay rod 700, the front and rear tension rib contact portions 250a are disposed at the center of the insertion groove 511d. Therefore, even if the locking plate 450a is slid, the body 510a does not catch the front and rear tension rib contacts 250a.

The insertion groove 511d is a space formed by recessing the front surface of the body 510a to the rear side, and the front and upper and lower sides are opened.

In the front and rear tension ribs 511a, since the first inclined piece 531 having the free end is inserted into the insertion groove 511d and does not contact the middle cover 200 ', the locking plate 450a is damaged It is less likely to be and the life of the locking plate 450a is long.

The elastic effect of the front and rear tension ribs 511a is as follows.

First, the front and rear tension ribs 511a pressed against the middle cover 200 'exert an elastic force on the locking plate 450a in the rear direction, and the elastic force is the bent portion 532 and the first bent pieces 534a, 534b ) Is reduced to a certain amount and then transferred to the straight piece 535. At this time, since the elastic force is substantially orthogonal to the straight piece 535 side-by-side, the straight piece 535 can greatly reduce the elastic force than the first bending pieces 534a and 534b. At this time, if all of the elastic force is not reduced in the straight piece 535, the remaining elastic force is transferred to the second bending piece 536 and is reduced once more. Thereafter, if all of the elastic force is not reduced in the second bent piece 536, the remaining elastic force is transmitted to the body 510a and is all reduced. Therefore, the elastic force of the locking plate 450a serving as the plate spring of the present invention is good, and the life is longer than that of the prior art.

-Left and right tension ribs (517a)-

The left and right tension ribs 517a are disposed on the left side of the body 510a.

One of the left and right tension ribs 517a is connected to the body 510a.

In this embodiment, the left and right tension ribs 517a have one side in contact with the left and right tension rib engaging portions 280a, and the other side is connected to the locking plate 450a body 510a.

One side of the left and right tension ribs 517a protrudes to the rear side of the body 510a.

The left and right tension ribs 517a are in contact with the left and right tension rib locking portions 280a of at least one of the left or right sides of the free end, which is one side.

The left and right tension ribs 517a are formed with a plurality of bending pieces spaced apart from each other between the one side and the other side.

The bending pieces of the left and right tension ribs 517a include third bending pieces 554a and 554b and a fourth bending piece 556.

The third bend pieces 554a, 554b and the fourth bend piece 556 are arc-shaped, and the third bend pieces 554a, 554b are located inside the fourth bend piece 556. Therefore, the fourth bending piece 556 is disposed to be surrounded by the third bending pieces 554a and 554b.

The third bend pieces 554a and 554b have a shape similar or identical to the first bend pieces 534a and 534b. Accordingly, the third bend pieces 554a and 554b are composed of 3-1 bend pieces 554a and 3-2 bend pieces 554b.

The fourth bend piece 556 has a shape similar or identical to that of the second bend piece 536.

In more detail, the left and right tension ribs 517a include third bend pieces 554a, 554b, which are composed of 3-1 bend pieces 554a and 3-2 bend pieces 554b, and 3-1 bend pieces ( 554a) and a third bend piece 556 disposed between the 3-2 bend piece 554b, and a straight piece 555 formed between the 3-2 bend piece 554b and the fourth bend piece 556 ) And a hook 552 extending from the end of the 3-1 bending piece 554a to the front side.

Of the left and right tension ribs 517a, the portion of the left and right tension rib engaging portions 280a, that is, the left side of the hook 552 is located on the left side of the bending piece, and is located between the bending piece and the cover 100 It is characterized by being.

The hook 552 has a substantially rectangular parallelepiped shape, and is arranged side by side in the front-rear direction when it is pressed and is not elastically deformed.

In this embodiment, three convex portions 513 convex downward are formed on the body 510a.

The convex portion 513 is in contact with the lower side of the rear middle cover 200b. Therefore, since the body 510a is not in direct contact with the rear middle cover 200b, the possibility of damage when the locking plate 450a is slid is reduced.

One convex portion 513 is disposed at the rear of the body 510a and is disposed between the front and rear tension ribs 511a and the left and right tension ribs 517a, and the other convex portion 513 is the upper and lower tension ribs 512a. It is disposed at the rear of the upper and lower tension ribs (512a) and is disposed between the right vertical receiving hole (501), the remaining one convex portion (513) is disposed in the middle of the body (510a) and the front and rear tension ribs (511a) and up and down It is disposed between the tension ribs 512a.

A protrusion 514 is formed on the rear surface of the body 510a.

Two protrusions 514 are formed, one is disposed at the rear of the left vertical portion receiving hole 501, and the other one is disposed at the rear of the convex portion 513 disposed at the right rear.

The protruding portion 514 protrudes to the rear side from the front and rear locking plates 400a.

When the locking plate 450a is engaged with the middle cover 200 ', the protrusion 514 is in contact with the middle cover 200'. Therefore, it is prevented that the rear surface of the body 510a and the middle cover 200 'are in direct contact.

-Before and after locking plate (400a)-

The front and rear locking plates 400a include an upper surface, both side surfaces connected to the upper surface, and rear surfaces connected to both side surfaces and the body 510a.

The upper surface includes an inclined surface inclined downward as both sides go outward.

In the middle of the front-rear locking plate 400a, an insertion hole 401a through which the locking cover 300 and the bearing cover 310 can be inserted is formed through the front-rear direction.

The external shape of the insertion hole 401a is substantially similar to the hollow portion 203.

It is preferable that the left and right lengths of the insertion hole 401a are shorter than the left and right lengths of the hollow portion 203 so that the front and rear locking plates 400a can be inserted into the teeth 301.

In this embodiment, the left and right sides of the front and rear locking plates 400a are inserted into the teeth 301.

The front and rear locking plates 400a are formed with the above-described coupling holes 403 on both sides of the insertion hole 401a.

The locking plate 450a is disposed with a body 510a and a first rib 405a connected to the front and rear locking plates 400a so as to be disposed under the insertion hole 401a.

Three first ribs 405a are disposed, and two first ribs 405a on both sides are disposed behind the front and rear tension ribs 511a, and the other one of the first ribs 405a is left and right tension ribs. It is arranged at the rear of 517a.

-Bushing part-

The bushing fitting hole 201 and the vertical side through hole 217 of the middle cover 200 ′ are fitted with a bushing portion 840. Therefore, the bushing portion 840 is disposed between the middle cover 200 ′ and the vertical portion 710.

In the bushing portion 840, a stay rod through hole 845 through which the vertical portion 710 passes is formed in the vertical direction.

The bushing portion 840 is disposed at the lower portion of the upper portion 840a disposed inside the guide portion 123, the middle portion 840b disposed inside the body portions 210a, 210b, and the middle portion 840b. The lower portion 840c is disposed in the lower portions 210a and 210b and the upper and lower locking plate insertion grooves 503a.

Cut portions 841 are formed on both sides of the upper portion 840a.

The incision 841 disposed on the inner side communicates with the space between the guide front surface 221 and the guide rear surface 222.

Inside the bushing portion 840, a plurality of support protrusions 842 are formed in the vertical direction, so that the contact area with the vertical portion 710 is minimized, but the vertical portion 710 can be stably supported.

Furthermore, an elastic support piece 843 is formed by cutting the front and rear portions of the middle portion 840b.

The inner wall of the elastic support piece 843 is formed in a vertical cross-sectional shape in an arc shape.

In addition, a fastening hook 844 is formed in the middle portion 840b by cutting the front and rear ends to fit into the bushing fastening hole 216. Due to the fastening hook 844, the bushing portion 840 is installed in the middle cover 200 'with one touch.

The inner and outer walls of both the upper and lower parts of the middle portion 840b and the upper and lower parts of the rear part are formed so as to protrude a support protrusion having a curved shape.

The middle portion 840b may be divided into a first portion and a second portion, respectively, for the front side and the rear side so that they can be folded and filled laterally.

A hook is formed on the inner rear side of the first part, and an incision part into which the hook is inserted and an engaging piece for engaging the hook are formed on the inner front side of the second part.

A connection portion that is a center that is folded and unfolded by connecting the first portion and the second portion is formed at the outer rear side of the first portion and the outer front side of the second portion.

A portion of the lower portion of the lower portion 840c, which is a substantially circular band shape, may protrude downward from the middle cover 200 '.

In the lower portion 840c, withdrawal holes 847 are formed on both sides in the left-right direction.

The lower portion 840c is formed with a lower incision 846 in the vertical direction so as to communicate with the side of the extraction hole 847.

Due to the bushing portion 840, the middle cover 200 'with respect to the vertical portion 710 can be smoothly moved in the vertical direction and can reduce operating noise and friction.

-Locking cover-

The locking cover 300 is inserted into the hollow portion 203 and connected to the cover 100, and the teeth 301 are disposed along the front-rear direction on the left side.

In this way, the locking cover 300 is provided detachably from the cover 100.

The locking cover 300 is formed with a through hole 302 in which the locking cover connecting portions 115 and 125 are fitted at the center.

The upper and lower lengths of the teeth 301 are formed by the vertical lengths of the locking cover 300.

The teeth 301 of the locking cover 300 are formed to have a longer left-right width than a front-rear width.

The left and the upper and lower sides of the tooth 301 are open, and include front and rear surfaces and a right surface.

The front and rear surfaces of the teeth 301 are inclined in a direction away from each other toward the left, so that the front and rear locking plates 400a can be easily inserted. Therefore, the breakage of the headrest is reduced and the operation is smooth.

The rear surface of the tooth 301 is formed side by side in the front-rear direction.

The guide groove 303 into which the guide protrusion 213 is inserted is formed at the upper and lower portions of the locking cover 300.

The stopper 304 is disposed behind the locking cover 300.

The stopper 304 has a substantially rectangular parallelepiped shape.

The stopper 304 may be accommodated in the stopper catching groove 290a formed in the rear middle cover 200b having a shape corresponding to the outer shape of the stopper 304. Due to this, the locking cover 300 may not be moved over a certain distance with respect to the middle cover 200 '.

Reinforcing ribs 305 are formed on the inner wall of the left side where the teeth 301 are formed in the locking cover 300. The reinforcing rib 305 is disposed in the through hole 302.

A ball bearing 320 is installed in the hollow portion 203 of the middle cover 200 'to surround the upper and lower portions and the right portion of the locking cover 300.

The ball bearing 320 is disposed in the hollow portion 203 by the bearing cover 310.

The assembly guide part 390 is formed on the right side of the locking cover 300.

Assembly guide portion 390 is formed on the center and rear side of the right side of the locking cover 300, and includes an inclined surface inclined to the right from the front to the rear. Therefore, when the locking cover 300 is inserted into the bearing cover 310, the locking cover 300 and the bearing cover 310 are fitted to each other. Due to this, the locking cover 300 and the bearing cover 310 may be moved in the front-rear direction by the ball bearing 320 with respect to the middle cover 200 '. That is, when the headrest moves in the front-rear direction, the cover 100, the locking cover 300, and the bearing cover 310 move in the front-rear direction with respect to the middle cover 200 'and the locking plate 450a.

-Bearing cover-

On one side of the bearing cover 310, an incision 313 is formed in the front-rear direction.

The bearing cover 310 is formed with a locking cover through hole 312 in which the locking cover 300 is accommodated.

A bearing fitting hole into which the ball bearing 320 is fitted is formed on both sides of the upper and lower parts of the bearing cover 310. At this time, due to the ball bearing 320, the locking cover 300 can be smoothly moved in the front-rear direction with respect to the middle cover 200 '.

-----------------------------------

The assembly process of the headrest moving device of the first embodiment having such a configuration will be described.

The front and rear locking plates 400a insert the bearing cover 310 in which the locking cover 300 and the ball bearing 320 are assembled.

Thereafter, the combined parts are coupled to the rear middle cover 200b. At this time, the upper and lower locking plate 450a is inserted into the locking plate 450a insertion groove of the rear middle cover 200b, and the front and rear locking plates 400a are inserted into the engaging groove of the rear middle cover 200b, and the locking cover 300 ) And the bearing cover 310 are inserted into the hollow portion 203 of the rear middle cover 200b.

Thereafter, the combined parts are combined with the front middle cover 200a. At this time, the upper and lower locking plate 450a is inserted into the locking plate 450a insertion groove of the front middle cover 200a, and the locking cover 300 and the bearing cover 310 are hollow portions 203 of the front middle cover 200a. Is inserted in.

Thereafter, the bolt is fastened to the front-rear fastening portion 218 from the front side to the rear side.

Then, after assembling and inserting the bushing portion 840 into the stay rod 700, the stay rod 700 is inserted into the vertical through hole 217 of the middle cover 200 ′.

Thereafter, the combined parts are assembled with the rear cover 120.

Thereafter, the front cover 110 is assembled to the combined parts. At this time, the hook 118 is inserted into the hook fastening hole 128 so that the middle cover 200 ′ is disposed between the front cover 110 and the rear cover 120 to be pre-assembled.

Thereafter, the front cover 110 and the rear cover 120 are integrated by fastening the bolts from the front side to the rear side to the front and rear coupling rods 119 and 129 coupled to each other.

Thereafter, when the lower cover 130 is assembled to the front cover 110 and the rear cover 120 from the bottom to the top so that the fastening hook 138 is fastened to the hook fastening hole of the lower cover 130, the headrest is completed. .

Hereinafter, the operation of the headrest of the first embodiment having the above-described configuration will be described.

When the user wants to adjust the front-rear position or the up-down position of the headrest, the pressing force is transmitted to the push transmission unit 520 when the button is pressed, and the locking plate 450a moves to the left.

Due to this, the upper and lower locking plates 500a fitted in the locking grooves of the stay rod 700 are separated from the locking grooves, so that the middle cover 200 'and the cover 100 move in the vertical direction with respect to the stay rod 700. It becomes possible. That is, the headrest is movable in the vertical direction.

In addition, the front and rear locking plates 400a inserted in the teeth 301 are separated from the teeth 301. Therefore, the locking is released between the locking cover 300 and the front and rear locking plates 400a, so that the locking cover 300 and the cover 100 are movable in the front-rear direction with respect to the middle cover 200 '. That is, the headrest is movable in the front-rear direction.

In this way, the top and bottom locking and the front and rear locking of the headrest can be simultaneously released by pressing the button once, so that the position of the headrest can be adjusted according to the operation of the user moving the headrest back and forth or up and down. This improves user convenience.

On the other hand, when moving the headrest in the front-rear direction, as shown in Figure 21, the front cover 110 and the rear cover 120 is moved in the front-rear direction with respect to the stay rod 700 in an integrated state, the head The play and flow of the rest locking device can be minimized, and the structure of the device is simple, resulting in low assembly and manufacturing costs.

On the other hand, when the force of pressing the button is removed, as shown in (a) and (c) of FIG. 20, the locking plate 450a is moved to the right by the elastic force of the left and right tension ribs 517a to return to the original position. do. Due to this, the upper and lower locking plates 500a are again caught in the locking grooves, and the upper and lower positions of the headrest are locked, and as shown in FIG. 20 (b), the front and rear locking plates 400a are inserted into the teeth 301 again. The front and rear positions of the headrest are locked.

========================= 2nd Example ===================== ====

Hereinafter, a second preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4, 10 to 12, 14, 19, 21 and 23 to 34.

In the second embodiment, unlike the first embodiment, the middle cover 200 ″ is integrally formed, and the bottom cover 600 to be described below is assembled in the vertical direction in the middle cover 200 ″.

In addition, in the second embodiment, the upper and lower locking plates 500b are disposed between the middle cover 200 ″ and the bottom cover 600.

-Middle cover-

The middle cover 200 ″ is disposed between the front surface 111 and the back surface 121 of the cover 100, and a hollow portion 203 ′ is formed.

The middle cover 200 ″ includes a main body portion 210 and a guide portion 220 formed on an upper portion of the main body portion 210.

The body portion 210 is formed with a hollow portion 203 'in the center in the front-rear direction.

The lower half is open in the middle of the hollow portion 203 '. The front and rear locking plates 400b may be inserted upward from the lower side by the open lower side.

In the main body portion 210, guide protrusions 213 'are formed in front and rear so as to be disposed in the hollow portion 203'. The guide protrusion 213 'is formed in the front-rear direction.

On both sides of the body portion 210, vertical portion through holes 217 into which the vertical portions 710 are fitted are formed.

A bushing fastening hole 216 'is formed in the main body 210 to communicate with the vertical through-hole 217.

Fastening protrusion through hole 215 and fastening hook fitting hole 214 are formed on both sides of the front and rear bottom surfaces of the main body 210 so as to be disposed outside the fastening protrusion through hole 215.

The fastening hook fitting hole 214 is disposed at the front and rear sides of the vertical sub-penetration hole 217.

Front and rear guide holes 204 'are formed on both sides of the main body 210 so as to be disposed between the hollow portion 203' and the vertical portion through hole 217.

A front-rear coupling rod 119 and a front-rear coupling rod 129 are penetrated through the front-rear guide hole 204 '.

In addition, a bottom cover bolting fastening portion 218b is formed on the rear surface of the main body 210 so as to be disposed under the front and rear guide holes 204 '. A fastening groove through which a bolt can be fastened is formed in the bottom cover bolting part 218b.

On both sides of the lower surface of the body portion 210, ribs 219 are formed in the left and right directions before and / or after the vertical portion through holes 217 and / or on the sides.

The front and rear tension rib contact portions 250b are formed on both sides of the lower surface of the body portion 210 so as to be disposed on the rear side of the fastening protrusion through hole 215.

The front and rear tension rib contact portions 250b are rectangular in horizontal and vertical sections.

The left and right lengths of the front and rear tension rib contact portions 250b are the same as the left and right lengths of the fastening protrusion through hole 215.

Left and right tension rib contact portions 280b are formed on the lower surface of the main body portion 210 to be disposed between the front and rear tension rib contact portions 250b on both sides.

The left and right tension rib contact portions 280b are rectangular in horizontal and vertical sections.

The left and right tension rib contact portions 280b are disposed slightly to the left of the center of the main body portion 210 so as to be disposed under the guide protrusions 213 '.

The left and right tension rib contact portions 280b are disposed in front of the front and rear tension rib contact portions 250b.

A stopper catching groove 290b having a shape corresponding to the outer shape of the stopper 304 is formed on the rear side of the main body 210 so that the stopper 304 of the locking cover 300 is caught.

The stopper engaging groove 290b is in communication with the hollow portion 203 '.

In the rear middle of the main body 210, the front and rear locking plate insertion grooves 293 are formed in the left and right directions.

The front and rear locking plate insertion grooves 293 have a lower side communicating with the outer space, and an inner portion communicating with the hollow portion 203 '. Therefore, the teeth 301 of the locking cover 300 inserted into the hollow portion 203 'may be caught on the front and rear locking plates 400b, and thereby the front and rear movement of the headrest may be locked.

The guide part 220 includes a guide front surface 221 ', a guide rear surface 221' spaced apart from the rear of the guide front surface 221 ', a guide front surface 221', and a guide rear surface ( 221 '), the guide portion side surfaces 223' are disposed on both sides.

The guide portion side surface 223 'has a horizontal cross-sectional shape formed in a circular arc or semicircular shape corresponding to the vertical portion 710 to form a bushing fitting hole 201'. The bushing fitting hole 201 'is in communication with the vertical through-hole 217.

Grid ribs are formed on the front surface of the guide front surface 221 'and the rear surface of the guide rear surface 222', respectively.

The guide front surface 221 'and the guide rear surface 222' are spaced apart, and the space formed apart is in communication with the auxiliary core fitting hole 201 '.

An incision is formed on the lower side of the guide front surface 221 'and the lower side of the guide rear surface 222' to communicate with the space.

On the upper side of the guide portion side 223 ', a front and rear guide portion 224' protruding to the left or right is formed.

The front and rear guide portion 224 'has an open outside, and is composed of an upper surface, a lower surface, and an inner surface, so that the shape of the vertical section is a' c 'shape.

In the front and rear guide portion 224 ', a guide accommodation portion 205' in which the guide portion 113 and the guide tube 123 are accommodated is formed in the front-rear direction.

The guide accommodating portion 205 'is open at the front and rear sides or the front and rear sides and the right side depending on the formed position.

The distance between the guide accommodating portions 205 'on both sides is formed wider than the gap between the front and rear guide holes 204', so that the headrest can be stably moved in the front-rear direction with respect to the middle cover 200 ''.

-Floor cover-

The upper and lower locking plates 500b are disposed under the middle cover 200 ″, and the bottom cover 600 is combined with the lower portion of the middle cover 200 ″.

Between the bottom cover 600 and the middle cover 200 ″, an upper and lower locking plate 500b is installed to be slidably disposed.

The bottom cover 600 has a substantially plate shape.

A circumferential wall 630 is formed around the front and rear circumferences and the left circumference of the bottom cover 600.

The upper and lower locking plate insertion grooves 503b in which the body 510b of the upper and lower locking plates 500b are accommodated are formed inside the bottom cover 600 by the circumferential wall 630.

Stay rod through holes 610 through which the vertical portions 710 penetrate are formed on both sides of the bottom cover 600.

Fastening hooks 650 that are fitted to the fastening hook fitting holes 214 are formed on both front and rear sides of the bottom cover 600.

The hook portion of the fastening hook 650 is disposed above the body 510b of the locking plate 450b accommodated in the bottom cover 600. Therefore, when the locking plate 450b is accommodated in the bottom cover 600, the fastening hook 650 may serve to prevent the locking plate 450b from being detached.

Fastening protrusions 620 fitted to the fastening protrusion through-holes 215 are formed on both sides of the front and rear sides of the bottom cover 600.

Fastening hooks 650 are disposed closer to both ends of the bottom cover 600 than the fastening projections 620.

Through holes 640 are formed on both sides of the bottom cover 600.

The through hole 640 is disposed between the front fastening protrusion 620 and the rear fastening protrusion 620.

The bottom cover 600 is open to the right of the right side and the front side so that a portion of the push transmission part 520 ′ of the upper and lower locking plates 500b and the body 500 are widened.

The protrusion 690 is formed near the right front corner of the bottom cover 600.

The projection 690 is disposed on the right side of the fastening hook 650 disposed on the front right side.

When assembling the bottom cover 600 and the middle cover 200 ″, the top surface of the protrusion 690 is in contact with the bottom surface of the middle cover 200 ″. Therefore, it is disposed in the space between the open right and front sides of the bottom cover 600 and the middle cover 200 ″ to support the middle cover 200 ″.

A boss is formed on the bottom surface of the bottom cover 600 such that the front and rear guide holes 204 ″ are formed like the main body 210.

The boss is formed to protrude downward from the bottom surface of the bottom cover 600.

On both sides of the boss, ribs connected to the lower surface of the bottom cover 600 are formed.

When assembling the middle cover 200 ″ and the cover 100, a front-rear coupling rod 119 for fastening and a front-rear coupling rod 129 are passed through the front and rear guide holes 204 ′ of the bottom cover 600.

-Locking plate (450b)-

In this description, the upper and lower locking plates 500b and the front and rear locking plates 400b are collectively referred to as locking plates 450b.

The upper and lower locking plates 500b are a body 510b inserted into the upper and lower locking plate insertion grooves 503b of the bottom cover 600, and a push transmission portion 520 'formed by bending vertically from the right side of the body 510b. It includes.

The front and rear locking plates 400b are formed by bending vertically from the rear side of the upper and lower locking plates 500b.

The front and rear locking plates 400b are connected approximately in the middle of the body 510b.

The left and right lengths of the front and rear locking plates 400b are approximately 1/3 of the left and right lengths of the body 510b.

On the left and right sides of the body 510b, a through hole 501 ′ through which the vertical portion 710 of the stay rod 700 is inserted is formed to penetrate vertically.

On the right side of the body 510b, a guide hole 530b is formed in the vertical direction so as to be positioned in front of the right through hole 501 '.

The fastening hook 650 is accommodated to the left of the guide hole 530b of the body 510b, and the protrusion 690 is accommodated to the right of the guide hole 530b. Therefore, the projection 690 also serves as a guide when the locking plate 450b is sliding.

The guide hole 530b is disposed in front of the front and rear tension ribs 511b.

A tension rib integral with the body 510b is disposed between the locking plate 450b and the cover.

The tension rib is disposed between the left and right through holes 501 'formed in the body 510b.

The tension rib includes front and rear tension ribs 511b, left and right tension ribs 517b, and upper and lower tension ribs 512b.

The tension rib of this embodiment is connected to the body 510b of the locking plate 450b in the form of a cantilever.

In this description, one end of the tension rib is a free end and the other end is a fixed end.

The front and rear tension ribs 511b and the left and right tension ribs 517b disposed on the same plane with each other are disposed on the same plane as the body 510b.

Each of the front and rear tension ribs 511b, the upper and lower tension ribs 512b, and the left and right tension ribs 517b applies elastic force to the locking plate 450b in the rearward, upward, or rightward direction.

In this embodiment, the front and rear tension ribs 511b and the left and right tension ribs 517b are disposed approximately in the middle of the upper and lower locking plates 500b.

The front and rear tension ribs 511b, the upper and lower tension ribs 512b, and the left and right tension ribs 517b are approximately disposed in front of the front and rear locking plates 400b.

In this embodiment, there are two front and rear tension ribs 511b, and one left and right tension rib 517b is disposed between the two front and rear tension ribs 511b.

The upper and lower tension ribs 512b are disposed between the through holes 501 'of the upper and lower locking plates 500b and the front and rear tension ribs 511b.

The free end of the upper and lower tension ribs 512b is inserted into the insertion groove 512d formed by the body 510b penetrating up and down. Therefore, it is prevented that the free end of the upper and lower tension ribs 512b is caught by the middle cover 200 ″ when the locking plate 450b is moved.

The front and rear tension ribs 511b and the left and right tension ribs 517b are positioned between the front and rear locking plates 400b and the front side of the middle cover 200 ″.

The upper and lower tension ribs 512b are positioned between the body 510b and the body portion 210 of the middle cover 200 ″, and are in contact with the rear surface 210 ′ of the body portion 210. At this time, the back surface 210 'is a plane parallel to the left and right.

At this time, when the locking plate 450b is disposed between the bottom cover 600 and the main body 210, the upper and lower tension ribs 512b are elastically deformed by pressing in the vertical direction.

Due to this, the vertical play between the upper and lower locking plates 500b and the middle covers 200a and 200b may be eliminated, and at the same time, the upper and lower locking plates 500b by the front and rear tension ribs and left and right tension ribs 511b and 517b may be eliminated. The restoration function of can be implemented.

-Up and down tension rib (512b)-

The upper and lower tension ribs 512b are formed in a long bar shape in the left and right directions.

The upper and lower tension ribs 512b of this embodiment are disposed one by one between one front-rear tension rib 511b and one through-hole 501 ', and two are formed per one upper and lower locking plate 500b.

In the upper and lower tension ribs 512b, a bent portion is disposed at the top end. Therefore, both ends of the upper and lower tension ribs 512b are arranged to be spaced apart from the upper and lower tension rib contact surfaces 270b in contact with the bent portions.

When the locking plate 450b is coupled to the middle cover 200 ″ and the bottom cover 600, the free end of the front and rear tension ribs 511 b is inserted into the insertion groove 511 a. Therefore, the free end of the front and rear tension ribs 511b is prevented from being caught by the middle cover 200 ″ or the bottom cover 600 when the locking plate 450b is moved.

-Front and rear tension ribs (511b)-

In this embodiment, the front and rear tension ribs 511b disposed on the left side and the front and rear tension ribs 511b disposed on the right side are arranged to form a symmetrical relationship based on the center of the upper and lower locking plates 500b.

Hereinafter, the front and rear tension ribs 511b will be described based on the front and rear tension ribs 511b disposed on the right side.

One side of the front and rear tension ribs 511b is in contact with the middle cover 200 ″, and the other side is connected to the body 510b.

The front and rear tension ribs 511b are characterized in that a plurality of bending pieces spaced apart from each other is formed between the one side and the other side.

The bending pieces of the front and rear tension ribs 511b are disposed on the sides of the bending pieces of the left and right tension ribs 517b.

In more detail, one side 532 of the front and rear tension ribs 511b in contact with the front and rear tension rib contact portions 250b is located on the right side of the bending piece, and is located on the rear side of the front side of the body 510b. Is done. In the case of the front and rear tension ribs 511b, the one side 532 is located on the left side of the bending piece.

Between one end and the other end of the front and rear tension ribs 511b, a bent portion 532, which is one side 532 contacting the front and rear tension rib contact portions 250b, is formed.

The shape of the front and rear tension ribs 511b in the second embodiment is the same as the shape of the front and rear tension ribs 511b in the second embodiment, so a detailed description thereof will be omitted.

In the body 510b, through holes having a shape corresponding to the bending pieces 534a, 534b, and 536 of the front and rear tension ribs 511b are formed through in the vertical direction.

The through hole is a space formed by the front and rear tension ribs 511b and the body 510b spaced apart from each other. Since the left and right tension ribs 517b and the upper and lower tension ribs 512b are the same, the left and right tension ribs 517b and the upper and lower tension ribs 512b are omitted.

An insertion groove 511c into which the free end of the front and rear tension ribs 511b can be inserted is formed in the body 510b so as to communicate with the through hole.

When the locking plate 450b is slid to the left, the left and right lengths of the insertion groove 511c are left and right of the front and rear tension rib contact portions 250b so that the body 510b is caught by the front and rear tension rib contact portions 250b and cannot be slid It is preferably formed longer than the length.

The insertion groove 511c is a space formed by recessing the front surface of the body 510b, and the front is opened.

In the front and rear tension ribs 511b, the first inclined piece 531 having the free end is accommodated in the insertion groove 511c and does not contact the middle cover 200 ″, so that the locking plate 450b is It is less likely to be damaged and the locking plate 450b has a long life.

The elastic effect of the front and rear tension ribs 511b is as follows.

First, the front and rear tension ribs 511b pressed against the middle cover 200 '' exert an elastic force in the rear direction, and the elastic force decreases a certain amount through the bent portion 532 and the first bent pieces 534a and 534b. After being transferred to the straight piece 535. At this time, since the elastic force is substantially orthogonal to the straight piece 535 side-by-side, the straight piece 535 can greatly reduce the elastic force than the first bending pieces 534a and 534b. At this time, if all of the elastic force is not reduced in the straight piece 535, the remaining elastic force is transferred to the second bending piece 536 and is reduced once more. Thereafter, if all of the elastic force is not reduced in the second bent piece 536, the remaining elastic force is transmitted to the body 510b and is all reduced. Therefore, the locking plate 450b serving as the plate spring of the present invention has a good elasticity and has a longer life than the prior art.

-Left and right tension ribs (517b)-

The left and right tension ribs 517b are disposed in the middle of the body 510b so as to be disposed between the two front and rear tension ribs 511b.

At least one of the left and right sides of the free end side of the left and right tension ribs 517b is in contact with the middle cover 200 ″.

The left and right tension ribs 517b are formed with a plurality of bending pieces spaced apart from each other between the one side and the other side.

The bending pieces of the left and right tension ribs 517b include third bending pieces 554a and 554b and a fourth bending piece 556.

The third bend pieces 554a, 554b and the fourth bend piece 556 are arc-shaped, and the third bend pieces 554a, 554b are located inside the fourth bend piece 556. Therefore, the fourth bending piece 556 is disposed to be surrounded by the third bending pieces 554a and 554b.

The third bend pieces 554a and 554b have a shape similar or identical to the first bend pieces 534a and 534b. Accordingly, the third bend pieces 554a and 554b are composed of 3-1 bend pieces 554a and 3-2 bend pieces 554b.

The fourth bend piece 556 has a shape similar or identical to that of the second bend piece 536.

In more detail, the left and right tension ribs 517b include third bend pieces 554a, 554b, which are composed of 3-1 bend pieces 554a and 3-2 bend pieces 554b, and 3-1 bend pieces ( 554a) and a third bend piece 556 disposed between the 3-2 bend piece 554b, and a straight piece 555 formed between the 3-2 bend piece 554b and the fourth bend piece 556 ) And a hook 552 extending from the end of the 3-1 bending piece 554a to the front side.

The bent piece of the left and right tension ribs 517b is disposed between the bent piece of the left front and rear tension ribs 511b and the bent piece of the right front and rear tension ribs 511b.

Among the left and right tension ribs 517b, a portion of the middle cover 200 ″, that is, the left side of the hook 552 is located on the left side of the bend piece, and is positioned between the bend piece and the cover 100. It is characterized by.

When the hook 552 is pressed and is not elastically deformed, it is arranged side by side in the front-rear direction.

One end of the hook 552, that is, the free end protrudes toward the front side of the front surface of the body 510b, so that the front surface of the body 510b does not contact the middle cover 200 '' or the bottom cover 600. Does not.

Between the left and right tension ribs 517b and the body 510b, through holes having a shape corresponding to the hooks 552 and the third and fourth bending pieces 554a, 554b, and 556 are formed through in the vertical direction.

At this time, the portion between the right side of the hook 552 and the side surface of the body 510b facing the right side among the through holes of the left and right tension ribs 517b is wider as the horizontal cross-section goes from the front to the rear. It is shaped. In other words, the gap between the right side surface of the hook 522 and the body 510b is wider from side to side as it goes from front to rear. This is to prevent the hook 552 elastically deformed from the left and right tension rib engaging portions contacting the body 510b.

Meanwhile, three convex portions 513 'convex in the downward direction are formed on the body 510b.

The two convex portions 513 'are disposed at the rear of the body 510b so as to be disposed between the through hole 501' and the upper and lower tension ribs 512b.

The other one convex portion 513 'is disposed in front of the body 510b so as to be disposed between the left front and rear tension ribs 511b and the left and right tension ribs 517b.

33, the convex portion 513 'may be in contact with the bottom cover 600, thereby preventing the body 510b from directly contacting the bottom cover 600, thereby locking plate 450b. ) Or damage to the bottom cover 600 is prevented.

When the locking plate 450b is coupled to the middle cover 200 ″ and the bottom cover 600, the free ends of the front and rear tension ribs 511 b are inserted into the insertion groove 511 c. Therefore, the free end of the front and rear tension ribs 511b is prevented from being caught by the middle cover 200 ″ or the bottom cover 600 when the locking plate 450b is moved.

Both sides of the rear surface of the body 510b are formed to be recessed between the through hole 501 'and the front and rear locking plates 400b. At this time, the fastening protrusion 620 is disposed in the recessed portion. Therefore, when the locking plate 450b is slid from side to side, the fastening protrusion 620 may act as a stopper.

On the rear surface of the body 510b, a protrusion 514 'is formed outside the recessed portion.

The protruding portion 514 'protrudes to the rear side of the front and rear locking plates 400b.

When the locking plate 450b is coupled to the middle cover 200 ″ and the bottom cover 600, the protrusion 514 ′ contacts the circumference 630 of the bottom cover 600. Therefore, it is prevented that the rear surface of the body 510b and the bottom cover 600 are in direct contact.

-Before and after locking plate (400b)-

The front and rear locking plate 400b has a substantially quadrangular band shape, and includes an upper surface, both side surfaces connected to the upper surface, and rear surfaces connected to both side surfaces and the body 510b.

In the middle of the front-rear locking plate 400b, an insertion hole 401b is formed through which the locking cover 300 and the bearing cover 310 can be inserted through the front-rear direction.

The outer shape of the insertion hole 401b is approximately similar to the hollow portion 203 '.

It is preferable that the left and right lengths of the insertion hole 401b are shorter than the left and right lengths of the hollow portion 203 'so that the front and rear locking plates 400b can be inserted into the teeth 301.

In this embodiment, the left side of the front and rear locking plate 400b is inserted into the tooth 301.

The locking plate 450b is provided with a body 510b and a second rib 405b connected to the front and rear locking plates 400b so as to be disposed under the insertion hole 401b.

Three of the second ribs 405b are disposed, and two second ribs 405b on both sides are disposed behind the front and rear tension ribs 511b, and the other one of the second ribs 405b is left and right tension ribs. It is arranged at the rear of 517b.

-----------------------------------

The assembly process of the headrest moving device of the second embodiment having such a configuration will be described.

First, the front and rear locking plates 400b are inserted into the front and rear locking plate insertion grooves 293 of the middle cover 200 ″, and the upper and lower locking plates 500b are disposed under the middle cover 200 ″.

Thereafter, the middle cover 200 ″ and the bottom cover 600 are coupled so that the top and bottom locking plates 500b are inserted into the top and bottom locking plate insertion grooves 503b of the bottom cover 600.

Thereafter, a bolt is fastened to the bottom cover bolting fastening portion 218b of the middle cover 200 ″ and the fastening protrusion 215 disposed at the rear of the bottom cover 600.

Then, after assembling and inserting the bushing portion 840 into the stay rod 700, the stay rod 700 is inserted into the vertical through hole 217 of the middle cover 200 ″.

Thereafter, the bearing cover 310 into which the locking cover 300 and the ball bearing 320 are assembled is inserted.

Thereafter, the locking cover 300 and the bearing cover 310 are inserted into the hollow portion 203 ′ of the middle cover 200 ″ and the insertion hole 401 b of the front and rear locking plates 400 b.

Thereafter, the combined parts are assembled with the rear cover 120.

Thereafter, the front cover 110 is assembled to the combined parts.

At this time, the middle hook 200 ″ is disposed between the front cover 110 and the rear cover 120 to insert the hook 118 into the hook fastening hole 128 to temporarily assemble it.

Thereafter, the front cover 110 and the rear cover 120 are integrated by fastening the bolts from the front side to the rear side to the front and rear coupling rods 119 and 129 coupled to each other.

Thereafter, when the lower cover 130 is assembled to the front cover 110 and the rear cover 120 from the bottom to the top so that the fastening hook 138 is fastened to the hook fastening hole of the lower cover 130, the headrest is completed. .

Hereinafter, the operation of the headrest of the second embodiment having the above-described configuration will be described.

When the user wants to adjust the front-rear position or the vertical position of the headrest, the pressing force is transmitted to the push-transfer unit 520 'when the button is pressed, and the locking plate 450b moves to the left.

Due to this, the body portion 510b of the upper and lower locking plate 500b, which was fitted into the locking groove 711 of the stay rod 700, is separated from the locking groove 711, and the middle cover 200 '' and the cover 100 ) Becomes movable in the vertical direction with respect to the stay rod 700. That is, the headrest is movable in the vertical direction.

In addition, the front and rear locking plates 400b inserted in the teeth 301 are separated from the teeth 301. Accordingly, the locking is released between the locking cover 300 and the front and rear locking plates 400b, so that the locking cover 300 and the cover 100 are movable in the front-rear direction with respect to the middle cover 200 ″. That is, the headrest is movable in the front-rear direction.

In this way, the top and bottom locking and the front and rear locking of the headrest can be simultaneously released by pressing the button once, so that the position of the headrest can be adjusted according to the operation of the user moving the headrest back and forth or up and down. This improves user convenience.

On the other hand, when the headrest is moved in the front-rear direction, the front cover 110 and the rear cover 120 are moved in the front-rear direction with respect to the stay rod 700 in an integrated state, thereby reducing the clearance and flow of the headrest locking device. It can be minimized, and the structure of the device is simple, resulting in low assembly and manufacturing costs.

On the other hand, when the force pressing the button is removed, the locking plate 450b is moved to the right by the elastic force of the left and right tension ribs 517b to return to the original position. Due to this, as shown in (b) of Figure 20, the upper and lower locking plate 500b, the body portion 510b is again caught in the locking groove 711, the upper and lower positions of the headrest are locked, and the front and rear locking plates 400b Is inserted into the teeth 301 again and the front and rear positions of the headrest are locked.

The configuration and effects of the second embodiment, which are not described above, are the same as those of the first embodiment, so the first embodiment will be referred to.

As described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art may vary the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It can be carried out by changing or modifying it.

** Explanation of major symbols **
100: cover 110: front cover
120: rear cover 130: lower cover
200: middle cover 200a: front middle cover
200b: rear middle cover 203: hollow
210a: front body portion 210b: rear body portion
250a: front and rear tension rib contact portions 270a: upper and lower tension rib contact surfaces
280a: Left and right tension rib locking portion 300: Locking cover
301: tooth 310: bearing cover
320: ball bearing 400a: front and rear locking plate
500a: Upper and lower locking plate 510a: Body
700: Stay rod 710: Vertical part
840: bushing

Claims (5)

cover;
An upper and lower locking plate accommodated in the cover so as to be slidable in a direction in which the stay rod and the jam or jam are released;
A locking cover connected to the cover so that the position is maintained;
Including, but before and after the locking plate is accommodated in the cover to be slidable in the direction in which the locking cover and the jamming or jam is released;
The upper and lower locking plates or the front and rear locking plates are integrally formed locking plates,
The locking plate is formed with a first tension rib and a second tension rib that apply elastic force in a direction different from the sliding direction,
The first tension rib and the second tension rib exert elastic force in different directions,
The first tension rib, the second tension rib, the upper and lower locking plates and the front and rear locking plates are integrally formed in a plate-like headrest locking device. delete delete delete The method according to claim 1,
The front and rear locking plates are bent and connected to the upper and lower locking plates,
Headrest locking device characterized in that the bent portion is formed with ribs connected to the upper and lower locking plates and the front and rear locking plates

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