WO2018070673A1 - Headrest moving device - Google Patents

Headrest moving device Download PDF

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Publication number
WO2018070673A1
WO2018070673A1 PCT/KR2017/010094 KR2017010094W WO2018070673A1 WO 2018070673 A1 WO2018070673 A1 WO 2018070673A1 KR 2017010094 W KR2017010094 W KR 2017010094W WO 2018070673 A1 WO2018070673 A1 WO 2018070673A1
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WO
WIPO (PCT)
Prior art keywords
link
headrest
ratchet
rotatably connected
moving device
Prior art date
Application number
PCT/KR2017/010094
Other languages
French (fr)
Inventor
Hae Il Jeong
Original Assignee
Woobo Tech Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Woobo Tech Co., Ltd. filed Critical Woobo Tech Co., Ltd.
Publication of WO2018070673A1 publication Critical patent/WO2018070673A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/865—Head-rests movable or adjustable providing a fore-and-aft movement with respect to the occupant's head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/809—Head-rests movable or adjustable vertically slidable
    • B60N2/812—Head-rests movable or adjustable vertically slidable characterised by their locking devices
    • B60N2/818—Head-rests movable or adjustable vertically slidable characterised by their locking devices with stepwise positioning

Definitions

  • the present invention relates to a headrest moving device, more particularly, relates to a headrest moving device wherein the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link.
  • vehicle headrest is installed in the upper end portion of the car seat and axially rotated by a tilting device, and mainly performs a function of preventing neck injury by supporting the back of the passenger's head in case of a rear collision, or used as a head holder through lifting, lowering and rotating to suit the height of the passenger's head.
  • vehicle headrest is manufactured in a way that a monitor for viewing videos is attached to the rear side of the vehicle headrest, and it can be moved linearly so that a rear passenger can watch videos inside the vehicle while driving or stopping.
  • a horizontal moving device of a headrest of a prior art if observing a horizontal moving device of a headrest of a prior art, it has a configuration comprising: a stay rod 10, made of steel, comprising a horizontal portion 11 and a vertical portion 12 bended and extended from the both ends of the horizontal portion 11 in parallel with each other; a ratchet member 20, fixedly installed in the horizontal portion 11, formed with gear teeth on the upper end surface thereof, formed with a step at an appropriate interval from the front end of the gear teeth; a tilt adjusting member 30, made of a steel plate, with side plates both bended and extended in parallel with each other, axially coupled to the horizontal portion 11; a first torsion spring 40 coupled to and installed in the horizontal portion 11 so as to elastically bias the tilt adjusting member 30 in the reverse direction of rotation; a blocking member, separately formed with a claw for selectively engaging the gear teeth and a claw to be hooked to the step, installed on the inner surface of the one side plate so as to prevent reverse rotation of the tilt
  • the configuration of a horizontal moving device for a vehicle headrest of the prior art is that when the vehicle headrest is operated, the cover is linearly moved by a pair of links 90 disposed along the front-to-rear direction of the horizontal moving device 100, and when the claw of the blocking member reaches the end portion of the gear teeth of the ratchet member 20, the claw is separated from the gear teeth by the subsequent pressing force and the second torsion spring, and then the horizontal moving device 100 is returned to the original state thereby, that is, the linear movement and the returning process of the vehicle headrest are performed by the continuous linear movement of the horizontal moving device 100 due to the pair of links 90.
  • Patent Literature 1 Korea Registered Patent No. 510152
  • An objective of the present invention devised to solve the above described problems, is to provide a headrest moving device capable of reducing the size of the device along the front-to-rear direction, and minimizing the gap between the seat and the headrest.
  • a headrest moving device for achieving the above described objective is characterized in that and comprises: a first link; a second link rotatably connected to the one side of the first link; a third link rotatably connected to the other side of the first link; and a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link, wherein the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link.
  • the second link may be disposed in the front side of the third link.
  • a locking member for locking the position of the second link or the third link or the fourth link with respect to the first link is included, and the locking member may comprise a first ratchet and a second ratchet engaging with the first ratchet.
  • the second ratchet may be connected to the second link.
  • a headrest moving device for achieving the above described objective is characterized in that and comprises: a first link; a second link rotatably connected to the one side of the first link; a third link rotatably connected to the other side of the first link; a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link; and a locking member for locking the position of the second link or the third link or the fourth link with respect to the first link, wherein the angle of the line connecting the center of rotation of the second link with respect to the fourth link when the headrest is in the initial state and the center of rotation of the second link with respect to the fourth link when the headrest is moved to the forefront position with respect to the horizontal line or the first link is 5° or less, and when the locking of the locking member is released, the second link is rotated in forward direction to 5° or less from the angle of the step in which the headrest is moved to the forefront position.
  • a headrest moving device for achieving the above described objective is characterized in that and comprises: a first link; a second link rotatably connected to the one side of the first link; a third link rotatably connected to the other side of the first link; and a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link, wherein the second link moves forward and upward relative to the initial state when moving from the initial state to the first step, but moves forward and downward relative to the first step when moving to the second step.
  • the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link, it is possible to keep the device compact in the front-to-rear direction, and at the same time, to minimize the up-down moving distance of the headrest when moving the same distance along the front-to-rear direction, so that the gap between the seat and the headrest can be minimized.
  • the second ratchet is connected to the second link, so that the number of parts is reduced, the structure of the device becomes simpler, and the device becomes more compact.
  • Fig. 1 is an exploded perspective view illustrating the horizontal moving device of a vehicle headrest of the prior art.
  • Fig. 2 is a perspective view of a headrest moving device according to a preferred exemplary embodiment of the present invention.
  • Fig. 3 is an exploded perspective view of a headrest moving device according to a preferred exemplary embodiment of the present invention.
  • Fig. 4 is a perspective rear view of a headrest moving device according to a preferred exemplary embodiment of the present invention.
  • Fig. 5 is a side view of an initial state of a headrest moving device according to a preferred exemplary embodiment of the present invention.
  • Fig. 6 is a side view of a headrest moving device according to a preferred exemplary embodiment of the present invention when the locking is released.
  • Fig. 7 is a cross-sectional view of the initial state of a headrest moving device according to a preferred exemplary embodiment of the present invention when the locking is released.
  • Fig. 8 is a cross-sectional view of a headrest moving device according to a preferred exemplary embodiment of the present invention when the locking is released.
  • Fig. 9 is a side view illustrating the positions of the second link of the headrest moving device according to a preferred exemplary embodiment of the present invention is moved from the initial state to the state of unlocking.
  • “Lower,” “down,” “upper,” “up,” and the like are the terms representing a relative space, and they may be used to describe the relationship of one part with respect to the other part illustrated in the drawing easier. These terms are intended to include other meanings or operations of the device that is used with the meaning intended in the drawing. For example, if the device in the drawing is flipped, the part which was in the "lower” side of the other part is now in the “upper” side of the other part. Thus, the exemplary term “lower” includes all of the upper and lower directions. Device may be rotated 90°, or may be rotated at a different angle, and also the terms indicating the relative space are interpreted accordingly.
  • connection includes both “direct connection” and “indirect connection.”
  • a headrest moving device of the present exemplary embodiment is characterized in that and comprises: a first link 100; a second link 200 rotatably connected to the one side of the first link 100; a third link 300 rotatably connected to the other side of the first link 100; and a fourth link 400 whose one side is rotatably connected to the second link 200 and the other side is rotatably connected to the third link 300, wherein the distance between the point where the first link 100 is connected and the point where the fourth link 400 is connected in the second link 200 is shorter than the distance between the point where the first link 100 is connected and the point where the fourth link 400 is connected in the third link 300.
  • the first link 100 is disposed in the lower side of the device and fixedly installed in the center of the horizontal portion of a stay rod. Therefore, the first link 100 is fixed so as not to be moved along the front-to-rear direction with respect to the stay rod and the seat.
  • the first link 100 comprises a first link horizontal plate disposed horizontally and a first link vertical plate formed by being upwardly bended at the both sides of the first link horizontal plate.
  • the first link 100 is disposed along the front-to-rear direction.
  • the second link 200 is disposed in the front side of the device, and rotatably connected to the one side of the first link vertical plate of the first link 100.
  • the second link 200 is disposed along the up-down direction.
  • the second link 200 is disposed in the front side of the third link 300.
  • the second link 200 comprises a second link first vertical plate and a second link second vertical plate formed by being downwardly bended at the both sides of the second link first vertical plate.
  • the second link first vertical plate is disposed in the front side of the device.
  • a cut-out portion is formed at the right side of the second link first vertical plate so that the headrest is not interfered with the other members while moving.
  • the cut-out portion is formed so as to be penetrated through the front-to-rear direction.
  • the second link second vertical plate is disposed further outer side than the first link vertical plate.
  • the lower portion of the second link second vertical plate is rotatably installed in the first link vertical plate through a first shaft 110.
  • the second link second vertical plate is connected to the front side of the first link vertical plate.
  • the first shaft 110 is disposed along the left-to-right direction, and installed in a way that it penetrates through the first link vertical plate and the second link second vertical plate.
  • the third link 300 is rotatably connected to the other side of the first link 100.
  • the third link 300 comprises a third link first vertical plate and a third link second vertical plate formed by being forwardly bended at the both sides of the third link first vertical plate.
  • the third link 300 is disposed along the up-down direction.
  • the up-down length of the third link 300 is formed to be longer than the up-down length of the second link 200.
  • the third link first vertical plate is disposed in the rear side of the device.
  • a third link protruded portion is formed in the center portion of the third link first vertical plate along the up-down direction.
  • the third link protruded portion is formed so as to be rearwardly protruded.
  • the third link second vertical plate is disposed at the further inner side than the first link vertical plate. Therefore, interference between the second link second vertical plate and the third link second vertical plate is prevented when the headrest is moving.
  • the lower portion of the third link second vertical plate is rotatably installed in the first link vertical plate through a second shaft 120.
  • the second shaft 120 is disposed along the left-to-right direction, and disposed at the same or similar height of the first shaft 110.
  • the second shaft 120 is disposed in the rear side of the first link vertical plate, and disposed at the further rear side than the first shaft 110.
  • the one side of the fourth link 400 is rotatably connected to the second link 200, and the other side thereof is rotatably connected to the third link 300.
  • the fourth link 400 is disposed in the upper side of the first link 100, the second link 200 and the third link 300.
  • the fourth link 400 is provided with separate right and left sides.
  • Each of the left and right sides of the fourth link 400 comprises: a fourth link first vertical plate disposed vertically; and a fourth link second vertical plate formed at the front side of the fourth link first vertical plate by being bended in either towards the left or the right direction.
  • the second link second vertical plate is connected to the front side of the fourth link first vertical plate, and the third link second vertical plate is connected to the rear side thereof.
  • the second link second vertical plate is rotatably installed in the front side of the fourth link first vertical plate through third shafts 410.
  • the third shafts 410 are provided in two, and respectively installed in the fourth link first vertical plated disposed at the left and right sides.
  • the third link second vertical plate is rotatably installed in the rear side of the fourth link first vertical plate through a fourth shaft 420.
  • the fourth shaft 420 is provided and installed so as to penetrate through the fourth link first vertical plate and the third link second vertical plate which are disposed at the left and right sides thereof.
  • the third and fourth shafts 410 and 420 are also disposed along the left-to-right direction.
  • a through-hole is formed in the fourth link second vertical plate along the front-to-rear direction.
  • the headrest is connected to the fourth link second vertical plate.
  • the fourth shaft 420 is disposed further rear side than the third shaft 410 and disposed in the upper side.
  • the distance h1 between the point where the first link 100 is connected (the center of the first shaft) and the point where the fourth link 400 is connected (the center of the third shaft) in the second link 200 is shorter than the distance h2 between the point where the first link 100 is connected (the center of the second shaft) and the point where the fourth link 400 is connected (the center of the fourth shaft) in the third link 300.
  • the distance h1 between the centers of rotation of the second link 200 with respect to the first link 100 and the fourth link 400 is shorter than the distance h2 between the centers of rotation of the third link 300 with respect to the first link 100 and the fourth link 400.
  • the headrest device of the present exemplary embodiment can keep the device compact in the front-to-rear direction, and at the same time, can minimize the up-down moving distance of the headrest when moving the same distance along the front-to-rear direction, so that the gap between the seat and the headrest can be minimized.
  • the distance h1 between the point where the first link is connected (the center of the first shaft) and the point where the fourth link is connected (the center of the third shaft) in the second link disposed close to the passenger's head may be longer than the distance h2 between the point where the first link is connected (the center of the second shaft) and the point where the fourth link is connected (the center of the fourth shaft) in the third link disposed further from the passenger's head.
  • the headrest moving device of the present exemplary embodiment comprises a locking member for locking the position of the second link 200 or the third link 300 or the fourth link 400 with respect to the first link 100.
  • the locking member fixes the moved position of the headrest.
  • the locking member comprises a first ratchet 130 and a second ratchet 500 which is to be engaged with the first ratchet 130.
  • the first ratchet 130 is integrally formed on the first link vertical plate disposed at the right side of the first link 100. That is, the first ratchet 130 is fixedly connected to the first link 100.
  • the second ratchet 500 is rotatably connected to the second link 200. Unlike the previous description, the first ratchet is fixedly installed in the second link, and the second ratchet may be rotatably installed in the first link.
  • the first ratchet 130 comprises a plurality of gear teeth 131 disposed along the front-to-rear direction and a stopping threshold 132 disposed at the front side of the gear teeth 131 disposed at the forefront position.
  • the gear teeth 131 is formed in a way that the forward movement of the second ratchet 500 with respect to the first ratchet 130 is allowed, however, the rearward movement thereof is not allowed.
  • the gear teeth 131 disposed at the front side is disposed higher than the gear teeth 131 disposed at the rear side.
  • the stopping threshold 132 is formed upwardly protruded.
  • the second ratchet 500 is rotatably installed in the second link second vertical plate of the second link 200 through a fifth shaft 540 disposed along the left-to-right direction.
  • the second ratchet 500 is disposed at the upper side of the first ratchet 130.
  • the second ratchet 500 is disposed between the second link second vertical plate and the third link second vertical plate.
  • a protruded portion 510 which is to be inserted into the gear teeth 131 is formed in the rear side; a first stopping protrusion 511 which is to be stopped by a stopping threshold 132 is formed downwardly protruded in the front side of the protruded portion 510; and a second stopping protrusion 520 which is spaced apart from the first stopping protrusion 511 and to be stopped by the stopping threshold 132 is formed downwardly protruded.
  • the protruded portion 510 and the first stopping protrusion 511 are disposed at further rear side than the fifth shaft 540, and the second stopping protrusion 520 is disposed at further front side than the fifth shaft 540.
  • a ratchet spring 530 for applying an elastic force to the second ratchet 500 is further provided.
  • the one end of the ratchet spring 530 is stopped by the second link 200, and the other end thereof is stopped by the second ratchet 500.
  • a spring stopping portion where the ratchet spring 530 is stopped is formed so as to be disposed further rear side than the fifth shaft 540.
  • a return spring 600 which returns the headrest to the original position when the engagement between the first ratchet 130 and the second ratchet 500 is released is provided.
  • the return spring 600 is provided with a coil spring.
  • the center portion of the return spring 600 is inserted into the second shaft 120, the one end of the return spring 600 is stopped by the first link horizontal plate of the first link 100, and the other end is stopped by the third link first vertical plate of the third link 300.
  • the position of the headrest can be adjusted to three steps (except the initial state).
  • the headrest is slightly moved upward and moved forward as compared with the upright position (the initial state).
  • the headrest is slightly moved downward and moved forward as compared with the first step.
  • the headrest is slightly moved downward and moved forward as compared with the second step.
  • the headrest is slightly moved downward and moved forward as compared with the second step.
  • the angle of the line connecting the center of the third shaft 410 which is the center of rotation of the second link 200 with respect to the fourth link 400 when the headrest is in the initial state and the center of the third shaft 410 which is the center of rotation of the second link 200 with respect to the fourth link 400 when the headrest is moved to the forefront position (the third step), with respect to the horizontal line or the first link (operating direction angle) is 5°or less.
  • the second link 200 is rotated in forward direction to 5°(a) or less than in the step in which the headrest is moved to the forefront position (the third step).
  • the second ratchet 500 is rotated counterclockwise when viewed from the right side, and the protruded portion 510 is separated from the gear teeth 131 and disposed in the upper side of the gear teeth 131. In this way, the rotated state of the second ratchet 500 is stably maintained by the ratchet spring 530.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)

Abstract

The present invention relates to a headrest moving device, more particularly, relates to a headrest moving device wherein the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link, so that it is possible to keep the device compact in the front-to-rear direction, and at the same time, to minimize the up-down moving distance of the headrest when moving the same distance along the front-to-rear direction, so that the gap between the seat and the headrest can be minimized.

Description

HEADREST MOVING DEVICE
The present invention relates to a headrest moving device, more particularly, relates to a headrest moving device wherein the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link.
Generally, vehicle headrest is installed in the upper end portion of the car seat and axially rotated by a tilting device, and mainly performs a function of preventing neck injury by supporting the back of the passenger's head in case of a rear collision, or used as a head holder through lifting, lowering and rotating to suit the height of the passenger's head.
Recently, in addition to the function to prevent neck injury and head support, vehicle headrest is manufactured in a way that a monitor for viewing videos is attached to the rear side of the vehicle headrest, and it can be moved linearly so that a rear passenger can watch videos inside the vehicle while driving or stopping.
As for an example, as shown in Fig. 1, if observing a horizontal moving device of a headrest of a prior art, it has a configuration comprising: a stay rod 10, made of steel, comprising a horizontal portion 11 and a vertical portion 12 bended and extended from the both ends of the horizontal portion 11 in parallel with each other; a ratchet member 20, fixedly installed in the horizontal portion 11, formed with gear teeth on the upper end surface thereof, formed with a step at an appropriate interval from the front end of the gear teeth; a tilt adjusting member 30, made of a steel plate, with side plates both bended and extended in parallel with each other, axially coupled to the horizontal portion 11; a first torsion spring 40 coupled to and installed in the horizontal portion 11 so as to elastically bias the tilt adjusting member 30 in the reverse direction of rotation; a blocking member, separately formed with a claw for selectively engaging the gear teeth and a claw to be hooked to the step, installed on the inner surface of the one side plate so as to prevent reverse rotation of the tilt adjusting member 30; a second torsion spring with one end hooked to the upper end portion of the one side plate of the tilt adjusting member 30 and the other end hooked to the upper end portion of the blocking member; a horizontal moving device 100 provided with a pair of link 90 so as to horizontally move a cover wherein the tilt adjusting member 30 is mounted along the front-to-rear direction; and a connecting shaft 95 for connecting the horizontal moving device 100 and the tilt adjusting member 30.
The configuration of a horizontal moving device for a vehicle headrest of the prior art is that when the vehicle headrest is operated, the cover is linearly moved by a pair of links 90 disposed along the front-to-rear direction of the horizontal moving device 100, and when the claw of the blocking member reaches the end portion of the gear teeth of the ratchet member 20, the claw is separated from the gear teeth by the subsequent pressing force and the second torsion spring, and then the horizontal moving device 100 is returned to the original state thereby, that is, the linear movement and the returning process of the vehicle headrest are performed by the continuous linear movement of the horizontal moving device 100 due to the pair of links 90.
However, since the lengths of the two links 90 disposed in the up-down direction of the horizontal moving device 100 are the same, there is a problem that the size of the apparatus in the front-to-rear direction becomes bulky, and besides, there is another problem that when the headrest is moved forward, the difference between the minimum height and the maximum height of the headrest is large therefore the gap between the seat and the headrest becomes large.
[Leading Technical Literatures]
[Patent Literature]
[Patent Literature 1] Korea Registered Patent No. 510152
An objective of the present invention, devised to solve the above described problems, is to provide a headrest moving device capable of reducing the size of the device along the front-to-rear direction, and minimizing the gap between the seat and the headrest.
A headrest moving device for achieving the above described objective is characterized in that and comprises: a first link; a second link rotatably connected to the one side of the first link; a third link rotatably connected to the other side of the first link; and a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link, wherein the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link. The second link may be disposed in the front side of the third link.
A locking member for locking the position of the second link or the third link or the fourth link with respect to the first link is included, and the locking member may comprise a first ratchet and a second ratchet engaging with the first ratchet.
The second ratchet may be connected to the second link.
A headrest moving device for achieving the above described objective is characterized in that and comprises: a first link; a second link rotatably connected to the one side of the first link; a third link rotatably connected to the other side of the first link; a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link; and a locking member for locking the position of the second link or the third link or the fourth link with respect to the first link, wherein the angle of the line connecting the center of rotation of the second link with respect to the fourth link when the headrest is in the initial state and the center of rotation of the second link with respect to the fourth link when the headrest is moved to the forefront position with respect to the horizontal line or the first link is 5° or less, and when the locking of the locking member is released, the second link is rotated in forward direction to 5° or less from the angle of the step in which the headrest is moved to the forefront position.
A headrest moving device for achieving the above described objective is characterized in that and comprises: a first link; a second link rotatably connected to the one side of the first link; a third link rotatably connected to the other side of the first link; and a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link, wherein the second link moves forward and upward relative to the initial state when moving from the initial state to the first step, but moves forward and downward relative to the first step when moving to the second step.
According to the headrest moving device of the present invention as described above, the following effects can be obtained.
Since the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link, it is possible to keep the device compact in the front-to-rear direction, and at the same time, to minimize the up-down moving distance of the headrest when moving the same distance along the front-to-rear direction, so that the gap between the seat and the headrest can be minimized.
The second ratchet is connected to the second link, so that the number of parts is reduced, the structure of the device becomes simpler, and the device becomes more compact.
Fig. 1 is an exploded perspective view illustrating the horizontal moving device of a vehicle headrest of the prior art.
Fig. 2 is a perspective view of a headrest moving device according to a preferred exemplary embodiment of the present invention.
Fig. 3 is an exploded perspective view of a headrest moving device according to a preferred exemplary embodiment of the present invention.
Fig. 4 is a perspective rear view of a headrest moving device according to a preferred exemplary embodiment of the present invention.
Fig. 5 is a side view of an initial state of a headrest moving device according to a preferred exemplary embodiment of the present invention.
Fig. 6 is a side view of a headrest moving device according to a preferred exemplary embodiment of the present invention when the locking is released.
Fig. 7 is a cross-sectional view of the initial state of a headrest moving device according to a preferred exemplary embodiment of the present invention when the locking is released.
Fig. 8 is a cross-sectional view of a headrest moving device according to a preferred exemplary embodiment of the present invention when the locking is released.
Fig. 9 is a side view illustrating the positions of the second link of the headrest moving device according to a preferred exemplary embodiment of the present invention is moved from the initial state to the state of unlocking.
Hereinafter, a preferred exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings as follows.
For reference, the components of the present invention which will be described hereinafter and are same as those of the prior art will not be described in detail separately, but instead, will be referred to the prior art described above.
When it is mentioned that one part is on the "top" of other part, this means that the part may be directly on the top of the other part or another different part may be associated with therebetween.　In contrast, if it is mentioned that one part is "directly on the top" of the other part, no other part is interposed therebetween.
The terminology used is merely to refer to a particular embodiment and are not intended to limit the present invention.　As used herein, the singular forms also include the plural form of text that does not indicate clearly the significance of the opposite.　The meaning of "comprising" as used in the specification embodies a specific characteristic, region, integers, steps, operations, elements and/or components, however, it does not exclude the presence or addition of other specific characteristics, regions, integers, steps, operations, elements, components and/or groups.
"Lower," "down," "upper," "up," and the like are the terms representing a relative space, and they may be used to describe the relationship of one part with respect to the other part illustrated in the drawing easier.　These terms are intended to include other meanings or operations of the device that is used with the meaning intended in the drawing.　For example, if the device in the drawing is flipped, the part which was in the "lower" side of the other part is now in the "upper" side of the other part.　Thus, the exemplary term "lower" includes all of the upper and lower directions.　Device may be rotated 90°, or may be rotated at a different angle, and also the terms indicating the relative space are interpreted accordingly.
Hereinafter, the term "connection" includes both "direct connection" and "indirect connection."
As illustrated in Figs. 2 to 9, a headrest moving device of the present exemplary embodiment is characterized in that and comprises: a first link 100; a second link 200 rotatably connected to the one side of the first link 100; a third link 300 rotatably connected to the other side of the first link 100; and a fourth link 400 whose one side is rotatably connected to the second link 200 and the other side is rotatably connected to the third link 300, wherein the distance between the point where the first link 100 is connected and the point where the fourth link 400 is connected in the second link 200 is shorter than the distance between the point where the first link 100 is connected and the point where the fourth link 400 is connected in the third link 300.
The first link 100 is disposed in the lower side of the device and fixedly installed in the center of the horizontal portion of a stay rod. Therefore, the first link 100 is fixed so as not to be moved along the front-to-rear direction with respect to the stay rod and the seat.
The first link 100 comprises a first link horizontal plate disposed horizontally and a first link vertical plate formed by being upwardly bended at the both sides of the first link horizontal plate.
The first link 100 is disposed along the front-to-rear direction.
The second link 200 is disposed in the front side of the device, and rotatably connected to the one side of the first link vertical plate of the first link 100.
The second link 200 is disposed along the up-down direction.
The second link 200 is disposed in the front side of the third link 300.
The second link 200 comprises a second link first vertical plate and a second link second vertical plate formed by being downwardly bended at the both sides of the second link first vertical plate.
The second link first vertical plate is disposed in the front side of the device. A cut-out portion is formed at the right side of the second link first vertical plate so that the headrest is not interfered with the other members while moving. The cut-out portion is formed so as to be penetrated through the front-to-rear direction.
The second link second vertical plate is disposed further outer side than the first link vertical plate.
The lower portion of the second link second vertical plate is rotatably installed in the first link vertical plate through a first shaft 110.
The second link second vertical plate is connected to the front side of the first link vertical plate.
The first shaft 110 is disposed along the left-to-right direction, and installed in a way that it penetrates through the first link vertical plate and the second link second vertical plate.
The third link 300 is rotatably connected to the other side of the first link 100.
The third link 300 comprises a third link first vertical plate and a third link second vertical plate formed by being forwardly bended at the both sides of the third link first vertical plate.
The third link 300 is disposed along the up-down direction. The up-down length of the third link 300 is formed to be longer than the up-down length of the second link 200.
The third link first vertical plate is disposed in the rear side of the device.
A third link protruded portion is formed in the center portion of the third link first vertical plate along the up-down direction. The third link protruded portion is formed so as to be rearwardly protruded.
The third link second vertical plate is disposed at the further inner side than the first link vertical plate. Therefore, interference between the second link second vertical plate and the third link second vertical plate is prevented when the headrest is moving.
The lower portion of the third link second vertical plate is rotatably installed in the first link vertical plate through a second shaft 120.
The second shaft 120 is disposed along the left-to-right direction, and disposed at the same or similar height of the first shaft 110.
The second shaft 120 is disposed in the rear side of the first link vertical plate, and disposed at the further rear side than the first shaft 110.
The one side of the fourth link 400 is rotatably connected to the second link 200, and the other side thereof is rotatably connected to the third link 300.
The fourth link 400 is disposed in the upper side of the first link 100, the second link 200 and the third link 300.
The fourth link 400 is provided with separate right and left sides.
Each of the left and right sides of the fourth link 400 comprises: a fourth link first vertical plate disposed vertically; and a fourth link second vertical plate formed at the front side of the fourth link first vertical plate by being bended in either towards the left or the right direction.
The second link second vertical plate is connected to the front side of the fourth link first vertical plate, and the third link second vertical plate is connected to the rear side thereof.
The second link second vertical plate is rotatably installed in the front side of the fourth link first vertical plate through third shafts 410.
The third shafts 410 are provided in two, and respectively installed in the fourth link first vertical plated disposed at the left and right sides.
The third link second vertical plate is rotatably installed in the rear side of the fourth link first vertical plate through a fourth shaft 420.
The fourth shaft 420 is provided and installed so as to penetrate through the fourth link first vertical plate and the third link second vertical plate which are disposed at the left and right sides thereof.
The third and fourth shafts 410 and 420 are also disposed along the left-to-right direction.
A through-hole is formed in the fourth link second vertical plate along the front-to-rear direction. The headrest is connected to the fourth link second vertical plate.
In this way, the front-to-rear movement of the headrest of the present exemplary embodiment is guided through a four-bar linkage.
The fourth shaft 420 is disposed further rear side than the third shaft 410 and disposed in the upper side.
Therefore, the distance h1 between the point where the first link 100 is connected (the center of the first shaft) and the point where the fourth link 400 is connected (the center of the third shaft) in the second link 200 is shorter than the distance h2 between the point where the first link 100 is connected (the center of the second shaft) and the point where the fourth link 400 is connected (the center of the fourth shaft) in the third link 300.
In other words, the distance h1 between the centers of rotation of the second link 200 with respect to the first link 100 and the fourth link 400 is shorter than the distance h2 between the centers of rotation of the third link 300 with respect to the first link 100 and the fourth link 400.
Due to this, the headrest device of the present exemplary embodiment can keep the device compact in the front-to-rear direction, and at the same time, can minimize the up-down moving distance of the headrest when moving the same distance along the front-to-rear direction, so that the gap between the seat and the headrest can be minimized.
Unlike the previous description, the distance h1 between the point where the first link is connected (the center of the first shaft) and the point where the fourth link is connected (the center of the third shaft) in the second link disposed close to the passenger's head the may be longer than the distance h2 between the point where the first link is connected (the center of the second shaft) and the point where the fourth link is connected (the center of the fourth shaft) in the third link disposed further from the passenger's head.
The headrest moving device of the present exemplary embodiment comprises a locking member for locking the position of the second link 200 or the third link 300 or the fourth link 400 with respect to the first link 100.
That is, the locking member fixes the moved position of the headrest.
The locking member comprises a first ratchet 130 and a second ratchet 500 which is to be engaged with the first ratchet 130.
The first ratchet 130 is integrally formed on the first link vertical plate disposed at the right side of the first link 100. That is, the first ratchet 130 is fixedly connected to the first link 100.
The second ratchet 500 is rotatably connected to the second link 200. Unlike the previous description, the first ratchet is fixedly installed in the second link, and the second ratchet may be rotatably installed in the first link.
The first ratchet 130 comprises a plurality of gear teeth 131 disposed along the front-to-rear direction and a stopping threshold 132 disposed at the front side of the gear teeth 131 disposed at the forefront position.
The gear teeth 131 is formed in a way that the forward movement of the second ratchet 500 with respect to the first ratchet 130 is allowed, however, the rearward movement thereof is not allowed.
The gear teeth 131 disposed at the front side is disposed higher than the gear teeth 131 disposed at the rear side.
The stopping threshold 132 is formed upwardly protruded.
The second ratchet 500 is rotatably installed in the second link second vertical plate of the second link 200 through a fifth shaft 540 disposed along the left-to-right direction.
The second ratchet 500 is disposed at the upper side of the first ratchet 130. The second ratchet 500 is disposed between the second link second vertical plate and the third link second vertical plate.
In the second ratchet 500: a protruded portion 510 which is to be inserted into the gear teeth 131 is formed in the rear side; a first stopping protrusion 511 which is to be stopped by a stopping threshold 132 is formed downwardly protruded in the front side of the protruded portion 510; and a second stopping protrusion 520 which is spaced apart from the first stopping protrusion 511 and to be stopped by the stopping threshold 132 is formed downwardly protruded.
The protruded portion 510 and the first stopping protrusion 511 are disposed at further rear side than the fifth shaft 540, and the second stopping protrusion 520 is disposed at further front side than the fifth shaft 540.
In addition, a ratchet spring 530 for applying an elastic force to the second ratchet 500 is further provided.
The one end of the ratchet spring 530 is stopped by the second link 200, and the other end thereof is stopped by the second ratchet 500.
In the second ratchet 500, a spring stopping portion where the ratchet spring 530 is stopped is formed so as to be disposed further rear side than the fifth shaft 540.
Further, a return spring 600 which returns the headrest to the original position when the engagement between the first ratchet 130 and the second ratchet 500 is released is provided.
The return spring 600 is provided with a coil spring. The center portion of the return spring 600 is inserted into the second shaft 120, the one end of the return spring 600 is stopped by the first link horizontal plate of the first link 100, and the other end is stopped by the third link first vertical plate of the third link 300.
Hereinafter, the operation of the present exemplary embodiment having the above described configuration will be described.
When the headrest in an upright state is pushed forward, the upper portions of the second link 200 and the third link 300, and the fourth link 400 and the second ratchet 500 are pushed forward with respect to the first link 100 and the first ratchet 130. When the pushing force is removed after the headrest is moved as desired, the protruded portion 510 of the second ratchet 500 is engaged with the gear teeth 131 of the first ratchet 130, thereby fixing the position of the headrest.
In the present exemplary embodiment, as illustrated in Fig. 9, the position of the headrest can be adjusted to three steps (except the initial state). When the headrest is moved to the first step, the headrest is slightly moved upward and moved forward as compared with the upright position (the initial state). When the headrest is moved to the second step, the headrest is slightly moved downward and moved forward as compared with the first step. When the headrest is moved to the third step, the headrest is slightly moved downward and moved forward as compared with the second step. When the headrest is pushed further forward than the third step, the engagement between the first ratchet 130 and the second ratchet 500 is released, and the headrest is returned to the upright position by the elastic force of the return spring 600.
The angle of the line connecting the center of the third shaft 410 which is the center of rotation of the second link 200 with respect to the fourth link 400 when the headrest is in the initial state and the center of the third shaft 410 which is the center of rotation of the second link 200 with respect to the fourth link 400 when the headrest is moved to the forefront position (the third step), with respect to the horizontal line or the first link (operating direction angle) is 5°or less.
Further, when the locking member is unlocked, the second link 200 is rotated in forward direction to 5°(a) or less than in the step in which the headrest is moved to the forefront position (the third step).
The re-engagement process after the engagement between the first ratchet 130 and the second ratchet 500 is released will be described in detail as follows.
When the headrest is pushed further forward than the third step, since the first stopping protrusion 511 is stopped by the stopping threshold 132, the second ratchet 500 is rotated counterclockwise when viewed from the right side, and the protruded portion 510 is separated from the gear teeth 131 and disposed in the upper side of the gear teeth 131. In this way, the rotated state of the second ratchet 500 is stably maintained by the ratchet spring 530. Next, when the upper portions of the second link 200 and the third link 300, and the fourth link 400 and the second ratchet 500 are moved rearward with respect to the first link 100 and the first ratchet 130 by the return spring 600, since the second stopping protrusion 520 is stopped by the stopping threshold 132 as the protruded portion 510 approaches to the gear teeth 131 disposed at the rearmost position, the second ratchet 500 is rotated clockwise so that the protruded portion 510 is engaged with the gear teeth 131 disposed at the rearmost position. The engaged state between the protruded portion 510 and the gear teeth 131 is stably maintained by the ratchet spring 530.
A more detailed description of the operating state of the locking member will be omitted since it is described in the prior art and the like.
As described above, although the present invention has been described with reference to the preferred exemplary embodiments, various changes and alterations of the present invention can be made by those skilled in the art without departing from the spirit and the scope of the present invention written in the claims described herein below.
[Description of Symbols]
[Description of numerals for major elements in drawings]
100: first link, 110: first shaft
120: second shaft, 130: first ratchet
131: gear teeth, 132: stopping threshold
200: second link, 300: third link
400: fourth link, 410: third shaft
420: fourth shaft, 500: second ratchet
510: protruded portion, 511: first stopping protrusion
520: second stopping protrusion, 530: ratchet spring
540: fifth shaft, 600: return spring

Claims (6)

  1. A headrest moving device comprising:
    a first link;
    a second link rotatably connected to the one side of the first link;
    a third link rotatably connected to the other side of the first link; and
    a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link, wherein the distance between the point where the first link is connected and the point where the fourth link is connected in the second link is shorter than the distance between the point where the first link is connected and the point where the fourth link is connected in the third link.
  2. The headrest moving device according to claim 1, wherein the second link is disposed in the front side of the third link.
  3. The headrest moving device according to claim 1 or claim 2, comprising:
    a locking member for locking the position of the second link or the third link or the fourth link with respect to the first link, wherein the locking member comprises a first ratchet and a second ratchet engaging with the first ratchet.
  4. The headrest moving device according to claim 3, wherein the second ratchet is connected to the second link.
  5. A headrest moving device comprising:
    a first link;
    a second link rotatably connected to the one side of the first link;
    a third link rotatably connected to the other side of the first link;
    a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link; and
    a locking member for locking the position of the second link or the third link or the fourth link with respect to the first link, wherein the angle of the line connecting the center of rotation of the second link with respect to the fourth link when the headrest is in the initial state and the center of rotation of the second link with respect to the fourth link when the headrest is moved to the forefront position with respect to the horizontal line or the first link is 5° or less, and when the locking of the locking member is released, the second link is rotated in forward direction to 5° or less from the angle of the step in which the headrest is moved to the forefront position.
  6. A headrest moving device comprising:
    a first link;
    a second link rotatably connected to the one side of the first link;
    a third link rotatably connected to the other side of the first link; and
    a fourth link whose one side is rotatably connected to the second link and the other side is rotatably connected to the third link, wherein the second link moves forward and upward relative to the initial state when moving from the initial state to the first step but moves forward and downward relative to the first step when moving to the second step.
PCT/KR2017/010094 2016-10-13 2017-09-14 Headrest moving device WO2018070673A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020160132923A KR20180040951A (en) 2016-10-13 2016-10-13 Headrest moving device
KR10-2016-0132923 2016-10-13

Publications (1)

Publication Number Publication Date
WO2018070673A1 true WO2018070673A1 (en) 2018-04-19

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ID=61906341

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Application Number Title Priority Date Filing Date
PCT/KR2017/010094 WO2018070673A1 (en) 2016-10-13 2017-09-14 Headrest moving device

Country Status (2)

Country Link
KR (1) KR20180040951A (en)
WO (1) WO2018070673A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102703294B1 (en) 2019-05-15 2024-09-06 주식회사 다스 Translational displacement device of headrest

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040089410A (en) * 2003-04-14 2004-10-21 정해일 Headrest
KR100730483B1 (en) * 2005-12-22 2007-06-20 최순봉 Headrest for cars
KR20070097302A (en) * 2006-03-28 2007-10-04 주식회사 우보테크 Headrest for cars
JP2012162123A (en) * 2011-02-04 2012-08-30 Ts Tech Co Ltd Apparatus for adjusting front/rear position of headrest
KR101570427B1 (en) * 2014-07-11 2015-11-19 주식회사 우보테크 Headrest Moving Device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040089410A (en) * 2003-04-14 2004-10-21 정해일 Headrest
KR100730483B1 (en) * 2005-12-22 2007-06-20 최순봉 Headrest for cars
KR20070097302A (en) * 2006-03-28 2007-10-04 주식회사 우보테크 Headrest for cars
JP2012162123A (en) * 2011-02-04 2012-08-30 Ts Tech Co Ltd Apparatus for adjusting front/rear position of headrest
KR101570427B1 (en) * 2014-07-11 2015-11-19 주식회사 우보테크 Headrest Moving Device

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