KR20240026771A - Device for adjusting front and rear position of headrest of car - Google Patents

Abstract

The present invention relates to a device for adjusting the front and rear position of a headrest of an automobile, comprising an upper body horizontally mounted on the top of a stay rod, a lower body mounted on the lower surface of the upper body, and a device that moves forward and backward between the upper body and the lower body. A base member is formed with a headrest mounting portion that can be inserted and installed at the front end, and has a pawl operation hole formed on one side with a latch gear, and is rotatably installed on the lower body through the pawl operation hole. a pawl that is selectively engaged with one of a plurality of gear teeth of the latch gear, a release plate rotatably installed on the base member and rotating the pawl to the release position when the base member moves to the forefront, and the upper It includes a return spring that is connected between the body and the headrest mounting portion and always applies a restoring force to move the base member rearward.
Therefore, it is advantageous for slimming the headrest, preventing release of the pole due to downward impact while driving, and when the pole is released due to collision inertia, the headrest is re-fixed further forward rather than moving to the rearmost position, thus reducing the occupant's neck. Injuries can be alleviated.

Description

Device for adjusting the front and rear position of the headrest of a car {DEVICE FOR ADJUSTING FRONT AND REAR POSITION OF HEADREST OF CAR}

The present invention relates to a device for adjusting the front and rear position of a headrest in a vehicle, and more specifically, to a device for adjusting the front and rear position of a headrest in a vehicle that allows a passenger to easily adjust the front and rear position manually.

The headrest of a car seat is a safety device that supports the occupant's head. Passengers can rest their heads against the headrest while sitting in the seat, and when a collision or rear-end accident occurs while driving the vehicle, the headrest stably supports the head, preventing cervical spine damage.

Meanwhile, the headrest is capable of adjusting its position in the front-to-back direction according to the occupant's physical condition, and an example of a device for adjusting the front-back position of the headrest according to the prior art is disclosed in Patent Document 1 below.

The device for adjusting the front and rear position of the headrest of Patent Document 1 is configured to allow the headrest to move linearly in the front and rear direction using a guide pipe and a guide rod, and a latch plate with a plurality of gear teeth is provided on a housing inside the headrest, , a pole that hangs on the latch plate is installed on a mounting bracket mounted on the stay rod of the headrest. The pawls allow forward movement of the latch plate and restrict backward movement.

Therefore, the front-to-back position of the housing, that is, the front-to-back position of the headrest, can be adjusted depending on which gear of the latch plate the pole is hung on.

However, in the device for adjusting the front and rear position of the headrest according to the prior art as described above, the housing is made of a box structure, and the headrest is installed in a structure that surrounds the entire housing, so that the housing occupies a lot of space inside the headrest. This not only made it difficult to install other devices inside the headrest, but also hindered the production of a slimmer headrest by ultimately increasing the size of the headrest.

In addition, the conventional headrest front/back position adjusting device had a latch plate installed vertically so that the pole could rotate in the up and down direction. Therefore, if a large impact occurs downward while the vehicle is driving, there is a risk that the engagement state between the latch plate and the pawl may be released, and when the latch plate fixation by the pawl is released, the headrest returns to the rearmost position (initial position). As a result, the headrest position adjusted by the occupant changes, and the occupant's head is no longer supported in the optimal position.

In addition, in the conventional headrest front/back position adjusting device, when a collision accident occurs, the headrest moves to the front due to driving inertia and the pole can be switched to a released state. Therefore, the headrest is returned to the rearmost position, and at this time, the occupant's head, which moves forward due to inertia during a collision and is thrown backward after colliding with the dashboard, cannot be supported from the front, which increases the degree of injury to the occupant. there was.

Conventional technology is technical information that the inventor possessed for deriving the present invention or acquired in the process of deriving the present invention, and cannot necessarily be said to be known technology disclosed to the general public before filing the application for the present invention.

Republic of Korea Patent Publication No. 10-2109388 (announced on May 12, 2020)

In solving the above-described problems, the purpose of the present invention is to provide a device for adjusting the front and rear position of the headrest of an automobile that can slim the headrest by changing the shape and installation structure of the component parts.

Another object of the present invention is to provide a device for adjusting the front and rear position of the headrest of a vehicle, which prevents the fixed state of the pole from being released due to a downward impact while driving, thereby stably maintaining the set position of the headrest.

In addition, the purpose of the present invention is to provide a device for adjusting the front and rear position of the headrest of a vehicle, which improves the safety performance of the headrest by preventing complete release of the pole even if the headrest moves to the front position due to inertia in the event of a collision accident.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned can be clearly understood by a person skilled in the art to which the present invention belongs from the following description. There will be.

A device for adjusting the front and rear position of a headrest of a vehicle according to an embodiment of the present invention includes an upper body horizontally mounted on the top of a stay rod; a lower body mounted on the lower surface of the upper body; a base member that is movably inserted and installed between the upper body and the lower body, has a headrest mounting portion on which a headrest is mounted at the front end, and has a pawl operating hole formed on one side with a latch gear formed therethrough; a pawl rotatably installed on the lower body through the pawl operating hole and selectively engaged with one of a plurality of gear teeth of the latch gear; a release plate rotatably installed on the base member and rotating the pawl to a release position when the base member moves to the forefront; It includes a return spring that is connected between the upper body and the headrest mounting portion and always applies a restoring force to move the base member rearward.

Flanges formed at the top of both walls of the lower body are bolted to the lower surface of the upper body, stay rod mounting portions concave downward are formed at both ends of the upper body, and the stay rod mounting portion has an upper horizontal portion of the stay rod. It is placed and welded.

Bearings are installed on both walls of the lower body, and the bearings are equipped with a plurality of steel balls in the longitudinal direction on a straight retainer, and guide grooves into which some of the steel balls are inserted and seated are formed on both sides of the base member. .

The release plate is rotatably installed on the base member via a second mounting pin, and on one side of the outer surface of the release plate, a pawl is located behind the rearmost gear of the latch gear in the operation standby position, and the pawl is engaged with the rearmost gear. A first locking protrusion is formed that is pushed by the pawl to rotate the release plate from the operation standby position to the release position, and on the other side of the outer surface of the release plate, an outer area of the pawl operation hole is formed when the release plate is in the operation standby position. When the release plate is rotated to the release position, a second locking protrusion is formed that protrudes into the inner area of the pawl operation hole.

A locking protrusion on which the second locking protrusion is caught is formed on one side of the pole, and when the base member moves from the position engaged with the rearmost gear tooth to the front, the locking protrusion is caught by the second locking protrusion and the pole rotates to the release position. do.

When the base member is moved to the rearmost position by the return spring when the pawl is in the release position, the pawl is guided to the inner surface of the pawl operation hole and inserted into the frontmost gear groove of the latch gear.

A stopper groove is formed on another side of the outer surface of the release plate, and a stopper pin fixed to the base member is provided on the inside of the stopper groove, and the stopper pin abuts the lower and upper surfaces of the stopper groove. The operation standby position and release position of the release plate are precisely limited.

A third locking protrusion is formed on another side of the outer surface of the release plate, and a manipulation protrusion is formed on the lower surface of the upper body in response to the third locking protrusion. With the release plate in the release position, the base member is positioned at the forefront. When moving from to the rearmost position, the third locking protrusion is caught by the operating protrusion and the release plate is rotated to the operation standby position.

A first position change spring is installed between the pawl and the lower body to assist the pawl in changing its position between the engagement position and the release position and maintain the changed position.

A second position change spring is installed between the release plate and the base member to assist the release plate in changing its position between the operation standby position and the release position and maintain the changed position.

As described above, the device for adjusting the front and rear position of the headrest of a vehicle according to the present invention has an advantageous effect in slimming the headrest by changing the shape and installation structure of the component parts so that the components do not occupy a large amount of the internal space of the headrest. .

In addition, in the device for adjusting the front and rear position of the headrest of a car according to the present invention, the pole is installed and operated in a horizontal state, so that the fixed state of the pole is not released due to a downward impact while driving, thereby stably maintaining the set position of the headrest. There is an effect.

In addition, the device for adjusting the front and rear position of the headrest of a car according to the present invention allows the pole to remain in a fully released state even if the headrest at any set position (excluding the rearmost fixed end) moves to the front due to inertia when a collision accident occurs. By preventing switching, the headrest does not return to the rearmost position, and as a result, the headrest can support the occupant's head that bounces backwards after moving from the front, thereby alleviating the severity of the occupant's cervical spine injury. There is an effect.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

Figure 1 is a perspective view of an installed state of a device for adjusting the front and rear headrest positions of a vehicle according to the present invention.
Figure 2 is an enlarged perspective view of the headrest front and rear position adjusting device.
Figure 3 is a diagram showing a state in which the upper body in Figure 2 has been removed.
Figure 4 is a diagram showing a state in which the base member in Figure 3 has been removed.
Figure 5 is a perspective view showing the bottom structure of the upper body.
Figure 6 is a diagram showing a state in which the headrest is located at the rearmost position and the pawl is coupled to the frontmost position (position 0) of the latch gear.
Figure 7 is a diagram showing the initial state in which the headrest is advanced and the pawl is coupled to the rearmost position (3rd position) of the latch gear.
Figure 8 is a diagram showing the state in which the pawl is fully engaged in the rearmost position (third position) of the latch gear and the release plate is rotated to the release position in the state of Figure 7.
Figure 9 is a diagram showing a state in which the headrest is further advanced and the pole is rotated to the release position by the release plate in the state of Figure 8.

The present invention In the present invention, the accompanying drawings may be shown in exaggerated expressions for differentiation and clarity from the prior art and for convenience in understanding the technology. In addition, the terms described below are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the rider or operator, so definitions of these terms should be made based on the technical content throughout this specification. will be. Meanwhile, the examples are merely illustrative of the components presented in the claims of the present invention and do not limit the scope of the present invention, and the scope of the rights should be interpreted based on the technical idea throughout the specification of the present invention. .

Throughout the specification, when a certain configuration is said to “include” a certain configuration, this means that other configurations may be further included rather than excluding other configurations, unless specifically stated to the contrary.

In addition, when a configuration is said to be “connected,” “connected,” or “coupled” to another configuration, this does not only mean “directly connected,” “directly connected,” or “directly coupled,” but also means “that.” This means that there may be cases of ‘connection with another configuration in the middle’, ‘connection with another configuration in the middle’, or ‘combined with another configuration in the middle’. On the other hand, when a configuration is said to be “directly connected,” “directly connected,” or “directly coupled” to another configuration, it should be understood that no other configuration exists in between.

Additionally, when directional terms such as “front”, “back”, “top”, “bottom”, “left”, “right”, “one end”, “other end”, “both ends”, etc. are used, this refers to the disclosed drawings. They are used illustratively in relation to the orientation and should not be construed as limiting, and when terms such as “first” and “second” are used, these are terms for distinguishing each configuration and should not be construed as restrictive. .

In order to more clearly explain the characteristics of the embodiments of the present invention, detailed descriptions will be omitted regarding matters widely known to those skilled in the art to which the following embodiments belong. In addition, detailed description of parts in the drawings that are not related to the description of the embodiment will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a perspective view of an installed state of a device for adjusting the front and rear position of the headrest of a vehicle according to the present invention, Figure 2 is an enlarged perspective view of the device for adjusting the front and rear position of the headrest, and Figure 3 shows a state in which the upper body in Figure 2 is removed. It is a drawing, FIG. 4 is a drawing showing a state in which the base member in FIG. 3 is removed, and FIG. 5 is a perspective view showing the bottom structure of the upper body.

1 to 5, the device for adjusting the front and rear position of the headrest of a vehicle according to the present invention includes an upper body (10), a lower body (20), a base member (30), a pole (40), and a release plate (50). ), bearing 60, and return spring 70.

The upper body 10 has a substantially rectangular flat shape and forms a forward and backward movement passage of the base member 30 together with the lower body 20. In addition, the upper body (10) serves to secure the entire 'headrest front and rear position adjustment device' to the stay rod (1). For this purpose, stay rod mounting portions 11 that are concave downward are formed on both ends of the upper body 10. The upper horizontal portion of the stay rod (1) is welded to the stay rod mounting portion (11). Therefore, when the stay rod (1) is inserted and installed into the installation hole formed at the top of the seatback, the 'headrest front and rear position adjusting device' is located at the top of the seatback.

Additionally, a first hook 12 is formed at the center of the rear end of the upper body 10 to hang one end of the return spring 70.

In addition, an operating protrusion 13 that rotates the release plate 50 from the release position to the standby position is formed to protrude on one side of the bottom of the upper body 10 (see FIG. 5).

The lower body 20 is a structural part in which two walls are formed on the bottom plate, and horizontal flanges 21 are formed at the top of both walls, and both flanges 21 are bolted to the lower surface of the upper body 10. It is mounted with B) and nut (N). The base member 30 is inserted between the upper body 10 and the lower body 20, and a movement passage through which the base member 30 can move back and forth is formed.

A pole 40 is installed on one side of the upper surface of the bottom plate of the lower body 20 in a rotatable state via a first mounting pin 81.

In addition, linear bearings 60 are provided on the inside walls of both sides of the lower body 20 to enable smooth forward and backward movement of the base member 30.

The base member 30 is a rectangular plate-shaped part that is inserted into the moving passage between the upper body 10 and the lower body 20 and moves back and forth, and the base member 30 accommodates the pole 40 to form a pole. A pole operating hole (32) is formed that provides an operating space for (40).

The pole operation hole 32 limits the forward and backward movement range of the base member 30 with respect to the pole 40, whose position is fixed, to within the range of the pole operation hole 32, thereby limiting the forward and backward movement position of the headrest. Additionally, the pawl operating hole 32 serves to guide the rotation of the pawl 40 when it returns to the front gear groove (0th stage position).

A latch gear 33 composed of a plurality of gear teeth is formed on one side of the pawl operating hole 32 (the side on which the release plate 50 is installed).

In the illustrated embodiment, the latch gear 33 includes a total of three gear teeth, and a total of four gear grooves into which the pawl 40 is hung are formed (three grooves formed behind the gear teeth and in front of the frontmost gear). 1 groove). Therefore, since there are four positions where the pole 40 is hung, the position of the headrest can be fixed at a total of four points: 0th stage, 1st stage, 2nd stage, and 3rd stage.

The 0th stage position is the position where the headrest is pushed to the rearmost position, and the 3rd stage position is the most forward position where the headrest can be fixed.

The reference position is when the headrest is pushed to the rearmost position, and at this time, the pawl 40 is inserted into the frontmost gear groove (position 0). In that state, when the rider pulls the headrest forward, the pawl (40) moves backwards from the 0th gear groove to the 1st gear groove, 2nd gear groove, and 3rd gear groove in order, and is caught in the corresponding gear groove. The headrest can be fixed in position.

The pawl 40 is selectively engaged with any one of the latch gears 33 (the pawl 40 is inserted into the gear groove immediately behind the gear tooth to support the gear tooth against the restoring force of the return spring 70). It is a part that fixes the headrest in the selected position. The pole 40 is rotatably installed on the bottom plate of the lower body 20 using the first mounting pin 81. Therefore, when the base member 30 moves back and forth, it moves together with the base member 30 and can be separated from the latch gear 33 or caught again.

In addition, the pole 40 is connected to the bottom plate of the lower body 20 via the first position change spring 91 (see FIG. 7) and has an engaging (meshing) position where it is engaged with the latch gear 33 and the latch gear. It can be separated from (33) and switched to the release position to maintain the release state. The 'position change spring' is an arc-shaped spring that connects a fixed part and a movable part and is used to switch the position of the movable part relative to the fixed part between two positions and maintain the switched position.

The release plate 50 is rotatably installed on the upper surface of the base member 30 using a second mounting pin 82. A first locking protrusion 51 on which the pawl 40 is hung is formed on one side of the outer surface of the release plate 50 toward the latch gear 33 (see FIG. 6). The pole 40 is formed with a thickness that is the sum of the thickness of the portion around the pole operating hole 32 of the base member 30 and the thickness of the release plate 50, and acts as the first obstacle between the latch gear 33 and the release plate 50. It is designed so that it can be hung together with the flag (51).

Additionally, a second locking protrusion 52 is formed on the release plate 50 at a predetermined distance rearward from the first locking protrusion 51 (see FIG. 6). The second locking protrusion 52 is the pole operating hole 32 when the pole 40 pushes the first locking protrusion 51 to rotate the release plate 50 counterclockwise around the second mounting pin 82. ) It protrudes into the inner area, and the pole 40 can be switched to the release state at that position. A locking protrusion 41 is formed on one side of the outer peripheral surface of the pole 40 in response to the second locking protrusion 52 of the release plate 50 (see FIG. 6). When the headrest is pulled to the forefront by the occupant, the second locking protrusion 52 pushes the locking protrusion 41, thereby rotating the pawl 40 from the locking (engaging) position to the release position.

Additionally, a third locking protrusion 53 is formed on the release plate 50 (see FIG. 6). The third locking protrusion 53 is formed on the outer peripheral surface opposite to the portion where the first locking protrusion 51 and the second locking protrusion 52 are formed. The third locking protrusion 53 is operated by being caught by the manipulation protrusion 13 formed on the lower surface of the upper body 10. When the headrest returns from the frontmost position to the reference position, the third locking protrusion 53 is operated. As the release plate 50 is caught by the protrusion 13 and rotated clockwise, the release plate 50 is switched from the release position to the operation standby position. That is, the second locking protrusion 52 of the release plate 50 returns from the inner area of the pole operation hole 32 to the outer area.

Additionally, a stopper groove 54 is formed on one side of the outer peripheral surface of the release plate 50, and a stopper pin 83 is installed inside the stopper groove 54. The stopper pin 83 is fixed to the base member 30. Therefore, the stopper pin 83 is caught on both walls in the rotational direction of the stopper groove 54 according to the rotation direction of the release plate 50, thereby limiting the amount of rotation of the release plate 50.

Additionally, the release plate 50 is connected to the base member 30 via the second position change spring 92 (see FIG. 6). Therefore, the second locking protrusion 52 can switch and maintain its position between the operation standby position located outside the pole operation hole 32 and the release position located inside the pole operation hole 32.

The bearings 60 are installed inside the walls on both sides of the lower body 20. The bearing 60 is a straight retainer equipped with a plurality of steel balls 61 in the longitudinal direction. The steel balls 61 are in rolling contact with both sides of the base member 30, so that the base member 30 moves smoothly in the front-to-back direction. You can move. Straight guide grooves 34 into which the steel ball 61 is partially inserted and seated may be formed on both end surfaces of the base member 30.

The return spring 70 is a component that moves the headrest to the reference position. The return spring 70 is disposed on the upper part of the upper body 10, and as described above, one end is hung on the first hook 12 formed on the upper body 10, and the other end is attached to the headrest mounting part 31. It is hung on the formed second hook (35). Therefore, the return spring 70 increases as the base member 30 moves forward, thereby always generating a return force that moves the base member 30 to the reference position.

The second hook 35 is a horizontal bar-shaped portion formed on the headrest mounting portion 31, and through holes are formed in the upper and lower portions of the second hook 35, so that the ring at the end of the return spring 70 is connected to the second hook. It is designed to be hung at (35).

Now, the operation of the headrest front/back position adjusting device according to the present invention will be described.

Figure 6 shows the headrest in a reference position (= a position pushed to the rearmost position) and the headrest mounting portion 31 is as close as possible to the lower body 20. In this state, the pawl 40 is inserted into the frontmost gear groove (0th position) of the latch gear 33.

At this time, the release plate 50 is in a standby state for operation, the first locking protrusion 51 is located rearward than the third gear (rearmost gear) of the latch gear 33, and the second locking protrusion 52 is in a pawl operation state. It is located in the outer area of the hole 32. This operation standby state is maintained by the second position change spring 92, and at this time, the stopper pin 83 touches the lower side of the stopper groove 83, so the operation standby position is always constant.

At the headrest reference position described above, the passenger (seated on the seat) can adjust the position by pulling the headrest forward. Since the headrest is installed in the headrest mounting portion 31, when the occupant pulls the headrest, the entire base member 30 moves forward.

As the base member 30 moves forward, the pawl 40 is pushed up along the slope of the gear tooth, thereby releasing the meshing state between the pawl 40 and the latch gear 33, and releasing the hand from the headrest at a randomly selected position. When released, the pole 40 is rotated toward the latch gear 33 by the first position change spring 91, and the base member 30 moves rearward by the return spring 70, so that the pole 40 moves to the selected position. The position of the headrest is fixed by being hooked to the rear of the gear. In this way, the position of the headrest can be adjusted in the order 0 → 1st → 2nd → 3rd.

On the other hand, when trying to adjust the position of the headrest from a relatively high stage to a low stage, the pole cannot be moved directly from the high stage to the low stage, and the pole must be moved after the rearmost fixed stage (third stage in the illustrated embodiment). This is possible by returning the pole 40 to the 0 position through the release process of 40) and then pulling the headrest again to select the desired level.

Figure 7 shows the initial point in time when the pole 40 begins to engage in the third position. The end of the pole (40) is caught on the first locking protrusion (51) of the base plate (50), but the first locking protrusion (51) has not yet been pushed, and the second locking protrusion (52) is still in the pole operating hole ( 32) It is located in the outer region.

In the above state, when the base member 30 moves rearward due to the return force of the return spring 70, the first locking protrusion 51 is caught on the pole 40, so that the release plate 50 rotates counterclockwise and the pole (40) is seated in the third gear groove of the latch gear (33).

At this time, as shown in Figure 8, the second locking protrusion 52 of the release plate 50 protrudes into the inner area of the pole operation hole 32 and faces the locking protrusion 41 of the pole 40 (release plate ( 50) release position). The release plate 50 rotates until the stopper pin 83 touches the upper side of the stopper groove 54, and this state is maintained by the second position change spring 92.

When the headrest is pulled to the frontmost position as shown in FIG. 9 in any fixed position including the three-stage fixed position as described above, the base member 30 moves forward and the second locking protrusion 52 of the release plate 50 ) pushes the locking step 41, thereby rotating the pole 40 clockwise. Accordingly, the engagement state of the pawl 40 with the latch gear 33 is released, and the pawl 40 is switched to a released state in contact with the opposite side of the pawl operating hole 32. The release position of the pole 40 is maintained by the first position change spring 91.

In the state of FIG. 9 as described above, when the passenger releases his/her hand from the headrest, the base member 30 is moved to the rearmost position by the return spring 70, and the pole 40 moves to the front of the pole operating hole 32. It moves to , and is rotated counterclockwise again by the round shape of the front inner surface of the pawl operating hole (32) and inserted into the 0th position of the latch gear (33).

Also, at this time, the third locking protrusion 53 of the release plate 50 is caught by the operating protrusion 13 of the upper body 10, so that the release plate 50 is rotated clockwise to the operation standby position as shown in FIG. 6. converted.

As described above, the device for adjusting the front and rear position of the headrest according to the present invention can adjust the position of the headrest to the position desired by the occupant by repeating the process of FIGS. 6 to 9.

When applying the headrest anteroposterior position adjustment device according to the present invention, the parts for adjusting the anteroposterior position of the headrest are all installed in the horizontal portions of the upper body 10, the lower body 20, and the base member 30, and the headrest The rest is installed on the headrest mounting portion 31, which is a vertical portion of the base member 30. Therefore, there is no need to install mechanisms for adjusting the front and rear positions inside the headrest, which is very advantageous in making the headrest slim.

In addition, in the device for adjusting the front and rear position of the headrest according to the present invention, the latch gear 33 is formed on the horizontal part of the base member 30, and the pole 40 is also installed on the lower body 20, which is a horizontal plate, so that it can be moved on the horizontal plane. It is designed to operate in rotation. Therefore, even if a very strong downward impact occurs while the vehicle is running, the impact direction and the operating direction of the pole 40 are different, so the pole 40 cannot be separated from the latch gear 33, so the position of the headrest selected by the occupant is very It can be maintained stably.

In addition, the device for adjusting the front and rear position of the headrest according to the present invention, even if a collision accident occurs while driving and the headrest is moved to the frontmost position due to inertia, except for the case where the headrest is at the rearmost fixed end (3rd position) Pole 40 does not fully transition to the released state. In the 0th, 1st, and 2nd stage fixed states, the release plate 50 is in a standby state (not in the release position), so the second locking protrusion 52 does not protrude into the inner area of the pole operation hole 32. Therefore, even if the base member 30 moves to the forefront due to inertia during a collision, the pole 40 cannot be converted to the release state.

Therefore, when the headrest is in the 0th, 1st, or 2nd position, the headrest does not move to the frontmost position and then to the rearmost position, but moves to the 3rd position and is fixed, so that the occupants who moved forward due to inertia are affected. When the upper body moves rearward after hitting the dashboard, the headrest can quickly support the occupant's head more forward, thereby alleviating the severity of the occupant's cervical spine injury.

As described above, the device for adjusting the front and rear position of the headrest according to the present invention is advantageous in slimming the headrest, prevents release of the pole when a downward impact occurs during driving, improves the position maintenance performance of the headrest, and improves the position maintenance performance of the headrest in the event of a collision accident. The head can be supported more forward, which can lessen the severity of the injury.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is merely illustrative, and various modifications and equivalent other embodiments are possible based on common knowledge in the field to which the technology pertains. You must understand. Therefore, the true technical protection scope of the present invention is based on the claims described below and should be determined based on the specific details of the invention described above.

The present invention relates to a device for adjusting the front and rear position of the headrest of an automobile, and can be used in industrial fields related to the headrest of automobile seats.

10: Upper body 11: Stay rod mounting part
12: first hook 13: operating projection
20: Lower body 21: Flange
30: Base member 31: Headrest mounting portion
32: Pole operating hole 33: Latch gear
34: Guide groove 35: Second hook
40: Pole 41: Stopper
50: Release plate 51: First locking protrusion
52: 2nd locking protrusion 53: 3rd locking protrusion
54: stopper groove 60: bearing
61: steel ball 70: return spring
81: 1st mount pin 82: 2nd mount pin
83: Stopper pin 91: First position change spring
92: Second position change spring

Claims (10)

An upper body mounted horizontally on the top of the stay rod;
a lower body mounted on the lower surface of the upper body;
a base member that is movably inserted and installed between the upper body and the lower body, has a headrest mounting portion on which a headrest is mounted at the front end, and has a pawl operating hole formed on one side with a latch gear formed therethrough;
a pawl rotatably installed on the lower body through the pawl operating hole and selectively engaged with one of a plurality of gear teeth of the latch gear;
a release plate rotatably installed on the base member and rotating the pawl to a release position when the base member moves to the forefront;
a return spring connected between the upper body and the headrest mounting portion to always apply a restoring force to move the base member rearward;
A device for adjusting the front and back position of the headrest of a car, including a device. In claim 1,
Flanges formed at the top of both walls of the lower body are bolted to the lower surface of the upper body, stay rod mounting portions concave downward are formed at both ends of the upper body, and the stay rod mounting portion has an upper horizontal portion of the stay rod. A device for adjusting the front and rear position of the headrest of an automobile, characterized in that it is mounted and welded. In claim 1,
Bearings are installed on both walls of the lower body, the bearings are equipped with a plurality of steel balls in the longitudinal direction on a straight retainer, and guide grooves into which some of the steel balls are inserted and seated are formed on both sides of the base member. Features a device for adjusting the front and rear headrest positions of a car. In claim 1,
The release plate is rotatably installed on the base member via a second mounting pin, and on one side of the outer surface of the release plate, a pawl is located behind the rearmost gear of the latch gear in the operation standby position, and the pawl is engaged with the rearmost gear. A first locking protrusion is formed that is pushed by the pawl and rotates the release plate from the operation standby position to the release position,
On the other side of the outer surface of the release plate, a second locking protrusion is formed that is located in the outer area of the pole operation hole when the release plate is in the operation standby position and protrudes into the inner region of the pole operation hole when the release plate is rotated to the release position. A device for adjusting the front and back position of the headrest of a car, characterized in that. In claim 4,
A locking protrusion on which the second locking protrusion is caught is formed on one side of the pole, and when the base member moves from the position engaged with the rearmost gear tooth to the front, the locking protrusion is caught by the second locking protrusion and the pole rotates to the release position. A device for adjusting the front and back position of the headrest of an automobile, characterized in that it is possible. In claim 5,
When the base member is moved to the rearmost position by the return spring when the pawl is in the release position, the pawl is guided to the inner surface of the pawl operating hole and inserted into the front gear groove of the latch gear. Headrest front and rear position adjuster. In claim 4,
A stopper groove is formed on another side of the outer surface of the release plate, and a stopper pin fixed to the base member is provided on the inside of the stopper groove, and the stopper pin abuts the lower and upper surfaces of the stopper groove. A device for adjusting the front and rear position of the headrest of a vehicle, characterized in that the operation standby position and the release position of the release plate are accurately limited. In claim 4,
A third locking protrusion is formed on another side of the outer surface of the release plate, and a manipulation protrusion is formed on the lower surface of the upper body in response to the third locking protrusion. With the release plate in the release position, the base member is positioned at the forefront. When moving from to the rearmost position, the third locking protrusion is caught by the operating protrusion so that the release plate is rotated to the operation standby position. In claim 1,
A device for adjusting the front and rear position of the headrest of a vehicle, characterized in that a first position change spring is installed between the pawl and the lower body to assist the pawl in changing the position between the engaging position and the release position and to maintain the changed position. In claim 1,
A second position change spring is installed between the release plate and the base member to assist the release plate in changing its position between the operation standby position and the release position and to maintain the changed position. regulating device.