JP5287218B2 - Headrest - Google Patents

Description

  The present invention relates to a headrest, and more particularly, to a headrest composed of a main body case that forms a contour and a pad member that is assembled to the main body case.

As this type of headrest, for example, the headrest disclosed in Patent Document 1 is already known. This headrest is a type called an active headrest.For example, when a rear collision occurs in the vehicle, the lock mechanism is unlocked, and the link mechanism is activated when the lock is released. On the other hand, it has a structure that jumps out and catches the back of the occupant. As a result, it is possible to buffer an impact on the back of the occupant caused by a rear collision in the vehicle.
US Pat. No. 6,082,817

  However, in the above-described headrest, when the operation of returning the jumped-out headrest to the initial position is performed, the headrest itself, that is, the soft pad member covering the surface of the headrest must be grasped by hand and returned. Since it must be returned in this way, it is difficult to grasp the pad member, resulting in a problem that it is difficult to return the headrest.

  The present invention is intended to solve such a problem, and an object of the present invention is to provide a headrest that can be firmly gripped even if it is covered with a pad member.

The present invention is for achieving the above object, and is configured as follows. The invention according to claim 1 is a headrest composed of a main body case that forms an outline and a pad member that is assembled to the main body case in an enclosed manner, and the main body case has front and rear surfaces thereof. of is formed in shape swelling both sides along the vertical direction in the horizontal direction of the surface of at least either one side provided with a stay for mounting to the seat back, the main body case, through the link plate The first tension spring is attached to the base member fixed to the stay by the three-point link mechanism via the first tension spring, and when the rear collision does not occur in the vehicle. Locked to the state before jumping out of the base member through the lock mechanism against the force, and the link plate has a ratchet with a step When a rear collision occurs in the vehicle, the lock mechanism is unlocked, and the main body case protrudes from the base member by the biasing force of the first tension spring, and the main body case is in the middle of the main body case. A stopper is attached to the base member to prevent the main body case from being returned to the initial position before it jumps out due to a load from the rear head of the occupant. The projection is formed on the inner surface of the rear surface of the main body case so that it can be returned to the initial position before the main body case pops out. When restricted by the stopper, this restriction by the stopper is that the protrusion presses the stopper by pushing the outer surface of the rear surface of the main body case. Are overcome by turnover against the biasing force of the second tension spring stopper acts to itself.
According to this configuration, when the front and rear edges of the side surface of the headrest are gripped by hand, the gripped fingertips are shaped to correspond to the raised portion of the back cover. As a result, the gripping force from the fingertip can be firmly transmitted to the back cover via the raised portion, so that the headrest can be firmly gripped even if it is covered with the pad member. Moreover, according to this structure, the member (for example, string, tool, etc.) which cancels | releases the restriction | limiting of a stopper can be made into an unnecessary structure.

The invention according to claim 2 is the headrest according to claim 1, characterized in that the main body case is formed so that both sides in the left-right direction of the rear surface are raised along the vertical direction. To do.
According to this structure, a passenger | crew's back head can be received, without impairing cushioning properties.

The invention according to claim 3 is a headrest composed of a main body case that forms a contour and a pad member that is assembled to the main body case in a covering manner. of the front and rear surfaces, both sides in the lateral direction of the surface of at least either one side is formed in a thin shape, and comprises a stay for mounting to the seat back, the main body case, three-point link through the link plate It is assembled to the base member fixed to the stay by the mechanism via the first tension spring, and resists the urging force of the first tension spring at all times when a rear collision does not occur in the vehicle. Thus, the link plate is locked in a state before jumping out from the base member, and a ratchet having a step is formed on the link plate, and a rear collision occurs in the vehicle. Then, the lock mechanism is unlocked, and the main body case protrudes from the base member by the urging force of the first tension spring. A stopper is attached to the base member to engage the ratchet step by engaging the ratchet step with the load so that the main body case is returned to the initial position before jumping out, and the stopper is in a direction to engage with the ratchet step. It is urged via the second tension spring, and a projection is formed on the inner surface of the rear surface of the main body case, and the return to the initial position before the main body case jumps out is restricted by the stopper. At this time, the restriction by the stopper is that the protrusion is pressed against the stopper by pushing the outer surface of the rear surface of the main body case. Characterized in that it is eliminated by turnover against the biasing force of the second tension spring acting on itself.
According to this configuration, the same effect as that of the first aspect can be obtained.

According to a fourth aspect of the present invention, in the headrest according to the third aspect of the present invention, the pad member is formed so that both sides of the rear surface in the left-right direction are thin.
According to this structure, the same effect as that of the second aspect can be obtained.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
Example 1
First, Example 1 of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing the internal structure of the headrest according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing the normal state of the headrest in the assembled state of FIG. FIG. 3 is a vertical cross-sectional view schematically showing a state when the headrest is maximally popped out from the state of FIG. 2 due to the occurrence of a rear collision in the vehicle.

  4 is a cross-sectional view of the headrest in the state of FIG. FIG. 5 is a longitudinal sectional view schematically showing a state when the headrest receives a load from the state of FIG. 4 by the occupant's rear head. FIG. 6 is a longitudinal sectional view schematically showing a state where the stopper is unlocked from the state of FIG. FIG. 7 is a longitudinal sectional view schematically showing a state where the stopper is turned over by unlocking from the state of FIG.

  FIG. 8 is a cross-sectional view of the headrest in the state of FIG. FIG. 9 is a longitudinal sectional view schematically showing a state in which the biasing direction of the stopper is switched by the turnover from the state of FIG. FIG. 10 is a vertical cross-sectional view schematically showing a state where the step of the ratchet interferes with the hooking portion of the stopper during the returning operation of the headrest that has jumped out from the state of FIG. FIG. 11 is a longitudinal sectional view schematically showing a state in which the biasing direction of the stopper has started to be returned from the state of FIG.

  In FIG. 1 described above, in order to easily show the internal structure of the headrest 3, the cushion structure and the skin structure are omitted, and only the internal frame structure is shown. Further, in the following description, “up”, “down”, “front”, “back”, “left”, “right” refers to the directions of “up”, “down”, “front”, “rear”, “left”, “right” described in the above-described drawings. When up, down, front, back, left, right are shown. The same applies to the description of Example 2 described later.

  First, with reference to FIGS. 1-4, the structure of the headrest 3 which concerns on Example 1 of this invention is demonstrated. The headrest 3 covers the front surface of the base member 20, the pair of left and right stays 22 and 22 assembled so as to be integrated with the base member 20, and a seat cushion (not shown). A substantially cover-like support plate 24 capable of receiving the rear head of the passenger seated on the back, a back cover 26 covering the back side of the support plate 24 in a manner to accommodate the base member 20, and the support plate 24 and the back A pad member 28 (not shown in FIG. 1) assembled in a covering manner to the cover 26, and a cover member 28a (not shown in FIG. 1) for covering the surface of the pad member 28. Yes.

  With this configuration, the back cover 26, the pad member 28, and the cover member 28 a are integrated with the support plate 24. Therefore, in the following description, it is needless to say that the back cover 26, the pad member 28, and the cover member 28a are protruded integrally with the support plate 24 even if it is simply described as the support plate 24 protruding.

  Further, the support plate 24 and the back cover 26 are each integrally formed of a rigid synthetic resin. Moreover, the outline of the headrest 3 is formed by assembling the support plate 24 and the back cover 26. And what attached this support plate 24 and the back cover 26 is equivalent to the "main body case" as described in a claim.

  Of the constituent members of the headrest 3, the pair of left and right stays 22 and 22 will be described in detail. The pair of left and right stays 22 and 22 are each configured in a cylindrical shape. The headrest 3 can be assembled to the seat back by inserting both the stays 22 into a pair of left and right supports (both not shown) formed on the seat back. Further, among these stays 22, for example, a rod 36 is inserted into the right stay 22.

  At this time, the rod 36 is inserted into the right stay 22 with its upper end hooked on a release member K of the lock mechanism R described later. When a rear collision occurs in the vehicle, a rear collision detection means (for example, a well-known dorsal load detection mechanism provided inside the seat back) is activated, and the rod 36 is pushed up and the release member K is activated along with this operation. As a result, the lock mechanism R is unlocked.

  Further, among the constituent members of the headrest 3, the support plate 24 will be described in detail. It has been. The three-point link mechanism will be described in more detail. Both ends in the width direction on one end side (rear end side) of the link plate 30 are pivotally attached to the left and right sides of the upper side of the base member 20 via pins P1, respectively. Similarly, both ends in the width direction on the other end side (front end side) of the link plate 30 are pivotally attached to the left and right sides of the upper side of the support plate 24 via pins P2, respectively.

  In addition, long holes 20a are formed on the lower left and right sides of the base member 20 in a substantially vertical direction. And the connection pin 32 is being fixed to the back side of the support plate 24 so that the right and left may be bridged. At this time, the connecting pin 32 is fixed so as to be movable in the long hole 20 a formed in the base member 20. As described above, the three-point link mechanism is constituted by three points including the pin P1 on one end side of the link plate 30, the pin P2 on the other end side, and the connecting pin 32.

  In addition, a first tension spring (not shown) is hooked on the connecting pin 32 between the upper side of the base member 20. Thereby, the connecting pin 32 is urged toward the upper end side of the long hole 20a of the base member 20, that is, the support plate 24 is urged toward the front diagonally upper side with respect to the base member 20. It is in a state.

  When the rear collision does not occur in the vehicle, the connection pin 32 is locked so that the support plate 24 is integrated with the base member 20 (the support plate 24 is not protruding). (The state held at the lower end of the long hole 20a) (hereinafter, this state is referred to as “normal state of the headrest 3”, see FIG. 2). Further, as described above, when the lock mechanism R is unlocked from this locked state, the connecting pin 32 moves from the lower end of the elongated hole 20a toward the upper end by the biasing force of the first tension spring. .

  Then, as the link mechanism is activated along with this movement, the support plate 24 protrudes toward the back of the occupant from the base member 20 (hereinafter, this state is referred to as “the headrest 3 is protruded”). , See FIG. 3). This description corresponds to the “mechanical mechanism for projecting the case from the stay” described in the claims.

  A ratchet 40 is integrally formed in the width direction on the surface of the link plate 30 on the base member 20 side (the lower surface of the link plate 30). In the ratchet 40, two steps, for example, a first step 40a and a second step 40b are formed along the outer peripheral surface thereof. On the other hand, the base member 20 is pivotally attached with a stopper 50 that can be engaged with both the steps 40a and 40b. A second tension spring 52 is hooked between the rear end 50b of the stopper 50 and the lock mechanism R.

  At this time, the second tension spring 52 is latched at a position where the biasing direction of the stopper 50 can be switched. That is, the second tension spring 52 is latched so that the stopper 50 can be urged in the first rotational direction (in the direction of arrow A in FIG. 2) that engages both the steps 40 a and 40 b of the ratchet 40. Has been. Further, the second tension spring 52 reverses the stopper 50 biased in the first rotation direction, thereby causing the stopper 50 to move in the second rotation direction opposite to the first rotation direction (see FIG. In FIG. 2, it is latched so that it can also be urged in the direction of arrow B).

  The switching of these urging directions is performed by so-called turnover, which is performed when the rotation of the stopper 50 reaches a predetermined position. By latching the second tension spring 52 in this way, the biasing direction of the stopper 50 can be switched to either the first rotation direction or the second rotation direction.

  Further, the stopper 50 is formed with a hook portion 50c capable of interfering with the second step 40b of the ratchet 40. Thus, when the biasing direction of the stopper 50 is the second rotation direction, when the operation of returning the headrest 3 from the protruding state to the normal state is performed, the biasing direction of the stopper 50 is also rotated in the second rotation along with this operation. The direction is returned to the first rotation direction.

  Of the constituent members of the headrest 3, the back cover 26 will be described in detail. A protrusion 26a capable of pressing the rear end 50b of the stopper 50 is formed on the inner surface of the rear surface of the back cover 26. . When the stopper 50 is engaged with either one of the two steps 40a and 40b of the ratchet 40, the protrusion 26a changes the biasing direction of the stopper 50 in accordance with the pushing from the pushing portion 26d of the back cover 26. It is formed to be switchable. This will be described in detail later in the operation.

  Further, on the rear surface side of the back cover 26, swelled portions 26b whose left and right swells along the vertical direction are formed (see FIG. 4). This description corresponds to “the main body case is formed in a bulging shape along the vertical direction on both sides in the left-right direction of the rear surface” described in the claims. By forming the raised portion 26b in this way, the rigidity of the back cover 26 can be ensured.

  Further, on the rear surface side of the back cover 26, a recessed groove 26c is formed along the vertical direction from the both raised portions 26b to the center in the left-right direction. Further, on the rear surface side of the back cover 26, a flat push-in portion 26d is formed which is shaped to be sandwiched between the two concave grooves 26c. By forming both concave grooves 26c in this manner, the pushing portion 26d can be easily bent in the pushing direction (the front direction in FIG. 4). Further, since the pushing portion 26d is formed thin, when the pushing portion 26d is pushed and bent, it can be bent more easily.

  Next, with reference to FIGS. 1-3 and FIGS. 5-11, the effect | action of the headrest 3 which consists of an above-described structure is demonstrated. First, the pop-out operation of the headrest 3 will be described. In the normal state of the headrest 3 shown in FIG. 2, when a rear collision occurs in the vehicle, as described above, the lock mechanism R is unlocked, and the three-point link mechanism is actuated as the lock is released. The plate 24 jumps out toward the occupant's rear head side (the headrest 3 pops out). At this time, the tip 50a of the stopper 50 is moved along the outer peripheral surface of the ratchet 40 so as to look down the both steps 40a and 40b of the ratchet 40. Therefore, the protrusion of the support plate 24 is not restricted by the stopper 50 (see FIG. 3).

  Even when the support plate 24 is pushed back by a load from the occupant's rear head M after the support plate 24 has been popped out, the tip 50a of the stopper 50 and the second step 40b of the ratchet 40 are engaged, The support plate 24 is not returned to the initial position before jumping out (see FIG. 5). This is the same even when the support plate 24 is pushed back by a load from the occupant's rear head while the support plate 24 is protruding. That is, since the front end 50a of the stopper 50 and the first step 40a of the ratchet 40 are engaged, the support plate 24 is not returned to the initial position before jumping out.

  Next, the returning operation of the headrest 3 that has jumped out will be described. First, from the state shown in FIG. 3, the pushing operation is performed by bending the pushing portion 26d of the back cover 26 over the cover member 28a. Then, the protrusion 26a of the back cover 26 starts to press the rear end 50b of the stopper 50 (see FIG. 6). Along with this pressing, the protrusion 26a reverses the stopper 50 in the second rotation direction.

  Then, with this reversal, the stopper 50 is turned over, and the biasing direction of the stopper 50 is switched from the first rotation direction to the second rotation direction (see FIGS. 7 and 8). Thereby, the tip 50a of the stopper 50 is pressed against the stopper pressing portion 20b (see FIG. 1) formed on the base member 20. In this way, the engagement between the tip 50a of the stopper 50 and the second step 40b of the ratchet 40 can be held in a released state (see FIG. 9).

  If the headrest 3 is returned to the initial position before jumping out in this holding state, the second step 40b of the ratchet 40 begins to interfere with the hook 50c of the stopper 50 (see FIG. 10). Then, the second step 40b of the ratchet 40 reverses the stopper 50 again in the first rotation direction, and with this reverse, the stopper 50 is turned over again, and the stopper 50 The urging direction is returned from the second rotation direction to the first rotation direction (see FIG. 11).

  Thereby, the front-end | tip 50a of the stopper 50 is returned to the initial state pressed on the outer peripheral surface of the ratchet 40 (refer FIG. 2). In this way, the headrest 3 can be returned from the protruding state to the normal state. Further, along with this return, the biasing direction of the stopper 50 can also be returned.

  The headrest 3 according to the first embodiment of the present invention is configured as described above. According to this configuration, when the front and rear edges of the side surface of the headrest 3 are gripped by hand, the gripped fingertips are shaped to correspond to the raised portion 26 b of the back cover 26. As a result, the gripping force from the fingertip can be firmly transmitted to the back cover 26 via the raised portion 26b, so that the headrest 3 can be firmly gripped even if it is covered with the pad member 28. Therefore, the headrest 3 that has jumped out can be easily returned.

  Further, according to this configuration, the back cover 26 side of the support plate 24 and the back cover 26 is raised. Therefore, the passenger | crew's back head M can be received, without impairing cushioning properties.

  Further, according to this configuration, the protrusions 26a of the back cover 26 restrict the stopper 50 that restricts the headrest 3 from being returned to the initial position before the headrest 3 jumps out due to the load from the occupant's rear head M during the headrest 3 protrusion. Can be released. Therefore, a member (for example, a string, a tool, etc.) for releasing the restriction of the stopper 50 can be made unnecessary.

(Example 2)
Subsequently, Example 2 of the present invention will be described with reference to FIGS. FIG. 12 is a cross-sectional view of the headrest according to the second embodiment of the present invention, and corresponds to FIG. 4 described in the first embodiment. FIG. 13 is a diagram corresponding to FIG. 8 described in the first embodiment. As is apparent from these drawings, the second embodiment is an embodiment in which the pad member 28 side is devised rather than the back cover 26 side as compared with the first embodiment already described. Therefore, in the following description, members having the same or equivalent configuration as those described in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description is omitted.

  Also in the second embodiment, the headrest 103 is similar to the headrest 3 of the first embodiment described above in that the base member 20, the pair of left and right stays 22, 22, the support plate 24, the back cover 126, and the pad member 128. And a cover member 28a.

  Of the constituent members of the headrest 103, the back cover 126 will be described in detail. The protrusion 126a and the pushing portion 126d are formed on the inner surface of the rear surface side of the back cover 126 in the same manner as the protrusion 26a and the pushing portion 26d of the first embodiment. Are formed respectively. Therefore, in the headrest 103 of the second embodiment, similarly to the headrest 3 of the first embodiment described above, the pushing portion 126d of the back cover 126 is bent and the pushing operation is performed, so that the tip 50a of the stopper 50 and the ratchet 40 are The engagement with the second step 40b can be maintained in a released state.

  The pushing portion 126d is formed thin like the pushing portion 26d of the first embodiment described above. Therefore, when the pushing portion 126d is pushed and bent, it can be bent easily. Note that the raised portion 26b and the recessed groove 26c of the first embodiment described above are not formed on the rear surface side of the back cover 126.

  Of the constituent members of the headrest 103, the pad member 128 will be described in detail. The pad member 128 is formed so that both sides of the rear surface in the left-right direction are thin. That is, the pad member 128 has thin portions 128b on both sides of the rear surface in the left-right direction. In this way, the headrest 103 of the second embodiment is configured.

  The headrest 103 according to the second embodiment of the present invention is configured as described above. According to this configuration, when the front and rear edges of the side surface of the headrest 103 are gripped by hand, the gripped fingertips are shaped to correspond to the thin portion 128 b of the pad member 128. As a result, as with the headrest 3 of the first embodiment, the gripping force from the fingertip can be securely transmitted to the back cover 126, so that the headrest 103 can be firmly gripped even when covered with the pad member 128. . Therefore, the headrest 103 that has jumped out can be easily returned.

  Further, according to this configuration, the rear surface side of the front and rear surfaces of the pad member 128 is thin. Therefore, similarly to the headrest 3 of the first embodiment, the occupant's rear head M can be received without impairing the cushioning property.

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In the first and second embodiments, the case where the headrests 3 and 103 are of the type called active headrests similar to that of the prior art has been described. However, the present invention is not limited to this, and a type called an inactive headrest may be used. That is, the headrest may be simply movable up and down with respect to the seat back.

FIG. 1 is an exploded perspective view showing the internal structure of the headrest according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing the normal state of the headrest in the assembled state of FIG. FIG. 3 is a vertical cross-sectional view schematically showing a state when the headrest is maximally popped out from the state of FIG. 2 due to the occurrence of a rear collision in the vehicle. 4 is a cross-sectional view of the headrest in the state of FIG. FIG. 5 is a longitudinal sectional view schematically showing a state when the headrest receives a load from the state of FIG. 4 by the occupant's rear head. FIG. 6 is a longitudinal sectional view schematically showing a state where the stopper is unlocked from the state of FIG. FIG. 7 is a longitudinal sectional view schematically showing a state where the stopper is turned over by unlocking from the state of FIG. FIG. 8 is a cross-sectional view of the headrest in the state of FIG. FIG. 9 is a longitudinal sectional view schematically showing a state in which the biasing direction of the stopper is switched by the turnover from the state of FIG. FIG. 10 is a vertical cross-sectional view schematically showing a state where the step of the ratchet interferes with the hooking portion of the stopper during the returning operation of the headrest that has jumped out from the state of FIG. FIG. 11 is a longitudinal sectional view schematically showing a state in which the biasing direction of the stopper has started to be returned from the state of FIG. FIG. 12 is a cross-sectional view of the headrest according to the second embodiment of the present invention, and corresponds to FIG. 4 described in the first embodiment. FIG. 13 is a diagram corresponding to FIG. 8 described in the first embodiment.

Explanation of symbols

3 Headrest 22 Stay 24, 26 Body case (support plate, back cover)
26a Protrusion 28 Pad member 50 Stopper 103 Headrest

Claims (4)

A headrest composed of a main body case that forms an outline and a pad member that is assembled to the main body case in an enveloping manner,
The main body case is formed in a bulging shape along the vertical direction on both sides in the left-right direction of at least one of the front and rear surfaces .
It has a stay for assembling to the seat back,
The main body case is assembled to the base member fixed to the stay by the three-point link mechanism via the link plate via the first tension spring, and is always in a state where no rear collision occurs in the vehicle. Sometimes it is locked in the state before it jumps out of the base member through the lock mechanism against the biasing force of the first tension spring,
The link plate is formed with a ratchet having a step,
When a rear collision occurs in the vehicle, the lock mechanism is unlocked, and the main body case protrudes from the base member by the biasing force of the first tension spring.
Inside the main body case, the base member has a stopper that restricts the base member by engaging the ratchet step so that the main body case is returned to the initial position before it pops out due to the load from the back of the occupant during the main body case. Pivoted,
The stopper is biased via a second tension spring in a direction to engage with the ratchet step,
A protrusion is formed on the inner surface of the rear surface of the main body case,
When the stopper restricts the main body case from being returned to the initial position before jumping out, the restriction by this stopper is caused by the protrusion pressing against the stopper by pushing the outer surface of the rear surface of the main body case. A headrest which is eliminated by turning over against the biasing force of the second tension spring acting on the head. The headrest according to claim 1,
The body case is characterized in that both sides of the rear surface in the left-right direction are formed so as to rise along the up-down direction. A headrest composed of a main body case that forms an outline and a pad member that is assembled to the main body case in an enveloping manner,
The pad member is formed thin on both sides in the left-right direction of at least one of the front and rear surfaces thereof ,
It has a stay for assembling to the seat back,
The main body case is assembled to the base member fixed to the stay by the three-point link mechanism via the link plate via the first tension spring, and is always in a state where no rear collision occurs in the vehicle. Sometimes it is locked in the state before it jumps out of the base member through the lock mechanism against the biasing force of the first tension spring,
The link plate is formed with a ratchet having a step,
When a rear collision occurs in the vehicle, the lock mechanism is unlocked, and the main body case protrudes from the base member by the biasing force of the first tension spring.
Inside the main body case, the base member has a stopper that restricts the base member by engaging the ratchet step so that the main body case is returned to the initial position before it pops out due to the load from the back of the occupant during the main body case. Pivoted,
The stopper is biased via a second tension spring in a direction to engage with the ratchet step,
A protrusion is formed on the inner surface of the rear surface of the main body case,
When the stopper restricts the main body case from being returned to the initial position before jumping out, the restriction by this stopper is caused by the protrusion pressing against the stopper by pushing the outer surface of the rear surface of the main body case. A headrest which is eliminated by turning over against the biasing force of the second tension spring acting on the head. The headrest according to claim 3,
The pad member is a headrest characterized in that both sides of the rear surface in the left-right direction are formed thin.

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