JP5313492B2 - Vertical headrest device - Google Patents

Description

  The present invention relates to a headrest device that is attached to an upper part of a seat back of a vehicle seat, and particularly relates to a tiltable headrest device that can be tilted.

  The headrest device attached to the upper part of the seat back, which is the backrest of the vehicle seat, protects the head and neck of the seat occupant, especially the impact that occurs on the head and neck during a rear-end collision received from the following vehicle. It is to ease.

  In order to cope with the occurrence of whiplash caused by a rear-end collision, various improvements have been made to the headrest device. For example, when a rear-end collision is received, an active headrest device (see Patent Document 1) that supports the head of the passenger by moving the headrest forward by pressure from the passenger sinking into the seat back, or predicting or detecting a vehicle collision When this is done, a pre-crash-compatible headrest device (see Patent Document 2) that increases the restraint on the head of the occupant is disclosed.

  However, when there is no occupant seated in such a headrest device, it is an obstacle that obstructs the front view of the person seated in the rear seat. There is a demand for securing a front view of a passenger in a rear seat particularly in a narrow space.

In response to such a demand, an electric headrest device for a vehicle is disclosed in which the support stay of the headrest can be raised and lowered (see Patent Document 3).
JP 2005-104259 A JP 2006-27593 A Japanese Patent Publication No. 6-20852

  The headrest device disclosed in Patent Literature 3 supports a headrest stay from below with a resin piece, moves the resin piece up and down in the rail, and further slides and rotates the upper rest of the rail to rotate the headrest. Defeat forward.

  For this reason, sliding rotation is suddenly performed due to the weight of the headrest, and there is a possibility that the raising / lowering operation of the headrest also becomes rapid. Therefore, damage and wear of the apparatus are likely to occur due to repeated use.

  An object of the present invention is to provide an electric tiltable headrest device that can suppress a sudden tilting motion and can perform a stable tilting motion.

  The present invention achieves stable headrest tilting without a sudden tilting motion by devising that the headrest tilting motion is linked to the vertical motion converted from the driving device. .

  That is, in order to achieve the above object, the present invention proposes a tiltable headrest device provided at the upper part of a seat back of a vehicle seat, which is operated by supporting a headrest having an outer skin and a cushion. A support member; a headrest actuating unit that attaches one end of the headrest support member to move the headrest support member up and down; and a drive unit that drives the headrest actuating unit. And a conversion unit that converts the rotary motion transmitted from the driving means into a vertical motion, and a interlocking unit that interlocks the headrest support member with the vertical movement and tilting motion by the converted vertical motion. This is an inverted headrest device.

  As described above, the headrest actuating means causes the headrest support member to move up and down and move up and down in conjunction with the converted up and down motion, so that it is possible to prevent the headrest from being suddenly up and down. Therefore, the headrest can be used upside down stably, and the vehicle seat including the headrest device can be prevented from being damaged.

  The interlocking unit includes a first rotation shaft and a second rotation shaft connected to the first rotation shaft by a connecting member, and the first rotation shaft and the second rotation shaft. The rotation shaft moves the headrest support member up and down by moving up and down along the guide grooves provided by the up and down movement converted by the conversion unit, and further, at the upper end position of the up and down movement, the first shaft The movement of the rotation shaft is restricted, and the headrest support member is raised by rotating the second rotation shaft along the guide groove about the upper end position of the first rotation shaft. Can be overturned.

  Furthermore, by rotating along the guide groove, it is possible to suppress a sudden up / down operation of the headrest.

  Further, the first guide groove on which the first rotation shaft moves and the second guide groove on which the second rotation shaft moves have parallel straight vertical grooves each having the same length. In addition, since only the second guide groove is provided with an arcuate guide groove centered on the upper end of the first guide groove, the second rotation shaft is used as the first rotation shaft. The headrest supporting member can be moved up and down by rotating along the guide groove centered on the head.

  The interlocking unit further includes a position restricting elastic member for holding the position where the movement of the first rotation shaft is restricted, so that the first rotation shaft is restricted by its own weight, for example. Further lowering can be suppressed.

  As such a position regulating elastic member, a linear elastic member or a resinous elastic member can be used. For example, a locking member made of a wire or a resinous elastic member may be fitted to the first rotation shaft so as to be pivotable.

  According to the present invention, the headrest raising / lowering operation is interlocked with the vertical movement converted from the rotation device of the driving device, so that the sudden raising / lowering operation of the headrest can be suppressed. Therefore, it is possible to provide a tiltable headrest that ensures stable operation.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1A is a front perspective view of the structure of the headrest device, and FIG. 1B is a rear perspective view of the inner structure of the headrest device.

  As shown in FIGS. 1A and 1B, a headrest device according to the present invention includes a headrest 13 provided on an upper portion of a back seat 12 of a vehicle seat, and a headrest support member that supports and operates the headrest 13. A headrest stay 15, a headrest actuating device 16 that is a headrest actuating means that moves the headrest stay 15 up and down, and a drive unit motor ASSY (assembly) 17 that drives the headrest actuating device 16. It is.

  A seat back 12, which is a backrest portion of a vehicle seat, has a skin, a cushion (both not shown), and a main frame 18 inside thereof. The main frame 18 is a substantially rectangular structure, and has a horizontally long lower frame 21, an upper pipe 22 that is a U-shaped pipe member with both ends facing downward, and both ends of the lower frame 21 and the upper pipe 22. And side frames 23a and 23b located on the left and right sides.

  The headrest 13 protects the occupant's head and neck, has a substantially rectangular parallelepiped shape, and has a skin and cushion (only the outer edge is shown), and a headrest stay 15 that supports the headrest 13 and operates the headrest 13. It will be.

  The headrest stay 15 is made of a U-shaped pipe member, and is bent slightly toward the vehicle seat in the middle of the legs on both sides. The headrest stay 15 extends from the headrest 13 from the middle to the end of the legs on both sides, and the others are positioned inside the headrest 13. Both ends of the legs of the headrest stay 15 are inserted into headrest guide brackets 26a and 26b located on both sides of a headrest actuating device 16 described later. The headrest stay 15 is inserted and attached so that the headrest stay 15 is positioned in front of the upper pipe 22 so that the headrest stay 15 can be raised and lowered in front of the vehicle seat.

  The headrest actuating device 16 has an upper part attached to the upper pipe 22 and an upper part of the two upper and lower crosspiece members 27a and 27b passed to the side frames 23a and 23b. 27a is attached. The motor ASSY 17 is fixed to a motor attachment member 28 attached to the upper horizontal cross member 27a and the lower horizontal cross member 27.

  The headrest actuating device 16 has a vertically long rectangular parallelepiped shape, and headrest guide brackets 26a and 26b are attached to both sides of the headrest guide brackets 26a and 26b. Further, as shown in FIG. 1 (a), the headrest actuating device 16 is provided on a front bracket on the front side of the vehicle seat and a guide bracket 31 composed of a trihedral body on the left and right sides, and on the lower front part on the back side shown in FIG. 1 (b). The lead bracket 32 is positioned, and a shaft 33 that receives the rotational motion of the motor ASSY 17 and rotates orthogonal to the motor rotation axis.

  Next, the structure of the headrest operating device will be described with reference to FIG. FIG. 2 is an exploded perspective view of the headrest operating device as viewed from the back side of the seat back 12.

  As shown in FIG. 2, the headrest actuating device 16 is attached to a main frame 18 that is an internal structure of the seat back 12. A motor ASSY 17 as a driving means for driving the headrest actuating device 16 is also fixed to a motor mounting member 28 provided between the upper horizontal rail 27a and the lower horizontal rail 27b of the main frame 18.

  The headrest actuating device 16 has a gear device 35 that transmits the rotation of the motor ASSY 17 to a shaft 33 that rotates perpendicularly to the rotation axis of the motor ASSY 17, and a shaft support member 36 that rotatably attaches the shaft to the upper pipe 22. doing. The headrest actuating device 16 includes a nut ASSY 37 that moves up and down in response to the rotation of the shaft 33, a lead bracket 32 that is a U-shaped plate member with the nut ASSY 37 attached to the inside thereof, and the left and right sides of the lead bracket 32. Headrest guide brackets 26a and 26b provided on both sides, pins 41a and 42a attached to the headrest guide bracket 26a, pins 41b and 42b attached to the headrest guide bracket 26b, and pins 41a, 41b and 42a And a connecting bracket 45 for connecting the pin 42b. By the connection by the connection bracket 45, the pin 41a and the pin 41b constitute the pin A46 which is the first rotation shaft (the pin 41a and the pin 41b are coaxial through the connection bracket 45), and the pin 42a And the pin 42b constitute a pin B47 which is the second rotation shaft (the pin 42a and the pin 42b are coaxial with the connection bracket 45). The pins A46 and B47 are also connected by the connecting bracket 45.

  The pin A46 and the pin B47 have a connecting bracket 45 in the middle, and both ends are inserted into guide grooves 51a, 51b, 52a, 52b respectively formed on the left and right side surfaces of the guide bracket 31, and the headrest guide bracket 26a. 26b are attached. The guide grooves 51a and 51b through which the pin A46 is inserted are provided with a wire stopper spring 55 which is a position restricting elastic member. A guide groove 51a into which the pin A is inserted and a guide groove 52a into which the pin B is inserted are formed on the left side surface (viewed from the back side of the vehicle seat) of the guide bracket 31, respectively. A guide groove 51b into which the pin A is inserted and a guide groove 52b into which the pin B47 is inserted are formed on the side (viewed from the side).

  The guide groove 51 (51a, 51b) is a linear oblique upper and lower groove, and the guide groove 52 (51a, 52b) is a linear oblique groove that is parallel to and substantially equal in length to the guide groove 51 (51a, 51b). An arc-shaped groove is additionally formed in the vertical groove. This arc-shaped groove formed in the guide groove 52 (51a, 52b) is an arc centered on the upper end position of the guide groove 51 (51a, 51b). The stopper spring 55 is engaged with the guide groove 51 (51a, 51b), and the pin A46 is held at the upper end position when the pin A46 reaches the upper end position of the guide groove 51 (51a, 51b). It is designed to be locked.

  The gear device 35 and the shaft 33 constitute a conversion portion, and the nut assembly 37, the lead bracket 32, the connection bracket 45, the pin A46 and the pin B47, and the headrest guide brackets 26a and 26b constitute an interlocking portion. .

  Next, the vertical movement of the headrest 13 will be described with reference to FIG. 3A is a side view when the headrest 13 is at the lower end position (left side view as viewed from the rear side of the vehicle seat), and FIG. 3B is a side view when the headrest 13 is at the upper end position (the rear side of the vehicle seat). Left side view viewed from the side).

  As shown in FIG. 3A, the pin A46 is located at the lowermost end of the guide groove 51a, and the pin B47 is located at the lowermost end of the guide groove 52a. The pin A46 and the pin B47 are connected by the connection bracket 45 as described above (the connection bracket 45 does not appear in FIGS. 3A and 3B), and the pin B47 is an opening formed in the lead bracket 32. It is engaged with the hole. As a result, the pin B47 and the pin A46 can move up and down as the lead bracket 32 moves up and down. That is, as shown in FIG. 2, the rotational movement of the motor ASSY 17 is caused to rotate the shaft 33 by the gear device 35, which leads to the vertical movement of the lead bracket 32 incorporating the nut ASSY 37 meshing with the shaft 33. It has become.

  As shown in FIG. 3B, as the lead bracket 32 moves upward, the pin B47 is obliquely upward along the guide groove 52a of the guide bracket 31 and the pin A46 is obliquely upward along the guide groove 51a of the guide bracket 31. Ascending in parallel toward each other. At this time, since the end portions of the headrest stay 15 are inserted into the headrest guide brackets 26a and 26b attached to both ends of the pin A46 and the pin B47, the headrest 13 supported by the headrest stay 15 rises. When the headrest 13 is at the uppermost end position, the pin A46 is positioned at the uppermost end of the guide groove 51 (51a, 51b). At this time, the pin A46 is brought into contact with the bent portion of the stopper spring 55, Locked by receiving elastic force.

  Next, the raising / lowering operation | movement of the headrest 13 is demonstrated with reference to FIG. 4A and 4B are explanatory views of the headrest tilting operation. FIG. 4A is a side view of the headrest standing upright (left side view as viewed from the rear side of the vehicle seat), and FIG. 4B is a side view of the headrest tilted up. (Left side view viewed from the rear side of the vehicle seat), (c) is an enlarged view showing the positional relationship between the pin A that is the first rotation axis and the pin B that is the second rotation axis. Since the right side is the same, the following description will be given in a state viewed from the left side.

  As shown in FIG. 4A, the pin A46 is locked by receiving the elastic force from the stopper spring 55 at the upper end position of the guide groove 51a.

  Then, as shown in FIG. 4 (b), as the lead bracket 32 moves upward, the pin B47 moves circularly around the pin A46 that is locked and does not move in the arc-shaped groove positioned above the guide groove 52a. Rotating motion that is a part of By the rotational movement of the pin B47, the headrest stay 15 and the headrest 13 inserted into the headrest guide brackets 26a and 26b are inverted. Here, the rotational movement of the pin B47 is performed in conjunction with the upward movement of the lead bracket 32, so that the headrest 13 is not suddenly turned over.

  When the pin B47 reaches the position shown in FIG. 4C, the inversion of the headrest 13 is completed. At this time, the upward movement of the lead bracket 32 also stops. In FIG. 4 (c), the pin A 46 is locked by receiving an elastic force at the bent portion of the stopper spring 55.

  From the inverted state of the headrest 13 to the standing state, the reverse operation is performed, and the pin B47 performs a circular motion that is a circular motion along the arc-shaped groove with the pin A46 being locked as a center. When the rotational movement of the pin B47 is completed, the headrest 13 is in the position shown in FIG.

  As the lead bracket 32 is further moved downward, the pin B47 is lowered along the straight portion of the guide groove 52a, and the pin A46 is released from the engagement with the stopper spring 55 and is lowered along the guide groove 51a. As a result, the headrest 13 moves downward.

  FIGS. 5A and 5B are views showing another embodiment of the position restricting elastic member for restricting the movement of the pin A which is the first rotating shaft, wherein FIG. 5A is an overall view and FIG. 5B is a partially enlarged view. As shown in FIG. 5, a stopper member 61 made of resin is provided at the upper end of the guide groove 51a in place of the stopper spring 55 which is a wire such as a wire. The stopper member 61 has a recess into which the pin A46 is inserted, and holds the position by pressing the pin A46 inserted by the elastic force of the resin. As a result, when the pin B47 moves along the arcuate portion of the guide groove 52a, the position of the pin A46 is maintained as its center. The pressing force is such that it is released when the pin A46 moves downward along with the downward movement of the pin B47. The stopper member 61 is not limited to resin as long as it has elasticity and can maintain the position of the center of rotation.

  FIG. 6 is a view showing an application example of the headrest device of the present invention. Since the cable wire 14 can be inserted from the lower end of the headrest stay 15 and introduced into the headrest 13, each mechanism 19 for activation and pre-crashing is installed in the headrest. 13 can be provided.

  FIG. 7 is a view showing another embodiment of the headrest device according to the present invention, wherein (a) is a rear perspective view of the internal structure of the headrest device, and (b) is a rear view of the internal structure of the headrest device. Components having the same functions as those of the above-described embodiment will be described using the same reference numerals.

  As shown in FIG. 7, the motor ASSY 17 and the headrest actuating device 16 are integrally attached to the driving device attaching member 63 (see FIG. 7B). As a result, the rotational motion of the motor ASSY 17 is smoothly transmitted to the headrest actuating device 16, and the headrest stay 15 is moved vertically and tilted smoothly.

  8 to 11 show the vertical movement and the overturning operation of the headrest 13 according to another embodiment of the headrest device.

  As shown in FIGS. 8A and 8B, the lead bracket 32 is at the lower end position, and the pins A46 and B47 are also at the lower end positions of the guide grooves 51a and 52a.

  As shown in FIGS. 9A and 9B, as the lead bracket 32 rises, the pin A46 and the pin B also move upward to reach the upper end position of the guide groove 51a and the upper end position of the linear portion of the guide groove 52a, respectively. 13 is also an upper end position. At this time, as shown in FIG. 9C, the pin A46 is locked by receiving an elastic force from the bent portion of the stopper spring 55, and is held in this position.

  As shown in FIGS. 10A and 10B, the pin A46 is locked at the upper end position, and the pin B47 moves along the arcuate portion of the guide groove 52a with the upper end position as the rotation center. As a result, the headrest stay 15 is inverted, and the headrest 13 is also inverted.

  As shown in FIGS. 11 (a) and 11 (b), the headrest stay 15 and the headrest 13 are completely inverted when the circular motion of the pin B47 is completed. It should be noted that the headrest 13 can be raised and lowered in the reverse order to return to the original lower end position.

(A) is the structure front perspective view of a headrest apparatus, (b) is an internal structure back perspective view of a headrest apparatus. The disassembled perspective view of a headrest actuator. It is explanatory drawing of the up-and-down operation | movement of a headrest, (a) is a side view in which a headrest is in a lower limit position, (b) is a side view in which a headrest is in an upper limit position. FIGS. 4A and 4B are explanatory diagrams of the headrest raising / lowering operation, in which FIG. 4A is a diagram in which the headrest is in an upright state, FIG. 4B is a diagram in which the headrest is in an inverted state, and FIG. It is an enlarged view which shows the positional relationship of the pin B which is 2 rotation axes. It is a figure which shows the other Example of the position control elastic member which controls the movement of the pin A which is a 1st rotation axis, (a) is a general view, (b) is a partial enlarged view. Sectional drawing which shows the application example of the headrest apparatus which concerns on this invention. It is a figure which shows other embodiment of the headrest apparatus which concerns on this invention, (a) is internal structure rear perspective view of a headrest apparatus, (b) is an internal structure back view of a headrest apparatus. It is operation | movement explanatory drawing of other embodiment of the headrest apparatus based on this invention, (a) is sectional drawing which makes a headrest support member a minimum position, (b) is the partially expanded sectional view. FIG. 6 is an explanatory view of the operation of another embodiment of the headrest device according to the present invention, in which (a) is a sectional view with the headrest supporting member at the upper limit position, (b) is a partially enlarged sectional view, and (c) is a stopper member. FIG. Similarly, it is operation | movement explanatory drawing of other embodiment of the headrest apparatus based on this invention, (a) is sectional drawing when it puts in the middle of the raising / lowering operation | movement of a headrest support member, (b) is the partially expanded sectional view. . Similarly, it is operation | movement explanatory drawing of other embodiment of the headrest apparatus based on this invention, (a) is sectional drawing when a headrest support member is inverted, (b) is the partially expanded sectional view.

Explanation of symbols

12 Seat back 13 Headrest 15 Headrest stay 17 Motor ASSY
26a, 26b Headrest guide bracket 31 Guide bracket 32 Lead bracket 33 Shaft 33
35 Gear unit 37 Nut ASSY
45 Connecting bracket 46 Pin A
47 pin B
51, 52 Guide groove

Claims (2)

A tiltable headrest device provided at the upper part of the seat back of the vehicle seat,
A headrest support member that supports and operates a headrest having an epidermis and a cushion;
A headrest actuating means for attaching one end of the headrest support member to move the headrest support member up and down and to tilt it;
Drive means for driving the headrest actuating means ;
With
The headrest support member has a pipe member extending linearly from the headrest,
The headrest actuating means, possess a conversion unit for changing the rotational motion transmitted from the driving means into vertical motion, and interlocking portion for interlocking the headrest support member up and down movement and raising倒動operation by the transformed vertical movement ,
The interlocking unit includes a first rotation shaft, a second rotation shaft connected to the first rotation shaft by a connecting member, and a headrest guide bracket to which the first and second rotation shafts are mounted. The headrest guide bracket is configured such that the first rotation shaft and the second rotation shaft are moved up and down along the guide grooves provided by the up and down movement converted by the conversion unit. The headrest support member with one end of the pipe member inserted into is moved up and down,
The first guide groove in which the first rotation shaft moves and the second guide groove in which the second rotation shaft moves have parallel straight vertical grooves each having the same length. Further, only the second guide groove further has an arcuate guide groove centered on the upper end position of the first guide groove,
The interlocking portion further restricts movement of the first rotation shaft at the upper end position of the first guide groove, and causes the second rotation shaft to move to the upper end position of the first rotation shaft. The headrest support member is moved up and down by rotating along the guide groove around the center,
The interlocking unit further includes a position restricting elastic member for holding a position where the movement of the first rotation shaft is restricted . 2. The tiltable headrest device according to claim 1 , wherein the position regulating elastic member is a linear elastic member or a resinous elastic member.

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