JPS6320377Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a front-rear adjustable headrest device for a vehicle seat, and more particularly to a headrest device having a center of rotation within the seat bag.

Conventionally, this type of head restraint device has been disclosed in Japanese Patent Application Laid-open No. 18530/1985 filed by the applicant of the present invention. This is a structure in which a substantially wave-shaped stopper is fixed to the seatback frame, and a shaft which is horizontally mounted on the arm of the headrest is engaged with the stopper to adjust the seat back and forth. Therefore, a headrest with such a structure can be moved forward step by step by pulling the headrest forward, but when returning, that is, moving backward, the headrest must be lifted by hand and a force applied backwards.
It is moved backward one step at a time, and in order to move it all at once from the front end to the rear end, the headrest must be moved backward while being held up. As a result, the headrest had to be lifted in order to move it rearward, resulting in a problem that made operability extremely difficult.

SUMMARY OF THE INVENTION The present invention provides a headrest device that allows the headrest to be adjusted in the front and back positions with a simple structure, and allows the adjustment operation to be performed extremely easily with a single touch.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of the rear seat of a car equipped with the device of the present invention. In the figure, 1 indicates the entire rear seat, 2 is a seat cushion, and 3 is a seat back. A headrest device 4 is attached.

An example of this headrest device 4 will be described in detail with reference to FIGS.
1a, 11b are inserted through longitudinal long grooves 6a, 6b formed on the upper edge surface of the seat bag 3, and both ends of the shaft pins 13a, 13 are inserted into brackets 12a, 12b fixed to the frame 7 of the seat bag 3.
b is pivotally connected to be rotatable in the front-rear direction.
Both pieces 11a and 11b are provided in the middle part of this stay 11.
A bracket 14 connecting the two is horizontally mounted.
And between this bracket 14 and the upper frame 7' which is a fixed member in the seat bag 3 to which it corresponds,
Adjustment mechanisms 17, 22, 21 for adjusting the tilting of the head rest 5, and automatic return mechanisms 24, 5, 26 for automatically returning the head rest 5 rearward are provided.

That is, the above-described adjustment mechanisms 17, 22, and 21 are provided on the upper frame 7' side with an engagement member consisting of an arm 17 provided on the stay 11, and the arm 17 is moved forward by the forward rotation of the stay 11. An engaged member consisting of an engagement bracket 22 that is engaged in stages in only one direction, and the arm 17 is urged to rotate with respect to the engagement bracket 22 in the engagement direction and in the disengagement direction across the dead center. The automatic return mechanisms 24, 25, and 26 are provided on the front end side of the engagement bracket 22 to move the arm 17 in the disengagement direction at the forwardmost rotational position of the stay 11 to the dead center. The first guide to rotate beyond the
a guide portion 24; and a second guide portion 25 that guides the arm 17 at the rearmost rotational position of the stay 11 so as to rotate the arm 17 in the engagement direction beyond the dead center.
and a return spring 26 that is stretched between the stay 11 and the upper frame 7' and biases the stay 11 rearward.

To explain this specifically, a pair of raised bearing pieces 15a and 15b are provided approximately at the center of the bracket 14, which is suspended horizontally on the stay 11, and protrude toward the rear surface. A proximal end portion of an arm 17 as an engaging member formed with a piece 16 is pivotally connected to a shaft 18 so as to be freely rotatable. A locking piece 19 is provided protruding from the edge of the base end of this arm 17.
When the arm 17 is rotated upward at a predetermined angle, it engages with a protrusion 20 protruding from one of the bearing pieces 15a, thereby restricting further rotation.
Further, there is a dead center between the front part of the arm 17 and the bracket 14, and a spring 21 is stretched across the dead center to elastically bias the arm 17 to rotate upward and downward. There is.

On the other hand, an engagement bracket 22 facing the arm 17 in a vertical relationship is fixed to an upper frame 7' which is a fixing member of the seat bag 3, and the engagement piece 16 of the arm 17 is attached to this engagement bracket 22 in a rearward direction. is configured as an engaged member with ratchet-shaped teeth 23 [23a, 23b] that are engaged and locked and movable in the forward direction. A higher protruding first guide portion 24 is provided, and an arm 17 is provided at the rear.
The second guide portion 25 is shaped like a mountain and has a height such that the front edge surface of the engagement piece 16 comes into contact with the second guide portion 25 when the engagement piece 16 is rotated upward.
is provided.

Further, a return spring 26 is installed between the bracket 14 of the stay 11 and the upper frame 7', and always urges the stay 11 rearward.

Next, the operations of the adjustment mechanisms 17, 21, 22 and automatic return mechanisms 24, 25, 26 will be explained with reference to FIGS. 3 and 4.

Now, when the engagement piece 16 of the arm 17 is engaged with the first tooth 23a of the engagement bracket 22, the arm 17 is urged to rotate downward by the spring 21, and the stay 11 is urged by the return spring 26.
As a result, the engagement piece 16 is press-engaged with the tooth root between the first and second tooth portions 23a and 23b, and the stay 11 is prevented from rotating backward and is placed in a vertical state. (solid line in FIG. 3), the headrest 5 is held in its normal position on the upper surface of the seat bag 3.

When the headrest 5 is pulled forward from this state, the stay 11 resists the elasticity of the spring 26 and moves the shaft pins 13a, 13 against the brackets 12a, 12b.
The arm 17 is rotated forward about the pivot point b as the center of rotation, and along with this rotation, the arm 17 is pulled and the engagement piece 1
6 rides on the second tooth portion 23b of the engagement bracket 22, so that the arm 17 resists the elasticity of the spring 21 and slides onto the bearing pieces 15a, 15b.
As the engaging piece 16 rotates upward about the pivot point of the shaft 18, the engaging piece 16 climbs over the second tooth part 23b and is press-engaged with the tooth root in the front part in the same way as described above, and the stay 11 The headrest 5 is supported in a tilted forward rotational state (see the two-dot chain line a in Fig. 3).
is moved forward with respect to the seat bag 3 and held.

Conversely, when moving and holding the headrest 5 rearward with respect to the seat bag 3, the headrest 5
When the stay 11 is tilted forward and the arm 17 is pulled forward greatly, the arm 17 engages the engagement bracket 22.
The locking piece 19 is rotated significantly upward along the first guide portion 24 (FIG. 4, two-dot chain line c), and as it passes the dead center caused by the spring 21, the locking piece 19 is further jumped up and separated from the engagement bracket 22. Bearing piece 15a
is held in a state where it is engaged with the protruding piece 20 of
Dotted chain line d). When the tension on the headrest 5 is released in this state, the stay 11 is rotated backward by the elasticity of the return spring 26, and the front end surface of the engagement piece 16 of the arm 17 is moved to the second position of the engagement bracket 22.
Since the arm 17 hits the tip of the guide part 25 (solid line in the same figure) and slides into contact with its inner edge, the arm 17 is pushed down and rotated, and when it passes the dead center caused by the spring 21, it is rapidly rotated and the engagement piece 16 moves into the second guide. The stay 11 is pressed into engagement with the tooth valley at the lower part of the portion 25, and the stay 11 is supported in a tilted rearward state (as shown by the two-dot chain line b in FIG. 3).
The headrest 5 is moved rearward with respect to the seat bag 3 and held there.

In this way, in this example, the headrest 5
The front and back position of the seat bag 3 relative to the seat back 3 can be changed in three stages with a single operation, that is, the action of pulling the headrest 5. However, by increasing or decreasing the number of teeth on the engagement bracket 22, the variable stage and variable amount of the position can be changed. Can be set.

Further, if the engagement hole 27 of the spring 21 with respect to the arm 17 is formed into an arc shape with a smaller radius centered on the axis 18 of the pivot portion of the arm 17, the arm 17
In this case, the upward and downward rotational force exerted by the spring 21 becomes large, and the engagement and disengagement with the engagement bracket 22 can be performed in a stable state.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6. The same members as those in the above-mentioned embodiment will be designated by the same reference numerals and detailed explanations will be omitted.

In the figure, 31, 32, 37 are the adjustment mechanisms, 26,
Reference numerals 34 and 35 indicate automatic return mechanisms, respectively. To explain this in detail, in this example, an engagement rod 31 as an engaged member is horizontally suspended in the center of the connection bracket 14 of the stay 11, and on the other hand, A bracket 32 as an engaging member having a tooth shape is installed on the upper frame 7' so as to elastically rotate up and down across the dead center, and the engaging rod 31 and the rotating bracket 3 are connected to each other.
2, the stay 11 is rotatably supported in the front-rear direction and the front-rear position of the headrest 5 is adjusted.

That is, in this example, the connecting bracket 14 of the stay 11 is divided into two halves 14a and 14b at the center, and the inner ends thereof are bent to form supporting pieces 14a' and 14.
b' are formed facing each other at a required distance, and an engaging rod 31 is horizontally suspended between the support pieces 14a' and 14b'. On the other hand, the rotating bracket 32 has ratchet-shaped teeth 33 [33a, 33b] that are engaged with the engagement rod 31 in the rear direction and movable in the front direction.
A first guide section 34 higher than the tooth section 33 is provided in front of the tooth section 33, and a second guide section 35 is provided at the rear thereof. This rotating bracket 32 has a base end attached to a fixed bracket 36 fixed to the upper frame 7', and a shaft pin 3 is attached to the fixed bracket 36.
6' for pivoting in the vertical direction, and
A spring 37 made of a torsion spring is installed between the rotating bracket 32 and the fixed bracket 36 so that the rotating bracket 32 can be elastically rotated upward and downward across the dead center. The pivot bracket 32 is shown at the top in the drawing, i.e.
After rotating in the direction of separating from the engagement rod 31,
The proximal edge engages with the protrusion 36a of the fixed bracket 36 at a required rotation angle to restrict further rotation.

In this example configured as above, when the headrest 5 is pulled and the stay 11 is rotated forward (dotted chain line a' in FIG. 6), the engagement rod 31 engages the teeth 33 [33a, 33a, 33b] and get over it, the inclination of the stay 11 can be changed step by step. Also, when tilting the stay 11 to the rearmost position, the stay 11 is first tilted to the frontmost position, and the engaging rod 31 is used to move the rotating bracket. 1st of 32
By pressing the guide portion 34, the rotating bracket 32 is rotated upward and is rapidly rotated beyond the dead center to be separated from the engagement rod 31. At this point, when the tension on the headrest 5 is released, the stay 1
1 is rotated rearward (dotted chain line b' in FIG.
Touch and press. Therefore, rotating bracket 3
2 rotates downward past the dead center, and the tooth root at the rearmost portion engages with the engagement rod 31 to support the stay 11 in a tilted state toward the rearmost portion. Therefore, the headrest 5 is held at a rearward position with respect to the seat bag 3.

In this example as well, the rotating bracket 32 may be configured to engage with the engaging rod 31 from below, and the spring 3 made of a torsion spring may also be configured to engage the engaging rod 31 from below.
7 may be replaced by a spring 21 made of a tension spring, similar to the above-described embodiment.

Further, both of the above embodiments can be used in conjunction with a headrest that is adjustable in elevation. That is, by attaching the stay 11, the engagement bracket 22, and the rotating bracket 32 to the elevating member of the headrest relative to the seat bag, the head rest can be adjusted up and down with respect to the seat back, and its position in the front and back direction can also be adjusted. Can be adjusted to any posture.

It should be noted that the present invention can be implemented not only in the above-described embodiments but also in various modifications without changing the gist thereof.

Since the present invention is constructed as described above, it has the following effects compared to the conventional example.

(1) The present invention is equipped with an adjustment mechanism for adjusting the tilting of the headrest of the above structure and an automatic return mechanism for automatically returning the headrest to the rear, so that when the headrest is pulled forward, the engaging member The engaging member is engaged with the engaged member in stages and moved to the front position, and when the headrest is further pulled, the engaging member is disengaged by the first guide portion and the spring, and the return spring and the first The headrest is automatically returned to the rear position by the two guide parts. Therefore, with the present invention, the front and rear positions can be adjusted by simply pulling the headrest forward. Therefore, the operability is much better than that of the conventional example, and it is convenient for practical use.

(2) The first guide part and the second guide part of the automatic return mechanism are connected to the engaging part of the engaging member or the engaged member of the adjustment mechanism.
Since the guide portion and the guide portion are formed of the same material, the structure is simple, the number of parts is small, and failures are less likely to occur.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an example of a vehicle seat to which the device of the present invention is applied, Fig. 2 is a perspective view of an example of the device of the present invention, and Figs. 3 and 4 are enlarged sectional views showing the operating state of the device. , FIG. 5 is a perspective view of another example of the device of the present invention, and FIG. 6 is an enlarged side view of the main parts in FIG. 5. In the diagram, 3 is the seat back, 5 is the headrest,
11 is a stay, 7' is a seat back fixing member,
17, 32 are engaging members, 22, 31 are engaged members, 21, 37 are springs, 26 are return springs, 24, 34 are first guide parts, 25, 3
5 is a second guide portion.

Claims (1)

[Scope of utility model registration request] In a headrest device that supports the head of a seated person by pivoting a stay to the seatback of a seat so as to be rotatable in the front-rear direction, a device for adjusting the tilting of the headrest is provided between the stay and a fixing member of the seatback. An adjustment mechanism and an automatic return mechanism for automatically returning the headrest to the rear are provided, and the adjustment mechanism includes an engagement member provided on either one of the stay or the fixing member, and an engagement member provided on the other such that the engagement member is provided in front of the stay. The engaged member is engaged stepwise only in the forward direction by rotation to the engaged member, and the engaging member is rotated with the dead center in between the engagement direction and the disengagement direction with respect to the engaged member. The automatic return mechanism is configured to engage the engaging member at the frontmost rotational position of the stay on the front and rear end sides of the engaging portion of the engaging member or the engaged member. a first guide portion that guides the stay to rotate beyond the dead center in the uncoupling direction; and a first guide portion that rotates the engagement member in the engagement direction beyond the dead center at the rearmost rotational position of the stay. A headrest device comprising: a second guide portion that guides the stay; and a return spring that is stretched between the stay and the fixing member and urges the stay rearward.