JPH056827Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a headrest support for vertically adjustable support for a headrest disposed on a seat bag in a seat such as an automobile.

(Prior Art) Generally, as shown in FIGS. 2 and 3, a headrest support is a structure in which a headrest stay 4, which is vertically disposed on a headrest 3, is inserted into a support tube 2 provided at the upper end of a seat bag 1. At the same time, a lock plate 7 provided with a push knob 6 is held within the upper end box portion 5 of the support tube 2 so as to be movable in push and return motions.

When the lock plate 7 returns, its lock portion 8 engages with the notch 9 of the headrest stay 4 to lock the headrest 3 at a predetermined height position.

On the other hand, when the lock plate 7 is pushed, the engagement is released and the headrest 3 can be moved up and down.

The conventional example shown in Fig. 7 and Fig. 8 is
The device disclosed in Japanese Patent No. 16446 and shown in FIG. 7 has one return spring a arranged on one side inside the upper end box part b, and a lock plate c.
The lock part d is the notch f of the headrest stay e.
It is biased in the return direction (R direction) where it engages. g is a push knob, and when pushed, the lock plate c is pushed in the direction of arrow P to release the engagement.

As shown in FIG. 8, there is also a push-operated type in which two return springs a are arranged on both sides of the upper box part b.

(Problem to be solved by the invention) However, in the above-mentioned conventional example in which one return spring is arranged (Fig. 7), when the lock plate is returned to one side, it is returned by the push of the return spring. However, since sliding friction occurs on the other side with the inner wall of the upper end box, the return movement on both sides becomes unbalanced and the lock plate is twisted inside the upper end box, making the return movement smoother. The problem is that it is difficult to do.

On the other hand, in the case where two return springs are arranged (Fig. 8), the return movement of the lock plate is smooth due to the urging force acting on both sides of the lock plate, but two return springs are required and the number of parts is reduced. A problem arises in that there are many.

In view of the above-mentioned problems, in another application filed at the same time as this application, the present applicant disposed one return spring on one side of the upper end box part, and set the center of rotation of the lock plate on the other side. A given headrest support is suggested. A pivot pin is generally used as a means for providing this rotation center.

In view of the above, the present invention not only makes it possible to push the lock plate smoothly by pushing the push knob, but also makes it possible to smoothly return the lock plate using a single return spring. It is an object of the present invention to provide a headrest support which can further reduce the number of parts by omitting the pivot pin, which is a separate part, and which can be easily assembled.

(Means for Solving the Problems) In order to achieve the above object, the present invention disposes a return spring that biases the lock plate in the return direction on one side of the upper end box part, and on the other side of the upper end box part. A pin insertion hole is formed in the pusher knob so as to face vertically, and a pin located on the same side as the pin insertion hole and protrudes forward and then changes direction in the vertical direction is integrally formed on the push knob.
The vertical part of this pin is inserted into the pin insertion hole to provide a center of rotation for the lock plate, and the push knob is placed in the normal position at the part of the knob support seat in the upper end box part facing the pin insertion hole. It is characterized by forming a notched recess that allows the pin to pass only at a position outside of the pin insertion hole, and allows the vertical portion of the pin to be guided into the pin insertion hole.

(Function) In the above configuration, when the push knob of the lock plate is pushed, the lock plate and the push knob resist the biasing force of the return spring arranged on one side inside the upper end box part, and the push knob is pushed on the other side. The vertical portion of the pin integrally formed with the knob rotates about the pin insertion hole into which the vertical portion is inserted, and moves forward as a whole.

This pushing movement of the lock plate releases the engagement between the lock portion of the lock plate and the notch of the headrest stay, allowing the headrest to move up and down.

After moving the headrest up and down to the specified height,
When the push force on the push knob is released, the lock plate and the push knob are pushed in the return direction by the biasing force of the return spring and retreat as a whole while rotating around the rotation center.

This return movement of the locking plate allows the locking portion to engage the notch and lock the headrest in a predetermined height position.

Also, since the center of rotation is given to the lock plate during push and return, the lock plate may become distorted due to frictional sliding with the inner wall surface of the upper end box, making push and return movements difficult. This situation can be avoided, and the push and return movements of the lock plate can be performed smoothly.

This type of head rest support has only one return spring, and the pin insertion hole for obtaining the center of rotation can be formed integrally with the upper end box part, and the pin can be integrally formed with the push knob, so they are not separate parts. It has a simple structure that can reduce the number of parts by omitting pivot pins and the like.

Also, the push knob and the upper end box part can be assembled in the following steps.

Place the push button in the position shown by the imaginary line in Figure 4, that is, in a position that is out of its normal position.
Next, the push knob is moved in a direction perpendicular to the knob support seat so that the pin passes through the notched recess and the vertical portion thereof is inserted into the pin insertion hole. When the vertical portion of the pin is inserted into the pin insertion hole in this manner, the push knob is then rotated in the direction of the arrow in FIG. 4 to guide it to the position shown by the solid line in FIG. In this normal position, vertical movement of the push knob is prevented by the knob support seat, so that the pin can be prevented from coming off from the pin insertion hole.

When assembling the push knob to the upper end box in this way, if you assemble the lock plate and return spring that have been placed in the upper end box in advance to the push knob, you can assemble the head rest support all at once. It can be done easily.

(Example) An example of the present invention will be described based on FIGS. 1 to 6.

The headrest support includes a pair of left and right support tubes 2 embedded in the upper end of the seat bag 1. This support tube 2 passes through a pair of left and right headrest stays 4 vertically disposed on the headrest 3.
A pair of left and right locking protrusions 1 are provided on the outer periphery of the lower end of the support tube 2.
0 is provided in a protruding manner to prevent the buried support cylinder 2 from slipping out from the seat bag 1. In addition, it facilitates insertion and attachment when buried, and the locking protrusion 10
A slit 11 is provided to ensure that the seat bag 1 is bitten into the seat bag 1.

A lock plate 7 equipped with a push knob 6 is held within the upper end box portion 5 of one of the support tubes 2 so as to be movable in push motion (P direction) and return motion (R direction). Reference numeral 12 designates a housing space for housing the lock plate 7, which restricts the vertical movement of the lock plate 7 during push and return.

This lock plate 7 is made of sheet metal and has a substantially rectangular outer shape, and has a stay loose insertion hole 13 in the center thereof into which the headrest stay 4 is loosely inserted, as shown in FIG. The inner edge on the back side constitutes a lock portion 8 that engages with a notch 9 that is carved in a plurality of upper and lower stages on one headrest stay 4.
Further, a protruding piece 16 is provided extending from the back side of the lock plate 7. This protruding piece 16 comes into contact with a locking wall 17 in the upper end box portion 5 during return, thereby restricting the return movement of the lock plate 7. Such a lock plate 7 can be formed as a whole by punching or the like.

The upper end box portion 5 has a stay insertion hole 18 approximately in the center thereof, through which the headrest stay 4 is inserted. The push knob 6 is arranged on a knob support seat 5a extending forward from below the opening 23 of the upper end box portion 5. A lock plate 7 is placed on the right side of the upper end box part 5 in the return direction R.
A return spring 19 is interposed between the push knob 6 and the upper end box portion 5. One end side of the return spring 19 is
It is held in a holding hole 20 with a circular cross section that is bored in the upper end box part 5. The other end is held in the holding hole 21 of the push knob 6.

These holding holes 20 and 21, which hold the return spring 19, are widened at the opening side so as not to interfere with the horizontal deflection of the return spring 19 caused by the push operation of the push knob 6. Also, the return spring 19 is
The urging force on the push knob 6 is arranged in a substantially vertical direction.

At the front left side of the upper side inside the upper end box part 5,
The pin insertion hole 14 is formed in a direction perpendicular to the knob support seat 51a. This pin insertion hole 14
is located in the upper layer of the accommodation space 12 and is open toward the knob support seat 5a below. A cutout recess 28 is formed from a portion of the knob support seat 5a facing the pin insertion hole 14 to the left side.

The push knob 6 is made of synthetic resin, and a pin 15 that protrudes forward (in the push direction P) and changes its direction upward is integrally formed in a portion facing the pin insertion hole 14 on the left side. The upward tip portion of the pin 15, that is, the vertical portion 15a, is inserted into the pin insertion hole 14. The planar shape of the pin 15 is slightly smaller than the planar shape of the notched recess 28 so that the pin 15 can easily pass through the notched recess 28.

On the upper end box part 5 side of the push knob 6,
It has a slit 25 into which the front side 24 of the lock plate 7 is inserted. As shown in FIG. 6, a locking pawl 26 is provided in the slit 25 for elastically returning and locking the inserted front side portion 24. Further, the operation surface 27, which is always exposed to the outside from inside the upper end box part 5 of the push knob 6, has an outer shape that is substantially the same as that of the upper end box part 5.

In addition, the assembly work of this headrest support is as follows:
The lock plate 7 is inserted in advance into the accommodation space 12 of the upper box part 5, and the push knob 6 is first inserted into the housing space 12 of the upper end box part 5.
is placed at a position deviating from the normal position shown in the imaginary line in FIG. At this time, the vertical portion 15a of the pin 15
is vertically opposed to the pin insertion hole 14 of the upper end box portion 5. Next, push knob 6
is moved so that the pin 15 passes through the cutout recess 28 of the knob support seat 5a from below to above, and the vertical portion 15a of the pin 15 is inserted into the pin insertion hole 14.

Next, insert the push knob 6 into the pin insertion hole 14.
4 along the knob support seat 5a to the normal position shown by the solid line in FIG. Then, a return spring 19 is interposed between the push knob 6 and the upper end box part 5, and the front side part 24 of the lock plate 7 is inserted into the slit 25 of the push knob 6. The work is completed.

The rotation of the push knob 6 after assembly is restricted by the lock plate 7 in the upper end box part 5, so the pin 15 moves to the position of the notch recess 28 and the vertical part 15a fits into the pin insertion hole 14. It is possible to prevent the user from leaving the site.

The operation of the headrest support configured as described above will be explained based on FIGS. 4 to 6.

When the headrest 3 is locked at a predetermined height position, the lock portion 8 of the lock plate 7 is engaged with the notch 9 of the headrest stay 4, as shown in FIG. At this time, the lock plate 7 is urged in the return direction R by the return spring 19 on the right side (upper side in the figure).

To move the headrest 3 up and down, the operating surface 27 of the push knob 6 is pushed toward the upper end box portion 5 against the biasing force of the return spring 19, as shown in FIG. The lock plate 7 is pushed around the pin insertion hole 14 (in the P direction in the figure).

This allows the lock portion 8 of the lock plate 7 to be disengaged from the notch 9, allowing the headrest 3 to move up and down.

After adjusting the height position of the headrest, when the push force is released, the push knob 6 is pushed in the return direction R by the return spring 19. The lock plate 7 makes a return movement (in the R direction in the figure) with the pin insertion hole 14 as the center of rotation, and the lock portion 8 is engaged with the notch 9 as shown in FIG.

Thereby, the headrest 3 can be locked at a predetermined height position.

According to this embodiment, the push and return movements of the lock plate 7 are performed by rotation around the pin insertion hole 14, thereby avoiding sliding friction between the lock plate 7 and the inner wall of the upper end box portion 5. Therefore, the push and return movements of the lock plate 7 can be performed smoothly.

The present invention can be configured in various ways other than those shown in the above embodiments.

For example, in the above embodiment, the lock plate is formed into a substantially square shape, but it may be formed into a substantially U-shape or other shapes. The shapes of the push knob, upper end box portion, support cylinder, etc. are not limited to those shown in the above embodiments, and may be designed as desired.

Further, in the above embodiment, the vertical portion of the pin integrally formed with the push knob is provided facing upward, but it may be provided facing downward.

(Effects of the invention) Since the present invention has the above-mentioned configuration and function, it has a simple structure that uses only one return spring and eliminates the separate pivot pin, reducing the number of parts. , it is possible to smoothly push and return the lock plate, and it is possible to provide a headrest support that is easy to assemble.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view showing its overall arrangement, Fig. 3 is a vertical side view of its main parts, and Fig. 4 shows the lock portion of the lock plate. A cross-sectional plan view of the upper end box portion engaged with the notch of the headrest stay, FIG. 5 is a partially cut-away plan view showing the push operation, and FIG. 6 is a vertical cross-sectional side view of the main part. figure,
7 and 8 are plan views of the conventional example. 1...Seat back, 2...Support cylinder, 3...Headrest, 4...Headrest stay, 5...
Upper end box part, 5a... Knob support seat, 6... Push knob, 7... Lock plate, 8... Lock part, 9... Notch, 14... Pin insertion hole, 1
5...Pin, 15a...Vertical portion, 19...Return spring, 28...Notch recess.

Claims (1)

[Scope of utility model registration request] A headrest stay hanging vertically from the headrest is inserted into the support cylinder provided at the upper end of the seat bag, and a lock plate equipped with a push knob in the box at the upper end of the support cylinder can be pushed and returned. When the lock plate returns, the lock portion engages with the notch in the headrest stay to lock the headrest at a predetermined height, and when the lock plate is pushed, the engagement is released and the headrest can move up and down. In the head rest support, a return spring is placed on one side inside the upper end box part to bias the lock plate in the return direction.
A pin insertion hole is formed in the other side of the upper end box part so as to face vertically, and a pin that is located on the same side as this pin insertion hole and changes direction vertically after protruding forward is attached to the push knob. The vertical part of the pin is inserted into the pin insertion hole to provide a center of rotation for the lock plate, and a push knob is provided at a portion of the knob support seat of the upper end box portion facing the pin insertion hole. 1. A headrest support, characterized in that a notched recess is formed that allows the pin to pass only at a position deviated from a normal position and allows the vertical portion of the pin to be guided into the pin insertion hole.