JPH0223179Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a head restraint device for an automobile seat.

(Prior Art) The headrest of an automobile seat is designed to be able to adjust its position up and down according to the height of the head of the seated person. In addition, the headrest needs to be prevented from coming off in the event of a rollover (capsizing).

Conventionally, as shown in FIG. 1, a guide cylinder 5, in which support rods 2 and 3 of a headrest 1 are respectively supported by a headrest support frame 4 of a seat back frame, has been used.
In the head restraint device, the height of the head restraint 1 can be adjusted by guiding the head restraint 1 in the vertical direction with 6.
A stopper pin 8 is attached to the operating member 5a provided at the upper end of the guide tube 5 so as to cross the upper end opening 7 in a chord shape.
is inserted, and this pin 8 locks one of the locking grooves 10, 10, ... cut into the support rod 5. At the same time, the lower end of the support rod 5 has a groove protruding in the radial direction. A protrusion 11 is provided, and the protrusion 11 is prevented from coming off by a stopper pin 8.

Note that when the operating member 5a is pushed in the direction of arrow A and the guide cylinder 5 is tilted by the distance between it and the support rod 2 against the spring force of the spring 9, the stopper pin 8 and the recess 10 are The engagement is released, and the height of the headrest 1 can be adjusted in this state.

By the way, the above-mentioned stopper pin 8 is inserted into the hole of the guide cylinder 5 using tweezers or the like and is fixed, so once it is fixed, it cannot be easily removed. Therefore, when removing the headrest 1 from the back frame 4, there was a problem in that it took a lot of effort.

(Purpose of the invention) The object of the invention is to provide a head restraint device for an automobile seat that allows the head restraint to be easily removed when the head restraint needs to be removed. That's true.

(Structure of the invention) An automobile in which a support rod attached to the headrest is supported so as to be movable up and down by a guide tube provided at the top of the seatback frame, and the support rod can be locked at a predetermined vertical movement position. In a head restraint device for a seat, a retaining protrusion is brought into contact with the lower end of at least one of the support rods in a radial outward direction, and a retaining protrusion is provided above the retaining protrusion for locking at a predetermined vertical movement position. The inner diameter of the guide tube of the support rod, which is provided with a matching lateral groove and a retaining protrusion, is slightly larger than the outer diameter of the support rod, and an operating section for vertically moving and rotating the guide tube is provided on the upper part of the guide tube. , the inner surface of the guide tube is provided with a first vertical groove for guiding the retaining protrusion during vertical movement and a second longitudinal groove for guiding the retaining protrusion during removal; An arc-shaped notch extending between the vertical groove and the second vertical groove is provided to enable the guide cylinder to rotate, and when the retaining protrusion of the support rod is engaged with the first vertical groove of the guide cylinder, the support part is rotated. The operation part is provided with a locking means that engages with the horizontal engagement groove but does not engage with the horizontal engagement groove of the support part when the retaining protrusion of the support rod is engaged with the second vertical groove of the guide cylinder. The first means is the retaining protrusion of the support rod.
While engaged with the horizontal groove, the retaining protrusion locks the support rod in a manner that prevents it from being removed when the operating section is moved up and down, and when the supporting rod is removed, it resists the biasing force of the spring means by rotating the operating section. The retaining protrusion of the support rod can be passed through the notch of the operation part so that the retaining protrusion is engaged with the second longitudinal groove, and in this state, the locking means prevents the retaining protrusion from being removed. It is characterized by allowing the support rod to be removed from the guide tube.

(Effects of the invention) According to the invention, two vertical grooves are provided in the guide cylinder of the support rod, and normal vertical position adjustment is performed by the first vertical groove, and pulling out of the headrest is performed by the second vertical groove. As a result, the vertical movement of the headrest can be adjusted by moving the operating section up and down, while the removal of the headrest requires engaging the retaining protrusion in the second vertical groove formed by rotating the operating section. As described above, moving the headrest up and down and removing it require completely different operations, and under normal conditions, the headrest will not come off. Therefore, when the need arises, there is no problem in adjusting the position of the headrest and preventing it from coming off.
The headrest can be easily removed.

(Example) The illustrated embodiment will be described below.

As shown in FIG. 2, the support rods 2 and 3 of the headrest 1 are guided in the vertical direction by guide tubes 5 and 6 that are not removable from the headrest support frame 4, as in the conventional case. be.

In the present invention, the following features are added to the guide cylinder 5 so that the support rods 2 and 3 of the headrest 1 can be pulled out when necessary without removing the stopper pin 8.

As shown more specifically in FIGS. 3 to 5, the hole diameter of the cylindrical portion 12 of the guide tube 5 is set appropriately larger than the outer diameter of the support rod 2, and the inner surface of the hole 12a is provided with a support rod. Stopper 1 protruding from the lower end of 2
first and second guide grooves 13 and 14 into which the stopper 11 can be fitted and guide the stopper 11 in the vertical direction;
are carved parallel to the axis at an appropriate angle.

In addition, a rectangular operation lever 15 provided integrally with the guide tube 12 at the upper end of the guide tube 5 has a circular opening 16 that matches the hole 12a of the tube section 12, and a circular opening 16 along the periphery of the opening 16. Arc-shaped notch 1 spanning the angular range of the first and second guide grooves 13 and 14
The stopper pin 8 is inserted in the width direction of the operating lever 15 so as not to interfere with the second guide groove 14 while crossing the front of the first guide groove 13 .

Now, as shown in FIG.
When the stopper pin 8 is held in the normal position, the stopper pin 8 is attached to the support rod 5, as shown in FIG. 3b.
The headrest 1 is engaged with the locking groove 10 of the headrest 1, thereby locking the headrest 1 from falling.

When the operating portion 15a of the operating lever 15 is pushed against the spring force of the spring 9 as shown by arrow A in FIG. 2, the stopper pin 8 is removed from the locking groove 10, the support rod 2, and therefore the headrest 1, are unlocked and the height of the headrest 1 can be adjusted.

However, even in this state, the stopper pin 8 crosses the front of the first guide groove 13, so even if you try to pull out the headrest 1, the stopper 11 will be securely locked by the stopper pin 8, and the headrest will remain in place. 1 will never escape.

Next, when it becomes necessary to pull out the headrest 1, as shown by arrow B in FIG.
It is only necessary to perform a rotation operation by the angle between the second guide grooves 13 and 14. In this state, the stopper 11 of the support rod 2 is aligned with the second guide groove 14, and the stopper pin 8 does not interfere with the second guide groove 14, so the stopper 11 is aligned with the second guide groove 14.
You will be able to escape through 4.

When inserting the headrest 1, just do the reverse operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional head restraint device. FIG. 2 is a perspective view of a head restraint device according to an embodiment of the present invention. FIGS. 3a and 3b are a plan view and a partial sectional view, respectively, showing the engagement between the support rod and the guide tube during locking. FIGS. 4a and 4b are a plan view and a partial sectional view, respectively, showing the engagement between the support rod and the guide cylinder during lock-off. FIG. 5 is a plan view showing the engagement between the support rod and the guide tube during extraction. 1...Head rest, 2, 3...Support rod, 5,
6... Guide tube, 8... Stopper pin, 9...
Spring, 10... Concave groove, 11... Stopper, 1
3, 14...first and second guide grooves, 15...operation lever.

Claims (1)

[Claims for Utility Model Registration] A support rod attached to the headrest is supported so as to be movable up and down by a guide tube provided at the top of the seat back frame, and the support rod can be locked at a predetermined vertical movement position. In the head restraint device for an automobile seat, a retaining protrusion is brought into contact with the lower end of at least one of the support rods in a radially outward direction, and is locked at a predetermined vertical movement position above the retaining protrusion. The inner diameter of the guide cylinder of the support rod is slightly larger than the outer diameter of the support rod, and the inner diameter of the guide cylinder of the support rod is provided with a horizontal groove for engagement, and a protrusion for preventing removal is provided, and the guide cylinder is vertically moved and rotated on the upper part of this guide cylinder. An operating portion is provided, and a first vertical groove for guiding the retaining protrusion during vertical movement and a second vertical groove for guiding the retaining protrusion during removal are provided on the inner surface of the guide tube; An arc-shaped notch extending between the first vertical groove and the second vertical groove is provided to enable the guide cylinder to rotate, and when the retaining protrusion of the support rod is engaged with the first vertical groove of the guide cylinder. A locking means that engages with the horizontal engagement groove of the support part but does not engage with the horizontal engagement groove of the support part when the retaining protrusion of the support rod is engaged with the second vertical groove of the guide cylinder is provided on the operating part. and a spring means for biasing the locking means to lock in the engagement horizontal groove of the support rod, and the locking means is operated when the retaining protrusion of the support rod is engaged with the first longitudinal groove. When the support rod is moved up and down, the retaining protrusion locks the support rod in an unremovable manner, and when the support rod is removed, the rotation of the operating portion causes the retaining protrusion of the support rod to move against the bias of the spring means. can be passed through the notch of the operating part so that the retaining protrusion engages with the second longitudinal groove, and in this state, the locking means allows the retaining protrusion to come out and the guide tube of the support rod is engaged with the second longitudinal groove. A head restraint device for an automobile seat, characterized in that it can be removed from the seat.