JPS6114834Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a headrest restraint device for an automobile seat, and more particularly to an improvement in a headrest restraint device in which the headrest is vertically adjustable with respect to the seat back.

BACKGROUND ART As shown in FIG. 1, conventionally, in an automobile seat 1, a headrest main body 5 is mounted on a pair of support rods on the top of a seat back 4 which is connected to a seat bottom 2 by a reclining device 3 so as to be tilt adjustable. 6, 6, and the headrest body 5
Various head restraint devices are known in which the height can be adjusted in multiple stages according to the height of the occupant's head. There are some that engage in grooves formed in the rod and are released by operating an adjustment lever provided on the side of the seat bag, and others that are released by tilting the headrest body.

However, this type of head restraint device has drawbacks such as a complicated structure, a large number of parts, and difficulty in operation.

Further, in the head restraint device, a retaining groove is formed in the same line as the concave groove of the support rod, and the spring member The locking pawl engages with the retaining groove to prevent it from coming out, but when the biasing force to the locking pawl is inhibited due to weakening of the elastic force of the spring member, foreign matter, etc. However, the main body of the headrest did not perform its function satisfactorily and had the disadvantage that the main body of the headrest could easily be removed from the seat bag.

Purpose of the invention The present invention was made in view of the above problems, and is a headrest train for automobile seats that has a simple structure, good operability, and prevents the headrest body from coming out of the seatback in the event of a collision, etc. The purpose of this project is to provide a

Summary of the invention In the headrest restraint device for an automobile seat according to the invention, a pair of support rods of the headrest are movably supported up and down by a pair of guide cylinders provided at the upper part of the seat back frame, and the support rods of the headrest are vertically movably supported. one of them is provided so as to be swingable about its lower end as a fulcrum, a locking groove is provided in the support rod that fits into the guide cylinder, and a locking piece is provided on the movement trajectory of the locking groove of the guide cylinder, When the locking groove is lowered by the elastic member that presses the guide tube against the support rod, the locking piece locks the guide tube and biases the guide tube in one direction against the elastic member. The locking groove of the locking piece is unlocked to make the support rod movable in the vertical movement direction, and a protrusion is provided below the locking groove at the lower end of the support rod in the same line as the locking groove. It is characterized in that the locking piece locks the protrusion to prevent further upward removal.

Embodiments Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In FIG. 2, 11 is an end bent inward of a pipe-shaped frame 11a raised from below.
A seat back frame 12 in which recessed portions at both ends of a connecting support portion 11b having a U-shaped cross section are connected to the upper tier 11b ₁ and the lower tier 11b ₂ on the back side by fitting and fixing them from the back side.
1 is a headrest body that supports the occupant's head;
Reference numerals 3 and 14 denote first and second support rods extending downwardly from the lower surface of the headrest main body 12 and moving the headrest main body 12 in the vertical movement direction while being guided by the connecting support portion 11b;
Reference numeral 5 denotes a first pole guide 16 having a rectangular plate-like collar portion 15a formed on the upper portion thereof, and having a substantially rectangular column shape elongated in the width direction of the seat back so as to fit the first support column 13 so as to be movable in the vertical direction. 17 is a cylindrical second pole guide which forms a rectangular plate-shaped collar part 16a on the upper part, and into which the second support column 14 is fitted _so as to be movable in the vertical direction; For example, the leaf spring 17 is fixed with a rivet 18 or the like, and the other end is an open end.
The open end of the first pole guide 15 comes into contact with the inner side surface 15b of the seat bag in the width direction, and presses and urges the first pole guide 15 outward in the width direction of the seat bag, so that the first pole guide 15 stands upright. I have to. The first pole guide 15 has grooves 19, 19 (see Fig. 4) recessed in the lower part of the front and back surfaces of the upper part of the connecting support part _11b1 , with the upper part being able to swing in the width direction of the seat bag. A guide ring 22 that guides the lower part of the _first support column 13 in the vertical movement direction is irremovably fitted into the fitting hole 20 having a rectangular cross section. On the other hand, the second pole guide 16 is fitted and fixed in fitting holes 23 and 24 provided in the upper stage 11b ₁ and the lower stage 11b ₂ , respectively.

As shown in FIGS. 3 and 4, the first pole guide 15 is provided with a through hole 25 in which the first support column 13 is fitted and is movable in the vertical movement direction, and the first pole guide 15 has a through hole 25 that extends from the lower end opening toward the upper end opening. Accordingly, a gap 26 having an arcuate cross section that increases outward in the width direction of the seat bag is provided, and the outer end surface of the seat back in the width direction of the collar portion 15a is raised upward to form the operating portion 27.
By pressing the operating portion 27 inward in the width direction of the seat bag (direction P in FIG. 3),
The first pole guide 15 is biased inward in the width direction of the seat bag.

In the axial direction of the inner side surface in the width direction of the seat back of the first support column 13, the upper edges 28a, . . . , 28a are slightly cut out diagonally, and the lower edges 28b, . The locking grooves 28, .
A lock pin 29 serving as a locking piece is installed inside the seat bag in the width direction near the upper end opening of the through hole 25 of the pole guide 15 so as to slightly cross the through hole 25 and be positioned on the movement track of the locking grooves 28, . . . , 28. is provided so that when the locking grooves 28, .
8b, . . . , 28b, which are movable upward.

On the other hand, as shown in FIG. 5, by using the operating section 27 to bias the first pole guide 15 inward in the width direction of the seat bag against the leaf spring 17, the first pole guide 15
The first support 13 is fitted into the gap 26 and the locking groove 2 is closed.
The lock pin 29 is removed from the headrest 8, and the first support 13, that is, the headrest main body 12 is made freely movable in the vertical direction. Therefore, the first pole guide 1
The gap 26 at 5 is provided so that the first pole guide 15 can be biased using its lower end as a fulcrum by operating the operating section 27, and the lock pin 29 can be removed from the locking groove 28.

Further, a protrusion 30 protruding in the diametrical direction is integrally provided on the lower edge of the locking groove 28 at the lowermost end, and the first
The locking groove 28 of the through hole 25 of the pole guide 15,
..., 28 is provided with a guide groove 31 that guides the protrusion 30 in a vertically movable manner, and the first pole guide 15 is biased inward in the width direction of the seat back using the operation section 27 to engage the first pole guide 15. Stop groove 2
When the headrest main body 12 is lifted with the lock pin 29 engaged with the lock pin 8 released, the lock pin 29 locks on the protrusion 30 that has been raised by being guided by the guide groove 31, and the Prevent upward movement. When the operating portion 27 is returned to its original state, the lock pin 29 engages with the lowermost locking groove 28, and the headrest main body 12 is locked at the highest height adjustment position. Therefore, the operation section 2
When the headrest main body 12 is raised by using the lower edge 28b of the locking groove with the lock pin 29 locked in the locking groove 28 without operating the lock pin 29, the operation part 27 can be used to lock the lock pin 29. Release the retaining groove 28 and remove the headrest body 12.
Even when the headrest body 1 is raised, the lock pin 29 always locks the protrusion 30 and the headrest body 1 is moved upward.
Preventing the escape of 2. On the other hand, when removing the headrest main body 12 from the seat bag for multi-purpose use of the seat, for example, to fully flatten the seat or for maintenance, etc., the lock pin 29 must be removed from the first pole guide 15, or
By bending the portion of the lock pin 29 corresponding to the protrusion 30 inward in the width direction of the seat bag, the first support column 13 and therefore the headrest main body 12 can be removed.

In addition, as in the above embodiment, the locking grooves 28, .
Since the second pillar 14 is supported movably only in the vertical direction by the second pole guide 16, the headrest main body 1
2 does not swing in the direction of releasing the locking of the locking groove 28 by the lock pin 29, and the locking groove 2 is more securely locked.
8,..., 28 can be locked.

In this embodiment, as shown by the two-dot chain line in FIG. 1, the operating section 27 of the first pole guide 15 is disposed on the top surface of the seat bag 4, and is visible to the passenger, making it easy to operate.

Furthermore, in this embodiment, the upper edge 2 is attached to the first support 13.
8a,...,28a and lower edge 28b,...,28b
Although the locking grooves 28, .

Effects of the invention According to the invention, a protrusion is provided below one of the locking grooves in which the locking piece provided on one guide tube locks, and in the same line as the locking groove, so that the locking piece is locked. Since it was designed to stop and prevent further upward removal,
This has the effect of reliably preventing the headrest from coming off the seat bag in the event of an automobile collision or the like. Moreover, the guide piece provided on one of the guide tubes locks the locking groove of the support rod by the pressing force of the elastic member, and also biases the guide tube in one direction with the lower end as a fulcrum.
Since the locking piece can be removed from the locking groove to release the lock, the guide cylinder performs its original guide function as well as the function of an adjustment lever, simplifying the overall structure of the device and reducing the number of parts. In addition, there is an effect that the locking and unlocking by the locking piece of the locking groove can be reliably performed with a simple operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an automobile seat, FIG. 2 is a perspective view of a head restraint device according to the present invention,
Figure 3 is a cross-sectional view along the line X-X in Figure 2 when the locking piece locks the locking groove, and Figure 4 shows the same as Figure 3 when the locking piece locks the locking groove. 2, FIG. 5 is a sectional view showing when the locking piece releases the locking groove in FIG. 3, and FIG. 6 is a cross-sectional view of the locking piece in FIG. FIG. 3 is a sectional view showing when the protrusion is locked. 11... Seat back frame, 12... Headrest main body, 13, 14... First and second pillars,
15, 16...first and second pole guides, 17...
...Plate spring, 28...Latching groove, 29...Lock pin as a locking piece, 30...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A pair of support rods of the head rest are movably supported up and down by a pair of guide tubes provided at the top of the seatback frame, and the support rods are locked at a predetermined vertical movement position. In a head restraint device for an automobile seat, one of the guide tubes into which the one of the support rods is fitted is provided so as to be swingable about its lower end as a fulcrum, and a locking groove is provided for the one of the support rods. On the other hand, it is on the movement trajectory of the locking groove and locks when the locking groove descends,
The guide cylinder is provided with a locking piece that releases the lock by biasing the guide cylinder in one direction and allows the support rod to move freely in the vertical movement direction, and the locking piece locks the locking groove. An elastic member is provided on the seatback frame to urge the guide cylinder against the support rod in the direction, and a protrusion is provided below the locking groove at the lower end of the support rod in the same line as the locking groove, so that the lock piece 1. A head restraint device for an automobile seat, characterized in that the protrusion is locked to prevent further upward removal.