JPS643408Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headrest device suitable for use in a seat of a vehicle, particularly an automobile.

Conventional headrest devices of this type are configured to vertically adjust and fix the headrest through frictional engagement between the headrest stay and a holder attached to the seat bag. In order to perform this operation easily, it is desirable that the frictional force be small; however, if an impact is applied to the occupant's head in a rear-end collision, etc., a force is applied in the downward direction, and this force is quite large. Therefore, if the operability is improved, that is, if the frictional support force is reduced, the vehicle will descend unnecessarily upon impact, and it will not be possible to ensure the safety of the occupants, so it is necessary to satisfy both operability and safety maintenance function at the same time. There was a drawback that I couldn't do it.

Therefore, in order to satisfy both of these conflicting aspects at the same time, the present invention locks the head rest stay at least downward at all times and maintains that position, and releases the lock with a simple operation when making adjustments. The present invention provides a headrest device that allows smooth vertical adjustment.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a vehicle seat equipped with a headrest device according to the present invention, where 1 is a seat cushion, 2 is a seat back, and 3 is a headrest device. This headrest device 3 is composed of a headrest main body 4, headrest stays 5 and 6, a lock release lever 7, and a holder mechanism 8.

Bottom part 9a of frame 9 of headrest main body 4
A short tube 11 having a threaded portion 10 on the inner circumferential surface corresponding to one headrest stay 5 is passed through one side and fixed via a flange 12, and a short tube is attached to the circumferential surface near the short tube 11. An arcuate long hole 13 is formed around the cylinder 11.

The lock release lever 7 is fixed to the base through a cylinder 14, rotatably fitted to the protruding lower end of the short cylinder 11, and has a rising protrusion 15 formed at its rear end and inserted into the elongated hole 13. . One headrest stay 5 has a threaded portion 16 formed on the outer periphery of its upper end.The threaded portion 16 is inserted into the short tube 11 through the cylinder 14, and is rotatably screwed into the threaded portion 10. Through-holes 17 and 18 communicating with each other are bored in the corresponding parts of the lock and the pin 19 is inserted through the holes 17 and 18 to be engaged with the cylinder 14, that is, the lock release lever 7. Engagement grooves 20a, 20b at appropriate intervals
is formed.

One of the headrests 5 is moved along the elongated hole 13 by the return spring 22 stretched between the raised protrusion 15 and the cut-out protrusion 21 protruding from the bottom surface 9a of the frame 9. It is always rotated and held in one direction by being rotated and biased.

The holder mechanism 8 is made up of a bracket 23 fixed to the back frame 2a and a holder 24 that inserts and supports the head rest stay 5 fitted to the bracket 23. The holder 24 has a tubular shape and has two flanges on the top. 24a and 24b are separated and the tsuba 2
Cut grooves 25a, 25 on both sides between 4a and 24b
b, and insert the U-shaped lock spring 26, and both pieces 26a, 26b of this spring 26.
A portion thereof faces into the inner space, and an engaging claw edge 27 and an axial groove 28 are provided at the lower end. This holder 24 is fitted into the bracket 23 and engaged on the upper and lower surfaces by the lower collar 24b and the engaging claw edge 27 at the lower end, and is fixedly attached to the bracket 23 in the vertical direction.

When the above-mentioned headrest stay 5 is inserted into the inner space of the holder 24 attached to the bracket 23 in this way, both pieces 2 of the lock spring 26 are inserted.
6a and 26b are engaged with the engagement grooves 20a and 20b on both sides of the headrest stay 5, and the headrest stay 5 is locked to the holder 24.

The upper end of the other headrest stay 6 is fixed to the bottom surface 9a of the headrest frame 9.
The lower half is inserted into and supported by the other bracket 29 fixed to the back frame 2a via a tube 30 so as to be slidable in the vertical direction.

With the above configuration, when a downward impact force is applied to the headrest main body 4, one headrest stay 5 is engaged with the holder mechanism 8 by the lock spring 26 and is in a locked state, so that the holder mechanism 8 The impact force is transmitted to and supported by the back frame 2a, thereby preventing the headrest main body 4 from rapidly moving downward.

To adjust the height of the headrest main body 4 to suit the occupant from this state, press and rotate the lock release lever 7 against the biasing force of the return spring 22, and the headrest stay 5 will be moved to the short tube 1 of the frame 9.
The lock spring 26 is rotated spirally by the threaded engagement of the threaded portions 10 and 16, and this rotation causes the engagement grooves 20a, 20b to separate from both pieces 26a, 26b of the lock spring 26, and also to separate the engagement grooves 20a, 20b from both pieces 26a on the circumferential surface. ,26b
When the headrest stay 5 is pushed apart, the lock is released and the headrest stay 5 can be slid vertically relative to the holder mechanism 8, and the headrest stay 5 is then slid to a desired height. During this sliding, the lock release lever 7 is released and the headrest stay 5 is rotated back together with the lever 7 by the biasing force of the return spring 22. In this state, when the headrest stay 5 is slid and the engagement grooves 20a, 20b of the other stage are opposed to the lock spring 26, both pieces 26a, 26
b is engaged with the engagement grooves 20a and 20b by the biasing force, and the headrest stay 5 is in a locked state at this position. In this way, the headrest body 4
The height can be arbitrarily adjusted in multiple stages.

Note that during this height adjustment, the other headrest stay 6 is attached to the other bracket 2 of the back frame 2a.
9 through the tube body 30 as one headrest stay 5 slides.

Engagement groove 2 of one headrest stay 5 in this example
0a and 20b are formed in the shape of horizontal notches, but if this groove shape is notched in an inclined or arcuate shape on the lower edge side as shown by the two-dot chain line in Fig. 2, the lock can be released during upward sliding. It is possible to slide the head rest stay 5 without rotating it by operating the lever 7.

As described above, according to the present invention, the headrest stay is attached to the headrest main body by screwing the threaded part, so it is easy to assemble, improves work efficiency, and is advantageous in terms of cost. The stay can be rotated in any direction relative to the headrest body, and the operating lever that rotates the headrest stay is fixed to the headrest stay, so the vertical adjustment of the headrest body can be done by rotating the operating lever in any direction. However, since the adjustment can be performed directly with the hand holding the lever, that is, the adjustment operation can be performed with one hand, the operability is extremely good, and the headrest can be easily and quickly adjusted to the desired height.
Moreover, since the lock spring is directly engaged with an engagement groove formed in the headrest stay in the shape of a horizontal notch at least on the upper surface, there is a risk that the headrest may fall unexpectedly even if a load is applied from the upper surface side of the headrest body. Furthermore, when the passenger is not seated, the headrest body can be removed from the seatback side along with the headrest stay, widening the field of view for rear seat occupants, and the seatback can be folded down horizontally. It can also be used for seats, satisfying safety and operability at the same time, and can be used for various types of seats, making it particularly effective when applied to automobile seats.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a vehicle seat equipped with a headrest device according to the present invention, FIG. 2 is a partially cutaway front view of the headrest device according to the present invention, and FIG. 3 is a line A-A in FIG. 2. The enlarged line sectional view and FIG. 4 are exploded perspective views of the main parts. In the figure, 1 is the seat cushion, 2 is the seat back, 2a is the back frame, 4 is the headrest body, 5 is the headrest stay, 7 is the lock release lever, 8 is the holder mechanism, 9 is the frame, 10, 1
6 is a threaded portion, 19 is an engagement pin, 20a, 20b are engagement grooves, 24 is a holder, and 26 is a lock spring.

Claims (1)

[Claims for Utility Model Registration] A short tube having a threaded portion fixed to the head rest main body; and a short tube that is screwed to the threaded portion of the short tube so as to be rotatable in any direction, and at least a headrest stay with a horizontal notch-like engagement groove formed on the upper surface; an operating lever fixed to the headrest stay; and the headrest stay is removably inserted and fixed to the upper part of the seat back frame. comprising a holder and a lock spring attached to the holder and directly engaged with an engagement groove of the headrest stay, the headrest stay screwed to the headrest main body being directly rotated by the operating lever; A headrest device for a vehicle seat or the like, characterized in that the headrest main body is vertically displaceable with respect to the seat bag.