JPS6239746Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a movable headrest device, and more particularly to a movable headrest device whose inclination angle can be freely changed.

[Conventional technology and problems to be solved]

As a headrest device, especially a movable headrest device in which the headrest can be tilted back and forth,
Various things have been implemented. For example, it has become common to have a headrest rotatably attached to a support stay, and a locking mechanism for restricting this rotation provided on the headrest. In this conventional example, in order to change the inclination angle of the headrest, the lock mechanism that restricts the rotation of the headrest must be released, and then the headrest must be moved by hand to change the inclination angle, which is inconvenient. be. In addition, since the tilted position of the headrest changes after the lock mechanism is released, it is difficult for the seater to operate the headrest while maintaining the seated posture.Furthermore, when adjusting the tilted position of the headrest, shocks may be applied to the seat. According to this report, the headrest moved carelessly and was no longer able to protect the head, which is the original function of the headrest, which was dangerous. In addition, another conventional example is JP-A-54-
The one described in Publication No. 127762 is known. In this case, a pinion gear meshes with a sector gear fixed to a stay, and this pinion gear has a reverse rotation prevention function. Therefore, since the retention of the headrest depends only on the meshing between the sector gear and the pinion gear, there is a risk that the meshing will be damaged when a strong impact is applied to the headrest, resulting in serious consequences.

The present invention was developed in view of the above-mentioned conventional circumstances, and it is possible to freely change the inclination angle, and the lock state is maintained by the meshing of the two points against external forces other than the operation of adjusting the inclination angle. An object of the present invention is to provide a movable headrest device that can be more reliably maintained.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention includes a gear having one end of a shaft that rotates with the gear, the shaft being rotatably attached to a frame, and a lock gear through which the shaft is rotatably inserted into the frame. The center of the adjusting member, which is fixed and has a long hole bored at the other end of the shaft, is fixed, and a retaining member that is not inserted into the shaft is installed inside the adjusting member, and the tip of the adjusting member is fixed between the retaining member and the adjusting member. A pair of locking members that are always engaged with the locking gear are rotatably attached to the shaft using a spring or the like, and the locking members are rotated against the biasing force of the spring or the like to release the engagement between the locking gear and the locking member. A rotating member having a pin for locking is rotatably attached, and the pin is positioned near the locking member through an elongated hole.

〔Example〕

The present invention will be explained below with reference to the illustrated embodiments.

In the movable headrest device 10 of the present invention shown in FIG. 1, a headrest body 1 is supported by a stay 3 inserted into the backrest 2 of the seat, and a knob 4 attached to the side of the headrest body 1 supports the headrest body 1. By rotating the headrest body 1, the inclination angle of the headrest body 1 can be changed. If you turn knob 4, this rotation will cause knob 4 to rotate.
and the third frame provided between the headrest frame and the headrest frame.
The rotation is transmitted through the rotation adjustment mechanism 5 shown in the figure to a gear 6 provided in the headrest main body 1 shown in FIG. 2, and the inclination angle of the headrest main body 1 is adjusted by the rotation of this gear 6. . The rotation adjustment mechanism 5 will be described later, and first, an example of a mechanism for adjusting the inclination angle of the headrest body 1 will be described with reference to FIG. 2.

A guide member 7 is fixed to the upper end of the stay 3 inserted into the backrest portion 2. This guide member 7 has meshing teeth 71 that are slightly curved as a whole on the side opposite to the stay 3, and the lower ends of link plates 8, 8' are rotatably attached to both ends that sandwich the stay 3. It is being The upper ends of the link plates 8, 8' are rotatably attached to a bracket 12 fixed to a headrest frame 11 constituting the headrest main body 1. Further, a gear 6 meshes with the meshing teeth 71 of the guide member 7, and this gear 6
is attached to the rotation adjustment mechanism 5 on the outside of the headrest frame 11. The gear 6 is connected to the rotation adjustment mechanism 5 by a shaft 9 that rotates together with the gear 6, and the gear 6 is connected to the head rest frame 1.
When the gear 6 moves on the guide member 7, the head rest frame 11 moves together with the gear 6 and connects the link plates 8, 8'. It rotates using the connection part with the guide member 7 as a rotation fulcrum.

Next, the rotation adjustment mechanism 5 for rotating the gear 6 will be explained with reference to FIG. The gear 6 in the head rest frame 11 has a cylindrical spacer 62 with a substantially rectangular fitting hole 61 formed in the center.
is fixed by welding or the like, and one end of the shaft 9 is fitted into the fitting hole 61, so that the shaft 9 and the gear 6 rotate together. In addition, the shaft 9 is connected to the head rest frame 11 from the gear 6 side.
The headrest frame 11 has a lock gear 70 formed with triangular chevron teeth.
The shaft 9 passes through the center hole 71 of the lock gear 70. The middle part of the shaft 9 is a ring part 9a having a larger diameter than both end sides, and this ring part 9a is formed to have a larger diameter than the center hole 71 of the lock gear 70.
It is in contact with 0. Further, on the opposite side of the ring portion 9a from the lock gear 70, a disc-shaped adjustment member 80 is provided.
The center of is fixed. The adjustment member 80 includes
Curved elongated holes 82 and 83 are bored through the insertion hole 81 at opposing positions. The elongated holes 82 and 83 are formed concentrically with the adjustment member 80, and the elongated hole 83 is formed to have a larger width. Also, the adjustment member 80
On the opposite side of the long hole 82 from the insertion hole 81, there is a small hole 84,
85 is bored, and rod-shaped locking members 86, 87 are rotatably attached to the small holes 84, 85. Perpendicular rotation shafts 86a, 87a are integrally formed at the base ends of the lock members 86, 87, and one end of the rotation shafts 86a, 87a is connected to the small holes 84, 87a.
5 is rotatably fitted. Furthermore, the rotation axis 8
The other ends of 6a and 87a fit into small holes 88a and 88b drilled in the curved holding member 88, and the holding member 8
8 is attached to the adjustment member 80 by screws or the like, and lock members 86 and 87 are held between the adjustment member 80 and the holding member 88. The lock members 86 and 87 arranged in this manner are positioned such that their tips mesh with the lock gear 70, and are arranged so as to constantly mesh with the lock gear 70 by means of a spring or the like. There is. Further, a disk-shaped rotating member 90 is rotatably inserted through the shaft 9. Pins 91 and 92 and a thick-shafted pin 93 are fixed to the rotating member 90, and are arranged so that the pins 91 and 92 are located in the elongated hole 82 and the pin 93 is located in the elongated hole 83, respectively. Pins 91, 9 of rotating member 90
A beam member 94 is fixed to the side opposite to 2, 93, and the knob 4 is fixed to this beam member 94.
When the knob 4 is rotated, a rotating member 90 is also rotated.

The operation of the movable headrest device 10 configured as described above, particularly the rotation adjustment mechanism 5, will be explained. The state of the rotation mechanism 5 schematically shown in FIG. 4A is a state in which the knob 4 is not rotated.
The inclination angle of the headrest main body 1 is maintained and fixed at a predetermined angle. When the headrest main body 1 is to be tilted forward from this state, the knob 4 is first rotated counterclockwise to give the rotation member 90 a counterclockwise rotation. When the rotating member 90 rotates, the pins 91, 92, and 93 also rotate counterclockwise. When the pin 91 rotates counterclockwise, it pushes the lock member 86 and disengages the lock member 86 from the lock gear 70 (see FIG. 4B). The pin 91 that has pushed the lock member 86 comes into contact with the end of the elongated hole 82, but the pins 91 and 93 are moved so that the pin 93, which was rotating together with the pin 91, also comes into contact with the end of the elongated hole 83. It is arranged. This lock member 86 and lock gear 7
Knob 4 is further removed from the state where the engagement with 0 is released.
When you turn the adjustment member 80, it is pushed by the pins 91 and 93.
It also rotates. When the adjustment member 80 is rotated counterclockwise, the lock member 87 moves around the lock gear 70 while repeating the operation of overcoming the triangular chevron teeth of the lock gear 70 and meshing with the next tooth, thereby completing the adjustment. The member 80 can be rotated counterclockwise. The adjusting member 80 has a shaft 9
is fixed and rotates counterclockwise together with the adjustment member 80, causing the gear 6 to rotate counterclockwise together with the shaft 9. When the gear 6 is rotated counterclockwise, the gear 6 moves on the guide member 7 and the headrest main body 1 is tilted forward.

To tilt the headrest main body 1 backward, rotate the knob 4 clockwise to rotate the rotating member 90 clockwise, and by this rotation, the locking member 8
7 with the pin 92 to release the engagement with the lock gear 70, and also rotate the adjusting member 80 in the clockwise direction, thereby rotating the shaft 9 (see Fig. 4C). . The rotation of the shaft 9 is transmitted to the gear 6, and the gear 6 moves backward on the guide member 7, causing the headrest body 1 to tilt backward. When the knob 4 is released, the rotating member 90 is returned by a force such as a spring that keeps the lock members 86 and 87 in mesh with each other, and both of the lock members 86 and 87 mesh with the lock gear 70.

In the above embodiment, the mechanism shown in FIG. 2 was explained as a mechanism for adjusting the inclination of the headrest main body. You may also try tilting it.

〔effect〕

In the present invention constructed as described above, the locking gear fixed to the frame and the pair of locking members mesh with each other, thereby increasing reliability during locking, and even if an impact is applied to the headrest, the guide member and the gears will remain in contact with each other. The headrest can be reliably supported at the locations where the lock gear and the lock member engage with each other. Furthermore, the present invention also allows for fine adjustment of the inclination angle of the headrest, thereby providing greater safety than the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a side view of a headrest showing an embodiment of the present invention, Fig. 2 is a partially omitted sectional view of the headrest, Fig. 3 is an exploded perspective view of the rotation adjustment mechanism, and Fig. 4 shows that the headrest is When locked, B When leaning forward, C
FIG. 6 is a simplified front view illustrating the action of the rotation adjustment mechanism when tilting backward. 1...Head rest (main body), 3...Stay,
4... Knob, 6... Gear, 7... Guide member, 9
... Shaft, 10... Movable head rest device, 11... (Head rest) frame, 70...
... Lock gear, 80 ... Adjustment member, 82 ... Long hole, 86, 87 ... Lock member, 88 ... Holding member, 90 ... Rotating member, 91, 92 ... Pin.

Claims (1)

[Claims for Utility Model Registration] A gear 6 is attached to a predetermined position of the frame 11 constituting the head rest 1, and a guide member 7 meshes with the gear 6 on the stay 3 that supports the head rest 1.
, and rotate the gear 6 to rotate the guide member 7.
In a movable headrest device that changes the inclination angle of the headrest 1 with respect to the stay 3 by moving the top, a shaft 9 that rotates together with the gear 6 is attached to the gear 6.
The shaft 9 is rotatably attached to the frame 11, a lock gear 70 through which the shaft 9 is rotatably inserted is fixed to the frame 11, and a long hole 82 is bored at the other end of the shaft 9. A holding member 88 that is not inserted into the shaft 9 is attached to the inside of the adjusting member 80, and its tip is always locked by a spring or the like between the holding member 88 and the adjusting member 80. 2 meshing with 70
A pair of lock members 86 and 87 are rotatably attached, and the lock members 86 and 87 are rotated against the urging force of a spring or the like on the shaft 9 to release the mesh between the lock gear 70 and the lock members 86 and 87. pin 91,9
2 is rotatably mounted, and the pins 91 and 92 are located near the lock members 86 and 87 through the elongated holes 82, so that the pins 91 and 92 do not come into contact with the lock members 86 and 87. At this time, both the lock members 86 and 87 are engaged with the lock gear 70 by a spring or the like, so that the gear 6
The lock member 86 and the lock gear 7 are prevented from rotating, and the rotating member 90 is rotated in one direction so that the pin 91 comes into contact with the lock member 86 and rotates.
0 to allow the shaft 9 and gear 6 to rotate in one direction, and rotate the rotating member 90 in the other direction to bring the pin 92 into contact with the lock member 87 and rotate it. A movable headrest device configured to release the engagement between the lock member 87 and the lock gear 70 and allow the shaft 9 and the gear 6 to rotate in the other direction.