JP3613853B2 - Headrest device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a headrest device that supports a head of a seated person.
[0002]
[Prior art]
Conventionally, as this type of headrest device, one disclosed in Japanese Utility Model Publication No. 4-14045 is known. This includes a stay that is held by the seat back and includes a support portion, and a frame that is supported on the support portion of the stay by a holding member so as to be frictionally engaged with a predetermined friction force. The holding member of the headrest device is attached to the frame, and includes a covering portion that covers the supporting portion so as to be frictionally engageable with the supporting portion, and a pressurizing portion that frictionally engages the covering portion with the supporting portion at a predetermined value. The head support position is normally held by frictional engagement between the support portion of the stay and the covering portion of the holding member, and the frame is against the frictional engagement between the support portion and the covering portion. The head support position is adjusted in the front-rear direction by rotating the stay relative to the stay.
[0003]
[Problems to be solved by the invention]
However, in the case of the above-described conventional device, a resistance force (a resistance of the frame) against the rotation of the frame relative to the stay when the frame is rotated in one direction with respect to the stay and in the other direction. The frictional force between the support portion and the covering portion of the holding member is not variable. For this reason, it is difficult to hold the position if you try to reduce the operating force when adjusting the head support position, and conversely, if you try to make sure the position is maintained, the operation to adjust the head support position will be difficult. There was a fear that the power would be increased.
[0004]
Therefore, an object of the present invention is to vary the resistance force against the rotation of the frame relative to the stay in accordance with the rotation direction of the frame.
[0005]
[Means for Solving the Problems]
The technical means taken in the present invention to solve the above technical problem includes a stay that is supported by a seat back and includes a support portion, and a friction member that is engaged with the support portion of the stay with a predetermined friction force by the holding member. The frame includes a main body part and the holding member extending from a lower edge of the main body part, and the holding member is frictionally engageable with the support part. A covering portion covering the periphery of the support portion, wherein the main body portion and the holding member are offset in a forward direction with respect to the support portion, and the main body portion is provided with the support portion in cooperation with the holding member; A projecting portion is provided to be sandwiched, and the projecting portion is formed to project from the main body portion toward the support portion side, and when the frame rotates in one direction, the covering portion and the support And the frictional engagement between the covering portion and the support portion when the frame rotates in the other direction is less than the predetermined friction force or the predetermined friction force. It is characterized by making it become.
[0006]
According to technical means of this, the support of the covering portion and the frame of the holding member with respect to the stay and a frame when rotated in one direction the frame to stay in the case is pivoted in the other direction The frictional force with the part can be varied. Therefore, it is possible to vary the resistance force that resists the rotation of the frame relative to the stay in accordance with the rotation direction of the frame.
[0007]
More preferably, a fulcrum for elastically deforming the covering portion is provided in the covering portion, and when the frame rotates in one direction due to elastic deformation of the covering portion, the friction engagement between the covering portion and the support portion is performed. It is preferable that the frictional engagement between the covering portion and the support portion is equal to or less than the predetermined friction force or the predetermined friction force when the frame is greater than or equal to a predetermined friction force and the frame is rotated in the other direction. .
[0008]
More preferably, the frame has a main body portion and an extending portion that integrally extends from the main body portion and constitutes the holding member, and the fulcrum is a rib portion formed in the extending portion and the main body portion. It is good to set by.
[0011]
More preferably, the frame has a main body portion and an extending portion that integrally extends from the main body portion and constitutes the holding member, and the fulcrum is a rib portion formed in the extending portion and the main body portion. It is good to set by.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 2, the headrest device 1 supports a head of an occupant seated on a vehicle seat (not shown), and mainly includes a stay 2 and a headrest body 3. . The stay 2 supports the headrest body 3 on a seat back (not shown), and a horizontal bar portion 21 having a substantially circular cross section and a pair of vertical bar portions 22 extending from both ends of the horizontal bar portion 21 are integrated. It has an inverted U shape. The vertical bar portion 22 is supported by the seat back. The headrest body 3 includes a frame 4 and a pad 5. The frame 4 is a rigid body of the headrest device 1, and the pad 5 is a cushion body of the headrest device 1 that covers the frame 4. The pad 5 is insert-molded directly with respect to the frame 4.
[0013]
The frame 4 of the headrest body 3 is made of a single plate material having a rectangular shape, and extends from the main body portion 41 and the upper edge and both side edges of the main body portion 41 and from the lower edge. 43 is integrally formed. The extending part 42 is curled so as to bend toward the rear inner side (the right side in FIG. 2), and the frame 4 is made into a box shape as a whole to eliminate the edge of the frame 4. Thereby, the direct insert molding of the pad 5 to the frame 4 is possible. Further, a bulging portion 432 is formed in the extending portion 43 so as to form a concave portion 431.
[0014]
The pair of horizontal bar portions 21 of the stay 2 is integrally bent with a stopper portion 21 a that continues from the horizontal bar portion 21 and protrudes upward from the central axis of the horizontal bar portion 21.
[0015]
The frame 4 configured in this manner is assembled to the stay 2 by curling the extended portion 43 rearwardly inside (rightward in FIG. 2) so that the extended portion 43 is wound around the horizontal bar 21 of the stay 2. . At this time, the stopper portion 21a is positioned in the concave portion 431 that is opposed to the bulging portion 432 of the extending portion 43 and is blocked by the main body portion 41 by the configuration of the overlapping portion 43b. In addition, the space | interval of the thickness direction of the bulging part 432 of the extension part 43 and the main-body part 41 is large with respect to the thickness of the stopper part 21a. Further, the extending portion 43 is in close contact with the horizontal bar portion 21 so as to be frictionally engaged. Thereafter, the pad 5 is insert-molded with respect to the frame 4 as in the first embodiment. Thereby, the headrest body 3 is rotatably supported by the stay 2.
[0016]
In the headrest device 1 configured as described above, the headrest body 3 is held at the head support position by the frictional force of the extending portion 43 against the stay 2, and the headrest body 3 is held at the frictional force of the support portion 45 against the stay 2. The head support position is adjusted back and forth by rotating the stay 2 with the above force.
[0017]
The front-rear adjustment range of the headrest body 3 is defined as a range until the stopper portion 21a comes into contact with the bulging portion 432 of the extension portion 43 or the body portion 41 by rotation and is restricted from rotating.
[0018]
As shown in FIG. 3, in the assembled state described above, the extended portion 43 is superposed with the substantially circular winding portion 43 a that is in close contact with the horizontal bar portion 21 and frictionally engaged with the main body portion 41. Part 43b. A flange 41a that is inserted into a through hole 43c formed in the overlapping portion 43b and caulked against the overlapping portion 43b is burring at a portion overlapping the overlapping portion 43b of the main body portion 41. By caulking the flange 41a to the overlapping portion 43b, the overlapping portion 43b is pressure-fixed to the main body portion 41, whereby the winding portion 43a is frictionally engaged with the horizontal bar portion 21 with a predetermined frictional force. . The main body portion 41 is formed with a protrusion 41b that protrudes inward. The projecting portion 41b is arranged so as to sandwich the horizontal bar portion 21 in cooperation with the winding portion 43a. With this, when the extended portion 43 is curled to the horizontal bar portion 21, the protruding portion 41b is opposed to the horizontal bar portion 21. Positioning to prevent misalignment is achieved, ensuring stable frictional force in the assembled state.
[0019]
As shown in FIGS. 1 and 2, the main body portion 41 and the extending portion 43 each have a plurality of ribs that extend in the vertical direction (the vertical direction in FIGS. 1 and 2) and project outward. Portions 41c and 43d are projected. Thereby, the strength of the frame 4 is improved and its rigidity is ensured.
[0020]
As shown in FIGS. 2 and 3, the rib portion 41 c of the main body portion 41 and the rib portion 43 d of the extending portion 43 are arranged on the same line so as to face each other. The lower end of the portion 41c and the lower end of each rib portion 43d face each other, and the winding portion 43a of the extending portion 43 is set between the lower ends. Further, the overlapping portion 43b of the extending portion 43 is arranged with a predetermined amount offset in the forward direction (the left direction in FIGS. 2 and 3).
[0021]
In such a configuration, it is rotated in the forward direction (Fig. 2 the counterclockwise direction) the headrest body 3 with respect to the frame 2 in order to adjust the head support position, that they are overlapped portion 43b Gao offset elastically deformed in the direction in which the winding portion 43a is to eliminate the adhesion of the lateral bar portion 21. As a result, the frictional force with respect to the horizontal bar portion 21 of the winding portion 43a becomes a predetermined frictional force or a predetermined frictional force or less. That is, the resistance force against the forward rotation of the headrest body 3 with respect to the stay 2 is reduced. Thereby, the operation force in adjusting the head support position is reduced, and the operability is improved. Further, when the headrest device 1 supports the seated person's head, the headrest body 3 tends to rotate backward (clockwise in FIG. 2). At this time, winding portion 43a by being overlapped portion 43b Gao offset is elastically deformed in a direction to be close contact with the cross bar portion 21. As a result, the frictional force with respect to the horizontal bar portion 21 of the winding portion 43a is equal to or greater than the predetermined frictional force. That is, the resistance force against the backward rotation of the headrest body 3 with respect to the stay 2 increases. As a result, the position of the head support position is reliably maintained.
[0023]
【The invention's effect】
According to the present invention, since the arrangement of the pressurizing unit is set, the holding member can be moved when the frame is rotated in one direction with respect to the stay and when the frame is rotated in the other direction with respect to the stay. The frictional force between the covering portion and the frame support portion can be varied. Thereby, the above-described technical problem can be solved. That is, the resistance force that resists the rotation of the frame relative to the stay can be varied corresponding to the rotation direction of the frame.
[Brief description of the drawings]
FIG. 1 is a plan view of a headrest device according to the present invention.
FIG. 2 is a side view of FIG.
3 is a cross-sectional view taken along the line CC in FIG. 1. FIG.
[Explanation of symbols]
2 stay 4 frame A fulcrum 21 horizontal bar part (support part)
41 Main body part 43 Extension part (holding member)
43a Winding part (covering part)
43b Polymerization part (pressure part)
41c, 43d rib part

Claims (1)

In a headrest device comprising: a stay that is supported by a seat back and includes a support portion; and a frame that is supported by the support member so as to be frictionally engaged with the support portion by a predetermined friction force.
The frame includes a main body part and the holding member extending from a lower edge of the main body part,
The holding member includes a covering portion that covers the periphery of the support portion so as to be frictionally engageable with the support portion.
The main body portion and the holding member are offset in a forward direction with respect to the support portion,
The main body portion is provided with a protrusion that sandwiches the support portion in cooperation with the holding member,
The protrusion is formed to protrude from the main body part toward the support portion side,
When the frame rotates in one direction, the frictional engagement between the covering portion and the support portion becomes greater than or equal to the predetermined frictional force, and when the frame rotates in the other direction, the cover portion and the support portion A headrest device characterized in that the frictional engagement is equal to or less than the predetermined frictional force or the predetermined frictional force.

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