JP2016215929A - Headrest stay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a slide resistance of a headrest stay by reducing a contact area of the headrest stay with a headrest support while maintaining a bearing power of the headrest stay by the headrest support in a headrest of which a height can be freely controlled.SOLUTION: On an outer peripheral surface of a headrest stay 40 which is inserted into a headrest support 30, plural projections 43, which partially project towards a tube-shaped inner surface of the headrest support 30 and extend in an insertion direction over the whole insertion area of the headrest stay 40 into the headrest support 30, are formed. The headrest stay 40, which is inserted into the headrest support 30, is supported in such a manner that the projections 43 are brought into contact with the inner surface of the headrest support 30.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a headrest stay for an occupant seat for mounting on a vehicle such as an automobile, an airplane, a ship, and a train.

  In an automobile seat, a headrest that supports the head of the seated occupant from the rear is attached to the top of the seat back that supports the back of the seated occupant from the rear by the headrest stay so that the vertical height can be adjusted. Here, the headrest stay is an inverted U-shaped pipe, a bent portion at the top thereof is integrally fixed to the headrest, and a pair of left and right leg portions at the bottom thereof are embedded and fixed at the top of the seat back. It is inserted into the shape headrest support and is supported so that the vertical height can be adjusted. Therefore, the headrest stay is slidably received with respect to the headrest support. The configuration of such a headrest is disclosed in Patent Document 1 below.

Japanese Patent Laid-Open No. 2003-11708

  By the way, the sliding resistance of the headrest stay with respect to the headrest support at the time of adjusting the height of the headrest is large, and the operation load for adjusting the height is large. Therefore, it has been practiced to apply the silicone oil to the surface of the headrest stay to suppress the sliding resistance. However, when the headrest is adjusted to a relatively high position, the headrest stay is exposed on the top of the seat back, and the body or clothes of the occupant may come into contact therewith, which may be contaminated by silicon oil.

  In view of such a problem, an object of the present invention is to reduce the contact area of the headrest stay with respect to the headrest support while maintaining the support force of the headrest stay by the headrest support in the headrest that is adjustable in height. This is to suppress the sliding resistance of the headrest stay against the above.

  The first invention supports the seat back of the vehicle seat that supports the back of the seated occupant of the vehicle seat from the rear, and the headrest that supports the head of the seated occupant from the rear in a freely adjustable height. A headrest stay integrated with the headrest in the form of a rod that is inserted into the substantially tubular headrest support provided, and the outer peripheral surface inserted into the headrest support of the headrest stay is directed toward the tubular inner surface of the headrest support A plurality of protrusions extending in the insertion direction over the entire region where the headrest stay is inserted into the headrest support, and the headrest stay inserted into the headrest support is in contact with the inner surface of the headrest support. Supported.

  According to the first invention, in a state where the headrest stay is inserted into the headrest support, the protruding portion of the headrest stay abuts against the inner surface of the headrest support and the headrest stay is supported by the headrest support. Therefore, the supporting force of the headrest stay can be maintained, and the headrest stay is not in contact with the headrest support at a portion other than the protruding portion, and the contact area between the two is reduced. Thereby, sliding resistance of the headrest stay with respect to the headrest support can be suppressed.

  According to a second aspect of the present invention, in the first aspect, the headrest stay has a cross-sectional shape in a direction intersecting with the direction of insertion into the headrest support such that the longitudinal dimension of the vehicle seat is larger than the lateral dimension.

  According to the second aspect of the present invention, since the front-rear dimension of the headrest stay is larger than the left-right dimension, the left-right width of the headrest stay is reduced as the headrest stay while maintaining the front-rear strength of the vehicle seat. The field of view through the stay gap can be widened.

  In a third aspect based on the first aspect or the second aspect, the projecting portion is formed at a front-rear direction end portion of the vehicle seat of the headrest stay.

  According to the third aspect, since the protrusion is formed at the front-rear direction end of the headrest stay, the front-rear dimension of the headrest stay can be increased by the amount of the protrusion. Therefore, the strength in the front-rear direction of the headrest stay required for the vehicle seat can be increased.

  According to a fourth invention, in any one of the first to third inventions, between the headrest stay and the headrest support, the insertion position of the headrest stay into the headrest support is held at a predetermined position, and the headrest height is predetermined. A lock mechanism is provided to maintain the height, and the lock mechanism is provided on the headrest support side and is urged so as to protrude toward the headrest stay, and the protrusion amount is arbitrarily suppressed against the urging force. A claw, and an engaging groove that is provided on the headrest stay side and that holds the insertion position of the headrest stay into the headrest support by receiving the protruding claw, wherein the engaging groove is adjacent to the protruding portion. It is provided at a position sandwiched between them.

  According to the fourth aspect of the present invention, since the engagement groove of the lock mechanism is provided at a position sandwiched between the protrusions, the engagement groove is disposed away from the inner surface of the headrest support. Therefore, the corner formed at the end of the engagement groove at the time of forming the engagement groove does not interfere with the inner surface of the headrest support, and an increase in sliding resistance associated with the interference can be avoided.

  According to a fifth aspect of the present invention based on the fourth aspect, the portion of the headrest stay sandwiched between the adjacent protrusions is formed by a flat surface perpendicular to the protrusion direction of the claw of the lock mechanism, and the engagement The groove is formed on the flat surface.

  According to the fifth invention, since the engaging groove is formed on the flat surface, the groove depth of the engaging groove can be made substantially the same as that of the central portion at the end of the engaging groove. The engagement strength when the claw is engaged with can be increased.

1 is a perspective view of an automobile seat to which a first embodiment of the present invention is applied. FIG. 3 is an enlarged perspective view of a headrest to which the first embodiment is applied. It is an enlarged front view of a 1st embodiment. It is an enlarged side view of a 1st embodiment. It is the VV sectional view arrow enlarged view of FIG. It is sectional drawing corresponding to FIG. 5 of 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 5 of 3rd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. It is sectional drawing corresponding to FIG. 5 of 4th Embodiment of this invention. It is sectional drawing corresponding to FIG. 5 of 5th Embodiment of this invention.

  FIG. 1 shows an automotive seat (hereinafter simply referred to as a seat) 1 to which a headrest stay (hereinafter simply referred to as a stay) 40 according to a first embodiment of the present invention is applied. FIG. 2 shows only the headrest 4 portion in an enlarged manner, and FIGS. 3 and 4 show only the stay 40 in an enlarged manner. In each figure after FIG. 1, each direction in the state which mounted | wore the vehicle with the sheet | seat 1 is shown by the arrow. In the following description, the description regarding the direction is made based on this direction.

  The seat 1 is formed by combining a seat cushion 2 that supports the weight of the seated occupant and a seat back 3 that supports the back of the seated occupant from the rear. The headrest 4 to be supported is attached by a stay 40 so that the vertical height can be adjusted. Here, the stay 40 is an inverted U-shaped pipe, its upper bent portion 41 is integrally fixed to the headrest 4, and a pair of left and right leg portions 42 are embedded in the top of the seat back 3. It is inserted into a fixed tube-shaped headrest support (hereinafter simply referred to as a support) 30 and supported so that the vertical height can be adjusted.

  A lock mechanism is provided between the leg portion 42 of the stay 40 and the support 30 so that the stay 40 can be adjusted in vertical height with respect to the support 30. This locking mechanism mainly includes a claw 33 (see FIG. 8) provided on the support 30 side and an engagement groove 46 provided by cutting a groove on the surface of the stay 40. The claw 33 is urged so that the end portion of the plate-like body protrudes toward the leg portion 42 of the stay 40, and by pressing a push button 32 provided adjacent to the flange portion 31 of the support 30. It is moved away from the leg 42 against the urging force. On the other hand, the engaging groove 46 receives the end of the protruding claw 33 to hold the insertion position of the leg portion 42 into the support 30 at a predetermined position and hold the headrest height at a predetermined height. As shown in FIGS. 3 and 4, the engagement groove 46 is formed on the right side surface of the left leg portion 42 so as to straddle between adjacent protrusions 43 (described later). 46 is provided at a position opposite to 46.

  The stay 40 is formed by bending a pipe-shaped extruded material formed by aluminum extrusion at a bent portion 41. As shown in FIG. 5, the stay 40 is a pipe having an elliptical cross-sectional shape. On the outer peripheral surface of the ellipse, a protruding portion 43 protruding outward is an extrusion direction of the extruded material, that is, a leg portion 42. And extending in the longitudinal direction (insertion direction to the support 30). Eight protrusions 43 are formed on the circumference at substantially equal intervals.

  Thus, since the protrusion 43 is provided on the outer surface of the stay 40, the protrusion 43 of the leg 42 abuts against the inner surface of the support 30 when the leg 42 of the stay 40 is inserted into the support 30. The leg portion 42 is supported with respect to the support 30. Therefore, the support force of the stay 40 can be maintained, and the leg portion 42 does not come into contact with the support 30 at a portion other than the protruding portion 43, and the contact area between the two is reduced. Thereby, sliding resistance of the leg part 42 with respect to the support 30 can be suppressed.

  Further, the leg portion 42 of the stay 40 has an elliptical cross-sectional shape and a front-rear direction dimension larger than the left-right direction dimension. The field of view through the gap of the leg portion 42 can be widened by narrowing the width. The headrest 4 supports from behind the head of the seated occupant that the head of the seated occupant falls backward during a rear-end collision of the automobile, and the stay 40 mainly receives a load in the front-rear direction. Therefore, it is important for the headrest that the strength of the stay 40 in the front-rear direction is maintained as in the first embodiment.

  FIG. 6 shows a second embodiment of the present invention. The feature of the second embodiment with respect to the first embodiment is that the arrangement and shape of the protrusion 43 on the surface of the stay 40 are changed. The other points are the same, and the repetitive description of the same parts is omitted.

  Six protrusions 43 in the second embodiment are provided on the outer peripheral surface of the stay 40, and two of them are formed at both ends of the stay 40 in the front-rear direction.

  According to the second embodiment, since the protrusions 43 are formed at both ends of the stay 40 in the front-rear direction, the dimension of the stay 40 in the front-rear direction can be increased by the amount of the protrusion 43. Therefore, it is possible to increase the strength in the front-rear direction of the stay 40 that is highly necessary as described above.

  FIG. 7 shows a third embodiment of the present invention. The third embodiment is characterized in that the arrangement and shape of the protrusion 43 on the surface of the stay 40 are changed, and the flat portion 44 is formed on the right side on the surface of the stay 40. It is. The other points are the same, and the repetitive description of the same parts is omitted.

  As in the second embodiment, six protrusions 43 in the third embodiment are provided on the outer peripheral surface of the stay 40, and two of them are formed at both ends in the front-rear direction of the stay 40.

  The flat portion 44 is a portion sandwiched between the protrusions 43 adjacent to each other, and is formed by a flat surface perpendicular to the protrusion direction of the claw 33 of the lock mechanism by partially reducing the thickness of the pipe. Yes. In the third embodiment, as shown in FIG. 8, the engagement groove 46 of the lock mechanism is formed on the flat portion 44.

  According to the third embodiment, as in the case of the second embodiment, the protrusions 43 are formed at both ends of the stay 40 in the front-rear direction, so that the strength in the front-rear direction of the stay 40 can be increased. Further, since the engagement groove 46 of the lock mechanism is provided in the flat portion 44 formed by partially reducing the thickness of the pipe, the engagement groove 46 is disposed away from the inner surface of the support 30. The Therefore, the corner 46a (see FIG. 8) formed at the end of the engagement groove 46 does not interfere with the inner surface of the support 30 when the engagement groove 46 is formed, and an increase in sliding resistance due to the interference is avoided. can do. Moreover, the flat portion 44 is a flat surface orthogonal to the protruding direction of the claw 33 of the locking mechanism, and the engaging groove 46 of the locking mechanism is formed in the flat portion 44. The depth of the engagement groove 46 can be substantially the same as that of the central portion, and the engagement strength when the claw 33 is engaged with the engagement groove 46 can be increased. Incidentally, when the engaging groove 46 is formed on the outer peripheral arc surface of the leg portion 42 of the stay 40, the groove depth at the end of the engaging groove 46 becomes shallower than the central portion of the engaging groove 46, The engagement strength of the claw 33 is weakened.

  FIG. 9 shows a fourth embodiment of the present invention. The feature of the fourth embodiment with respect to the first embodiment is that the arrangement and shape of the protrusion 43 on the surface of the stay 40 are changed. The other points are the same, and the repetitive description of the same parts is omitted.

  The protrusions 43 in the fourth embodiment are formed at both end portions of the stay 40 in the front-rear direction by forming recesses 45 on both the left and right sides of the outer peripheral surface of the stay 40.

  In this way, the recesses 45 are formed on the left and right sides of the outer surface of the stay 40, and both end portions in the front-rear direction of the stay 40 other than the recess 45 are the protrusions 43. Therefore, in a state where the leg portion 42 of the stay 40 is inserted into the support 30, the protruding portion 43 abuts on the inner surface of the support 30 and the leg portion 42 is supported with respect to the support 30. As a result, the support force of the stay 40 can be maintained, and the recess 45 of the leg portion 42 does not contact the support 30 and the contact area between the two is reduced. Thereby, sliding resistance of the leg part 42 with respect to the support 30 can be suppressed. Further, since the protrusions 43 are formed in a wide range at both ends in the front-rear direction of the stay 40, the strength in the front-rear direction of the stay 40 required for the seat 1 can be increased.

  In the fourth embodiment, the engagement groove 46 of the lock mechanism is formed in the concave portion 45 on the right side of the leg portion 42. That is, it is provided at a position sandwiched between the protrusions 43 adjacent to each other. Therefore, the engaging groove 46 is disposed away from the inner surface of the support 30, and the corner 46 a (see FIG. 8) at the end of the engaging groove 46 does not interfere with the inner surface of the support 30. An increase in sliding resistance due to interference can be avoided.

  FIG. 10 shows a fifth embodiment of the present invention. The feature of the fifth embodiment over the fourth embodiment (see FIG. 9) is that a recess 47 is formed at the front and rear end of each protrusion 43 formed at both ends of the stay 40 in the front and rear direction. Is a point. The other points are the same, and the repetitive description of the same parts is omitted.

  Thus, since the recessed part 47 is each formed in the front-back direction edge part of each protrusion part 43, compared with the stay 40 of 4th Embodiment, the contact area with respect to the support 30 of the leg part 42 can be decreased. Further, the sliding resistance of the leg portion 42 with respect to the support 30 can be further suppressed.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, in the above embodiments, the cross-sectional shapes of the stay 40 and the support 30 are elliptical, but they may be circular or polygonal. Moreover, in each said embodiment, although the stay 40 was formed with the pipe-shaped pipe, you may form with a solid rod. Furthermore, in the said 2nd and 3rd embodiment, although the protrusion part 43 was formed in the both ends of the front-back direction of the stay 40, respectively, it is good also as only either one side of front and back. Furthermore, in each of the above-described embodiments, the present invention is applied to an automobile seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like.

1 Car Seat 2 Seat Cushion 3 Seat Back 4 Headrest 30 Headrest Support (Support)
31 Flange part 32 Push button 33 Claw 40 Headrest stay (stay)
41 Bent part 42 Leg part 43 Projection part 44 Flat part 45, 47 Concave part 46 Engaging groove 46a Corner part

Claims (5)

The seat back for the vehicle seat that supports the back of the seated occupant of the vehicle seat, and the headrest that supports the head of the seated occupant from the rear are supported in a freely adjustable height. A headrest stay integrated with the headrest in the form of a rod inserted into a tubular headrest support,
On the outer peripheral surface inserted into the headrest support of the headrest stay, a plurality of protrusions are formed that partially protrude toward the tube-shaped inner surface of the headrest support and extend in the insertion direction over the entire insertion area of the headrest support. And
The headrest stay inserted into the headrest support is a headrest stay in which the protruding portion is supported in contact with the inner surface of the headrest support. In claim 1,
The headrest stay is a headrest stay whose cross-sectional shape in a direction intersecting the direction of insertion into the headrest support is such that the longitudinal dimension of the vehicle seat is larger than the lateral dimension. In claim 1 or 2,
The protrusion is a headrest stay formed at a front-rear direction end of a vehicle seat of the headrest stay. In any of claims 1 to 3,
Between the headrest stay and the headrest support, there is provided a lock mechanism for holding the insertion position of the headrest stay into the headrest support at a predetermined position and holding the headrest height at the predetermined height.
The locking mechanism is
A claw provided on the headrest support side, biased so as to protrude toward the headrest stay, and arbitrarily restraining the protruding amount against the biasing force;
An engaging groove that is provided on the headrest stay side and holds the insertion position of the headrest stay into the headrest support by receiving the protruding claw;
The engagement groove is a headrest stay provided at a position sandwiched between the protrusions adjacent to each other. In claim 4,
The portion sandwiched between the protrusions adjacent to each other of the headrest stay is formed by a flat surface orthogonal to the protrusion direction of the claw of the lock mechanism,
The engagement groove is a headrest stay formed on the flat surface.

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