JP4546673B2 - Headrest pole and its locking groove forming tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a headrest pole attached to a headrest and a lock groove forming tool thereof.
[0002]
[Prior art]
FIG. 10 shows a conventional vehicle seat S. The seat cushion 52 is attached to the vehicle body, the seat back 54 is attached to the seat cushion 52 so as to be tiltable, and is attached to the upper end of the seat back 54 so as to be movable up and down. The headrest 56 is provided.
[0003]
As shown in FIG. 11, the headrest 56 includes a cushion member 58 and a substantially inverted U-shaped headrest pole 60 that supports the cushion member 58, and both leg portions 60 a of the headrest pole 60 are provided on the seat back 54. The pole guide 62 is detachably inserted.
[0004]
A plurality of lock grooves 64 for holding the headrest 56 at a desired height are formed at predetermined intervals in the axial direction on one outer peripheral surface of both leg portions 60a of the headrest pole 60.
[0005]
A solid round bar is used as the headrest pole 60, and the lock groove 64 is formed by cutting the round bar. In addition, since cutting of a round bar takes a lot of manufacturing steps, recently, as shown in Japanese Patent Laid-Open No. 4-367344, a pipe material is used for the headrest pole 60, and a notch formed in the pipe material by press working is used. There has also been proposed a processing method in which the is used as a lock groove.
[0006]
Further, as a punch used for forming a notch in a pipe material, a punch 66 shown in FIG. 12 and a punch 68 shown in FIG. 13 have been proposed (see, for example, Japanese Utility Model Laid-Open No. 2-118615). .
[0007]
[Problems to be solved by the invention]
However, as shown in FIG. 12 or FIG. 13, when molding is performed using punches 66 and 68 having flat tips, as shown in FIG. 14, the lock groove required by the pipe material that becomes the headrest pole 60. If the punch width Y1 is wider than the width dimension X of the bottom surface portion 64, the excess thickness 60b protrudes from the outer periphery of the pipe material, the headrest pole 60 interferes with the pole guide 62, and smoothly slides along the pole guide 62. There was a problem that it could not move.
[0008]
On the contrary, as shown in FIG. 15, when the punch width Y2 is equal to or narrower than the required width dimension X of the bottom surface of the lock groove 64, both ends of the lock groove 60c formed on the outer peripheral surface of the pipe material. A convex portion 60d is formed on the surface. When this pipe material is used as the headrest pole 60, the lock member 70 provided on the pole guide 62 does not fall down to the bottom of the lock groove 60c but comes into contact with the convex portion 60d, and the fitting is insufficient, and the headrest 56 is secured. In the past, it could not be used as a pole groove for a headrest.
[0009]
The present invention has been made in view of such problems of the prior art, and can be smoothly slid with respect to the pole guide, and can securely hold (lock) the headrest at a desired position. It is an object of the present invention to provide a headrest pole and a lock groove forming tool that can be used.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present invention is a headrest pole attached to a headrest, comprising a plurality of lock grooves formed at predetermined intervals in a pipe material, Each of the plurality of lock grooves has a flat bottom surface portion and concave portions formed on both sides of the bottom surface portion.
[0011]
The invention according to claim 2 is characterized in that in some of the plurality of lock grooves, a flat side surface portion is formed above the bottom surface portion, and an inclined portion is formed below the bottom surface portion. And
[0012]
The invention according to claim 3 is characterized in that flat side portions are formed above and below one of the plurality of lock grooves.
[0013]
Furthermore, the invention described in claim 4 is a lock groove forming tool for a headrest pole attached to the headrest, and is provided between two protrusions provided on both sides of the tip pressing portion and between the two protrusions. And a relief portion provided.
[0014]
According to a fifth aspect of the present invention, the tip pressing portion has a substantially semicircular cross-sectional shape, and an inclined portion is formed on one side of the protruding portion and the relief portion.
[0015]
The invention described in claim 6 is characterized in that the tip pressing portion is formed in a flat plate shape.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a method for forming a lock groove of a headrest pole according to the present invention. A pipe material 4 cut to a predetermined length used as a headrest pole is placed on an anvil 2 to form a lock groove forming tool. A plurality of lock grooves 4 a and 4 b are formed in the pipe material 4 by a plurality of punches 6 and 8.
[0017]
In the example of FIG. 1, four punches 6 and 8 are used, and among the four punches 6 and 8, the punches 6 for forming the three lock grooves 4 a from the top of the pipe material 4 have the same shape. Thus, the punch 8 for forming the lowermost lock groove 4b is different in shape from the other punches 6, and the reason will be described later.
[0018]
As shown in FIG. 1, when forming the lock grooves 4 a and 4 b in the pipe material 4, the punches 6 and 8 integrally held in the punch holder 10 are formed in the punch guide 12 at equal intervals. Are inserted into the insertion holes 12a and 12b. An arcuate recess 12c having substantially the same shape as the abutting portion of the pipe material 4 is formed in a portion of the lower surface of the punch guide 12 that abuts the pipe material 4 (a portion where the insertion holes 12a and 12b are formed). After inserting the corresponding part of the pipe material 4 into the arcuate recess 12c, the lock grooves 4a and 4b are formed by pressing the punches 6 and 8 against the pipe material 4.
[0019]
Similar to the punch guide 12, an arcuate recess for accommodating the pipe material 4 is formed on the upper surface of the anvil 2, and the pressure applied to the pipe material 4 can be dispersed by pressing.
[0020]
2 and 3 show the punch 6, the tip of which has a substantially semicircular cross-sectional shape. Further, the pressing portion formed at the tip includes two protruding portions 6a formed on both sides, a relief portion 6b provided between the two protruding portions 6a, and one side of the protruding portion 6a and the relief portion 6b. And the upper end of the inclined portion 6c is flush with the escape portion 6b. Moreover, the width W1 (refer FIG.3 (c)) of the two projection parts 6a is set smaller than the diameter of the pipe material 4 shape | molded.
[0021]
4 and 5 show the punch 8, the tip of which is formed in a flat plate shape. Further, the pressing portion formed at the tip portion includes two protruding portions 8a formed on both sides, and a relief portion 8b provided between the two protruding portions 8a, and there is no inclined portion. This is different from punch 6. Further, the width W2 (see FIG. 5C) of the two protrusions 8a is set smaller than the diameter of the pipe material 4 to be molded, and is substantially the same as the width W1 of the two protrusions 6a provided on the punch 6. Are the same.
[0022]
After a plurality of lock grooves 4a and 4b are formed on the pipe material 4 cut to a predetermined length using the punches 6 and 8 having the above-described shape, the pipe material 4 is bent as shown in FIG. Used as a headrest pole.
[0023]
Here, the shape of the lock grooves 4a and 4b formed in the pipe material 4 will be described with reference to FIGS.
[0024]
As described above, the pipe material 4 has three lock grooves 4a having the same shape and one lock groove 4b having another shape formed below the lock grooves 4a.
[0025]
As shown in FIG. 8A, the lock groove 4 a includes a flat bottom surface portion 14 formed by pressing the relief portion 6 b of the punch 6, and substantially perpendicular to the bottom surface portion 14 above the bottom surface portion 14. The flat side surface portion 16 is formed, the arc portion 18 connected to the side surface portion 16, and the inclined portion 20 formed by pressing the inclined portion 6 c of the punch 6 below the bottom surface portion 14.
[0026]
On the other hand, as shown in FIG. 8B, the lock groove 4 b includes a flat bottom surface portion 22 formed by pressing the relief portion 8 b of the punch 8, and a bottom surface portion 22 above and below the bottom surface portion 22. A flat side surface portion 24 formed substantially perpendicular to the side surface portion 24 and arc portions 26 connected to the side surface portion 24 are provided.
[0027]
Further, as shown in FIG. 9, concave portions 28 formed by pressing the two protrusions 6a of the punch 6 are formed on both sides of the lock groove 4a, and on both sides of the lock groove 4b, Similarly, a recess 30 is formed which is generated by pressing the two protrusions 8 a of the punch 8. The depths of the relief portions 6b and 8b of the punches 6 and 8 are such that the heights of the bottom surface portions 14 and 22 of the lock grooves 4a and 4b are higher than the heights of the protruding portions 32 and 34 generated outside the recesses 28 and 30. Is set to
[0028]
With the above configuration, as indicated by the phantom line in FIG. 9, the tip of the lock member 36 always comes into contact with the bottom surface portions 14 and 22 of one of the lock grooves 4a and 4b, and the headrest is securely held at a desired position. can do.
[0029]
In addition, since the punches 6 and 8 are provided with the relief portions 6b and 8b, when the pipe material 4 is formed, there is almost no surplus on the outer periphery of the pipe material 4, so when the headrest pole is raised and lowered, It is possible to slide smoothly without interference.
[0030]
As shown in FIG. 7, the headrest having the headrest pole having the above-described configuration is provided with lock members 36 provided inside the pole guide of the seat back and biased toward the headrest pole by a spring 37, as shown in FIG. It is held (locked) in a desired position by being fitted into one of the two.
[0031]
In the state where the lock member 36 is fitted in any one of the three lock grooves 4a, when it is desired to increase the height of the headrest, if an upward force is applied to the headrest, the bottom surface portion 14 of the lock groove 4a is applied. The abutting lock member 36 slides on the inclined portion 20 against the urging force of the spring 37. Therefore, when the headrest is lifted to a desired position and then released, the lock member 36 is fitted into any one of the other lock grooves 4a or 4b, and the headrest is held at that position.
[0032]
However, even if the headrest is lifted while the lock member 36 is fitted in the lowermost lock groove 4b, no inclined portion is formed below the lock groove 4b. Since it contacts the flat side surface portion 24 formed below 4b, the headrest is prevented from moving upward.
[0033]
That is, the reason why the inclined portion is not provided in the lowermost lock groove 4b of the headrest pole is to make the lock groove 4b act as a stopper for preventing the headrest from coming off.
[0034]
Conversely, even when a downward force is applied to the headrest in a state where the lock member 36 is fitted in any one of the four lock grooves 4a and 4b, the lock member 36 is formed above the lock grooves 4a and 4b. The flat side surface portion 16 or 24 is in contact with the headrest, and the headrest does not descend.
[0035]
In order to reduce the height of the headrest, when a lock release member (not shown) attached to the seat back is pressed, the lock member 36 moves against the urging force of the spring 37 and the lock is released. The Therefore, since the headrest is lowered by its own weight, when the hand is released from the unlocking member at a desired position, the lock member 36 is fitted into any one of the lock grooves 4a or 4b, and the headrest is held at that position.
[0036]
As a matter of course, when the headrest is lifted while the lock release member is pressed, the lock member 36 does not fit into the lowermost lock groove 4b, and the headrest can be separated from the seat back.
[0037]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
According to the first aspect of the present invention, the headrest pole includes a plurality of lock grooves formed in the pipe material at predetermined intervals, and each of the plurality of lock grooves has a flat bottom surface portion and a bottom surface. Since it has the recessed part formed in the both sides of a part, the surplus thickness does not protrude on the outer periphery of a pipe material, and a headrest pole can be slid smoothly with respect to a pole guide.
[0038]
In addition, since the concave portions are formed on both sides of the bottom surface portion, the lock member always comes into contact with the bottom surface portion when locked, and the headrest can be securely held at a desired position.
[0039]
According to the invention described in claim 2, since the flat side surface portion is formed above the bottom surface portion in some of the plurality of lock grooves, the inclined portion is formed below the bottom surface portion. It can be reliably held at a desired position by its own weight, and can be lifted smoothly by applying an upward force to the headrest.
[0040]
According to the invention described in claim 3, since the flat side surface portion is formed above and below one of the plurality of lock grooves, this groove can be used as a stopper for preventing the headrest from coming off.
[0041]
Furthermore, according to the invention described in claim 4, since the two protrusions are provided on both sides of the tip pressing part of the lock groove forming tool, and the relief part is provided between the two protrusions, the outer periphery of the pipe material is provided. It is possible to provide a headrest pole that slides smoothly with respect to the pole guide without excessive protrusion.
[0042]
Further, since the recesses can be formed on both sides of the lock groove by the two protrusions, the lock member is surely brought into contact with the bottom surface portion when locked, and the headrest can be securely held at a desired position.
[0043]
According to the invention described in claim 5, the tip pressing portion has a substantially semicircular cross-sectional shape, and the inclined portion is formed on one side of the protrusion and the relief portion. An inclined surface can be formed at the same time, and the headrest can be lifted smoothly by applying an upward force to the headrest.
[0044]
According to the invention described in claim 6, since the tip pressing portion is formed in a flat plate shape having two surfaces perpendicular to and parallel to the pressing surface, one of the plurality of locking grooves is simultaneously formed with the processing of the bottom surface of the locking groove. Flat side portions can be formed above and below the two, and this groove can act as a stopper for retaining the headrest.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a method for forming a lock groove of a headrest pole according to the present invention.
FIG. 2 is a perspective view of one of a plurality of lock groove forming tools shown in FIG.
3 shows the lock groove forming tool of FIG. 2, in which (a) is a front view thereof, (b) is a plan view thereof, and (c) is a partially enlarged side view thereof.
4 is another perspective view of the plurality of lock groove forming tools shown in FIG. 1. FIG.
5 shows the lock groove forming tool of FIG. 4, wherein (a) is a front view thereof, (b) is a plan view thereof, and (c) is a partially enlarged side view thereof.
FIG. 6 is a front view of a headrest pole according to the present invention.
7 is a partially enlarged perspective view of the headrest pole of FIG. 6. FIG.
8 shows a lock groove formed in the headrest pole of FIG. 6, wherein (a) is one longitudinal sectional view thereof, and (b) is another longitudinal sectional view thereof.
9 is a cross-sectional view taken along a plane along the lock groove of the headrest pole of FIG. 6. FIG.
FIG. 10 is a perspective view of a conventional vehicle seat.
11 is a perspective view of a headrest attached to the seat of FIG.
12 is a partial perspective view of a lock groove forming tool of a headrest pole attached to the headrest of FIG. 11. FIG.
13 is a partial perspective view of another lock groove forming tool of the headrest pole attached to the headrest of FIG. 11. FIG.
14 is a cross-sectional view when a lock groove is formed by the lock groove forming tool of FIG. 12 or FIG. 13, and particularly shows a case where the width of the lock groove forming tool is wide.
15 is a cross-sectional view when a lock groove is formed with the lock groove forming tool of FIG. 12 or FIG. 13, and particularly shows a case where the width of the lock groove forming tool is narrow.
[Explanation of symbols]
2 Anvil 4 Pipe material 4a, 4b Lock groove 6, 8 Punch 6a, 8a Protruding part 6b, 8b Relief part 6c Inclined part 10 Punch holder 12 Punch guide 12a, 12b Punch insertion hole 12c Arc-shaped concave part 14, 22 Bottom part 16, 24 Side portions 18 and 26 Arc portions 20 Inclined portions 28 and 30 Recess portions 32 and 34 Projection portions 36 Lock members 37 Springs

Claims (6)

A headrest pole attached to the headrest,
A headrest comprising a plurality of lock grooves formed in a pipe material at predetermined intervals, each of the plurality of lock grooves having a flat bottom surface portion and concave portions formed on both sides of the bottom surface portion. Pole. The headrest pole according to claim 1, wherein a flat side surface portion is formed above the bottom surface portion in some of the plurality of lock grooves, and an inclined portion is formed below the bottom surface portion. The headrest pole according to claim 1, wherein flat side portions are formed above and below one of the plurality of lock grooves. A lock groove forming tool for a headrest pole attached to a headrest,
A lock groove forming tool for a headrest pole, comprising: two protrusions provided on both sides of the tip pressing part; and a relief part provided between the two protrusions. The lock groove forming tool for a headrest pole according to claim 4, wherein the tip pressing portion has a substantially semicircular cross-sectional shape, and an inclined portion is formed on one side of the protruding portion and the relief portion. The lock groove forming tool for a headrest pole according to claim 4, wherein the tip pressing portion is formed in a flat plate shape.

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