JP2659201B2 - Position adjustment mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a position adjusting mechanism capable of adjusting a member to be adjusted to an arbitrary position in a stepless manner.

[Prior art and problems to be solved]

Conventionally, as this kind of position adjusting mechanism, one having a spring coupler is known. However, since the structure of this spring coupler is complicated, the position adjusting mechanism is inevitably complicated, and it is difficult to use various devices. Assembly becomes complicated. Accordingly, an object of the present invention is to provide a position adjusting mechanism having a simple structure and easy to assemble.

[Means for solving the problem]

In the present invention, this kind of position adjusting mechanism is provided with left and right inclined friction engagement surfaces inclined in directions opposite to each other with respect to the axis at an interval on the outer periphery, and fixedly supported by the support member. A first rotation that includes a shaft and an inclined friction engagement surface that engages or disengages with one of the two inclined friction engagement surfaces, is rotatably mounted on the outer periphery of the fixed shaft, and is fixed to an adjustable member. A second rotating member that includes a member and an inclined friction engagement surface that engages and disengages with one of the two inclined friction engagement surfaces, is rotatably mounted on the outer periphery of the fixed shaft, and rotates by an external operation. The two rotating members are in contact with or separated from each other by relative rotation, and at the time of contact, the respective inclined friction engagement surfaces opposed to each other are frictionally engaged by the axial force.

Preferred embodiments of the position adjusting mechanism are as described in (1) and (2) below. That is, (1) one inclined friction engagement surface of the fixed shaft is formed by a right-hand thread portion, the other inclined friction engagement surface is constituted by a left-hand thread portion, and each of the rotating members is It is a nut member which is screwably engaged with each of the screw portions.

(2) Each of the inclined friction engagement surfaces of the fixed shaft is constituted by an inclined cam surface, and the rotating member is provided with an inclined cam surface which engages with and disengages from each of the inclined cam surfaces. It is a cam member to be fitted.

[Functions and effects of the invention]

In such a configuration, when the two rotating members are in contact with each other, the inclined frictional engagement surfaces facing each other frictionally engage in one rotational direction due to the acting force in the axial direction, and the two rotating members are in contact with each other. The rotation in the same direction is regulated, and the movement of the adjustable member fixed to the first rotating member in one direction is regulated. In this state, when the second rotating member is rotated in the other rotating direction by an external operation to be separated from the first rotating member,
The rotation of the rotating member in one direction is free, and when the member is rotated in the same direction, the member moves in the axial direction by a distance separated by the action of each inclined frictional engagement surface to be engaged, and the second member rotates. , And rotation in one direction is regulated thereafter.
During this time, the adjusted member moves in one direction by the amount of rotation or movement of the first rotating member, and thereafter movement in one direction is restricted. Therefore, the adjustable member can be moved to an arbitrary position and locked by operation of the second rotating member, so that the position can be adjusted steplessly. When the member to be adjusted is moved in the other direction, the first rotating member rotates in the other direction and the second rotating member rotates in the other direction.
In order to move away from the rotating member, the adjustable member can be moved to an arbitrary position in the other direction, and then the second rotating member is rotated in one direction to abut the first rotating member. The adjustable member is locked at that position.

Thus, the position adjusting mechanism according to the present invention has a specific fixed shaft and both rotating members as main components, and has a simple structure and easy assembly.

〔Example〕

The present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an embodiment of a first position adjusting mechanism according to the present invention, and FIGS. 3 to 5 show a second position adjusting mechanism. FIG. In the first position adjusting mechanism, one of the inclined friction engagement surfaces of the fixed shaft is formed of a right-hand thread portion, and the other inclined friction engagement surface is constituted of a left-hand thread portion. This is an embodiment in which the member is a nut member that is screwably engaged with each of the screw portions, and the adjustment mechanism includes a fixed shaft 1 and a pair of nut members 2 and 3 as main components. The fixed shaft 1 is fixedly supported by an appropriate support member 4 and has a right-hand thread portion 1a and a left-hand thread portion 1b at an intermediate outer peripheral portion thereof. These two threaded portions 1a and 1b are located in series with each other with a predetermined distance therebetween, a right-handed threaded nut member 2 is screwably engaged with the right-handed threaded portion 1a, and a left-handed threaded portion 1b. The nut member 3 of the left screw is screwed forward and backward. One of the two nut members 2 and 3 corresponds to the first rotating member of the present invention, and the other corresponds to the second rotating member of the present invention. Alternatively, both rotate in the direction of arrow A and move forward and abut against each other, and further rotation in the same direction is restricted. In this state, when one of the two nut members 2, 3 rotates in the direction of arrow B and separates from the two nut members 2, 3, the other nut member 2, 3 becomes rotatable in the direction of arrow A. , And when it advances by a predetermined amount and abuts one of the nut members 2 and 3, further rotation in the same direction is restricted.

Further, the second position adjusting mechanism has an inclined cam surface in which each inclined friction engagement surface of the fixed shaft is constituted by an inclined cam surface, and the rotating member is engaged with and disengaged from each of the inclined cam surfaces. In an embodiment, the adjusting member is a cam member fitted to the outer periphery of the fixed shaft, and the adjusting mechanism includes a fixed shaft 1A, a pair of cylindrical rotary cams 2A and 3A, and a pair of cylindrical fixed cams 4A and 5A. It is a main component. The fixed shaft 1A is fixedly supported by an appropriate support member, and first and second rotating cams 2A and 3A are rotatably mounted on the outer periphery of the intermediate member, and the first and second rotating cams 2A and 3A are rotatably mounted on the outer periphery of the left and right ends. First and second fixed cams 4A and 5A are non-rotatably mounted. The first rotating cam 2A and the fixed cam 4A have a plurality of inclined cam surfaces 2a, 4a which are engaged and disengaged from each other.
The rotating cam 3A and the fixed cam 5A have a plurality of inclined cam surfaces 3a, 5a which are engaged and disengaged from each other. One of the two rotating cams 2A and 3A corresponds to the first rotating member of the present invention, and the other corresponds to the second rotating member of the present invention. Thus, the rotating cams 2A and 3A abut each other, and the respective inclined cam surfaces 2a, 4a and 3a and 5a facing each other due to the axial force are frictionally engaged, and further rotation in the same direction is restricted. You. In this state, when one of the two rotating cams 2A and 3A rotates in the direction of arrow C and the two rotating cams 2A and 3A are separated from each other,
A and 3A become rotatable in the direction of arrow D, move in the axial direction while rotating in the same direction, and come into contact with one of the rotary cams 2A and 3A. This restricts the rotation of the rotary cams 2A and 3A in the direction of arrow D.

Next, an example in which the first position adjusting mechanism is configured as a position adjusting mechanism of an armrest in a vehicle seat will be described with reference to FIGS. 6 and 7. FIG. The armrest 10a is formed by covering an armrest frame 11 with a cushion pad 12, and includes a position adjusting mechanism 20 according to an embodiment of the present invention.
Through the seat back frame 13 constituting the seat back 10b.

The position adjusting mechanism 20 includes a fixed shaft 21 and a pair of nut members 2.
2 and 23, and the torsion spring 24
And an operation member 25. The fixed shaft 21 is formed with a right-hand thread portion 21a and a left-hand thread portion 21b on its outer periphery in series at a predetermined interval, and is fixed to the seat back frame 13 at an inner end thereof and protrudes outward. ing. The first nut member 22 has an outward flange portion 2 at one end of a right screw nut portion 22a.
2b, which is integrally fixed to the inner side surface 11a of the armrest frame 11 via an outward flange portion 22b via a bolt 26a. The first nut member 22 is threadably engaged with the right-hand thread portion 21a of the fixed shaft 21 so that the armrest 10a is fixed to the fixed shaft 21.
I support it. The second nut member 23 is a nut part for the left screw.
An annular outward flange portion 23b is integrally provided at one end of 23a, and an outer periphery of a nut portion 23a is formed on a pinion 23c. The second nut member 23 is threadably engaged with the left threaded portion 21b of the fixed shaft 21.

In this state, the fixed shaft 21 is
The torsion spring 24 fits over the small-diameter portion 21c on the distal end side through the through-hole 11b of the eleventh and reaches the vicinity of the other through-hole 11c. One end 24a of the torsion spring 24 is locked to a plate 26b screwed to the tip of the fixed shaft 21, and the other end 24b is locked to a nut portion 23a of the second nut member 23. The operation member 25 includes a guide portion 25a having a predetermined length, an operation knob 25b provided at a tip thereof, and a rack 25c provided at a rear end thereof, and is slidably inserted into the guide groove 11d of the armrest frame 11. . When the operation knob 25b of the operation member 25 is exposed at the tip of the armrest 10a, and the rack 25c is engaged with the pinion 23c of the second nut member 23, the operation knob 25b is pushed and operated in the direction of arrow E. The second nut member 23 rotates in the direction of arrow B. The second nut member 23 is a torsion spring 24
Is constantly urged in the direction of arrow A.

In the position adjusting mechanism 20 configured as described above, the two nut members 22 and 23 are in contact with each other, and the first nut member
The rotation of the armrest 22 in the direction of arrow A is restricted, and the armrest 10a is locked to the seat back frame 13 at the storage position, for example, as shown by a two-dot chain line in FIG. When the operation knob 25b is pushed in the direction of arrow E in this state, the second nut member 23 is rotated in the direction of arrow B, and the first nut member 22 is rotated.
Separate from. For this reason, the first nut member 22 is free in the direction of arrow A and corresponds to the distance of arrow A by the distance corresponding to the distance.
The armrest 10a tilts in the direction of arrow F in accordance with the amount of rotation. At this point, since the first nut member 22 is in contact with the second nut member 23 and further rotation in the direction of arrow A is restricted, the armrest 10
a is also locked at the tilted position in the direction of arrow F. When the operation knob 25b is further pushed in the direction of arrow E in this state, the second nut member 23 rotates in the direction of arrow B as described above, and the armrest 10a further tilts in the same manner as described above and locks at the tilted position. Is done. In this embodiment, the armrest 10a is tilted and locked at the maximum to the position shown by the solid line in FIG. 6, and locked in an arbitrary tilting state within the tilting range of the solid line and the two-dot chain line.

Next, the armrest 10 in the state shown by the solid line in FIG.
In order to tilt a to the storage side indicated by the two-dot chain line, the armrest 10a may be raised in the direction of arrow G. In this case, the first nut member 22 is moved to the seventh position in accordance with the rotation of the armrest 10a.
The second nut member 23 rotates in the direction of arrow A by the urging force of the torsion spring 24 and follows the first nut member 22 by rotating in the direction of arrow B in the figure and separating from the second nut member 23. Therefore, if the rotation of the armrest 10a in the direction of the arrow G is interrupted, the second nut member 23 becomes the first nut member.
The rotation of the nut member 22 in the direction of arrow A is restricted by contacting the nut 22. When the armrest 10a is rotated stepwise in the direction of arrow G, the above state is repeated and finally the armrest 10a is rotated.
a reaches the storage position indicated by the two-dot chain line.

As described above, in the present embodiment, the armrest 10a can be tilted to an arbitrary position and locked in a stepless manner. However, the number of constituent members is small, the structure is simple, and the assembling is easy.

The position adjusting mechanism according to the present invention is not limited to the armrest of the vehicle seat, and may be implemented as a position adjusting mechanism for various parts and members.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a first position adjusting mechanism according to the present invention, FIG. 2 is a sectional view thereof, and FIG.
FIG. 4 is an exploded perspective view showing the embodiment of the position adjusting mechanism, FIG. 5 is a schematic exploded view for explaining the operation of the mechanism, and FIG. 6 is a position adjusting apparatus according to an embodiment of the present invention. FIG. 7 is a perspective view of a seat to which an armrest is attached by a mechanism, and FIG. 7 is an exploded perspective view of the mechanism. Description of reference numerals 1,1A …… Fixed shaft, 2,3 …… Nut member, 2A, 3A …… Rotating cam, 4A, 5A …… Fixed cam, 10a …… Armrest, 11
…… Armrest frame, 20 …… Position adjustment mechanism, 21…
... fixed shaft, 22, 23 ... nut member, 24 ... torsion spring, 25 ... operating member.

Claims (3)

(57) [Claims] A fixed shaft fixedly supported by a support member and having left and right inclined friction engagement surfaces inclined in directions opposite to each other with respect to an axis on an outer periphery thereof; A first rotating member having an inclined friction engagement surface engaged and disengaged on one of the mating surfaces and rotatably mounted on the outer periphery of the fixed shaft and fixed to an adjustable member; A second rotating member is provided rotatably mounted on the outer periphery of the fixed shaft and having an inclined friction engagement surface engaged and disengaged with one of the mating surfaces, and is rotated by an external operation. A position adjusting mechanism which is brought into contact with and separated from each other by rotation, and at the time of contact, the inclined friction engagement surfaces facing each other are frictionally engaged by an axial force. 2. The fixed shaft has one inclined frictional engagement surface formed by a right-hand thread portion, the other inclined frictional engagement surface constituted by a left-hand thread portion, and each of the rotating members is The position adjusting mechanism according to claim 1, wherein the nut is a nut member that is screwably engaged with each of the screw portions. 3. The fixed shaft is provided with each inclined friction engagement surface formed by an inclined cam surface, and the rotating member is provided with an inclined cam surface which engages with and disengages from each of the inclined cam surfaces. 2. The position adjusting mechanism according to claim 1, wherein the position adjusting mechanism is a cam member fitted to an outer periphery.