JP2010051385A - Armrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a support mechanism of an armrest body of an armrest which is provided on a seat of a vehicle or the like and which has the armrest body in which the angles of using posture of the armrest body can be adjusted. <P>SOLUTION: The support mechanism 30 of the armrest 10 includes: a stopper 62 provided on an end of a support arm 50 regulated so as to move approximately linearly by link structure; and a holding part 42 provided along a displacement range of the stopper 62. In the support mechanism 30, the support arm 50 displaces in a direction toward which an armrest body 12 rotates upward while the stopper 62 abuts against the holding part 42, and the stopper 62 and the holding part 42 are engaged in a displacement direction of the holding arm 50 which the armrest body 12 rotates downward, so that the posture of the armrest body 12 is maintained across an abutting range. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an armrest that is provided on a seat of a vehicle or the like and is capable of adjusting the angle of use of an armrest body.

  An armrest for hanging an arm is provided on a seat of a vehicle such as a passenger car so that an occupant can maintain a comfortable posture. For example, the armrest provided on the front seat is installed rotatably on the side of the backrest part of the seat so that it can be used horizontally when in use and retracted to the retracted position upright on the side of the backrest when not in use Has been. By the way, occupants of various physiques sit on the seat, and the tilt angle of the backrest and the occupant's sitting position are various, so the position of the occupant's elbow is also different, and the angle when using the armrest matches the occupant There is a desire to adjust.

  For example, the armrest includes a disk that is fixed to the armrest and has ratchet teeth on the peripheral surface, and a mounting plate that is fixed to a support shaft that is fixed to the seat, and ratchet claws provided on the mounting plate are attached to the ratchet teeth of the disk. Some include an angle adjustment mechanism of a so-called ratchet structure configured to be able to hold the armrest at a predetermined angle by being engaged (see Patent Document 1).

Another armrest is a drum fixed to the seat, a case fixed to the armrest and rotatable relative to the drum, one end fixed to the case and wound around the drum, and the other end free. There has also been proposed a so-called friction structure angle adjustment mechanism having a coil spring (see Patent Document 2). In the angle adjustment mechanism disclosed in Patent Document 2, the coil spring is tightened when the armrest is rotated downward, and the armrest cannot be rotated by the torque of the coil spring and can be held at a predetermined angle. The coil spring is loosened when rotated upward. The armrest is allowed to rotate freely.
Japanese Patent No. 2582264 Japanese Patent No. 3891584

  The angle adjustment mechanism of the ratchet structure disclosed in Patent Document 1 is a structure in which ratchet teeth that engage with ratchet claws are provided on the peripheral surface of a disk-shaped disk, and when the angle at which the armrest can be adjusted is finely set, It is necessary to increase the number of ratchet teeth provided on the peripheral surface. However, as the ratchet teeth increase, the diameter of the disk increases, and it is pointed out that the angle adjustment mechanism is enlarged. In addition, the ratchet structure angle adjustment mechanism is configured to support the load applied to the armrest via the ratchet pawl with the ratchet teeth of the disc, so that the ratchet pawl, the mounting plate on which the ratchet pawl is provided, and the disc must have high rigidity. The That is, it is necessary to configure the members constituting these angle adjusting mechanisms with a highly rigid metal material, and the weight of the armrest increases.

  Since the angle adjusting mechanism of the friction structure disclosed in Patent Document 2 is configured to hold the armrest at a predetermined angle by loosely tightening the coil spring, a highly elastic coil spring is used, and in order to cope with the elasticity of the coil spring, a drum or case Need high rigidity. That is, the members constituting these angle adjusting mechanisms are made of a metal material, and there is a problem that the weight of the armrest increases.

  That is, the present invention has been proposed in order to suitably solve these problems inherent in the armrest according to the prior art, and has an angle adjustment function and a small and lightweight support mechanism. The aim is to provide an armrest.

In order to overcome the above-mentioned problems and achieve the intended purpose, an armrest according to claim 1 of the present application is
An armrest provided with a support mechanism for rotatably supporting the armrest body with respect to the seat,
The support mechanism is
A fixing portion that is provided so as not to rotate with respect to the seat, and supports the armrest body rotatably;
A connecting arm rotatably connected to the fixed part;
A support arm rotatably connected to the coupling arm and rotatably connected to the armrest body;
A holding portion that is non-rotatable with respect to the seat and extends linearly in a direction intersecting the rotation center axis of the armrest body;
A stopper provided on one end of the support arm configured to be displaced along the holding portion by a link structure defined by the arrangement of the armrest body and the connecting portion of each arm, and a stopper portion that contacts the holding portion. Prepared,
The support mechanism allows displacement of the support arm in a direction in which the armrest body rotates upward while the stopper portion is in contact with the holding portion, and in a direction in which the armrest body rotates downward. In the displacement direction of the support arm, the armrest body can be held in a posture over a contact range where the stopper portion and the holding portion come into contact with each other.
According to the first aspect of the present invention, a link structure in which a plurality of arms are combined is employed as the support mechanism, and the displacement amount per rotation angle of the armrest body at one end of the support arm that performs an approximate linear motion with respect to the rotation of the armrest body. Can be reduced. That is, the support mechanism can set the space for the displacement of the stopper portion and the size of the holding portion engaged with the stopper portion to be small, so that the whole can be reduced in size and weight. In addition, since the support mechanism is configured to support the load applied to the armrest body by being dispersed by a plurality of arms, the rigidity required for each arm is reduced, and each arm is formed of synthetic resin, or has a thickness or shape. Thus, it is possible to reduce the size and weight.

In the invention according to claim 2, the stopper portion can be in contact with the holding portion in the contact range, and can be retracted away from the holding portion in the contact range and cannot be in contact with the holding portion. The gist is to be configured to be displaceable between postures.
According to the invention of claim 2, by displacing the stopper portion to the retracted posture, the stopper portion and the holding portion do not engage with each other, and downward rotation of the armrest body is allowed. By making the stopper portion swingable, the armrest body can be smoothly rotated upward.

In the invention which concerns on Claim 3, the said holding part is provided with a plurality of holding tooth parts arranged in parallel in the displacement direction of the end of the above-mentioned support arm in the above-mentioned contact range,
The gist of the invention is that the stopper portion includes a plurality of support tooth portions that are provided to face the holding portion and mesh with the plurality of holding tooth portions.
According to the third aspect of the present invention, since the displacement amount of one end of the support arm per rotation angle of the armrest is small in the contact range in which the posture of the armrest body can be held, the support tooth portion of the stopper portion and the holding portion are held. The meshing with the teeth can be changed at a fine pitch, and the posture of the armrest body can be changed at fine intervals. And the load which can be supported by a support mechanism can be enlarged by setting it as the structure which a some support tooth part and a some holding tooth part mesh.

In the invention according to claim 4, the support mechanism is configured such that a load applied via the support tooth portion in a direction in which the armrest body is rotated downward is perpendicular to the tooth surface of the holding tooth portion or the tooth surface). It is summarized that the link structure is configured so as to be input with an obtuse angle guided to the groove side of the holding tooth portion.
According to the fourth aspect of the invention, the load input from the support tooth portion to the holding tooth portion is guided to the groove side of the holding tooth portion at a right angle or along the tooth surface of the holding tooth portion. Since the link structure of the support mechanism is configured so as to be input in an obtuse angle relationship, the support tooth portion and the holding tooth portion can be reliably engaged with each other, and the load that can be supported by the support mechanism is increased.

The gist of the invention according to claim 5 is that the support mechanism includes an elastic member that urges the stopper portion toward the holding posture in the contact range.
According to the invention which concerns on Claim 5, a stopper part and a holding | maintenance part can be reliably engaged by energizing a stopper part toward a holding | maintenance attitude | position.

In the invention according to claim 6, the support mechanism is provided at a portion exceeding the upper limit of the contact range on the displacement trajectory of the stopper portion, and the stopper portion in the holding posture during the upward rotation of the armrest body. The gist of the invention is that it includes a switching unit that displaces the lever to the retracted posture.
According to the invention of claim 6, by rotating the armrest body and displacing the stopper portion outside the contact range, the stopper portion can be switched from the holding posture to the retracted posture by the switching portion, and the stopper portion is held. The armrest body can be returned to the lower rotation limit without being engaged with the portion.

In the invention according to claim 7, the stopper portion is provided so as to be rotatable eccentrically with respect to the support arm so that a peripheral surface thereof contacts the holding portion in the contact range.
In the contact range, the stopper portion is located at a position where the distance from the rotation fulcrum to the peripheral surface increases in the displacement direction of one end of the support arm accompanying the downward rotation of the armrest body. And a portion where the distance from the rotation fulcrum to the peripheral surface is shortened in the displacement direction of one end of the support arm accompanying the upward rotation of the armrest body, and the displacement of the support arm is allowed. This is the gist.
According to the invention of claim 7, the angle of the armrest body can be adjusted steplessly.

In the invention according to claim 8, the connecting arm is sandwiched and connected between the first fixed piece and the second fixed piece constituting the fixed portion, and the first support piece constituting the support arm. The gist of the present invention is to be sandwiched between and connected to the second support piece.
According to the invention which concerns on Claim 8, it can suppress that force is biased and transmitted to a specific part between a fixing | fixed part, a connection arm, and a support arm, and can concentrate stress on one side in the connection part of these arms. Can be avoided.

In the invention according to claim 9, the fixing portion includes a plate-like portion of the armrest body to which the fixing portion and the support arm are connected, and a cover that covers the fixing portion and the arm and is assembled to the armrest body. The gist is to be sandwiched between.
According to the invention which concerns on Claim 9, the assembly | attachment structure of each arm can be simplified.

  According to the armrest according to the present invention, the support mechanism having the angle adjusting function can be made small and lightweight.

  Next, a preferred embodiment of the armrest according to the present invention will be described below with reference to the accompanying drawings. In the embodiments, front and rear refer to the front and rear direction of the vehicle as a reference. For example, in FIG. 1, the left side in the figure is the front side of the vehicle, and the right side in the figure is the rear side of the vehicle. Further, in the embodiments, left and right refer to the case where the vehicle is viewed from the front side, and in FIG. 2, the upper side in the figure corresponds to the left side and the lower side in the figure corresponds to the right side. In the embodiment, a case where the armrest is disposed on the right side surface of the backrest portion 100a in the seat 100 of the driver's seat will be described (see FIG. 12).

  As shown in FIGS. 1 to 4, the armrest 10 according to the first embodiment includes an armrest body 12 having an armrest portion and a support mechanism 30 that supports the armrest body 12 so as to be rotatable up and down with respect to the seat 100. I have. The armrest 10 has a lower rotation limit (refer to FIG. 1 or FIG. 15) and an armrest body 12 on the backrest of the seat 100. The armrest body 12 can be displaced by the support mechanism 30 between the upper rotation limit (see the solid line in FIG. 4 or FIG. 15) as a retracted posture that stands up so as to overlap the portion 100 a. Further, the support mechanism 30 has a predetermined angle adjustment range (for example, −10 ° serving as a rotation lower limit with respect to a horizontal plane) that is a use posture of the armrest body 12 set between the rotation lower limit and the rotation upper limit of the armrest body 12. (For example, in FIG. 3), the armrest body 12 also has a function as an angle adjustment mechanism that can hold the armrest body 12 in a predetermined inclination or a horizontal posture. The angle adjustment range of the armrest body 12 is defined by a contact range in which a later-described stopper portion 62 and the holding portion 42 of the support mechanism 30 are in contact. The support mechanism 30 is attached to the attachment portion 14 fixed to the right side surface of the backrest portion 100a of the seat 100.

  The mounting portion 14 of the first embodiment is fixed to the backrest portion 100a, and the mounting bracket 16 that holds a fixed arm 32 as a fixing portion, which will be described later, of the support mechanism 30 in a non-rotatable manner. The mounting bolt 18 is screwed into a screw hole provided in a frame (not shown) of the backrest portion 100a through the hole 16a (see FIG. 2 or FIG. 10). The mounting bracket 16 is disposed outside the armrest body 12 (between the backrest portion 100a and the armrest body 12) (see FIG. 2). In addition, the mounting bracket 16 has a mounting recess 17 having a polygonal shape (regular hexagonal shape in the first embodiment) formed on the surface facing the armrest body 12, and a mounting hole 16 a is provided through the mounting recess 17. (See FIG. 10). In addition, in the armrest 10, the attaching part 14 is arrange | positioned so that it may be located in the rear part side of the armrest main body 12 in a use attitude | position.

  The armrest body 12 is a long member that matches the arm, and the length of the armrest body 12 extends in the front-rear direction in the use posture (see the dashed line in FIG. 15), and rotates around the rear side where the mounting portion 14 is located. In the retracted posture, the longitudinal length extends in the vertical direction (see the solid line in FIG. 15). As shown in FIG. 10, the armrest body 12 is mainly configured by a frame 20 as a structure that receives a load applied to the armrest body 12. The armrest body 12 includes a cushion material such as urethane or rubber provided outside the frame 20 and a skin material such as leather or fabric that covers the cushion material and forms the design surface of the armrest body 12. (Both not shown).

  As shown in FIG. 10, the frame 20 is a synthetic resin molded product in which a flange 24 is formed on the outer peripheral edge of the plate-like portion 22, and the support mechanism 30 is provided on the rotation fulcrum side of the armrest body 12 in the frame 20. An accommodation space 20a to be accommodated is provided. The accommodation space 20 a is configured by a plate-like portion 22 on the backrest portion 100 a side and is surrounded by a flange 24 formed to extend rightward from the plate-like portion 22, and the opposite side to the backrest portion 100 a is the right end of the flange 24. It is covered with a cover 26 which is assembled to (see FIG. 2). The frame 20 is provided with a shaft hole 22a that passes through the plate-like portion 22 and communicates with the accommodation space 20a, and a shaft recess 22b that is recessed in the plate-like portion 22 and opens into the accommodation space 20a. In the 12 use postures, the shaft recess 22b is arranged to be positioned on the front side of the shaft hole 22a. Note that the cover 26 includes a through hole 26a that is provided so as to communicate with the accommodation space 20a at a position aligned with the shaft hole 22a on the left and right. Then, the armrest 10 has the mounting bolt 18 on the backrest portion 100a from the armrest body 12 side via the through hole 26a, the support mechanism 30 provided in the accommodation space 20a, the shaft hole 22a, and the mounting hole 16a without removing the cover 26. Can be inserted and removed.

  Next, the support mechanism 30 will be specifically described. Unless otherwise specified, the positional relationship and direction of the members constituting the support mechanism 30 are determined with reference to the use posture of the lower limit of the armrest body 12 (see FIG. 1). Say. The support mechanism 30 is fixed to the mounting portion 14 and is fixedly connected to the frame 20 of the armrest body 12 so as to be rotatable. The fixed arm 32 rotates at a portion other than the center of rotation of the frame 20. A link structure that can rotate the frame 20 (armrest main body 12) up and down is constituted by the connecting arm 46 that can be connected and the support arm 50 that is rotatably connected to the frame 20 and the connecting arm 46 ( (See FIG. 11). Further, in the support mechanism 30, the lower ends (one end) of the support arm 50 positioned below the connection portion with the frame 20 are displaced along the holding portions 42 provided on the fixed arm 32 so that the arms 32 and 46 are displaced. , 50 connecting portions are arranged. The holding portion 42 is provided so as to extend linearly in a direction intersecting with the rotation center axis of the armrest body 12. That is, the support mechanism 30 has a link structure such that the lower end of the support arm 50 moves approximately linearly in the vertical direction in accordance with the displacement of the frame 20 that rotates up and down with the connection portion with the fixed arm 32 as a fulcrum. (See FIG. 3). Furthermore, the link structure is configured such that when the lower end of the support arm 50 moves in an approximate straight line in the vertical direction, the lower end of the support arm 50 moves in an approximate uniform linear motion. For example, when the lower end of the support arm 50 is displaced at a pitch of 1 mm, the armrest body 12 is rotationally displaced at a pitch of 2 °.

  In the support mechanism 30, the fixed arm 32, the connecting arm 46, and the support arm 50 are accommodated in the accommodating space 20 a of the frame 20, and are surrounded by the flange 24 between the plate-like portion 22 of the frame 20 and the cover 26. (See FIG. 1 or FIG. 2). In the support mechanism 30, the fixed arm 32, the connecting arm 46, and the supporting arm 50 are all molded products of synthetic resin, and the fixing arm 32, the connecting arm 46, the supporting arm 50, and the frame 20 are attachment means such as screws. Are connected to each other by a fitting structure formed by unevenness of each other and sandwiching the plate-like portion 22 of the frame 20 and the cover 26.

  The support mechanism 30 is provided with a stopper portion 62 facing the holding portion 42 at the lower end of the support arm 50 that moves approximately linearly in the vertical direction along the holding portion 42 provided on the fixed arm 32 by a link structure. A portion 60 is provided (see FIG. 1, FIG. 3, FIG. 5 or FIG. 11). Here, the side on which the support portion 60 is provided in the support arm 50 is an end portion opposite to the displacement direction of the support arm 50 when the armrest body 12 is rotated upward from the use posture to the retracted posture. That is, in the link structure of the first embodiment, the support arm 50 is displaced upward when the frame 20 is rotated upward, so that the support portion 60 is provided at the lower end of the support arm 50. The support mechanism 30 has a contact range where the support unit 60 and the holding unit 42 contact each other over a range in which the support unit 60 moves approximately linearly as the armrest body 12 rotates. Then, the support mechanism 30 restricts the downward displacement of the lower end of the support arm 50 in the direction in which the armrest body 12 rotates downwardly in the contact range to be below the contact between the stopper portion 62 and the holding portion 42. (See FIG. 5A). In other words, since the support mechanism 30 holds the armrest body 12 in the contact range, the angle adjustment range of the armrest body 12 is defined by the contact range.

  On the other hand, the support mechanism 30 changes the upper displacement of the lower end of the support arm 50 in the direction in which the armrest body 12 rotates upward in the contact range regardless of the contact between the stopper portion 62 and the holding portion 42. It is allowed (see FIG. 5B). That is, the support mechanism 30 allows the armrest body 12 to freely rotate upward in the contact range, while restricting the downward rotation of the armrest body 12 to hold the armrest body 12 at a predetermined angle. Configured to obtain. Here, the support mechanism 30 allows the armrest body 12 to freely rotate outside the contact range (outside the angle adjustment range of the armrest body 12) (see FIG. 4). Further, the support mechanism 30 includes a switching mechanism that changes the posture of the stopper portion 62, and after rotating the armrest body 12 outside the angle adjustment range, the stopper portion 62 and the holding portion 42 are not brought into contact with each other from outside the angle adjustment range. It is possible to return to the lower limit of rotation (see FIG. 8 or FIG. 9).

  In the support mechanism 30, the support arm 50 is supported by the connecting arm 46 connected to the fixed arm 32 and the frame 20, and is arranged in parallel so as to be positioned on the front side of the fixed arm 32 in the contact range. The support arm 50 is configured to displace between the front and the upper side of the fixed arm 32 as the armrest body 12 rotates (see FIG. 3 or FIG. 4). In the support mechanism 30, the frame 20 and the connection arm 46 are connected to the fixed arm 32 in an up-and-down relationship, and the frame 20 and the connection arm 46 are connected to the support arm 50 in an up-and-down relationship. That is, the connecting arm 46 is arranged in parallel in a vertical relationship with respect to a line connecting the shaft hole 22a and the shaft recess 22b of the frame 20. As shown in FIG. 1, in the support mechanism 30 according to the first embodiment, a connection portion between the fixed arm 32 and the coupling arm 46 is provided above the connection portion between the fixed arm 32 and the frame 20. A connecting portion between the support arm 50 and the connecting arm 46 is provided above the connecting portion with the 20.

In the support mechanism 30, the first axis A that is the rotation axis center at the connection portion between the fixed arm 32 and the frame 20, and the second axis B that is the rotation axis center at the connection portion between the fixed arm 32 and the connection arm 46. The third axis C, which is the center of the rotation axis at the connection between the support arm 50 and the frame 20, the fourth axis D, which is the center of the rotation axis at the connection between the support arm 50 and the connecting arm 46, and the support arm 50. The link structure is configured such that the displacement point Q located at the lower end has the following relationship (see FIG. 1 or FIG. 6). For example, in the link structure, a straight line AC connecting the first axis point A and the third axis point C and a straight line BD connecting the second axis point B and the fourth axis point D are parallel (AC / / BD), the ratio of the axial distance _LAC between the first axial point A and the third axial point C to the axial distance _LBD between the second axial point B and the fourth axial point D is the fourth axial point. It is set to be equal to the ratio of the axial distance L _DQ between D and the displacement point Q to the axial distance L _CQ between the third axial point C and the displacement point Q (L _AC / L _BD = L _DQ / L _CQ ).

As another condition, the link structure has an axial distance L _AB between the first axial point A and the second axial point B, and an axial distance L _BD between the second axial point B and the fourth axial point D 2. The distance L _CD between the third axis point C and the fourth axis point D and the axis point between the first axis point A and the third axis point C under the setting of double (L _AB = 2L _BD ) and the distance L _AC, and sets equal to the inter-axis point distance L _CQ of the third axis point C and displacement point Q, between the axis points of the second axis point B and the fourth axis point D distance L _BD, second The condition may be set to 2.5 times the distance L _BD between the axis points B and the fourth axis point D (L _CD = L _AC = L _CQ = 2.5L _BD ). As described above, when the support mechanism 30 in which the link structure is set under any of the above conditions rotates the frame 20 up and down around the connection portion with the fixed arm 32, the movement path of the displacement point Q at the lower end of the support arm 50 Are drawn to draw an approximate line. In addition, the support mechanism 30 is displaced so that the lower end of the support arm 50 is separated from the holding portion 42 as the armrest body 12 is rotated toward the retracted position outside the contact range, and the armrest body 12 is rotated toward the use position. Accordingly, the lower end of the support arm 50 is displaced so as to approach the holding portion 42.

  As shown in FIG. 10, the fixed arm 32 includes a first fixed piece 33 constituting a main body portion of the fixed arm 32, and an upper right surface of the first fixed piece 33 between the first fixed piece 33. And a second fixed piece 38 attached with the rear end portion of the connecting arm 46 interposed therebetween. The first fixing piece 33 is provided with a fixing hole 33a through which the mounting bolt 18 is inserted in the left and right direction and provided in the center portion, and a circular first shaft portion 34 that is aligned with the shaft hole 22a of the frame 20 is provided on the left surface. Projecting on the backrest 100a side surface. The first fixed piece 33 includes a fixed convex portion 35 that protrudes from the left surface of the first shaft portion 34 and is formed in a polygonal shape in accordance with the mounting concave portion 17 of the mounting bracket 16. Further, the first fixed piece 33 is formed with a first boss hole 36 opened on the right side above the rotation axis center (first axis point A) of the first shaft portion 34. When the first shaft portion 34 is inserted into the shaft hole 22a, the first fixing piece 33 fits the fixing protrusion 35 protruding toward the backrest portion 100a into the mounting recess 17, and the fixing hole 33a and the mounting hole 16a. Is fixed to the backrest portion 100a in a non-rotatable manner by mounting bolts 18 inserted through the screw and screwed into the backrest portion 100a. The first fixed piece 33 pivotally supports the frame 20 with the first shaft portion 34 with the plate-like portion 22 of the frame 20 sandwiched between the mounting brackets 16. The fixing hole 33 a is formed so as to penetrate the first shaft portion 34 and the fixed convex portion 35, and is disposed below the rotation axis center (first axis point A) of the connection portion with the frame 20.

  The second fixed piece 38 is formed in a shape aligned with the upper portion of the first fixed piece 33, and a second boss hole 39 is provided in the upper portion corresponding to the first boss hole 36. The second fixing piece 38 is formed with a fixing notch 38a in the lower portion corresponding to the fixing hole 33a of the first fixing piece 33, and is fixed to the second fixing piece 38 by the head of the mounting bolt 18 inserted into the fixing notch 38a and the fixing hole 38a. The piece 38 is held by the first fixed piece 33. The fixed arm 32 has a first left surface of the first fixed piece 33 in which the first shaft portion 34 is fitted in the shaft hole 22 a of the frame 20 abuts the plate-like portion 22 and is attached to the first fixed piece 33. 2 The right surface of the fixed piece 38 is configured to come into contact with the inner surface of the cover 26 attached to the flange 24 of the frame 20 (see FIG. 2). That is, the fixed arm 32 is sandwiched between the plate-like portion 22 and the cover 26 to maintain the assembled state of the first fixed piece 33 and the second fixed piece 38, and the mounting bolt 18 is inserted through the through hole 26 a of the cover 26. Even if it is removed, the first fixed piece 33 and the second fixed piece 38 are not separated. The fixed arm 32 has a receiving portion 32a extending in the rear side of the boss holes 36 and 39 in common with the first fixed piece 33 and the second fixed piece 38, and the receiving portion 32a is the armrest body. The movement of the support arm 50 is restricted at an upper limit of 12 rotations.

  The fixed arm 32 includes a holding portion 42 that forms an angle adjusting mechanism in relation to the stopper portion 62 on the lower front side of the first fixed piece 33. Specifically, the first fixed piece 33 is formed with a semicircular holding groove 33b that opens to the front and extends in the vertical direction. Is attached in a state of extending vertically. In the first embodiment, the half circumferential surface of the bolt exposed so as to face the front from the holding groove 33 b constitutes the holding portion 42. The holding portion 42 is provided so as to extend linearly in the vertical direction along the displacement path of the lower end (stopper portion 62) of the support arm 50 defined so as to perform approximate linear movement in the vertical direction by the link structure. . Further, the holding portion 42 comes into contact with the stopper portion 62 over a range in which the stopper portion 62 performs an approximate linear motion. Furthermore, the holding part 42 includes a plurality of holding tooth parts 44 that are unevenly formed at regular intervals in the upper and lower sides, and in the first embodiment, each holding tooth part 44 is constituted by a thread groove and a screw thread provided on the shaft of the bolt.

  The connecting arm 46 is formed so as to protrude from both the left and right sides of the rear end portion, and is coaxially formed to protrude from the pair of first boss portions 47 and 47 positioned on the left and right sides of the front end portion. A pair of second boss portions 48, 48 are provided (see FIG. 10). And the connection arm 46 fits the 1st boss | hub parts 47 and 47 in the boss holes 36 and 39 of the 1st fixed piece 33 and the 2nd fixed piece 38, respectively, and the 1st fixed piece 33 and the 2nd fixed piece 38 is rotatably connected to the upper end portion of the fixed arm 32 in a state of being sandwiched by 38.

  The support arm 50 is a long member that is curved so that the fixed arm 32 side is concave. The support arm 50 is provided with a connection portion between the connection arm 46 and the frame 20 at the upper portion and a stopper portion 62 at the lower end. The provided support part 60 is provided. The support arm 50 includes a first support piece 52 that forms the left half of the body, and a second support piece 54 that is attached to the first support piece 52 and forms the right half of the body. The connection arm 46 and the support portion 60 are sandwiched between the support piece 54 (see FIG. 10). The upper end portions of the first support piece 52 and the second support piece 54 are respectively provided with support holes 53 and 55 that are coaxially aligned, and the second boss portion 48 of the connecting arm 46 with respect to the support holes 53 and 55. , 48 are respectively fitted. As a result, the upper end portion of the support arm 50 is rotatably connected to the connection arm 46 with the first support piece 52 and the second support piece 54 sandwiching the front end portion of the connection arm 46. The first support piece 52 includes a second shaft portion 56 that is located below the connection portion with the connecting arm 46 and protrudes from the left surface facing the plate-like portion 22 of the frame 20, and this second shaft portion. By fitting 56 to the shaft recess 22 b of the frame 20, the frame 56 is rotatably connected.

  The support portion 60 is sandwiched between the first support piece 52 and the second support piece 54 by fitting both the support pieces 52 and 54 and a shaft and a hole provided corresponding to the support portion 60 to each other. The armrest body 12 is pivotally supported and can swing in the same direction as the rotation direction of the armrest body 12. The support portion 60 is provided at the rear portion facing the holding portion 42 in the contact range with the half nut facing the holding portion 42 at the open end. In the first embodiment, the nut is attached to the holding portion 42. The stopper part 62 which contacts is comprised. Further, the stopper portion 62 includes a plurality of support tooth portions 64 that are unevenly formed at regular intervals in the vertical direction. In the first embodiment, the support tooth portion 64 is constituted by a thread groove and a screw thread provided on the inner peripheral surface of the nut. (See FIG. 5). Here, the nuts forming the stopper portion 62 and the bolts forming the holding portion 42 are of the same standard and the same nominal diameter, and the stopper portions 62 are aligned with each other so as to cover the half circumferential surface of the holding portion 42. The plurality of support teeth 64 are configured to mesh with a group of the plurality of holding teeth 44. As described above, the support mechanism 30 has a link structure configured so that the stopper portion 62 moves in an approximately linear motion with respect to the holding portion 42, and an angle adjusting mechanism is configured by the stopper portion 62 and the holding portion 42 that are engaged with each other. Is done.

  The support portion 60 includes a holding posture (FIG. 5A) in which the stopper portion 62 faces the holding portion 42 in the contact range and can contact the holding portion 42, and the stopper portion 62 holds the holding portion in the contact range. It is configured to swing between a retracted posture (FIG. 9A) that is separated from 42 and cannot contact the holding portion 42. The support mechanism 30 can be held in a holding posture or a retracted posture by an elastic member 70 that biases the support portion 60. Further, the support portion 60 extends to the opposite side (front side) of the stopper portion 62 across the swing fulcrum, and a contact portion 66 sandwiched between the first support piece 52 and the second support piece 54, It is formed to extend from the lower end of the support arm 50, and is provided with a restricting portion 68 serving as an attachment site for the stopper portion 62. In the holding posture, the support portion 60 abuts the front portion of the abutment portion 66 against the front wall portion 50a provided on the front side of the abutment portion 66 in the lower portion of the support arm 50, and in the lower portion of the support arm 50. The rear wall 50b provided on the rear side of the contact portion 66 is configured so that the upper portion of the restricting portion 68 is restricted (FIG. 5A). That is, in the holding posture, the support portion 60 is restricted from swinging toward the holding portion 42 under the contact between the front and rear wall portions 50a and 50b of the support arm 50 and the contact portion 66 and the restriction portion 68. On the other hand, swinging to the side away from the holding portion 42 toward the retracted posture is allowed. The support portion 60 is configured such that the rear portion of the contact portion 66 contacts the rear wall portion 50b of the support arm 50 in the retracted posture, and the support portion 60 includes the rear wall portion 50b and the contact portion 66 in the retracted posture. Under the contact, the swing toward the side away from the holding portion 42 is restricted, while the swing toward the holding portion 42 is allowed (see FIG. 8B). The restricting portion 68 is formed so that the right side portion on the cover 26 side protrudes from the right side surface of the support arm 50 (second support piece 54).

  In the first embodiment, a torsion coil spring is employed as the elastic member 70, and one arm portion extending from the coil shaft is positioned above the contact portion 66 of the support portion 60 and connected to the first support piece 52, and the coil The other arm portion extending from the shaft is connected to the contact portion 66. Here, the connection portion of the elastic member 70 to the contact portion 66 is a line connecting the swing fulcrum of the support portion 60 and the connection portion of the elastic member 70 to the first support piece 52 (hereinafter referred to as a switching line). It is provided at a portion biased forward and backward from L1. The connecting portion of the elastic member 70 to the contact portion 66 is positioned on the front side of the switching line L1 in the holding posture of the support portion 60 (see FIG. 5), and is positioned on the rear side of the switching line L1 in the retracting posture of the support portion 60. (See FIG. 9A). The elastic member 70 is connected to the first support piece 52 and the abutting portion 66 so as to elastically urge both arm portions in a direction away from each other. Accordingly, the support unit 60 is biased toward the side toward the holding unit 42 in the holding posture (the direction in which the holding posture is maintained), and is separated from the holding unit 42 in the retracted posture (the direction in which the retracting posture is maintained). It is to be biased towards. When the support portion 60 swings between the holding posture and the retracting posture, the connecting portion of the elastic member 70 to the contact portion 66 is displaced back and forth beyond the switching line L1, so that the elastic member 70 The energizing direction is switched.

  As shown in FIG. 7, in the support mechanism 30, the load applied in the direction in which the armrest body 12 is rotated downward is perpendicular to the input direction of the force through the support teeth 64 of the stopper 62 (α = 90 °) or an obtuse angle (90 ° <α <180 °). Here, in the support mechanism 30, the load applied to the armrest main body 12 is transmitted to the support arm 50 through the connection portion with the frame 20, so the holding portion 42 at the third axis C and the stopper portion 62. A force is applied to the holding tooth portion 44 along a line (hereinafter referred to as a load input line) L2 connecting the contact point to (see FIG. 6). In addition, the holding tooth portion 44 has a linear line (the holding tooth portion 42 of the holding portion 42) along the direction in which the stopper portion 62 is displaced in the angle adjustment range. It is formed to extend at a predetermined angle with respect to the extending line L3. The support mechanism 30 is configured such that the load support angle α formed by the load input line L2 and the upper tooth surface 44a of the holding tooth portion 44 on the groove side of the holding tooth portion 44 is 90 ° ≦ α <180 °. Consists of. In the first embodiment, since the holding portion 42 is constituted by a bolt, the opening angle of the tooth surfaces 44a and 44b adjacent to the upper and lower sides of the holding tooth portion 44 including the thread groove and the screw thread is 60 °. The tooth surfaces 44a and 44b of the holding tooth portion 44 extend at an angle of 60 ° with respect to the straight line L3. Similarly, since the stopper part 62 is comprised with the nut, the opening angle of the tooth surface adjacent to the upper and lower sides of the support tooth part 64 which consists of a thread groove and a screw thread is 60 degrees.

  That is, the support mechanism 30 is configured so that the angle β formed by the load input line L2 and the straight line L3 is 30 °, so that the upper tooth surface 44a of the holding tooth portion 44 is orthogonal to the load input line L2 ( α = 90 °). Further, if the support mechanism 30 is configured such that the angle β formed by the load input line L2 and the straight line L3 is larger than 30 °, the upper tooth surface 44a of the holding tooth portion 44 is obtuse (90 ° with respect to the load input line L2. It extends in the relationship of <° <α <180 °), and the load input from the upper side acts in the direction (the bottom side of the screw groove) where the support tooth portion 64 meshes with the holding tooth portion 44 along the upper tooth surface 44a. Can be made. As described above, the support mechanism 30 is configured such that the angle β formed by the load input line L2 and the straight line L3 is 30 ° or more in the contact range. Note that the angle β formed by the load input line L2 and the straight line L3 maintains the above condition regardless of which portion of the holding portion 42 the stopper portion 62 contacts.

  On the other hand, in the support mechanism 30, the input direction of the force acting on the holding tooth portion 44 via each support tooth portion 64 of the stopper portion 62 in accordance with the upward rotation of the armrest body 12 is such that the holding tooth portion 44. The tooth surface 44b (hereinafter referred to as the lower tooth surface) facing downward is configured to have an acute angle (see FIG. 7). That is, the support mechanism 30 is configured such that the separation angle γ formed by the load input line L2 and the lower tooth surface 44b of the holding tooth portion 44 on the groove side of the holding tooth portion 44 is 0 ° <γ <90 °. Composed. Since the stopper portion 62 is linearly displaced up and down by the link structure in the contact range, when the armrest body 12 is rotated upward, the holding tooth portion 44 is moved from the support tooth portion 64 along the load input line L2. Force acts from below. Further, as described above, the lower tooth surface 44b of the holding tooth portion 44 composed of the screw groove and the thread of the bolt has a symmetrical relationship with the upper tooth surface 44a across the radial direction of the bolt. In other words, the support mechanism 30 is configured such that the angle β formed by the load input line L2 and the straight line L3 is 30 ° or more in the contact range, so that the lower end of the holding tooth portion 44 when the stopper portion 62 is displaced upward. A force acts on the tooth surface 44b in an acute angle relationship. Therefore, during the approximate linear motion along the holding portion 42, the support portion 60 is guided in the direction in which the support tooth portion 64 is removed from the holding tooth portion 44 along the lower tooth surface 44 b (the top side of the thread). The elastic member 70 swings in a direction away from the holding portion 42 against the urging force of the elastic member 70 toward the side 42. As a result, when the stopper portion 62 is displaced upward, the support tooth portion 64 is prevented from meshing with the holding tooth portion 44 of the holding portion 42, and the armrest body 12 can be smoothly rotated upward.

  The support mechanism 30 includes a switching mechanism that swings the support portion 60 to switch the posture of the stopper portion 62 with respect to the holding portion 42. Here, in the first embodiment, when the armrest body 12 is displaced upwardly from the use posture toward the retracted posture beyond the angle adjustment range, the switching is performed so as to contact the restriction portion 68 of the support portion 60 outside the contact range. The unit 40 functions as a switching mechanism (see FIG. 8). In the first embodiment, when the armrest body 12 is displaced from the retracted position to the used position, the flange 24 of the frame 20 that contacts the restriction portion 68 at the lower limit of the contact range corresponding to the lower limit of rotation of the armrest also functions as a switching mechanism. (See FIG. 9). The switching unit 40 is provided at a position that exceeds the upper limit of the contact range on the displacement trajectory of the restricting unit 68, and is provided so as to extend from the front portion of the second fixed piece 38 in the fixed arm 32 to the front side. In addition, the switching unit 40 is configured to abut against the restriction unit 68 of the support unit 60 in the holding posture, but not to contact the regulation unit 68 of the support unit 60 in the retracted posture. Then, the switching unit 40 abuts so as to prevent the path of the regulating unit 68 that is displaced upward as the armrest body rotates upward (see FIG. 8A), and moves the support unit 60 from the holding posture to the retracted posture. It swings (see FIG. 8B). In addition, the restricting portion 68 is pushed up from the lower side with the lower portion contacting the flange 24 extending downward in the frame 20 at the lower limit of rotation of the armrest body 12 (see FIG. 9A), and the support portion 60 is retracted. It is swung from the posture toward the holding posture. Here, the support portion 60 maintains the same posture under the bias of the elastic member 70 up to a predetermined range. However, when the support portion 60 is swung beyond the switching line L1, the elastic member 70 is reversely moved as described above. And is maintained in the other posture (see FIG. 9B).

[Operation of Example 1]
Next, the operation of the armrest according to the first embodiment will be described. First, the case where the armrest body 12 is angle-adjusted for use in the angle adjustment range from the lower limit of rotation will be described. In addition, the support part 60 of the support mechanism 30 is in a holding posture. The armrest 10 is supported by a plurality of support teeth 64 of the stopper portion 62 meshing with a group of holding teeth 44 positioned at the lower end of the holding portion 42 at the lower limit of the contact range corresponding to the lower limit of rotation of the armrest body 12. The downward displacement of the arm 50 is restricted. Thereby, the posture is held so that the armrest body 12 does not rotate downward (see FIG. 1). When the armrest 10 rotates the armrest body 12 upward, the lower end of the support arm 50 is linearly displaced upward along the holding portion 42. At this time, the support portion 60 swings downward and is guided by the lower tooth surface 44 b of the upper holding tooth portion 44, so that each support tooth portion 64 gets over the upper holding tooth portion 44, thereby supporting arm 50. Is allowed to move upward (see FIG. 5B). In the support mechanism 30, the support tooth portion 64 is guided along the lower tooth surface 44b and the support portion 60 swings, so that the engagement state between the support tooth portion 64 and the holding tooth portion 44 is smoothly released. . When the armrest body 12 rotates the armrest body 12 to an appropriate angle and then applies a downward force to the armrest body 12, the plurality of support teeth 64 and the corresponding holding teeth 44 are engaged with each other. Since the downward displacement of 50 is restricted, the armrest body 12 is held at the angle (see FIG. 3 or FIG. 5A). Here, the support portion 60 is urged to maintain the holding posture by the elastic member 70, and each support tooth portion 64 meshes with the upper holding tooth portion 44 corresponding to each pitch. The posture of the armrest body 12 can be adjusted at a fine angle.

  When the armrest body 12 is rotated upward toward the retracted position beyond the angle adjustment range, the armrest 10 is pivotally displaced from the holding position to the retracted position by the restricting portion 68 coming into contact with the switching portion 40. (See FIG. 8). The armrest 10 is configured such that the end of the support arm 50 on the connection portion side with the connecting arm 46 abuts on the receiving portion 32a of the fixed arm 32 and the displacement of the support arm 50 is restricted, so that the armrest main body 12 is backrested. It stops in the retracted position overlapping the side surface of the part 100a (see FIG. 4).

  When the armrest body 12 is rotated downward from the retracted posture, the armrest 10 is switched by the switching portion 40 when the support portion 60 is rotated upward from the holding posture to the retracted posture. Even if the lower end is displaced along the holding portion 42, the stopper portion 62 does not contact the holding portion 42. That is, the armrest 10 can return the armrest body 12 to the lower limit of rotation without the angle adjusting mechanism working when the armrest body 12 is rotated downward from the retracted position. The armrest 10 is engaged with the holding portion 42 by the support portion 60 being switched from the retracted posture to the holding posture by the flange 24 at the lower rotation limit (see FIG. 9). Thereby, since the downward displacement of the support arm 50 is regulated, the armrest body 12 is stopped at the lower limit of rotation. The second support piece 54 of the support arm 50 is provided with a restricting piece 54 a that protrudes to the right at a portion surrounding the support hole 55, and this restricting piece 54 a is the lower limit of rotation of the armrest body 12. By contacting the upper surface of the switching unit 40, the load applied to the support arm 50 is supported by the fixed arm 32. As described above, the armrest 10 can return the armrest body 12 to the lower limit of rotation by the switching mechanism without the user directly operating the stopper portion 62 if the armrest body 12 is rotated upward beyond the angle adjustment range. It becomes possible.

  Unlike the angle adjustment mechanism of the ratchet structure in which the rotation angle of the armrest body and the displacement angle of the ratchet pawl described in the prior art are the same, the support mechanism 30 of the link structure has the rotational displacement of the armrest body 12 at the lower end of the support arm 50. Since the linear displacement is converted, the amount of displacement of the lower end of the support arm 50 can be reduced with respect to the rotation angle of the armrest body 12. That is, the support mechanism 30 can reduce the length of the holding portion 42 provided to support the stopper portion 62. Further, the holding portion 42 may be provided so as to extend linearly corresponding to the stopper portion 62 that is linearly displaced, compared with the case where the support surface of the stopper portion 62 is formed by the peripheral surface of the disk-shaped disk. It is small and is not subject to restrictions such as installation space and shape. Therefore, even if the support mechanism 30 has an angle adjustment function, the entire support mechanism 42 including the holding portion 42 can be reduced in size, and thus can be reduced in weight.

  The armrest 10 is configured such that the posture of the armrest body 12 is held by the stopper portion 62 engaging the holding portion 42. Further, since the armrest 10 supports the load applied to the armrest body 12 by distributing it to the plurality of arms 32, 46, 50 of the support mechanism 30 via the frame 20, for example, a specific friction structure described in the prior art is specified. No high torque is applied to the part of the arm, and no stress is concentrated on the specific arm 32, 46, 50 or part. That is, the rigidity required for each of the arms 32, 46, 50, the stopper portion 62, and the holding portion 42 constituting the support mechanism 30 can be reduced, and each member can be made of synthetic resin or formed of a metal material. Even in such a case, restrictions such as thickness and shape are reduced, and further miniaturization and weight reduction can be achieved.

  The support mechanism 30 can set the distance between the axial points of the frame 20, the fixed arm 32, the connecting arm 46, and the support arm 50 while ensuring the posture displacement range of the armrest body 12. 46, 52 can be shortened. That is, the support mechanism 30 can be made compact as a whole, the support mechanism 30 can be accommodated inside the armrest body 12, and the support mechanism 30 is accommodated in the accommodating space 20a of the frame 20 as in the first embodiment. Even if it does, the armrest main body 12 does not enlarge. Further, only the mounting portion 14 is exposed to the outside of the armrest body 12, and the movable members such as the arms 46 and 50 of the support mechanism 30 are not exposed to the outside. There is no. And since the support mechanism 30 can set the distance between the axial points of each arm 32,38,46,52 comparatively short, the load which can be supported by the support mechanism 30 also improves.

  Since the armrest 10 has a small displacement amount of the stopper portion 62 per rotation angle of the armrest body 12, even if the interval between the holding tooth portion 44 and the supporting tooth portion 64 is set finely, the supporting tooth portion 64 becomes the holding tooth portion 44. It can be appropriately engaged. That is, the armrest 10 can reduce the angle adjustment interval of the armrest body 12 without increasing the size of the support mechanism 30.

  The support mechanism 30 is configured such that the inner peripheral surface of the hook-shaped stopper portion 62 covers the half peripheral surface of the cylindrical holding portion 42 and is in surface contact with each other, and a plurality of support tooth portions 64 includes a group of holding teeth. Since it is configured to mesh with the portion 44, the load supporting force due to the engagement between the stopper portion 62 and the holding portion 42 is excellent. Moreover, the support mechanism 30 is such that the positional relationship between the connection portion (third axis point C) of the support arm 50 with the frame 20 and the contact point of the holding portion 42 with the stopper portion 62 is the upper tooth surface of the holding tooth portion 44. Reasonably set for 44a. Thus, the load received by the support arm 50 from the frame 20 and input to the holding tooth portion 44 via the support tooth portion 64 of the stopper portion 62 is supported without escaping along the upper tooth surface 44a of the holding tooth portion 44. Thus, the support tooth portion 64 and the holding tooth portion 44 are reliably engaged with each other. That is, even if each support tooth portion 64 and holding tooth portion 44 are made smaller, the downward displacement of the support arm can be appropriately controlled, and the load applied to the armrest body 12 in the use posture can be suitably supported. .

  The support mechanism 30 is connected between the first fixed piece 33 and the second fixed piece 38 with the rear end portion of the connection arm 46 being sandwiched therebetween, and is connected between the first support piece 52 and the second support piece 54. Are connected across the front end of the. As a result, the support mechanism 30 can suppress the force being transmitted to the specific part among the fixed arm 32, the connecting arm 46, and the support arm 50, and can be connected to one side at the connecting portion of these arms 32, 46, 50. Concentrating stress can be avoided. Similarly, the support portion 60 is also configured to be sandwiched and connected between the first support piece 52 and the second support piece 54 so that force is uniformly applied from the stopper portion 62 to the peripheral surface of the holding portion 42. And both are difficult to come off.

  Since the fixed arm 32 has both fixed pieces 33 and 38 sandwiched between the plate-like portion 22 of the frame 20 and the cover 26, the connection arm 46 and the connection arm 46 are sandwiched between the fixed pieces 33 and 38. Even if the 1st support piece 52 pinched | interposed between the plate-shaped part 22 removes the attachment bolt 18, the assembly | attachment state of each other is maintained unless the cover 26 is removed. In addition, it is sufficient if there is a minimum space between the second support piece 54 and the cover 26 that allows the right-side extension of the restricting portion 68 in the support portion 60 to pass. The second support piece 54 is not immediately separated from the piece 52. That is, the support mechanism 30 can simplify or omit the assembling structure of the arms 32, 46, 50 or the members 33, 38, 52, 54, 60. Once these are assembled to the frame 20, the mounting bolts The entire unit can be handled without being temporarily fixed at 18.

  FIG. 12 is a side view illustrating a main part of the armrest 80 according to the second embodiment. The holding portion 82 of the second embodiment is formed along the movement trajectory of the lower end of the support arm 50 set so as to perform an approximate linear motion by a support mechanism 81 having a link structure similar to the support mechanism 30 of the first embodiment. It is a friction surface in which a plane extends. Moreover, the stopper part 84 of Example 2 is formed in the disc cam shape. The stopper portion 84 is rotatably provided in a state of being eccentric to the lower end of the support arm 50 so that the peripheral surface abuts the holding portion 82 over the range in which the stopper portion 84 moves approximately linearly. Here, the stopper portion 84 is configured such that the distance from the rotation fulcrum to the peripheral surface is shorter than the contact point of the holding portion 82 in the region above the distance from the rotation fulcrum to the contact point of the holding portion 82. (See FIG. 13). In contrast, the stopper portion 84 is configured such that the distance from the rotation fulcrum to the peripheral surface is longer than the contact point of the holding portion 82 in the region below the contact point. The stopper portion 84 is urged so as to return to the contact point. In addition, in the armrest 80 of Example 2, the same code | symbol is attached | subjected to the structure similar to Example 1, and description is abbreviate | omitted.

  The stopper portion 84 tends to be displaced downward in parallel with the holding portion 82 when the lower end of the support arm 50 is displaced in accordance with the downward rotation of the armrest body 12 in the contact range where the stopper portion 84 contacts the holding portion 82. The distance from the rotation fulcrum to the peripheral surface becomes long and the distance from the holding portion 82 cannot be rotated. That is, since the displacement of the support arm 50 is restricted, the posture of the armrest body 12 is maintained. On the other hand, when the stopper portion 84 is displaced at the lower end of the support arm 50 accompanying the upward rotation of the armrest body 12, the distance from the rotation fulcrum to the peripheral surface is shortened, and the upper portion of the support arm 50 is allowed. That is, the armrest body 12 can be rotated upward to adjust the angle. As described above, according to the configuration of the second embodiment, the downward displacement can be regulated at an arbitrary position while the stopper portion 84 is in contact with the holding portion 82, so that the angle of the armrest body 12 can be adjusted steplessly. Moreover, even with the configuration of the second embodiment, it is possible to enjoy the advantages of adopting the link structure described in the first embodiment.

(Example of change)
The present invention is not limited to the above-described embodiments, and the following configurations can also be employed.
(1) Although the armrest of the embodiment has been described for the case where it is disposed in the driver's seat, it may be disposed in the passenger seat or the rear seat.
(2) Like the support mechanism 90 of the modified example shown in FIG. 14, the support arm 50 is juxtaposed on the rear side of the fixed arm 32, and the fixed arm 32 is disposed below the connection portion between the fixed arm 32 and the frame 20. A connection portion with the connection arm 46 may be provided, and a connection portion between the support arm 50 and the connection arm 46 may be provided below the connection portion between the support arm 50 and the frame 20. That is, the support mechanism 90 of the modified example has a configuration in which the support mechanism 30 of the first embodiment is inverted upside down, and the connecting arm 46 extends below the node of the frame 20. In the modified support mechanism 90, the stopper portion 62 is provided at the upper end of the support arm, and the holding portion 42 is provided in the upper region of the fixed arm 32. In addition, even the support mechanism 90 of the modified example shows the same effect as the embodiment.
(3) In the embodiment, the fixed arm is provided as the fixed portion that is provided so as not to rotate with respect to the seat. However, the attachment portion may be used as the fixed portion. Moreover, you may provide separately the fixing | fixed part which supports a flame | frame, and the fixing | fixed part in which a holding | maintenance part is provided.

It is a side view which shows the principal part of the armrest which concerns on suitable Example 1 of this invention, Comprising: The case where an armrest main body exists in a rotation minimum is shown. It is the XX sectional view taken on the line of FIG. It is a side view which shows the principal part of the armrest of Example 1, Comprising: The case where an armrest main body exists in a use attitude | position is shown. It is a side view which shows the principal part of the armrest of Example 1, Comprising: The case where an armrest main body exists in the storing attitude | position of a rotation upper limit is shown. It is a side view which expands and shows the principal part of the support mechanism of Example 1, Comprising: (a) shows the case where a downward load is applied to an armrest main body, (b) rotates an armrest main body upward. Show the case. It is a side view which cuts and shows a part of principal part of the support mechanism of Example 1. It is the Y section enlarged view of FIG. It is a side view which shows the support mechanism of Example 1, Comprising: (a) shows the state which the control part contact | abutted to the switch part, (b) shows a support part by contact | abutting with a control part and a switch part. The state which switched from the holding | maintenance attitude | position to the retracted attitude | position is shown. It is a side view which shows the principal part of the armrest of Example 1, Comprising: The case where an armrest main body is returned from the angle adjustment range outside to a rotation minimum is shown, (a) is in the middle of the downward rotation in the angle adjustment range. Yes, (b) shows the situation where the armrest body has reached the lower limit of rotation. It is a perspective view which decomposes | disassembles and shows the armrest of Example 1. FIG. It is a perspective view which shows the support mechanism of Example 1. FIG. It is a side view which shows the principal part of the armrest of Example 2. FIG. 6 is a side view showing a main part of a support mechanism of Example 2. It is a side view which shows the principal part of the support mechanism of the example of a change. It is a side view which shows the armrest attached to the backrest part of a driver's seat.

Explanation of symbols

12 armrest body, 22 plate-like part, 26 cover, 30, 81 support mechanism,
32 fixed arm (fixed part), 33 first fixed piece, 38 second fixed piece, 40 switching part,
42,82 holding part, 44 holding tooth part, 44a tooth surface, 46 connecting arm,
50 support arm, 52 first support piece, 54 second support piece, 62,84 stopper part,
64 support teeth, 70 elastic members, 100 sheets

Claims (9)

An armrest having a support mechanism (30, 81) for rotatably supporting the armrest body (12) with respect to the seat (100),
The support mechanism (30, 81)
A fixing part (32) provided non-rotatably with respect to the seat (100) and rotatably supporting the armrest body (12);
A coupling arm (46) rotatably connected to the fixed part (32);
A support arm (50) that is rotatably connected to the coupling arm (46) and is rotatably connected to the armrest body (12);
A holding portion (42, 82) provided non-rotatable with respect to the seat (100) and extending linearly in a direction intersecting the rotation center axis of the armrest body (12);
The support arm configured to be displaced along the holding portion (42, 82) by a link structure defined by the arrangement of the connection portion of the armrest body (12) and each arm (32, 46, 50) ( 50), provided with one end of the stopper portion (62, 84) that contacts the holding portion (42, 82),
The support mechanism (30, 81) is configured so that the support arm (50) is displaced in a direction in which the armrest body (12) rotates upward, and the stopper portion (62, 84) is provided with the holding portion (42, 82). In the direction of displacement of the support arm 50 in the direction in which the armrest body 12 rotates downward, the stopper portion (62, 84) and the holding portion (42). , 84), the armrest body (12) is configured to be able to maintain the posture over a contact range in which the armrest body (12) is engaged.   The stopper portion (62) has a holding posture capable of coming into contact with the holding portion (42) in the contact range, and is separated from the holding portion (42) in the contact range and contacts the holding portion (42). The armrest according to claim 1, wherein the armrest is configured to be displaceable between a retractable posture that cannot be contacted. The holding portion (42) includes a plurality of holding tooth portions (44) arranged in parallel in the displacement direction of one end of the support arm (50) in the contact range,
The said stopper part (62) is provided facing the said holding | maintenance part (42), and is provided with the several support tooth part (64) which meshes | engages with the said several holding tooth part (44). Armrest described.   The support mechanism (30) is configured such that a load applied via the support tooth portion (64) in a direction in which the armrest body (12) is rotated downward is applied to the tooth surface (44a) of the holding tooth portion (44). The armrest according to claim 3, wherein the link structure is configured so that the link structure is input at a right angle or an obtuse angle guided to the groove side of the holding tooth portion (44) along the tooth surface (44a).   The armrest according to claim 2, wherein the support mechanism (30) includes an elastic member (70) that urges the stopper portion (62) toward the holding posture in the contact range.   The support mechanism (30) is provided in a portion exceeding the upper limit of the contact range on the displacement locus of the stopper portion (62), and is a stopper in the holding posture when the armrest body (12) is rotated upward. The armrest according to claim 2 or 5, further comprising a switching section (40) for displacing the section (62) to a retracted posture. The stopper portion (84) is rotatably provided eccentric to the support arm (50) so that a peripheral surface thereof contacts the holding portion (82) in the contact range.
In the contact range, the stopper portion (84) has a long distance from the rotation fulcrum to the peripheral surface in the displacement direction of one end of the support arm (50) accompanying the downward rotation of the armrest body (12). The distance between the rotation fulcrum and the peripheral surface in the displacement direction of one end of the support arm (50) accompanying the upward rotation of the armrest body (12) The armrest according to claim 1, wherein the armrest is configured so as to allow displacement of the support arm (50) facing a portion where the length of the arm becomes shorter.   The connecting arm (46) is sandwiched and connected between a first fixed piece (33) and a second fixed piece (38) constituting the fixed portion (32), and the support arm (50). The armrest according to any one of claims 1 to 7, wherein the armrest is sandwiched between and connected between a first support piece (52) and a second support piece (54) that constitute the structure.   The fixing portion (32) includes a plate-like portion (22) of the armrest body (12) to which the fixing portion (32) and the support arm (50) are connected, and the fixing portion (32) and the arm ( The armrest according to claim 8, wherein the armrest is sandwiched between a cover (26) that covers 46, 50) and is assembled to the armrest body (12).

Images