JP4904491B2 - Armrest device - Google Patents

Description

The present invention is mounted on the side of a support made up of a car seat, toilet toilet, furniture or office chair, etc., and is rotated substantially from the stowed position upright or down. More particularly, the present invention relates to an armrest device capable of adjusting an angle in the vicinity of a use position.

  As an armrest device, the angle can be fine-tuned according to the user, it can be used as it is pulled down from the storage position without operating the operation lever, etc., and it can be stored as it is by rotating it in reverse However, there is a demand for one that is easy to use. As conventional examples of such armrest devices, those described in Patent Documents 1, 2, and 3 are known.

  In the armrest device described in Patent Document 1, a disk having ratchet teeth on a part of its peripheral surface is fixed to the armrest body, the mounting plate is fixed to the support shaft of the armrest body, and the disk and the mounting plate In this structure, the control member is rotatably supported. The control member has a plate shape in which a pair of arms and an operation unit are formed, and is pressed against the surface of the disk so as to be able to follow the rotational movement of the disk.

Furthermore, the ratchet claw having a claw portion located in the same plane as the disk and a follower portion located in the same plane as the operation portion of the control member is mounted in a state of being urged in a direction to engage with the ratchet teeth. The plate is rotatably supported. Further, the rotation angle of the control member is limited by interposing a stopper of the mounting plate between the pair of arms of the control member, so that when the control member is at one movable limit, the operation unit to the control member The follower portion of the ratchet claw is lifted, and the claw portion of the ratchet claw is retracted from the ratchet teeth with the rotation thereof.

  The armrest device described in Patent Document 2 is formed in a chrysanthemum shape on the opposite surface, and in the reverse rotation direction, a fixed scorpion and a rotary scorpion that engage with a plurality of saw teeth whose mutual rotation is regulated are respectively provided. The mounting shaft is fixed and loosely fitted, and one of the fixed and rotating seats is movable in the axial direction and is urged to the other side by a spring, and the fixed seat is loosely fitted on the mounting shaft.

  Then, a control plate that follows and rotates with a predetermined angle delayed by the rotation of the rotating constellation in the positive rotation direction is provided. Alternatively, the rotary plate is pushed away from the spring force to disengage the saw teeth and moved on the fixed plate, and in this state, the rotary plate is rotated in the reverse direction, so that the control plate is rotated at a predetermined angle. The follower rotates with a delay and engages with the fixed star, and the fixed or rotating star is returned by the force of the spring so that the saw-tooth engages.

  In the first embodiment described in Patent Document 3, a mechanism for adjusting a hinge element such as an armrest is described. In this adjustment mechanism, as shown in FIG. 2 of the same document, the ratchet and the crown 2 are provided with teeth on the peripheral sector of the surface facing each other, and the area (groove shape) in which the disk-shaped part acting as the ratchet is reduced is controlled. A separator having a section, inserted through the shaft between the ratchet and the crown, stays in the control section and keeps the ratchet and crown teeth separated, the separator is guided externally on the crown and is continued by the spring It has come to be pushed.

  Further, as shown in FIG. 8 of the same document, the hinge element adjusting mechanism in the second embodiment described in Patent Document 3 is a ring-shaped piece having a protrusion in which a separator stays in a window formed in a crown. The separator is linked to an external control element that has a wedge shape for manual operation.

  Furthermore, the adjustment mechanism of the hinge element in the third example described in Patent Document 3 includes axial protrusions that move within corresponding slots formed in the ratchet, as shown in FIG. , Supplemented by a separator formed by a ring having a pair of diametrically opposed sides and an external arm. On the other hand, the arm is located in a complementary housing formed on the crown, and rotation of the ratchet during the adjustment phase can keep the separator stationary, establishing a different position between the ratchet and the crown. Folding or adjusting different positions of the hinge element adjustment mechanism is such that the separator protrusion is restricted to one of the ratchet slot ends, causing the separator to drag, and the corresponding ratchet for each press and crown This position is maintained until an angular displacement occurs that causes the axial movement to occur. Thereby, the separation between both parts allows the resetting of the mechanism.

Also, the crown housing has one of its inclined walls that terminate in a flat section with a step, from which another flat section is formed at a higher level than the flat section. Thus, the separator is raised along the inclined wall until the rotation of the separator reaches the flat section, and this axial movement of the separator causes the ratchet to move axially with respect to the crown, disengaging both parts. . Also, the end or outlet of the inclined wall of the housing corresponding to the crown has a small ridge that holds the separator during resetting of the mechanism and is configured to prevent friction effects between the ratchet and the separator. Yes.
Japanese Patent No. 2582264 JP 2005-186858 A Special table 2003-520156 gazette

  However, in the structure described in Patent Document 1, since a load is applied to one ratchet claw, the load on the ratchet claw is large and the durability is inferior. In order to lighten the load, it is necessary to enlarge the ratchet pawl, which increases the adjustment angle and deteriorates usability. In addition, since the control member is caused to rotate with friction, the control member is likely to be worn, thereby causing problems such as unstable operation.

  In the structure described in Patent Document 2, a structure in which a plurality of saw teeth formed in a stationary and rotating Kiza is meshed with each other, the pressure increase due to one-point engagement is eliminated, and the pitch of the saw teeth can be reduced. However, in order to rotate the control plate with a predetermined angle delay, a part of the circumference of the sawtooth of the rotary seat is missing about 40%, which increases the load on the tooth and increases durability. There was a problem of being inferior.

  In the structure of the first embodiment in Patent Document 3, a reduced area control section is required for the separator to enter between the ratchet and the crown, so that a portion in which the ratchet and crown teeth are missing occurs. There is a problem that the load applied to the tooth becomes large and the durability is inferior.

  The structure of the second embodiment in Patent Document 3 has a problem that the operability is inferior because the separator needs to be manually operated with a wedge (external controller).

  In the structure of the third embodiment in Patent Document 3, since the angle delay and the drag operation are performed by the protrusion of the separator and the slot formed in the ratchet longer than the protrusion, the hinge element, for example, the substantially horizontal of the armrest is used. If there is no non-lockable range from the use position to the retracted position along the substantially vertical backrest in the same rotational direction after the angle adjustable range (lock range) in the vicinity of the horizontal, the operation is not repeated. Therefore, the present invention can be applied to an armrest that rotates from a substantially vertically upward storage position to a substantially horizontal use position.

  However, when applied to an armrest that pivots from a substantially vertically downward storage position to a substantially horizontal use position, an intermediate angle (angle adjustment in the vicinity of the horizontal) when pulling down from a substantially horizontal use position to a downward storage position At the lower limit of the possible range, the separator arm abuts against the end wall of the housing, and the separator rotates to be locked, so that further inconvenience is impossible. In this case, it is conceivable to extend the length of the slot so that the armrest can be further rotated to the downward storage position. In this case, the armrest is pulled up from the downward storage position to the substantially horizontal use position. When the ratchet and crown are engaged with each other (ratchet operation), a meshing sound (clicking sound) is generated over the entire area, which causes a problem in that the quietness in the vehicle or in the room is impaired. In other words, the structure disclosed in Patent Document 3 has a problem in that it cannot be applied to an apparatus that adjusts the angle in the vicinity of the horizontal and stores it vertically below.

  Further, in the third embodiment of Patent Document 3, a ratchet having a cross-shaped disk mounting hole and a plurality of slots, a crown having a pair of housings having raised portions, stepped portions, inclined walls, and the like, and The entire structure is complicated and heavy, such as a ring-shaped separator having arms and protrusions, and there is a problem that the weight increases and the cost increases.

  The present invention has been made to solve such problems, and can be rotated from a normal, substantially horizontal use position to a retracted position in either an upright or downward inverted position with a simple structure. Another object of the present invention is to provide an armrest device that can be finely adjusted in use angle in the vicinity of the horizontal, is easy to operate, is quiet and smooth, and has safety and durability.

  In order to achieve the above object, an armrest device according to a first aspect of the present invention includes a rotation side member that is rotatably mounted around a support shaft of a support and supports the rotation of the armrest body, and the rotation side. The fixed side member that is attached to the support shaft so as to be movable in the axial direction in a state of being rotationally restrained while facing the member, and meshing with each other over the entire circumference of the rotating side member and the opposing portion of the fixed side member A serrated locking tooth that locks the armrest body at a predetermined angle; an elastic member that biases the locking teeth of the rotating side member and the stationary side member to mesh with each other; and a concentric shape with the support shaft A plurality of guide grooves each having an arc shape having a predetermined length, and a guide provided on one of the rotation side member and the fixed side member; and the inside of the guide groove as the rotation side member rotates. Sliding compound And a plurality of engaging projections provided on the other of the rotating side member or the fixed side member so as to engage with each sliding piece, and the guide has a plurality of different heights. A step portion is formed, and when the engaging projection abuts on the step portion having a different height, the fixed side member is reciprocated in the axial direction to engage or release the lock teeth. Features.

  The invention according to claim 2 is the armrest device according to claim 1, further comprising a sub urging member that urges the sliding piece to press against the end face of the guide groove.

  Invention of Claim 3 is an armrest apparatus of Claim 1 or 2, Comprising: The said level | step-difference part has three steps, low, middle, and high, and it is low by the said engagement protrusion engaging. The step portion meshes with the lock teeth, the intermediate step portion releases the lock teeth, and the high step portion stops the rotation of the rotation side member.

  A fourth aspect of the present invention is the armrest device according to any one of the first to third aspects, wherein the sliding piece has substantially the same height as the intermediate stepped portion.

  The invention according to claim 5 is the armrest device according to any one of claims 1 to 3, wherein the sliding piece has a height lower than that of the intermediate stepped portion.

  A sixth aspect of the present invention is the armrest device according to any one of the first to fifth aspects, wherein at least two of the guide grooves are arranged on one or a plurality of circumferences that are concentric with the support shaft. A plurality of engaging protrusions are provided at symmetrical positions, and the engaging protrusions are opposed to the respective guide grooves.

  A seventh aspect of the present invention is the armrest device according to any one of the first to sixth aspects, wherein the engaging projection is cut obliquely from the rotating side member or the fixed side member toward the guide groove. It is characterized by being a raised diagonal cut.

  According to the first aspect of the present invention, when the armrest body is rotated within a predetermined angle range from the substantially horizontal use position to the storage position direction, the angle is adjusted by locking each saw tooth of the lock teeth. Further, the lock teeth are unlocked by continuing rotation in the storage position direction exceeding the predetermined angle range or reverse rotation in the reverse direction in the use position in the middle. On the contrary, it can rotate freely in the unlocked state even from the storage position to the use position direction. These improve usability. In such an invention, the angle of the vicinity of the horizontal use position can be adjusted, and an armrest such as a vehicle seat or an office chair having a position stood upward with the upper direction as the unlocking range. In addition to being applicable as a device, the angle of the vicinity of the horizontal use position can be adjusted, and the armrest device such as a toilet or playground chair that has a position that is inverted downward with the downward direction as the unlocking range is stored. The scope of application can be greatly expanded.

  In addition, since lock teeth are provided on the entire circumference of the rotation side member and the fixed side member and a load applied to the armrest body is received by the lock teeth, a large load can be received, and safety and durability can be improved. . For this reason, by making the lock teeth finer and increasing the number of teeth, both safety and durability can be secured, and further finer angle adjustment can be performed in the vicinity of the use position of the armrest body.

  Further, since the fixed side member is moved in the axial direction while being supported at two or more points by the plurality of engaging protrusions, there is no galling with the support shaft due to the inclination of the fixed side member, and the operation is smooth. Thus, since the fixed side member is not moved depending on friction, there is an effect that a stable operation is ensured and durability is excellent.

  According to the invention of claim 2, in addition to having the same effect as that of the invention of claim 1, the sub biasing member presses the sliding piece against the end face of the guide groove, so that the sliding piece is moved. There is no need to provide the sliding piece with a convex part for engaging the engaging protrusion with the sliding piece, the movement of the armrest body becomes smooth, and the usability can be further improved.

  According to the invention of claim 3, in addition to having the same effects as those of the inventions of claims 1 and 2, when the engaging projection is engaged with a low step portion, the rotation side member and the stationary side member The lock teeth mesh with each other, and the angle adjustment in the vicinity of the use position of the armrest main body becomes possible. Further, when the engaging protrusion is engaged with the intermediate stepped portion, the fixed side member is separated from the rotating side member to release the engagement of the lock teeth, and when the engaging protrusion is engaged with the high stepped portion, the armrest body With mechanical control operations such as restricted rotation, angle adjustment near the horizontal use position of the armrest body and free rotation in other angle ranges can be performed reliably, ensuring reliability in use. Can be secured.

  According to the invention of claim 4, in addition to having the same effects as those of the inventions of claims 1 to 3, since the sliding piece is substantially the same height as the intermediate step portion, the engaging projection is the intermediate step. It becomes easy to move to both the part and the sliding piece. For this reason, the fixed side member is separated from the rotation side member to release the engagement of the lock teeth, and it is possible to ensure the reliability of reliably performing the free rotation outside the angle adjustment range in the vicinity of the horizontal use position described above. .

  According to the invention of claim 5, in addition to having the same effects as those of the inventions of claims 1 to 3, since the sliding piece has a lower height than the intermediate step portion, the engaging projection is the sliding piece. At the same time, the sliding piece moves away from the engaging projection and enters the free state, so that the sliding piece is pushed back until it comes into contact with the end face of the guide groove by the urging force of the urging member. Thus, the armrest body can be reliably reset to the use position.

  According to the invention of claim 6, in addition to having the same effects as those of the inventions of claims 1 to 5, by one or a plurality of concentric circles, a plurality of sliding pieces and engaging protrusions engaged with them. Since the fixed side member is moved in the axial direction while being supported at a plurality of locations, there is no galling with the support shaft due to the inclination of the fixed side member, and a smoother operation can be secured and stable operation can be performed. it can.

  According to the invention of claim 7, in addition to having the same effect as the invention of any one of claims 1 to 6, since the engagement protrusion is an oblique cut and raised, The structure and processing are simple and rich in elasticity, and the engagement and sliding between the stepped portions of the guide groove and the sliding piece are smoothly performed without generating an impact. For this reason, a smoother and more stable operation of the armrest can be ensured.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In each embodiment, the same member is assigned the same reference numeral.

(First embodiment)
1 to 15 show a first embodiment of the present invention in which an armrest device is applied to an automobile seat, FIG. 1 is a side view of an automobile seat to which an armrest device 1 is attached, and FIG. 3 is a partially broken front view, FIG. 3 is a partially broken side view of FIG. 2, FIG. 4 is a sectional view taken along line AA in FIG. 2, and FIGS. , DD and EE sectional views, FIG. 9 is a sectional view taken along line FF in FIG. 7, FIG. 10 is a sectional view taken along arrow G in FIG. 9, and FIGS. is there.

  In this embodiment, an armrest device (hereinafter also abbreviated as “armrest”) 1 is rotatably mounted on a side surface of a seat back 2 as shown in FIG. The armrest device 1 is used while being lowered to a substantially horizontal position, and is stored in a standing manner at a position along the back surface of the seat back 2 (position indicated by a two-dot chain line in FIG. 1) when not used. As shown in FIG. 2, the armrest device 1 generally includes an armrest body 3 that is used by a person on the elbow and a lock mechanism 4 that rotationally locks the armrest body 3.

  As shown in FIG. 3, the armrest body 3 includes an inside arm 3a and an outside arm 3b made of a thin steel plate formed into a U-shaped cross section by press molding or the like, and these are abutted and crimped or screwed. As a result, a closed cross-sectional structure with a hollow interior is obtained.

  As shown in FIGS. 3, 4, and 7, the lock mechanism 4 includes a support shaft 5, a rotation side member 6, a fixed side member 7, an elastic member 8, a guide 9, a sliding piece 10, a fixed plate 12, and a washer 13. And a nut 14.

  The support shaft 5 has a threaded portion 5a from the seat back 2 side, a spline portion 5b having a star-shaped cross section whose tooth profile is processed on the outer periphery, a cylindrical portion 5c, a flange portion 5d, a hexagonal column portion 5e, and a tip portion 5f. The nut 14 is fixed to the side plate 2a of the seat back 2 through the screw portion 5a.

  As shown in FIGS. 4 and 5, the fixed plate 12 is a press-formed product of a steel plate, for example, and is splined by being pressed into the spline portion 5 b of the support shaft 5, and the leg portion 12 a of the fixed plate 12 is seat back 2 is inserted into the hole 2b of the side plate 2a. Accordingly, the support shaft 5 is fixed with its rotation restricted with respect to the seat back 2.

  The cylindrical portion 5c of the support shaft 5 is inserted into the rotation side member 6 and the inside arm 3a, and the rotation side member 6 and the arm 3 are rotatably supported by the support shaft 5 by this insertion. The rotation side member 6 and the inside arm 3a are sandwiched between the flange portion 5d of the support shaft 5 and the fixed plate 12, and are assembled so as not to cause lateral play. The rotation-side member 6 has a circular outer shape, and the convex portions 3c of the inside arm 3a are inserted into a plurality of (two in the drawing) holes 6c provided in the disc portion as shown in FIGS. By being engaged, it is integrated with the inside arm 3a. Thereby, the rotation side member 6 rotates integrally with the armrest main body 3.

  The fixed side member 7 is disposed so as to face the rotation side member 6, has a circular outer shape with the same diameter as the rotation side member 6, and has a hexagonal column portion 5 e of the support shaft 5 at its center. A slightly larger hexagonal hole 7b is formed. 4 and 8, the hexagonal column portion 5e of the support shaft 5 is inserted into the hexagonal hole 7b of the fixed side member 7, whereby the fixed side member 7 is restrained from rotating and is axially moved. Is attached to the support shaft 5 in a state in which the movement of is possible.

  The rotation-side member 6 and the stationary-side member 7 are, for example, press-formed products of thin steel plates, and are formed with lock teeth 6g and 7g that mesh with each other over the entire circumference of the facing portion. The lock teeth 6g and 7g are formed in a sawtooth shape. In FIG. 2, when the armrest body 3 rotates in the counterclockwise direction, the vertical surfaces 6h and 7h of the lock teeth 6g and 7g mesh with each other. When it rotates in the clockwise direction, it slides on the inclined surfaces 6i, 7i of the lock teeth 6g, 7g and moves in the direction (axial direction) in which the stationary member 7 is separated. That is, the saw-toothed lock teeth 6 g and 7 g are formed so as to enable the ratchet rotation of the rotation side member 6 with respect to the fixed side member 7. As shown in FIGS. 6 and 9, the disk portion of the rotation side member 6 has two oblique cuts 6 a that are arranged axisymmetrically on one first circumference C <b> 1 concentric with the support shaft 5. Is formed toward the fixed member 7 side.

  The elastic member 8 is formed of a coiled compression spring, and is disposed between the fixed side member 7 and the washer 13 fixed to the front end portion 5f of the support shaft 5 by caulking. It is energized in the direction to press against. Due to the biasing of the elastic member, the lock teeth 6g and 7g are engaged with each other.

  As shown in FIG. 9, the guide 9 is snapped by a plurality of holes 7 a formed in the opposing surface on the rotating side member 6 side in the disk portion of the fixed side member 7 and the convex portions 9 a provided in the guide 9. The guide 9 and the fixed side member 7 are integrated with each other.

  As shown in FIG. 7, the guide 9 is formed with two guide grooves 9b symmetrically with respect to the first circumference C1 for guiding the sliding piece 10. The guide groove 9b is located at a position corresponding to the oblique cut and raised 6a, that is, on the first circumference C1, and has a reverse T-shaped cross section that loosely fits so that the sliding piece 10 does not come off as shown in FIG. Each is formed. The two guide grooves 9b are formed in a range in which the sliding piece 10 can move in the first circumferential direction C1 by a predetermined angle, for example, an angle corresponding to the rotation angle 45 ° of the armrest 1. In this case, the diagonally cut and raised 6a is in a sliding or engaging relationship with a guide 9 or a sliding piece 10 having a guide groove 9b as will be described later, and thereby becomes an engaging protrusion that engages with these. ing. For this reason, the width of the obliquely raised parts 6a in the concentric radial direction (the first circumferential C1 direction) is set to be larger than any of the arcuate guide grooves 9b or the sliding piece 10 in the radial direction. Yes.

  As shown in FIGS. 9 to 15, the guide 9 is formed with three arc-shaped step portions along the first circumference C1. The step portion is formed in a step shape having three steps of the lowest step portion 9d, the intermediate step portion 9e, and the highest step portion 9f.

  The height of the intermediate stepped portion 9e in the guide 9 is such that when the diagonally raised portion 6a of the rotating side member 6 rides on the intermediate stepped portion 9e, the fixed side member 7 is moved along the hexagonal column portion 5e of the support shaft 5 in the axial direction. It is set to a height sufficient to move and release the engagement of the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7. The height of the lowest step portion 9d is set to a height that does not interfere with the diagonally raised portion 6a when the locking teeth 6g, 7g of the rotating side member 6 and the stationary side member 7 are engaged. The maximum step portion 9f is set to a height that serves as a stopper that stops the movement (rotation) of the rotation-side member when the diagonally raised portions 6a of the rotation-side member 6 abut.

  The sliding piece 10 is slidable in the arc-shaped guide groove 9b described above, and an end portion thereof (for example, a distal end portion in the clockwise direction in FIG. 7) is as shown in FIGS. The convex portion 10a is obliquely cut and formed on the upper surface 10e which is a surface facing the 6a side. The convex part 10a is formed in, for example, an arc shape so that the front and rear are inclined so that the diagonally raised part 6a can be easily climbed and the top is slid smoothly. In this embodiment, it is desirable that the upper surface 10 e of the sliding piece 10 be formed at the same height as the intermediate step portion 9 e of the guide 9. The reason for this is that, as will be described later, the oblique cut-and-raised portion 6a of the rotation-side member 6 is easily transferred to both the intermediate step portion 9e of the guide 9 and the upper surface 10e of the sliding piece 10.

  Next, the operation of this embodiment will be described with reference to FIGS. In these drawings, (a) is an operation explanatory diagram corresponding to FIG. 9, and (b) is a schematic diagram of the operation corresponding to FIG.

  The lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7 have a sawtooth shape as shown in FIG. 3 and described above. Therefore, a direction in which force is applied to the inclined surfaces 6i and 7i of the lock teeth 6g and 7g (see FIG. (Clockwise direction in FIG. 1), the slopes 6i and 7i slide relative to each other and the locking teeth 6g and 7g move away from the elastic member 8 so that the fixed side member 7 is moved away from the hexagonal column portion 5e of the support shaft 5e. So that the armrest body 3 can be moved one tooth at a time. On the other hand, against the force in the reverse direction (counterclockwise direction in FIG. 1), the armrest body 3 to which the rotation side member 6 is fixed is engaged with the vertical surfaces 6h and 7h of the lock teeth 6g and 7g. Locking is performed by a fixed-side member 7 fixed to the support shaft 5.

  Accordingly, the rotation angle of the armrest body 3 can be adjusted for each of the lock teeth 6g and 7g within a predetermined range in the direction of standing from a substantially horizontal position, for example, 45 °, and the predetermined angle in the direction of standing up the armrest body 3 When it rotates past the range, the lock is released, and the lock teeth 6g and 7g can be rotated freely from the position to the storage position without being contacted. Further, the armrest body 3 can be returned to the free state with the lock teeth 6g and 7g separated from the unlocked position to the retracted position to the substantially horizontal position. This operation will be described below.

  FIG. 11 shows a state where the armrest body 3 is pulled down to a substantially horizontal position. In this state, the lock teeth 6g and 7g of the rotation side members 6 and 7 are engaged with each other (FIG. 3), and the rotation side member 6 is obliquely raised and raised 6a slightly from the lowest step portion 9d of the guide 9. In the position.

  FIG. 12 shows a state in which the armrest body 3 starts to be pulled up (stand up) in the clockwise direction from the use state of FIG. When the armrest body 3 is rotated in the clockwise direction, as shown in FIG. 12A, the locking member 7g of the stationary member 7 gets over the locking tooth 6g of the rotating member 6, thereby urging the elastic member 8. The rotation side member 6 rotates in the L direction while being pushed in the direction of separation against the movement and moving upward (along the hexagonal column 5e of the support shaft 5) shown in FIG. At this time, the diagonally cut and raised 6a does not move up to the amount over the convex portion 10a of the sliding piece 10, but moves to the right in the drawing along with the sliding piece 10 (that is, the timepiece in FIG. 12B). Rotate around).

  At this stage, when the armrest body 3 is released and stopped or rotated counterclockwise, the stationary member 7 is pushed back toward the rotating member 6 by the biasing force of the elastic member 8 and is again rotated. And the lock teeth 6g and 7g of the stationary member 7 are engaged with each other, and the counterclockwise rotation is locked.

  FIG. 13 shows a state in which the armrest body 3 is pulled up (stands up) from the state of FIG. 12 in a clockwise direction to a predetermined angle, for example, around 45 °. A predetermined angle at which the right end surface 10b of the sliding piece 10 abuts against the end surface 9g of the guide 9, for example, the rotation side member 6 fixed to the armrest body 3 to the 45 ° position of the armrest body 3 rotates while repeating the movement in FIGS. . At this time, since the sliding piece 10 is obliquely raised and separated from the 6a and becomes free in the guide groove 9b, the sliding piece 10 first moves to a position where it abuts against the right end face 10b of the sliding piece 10 and the end face 9g of the guide 9. However, regardless of the position of the sliding piece 10, the rotation side member 6 can rotate in the same manner as in FIG. 12 described above up to a predetermined angle, for example, the 45 ° position of the armrest body 3.

  That is, in the rotation range from the substantially horizontal use state in FIG. 11 to a predetermined angle (for example, 45 °) in FIG. 13, the lock teeth 6 g of the rotation side member 6 and the fixed side member 7 are clockwise in the armrest body 3. , 7g get over each other and rotate, and in the counterclockwise direction, the lock teeth 6g, 7g are engaged with each other and locked. In this range, an angle adjustable range in which the angle can be adjusted for each of the lock teeth 6g and 7g of the armrest body 3 by so-called ratchet rotation.

  FIG. 14 shows an unlocked state in which the armrest body 3 is pulled up (stands up) by a predetermined angle, for example, 45 ° or more in the clockwise direction from the pulled state of FIG. When the armrest body 3 is further rotated in a clockwise direction from a predetermined angle, for example, 45 °, the sliding piece 10 does not move in a state where it abuts against the end surface 9g of the guide 9, so It moves over the part 10a. At this position, the diagonally raised portion 6a rides on the upper surface 10e of the sliding piece 10 having the same height as the intermediate step 9e of the guide 9, so that the lock teeth 6g and 7g of the rotating side member 6 and the fixed side member 7 are completely , The armrest body 3 is unlocked and is free to rotate. From this position, the armrest body 3 can be rotated (stand up) to the storage position in the unlocked state, or can be reversely rotated back to the substantially horizontal position (pulled down).

  FIG. 15 shows a state in which the armrest body 3 starts to be pulled down counterclockwise again from the unlocked state of FIG. When the armrest body 3 is to be pulled down from the position of FIG. 14 to a substantially horizontal position, the rotation side member 6 rotates in the M direction in FIG. 15A, that is, in the counterclockwise direction in FIG. In the movement in the M direction, the oblique cut and raised 6a has its tip abutted against and engaged with the convex portion 10a of the sliding piece 10, so that the sliding piece 10 moves while being dragged. When the armrest body 3 reaches a substantially horizontal position, the left end surface 10 c of the sliding piece 10 abuts against the end surface 9 h of the guide 9.

  When the armrest body 3 is further rotated in the direction M in FIG. 15, the diagonal cut 6 a gets over the convex portion 10 a of the sliding piece 10 to be in the state of FIG. 11. In this state, the fixed side member 7 is pushed back to the rotation side member 6 by the biasing force of the elastic member 8, and the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7 can be engaged with each other again. The counterclockwise direction of the armrest body 3 is locked.

  As shown in FIGS. 11 and 15, the height of the sliding piece 10 and the height of the intermediate step 9 e of the guide 9 are approximately the same. For this reason, the diagonally raised parts 6a reliably ride on and continuously slide on both the upper surface 10e of the sliding piece 10 and the intermediate step part 9e of the guide 9, so that the armrest body 3 is moved from the position shown in FIG. Rotate (stand up) to the storage position in the unlocked state, reversely return (lower) to the substantially horizontal position, or return the armrest body 3 from the storage position to the substantially horizontal position in the unlocked state. (Lower). Thereby, the reliability of the free rotation operation of the armrest body 3 is ensured.

  When the armrest body 3 is rotated leftward in FIG. 11 (a) (counterclockwise direction in FIG. 11 (b)) or rightward in FIG. 14 (a) (clockwise direction in FIG. 14 (b)), The slanted cut-and-raised portion 6a of the rotation side member 6 abuts on the highest step 9f serving as a stopper of the guide 9 and stops rotating.

(Second Embodiment)
FIGS. 16-19 shows the armrest apparatus in 2nd Embodiment of this invention, FIG. 16 is sectional drawing of the locking mechanism of an armrest apparatus, and is equivalent to CC sectional view taken on the line of FIG. FIG. 17 corresponds to a cross-sectional view taken along the line DD of FIG. 18 is a cross-sectional view taken along the arrow H in FIG. 17, and FIG. 19 is a cross-sectional view taken along the arrow I in FIG.

  In this embodiment, as shown in FIG. 16, the disk portion of the rotation side member 6 is axially symmetric by 90 ° on the first and second circumferences C1 and C2 of two concentric circles having different diameters. The two diagonally raised parts 6a, 6b arranged in the above are formed toward the fixed side member 7 side.

  As shown in FIG. 17, the guide 9 guides the slide piece 11 and the guide groove 9 b for guiding the slide piece 10 correspondingly on the first and second circumferences C <b> 1 and C <b> 2 of two concentric circles. Two guide grooves 9c are formed symmetrically with respect to each other by 90 °. Thus, in this embodiment, in addition to the oblique cut and raised 6a of the rotation-side member 6 and the guide groove 9b of the guide 9 on the first circumference C1 of the first embodiment, a concentric second circle on the inner side thereof. On the circumference C2, the diagonally raised portions 6b of the rotation side member 6 and the guide grooves 9c of the guide 9 are additionally formed symmetrically with an offset of 90 °. The oblique cut and raised 6b and the guide groove 9c perform the same relative operations as the oblique cut and raised 6a and the guide groove 9b.

  The guide grooves 9b and 9c are located on the positions corresponding to the diagonally raised parts 6a and 6b, that is, on the first and second circumferences C1 and C2, respectively, and as shown in FIGS. 11 are formed in an inverted T-shaped cross section that loosely fits so that 11 does not come off. In addition, as shown in FIG. 17, the guide grooves 9b and 9c are such that the sliding pieces 10 and 11 are angles corresponding to predetermined angles in the directions of the first and second circumferences C1 and C2, respectively, for example, the rotation angle of the armrest body 3 is 45 °. It is formed in a range that can only move. The diagonally raised parts 6b are also engaging protrusions that slide or engage with the guide 9 or the sliding piece 11 having the guide groove 9c. For this reason, the radial width of the diagonally raised portion 6b is set larger than the radial width of the guide groove 9c or the sliding piece 11 as in the first embodiment.

  As shown in FIGS. 17 to 19, the guide 9 has three steps of heights of the lowest step 9 d, the middle step 9 e, and the highest step 9 f in a concentric arc along the first and second circumferences C 1 and C 2. Are each formed in a step shape. This is the same as in the first embodiment. That is, the height of the intermediate step portion 9e is determined by moving the stationary side member 7 along the hexagonal column portion 5e of the support shaft 5 when the rotation side member 6 is obliquely raised and raised 6a, 6b on the intermediate step portion 9e. The height is set high enough to release the engagement of the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7. The height of the lowest step portion 9d is set to a height that does not interfere with the diagonally raised portions 6a and 6b when the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7 are engaged. The maximum step portion 9f is set to a height that serves as a stopper that stops the movement (rotation) of the rotation-side member when the diagonally raised portions 6a and 6b of the rotation-side member 6 come into contact with each other.

  The sliding pieces 10 and 11 are slidable in the guide grooves 9b and 9c, respectively. As shown in FIG. 17 or FIG. 9, the respective end portions (for example, the distal end portion in the clockwise direction in FIG. 17) are provided. Further, the convex portions 10a and 11a are formed on the upper surfaces 10e and 11e (11e is not shown) on the obliquely raised parts 6a and 6b side of the rotation side member 6, respectively. The convex portions 10a and 11a are obliquely cut and raised so that the front and rear sides thereof are inclined so that the 6a and 6b can easily get on, and the top is formed in a circular shape, for example, in a smooth manner. Also in this embodiment, it is desirable that the anti-sliding surfaces 10 e and 11 e of the sliding pieces 10 and 11 are formed at the same height as the intermediate step portion 9 e of the guide 9. The diagonally cut and raised 6b and the sliding piece 11 operate in exactly the same manner as the diagonally raised and raised 6a and the sliding piece 10.

  When the armrest body 3 makes a large rotation in the range exceeding 90 °, the fixed side member 7 is formed in the above-described structure at a plurality of positions in axial contrast via the diagonally raised portions 6a or 6b of the rotation side member 6. Since it can be supported along (at least two places) and moved along the hexagonal column 5e of the support shaft 5, there is no galling with the hexagonal column 5e due to the tilting of the fixed side member 7, and it is smooth and stable. Operation can be ensured. On the other hand, when the rotation range of the armrest body 3 is 90 ° or less, the sliding piece 10 or the sliding piece 11 is formed in a range in which the sliding piece 10 or the sliding piece 11 can move at an angle smaller than 45 ° in the circumferential C1 or C2 direction. Three sliding pieces 11 can be provided on the same circumference C1 or C2, respectively. As a result, the reliability of smooth and stable operation can be further improved. In the first embodiment, the elastic member 8 is a coil spring, but another compression spring such as a leaf spring or a disc spring or an elastic member having an elastic action such as rubber can be used.

(Third embodiment)
20 to 25 show a third embodiment of the present invention. In this embodiment, the armrest apparatus 1 is applied to the toilet 20, and FIG. 20 shows a side view of the third embodiment. In this embodiment, the armrest body 4 is used at a substantially horizontal position pulled up from a storage position indicated by a chain line inverted downward.

  If the structure of the first embodiment and the second embodiment is attached to the toilet 20 as they are, a range from a substantially horizontal position to a predetermined angle, for example, a 45 ° position, is not locked and cannot be used. In addition, it is possible to move the range that is not locked as in the first and second embodiments above the substantially horizontal position and set the entire range from the substantially horizontal position to the storage position as the lock range. When it is pulled up to the horizontal position, the engagement noises of the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7 are made over the entire region, thereby impairing the quietness in the room.

  From the above, in this embodiment, when the armrest body 3 is pulled up from a lower storage position to a predetermined angle, for example, 45 °, the lock teeth 6g and 7g of the rotating side member 6 and the fixed side member 7 do not mesh. In addition, a rotation range from a predetermined angle, for example, 45 ° to a substantially horizontal use position is set as an angle adjustable range by ratchet rotation similar to the above-described embodiment.

  Armrest body 3 and lock mechanism 4 (support shaft 5, rotating side member 6, fixed side member 7, compression spring 8, guide 9, sliding piece 10, 11, fixed plate 12, washer 13 and nut 14) in this embodiment Is structurally the same as in the first and second embodiments. In this embodiment, members having the same function are denoted by the same reference numerals even if their shapes (particularly dimensions such as circumferential length) are partially different from those of the first and second embodiments. I correspond.

  21 to 25 show the operation of this embodiment. In each figure, (a) is a developed view of the operation corresponding to FIG. 9, and (b) corresponds to FIG. 20 showing the operation in (a). It is a schematic diagram.

  FIG. 21 shows a state in which the armrest body 3 is pulled up to 45 degrees clockwise from the storage position of FIG. In this state, the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7 are engaged with each other, and the oblique cutting and raising 6a of the rotation side member 6 is slightly lifted from the lowest step portion 9d of the guide 9. It is in.

  FIG. 22 shows a state where the armrest body 3 is further lifted 45 ° or more in the clockwise direction from the state of FIG. When the armrest body 3 is rotated in the clockwise direction, as shown in FIG. 22A, the fixed member 7 moves upward in the figure as the lock teeth 7g get over the lock teeth 6g of the rotation side member 6 (FIGS. 4 and The rotary member 6 rotates in the L direction while moving (along the hexagonal column portion 5e of the support shaft 5 in Fig. 8), but at this time, the diagonally raised portion 6a extends over the convex portion 10a of the sliding piece 10. Does not move but rotates together with the sliding piece 10 in the right direction (clockwise direction in FIG. 20).

  At this stage, when the armrest body 3 is released and stopped or rotated counterclockwise, the stationary member 7 is pushed back toward the rotating member 6 by the biasing force of the elastic member 8 and is again rotated. And the lock teeth 6g and 7g of the stationary member 7 are engaged with each other, and the counterclockwise rotation is locked.

  The slide piece 10 rotates while repeating the movements shown in FIGS. 21 and 22 up to a substantially horizontal position where the right end face 10b of the sliding piece 10 abuts against the end face 9g of the guide 9. Since the sliding piece 10 is in a free state in the guide groove 9b, the sliding piece 10 is moved away to the position where the right end face 10b of the swinging piece 10 abuts against the end face 9g of the guide 9 away from the diagonally raised part 6a. However, regardless of the position of the sliding piece 10, the rotation side member 6 can move in the same manner as in FIG.

  FIG. 23 shows a state in which the armrest body 3 is once lifted slightly by a slight angle and unlocked before starting to be pulled counterclockwise again from the substantially horizontal use state. When the armrest body 3 is pulled upward by a small angle from a substantially horizontal state of use, the sliding piece 10 does not move in a state where it abuts against the end surface 9g of the guide 9, so that the diagonally raised portion 6a is a convex portion of the sliding piece 10. Move over 10a. In this position, the diagonally raised portion 6a rides on the upper surface 10e of the sliding piece 10 having the same height as the intermediate step 9e of the guide 9, so that the lock teeth 6g and 7g of the rotating side member 6 and the fixed side member 7 are completely As a result, the armrest body 3 is unlocked.

  FIG. 24 shows a state where the armrest is pulled down to an angle of 45 ° counterclockwise from the unlocked state of FIG. Once the unlocked state shown in FIG. 23 is reached and the armrest body 3 is rotated counterclockwise and pulled down, the diagonally raised portion 6a of the rotating side member 6 slides as shown in FIG. 24 (a). While riding on the upper surface 10 e of the piece 10, the sliding piece 10 is dragged and moved in the left direction (M direction). When the armrest body 3 reaches a position of 45 °, the end face 10 c on the left end side of the sliding piece 10 abuts against the end face 9 h of the guide 9.

  FIG. 25 shows a state where the armrest body 3 is further lowered (inverted) by 45 ° or more in the counterclockwise direction from the state of FIG. When the armrest body 3 is further rotated counterclockwise (M direction) from the 45 ° position in FIG. 24, the sliding piece 10 does not move in a state where it abuts against the end surface 9 h of the guide 9. 6a climbs over the convex part 10a of the sliding piece 10, rides on the intermediate step part 9e of the guide 9, and the armrests in the unlocked state in which the lock teeth 6g, 7g of the rotating side member 6 and the fixed side member 7 are completely separated. The main body 3 continues to rotate counterclockwise. In this unlocked state, the armrest body 3 can be freely lowered (inverted) to the storage position, and can be freely returned to the substantially horizontal position (use position) (raised).

  When the armrest body 3 is rotated leftward in FIG. 25 (counterclockwise direction) or rightward in FIG. 23 (clockwise direction), the diagonally raised part 6a of the rotation side member 6 becomes the highest stopper for the guide 9. Since it hits the step 9f, it stops rotating.

  Also in this embodiment, the diagonally cut and raised 6b and the sliding piece 11 may be provided similarly to the second embodiment, and these diagonally raised and raised 6b and the sliding piece 11 are provided with the diagonally raised and raised 6a and the sliding piece. The same operation as the moving piece 10 is performed.

(Fourth embodiment)
This embodiment is completely the same as the first to third embodiments except that the structure of a part of the sliding piece 10 or the sliding piece 11 and the guide 9 is changed. That is, for the first embodiment, the protrusion 10 a of the sliding piece 10 is eliminated, the upper surface 10 e is flattened, and the sub-biasing member 15 such as a coil spring is inserted between the sliding piece 10 and the guide 9. At the same time, the upper surface 10e of the sliding piece 10 is slightly lower than the intermediate step portion 9e of the guide 9, and other configurations are the same as those of the first embodiment except for these changes.

  26 to 28 show the operation of this embodiment, in which (a) is a developed view of the operation and (b) is a schematic diagram of the armrest device. FIG. 21A shows a use state (corresponding to FIG. 1) in which the armrest body 3 of this embodiment is pulled down to a substantially horizontal use position. In this embodiment, one end of a compression coil spring as the sub biasing member 15 is fixed to the right end surface 10 b of the sliding piece 10, and the other end is fixed in a groove 9 i provided on the end surface 9 g side of the guide 9. Or it is accommodated in a free state. On the other hand, although not shown, one end of the tension spring is fixed to the left end surface 10c of the sliding piece 10 as the sub urging member 15, and the other end is fixed in a groove provided on the wall 9h side of the guide 9. You may be made to do. In either case, the urging member 15 is attached in a state where the urging member 15 is always urged in the direction in which the sliding piece 10 is pressed against the wall 9 h of the guide 9.

  In the state of FIG. 26, the lock teeth 6 g and 7 g of the rotation side members 6 and 7 are engaged with each other (corresponding to FIG. 3), and the oblique cut and raised 6 a of the rotation side member 6 is the lowest step portion 9 d of the guide 9. It is in a slightly raised position.

  FIG. 27 shows a state in which the armrest is pulled up (stands up) to around 45 ° in the clockwise direction from the state of FIG. When the armrest body 3 is rotated in the clockwise direction, the lock teeth 7g of the fixed side member 7 get over the lock teeth 6g of the rotary side member 6, so that the fixed side member 7 resists the urging force of the elastic member 8 and moves away. The rotation side member 6 rotates in the L direction. At this time, the diagonally cut and raised 6a does not move up to the amount that rides on the upper surface 10e of the sliding piece 10, but moves to the right (L direction) with the sliding piece 10 against the biasing force of the sub biasing member 15. That is, it rotates clockwise. Then, the right end surface 10 b of the sliding piece 10 abuts against the end surface 9 g of the guide 9 at a predetermined angle of the armrest body 3, for example, 45 °.

  Further, when the armrest body 3 is rotated in a clockwise direction from a predetermined angle, for example, 45 °, the sliding piece 10 does not move in a state where it abuts against the end surface 9g of the guide 9, so It gets over the upper surface 10e and rides on the intermediate step 9e of the guide 9 that is slightly higher than the upper surface 10e. At this time, the lock teeth 6g and 7g of the rotation side member 6 and the fixed side member 7 are completely separated from each other, and the armrest body 3 is unlocked to be in a rotation free state.

  Also in this embodiment, the rotation range from the use state of the substantially horizontal armrest body 3 in FIG. 26 to the predetermined angle is an angle adjustable range by ratchet rotation similar to the first embodiment.

  FIG. 28 shows a reset state in which the sliding piece 10 is pushed back to the initial position of FIG. In the operation of FIG. 27, the oblique cutting and raising 6a gets over the upper surface 10e of the sliding piece 10 and rides on the intermediate step portion 9e of the guide 9 slightly higher than the upper surface 10e. Since it is free from the raising 6a, it is pushed back until it comes into contact with the end surface 9g on the opposite side of the guide 9 by the biasing force of the sub biasing member 15.

  In the state of FIG. 28, the sliding piece 10 in contact with the wall 9g of the guide 9 and the intermediate step 9e of the guide 9 are continuously adjacent along the guide groove 9b. For this reason, since the oblique cut and raised 6a continuously rides on both the upper surface 10e of the sliding piece 10 and the intermediate step portion 9e of the guide 9, the armrest body 3 is unlocked from the position of FIG. Rotate (stand up) to the storage position in the state, return to the substantially horizontal position (lower), or return the armrest body 3 from the storage position to the substantially horizontal position in the unlocked state (down) It is also possible freely.

  The present invention is not limited to the embodiment shown in FIGS. 1 to 28, and various modifications can be made. For example, the overall rotation angle of the armrest body 3 and the angle adjustment range in the vicinity of the use position, the engagement protrusions (obliquely raised parts 6a and 6b), the guide grooves 9b and 9c or the sliding pieces 10 and 11 are arranged, quantity and shape. Alternatively, the material of the member including others can be arbitrarily changed. Moreover, as a member which has sliding parts, such as the guide 9, the sliding pieces 10 and 11, or the rotation side member 6, and the fixed side member 7, it is desirable to make one or both into a lubricous metal or a nonmetallic member.

  Further, the thin plate-like rotating side member 6 and the fixed side member 7 formed by processing or press molding and the guide 9 formed with the guide groove and the stepped portion are separate members, but the rotating side member 6 or the fixed side member 7 and the guide are formed. 9 can also be used as a unitary member. In this case, since the rotation side member and the fixed side member can be formed into a thin plate-like press-molded product in the embodiment, the entire armrest device has a simple and lightweight structure, and the processing cost can be reduced.

  As described above, according to the present invention, the fixed-side member and the rotation-side member, the plurality of concentric guide grooves and stepped portions provided with the lock teeth over the entire circumferences of the opposed portions, the slide sliding in the guide groove. By having a moving piece, a sliding piece, and an engaging projection that engages or slides on the stepped part, it rotates with a simple structure from a substantially horizontal use position to an upright or downward inverted storage position. It is possible to provide an armrest device that can be finely adjusted for each saw tooth in the lock teeth, and that the operation angle in the vicinity of the horizontal can be finely adjusted, the operation is quiet and smooth, and the safety and durability are excellent.

FIG. 3 is a side view of the automobile seat in a substantially horizontal use state in which the armrest body in the first embodiment of the present invention is pulled down from the storage position where the armrest body stands along the seat back. It is a partially broken side view of the armrest device of the present invention. It is a partially broken rear view of FIG. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is an expanded view in the FF line of FIG. FIG. 10 is a cross-sectional view taken along arrow G in FIG. 9. (A) is an expanded view explaining the operation | movement corresponding to FIG. 9 of the use condition of FIG. 1, (b) is a schematic diagram corresponding to FIG. 1 which shows the operation state of (a). FIG. 12A is a development view for explaining the operation in a state where the armrest is started to be pulled up (stand up) in the clockwise direction from the use state of FIG. 11, and FIG. 12B is a schematic diagram showing the operation state of FIG. (A) is a developed view for explaining the operation in a state in which the armrest is pulled up to 45 ° in the clockwise direction from the state of FIG. 12 (standing), and (b) is a schematic diagram showing the operation state of (a). . (A) is a developed view for explaining the operation in the unlocked state in which the armrest is pulled up 45 ° or more in the clockwise direction from the state of FIG. 13 (standing), and (b) is a schematic diagram showing the operating state of (a). is there. (A) is a development view for explaining the operation in a state where the armrest starts to be pulled down counterclockwise again from the unlocked state of FIG. 14, and (b) is a schematic diagram showing the operating state of (a). It is sectional drawing of the locking mechanism in the armrest apparatus of 2nd Embodiment of this invention, and is equivalent to the CC line cross section of FIG. It is sectional drawing of the locking mechanism in the armrest apparatus of 2nd Embodiment, and is equivalent to the DD sectional view of FIG. It is H arrow sectional drawing of FIG. FIG. 18 is a cross-sectional view taken along arrow I in FIG. 17. It is a side view which shows 3rd Embodiment which applied this invention to the toilet bowl. (A) is a developed view for explaining the same operation corresponding to FIG. 9 in a state where the armrest is pulled up to 45 ° clockwise from the storage position in FIG. 20, and (b) shows the operation state of (a). It is a schematic diagram corresponding to FIG. (A) is a development view for explaining the operation in a state where the armrest is further pulled 45 ° or more in the clockwise direction from the state of FIG. 21, and (b) is a schematic diagram showing the operation state of (a). 20A is a development view for explaining the operation in a state where the armrest is once lifted upward and unlocked when starting to be pulled up (lowered) counterclockwise again from the use state of FIG. 20, and FIG. It is a schematic diagram which shows. (A) is a development view for explaining the operation in a state in which the armrest is pulled down to 45 ° in the counterclockwise direction from the unlocked state in FIG. 23, and (b) is a schematic diagram showing the operating state in (a). (A) is a developed view for explaining the operation in a state in which the armrest is further lowered by 45 ° or more in the counterclockwise direction (inverted) from the state of FIG. 24, and (b) is a schematic diagram showing the operation state of (a). is there. (A) is a development view (corresponding to FIG. 9), explaining the operation of the armrest according to the fourth embodiment of the present invention in use (locked state in which the rotation side member and the fixed side member corresponding to FIG. 1 mesh). b) is a schematic diagram showing the operating state of (a). FIG. 27A is a developed view for explaining the operation in a state where the armrest is pulled up to 45 ° in the clockwise direction from the state of FIG. 26 (standing), and FIG. 27B is a schematic diagram showing the operation state of FIG. . 27A is a developed view for explaining the operation in a state in which the sliding piece is pushed back to the initial position of FIG. 26 by the compression spring at the time of the operation of FIG. 27, and FIG. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Armrest apparatus 2 Seat back 2a Seat side plate 3 Armrest main body 3a Inside arm 3b Outside arm 3c, 9a, 10a Convex part 4 Lock mechanism 5 Support shaft 6 Rotating side member 6a, 6b Engagement protrusion )
6g, 7g Lock teeth 6h, 7h Vertical surface 6i, 7i Slope 7 Fixed side member 8 Elastic member 9 Guide 9b, 9c Guide groove 9d Minimum step portion 9e Intermediate step portion 9f Maximum step portion 10, 11 Sliding piece 15 Sub bias Element

Claims (7)

A rotation-side member that is rotatably mounted around the support shaft of the support and supports the rotation of the armrest body;
A fixed side member attached to the support shaft so as to be movable in the axial direction in a state of being rotationally restrained while facing the rotation side member;
A serrated locking tooth formed so as to mesh with each other over the entire circumference of the opposing portion of the rotating side member and the fixed side member, and locking the armrest body at a predetermined angle;
An elastic member that urges the locking teeth of the rotating side member and the fixed side member to mesh with each other;
A plurality of guide grooves each having an arc shape with a predetermined length concentric with the support shaft, and a guide provided on either the rotation side member or the fixed side member;
A plurality of sliding pieces that slide in the guide groove as the rotating side member rotates;
A plurality of engaging projections provided on the other of the rotating side member or the fixed side member so as to engage with each sliding piece;
The guide is formed with a plurality of stepped portions having different heights, and the engagement protrusions abut on the stepped portions having different heights, whereby the fixed side member is reciprocated in the axial direction to move the lock teeth. The armrest device is characterized in that the engagement or the release thereof is performed.   The armrest device according to claim 1, further comprising a sub-urging member that urges the sliding piece so as to press the end face of the guide groove.   The stepped portion has three stages of low, middle and high, and the engaging step engages the lower stepped portion to engage the lock teeth, and the intermediate stepped portion releases the lock teeth from engagement. The armrest device according to claim 1, wherein the high step portion stops the rotation of the rotation side member.   The armrest device according to any one of claims 1 to 3, wherein the sliding piece has substantially the same height as the intermediate step portion.   The armrest device according to any one of claims 1 to 3, wherein the sliding piece has a lower height than the intermediate step.   At least two of the guide grooves are provided in an axially symmetric position on one or a plurality of circumferences that are concentric with the support shaft, and a plurality of the guide grooves are disposed so as to face the guide grooves. The armrest device according to claim 1, wherein:   The armrest device according to any one of claims 1 to 6, wherein the engagement protrusion is an oblique cut and raised by being obliquely raised toward the guide groove from the rotation side member or the fixed side member. .

Images