JP5128850B2 - Both-side reclining mechanism and assembly method of both-side reclining mechanism - Google Patents

Description

  The present invention provides a first reclining unit that is provided on one side of the seat and locks / unlocks the tilt of the seat back relative to the seat cushion, and is provided along the tilt center axis of the seat back, the first reclining unit The first operation shaft that unlocks the first reclining unit by rotating the shaft in one direction around the axis, and the tilt of the seat back with respect to the seat cushion provided on the other side of the seat A second reclining unit that locks / unlocks the second reclining unit, and a second reclining unit that is provided along a tilting central axis of the seat back, and is inserted through the second reclining unit and rotated in one direction about the axis as the central axis. The second operating shaft that makes the reclining unit unlocked An operating means provided on the first operating shaft for rotating the first operating shaft in one direction, the first operating shaft, and the second operating shaft connected to each other to rotate the first operating shaft; The present invention relates to a both-side reclining mechanism and a method for assembling the same.

  As shown in FIG. 14, the conventional both-side reclining mechanism is assembled by attaching the first reclining unit 53 and the second reclining unit 53 ′ to the outer side and inner side lower arm bodies 51 and 51 ′, and further, the first reclining unit. 53, the outer side and inner side upper arms 55 and 55 'are attached to the second reclining unit 53'. The outer upper arm 55 and the inner upper arm 55 'are integrated using other members to constitute a seat back frame.

  The first reclining unit 53 is provided along the tilting central axis of the seat back, and the first reclining unit 53 is unlocked by inserting the first reclining unit 53 and rotating it in one direction around the axis. A first operating shaft 57 to be in a state is provided. Similarly, the second reclining unit 53 ′ is also provided along the tilting central axis of the seat back, inserted through the second reclining unit 53 ′, and rotated in one direction about the axis as the second reclining unit. A second operation shaft 57 ′ is provided to bring the unit 53 ′ into an unlocked state.

  The first operation shaft 57 is formed with a collar portion 57 b that abuts on the outer surface of the first reclining unit 53 outside the seat via an operation handle 63 that rotates integrally with the first operation shaft 57. Similarly, the second operation shaft 57 ′ is also formed with a flange portion 57 b ′ that contacts the outer surface of the second reclining unit 53 ′ on the outer side of the seat.

  The first operation shaft 57 is attached with a push nut 61 that contacts the outer surface of the first reclining unit 53 on the inner side of the seat, and the first operation shaft 57 is prohibited from moving in the axial direction. Similarly, a push nut 61 ′ that contacts the outer surface of the second reclining unit 53 ′ is also attached to the second operation shaft 57 ′, and movement of the first operation shaft 57 ′ in the axial direction is prohibited. .

  The transmission shaft 59 is fixed to the first operation shaft 57 and the second operation shaft 57 ′ by a technique such as welding, and the rotation of the first operation shaft 57 is performed via the transmission shaft 59. 57 'is transmitted.

  In recent years, as shown in FIG. 15, the upper arm 55, the first reclining unit 53, the first operation shaft 57, the upper arm 55 ′, the sub-lower arm 65, the second reclining unit 53 ′, and the second operation shaft 57. ', An operation handle 63, a seat back assembly 67 comprising a transmission shaft 59 and a sub-lower arm 65' is assembled first, and the seat back assembly 67 is attached to the seat cushion lower arm bodies 69, 69 'already assembled. It is made to install.

In such a case, there is a concern that a dimensional error may occur between the actual dimension in the width direction of the lower arm body 69 and the lower arm body 69 'and the actual dimension in the width direction of the seat back assembly 67.
Here, when the seat back assembly 67 is attached to the lower arm main bodies 69 and 69 ′, the first operation shaft 57 and the second operation shaft 57 ′ are prohibited from moving in the axial direction. There is a problem that an axial load is applied to the transmission shaft 59 and the second operation shaft 57 ′, and the operation feeling during the reclining operation is deteriorated.

On the other hand, in the double-side reclining mechanism described in Patent Document 1, the positions of the first operation shaft, the second operation shaft, and the transmission member can be adjusted in the axial direction. Therefore, by setting the first operation shaft and the second operation shaft wider in advance, the integrated first operation shaft, second operation shaft, and transmission member can be moved in the axial direction. Therefore, by using the both-side reclining mechanism described in Patent Document 1, it is possible to absorb the dimensional error between the seat back assembly and the lower arm body, and the axial direction of the first operation shaft, the second operation shaft, and the transmission member It is possible to avoid the load of.
Japanese Patent Laying-Open No. 2003-189962 (FIG. 1)

  However, when the double-side reclining mechanism described in Patent Document 1 is used, the integrated first operation shaft, second operation shaft, and transmission member are movable in the axial direction. That is, when the first operating shaft is operated and rotated, the first operating shaft is movable in the axial direction, and thus there is a problem that the operation feeling is poor.

  This invention is made | formed in view of the said problem, The subject is providing the both-sides reclining mechanism with good operation feeling, and its assembly method.

The invention according to claim 1 is provided on one side of the seat, and is provided along a first reclining unit that locks / unlocks the tilt of the seat back with respect to the seat cushion, and the tilt center axis of the seat back, A first operating shaft that is inserted into the first reclining unit and rotated in one direction about the axis as a central axis to bring the first reclining unit into an unlocked state, and provided on the other side of the seat, A second reclining unit that locks / unlocks the tilt of the seat back; and a second reclining unit that is provided along the tilt central axis of the seat back, is inserted through the second reclining unit, and is rotated in one direction about the axis as a central axis. To bring the second reclining unit into an unlocked state. An operating shaft, an operating means provided on the first operating shaft and rotating the first operating shaft in one direction, the first operating shaft, and the second operating shaft are connected, and the first operating shaft is connected. And a transmission member that transmits rotation of the shaft to the second operation shaft. The first operation shaft is fixed to one end of the transmission member and is pivoted with respect to the first reclining unit. The second operation shaft is fixed to the other end of the transmission member so as to allow relative movement in the axial direction with respect to the second reclining unit, and is elastic in the axial direction of the second operation shaft. deformable, providing the resilient means for positioning said second recliner unit in the axial direction with respect to the second operating shaft It is both sides reclining mechanism, characterized.

  When the operating means is operated, the first operating shaft rotates in one direction, and the first reclining unit is unlocked. The rotation of the first operation shaft is transmitted to the second operation shaft via the transmission member, the second operation shaft rotates in one direction, and the second reclining unit is also unlocked.

“Fixed” includes, but is not limited to, welding, adhesion, and pressure welding .

According to a second aspect of the present invention, the second operating shaft has a first collar portion capable of contacting a surface facing the seat of the second reclining unit, and a surface opposite to the surface facing the seat of the second reclining unit. A second collar portion capable of abutting on a side surface, and the elastic means includes a surface facing the seat of the second reclining unit and a first elastic body abutting on the first collar portion, in the sheet surface facing the second recliner unit and the opposite side surface, the two side reclining mechanism according to claim 1, wherein the second elastic member abutting the second flange portion, characterized in that it consists is there.

According to a third aspect of the present invention, in the elastic means, an intermediate portion is wound around the second operation shaft in the axial direction, one end is locked to the second operation shaft, and the other end is There is a both side reclining mechanism according to claim 1, characterized in that the coil spring is engaged with the sheet side.

The invention according to claim 4 is provided on one side of the seat, provided along a first reclining unit that locks / unlocks the tilt of the seat back relative to the seat cushion, and the tilt center axis of the seat back, A first operating shaft that is inserted into the first reclining unit and rotated in one direction about the axis as a central axis to bring the first reclining unit into an unlocked state, and provided on the other side of the seat, A second reclining unit that locks / unlocks the tilt of the seat back; and a second reclining unit that is provided along the tilt central axis of the seat back, is inserted through the second reclining unit, and is rotated in one direction about the axis as a central axis. To bring the second reclining unit into an unlocked state. An operating shaft, an operating means provided on the first operating shaft and rotating the first operating shaft in one direction, the first operating shaft, and the second operating shaft are connected, and the first operating shaft is connected. In a method of assembling a double-side reclining mechanism having a transmission member for transmitting the rotation of the shaft to the second operation shaft, a lower arm located on the side of the seat cushion frame is provided as a lower arm body, and a sub-lower arm attached to the lower arm body. The first operation shaft is prohibited from axial movement with respect to the first reclining unit, the second operation shaft is allowed to move axially relative to the second reclining unit, and the seat back Attach the first reclining unit to the upper arm on one side of the frame The second reclining unit is attached to the upper arm on the other side of the seat back frame, the sub-lower arm on one side of the seat cushion side is attached to the first reclining unit, and the other side of the seat cushion side is attached to the second reclining unit. After assembling the seat back assembly by attaching the first lower operating shaft to one end of the transmission member and fixing the second operation shaft to the other end of the transmission member. It attaches to the said lower arm main body fixed to the floor side, It is the assembly | attaching method of the both-side reclining mechanism characterized by the above-mentioned.

According to the first to third aspects of the invention, the first operating shaft of the first reclining unit provided with the operating means is prohibited from moving in the axial direction with respect to the first reclining unit. Is good.

  The first operation shaft is fixed to one end of the transmission member, and is not allowed to move in the axial direction with respect to the first reclining unit. The second operation shaft is an axis with respect to the second reclining unit. By being fixed to the other end of the transmission member so as to allow relative movement in the direction, even if the both-side reclining mechanism is assembled to the seat, the integrated first operation shaft, transmission member, and second operation shaft Has no axial load and is easy to operate.

  Furthermore, since the transmission member is fixed to the first operation shaft and the second operation shaft, the play in the circumferential direction at the connection portion between the first operation shaft and the transmission member, and at the connection portion between the transmission member and the second operation shaft. There is no. Therefore, in these portions, a synchronization delay between the first reclining unit and the second reclining unit does not occur.

Elastically deformable in the axial direction before Symbol second operating shaft, by providing resilient means for positioning said second recliner unit in the axial direction with respect to the second operating shaft, it is assembled on both sides reclining mechanism It becomes easy.

According to the second aspect of the present invention, the second operating shaft has a first collar portion that can contact a surface facing the seat of the second reclining unit, and a surface facing the seat of the second reclining unit. A second collar portion capable of abutting against a surface opposite to the first surface, wherein the elastic means is a first elastic body that abuts against the surface facing the seat of the second reclining unit and the first collar portion. And a second elastic body that abuts against the surface opposite to the surface facing the seat of the second reclining unit and the second collar portion, the assembly of the both-side reclining mechanism is facilitated. .

According to a third aspect of the present invention, the elastic means has an intermediate portion wound around the second operation shaft in the axial direction, one end locked to the second operation shaft, and the other Since the end portion is a coil spring locked to the seat side, the assembly of the both-side reclining mechanism is facilitated. According to the invention according to claim 4 , the first operation shaft of the seat back assembly includes the first operation shaft. While being fixed to one end of the transmission member, axial movement relative to the first reclining unit is prohibited, and the second operating shaft is allowed to move relative to the second reclining unit in the axial direction. Since it is fixed to the other end of the transmission member, the operation feeling is good.

  The first operation shaft is fixed to one end of the transmission member, and is not allowed to move in the axial direction with respect to the first reclining unit. The second operation shaft is an axis with respect to the second reclining unit. By fixing to the other end of the transmission member so as to allow relative movement in the direction, when the seat back assembly is attached to the lower arm body of the seat cushion, the size in the width direction of the seat back assembly and the seat Even if there is an error in the dimension between the lower arm main bodies of the cushion, the integrated first operation shaft, transmission member, and second operation shaft are not subjected to an axial load, and the operability is good.

  Furthermore, since the transmission member is fixed to the first operation shaft and the second operation shaft, the play in the circumferential direction at the connection portion between the first operation shaft and the transmission member, and at the connection portion between the transmission member and the second operation shaft. There is no. Therefore, in these portions, a synchronization delay between the first reclining unit and the second reclining unit does not occur.

<First embodiment>
First, as shown in FIG. 11, the seat 1 of this embodiment includes a seat cushion 3 that supports a seated person's buttocks and a seat back 5 that supports the seated person's back. The first and second reclining units 90 and 90 ′ having the same structure are provided on both sides of the seat 1.

  Further, as shown in FIG. 1, the lower arm 200 positioned on the side of the seat cushion frame of the seat cushion 3 of the seat 1 of the present embodiment includes a lower arm main body 199 and a sub-lower arm 201 attached to the lower arm main body 199. It has become.

  As shown in FIG. 5, the base plate 100 is attached to the sub-lower arm 201, and the ratchet plate 130 is attached to the upper arm 202 on one side of the seat back frame of the seat back 5.

  Here, the first reclining unit 90 and the second reclining unit 90 'will be described. In addition, since the structure of the 1st reclining unit 90 and the 2nd reclining unit 90 'is the same, it demonstrates with the 1st reclining unit 90. FIG.

  As shown in FIGS. 4 to 7, the disc-shaped ratchet plate 130 is fitted to the disc-shaped base plate 100, so that the two are overlapped so as to be relatively rotatable. The reclining unit 90 is completed by providing an adjusting mechanism for locking / unlocking the relative rotation between the base plate 100 and the ratchet plate 130 between the base plate 100 and the ratchet plate 130.

  The cylindrical mounting bracket 205 wraps the base plate 100 and the ratchet plate 130 from the outside, and prohibits the ratchet plate 130 from separating from the base plate 100. Specifically, one end of the mounting bracket 205 is locked to the outer peripheral portion of the base plate 100, and the ratchet plate holding portion 205a on the other end side presses the ratchet plate 130 from the rotation center axis direction.

  A hole 101 and a hole 131 are formed at positions on the rotation center axis of the base plate 100 and the ratchet plate 130, and a first operation shaft 120 as a shaft is inserted into the hole 101 and the hole 131. As shown in FIGS. 5 and 7, a circular recess 132 centered on the first operation shaft 120 is formed on the surface of the ratchet plate 130 facing the base plate 100, and the inner peripheral wall surface of the recess 132 is formed. The inner teeth 133 are engraved.

  As shown in FIGS. 5 and 7, a concave portion 104 is also formed on the surface of the base plate 100 facing the concave portion 132 of the ratchet plate 130. As shown in FIG. A pair of guide projections 105, 106 and a pair of guide projections 107, 108 project toward the plate 130.

  On the surface of the base plate 100 opposite to the ratchet plate 130 side (the outer surface of the base plate 100), a plurality of protrusions 100a are equidistantly arranged on the same circumference around the hole 101 (coaxial with the rotation center axis O). It is arranged. A plurality of protrusions 130 a are also arranged at equal intervals on the same circumference around the hole 131 on the surface of the ratchet plate 130 opposite to the base plate 100 (the outer surface of the ratchet plate 130).

  The pole 140 has external teeth 141 that can be engaged and disengaged from the radial direction of the tip circle on the inner teeth 133 of the ratchet plate 130 on the front end surface side, and as shown in FIG. 8, the guide surfaces of the guide protrusions 105 and 106 105a and 106a are slidably guided in the direction orthogonal to the rotation center axis of the ratchet plate 130, that is, in the radial direction of the tip circle of the internal teeth 133.

  The pole 150 has the same shape as the pole 140, is sandwiched between the guide surfaces 107a and 108a of the guide protrusions 107 and 108, is slidably guided in the radial direction of the tip circle of the inner tooth 133, and is on the front end surface side. The outer teeth 151 can be engaged with the inner teeth 133 of the ratchet plate 130.

  In the space on the rear end surfaces 146 and 156 side of the poles 140 and 150, a cam 170 that can rotate together with the first operation shaft 120 is disposed. That is, as shown in FIG. 5, a cross-sectional oval portion 123 is formed in the middle portion of the first operation shaft 120, and this cross-sectional oval portion 123 is fitted in the oval hole 171 of the cam 170. Yes. As a result, the first operation shaft 120 and the cam 170 are fitted in a state where relative rotation is impossible, and the cam 170 rotates together with the first operation shaft 120.

  The poles 140 and 150 and the cam 170 are formed to have the same thickness and are disposed on the same plane of the base plate 100. The cam 170 has an inclined cam surface 174b for pressing the rear end surfaces 146 and 156 of the poles 140 and 150 when the cam 170 rotates to mesh the outer teeth 141 and 151 of the poles 140 and 150 with the inner teeth 133 of the ratchet plate 130. , 175b.

  Cam grooves 144 and 154 are formed on the surface of the poles 140 and 150 on the ratchet plate 130 side (in this embodiment, the cam grooves 144 and 154 are holes penetrating to the surface on the base plate 100 side). . The release plate 180 constituting the release means is arranged so that one surface thereof overlaps with the poles 140 and 150 and the cam 170 and the other surface is in sliding contact with the ratchet plate 130. A hole 181 through which the first operation shaft 120 is inserted is formed in the central portion of the release plate 180.

  As shown in FIGS. 8 and 9, the cam 170 has protrusions 176 and 177 protruding toward the ratchet plate 130, and these protrusions 176 and 177 are formed at the edge of the hole 181 of the release plate 180. It is fitted in small slots 182 and 183 extending in the radial direction. For this reason, the cam 170 and the release plate 180 rotate in conjunction with each other.

  Further, as shown in FIGS. 5 and 8, projections 183 and 184 that engage with the cam grooves 144 and 154 are formed on the rotating end portion of the release plate 180 by press molding or the like. The cam grooves 144 and 154 are shaped so that when the release plate 180 rotates in the clockwise direction in FIG. 8, the pawls 140 and 150 are moved toward the rotation center side of the cam 170 by the interaction between the cam grooves 144 and 154 and the protrusions 183 and 184. It is set to move forcibly.

  As shown in FIGS. 8 and 9, spiral springs 191 and 195 as urging means have inner ends hooked to hooks 111 and 112 of the base plate 100 and outer ends hooked to step portions 178 and 179 of the cam 170. The cam 170 is rotated and biased so that the cam 170 pushes the rear end surfaces 146 and 156 of the poles 140 and 150.

  The operation of the reclining unit 90 configured as described above will be described. In the locked state, the urging force of the spiral springs 191 and 195 causes the cam 170 to push the rear end surfaces 146 and 156 of the poles 140 and 150, and the external teeth 141 and 151 of the poles 140 and 150 mesh with the internal teeth 133 of the ratchet plate 130. In this state, the rotation of the ratchet plate (seat back) 130 is prohibited.

  The movement at the time of shifting to the locked state will be described. The cam 170 that receives the urging force of the spiral springs 191 and 195 is a direction in which the external teeth 141 and 151 of the poles 140 and 150 are engaged with the internal teeth 133 of the ratchet plate 130. Rotate first. Accordingly, the inclined cam surfaces 174b and 175b of the cam 170 press the rear end surfaces 146 and 156 of the poles 140 and 150, and the outer teeth 141 and 151 of the poles 140 and 150 mesh with the inner teeth 133 of the ratchet plate 130. Move in the radial direction.

  When the first operating shaft 120 is rotated clockwise in FIG. 9 against the biasing force of the spiral springs 191 and 195 in the locked state, and the cam 170 is also rotated clockwise, the poles 140 and 150 of the cam 170 are rotated. The pressure on the rear end surfaces 146 and 156 is released, and the projections 183 and 184 of the release plate 180 are in sliding contact with the inclined wall surfaces of the cam grooves 144 and 154 of the poles 140 and 150, and the external teeth 141 and 151 of the poles 140 and 150 are Pole 140 and pole 150 retreat in the direction away from the inner teeth 133 of the ratchet plate 130, the meshing between the outer teeth 141 and 151 of the poles 140 and 150 and the inner teeth 133 of the ratchet plate 130 is released, and the ratchet plate (seat The back 130 can be tilted (unlocked state).

  When the seat back is tilted to a desired angle and the operating force on the first operating shaft 120 is released, the cam 170 pushes the rear end surfaces 146 and 156 of the poles 140 and 150 by the urging force of the spiral springs 191 and 195, The external teeth 141 and 151 of 140 and 150 mesh with the internal teeth 133 of the ratchet plate 130 again to return to a state where the rotation of the ratchet plate (seat back) 130 is prohibited.

  Next, the sheet 1 of this embodiment will be described with reference to FIGS. 1, 2, 10, and 11. As shown in FIG. 11, the configuration of one side of the seat 1 and the configuration of the other side of the seat 1 are substantially the same. The description which overlaps is abbreviate | omitted.

  As shown in FIGS. 1 and 10, an operation handle 353 as an operation unit is fixed to the first operation shaft 120 of the first reclining unit 90. The rotation of the operation shaft 120 of the first reclining unit 90 is performed via a transmission shaft 351 as a transmission member in which the other end side is fixed to the operation shaft 120 ′ and one end side is fixed to the operation shaft 120. The second operation shaft 120 ′ of the second reclining unit 90 ′ is transmitted. Examples of fixing include, but are not limited to, welding, adhesion, and pressure welding.

  As shown in FIGS. 2 and 10, holes 201 a and 202 a through which the operation shaft 120 is inserted are formed in the sub-lower arm 201 and the upper arm 202. As shown in FIG. 3, a first spring locking portion 300 is formed on the upper arm 202.

  As shown in FIGS. 2 and 10, a semi-cylindrical second spring locking portion 301 centering on the axis of the operation shaft 120 is formed around the hole 201 a of the sub-lower arm 201. The second spring locking portion 301 has a surface 301 a along a straight line parallel to the rotation center axis (the axis of the shaft 120) of the seat back 5. The surface 301a is formed with a first recess 301c that is recessed in one direction on the circumference around the rotation center axis of the seat back 5 and whose bottom surface is the first locking surface 301b. Further, the first locking surface (bottom surface) 301b of the first recess 301c is recessed in one direction on the circumference around the rotation center axis of the seat back 5, and the bottom surface is the second locking surface 301d. A certain second recess 301e is formed.

  The inner end portion of the first spiral spring 311 is engaged with the first engagement surface 301 b of the second spring engagement portion 301, and the outer end portion is engaged with the first spring engagement portion 300 of the upper arm (seat back 5) 202. It has been stopped. The seat back (upper arm 202) 5 is urged in the forward tilt direction by the urging force of the first spiral spring 311.

  Further, the inner end portion of the second spiral spring 321 is locked to the slit portion 120 a formed at the end portion of the operation shaft 120 as a transmission member, and the outer end portion is the second locking portion of the second spring locking portion 301. Locked to the surface 301d. The backlash between the operation shaft 120 and the cam 170 of the first reclining unit 90 and the backlash between the operation shaft 120 ′ and the cam 170 ′ of the second reclining unit 90 ′ are absorbed by the biasing force of the second spiral spring 321. ing.

  As shown in FIGS. 1, 5, and 10, the first operation shaft 120 of the first reclining unit 90 has a collar portion that contacts the outer surface of the base plate 100 of the first reclining unit 90 via the operation handle 353. 120b is formed.

  Similarly, the second operation shaft 120 ′ of the second reclining unit 90 ′ is also formed with a flange portion 120 b ′ that contacts the outer surface of the base plate 100 ′ of the second reclining unit 90 ′.

  The first operation shaft 120 of the first reclining unit 90 is provided with a push nut 121 that contacts the outer surface of the ratchet plate 130 of the first reclining unit 90. Therefore, the first operation shaft 120 is prohibited from moving in the axial direction with respect to the first reclining unit 90.

  On the other hand, the second operation shaft 120 ′ of the second reclining unit 90 ′ is formed with a flange portion 120 b ′ that can contact the outer surface of the base plate 100 ′ of the second reclining unit 90 ′. However, since the push nut 121 is not provided like the first operation shaft 120 of the first reclining unit, the second operation shaft 120 ′ is transmitted so as to allow relative movement in the axial direction with respect to the second reclining unit. It is attached to the other end of the shaft 351.

  The first reclining unit 90 provided between the sub-lower arm 201 on one side and the upper arm 202 on one side of the seat back frame, the first operation shaft 120 inserted through the first reclining unit 90, and the other A second reclining unit 90 ′ provided between the sub-lower arm 201 ′ on the other side and the upper arm 202 ′ on the other side of the seat back frame, and a second operation shaft 120 ′ inserted through the second reclining unit 90 ′. The first operation shaft 120 is connected to an operation handle 353 that rotates the first operation shaft 120 in one direction, the first operation shaft 120, and the second operation shaft 120 ′. A transmission shaft 351 for transmitting the rotation of the rotation to the second operation shaft 120 ′; , The seat back assembly 355 is configured.

  The outer upper arm 202 and the inner upper arm 202 'of the seatback assembly 355 are integrated using other members to constitute a seatback frame.

  The seat back assembly 355 is assembled by attaching the first reclining unit 90 to the upper arm 202 on one side of the seat back frame and attaching the second reclining unit 90 'to the upper arm 202' on the other side of the seat back frame. The sub-lower arm 201 on one side of the seat cushion side is attached to the first reclining unit 90, the sub-lower arm 201 'on the other side of the seat cushion side is attached to the second reclining unit 90', and the first operation shaft 120 is transmitted. The second operation shaft 120 ′ is fixed to one end of the shaft 351 and the other end of the transmission shaft 351 is fixed.

The seat back assembly 355 is assembled in advance and attached to the lower arm main bodies 199 and 199 ′ of the seat cushion 3 already assembled on the floor side.
According to the configuration of such an embodiment, the following effects can be obtained.
(1) Since the first operation shaft 120 of the first reclining unit 90 provided with the operation handle 353 as the operation means is prohibited from moving in the axial direction with respect to the first reclining unit 90, the operation feeling is good. .
(2) The first operation shaft 120 is fixed to one end of the transmission shaft 351 and is not allowed to move in the axial direction with respect to the first reclining unit 90, and the second operation shaft 120 ′ is connected to the second reclining unit 90. When the seat back assembly 355 is attached to the lower arm main bodies 199, 199 'of the seat cushion 3 by being fixed to the other end of the transmission shaft 351 so as to allow relative movement in the axial direction with respect to' Even if there is an error in the dimension in the width direction of the three-dimensional body 355 and the dimension between the lower arm main bodies 199 and 199 ′ of the seat cushion 3, the integrated first operation shaft, transmission member, and second operation shaft have an axial direction. The operability is good.
(3) Since the transmission shaft 351 as the transmission member is fixed to the first operation shaft 120 and the second operation shaft 120 ′, the connection portion between the first operation shaft 120 and the transmission shaft 351, the transmission shaft 351 and the first operation shaft 120 ′. 2 There is no play in the circumferential direction at the connecting portion of the operation shaft 120 '. Therefore, in these portions, there is no synchronization delay between the first reclining unit 90 and the second reclining unit 90 ′.
<Second Embodiment>
This will be described with reference to FIG.

The difference between the present embodiment and the first embodiment is that the present embodiment has elastic means on the second operating shaft.
A push nut 401 as a flange portion that can come into contact with the seat of the second reclining unit 90 ′, that is, the ratchet plate 130 ′ is attached to the operation shaft 120 ′ of the present embodiment so as not to move in the axial direction. It has been. Further, the operation shaft 120 ′ is formed with a flange portion 120b ′ as a second flange portion that can contact the surface of the second reclining unit 90 ′ opposite to the surface facing the seat, that is, the base plate 100 ′. ing.

  The ratchet plate 130 ′ and the push nut 401 are in contact with each other between the ratchet plate 130 ′ that is a surface facing the seat of the second reclining unit 90 ′ and the push nut 401 that is the first collar portion. A wave washer (first elastic body) 403 is provided.

  Further, the base plate 100 and the second operation shaft 120 are disposed between the base plate 100 which is the surface opposite to the surface facing the seat of the second reclining unit 90 ′ and the collar portion 120 b ′ which is the second collar portion. A wave washer (second elastic body) 405 is provided in contact with the collar portion 120b.

  The seat back assembly 355 is assembled by attaching the first reclining unit 90 to the upper arm 202 on one side of the seat back frame and attaching the second reclining unit 90 'to the upper arm 202' on the other side of the seat back frame. The sub-lower arm 201 on one side of the seat cushion side is attached to the first reclining unit 90, the sub-lower arm 201 'on the other side of the seat cushion side is attached to the second reclining unit 90', and the first operation shaft 120 is transmitted. The second operation shaft 120 ′ is fixed to one end of the shaft 351 and the other end of the transmission shaft 351 is fixed.

The seat back assembly 355 is assembled in advance and attached to the lower arm main bodies 199 and 199 ′ of the seat cushion 3 already assembled on the floor side.
According to such a configuration, in addition to the effects of the first embodiment, the following effects can be obtained.
(1) In the first embodiment, when the second operation shaft 120 ′ and the transmission shaft 351 are fixed by welding or the like, the positioning of the second operation shaft 120 ′ with respect to the second reclining unit 90 ′ is This is done by the operator holding the second operation shaft 120 'by hand or the like. However, according to the present embodiment, the second operation shaft 120 ′ can be positioned at the neutral position by the wave washers 403 and 405, positioning by the operator's hand or the like is not necessary, and assembly is easy. Become.

Further, when the seat back assembly 355 is attached to the lower arm main bodies 199 and 199 ′ of the seat cushion 3, the actual dimensions in the width direction of the lower rail main body 199 and the lower arm main body 199 ′ and the actual dimensions in the width direction of the seat back assembly 355. Even if there is a dimensional error, the wave washer 403, 405 is elastically deformed in the axial direction of the operation shaft 120 ′, so that the dimensional error can be absorbed.
(2) The second operation shaft 120 ′ can be assembled to the second reclining unit 90 ′ in advance, and the push nut 401 and the wave washers 403, 405 can be assembled in advance, so that the assembly of the both-side reclining mechanism is facilitated. .
<Third Embodiment>
This will be described with reference to FIG.

The difference between the present embodiment and the first embodiment is that a coil spring 411 is used instead of the spiral spring 321 ′.
The coil spring 411 has an intermediate portion wound around the second operation shaft 120 ′ along the axial direction, one end locked to the second operation shaft 120 ′, and the other end on the seat cushion side. The second operation shaft 120 ′ is urged in a direction that is locked by the second spring locking portion 301 ′ of the sub-lower arm 201 ′ and prohibits the tilting of the seat back.

  The seat back assembly 355 is assembled by attaching the first reclining unit 90 to the upper arm 202 on one side of the seat back frame and attaching the second reclining unit 90 'to the upper arm 202' on the other side of the seat back frame. The sub-lower arm 201 on one side of the seat cushion side is attached to the first reclining unit 90, the sub-lower arm 201 'on the other side of the seat cushion side is attached to the second reclining unit 90', and the first operation shaft 120 is transmitted. The second operation shaft 120 ′ is fixed to one end of the shaft 351 and the other end of the transmission shaft 351 is fixed.

The seat back assembly 355 is assembled in advance and attached to the lower arm main bodies 199 and 199 ′ of the seat cushion 3 already assembled on the floor side.
According to such a configuration, in addition to the effects of the first embodiment, the following effects can be obtained.
(1) In the first embodiment, when the second operation shaft 120 ′ and the transmission shaft 351 are fixed by welding or the like, the positioning of the second operation shaft 120 ′ with respect to the second reclining unit 90 ′ is This is done by the operator holding the second operation shaft 120 'by hand or the like. However, according to the present embodiment, the second operating shaft 120 ′ can be positioned at the neutral position by the coil spring 411, positioning by the operator's hand or the like is not necessary, and assembly is facilitated.

Further, when the seat back assembly 355 is attached to the lower arm main bodies 199 and 199 ′ of the seat cushion 3, the actual dimensions in the width direction of the lower arm main body 199 and the lower arm main body 199 ′, and the actual width direction of the seat back assembly 355 are reduced. Even if there is a dimensional error between the dimensions, the dimensional error can be absorbed by the coil spring 411 being elastically deformed in the axial direction of the operation shaft 120 ′.
(2) The elastic means has an intermediate portion wound around the second operation shaft 120 ′ in the axial direction, one end portion locked to the second operation shaft 120 ′, and the other end portion on the seat cushion side. By using the coil spring 411 that is locked to the second spring locking portion 301 ′ of the sub-lower arm 201 ′ and biases the second operation shaft 120 ′ in a direction that prohibits tilting of the seat back, By the elastic means, the positioning of the second operation shaft 120 ′ and the backlash between the second operation shaft 120 ′ and the second reclining unit, that is, the backlash between the operation shaft 120 ′ and the cam 170 ′ of the second reclining unit 90 ′. Can be absorbed.

It is a figure explaining the invention part of the example of 1st Embodiment. FIGS. 2A and 2B are diagrams for explaining a first spring locking portion and a second spring locking portion of FIG. 1, in which FIG. 1A is an exploded perspective view, and FIG. It is a side view of the sheet | seat of 1st Embodiment. It is a front view of the reclining unit of the sheet in the first embodiment. FIG. 5 is a cross-sectional view taken along a cutting line CC in FIG. 4 with an upper arm and a lower arm added. It is a rear view of the reclining unit shown in FIG. FIG. 5 is a cross-sectional view taken along a cutting line DD in FIG. 4. It is sectional drawing in the cutting line EE of FIG. It is the figure which removed the release plate of FIG. It is a disassembled perspective view of the principal part of the sheet | seat of 1st Embodiment. It is a figure explaining the whole structure of the sheet | seat of the example of 1st Embodiment. It is a figure explaining the invention part of the example of a 2nd embodiment. It is a figure explaining the invention part of the example of 3rd Embodiment. It is a figure explaining a prior art example. It is a figure explaining a prior art example.

Explanation of symbols

90 1st reclining unit 90 '2nd reclining unit 120 1st operation shaft 120' 2nd operation shaft 351 Transmission shaft

Claims (4)

A first reclining unit which is provided on one side of the seat and locks / unlocks the tilt of the seat back relative to the seat cushion;
A first operating shaft that is provided along the tilting central axis of the seatback, passes through the first reclining unit, and rotates in one direction about the axis as a central axis, thereby bringing the first reclining unit into an unlocked state. When,
A second reclining unit provided on the other side of the seat for locking / unlocking the tilt of the seat back relative to the seat cushion;
A second operating shaft that is provided along the tilting central axis of the seatback, passes through the second reclining unit, and rotates in one direction about the axis as a central axis, thereby bringing the second reclining unit into an unlocked state. When,
Operating means provided on the first operating shaft and rotating the first operating shaft in one direction;
A transmission member that connects the first operation shaft and the second operation shaft, and transmits the rotation of the first operation shaft to the second operation shaft;
In the double-sided reclining mechanism having
The first operation shaft is fixed to one end of the transmission member, and axial movement with respect to the first reclining unit is prohibited,
The second operation shaft is fixed to the other end of the transmission member so as to allow relative movement in the axial direction with respect to the second reclining unit ,
A double-sided reclining mechanism comprising elastic means that is elastically deformable in the axial direction of the second operating shaft and that positions the second reclining unit in the axial direction with respect to the second operating shaft . In the second operation shaft,
A first collar portion capable of coming into contact with a surface facing the seat of the second reclining unit;
A second collar portion capable of contacting a surface opposite to a surface facing the seat of the second reclining unit;
Provided,
The elastic means is
A first elastic body that abuts against a surface of the second reclining unit facing the seat and the first collar portion;
A second elastic body in contact with a surface opposite to the surface facing the seat of the second reclining unit, and the second collar portion;
Sides reclining mechanism according to claim 1, characterized in that it consists of. The elastic means is
A coil spring in which an intermediate portion is wound around the second operation shaft in the axial direction, one end is locked to the second operation shaft, and the other end is locked to the seat side. The double-sided reclining mechanism according to claim 1 . A first reclining unit which is provided on one side of the seat and locks / unlocks the tilt of the seat back relative to the seat cushion;
A first operating shaft that is provided along the tilting central axis of the seatback, passes through the first reclining unit, and rotates in one direction about the axis as a central axis, thereby bringing the first reclining unit into an unlocked state. When,
A second reclining unit provided on the other side of the seat for locking / unlocking the tilt of the seat back relative to the seat cushion;
A second operating shaft that is provided along the tilting central axis of the seatback, passes through the second reclining unit, and rotates in one direction about the axis as a central axis, thereby bringing the second reclining unit into an unlocked state. When,
Operating means provided on the first operating shaft and rotating the first operating shaft in one direction;
A transmission member that connects the first operation shaft and the second operation shaft, and transmits the rotation of the first operation shaft to the second operation shaft;
In the assembling method of the both-side reclining mechanism having
The lower arm located on the side of the seat cushion frame is composed of a lower arm main body and a sub-lower arm attached to the lower arm main body,
Prohibiting axial movement of the first operating shaft relative to the first reclining unit;
Allowing an axial relative movement of the second operating shaft relative to the second reclining unit;
The first reclining unit is attached to the upper arm on one side of the seat back frame,
Attach the second reclining unit to the upper arm on the other side of the seat back frame,
A sub-lower arm on one side of the seat cushion side is attached to the first reclining unit,
A sub-lower arm on the other side of the seat cushion side is attached to the second reclining unit,
After assembling the seat back assembly by fixing the first operation shaft to one end of the transmission member and fixing the second operation shaft to the other end of the transmission member, the assembly is fixed to the floor side. the lower arm method of assembling the both side reclining mechanism characterized in that attached to the body.

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