JP2006131019A - Seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat favorable in operability. <P>SOLUTION: This seat has a two-stage folding energizing means to energize a two-stage folding mechanism 115 to prohibit rotation against an upper arm 109 of a seat back frame 113 in the locking direction and an unlocking interlocking mechanism 201 to continue to unlock the two-stage folding mechanism 115 until the seat back frame 113 rotates toward a forward falling state when the upper arm 109 is rotated forward by unlocking a reclining mechanism 111 when the seat back frame 113 is used. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a lower arm provided in a seat cushion, an upper arm provided at a lower portion of the seat back and rotatably provided in a front-rear direction with respect to the lower arm, an upper arm provided at an upper portion of the seat back, and A seat back frame that is rotatably provided in the front-rear direction, a reclining mechanism that locks / unlocks rotation of the upper arm with respect to the lower arm, and the seat back frame can support the back of the seated person in cooperation with the upper arm The present invention relates to a seat having a two-stage folding mechanism that locks the rotation of the seat back frame in two states, a use state and a forward-turned state that is forward-turned with respect to the upper arm.

  2. Description of the Related Art Some seat devices mounted on automobiles or the like usually rotate a seat back in a standing state with respect to a seat cushion so that the back surface can be used as a table or a seating surface.

  An example of such a sheet is shown in FIG. In the figure, the seat 1 has a seat cushion 3 that supports a seated person's buttocks and a seat back 5 that supports the seated person's back.

  The seat cushion 3 is provided with a lower arm 7, and an upper arm 9 provided so as to be rotatable in the front-rear direction with respect to the lower arm 7 is provided below the seat back 5. A seat back frame 13 provided so as to be rotatable in the front-rear direction with respect to the upper arm 9 is provided on the upper portion of the seat back 5. A reclining mechanism 11 that locks / unlocks rotation of the upper arm 9 with respect to the lower arm 7 and a use state in which the seat back frame 13 can support the back of the seated person in cooperation with the upper arm 9 (M and L states in the figure), A two-stage folding mechanism 15 is provided that locks the rotation of the seat back frame 13 in two states of being forwardly tilted with respect to the upper arm 9 (N state in the figure).

  The upper arm 9 can be tilted between an upright state (M state in the drawing) and a reverse state (L state in the drawing) around the rotation center shaft 11a by operating the operation lever 11b of the reclining mechanism 11. It has become.

Further, by operating the operation lever 15b of the two-stage folding mechanism 15, the seat back frame 13 is in a use state (M state in the figure) and a forward-turned state (N state in the figure) around the rotation center shaft 15a. It is possible to take these two states (see, for example, Patent Document 1).
JP 2002-101992 A (FIG. 1)

However, in the seat having the configuration shown in FIG. 10, when the back surface of the seat back 5 of the seat 1 in a seatable state is used as a table or a seat surface, the following operation procedure is necessary.
(1) The operation lever 11b of the reclining mechanism 11 is operated to release the lock of the reclining mechanism 11, and the upper arm 9 is raised (M state in FIG. 10).
(2) The operation lever 15b of the two-stage folding mechanism 15 is operated to release the lock of the two-stage folding mechanism 15, and the seat back frame 13 is brought forward (N state in FIG. 10).

As described above, it is necessary to operate the operation levers of the reclining 11 and the two-stage folding mechanism 15, respectively.
The present invention has been made in view of the above problems, and an object thereof is to provide a sheet having good operability.

  The invention according to claim 1, which solves the above problem, includes a lower arm provided in a seat cushion, an upper arm provided at a lower portion of the seat back and rotatably provided in the front-rear direction with respect to the lower arm, and an upper portion of the seat back. And a reclining mechanism that locks / unlocks the rotation of the upper arm with respect to the lower arm, and the seat back frame jointly with the upper arm. A two-stage folding mechanism that locks the rotation of the seat back frame in two states: a use state capable of supporting the back of the seated person and a forward-turned state that is forward-fallen with respect to the upper arm; A two-stage folding biasing means for biasing the stage folding mechanism in the locking direction; When the seat back frame is in use, when the reclining mechanism is unlocked and the upper arm is rotated forward, the two-stage folding urging means is applied until the seat back frame rotates toward the forward tilted state. It is a seat having an unlocking interlocking mechanism that continues to unlock the two-stage folding mechanism against a force.

  When the seat back frame is in use, when the reclining mechanism is unlocked and the upper arm is rotated forward, the unlocking interlock mechanism causes the two-fold folding until the seat back frame rotates toward the forward tilted state. The mechanism continues to be unlocked.

  When the upper arm is rotated forward, the seat back is rotated toward the forward tilted state to be in the forward tilted state, and when the upper arm is further rotated forward, the two-fold folding mechanism is locked by the two-fold folding biasing means.

  According to a second aspect of the present invention, the unlocking interlocking mechanism is rotatably provided on the upper arm side, and has a contact surface for pressing the unlocking member of the two-stage folding mechanism to unlock the two-stage folding mechanism. The unlocking means and one end of the unlocking means are rotatably attached to a place other than the rotation center of the unlocking means, the other end is rotatably attached to the lower arm, and the unlocking is performed when the upper arm rotates forward. The contact surface of the means consists of a link that rotates the unlocking means so as to push the unlocking member of the two-stage folding mechanism, and the contact surface of the unlocking means is in a state where the seat back frame is in use, When the reclining mechanism is unlocked and the upper arm is rotated forward, the seat back frame is rotated toward its forward-turned state by its own weight. 2. The apparatus according to claim 1, wherein the two-stage folding mechanism is set to release the lock against the urging force of the two-stage folding urging means by pushing the unlocking member of the two-stage folding mechanism until the second stage folding mechanism is pushed. This is a sheet.

  When the seat back frame is in use and the reclining mechanism is unlocked and the upper arm is rotated forward, it is pulled by the link, the unlocking means rotates, and the contact surface of the unlocking means has two steps. The lock release member of the folding mechanism is pushed to unlock the two-stage folding mechanism. When the upper arm is rotated forward, the seat back is rotated toward the forward tilted state to be in the forward tilted state, and when the upper arm is further rotated forward, the two-fold folding mechanism is locked by the two-fold folding biasing means.

  The invention according to claim 3 is provided on the lower arm side, a plate provided rotatably on the rotation center axis of the reclining mechanism, and the link being rotatably connected to a place other than the rotation center axis, 3. A lower stopper capable of contacting the plate when the upper arm rotates forward, and plate urging means for urging the plate in a direction in which the plate abuts against the lower stopper. It is a sheet.

When the upper arm rotates forward, the plate comes into contact with the lower stopper, and when the upper arm further rotates forward, the link pulls the unlocking means.
In the invention according to claim 4, when the upper arm rotates forward in the unlocking interlock mechanism, the contact surface of the unlocking means pushes the unlocking member of the two-stage folding mechanism in the unlocking direction to unlock. 3. An idle swinging mechanism is provided for overcoming the unlocking member of the two-stage folding mechanism in which the unlocking means is in the locked position when the upper arm rotates backward after unlocking. It is a sheet of description.

  When the reclining mechanism is unlocked and the upper arm is rotated forward while the seat back frame is in use, the contact surface pushes the unlocking lever of the two-stage folding mechanism in the unlocking direction, and then the upper arm is moved backward. When rotating in the reverse direction, the lock release means gets over the lock release member of the two-stage folding mechanism in the lock position by the idle swing mechanism.

  According to a fifth aspect of the present invention, the idle swing mechanism is provided on the unlocking member of the two-stage folding mechanism, and is provided rotatably on the pin on which the abutment surface of the unlocking interlocking mechanism can abut and on the upper arm side. A cancel base on which the link is rotatably mounted, a cancel plate that is rotatably provided on the cancel base and has the contact surface formed on one side surface thereof, and a cancel base that is provided on the cancel base. When the plate abuts, when the upper arm rotates forward, the abutment surface can press the pin of the unlocking member of the two-stage folding mechanism, and the cancel plate abuts the stopper. 5. The sheet according to claim 4, further comprising cancel plate urging means for urging in a contacting direction.

  When the seat back frame is in use and the reclining mechanism is unlocked and the upper arm is rotated forward, the contact surface of the cancel plate that contacts the stopper of the cancel base unlocks the unlock lever of the two-stage folding mechanism Push in the direction.

  Thereafter, when the upper arm rotates rearward, the pin comes into contact with the cancel plate, and the cancel plate is pushed by the pin and rotates away from the stopper to get over the pin.

  The invention according to claim 6 is the seat according to claim 1, further comprising upper arm urging means for urging the upper arm in a direction to rotate forward with respect to the lower arm.

When the reclining mechanism is unlocked, the upper arm rotates forward by the biasing force of the upper arm biasing means.
The invention according to claim 7 is the seat according to claim 1 or 5, further comprising seat back frame urging means for urging the seat back frame in a direction to rotate forward with respect to the upper arm. is there.

  When the two-stage folding mechanism is unlocked, the seat back frame rotates forward by the urging force of the seat back frame urging means.

  According to the first, second, sixth, and seventh aspects of the present invention, when the seat back frame is in use, when the reclining mechanism is unlocked and the upper arm is rotated forward, the unlocking interlock mechanism causes the seat to The two-stage folding mechanism continues to be unlocked until the back frame rotates toward the forward tilted state, the upper arm rotates forward, the seat back rotates toward the forward tilted state, enters the forward tilted state, and the upper arm When rotating forward, the two-stage folding mechanism is locked by the two-stage folding urging means.

Since the operation of unlocking the two-stage folding mechanism becomes unnecessary, the operability is good.
According to the invention which concerns on Claim 2, one end part is rotatably attached to locations other than the rotation center of the unlocking means, the other end part is rotatably attached to the lower arm, and the upper arm rotates forward. The movement of the upper arm can be reliably transmitted to the lock release means by using a link that rotates the lock release means so that the contact surface of the lock release means pushes the lock release member of the two-stage folding mechanism. it can.

  According to the invention of claim 3, in the seatable state where the operation of the unlocking interlocking mechanism is not required, the unlocking means is operated by the forward rotation of the upper arm by preventing the plate from coming into contact with the lower stopper. Can be prevented.

  According to the invention of claim 4, when the upper arm rotates forward in the unlock mechanism, the contact surface of the unlock mechanism pushes the unlock member of the two-stage folding mechanism in the unlock direction and locks. After the unlocking and unlocking, when the upper arm rotates backward, the unlocking means is provided with an idle swing mechanism that gets over the unlocking member of the two-stage folding mechanism in the locked position, so that the upper arm is moved forward. After the two-stage folding mechanism is unlocked by rotating to the second stage, even if the upper arm rotates rearward, the unlocking means gets over the unlocking member of the two-stage folding mechanism in the locked position. The upper arm can be rotated rearward while is kept locked.

  According to a fifth aspect of the present invention, the idle swing mechanism is provided on the unlocking member of the two-stage folding mechanism, and is rotatable to the pin on which the abutment surface of the unlocking interlocking mechanism can abut and to the upper arm side. A cancel base on which the link is rotatably mounted, a cancel plate which is rotatably provided on the cancel base and has the contact surface formed on one side surface thereof, and the cancel plate abuts Due to this, when the upper arm rotates forward, the contact surface urges the cancel plate to contact the stopper, and a stopper that allows the pin of the unlocking member of the two-stage folding mechanism to be pressed. After canceling the lock of the two-stage folding mechanism by rotating the upper arm forward, Even if the upper arm rotates rearward, the unlocking means moves over the unlocking member of the two-stage folding mechanism in the locked position, thereby rotating the upper arm rearward while keeping the two-stage folding mechanism locked. be able to.

  According to the invention of claim 6, by providing the upper arm urging means for urging the upper arm forward relative to the lower arm, when the reclining mechanism is unlocked, the upper arm is urged by the urging force of the upper arm urging means. Since it rotates forward, operability is good.

  According to the seventh aspect of the invention, when the two-stage folding mechanism is unlocked, the seat back frame is rotated forward by the biasing force of the seat back frame biasing means, so that the operability is good.

  Initially, the whole structure of the sheet | seat of this embodiment is demonstrated using FIG. In the figure, a seat 101 has a seat cushion 103 that supports a seated person's buttocks and a seat back 105 that supports the back of the seated person.

  A lower arm 107 is provided on the seat cushion 103, and an upper arm 109 provided so as to be rotatable in the front-rear direction with respect to the lower arm 107 is provided below the seat back 105. A seat back frame 113 is provided on the upper portion of the seat back 105 so as to be rotatable in the front-rear direction with respect to the upper arm 109. Then, the reclining mechanism 111 that locks / unlocks the rotation of the upper arm 109 with respect to the lower arm 107, and the seat back frame 113 in cooperation with the upper arm 109 are in a use state in which the back of the seated person can be supported. A two-stage folding mechanism 115 is provided that locks the rotation of the seat back frame 113 in two states of the front-down state.

  In this embodiment, upper arm urging means (not shown) for urging the upper arm 109 in the direction of rotating forward with respect to the lower arm 107, and urging the seat back frame 113 in the direction of rotating forward with respect to the upper arm 109 are illustrated. And a seat back frame urging means (not shown). Further, the upper arm 109 can rotate about 30 degrees forward from the state shown in FIG. In addition, the seat back frame 113 can be used in a state of being able to support the back of the seated person in cooperation with the upper arm 109 as shown in FIG. It is possible to rotate between.

  Then, when the seat back frame 113 is in use, when the reclining mechanism 111 is unlocked and the upper arm 109 is rotated forward, the two-stage folding mechanism 115 is unlocked until the seat back frame 113 rotates toward the forward-turned state. An unlocking interlocking mechanism 201 that continues to be provided is provided. In the two-stage folding mechanism 115, 117 is an operation lever that is urged in the lock direction (arrow I direction) by an urging means (not shown).

  The unlocking interlocking mechanism 201 is rotatably provided on the upper arm 109 side by using a stepped pin 303 and pushes a pin 119 provided on an operation lever 117 which is a lock releasing member of the two-stage folding mechanism 115 to thereby form a two-stage. An unlocking means 203 having an abutment surface 205 for unlocking the folding mechanism 115, one end of which is rotatably attached to a portion other than the center of rotation of the unlocking means 203 using a pin 211, and the other end is a lower arm The link 131 is rotatably attached to 107. When the seat back frame 113 is in use and the reclining mechanism 111 is unlocked and the upper arm 109 is rotated forward, the abutment surface 205 of the unlocking means 203 is moved toward the forward tilted state. It is set so that the two-stage folding mechanism 115 is unlocked by pushing the pin 119 of the operation lever 117 which is a lock release member of the two-stage folding mechanism 115 until it rotates.

  In this embodiment, the other end of the link 131 can be rotated using a pin 133 at a place other than the rotation center axis 112 of the plate 135 that is rotatably attached to the rotation center axis 112 of the reclining mechanism 111. It is connected. Further, the lower arm 107 is provided with an upper stopper 214, and the upper arm 109 is rotatable within a range where the two convex portions 109b and the convex portion 109c formed on the upper arm 109 abut on the upper stopper 214.

Then, the plate urging means urges the plate 135 in the direction of arrow II, that is, the direction in contact with the lower stopper 213 (details will be described later).
In the unlocking interlock mechanism 201, when the upper arm 109 rotates forward, the contact surface 205 of the unlocking means 203 is locked by pushing the pin 119 of the operation lever 117, which is the unlocking member of the two-stage folding mechanism 115, in the unlocking direction. After releasing and releasing the lock, when the upper arm 109 rotates backward, the unlocking mechanism 203 gets over the pin 119 of the operation lever 117 that is the lock release member of the two-stage folding mechanism 115 in the lock position. Is provided.

Here, the idle swing mechanism 301 will be described with reference to FIG. 2 which is an exploded perspective view of the unlocking means 203 of FIG. 1 and FIG.
A cancel base 305 is rotatably provided on the upper arm 109 using a stepped pin 303. One end of the link 131 described above is rotatably attached to the cancel base 305 using a pin 211. The intermediate portion is wound around the large-diameter portion of the stepped pin 303, one end is locked in the hole 109 a of the upper arm 109, and the other end is locked in the hole 305 b of the cancel base 305. The cancel base 305 is biased with respect to the upper arm 109 in the direction of pulling the link 131 around the stepped pin 303 (in the direction of arrow III in FIG. 2) by the biasing force of 306. This urging force acts on the plate 135 via the link 131, and serves as the plate urging means described above.

  Further, a cancel plate 309 is rotatably attached to the cancel base 305 using a stepped pin 307. One side surface of the cancel plate 309 is formed with a contact surface 205 that presses the pin 119 of the operation lever 117 of the two-stage folding mechanism 115 described above. Further, the cancel plate 309 is formed with a stopper portion 309 a that can come into contact with the stopper surface 305 a on the side surface of the cancel base 305. Then, the intermediate portion is wound around the large diameter portion of the stepped pin 307, one end is locked to the hole 305c of the cancel base 305, and the other end is locked to the cancel plate 309. Due to the urging force of the spring 311 as the urging means, the cancel plate 309 is in contact with the cancel base 305 in the direction in which the stopper portion 309a abuts against the stopper surface 305a of the cancel base 305 around the stepped pin 307 (in FIG. Direction).

  When the stopper portion 309a of the cancel plate 309 contacts the stopper surface 305a of the cancel base 305, when the upper arm 109 rotates forward, the contact surface 205 of the cancel plate 309 is folded in two steps and the operation lever 117 of the mechanism 115 is disengaged. The pin 207 can be pushed. On the other hand, when the other side surface of the cancel plate 309, that is, the surface 205a facing the contact surface 205 contacts the pin 207 of the operation lever 117, the cancel plate 309 is rotated by being pushed by the pin 207. ing.

Next, the two-stage folding mechanism 115 will be described with reference to FIGS. 1 and 3. In the figure, a lock plate 401 is provided at the lower end of the seat back frame 113.
The rotation center shaft 403 of the seat back frame 113 with respect to the upper arm 109 protrudes outside after passing through the lock plate 401, and an operation lever 117 is rotatably attached to the external protruding portion. The operation lever 117 is formed with a long hole 118 set so that the distance from the rotation center axis 403 is gradually increased. On the other hand, an elongated hole 407 extending toward the rotation center axis 403 is formed in the upper arm 109.

  Further, at the periphery of the lock plate 401, two grooves that pass over the elongated hole 407 of the upper arm 109, that is, a use state lock groove 411 and a forward tilt state lock groove 413, are obtained by rotating the lock plate 401. The two lock grooves are formed. Both the long hole 407 and the long hole 118 are provided with lock pins 415 that are movably engaged with the long holes. The lock pin 415 is guided by the elongated hole 118 by the biasing means that biases the operation lever 117 in the direction of the arrow I, and engages with the use state lock groove 411 or the forward tilted lock groove 413 of the lock plate 401. The rotation of the seat back frame 113 is prohibited. Further, by rotating the operation lever 117 counterclockwise against the urging force of the urging means, the lock pin 415 is detached from the use state lock groove 411 or the forward tilt state lock groove 413 of the lock plate 401, and the seat The back frame 113 is in a rotatable state.

  Next, the operation of the above configuration will be described with reference to FIGS. 1 and 4 to 9. FIG. 1 shows a state in which the two-stage folding mechanism 115 is in use and the reclining mechanism 111 is in an intermediate position. 4 to 8 are views for explaining the operation when the upper arm 109 is rotated forward by using the reclining mechanism 111 from the state shown in FIG. 1 and the seat back frame 113 is brought into the forward tilted state, and FIG. 9 is the state shown in FIG. It is a figure explaining the action | operation when rotating the upper arm 109 back using the reclining mechanism 111 from back.

  The state in FIG. 1 shows a state where the two-stage folding mechanism 115 is in use and the reclining mechanism 111 is in an intermediate position. At this time, the cancel base 305 is biased in the direction of pulling the link 131 by the biasing force of the spring 306, and the upper portion of the plate 135 is in contact with the upper stopper 214.

  When the reclining mechanism 111 is unlocked from the state of FIG. 1, the upper arm 109 starts to rotate about 30 degrees toward the front by a biasing means (not shown). At this time, as shown in FIG. 4, the plate 135 is rotated counterclockwise by the link 131, and the lower portion of the plate 135 comes into contact with the lower stopper 213.

  Further, when the upper arm 109 rotates forward, as shown in FIG. 5, the cancel base 305 of the lock release means 203 rotates counterclockwise, and the contact surface 205 of the cancel plate 309 is folded in two steps. It contacts the pin 119 of 117.

  When the upper arm 109 further rotates forward, the contact surface 205 of the cancel plate 309 is pushed while sliding on the pin 119 of the operation lever 117 of the two-stage folding mechanism 215 as shown in FIGS. 117 rotates counterclockwise, that is, in the unlocking direction, and the two-stage folding mechanism 115 is unlocked.

  When the two-stage folding mechanism 115 is unlocked, the seat back frame 113 that has been in use is rotated forward by an urging force of an urging means (not shown), and is brought into a forward tilted state. At this time, when the upper arm 109 rotates about 30 degrees from the state shown in FIG. 1, the contact surface 205 of the cancel plate 309 of the unlocking means 203 comes off from the pin 119 of the operation lever 117 of the two-stage folding mechanism 115, thereby The operation lever 117 of the two-stage folding mechanism 115 is rotated in the clockwise direction by an urging means (not shown) and locked in the retracted state, so that the back surface of the seat back 105 can be used as a table or a seating surface.

  When returning from the state shown in FIG. 8 to the state shown in FIG. 1, the reclining mechanism 111 is unlocked and the upper arm 109 is rotated backward. Then, the surface 205 a of the unlocking means 203 facing the contact surface 205 of the cancel plate 309 contacts the pin 119 of the operation lever 117 of the two-stage folding mechanism 115, and the cancel plate 309 resists the biasing force of the spring 311. As shown in FIG. 9, the cancel plate 309 gets over the pin 119 of the operation lever 117 of the two-stage folding mechanism 115. That is, the two-stage folding mechanism 115 is not unlocked. When the cancel plate 309 gets over the pin 119, the rotation is restored until the stopper portion 309 a of the cancel plate 309 comes into contact with the stopper surface 305 a of the cancel base 305 due to the biasing force of the spring 311.

Then, the two-stage folding mechanism 115 is unlocked using the operation lever 117, and the seat back frame 113 is returned to the use state to return to the state shown in FIG.
According to such a configuration, the following effects can be obtained.
(1) When the reclining mechanism 111 is unlocked and the upper arm 109 is rotated forward while the seat back frame 113 is in use, the two-stage folding mechanism 115 is unlocked by the unlocking interlock mechanism 201 and is in use. The seat back frame 113 is stored. Therefore, since the operation for unlocking the two-stage folding mechanism 115 is not required, the operability is good.
(2) When one end is rotatably attached to a place other than the center of rotation of the unlocking means 203, the other end is rotatably attached to the lower arm, and the upper arm 109 rotates forward, the abutment of the unlocking means 203 The movement of the upper arm 109 can be reliably transmitted to the lock release means 203 by using the link 131 that rotates the lock release means 203 so as to push the lock release member of the two-stage folding mechanism 115.
(3) The plate 135 and the lower stopper 213 that can contact the lower portion of the plate 135 when the upper arm 109 rotates forward are provided. That is, in the seatable state where the operation of the unlocking interlock mechanism 201 is not necessary, the operation of the unlocking means 203 due to the forward rotation of the upper arm 109 is prevented by preventing the plate 135 from coming into contact with the lower stopper 213. Can do.
(4) By providing the idling mechanism 301, the unlocking means 203 is in the locked position even if the upper arm 109 rotates backward after the upper arm 109 is rotated forward to unlock the two-stage folding mechanism 115. By climbing over the pin 119 of the operation lever 117 of the two-stage folding mechanism 115, the upper arm 109 can be rotated backward while the two-stage folding mechanism 115 is in a locked state.
(5) By providing the upper arm urging means for urging the upper arm 109 forward with respect to the lower arm 107, when the reclining mechanism 111 is unlocked, the upper arm 109 rotates forward by the urging force of the upper arm urging means. So operability is good.
(6) When the two-stage folding mechanism 115 is unlocked, the seat back frame 113 is rotated forward by the biasing force of the seat back frame 113 biasing means, so that the operability is good.

  In addition, this invention is not limited to the said example of a form. In the above-described embodiment, an example in which an urging unit that rotates the seat back frame 113 forward is described. However, the two-stage folding mechanism 115 is changed until the seat back frame 113 rotates toward its forward-falling state due to its own weight. If the unlocking interlocking mechanism 201 is set so as to continue unlocking, there is no need for such a biasing means.

It is a figure explaining the whole structure of a sheet. It is a disassembled perspective view of the lock release means of FIG. It is a figure explaining the 2 step | paragraph folding mechanism of FIG. It is a figure explaining the action | operation when an upper arm is rotated ahead using the reclining mechanism from the state of FIG. It is a figure explaining the action | operation when rotating an upper arm ahead using a reclining mechanism from the state of FIG. It is a figure explaining the action | operation when an upper arm is rotated ahead using the reclining mechanism from the state of FIG. It is a figure explaining the action | operation when an upper arm is rotated ahead using a reclining mechanism from the state of FIG. It is a figure explaining the action | operation when an upper arm is rotated ahead using a reclining mechanism from the state of FIG. It is a figure explaining the action | operation when returning from the state of FIG. 8 to the state of FIG. It is a figure explaining a prior art example.

Explanation of symbols

107 Lower arm 109 Upper arm 111 Reclining mechanism 113 Seat back frame 115 Two-stage folding mechanism 201 Unlocking interlocking mechanism

Claims (7)

A lower arm provided in the seat cushion;
An upper arm provided at a lower portion of a seat back and rotatably provided in the front-rear direction with respect to the lower arm;
A seat back frame provided at an upper portion of the seat back and rotatably provided in the front-rear direction with respect to the upper arm;
A reclining mechanism for locking / unlocking rotation of the upper arm with respect to the lower arm;
Two-stage folding that locks the rotation of the seat back frame in two states: a use state in which the seat back frame can support the back of the seated person in cooperation with the upper arm, and a forward fall state in which the seat back frame has fallen forward relative to the upper arm Mechanism,
In a sheet having
A two-stage folding biasing means for biasing the two-stage folding mechanism in the locking direction;
When the seat back frame is in use and the reclining mechanism is unlocked and the upper arm is rotated forward, the two-stage folding urging means is applied until the seat back frame rotates toward the forward tilted state. An unlocking interlocking mechanism that continues to unlock the two-stage folding mechanism against the force,
A sheet characterized by comprising: The unlocking interlock mechanism is
Unlocking means provided rotatably on the upper arm side, and having a contact surface for unlocking the two-stage folding mechanism by pushing the unlocking member of the two-stage folding mechanism;
When one end is rotatably attached to a place other than the center of rotation of the unlocking means, the other end is rotatably attached to the lower arm, and the upper arm rotates forward, the contact surface of the unlocking means A link that rotates the unlocking means to push the unlocking member of the two-stage folding mechanism,
When the seat back frame is in use and the reclining mechanism is unlocked and the upper arm is rotated forward, the abutment surface of the unlocking means rotates toward the forward tilted state by its own weight. 2. The apparatus according to claim 1, wherein the two-stage folding mechanism is set to release the lock against the urging force of the two-stage folding urging means by pushing the unlocking member of the two-stage folding mechanism until the second stage folding mechanism is pushed. Sheet. A plate that is rotatably provided on a rotation center axis of the reclining mechanism, and the link is rotatably connected to a place other than the rotation center axis;
A lower stopper, which is provided on the lower arm side and is capable of contacting the plate when the upper arm rotates forward;
Plate urging means for urging the plate in a direction in contact with the lower stopper;
The sheet according to claim 2, wherein the sheet is provided. In the unlocking interlock mechanism,
When the upper arm rotates forward, the abutment surface of the unlocking means pushes the unlocking member of the two-stage folding mechanism in the unlocking direction to release the lock, and when the upper arm rotates backward after unlocking. 3. The seat according to claim 2, further comprising an idle swinging mechanism for overcoming the unlocking member of the two-stage folding mechanism in which the unlocking means is in the locked position. The idling mechanism is
A pin provided on the unlocking member of the two-stage folding mechanism, the abutting surface of the unlocking interlocking mechanism being abuttable;
A cancel base that is rotatably provided on the upper arm side and to which the link is rotatably attached;
A cancel plate that is rotatably provided on the cancel base and has the contact surface formed on one side surface;
A stopper provided on the cancel base, wherein the cancel plate abuts to allow the abutment surface to push a pin of the unlocking member of the two-stage folding mechanism when the upper arm rotates forward; ,
Cancel plate urging means for urging the cancel plate in a direction to contact the stopper;
The sheet according to claim 4, comprising:   2. The seat according to claim 1, further comprising upper arm urging means for urging the upper arm in a direction to rotate forward with respect to the lower arm.   6. The seat according to claim 1, further comprising a seat back frame urging unit that urges the seat back frame in a direction to rotate forward with respect to the upper arm.

Images