JP5862355B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. Specifically, a locking device that locks the backrest angle of the seatback is provided on both the left and right sides of the seatback, and a connecting rod that serves as a power transmission member for simultaneously releasing the locked state between the locking devices. The present invention relates to a vehicle seat that extends in the axial direction.

  Conventionally, in a vehicle seat, a configuration in which a pair of reclining devices is provided between a seat back and a seat cushion is known (Patent Document 1). These reclining devices function as a rotation shaft device capable of stopping rotation that allows adjustment of the backrest angle of the seat back, and are normally held in a state where the backrest angle of the seat back is locked. . These reclining devices are switched to a state in which the locked state of the seat back can be changed by changing the operation state of the operation shaft inserted through the center of the reclining device. The operation shafts are connected to each other by a connecting rod so that they can rotate integrally with each other, and each operation shaft is operated by pulling up a release lever that is connected to the end of the operation shaft on one side. The shafts are simultaneously operated to release the locked state of each reclining device. The connecting rod described above is entirely covered with a pipe-shaped protective member so that the seating occupant will not be bent or damaged by the load on the seat back. It is in a state.

Japanese Patent Laid-Open No. 9-207639

  In the above prior art, if there is no protective member for protecting the connecting rod, the rear part of the occupant is pushed when the back of the seated occupant is pressed against the back of the seat, such as by a rear collision of the vehicle. There is a possibility that the (lumbar region) interferes with the connecting rod, and the connecting rod is pushed in the releasing operation direction by friction with the momentum. However, since setting the protection member leads to an increase in the number of parts and manufacturing cost, it is preferable that the above problem can be solved without setting the protection member. The present invention was devised as a solution to the above-mentioned problem, and the problem to be solved by the present invention is that the connecting rod is released by interference with the back of the seated occupant without setting a protective member. It is to prevent the situation where it is turned in the direction.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
According to a first aspect of the present invention, there is provided a lock device that locks a backrest angle of the seat back on both left and right side portions of the seat back, and a power transmission member for simultaneously releasing the lock state between the lock devices; The connecting rod is a vehicle seat extended in the axial direction. Each lock device is configured such that the respective lock states are released when the respective operation shafts set at positions on the coaxial lines are operated to rotate in the release operation direction. The connecting rod connects the operation shafts in a state where power can be transmitted to each other. The interference part that interferes when the back of the seated occupant of the connecting rod moves backward is configured to receive a load in a direction that causes the connecting rod to rotate in a direction opposite to the release operation direction due to the interference.

  According to the first aspect of the invention, since the interference portion of the connecting rod is configured to receive a load in a direction that causes the connecting rod to rotate in a direction opposite to the release operation direction due to the interference, the connecting rod can be It is possible to prevent a situation in which it is turned in the release operation direction due to interference with the back portion.

  According to a second invention, in the first invention described above, the interference portion of the connecting rod receives a load in a direction to rotate the connecting rod in the release operation direction due to the interference, and the release operation direction of the connecting rod due to the interference. And a shape having a non-release action portion that receives a load in the direction of rotation in the opposite direction, and a shape in which a load caused by interference is applied prior to the non-release action portion.

  According to the second aspect of the invention, the non-releasing action portion is configured to be subjected to a load caused by interference in advance, so that the shape of the interference portion causes the connecting rod to interfere with the back of the seated occupant. It is possible to prevent a situation in which it is turned in the release operation direction. Moreover, even if it has a cancellation | release action part, since said effect is acquired, a connecting rod can be set as the structure with a high freedom degree of shape setting.

  According to a third invention, in the second invention described above, the interference portion of the connecting rod interferes with the non-release action portion because the non-release action portion has a shape protruding forward of the release action portion. The load by is to be applied in advance.

  According to the third aspect of the present invention, the connecting rod is rotated in the release operation direction by the interference with the back of the seated occupant by simply forming the non-release action part forward of the release action part. Can be prevented.

  According to a fourth invention, in any one of the first to third inventions described above, the connecting rod is thicker than each operation shaft and is positioned between both side frames of the seat back in the approaching direction between the two side frames. It is comprised as a reinforcement member which prevents a deformation | transformation movement.

  According to the fourth aspect of the invention, even when the connecting rod has a thick structure that functions as a reinforcing member, a load is applied to the interference portion in a direction in which the connecting rod is rotated in a direction opposite to the release operation direction. Thus, it is possible to prevent the connecting rod from being turned in the release operation direction due to interference with the back of the seated occupant.

1 is a perspective view illustrating a schematic configuration of a vehicle seat according to Embodiment 1. FIG. It is a side view of a vehicle seat. It is the III-III sectional view taken on the line of FIG. It is a side view which shows the state which the back part of the seated passenger | crew interfered with the connecting rod by the rear part collision of the vehicle. It is a disassembled perspective view of a reclining apparatus. It is a perspective view showing the connection structure of a seat back frame and a reclining device. It is a perspective view showing the connection structure of a seat cushion frame and a reclining device. It is the VIII-VIII sectional view taken on the line of FIG. 3 showing the locked state of the reclining apparatus. It is sectional drawing showing the unlocking state of a reclining apparatus. 6 is a perspective view of a vehicle seat according to Embodiment 2. FIG. It is a side view of a vehicle seat. It is the XII-XII sectional view taken on the line of FIG. 6 is a side view of a vehicle seat according to Embodiment 3. FIG. It is a side view of the vehicle seat of Example 4.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the vehicle seat 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the vehicle seat 1 according to the present embodiment is configured as a passenger seat of a vehicle, and includes a seat back 2 serving as a backrest and a seat cushion 3 serving as a seating portion. The seat cushion 3 is installed on the floor of the vehicle, and the seat back 3 has a lower end portion on both the left and right sides of the seat cushion 3 via a reclining device 4 that functions as a rotation shaft device that can stop rotation. It is the composition connected to. Here, each reclining device 4 corresponds to a “lock device” of the present invention.

  Specifically, each reclining device 4 includes a lower end portion on both the left and right sides of the seat back frame 2f forming the skeleton of the seat back 2, a rear end portion on both the left and right sides of the seat cushion frame 3f forming the skeleton of the seat cushion 3, Between the lower end portions of the left and right sides of the seat back frame 2f and the rear end portions of the left and right sides of the seat cushion frame 3f. It is connected to become. Thus, the seat back 2 is connected to the seat cushion 3 in a state where the backrest angle can be adjusted in the front-rear direction of the seat. Each of the reclining devices 4 can be switched between a state in which the backrest angle of the seat back 2 can be changed (unlocked state) and a locked state by a rotation stop structure (lock structure) provided therein. It has become.

  Specifically, each of the reclining devices 4 can be switched to a locked / unlocked state in accordance with a shaft rotation operation of each operation shaft 4c inserted through the center portion thereof, and each operation shaft 4c. Are integrally connected to each other by the connecting rod 7 so that the locking / unlocking switching operations are performed simultaneously in synchronism with the left and right. Each of the reclining devices 4 is normally held in an operating state locked by a spring urging structure, which will be described later, and is held in a state in which the backrest angle of the seat back 2 is fixed.

  The fixed state of the backrest angle of the seat back 2 is such that the operation shafts 4c are simultaneously rotated by an operation of pulling up the operation lever 5 provided on the side of the seat cushion 3 on the vehicle outer side (right side in FIG. 1). It is to be released when operated. By this releasing operation, the seat back 2 can be freely adjusted in its backrest angle. Further, by stopping the release operation, the reclining devices 4 are again returned to the locked state by the spring biasing structure, and the backrest angle of the seat back 2 is returned to the fixed state.

  Here, between the left and right side portions of the seat back frame 2f and the left and right side portions of the seat cushion frame 3f, spiral springs 6 that constantly urge the seat back 2 to rotate forward are seated. It is worn. As shown in FIG. 1, these spiral springs 6 are hooked on a cut-and-raised plate 3d formed by cutting and raising the inner ends (inner ends 6a) of the left and right outer side portions of the seat cushion frame 3f. The outer end portion (outer end 6b) is attached to the rear edge portion of the plate portion that projects to both outer sides of the L-shaped plate 2d coupled to the left and right outer side portions of the seat back frame 2f. Each is hooked and fixed. The seat back 2 is lifted up to a position where the seat back 2 hits the back of the seat occupant by releasing the fixed state of the backrest angle by the urging force of the spiral spring 6, and the back of the seat occupant is tilted back and forth. The backrest angle position can be freely changed following this.

  When the seat back 2 described above is in the angle region of the rearward tilt posture in which the backrest angle position is tilted to the rear side of the seat from the position where the seat back is vertically raised, the operation of the operation lever 5 described above is stopped. The backrest angle is returned to the fixed state (locked state), but even if the operation of the operation lever 5 is stopped by entering the angle region of the forward leaning posture tilted forward from the standing position to the seat front side. The backrest angle is not fixed.

  The angle region in which the former backrest angle is returned to the fixed state is formed by the rotation region of the lock zone set in each reclining device 4 to be described later, and the angle region in which the latter backrest angle is not returned to the fixed state is These are formed by a free zone rotation region set in each reclining device 4 to be described later. By setting the free zone, the operating lever 5 is operated in a state where no person is sitting on the vehicle seat 1, and the seat back 2 is pushed down to the front side of the seat by the urging force of the spiral spring 6. Sometimes, when the seat back 2 is pushed down to a position exceeding the above-mentioned standing position, the seat back 2 is greatly moved forward to the position where the seat back 2 is folded into the upper surface of the seat cushion 3 even if the operation lever 5 is released. It is supposed to be defeated.

  By the way, as shown in FIG. 1, the connecting rod 7 described above is formed of a circular steel pipe, and the left and right ends thereof are integrally fitted in the respective operation shafts 4c in the axial direction. It is the structure connected by welding. Specifically, as shown in FIGS. 1 and 3, each end portion of the connecting rod 7 described above is axially extended from a disk-like flange portion 4 c 1 formed at the inner end portion of each operation shaft 4 c in the axial direction. As a state of being fitted into each of the column-shaped heads 4c2 protruding in the direction of being pressed against the flanges 4c1 in the axial direction, the flanges 4c1 are integrally coupled by welding. As a result, the connecting rod 7 is in a state in which the respective end portions and the respective operation shafts 4c are firmly and integrally coupled to each other, and the respective operation shafts 4c are connected to each other in a state where power can be transmitted to each other. Yes.

  The connecting rod 7 described above has a larger diameter than the operation shafts 4c, and is positioned between the side frames of the seat back frame 2f, which will be described later. The frame functions as a reinforcing member that prevents deformation movement that is crushed toward the side frame inside the vehicle.

  The connecting rod 7 is always in an initial rotational position state in which each operation shaft 4c locks each reclining device 4 by urging before the operation lever 5 described above with reference to FIG. Stopped and held. In this state, both the operation shaft 4c and the connecting rod 7 can rotate in the direction of rotation by rotating the operation lever 5 (clockwise direction in FIG. 3), but in the opposite direction, the lock It is in a state where it cannot rotate due to regulation by Therefore, the connecting rod 7 transmits, to the other operation shaft 4c, the movement of turning the operation shaft 4c on the side where the operation lever 5 is set when the operation lever 5 is pulled up. Thus, the locked state of the reclining devices 4 on both sides is released simultaneously.

  In this case, the connecting rod 7 described above is normally attached to the back of the seated occupant by a cushion pad (not shown) interposed between the seat back 2 and the back of the seated occupant. It is in a state of being protected so that it does not come into direct contact with. However, even in the above-described configuration, as shown in FIG. 4, when a heavy load is applied such that the back of the vehicle occupies the seat back 2 due to a rear collision of the vehicle, The connecting rod 7 may be subjected to a pressing force accompanying a backward movement from the back (waist) of the seated occupant.

  This pressing force is applied mainly by interference with the lower back as the entire back of the seated occupant sinks into the seat back 2, but the back of the seated occupant sinks backward. Along with this, the connecting rod 7 is not simply pressed rearward, but exerts an acting force that rubs the outer peripheral surface (front surface) of the connecting rod 7 upward. The force with which the outer peripheral surface (front surface) of the connecting rod 7 is rubbed upward becomes a force that causes the connecting rod 7 to rotate in the release operation direction, and this force causes the connecting rod 7 to rotate in the release operation direction. As a result, the locked state of each reclining device 4 is released.

  However, the connecting rod 7 of the present embodiment is configured not to rotate in the release operation direction even when subjected to the action of the pressing force as described above, and can keep each reclining device 4 in the locked state. Yes. Specifically, the connecting rod 7 has an interfering portion 7a that interferes with the back when the seated occupant's back moves backward, in a half-moon shape with an annular cross-section from the front obliquely upper side to the rear obliquely lower side. It is formed into a concave cross-sectional shape. As a result, the interference portion 7a has an upper shape portion 7a1 located in a region above the axial center 4r of each operation shaft 4c, than a lower shape portion 7a2 located in a region below the shaft center 4r. Has a shape retracted to the rear side, and the load caused by the interference with the back of the seated occupant precedes the lower shape portion 7a2 (is strongly received before the upper shape portion 7a1). ing. As shown in FIG. 1, the interference portion 7 a is set over a wide area that is a major portion in the axial direction excluding a portion that is fitted to the head 4 c 2 of each operation shaft 4 c of the connecting rod 7. .

  Since the lower shape portion 7a2 described above is a shape portion located below the axis center 4r of each operation shaft 4c described above, the connecting rod 7 is subjected to a load accompanying the backward movement from the back of the seated occupant. Is subjected to a load action so as to be rotated in a direction opposite to the release operation direction described above (counterclockwise direction in the drawing). On the other hand, since the upper shape portion 7a1 is a shape portion located above the above-described shaft center 4r, when receiving a load accompanying the backward movement from the back of the seated occupant, the connecting rod 7 is released in the release operation direction (clockwise in the figure). It receives a load action to rotate in the direction. Here, the lower shape portion 7a2 corresponds to the “non-release action portion” of the present invention, and the upper shape portion 7a1 corresponds to the “release action portion” of the present invention.

  Thus, the interference portion 7a of the connecting rod 7 has a shape in which the lower shape portion 7a2 protrudes to the front side rather than the upper shape portion 7a1, so that at the time of interference, the most front side of the lower shape portion 7a2 A pressing force toward the rear side is strongly applied in advance to the interference point P that is a portion protruding in the direction of the point. Therefore, even if a force that rubs the connecting rod 7 upward is applied to this part (interference point P), the force that presses the lower shape portion 7a2 backward acts more strongly than this force. Therefore, the connecting rod 7 is maintained in the initial rotational position without being rotated in the release operation direction.

  More specifically, in the present embodiment, the interference portion 7a described above has an oblique half-moon shaped cross-sectional shape in which an annular cross-section is recessed from the front oblique upper side to the rear oblique lower side, The interference point P that interferes with the back of the seated occupant (the portion that protrudes most forward) is lowered to a position lower than the axial center 4r of each operation shaft 4c. Since the interference point P is set at a position lower than the shaft center 4r in this way, a pressing force is applied to the interference point P in the backward direction, so that the connecting rod 7 is rotated in the counterclockwise direction shown in FIG. A large rotational torque in the direction opposite to the direction) can be applied.

  Further, since the interference point P is set at a position lower than the shaft center 4r, a force that rubs upward (releasing operation direction) is applied to the interference point P as described above, and the connecting rod 7 is rotated in the clockwise direction in the figure. In order to rotate in the (releasing operation direction), the interference point P must first take its movement locus obliquely upward and forward. Therefore, the interference point P is in a state in which it is difficult to rotate in the clockwise direction (the release operation direction) in the state under the pressure applied to the rear side as described above. For the above reasons, the connecting rod 7 is not rubbed and rotated in the opposite direction of rotation even when a load is applied to the interference portion 7a from the back of the seated occupant due to the rear collision of the vehicle. As a state where the pressing force is received, the rotation is stopped. Specifically, in the present embodiment, the interference portion 7a has an oblique half-moon-like cross-sectional shape in which an annular cross-section is recessed from the front oblique upper side to the rear oblique lower side. Is effectively lowered below the shaft center 4r, and the upper shape portion 7a1 is retracted to the rear side from the shaft center 4r. Is applied in a concentrated and effective manner, and the rotational torque due to the interference point P being rubbed upward is effectively reduced.

  For reference, when the above-described interference portion 7a of the connecting rod 7 is not in a half-moon-shaped shape as described above, but in an annular shape (see the virtual line shape in FIG. 4). ), The position of the interference point P that hits the back of the seated occupant is set to a position that is substantially the same height as the axial center 4r of each operation shaft 4c. Therefore, in this case, even if a backward pressing force is applied to the interference point P, the connecting rod 7 does not receive a force for rotating in either direction (or a small amount even if received). Therefore, the connecting rod 7 is easily rotated in the same direction (releasing operation direction) by applying a force in the upward rubbing direction to the interference point P.

  Hereinafter, the configuration of each reclining device 4 described above will be described in detail. Since each reclining device 4 has the same configuration that is bilaterally symmetric, in the following, as a representative of these, the reclining device 4 of the reclining device 4 that is arranged on the right side of the paper surface of FIG. Only the configuration will be described. As shown in FIG. 5, the reclining device 4 includes a disk-shaped ratchet 10 and guide 20, two poles 30, a slide cam 40, a hinge cam 50, a spiral spring 60, and an outer ring 70. These are assembled together in the axial direction.

  In the ratchet 10, a cylindrical portion 12 that protrudes in a cylindrical shape in the plate thickness direction (axial direction), which is an assembly direction to the guide 20, is formed on the outer peripheral portion of the disk portion 11. The cylindrical portion 12 is formed by being extruded by half-cutting the outer peripheral portion of the disc portion 11 in the plate thickness direction. The inner circumferential surface of the cylindrical portion 12 has an inner circumferential tooth surface 12a having inner teeth that can mesh with outer circumferential tooth surfaces 30a of the respective poles 30 described later, and a smooth arc surface with no inner teeth. The protruding riding surface 12b is formed side by side in the circumferential direction. The ride-up surface 12b is formed at one position on the inner peripheral surface of the cylindrical portion 12 in the circumferential direction, and the inner peripheral surface is on the inner side in the radial direction than the tooth tip of the inner peripheral tooth surface 12a. It is formed as a protruding arc surface.

  As shown in FIG. 6, the ratchet 10 has an outer disk surface of the disk portion 11 joined to an outer plate surface of the seat back frame 2f and integrally coupled thereto. Specifically, the disc portion 11 of the ratchet 10 is formed with five dowels 13a (... indicates a plurality) and one D dowel 13b projecting in a cylindrical shape from the outer disc surface. . These dowels 13a... And D dowels 13b are arranged and formed at equal intervals in the circumferential direction at positions relatively close to the outer peripheral edge side of the disk portion 11. Among these, the D dowel 13b is formed in a shape in which a part of the protruding cylindrical shape is cut out in a D-shaped cross section so that the shape can be distinguished from each dowel 13a. It has become.

  On the other hand, in the seat back frame 2f, the above-mentioned dowels 13a, .. and D dowels 13b can be respectively fitted in the axial direction. Is formed. As a result, the ratchet 10 fits the dowels 13a... And D dowels 13b into the respective dowel holes 2a... And D dowel holes 2b formed in the seat back frame 2f. By being welded and joined to each other, the seat back frame 2f is firmly and integrally joined. Here, as shown in FIG. 5, the operation shaft 4 c (see FIG. 3) for performing the lock / unlock switching operation of the reclining device 4 is inserted into the central portion of the disk portion 11 of the ratchet 10 described above. For this purpose, a through hole 14 is formed. As shown in FIG. 6, a through hole 2c having the same purpose is formed through the seat back frame 2f at a position coaxial with the through hole 14.

  Next, the configuration of the guide 20 will be described with reference to FIG. The guide 20 is formed in a disk shape having an outer diameter slightly larger than that of the ratchet 10 described above, and a plate thickness direction (axial direction) that is an assembling direction to the ratchet 10 is formed on the outer peripheral portion of the disk portion 21. A cylindrical portion 22 protruding in a cylindrical shape is formed. The cylindrical portion 22 is formed by being extruded by half-cutting the outer peripheral portion of the disc portion 21 in the plate thickness direction. The inner diameter of the cylindrical portion 22 is slightly larger than the outer diameter of the cylindrical portion 12 of the ratchet 10, and as shown in FIG. 3, the cylindrical portion 12 of the ratchet 10 is fitted in the inside of the cylinder in the axial direction. As a result of the assembly, the cylindrical portions 12 are loosely fitted in and out of each other, and the ratchet 10 and the guide 20 are assembled in a state of supporting each other so that they can rotate relative to each other. ing.

  Guide walls 21 a, 21 b, 21 c, 21 d (hereinafter referred to as guide walls 21 a to 21 b) projecting in the plate thickness direction as the assembly direction to the ratchet 10 are arranged at four positions on the disk portion 21 of the guide 20 in the circumferential direction. 21d) is formed. These guide walls 21a to 21d are formed by being extruded by partially punching part of the disk portion 21 in the plate thickness direction. As shown in FIGS. 8 to 9, these guide walls 21 a to 21 d can move the poles 30 set at two positions on the disk portion 21 described later only inward and outward in the radial direction. The slide cam 40 set in the center of the disk portion 21 is supported so as to be movable only in the radial direction perpendicular to the slide direction of the poles 30. It is the structure which supports to direction.

  As shown in FIG. 7, the outer surface of the disk portion 21 of the guide 20 is joined to the inner surface of the seat cushion frame 3 f so as to be integrally coupled. Specifically, the disc portion 21 of the guide 20 is formed with three dowels 24a... Projecting in a cylindrical shape from the outer surface of the guide 20 and one D dowel 24b. These dowels 24a,... And D dowels 24b are formed one by one on the outer surface of the guide groove 23 formed in the shape of a "ten" sign projecting on the outer surface of the disk portion 21, which will be described later. Thus, they are formed in a state of being arranged at equal intervals in the circumferential direction. Among them, the D dowel 24b is formed in a shape in which a part of the protruding cylindrical shape is cut out in a D-shaped cross section so that the shape can be distinguished from each of the dowels 24a. It has become. Further, two spring hook portions 24c are formed on the outer surface of the guide 20 so as to protrude into a pin shape for hooking an outer end 62 of a spiral spring 60 described later. The two spring hooks 24c are formed so that the same configuration can be applied to the reclining device 4 on the other side where the spiral spring 60 is hooked in the opposite direction.

  On the other hand, the dowel holes 3a and D dowel holes 3b through which the above-described dowels 24a and D dowels 24b can be fitted in the axial direction are formed through the cushion frame 3f in the thickness direction. Has been. Thereby, the above-described guide 20 fits the dowels 24a... And the D dowels 24b into the dowel holes 3a... And the D dowel holes 3b formed in the cushion frame 3f. By being welded and joined to each other, the cushion frame 3f is firmly and integrally joined. Here, as shown in FIG. 5, the operation shaft 4 c (see FIG. 3) for performing the switching operation of the reclining device 4 is inserted into the center portion of the disk portion 21 of the guide 20 described above. For this purpose, a through hole 25 is formed. The seat cushion frame 3f is also formed with a through hole 3c having the same purpose passing through at a position coaxial with the through hole 25. The through-hole 3c is formed so as to open to a size that allows a spiral spring 60 (described later) to pass through the cut-and-raised plate 3d. A lid member 3g that covers the through hole 3c from the outside is provided on the plate surface portion outside the through hole 3c.

  Referring to FIG. 5, a guide groove 23 is formed in the disk portion 21 of the guide 20 described above on the inner surface of the guide 20 so as to be recessed in a “ten” sign shape in the plate thickness direction. The guide groove 23 is formed by half-cutting the disk portion 21 into a “ten” symbol shape in the plate thickness direction, and the four corners of the portion where the groove shape crosses, that is, between the grooves projecting in the radial direction. In the region portion, the above-described guide walls 21a to 21d are formed so as to protrude in a standing wall shape in the plate thickness direction. Of the groove shape recessed in the “ten” symbol shape, the guide groove 23 described above has two groove portions extending from the center portion of the guide 20 to the upper side and the lower side in the figure, respectively. Each of them is formed as a pole groove 23a that can be accommodated therein so as to be movable inward and outward in the radial direction.

  Similarly, of the groove shape of the guide groove 23 recessed in a “ten” symbol shape, a groove portion formed by communicating the center portion of the guide 20 with two groove portions extending in the horizontal direction in the drawing is a slide described later. The cam 40 is formed as a cam groove 23b that can be accommodated therein so as to be movable in the horizontal direction (radial direction) in the figure. The guide walls 21a to 21d described above are respectively assigned to the side surfaces of the poles 30 accommodated in the pole grooves 23a and the side surfaces of the slide cams 40 accommodated in the cam grooves 23b. The pole 30 and the slide cam 40 are each guided so as to be movable only in a specific radial direction.

  Next, the configuration of each pole 30 described above will be described with reference to FIG. Each pole 30 is set in each pole groove 23a formed in the guide 20 described above, so that it can move only inward and outward in the radial direction along the shape in each pole groove 23a. It is arrange | positioned as the state supported in the direction. Each of the poles 30 is formed as an outer peripheral tooth surface 30a having curved outer teeth so that the outer peripheral surface thereof can mesh with the inner peripheral tooth surface 12a of the cylindrical portion 12 of the ratchet 10 described above. Is formed.

  As shown in FIG. 8, each of the poles 30 is pushed outward in the radial direction by a slide operation of a slide cam 40 to be described later, so that the outer peripheral tooth surfaces 30 a are the inner peripheral tooth surfaces of the cylindrical portion 12 of the ratchet 10. 12a is engaged. As a result, each pole 30 is integrally pressed in the rotational direction (circumferential direction) with respect to the ratchet 10 as being pressed against the inner peripheral tooth surface 12a of the ratchet 10 by the pressing force of the slide cam 40. It is held in a state.

  Each of the poles 30 can slide only inward and outward in the radial direction by the support in the circumferential direction by the guide walls 21a to 21d described above in relation to the guide 20. Accordingly, the ratchet 10 is in a state in which the respective poles 30 are engaged with each other, so that the ratchet 10 is integrated with the guide 20 through the poles 30 in the rotational direction, that is, the rotation with respect to the guide 20 is locked. Is held. As a result, the reclining device 4 is rotationally locked. Here, the structure in which the pawls 30 are engaged with the ratchet 10 to lock the rotation corresponds to the “lock mechanism” of the present invention.

  As shown in FIG. 9, the rotation lock state of the reclining device 4 is removed from the meshed state with the ratchet 10 when the slide cam 40 is slid in the right direction in the drawing and each pole 30 is drawn inward in the radial direction. It is to be canceled by being done. Here, as shown in FIG. 5, the above-described operations for pushing each of the poles 30 outward in the radial direction by the sliding motion of the slide cam 40 and pulling them inward in the radial direction are performed on the peripheral edges on the upper and lower sides of the slide cam 40. This is performed by the shoulders 42 and hooks 44 formed in the part.

  Specifically, as shown in FIG. 8, each of the shoulder portions 42 is configured so that the slide cam 40 slides in the left direction in the drawing (sliding movement from the state of FIG. 9 to the state of FIG. 8). Each leg 32 is pushed up from the inside in the radial direction to the outside so as to ride on each leg 32, and each pole 30 is engaged with the inner peripheral tooth surface 12 a of the ratchet 10. Further, the hook 44 is formed in an arm shape so as to bend in the right direction in the figure from the upper and lower outer peripheral portions of the slide cam 40, and the slide cam 40 slides in the right direction in the figure (see FIG. (Sliding movement from the state of 8 to the state of FIG. 9), it is hooked on each hooking portion 31 formed on the inner peripheral portion of each pole 30, and pulls each pole 30 inward in the radial direction. Each of the poles 30 is removed from the meshed state with the inner peripheral tooth surface 12a of the ratchet 10. Here, the movement of the respective poles 30 inward in the radial direction is allowed by the structure in which the leg portions 32 enter into the respective groove portions 43 formed in the periphery of the upper and lower sides of the slide cam 40. It has become.

  As shown in FIG. 8, the slide cam 40 is normally moved and urged to the left in the drawing via a hinge cam 50 mounted in the through hole 41 at the center thereof, and each pole 30 is moved. Pressed from the inner side in the radial direction and pressed against the inner peripheral tooth surface 12a of the ratchet 10 to be held in mesh. Then, as shown in FIG. 9, the slide cam 40 is pushed rightward in the figure by rotating the hinge cam 50 in the clockwise direction in the figure against the urging force, so that each pole 30 is moved. It is drawn inward in the radial direction and removed from the meshed state with the ratchet 10.

  By the way, when each of the above-described poles 30 is in a state where the rotation position of the ratchet 10 with respect to the guide 20 is in a state where the riding surface 12b is located at the position to which any of the poles 30 is moved, the locking movement is performed. It is blocked by climbing onto the door and cannot be locked. Specifically, when any one of the above-mentioned poles 30 rides on the riding surface 12b, the movement of the slide cam 40 that applies a pressing force in the pushing direction to each pole 30 is stopped. Thereby, the locking operation of the other pole 30 is also stopped, and the reclining device 4 is kept in the unlocked state. As described above, in the rotation angle region where the above-described riding surface 12b interferes with any one of the poles 30, the locking operation of the reclining device 4 is prevented, and the reclining device 4 is kept in the unlocked state. This rotation angle region is set as the rotation angle region constituting the above-described free zone. Further, the reclining device 4 is returned to the locked state in the rotation angle region in which each of the poles 30 can mesh with the inner peripheral tooth surface 12a of the ratchet 10 without the riding surface 12b interfering with any of the poles 30. It is set as a lock zone.

  Next, the configuration of the hinge cam 50 that rotates the slide cam 40 described above will be described with reference to FIG. The hinge cam 50 is inserted into a through-hole 25 formed in the central portion of the guide 20 described above and is rotatably supported so as to protrude in the axial direction of the shaft portion and the outer peripheral portion of the shaft portion. The formed operation protrusion 52 is set in a state of being fitted into a through hole 41 formed through the central portion of the slide cam 40. Specifically, the hinge cam 50 is set in a state in which the operation projection 52 is inserted into the operation hole 41 a that is formed in a part of the peripheral edge in the through hole 41 of the slide cam 40.

  The hinge cam 50 is normally urged to rotate in the clockwise direction with respect to the guide 20 in FIG. 5 by the urging force of the spiral spring 60 hooked between the hinge cam 50 and the guide 20. Yes. As a result, the hinge cam 50 normally applies a rotational biasing force in the same direction (clockwise direction toward the paper surface of FIG. 5) to the slide cam 40 via the operation projection 52. As shown in FIG. 7, the spiral spring 60 is twisted in advance, and an inner end 61 thereof is hooked on a spring hook portion 51 formed in a rectangular tube shape of the hinge cam 50, and an outer end 62. Is provided by being hooked to the spring hooking portion 24c of the guide 20. The operation shaft 4c described above with reference to FIG. 5 is inserted into the hinge cam 50 in the axial direction and is integrally mounted in the rotational direction. Accordingly, the hinge cam 50 is rotated in the counterclockwise direction shown in FIG. 5 against the urging force of the spiral spring 60 shown in FIG. 5 when the operation lever 5 described above with reference to FIG. 1 is pulled up. It has become.

  Next, the configuration of the outer peripheral ring 70 will be described with reference to FIG. The outer peripheral ring 70 has a surface oriented in the axial direction by punching a thin steel plate into a ring shape and further punching the punched disc portion into a step shape in the plate thickness direction (axial direction). The ring-shaped first seat surface portion 71 and the second seat surface portion 72 are formed in a cylindrical shape with a seat, which is formed side by side in steps in the axial direction. A cylindrical portion 73 protruding in a cylindrical shape in the axial direction is formed on the outer peripheral portion of the outer peripheral ring 70.

  The outer peripheral ring 70 has the ratchet 10 and the guide 20 assembled in order inside the cylinder, so that the cylindrical portion 12 of the ratchet 10 is assigned from the outside in the axial direction by the first seat surface portion 71 described above. The cylindrical portion 22 of the guide 20 is covered with the cylindrical portion 73 from the outer peripheral side, with the cylindrical portion 22 of the guide 20 being applied from the inner side in the axial direction by the two seating surface portions 72. Then, after the assembly, the tip of the cylindrical portion 73 (caulking portion 73a) that protrudes outward in the axial direction from the cylindrical portion 22 of the guide 20 of the outer peripheral ring 70 is bent inward in the radial direction, so that the second seat surface portion 72 is obtained. The outer peripheral ring 70 is assembled in a state of being integrally coupled to the cylindrical portion 22 of the guide 20 by caulking the cylindrical portion 22 of the guide 20 in the axial direction therebetween. By this assembly, the outer peripheral ring 70 is in a state in which the ratchet 10 and the guide 20 are assembled in the axial direction, with the first seat surface portion 71 holding the ratchet 10 so as not to be detached from the guide 20 in the axial direction. It comes to hold.

  Thus, according to the configuration of the vehicle seat 1 of this embodiment, the interference portion 7a of the connecting rod 7 rotates the connecting rod 7 in the direction opposite to the release operation direction due to interference with the back of the seated occupant. By being configured to receive the load, it is possible to prevent the connecting rod 7 from being turned in the release operation direction due to interference with the back of the seated occupant. Further, the interference part 7a of the connecting rod 7 releases not only the lower shape part 7a2 (non-release action part) that receives a load in a direction in which the connecting rod 7 is rotated in the direction opposite to the release operation direction, but also the connecting rod 7 Even if the upper shape part 7a1 (release action part) rotated in the operation direction has a large cross-sectional shape, the connecting rod 7 has a reinforcing function because it is not rotated in the release operation direction. A configuration having a high degree of freedom in shape setting, such as a thicker one, can be achieved.

  Then, the structure of the vehicle seat 1 of Example 2 is demonstrated using FIGS. In addition, in a present Example, about the location which becomes the substantially same structure and effect | action as the vehicle seat 1 shown in Example 1, the same code | symbol is attached | subjected to these, description is abbreviate | omitted, and a different structure is explained in detail. I will explain. In this embodiment, as shown in each drawing, the connecting rod 7 is formed of a straight circular steel pipe, and the shaft center 7r of each operation shaft 4c is the shaft center 4r of each operation shaft 4c. It is set as the state couple | bonded with the state used as the positional relationship eccentrically to the back lower side rather than.

  Specifically, as shown in FIGS. 10 to 12, each disk-shaped flange portion 4 c 1 formed at the inner end portion in the axial direction of each operation shaft 4 c has a rear lower side with respect to each operation shaft 4 c. The connecting rod 7 is formed in a position eccentric to the side, and each end of the connecting rod 7 is fitted in the head direction 4c2 protruding in a columnar shape from the flange portion 4c1 in the axial direction so as to be integrally connected. 7 is in a state of being attached at a position eccentric to the rear lower side with respect to each operation shaft 4c.

  Specifically, the interference portion 7a of the connecting rod 7 is formed in an upper shape portion 7a1 (release action portion) located in a region above the shaft center 4r of each operation shaft 4c and in a region below the shaft center 4r. An interference point P, which is an arrangement state having a lower shape portion 7a2 (non-releasing action portion) located, and which projects to the most front side and interferes with the back of the seated occupant is the axis center of each operation shaft 4c It is set at a position lower than 4r. Further, the interference portion 7a of the connecting rod 7 is in an arrangement state in which the upper shape portion 7a1 is retracted rearward from the lower shape portion 7a2, and the load due to interference with the back of the seated occupant is lower. The arrangement state is such that it precedes the portion 7a2 (it is strongly received before the upper shape portion 7a1). Thereby, the connecting rod 7 is configured to receive a load in a direction of rotating in the direction opposite to the release operation direction due to interference with the back of the seated occupant. In the present embodiment, since the connecting rod 7 is formed of a straight circular steel pipe having a uniform cross section, the entire structure corresponds to the “interference portion” of the present invention.

  Thus, the connecting rod 7 is attached to the position shifted rearward and downward with respect to each operation shaft 4c, so that when the connecting rod 7 interferes with the back of the seated occupant, the direction opposite to the release operation direction. It can be set as the structure which receives a load in the direction to rotate in the direction. Further, the interference part 7a of the connecting rod 7 releases not only the lower shape part 7a2 (non-release action part) that receives a load in a direction in which the connecting rod 7 is rotated in the direction opposite to the release operation direction, but also the connecting rod 7 Since the upper shape portion 7a1 (release action portion) that receives a load in the direction of rotation in the operation direction is also left, even in a slightly eccentric arrangement state, it is configured not to be rotated in the release operation direction. For example, the connecting rod 7 can be of a large diameter having a reinforcing function, so that the configuration can be set with a high degree of freedom. In this embodiment, the configuration in which the setting position of the connecting rod 7 is set so that the shaft center 7r of the connecting rod 7 is decentered rearwardly and downwardly with respect to the shaft center 4r of each operation shaft 4c is exemplified. A similar configuration can be obtained by simply decentering downward.

  Then, the structure of the vehicle seat 1 of Example 3 is demonstrated using FIG. In addition, in a present Example, about the location which becomes the substantially same structure and effect | action as the vehicle seat 1 shown in Example 1, the same code | symbol is attached | subjected to these, description is abbreviate | omitted, and a different structure is explained in detail. I will explain. In the present embodiment, the connecting rod 7 is formed of a straight circular steel pipe, and a projecting member 7b that protrudes forward from the connecting rod 7 at the front lower portion of the interference portion 7a that interferes with the back of the seated occupant. Is configured to be integrally attached. By this projecting member 7b, the interference point P that is the most protruding portion that interferes with the back of the seated occupant is set at a position lower than the axial center 4r of each operation shaft 4c. In this way, with a simple configuration in which another member is attached to the connecting rod 7, the connecting rod 7 is configured to receive a load in a direction that rotates in a direction opposite to the release operation direction when the connecting rod 7 interferes with the back of the seated occupant. Can do.

  Then, the structure of the vehicle seat 1 of Example 4 is demonstrated using FIG. In addition, in a present Example, about the location which becomes the substantially same structure and effect | action as the vehicle seat 1 shown in Example 1, the same code | symbol is attached | subjected to these, description is abbreviate | omitted, and a different structure is explained in detail. I will explain. In the present embodiment, the connecting rod 7 is formed by a plate-shaped member having a cross-sectional surface facing obliquely upward on the front side of the seat. Thereby, the interference point P, which is the most protruding portion that interferes with the back of the seated occupant, is set at a position lower than the axial center 4r of each operation shaft 4c. As described above, the connecting rod 7 is formed of a member having a cross-sectional plate shape facing obliquely upward in front of the seat, and thus the connecting rod 7 rotates in the direction opposite to the release operation direction when it interferes with the back of the seated occupant. It can be set as the structure which receives load in a direction.

  As mentioned above, although embodiment of this invention was described using the four Examples, this invention can be implemented with various forms other than the said Example. For example, the connecting rod 7 does not have to have a large-diameter structure that functions as a reinforcing member as shown in the above-described embodiment, and simply connects the operating shafts in a state where power can be transmitted between them. It may be of a small diameter with strength. In addition, the shape of the interference portion that receives the load action in the non-releasing action direction of the connecting rod may be formed at least in the center portion in the seat width direction that interferes when the back of the seated occupant moves backward. It does not need to be widely formed over both side portions in the direction. In addition, the shape of the surface of the interference portion that interferes with the back of the seated occupant, including those shown in the above embodiments, may be various shapes such as a curved shape and a flat shape. Can do.

  In each of the above embodiments, the release operation direction of the connecting rod 7 is set as the direction in which the operation lever 5 is pulled up. However, the direction in which the operation lever 5 is pushed down is the release operation direction. The configuration of the present invention can also be applied. Specifically, the structure of the connecting rod shown in each of the above embodiments is arranged in the upside down direction, so that an erroneous operation preventing structure can be configured when the release operation direction is reversed. In this case, the connecting rod is applied even if an acting force such that the back of the seated occupant interferes with the interference portion of the connecting rod and is rubbed upward by the occurrence of a rear collision of the vehicle. Is not rotated in the release operation direction, but when the back of the seated occupant moves backward due to some action, the rear side is accompanied by a downward rubbing force that is pushed by the connecting rod in the release operation direction. When the pressing force is applied to the connecting rod, it is possible to prevent the connecting rod from being turned in the releasing operation direction.

  Further, in each of the above-described embodiments, the interference portion 7a of the connecting rod 7 is located on the upper side of the upper shape portion 7a1 (release action portion) positioned above the axial center 4r of each operation shaft 4c and below the axial center 4r. An example is shown in which the lower shape portion 7a2 (non-release action portion) is positioned, but the interference portion is greatly recessed or decentered so that the upper shape portion (release action portion) does not remain. It may be set to a different position.

  Further, in each of the above embodiments, the reclining device 4 that functions as a rotation shaft device that can be prevented from rotating is illustrated as a locking device that fixes the backrest angle of the seat back 2. However, the rotation that pivotally supports the seat back is supported. The shaft portion and the locking device that locks the backrest angle of the seat back may be configured separately. Further, the connecting rod may be provided between the locking devices so as to function so as to release these locked states all at once, and is inserted into each reclining device 4 as shown in the above embodiments. In addition to the configuration in which the set operation shafts 4c are connected to each other, the connecting rod is directly connected to the rotary shaft member set in each lock device, and the lock state of each lock device is simultaneously released. It may function as follows. In this case, the rotation shaft member in each lock device corresponds to the “operation shaft” of the present invention. Moreover, although the configuration in which the seat back 2 is connected to and supported by the seat cushion 3 is illustrated, the seat back may be connected to and supported by the floor.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2f Seat back frame 2a Dowel hole 2b D Dowel hole 2c Through hole 2d L-shaped plate 3 Seat cushion 3f Seat cushion frame 3a Dowel hole 3b D Dowel hole 3c Through hole 3d Cut and raise plate 3g Cover member 4 Reclining device (lock device)
4c Operation shaft 4c1 Flange 4c2 Head 4r Shaft center 5 Operation lever 6 Spiral spring 6a Inner end 6b Outer end 7 Connecting rod 7a Interference part 7a1 Upper shape part (release action part)
7a2 Lower shape part (non-release action part)
7b Projection member 7r Axis center 10 Ratchet 11 Disk part 12 Cylindrical part 12a Inner peripheral tooth surface 12b Raised surface 13a Dowel 13b D Dowel 14 Through hole 20 Guide 21 Disk part 21a-21d Guide wall 22 Cylindrical part 23 Guide groove 23a Pole groove 23b Cam groove 24a Dowel 24b D Dowel 24c Spring hook portion 25 Through hole 30 Pole 30a Outer peripheral tooth surface 31 Hook portion 32 Leg portion 40 Slide cam 41 Through hole 41a Operation hole portion 42 Shoulder portion 43 Groove portion 44 Hook 50 Hinge cam 51 Spring hook portion 52 Operation protrusion 60 Spiral spring 61 Inner end 62 Outer end 70 Outer peripheral ring 71 First seat surface portion 72 Second seat surface portion 73 Cylindrical portion 73a Caulking portion 74 Stepped portion P Interference point

Claims (4)

Locking devices for locking the backrest angle of the seat back are provided on both right and left sides of the seat back, and connecting rods serving as power transmission members for simultaneously releasing the lock state between the lock devices are provided. A vehicle seat extending in an axial direction,
Each of the locking devices is configured such that the respective locked states are released by rotating the operation shafts set in positions on the coaxial lines in the release operation direction.
The connecting rod connects the operation shafts in a state in which power can be transmitted to each other.
The interference part that interferes when the back of the seated occupant of the connecting rod has moved backward is configured to receive a load in a direction that rotates the connecting rod in a direction opposite to the release operation direction due to interference ,
An arrangement in which the interference part is brought close to the back part of the seated occupant moving backward so that the axial center of each operation shaft is located in the inner region of the cross-section of the connecting rod cut by the interference part; A vehicle seat characterized by being made . The vehicle seat according to claim 1,
The interference portion of the connecting rod includes a release action portion that receives a load in a direction that rotates the connecting rod in a release operation direction due to interference, and a load that rotates the connecting rod in a direction opposite to the release operation direction due to interference. And a non-releasing action part for receiving the vehicle seat, wherein the load due to interference is in a shape prior to the non-releasing action part. The vehicle seat according to claim 2,
The interference part of the connecting rod has a shape in which the non-release action part protrudes forward of the release action part, so that a load due to interference is applied to the non-release action part in advance. A vehicle seat characterized by being made. The vehicle seat according to any one of claims 1 to 3,
The connecting rod is thicker than each operation shaft, and is configured as a reinforcing member that is located between both side frames of the seat back and prevents deformation movement in the approaching direction between the side frames. Vehicle seat to be used.

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