JP3903661B2 - Folding sheet rotation lock structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a folding lock mechanism for folding seats that can be folded and stored, for example, used in automobile seats.
[0002]
[Prior art]
The folding seat is used for, for example, a rear seat or a third seat of an automobile, and the luggage space can be expanded by folding. As shown in FIG. 10A, the folding seat 91 includes a seat back 92, a seat cushion 93, and a seat rotating portion 94. The seat rotation portion 94 is attached to the front of the seat cushion 93 (on the left side in the figure), and the folding seat 91 is fixed to the vehicle body floor 99 via this. When the folding seat 91 is folded, as shown in FIG. 5B, after the seat back 92 is tilted forward and overlaid on the seat cushion 93, the entire folding seat 91 is raised forward with the seat pivoting portion 94 as a fulcrum. .
[0003]
Thereafter, as shown in FIG. 5C, a striker 95 is provided on the vehicle body floor 99 and a fixing band 96 is attached to the back side of the seat back 92, and the fixing band 96 is hooked on the striker 95 (for example, No. 4-15543) or a method in which a striker 97 is provided on the vehicle body floor 99 and a rod 98 is attached to the back side of the seat cushion 93, and this rod 98 is hooked on the striker 97 (for example, actual fair 5-28101). The folding sheet 91 is fixed in a substantially upright state. In this state, the vehicle body floor 99 can be used as a luggage compartment.
[0004]
[Problems to be solved by the invention]
However, the fixing structure has the following problems.
(1) Since the strikers 95 and 97 protrude on the vehicle body floor 99, there is a risk that the strikers 95 and 97 may prevent the passengers from getting on and off smoothly, or may catch the load when loading the cargo in the luggage compartment. is there.
(2) In order to securely fix the heavy folding sheet 91, the fixing band 96 and the rod 98 must be hooked with a certain tension so as not to loosen against the strikers 95, 97. Fixing the sheet 91 requires force and time.
[0005]
On the other hand, in order to solve these problems, there is a method (for example, Japanese Patent Laid-Open No. 10-29452 or Japanese Patent Laid-Open No. 11-115580) in which a lock mechanism is built in the sheet rotating portion 94. In the state where the seat 91 is folded, the posture of the folding seat 91 is fixed. For example, an occupant seated in the front seat of the folding seat 91 slides the front seat backward to widen the foot space. It is difficult to tilt the front seat back or back to relax.
The present invention has been made in view of such a situation, and an object of the present invention is to provide a folding seat rotation lock structure that can take a large cargo space and a wide space for passengers in the front seat.
[0006]
[Means for Solving the Problems]
A folding lock mechanism for folding a seat according to the present invention is made to solve such a problem, and includes a seat cushion and a seat back disposed at a rear portion thereof, and a front side of the lower surface of the seat cushion is The seat cushion is pivotally supported by a leg assembled to the vehicle body , and the seat cushion is urged in a direction to rotate forward by a spiral spring provided on the pivotal support portion. In the pivot locking structure of the folding seat that can be tilted forward and rotated forward in the state of being overlaid on the seat cushion and held in the standing position by the biasing force ,
The seat cushion includes a lock plate rotatably supported above the shaft support portion, and the lock plate has a length extending between a rotation proximal end side and a distal end side of the lock plate. A deformed hole comprising a hole-shaped first hole portion and a second hole portion extending in the short-axis direction from the long-axis direction intermediate portion of the first hole portion is formed, and the lock plate is opposite to the second hole portion. A lock pin that engages with the deformation hole is provided below the leg support portion of the leg, while a return spring that is biased in the direction of rotation is provided.
When the seat is in the upright position, the lock pin engages with the rotation proximal end of the first hole portion of the deformation hole to restrict the forward rotation of the seat, and the spiral When the seat is held in the standing position by the biasing force of the spring and the seat is rotated backward from the standing position against the biasing force of the spiral spring, the lock pin is engaged with the second hole portion of the deformation hole. combined rotation of the front and rear directions of the sheet is regulated, is held in an inclined posture at an intermediate position between the upright position and the seating position, characterized in Rukoto.
[0007]
Rotation to the inclined posture from the upright posture of the folded sheet is its permissible operating without holding release operation. That is, when the folding seat is folded upright, the front seat rail is slid rearward and the front seat back is tilted rearward so that the folding seat is pushed against the front seat back and automatically to appears to be locked slope behind to rotate to the next stage.
[0008]
This tilting posture may be only one, but it may be configured so that it can be locked in a plurality of different tilting postures, that is, the second hole portion of the deformation hole of the lock plate is the same as the first hole portion. It is preferable that a plurality are provided on the same side . In this case, the range of selection according to the usage situation is widened, and usability can be improved.
[0009]
Further, the lock plate is configured to move the lock pin from the second hole portion of the deformation hole to the first hole portion by rotating the lock plate against the urging force of the return spring. A lock release lever is preferably provided. Further, the unlocking lever is preferably that is extended in forward and downward from the lock plate. That is, the setting of the mounting angle of the unlocking lever for operating the lock can be selected.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a folding lock structure for folding sheets according to the present invention will be described with reference to the drawings.
First, the configuration of the folding lock mechanism of the folding sheet according to the present embodiment will be described with reference to FIGS. 1 and 5 to 7. As shown in FIG. 5, the rotation lock structure includes a leg 1, a bracket 2, a lock plate 3, a return spring 4, a lock release lever 5, a spiral spring 6, and a pin 7. 5 is an exploded perspective view when viewed from the arrow V in FIG.
[0011]
As shown in FIG. 5, the leg 1 is a plate-like member, and includes a base portion 11, a pair of flange portions 12 extending from the base portion 11, and a lock pin 13. The base portion 11 is formed with a rounded portion 11a corresponding to the shape of the vehicle body floor 85 to be attached (see FIG. 1), and two through holes 11b are provided along the longitudinal direction for the attachment. The base portion 11 is formed so that the coupling length with the pair of flange portions 12 is longer in order to increase the rigidity of the entire leg 1. The pair of flange portions 12 are arranged to face each other at a predetermined interval, and are provided with through holes 12a. The through hole 12 a is arranged so that a line connecting the center points is along the interval direction of the pair of flange portions 12. The lock pin 13 is fixed to each flange portion 12 by welding or the like, for example, and a protruding portion 13a that protrudes by a predetermined length on one side of the pair of flange portions 12 on the opposite side (front side in FIG. 5) is provided. ing.
[0012]
As shown in FIG. 5, the bracket 2 is a plate-like member having a U-shaped cross section, and includes a base portion 21, a pair of flange portions 22 extending from the base portion 21, and a stopper pin 23. The base portion 21 is formed with a round recess 21a corresponding to the peripheral shape of the frame 84 (see FIG. 6 or 7) of the folding sheet 81 to be attached. The pair of flange portions 22 are arranged so as to face each other at a predetermined interval, and the external measurement dimension (a value obtained by adding the plate thickness of each flange portion 22 to the value of the predetermined interval) is that of the pair of flange portions 12 of the leg 1. Slightly smaller than the predetermined interval value. The pair of flange portions 22 of the bracket 2 are provided with through holes 22a and 22b, respectively. The through holes 22 a and 22 b are arranged so that the lines connecting the respective center points are along the interval direction of the pair of flange portions 22. Each end face of the pair of flange portions 22 is provided with one relatively small notch portion 22c. The stopper pin 23 is disposed at such a position that the distance from the rounded recess 21a is relatively large. The stopper pin 23 is stretched over the pair of flange portions 22 and has one end portion on one side (the right rear side in FIG. 5). It is fixed in a protruding state.
[0013]
As shown in FIG. 5, the lock plate 3 is a plate-like member and includes a main body 31 and a pin 32. The main body 31 is provided with a deformation hole 33. The deformed hole 33 includes a first ellipsoidal hole 33a having a parallel portion and a semicircular first tip extending from the major axis direction intermediate portion of the first hole portion 33a to one side in the minor axis direction. 2 holes 33b. The first hole portion 33 a and the second hole portion 33 b are formed with a width that can receive the protruding portion 13 a of the lock pin 13 of the leg 1. The main body 31 is also provided with a hole 31a. The hole 31a has an oval shape and is arranged so that its longitudinal direction is the short axis direction of the first hole 33a. The pin 32 is disposed at a position where the distance from the hole 31a becomes relatively large, and is fixed so as to protrude in one direction (the right back side in FIG. 5). The pin 32 is stepped and has a slightly small diameter at the tip side. The tip end side of the pin 32 is formed so that it can be inserted into the through hole 22 b of the bracket 2. The main body 31 is further provided with a small diameter hole 31b.
[0014]
As shown in FIG. 5, the return spring 4 is a torsion coil spring, and has an inner diameter that can be inserted to the root of the pin 32 of the lock plate 3. The wire diameter of the return spring 4 is a dimension that can be inserted into the notch 22 c of the bracket 2 and the small diameter hole 31 b of the lock plate 3. Both end portions of the return spring 4 extend in the respective tangential directions, and their tips 41 and 42 are further bent outward in the axial direction of the return spring 4.
[0015]
As shown in FIG. 5, the lock release lever 5 is formed in a shape and size in which an end portion 51 can be fitted into the hole 31 a of the lock plate 3. The lock release lever 5 is integrally connected to the lock plate 3 by fitting the end 51 and the hole 31a. As shown in FIG. 6, the lock release lever 5 has a bent portion 52 that is bent into a substantially U shape, as shown in FIG. 6.
[0016]
As shown in FIG. 5, the spiral spring 6 is a flat spiral spring, and an outer end portion 61 of the spiral spring 6 is formed to be hookable with the stopper pin 23 of the bracket 2. The inner end portion 62 is also formed in a curved shape.
[0017]
As shown in FIG. 5, the pin 7 has an outer diameter that can be inserted into the through hole 12 a of the leg 1 and the through hole 22 a of the bracket 2, and its tip can be hooked with the inner end 62 of the spiral spring 6. A sliding portion 71 is formed.
[0018]
Next, assembly of the rotation lock structure of the folding sheet will be described with reference to FIGS.
As shown in FIGS. 5 to 7, the pair of flange portions 22 of the bracket 2 are inserted into the pair of flange portions 12 of the leg 1, and the pin 7 is inserted from the side of the leg 1 through the through holes 12 a of the leg 1 and The inner end portion 62 of the spiral spring 6 is engaged with the sliding portion 71 of the pin 7 that is inserted into the through hole 22a of the bracket 2 and penetrates to the opposite side. The outer end 61 of the spiral spring 6 is engaged with the stopper pin 23 of the bracket 2. In this state, the leg 1 and the bracket 2 are held so as to be pivotable about the pin 7, but the bracket 2 moves with respect to the leg 1 in the direction of the arrow Z (FIG. 5 or FIG. 5) by the urging force of the spiral spring 6. 7)).
[0019]
Then, as shown in FIGS. 5 to 7, the return spring 4 is inserted into the pin 32 of the lock plate 3 so that the tip 41 of the return spring 4 is engaged with the small diameter hole 31b, and the tip 42 of the return spring 4 is moved. Engage with the notch 22 c of the bracket 2. The pin 32 of the lock plate 3 is inserted into the through hole 22b of the bracket 2 and fixed to the opposite side. At this time, the protrusion 13 a of the lock pin 13 of the leg 1 is inserted into the deformation hole 33 of the lock plate 3. The end 51 of the lock release lever 5 is inserted into the hole 31a of the lock plate 3 and fixed. In this state, the bracket 2 and the lock plate 3 are held so as to be rotatable about the pin 32. However, the lock plate 3 moves with respect to the bracket 2 in the direction of the arrow Y (FIG. 3) by the urging force of the return spring 4. 5 or FIG. 8), and by rotating the lock release lever 5 in the direction opposite to the arrow Y direction, the urging force of the return spring 4 can be overcome and rotated in the opposite direction. Each component can be assembled as described above.
[0020]
The folding lock mechanism of the folding seat assembled in this way is such that the round recess 21a of the bracket 2 is welded to the lower surface on the outer periphery of the frame 84 of the seat cushion 83, and the round portion 11a of the leg 1 is further connected. After mounting on the vehicle body floor 85, for example, a bolt or the like (not shown) is screwed into a nut or the like (not shown) on the vehicle body floor 85 side from the through hole 11 b of the leg 1, and is assembled to the vehicle body. The frame 84 is disposed inside the seat cushion 83 in order to maintain the shape and strength. The vehicle body floor 85 is preliminarily provided with a threaded portion (not shown) to correspond to the nominal diameter of the through hole 11b. Such a rotation lock structure is attached to both sides of the seat cushion 83 symmetrically.
[0021]
Next, the operation and operation of the folding lock structure of the folding sheet will be described with reference to FIGS. First, the action of the two springs of the return spring 4 and the spiral spring 6 will be described. As shown in FIG. 5, the seat cushion 83 always tries to rotate forward about the pin 7 by the urging force of the spiral spring 6, but the seat back 82 is not superimposed on the seat cushion 83 (for example, In FIG. 10A, the folding sheet 81 does not rotate due to its own weight. That is, as shown in FIG. 1 or FIG. 8, the folding seat 81 and the protruding portion 13a (lock pin 13) are in the position 34c, and the seat cushion 83 is in the posture shown in FIG. Note that the urging force of the spiral spring 6 acts to assist the flip-up of the folding sheet 81.
Further, as shown in FIG. 5, the lock plate 3 always tries to rotate in the direction opposite to the extending direction of the second hole 33b of the deformation hole 33 around the pin 32 by the biasing force of the return spring 4, On the other hand, since the leg 1 is fixed to the vehicle floor 85, as a result, the protrusion 13a of the lock pin 13 of the leg 1 is biased in the extending direction of the second hole 33b of the deformation hole 33. It will be.
[0022]
When the seat back 82 is rotated forward and overlapped on the seat cushion 83 (see position 34c in FIG. 1 or FIG. 4) and the folding seat 81 is folded forward, the lock plate 3 follows the rotation of the bracket 2. The protrusion 13 a (the lock pin 13) is fitted in the second hole 33 b of the deformation hole 33 of the lock plate 3. That is, as shown in FIG. 8, the protrusion 13a of the lock pin 13 is at a position 34b. Since this position is held by the urging force of the return spring 4, the folding sheet 81 is locked in such an intermediate posture as shown in FIG. In such a position of the folding seat 81, although the luggage compartment 86 (see FIG. 9) is not yet wide enough, the position of the front seat 87 can be slid to the rear of the vehicle, so that the foot space for the passenger in the front seat 87 is widened. The seat back 82 can be tilted backward by reclining, and an easy posture can be taken.
[0023]
As shown in FIG. 3, when the bent portion 52 (see FIG. 6) of the lock release lever 5 is pushed in the direction of the arrow 53, the protruding portion 13 a of the lock pin 13 becomes the second hole portion 33 b (FIG. 5). From the reference) to the first hole 33a (see the same figure), thereby releasing the lock. When the folding sheet 81 is further pushed forward, the protrusion 13a of the lock pin 13 moves to the upper end of the first hole 33a of the deformation hole 33, and the protrusion 13a of the lock pin 13 The seat cushion 83 is held at the position 34a (see FIG. 8) by the urging force, and the posture as shown in the position 34a of FIG. 1 or FIG. Therefore, since the luggage compartment can be made wider than in the case of the above-described position 34b (intermediate posture), it is possible to load a long product. In this case, the angle adjustment operation of the folding sheet 81 can be easily performed.
[0024]
As shown in FIG. 2, when the protruding portion 13a of the lock pin 13 is located at the position 34a (see FIG. 8), the direction of the position 34b (see FIG. 8) is overcome by overcoming the biasing force of the spiral spring 6. It can move and is in a so-called free state. Therefore, as shown in FIG. 9, when the front seat 87 (front seat or second seat) is slid rearward (see FIG. 9A), the folded folding seat 81 becomes the seat back 87 a of the front seat 87. The folding sheet 81 rotates rearward and is automatically locked at a position 34b (see (b) in the figure). In this way, the passenger in the front seat 87 can tilt the folding seat 81 from the position 34a to the position 34b while sitting without operating the lock release lever 5 of the folding seat 81. When the lock release lever 5 is operated, the protrusion 13a of the lock pin 13 is disengaged from the second hole 33b of the deformation hole 33 and the weight of the folding sheet 81 moves backward. And is locked by the hole 34c.
[0025]
In this embodiment, the position 34a and the position 34b can be locked. However, the present invention is not limited to this, and the lock position can be increased to 3 or more by providing a plurality of second hole portions 33b in the deformation holes 33 of the lock plate 3. It is also possible to do.
Further, in this embodiment, as shown in FIG. 6 or FIG. 7, it is a double lock type in which the lock plate 3 is attached to both sides of the seat cushion 83. It is also possible to provide a lock release lever 5 'as shown in the figure.
Further, as shown in FIG. 7, the unlocking lever 5 in this embodiment is unlocked by pushing it down in the direction of the arrow 53 (downward), but the unlocking lever is moved from the front in the direction of the arrow 53 ′ (upward). It is also possible to configure to release the lock.
[0026]
【The invention's effect】
Rotation lock structure folding sheet according to the present invention, and a seat back disposed seat cushion and its rear, front side of the seat cushion lower surface, to be rotatable leg assembled to the vehicle body The seat cushion is urged in the direction of pivoting forward by a spiral spring provided on the pivot support, and the seat back is tilted forward and stacked on the seat cushion. In the rotation lock structure of the folding seat that can be rotated forward of the vehicle and held in the standing position by the urging force ,
The seat cushion includes a lock plate rotatably supported above the shaft support portion, and the lock plate has a length extending between a rotation proximal end side and a distal end side of the lock plate. A deformed hole comprising a hole-shaped first hole portion and a second hole portion extending in the short-axis direction from the long-axis direction intermediate portion of the first hole portion is formed, and the lock plate is opposite to the second hole portion. A lock pin that engages with the deformation hole is provided below the leg support portion of the leg, while a return spring that is biased in the direction of rotation is provided.
When the seat is in the upright position, the lock pin engages with the rotation proximal end of the first hole portion of the deformation hole to restrict the forward rotation of the seat, and the spiral When the seat is held in the standing position by the biasing force of the spring and the seat is rotated backward from the standing position against the biasing force of the spiral spring, the lock pin is engaged with the second hole portion of the deformation hole. In combination, the rotation of the seat in both the front and rear directions is restricted, and it is configured to be held in an inclined posture at an intermediate position between the standing position and the seating position . When the passenger's foot space in the front seat of the folding seat is widened or the seat back of the front seat is reclining, it can be handled by locking the folding seat in an inclined position. .
[0027]
The folding seat is configured to be allowed to rotate from the standing posture to the tilted posture without holding release operation. Even when the folding seat is in the standing posture, the front seat rail slides backward, By tilting the seat back backward, the folding seat is pushed backward by the seat back in the front seat and shifts from the standing position to the tilted position. Or the seat back of the front seat can be reclined, and the usability of the front seat occupant can be improved.
[0028]
In addition, the mechanism for locking the folding seat is incorporated in the vicinity of the shaft support portion, so that it is not necessary to separately provide a striker for fixing to a standing posture on the vehicle body floor, and the vehicle floor can be flattened without protruding. For this reason, the luggage compartment can be used widely, and there is no risk of the passenger getting in or out of the cabin due to the striker or damaging the luggage.
[0029]
The lock release lever, when formed so that is extended in forward and downward from the lock plate, it is possible to manipulate the lock release lever from the front side of the folded sheet, release operability is facilitated, even more usability Can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a folding sheet employing a folding locking mechanism for folding a sheet according to an embodiment of the present invention.
2 is an enlarged view of a portion A in FIG. 1 in a state in which the folding sheet in FIG. 1 is substantially upright.
3 is an enlarged view of a portion A in FIG. 1 in a state where the folding sheet in FIG. 1 is tilted backward.
4 is an enlarged view of a portion A in FIG. 1 when the folding sheet in FIG. 1 is in use.
FIG. 5 is an exploded perspective view of the folding lock structure of the folding sheet of FIG. 1;
6 is a plan view of the vicinity of part A in FIG. 1. FIG.
7 is an arrow view (side view) taken along arrow VII in FIG. 6;
8 is a side view showing the positional relationship between the lock plate and the lock pin in each posture of the folding sheet shown in FIG. 1. FIG.
FIGS. 9A and 9B are cross-sectional side views showing a state in which the folding sheet of FIG. 1 is installed in an automobile, where FIG. 9A shows a case where the folding sheet is in a standing position, and FIG. 9B shows a case where the folding sheet is in an inclined position. .
FIGS. 10A and 10B are side views of a folding seat employing a conventional folding locking mechanism for a folding seat, in which FIG. 10A is a use state, FIG. 10B is a state in which a seat back is stacked on a seat cushion, and FIG. The state where the sheet is erected and fixed while folded is shown.
[Explanation of symbols]
1 Leg 11, 21 Base part 11 a Round part 11 b Through hole 12, 22 Flange part 12 a, 22 a, 22 b Through hole 13 Lock pin 13 a Projecting part 2 Bracket 21 a Round recess 22 c Notch part 23 Stopper pin 3 Lock plate 31 Main body part 31 a Hole 31b Small-diameter hole 32, 7 Pin 33 Deformation hole 33a First hole 33b Second hole 34a, 34b, 34c Position 4 Return spring 41, 42 Tip 5, 5 'Unlock lever 51 End 52 Bend 53 , 53 'arrow 6 spiral spring 61 outer end 62 inner end 71 sliding part 81 folding seat 82 seat back 83 seat cushion 84 frame 85 body floor 86 luggage compartment 87 front seat 87a seat back (front seat)

Claims (4)

A seat cushion and a seat back disposed at a rear portion thereof, wherein a front side of the lower surface of the seat cushion is pivotally supported by a leg assembled to a vehicle body , and a spiral provided at the pivotal support portion the seat cushion by a spring are biased in a direction to rotate the front of the vehicle, the seat back tilted forward is rotated ahead of the vehicle in an overlapped state on the seat cushion, standing position by the biasing force In the folding lock structure of the folding sheet that can be held in
The seat cushion includes a lock plate rotatably supported above the shaft support portion, and the lock plate has a length extending between a rotation proximal end side and a distal end side of the lock plate. A deformed hole comprising a hole-shaped first hole portion and a second hole portion extending in the short-axis direction from the long-axis direction intermediate portion of the first hole portion is formed, and the lock plate is opposite to the second hole portion. A lock pin that engages with the deformation hole is provided below the leg support portion of the leg, while a return spring that is biased in the direction of rotation is provided.
When the seat is in the upright position, the lock pin engages with the rotation proximal end of the first hole portion of the deformation hole to restrict the forward rotation of the seat, and the spiral When the seat is held in the standing position by the biasing force of the spring and the seat is rotated backward from the standing position against the biasing force of the spiral spring, the lock pin is engaged with the second hole portion of the deformation hole. In addition, the rotation lock structure of the folding seat is configured such that the rotation of the seat in both the front and rear directions is restricted, and the seat is held in an inclined posture at an intermediate position between the standing position and the seating position. . 2. The folding lock structure for a folding sheet according to claim 1, wherein a plurality of the second hole portions of the deformation hole of the lock plate are provided on the same side of the first hole portion . The lock plate has a lock release for rotating the lock plate against the urging force of the return spring to move the lock pin from the second hole portion to the first hole portion of the deformation hole. The rotation lock structure for a folding sheet according to claim 1 or 2, wherein a lever is provided . The unlocking lever is pivoted locking structure of folding sheet according to claim 3, characterized that you have to extend in the forward and downward from the lock plate.

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