JP2005138785A - Seat lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent displacement of a striker at locking and occurrence of a half-locked condition. <P>SOLUTION: A restricting groove 9a is formed in a latch 9 turnably around a shaft 8 and energized clockwise, while a pole 11 and a cam plate 12 turnably around a shaft 10 and energized counterclockwise are installed, wherein the cam plate 12 is made turnable for a certain amount relative to the pole 11, and the pole 11 to lock the latch 9 has a locking part 11a whose peripheral surface is formed in the shape of a circular arc centering on the shaft 10, and a part to be pressed 9d in a columnar shape is formed on the latch for pressing the latch 9, and the cam plate 12 is furnished with a cam part 12a abutting on the peripheral surface of the part 9d and pushing it out. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seat lock device that mounts and locks a seat provided in a vehicle interior on a vehicle body.

  The seats in the second and subsequent rows from the front of the car are assembled and used when a person gets on them, but if you want to use the interior of the car widely to carry luggage, you can fold it up and lean it forward or drop it on the floor. There are things that can be folded or stood against both sides. In such a seat, one side of the lower portion of the seat cushion is rotatably provided, and the other side is configured to be detachably attached to the floor surface by a seat lock device.

As shown in FIG. 2 of Patent Document 1, a conventional seat lock device prevents a striker from playing by sandwiching a striker that has entered a U-shaped groove of a base plate between a latch and a cam plate. In order to prevent the latch from rotating counterclockwise by the biasing force of the spring, the latch engaging claw is restrained by the pawl engaging portion and locked so as not to rotate.
Japanese Patent Laid-Open No. 11-208333 (FIG. 2)

  However, since an elastic body that assists the striker in the U-shaped groove of the base plate is provided, if the striker's pushing force is weak, the striker floats and the striker is misaligned, or the part dimensions There may be a half-locked state in which the engaging portion of the pole does not enter the interior of the engaging claw of the latch due to variations in the latch. In this half-locked state, if the striker is restrained from moving by the latch and cam plate, the latch will move even if a force is applied in the direction of pushing the striker by a person sitting on the seat. Therefore, there is a problem that the half lock cannot be eliminated and the gripping strength for gripping the striker is lowered.

  Therefore, an object of the present invention is to provide a seat lock device that solves the above-described problems.

According to a first aspect of the present invention, there is provided a striker fixed to the vehicle body side, a base member provided on a seat, a fitting groove formed in the base member for fitting the striker, and the base member A latch that is pivotably provided and engageable with a striker fitted in the fitting groove, a lock member that is pivotally provided on the base member and has an outer peripheral portion biased toward the latch, A pressing member provided so as to be rotatable about the same axis as the locking member, biased toward the latch, and rotatable relative to the locking member by a predetermined angle; and And unlocking means for rotating against the bias,
The latch includes a restraining groove that opens and closes in the fitting groove according to a rotation position of the latch, a biasing means that biases the latch in a direction in which the restraining groove opens, and the restraining groove is closed. And a lock receiving portion that engages with the lock member to prevent rotation of the latch, and a substantially arc-shaped pressed portion that protrudes from one side surface of the latch. A lock portion having an arc-shaped outer peripheral surface centering on the rotation center of the lock member is provided, and the striker in the restraining groove is pressed toward the inner wall side of the fitting groove on the outer peripheral portion of the pressing member. A cam portion is provided for pressing the pressed portion so that the latch rotates in a direction;
By pushing the striker into the constraining groove opened in the fitting groove, the lock member engages and locks the latch against the urging force of the urging means, and the lock releasing means The lock member is disengaged to release the lock.

  In such a seat lock device, when the striker enters the fitting groove and further enters the restraining groove, the latch rotates against the urging force of the urging means. Then, the lock portion of the lock member biased toward the latch rotates to lock the latch. Further, the pressing member is biased toward the latch, and the cam portion of the pressing member constantly presses the pressed portion. That is, the latch is locked and prevented from rotating in the direction in which the restraining groove is opened, and is always pressed in the direction in which the restraining groove is closed.

  When the lock member is rotated against the urging force by the unlocking means, the lock portion of the lock member releases the lock of the latch, and the pressing member is connected to the lock member so as to be relatively rotatable by a certain angle. For this reason, the cam portion of the pressing member is also separated from the pressed portion of the latch, the latch is rotated by the urging force of the urging means, and the latch is rotated in the direction in which the restraining groove is opened.

According to a second aspect of the present invention, in the seat lock device according to the first aspect, a protrusion is formed on one of the lock member and the pressing member, and the protrusion is formed on the other in the circumferential direction. By loosely fitting in the long hole, the pressing member is rotatable relative to the locking member by a certain angle,
When the striker is inserted into the insertion groove and engages with the restraining groove, the latch rotates, and before the cam portion presses the pressed portion, the lock portion receives the lock receiver. It is characterized by engaging with the part.

  In such a seat lock device, a configuration in which the pressing member rotates following the lock member and has a certain degree of freedom can be obtained simply by forming the protrusion and the long hole. Since the locking member is engaged with the latch before the pressing member is engaged with the latch, the latch and the striker are locked by the pressing member in a state where the locking member is not engaged with the latch. It can compensate for lock.

  The invention according to claim 3 is the seat lock device according to claim 1 or 2, wherein the pressed portion and the cam portion are engaged with each other between the lock receiving portion and the lock portion facing each other. A gap is formed in the surface.

  In such a seat lock device, the lock portion of the lock member can surely enter the proximal end side of the lock receiving portion of the latch.

  According to a fourth aspect of the present invention, in the seat lock device according to the third aspect, the lock receiving portion is configured so that a clearance on a proximal end side is larger than a clearance on a distal end side of the lock receiving portion. The center of the arc of the part is formed so as to be shifted from the rotation center of the lock member.

  In such a seat lock device, when the lock member slides on the outer peripheral surface of the latch and comes off the outer peripheral surface, the lock portion of the lock member immediately moves from the distal end side to the proximal end side of the lock receiving portion of the latch. There is no half-lock condition. In addition, when a large force is applied in the direction in which the striker is removed from the insertion groove, the lock member is rotated in the unlocking direction in order to come into contact with the lock portion of the lock member first from the front end side of the lock receiving portion of the latch. The generation of the component force in the direction to be caused can be reduced.

  According to the seat lock device of the present invention, since the lock portion of the lock member is formed in an arc shape centering on the rotation center of the lock member, unlike the cam shape, the lock portion is connected to the latch. It is easy to enter and it is possible to always ensure a large area of the engaging portion of both. For this reason, even if there is a variation in component dimensions or a misalignment of the striker, the lock strength is high and the half lock state is not obtained, and the strength is stable. Further, at the time of locking, since the cam portion of the pressing member always presses the pressed portion of the latch separately from the locking action, the striker is always pressed against the inner wall of the fitting groove by the latch, and play does not occur in the striker. Furthermore, since the portion where the cam portion of the pressing member abuts during this constant pressing is an arc-shaped pressed portion, the contact area is small, and the operating force of the unlocking means when unlocking can be reduced. . Furthermore, in the present invention, the locking of the latch and the pressing of the latch are performed separately, and the lock portion is formed in an arc shape instead of a cam shape, so that the lock member does not easily come off the latch. For example, even when the cam portion and the pressed portion of the pressing member are deformed and there is no gap between the locking portion of the locking member and the latch, the locking member does not come off the latch, and the locking strength is extremely high.

  Embodiments of the seat lock device according to the present invention will be described below. This embodiment shows a case where one side of the lower portion of the seat cushion is rotatably coupled to the floor surface of the vehicle body, and a seat lock device is provided between the other side and the floor surface.

  FIGS. 1A, 1B, and 1C are a plan view sectional view, a front view, and a left side sectional view of the seat lock device, showing only the main components of FIG. It is shown in 2. FIG. 2A is a diagram showing the unlocked state in which the restraining groove 9a is opened, and FIG. 2B is a diagram showing the locked state in which the restraining groove 9a is closed, and FIG. 4 (a) is enlarged.

  As shown in FIG. 1, a striker 2 is fixedly provided on a floor surface 1 of a vehicle body. The striker 2 is a rod-shaped member having a circular cross-sectional shape formed in a substantially inverted U shape, and both ends thereof are coupled to the floor surface 1.

  On the other hand, a seat lock device 4 is attached to the frame 3 of the seat cushion via a pair of bolts 5. The seat lock device 4 is configured by attaching each part to plate-like base members 6 a and 6 b, and the base members 6 a and 6 b are overlapped and coupled to the bracket 3 a of the frame 3 by bolts 5. As shown in FIGS. 1A and 1B, insertion grooves 7 are respectively formed at positions corresponding to each other of the base members 6a and 6b arranged in parallel to each other so that the striker 2 can be inserted thereinto. .

  A rubber 17 is provided at the bottom of the fitting groove 7 as an elastic member for assisting the jumping. The rubber 17 is coupled to the outside of the base member 6 b through a metal band 18. Both ends of the metal band 18 are joined by caulking the end portions of the shaft 8 and the shaft 10 that pass through the base members 6a and 6b.

  Between the base members 6a and 6b, a latch 9 is rotatably provided via the shaft 8. The latch 9 is formed with a constraining groove 9a that opens and closes in the insertion groove 7 by the rotation of the latch 9, can be inserted and removed in the opened state, and is constrained in the closed state.

  Further, as shown in FIG. 1A, a pole (lock member) 11 and a cam plate (pressing member) 12 are rotatably provided between the base members 6a and 6b via the shaft 10. ing. The shaft 8 and the shaft 10 are disposed at substantially symmetrical positions with the insertion groove 7 interposed therebetween. A spring (biasing means) 13 that urges the latch 9 in the clockwise direction, which is the direction in which the restraining groove 9a opens, is provided between the spring hooking portion 9b of the latch 9 and the spring hooking portion 11b of the pole 11. The pole 11 is biased toward the latch 9 by the spring 13.

  A lock portion 11 a is formed on the outer peripheral surface of the pole 11. The lock portion 11 a is formed in an arc shape centered on the shaft 10 that is the rotation center of the pole 11. On the other hand, a lock receiving portion 9c is formed in a stepped shape on the outer peripheral surface of the latch 9, and the latch 9 is locked when the latch 9 is rotated counterclockwise against the urging force of the spring 13. The lock portion 11a is engaged with the receiving portion 9c. The shape of the lock receiving portion 9c is formed in an arc shape having one center, and the center of the arc is formed so as to be shifted from the center of the shaft 10 toward the fitting groove 7 in the locked state. Yes. Therefore, in the locked state, there is a gap between the lock receiving portion 9c and the lock portion 11a that face each other, and the gap on the base end side is larger than the gap on the distal end side of the lock receiving portion 9c.

  An emboss projection 9d (pressed portion) is formed in the vicinity of the lock receiving portion 9c on one side of the latch 9. The embossing protrusion 9d has a cylindrical shape, and the entire outer peripheral surface has an arc shape. A cam portion 12 a that presses the outer peripheral surface of the emboss projection 9 d is formed on the cam plate 12 in order to press the latch 9 in the counterclockwise direction in which the restraining groove 9 a closes against the urging force of the spring 13. The cam portion 12a is formed in an arcuate surface whose outer diameter dimension sequentially increases as it goes in the clockwise direction of the circumference. A spring 14 is provided to bias the cam plate 12 toward the latch 9. The spring 14 is provided between a spring hook 12b formed on the cam plate 12 and a spring hook 6c formed on the base member 6b. Instead of the embossing protrusion, a hole may be formed, and a pin may be press-fitted into the hole to form the protrusion.

  The cam plate 12 is set so that it can rotate relative to the pole 11 by a certain angle. That is, a protrusion 11c is formed on the upper pole 11 in FIG. 1A, while a long hole 12c is formed on the lower cam plate 12 along a circle centering on the rotation center of the cam plate 12. The protrusion 11c is loosely fitted in the long hole 12c. Thus, when the lock state is shifted from the unlocked state to the locked state, the lock portion 11a of the pole 11 and the lock receiving portion 9c of the latch 9 before the cam portion 12a of the cam plate 12 engages with the embossing protrusion 9d of the latch 9 It is designed to engage.

  An unlocking means 15 for releasing the lock of the latch 9 is provided by manually rotating the pole 11 in the clockwise direction in FIG. 1B against the urging force of the spring 13. That is, as shown in FIG. 1B, one end of the wire 15 is coupled to the spring hook portion 11b, and the other end of the wire 15 is attached to a seat back (not shown) via the inside of the tube 16 attached to the base member 6a. It is coupled to a knob (not shown) provided.

  Next, the operation of the seat lock device will be described. FIG. 3 shows the operation until the striker is inserted into the insertion groove and is locked, and FIG. 4 shows the operation until the striker is removed from the insertion groove from the locked state.

  As shown in FIGS. 3A to 3C, when the striker 2 is pushed into the fitting groove 7, the striker 2 enters the restraining groove 9 a of the latch 9, and the restraining groove 9 a is inclined with respect to the pushing direction of the latch 9. Therefore, the latch 9 is rotated counterclockwise against the urging force of the spring 13, and the restraining groove 9 a becomes a horizontal state substantially perpendicular to the fitting groove 7. Thereby, the striker 2 moves to the substantially bottom part of the restraint groove | channel 9a. During this time, the pole 11 biased by the biasing force of the spring 13 slides while being pressed against the outer peripheral surface of the latch 9. When the latch 9 further rotates, as shown in FIG. 3 (d), the front end side of the lock portion 11a starts to engage with the front end side of the lock receiving portion 9c of the latch 9, and then the front end portion of the lock portion 11a immediately follows. As shown in FIG. 3 (e), it moves to the proximal end side of the lock receiving portion 9c and comes into contact therewith, and the length of the engaging portion between the lock portion 11a and the lock receiving portion 9c is increased. Here, since the pawl 11 is engaged with the latch 9 before the cam plate 12 is engaged with the latch 9, the cam plate 12 latches the latch 9 with the pawl 11 not engaged with the latch 9. Furthermore, the striker 2 is not locked, and the lock can be compensated. Then, until the state shown in FIG. 3D, the cam plate 12 that could not rotate counterclockwise relative to the pole 11 because the protrusion 11c is located at the right end of the long hole 12c is shown in FIG. e) Since the protrusion 11c is positioned in the middle of the elongated hole 12c after that, the cam plate 12 is rotated counterclockwise by the urging force of the spring 14 as shown in FIGS. 3 (f) to 3 (g). As shown in FIG. 3G, the cam portion 12a pushes out the embossing projection 9d, and the latch 9 is slightly rotated counterclockwise from the state of FIG. 3F. For this reason, as shown in FIG. 3G, a gap (A) is formed between the lock portion 11a and the lock receiving portion 9c. In the state shown in FIG. 3G, the lock portion 11a is in a locked state in which the lock portion 11a is engaged with the lock receiving portion 9c, and the cam portion 12a constantly presses the emboss projection 9d. 2B, the latch 9 always presses the striker 2 against the upper rubber 17 in FIG. 2B, and the striker 2 maintains a state where there is no play in the vertical direction. When a large force is applied in the direction in which the striker 2 comes out of the insertion groove 7 in the state where the gap (A) in FIG. 3G is formed, the tip end side of the lock receiving portion 9c of the latch 9 is the lock plate first. Therefore, the generation of the component force in the direction of rotating the lock plate 12 in the unlocking direction is reduced. Further, as shown in FIG. 3 (g), since the area of the portion where the lock portion 11a and the lock receiving portion 9c are engaged is large, the lock strength is high and the half lock state is not caused. Furthermore, when a person sits on the seat, a load is applied to push the striker 2 toward the bottom surface side of the insertion groove 7. At this time, even if the striker 2 moves slightly to the bottom surface side, the latch 9 is pushed by the cam plate 12 and rotated by that amount, so that no backlash occurs.

  Next, the flow from the locked state to the unlocked state will be described. When the wire 15 is pulled by pulling the knob (not shown) from the locked state of FIG. 4 (a), the pole 11 is rotated clockwise, and the protrusion 11c is a long hole 12c as shown in FIG. 4 (b). Move from the middle to the right end. When the wire 15 is further pulled, the pole 11 and the cam plate 12 are integrally rotated clockwise as shown in FIGS. 4C and 4D due to the relationship between the protrusion 11c and the long hole 12c. As shown in FIG. 4E, after the cam portion 12a is disengaged from the embossing projection 9d, the lock portion 11a is disengaged from the lock receiving portion 9c, and the latch 9 is moved by the biasing force of the spring 13 as shown in FIG. Rotating clockwise, the striker 2 is pushed out from the inside of the restraining groove 9a and the fitting groove 7. At this time, the lock groove 9a is opened inside the fitting groove 7 to be unlocked.

  In this embodiment, the seat cushion is attached to the seat cushion, but it can also be attached to the seat back. Further, the striker may be fixed to the seat and the other part of the seat lock device may be attached to the vehicle body side. Furthermore, although the pressed portion used was a cylindrical shape having an arc shape on the entire circumference, it is sufficient that at least only the portion in contact with the cam portion is an arc shape.

1 is a sectional view in plan view, FIG. 2B is a front view, and FIG. 3C is a sectional view in left side (embodiment). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified view of a seat lock device, in which (a) is a block diagram showing a lock release state, and (b) is a block diagram showing a lock state (embodiment). Explanatory drawing (Embodiment) which shows the effect | action from the lock release state of a seat lock apparatus to a locked state. Explanatory drawing (Embodiment) which shows the effect | action from the locked state of a seat lock apparatus to a lock release state.

Explanation of symbols

2 ... striker 6a, 6b ... base member 7 ... fitting groove 9 ... latch 9a ... constraining groove 9c ... lock receiving portion 9d ... pressed portion 11 ... pole (lock member)
11a ... Lock part 11c ... Projection part 12 ... Cam plate (pressing member)
12a ... cam portion 12c ... long hole 13 ... spring (biasing means)
14 ... Spring 15 ... Wire (lock release means)

Claims (4)

A striker fixed on the vehicle body side,
A base member provided on the seat;
An insertion groove formed in the base member for inserting the striker;
A latch that is rotatably provided on the base member, and is engageable with a striker fitted in the fitting groove;
A locking member that is pivotally provided on the base member and whose outer peripheral portion is biased toward the latch;
A pressing member provided so as to be rotatable about the same axis as the locking member, biased toward the latch, and rotatable relative to the locking member by a predetermined angle;
Unlocking means for rotating the lock member against the bias;
Composed of
The latch includes a restraining groove that opens and closes in the fitting groove according to a rotation position of the latch, a biasing means that biases the latch in a direction in which the restraining groove opens, and the restraining groove is closed. And a lock receiving portion that engages with the lock member to prevent rotation of the latch, and a substantially arcuate pressed portion that protrudes from one side of the latch,
The lock member is provided with a lock portion having an arcuate outer peripheral surface centered on the rotation center of the lock member,
A cam portion that presses the pressed portion is provided on the outer peripheral portion of the pressing member so that the latch rotates in a direction to press the striker in the restraining groove toward the inner wall side of the fitting groove,
By pushing the striker into the constraining groove opened in the fitting groove, the lock member engages and locks the latch against the urging force of the urging means, and the lock releasing means The seat lock device according to claim 1, wherein the lock member is disengaged to release the lock. 2. The seat lock device according to claim 1, wherein a protrusion is formed on one of the lock member and the pressing member, and the protrusion is loosely fitted in a circumferential long hole formed on the other. The pressing member is rotatable relative to the locking member by a certain angle,
When the striker is inserted into the insertion groove and engages with the restraining groove, the latch rotates, and before the cam portion presses the pressed portion, the lock portion receives the lock receiver. A seat lock device that engages with a portion. 3. The seat lock device according to claim 1, wherein a gap is formed between the lock receiving portion and the lock portion facing each other in a state where the pressed portion and the cam portion are engaged. A seat lock device. 4. The seat lock device according to claim 3, wherein the center of the arc of the lock receiving portion is a lock member such that a clearance on a proximal end side is larger than a clearance on a distal end side of the lock receiving portion. The seat lock device is characterized by being shifted from the center of rotation.

Images