JP4225140B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat, and more particularly to a vehicle seat provided with a tip-up mechanism that brings a seat cushion into a state in which a front end thereof is flipped up.
[0002]
[Prior art]
In this type of seat, a seat cushion (cushion frame) is rotatable about a rear end thereof. And by a tip-up mechanism, it can rotate to the state (tip-up state) which the seat cushion was flipped up from the seatable state. This tip-up mechanism can turn the seat cushion through a plurality of link members, and can lock the seat cushion in a seatable state or a tip-up state (for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2003-40009
[Problems to be solved by the invention]
When the seat cushion is locked in a seatable state, the seat cushion feels loose due to variations in dimensional accuracy of various parts including the tip-up mechanism. Therefore, if special processing such as cutting is performed in order to increase the dimensional accuracy of the part, the manufacturing cost increases. In addition, in order to eliminate the feeling of rattling of the seat cushion, the lower surface of the seat cushion in a seatable state may be strongly interfered with the buffer rubber, and the repulsive force of the buffer rubber may be used. However, even in this case, the amount of deformation of the shock-absorbing rubber varies greatly due to variations in the dimensional accuracy of the parts, and the locking force becomes nonuniform.
[0005]
An object of the present invention is to solve the problems of the prior art, and its purpose is to make it possible to absorb variations in the dimensional accuracy of various parts without increasing the dimensional accuracy of the parts by special processing or the like, thereby reducing costs and seating. This is to equalize the locking force for the seat cushion in the possible state.
[0006]
[Means for Solving the Problems]
The present invention is for achieving the above object, and is configured as follows.
The invention according to claim 1 is a vehicle seat provided with a tip-up mechanism capable of rotating a seat cushion from a seatable state to a state of being flipped up with respect to a leg plate , wherein the tip in up mechanism, one coupling part either of the link member that connects the seat cushion side and the leg plate side, a structure in which is inserted a connecting shaft to the link member elongated hole formed in the. And the adjustment member provided so that it may rotate centering around the axial center of this connection axis | shaft has the adjustment hole and the locking hole in two places from which the distance from the said connection axis differs. The link member is provided with an adjustment shaft positioned in the adjustment hole and a locking pin positioned in the locking hole.
The adjustment hole is set to have a shape in which a distance from the axis of the connection shaft changes with respect to a rotation direction of the adjustment member, and the adjustment hole is rotated when the adjustment member is rotated around the axis of the connection shaft. The hole and the adjustment shaft serve as a cam, and the link member is configured to move in the direction of adjusting the link length along the long hole with respect to the connection shaft. The locking hole extends along the rotation direction of the adjustment member, and the inner peripheral edge thereof and the locking pin are set so as to contact with a predetermined pressure angle with respect to the rotation of the adjustment member . .
Thus, by rotating the adjustment member about the axis of the connecting shaft, the link member can be moved by the action of the cam by the adjustment hole and the adjustment shaft, and the link length of the link member can be adjusted. . As a result, it is possible to absorb variations in the dimensional accuracy of various components when the seat cushion is locked in a seatable state, and it is not necessary to increase the dimensional accuracy of the components by special processing, thereby reducing costs. be able to. In addition, by absorbing the variation in the dimensional accuracy of various parts, for example, the amount of deformation of the buffer rubber that receives the seat cushion can be kept constant and the locking force can be kept uniform.
In order to rotate the adjustment member, the inner peripheral edge of the engagement hole formed with the adjustment hole on the adjustment member and the engagement pin fixed to the link member are in contact with each other with a predetermined pressure angle. It is necessary to apply a certain amount of force, and the adjustment member can be prevented from rotating carelessly.
[0007]
The invention according to claim 2 is the vehicle seat according to claim 1, wherein the adjustment shaft is a bolt, and the adjustment member is fixed to the link member by tightening the bolt. It is configured to that.
In this configuration, by tightening the adjustment shaft, it is possible to prevent a situation in which the adjustment member easily rotates with respect to the link member even if it receives some external load.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is a side view showing a seat with a tip-up function. FIG. 2 is an enlarged side view showing the internal structure of the lower part of the seat. As shown in FIG. 1, the seat includes a seat cushion 10 and a seat back 20. And the whole sheet | seat is supported by the leg plate 13 arrange | positioned at both lower sides as shown in FIG. The leg plate 13 can be slid in the front-rear direction by the seat slide mechanism 14 (FIG. 1).
[0011]
Specifically, the seat slide mechanism 14 is a pair of slide rails arranged on both sides of the seat. These rails are configured such that an upper rail 16 fixed to the leg plate 13 side is slidably assembled to a lower rail 15 fixed to the floor side of the vehicle body. The leg plates 13 on both sides are covered with a cover 18 together with a tip-up mechanism 30 and a reclining device (not shown) described below.
[0012]
As shown in FIG. 2, the rear portion of the cushion frame 11 of the seat cushion 10 is rotatably supported by the rotation shaft 12 with respect to the leg plate 13. By rotating the cushion frame 11 about the axis of the rotation shaft 12, the seat cushion 10 is lifted up to the seatable state (solid line state in FIG. 2) or to the seat back 20 side. It is possible to operate in the chip-up state (virtual line state in FIG. 2). On the upper surface near the front of the leg plate 13, a cushioning rubber 17 is provided for receiving the lower surface of the cushion frame 11 when the seat cushion 10 is in a seatable state (FIG. 2).
[0013]
Next, the tip up mechanism will be described.
FIG. 3 is an enlarged side view of a part of FIG. FIG. 4 is an enlarged cross-sectional view in the direction of arrow AA in FIG. As apparent from these drawings, the tip-up mechanism 30 is configured between the cushion frame 11 and the leg plate 13. Although the tip-up mechanism 30 is disposed on both sides of the seat, the individual configuration is substantially the same, so only the tip-up mechanism 30 on one side will be described below.
[0014]
The link structure constituting the tip-up mechanism 30 includes a first link member 31 and a second link member 36 in addition to the link structure of the cushion frame 11 with respect to the leg plate 13. The first link member 31 is arranged vertically, and its upper end is connected to the cushion frame 11 by a connecting shaft 32. The second link member 36 is arranged in the left-right direction, and one end portion thereof is rotatably supported by the support plate 39 with respect to the leg plate 13.
[0015]
The other end of the second link member 36 is divided into two arms 36 a and 36 b, and the end of one arm 36 a and the lower end of the first link member 31 are connected by a connecting shaft 33. The connecting portion between the first link member 31 and the arm 36a will be described in detail later. A lock pin 38 is fixed to the end of the other arm 36b (FIGS. 4 and 5). The function of the lock pin 38 will also be described later.
[0016]
As shown in FIG. 2, the spiral spring 40 is assembled on the axis of the support shaft 39 that is the rotation center of the second link member 36. Due to the elasticity of the spring 40, the second link member 36 is always urged clockwise in FIGS. This rotational force acts to push up the cushion frame 11 around the axis of the rotation shaft 12 through the first link member 31.
[0017]
That is, the seat cushion 10 always receives turning force to the tip-up state (the phantom line state in FIG. 2). A stopper 41 for receiving the second link member 36 is fixed to the leg plate 13. The stopper 41 restricts the rotational position of the second link member 36 in the clockwise direction. As a result, the tip-up position of the seat cushion 10 is restricted.
[0018]
FIG. 5 is a side view showing the locking means of the tip-up mechanism 30. The lock member 42 shown in this drawing is supported by the leg plate 13 so as to be rotatable about the axis of the rotation shaft 43 as a rotation center. A hook 42 a formed on the upper end portion of the lock member 42 can be engaged with a lock pin 38 fixed to the end portion of the arm 36 b in the second link member 36.
[0019]
As shown in FIG. 4, the torsion spring 44 assembled on the rotation shaft 43 urges the lock member 42 around the axis of the rotation shaft 43 in the clockwise direction of FIG. 5. Due to the elastic force of the spring 44, the engagement between the lock pin 38 and the hook 42a is always maintained, and the rotation of the second link member 36 by the spiral spring 40 is received. As a result, the tip-up mechanism 30 is locked and the seat cushion 10 is held in a seatable state.
[0020]
By the unlocking operation of the tip-up mechanism 30, the end 42b of the lock member 42 is moved in the direction of arrow a in FIG. As a result, the lock member 42 rotates about the axis of the rotation shaft 43 in the counterclockwise direction of FIG. 5 (the direction against the force of the spring 44), and the hook 42a is detached from the lock pin 38. For this reason, the lock of the tip-up mechanism 30 is released.
[0021]
6 is an enlarged side view of a part of FIG. FIG. 7 is a perspective view showing the structure of the connecting portion between the first link member 31 and the second link member 36 (arm 36a) in an exploded state. As is clear from these drawings, the connecting portion between the first link member 31 and the arm 36a includes a long hole 31a formed in the first link member 31 and a circular connecting hole 37 formed in the arm 36a. In this configuration, the connecting shafts 33 are connected. Moreover, the connecting shaft 33 supports the lower end portion of the adjustment member 50 simultaneously with the connection of the first link member 31 and the arm 36a.
[0022]
A circular support hole 51 is formed at the lower end of the adjustment member 50. Further, a stepped bolt is used for the connecting shaft 33. With the connecting shaft 33 inserted through the bush 34, the support hole 51 of the adjusting member 50, the long hole 31a of the first link member 31, and the connecting hole 37 of the arm 36a are inserted in this order, and a nut 35 having a hooked sleeve shape is formed. Tightened to. Thereby, the connecting shaft 33 is fixed to the arm 36a, and the long hole 31a of the first link member 31 and the support hole 51 of the adjustment member 50 are supported on the outer periphery of the bush 34 (FIG. 2). Therefore, the first link member 31 is movable in the vertical direction along the long hole 31a with respect to the connection shaft 33, and the adjustment member 50 is rotatable about the axis of the connection shaft 33 as a rotation center. .
[0023]
The adjustment member 50 is formed with an adjustment hole 52 and a locking hole 53 at two places where the distance from the rotation center is different. These holes 52 and 53 are set in a shape extending in a substantially arc shape along the rotation direction of the adjustment member 50. On the other hand, the first link member 31 is formed with round holes 31b and 31c at locations corresponding to the adjustment hole 52 and the locking hole 53, respectively. The adjustment shaft 54 inserted through the adjustment hole 52 and the round hole 31 b uses bolts, and can be fixed to the first link member 31 and the adjustment member 50 by tightening to the nut 55. Further, the stepped locking pin 56 inserted through the locking hole 53 and the round hole 31c is fixed to the first link member 31 by caulking the tip portion (FIG. 4).
[0024]
The adjustment hole 52 of the adjustment member 50 is set to have a shape in which the distance from the axis of the connecting shaft 33 changes in the rotation direction of the adjustment member 50. Therefore, when the adjustment member 50 is rotated about the axis of the connecting shaft 33, the adjusting hole 52 and the adjusting shaft 54 serve as a cam, and the first link member 31 has a long hole 31 a with respect to the connecting shaft 33. Move up and down the range. The movement of the first link member 31 adjusts the link length (the distance between the shaft centers of the connecting shafts 32 and 33).
Thus, the first link member 31 corresponds to the “link member” of the present invention. Further, the long hole 31a of the first link member 31 and the adjustment shaft 54, the adjustment hole 52 of the adjustment member 50, and the like mainly constitute the “link length adjustment means” in the present invention.
[0025]
The locking hole 53 of the adjustment member 50 is set to have a shape in which the inner peripheral edge thereof and the outer peripheral surface of the locking pin 56 come into contact with the rotation of the adjustment member 50 with a predetermined pressure angle. The pressure angle is based on the pressure acting downward from the seat cushion 10 side, and the inner peripheral edge of the locking pin 56 and the locking hole 53 rather than the component force acting in the inclined surface direction of the inner peripheral edge of the locking hole 53. This is the angle that increases the frictional force between the two. For this reason, even when the tightening of the adjusting shaft 54 and the nut 55 is loosened, it is necessary to apply a certain amount of load to rotate the adjusting member 50, and the adjusting member 50 can be easily rotated. Never do.
[0026]
When the seat cushion 10 is in a seatable state, when the tip-up mechanism 30 is locked by the locking means described above, the cushion frame 11 is received by the buffer rubber 17 (FIGS. 2 and 3). The amount of deformation of the buffer rubber 17 changes according to variations in dimensional accuracy of various parts. In order to maintain the locking force of the locking means evenly, it is important to keep the deformation amount of the buffer rubber 17 constant by absorbing variations in dimensional accuracy.
[0027]
Therefore, the adjusting member 50 is rotated around the axis of the connecting shaft 33 in a state where the tightening of the adjusting shaft 54 and the nut 55 is loosened. When the adjustment member 50 is rotated from the solid line position (substantially neutral position) in FIG. 6 in the direction of arrow b, the adjustment shaft 54 is displaced upward along the adjustment hole 52. As a result, the first link member 31 moves upward together with the connecting shaft 32, and the link length of the first link member 31 becomes longer.
[0028]
On the contrary, when the adjustment member 50 is rotated from the solid line position in FIG. 6 in the direction of the arrow c, the adjustment shaft 54 is displaced downward. Therefore, the first link member 31 moves downward together with the connecting shaft 32, and the link length of the first link member 31 is shortened. By adjusting the link length of the first link member 31 in this way, variations in dimensional accuracy of various parts are absorbed. After the link length is adjusted, the adjustment shaft 54 and the nut 55 are tightened to fix the adjustment member 50 so as not to rotate.
In the present embodiment, the link length adjusting means is configured at the connecting portion between the first link member 31 and the second link member 36 (arm 36a), but the first link member 31 and the cushion frame 11 are connected to each other. It is also possible to configure link length adjusting means in the connecting portion.
[Brief description of the drawings]
1 is a side view showing a seat with a chip-up function. FIG. 2 is a side view showing an enlarged internal structure of a lower portion of the seat. FIG. 3 is a side view showing a part of FIG. 4] Enlarged sectional view in the direction of arrow AA in FIG. 2. [FIG. 5] Side view showing the locking means of the tip-up mechanism. [FIG. 6] Side view showing a part of FIG. Perspective view of the connecting part of the member in an exploded state 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 10 Seat cushion 30 Tip-up mechanism 31 Link member 31a Long hole 33 Connection shaft 50 Adjustment member 52 Adjustment hole 54 Adjustment shaft

Claims (2)

A vehicle seat having a tip-up mechanism capable of rotating a seat cushion from a seatable state to a state of being flipped up with respect to a leg plate , wherein in the tip-up mechanism, the seat cushion side and Any one of the connecting parts of the link members connecting the leg plate side has a structure in which a connecting shaft is inserted into a long hole formed in the link member, and the axis of the connecting shaft is rotated. The adjustment member provided so as to rotate about the center is formed with an adjustment hole and a locking hole at two positions having different distances from the connecting shaft, and the link member is provided with an adjustment located in the adjustment hole. A shaft and a locking pin located in the locking hole are provided, and the adjustment hole is set to a shape in which the distance from the axis of the connecting shaft changes in the rotation direction of the adjustment member, When the adjusting member is rotated around the axis of the connecting shaft, the adjusting hole and the adjusting shaft serve as a cam, and the link member is linked to the connecting shaft along the elongated hole. The locking hole is configured to move in a direction in which the length is adjusted, and the locking hole extends along a rotation direction of the adjustment member, and an inner peripheral edge of the locking hole and the locking pin correspond to the rotation of the adjustment member. A vehicle seat set to contact with a predetermined pressure angle . The vehicle seat according to claim 1, wherein the adjustment shaft is a bolt, and the adjustment member is fixed to the link member by tightening the bolt. .

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