WO2006112486A1

WO2006112486A1 - Height lock device for vehicle seat

Info

Publication number: WO2006112486A1
Application number: PCT/JP2006/308245
Authority: WO
Inventors: Eiji Masutani
Original assignee: Ts Tech Co., Ltd.
Priority date: 2005-04-19
Filing date: 2006-04-19
Publication date: 2006-10-26
Also published as: JP4807770B2; JP2006298120A

Abstract

A height lock device for a vehicle seat has a height adjustment mechanism (10) provided between a bracket (70) fixed to a vehicle body (2) and the vehicle seat (1), a guide plate (42) fixed to the vehicle seat (1), and a gear plate (60) fixed to the bracket (70). A pair of lock arms (52, 52) is arranged on the guide plate (42), and the lock arms (52, 52) engage with the gear plate (60) when a load in an emergency is applied to a seatbelt (30) of a seated person. The lock arms (52, 52) are pivotally installed in position by lock shafts (51, 51) inserted with play into shaft holes (50, 50) that are provided in the guide plate (42).

Description

Specification

Height lock device for vehicle seat

Technical field

[0001] The present invention relates to a height lock device for a vehicle seat.

Background art

A conventional vehicle seat includes a seat belt mechanism that protects a seated person when a strong external force is applied to the seated person due to a vehicle collision or the like. When the seat belt mechanism supports a seated person against a strong external force, the seat belt mechanism applies a strong upward force to the vehicle seat.

For this reason, the vehicle seat is provided with a height lock mechanism that prevents the vehicle seat from moving up due to an upward load caused by the seat belt mechanism force S.

Patent Document 1: JP 2002-59770 A

Patent Document 2: Japanese Patent Laid-Open No. 2001-163091

Disclosure of the invention

[0003] A conventional height lock mechanism prevents an upward movement of a vehicle seat by engaging an arcuate gear portion of a lock arm with a gear. However, since the relative positional relationship between the gear and the lock arm changes with the change of the height position of the vehicle seat, the locking performance of the gear lock mechanism also changes with the change of the height position of the vehicle seat. Was.

[0004] Therefore, an object of the present invention is to provide a vehicle seat height lock device in which the locking performance is kept constant even when the height position of the vehicle seat is adjusted.

Brief Description of Drawings

FIG. 1 is a schematic view showing a side surface of a vehicle seat.

[Fig. 2] Front side of the height lock mechanism of the present invention.

FIG. 3 is an exploded view of the height lock mechanism.

FIG. 4 is a side view of the height lock mechanism.

FIG. 5 is a front view of the height lock mechanism.

FIG. 6 is a front view of the height lock mechanism in an unlocked state.

FIG. 7 is a front view of the height lock mechanism in an unlocked state. FIG. 8 is an enlarged front view showing a gear portion of a gear plate of the gear lock mechanism and an engagement gear of a lock arm.

FIG. 9 is a front view showing the height lock mechanism during the transition to the unlocked state force.

FIG. 10 is a front view showing the height lock mechanism during the transition to the unlocked state force.

FIG. 11 is a front view showing the height lock mechanism immediately before being locked.

FIG. 12 is a front view showing the height lock mechanism in a locked state.

BEST MODE FOR CARRYING OUT THE INVENTION

[0006] A vehicle seat 1 according to an embodiment of the present invention includes a seat bottom 4 that is slidably attached to a vehicle body (floor panel) 2 via a slide mechanism 3, and is attached to the seat bottom 4 so as to be rotatable about an axis 5. Seat back 6. In FIG. 1, an elastic member such as urethane foam to be attached to the vehicle seat 1 is omitted. The seat back 6 is held at an arbitrary angle with respect to the seat bottom 4 by the recliner mechanism 7.

The slide mechanism 3 includes a lower rail 8 that is fixed to the vehicle body 2 and an upper rail 9 that is slidably engaged with the lower rail 8. The integrated vertical bracket 70 of the upper rail 9 is connected to the seat bottom frame 71 via the height adjusting mechanism 10.

[0008] The height adjusting mechanism 10 includes a front rotating arm 72 and a rear rotating arm 73. The upper part of the front arm 72 is fixed to the seat bottom frame 71 by the front upper shaft 74, and the lower part of the front arm 72 is fixed to the vertical bracket 70 of the upper rail 9 by the front lower shaft 75. The upper part of the rear arm 73 is attached to the bottom frame 71 by the rear upper shaft 76, and the lower part of the rear arm 73 is fixed to the vertical bracket 70 by the rear lower shaft 77.

The operation unit 18 of the height adjusting mechanism 10 is provided at a desired position of the vehicle seat 1. The operation unit 18 includes an operation dial 24, a gear 22 that is rotated by the operation dial 24, and a sector gear 20 that is engaged with the gear 22 and rotates about a shaft 78. The sector gear 20 is connected to the upper part of the rear rotating arm 73 through connecting means 19 such as a rod and a gear. When the driver or passenger rotates the operation dial 24, the sector gear 20 rotates around the shaft 78, the inclination angle of the rear rotating arm 73 is changed, and the seat bottom 4 moves up and down. Move. The configuration of the height adjusting mechanism 10 is an example, and various conventional height adjusting mechanisms can be used in the present invention.

The vehicle seat 1 has a seat belt mechanism 79. The seat belt mechanism 79 includes a belt retractor 80 and a seat belt 30. The retractor 80 is fixed to the vehicle body 2 or the vehicle seat 1. The retractor 80 regulates the withdrawal of the seat belt 30 when a strong forward load is applied to the seat belt 30 due to a vehicle collision or the like. The front end of the seat belt 30 is connected to a belt anchor 41 (Fig. 2).

[0011] Between the upper rail 9 and the seat bottom frame 71, the seat belt 30 moves forward with respect to the upper rail 9 when a strong forward force is applied to the seat belt 30 and a load is applied. A height lock mechanism 40 is provided to prevent this. The height lock mechanism 40 has a pair of guide plates 42 and a gear plate 60 provided between the guide plates 42 as well shown in FIG. The guide plate 42 has a substantially triangular shape and is fixed to the seat bottom frame 71 by the upper mounting shaft 45. The distance between the guide plates 42 and 42 is kept constant by the stepped shaft 43 threaded through the vertical slots 44 and 44 of the guide plates 42 and 42. The guide plates 42 and 42 can move in the vertical direction relative to the stepped shaft 43.

[0012] The gear plate 60 has a vertically long U-shape, and a vertical bracket 70 is formed by a lower mounting shaft 64.

Fixed to (upper rail 9). The longitudinal groove 62 of the gear plate 60 is slidably supported by the stepped shaft 43.

A pair of shaft holes 50, 50 are provided on both lower sides of each guide plate 42, and lock shafts 51, 51 are passed through the shaft holes 50, 50, respectively. The lock arms 52 and 52 are rotatably supported. When the lock arms 52 and 52 are rotated inward, the lock arms 52 and 52 are engaged with and held by the gear portions 65 and 65 of the gear plate 60, so that the relative relationship between the gear plate 60 (vehicle body 2) and the guide plate 42 (vehicle seat 1) is obtained. Regulates vertical movement.

The knob lock mechanism 40 has a pair of moving plates 46 and 46 located outside the guide plates 42 and 42. Each moving plate 46 has an engagement hole 81 that engages with the stepped shaft 43, and the belt anchor 41 is fixed to the tip of the stepped shaft 43. When the seat belt 30 is pulled by an external force, the belt anchor 41 moves upward, whereby the stepped shaft 43 Also moves up in the longitudinal groove 62 of the gear plate 60. Further, the moving plates 46 and 46 fixed to the stepped shaft 43 also move upward at the same time.

[0015] Between the moving plates 46, 46, guide rods 54, 54 are provided. The guide rods 54 and 54 are slidably engaged with guide slots 53 and 53 formed on the distal ends of the lock arms 52 and 52, respectively. The upper leg portion of the panel 66 is attached to the moving plate 46, and the lower leg portion of the panel 66 is engaged with the bent portion 82 of the guide plate 42, and the moving plate 46 is biased downward by the elasticity of the panel 66.

[0016] When a normal external force is applied to the seat belt 30 (when an excessive external force due to a vehicle collision or the like is not applied to the seat belt 30), the belt anchor 41 is lowered by the elasticity of the panel 66. The stepped shaft 43 is positioned in the lower part of the vertical slot 44 of the guide plate 42. In this normal state, as shown in FIGS. 6 and 7, the guide rods 54 and 54 are located at the bases of the guide slots 53 and 53 of the lock arms 52 and 52, and the lock arms 52 and 52 are the gears of the gear plate 60. The height lock mechanism 40 is unlocked while being separated from the portions 65 and 65. Therefore, the distance between the vehicle body 2 and the vehicle seat 1 can be freely adjusted by the height adjusting mechanism 10.

On the other hand, when an excessive external force acts on the seat belt 30, the belt anchor 41 moves up, and the stepped shaft 43 moves to the upper part in the vertical slot 44 of the guide plate 42. Then, as shown in Fig. 10, the guide rods 54 and 54ί move to the guide slots 53 and 53 of the lock arms 52 and 52 toward the tip end, and the lock arms 52 and 52 rotate inward, and Fig. 12 Thus, the height lock mechanism 40 is locked by engaging with the gear portions 65 and 65 of the gear plate 60. As a result, the distance between the vehicle body 2 and the vehicle seat 1 is fixed.

[0018] As shown in FIG. 8, the vertical linear gear portion 65 of the gear plate 60 has a horizontal engagement surface 65 6 and an inclined guide surface 65Β, and the engagement gear of the lock arm 52 55 has a horizontal engagement surface 55Α that engages with the horizontal engagement surface 65Α and an inclined guide surface 55Β that engages with the inclined guide surface 65Β.

As described above, when an excessive external force acts on the seat belt 30, the lock arms 52, 52 rotate inward and engage with the gear portions 65, 65 of the gear plate 60. As shown in FIG. 10, at the moment when the engagement gears 55 and 55 of the lock arms 52 and 52 are engaged with the gear portions 65 and 65 of the gear plate 60, the tips of the engagement gears 55 and 55 and the gear portion 65 are engaged. The front end of 65 In rare cases, the combined gears 55 and 55 and the gear portions 65 and 65 are stacked and the height lock mechanism 40 cannot be smoothly displaced into the locked state. For this reason, in the present invention, the shaft hole 50 of the lock arm 52 is formed to have a larger diameter than the lock shaft 51, and play is provided between the shaft hole 50 and the lock shaft 51. In between, there is provided a spring 83 that urges the lock shafts 51 and 51 to approach each other. With this configuration, when the front ends of the engagement gears 55 and 55 and the front ends of the gear portions 65 and 65 collide frontally, the lock shafts 51 and 51 move through the wide shaft holes 50 and 50 against the elasticity of the panel 83. As a result, the engagement gears 55, 55 and the gear portions 65, 65 are out of phase, so that the stacking between the engagement gears 55, 55 and the gears 65, 65 is prevented, and the engagement gears 55, 55 and the gears ギ65, 65 can be engaged smoothly.

[0020] Next, the operation will be described.

When a normal external force is applied to the seat belt 30 (when an excessive external force is applied to the seat belt 30 due to a vehicle collision, etc.), the belt anchor 41 is moved downward by the elasticity of the panel 66. The stepped shaft 43 is held at the lower portion of the guide plate 42 in the vertical slot 44. In this normal state, as shown in FIGS. 6 and 7, the guide rods 54 and 54 are located at the bases of the guide slots 53 and 53 of the lock arms 52 and 52, and the lock arms 52 and 52 are the gear portions 65 and 65 of the gear plate 60. Separated from 65, the height lock mechanism 40 is unlocked.

In the above state, when adjusting the height of the vehicle seat 1, the operation dial 24 is rotated to rotate the sector gear 20, and the rear rotating arm 73 is rotated via the connecting means 19. As a result, the inclination angle of the rear rotating arm 73 is changed, the distance between the seat bottom frame 71 and the bracket 70 (vehicle body 2) is adjusted, and the height position of the vehicle seat 1 is changed. At this time, since the belt anchor 41 of the seat belt 30 moves up and down together with the guide plate 42 of the vehicle seat 1, even if the height of the vehicle seat 1 is changed, the seat belt 30 is not stretched or loosened.

[0022] When an excessive external force is applied to the seat belt 30 due to a vehicle collision or the like, the belt anchor 41 moves up against the elasticity of the spring 66, and the stepped shaft 43 is placed in the upper part of the vertical slot 44 of the guide plate 42. Moving. Then, as shown in Fig. 10, the guide rods 54, 54 move toward the tip of the guide slots 53, 53 of the lock arms 52, 52, and the lock arms 52, 52 rotate inward, As shown in Fig. 12, the gear plate 卜 60, gear 65, 65 【engages, and the lock mechanism 40 ま is locked. Thereby, the space | interval of the vehicle body 2 and the vehicle seat 1 is fixed. Accordingly, when an excessive external force acts on the seat belt 30, the lock arms 52, 52 rotate inward and engage with the gear portions 65, 65 of the gear plate 60. As shown in FIG. 10, the engagement gears 55 and 55 of the lock arms 52 and 52, the moment when the S gear plate 卜 60 engages with the gears 65 and 65, the tip of the engagement gears 55 and 55, and the gear. Very rarely occurs that the front ends of the portions 65 and 65 collide with each other, the engaging gears 55 and 55 and the gear portions 65 and 65 are stacked, and the height lock mechanism 40 cannot be smoothly displaced into the locked state. For this reason, in the present invention, the shafts 50, 50 of the lock arms 52, 52 are formed to have a larger diameter than the lock shafts 51, 51, and the shafts 50, 50 are arranged between the lock shafts 51, 51. A panel 83 is provided between the lock shafts 51 and 51 to urge the lock shafts 51 and 51 so as to approach each other. With this configuration, when the front ends of the engagement gears 55 and 55 and the front ends of the gear portions 65 and 65 collide with each other, the lock shafts 51 and 51 move in the wide shaft holes 50 and 50 against the elasticity of the panel 83. As a result, the engagement gears 55 and 55 and the gear portions 65 and 65 are out of phase with each other, so that the stacking between the engagement gears 55 and 55 and the gears 65 and 65 is prevented. It can be smoothly engaged with the key portions 65 and 65.

[0024] Further, when the lock arms 52 and 52 rotate inwardly about the lock shafts 51 and 51, the lower side of the engagement gears 55 and 55 of the lock arms 52 and 52 is the gear portion of the gear plate 60 first. 65 and 65, the initial engagement between the lock arms 52 and 52 and the gear plate 60 is completed. In this case as well, if there is no play between the shaft holes 50, 50 and the lock shafts 51, 51, the secondary engagement may not be performed smoothly. 50, 50 and the lock shaft 51, 51 are provided with play, so after the initial engagement is completed, the lock shaft 51, 51 force S wide shaft hole 50, against the elasticity of the panel 83 As shown in Fig. 10 to Fig. 12, the engagement gears 55 and 55 of the lock arms 52 and 55 are as follows. Engage.

[0025] When the seat lock mechanism 40 is in the locked state, the vehicle seat 1 is supported by the vehicle body 2 via the height adjusting mechanism 10 and the node lock mechanism 40. In other words, an excessive external force applied to the vehicle seat 1 due to a vehicle collision or the like is transmitted to the vehicle body 2 via both the height adjusting mechanism 10 and the height lock mechanism 40. For this reason, the strength required for the height adjustment mechanism 10 and the vehicle seat 1 can be suppressed, and the weight of the entire vehicle seat 1 can be reduced.

In the height lock mechanism 40 of the present invention, the gear plate 60 is fixed to the vehicle body 2 and the guide plate The seat 42 is fixed to the vehicle seat 1, and the gear plate 60 and the guide plate 42 always move relatively linearly even if the positional relationship between the vehicle body 2 and the vehicle seat 1 is changed. The lock arms 52, 52 are fixed to the guide plate 42. For this reason, the angle between the rotation direction of the lock arms 52 and 52 and the length direction of the gear plate 60 is always kept constant, and the engagement performance between the lock arms 52 and 52 and the gear plate 60 is also kept constant. It is.

The height lock mechanism 40 of the present invention includes two lock arms 52 and 52 that engage with the gear plate 60. For this reason, the locking performance of the height lock mechanism 40 is excellent.

[0028] As shown in FIG. 8, the vertical straight gear portions 65, 65 of the gear plate 60 have a horizontal engagement surface 65A, and the engagement gears 55, 55 of the lock arms 52, 52 are The horizontal engagement surface 55A engages with the horizontal engagement surface 65A. For this reason, the lock arms 52, 52 can be engaged with the gear plate 60 at an angle orthogonal to the moving direction of the gear plate 60, and the hook performance of the height lock mechanism 40 is further improved.

Claims

The scope of the claims

[1] A height adjustment mechanism that also provides a link mechanism force is provided between the bracket attached to the vehicle body side and the vehicle seat so that the height of the vehicle seat can be adjusted, and a guide plate is attached to the vehicle seat. A gear plate attached to the bracket is attached to the guide plate in a straight line, and the lock plate engages with the gear plate when an emergency load is applied to the seat belt of the seated person. A height lock device for a vehicle seat, wherein each lock arm is rotatably attached by a lock shaft inserted through a shaft hole provided in the guide plate with play.

[2] In Claim 1, an engagement gear and a guide slot are formed at the rotation end of each lock arm, respectively, and the guide slot moves when an emergency load is applied to the seat belt. A vehicle seat height lock device configured to engage a guide bar provided on a moving plate, and the guide slot and the guide bar engage the engaging gear with the gear portion when the moving plate moves. .

[3] In claim 2, the moving plate is attached to the guide plate via a belt shaft to which a seat belt is attached, and the belt shaft is attached to a vertical slot of the guide plate so as to be movable up and down. A vehicle seat height lock device whose shaft is mounted in a linear guide groove on the gear plate.

[4] The vehicle seat according to any one of claims 1 to 3, wherein each lock shaft of the pair of lock arms is provided with a panel that constantly biases the lock shafts so as to approach each other. Height lock device.

[5] In Claims 1 to 4, the engagement gear and the gear portion each have a horizontal engagement surface and an inclined guide surface, and are formed horizontally. The vehicle seat height lock device is configured such that the engaging surfaces are engaged with each other in a direction substantially intersecting with the moving direction of the guide plate.