JPH0326032Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seat lifter for use in vehicles, particularly for adjusting the height of the front portion or the entire seat of an automobile seat.

[Conventional technology]

A car seat equipped with a seat lifter that adjusts the angle of the driver's seat to suit the driver's body length, making driving easier and reducing fatigue. There is.

An angle adjusting device for the seat lifter has been proposed as disclosed in Japanese Utility Model Publication No. 57-24592.

As shown in FIG. 3, this angle adjustment device is installed at the rear of the seat fixed on the slide rail 2 by operating the handle 4 in the direction shown by dotted lines on the vehicle seat 1 attached to the floor 3 via the slide rail 2. The angular position of the seat can be changed using the pin 6 of the bracket 5 as a pivot as shown by the dotted line.

This angle adjusting device is constructed as shown in FIGS. 4 to 6. That is, a channel-shaped bracket 8 is welded to the inside of the seat cushion frame 7, and a fan-shaped plate 1 having engaging teeth 9 is attached to the channel-shaped bracket 8.
A stopper arm 13 having a protruding stopper pin 12 that engages with the engaging teeth 9 of the fan-shaped plate 10 is pivoted at its base end by a pin 14. A stopper pin 12 is inserted into an arcuate long hole 15 formed in the bracket 8 centering on the slide rail 2, and the fan-shaped plate 10 is moved by the pin 18 to a long hole 17 formed in a front bracket 16 fixed to the slide rail 2. It is pivoted as possible. and,
A lock plate 19 is rotatably inserted into the protrusion of the shaft 11 protruding from the bracket 8 via a pipe 20, and the handle 4 is fixed to the end of the pipe 20, and the free end of the lock plate 19 A long hole 21 is provided in the bracket 8.
The stopper pin 12 is inserted into the arc-shaped long hole 15 of
A tension coil spring 22 is stretched between the tip of the stopper pin 12 and the intermediate portion of the lock plate 19.

In the angle adjusting device constructed as described above, in the locked state, the stopper arm 1 is biased by the biasing force of the tension coil spring 22 stretched between the stopper pin 12 and the lock plate 19, as shown in FIG. 6A.
3 and the lock plate 19 were rotated in directions corresponding to each other, and the stopper pin 12 was engaged with the intersecting inner end of the arc-shaped elongated hole 15 of the bracket 8 and the elongated hole 21 of the lock plate 19 facing the hook shape. In this state, it is engaged with one of the engagement teeth 9 of the fan-shaped plate 10, preventing rotation of the fan-shaped plate 10 and holding the seat portion of the seat at an arbitrary angle.

When the handle 4 is pulled up in this state, the lock plate 19 rotates, and the stopper pin 12 of the stopper arm 13 is guided into the elongated hole 21 while resisting the biasing force of the tension coil spring 22, and moves inside the arc-shaped elongated hole 15 of the bracket 8. The fan-shaped plate 10 moves and detaches from the engaging teeth 9 of the fan-shaped plate 10, and the fan-shaped plate 10 becomes rotatable around the shaft 11 (sixth
Figure B).

Then, when the seated person pushes the seat back with his or her back or loosens it, the seat cushion, that is, the seat cushion frame 7, moves up and down around the pin 6 of the rear bracket 5, changing the height of the front part.
Accordingly, the fan-shaped plate 10 rotates while moving along the elongated hole 17 of the front bracket 16 about the pin 18 as the shaft 11 rises and falls.
The position of the engagement tooth portion 9 is changed.

When the handle 4 is lowered with the front height of the seat cushion frame 7 changed in this way, the stopper pin 12 is engaged with the engagement teeth 9 at the changed position of the fan-shaped plate 10.
is locked and the seat cushion frame 7 is held in a state where the height is changed.

[Problem that the invention attempts to solve]

However, in the angle adjustment device configured in this way, it is easy to lock the seat cushion frame at the top or bottom position, but locking at an intermediate position requires the seated person to push the seat back with his or her back.
It is necessary to tilt the seat cushion and set it at approximately the middle position, and also,
In this adjustment locking operation, even when the seat cushion is tilted to an approximately intermediate position, the stopper pin 12 will move toward the fan-shaped plate 10 with a slight error.
There were some difficulties in operating the adjustment lock, such as not being able to accommodate the tooth troughs of the engaging tooth portion 9 and riding up on the ridges, making it impossible to lock.

In view of this, the present invention provides a seat lifter that allows the height of the seat to be adjusted easily and reliably even at intermediate positions.

[Means for solving problems]

In order to solve the above problem, the present invention pivots the rear part of the seat cushion frame rotatably on a pair of rear brackets substantially fixed to the vehicle floor, and the front part of the seat cushion frame 2 on the left and right
The two plates are pivotally supported via a single shaft integrated with both plates, and the ends of both plates are rotatably attached to long holes in a pair of front brackets that are substantially fixed to the vehicle floor. a plurality of engagement teeth are formed on the upper edge of one plate; a stopper arm having a stopper pin that engages with the engagement teeth is rotatably supported on the seat cushion frame; The frame is also provided with a lock plate that can pivot about the shaft and has a long hole having a direction different from the engagement direction of the stopper pin, and that biases the stopper pin in the engagement direction, and an engagement member that rotates the lock plate. In a seat lifter for a vehicle seat, which is equipped with a handle for releasing the lock plate, a relief part for the stopper pin is formed continuously above the tip of the elongated hole of the lock plate, and the stopper pin is elastically moved toward the plate with the engagement teeth by an elastic member. It is structured so as to bias the

[Effect]

In the seat lifter constructed as described above, when the lock plate is rotated by the handle, the stopper pin inserted through the elongated hole is disengaged from the tooth root of the engagement tooth portion of the plate and is brought into contact with the side of the tooth tip. When the seat cushion frame is lifted up in this state, the plate rotates and the tooth tips of the engaging teeth push the stopper pin, so that the stopper pin resists the biasing force of the elastic member around the pivot point of the stopper arm. Then, the stopper pin moves in a direction away from the engagement tooth portion of the plate along the relief portion of the elongated hole of the lock plate, and this stopper pin passes over the tip of the engagement tooth portion of the plate.

In this way, when the next tooth valley of the engagement tooth portion of the plate corresponds to the stopper pin, the stopper pin comes into contact with the lower edge of the elongated hole of the lock plate due to the biasing force of the elastic member, and the plate is engaged due to the biasing force of the lock plate. The seat cushion frame is set at the desired height by engaging the mating teeth and locking the plate.

In this operation, there is a feeling of moderation due to the operating force before and after the stopper pin crosses the tooth tip of the plate, the sound when it comes into contact with the lower edge of the long hole of the lock plate after getting over the tooth tip, and the return force acting on the handle at that time. Three types of moderation can be obtained, allowing you to reliably search for the next lock section.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 and 2. Members corresponding to those shown in FIGS. 3 to 6 of the conventional example described above are designated by the same reference numerals. explain.

In the angle adjusting device, that is, the seat lifter in this example, a bracket 8 is fixed to the inner surface of one side of the seat cushion frame 7 by a bolt 23, and has an engaging tooth portion 9 having a substantially triangular tooth tip. A shaft 11 to which a fan-shaped plate 10 is fixed is pivoted, and the engagement teeth 9 of the fan-shaped plate 10
A stopper arm 13 with a protruding stopper pin 12 for locking is pivoted at its base end by a pin 14, and the stopper pin 12 is inserted into an arcuate elongated hole 15 formed in the bracket 8 around the pivoted part of the pin 14. The pin 1 is inserted into the long hole 17 provided in the front bracket 16 fixed to a floor side member such as a slide rail.
8, it is movably pivoted.

On the other hand, a lock plate 19 is rotatably inserted into the protrusion of the shaft 11 protruding from the bracket 8 via a tubular shaft 20, and the tubular shaft 20 is inserted into a shaft support hole bored in the side of the seat cushion frame 7. 2
A handle 4 is fixed to the end of the handle 4 by a screw 25, and a long hole 21 is provided at one end side of the lock plate 19, and is inserted into the arc-shaped long hole 15 of the bracket 8. The stopper pin 12 is inserted and engaged. In this example, an enlarged recess 21a is formed on the upper edge side of the tip of the elongated hole 21 of the lock plate 19 as a relief part for the stopper pin 12, and this lock plate 19 has an engagement piece protruding from the other end. A tension coil spring 22 is stretched between 19a and an engagement piece 8a protruding from the upper edge of the bracket 8, and the elongated hole 21 on one end side is connected to the arc-shaped elongated hole 15 of the bracket 8.
is biased in a direction that intersects with The stopper arm 13 is engaged between a pin 14 that pivots the stopper arm 13 and an engagement piece 8a of the bracket 8, and a linear spring 26 that engages the stopper pin 12 at the intermediate portion and applies a pressing force thereto. rotationally biased.

An arm 27 is fixed to the other end of the shaft 11 by welding or the like, and the end of the shaft 11 is protruded from a support arm 29 fixed to the inner surface of the other side of the seat cushion frame 7 by a bolt 28. The arm 27 is inserted into a cylindrical shaft support 30 and is pivotally supported.
3, it is movably pivoted. Further, bearing bodies 34 are provided on both rear sides of the seat cushion frame 7.
is pivoted by a shaft pin 6 to a bracket 5 which is fixed by welding or the like to a floor side member.

Next, the operation of the seat lifter of this example configured as described above will be explained with reference to FIG.

Now, when the seat cushion frame 7 is at the lowest position, the stopper pin 12 of the stopper arm 13
is the lower tooth valley 9a of the engaging tooth portion 9 of the fan-shaped plate 10.
The seat cushion frame 7 is in a locked state at the lowest stage (FIG. 2A).

In this state, when the handle 4 is pulled up, the lock plate 19 is pulled up and the coil spring 22 is pulled up.
The stopper pin 12 of the stopper arm 13 is rotated against the biasing force of the bracket 8 and inserted into the elongated hole 21. The stopper pin 12 of the stopper arm 13 is guided while being pressed by the lower edge of the elongated hole 21, and the stopper arm 13, the lower tooth valley 9 of the sector-shaped plate 10 is raised against the biasing force of the linear spring 26.
a, the fan-shaped plate 10 is separated from the shaft 11
It is possible to rotate around the axis. In this state, the lock plate 19 is attached to the locking protrusion 8 provided on the bracket 8.
B is locked and cannot be rotated more than necessary (B in the same figure).
condition).

In this state, when the seated person pushes the seat bag with his or her back or lifts the front part of the seat cushion, the cushion frame 7 can be tilted about the rear pin 6 as a pivot point. The fan-shaped plate 10 has a shaft pin 18 connected to the elongated hole 1 of the bracket 16.
7, so as the shaft 11 rises, the fan-shaped plate 10 moves around the shaft pin 18.
8 rotates while moving through the elongated hole 17 of the front bracket 16, and the position of the engaging tooth portion 9 is changed.

At this time, the tooth tips of the engaging teeth 9 of the fan-shaped plate 10 press the stopper pin 12 of the stopper arm 13 against the biasing force of the linear spring 26, so that the stopper pin 12 is pushed against the lock plate 19 by the rotation of the stopper arm 13. Enlarged recess 2 of long hole 21
1a (the state shown in Figure C), the fan-shaped plate 10 is rotated in a state that kicks the stopper pin 12, and the tips of the engagement teeth 9 climb over the stopper pin 12 and move to the next stage as shown in the figure. In this case, the stopper pin 12 comes into contact with the lower edge of the elongated hole 21 of the lock plate 19 by the biasing force of the linear spring 26, with the middle tooth valleys 9b corresponding to each other. At this time, the stopper pin 12 is pressed against the lower edge of the elongated hole 21 of the lock plate 19, and this acts to return the lock plate 19 to the locked position. That is, since the lock plate 19 integrated with the handle 4 is about to be rotated, this feeling of moderation is directly transmitted to the operating hand. When the handle 4 is lowered in this state, the stopper pin 12 is engaged with the interrupted tooth valley 9b of the fan-shaped plate 10, the fan-shaped plate 10 is locked, and the seat cushion frame 7 is held in a state where the height has been changed (see FIG. D condition).

In the above operation, even if the stopper pin 12 rides on the tooth ridge of the engaging tooth portion 9 of the fan-shaped plate 10, the stopper pin 12 does not ride on the tooth ridge and falls into the tooth trough because the tip of the tooth is close to a triangular shape. The fan-shaped plate 10 is locked.

When the seat cushion frame 7 is to be lifted up further, the fan-shaped plate 10 is further rotated by pulling up the handle and performing the same operation as described above, and the stopper pin 12 is engaged with the uppermost tooth valley 9c, and the seat cushion frame 7 is lifted up. The action frame 7 will be held locked in the uppermost position. In addition, when lowering the seat cushion frame 7, pull up the handle 4, release the lock of the stopper pin 12 from the fan-shaped plate 10 by the lock plate 19, and then push down the seat cushion frame 7 in the opposite manner to the above case. be able to.

In this way, the height of the seat cushion frame 7 can be changed by rotating the lock plate 19 by pulling up the handle 4, disengaging the stopper pin 12 from the engagement teeth 9 of the fan-shaped plate 10, and rotating the fan-shaped plate 10 in the unlocked state. When the lock position is changed by moving the lock plate 19, there is a sense of moderation due to the change in operating force before and after the stopper pin 12 crosses the tooth tip of the engaging tooth portion 9 of the fan-shaped plate 10, and after the stopper pin 12 crosses the tooth tip, the lock plate 19 A total of three types of moderation sensations are provided, including the sound when the lower edge of the elongated hole 21 comes into contact with the biasing force of the linear spring 26, and the return force acting on the operating lever at that time. In particular, the intermediate lock position can be sensed reliably.

[Effect of idea]

As described above, the seat lifter according to the present invention can be locked at each adjustment position with a sense of moderation during the seat height adjustment operation, and the position can be set reliably.In particular, the intermediate position can be reliably detected. The height of the seat can be set as desired, and since it has a simple structure that only requires changing a few members from the conventional one, it is easy to manufacture and can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an example of a seat lifter according to the present invention, FIG. 2 is a side view of the seat lifter for explaining its operation, FIG. 3 is a side view of a vehicle seat equipped with the seat lifter, The figure is a perspective view of a conventional seat lifter as seen from the inside, and Figure 5 is the same.
FIG. 6, which is a perspective view of the seat lifter seen from the outside, is an explanatory diagram of the operation of the seat lifter. In the figure, 4 is a handle, 7 is a seat cushion frame, 8 is a bracket, 9 is an engaging tooth portion, 10 is a fan-shaped plate, 11 is a shaft, 12 is a stopper pin, 13 is a stopper arm, 15 is a long hole, 16
is the front bracket, 19 is the lock plate, 21
21a is an elongated hole, 21a is an enlarged recess, 22 is a tension coil spring, and 26 is a linear spring.

Claims (1)

[Claims for Utility Model Registration] The rear part of the seat cushion frame is rotatably supported by a pair of rear brackets that are substantially fixed to the vehicle floor, and two brackets are provided on the left and right sides of the front part of the seat cushion frame. The plate is pivotally supported via a single shaft that is integrated with both plates, and the ends of both plates are rotatably attached to long holes in a pair of front brackets that are substantially fixed to the vehicle floor. Support,
A plurality of engagement teeth are formed on the upper edge of one of the plates, a stopper arm having a stopper pin that engages with the engagement teeth is rotatably supported on the seat cushion frame, and the seat cushion frame is provided with a lock plate that can pivot about the shaft and has a long hole having a direction different from the engaging direction of the stopper pin, and biases the stopper pin in the engaging direction, and the lock plate is rotated to engage the stopper pin. In a seat lifter for a vehicle seat, which is provided with a handle for releasing the lock plate, a relief portion for the stopper pin is formed continuously at the top of the tip of the elongated hole of the lock plate, and the stopper pin is held in place by an elastic member such that the engagement tooth A seat lifter for a vehicle seat, characterized in that it is elastically biased toward a plate with a section.