JP2000118273A - Vehicular seat lifter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure by forming the structure for vertically moving a seat by driving force of an operation member through a brake device and a driving mechanism by releasing the engaging state by selectively allowing an abutting member to abut to respective fastening members according to the position and the operation direction by operating the operation member. SOLUTION: When an operation lever is rotated upward to lift a seat, a plate 11 abuts to a pin 15 to release an engaging state of the plate 11 and a ratchet 9. At the same time, the ratchet 9 is pushed by the plate 10, the ratchet 9, an input shaft 3 and an output shaft rotate, and the seat rises through a driving mechanism. When the operation lever reaches a position A, the plate 10 abuts to an inclined face 5b of the recessed part 5a. The operation lever also reaches the position A or A', and when an operator releases a hand the operation lever and a casing 5 are returned to a neutral position by a tension coil spring 8. At this time, input from the output shaft is locked by a brake device to check lowering of the seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat lifter device, and more particularly to a vehicle seat lifter device for moving a seat up and down through a speed reduction mechanism, a drive arm and a link mechanism by operating an operation member. It is about.

[0002]

2. Description of the Related Art Conventionally, various seat lifters have been proposed which improve the ride comfort of passengers by raising and lowering a seating surface of a seat in a vehicle cabin. For example, U.S. Pat.
Japanese Patent No. 1 and US Pat. No. 5,076,611 disclose a vehicle seat lifter device in which a seat is moved up and down by a drive mechanism via a speed reduction mechanism or the like by operating an operation member. This seat lifter device is supported so as to be able to take a ratchet connected to a drive shaft for outputting to a drive mechanism via a deceleration mechanism or the like, and a position engaging with the teeth of the ratchet and a position not engaging with the ratchet. A pair of stop members, a spring for urging the stop members toward positions for engaging the ratchet teeth, and an operator for selectively releasing an engagement state between each stop member and the ratchet teeth. A switching member. Then, the operator first operates the switching member to determine the operation direction of the seat lifter device, and then operates the operation member to actually operate the seat lifter device to move the seat up and down.

[0003]

However, the above structure has a problem that not only the operation direction switching structure is complicated, but also the switching operation and the operation of the operation member must be performed at the time of operation, and the operation is complicated. was there.

Further, in the above structure, each stop member engaging with the teeth of the ratchet is rotatably fastened to the casing. However, the precision of the parts and the assembling accuracy are increased so as to engage / disengage the ratchet with high accuracy. However, there is a problem that the cost increases and the assembling work becomes complicated.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to simplify the structure of a seat lifter device and improve operability.

[0006]

In order to achieve the above object, the present invention provides a vehicle seat lifter device for moving a seat up and down by operating an operation member, wherein the seat is driven. A drive mechanism, a brake device connected to the drive mechanism, allowing input from the operation member-side input shaft, and prohibiting input from the drive mechanism-side output shaft; and a ratchet connected to the brake device. A pair of stop members individually supported by the operating member so as to be able to take a position where the ratchet engages and a position where the ratchet does not engage, and engage the stop member with a common tooth of the ratchet And a pair of springs each of which biases toward the position to be pressed, and selectively abuts on each of the stop members in accordance with the position of the operating member, and selectively stops the stop member against the biasing force of the spring. A contact member for disengaging the ratchet from the engagement state with the teeth. By operating the operation member, the contact member is selectively provided to each of the stop members in accordance with the position and the operation direction. The vehicle seat lifter device is characterized in that the seat is lifted up and down by the driving force of the operating member via the brake device and the driving mechanism, the engagement state being released by contact with the vehicle. provide. In particular, when the base end of the stop member is engaged with a groove formed in a casing that receives the ratchet and the stop member, the stop member is supported to be tiltable, and the tilting range is defined. good.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of a main part of a vehicle seat lifter device to which the present invention is applied, and FIG. 2 is a front view showing an internal structure thereof. A bracket 1 fixed to a cushion frame of a seat (not shown) supports a brake device 2 having an input shaft 3 and an output shaft 4 connected to a vertical drive mechanism of the seat (not shown). The shaft 3 is an operation lever 6 described later.
Together with the casing 5 forming an operation member. The casing 5 can rotate around the input shaft 3. An operation lever 6 for an occupant seated on the seat to operate is integrally attached to the casing 5. Pin 7 and casing 5 attached to bracket 1
A tension coil spring 8 is provided between the first and second members to urge the operating lever 6 to return the lever 6 and the casing 5 to the neutral position when the operating lever 6 is operated. Here, the brake device 2 transmits the input from the input shaft 3 to the output shaft 4,
Further, the input from the drive mechanism side output shaft 4 is locked and is not transmitted to the input shaft 3.

A ratchet 9 is held at the tip of the input shaft 3 located in the casing 5. This ratchet 9
Plate 9 as a pair of stopper members
1 can be selectively engaged.

The plates 10, 11 are engaged such that their base ends enter the recesses 5 a in the casing 5, and can be tilted between positions at which their distal ends engage with the teeth 9 a of the ratchet 9. It has become. Plate 1
Coils 0 and 11 are urged by compression coil springs 12 and 13 toward positions where the tips thereof engage with the teeth 9a of the ratchet 9.

A pin 15 as a contact member provided on the bracket 1 protrudes into the casing 5 through a curved long hole 5c formed in the casing 5, and selectively contacts the plates 10 and 11. It comes into contact. The pin 15 and the elongated hole 5c define a rotation (tilt) range of the casing 5 and the operation lever 6. Also, when the plates 10, 11 abut on the slopes 5b of the recesses 5a in the casing 5 when the tips of the plates 10 and 11 are tilted to positions where they do not engage with the teeth 9a of the ratchet 9,
Eleven tilt ranges are defined. However, this range is adjusted by adjusting the size of the concave portion 5a and the concave portion 5a and the plate 10,
11 has a slight width due to the presence of a play. The rotation range of the casing 5 and the operation lever 6 by the pin 15 and the slot 5c is larger than the tilt range of the plates 10 and 11 by the plates 10 and 11 and the recess 5a, that is, the rotation range of the casing 5 and the operation lever 6. Is slightly larger.

Next, the operation of the seat lifter will be described in detail with reference to FIGS. First,
Normally, as shown in FIG. 2, the casing 5 and the operation lever 6 are biased to the neutral position by the tension coil spring 8. In this state, the plates 10 and 11 are urged by the compression coil springs 12 and 13 so that the plates 10 and 11
a, the input shaft 3, the output shaft 4 and the ratchet 9 are maintained in their positions without rotating in any direction by the brake device 2.

In order to raise the sheet from this state, the operation lever 6 is turned upward as shown by an arrow in FIG. Then, the plates 10 and 11 move, but the plate 11 comes into contact with the pins 15 and the engagement between the plate 11 and the ratchet 9 is released. At the same time, the ratchet 9 is pushed by the plate 10 to rotate the ratchet 9, the input shaft 3 and the output shaft 4, and the sheet is raised via a drive mechanism (not shown). Then, when the operation lever 6 reaches the position A, the plate 10 first comes into contact with the slope 5b of the concave portion 5a, and the operator feels that the end point of the rotation range is informed by the sense of moderation. When the pin 15 is further rotated, the pin 15 comes into contact with the end of the elongated hole 5c at the position A ', and the movement is completely stopped. At this time, since the plate 10 is not pivotally supported by a fixed shaft member or the like and can be tilted only by entering the concave portion 5a, there is a certain degree of freedom in its operation, And finally the pin 15 and the slot 5
c, the plate 1 receives the force due to the turning operation.
0, 11, compression coil springs 12, 13 and ratchet 9
Will not destroy the one-way mechanism.

When the operating lever 6 reaches the position A or the position A 'and the operator releases his / her hand or relaxes the force, the operating lever 6 and the casing 5 are returned to the neutral position by the tension coil spring 8. At this time, since the input from the drive mechanism output shaft 4 is locked by the brake device 2, the seat does not descend. Also, the input shaft 3 and the ratchet 9 do not rotate, and only the operation lever 6 and the casing 5 return,
The state shown in FIG. 2 is obtained.

Next, in order to lower the sheet, the operation lever 6 is turned downward as shown by the arrow in FIG. Then, the plates 10 and 11 move, but this time the plate 10 comes into contact with the pins 15 and the engagement between the plate 10 and the ratchet 9 is released. At the same time, the ratchet 9 is pushed by the plate 11 to rotate the ratchet 9, the input shaft 3 and the output shaft 4, and the sheet is lowered via a drive mechanism (not shown). When the operating lever 6 reaches the position B, the plate 11 first comes into contact with the slope 5b of the concave portion 5a, and the operator feels that the end point of the rotation range is informed to the operator. When the pin 15 is further rotated, the pin 15 comes into contact with the end of the elongated hole 5c at the position B ', and the movement is completely stopped. Then, when the operating lever 6 reaches the position B or the position B 'and the operator releases his / her hand or loosens the force, only the operating lever 6 and the casing 5 return to the neutral position as described above, and the state shown in FIG. Become.

[0016]

As is apparent from the above description, according to the seat lifter device of the present invention, the drive mechanism for driving the seat allows the input from the input shaft on the operation member side,
A ratchet is connected via a brake device that inhibits input from the drive mechanism side output shaft, and each ratchet is individually supported by an operating member so as to be able to take a position where the ratchet engages with a tooth and a position where it does not engage. Each of the stop members is spring-biased toward a position where the stop member engages with the common tooth of the ratchet, and the contact members selectively abut against these stop members in accordance with the position of the operating member. The stop member is selectively disengaged from the engagement state with the ratchet teeth, and by operating the operation member, the contact member selectively contacts each stop member according to its position and operation direction. The engaging state is released, and the seat is moved up and down by the driving force of the operating member via the brake device and the driving mechanism. Adjustment for assembly Come, can also be high is component accuracy obtained easily desired operating reliability. In addition, this structure eliminates the need to select an operation direction, thereby improving operability. Further, by engaging the base end of the stop member with a groove formed in the casing for receiving the ratchet and the stop member so as to tiltably support the stop member, the assembling adjustment is further facilitated, and at the time of operation. The escape of excessive force can be secured, and high rigidity is not required at this portion, so that the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a vehicle seat lifter device to which the present invention is applied.

FIG. 2 is a front view showing an internal structure of a main part of a vehicle seat lifter device to which the present invention is applied.

FIG. 3 is a view similar to FIG. 2, illustrating the operation of the vehicle seat lifter device to which the present invention is applied in conjunction with FIG. 4;

FIG. 4 is a view similar to FIG. 2, illustrating the operation of the vehicle seat lifter device to which the present invention is applied in combination with FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 bracket 2 brake device 3 input shaft 4 output shaft 5 casing 5a recess 5b slope 5c long hole 6 operation lever 7 pin 8 pulling coil spring 9 ratchet 9a teeth 10, 11 plate 12, 13 compression coil spring 15 pin

Claims (2)

[Claims] 1. A vehicle seat lifter device configured to move a seat up and down by operating an operation member, comprising: a driving mechanism for driving the seat; and a driving mechanism connected to the driving mechanism, the operation member being connected to the driving member. A brake device that allows input from an input shaft and prohibits input from the drive mechanism output shaft; a ratchet connected to the brake device; and a position that does not engage with a position that engages with the ratchet teeth. A pair of stop members each individually supported by the operation member so as to take a position, a pair of springs respectively biasing the stop member toward a position to be engaged with a common tooth of the ratchet, An abutting portion for selectively abutting against each of the stop members according to the position of the operating member and selectively releasing the stop member from engagement with the ratchet teeth against the urging force of the spring; By operating the operating member, the abutting member selectively abuts on each of the stop members in accordance with the position and the operating direction thereof to release the engaged state, and the brake device And a seat lifter device for a vehicle, wherein the seat is moved up and down by a driving force of the operating member via the driving mechanism. 2. The stop member is tiltably supported by engaging a base end of the stop member with a groove formed in a casing for receiving the ratchet and the stop member, and a tilting range is defined. The vehicle seat lifter device according to claim 1, characterized in that: