JPH0645843U - Lifter - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a lifter in which the front and rear heights of the seat cushion can be adjusted with a single drive motor. [Structure] A drive motor 3 is attached to a drive shaft 2 extending in the front-rear direction.
A clutch sleeve 4 is slidably engaged with the outer periphery of the drive engagement portion 2b of the drive shaft 2 so as to be slidable forward and backward, and front and rear cylindrical male screw members 5 and 6 are rotatably supported on the outer periphery of the drive shaft 2. The male screw members 5 and 6 are formed with driven engaging portions 5a and 6a with which the clutch sleeve 4 can be engaged, and the operating member 13 slides the clutch sleeve 4 back and forth to move the driving engaging portion 2b forward and rearward. Side driven engaging portion 5a (6a)
Are selectively engaged with each other, the female screw 7 (8) is screwed back and forth by the rotation of the male screw member 5 (6), and the front and rear portions of the seat cushion are lifted and lowered by the front and rear lift mechanisms 9 and 10. It is characterized by having done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lifter in which a front height and a rear height of a vehicle seat can be adjusted by one drive motor.

[0002]

[Prior art]

 Recently, in vehicles, various measures have been taken to improve the habitability in the passenger compartment. For example, for vehicle seats, a slider mechanism is generally provided below the seat cushion to adjust the front-rear position of the seat to suit the physique of the occupant. It has been proposed to adjust the front and rear height of the seat by providing a seat to obtain a more comfortable seating feeling. In conventional lifters, a lift mechanism is provided at the front and rear of the seat cushion, and each lift mechanism is driven by a drive motor to adjust the front and rear heights of the seat cushion. It had been.

[0003]

[Problems to be solved by the device]

 However, in the conventional lifter, since the front and rear lift mechanisms are each provided with drive motors, two expensive motors are required, which not only increases the cost but also narrows the space under the seat. The layout was very complicated because two drive motors had to be installed. In view of such problems, it is an object of the present invention to provide a lifter capable of adjusting the front height and the rear height of a seat with one drive motor.

[0004]

[Means for Solving the Problems]

 Therefore, the lifter according to the present invention is a "lifter for adjusting the front and rear heights of a seat cushion, in which a drive shaft extends in the front-rear direction and is rotatably provided, and a drive motor is attached to the drive shaft. The drive shaft is connected to the drive shaft, and a drive engagement portion is formed on the drive shaft. A clutch sleeve is slidably engaged with the outer periphery of the drive engagement portion in the front-rear direction. Is rotatably provided before and after the drive engagement portion, and a driven engagement portion with which the clutch sleeve can engage is formed at the rear end of the front male screw member and the front end of the rear male screw member. Female screws are respectively screwed into the front and rear male screw members, and front and rear lift mechanisms are provided for raising and lowering the front and rear portions of the seat cushion by screwing the female screw of the female screw forward and backward, and the clutch sleeve is operated. It is configured such that the driving engagement portion and the front side or rear side driven engagement portion can be selectively engaged with each other by a member ”.

[0005]

[Action]

 When adjusting the height of the front portion of the seat cushion, the clutch sleeve is slid forward by the operating member to engage the driving engagement portion and the driven engagement portion on the front side. When the drive motor is operated in this state and the drive shaft is rotated or reversely rotated, the rotation or reverse rotation is transmitted to the front male member through the drive engagement portion, the clutch sleeve and the driven engagement portion. The male screw member rotates or reversely rotates, and the female screw engaged with the male screw member is screwed forward and backward, and the front lift mechanism moves up and down the front portion of the seat cushion. When the desired height is reached, the front portion of the seat cushion can be adjusted to the desired height by sliding the clutch sleeve rearward by the operating member to disengage it from the front driven engagement. When adjusting the height of the rear portion of the seat cushion, the clutch sleeve may be slid rearward to engage the drive engagement portion and the rear driven engagement portion.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 to 4 show a lifter according to an embodiment of the present invention. In the figure, a lifter base 1 is mounted on a passenger compartment floor by bolts and nuts, and a drive shaft (drive shaft) 2 is rotatably supported on the lifter base 1 by a bracket 2a. A reduction gear 3a for driving this and a drive motor 3 are attached. A large-diameter drive engaging portion 2b is formed in the center of the drive shaft 2, the outer peripheral surface of the drive engaging portion 2b is serrated, and the inner peripheral surface thereof is serrated. The engaged clutch sleeve 4 is slidably engaged.

Further, cylindrical feed screws (male screw members) 5 and 6 are rotatably mounted on the outer periphery of the drive shaft 2 in the front and rear of the drive engagement portion 2b, and the feed screws 5 and 6 are provided on the front side and the rear side. Reverse screws are used in and, and thrust bearings 5b and 6b are provided between the feed screws (male screw members) 5 and 6 and the drive engaging portion 2b. Small-diameter driven engaging portions 5a, 6a are formed at the rear end of the front side feeding screw 5 and the front end of the rear side feeding screw 6, and serration processing is performed on the outer peripheral surfaces of the driven engaging portions 5a, 6a. When applied, the clutch sleeve 4 can be engaged.

Further, nuts (female threads) 7 and 8 are respectively screwed into the front and rear feed screws 5 and 6, and lift mechanisms 9 and 10 are connected to the nuts 7 and 8. In the front lift mechanism 9, the links 9a and 9b and the L-shaped link 9c are sequentially connected by a connecting pin, the link 9a is connected to the nut 7 by the connecting pin, and the mounting bracket 9d is connected to the link 9b by the connecting pin. The bracket 9d is fixed to the right front part of the frame 11 of the seat cushion, and the L-shaped link 9b is swingably connected to the lifter base 1 by a mounting pin. The action of the links 9a, 9b, 9c causes the nuts to move. The mounting bracket 9d is moved up and down in accordance with the forward and backward movement of the screw 7. Further, in the rear lift mechanism 10, the link 10a and the L-shaped link 10b are connected by a connecting pin, the link 10a is connected to the nut 8 by the connecting pin, and the mounting bracket 10c is connected by the connecting pin to the L-shaped link 10b. The mounting bracket 10c is fixed to the right rear part of the frame 11 of the seat cushion, and the L-shaped link 10b is swingably connected to the lifter base 1 by a mounting pin. 10c can be moved up and down.

On the other hand, a long hole is formed in the right and left side cover 12 of the seat cushion so as to extend in the front-rear direction, and an operation knob 13 is slidably inserted into the long hole. It is supported by the cover 12. Further, a shift fork 14 is attached to the side cover 12 by a screw and an elongated hole so as to be slidable forward and backward, and a bent portion of the tip of the shift fork 14 is elastically connected to the operation knob 13 by front and rear spring members 14a and 14b. Also, the rear end claw portion 14c of the shift fork 14 is connected to the clutch sleeve 4 so as to allow rotation of the sleeve.

Although not shown in the drawings, a similar lifter is also provided on the left side portion of the seat cushion, and the transmission gear of the lifter is connected to the rotary shaft of the drive motor 3 by the drive shaft 3b.

Next, the operation method will be described. When adjusting the front portion of the seat cushion to a high level, first, the drive motor 3 is energized and actuated, the drive force is transmitted to the drive shaft 2 via the reduction gear 3a, and the drive shaft 2 is moved in the predetermined direction. Start to rotate. When the operation knob 13 is held and slid forward, the spring member 14b on the rear side is contracted, and a forward biasing force acts on the shift fork 14. When the drive shaft 2 rotates and the serrations of the clutch sleeve 4 and the front driven engaged portion 5a match, the shift fork 14 and the clutch sleeve 4 slide forward and the drive engaged portion 2b of the drive shaft 2 and the front driven engaged portion 5a slide. The drive engagement portion 5a is engaged, and the rotation of the drive shaft 2 is transmitted to the front side feed screw 5 via the drive engagement portion 2b, the clutch sleeve 4 and the driven engagement portion 5a, and the feed screw 5 is moved to a predetermined position. Rotate in the direction. Then, the nut 7 screwed to the feed screw 5 advances, and the attachment brackets 9d rise by the action of the links 9a, 9b, 9c of the front lift mechanism 9, whereby the front portion of the seat cushion is raised. When the front portion of the seat cushion reaches a desired height, the operation knob 13 is slid rearward, and the shift fork 14 and the clutch sleeve 4 are returned to their original positions. Then, the front driven engagement 5a and the drive shaft 2 are driven. The connection with the engaging portion 2b is released, the rise of the front portion of the seat cushion is stopped, and the front portion of the seat cushion is held at that height by self-locking by screwing the feed screw 5 and the nut 7.

When the rear portion of the seat cushion is adjusted to a high level, the operation knob 13 may be slid rearward as it is, and the rear feed screw 6 is a reverse screw with respect to the front feed screw 5. When the rotation of the shaft 2 is transmitted to the feed screw 7, the nut 8 moves backward and the lift mechanism 10 lifts the rear portion of the seat cushion. Further, when the front height or the rear height of the seat cushion is adjusted to be low, the drive motor 3 may be rotated in the reverse direction. Therefore, the height of both the front part and the rear part of the seat cushion can be adjusted by one drive motor 3, the number of motors can be reduced and the cost can be reduced, and the layout in a narrow space under the seat cushion can be achieved. It will be easy.

[0013]

[Effect of device]

 As described above, according to the lifter of the present invention, the drive shaft is rotated by the drive motor, and the rotation is selected by the clutch sleeve and is transmitted to the front or rear male screw member to lift the front or rear lift. Since the mechanism is driven, the front and rear heights of the seat cushion can be adjusted with one motor, and there is an effect that the cost can be reduced and the layout can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing a lifter according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing the lifter.

FIG. 3 is a cross-sectional view showing a structure near a clutch sleeve in the lifter.

FIG. 4 is a view showing a structure of an operation knob and a shift fork in the lifter.

[Explanation of symbols]

2 Drive Shaft (Drive Shaft) 2b Drive Engagement Part 4 Clutch Sleeve 5 Feed Screw (Male Screw Member) 5a Driven Engagement Part 6 Feed Screw (Male Screw Member) 6a Driven Engagement Part 7 Nut (Female Screw) 8 Nut (Female Screw) ) 9 lift mechanism 10 lift mechanism 13 operation knob (operation member) 14 shift fork (operation member)

Claims (1)

[Scope of utility model registration request] 1. A lifter for adjusting a front height and a rear height of a seat cushion, wherein a drive shaft extends in a front-rear direction and is rotatably provided, and a drive motor is connected to the drive shaft to drive the seat cushion. A drive engagement portion is formed on the shaft, and a clutch sleeve is engaged with the outer periphery of the drive engagement portion so as to be slidable forward and backward, while a cylindrical male screw member is provided on the outer periphery of the drive shaft. The front and rear male screw members are rotatably provided, and a driven engaging portion with which the clutch sleeve can be engaged is formed at the rear end of the front male screw member and the front end of the rear male screw member. A female screw is screwed, front and rear lift mechanisms for raising and lowering a front portion and a rear portion of the seat cushion by screwing back and forth by rotation of the male screw member of the female screw are provided, and the clutch sleeve is driven and engaged by the operating member. A lifter characterized by being configured so that a portion and a driven engagement portion on a front side or a rear side can be selectively engaged.