JP2003341394A - Seat height adjusting device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat height adjusting device which can steplessly adjust the height of a seat and which can lighten a force necessary to operate. <P>SOLUTION: The set height adjusting device 30 provided between a base 11 and a seat frame 12 comprises: first upper and lower links 31a, 31b bent in an 'L' shape; second upper and lower links 32a, 32b bent in the 'L' shape shorter than the links 31a, 31b at the same side as the links 31a, 31b; a first intermediate member 33 for coupling the links 31a, 31b; a second intermediate member 34 for coupling the links 32a, 32b; and an operating shaft 37 passing through the members 33, 34. Female threads 33a, 34a are formed on the members 33, 34, and male threads 37a, 37b engaged with the shaft 37 are formed on the shaft 37. The threads 33a, 37a are formed reversely to the threads 34a, 37b. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the height of a seat in a vehicle such as a construction machine.

[0002]

2. Description of the Related Art A conventional seat of this type is generally height-adjusted by using a cam link mechanism. That is,
The link mechanism is configured so that the rotation of the cam and the vertical movement of the seat are interlocked. The cam has a plurality of locking recesses. The cam is non-rotatable by the engagement of the lock member with one of the locking recesses. By extension, the seat height is fixed. When changing the seat height, first lift the seat. Then, when the cam rotates, the lock member is disengaged from the one locking recess along the cam surface. Then, bring the seat to the desired height and engage the locking member with another locking recess.

[0003]

In the above conventional device,
It is necessary to lift the seat when adjusting the height. However, in general, this type of seat incorporates not only a seat portion and a backrest but also a suspension mechanism and the like, and weighs a dozen to several tens of kilograms. Lifting this can be a daunting task. Moreover, it is only possible to adjust to a plurality of fixed heights such that the locking recesses of the cam and the lock member mesh with each other.

[0004]

In order to solve the above-mentioned problems, the present invention is provided between a base arranged in a vehicle compartment and a seat frame above the base, and the seat frame, and further above it. A height adjusting device for a seat, comprising: (a) a first upper link whose upper end is rotatably connected to the seat frame; and (b) an upper end which is the lower end of the first upper link. A lower link having a lower end rotatably connected to the base and a lower end rotatably connected to the base; and (c) an upper end of the first upper link with respect to the seat frame. A second upper link that is rotatably connected about the same rotation axis as the link and that is shorter than the first upper link;
(D) The upper end is rotatably connected to the lower end of the second upper link, and the lower end is rotatably connected to the base about the same rotation axis as the first lower link. Moreover, the second lower link shorter than the first lower link and (e) the connecting portion between the first upper and lower links,
A first intermediate member provided so as to allow rotation of these links, and (f) a second intermediate member provided at a connecting portion between the second upper and lower links so as to allow rotation of these links. An operation for connecting the first and second intermediate members such that the member and (g) an operation portion is provided at one end, and the first vertical link and the second vertical link are bent on the same side. A shaft, and a hole with a female screw through which the operation shaft is inserted is formed in at least one of the first and second intermediate members, and a male screw that is screwed into the female screw is formed in the operation shaft. It is characterized in that the intermediate member with the female screw is moved along the operation shaft by the rotation operation of the operation section, and by extension, the first and second intermediate members are moved toward and away from each other. According to this characteristic configuration, when the first and second intermediate members approach and separate from each other, the entire first and second vertical links expand and contract vertically, and the seat frame moves up and down. Since the seat is moved up and down with a screw system, the force required for operation can be reduced. Further, the height of the seat can be adjusted steplessly. Furthermore, since the first upper and lower links and the second upper and lower links are bent on the same side, the vertical expansion and contraction amount of the entire first and second upper and lower links can be reduced even if the screwing amount of the operation shaft is small. It can be made large and the seat height can be changed greatly.

Here, the holes with female threads are formed in both the first and second intermediate members, and the female threads of the first and second intermediate members are reverse threads to each other. It is desirable that the operation shaft be formed with two male screws that are mutually opposite screws and that are respectively screwed into these female screws. As a result, the seat height can be further changed with a small screwdriver amount. The hole with the female screw is formed in only one of the first and second intermediate members, and the other intermediate member holds the operating shaft rotatably and is immovably locked along the operating shaft. Good.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a seat device 10 in a vehicle such as a construction machine. The seat device 10 includes a base 11 fixedly or movably installed on the floor of a cabin (vehicle compartment), and a seat frame 12 arranged above the base 11. A seat portion (not shown) of the seat is provided on the seat portion frame 12.

The base 11 and the seat frame 12 are connected by a parallel maintaining mechanism 13. Parallel maintenance mechanism 13
Is composed of a pair of links 13a and 13b provided in the left and right portions of the seat device 10 so as to form an X shape. The links 13a and 13b are rotatably connected to each other at a central intersection, the front end is rotatably connected to the base 11 or the seat frame 12, and the rear end is front and rear to the seat frame 12 or the base 11. It is connected so that it can slide in the direction. As a result, the seat frame 12
However, it can move up and down while maintaining horizontal, that is, parallel to the base 11.

A suspension mechanism 20 is provided below the seat frame 12. Suspension mechanism 2
Reference numeral 0 denotes a generally L-shaped connecting link 21 that is rotatably connected to a bracket 29 on the lower surface of the seat frame 12 and extends forward, and a suspension that is hooked near the rotation fulcrum of the connecting link 21 and extends forward. A spring 22, a locking shaft 23 with a female screw on which the front end of the suspension spring 22 is hooked, a female screw of the shaft 23, and a rotatably mounted front portion of the seat frame 12. Screw shaft 24 and the screw shaft 24. By rotating the operation knob 25 at the front end of the screw shaft 24, the locking shaft 23 can be moved back and forth, and the spring force of the suspension spring 22 can be adjusted.

A hole 21a is formed in the front end portion of the connecting link 21 so as to pass through the end shaft 35a of the connecting shaft 35 described later. The hole 21a is a long hole for allowing the rotation of the link 21 while the seat height adjusting device 30 described later is kept stationary. (Note that even if the hole 21a is formed into a perfect circle, the seat height adjusting device 30 described later can be slightly swung to allow the link 21 to rotate.) As a result, when the vibration is transmitted to the seat device 10. The suspension spring 22 expands and contracts while the connecting link 21 rotates to absorb vibration. Although illustration is omitted, a damper for damping the vibration is also provided between the base 11 and the seat frame 12. In addition, the applicant of the present invention discloses a suspension mechanism in Japanese Patent Application Laid-Open No. 2001-2.
Since the same configuration has already been disclosed in the publication 33091, the detailed description will be given to the publication.

The main part of the present invention will be described. In a vehicle seat device 10, a base 11 and a seat frame 12
A seat height adjusting device 30 is provided between the spaces. The seat height adjusting device 30 includes a pair of left and right first and second seat height adjusting devices.
Link mechanisms 31, 32 and left and right link mechanisms 31, 32
It is provided with connecting shafts 33 to 36 connecting them, and a screw shaft (operation shaft) 37 extending forward and backward and penetrating the connecting shafts (intermediate members) 33 and 34. By rotating the screw shaft 37 to change the distance between the intermediate connecting shafts 33 and 34, the entire link mechanisms 31 and 32 are vertically expanded and contracted.

Further details will be described. The first link mechanism 31 has upper and lower links 31a and 31b, and is bent forward so as to form a V shape. These links 31
The lengths of a and 31b are equal to each other. The upper end of the first upper link 31a is rotatably connected to the end shaft 35a of the upper connecting shaft 35. As mentioned above,
A link 2 for connecting the suspension mechanism 20 to the end shaft 35a.
1 is also connected. As a result, the first upper link 31
a is the seat frame 1 via the suspension mechanism 20.
It is rotatably connected to 2.

The lower end of the first upper link 31a is rotatably connected to the end shaft of the first intermediate connecting shaft 33 (first intermediate member). The upper end of the first lower link 31b is also rotatably connected to the end shaft of the connecting shaft 33. As a result, the upper and lower links 31a and 31b are rotatably connected to each other via the shaft 33. The lower end of the first lower link 31b is rotatably connected to the end shaft of the lower connecting shaft 36. Connecting shaft 36
Are connected to a bracket 39 provided on the upper surface of the base 11. As a result, the first lower link 31b is
It is rotatably connected to the base 11 via the shaft 36 and the bracket 39.

The second link mechanism 32 is the first link mechanism 3.
The upper and lower links 32a and 32b have the same structure as that of the first embodiment.
The upper end of the second upper link 32a is rotatably connected to the end shaft 15a of the upper connecting shaft 15 together with the first upper link 31a, and is rotatably connected to the seat frame 12 via the suspension mechanism 20. Has been done. The lower end of the second upper link 32a has the second intermediate connecting shaft 3
4 (second intermediate member) is rotatably connected to the end shaft. The second lower link 32b is provided on the end axis of the connecting shaft 34.
The upper end of is also rotatably connected. by this,
The upper and lower links 32a and 32b are rotatably connected to each other via a shaft 34. Second lower link 3
The lower end of 2b is rotatably connected to the end axis of the lower connecting shaft 36 together with the first lower link 31b, and is rotatably connected to the base 11 via the bracket 39.

Each link 32a, 3 of the second link mechanism 32
The lengths 2b are the same as each other, and are shorter than the links 31a and 31b of the first link mechanism 31. The second link mechanism 32 including the short links 32a and 32b is bent toward the same side as the first link mechanism 31 including the long links 31a and 31b, that is, toward the front. The second intermediate connecting shaft 34 is replaced by the first intermediate connecting shaft 33 by the short length of the links 32a and 32b.
It is located farther back.

At the middle portion of the first intermediate connecting shaft 33,
A hole 33b penetrating in the front-rear direction is formed. A female screw 33a forming a right-hand screw is engraved on the inner peripheral surface of the through hole 33b. A through hole 34b is formed in the front-rear direction in the middle portion of the second intermediate connecting shaft 34, and a female screw 34a is engraved on the inner peripheral surface thereof. This female screw 34a is
The female screw 33a of the first intermediate connecting shaft 33 is a reverse screw, that is, a left screw.

A screw shaft 37 is inserted through the through holes 33b and 34b of the intermediate connecting shafts 33 and 34.
The screw shaft 37 is formed with two male screws 37a and 37b which are separated from each other in the axial direction (front-back direction). The male screw 37a on the front side forms a right screw and is screwed into the female screw 33a of the first intermediate coupling shaft 33, and the male screw 17b on the rear side is formed.
Has a left-hand thread and is screwed into the female thread 34a of the second intermediate coupling shaft 34. As a result, the first and second intermediate connecting shafts 33 and 34 are connected to each other via the screw shaft 37, and by extension, the first and second link mechanisms 31 and 32 are connected to each other. The pitch of the right screws 33a and 37a and the pitch of the left screws 34a and 37b are the same, but they may be different. The female screw 33a of the first intermediate connecting shaft 33 and the screw shaft 3 screwed to the female screw 33a.
7, the male screw 37a is a left screw, and the female screw 34a of the second intermediate connecting shaft 34 and the screw shaft 37 that is screwed together
The male screw 17b may be a right screw.

An operating knob 38 (operating portion) is provided at a front end portion (one end portion) of the screw shaft 37. By turning the screw shaft 37 with this operation knob 38,
The height of the seat can be adjusted.

That is, as shown in FIG. 3, when the operation knob 38 is rotated clockwise, the first position with respect to the screw shaft 37 is changed.
The intermediate connecting shaft 33 relatively moves toward the operation knob 38 side (front side), whereas the second intermediate connecting shaft 34 relatively moves toward the side away from the operation knob 38 (rearward), and the separation distance between the shafts 33, 34 is increased. Grows larger. As a result, the links 31a, 31b, 32a, 32b are erected and the entire link mechanisms 31, 32 extend vertically. As a result, it is possible to raise the position of the seat frame 12, and thus the seat above it.

On the other hand, as shown in FIG. 4, the operating knob 38
When the screw is rotated counterclockwise, the first intermediate connecting shaft 33 moves toward the side (rearward) away from the operating knob 38 with respect to the screw shaft 37, while the second intermediate connecting shaft 34 moves toward the operating knob 38 side (forward). ) To both shafts 3
3,34 approach. By this, the links 31a, 3
1b, 32a, 32b fall, and the link mechanisms 31, 32 as a whole contract up and down. As a result, it is possible to lower the position of the seat frame 12 and thus the seat above it.

According to this seat height adjusting device 30, since the seat is vertically moved by the screw system, the height of the seat can be adjusted steplessly. In addition, the force required for operation can be reduced, and there is no need to directly lift a seat of several tens to several tens of kilometers. Furthermore, screw shaft 3
7. Since both the first and second intermediate connecting shafts 33 and 34 are meshed with each other by reverse screws, it is possible to obtain a large seat height change with a smaller screwing amount than when only one of them is meshed with a screw. You can Moreover, since the first and second link mechanisms 31 and 32 are bent on the same side,
The link mechanism 3 with respect to the amount of change in the distance between the intermediate coupling shafts 33 and 34, as compared with the case where the link mechanism 3 is bent to the opposite side.
It is possible to increase the vertical expansion / contraction amount of 1, 32. As a result, the seat can be moved up and down more greatly by simply rotating the screw shaft 37 slightly.

The present invention is not limited to the above embodiment, but various modifications can be made. For example,
A female screw is formed on only one of the first and second intermediate coupling shafts 33, 34, and a locking portion for locking the screw shaft 37 so that the screw shaft 37 is relatively immovable (allows rotation) in the axial direction is formed on the other side. It may have been done. The lower end of the first upper link and the first
The rotation axes of the upper ends of the lower links do not have to be on the same line, and may be arranged vertically apart, for example, via the first intermediate member. The rotation axes of the lower end portion of the second upper link and the upper end portion of the second lower link are similar to each other, and may be arranged vertically apart from each other, for example, via the second intermediate member. The first and second intermediate members may be provided at the connecting portions of the upper and lower links so as to allow the rotation of each link.

[0022]

As described above, according to the present invention,
Since the seat is moved up and down by the screw method,
The force required for operation can be reduced. Further, the height of the seat can be adjusted steplessly. Further, since the first upper and lower links and the second upper and lower links are bent on the same side, the seat height can be greatly changed even when the screwing amount of the operation shaft is small.

Both the first and second intermediate members are formed with female screws having mutually opposite threads, and the operation shaft is provided with two male screws having mutually opposite threads which are respectively engaged with these female threads. The seat height can be further changed with a small amount of screwdriver.

[Brief description of drawings]

FIG. 1 shows a vehicle seat device according to an embodiment of the present invention,
It is a side view shown in the state where a seat is located in an almost middle height.

FIG. 2 is an exploded perspective view of the seat device.

FIG. 3 is a side view of the seat device in a state in which the seat is positioned high.

FIG. 4 is a side view of the seat device with the seat positioned low.

[Explanation of symbols]

10 Seat Device 11 Base 12 Seat Frame 30 Seat Height Adjusting Device 31 First Link Mechanism 31a First Upper Link 31b First Lower Link 32 Second Link Mechanism 32a Second Upper Link 32b Second Lower Link 33 First Intermediate Connection Shaft (first intermediate member) 33a Female screw (right screw) 33b Hole 34 Second intermediate connecting shaft (second intermediate member) 34a Female screw (left screw) 34b Hole 35 Upper connecting shaft (first and second upper link each other) Same rotation axis line) 36 lower connecting shaft (same rotation axis line between the first and second lower links) 37 screw shaft (operation shaft) 37a male screw (right screw) 37b male screw (left screw) 38 operation knob ( Operation part)

Claims (2)

[Claims] 1. A device which is provided between a base arranged in a passenger compartment and a seat frame above the base, and which adjusts the height of the seat frame, and thus the seat thereon, comprising: (a) an upper end portion; Is rotatably connected to the seat frame, and (b) the upper end is rotatably connected to the lower end of the first upper link, and the lower end is A first lower link rotatably connected to the base; and (c) an upper end portion rotatably connected to the seat frame about the same rotation axis as the first upper link, and A second upper link shorter than the first upper link,
(D) The upper end is rotatably connected to the lower end of the second upper link, and the lower end is rotatably connected to the base about the same rotation axis as the first lower link. Moreover, the second lower link shorter than the first lower link and (e) the connecting portion between the first upper and lower links,
A first intermediate member provided so as to allow rotation of these links, and (f) a second intermediate member provided at a connecting portion between the second upper and lower links so as to allow rotation of these links. An operation for connecting the first and second intermediate members such that the member and (g) an operation portion is provided at one end, and the first vertical link and the second vertical link are bent on the same side. A shaft, and a hole with a female screw through which the operation shaft is inserted is formed in at least one of the first and second intermediate members, and a male screw that is screwed into the female screw is formed in the operation shaft. The intermediate member with the female screw is moved along the operation shaft by the rotation operation of the operation portion, and the first and second intermediate members are moved toward and away from each other. height Section apparatus. 2. The holes with female threads are formed in both of the first and second intermediate members, and the female threads of the first and second intermediate members are reverse threads to each other, and The shaft is screwed into these female threads 2
2. The seat height adjusting device for a vehicle according to claim 1, wherein three male screws forming mutually opposite screws are formed.