JP3696574B2 - Vehicle seat height adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for adjusting the height of a seat in a vehicle such as a construction machine.
[0002]
[Prior art]
Conventional seats of this type are generally adjusted in height 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 made non-rotatable by the locking member meshing with one of these locking recesses. As a result, the seat height is fixed. When changing the seat height, the seat is first lifted. Then, when the cam rotates, the lock member comes off from the one locking recess along the cam surface. Then, the seat is brought to a desired height, and the lock member is engaged with another locking recess.
[0003]
[Problems to be solved by the invention]
In the above conventional apparatus, 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 has a weight of tens to several tens of kilograms. Lifting it is a daunting task. In addition, it can be adjusted only to a plurality of fixed heights such that the locking recesses of the cam and the locking member are engaged with each other.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is an apparatus that is provided between a base arranged in a passenger compartment and a seat frame above it, and adjusts the height of the seat frame and thus the seat above it. (A) a first upper link whose upper end is rotatably connected to the seat frame; and (b) an upper end is rotatably connected to the lower end of the first upper link. A first lower link having a lower end rotatably connected to the base; and (c) an upper end rotating about the same rotation axis as the first upper link with respect to the seat frame. A second upper link shorter than the first upper link, and (d) an upper end portion rotatably connected to a lower end portion of the second upper link, and a lower end portion connected to the base. Rotate around the same rotation axis as the first lower link And a second lower link that is shorter than the first lower link, and (e) a first intermediate link that is provided at a connecting portion between the first upper and lower links so as to allow rotation of the links. A member, (f) a second intermediate member provided at a connecting portion between the second upper and lower links so as to allow rotation of the links, and (g) an operation portion provided at one end, An operation shaft that connects the first and second intermediate members such that the first vertical link and the second vertical link are bent on the same side, and at least one of the first and second intermediate members Is formed with a female screw hole through which the operation shaft is passed, and the operation shaft is formed with a male screw that is screwed into the female screw. The intermediate member is It is moved along the shift, and thus the first, each other the second intermediate member is approaching, characterized in that it is spaced. According to this characteristic configuration, the first and second intermediate members are moved up and down by the approach and separation of the first and second intermediate members, and the seat frame moves up and down. Since the seat is moved up and down by a screw method, the force required for operation can be reduced. In addition, the seat height can be adjusted steplessly. Further, since the first upper and lower links and the second upper and lower links are bent to the same side, even if the screwing amount of the operation shaft is small, the vertical expansion amount of the entire first and second vertical links can be reduced. The seat height can be greatly changed.
[0005]
Here, both of the first and second intermediate members are formed with holes with female threads, and the female threads of the first and second intermediate members are reverse threads, and the operation shaft In this case, it is desirable that two male screws that are opposite to each other and that are respectively screwed into these female screws are formed. As a result, the seat height can be changed more greatly with a small screwdriver amount.
The hole with the female thread is formed in only one of the first and second intermediate members, and the other intermediate member holds the operation shaft rotatably and is locked so as not to move along the operation shaft. Also good.
[0006]
DETAILED DESCRIPTION OF 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 that is fixed or movable on the floor of a cabin (cabinet), and a seat frame 12 that is disposed above the base 11. A seat portion (not shown) of the seat is provided on the seat frame 12.
[0007]
The base 11 and the seat frame 12 are connected by a parallel maintaining mechanism 13. The parallel maintaining 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 slidably connected in the direction. As a result, the seat frame 12 can move up and down while maintaining horizontal, that is, parallel to the base 11.
[0008]
A suspension mechanism 20 is provided below the seat frame 12. The suspension mechanism 20 is rotatably connected to a bracket 29 on the lower surface of the seat frame 12 and extends forward, and is hooked in the vicinity of a rotation fulcrum of the connection link 21 and forward. A suspension spring 22 that extends, a locking shaft 23 with a female thread on which the front end of the suspension spring 22 is hooked, and a screw threaded into the female thread of the shaft 23 and rotatable to the front side of the seat frame 12 And a screw shaft 24 attached to the head. By turning an 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.
[0009]
A hole 21 a that is passed through an end shaft 35 a of a connecting shaft 35 that will be described later is formed in the front end portion of the connecting link 21. This hole 21a is a long hole in order to allow rotation of the connecting link 21 while the seat height adjusting device 30 described below is stationary. (Note that even if the hole 21a is made into a perfect circle, the rotation of the link 21 can be permitted by slightly swinging the seat height adjusting device 30 described later.) Thus, when vibration is transmitted to the seat device 10. The suspension link 22 can be expanded and contracted to absorb vibration while the link 21 rotates. Although not shown, a damper for attenuating vibration is also provided between the base 11 and the seat frame 12. Since the applicant has already disclosed the same configuration in Japanese Patent Application Laid-Open No. 2001-233091 regarding the suspension mechanism, the detailed description will be left to that document.
[0010]
The main part of the present invention will be described.
In the vehicle seat device 10, a seat height adjusting device 30 is provided between the base 11 and the seat frame 12. The seat height adjusting device 30 includes first and second link mechanisms 31 and 32 that form a pair of left and right, connection shafts 33 to 36 that connect the left and right link mechanisms 31 and 32, and a connection shaft (intermediate). And a screw shaft (operation shaft) 37 that penetrates the members 33 and 34. By rotating the screw shaft 37 and changing the distance between the intermediate connecting shafts 33 and 34, the entire link mechanisms 31 and 32 are vertically expanded and contracted.
[0011]
Further details will be described.
The first link mechanism 31 has upper and lower links 31 a and 31 b and is bent forward so as to form a “<” shape. The lengths of these links 31a and 31b are equal to each other. The upper end portion of the first upper link 31 a is rotatably connected to the end shaft 35 a of the upper connecting shaft 35. As described above, the connecting link 21 of the suspension mechanism 20 is also connected to the end shaft 35a. As a result, the first upper link 31 a is rotatably connected to the seat frame 12 via the suspension mechanism 20.
[0012]
The lower end portion of the first upper link 31a is rotatably connected to the end shaft of the first intermediate connection shaft 33 (first intermediate member). The upper end portion of the first lower link 31b is also rotatably connected to the end shaft of the connecting shaft 33. Thus, the upper and lower links 31 a and 31 b are connected to each other via the shaft 33 so as to be rotatable. The lower end portion of the first lower link 31 b is rotatably connected to the end shaft of the lower connection shaft 36. The connection shaft 36 is connected to a bracket 39 provided on the upper surface of the base 11. As a result, the first lower link 31 b is rotatably connected to the base 11 via the shaft 36 and the bracket 39.
[0013]
Similar to the first link mechanism 31, the second link mechanism 32 has upper and lower links 32a and 32b. The upper end portion 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 eventually connected to the seat frame 12 via the suspension mechanism 20. Has been. The lower end portion of the second upper link 32a is rotatably connected to the end shaft of the second intermediate connecting shaft 34 (second intermediate member). The upper end portion of the second lower link 32b is also rotatably connected to the end shaft of the connecting shaft 34. Thus, the upper and lower links 32 a and 32 b are connected to each other via the shaft 34 so as to be rotatable. The lower end portion of the second lower link 32b is rotatably connected to the end shaft of the lower connecting shaft 36 together with the first lower link 31b, and thus is rotatably connected to the base 11 via the bracket 39.
[0014]
The links 32 a and 32 b of the second link mechanism 32 have the same length and are shorter than the links 31 a and 31 b 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, forward. Then, the second intermediate connecting shaft 34 is positioned rearward from the first intermediate connecting shaft 33 by the short amount of the links 32a and 32b.
[0015]
A hole 33b penetrating in the front-rear direction is formed in an intermediate portion of the first intermediate connecting shaft 33. A female screw 33a forming a right-hand thread 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 intermediate portion of the second intermediate connecting shaft 34, and a female screw 34a is engraved on the inner peripheral surface thereof. The female screw 34a is a reverse screw, that is, a left-hand screw with respect to the female screw 33a of the first intermediate connecting shaft 33.
[0016]
A screw shaft 37 is passed through the through holes 33b, 34b of the intermediate connecting shafts 33, 34. Two male screws 37a and 37b are formed on the screw shaft 37 apart from each other in the axial direction (front-rear direction). The front male screw 37a is screwed to the female screw 33a of the first intermediate connecting shaft 33 with a right screw, and the rear male screw 17b is a female screw 34a of the second intermediate connecting shaft 34 with a left screw. Are screwed together. Thus, the first and second intermediate connection shafts 33 and 34 and the first and second link mechanisms 31 and 32 are connected to each other via the screw shaft 37.
The pitch of the right screws 33a and 37a and the pitch of the left screws 34a and 37b are the same, but may be different. The female screw 33a of the first intermediate connecting shaft 33 and the male screw 37a of the screw shaft 37 screwed to the left screw are used as the left screw, and the female screw 34a of the second intermediate connecting shaft 34 and the male screw 17b of the screw shaft 37 screwed to the female screw 34b are used. A right-hand thread may be used.
[0017]
An operation knob 38 (operation unit) is provided at the front end (one end) of the screw shaft 37. The seat height can be adjusted by turning the screw shaft 37 with the operation knob 38.
[0018]
That is, as shown in FIG. 3, when the operation knob 38 is rotated clockwise, the first intermediate connecting shaft 33 moves relative to the screw knob 37 toward the operation knob 38 (forward), whereas the second The intermediate coupling shaft 34 moves relative to the side away from the operation knob 38 (backward), and the distance between the shafts 33 and 34 increases. Thereby, each link 31a, 31b, 32a, 32b stands up, and the whole link mechanism 31, 32 extends up and down. As a result, the position of the seat frame 12 and thus the seat above it can be increased.
[0019]
On the other hand, as shown in FIG. 4, when the operation knob 38 is turned counterclockwise, the first intermediate connecting shaft 33 moves to the side away from the operation knob 38 (rearward) with respect to the screw shaft 37. The intermediate connecting shaft 34 moves to the operation knob 38 side (forward), and the shafts 33 and 34 approach each other. As a result, the links 31a, 31b, 32a, and 32b fall down, and the entire link mechanisms 31 and 32 contract vertically. As a result, the position of the seat frame 12 and thus the seat above it can be lowered.
[0020]
According to the seat height adjusting device 30, the seat is moved up and down by a screw method, so that 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 lift a seat of several tens to several tens of kilometers directly. Further, since both the first and second intermediate connecting shafts 33 and 34 are engaged with the screw shaft 37 by making reverse screws, the seat height is large with a smaller screw-turn amount than when only one of them is engaged with the screw. Change can be obtained. In addition, since the first and second link mechanisms 31 and 32 are bent to the same side, the link mechanism 31 with respect to the amount of change in the distance between the intermediate connecting shafts 33 and 34, compared to the case of bending to the opposite side. , 32 can be increased. As a result, the seat can be moved up and down by a slight rotation of the screw shaft 37.
[0021]
The present invention is not limited to the above embodiment, and various modifications can be made. For example, a female thread is formed only on one of the first and second intermediate coupling shafts 33 and 34, and on the other side, a locking portion that locks the screw shaft 37 so as not to be relatively movable (rotation is allowed) in the axial direction. May be formed.
The rotation shafts of the lower end portion of the first upper link and the upper end portion of the first lower link do not need to be on the same line, and may be arranged, for example, vertically apart via a first intermediate member. The same applies to the rotation shafts of the lower end portion of the second upper link and the upper end portion of the second lower link. The 1st, 2nd intermediate member should just be provided in the connection part of an up-and-down link so that rotation of each link may be permitted.
[0022]
【The invention's effect】
As described above, according to the present invention, since the seat is moved up and down by the screw method, the force required for the operation can be reduced. In addition, the seat height can be adjusted steplessly. Furthermore, since the first upper and lower links and the second upper and lower links are bent to the same side, the seat height can be greatly changed even if the screwing amount of the operation shaft is small.
[0023]
Both the first and second intermediate members are formed with internal threads that are reversely threaded, and the operation shaft is formed with two externally threaded male threads that are respectively screwed into these internal threads, thereby reducing the size of the operation shaft. The seat height can be changed more greatly by the amount of screwing.
[Brief description of the drawings]
FIG. 1 is a side view showing a seat device for a vehicle according to an embodiment of the present invention in a state where a seat is positioned at an almost intermediate height.
FIG. 2 is an exploded perspective view of the seat device.
FIG. 3 is a side view of the seat device with the seat positioned high.
FIG. 4 is a side view of the seat device in a state where the seat is positioned low.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Seat apparatus 11 Base 12 Seat frame 30 Seat height adjustment apparatus 31 1st link mechanism 31a 1st upper link 31b 1st lower link 32 2nd link mechanism 32a 2nd upper link 32b 2nd lower link 33 1st intermediate connection Shaft (first intermediate member)
33a Female thread (right thread)
33b Hole 34 Second intermediate connecting shaft (second intermediate member)
34a Female thread (left thread)
34b Hole 35 Upper connecting shaft (the same rotation axis of the first and second upper links)
36 Lower connection shaft (same axis of rotation of the first and second lower links)
37 Screw shaft (operation shaft)
37a Male thread (right thread)
37b Male thread (left thread)
38 Operation knob (operation unit)

Claims (2)

A device that is provided between a base arranged in a passenger compartment and a seat frame above it, and adjusts the height of the seat frame and thus the seat above it,
(A) a first upper link whose upper end is rotatably connected to the seat frame;
(B) a first lower link whose upper end is rotatably connected to the lower end of the first upper link, and whose lower end is rotatably connected to the base;
(C) a second upper link whose upper end is rotatably connected to the seat frame around the same rotational axis as the first upper link, and shorter than the first upper link;
(D) The upper end portion is rotatably connected to the lower end portion of the second upper link, and the lower end portion is rotatably connected to the base around the same rotation axis as the first lower link. And a second lower link shorter than the first lower link,
(E) a first intermediate member provided at a connecting portion between the first upper and lower links so as to allow rotation of the links;
(F) a second intermediate member provided at a connecting portion between the second upper and lower links so as to allow rotation of the links;
(G) An operation shaft is provided at one end, and an operation shaft that connects the first and second intermediate members such that the first vertical link and the second vertical link are bent to the same side. And at least one of the first and second intermediate members is formed with a female threaded hole through which the operation shaft is passed, and the operation shaft is formed with a male thread that is screwed into the female thread. The seat height adjustment of the vehicle is characterized in that 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. apparatus. Both the first and second intermediate members are formed with holes with female threads, and the female threads of the first and second intermediate members are mutually reverse threads. 2. The seat height adjusting device for a vehicle according to claim 1, wherein two male screws that are reversely screwed with each other are formed.

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