JP2020040589A - Seating detection device for seat and seat suspension - Google Patents

Abstract

To provide a seating detection device that is able to stably detect seating regardless of the position of an operator.SOLUTION: A seating detection device for a seat comprises a first rail, a first slider, a first seating switch, and a first elastic member. The first rail extends in a slide direction. The first slider is placed on the first rail in a height direction and slidable over the first rail in the sliding direction. The first seating switch is placed on the first slider in the height direction and has a first switch button for switching on/off by moving along substantially in the height direction. The first elastic member has a first recessed portion and placed on the first seating switch and the first slider in the height direction such that the first switch button is inserted in the first recessed portion. A seat is placed in a higher position in a height direction.SELECTED DRAWING: Figure 15

Description

  The technology disclosed in the present application relates to a seat occupancy detection device and a seat suspension.

  BACKGROUND ART A seating detection device disclosed in Patent Document 1 is known as a seating detection device for a seat in a work vehicle or the like. The seating detection device can detect the seating state of the driver's seat with the lifting function.

JP 2005-299316 A

  An object of the technology disclosed in the present application is to provide, for example, a seating detection device that can stably detect seating regardless of the posture of an operator.

  According to a first aspect of the present invention, a seat occupancy detecting device includes a first rail, a first slider, a first occupant switch, and a first elastic member. The first rail extends in the sliding direction. The first slider is mounted on the first rail in the height direction, and is slidable on the first rail in the sliding direction. The first seating switch is mounted on the first slider in the height direction and has a first switch button for switching on and off by moving substantially along the height direction. The first elastic member has a first concave portion, and is mounted on the first seating switch and the first slider in the height direction so that the first switch button is inserted into the first concave portion, and in the height direction. The sheet is placed on the upper side.

  According to the second aspect of the present invention, a seat suspension includes the seating detection device according to the first aspect of the present invention, a pedestal, a seat table, a first link, a second link, and an elastic member. The pedestal has a first rotation axis extending in a width direction substantially perpendicular to the sliding direction, and a first rotation axis substantially parallel to the first rotation axis and a first distance away from the first rotation axis. And a pedestal hook that is provided closer to the first rotation axis than the second rotation axis in the sliding direction. A seat pivot substantially parallel to the first pivot axis; and a seat pivot substantially parallel to the third pivot axis and spaced a first distance away from the third pivot axis. And a fourth rotation axis. The seat switch is mounted on the seat base such that the first seat switch is closer to the fourth rotation axis than the third rotation axis in the sliding direction. The first link connects the first rotation axis and the third rotation axis so that the distance between the first rotation axis and the third rotation axis is a second distance, and the first rotation axis. And a third rotation axis. The second link connects the second rotation axis and the fourth rotation axis such that the distance between the second rotation axis and the fourth rotation axis is the second distance, and forms the second rotation axis. And the fourth rotation axis. The elastic member is hooked on the pedestal hook and the second link, and draws the fourth rotation shaft toward the pedestal hook.

  According to a third aspect of the present invention, a seat suspension includes a pedestal, a seat base, a first link, a second link, a link hook, and a compression spring. The pedestal includes a first pivot axis and a second pivot axis substantially parallel to the first pivot axis and spaced a first distance away from the first pivot axis. The pedestal has a pedestal hook provided closer to the first rotation axis than to the second rotation axis in a seat longitudinal direction substantially perpendicular to both the first rotation axis and the second rotation axis. A seat pivot substantially parallel to the first pivot axis; and a seat pivot substantially parallel to the third pivot axis and spaced a first distance away from the third pivot axis. And a fourth rotation axis. The seat is mounted on the seat base such that the backrest of the seat is located closer to the fourth rotation axis than to the third rotation axis in the seat front-rear direction. The first link connects the first rotation axis and the third rotation axis such that a distance between the first rotation axis and the third rotation axis is a second distance, and performs a first rotation. It is rotatable with respect to the axis and the third rotation axis. The second link connects the second rotation axis and the fourth rotation axis such that the distance between the second rotation axis and the fourth rotation axis is the second distance, and forms the second rotation axis. And the fourth rotation axis. The link hook is provided on the second link. The compression spring is hung on the pedestal hook and the link hook and pushes the link hook away from the pedestal hook. The link hook is arranged such that as the compression spring contracts, the first angle between the direction in which the compression spring presses and the rotation direction of the link hook increases.

  According to the technology disclosed in the present application, for example, it is possible to provide a seating detection device that can stably detect seating regardless of the posture of an operator.

FIG. 1 is a side view of the work vehicle according to the embodiment. FIG. 2 is a plan view of the cab of the work vehicle. FIG. 3 is a side view of the seat and the seat suspension according to the first embodiment. FIG. 4 is a top view of the seat suspension of FIG. 3 from which a seat bracket and a seat base are removed. FIG. 5 is a sectional view of the seat and the seat suspension of FIG. 3 along line VV in FIG. FIG. 6 is a rear view of the seat and the seat suspension of FIG. FIG. 7 is a top view of the seat suspension of FIG. 3 with the seat bracket removed. FIG. 8 is a top view of the seat suspension of FIG. FIG. 9 is a schematic explanatory view showing the movable range of the seat suspension according to the first embodiment. FIG. 10 is a diagram illustrating a relationship between a seat sinking amount and a sheet load. FIG. 11 is a diagram illustrating the relationship between the sheet sinking amount and the sheet load in the comparative example. FIG. 12 is a schematic sectional view of the seat suspension according to the second embodiment. FIG. 13 is a schematic sectional view of the seat suspension according to the third embodiment. FIG. 14 is a side view of the seat and the seat suspension according to the fourth embodiment. FIG. 15 is a rear view of the seat and the seat suspension of FIG. FIG. 16 is a top view of the seat suspension of FIG.

Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same reference numerals indicate corresponding or identical configurations.
[First Embodiment]
<Overall configuration>
FIG. 1 is a side view of a work vehicle 1 according to the embodiment. The work vehicle 1 is, for example, an agricultural tractor. The work vehicle 1 includes a body frame 2, running wheels 3 and 4, and a cab 5. The work vehicle 1 is preferably a four-wheel drive vehicle, and travels when four traveling wheels 3 and 4 are rotationally driven.

  In the embodiment according to the present application, the front-rear direction means the front-rear direction as seen from an operator sitting on the seat 58 of the cab 5. The lateral direction and the lateral direction mean the lateral direction and the lateral direction, respectively, as viewed from the operator. The up-down direction means the up-down direction viewed from the operator. In other words, these directions correspond to the directions viewed from the operator with the back of the operator placed on the backrest 59 of the seat 58. The front / rear / left / right (horizontal) / height directions of the work vehicle 1 and the seat 58 correspond to the front / rear / left / right (horizontal) / up / down directions as seen from the operator.

  The body frame 2 has a front frame 2a and a rear frame 2b. The engine 6 is mounted on the front frame 2a. The cab 5 and the transmission case 8 are mounted on the rear frame 2b. The transmission case 8 includes a traveling transmission and the like for transmitting the driving force from the engine 6 to the traveling wheels 3 and 4. The transmission case 8 further includes a transmission for a working device, a clutch, and the like for distributing power from the engine 6 to a working device (not shown) separately from the traveling wheels 3 and 4. A power transmission system including a transmission and a clutch for the working device is referred to as a work transmission system.

The work vehicle 1 further includes a pair of lift arms 10, a PTO shaft 11, and a traction device 12. One lift arm 10 is provided on each of the left and right sides of the work vehicle 1. The lift arm 10 can swing up and down by the operation of a hydraulic lifting cylinder that forms a part of a work transmission system. The PTO shaft 11 is an output shaft for the power of the work transmission system. A link mechanism (not shown) is connected to the pair of lift arms 10, and the PTO shaft 11 is powered by a working device (not shown) such as a rotary tiller connected to the link mechanism. A transmission shaft or the like for transmitting power is connected. The towing device 12 is a device for connecting a carrier (not shown) for transportation to the rear of the work vehicle 1 and transporting the same.
<Internal configuration of driver's cab>
The cab 5 is a space surrounded by a cabin frame 51, a windshield 52, a door panel 53, a side window 54, a rear window 55, and a roof portion 56. The cabin frame 51 supports a windshield 52, a door panel 53, a side window 54, a rear window 55, and a roof portion 56. The roof portion 56 has a storage space in which an air conditioner, a wireless communication device, and the like can be stored. FIG. 2 is a plan view of the inside of the cab 5 excluding the roof portion 56. The work vehicle 1 includes a floor panel 57 and a seat 58 in the cab 5. The floor panel 57 constitutes the floor of the cab 5. A seat 58 is arranged behind the floor panel 57. The seat 58 is mounted on a seat suspension 20 (see FIG. 3) described in detail below. The windshield 52 is transparent and forms the front surface of the cab 5. The door panels 53 are transparent and provided on both left and right sides of the cab 5. The door panel 53 can be opened and closed outward. Here, “openable and closable outward” means that it can be freely opened and closed so as to be separated from the floor panel 57 and the seat 58. The side windows 54 are transparent and are provided on both left and right sides of the cab 5 and behind the door panel 53. The side window 54 can also be opened and closed outward. The rear window 55 is transparent and forms the rear surface of the cab 5. The rear window 55 can also be opened and closed outward. Further, as shown in FIG. 2, the work vehicle 1 includes a display 60, a steering wheel 61, a clutch pedal 62, a brake pedal 63, a speed control pedal 64, and the like, behind the windshield 52 and in front of the seat 58.

  The work vehicle 1 includes a first operation lever 65, a second operation lever 66, and a third operation lever 67 on the left side of the seat 58 in the cab 5. The first operation lever 65 is preferably a shuttle shift lever. The first operation lever 65 is swingable in the front-rear direction. When the first operation lever 65 is tilted forward, the work vehicle 1 moves forward. When the first operation lever 65 is tilted backward, the work vehicle 1 moves backward. The second operation lever 66 is preferably a lever for setting whether or not to drive the front wheel (running wheel 3). The second operation lever 66 is disposed forward of the first operation lever 65. The second operation lever 66 can swing back and forth. When the second operation lever 66 is tilted forward, for example, the front wheels 3 are driven, and the work vehicle 1 runs with four wheels ("4WD ON"). When the second operation lever 66 is tilted backward, for example, only the rear wheels 4 are driven, and the work vehicle 1 travels by two-wheel drive ("4WD OFF"). The four-wheel drive may be turned off when the second operation lever 66 is tilted forward, and the four-wheel drive may be turned on when the second operation lever 66 is tilted backward. The third operation lever 67 is a speed stage switching lever. There are preferably three types of speed stages, LOW, MIDDLE, and HIGH, which are used when traveling at low speed, medium speed, and high speed, respectively. The third operation lever 67 is slidable in the front-rear direction. When the third operation lever 67 slides forward, the speed gear is switched to, for example, LOW. When the third operation lever 67 slides to the center, the speed gear is switched to, for example, MIDDLE. When the third operation lever 67 slides backward, the speed gear is switched to, for example, HIGH. When the third operation lever 67 slides forward, the speed stage may be switched to HIGH, and when the third operation lever 67 slides backward, the speed stage may be switched to, for example, LOW. The second and third operation levers 66 and 67 are mechanically connected to a traveling transmission or the like inside the transmission case 8. Note that the second and third operation levers 66 and 67 may be electrically connected to a traveling transmission or the like inside the transmission case 8 via a switch or the like.

The work vehicle 1 includes a fourth operation lever 68, a fifth operation lever 69, a sixth operation lever 70, and a seventh operation lever group 71 on the right side of the seat 58 in the cab 5. The fourth operation lever 68 is an operation lever of a work transmission system (output of the PTO shaft 11). The fifth operation lever 69 is an operation lever for operating a working device (not shown) in a vertical direction. The fifth operation lever 69 can swing back and forth. When the fifth operation lever 69 is tilted backward, for example, the lift arm 10 moves the working device upward. When the fifth operation lever 69 is tilted forward, for example, the lift arm 10 moves the working device downward. When the fifth operation lever 69 is tilted backward, the lift arm 10 moves the work device downward, and when the fifth operation lever 69 is tilted forward, the lift arm 10 moves the work device upward. May be moved. The sixth operating lever 70 controls the lift arm 10 so that the traction force of the working device is made as constant as possible by raising and lowering the working device according to the unevenness and hardness of the soil (making the working device follow changes in the soil). This is a lever for setting whether to perform the operation or to control the lift arm 10 so that the working device does not follow such a change in the soil. The sixth operation lever 70 can swing back and forth. When the sixth operation lever 70 is tilted backward, for example, the work vehicle 1 controls the lift arm 10 so that the work device follows the change in soil. When the sixth operation lever 70 is tilted forward, for example, the work vehicle 1 controls the lift arm 10 so that the work device does not follow changes in the soil. The work vehicle 1 can also control the lift arm 10 so that the work device is lifted from the soil, and the sixth operating lever can be tilted further forward as compared with a case where the work device is not made to follow changes in the soil. In this case, the work vehicle 1 may control the lift arm 10 so that the work device is lifted from the soil. Each lever of the seventh operation lever group 71 is a lever for directly controlling each lifting cylinder of the lift arm 10.
<Details of seat suspension>
Referring to FIG. 3, the seat suspension 20 includes a pedestal 21, a seat table 31, a first link 41, and a second link 43. The pedestal 21 is placed on the cabin frame 51. The first link 41 and the second link 43 form a parallel link, and are rotatably connected to the pedestal 21 and the seat table 31, respectively. The seat base 31 includes a z-bar (z bar) 32 to which the first link 41 and the second link 43 are connected to the web. The seat suspension 20 further includes a rail 34, a slider 35, a bracket attachment 36, a pin 37, a seat bracket 38, a cushion fitting 39, and a seat cushion rubber 40.

The rail 34 is provided on a lower flange of the Z-bar 32 and extends in the sliding direction Ds. In the present embodiment, the sliding direction Ds coincides with the front-rear direction of the seat 38 (seat front-rear direction D _L ). However, the sliding direction Ds does not need to coincide with the front-back direction of the seat 38 (the seat front-back direction D _L ). The slider 35 is mounted on the rail 34 and is slidable on the rail 34 in the sliding direction Ds. In the present embodiment, the slider 35 is mounted on the rail 34 in the height direction D _H (height direction D _H ) of the seat suspension 20. However, the slider 35 may be mounted on the rail 34 in another direction perpendicular to the sliding direction Ds.

Bracket attachment 36 is mounted on the leading end in the longitudinal direction D _L of the slider 35 (one end of the sliding direction Ds of the slider 35). The seat bracket 38 is connected to the bracket attachment 36 via a pin 37. The seat bracket 38 is rotatable around the central axis _{AXS of the} pin 37 with respect to the bracket attachment 36. The central axis A _XS of the pin 37 is substantially perpendicular to the sliding direction Ds. The seat 58 is placed on the seat bracket 38. That is, the sheet 58 is placed above the slider 35 in the height direction _DH . The height direction _DH substantially coincides with the height direction of the sheet 58. Height direction D _H is the longitudinal direction D _L substantially perpendicular seat. Cushion mounting bracket 39 is mounted on the rear end of the seat front-rear direction D _L of the slider 35 (the other end in the sliding direction Ds of the slider 35). Since the seat bracket 38 rotates around the central axis _{AXS with} respect to the bracket attachment 36, the lower surface of the seat bracket 38 contacts the upper surface of the seat cushion rubber 40. The cushion mounting bracket 39 holds the seat cushion rubber 40 so that the upper surface of the seat cushion rubber 40 is maintained at an appropriate position even when the operator sits on the seat 58. Cushion mounting bracket 39 is mounted on the rear end of the seat front-rear direction D _L of the slider 35 (the other end in the sliding direction Ds of the slider 35).

FIG. 4 is a top view of the seat suspension 20 from which the seat bracket 38 and the seat base 31 are removed. Referring to FIG. 4, the pedestal 21 includes a left pedestal plate 22, a right pedestal plate 23, a front pedestal plate 24, a front pedestal mounting plate 25, and a rear pedestal plate 26. The left pedestal plate 22 and the right pedestal plate 23 are arranged side by side in the lateral direction D _W (width direction D _W ) of the seat suspension 20. The width direction _DW substantially coincides with the lateral direction of the sheet 58, and is perpendicular to the sliding direction Ds. The left base plate 22 and the right base plate 23, extending in the longitudinal direction D _L of the sheet 58 (sheet longitudinal direction D _L). The front base plate 24 connects the front end of the left base plate 22 and the front end of the right base plate 23, and extends in the width direction _DW . As shown in FIG. 5, the front pedestal plate 24 is a plate-like plate bent along the outer periphery of the front end of the left pedestal plate 22 and the outer periphery of the front end of the right pedestal plate 23, and viewed from the width direction _DW. It has a U-shaped shape. Before the base mounting plate 25 is connected prior to the lower end of the pedestal plate 24, extends from the lower end to the lower D _D, it is then bent forward. The front pedestal mounting plate 25 has a mounting portion 25a extending in the seat longitudinal direction D _L , and a support portion 25b connected to the mounting portion 25a and the front pedestal plate 24 and extending in the height direction D _H. The attachment part 25a and the support part 25b are formed by bending one plate. The mounting portion 25a is in contact with the cabin frame 51, and is mounted on the cabin frame 51 with bolts B1 and nuts N1. The support portion 25b supports the front pedestal plate 24. The rear pedestal plate 26 connects the rear end of the left pedestal plate 22 and the rear end of the right pedestal plate 23. The central portion of the rear pedestal plate 26 in the widthwise direction D _W as shown in FIG. 6, because it is displaced in the upward direction in the height direction D _H in comparison with the end portion of the rear pedestal plate 26 in the widthwise direction D _W, after The central portion of the pedestal plate 26 is attached to the cabin frame 51 in a state of being floated from the cabin frame 51. On the other hand, the end portion of the rear seat plate 26 is attached to the cabin frame 51 by a plurality of bolts B2 and a plurality of nuts N2.

As shown in FIG. 4, a pair of a first link 41 and a second link 43 are provided on one side of the seat 58 in the left-right direction _DW . The seat suspension 20 further includes a pair of a first additional link 42 and a second additional link 44 provided on a side opposite to the one side. The first link 41 and the first additional link have substantially the same configuration, and the second link 43 and the second additional link have substantially the same configuration. However, the first link 41 and the second link 42 may be provided at the center of the seat 58 in the left-right direction _DW , and the first additional link 42 and the second additional link 44 may be omitted.

In the embodiment shown in FIG. 4, the left pedestal plate 22 is provided so as to be sandwiched between the first link 41 and the second link 43. The right pedestal plate 23 is provided so as to be sandwiched between the first additional link 42 and the second additional link 44. However, the left pedestal plate 22 is provided so as to be interposed between the first additional link 42 and the second additional link 44, and the right pedestal plate 23 is interposed between the first link 41 and the second link 43. May be provided. In the present embodiment, the second link 43 and the second additional link 44 are provided so as to be located between the first link 41 and the first additional link 42 in the width direction _DW . However, the first link 41 and the first additional link 42 may be provided so as to be located between the second link 43 and the second additional link 44 in the width direction _DW .

As shown in FIGS. 4 and 5, the base 21 includes a first pivot axis Ax1, substantially parallel to the first pivot axis Ax1, first in the detaching direction D _SP from the first rotation axis Ax1 distance L ₁ and a second rotation axis Ax2 spaced. First pivot axis Ax1 and the second rotation axis Ax2 is substantially perpendicular to the seat front-rear direction D _L and the height direction D _H. The first rotation axis Ax1 and the second rotation axis Ax2 extend substantially parallel to the width direction _DW . Separating direction D _SP may not necessarily coincide with the seat front-rear direction D _L, may be inclined from the longitudinal sheet direction D _L.

Specifically, the left pedestal plate 22 and the right pedestal plate 23 respectively have through holes 222 and 232 through which pins 221 and 231 having the first rotation axis Ax1 as a central axis. The pin 221 is pressed into the first link 41. The first link 41 rotates around the first rotation axis Ax1 with respect to the pedestal 21 as the pin 221 rotates while sliding on the outer peripheral wall of the through hole 222. The pin 231 is pressed into the first additional link 42. The first additional link 42 rotates about the first rotation axis Ax1 with respect to the pedestal 21 by the pin 231 rotating while sliding on the outer peripheral wall of the through hole 232. The left pedestal plate 22 and the right pedestal plate 23 have through holes 224 and 234, respectively, through which pins 223 and 233 having the second rotation axis Ax2 as a central axis pass. The pin 223 is pressed into the second link 43. The second link 43 rotates around the second rotation axis Ax2 with respect to the pedestal 21 by the pin 223 rotating while sliding on the outer peripheral wall of the through hole 224. Note that the pin 223 is disposed so as to extend in the width direction _DW in the direction opposite to the direction in which the pin 221 extends with respect to the left pedestal plate 22. The pin 233 is pressed into the second additional link 44. The second additional link 44 rotates about the second rotation axis Ax2 with respect to the pedestal 21 by rotating while the pin 233 slides on the outer peripheral wall of the through hole 234. The pin 233 is disposed so as to extend in the width direction _DW in the direction opposite to the direction in which the pin 231 extends in the right pedestal plate 23.

The seat table 31 is supported by the base 21 via the first link 41 and the second link 43. More specifically, the seat base 31 is supported by the base 21 via the first link 41, the first additional link 42, the second link 43, and the second additional link 44. As shown in FIGS. 6 and 7, the seat base 31 includes a left Z-shaped member 32L and a right Z-shaped member 32R, and a connecting member (brace) 33 for connecting the left Z-shaped member 32L and the right Z-shaped member 32R. including. The left Z-shaped member 32L and the right Z-shaped member 32R may be collectively referred to as a Z-shaped member 32. The Z-shaped member 32 has an upper flange 32a, a web 32b, and a lower flange 32c. The upper flange 32a of the Z-shaped member 32 extends from the web 32b toward the center C of the pedestal 31 in the width direction _DW . Specifically, the upper flange 32a of the left Z-shaped member 32L extends rightward, and the upper flange 32a of the right Z-shaped member 32R extends leftward. The connecting member 33 connects the upper flange 32a of the left Z-shaped member 32L and the upper flange 32a of the right Z-shaped member 32R.

  A first link 41 and a second link 43 are connected to the web 32b of the Z-shaped member 32. In the present embodiment, the first link 41 and the second link 43 are connected to the web 32b of the left Z-shaped member 32L. The first additional link 42 and the second additional link 44 are connected to the web 32b of the right Z-shaped member 32R. However, the first link 41 and the second link 43 are connected to the web 32b of the right Z-shaped member 32R, and the first additional link 42 and the second additional link 44 are connected to the web 32b of the left Z-shaped member 32L. Is also good.

As described above, the rail 34, the slider 35, the bracket attachment 36, the pin 37, the seat bracket 38, the cushion mounting bracket 39, and the seat cushion rubber 40 are mounted on the lower flange 32c of the Z-shaped member 32. In FIG. 6, the rail 34, the slider 35, the bracket attachment 36, the pin 37, the seat bracket 38, the cushion mounting bracket 39, and the seat cushion rubber 40, which are mounted on the lower flange 32c of the left Z-shaped member 32L, are respectively connected to the rail 34L. , Slider 35L, bracket attachment 36L, pin 37L, seat bracket 38L, cushion mounting bracket 39L, and seat cushion rubber 40L. The rail 34, the slider 35, the bracket attachment 36, the pin 37, the seat bracket 38, the cushion mounting bracket 39, and the seat cushion rubber 40, which are mounted on the lower flange 32c of the right Z-shaped member 32R, are respectively mounted on the rail 34R, the slider 35R, The bracket attachment 36R, the pin 37R, the seat bracket 38R, the cushion mounting bracket 39R, and the seat cushion rubber 40R are shown. The rail 34R is separated from the rail 34L in the width direction _DW and extends parallel to the rail 34L. Slider 35L, slider 35R, respectively, the rail 34L in the height direction D _H, is placed on the rail 34R, a slidable rail 34L, the upper rail 34R in the sliding direction D _S.

Sheet base 31 is substantially parallel to the third rotation shaft Ax3 the first pivot axis Ax1, is substantially parallel to the third rotation shaft Ax3, separating direction D _SP from the third rotation shaft Ax3 a and a fourth rotation axis Ax4 spaced a first distance L _1. The third rotation axis Ax3 and the fourth rotation axis Ax4 extend substantially perpendicularly to the seat longitudinal direction D _L and the height direction D _H. Specifically, the web 32b of the left Z-shaped member 32L has a through hole 322 through which a pin 321 having the third rotation axis Ax3 as a central axis passes. The pin 321 is pressed into the first link 41. The first link 41 rotates around the third rotation axis Ax3 with respect to the pedestal 21 by rotating while the pin 321 is in sliding contact with the outer peripheral wall of the through hole 322. The web 32b of the right Z-shaped member 32R has a through hole 324 through which a pin 323 having the third rotation axis Ax3 as a central axis passes. The pin 323 is pressed into the first additional link 42. The first additional link 42 rotates about the third rotation axis Ax3 with respect to the pedestal 21 by the pin 323 rotating while sliding on the outer peripheral wall of the through hole 324. The web 32b of the left Z-shaped member 32L has a through hole 326 through which a pin 325 having the fourth rotation axis Ax4 as a central axis passes. The pin 325 is pressed into the second link 43. The second link 43 rotates around the fourth rotation axis Ax4 with respect to the pedestal 21 by rotating while the pin 325 slides on the outer peripheral wall of the through hole 326. The pin 325 is arranged so as to extend in the width direction _DW in the direction opposite to the direction in which the pin 321 extends in the web 32b of the left Z-shaped member 32L. The web 32b of the right Z-shaped member 32R has a through hole 328 through which a pin 325 having the fourth rotation axis Ax4 as a central axis passes. The pin 325 is pressed into the second additional link 44. The second additional link 44 rotates about the fourth rotation axis Ax4 with respect to the pedestal 21 by rotating while the pin 325 slides on the outer peripheral wall of the through hole 328. The pin 325 is arranged to extend in the width direction _DW in the direction opposite to the direction in which the pin 323 extends in the web 32b of the right Z-shaped member 32R. In the above-described embodiment, the pin 325 is configured as a rod that penetrates both the second link 43 and the second additional link 44. However, the pin that is press-fit into the second link 43 and the second additional link The pin pressed into the 44 may be a separate member.

As shown in FIGS. 3 and 5, the seat base 31, the seat as a backrest 59 of the seat 58 closer to the fourth rotation axis Ax4 than the third rotation shaft Ax3 in the longitudinal seat direction D _L is located 58 are installed. More specifically, the seat 58 as the backrest 59 of the seat 58 closer to the fourth rotation axis Ax4 than the third rotation shaft Ax3 in the longitudinal seat direction D _L is located is installed seat bracket 38L, the 38R You. As shown in FIG. 8, the seat brackets 38L and 38R are configured to support the left and right sides of the seat 58, respectively, and the seat brackets 38L and 38R are arranged around the central axis A _{XS with} respect to the bracket attachment 36. , The seat brackets 38L and 38R are configured to abut against the seat cushion rubbers 40L and 40R, respectively.

As shown in FIG. 3, since the pin 221 and the pin 321 having the above-described configuration are press-fitted into the first link 41, the distance between the first rotation axis Ax1 and the third rotation axis Ax3 is the second distance. the distance L ₂ between the first pivot axis Ax1 so that connects the third rotation shaft Ax3, is rotatable relative to the first pivot axis Ax1 and the third rotation shaft Ax3. The first link 41 is constituted by a linear arm.

The second link 43, since the pin 223 and the pin 325 having a configuration described above is pressed, so that the distance between the second rotation axis Ax2 and the fourth rotation axis Ax4 is a second distance L ₂ The second rotation axis Ax2 and the fourth rotation axis Ax4 are connected, and are rotatable with respect to the second rotation axis Ax2 and the fourth rotation axis Ax4. In the present embodiment, the second link 43 has a bell crank structure with the second rotation axis Ax2 as a fulcrum, and a main arm 431 extending from the second rotation axis Ax2 to the fourth rotation axis Ax4; It includes a main arm 431 and a sub arm 432 extending in a different direction from the second rotation axis Ax2. A link hook 45 is provided at the tip of the sub arm 432. That is, the seat suspension 20 includes the link hook 45 provided on the second link 43. The sub arm 432 extends from the second rotation axis Ax2 to the link hook 45. In the present embodiment, as viewed from the width direction D _W, the direction from the second rotation axis Ax2 Fourth rotation shaft Ax4, the angle between the direction from the second rotation axis Ax2 link hook 45, It is approximately 90 degrees. However, the second link 43 may have a T-shaped link structure instead of a bell crank structure, and the auxiliary arm 432 may have any shape as long as it extends from the main arm 431 to the link hook 45. . Also, as viewed from the width direction D _W, the direction from the second rotation axis Ax2 Fourth rotation shaft Ax4, the angle between the direction from the second rotation axis Ax2 link hook 45 is not necessarily 90 degrees It does not have to be near.

As shown in FIG. 5, since the pin 231 and the pin 323 having the above-described configuration are press-fitted into the first additional link 42, the distance between the first rotation axis Ax1 and the third rotation axis Ax3 is the third distance. as is second distance L ₂ connected to the first pivot axis Ax1 and the third rotation shaft Ax3, is rotatable relative to the first pivot axis Ax1 and the third rotation shaft Ax3. The first additional link 42 is configured by a linear arm.

Second additional link 44, the pin 233 and the pin 325 having a configuration described above is pressed, so that the distance between the second rotation axis Ax2 and the fourth rotation axis Ax4 is a second distance L ₂ Is connected to the second rotation axis Ax2 and the fourth rotation axis Ax4, and is rotatable with respect to the second rotation axis Ax2 and the fourth rotation axis Ax4. In the present embodiment, the second additional link 44 has a bell crank structure with the second rotation axis Ax2 as a fulcrum, and a main arm 441 extending from the second rotation axis Ax2 to the fourth rotation axis Ax4. , A main arm 441 and a sub arm 442 extending in a different direction from the second rotation axis Ax2. The link hook 45 is attached to the tip of the sub arm 442. That is, the sub arm 442 extends from the second rotation axis Ax2 to the link hook 45. In the present embodiment, as viewed from the width direction D _W, the direction from the second rotation axis Ax2 Fourth rotation shaft Ax4, the angle between the direction from the second rotation axis Ax2 link hook 45, It is approximately 90 degrees. However, the second additional link 44 may have a T-shaped link structure instead of the bell crank structure, and the auxiliary arm 442 may have any shape as long as it extends from the main arm 441 to the link hook 45. Good. Also, as viewed from the width direction D _W, the direction from the second rotation axis Ax2 Fourth rotation shaft Ax4, the angle between the direction from the second rotation axis Ax2 link hook 45 is not necessarily 90 degrees It does not have to be near.

As shown in FIGS. 4 and 5, the base 21 has a base hook 27 provided closer to the first pivot axis Ax1 than the second rotation axis Ax2 in the front-rear seat direction D _L. The seat suspension 20 includes an elastic member 46 that is hooked on the pedestal hook 27 and the link hook 45 and draws the link hook 45 toward the pedestal hook 27. In the present embodiment, the pedestal hook 27 and the link hook 45 are composed of a rod. Further, the pedestal hook 27 has a groove at a portion where the elastic member 46 is hooked. The link hook 45 may have a similar groove. In the present embodiment, the elastic member 46 is a tension spring. However, the elastic member 46 may be made of rubber. As shown in FIG. 4, the elastic member 46 is disposed between the first link 41 and the first additional link 42 in the width direction _DW . The elastic member 46 is disposed between the second link 43 and the second additional link 44 in the width direction _DW . Therefore, the first additional link 42 is disposed on the opposite side of the first link 41 with respect to the elastic member 46 in the width direction _DW . The second additional link 44 is disposed on the opposite side of the second link 43 with respect to the elastic member 46 in the width direction _DW . The seat suspension 20 may include a plurality of elastic members 46 and 47 between the first link 41 and the first additional link 42 in the width direction _DW . That is, the seat suspension 20 is provided between the first link 41 and the first additional link 42 and between the second link 43 and the second additional link 44 in the width direction _DW . 45, and may further include at least one additional elastic member 47 that hooks the link hook 45 toward the pedestal hook 27. In the present embodiment, an example in which the seat suspension 20 includes the four elastic members 46 and 47 is disclosed, but the number of the elastic members 46 and 47 may be one or more.

Pedestal 21 is connected to the base hook 27, further comprising an adjuster 28 configured to adjust the position of the base hook 27 in the seat front-rear direction D _L. As shown in FIG. 5, the adjuster 28 includes an operation knob 28a rotatably attached to the front pedestal plate 24, and a male screw 28b mounted on the pedestal hook 27 and screwed into a female screw inside the operation knob 28b. With the rotation of the operation knob 28a, the male screw 28b and the pedestal hook 27 move in the seat longitudinal direction D _L , whereby the tension of the elastic members 46 and 47 is adjusted. As shown in FIGS. 3 and 5, the left pedestal plate 22 and the right pedestal plate 23 have through holes 22a and 23a, respectively, for restricting the pedestal hook 27 from moving in the height direction _DH. I have. The rod constituting the pedestal hook 27 passes through both the through holes 22a and 23a.

As shown in FIGS. 4 and 5, the first link 41 and the first additional link 42 are link extending portions 41a and 42a extending in a direction opposite to a direction from the third rotation axis Ax3 toward the first rotation axis Ax1. Having. Therefore, the first link 41 and the first additional link 42 have a trapezoidal shape when viewed from the width direction _DW . The link extending portions 41a and 42a can respectively contact the lower surface of the upper flange 32a of the left Z-shaped member 32L and the lower surface of the upper flange 32a of the right Z-shaped member 32R. Specifically, as shown in FIG. 5, when the elastic members 46 and 47 draw the link hook 45 toward the pedestal hook 27 in a state where the operator is not seated on the seat 58, the link extending portions 41a and 42a Contacts the lower surface of the upper flange 32a. This restricts the sheet 58 from moving upward and forward from the position of the sheet 58 where the link extending portions 41a and 42a are in contact with the lower surface of the upper flange 32a.

  As shown in FIGS. 4 to 6, the seat suspension 20 further includes a stopper 48 that regulates the downward and rearward movement of the seat 58. In the present embodiment, the stopper 48 is formed of a plate extending from the second link 43 to the second additional link 44. However, the shape of the stopper 48 is not limited to this, and may be attached to only one of the second link 43 and the second additional link 44, and may be attached to at least one of the first link 41 and the first additional link. May be obtained. The pedestal 21 further includes a stopper cushion rubber 29 attached to the rear pedestal plate 26. The stopper cushion rubber 29 comes into contact with the stopper 48 when the seat 58 moves backward and downward to the maximum allowable range.

FIG. 9 is a schematic explanatory view showing the movable range of the seat suspension 20, particularly the second link 43 and the second additional link 44. In FIG. 9, the link extension portion 42a shown in FIG. 5 is in contact with the lower surface of the upper flange 32a of the right Z-shaped member 32R (the link hook 45 is stationary while the seat 58 is empty). , The second additional link 44, the link hook 45, the stopper 48, and the pin 325 are indicated by solid lines. The second additional link 44, the link hook 45, the stopper 48, and the pin 325 in a state where the stopper 48 is in contact with the stopper cushion rubber 29 are indicated by a two-dot chain line. According to FIG. 9, obviously, the link hook 45, upwards than the second rotation axis Ax2 in the height direction D _H, and, the front than the second rotation axis Ax2 in the front-rear seat direction D _L It is movable within the range. Therefore, the link hook 45 is arranged such that the longer the elastic members 46 and 47 extend, the greater the first angle θ1 between the contraction direction F1 of the elastic members 46 and 47 and the rotation direction of the link hook 45 becomes. I understand. Specifically, the first angle θ1 when the link hook 45 is at the first position P1 where the link hook 45 stands still in a state where the seat 58 is vacant is θ11, and the link extension portion 42a is the right Z-shaped member. The first angle θ1 when the link hook 45 is located at the second position P2 where the link hook 45 is located in contact with the lower surface of the upper flange 32a of 32R is defined as θ12. At this time, θ12 is larger than θ11. And θ12 is closer to 180 degrees than θ11. Further, the first angle θ1 gradually increases from θ11 to θ12 as the link hook 45 moves from the first position P1 to the second position P2.

  FIG. 10 is a diagram illustrating the relationship between the amount of depression of the seat 58 and the seat load. In FIG. 10, the maximum sheet sinking amount 0 corresponds to the amount of sinking of the sheet 58 when the link hook 45 is at the first position P2, and the maximum sheet sinking amount Smax is that the link hook 45 is at the second position P2. Corresponds to the amount of depression of the sheet 58 when As described above, the more the seat 58 sinks, the larger the amount of extension of the spring required for the increase in the amount of sinking of the sheet becomes. Therefore, as shown in FIG. The sheet 58 easily sinks. That is, the repulsive force from the seat 58 is small. Conversely, when the load on the seat 58 is large, the seat 58 is unlikely to sink. That is, the repulsive force from the seat 58 is large. Therefore, the seat suspension 20 can provide the operator with a comfortable ride.

On the other hand, as shown in FIG. 9, the fourth rotation shaft Ax4 is upward than the second rotation axis Ax4 in the height direction D _H, and, from the second rotation axis Ax2 in the front-rear seat direction D _L Can also be moved within the rearward range. Therefore, if the elastic members 46 and 47 are attached to the link 325 as shown in Japanese Patent Application Laid-Open No. 9-167817, as the elastic members 46 and 47 extend, the direction F2 in which the elastic members contract and the link hook The second angle θ2 formed by the rotation direction of the forty-five is reduced. Specifically, the second angle θ2 when the link hook 45 is at the first position P1 is θ21, and the second angle θ2 when the link hook 45 is at the second position P2 is θ22. At this time, θ22 is smaller than θ21. And θ22 is closer to 90 degrees than θ21. Further, the second angle θ2 gradually decreases from θ21 to θ22 as the link hook 45 moves from the first position P1 to the second position P2.

  FIG. 11 is a diagram showing the relationship between the amount of depression of the seat 58 and the seat load in this case. Also in FIG. 11, the maximum sheet sinking amount 0 corresponds to the amount of sinking of the sheet 58 when the link hook 45 is at the first position P1, and the maximum sheet sinking amount Smax is that the link hook 45 is at the second position P2. Corresponds to the amount of depression of the sheet 58 when Contrary to the above embodiment, as the seat 58 sinks, the amount of spring expansion required for the increase in the sink amount of the sheet 58 decreases, and as shown in FIG. The larger the load, the more easily the seat 58 sinks. For this reason, in the technology of Japanese Patent Application Laid-Open No. 9-167817, it is necessary to provide another cushion so that the seat 58 is unlikely to sink when the load on the seat 58 is large. Since such a cushion is not required in the seat suspension 20, the seat suspension 20 can provide a comfortable ride to the operator with a simple structure.

In FIG. 9, the first angle θ11 when the link hook 45 is at the first position P1 is larger than the second angle θ21 at that time. Therefore, even when the load on the seat 58 is small, the suspension function is effectively utilized by effectively utilizing the tension of the elastic members 46 and 47 as compared with the suspension (conventional suspension) disclosed in JP-A-9-167817. Can be realized.
[Second embodiment]
In the seat suspension according to the present application, the elastic members 46 and 47 are not limited to those disclosed in the first embodiment, but may be compression springs. Hereinafter, the configuration of the seat suspension 120 according to the present embodiment will be described. However, the same components as those of the seat suspension 20 according to the first embodiment will be denoted by the same reference numerals and description thereof will be omitted. The configuration of the seat suspension 120 not described in the present embodiment is the same as the configuration of the seat suspension 20.

FIG. 12 schematically shows the seat suspension 120 as a cross-sectional view as shown in FIG. The seat suspension 120 includes a pedestal 121, a seat table 31, a first link 41 (first additional link 42), a second link 143 (second additional link 144), a link hook 145, and a resilient compression spring. And a member 146. The elastic member 146 is preferably a compression coil spring. The pedestal 121 has a structure similar to the pedestal 21 of the first embodiment, except for the pedestal hook 127. Pedestal hooks 127, in the seat front-rear direction D _L than the second rotation axis Ax2 in terms provided closer to the first pivot axis Ax1 is the same as the first embodiment. However, the pedestal hook 127 is different from the pedestal hook 27 of the first embodiment in that it has a guide 127a fixed to the adjuster 28. When the guide 127 a is inserted into the opening of the elastic member 146, the elastic member 146 is hooked on the base hook 127.

The second link 143 includes a main arm 431 extending from the second rotation axis Ax2 to the fourth rotation axis Ax4, and a sub arm 1432 extending from the main arm 431 to the link hook 145. The sub arm 1432 extends from the second rotation axis Ax2 to the link hook 145, but in a different direction from the sub arm 442 (432) of the first embodiment. Secondary arm 1432 moves the link hooks 145, lower in than the second rotation axis Ax2 in the height direction D _H, and, to the extent that the rearward of the second turning axis Ax2 in the front-rear seat direction D _L Extend in the direction that allows. When the seat suspension 120 includes the second additional link 144, the second additional link 144 has the same structure as the second link 143. The link hook 145 differs from the link hook 45 of the first embodiment in that it has a guide 145a fixed to the sub arm 442. When the guide 145a is inserted into the opening of the elastic member 146, the elastic member 146 is hooked on the link hook 145.

Here, the position of the link hook 145 where the link hook 145 stops at a state where the sheet 58 is vacant is defined as a first position P1, and the position of the link hook 145 when the sheet 58 is fully lowered is defined as a second position P2. . When the position of the link hook 145 is between the first position P1 and the second position P2, the guide 127a and the guide 145a are installed such that the guide 127a and the guide 145a are arranged substantially facing each other. It is desirable. As a result of the link hook 145 being attached in this manner, the elastic member 146 pushes the link hook 145 so as to move the link hook 145 away from the pedestal hook 127. Further, the guide 127a and the guide 145a may be arranged such that as the elastic member 146 shrinks, the first angle θ1 formed by the direction F1 pressed by the elastic member 146 and the rotation direction R1 of the link hook 145 increases. desirable. On the other hand, the fourth rotation shaft Ax4 is upward than the second rotation axis Ax2 in the height direction D _H, and, to the extent that the rearward of the second turning axis Ax2 in the front-rear seat direction D _L Can be moved. Therefore, the seat suspension 120 has the same effect as the suspension 20 of the first embodiment.
[Third embodiment]
In the seat suspension according to the present application, the elastic members 46 and 47 are not limited to those disclosed in the first embodiment and the second embodiment, and the seat hook 27 and the pin 325 having the fourth rotation axis Ax4 as the center axis. It may be hooked. Hereinafter, the configuration of the seat suspension 220 according to the present embodiment will be described. However, the same components as those of the seat suspension 20 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The configuration of the seat suspension 220 not described in this embodiment is the same as the configuration of the seat suspension 20.

FIG. 13 schematically shows the seat suspension 220 as a cross-sectional view as shown in FIG. The seat suspension 220 includes a pedestal 21, a seat table 31, a first link 41 (a first additional link 42), a second link 243 (a second additional link 244), and an elastic member 46 (an additional elastic member 47). Is provided. The second link 243 (second additional link 244) has only the main arm 431 (441). As shown in FIG. 13, the elastic member 46 (47) is hooked on the pedestal hook 27 and the pin 325 having the fourth rotation axis Ax4 as the center axis, and the fourth rotation axis Ax4 is rotated by the first rotation. The fourth rotation axis Ax4 is drawn toward the pedestal hook 27 so as to rotate in the direction Rm1. Sheet base 31 has a seat base first end 331 is closer to the end portion by the fourth rotation shaft Ax4 than the third rotation shaft Ax3 in the seat front-rear direction D _L.

  The seat suspension 220 is further provided on the seat base first end 331 and extends in a second rotation direction Rm2 opposite to the first rotation direction Rm1; A compression spring 49 is provided in the downward direction Dd from the table 31 toward the pedestal 21, and a spring base 50 is provided in the downward direction Dd with respect to the compression spring 49 and can receive the compression spring 49. The spring stand 50 is installed on the cabin frame 51.

In the seat suspension 220 according to the present embodiment, when the load on the seat 58 is increased and the seat 58 sinks, the compression spring 49 abuts on the spring base 50 to generate an upward reaction force, so that the seat 58 When the load becomes large and the sheet 58 sinks, the further depression of the sheet 58 is suppressed.
[Fourth embodiment]
The seat suspension according to the present application may be such that the seat suspensions 20, 120, and 220 according to the first to third embodiments are further provided with a seating sensor. Hereinafter, the configuration of the seat suspension 320 according to the present embodiment will be described. However, the same components as those of the seat suspensions 20, 120, and 220 according to the first to third embodiments are denoted by the same reference numerals, and description thereof will be omitted. The configuration of the seat suspension 320 not described in the present embodiment is the same as the configuration of the seat suspension 20.

  Referring to FIG. 14, the seat suspension 320 includes a seat cushion rubber 440, a seat switch 441, and a seat support compression spring 442 instead of the cushion mounting bracket 39 and the seat cushion rubber 40 of the seat suspension 20 of the first embodiment. The slider 35 includes an extension 439. The seat switch 441 is mounted on the slider 35, and the seat cushion rubber 440 is mounted on the seat switch 441. The sheet support compression spring 442 is mounted on the extension 439.

  In this embodiment, the rail 34, the slider 35 (including the extension 439), the bracket attachment 36, the pin 37, and the seat bracket are provided on the seat table 31 (more specifically, the Z bar 32). 38, the seat cushion rubber 440, the seat switch 441, and the seat support compression spring 442 are collectively referred to as the seat detection device 100.

Referring to FIG. 15, the extension 439 included in the slider 35L is defined as an extension 439L, and the extension 439 included in the slider 35R is defined as an extension 439R. The seat cushion rubber 440, the seat switch 441, and the seat support compression spring 442 mounted on the slider 35L are referred to as a seat cushion rubber 440L, a seat switch 441L, and a seat support compression spring 442L, respectively. The seat cushion rubber 440, the seat switch 441, and the seat support compression spring 442 mounted on the slider 35R are referred to as a seat cushion rubber 440R, a seat switch 441R, and a seat support compression spring 442R, respectively. That is, the seat detection device 100 includes the rails 34L and 34R, the sliders 35L and 35R (including the extension portions 439L and 439R), the seat cushion rubbers 440L and 440R, the seat switches 441L and 441R, and the seat support compression springs 442L and 442R. Is provided. However, the seating detection device 100 may include only one rail 34, one slider 35, one seat cushion rubber 440, one seating switch 441, and one seat support compression spring 442. . In that case, one rail 34, one slider 35, one seat cushion rubber 440, one seat switch 441, and one seat support compression spring 442 are arranged at the center of the seat 58 in the width direction _DW. Preferably.

Referring to FIG. 15, the seating switch 441L is placed on the slider 35L in the height direction D _H, the switch button 443L for switching on and off by moving substantially along the height direction D _H Have. Seating switch 441R includes a switch button 443R for switching the height is placed in the direction D _H on the slider 35R, on and off by moving substantially along the height direction D _H. The switch buttons 443L and 443R may be attached to the sliders 35L and 35R, respectively, with an adhesive or an attachment member (not shown) (not shown). Since all the load of the seat 58 is received by the sliders 35L and 35R, it is preferable to arrange the seating switches 441L and 441R on the sliders 35L and 35R from the viewpoint of the accuracy of the seating detection.

The seat cushion rubber 440L has a concave portion 444L, and is placed on the seating switch 441L and the slider 35L in the height direction _DH so that the switch button 443L is inserted into the concave portion 444L. The seat 58 is placed above the seat cushion rubber 440L in the height direction _DH . The seat cushion rubber 440R has a concave portion 444R, and is placed on the seating switch 441R and the slider 35R in the height direction _DH so that the switch button 443R is inserted into the concave portion 444R. The seat 58 is placed above the seat cushion rubber 440R in the height direction _DH . The seat cushion rubbers 440L and 440R may be attached to the seat brackets 38L and 38R, respectively, with an adhesive or an attachment member (not shown) (not shown). Alternatively, the seat cushion rubbers 440L and 440R may be attached to the sliders 35L and 35R, respectively, with attachment members (not shown) such as cushion attachment fittings 39L and 39R. Seat cushion rubber 440L, 440R, for example, the operator on the right, the seat cushion rubber 440L be seated offset to the left, 440R are elastically deformed can press switch button 443L, a 443R in the height direction D _H . Therefore, the accuracy of the seat detection of the seat detection device 100 can be improved.

The extension 439L extends in the width direction _DW . More specifically, the extension 439L extends in the width direction _DW and in the direction (leftward) away from the rail 34R. The extension 439R extends in the width direction _DW . More specifically, the extension 439R extends in the width direction _DW and in the direction (rightward) away from the rail 34L.

The seat support compression spring 442L is placed on the extension 439L and abuts on the extension 439L and the seat bracket 38L. Sheet supporting compression springs 442L pushes up the sheet 58 in the height direction D _H with respect to the extending portion 439L. Sheet supporting compression spring 442L is in close proximity to the seating switch 441L, and, a slider 35R relative to the seating switch 441L in the width direction D _W are disposed on the opposite side of the side (right side) to position (left side). The seat support compression spring 442R is mounted on the extension 439R and abuts on the extension 439R and the seat bracket 38R. Sheet supporting compression springs 442R pushes up the sheet 58 in the height direction D _H with respect to the extending portion 439R. Sheet supporting compression springs 442R is adjacent to the seating switch 441R, and, a slider 35L with respect to the seating switch 441R in the width direction D _W are disposed on the opposite side of the side (left side) to position (right side). In addition, the seat support compression spring 442L surely turns off the seating switch 441L when the operator is not seated on the seat 58, and reliably turns on the seating switch 441L when a predetermined load or more is applied to the seat 58. It has a spring constant and free length. The seat support compression spring 442R has a spring constant that ensures that the seat switch 441R is turned off when the operator is not seated on the seat 58, and that the seat switch 441R is reliably turned on when a predetermined load or more is applied to the seat 58. And have a free length. The seat support compression spring 442L is fixed to the extension 439L and the seat bracket 38L by a known method such as a counterbore hole or a washer. Similarly, the seat support compression spring 442R is fixed to the extension 439R and the seat bracket 38R by a known method such as a counterbore hole or a washer.

Referring to FIG. 16, the bracket attachment 36L is provided in the front end portion 335LF is an end of the slider 35L in the sliding direction D _S, supporting a seat bracket 38L. Seating switch 441L, the front end portion 335LF in the sliding direction D _S is placed on an end portion opposite of the slider 35L rear end 335LR. That is, as shown in FIG. 14, the seating switch 441L is so that closer to the fourth rotation axis Ax4 than the third rotation shaft Ax3 in the sliding direction D _S, placed seating switch 441L is the seat base 31 Is done. Further, as described in the first embodiment, the bracket attachment 36L supports the seat bracket 38L through a pin 37L which extends in a substantially vertical orientation in the sliding direction D _S. The bracket attachment 36L has an extension plate 36L extending forward from a front end 335LF of the slider 35L, and supports the pin 37L at the front end of the extension plate 336L. Therefore, as shown in FIG. 14, the pin 37L is located below D _d of the front end of the sheet 58 in the height direction D _H.

Similarly, referring to FIG. 16, the bracket attachment 36R is provided at the front portion 335RF is an end of the slider 35R in the sliding direction D _S, supporting a seat bracket 38R. Seating switch 441R, the front end portion 335RF in the sliding direction D _S is placed on an end portion opposite of the slider 35R rear end 335RR. That is, like the seat switch 441L, seating switch 441R is to be closer to the fourth rotation axis Ax4 than the third rotation shaft Ax3 in the sliding direction D _S, the seating switch 441R is placed on the sheet table 31 You. Further, as described in the first embodiment, the bracket attachment 36L supports the seat bracket 38R via a pin 37R extending in a substantially vertical orientation in the sliding direction D _S. The bracket attachment 36R has an extension plate 336R extending forward from the front end 335RF of the slider 35R, and supports the pin 37R at the front end of the extension plate 336R. Therefore, the pin 37R, like the pin 37L, located below D _d of the front end of the sheet 58 in the height direction D _H.

The pin 37L and the pin 37R have a common center axis A _XS . The bracket attachment 36L is rotatable about a central axis A _XS pin 37L so supporting the seat bracket 38L. Bracket attachment 36R is rotatable about the central axis A _XS pin 37R so supporting the seat bracket 38R. As described above, the seat cushion rubber 440L and the seating switch 441L are disposed at positions away from the fulcrum (the central axis A _{XS of the} pin 37L), and therefore receive a large force due to the load applied to the seat 58 by the leverage principle. It will be. Similarly, since the seat cushion rubber 440R and the seat switch 441R are arranged at positions distant from the fulcrum (the central axis A _{XS of the} pin 37R), the principle of leverage greatly increases the force due to the load applied to the seat 58. Become. Therefore, the seat switch 441L and the seat switch 441R can accurately detect seating on the seat 58.

Further, since the seat support compression spring 442L is disposed close to the seat switch 441L, the seat switch 441L can be quickly turned off when the seat 58 is no longer seated. Further, FIG. 14, as shown in FIG. 15, since the seat support compression spring 442L is, the slider 35R relative to the seating switch 441L in the width direction D _W are disposed on the opposite side of the side (right side) to position (left side) Also, even when the operator is seated on the left side of the seat 58, it is possible to prevent the seat 58 from greatly tilting in the width direction _DW .

Similarly, since the seat support compression spring 442R is disposed close to the seat switch 441R, the seat switch 441R can be quickly turned off when the seat 58 is no longer seated. Further, FIG. 14, as shown in FIG. 15, since the seat support compression spring 442R is a slider 35L with respect to the seating switch 441R in the width direction D _W are disposed on the opposite side of the side (left side) to position (right side) In addition, even when the operator is seated on the right side of the seat 58, it is possible to prevent the seat 58 from greatly tilting in the width direction _DW .

Furthermore, as shown in FIGS. 14 and 16, the backrest 59 of the seat 58 is close to the rear end portion 335LR from the front end portion 335LF of the slider 35L in the sliding direction D _S, and, after the front end 335RF of the slider 35R The seat 58 is mounted on the seat bracket 38 so as to be close to the end 335RR. Thereby, when the operator leans on the backrest 58, the load is easily applied to the seating switches 441L and 441R. Therefore, the seat switch 441L and the seat switch 441R can accurately detect seating on the seat 58.

In the present embodiment, one of the rails 34L and 34R may be referred to as a first rail, and the other may be referred to as a second rail. Of the sliders 35L and 35R, the slider mounted on the first rail may be referred to as a first slider, and the slider mounted on the second rail may be referred to as a second slider. Of the front ends 335LF and 335RF, the front end of the first slider may be referred to as a first end, and the front end of the second slider may be referred to as a third end. Of the rear ends 335LR and 335RR, the rear end of the first slider may be referred to as a second end, and the rear end of the second slider may be referred to as a fourth end. Of the extending portions 439L and 439R, the extending portion included in the first slider may be referred to as a first extending portion, and the extending portion included in the second slider may be referred to as a second extending portion. Of the seat switches 441L and 441R, the seat switch mounted on the first slider may be referred to as a first seat switch, and the seat switch mounted on the second slider may be referred to as a second seat switch. . Of the switch buttons 443L and 443R, the switch button of the first seating switch described above may be referred to as a first switch button, and the switch button of the second seating switch described above may be referred to as a second switch button. Of the seat cushion rubbers 440L and 440R, the one mounted on the first seat switch is referred to as a first elastic member, and the one mounted on the second seat switch is referred to as a second elastic member. Good. Of the concave portions 444L and 444R, the concave portion of the first elastic member may be referred to as a first concave portion, and the concave portion of the second elastic member may be referred to as a second concave portion. Of the sheet support compression springs 442L and 442R, the one placed on the first extension is referred to as a third elastic member, and the one placed on the second extension is referred to as a fourth elastic member. May be. Of the bracket attachments 36L and 36R, one mounted on the first slider may be referred to as a first bracket attachment, and one mounted on the second slider may be referred to as a second bracket attachment. Of the pins 37L and 37R, the one attached to the first bracket attachment may be referred to as a first pin, and the one attached to the second bracket attachment may be referred to as a second pin.
(Modification)
In the above embodiment, the structure for fixing the pedestal 21 to the cabin frame 51, the structure for restricting the movement of the seat 58 by the link extending portions 41a and 42a, and the stopper 48, and the structure and shape of the seat bracket 38 are as described above. However, an alternative structure that performs the same function may be adopted. For example, the seat bracket 38 does not need to be constituted by the two seat brackets 38L and 38R, and may be constituted by one bracket or three or more brackets. In the first to third embodiments, at least one of the rail 34, the slider 35, the bracket attachment 36, the pin 37, the cushion mounting bracket 39, and the seat cushion rubber 40 may be omitted. The bracket 38 may be directly mounted.

  In the present application, “comprising” and its derivatives are non-limiting terms that describe the existence of components and do not exclude the presence of other components not listed. This also applies to "having," "including," and derivatives thereof.

  The terms “member”, “part”, “element”, “body”, and “structure” can have multiple meanings, such as a single part or multiple parts.

  Ordinal numbers such as "first" and "second" are simply terms for identifying configurations, and have no other meaning (for example, a specific order). For example, the presence of the “first element” does not imply that the “second element” exists, and the presence of the “second element” does not imply that the “first element” exists. It does not imply that the "element" exists.

  Words such as "substantially", "about", and "approximately" that refer to a degree may mean a reasonable amount of shift that does not significantly change the final result. All numerical values set forth in this application may be interpreted to include words such as "substantially", "about", and "approximately".

  Obviously, various changes and modifications of the present invention are possible in light of the above disclosure. Therefore, the present invention may be implemented by a method different from the specific disclosure content of the present application without departing from the spirit of the present invention.

20: Seat suspension 21: Pedestal 27: Pedestal hook 28: Adjuster 31: Seat base 34L, 34R: First rail, second rail 35L, 35R: First slider, Second slider 335LF, 335RF: First end, First end Three ends 335LR, 335RR: second end, fourth ends 36L, 36R: first bracket attachment, second bracket attachment 37L, 37R: first pin, second pin 38 (38L, 38R): seat bracket 41 : First link 42: First additional link 43: Second link 431: Main arm 432, 1432: Secondary arm 44: Second additional link 45: Link hook 46: Elastic member 146: Compression spring 58: Seat 59: Backrest 100 : Seating detection devices 439L, 439R: first extension portion, second extension portion 4 40L, 440R: 1st elastic member, 2nd elastic member 441L, 441R: 1st seat switch, 2nd seat switch 442L, 442R: 3rd elastic member, 4th elastic member 443L, 443R: 1st switch button, 2nd Switch buttons 444L, 444R: first concave portion, second concave portion
Ax1: First rotation axis
Ax2: Second rotation axis
Ax3: Third rotation axis
Ax4: 4th rotation axis
A _XS : Central axis θ1: First angle

Claims (23)

A first rail extending in the sliding direction;
A first slider mounted on the first rail in a height direction and slidable on the first rail in the sliding direction;
A first seating switch mounted on the first slider in the height direction and having a first switch button for switching on and off by moving substantially along the height direction;
It has a 1st recessed part, is mounted on the 1st seating switch and the 1st slider in the height direction so that the 1st switch button is inserted in the 1st recessed part, and it is in the height direction. A first elastic member on which the sheet is placed,
A seating detection device for a seat, comprising:
A second rail that is separated from the first rail in a width direction perpendicular to the sliding direction and extends in parallel with the first rail;
A second slider placed on the second rail in the height direction and slidable on the second rail in the sliding direction;
A second seating switch mounted on the second slider in the height direction and having a second switch button for switching on and off by moving substantially along the height direction;
It has a 2nd recessed part, and is mounted on the 2nd seating switch and the 2nd slider in the height direction so that the 1st switch button is inserted in the 2nd recessed part, and in the height direction A second elastic member on which the sheet is placed,
The seat occupancy detection device according to claim 1, further comprising:
The first slider includes a first extension that extends in a width direction perpendicular to the sliding direction,
The seating detection device further includes a third elastic member mounted on the first extension and pushing up the seat in the height direction with respect to the first extension.
The seat occupancy detection device according to claim 1.
The first slider includes a first extension that extends in the width direction,
The second slider includes a second extending portion extending in the width direction,
The seat detection device,
A third elastic member that is placed on the first extension and pushes up the sheet in the height direction with respect to the first extension;
A fourth elastic member that is placed on the second extension and pushes up the sheet in the height direction with respect to the second extension;
Further comprising,
The seat occupant detection device according to claim 2.
The third elastic member is disposed in proximity to the first seating switch;
The seat occupant detection device according to claim 3.
The third elastic member is arranged near the first seating switch and on the side opposite to the side where the second slider is located with respect to the first seating switch in the width direction,
The fourth elastic member is disposed near the second seating switch and on the side opposite to the side where the first slider is located with respect to the second seating switch in the width direction.
The seat occupancy detection device according to claim 4.
The seat occupancy detection device according to claim 1, wherein the first elastic member is rubber.
The seat occupancy detection device according to claim 2, wherein the second elastic member is rubber.
The seat occupancy detection device according to claim 3, wherein the third elastic member is a compression spring.
The seat occupant detection device according to claim 4, wherein the fourth elastic member is a compression spring.
A sheet bracket on which the sheet is placed,
A first bracket attachment provided at a first end, which is an end of the first slider in the sliding direction, for supporting the seat bracket;
Further comprising
The first seating switch is mounted on a second end which is an end of the first slider opposite to the first end in the sliding direction.
The seat occupancy detection device according to claim 1.
A seat bracket on which the seat is installed,
A first bracket attachment provided at a first end, which is an end of the first slider in the sliding direction, for supporting the seat bracket;
A second bracket attachment provided at a third end that is an end of the second slider in the sliding direction and supporting the seat bracket;
Further comprising
The first seating switch is mounted on a second end which is an end of the first slider opposite to the first end in the sliding direction,
The second seating switch is mounted on a fourth end, which is an end of a second slider opposite to the third end in the sliding direction.
The seat occupancy detecting device according to claim 2, 4, 6, 8, or 10.
The first bracket attachment supports the seat bracket rotatably about a bracket rotation axis substantially perpendicular to the sliding direction;
A seat occupancy detection device according to claim 11.
The first bracket attachment supports the seat bracket via a first pin extending in a direction substantially perpendicular to the sliding direction;
The second bracket attachment supports the seat bracket via a second pin extending in a direction substantially perpendicular to the sliding direction,
The central axis of the first pin matches the central axis of the second pin,
The first bracket attachment supports the seat bracket rotatably around a central axis of the first pin,
The second bracket attachment supports the seat bracket so as to be rotatable around a center axis of the second pin.
The seat occupant detection device according to claim 12.
The seat is mounted on the seat bracket such that a backrest of the seat is closer to the second end than the first end in the sliding direction;
The seat occupancy detection device according to claim 11.
The seat is such that the seat back is closer to the second end than the first end in the sliding direction and closer to the fourth end than the third end. Installed on the bracket,
The seat occupancy detection device according to claim 12 or 14.
A seating detection device according to any one of claims 1 to 16,
A first pivot axis extending in a width direction substantially perpendicular to the sliding direction; and a first distance substantially parallel to the first pivot axis and spaced apart from the first pivot axis. A pedestal including a second pivot shaft that is separated, and a pedestal having a pedestal hook provided closer to the first pivot shaft than the second pivot shaft in the sliding direction;
A third rotation axis substantially parallel to the first rotation axis; and a third rotation axis substantially parallel to the third rotation axis and separated from the third rotation axis by the first distance in the separation direction. And the first seating switch is mounted such that the first seating switch is closer to the fourth rotating shaft than the third rotating shaft in the sliding direction. A seat table,
Connecting the first rotation axis and the third rotation axis such that a distance between the first rotation axis and the third rotation axis is a second distance; And a first link rotatable with respect to the third rotation axis;
Connecting the second rotation axis and the fourth rotation axis such that a distance between the second rotation axis and the fourth rotation axis is the second distance; A second link rotatable with respect to an axis and the fourth rotation axis;
An elastic member that is hooked on the pedestal hook and the second link and pulls the fourth rotation axis toward the pedestal hook;
A seat suspension.
A link hook provided on the second link,
The elastic member is hooked on the pedestal hook and the link hook, and pulls the link hook toward the pedestal hook,
18. The seat suspension according to claim 17, wherein the link hook is arranged such that a first angle formed by a direction in which the elastic member contracts and a rotation direction of the link hook increases as the elastic member extends.
A first rotation axis and a second rotation axis substantially parallel to the first rotation axis and separated from the first rotation axis by a first distance in a direction away from the first rotation axis; A pedestal having a pedestal hook provided closer to the first rotation axis than to the second rotation axis in a seat longitudinal direction substantially perpendicular to both the moving axis and the second rotation axis;
A third rotation axis substantially parallel to the first rotation axis; and a third rotation axis substantially parallel to the third rotation axis and separated from the third rotation axis by the first distance in the separation direction. A seat base on which the seat is installed such that the backrest of the seat is located closer to the fourth rotation axis than to the third rotation axis in the seat front-rear direction.
Connecting the first rotation axis and the third rotation axis such that a distance between the first rotation axis and the third rotation axis is a second distance; And a first link rotatable with respect to the third rotation axis;
Connecting the second rotation axis and the fourth rotation axis such that a distance between the second rotation axis and the fourth rotation axis is the second distance; A second link rotatable with respect to an axis and the fourth rotation axis;
A link hook provided on the second link;
A compression spring that is hung on the pedestal hook and the link hook and pushes out the link hook so as to move the link hook away from the pedestal hook;
The seat suspension according to claim 1, wherein the link hook is disposed such that a first angle formed between a direction in which the compression spring presses and a rotation direction of the link hook increases as the compression spring contracts.
The link hook is lower than the second rotation axis in a height direction substantially perpendicular to the seat front-rear direction and the second rotation axis, and the second hook in the seat front-rear direction. 20. The seat suspension according to claim 19, wherein the seat suspension is movable within a range behind the driving axis.
The fourth rotation axis is movable within a range that is higher than the second rotation axis in the height direction and is rearward of the second rotation axis in the seat front-rear direction. The seat suspension according to claim 20.
The second link is
A main arm extending from the second rotation axis to the fourth rotation axis;
A sub arm extending from the main arm to the link hook;
22. The seat suspension of claim 21, comprising:
  23. The seat suspension according to claim 22, wherein the auxiliary arm extends in a direction from the second rotation axis toward the link hook.

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