JPH11157369A - Seat with getting-in/out auxiliary structure and getting-in/out auxiliary accessory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve getting-in/out property without impairing safety and comfortableness in a sitting posture. SOLUTION: A bucket-like side part 12-2o of a getting-in/out side formed separately from a cushion body 12-1 of a seat cushion 12 is formed as a falling side part rotatable into a leveled position with a cushion face 12c almost horizontally arranged as an upper face, and under rotation followed by the descent of a front end, a seat face 12a of the cushion body can be set as a nearly horizontal face continuous with the cushion face 12c of the falling side part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat for a vehicle mounted on an automobile or the like, and more particularly, to a seat with a getting-on / off assisting structure for facilitating getting on / off of an elderly person, a disabled person, and the like, and an getting-on / off assisting device therefor.

[0002]

2. Description of the Related Art For example, in a seat cushion of an automobile seat such as a passenger car, a so-called rearward-sloping seat surface in which a bottom portion of a seat surface is set lower than a front position thereof, and left and right side portions of the seat surface are seated. A so-called bucket shape which is raised above the surface is generally used.

In a seat provided with a seat cushion having such a shape, the seat is seated in a tilted posture after the buttocks sink, so that the seating posture can be easily stabilized. And the movement of the occupant with respect to the seat, especially the movement of the buttocks and lower limbs in the left and right direction, is suppressed under the holding on the raised side, so that the comfort of the occupant and, consequently, the safety of the occupant are improved. It can be easily secured with excellent holdability (retention) and stability.

[0004]

In a seat of a passenger car or the like (automobile), since the passenger gets on and off through a door space on a side surface of the body, an outer side (outer side) in a width direction of the passenger car gets on and off the seat. Become the side. After the lower limb is moved from the door space to the outside of the vehicle, the operation of standing up sideways and leaning forward with respect to the seat is a general dismounting operation of a passenger car or the like.

[0005] By the way, in a sitting posture in which the hips are tilted backward after sinking, it is not easy to stand up from the posture, that is, to get off the vehicle. In particular, in the known seat, the side portion of the seat cushion has a bucket shape protruding from the seat surface. Therefore, even if the seating posture is changed to the seat sideways, this sideways posture is inclined after the buttocks sink. It is still a sitting posture. In addition, when riding, since the buttocks are greatly lowered by sitting, the balance of the riding operation is easily lost.

[0006] Normally, the difficulty in starting up when getting off the vehicle or the loss of balance when riding is compensated for by the support of the body's flexibility or strength, but the elderly or the inability of the body to have poor body flexibility or strength. This cannot be fully expected for such women. That is, even if the seat has a shape that is excellent in stability and comfort in a sitting posture, it is conceivable that the seat may hinder smooth and easy entry / exit of an elderly person or the like.

In addition, in the case of a physically handicapped person with a disability in the lower limbs (disabled person), the movement of the buttocks between the seating surface of the wheelchair and the seating surface of the seat arranged in the door space is the main reason for getting on and off. Operation. However, in the known sheet shape having a raised side, the height of the raised side is likely to hinder the movement of the buttocks. In addition, when a disabled person gets on and off, a caregiver often takes care of the patient, but since the door space of a car or the like is low and narrow, care by the caregiver is not easy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seat with a getting-on / off assisting structure and an getting-on / off assisting device for improving the getting-on / off property without impairing comfort and safety in a sitting posture.

[0009]

According to the present invention, there is provided a seat having a boarding / alighting assisting structure according to the present invention, wherein a seat cushion has a cushion body having an upper surface as a seating surface, and a cushion surface having a cushion surface on a cushion body side. Are formed separately from a pair of bucket-shaped side portions erected on the left and right sides of the cushion body, and of the pair of left and right bucket-shaped side portions, the butt portion is passed when getting on and off. The side portion on the side is formed as a collapsible side portion that functions as a getting-on / off assisting tool while being rotated and held at an inverted position where the cushion surface is substantially horizontal.

The cushion body is supported so as to be able to lower its front end under rotation about a fulcrum at the rear, and the seat surface of the cushion body is inverted by lowering the front end in accordance with a predetermined operation. It can be set as a substantially horizontal surface that is continuous with the cushion surface of the retractable side portion at the position.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1 and FIG. 2, in the seat 10 with the assisting structure for getting on and off according to the present invention, the seat cushion 12 having a seat-back tilting type has a cushion body 12- whose upper surface is a seat surface 12a. 1 and a pair of bucket-shaped side portions 12-2 erected on the left and right sides of the cushion body. Then, of the pair of left and right bucket-shaped side portions 12-2, for example, the side of the cushion body 12-1 where the occupant gets in and out of the cushion body 12-1, that is, the door space side (outer side) through which the buttocks of the occupant pass. 1) can function as a bucket portion of the seat cushion 12 in the upright position shown in FIG. 1 and function as a boarding / alighting aid in the inverted position shown in FIG. It is formed as a possible, collapsible side.

In the embodiment of the present invention, a seat (a seat with a getting-on / off assistance structure) 10 having the outer side with respect to the width direction of a passenger car or the like as viewed from the front and the inner side with respect to the right side is exemplified. This will be described below. That is,
As can be seen from FIGS. 1 to 3, the seat 10 has a bucket-shaped side portion 12-2 on the left side as viewed from the front.
However, it is set as the retractable side portion 12-2o.

As shown in FIGS. 1 and 3, a side portion 12 of an inner side (the center side of a passenger car, etc .; right side of the seat 10 as viewed from the front) with respect to a door space side (outer side) serving as a boarding / alighting side. -2i is formed as a fixed side portion which is fixed at the standing position.

As can be seen from FIG. 4 in addition to FIG.
The seat 10 includes, for example, a seat slide device 14. The seat slide device 14 includes, for example, a slide rail 18 slidable with respect to a guide rail 16, and is fixed to the seat cushion 12 and the guide rail to a floor or the like. The seat 10 is disposed at left and right (outer side, inner side) spaced positions with respect to the seat so as to be slidably supported in the front-rear direction (right and left directions in the figure).

As such a seat slide device 14, a known configuration disclosed in Japanese Patent Application Laid-Open No. 05-220025 or the like can be used without any change. Is not the purpose of the present invention and will not be described in detail here.

The seat cushion 12 is provided, for example, on a pair of left and right base plates 20o and 20i integrally provided on a slide rail 18 of a seat slide device.
12-1 and bucket-shaped side part 12-2 (foldable side part 12
-2o, can be assembled into the corresponding shape under the fixed side part 12-2i).

For example, as shown in FIG. 2, the fixed side portion 12-2i is located at an upright position where the cushion surface 12b is vertically arranged on the side of the cushion main body 12-1 via a pair of front and rear stays 22. It is connected and fixed to the base plate 20i on the corresponding side.

Here, as shown in FIGS. 5 and 6, in the present invention, the collapsible side portion 12-2o is unitized on the basis of a pair of mounting brackets 24, and via the mounting brackets. It is attached to the base plate 20o on the outer side, which is the entrance / exit side. Then, this retractable side part 12-2o is
It is configured to be rotatable between an upright position shown in FIG. 1 where the 12c is vertically arranged on the cushion body 12-1 side and an inverted position shown in FIG. 3 where the cushion surface is substantially horizontal.

The foldable side portion 12-2o is rotatably connected to a base frame 28 having a lower end rotatably connected to an upper end of a mounting bracket 24 via a support shaft 26 and a lower end of the mounting bracket. It has a combination with a link arm 30 holding and connecting the lower end 30a. Then, the upper end 30b of the link arm is slidably connected to the base frame 26 via the guide plate 31, so that the retractable side portion 12-2o can be rotated between the upright position and the inverted position. Is constituted.

In such a configuration, the guide plate 31, the rotation of the link arm 30 about the lower end 30a following the rotation of the base frame 26 about the support shaft 28,
By sliding the upper end 30b of the link arm with respect to the base frame, the range of rotation of the base frame with respect to the mounting bracket 24, that is, the range of rotation of the collapsible side portion 12-2o, is the same as the standing position shown by the solid line in FIG. It is defined between the inverted position shown by the two-dot chain line in the figure.

Here, as shown in FIGS. 5 and 6, in the embodiment of the present invention, the lower end 30a of the link arm
Are slidably held and connected to the mounting bracket 24 in the vertical direction (see the solid line and the dashed line in FIG. 5). Locking means 32 for holding the collapsible side portion 12-2o in the upright position under the lock is provided so as to be unlockable when the link arm 30 is pulled upward.

As the lock means 32, for example, a lock bar 34 fixedly installed and fixed between the left and right sides of the link arm 30
A configuration having a combination of a hook bar 36 that can be inserted and engaged with the lock bar can be used. The lock bar 34 is provided with a biasing force of a lock spring 40 formed of a tension coil spring stretched between the lock bar 34 and the locking piece 38 of the base plate 20o. Under this biasing force, the lock bar It is inserted into the hook piece 36 and biased in the engaging direction.

Then, as shown in FIG.
One end of a lock-off belt 42 serving as an unlocking piece when the 30 is lifted in the unlocking direction is connected to a connecting wire 44 erected and fixed between the left and right sides of the link arm, and the other ends are shown in FIGS. As shown in FIG.
Through the outer side of the collapsible side portion 12-2o.

As shown in FIGS. 1 and 4, the seat cushion 12 of the seat is of a seat-back backward-tilt type in which the seat surface is tilted rearward, so that the cushion body 12- having the upper surface as the seat surface 12a. 1 and 2 are arranged in a corresponding rearwardly inclined state. In the present invention, the cushion main body is moved under the front end down to a substantially horizontal position of the seating surface shown in FIGS. 3 and 7. It is rotatably connected to and supported by the base plates 20o and 20i.

As shown in FIGS. 2 and 4, for example, a support shaft 48 is provided between the rear portions of the base plates 20o and 20i via a bracket 50 or the like. The rear portion of the body frame 52 is rotatably connected by holding the support shaft by the holding member 54. Further, the front portion of the cushion body 12-1 is supported so as to be able to move up and down the front end thereof by a lifting / lowering means 60 having a link arm 58 which can rotate in the vertical direction in conjunction with the operation lever 56.

The lifting means 60 at the front is provided with an operation lever 56.
Any structure that allows the front end of the cushion body 12-1 to be held in the rearwardly inclined position of the seat surface 12a by the elevation of the front end accompanying the rotation of the link arm 58 in conjunction with Since this is not the purpose of the present invention, a detailed description is omitted here.

For example, the state shown in FIGS. 1 and 4, that is, the standing state of the retractable side portion 12-2o in a normal sitting state,
Also, a rearwardly inclined state of the cushion body 12-1 in which the seat surface 12a is inclined rearward is assumed to be an initial state of the seat 10. When the occupant gets off the seat 10 from the initial state of the seat 10, first, the lock-off belt (lock release member) 42 lifts the link arm 30 against the biasing force of the lock spring 40 to lock the seat. The engagement between the lock bar 34 and the hook piece 36 of the means is released (see FIGS. 5 and 6). Then, in the unlocked state of the lock means 32, the outwardly foldable side portion is provided.
By the rotation of 12-2o, that is, the inversion, the inversion position of the reversible side portion that makes the cushion surface 12c substantially horizontal as shown in FIGS. 3 and 7 is set (see the two-dot chain line in FIG. 5).

Next, the cushion body 12-1 is rotated under the lowering of the front end of the cushion body 12-1 by the rotation operation of the operation lever 56 to move the cushion body to the seat surface 12a.
Is set and held at the lower position of the substantially horizontal front end of.

The collapsible side portion 12-2 shown in FIGS.
o, the cushion surface 12c of the collapsible side portion and the seating surface 12a of the cushion body 12-1 are set as substantially continuous horizontal surfaces, at the inverted position of the cushion body 12-1 and the seat surface 12a of the cushion body 12-1. This is the boarding / alighting assist state of the seat 10.

In such a state where the seat 10 is getting on and off, it is sufficient to move the buttocks to the door side on a horizontal plane where the cushion surface 12a of the cushion body and the cushion surface 12c of the collapsible side are sufficient. In this case, the buttocks can be easily moved. By placing the buttocks on the cushion surface 12c of the collapsible side portion, it is possible to easily move the lower limbs from the door space to the outside of the vehicle and the sideways forward leaning seating posture facing the outside of the vehicle, and It is sufficient to stand up from a forward leaning seating posture in a state of being seated on the cushion surface of the collapsible side portion, so that even a weak elderly person or the like can easily get off the vehicle without disturbing the posture and without relying on arm strength.

Even for a disabled person with a disability in the lower limbs, shifting the position of the buttocks on the continuous horizontal plane of the cushion surface 12a of the cushion main body and the cushion surface 12c of the collapsible side portion is not possible. It can be performed relatively easily even under strength. And, if it is a side-to-side sitting posture in which the user is seated on the retractable side portion 12-2o in the inverted position, and furthermore, the lower limbs are moved out of the vehicle,
Even when a caregiver is required, the care space where the caregiver is located can be widely secured beside the door space, so that the getting-off operation does not become complicated.

After the seated person gets off the vehicle,
If the 12-2o is turned from the laid position to the erected position, the tiltable side portion is held at the erected position under the lock of the lock means 32. At this time, since the reversible side portion 12-1 and the cushion main body 12-2o are not interlocked, the front end of the cushion main body is lowered, that is, the seat surface 12a is kept substantially horizontal.

At the time of re-boarding after the occupant gets off the vehicle, if the retractable side portion 12-2o is turned and set from the standing position to the inverted position, the retractable side portion 12-2o can be moved in the same manner as when getting off. A substantially continuous horizontal surface of the cushion surface 12c of the portion and the seat surface 12a of the cushion body is formed on the seat cushion 12. Then, the occupant sits down on the cushion surface 12c of the collapsible side portion, moves the lower limbs into the vehicle, slides the buttocks on the cushion surface 12a of the cushion body, and sits down. It is possible to rotate the cushion body 12-1 in the backward tilt direction by rotating the portion 12-2o in the upright position direction and raising the front end under the rotation operation of the operation lever 56 backward. The inverted side portion and the cushion body are returned to the initial positions shown in FIGS. 1 and 3 (see the solid line in FIG. 5).

As described above, in the seat 10 with the assisting structure for getting on and off according to the present invention, the retractable side portion 12-2o of the outer side serving as the getting on and off side is rotated to the inverted position where the cushion surface 12c is substantially horizontal. In addition to being settable, the seat surface 12a of the cushion main body 12-1 is set as a horizontal surface continuous with the cushion surface under the lowering of the front end, and this is the seat getting on / off assist state. Therefore, in this getting-on / off assistance state, the movement of the buttocks on the seat cushion 12 at the time of getting on and off can be easily performed without greatly lifting the buttocks, thighs, and the like.

Then, at the time of getting on and off, it is sufficient to perform the getting-off operation and the getting-on operation once sitting on the cushion surface 12c of the retractable side portion at the inverted position, so that the posture at the time of getting on and off can be surely collapsed. This can be prevented, and support with arm strength and the like is not particularly important. Therefore, even the elderly and the disabled can easily get on and off.

In a normal sitting state, the seating surface 12a of the cushion main body can be set to the backward inclined state.
By holding the retractable side portion 12-2o in the upright position, the retractable side portion functions as the bucket portion of the seat cushion 12 together with the other fixed side portion 12-2i, so that supportability when sitting is improved. There is no loss. In other words, according to the seat 10 of the present invention, it is possible to easily secure a boarding / alighting assisting structure for easily getting on and off the elderly person without impairing the supportability,
Both supportability and getting on and off can be achieved.

Further, in the present invention, the seat surface 12a is set to be substantially horizontal when the front end of the cushion body 12-1 is lowered, so that the seat surface can be lowered in the horizontal state. Therefore, the present invention can be particularly effectively used as a so-called one-box, RV car, or other seat in which the seat 10 is set at a relatively high position.

The collapsible side portion 12-2o has a link arm 30 held at the upper end 30b by a guide plate 31, and the upper end of the link arm with respect to the guide plate is slid. 28, and thus the range of rotation of the collapsible side part, and because it is supported by this link arm, the cushion surface 12
The load acting on c, that is, the weight of the occupant is released to this link arm (see the two-dot chain line in FIG. 5). Therefore,
The supporting force at the collapsible side portion 12-2o can be obtained sufficiently high without complicating the configuration, and the collapsible side portion excellent in functionality, stability, or safety can be easily secured.

In the present invention, since the getting-on / off assist device embodied as the tiltable side portion 12-2o is unitized in advance, the work of assembling the seat 10 is facilitated. And since it can be handled as a single unit, the collapsible side part 12-o which becomes this getting on and off aid
Can be sufficiently applied to seats of other types of vehicles.

For example, the foldable side portion 12-2o may be applied as an emergency seat or other auxiliary seat of a third seat in a minivan type automobile or the like.

In the present invention, the locking means 32
Is embodied as a configuration in which the lock is released when the link arm 30 is moved up and down, but the locking means is not limited to this configuration, as long as it is possible to switch between lock and unlock. The locking means 32 is not limited to the configuration in which the lock is performed only in the standing position, and the locking means 32 may be configured to be lockable in both the standing position and the inverted position.

It should be noted that the seat with a getting-on / off assist structure of the present invention is provided.
10. The boarding / alighting assist structure in 10, that is, the reversible side part 12-2o that can be inverted and the front-end descendable cushion body 12-1
The structure provided with is not limited to getting on and off of a disabled person, an elderly person, and the like, and may be used at the time of getting on and off of another seated person. In other words, if this seat 10 getting-on / off assisting structure is used, once sitting on the cushion surface 12c of the collapsible side portion 12-2o, it is possible to get on and off without greatly opening the legs, so that a skirt, a kimono, etc. It can be used particularly effectively when getting on and off a woman who has taken off.

In this embodiment, a seat slide device 14 represented by a front seat of an automobile is used.
Although the configuration having the above is exemplified as the seat 10, the seat is not limited to this as it is sufficient if the seat is adjacent to the door space. For example, a body type such as a 4-door sedan (also referred to as a saloon) or a station wagon is used. This seat may be disposed on the rear seat of the car, or on the second seat on the door side of one box, RV car, or the like.

The seat is not limited to a seat for a passenger car or the like, and can be sufficiently applied to, for example, a seat of another vehicle such as a train, a ship, an airplane, or various seats of an entertainment facility.

The embodiments of the present invention described above are intended to explain the present invention, and do not limit the present invention in any way. Modifications, alterations, and the like within the technical scope of the present invention may also be made. It goes without saying that all are included in the present invention.

[0047]

As described above, according to the seat with the boarding / alighting assist structure according to the present invention, the boarding / alighting assist system in which the cushion surface of the retractable side portion of the boarding / alighting side and the seating surface of the cushion body are substantially continuous on a horizontal plane. Since the state can be set, it is possible to easily move the buttocks on the seat cushion when getting on and off. That is, it is possible to reliably prevent the posture from being disturbed when getting on and off, and it is also not particularly important to support with arm strength and the like, so that the getting on and off of the elderly and the disabled can be improved.

When the vehicle is running or the like, the seating posture of the rearward inclination can be ensured, and the collapsible side portion is held in the standing position so that the collapsible side portion and the other fixed side portion together with the seat cushion can be secured. Since it functions as a bucket portion, it is possible to achieve both supportability and getting on and off without impairing the supportability at the time of sitting.

Further, since the cushion body rotates under the lowering of the front end, it is possible to lower the seat surface in a horizontal state. Therefore, the present invention can be particularly effectively used as a seat for a vehicle type or the like in which the seat is set at a relatively high position.

Further, since the collapsible side portion at the inverted position is supported by the link arm, a high supporting force can be easily obtained without complicating the configuration. A collapsible side part with excellent safety can be easily secured.

Further, according to the folding side portion which has been unitized in advance as a getting-on / off assistance tool, the work of assembling the seat can be facilitated. And since it can be handled as a single unit, this getting-on / off aid can be sufficiently applied to seats of other types of vehicles. Furthermore, not only as getting on and off aids, but also as emergency seats and auxiliary seats,
Its scope can be expanded.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a seat with a getting-on / off assistance structure according to the present invention in an initial state.

FIG. 2 is a partially exploded schematic perspective view of a seat with a getting-on / off assistance structure.

FIG. 3 is a schematic perspective view of a seat with a boarding / alighting assist structure in a boarding / alighting assist state;

FIG. 4 is a schematic side view of the seat with a getting-on / off assistance structure in an initial state.

FIG. 5 is a schematic sectional view of a collapsible side portion.

FIG. 6 is a schematic perspective view of a collapsible side portion showing an internal structure.

FIG. 7 is a schematic side view of a seat with a boarding / alighting assist structure in a boarding / alighting assist state.

[Explanation of symbols]

 10 Seat with boarding / alighting assist structure 12 Seat cushion 12-1 Cushion body 12-2o Folding side part (Getting on / off aid) 12-2i Fixed side part 12a Cushion body seating surface 12c Folding side part cushion surface 32 Locking means

Claims (7)

[Claims] 1. A seat provided with a seat cushion of a seat-back tilting type in which a rear end position of the seat surface is set lower than a front position thereof, wherein the seat cushion has a top surface thereof as a cushion body; And a pair of bucket-shaped side portions erected on the left and right sides of the cushion body. The side part on the side where the buttocks pass is formed as a retractable side part that functions as a getting-on / off aid under rotation and holding to an inverted position where the cushion surface is a substantially horizontal upper surface, The cushion body is supported so that the front end thereof can be lowered under rotation about the fulcrum at the rear part. By lowering the front end with a predetermined operation, the seat surface of the cushion body can be moved to the inverted position. Defeat rhino Passenger assist structure with sheets, characterized in that a settable as a generally horizontal plane continuous with the cushion surface parts. 2. A seat provided with a seat cushion of a seat-back tilting type in which a bottom portion of the seat surface is set lower than a front position thereof, wherein the seat cushion has a top surface thereof as a cushion body; And a pair of bucket-shaped side portions erected on the left and right sides of the cushion body. The side part on the side through which the buttocks pass is rotatable with the lower end of the base frame above the mounting bracket and the lower end of the link arm below the mounting bracket, which are fixed to a predetermined fixing member. And a mechanism part of which the upper end of the link arm is slidably connected to the base frame; insertion of the lock bar into the hook with a predetermined biasing force, And a lock means for enabling the rotation of the base frame to be defined at a specific position, and can function as a boarding / alighting aid with the rotation and holding to the inverted position where the cushion surface is substantially horizontal. And the cushion body is supported so as to be able to lower its front end under rotation about the fulcrum of the rear part. A seat with a boarding / alighting assisting structure, wherein a seat surface of a main body can be set as a substantially horizontal surface that is continuous with a cushion surface of a retractable side portion at an inverted position. 3. A lower end of the link arm is vertically slidably held and connected to a lower end of the mounting bracket, and the link arm is lifted upward against the mounting bracket against a predetermined biasing force. 3. The seat with a boarding / alighting assisting structure according to claim 2, wherein the lock means can be unlocked by the lock. 4. An upper end of the link arm is connected to the base frame via a guide plate capable of defining a sliding range thereof in a range corresponding to the rotation of the retractable side portion between the upright position and the inverted position. 4. The seat with a boarding / alighting assist structure according to claim 2, wherein the retractable side portion can be set and held at the inverted position by restricting sliding of the upper end of the link arm at the inverted position side. 5. A lower end of a base plate is connected to an upper part of a mounting bracket fixed to a predetermined fixing member, and a lower end of a link arm is rotatably connected to a lower part of the mounting bracket. To
A mechanism slidably connected to the base frame; locking means for enabling the rotation of the base frame to be specified at a specific position under insertion and engagement of the lock bar into the hook with a predetermined biasing force. And a unit is previously formed into a form in which one plane is a cushion surface, and the cushion surface is a substantially vertical surface, and an upright position held by a locking means, and the cushion surface is a substantially horizontal upper surface. An assisting device for getting on and off the seat, which is formed to be rotatable with respect to the inverted position and to be held at each position. 6. A lower end of a link arm is vertically slidably held and connected to a lower end of a mounting bracket, and the link arm is lifted upward against a mounting bracket against a predetermined biasing force. The seat getting-on / off assisting device according to claim 5, wherein the lock means can be unlocked by the lock. 7. An upper end of a link arm is connected to a base plate via a guide plate capable of defining a sliding range of the link arm in a range corresponding to a rotation between an upright position and an inverted position,
7. The seat getting-on / off assisting device according to claim 5, wherein the seat getting-on / off assisting device is set and held at least at the inverted position by restricting sliding of the upper end of the link arm on the inverted position side.