JP6326090B2 - Lifting shelf - Google Patents

Description

  The present invention relates to a lifting shelf.

  Conventionally, as shown in FIG. 9, a shelf member 91 for placing a storage item and a fixed housing 96 having a shelf housing chamber 90 for housing the shelf member 91 are provided. An elevating shelf in which the distal end side of the parallel link member 92 is pivotally attached to the side wall portion and the proximal end side of the parallel link member 92 is pivotally attached to the shelf member 91 is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-286131

The conventional lifting shelf has an arcuate shape in which the shelf member 91 bulges forward from the storage position when the shelf member 91 stored in the shelf storage chamber 90 is pulled out as shown by a two-dot chain line in FIG. While drawing the trajectory, it is pulled out to the user side, and as shown by the solid line, the descent is completed.
In this lowered state, in order to prevent the parallel link member 92 from interfering with the lower wall portion 90d of the shelf accommodating chamber 90, the swing is stopped at a position where the parallel link member 92 assumes a horizontal posture. ing. Therefore, there is a problem in that the amount of shelf lowering H from the predetermined storage position to the descent completion position is small, and it is difficult to put in and out the stored items with respect to the shelf member 91 at the descent completion position.
Further, in order to increase the shelf lowering amount H, if the bottom wall portion 90d is moved downward and the parallel link member 92 is allowed to swing downward beyond the horizontal, the bottom after the relocation is moved in the shelf storage state. The gap dimension h between the wall portion 90d ′ and the shelf member 91 at the predetermined storage position becomes large, which causes a problem that the shelf storage chamber (shelf storage space) 90 becomes uselessly large. In addition, if the rocker is largely swung downward beyond the horizontal, there arises a problem that the rear wall portion 91e of the shelf member 91 interferes with the front portion of the fixed housing 96 in the lowered state.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevating shelf that can increase the amount of lowering of the shelf member and make it possible to form and store the storage space compactly while facilitating taking in and out the stored items.

In order to achieve the above object, an elevating shelf according to the present invention comprises a pair of left and right rails that are fixed to a fixed portion and provided horizontally in the front and rear direction, a slide member that can reciprocate back and forth along the rails, and storage items. In one of the first link member and the second link member constituting the parallel link member, the parallel link member having the distal end side pivotally attached to the shelf member for placement and the proximal end side pivotally attached to the slide member A first connection link member having one end pivotally attached to an extending portion extending beyond a pivot point with the slide member; and the first connection link member pivotally connected to the other end of the first connection link member and fixed. A second connecting link member pivotally supported by a portion, and a connecting link member that connects the slide member and an intermediate portion of the first connecting link member, and the vertical link swings as the parallel link member moves up and down. Reciprocating slide member Allowed by those configured to the front and rear horizontal movement while the rack member is vertically swung.
In addition, a spring member is provided that elastically biases the parallel link member in the upward swing direction in the middle of the vertical swing of the parallel link member.

  According to the present invention, the shelf member can be largely pulled out from the storage position, and the stored items can be easily taken in and out of the shelf member at the descent completion position. The stored items can be used safely without being overturned, and can be made compact by eliminating the waste of the shelf storage space.

FIG. 2 is a cross-sectional side view of a main part in a shelf storage state according to the embodiment of the present invention. It is a principal part cross-section side view in the middle of a shelf raising / lowering state. It is a principal part cross-section side view in the middle of a shelf raising / lowering state. It is a principal part sectional side view of a shelf descent completion state. It is action explanatory drawing of a shelf descent completion state. It is a simplified block diagram for demonstrating an effect | action. It is a vector diagram for explaining the force which acts, (a) is a vector diagram of the force which acts on the 1st connection link member at the 1st connection pivot point, (b) is the 2nd base end pivot connection It is a vector diagram of the force acting on the second link member at a point, (c) is a vector diagram of the force acting on the slide member at the second proximal end pivot point, and (d) is the first connection pivot point. It is a vector diagram which acts on a slide member. It is a side view which shows an example of a spring member. It is a cross-sectional side view for demonstrating the problem of a prior art.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
As shown in FIGS. 1 to 4, the elevating shelf according to the present invention includes a pair of left and right rails 5, 5 fixed to a fixed portion 6 in a front-rear horizontal manner, and a slide member that can reciprocate back and forth along the rails 5. 3 and a parallel link member 2 whose distal end side is pivotally attached to the side wall portion 11 of the shelf member 1 for placing the stored items and whose proximal end side is pivotally attached to the slide member 3. The shelf storage state stored in the predetermined storage position and the shelf descent completion state (see FIG. 4) pulled out from the predetermined storage position to the front lower position can be switched.

In the illustrated embodiment, the fixing unit 6 is a housing type (fixed housing) fixed to a wall surface or a column above a sink or a cooking table (not shown).
The housing-type fixing part (fixed housing) 6 is provided in an upper front opening-like shelf accommodating chamber 61 in which the shelf member 1 can be accommodated, and in the lower position of the shelf accommodating chamber 61, and can store other items to be stored. It is a box shape of the front opening shape of the upper and lower multi-stage type (two-stage type) having the lower front opening-shaped storage chamber 62. Although not shown, a door member may be attached to the front opening.
In the present invention, the fixed portion 6 is not limited to the case type (fixed case) shown in the figure, but the fixed portion itself such as a wall or a column above a sink or a cooking table (not shown), or its fixed portion. It may be a plate-like or bar-like fixing member (fixing bracket) fixed to the installation part. Moreover, not only a housing | casing type (box type) but a frame type may be sufficient. In other words, the fixing portion 6 is disposed at positions corresponding to the left and right sides of the shelf accommodating space 90, and any shape and number may be used as long as the rail 5 and the second link member 72 can be attached.

  The shelf member 1 includes a pair of left and right side wall portions 11, 11, a rod-shaped member 12 that connects a hanging portion 11 c that extends downward from the front lower portion of each of the left and right side wall portions 11, 11, and the rod-shaped member 12. The operation bar member 13 is attached in a hanging manner and slidable to the left and right along the rod-like member 12, and a horizontal plane placement on which the stored items are placed between the left and right side walls 11, 11. Part 16.

The slide member 3 includes a traveling member 31 that can reciprocate linearly back and forth along the rail 5 and an attachment member 32 that is fixed to the traveling member 31 in an upright manner.
The slide member 3 is disposed at a predetermined rear position along the rail 5 in the shelf accommodating chamber 61 in a side view in the shelf storage state, and a predetermined along the rail 5 in the shelf lowering completion state. It is disposed at the front position.

The parallel link member 2 includes a first link member 21 and a second link member 22.
The distal end portion 21a of the first link member 21 and the distal end portion 22a of the second link member 22 are pivotally attached to the upper rear portion of the side wall portion 11 of the shelf member 1 with left and right horizontal pivot axes.
The base end portion 21b of the first link member 21 and the base end portion 22b of the second link member 22 are pivotally attached to the attachment member 32 of the slide member 3 with left and right horizontal pivot axes.

  As viewed from the side, the pivot point of the first link member 21 and the shelf member 1 (first distal pivot point) P1, and the pivot point of the first link member 21 and slide member 3 (first proximal pivot point) P2, a pivot point (second tip pivot point) P3 of the second link member 22 and the shelf member 1, and a pivot point (second pivot point) P4 of the second link member 22 and the slide member 3 Is arranged at the apex position of the parallelogram in a side view. In the illustrated example, the second base end pivot point P4 is disposed behind and above the first base end pivot point P2.

  In the shelf storage state, the first link element straight line J1 indicated by the alternate long and short dash line connecting the first tip pivot point P1 and the first base pivot point P2, the second tip pivot point P3, and the second base pivot point The second link element straight line J2 indicated by the alternate long and short dash line connecting P4 is inclined upward rearward.

Further, a first connecting link member 71 in which one end portion 71a is pivotally attached to the extending portion 22c extending beyond the second base end pivot point P4 in the second link member 22 with a left and right horizontal pivot axis. It has.
In a side view, a pivot point (first coupling pivot point) P5 between the first link member 71 and the second link member 22 is disposed on an extension line of the second link element straight line J2.

One end 72a is pivotally connected to the other end 71b of the first connecting link member 71 with a left and right horizontal pivot axis, and a fixed portion 6 (a fixed pivot portion 69 provided at the back of the shelf accommodating chamber 61). The other end portion 72b is provided with a second connecting link member 72 that is pivotally supported with a horizontal horizontal pivot axis.
The second linking link member 72 and the pivot point (fixed side pivot point) P9 of the fixed portion 6 are disposed at a position behind the slide member 3 in a side view.
In the shelf storage state, the first connecting link element straight line connecting the pivot point (second coupling pivot point) P8 of the first coupling link member 71 and the second coupling link member 72 and the first coupling pivot point P5. J71 is held in a forward downward inclined (backward upward inclined) posture.
In the shelf storage state, the second connection link element straight line J72 connecting the fixed side pivot point P9 and the second connection pivot point P8 is held in a forward upward inclined (backward downward inclined) posture.

The first connecting link member 71 and the second connecting link member 72 constitute an interlocking link portion 70 that connects the slide member 3 and the housing-type fixing portion 6 (the fixed pivot portion 69 thereof).
In the shelf storage state, the first connecting link element straight line J71 and the second connecting link element straight line J72 are provided so as to draw an inverted V-shaped link element line.
The first connection link element straight line J71 and the second connection link element straight line J72 are provided so as to draw a link element line having a square shape or a single character shape in the shelf descent completion state.

Furthermore, the connecting link member 7 which connects the intermediate part 71d of the 1st connection link member 71 and the slide member 3 is provided.
The connection link member 7 has one end portion (upper end portion) 7a pivotally attached to the slide member 3 with a horizontal horizontal pivot axis, and the other end portion (lower end portion) 7b pivoted horizontally to the first connection link member 71. It is pivotally attached with a center axis.

In the shelf storage state, the connection link member 7 has a pivot point (first connection pivot point) P6 with the slide member 3 and a pivot point (second connection pivot) between the first connection link member 71 in a side view. The connecting link element straight line J7 connecting the landing point P7 is provided so as to be inclined forward and downward (upwardly inclined backward).
The connection link member 7 is provided such that the lower end portion 7b swings in a downward projecting arcuate locus with the first connection pivot point P6 as the swing center.
The second connection pivot point P7 is disposed on the first connecting link element straight line J71.

  The connecting link member 7 has an interlocking link portion 70 with an inverted V-shaped posture in the shelf storage state and a letter shape or a single character shape in the shelf descent completion state around the second connection pivot point P8. The first connecting link member 71 is regulated (controlled) so that it can be opened and closed freely in the posture.

Here, the posture of the parallel link member 2, the posture of the connection link member 7, and the posture of the interlocking link portion 70 (first and second connecting link members 71 and 72) are independent of the appearance (outer shape) posture. It calls with the posture of the element straight line.
That is, in the shelf storage state, the parallel link member 2 is in a backward upward inclined posture, the connection link member 7 is in a backward upward inclined posture, and the interlocking link portion 70 is in an inverted V-shaped posture.
In the shelf descent completion posture, the parallel link member 2 is in a forward downward inclined posture, the connection link member 7 is in an upward upward inclined posture, and the interlocking link portion 70 includes the first connection link member 71 and the second connection link member. 72 is inclined upward and has a generally square shape or a single character posture (a linear posture of less than 180 degrees).

Further, as shown in FIG. 8, the parallel link member 2 is elastically applied to the left and right outer side mounting portions 32g of the mounting member 32 of the slide member 3 in the upward swinging direction while the parallel link member 2 is swinging up and down. A spring member 80 made of a spiral spring for biasing is provided.
As shown in FIGS. 1 and 8, a transmission rocking member 82 that receives the elastic force from the spring member 80 (directly) and whose front end 82 a is rockable back and forth, and a transmission rocking member 82. A distal end portion 81b is pivotally attached to the distal end portion 82a, and a distal end portion 81a is pivotally attached to an intermediate portion 22d of the second link member 22 of the parallel link member 2.
As shown by an arrow Y in FIG. 8, the spring member 80 is always elastically biased so that the tip end portion 82a of the transmission swing member 82 is directed rearward and downward.
That is, the spring member 80, the transmission rocking member 82, and the transmission connecting member 81 constitute an ascending load reducing means (an ascending assist means) 8 for reducing an operation force for raising the shelf member 1.

The parallel link member 2, the slide member 3, the rail 5, the interlocking link portion 70, the connection link member 7, the rising load reducing means 8, and the fixed pivot portion 69 are provided in a pair of left and right (the housing-type fixing portion 6. Provided on both the left and right sides).
Although not shown, a rod-shaped slide connecting member that connects the left and right slide members 3 and the left and right slide members 3 in the left-right direction is provided. The pair of left and right slide members 3 and 3 travels synchronously (moves at the same speed) by the slide connecting member, and the travel amount does not differ between the left and right, enabling smooth reciprocation.
Although not shown in the drawing, a rod-like parallel link connecting member that connects the left and right first link members 21 and the left and right other first link members 21 in the left and right directions is provided.
The operation of the parallel link member 2 is synchronized on the left and right, and can be smoothly swung without being twisted.

Next, the usage method (action | operation) of the raising / lowering shelf of this invention is demonstrated.
As shown in FIG. 1, in the shelf storage state, the shelf member 1 is disposed at a predetermined storage position in the shelf storage chamber 61 by the elastic biasing force of the spring member 80, the weight of the shelf member 1, and the load of the storage items. Has been. Further, at least one of the backward swing of the shelf member 1, the backward swing of the parallel link member 2, and the backward travel of the slide member 3 is blocked by a rear blocking stopper portion (not shown). Therefore, the shelf member 1 is held in a horizontal posture, and the slide member 3 is disposed at a predetermined rear position.

  When the user applies an operating force that grips the operating bar member 13 and pulls it forward and downward, as shown in FIG. Advance.

Here, advancement of the slide member 3 will be described with reference to FIGS. 6 and 7.
First, as shown in FIG. 6, the first connecting link member 71 receives a downward and rearward force F8 by the second connecting link member 72 at the second connecting pivot point P8, and at the second connecting pivot point P7. The connecting link member 7 receives the upward and backward force F7. Therefore, at the first connection pivot point P5, as shown in FIGS. 6 and 7A, the resultant force Fa of the force F7 and the force F8 is generated toward the rear side.

  Next, as shown in FIG. 6, the reaction force Fb of the resultant force Fa toward the rear side described above is generated in the second link member 22 at the first connection pivot point P5. Further, the second link member 22 receives the forward and downward external force F3 by the operation of the shelf member 1 at the second tip pivot point P3. Therefore, at the second base end pivot point P4, as shown in FIG. 6 and FIG. 7B, the resultant force F4 of the external force F3 to the front lower side and the reaction force Fb to the front side described above is the front. It occurs toward the side.

  And since the 2nd link member 22 is pivotally attached to the slide member 3 in the 2nd base end pivot point P4, as shown in FIG.7 (c), the slide member 3 is the horizontal of the resultant force F4 to the front side. Receives component Ea and vertical component Eb. Since the slide member 3 is held on the rail 5 so as not to move up and down, a forward horizontal component Ea acts.

Furthermore, as shown in FIG. 6, the connection link member 7 receives a forward and downward force F6 that opposes the force F7 at the first connection pivot point P6. And since the connection link member 7 is pivotally attached to the slide member 3 at the first connection pivot point P6, as shown in FIG. 7 (d), the slide member 3 is at the first connection pivot point P6. The horizontal component Ec and the vertical component Ed of the force F6 toward the front and lower side are received.
Since the slide member 3 is held on the rail 5 so as not to move up and down, a forward horizontal component Ea acts.

  Therefore, when an operating force is applied to the shelf member 1, the slide member 3 has a horizontal component Ea acting on the second base pivot point P4 and a horizontal component Ec acting on the first connection pivot point P6. The combined force acts as a forward force (propulsive force). In addition, although illustration is omitted, of the operating force applied to the first link member 21, the force of the horizontal component forward acts on the slide member 3 as a forward force.

  As shown in FIGS. 2 and 3, the extending portion 22c is swung while the parallel link member 2 is swung so as to be in a horizontal posture (the first link element straight line J1 and the second link element straight line J2 are horizontal). Swings upward around the second base end pivot point P4, and the interlocking link portion 70 opens from the inverted V-shaped posture to the shape of the top, and the slide member 3 travels (slides) forward.

  Further, as shown in FIG. 4, the extending portion 22c swings upward around the second base end pivot point P4 while swinging so that the parallel link member 2 is in a forward downward inclined posture, and the interlocking link. The part 70 opens linearly, and the slide member 3 travels forward. In the state where the shelf member 1 is disposed at the predetermined lowering completion position, at least one of the lowering of the shelf member 1, the downward swing of the parallel link member 2, and the forward travel of the slide member 3 is not shown. By blocking at the part, the shelf member 1 is held at the descent completion position (posture) by its own weight.

  That is, when the user tries to pull out the shelf member 1 forward and downward, as shown in FIGS. 2 to 4, the parallel link member 2 swings from the backward upward inclined posture to the forward downward inclined posture, and the parallel link. The base end side of the member 2 is horizontally moved forward from the predetermined rear position to the predetermined front position by the slide member 3. That is, the shelf member 1 descends after slightly rising while horizontally moving forward.

Here, in the reference example shown by the two-dot chain line in FIG. 5, the slide member 3 is not provided (the slide member 3 does not move), and the reference first link element straight line J1 ′ and the reference second link element straight line are provided. J2 'is horizontal and the descent is complete.
Compared with the reference example shown by the two-dot chain line, the embodiment shown by the solid line is the pivot point (first base pivot point P2 and second base point) that is the pivot center point of the parallel link member 2. The end pivot point P4) can be disposed at the front opening edge of the shelf accommodation chamber 61 of the housing-type fixing portion (fixed housing) 6, and the parallel link member 2 is arranged in the housing-type fixing portion 6 (shelf housing chamber 61). The lower wall portion 65) can be swung forward and downward without interfering with the lower wall portion 65).

That is, the first link element straight line J1 and the second link element straight line J2 can swing in a forward and downward inclined posture beyond the horizontal, and the shelf member 1 is positioned below the shelf member 1 ′ of the reference example. It is arranged.
It is preferable that the downward tilt angle θ between the horizontal plane (line) K and the first and second link element straight lines J1 and J2 is set to 20 degrees or more and 70 degrees or less. If it is less than 20 degrees, the amount of descent is small, and if it exceeds 70 degrees, it is necessary to reduce the longitudinal dimension of the housing-type fixing part 6 in order to prevent interference with the front part of the housing-type fixing part 6. As a result, the shelf member 1, the shelf accommodation room 61, and the accommodation room 62 become smaller and the accommodation capacity is reduced.

When the user grasps the operating rod member 13 and operates the shelf member 1 to raise from the shelf lowering completion state, the distal end portion 2a of the parallel link member 2 starts ascending and swinging and the slide member 3 is moved. Starts running backwards.
Further, since the parallel link member 2 is elastically biased in the upward swinging direction by the spring member 80 in the middle of the shelf rising state (in the upward swinging state of the parallel link member 2), The load on the shelf member 1 and the like is reduced, and the shelf member 1 can be easily raised.
4, 3, 2, and 1, the parallel link member 2 swings upward (from the forward downward inclined posture to the backward upward inclined posture) and the slide member 3 moves horizontally backward. Then, the shelf member 1 returns to the predetermined storage position.
In the middle of the shelf lowering state (the state in which the parallel link member 2 is swinging downward), since the parallel link member 2 is elastically biased in the upward swing direction by the spring member 80, the shelf member 1 is rapidly lowered. Can be prevented and can be safely lowered.

  In addition, since the parallel link member 2 can be moved forward to have a downwardly inclined posture in the vicinity of the opening edge, the base end side (first base end pivot point P2) of the parallel link member 2 is Further, the lower wall portion (upper and lower partition wall portions) 65 of the shelf accommodating chamber 61 can be disposed close to the shelf accommodating chamber 61, and the lower space can be effectively used without wasting the shelf accommodating chamber (shelf accommodating space) 61. That is, the storage chamber 62 that can store other storage items can be provided large (wide) below the shelf storage chamber 61.

  In the present invention, the design can be changed, and the slide structure of the rail 5 and the traveling member 31 is provided in the traveling member 31 or a structure in which a plurality of spheres are interposed between the rail 5 and the traveling member 31. A structure in which the wheel rolls along the rail 5, a linear guide structure, and the like are free. The spring member 80 may be a compression coil spring, a tension coil spring, a gas spring, or the like. Alternatively, the left and right second link member 22 and the left and right second link member 22 may be connected by a parallel link connecting member. The extending portion 22c may be provided on the first link member 21, and the one end portion 71a of the first connecting link member 71 may be pivotally attached. The pair of parallel link members 2 and 2 only need to be pivotally attached to the left and right sides of the shelf member 1, respectively.

Further, in the present invention, providing on the left and right sides of the housing-type fixing portion (fixed housing) 6 (pivoting, attaching, fixing) means that the left and right side wall portions 67, 67 are directly or on the attachment assisting member. And the case where it is attached directly or indirectly near the left and right side edge portions of the front wall portion and the rear wall portion. That is, not only when the rail 5 and the second connecting link member 72 are directly or indirectly attached to the side wall 67 (fixed pivot support 69), the front end of the rail 5 is fixed to the front wall and the rear. When the end portion is fixed to the rear wall portion and provided in the vicinity (side) of the side wall portion 67, or a fixing portion 69 projecting inward of the fixing portion 6 from the left or right side edge of the rear wall portion or the front wall portion ( Including the case where it is attached to an attachment auxiliary member).
In the present invention, the parallel link (parallel link member 2) is a modified parallel in which the pivot points P1, P2, P3, and P4 are arranged at the vertex positions of a non-parallelogram rectangle in a side view. Including the case of a link (deformed parallel link member).

  As described above, the lifting shelf of the present invention includes a pair of left and right rails 5 and 5 that are fixed to the fixing portion 6 and provided horizontally in the front and rear direction, and a slide member 3 that can be moved back and forth along the rail 5. A parallel link member 2 whose front end side is pivotally attached to the shelf member 1 for placing stored items and whose base end side is pivotally attached to the slide member 3, and a first link member 21 constituting the parallel link member 2. And a first connection link member 71 having one end 71a pivotally attached to an extending portion 22c extending beyond the pivot point P4 with the slide member 3 on one of the second link members 22, and a first connection link member The connection link member 7 that connects the second connection link member 72 pivotally connected to the other end 71b of the 71 and pivotally supported by the fixed portion 6, and the intermediate portion 71d of the slide member 3 and the first connection link member 71. And slides as the parallel link member 2 swings up and down Since the material 3 is reciprocated back and forth so that the shelf member 1 moves back and forth horizontally while swinging up and down, the shelf member 1 can be pulled out greatly from the storage position, and the shelf member 1 at the lowering completion position On the other hand, the stored items can be easily taken in and out. The stored items can be used safely without falling over, and the shelf storage chamber 61 can be made compact without waste. The user's operation force can be converted into a force for reciprocating the shelf member 1 in the horizontal direction using a link mechanism.

  Further, since the spring member 80 for elastically biasing the parallel link member 2 in the upward swinging direction in the middle of the vertical swing of the parallel link member 2 is provided, the load on the stored items and the shelf member 1 is reduced, and the shelf member 1 can be easily raised. A sudden drop of the shelf member 1 can be prevented and the shelf member 1 can be lowered safely.

DESCRIPTION OF SYMBOLS 1 Shelf member 2 Parallel link member 3 Slide member 5 Rail member 6 Fixed part 7 Connection link member
21 First link member
22 Second link member
22c Stretching part
71 First link member
71a One end
71b The other end
71d middle part
72 Second link member
80 Spring member P4 pivot point

Claims (2)

A pair of left and right rails (5) and (5) fixed to the fixing portion (6) and provided horizontally in the front and rear direction, a slide member (3) that can reciprocate back and forth along the rail (5), and a stored item A parallel link member (2) having a distal end side pivotally attached to the shelf member (1) for placement and a proximal end side pivotally attached to the slide member (3), and the parallel link member (2) are configured. One end (71a) of the extending portion (22c) extending beyond the pivot point (P4) with the slide member (3) in one of the first link member (21) and the second link member (22) Is pivotally attached to the first connecting link member (71) and the other end portion (71b) of the first connecting link member (71) and is pivotally supported by the fixing portion (6). The connecting link member (72), the slide member (3), and the intermediate portion (71d) of the first connecting link member (71) are connected. A connection link member (7) comprises a,
As the parallel link member (2) swings up and down, the slide member (3) is reciprocated back and forth so that the shelf member (1) moves back and forth horizontally while swinging up and down. Lifting shelf to do.   The elevating shelf according to claim 1, further comprising a spring member (80) for resiliently urging the parallel link member (2) in an upward swing direction in a state where the parallel link member (2) is swinging up and down.

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