JP2008222326A - Lift device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lift device of simple structure capable of raising and falling a slope plate and a gangway footplate interlocked with elevation of an elevating plate. <P>SOLUTION: A side plate front projecting part 11 is formed in the elevating plate 2, and the side plate front projecting part 11 of the elevating plate 2 and a side plate rear edge part 32 of a slope plate 8 are turnably pivoted on both sides of the elevating plate 2. A side plate rear projecting part 12 is formed in the elevating plate 2, a support base 10 is provided to support the gangway footplate 9, and the side plate rear projecting part 2 of the elevating plate 2 and a side plate front edge part 42 of the gangway footplate 9 are turnably pivoted on both sides of the elevating plate 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lift device used when a carriage, a wheelchair or the like moves through a step.

  Conventionally, a technique shown in FIG. 8 is known as this type of lift device (see, for example, Patent Document 1). The lift device includes a lift plate 101 on which a wheelchair is placed, an X link mechanism 102 that horizontally supports the lift plate 101, a base 104 that is installed on the lower floor surface 103 and supports the X link mechanism 102, and a lift plate. Driving means 106 is provided for driving 101 with a stroke corresponding to the height difference between the lower floor surface 103 and the upper floor surface 105. A slope plate 107 and a transition plate 108 are supported at the front end portion and the rear end portion of the bottom plate of the elevating plate 101 so that they can be raised and lowered.

According to this lift device, the wheelchair can be carried into or out of the lift plate 101 by laying down the slope plate 107 or the crossover plate 108. When the lift plate 101 is lifted, the slope plate 107 and the crossover plate 108 It is possible to prevent the wheelchair from falling by standing together.
JP-A-7-101687

  However, since the conventional lift device is configured to raise both the slope plate 107 and the transition plate 108 when the lifting plate 101 is lifted, when a carrier such as a carriage or a wheelchair lowers the lifting plate 101, There is a risk that the foot may be caught in the gap between the base 104 and the lifting plate 101.

  Further, in the conventional lift device, in addition to the lifting and lowering operation of the lifting plate 101, it is necessary to raise and lower the slope plate 107 and the crossing plate 108 to prevent the carriage and wheelchair from being carried in and out and dropped. It has been a burden on transporters and users.

  Further, as disclosed in Patent Document 1, the conventional lift device is provided with a raising / lowering mechanism for raising / lowering the slope plate 107 and the transition plate 108 and an interlocking mechanism between the raising / lowering mechanism and the driving means 106. However, after carrying the carriage or wheelchair from the lower floor surface 103 to the slope board 107, before raising the slope board 107, it is necessary to raise the slope board 107 to an inclination capable of locking the carriage or wheelchair, The above problem has not been solved and has a complicated structure.

  The problem to be solved by the present invention is a simple configuration, which can improve the safety when the lifting plate is lowered, can prevent the cart or wheelchair from falling when the lifting plate is lifted, It is intended to provide a lift device that can tilt and move a slope plate and a transition plate in conjunction with the elevation of the plate.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is directed to an elevating plate on which a carriage or a wheelchair is placed, an elevating support mechanism for horizontally supporting the elevating plate, and a lower floor In the lift apparatus, comprising: a base that is installed on a surface and supports the elevating support mechanism horizontally; and a driving unit that drives the elevating plate with a stroke corresponding to a height difference between the lower floor surface and the upper floor surface. The plate has a slope plate made of a plate material with a U-shaped cross section, a side plate with a U-shaped cross-section, and a side plate with a U-shaped cross-section, with the side plate on the lower floor side forward, When the upper floor side is the rear, side plate front protrusions are formed on both front sides of the elevating plate, the side plate front protrusions, and the side plate rear edge of the slope plate inscribed in the side plate front protrusions. The lifting pre At the front end of the bottom plate of the slope plate, the slope plate comes into contact with the lower floor surface by its own weight, is supported by the lower floor surface, and interlocks with the elevation of the lifting plate. The slope plate rises and the rear portion of the slope plate rises in front of the lift plate, and the slope plate collapses in conjunction with the lowering of the lift plate. The bottom plate front end portion and the bottom plate rear end portion of the slope plate that has fallen are configured to engage at the same height.

  According to the first aspect of the present invention, since the slope plate shields the gap between the base and the lifting plate, it is possible to prevent the foot from being pinched and to improve the safety when the lifting plate is lowered. In addition, when the lifting plate is not in the lower limit position, the rear portion of the slope plate is raised, and the rear portion of the raised slope plate acts as a wheel stopper for the carriage, wheelchair, etc. Etc. can be prevented. In addition, the side plate front protrusion of the lift plate and the side plate rear edge of the slope plate are pivotally mounted so that the slope plate is in contact with the lower floor surface. The board can be turned upside down.

  According to a second aspect of the present invention, in the first aspect, the lift device is fixed to a base plate having a U-shaped cross section with a side plate serving as a derailment stop, and the base behind the lift plate. A support base for supporting the transition plate, forming side plate rear protrusions on both rear sides of the elevating plate, the side plate rear protrusion and the side plate front edge of the transition plate inscribed in the side plate rear protrusion Are pivotally mounted on both sides of the elevating plate, and the transition plate contacts the support base by its own weight at the bottom plate of the transition plate, is supported by the support base, and interlocks with the lowering of the elevating plate. The jumper plate stands up, the jumper plate falls in conjunction with the elevation of the lift plate, and the bottom plate rear end portion of the lift plate at the upper limit position of the lift plate and the bottom plate front end portion of the jump plate that has fallen It is characterized by being configured to engage at the same height.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, since the support base shields the gap between the base and the lifting plate, the safety when the lifting plate is lowered can be improved. Further, when the lifting plate is not at the upper limit position, the crossing plate has an inclination capable of locking the cart, the wheelchair, and the like, so that the cart, the wheelchair, etc. can be prevented from falling when the lifting plate is lifted. In addition, the side plate rear projection of the lifting plate and the side plate front edge of the transition plate are pivotally mounted so that the fixed support is brought into contact with the transition plate. The transition board can be turned upside down.

  Furthermore, the invention described in claim 3 is a lifting plate for placing a carriage, a wheelchair or the like, a lifting support mechanism for horizontally supporting the lifting plate, and a lower floor surface, which supports the lifting support mechanism horizontally. In a lift device comprising a base and a driving means for driving the elevating plate with a stroke corresponding to a height difference between the lower floor surface and the upper floor surface, the elevating plate has a side plate serving as a derailment stop, and a cross-section is A cross board made of a U-shaped plate material, a side plate serving as a derailment stop, a cross-sectionally U-shaped plate material, and the lower floor side as the front and the upper floor side as the rear. A support base fixed to the base and supporting the jumper plate, forming side plate rear projecting portions on both rear sides of the elevating plate, the side plate rear projecting portion, and the jumper plate inscribed in the side plate rear projecting portion of A front edge of the plate is pivotally mounted on both sides of the lifting plate, and the transition plate is in contact with the support base by its own weight at the bottom plate of the transition plate and supported by the support base. The transition plate rises in conjunction with the lowering, the transition plate collapses in conjunction with the elevation of the lifting plate, and the bottom plate front end portion of the transition plate that has fallen with the bottom plate rear end of the lifting plate at the upper limit position of the lifting plate Are configured to engage with each other at the same height.

  According to invention of Claim 3, since a support stand shields the clearance gap between a base and a raising / lowering plate, the safety | security at the time of the raising / lowering plate descend | falling can be improved. Further, when the lifting plate is not at the upper limit position, the crossing plate has an inclination that can lock the cart, the wheelchair, and the like, so that the cart, the wheelchair, etc. can be prevented from falling when the lifting plate is lifted. In addition, the side plate rear projection of the lifting plate and the side plate front edge of the transition plate are pivotally mounted so that the fixed support is brought into contact with the transition plate. The transition board can be turned upside down.

  According to the present invention, it is possible to improve the safety when the lifting plate is lowered with a simple configuration, and it is possible to prevent the carriage, the wheelchair, and the like from falling when the lifting plate is lifted. The slope plate and the jumper plate can be tilted in conjunction with

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. The present invention is applied to a lift device 1 configured as shown in FIGS. 1 and 2, for example.

  First, with reference to FIG.1 and FIG.2, the outline of a structure of the lift apparatus 1 is demonstrated. The lift device 1 is installed on an elevating plate 2 on which a carriage, a wheelchair or the like (not shown) is placed, an elevating support mechanism 3 that horizontally supports the elevating plate 2, and a lower floor surface 4. A horizontally supporting base 5, a driving means 7 for driving the elevating plate 2 with a stroke corresponding to a height difference H between the lower floor surface 4 and the upper floor surface 6, and a side plate front projecting portion 11 of the elevating plate 2 The slope plate 8 pivotally mounted on the side plate and the side plate rear protrusion 12 of the elevating plate 2 (the lower floor surface 4 side is the front and the upper floor surface 6 side is the rear. The same applies hereinafter). And a support base 10 that is fixed to the base 5 and supports the transition plate 9 as main parts.

  Next, the configuration of the elevating plate 2 will be described with reference to FIG. The elevating plate 2 is formed of a plate material having a U-shaped cross section, and is horizontally supported by the elevating support mechanism 3 so that the side plate 14 serves as a derailing stop for a cart or a wheelchair (not shown). Yes. And the said raising / lowering plate 2 is formed with the side plate front protrusion part 11 which made the side plate 14 protrude on both front sides. As shown in FIG. 1, the side plate front projecting portion 11 is pivotally attached to the side plate rear edge 32 of the slope plate 8 so as to be rotatable.

  The elevating plate 2 is formed with side plate rearward projecting portions 12 that project side plates 14 on both rear sides. As shown in FIG. 1, the side plate rearward projecting portion 12 is pivotally attached to a side plate front edge portion 42 of the transition plate 9. Further, a guide 16 a for sliding the link 19 of the lifting support mechanism 3 is provided on the rear side of the side plate of the lifting plate 2.

  The lifting plate 2 is provided with a storage plate 17 at a lower end position of the side plate 14 having a function of storing the lifting support mechanism 3. The storage plate 17 takes into consideration the function of protecting the elevating support mechanism 3 from falling objects and the like, and safety so that a carrier or a user does not pinch a hand or the like in the elevating support mechanism 3. A stopper 18 is provided behind the storage plate 17 so that the crossing plate 9 does not fall forward.

  Next, with reference to FIG.1 and FIG.2, the structure of the said raising / lowering support mechanism 3 is demonstrated. The elevating support mechanism 3 is supported horizontally by the base 5, and supports the elevating plate 2 in a horizontal direction and is moved up and down with a stroke corresponding to the height difference H between the lower floor surface 4 and the upper floor surface 6. Mechanism. Therefore, although an example of the X link mechanism is given in the embodiment, another mechanism such as a dogleg link mechanism may be used.

  The elevating support mechanism 3 is configured by connecting a pair of left and right X-shaped links 19 with six joint plates 20. The upper and lower fulcrum shafts 21 of the link 19 are provided at the front part of the side plate of the elevating plate 2, and the upper and lower rollers 22 of the link 19 are the guide 16 a at the rear part of the side plate of the elevating plate 2 and the guide 16 b at the rear part of the side plate of the base 5. Is to be guided by.

  Next, the configuration of the base 5 will be described with reference to FIGS. 1 and 2. The base 5 is installed on the lower floor surface 4 and supports the elevating support mechanism 3 horizontally. The base 5 is formed of a plate material in a square frame shape slightly larger than the elevating plate 2 from the side bar 23 and the flat bar 24 connecting the side bar 23. A guide 16 b for sliding the link 19 of the elevating support mechanism 3 is provided on the rear side of the side plate of the base 5. In addition, a hydraulic cylinder 25 as a driving means 7 is fixed to the outer central portion of the side plate of the base 5, and a support base 10 is fixed to the rear portion of the base 5.

  Next, the configuration of the drive means 7 will be described with reference to FIGS. In the drive means 7, the hydraulic cylinder 25 is fixed vertically outside the side plate of the base 5, and a piston rod 26 is pivotally attached to a blanket 27. The blanket 27 is pivotally mounted by a shaft 28 at the intersection of the pair of X-shaped links 19. Therefore, when the piston rod 26 is extended, the elevating plate 2 is raised, and when it is contracted, it is lowered. The hydraulic cylinder 25 is controlled by a lift switch (not shown) so that the lift operation of the lift plate 2 can be switched.

  Next, the configuration of the slope plate 8 will be described with reference to FIG. The slope plate 8 is formed of a plate material so that the cross section is U-shaped, and the side plate 31 is configured to be a derailment stop for a cart, a wheelchair or the like (not shown). Then, at the rear side edge 32 of the side plate, as shown in FIG. 1, the side plate front protruding portion 11 of the lifting plate 2 is pivotally mounted so that the slope plate 8 is inscribed in the lifting plate 2. Yes. Further, the roller 34 is provided outside the side plate front edge portion 33 so as to roll on the lower floor surface 4.

  The position where the side plate rear edge 32 of the slope plate 8 and the side plate front projecting portion 11 of the elevating plate 2 are pivotally attached, the size of the slope plate 8, and the state of the side plate projecting in the side plate front projecting portion 11 have the following functions. It is determined so that it can be demonstrated. That is, the slope plate 8 contacts the lower floor surface 4 by its own weight at the front end 35 of the bottom plate of the slope plate 8 and is supported by the lower floor surface 4. As shown in FIG. 2, the slope plate 8 rises in conjunction with the elevation of the elevating plate 2, and the rear portion of the slope plate 8 rises. Further, as shown in FIG. 5, the slope plate 8 falls down in conjunction with the lowering of the elevating plate 2, and is substantially level with the bottom plate front end 15 of the elevating plate 2 at the lower limit position of the elevating plate 2. The bottom plate rear end portion 36 of the slope plate 8 that has fallen is engaged at the same height.

  Next, with reference to FIG.2 and FIG.6, the structure of the transition board 9 and the support stand 10 is demonstrated. As shown in FIG. 6, the crossing plate 9 is formed of a plate material so that the cross section is U-shaped, and the side plate 41 is configured to be a wheel stopper for a carriage, a wheelchair or the like (not shown). As shown in FIG. 1, the side plate front edge portion 42 is pivotally attached to the side plate rearward protruding portion 12 of the elevating plate 2 so as to be inscribed in the elevating plate 2.

  As shown in FIG. 2, the support 10 is fixed to the rear portion of the base 5. And the roller 46 is provided in the support stand upper board 47 so that the bottom board 45 of the transition board 9 can be rolled.

  The side plate front edge portion 42 of the crossover plate 9 and the position where the side plate rearward projecting portion 12 of the elevating plate 2 is pivotally attached, the degree of protrusion of the side plate at the side plate rearward projecting portion 12, and the crossover plate 9 and the support base 10 are The contact position and the size of the support base 10 are determined so that the following functions can be exhibited. That is, the transition plate 9 comes into contact with the support base 10 by its own weight on the bottom plate 45 and is supported by the support base 10. As shown in FIG. 5, the bridge plate 9 stands up in conjunction with the lowering of the elevating plate 2. Further, as shown in FIG. 2, the crossover plate 9 lies down in conjunction with the elevation of the elevating plate 2, and lies horizontally with the bottom plate rear end 13 of the elevating plate 2 at the upper limit position of the elevating plate 2. The bottom plate front end portion 43 of the crossover plate 9 is engaged with the same height.

  Next, the operation of the lift device 1 configured as described above will be described with reference to FIG. First, in the lift device 1, when a transporter or a user moves a cart or a wheelchair (not shown) from the lower floor surface 4 to the upper floor surface 6, the transporter or the user moves the lift switch (not shown). Is controlled to lower the elevating plate 2. This is not necessary when the elevating plate 2 is already arranged at the lower limit position.

  As shown in FIG. 7A, the elevating plate 2 is disposed at the lower limit position, and a carriage, a wheelchair or the like (not shown) is placed on the elevating plate 2 via the slope plate 8. When the elevating plate 2 is lowered to the lower limit position, the slope plate 8 and the support base 10 shield the gap between the base 5 and the elevating plate 2, so that the carrier holds his / her foot in the gap. Safety can be improved without fear.

  Further, in the state where the elevating plate 2 is disposed at the lower limit position, the bottom plate front end portion 15 of the elevating plate 2 and the bottom plate rear end portion 36 of the slope plate 8 lying down substantially horizontally are the same height. Therefore, the transporter and the user can easily move the cart, the wheelchair and the like (not shown) to the lift plate 2.

  Next, the transporter or the user controls the lift switch (not shown) to raise the lift plate 2 on which a carriage, a wheelchair or the like (not shown) is mounted. In this case, the elevating plate 2 is raised simultaneously with the switching operation, and the rear portion of the slope plate 8 is raised in conjunction with this, and this raised portion acts as a wheel stopper for a cart, a wheelchair or the like (not shown).

  The crossover plate 9 is in an upright state in a state where the elevating plate 2 is disposed at the lower limit position, and falls over in conjunction with the ascent of the elevating plate 2. And the said board 9 has an inclination until the said raising / lowering plate 2 reaches an upper limit position, and this inclination acts so that a cart, a wheelchair, etc. (illustration omitted) may be latched.

  Therefore, the transporter or the user can raise the elevating plate 2 to the upper limit position of the elevating plate 2 shown in FIG. 7B without dropping a carriage, a wheelchair or the like (not shown).

  Next, as shown in FIG. 7 (B), the elevating plate 2 is disposed at the upper limit position, and a carriage, a wheelchair or the like (not shown) is moved to the upper floor 6 via the bridge plate 9. In the state in which the elevating plate 2 is disposed at the upper limit position, the bottom plate rear end portion 13 of the elevating plate 2 and the bottom plate front end portion 43 of the transition plate 9 lying horizontally are engaged at the same height. Therefore, the transporter and the user can easily move the cart, the wheelchair, and the like (not shown) to the upper floor surface 6.

  In the lift device 1, when the transporter or the user moves a cart or a wheelchair (not shown) from the upper floor surface 6 to the lower floor surface 4, the transporter or the user moves the lift switch (not shown). Is controlled to raise the elevating plate 2. This is not necessary when the elevating plate 2 is already arranged at the upper limit position.

  As shown in FIG. 7B, the elevating plate 2 is disposed at the upper limit position, and a carriage, a wheelchair or the like (not shown) is placed on the elevating plate 2 via the crossing plate 9. When the elevating plate 2 is raised to the upper limit position, the slope plate 8 and the support base 10 shield the gap between the base 5 and the elevating plate 2, so that the carrier holds his / her foot in the gap. Therefore, safety can be improved.

  Further, in the state where the elevating plate 2 is disposed at the upper limit position, the bottom plate rear end portion 13 of the elevating plate 2 and the bottom plate front end portion 43 of the jumper plate 9 lying horizontally are at the same height. Therefore, the transporter and the user can easily move the carriage, the wheelchair and the like (not shown) to the lifting plate 2.

  Next, the transporter or the user controls the lift switch (not shown) to lower the lift plate 2 on which a carriage, a wheelchair or the like (not shown) is placed. The crossover plate 9 is in a horizontally lying state when the elevating plate 2 is disposed at the upper limit position, and stands up in conjunction with the lowering of the elevating plate 2. And the said board 9 has an inclination when the said raising / lowering plate 2 begins to fall, and this inclination acts so that a trolley | bogie, a wheelchair, etc. (illustration omitted) may be latched.

  Further, simultaneously with the switching operation of the lift switch (not shown), the lift plate 2 is lowered, and in conjunction with this, the raised portion of the rear portion of the slope plate 8 falls down. And a protruding part exists until the said raising / lowering plate 2 reaches a lower limit position, and this protruding part acts as a wheel stop of a trolley | bogie, a wheelchair, etc. (illustration omitted).

  Therefore, the transporter or the user can lower the elevating plate 2 to the lower limit position of the elevating plate 2 shown in FIG. 7A without dropping a carriage or a wheelchair (not shown).

  Then, as shown in FIG. 7A, the elevating plate 2 is disposed at the lower limit position, and a carriage, a wheelchair or the like (not shown) is moved to the lower floor surface 4 via the slope plate 8. In the state in which the elevating plate 2 is disposed at the lower limit position, the bottom plate front end portion 15 of the elevating plate 2 and the bottom plate rear end portion 36 of the slope plate 8 lying down almost horizontally are engaged at the same height. Therefore, the transporter and the user can easily move the cart, the wheelchair and the like (not shown) to the lower floor surface 4.

It is a perspective view of the lift apparatus which shows one Embodiment of this invention. It is a side view of the lift apparatus in the upper limit position of a raising / lowering plate. It is a perspective view of a raising / lowering plate. It is a perspective view of a slope board. It is a side view of the lift apparatus in the lower limit position of a raising / lowering plate. It is a perspective view of a transition board. It is a figure with which it uses for description of an effect | action of a wrist apparatus, Comprising: (A) The side view of the lift apparatus in the lower limit position of a raising / lowering plate, (B) The side view of the lift apparatus in the upper limit position of an raising / lowering plate. It is a side view which shows the conventional lift apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Lifting device, 2 Lifting plate, 3 Lifting support mechanism, 4 Lower floor surface, 5 Base, 6 Upper floor surface, 7 Driving means, 8 Slope plate, 9 Crossing plate, 10 Support stand, 11 Side plate front protrusion part, 12 Side plate rear Projection, 13 Bottom plate rear end, 14 Side plate, 15 Bottom plate front end, 32 Side plate rear edge, 35 Bottom plate front end, 36 Bottom plate rear end, 41 Side plate, 42 Side plate front edge, 43 Bottom plate front end, 45 Bottom plate

Claims (3)

Elevating plate for placing a cart, wheelchair, etc., elevating support mechanism for horizontally supporting the elevating plate, a base installed on the lower floor surface, and supporting the elevating support mechanism horizontally, and the elevating plate on the lower floor surface In a lift device comprising a driving means for driving with a stroke corresponding to the height difference from the upper floor surface,
The elevating plate is made of a plate material having a U-shaped cross section, with side plates serving as derailment stops,
The side plate is equipped with a slope plate made of a plate material with a U-shaped cross section, which serves as a derailment stop,
When the lower floor side is the front and the upper floor side is the rear, side plate front projecting portions are formed on both front sides of the elevating plate, and the side plate front projecting portion and the slope plate inscribed in the side plate front projecting portion are formed. The slope plate is pivotally attached to both sides of the lifting plate so that the slope plate is in contact with the lower floor surface by its own weight at the front end of the bottom plate of the slope plate and is supported by the lower floor surface. The slope plate rises in conjunction with the elevation of the elevating plate and the rear portion of the slope plate rises in front of the elevation plate, and the slope plate collapses in conjunction with the lowering of the elevation plate. A lift device characterized in that at the lower limit position of the plate, the bottom plate front end portion of the elevating plate and the bottom plate rear end portion of the sloping slope plate are engaged at the same height. The lift device is
A cross board made of a plate material having a U-shaped cross-section with a side plate serving as a derailment stop,
A support base fixed to the base behind the lifting plate and supporting the transition plate;
Side plate rear projecting portions are formed on both rear sides of the lifting plate, and the side plate rear projecting portions and the side plate front edge portions of the jumper plates inscribed in the side plate rear projecting portions are pivotable on both sides of the lifting plate. At the bottom plate of the transition plate, the transition plate comes into contact with the support base by its own weight, is supported by the support base, and the transition plate rises in conjunction with the lowering of the lift plate, and the lift plate rises. In conjunction with this, the jumper plate is laid down, and at the upper limit position of the lift plate, the bottom plate rear end portion of the lift plate and the bottom plate front end portion of the jump plate that has fallen are engaged at the same height. The lift device according to claim 1. Elevating plate for placing a cart, wheelchair, etc., elevating support mechanism for horizontally supporting the elevating plate, a base installed on the lower floor, and supporting the elevating support mechanism horizontally, and the elevating plate for the lower floor In a lift device comprising a driving means for driving with a stroke corresponding to the height difference from the upper floor surface,
The elevating plate is made of a plate material having a U-shaped cross section, with side plates serving as derailment stops,
A cross board made of a plate material having a U-shaped cross-section with a side plate serving as a derailment stop,
When the lower floor surface side is the front and the upper floor surface side is the rear, it is fixed to the base behind the lifting plate, and includes a support base that supports the bridge plate,
Side plate rear projecting portions are formed on both rear sides of the lifting plate, and the side plate rear projecting portions and the side plate front edge portions of the jumper plates inscribed in the side plate rear projecting portions are pivotable on both sides of the lifting plate. At the bottom plate of the transition plate, the transition plate comes into contact with the support base by its own weight, is supported by the support base, and the transition plate rises in conjunction with the lowering of the lift plate, and the lift plate rises. In conjunction with this, the jumper plate is laid down, and at the upper limit position of the lift plate, the bottom plate rear end portion of the lift plate and the bottom plate front end portion of the jump plate that has fallen are engaged at the same height. And lift device.

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