JP5645498B2 - Underfloor retractable lifting device - Google Patents

Description

  The present invention relates to an elevating device that is mounted on the rear part of a vehicle such as a lorry and that facilitates loading and unloading of cargo by elevating operation of the elevating platform, and in particular, an underfloor retractable structure in which the platform is folded and stored under the vehicle floor. The present invention relates to a lifting device.

  2. Description of the Related Art Conventionally, as a lifting device to be mounted on a truck, it has been common to use a rear gate of a truck as a lifting platform and lift a platform also serving as a rear gate with a link mechanism.

  By the way, in a structure in which the body of a lorry has no gate, for example, a structure having a double door, a slide door, an accordion door, a side-open roof, and the like, the structure in which the lifting platform also serves as the gate of the body is inconvenient.

  Therefore, the lifting device proposed by the present applicant in Patent Document 1 described below has a structure in which the lifting platform is folded, and the platform is stored under the vehicle body floor in a folded state.

Registered Utility Model No. 3092748

  By the way, the lifting platform is installed mainly for lifting the load on the ground to the loading platform floor of the lorry or for dropping the load on the loading platform to the ground. In the case of a warehouse having a fixed platform of a predetermined height, if the height of the warehouse-side platform and the loading platform floor is substantially the same, the elevator platform and the loading platform can be It is possible to efficiently load and unload luggage directly between. However, when the difference in height between the warehouse-side platform and the loading platform floor is large to some extent, efficient cargo handling work using a cart or the like is impossible. At this time, if it is possible to incline the lifting platform in the ascending limit position and function as a transfer plate that connects the warehouse platform and the loading platform floor surface, there is a difference in level between the warehouse platform and the loading platform floor surface. However, efficient cargo handling using carts is considered possible.

  The present invention has been made in view of such a situation, and an object of the present invention is to tilt the elevating platform when the elevating platform is folded and stored under the floor so that the vehicle platform and the height difference between the platform and the vehicle platform are inclined. An object of the present invention is to provide an underfloor retractable lifting device that can function as a transfer plate that communicates between certain structures.

  Other objects and novel features of the present invention will be clarified in embodiments described later.

In order to achieve the above object, an underfloor retractable lifting device according to an aspect of the present invention includes:
A body frame slidable in the front-rear direction with respect to the chassis side of the vehicle;
A slide drive mechanism for pulling the main body frame under the floor of the vehicle;
An elevating platform having a main plate and a tip side plate rotatably connected to the tip side of the main plate by a double hinge;
An elevating drive link mechanism for connecting the main body frame side and the base end side of the main plate to elevate and drive the platform;
The lifting platform is in a folded state when the tip side plate is turned over and overlaps the main plate,
The upper position of the main plate side bracket, which connects the upper position of the distal-side plate side bracket by the double hinge, inclined switching member which can switch the rotational angular position lower portion of the distal-side plate side bracket Attached to the position,
The inclined switching member is in the state in which hits the abutment member fixed to the main plate side bracket at a first angular position, the upper surface of the distal-side plate of the main plate and deployed state becomes flat,
When the inclination switching member is detached from the abutting member at the second angular position, the abutting portion of the distal end side plate can abut on the abutting member, and the distal end side with respect to the upper surface of the main plate The top surface of the plate is inclined and the tip of the tip side plate is lowered.

In the above aspect, further comprising an opening and closing cylinder disposed on the lower surface side of the main plate,
One end of the opening / closing cylinder is attached to the lower surface side of the main plate, one end of the opening / closing link is pivotally connected to the other end of the opening / closing cylinder, and the other end of the opening / closing link is connected to the tip side plate. Pivoted,
When the opening / closing cylinder is extended, the tip side plate may be turned upside down to be in a folded state overlapping the main plate.

  In the above aspect, the shaft switching body is fixed to a shaft body rotatably provided on the tip side plate side bracket, and the shaft body is maintained so that the tilt switching member is detached from the contact member. The rotation position is regulated by a ball click mechanism, and an operation member may be attached to the shaft body.

  In the above aspect, the stopper member may be fixed to the tip side plate side bracket so that the rotation of the inclination switching member is stopped in a state where the inclination switching member is in contact with the contact member.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the underfloor retractable lifting apparatus according to the present invention, when the lifting platform is folded and stored under the floor, the lifting platform is tilted so that the vehicle platform and a structure having a height difference with respect to the platform (for example, a warehouse) It is possible to function as a transfer plate that communicates between the side platforms. As a result, efficient cargo handling using a cart or the like can be performed.

It is embodiment of the underfloor retractable raising / lowering apparatus which concerns on this invention, Comprising: It is a side view which shows the inclination state which lowered | hung the front-end | tip of the raising / lowering platform. It is a side view which shows the horizontal state of a raising / lowering platform. It is a side view which shows the inclination state which raised the front-end | tip of the raising / lowering platform. It is a side view explaining the raising / lowering operation | movement of a raising / lowering platform. It is an elevating platform, (A) is an explanatory diagram when functioning as a transfer plate in an inclined state with the tip of the elevating platform lowered, (B) is functioning as a transfer plate in an inclined state with the end of the elevating platform raised FIG. It is a side view which shows the state before storage by the completion of folding of a raising / lowering platform. It is a side view which shows the storage completion state of an raising / lowering platform. It is a side view which mainly shows a raising / lowering link mechanism part. It is the front end side plate of a raising / lowering platform, Comprising: (A) is a side view, (B) is a bottom view. It is the main plate of a raising / lowering platform, Comprising: (A) is a side view, (B) is the top view which represented the main plate with the virtual line.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  1 to 3 show an elevating platform which is a main configuration of an embodiment of the present invention, and FIGS. 4 to 7 show an entire configuration of an underfloor retractable elevating apparatus using the elevating platform. First, the overall configuration will be described with reference to FIGS. 4 to 7. On the chassis 1 of the lorry, for example, a box-shaped vehicle body (loading platform) 2 is placed and fixed. It is fixed to the rear part of the chassis 1 of the automobile. A rectangular pipe-shaped slide guide 5 with slits is fixed to both sides of the chassis 1 in the horizontal direction on the fixed frame 4. The slits of the square pipe-shaped slide guide 5 are provided for passing a runner 14 described later.

  The main body frame 10 of the underfloor retractable lifting apparatus has a square pipe 11 as a connecting member, brackets 12 and 13 fixed to both sides thereof, and a pair of runners 14 provided inside the brackets on both sides. The lower part of 14 is fixed to the outer periphery of the square pipe 11.

  A runner 14 integrated with the main body frame 10 is provided so as to be slidable in the lateral direction (front-rear direction of the vehicle) with respect to the slide guide 5. That is, a rectangular plate-like sliding member 14a having a wear resistance and a small friction coefficient, such as nylon resin, slidably in contact with the upper and lower inner surfaces of the slide guide 5 is fixed to both ends of the upper portion of the runner 14. Slides smoothly in the slide guide 5 without rattling. The lower portion of the runner 14 extends downward through the slit of the slide guide 5 and is connected to the square pipe 11.

  A slide drive hydraulic cylinder 15 is attached as a slide drive means for moving the runner 14 in the lateral direction (front-rear direction) between the fixed frame 4 side, that is, between the extended end of the slide guide 5 and the runner 14. Yes. That is, when the piston rod of the cylinder 15 is extended, the main body frame 10 (runner 14) approaches the rear end side of the floor 3 of the vehicle body 2 as shown in FIG. The main body frame 10 is in a state of being pulled in the back direction under the vehicle body floor. Although details are omitted, the slide drive hydraulic cylinder 15 may have a double cylinder or two-stage cylinder structure in order to increase the stroke.

  A lifting platform 60 connected to the main body frame 10 via a lifting drive link mechanism includes a main plate 61 and a tip side plate 62 rotatably connected to the tip side. A double hinge (double hinge with two rotation fulcrums) 64 is foldably connected. That is, as shown in FIGS. 1 to 3 and FIGS. 10A and 10B, the main plate 61 has an upper plate portion 61a having a flat upper surface and a reinforcing member 61b fixed to the back side thereof. The bracket 61c is fixed to the tip of the reinforcing member 61b (that is, the tip of the main plate 61). The upper part of the bracket 61c constitutes a part of the double hinge 64, and has a structure in which a small link 65 included in the double hinge 64 is sandwiched from both sides and is pivotally supported by a pin 66 (which serves as one rotation fulcrum). A partition plate 90 is fixed to a lower portion of the bracket 61c, and an abutting member 91 that abuts when an inclination switching member 80 described later is at the first angular position is fixed to the lower side of the partition plate 90. The contact member 91 is provided between the plate members of the bracket 61 c located on both sides of the small connecting link 65. The upper side of the partition plate 90 is an opening or a recess.

  As shown in FIGS. 1 to 3 and FIGS. 9A and 9B, the front end side plate 62 has an upper plate portion 62a having a flat upper surface and a reinforcing member 62b fixed to the back side thereof. The bracket 72 is fixed to the proximal end portion of the reinforcing member 62b (that is, the proximal end position of the distal end side plate 62). The upper portion of the bracket 72 constitutes a part of the double hinge 64, and has a structure in which a small link 65 included in the double hinge 64 is sandwiched from both sides and is pivotally supported by a pin 67 (which serves as the other rotation fulcrum).

  An inclination switching member 80 for switching between a state in which the distal end side plate 62 is leveled with respect to the main plate 61 and an inclined state in which the distal end is lowered is fixed to a shaft body 81 rotatably provided on the bracket 72. Yes. Further, the bracket 72 is a ball that regulates the rotational position of the shaft 81 so as to maintain the second angular position where the inclination switching member 80 is detached from the contact member 91, that is, the upper side of the partition plate 90. A click mechanism 100 is provided. The ball click mechanism 100 is configured such that a compression spring 103 and a ball 104 are accommodated in a cylindrical hole portion 102 of a bottomed case 101, and the ball 104 is urged in a protruding direction by the compression spring 103. A concave portion 81 a into which the ball 104 is fitted is formed at a predetermined position on the outer periphery of the shaft body 81. An operation handle 82 as an operation member is attached to the shaft body 81. In addition, the stopper member 83 is fixed to the bracket 72 so as to stop the rotation of the inclination switching member 80 in a state where the inclination switching member 80 contacts the contact member 91, and a reinforcing member that reinforces the lower portion of the bracket 72. (The stopper member 83 is fixed over the plate members on both sides constituting the bracket 72).

  A lower corner portion of the bracket 72 is an abutting portion 84 that is retracted from the inclination switching member 80. Therefore, when the operation handle 82 is operated and the ball 104 of the ball click mechanism 100 is fitted in the recess 81a of the shaft body 81, that is, when the shaft body 81 is held at the second angular position, the inclination is switched. The member 80 can be detached from the contact member 91 on the main plate 61 side and enter the opening or the concave portion on the upper side of the partition plate 90. For this reason, the abutting portion 84 of the tip side plate 62 can come into contact with the abutting member 91 on the main plate 61 side, and the tip end of the tip side plate 62 is inclined with respect to the main plate 61. It becomes possible. Therefore, the state shown in FIGS. 1 and 5A (functions as a transfer plate for the fixed platform 110 such as a warehouse lower than the floor surface 3A of the vehicle body 2) can be achieved.

  On the other hand, if the operation handle 82 is operated to set the first angular position of the shaft body 81 so that the inclination switching member 80 can be brought into contact with the contact member 91, the main plate as shown in FIG. The upper surfaces of 61 and the tip side plate 62 are flat.

  In order to operate the tilt switching member 80 with the operation handle 82, the opening and closing hydraulic cylinder 70, which will be described later, is used to temporarily close the tip side plate 62 so that the rotation of the tilt switching member 80 is not hindered by the partition plate 90. The tip needs to be lifted.

  As shown in FIGS. 4 to 7, an open / close hydraulic cylinder (double-acting hydraulic cylinder) 70 is disposed on the lower surface side of the main plate 61 in order to automatically open and close the elevating platform 60. That is, the end of the main body of the opening / closing hydraulic cylinder 70 is fixedly attached to the lower surface of the main plate 61 with a fixture (pivotally attached to the lower surface side by the pin 70a), and one end of the opening / closing link 71 is connected to the opening / closing hydraulic cylinder 70. The other end of the opening and closing link 71 is pivotally attached to the lower end of the bracket 72 integral with the proximal end portion of the distal end side plate 62. Here, the pivot points 71 a and 71 b at both ends of the opening and closing link are on a straight line in the axial direction of the opening and closing hydraulic cylinder 70 in the deployed state of the platform 60 (or in the vicinity of the straight line). Therefore, at the initial stage of the platform folding operation in which the opening / closing hydraulic cylinder 70 starts to extend, the distal end side plate 62 with the pin 67 that is the pivot point of the connecting small link 65 of the double hinge 64 to the distal end side plate 62 as a rotation fulcrum. Rotate. Accordingly, the opening / closing link 71 can be prevented from hindering the rotation of the distal end side plate 62. Further, the opening / closing link 71 is curved in an arc shape so as to avoid contact of the main plate 61 and the front side plate 62 with the double hinge 64 on the connection side edge (when the platform is deployed, the opening / closing link 71 is provided). Although not shown, a roller is pivotally attached to the piston rod tip position of the open / close hydraulic cylinder 70 (the pivot point 71a of the open / close link 71). The roller is guided so as to move linearly by a guide rail fixed to the lower surface side of the main plate 61.

  When the opening / closing hydraulic cylinder 70 is extended from the unfolded state of the platform 60, the distal end side plate 62 starts to rotate with the pin 67 as a rotation fulcrum at the beginning. Rotation about the pin 66, which is a pivot point, is also added, and finally, the distal end side plate 62 is turned over so as to be folded over and overlap the main plate 61.

  The operation of the platform 60 from the folded state to the unfolded state can be performed by a reverse operation due to the contraction of the opening / closing hydraulic cylinder 70. At this time, the opening / closing hydraulic cylinder 70 is stopped before the distal end side plate 62 has been unfolded with respect to the main plate 61, so that the distal end of the distal end side plate 62 is lifted with respect to the main plate 61. Can do. Therefore, at the ascending limit position of the platform 60, the state shown in FIGS. 3 and 5B (functions as a transfer plate for the fixed platform 110 such as a warehouse higher than the floor surface 3A of the vehicle body 2) can be achieved.

  As shown in FIG. 8, the upper end portion of the small arm 20 is pivotally attached (rotatably attached) to the bracket 12 of the main body frame 10 by a pin 21, and the lower contact portion 20 a of the small arm 20 faces the square pipe 11 side. The stopper portion 16 is provided in contact with the stopper portion 16. The base end portion of the main arm 25 is pivotally attached to the middle position of the small arm 20 by a pin 26, and the distal end portion is pivotally attached to the base end side upper portion of the main plate 61 by a pin 31. An elevating hydraulic cylinder 27 is pivotally attached by pins 28 and 29 between the lower end of the small arm 20 and a position near the tip of the main arm 25. Further, a sub arm 35 is pivotally connected by pins 36 and 37 between the bracket 13 of the main body frame 10 and the lower part on the base end side of the main plate 61. The main arm 25 and the sub arm 35 constitute a lifting drive link mechanism, and when the lower contact portion 20a of the small arm 20 is in contact with the stopper 16 on the square pipe 11 side, both ends of the main arm 25 are maintained. The pins 26 and 31 and the pins 36 and 37 at both ends of the sub arm 35 are respectively located at the apexes of the parallelogram, and the lift platform 60 in the unfolded state maintains a horizontal state. When the lifting hydraulic cylinder 27 is contracted, the tip of the main arm 25 is lowered (the platform 60 is lowered), and when it is extended, the tip of the main arm 25 is in the raised position (the platform 60 is in the raised position). The rotation of the small arm 20 due to the reaction force when the cylinder 27 is extended is prevented by the lower contact portion 20a contacting the square pipe side stopper 16.

  4, 6, and 7, a buffer roller 38 (an elastic material such as rubber) serving as a receiving member that receives the front end side plate 62 that is turned upside down at an intermediate position of the main arm 25, as illustrated in FIGS. 4, 6, and 7. Is preferable).

  Next, the operation of the embodiment of the underfloor retractable lifting device will be described.

  When carrying out normal cargo handling work, as shown in FIGS. 4A and 4B, the slide drive hydraulic cylinder 15 is extended, and the runner 14 and the main body frame 10 slide close to the floor end of the vehicle body 2. The main plate 61 and the distal end side plate 62 constituting the lifting platform 60 are deployed in a flat plate shape (the tilt switching member 80 is in contact with the abutting member 91, and the deployment operation of the lifting platform 60 is performed). This is done by contracting the open / close hydraulic cylinder 70). Then, by lifting or contracting the lifting hydraulic cylinder 27 that drives the main arm 25 of the lifting drive link mechanism, the main arm 25 and the sub-arm 35 in the parallel link state are rotated, and the platform 60 is shown in FIG. While maintaining the horizontal state from the landing state of the imaginary line (A) to the position of the solid line (B) of the height of the floor surface 3A (the upper surface of the floor 3) of the vehicle body 2, the height of the floor surface 3A The platform 60 can be lowered to the landing state, and by using such a lifting and lowering operation of the platform 60, a cargo handling operation from the ground to the vehicle body floor surface or from the vehicle body floor surface to the ground can be performed.

  When the lifting hydraulic cylinder 27 is further contracted in the landing state of the lifting platform 60, the lower contact portion 20a of the small arm 20 is separated from the stopper 16 on the square pipe 11 side (see FIG. 8), and the main arm 25 Since the mounting fulcrum (pin 26) moves to the rear side of the vehicle body 2, the lifting / lowering platform 60 is tilted as shown by the phantom line (c) in FIG. 4 to load the luggage onto the platform 60 in the landing state. Or it can also be made to carry out efficiently.

  Furthermore, it is possible to make the elevating platform 60 function as a transfer plate that communicates between the floor surface 3A of the vehicle body 2 and the warehouse-side platform 110 as a structure having a height difference. FIG. 5A shows a state in which the tip of the tip side plate 62 is lowered with respect to the main plate 61 that has been raised to the ascending limit position with the inclination switching member 80 as the second angular position deviating from the contact member 91. In FIG. 5B, the opening / closing hydraulic cylinder 70 is stopped just before the distal end side plate 62 is fully deployed with respect to the main plate 61 in the ascent end position (the distal end side plate 62 is moved from the expanded state to the opening / closing hydraulic cylinder 70. In this case, the front end side plate 62 is inclined with respect to the main plate 61.

  The platform retracting operation after normal cargo handling is completed as follows. In the state shown in FIG. 4 (a), that is, in the deployed state of the lifting platform 60, the opening / closing hydraulic cylinder 70 is extended, and the tip side plate 62 is initially rotated with the pin (pivot point) 67 as a rotation fulcrum. Thereafter, rotation about the pin 66 which is a pivot point on the main plate 61 side of the connecting small link 65 is also added, and finally the tip side plate 62 is turned over so as to be overlapped with the main plate 61, and the folded platform is formed. The height of 60 is set to a predetermined height immediately before storage (see FIG. 6).

  When the slide drive hydraulic cylinder 15 is contracted from the state shown in FIG. 6, the lift platform 60 folded as shown in FIG. 7 is drawn under the floor of the vehicle body 2 and stored.

  The operation of unfolding the lifting platform 60 so that cargo handling is possible is the reverse of the storage operation. First, the slide drive hydraulic cylinder 15 is extended to attach the runner 14 and the main body frame 10 to the floor 3 of the vehicle body 2. Then, the hydraulic cylinder 70 for opening and closing is contracted to expand the lift platform 60 in a folded state to form a single flat platform shape. Thereafter, the lifting hydraulic cylinder 27 is contracted or extended to drive the platform 60 up and down via the main arm 25 and the sub arm 35.

  According to this embodiment, the following effects can be obtained.

(1) In the elevating platform 60, an inclination switching member 80 whose rotation angle position can be switched is attached to a lower position of the front plate side bracket 72, and the inclination switching member 80 is fixedly brought into contact with the main plate side bracket 61c. In the state where it hits the member 91, the upper surfaces of the main plate 61 and the tip side plate 62 are flat, and in the state where the inclination switching member 80 is detached from the contact member 91 (the contact portion 84 contacts the contact member 91). The top surface of the tip side plate 62 is inclined with respect to the top surface of the main plate 61 and the tip of the tip side plate 62 is lowered. Therefore, as shown in FIG. 5A, by tilting the tip side plate 62 at the ascending limit position of the lifting platform 60, the floor surface 3A of the vehicle body (loading platform) 2 and a structure having a height difference with respect to this. It is possible to make the elevating platform 60 function as a transfer plate that communicates between (for example, warehouse side platforms). As a result, efficient cargo handling using a cart or the like can be performed.

(2) Stop the opening / closing hydraulic cylinder 70 just before the distal end side plate 62 finishes deploying with respect to the main plate 61 at the ascending limit position (the direction in which the distal end side plate 62 is slightly closed by the opening / closing hydraulic cylinder 70 from the deployed state). To the main plate 61, the tip end of the tip side plate 62 can be brought into an inclined state as shown in FIG. Also in this case, the elevating platform 60 can be made to function as a transfer plate that communicates between the floor surface 3A and a structure with a difference in height (for example, a warehouse side platform). Cargo handling is possible.

(3) An inclination switching member 80 is fixed to a shaft body 81 that is rotatably provided on the bracket 72 on the tip side plate 62 side, and the axis is maintained so that the inclination switching member 80 is detached from the contact member 91. The rotation position of the body 81 is regulated by the ball click mechanism 100. Therefore, by operating the operation handle 82 as an operation member attached to the shaft 81, the switching operation of the tilt switching member 80 can be easily performed. However, the front end side plate 62 needs to be lifted by the open / close hydraulic cylinder 70 so that the rotation of the tilt switching member 80 is not hindered by the partition plate 90.

(4) When the inclination switching member 80 is in contact with the contact member 91, the upper surfaces of the main plate 61 and the tip side plate 62 are flat, but in this state, the inclination switching member 80 is constituted by the partition plate 90 and the stopper member 83. The position is regulated so as to be in contact with the contact member 91. For this reason, there is no possibility that the tip side plate 62 may be inclined and lowered during the cargo handling operation in which the upper surfaces of the main plate 61 and the tip side plate 62 are flat.

  Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.

  In the present embodiment, the folding operation of the platform is automated by the opening and closing hydraulic cylinder, but the present invention can be applied even if the folding operation of the platform is manual.

  Further, the ball click mechanism maintains both the first angular position where the inclination switching member 80 contacts the contact member 91 and the second angular position where the inclination switching member 80 comes off the contact member 91. It is also possible.

DESCRIPTION OF SYMBOLS 1 Chassis 2 Car body 3 Floor part 4 Fixed frame 5 Slide guide 10 Main body frame 11 Square pipe 12, 13, 61c, 72 Bracket 14 Runner 15 Slide drive hydraulic cylinder 16 Stopper 20 Small arm 25 Main arm 27 Lifting hydraulic cylinder 35 Sub arm 60 Lifting platform 61 Main plate 62 Front end plate 64 Double hinge 65 Small link 66, 67 Pin 70 Opening / closing hydraulic cylinder 71 Opening / closing link 80 Inclination switching member 81 Shaft body 82 Operating handle 83 Stopper member 84 Contacting part 90 Partition Plate 91 Contact member 100 Ball click mechanism

Claims (4)

A body frame slidable in the front-rear direction with respect to the chassis side of the vehicle;
A slide drive mechanism for pulling the main body frame under the floor of the vehicle;
An elevating platform having a main plate and a tip side plate rotatably connected to the tip side of the main plate by a double hinge;
An elevating drive link mechanism for connecting the main body frame side and the base end side of the main plate to elevate and drive the platform;
The lifting platform is in a folded state when the tip side plate is turned over and overlaps the main plate,
The upper position of the main plate side bracket, which connects the upper position of the distal-side plate side bracket by the double hinge, inclined switching member which can switch the rotational angular position lower portion of the distal-side plate side bracket Attached to the position,
The inclined switching member is in the state in which hits the abutment member fixed to the main plate side bracket at a first angular position, the upper surface of the distal-side plate of the main plate and deployed state becomes flat,
When the inclination switching member is detached from the abutting member at the second angular position, the abutting portion of the distal end side plate can abut on the abutting member, and the distal end side with respect to the upper surface of the main plate An underfloor retractable lifting device, wherein an upper surface of the plate is inclined and a tip of the tip side plate is lowered. The underfloor retractable lifting apparatus according to claim 1, further comprising an opening / closing cylinder disposed on a lower surface side of the main plate,
One end of the opening / closing cylinder is attached to the lower surface side of the main plate, one end of the opening / closing link is pivotally connected to the other end of the opening / closing cylinder, and the other end of the opening / closing link is connected to the tip side plate. Pivoted,
An underfloor retractable lifting device in which the tip side plate is turned over and overlaps the main plate when the opening / closing cylinder is extended.   3. The underfloor retractable lifting device according to claim 1, wherein the tilt switching member is fixed to a shaft body rotatably provided on the tip side plate side bracket, and the tilt switching member is moved from the contact member. An underfloor retractable lifting device in which a rotation position of the shaft body is regulated by a ball click mechanism so as to maintain a detached state, and an operation member is attached to the shaft body.   The underfloor retractable lifting device according to any one of claims 1 to 3, wherein the stopper member is arranged to stop the rotation of the inclination switching member in a state where the inclination switching member hits the contact member. Underfloor retractable lifting device fixed to side plate side bracket.

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