JP5950524B2 - Underfloor retractable lifting device - Google Patents

Description

  The present invention relates to a lifting device that is mounted on the rear part of a vehicle such as a lorry to facilitate loading and unloading of cargo by lifting and lowering the platform, and in particular, it can be stored under the floor in a structure in which the platform is folded and stored under the vehicle floor. Relates to the device.

  Conventionally, as an elevating device to be mounted on a truck, it has been common to use a rear gate of a truck as a 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 does not have a gate, for example, a structure having a double door, a slide door, an accordion door, a side-open roof, etc., the structure in which the platform also serves as the gate of the body is inconvenient.

  Therefore, in the lifting device disclosed in Patent Document 1 proposed by the present applicant, the platform is configured to be folded, and the platform is folded and stored under the vehicle body floor.

  In addition, in the underfloor retractable lifting device, when the platform is enlarged, the amount of movement in the front-rear direction with respect to the chassis frame of the main body frame to which the platform is attached increases in order to store the folded platform under the vehicle floor. Therefore, it is necessary to devise a slide drive mechanism for moving the main body frame back and forth. For example, in order to increase the stroke with one hydraulic cylinder, it is necessary to make the piston rod thicker from the viewpoint of mechanical strength, and the outer diameter of the hydraulic cylinder also increases. In many cases, it is not possible to secure a space for placing the cylinder. For this reason, in the vehicle provided with the underfloor retractable lifting device of the following Patent Document 2 proposed by the present applicant, a cylinder mechanism in which two hydraulic cylinders are integrated in parallel is adopted.

JP2003-175760 JP2011-121540A

  As shown in FIG. 8, the hydraulic cylinder mechanism of Patent Document 2 is obtained by mechanically integrating two cylinder bodies 81 a and 82 a of two hydraulic cylinders 81 and 82 that are opposite to each other by welding or the like. The piston rod 81b of 81 is extendable with respect to the main body 81a, and the piston rod 82b of the hydraulic cylinder 82 is extendable with respect to the main body 82a.

  As in Patent Document 1 and Patent Document 2, in the underfloor retractable lifting device that stores the platform under the floor of the vehicle body in a folded state, a hydraulic cylinder is used to slide drive the main body frame to which the platform is attached. In general, the piston rod is attached to the mating side by a structure in which the tip of the piston rod and the bracket on the chassis frame are connected by a pin that penetrates both.

  However, when considering actual assembly work, there is a sufficient working space (for example, more than the total length of the pins) on the side of the bracket on the chassis frame side to insert the pin into the tip of the piston rod and the bracket on the chassis frame side. is necessary. Depending on the vehicle on which the underfloor retractable lifting device is mounted, the work space may not be secured.

  In addition, when using a cylinder mechanism in which two hydraulic cylinders are integrated in parallel as in Patent Document 2, if the structure is such that the piston rods on both sides are pivotally attached to the other side by pins, the piston rod is bent. Thus, there is a problem that the postures of the two hydraulic cylinders are not stable.

  The present invention has been made in view of such a situation, and an object of the present invention is to easily, accurately and reliably mount a hydraulic cylinder mechanism for slidingly driving a main body frame to which a lifting platform is mounted with respect to a chassis frame of a vehicle. Another object of the present invention is to provide an underfloor retractable lifting device that can be used in a simple manner and that prevents a change in posture of a hydraulic cylinder mechanism caused by bending of a piston rod.

  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 apparatus according to an aspect of the present invention includes a main body frame that is slidable in the front-rear direction with respect to a chassis frame of a vehicle,
A hydraulic cylinder mechanism for driving the main body frame in the front-rear direction with respect to the chassis frame;
An elevating platform that is foldable and has a flat top surface in the unfolded state;
An extension member extending from the main body frame to the distal end side of the elevating platform and a bracket fixed to the distal end portion of the extension member;
A roller that is rotatably attached to the bracket with a pin, and supports the platform part to be folded from below when the lifting platform is shifted from the expanded state to the folded state,
An elevating drive link mechanism that is attached to the main body frame and that elevates and lowers the elevating platform;
The hydraulic cylinder mechanism includes a first hydraulic cylinder having a first piston rod extending from the first cylinder body to the front of the chassis frame, and a second piston rod extending from the second cylinder body to the rear of the chassis frame. A second hydraulic cylinder is arranged in parallel, and the first and second cylinder body parts are integrated.
A tapered fitting part and a male screw part formed on the leading end side of the tapered fitting part are provided at the tip part of the first piston rod,
The mounting member fixed to the chassis frame side is provided with a tapered recess that fits into the tapered fitting portion, and an attachment hole that penetrates the center of the tapered recess,
In a state where the tapered fitting portion is fitted in the tapered concave portion, the male screw portion is inserted into the mounting hole, and a nut is screwed into the male screw portion, and the tip of the first piston rod A portion is fixed to the mounting member, and a tip of the second piston rod is connected to the bracket by the pin,
When the first and second hydraulic cylinders are contracted and the main body frame is pulled under the floor of the vehicle, the lifting platform in a folded state is stored under the floor of the vehicle.

  In the above aspect, slide guides are respectively fixed to the left and right sides of the chassis frame, and the main body frame includes runners that are slidable with respect to the slide guides, and connecting portions that fix and integrate the runners on both sides. It is good to have. Further, both end portions of the mounting member may be fixed to the slide guide end portions on both sides.

  It should be noted that any combination of the above components is also effective as an aspect of the present invention.

  According to the underfloor retractable lifting apparatus according to the present invention, the mounting operation of the hydraulic cylinder mechanism that slide-drives the main body frame to which the lifting platform is mounted with respect to the chassis frame of the vehicle can be performed easily, accurately, and reliably. Further, it is possible to effectively prevent the posture change of the hydraulic cylinder mechanism due to the bending of the piston rod.

It is embodiment of the underfloor retractable raising / lowering apparatus which concerns on this invention, Comprising: It is a side view in case a raising / lowering platform performs raising / lowering operation in the state which has a main body frame in the rear end side of a chassis frame. In embodiment, it is a side view which shows the state which a main body frame exists in the rear-end side of the chassis frame, and the raising / lowering platform was folded. In embodiment, it is a side view which shows the time of completion of storing of a raising / lowering platform in the state by which the main body frame was drawn in the back | inner direction of the chassis frame. BRIEF DESCRIPTION OF THE DRAWINGS It is a hydraulic cylinder mechanism for a slide drive in embodiment, Comprising: (A) is the top view which made the cross section the part which shows the attachment structure of one piston rod, (B) is the same expanded sectional view. It is a top view of the hydraulic cylinder mechanism for slide drive in an embodiment. It is a front view of the hydraulic cylinder mechanism for slide drive in an embodiment. It is a side view which mainly shows the link mechanism part for raising / lowering in embodiment. FIG. 5 is a perspective view showing a conventional configuration in which two hydraulic cylinders in opposite directions are arranged in parallel, and both piston rods are pivotally attached by pins.

  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 overall configuration of an embodiment of the present invention. In these drawings, for example, a box-shaped vehicle body 2 is mounted and fixed on a chassis frame 1 of a lorry, and a fixed frame 4 of an underfloor retractable lifting device is fixed to a rear portion of the chassis frame 1 of the lorry. ing. A rectangular pipe-shaped slide guide 5 with a slit is fixed to the fixed frame 4 in the front-rear direction on both sides of the chassis frame 1 in the horizontal direction. 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 main square pipe 11 as a connecting portion, 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 the runner 14 is fixed to the outer periphery of the square pipe 11. Further, a sub-square pipe 19 (shown in FIG. 2 and the head 3) as a connecting portion parallel to the main square pipe 11 is fixed between the left and right runners 14. The sub-square pipe 19 is located behind the main square pipe 11 (when the front and rear of the chassis frame 1 are used as a reference).

  As shown in FIGS. 1 to 3, a runner 14 integrated with the main body frame 10 is provided on the slide guide 5 so as to be slidable in the front-rear direction of the chassis frame 1 of the vehicle. That is, a rectangular plate-like sliding member 14a having a wear resistance and a small friction coefficient such as nylon (registered trademark) resin slidably contacting the upper and lower inner surfaces of the slide guide 5 is fixed to both upper ends of the runner 14. 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 pipes 11 and 19 (see FIGS. 2 and 3).

  A slide drive hydraulic cylinder mechanism 15 for moving the runner 14 in the front-rear direction of the chassis frame 1 is attached between the fixed frame 4 side and the main body frame 10 integrally having the runner 14. In addition, a slide drive mechanism that drives the main body frame 10 in the front-rear direction is constituted by the runner 14 that slides in the slide guide 5.

  As shown in FIGS. 5 and 6, the slide drive hydraulic cylinder mechanism 15 includes two hydraulic cylinders arranged in parallel. The cylinder body portions 81 a and 82 a of the two hydraulic cylinders 81 and 82 that are opposite to each other are provided. It is mechanically integrated by welding or the like. The piston rod 81b of the hydraulic cylinder 81 extends from the main body portion 81a to the front of the chassis frame, and the piston rod 82b of the hydraulic cylinder 82 extends from the main body portion 82a to the rear of the chassis frame.

  4A and 4B, a tapered fitting portion 90 having a conical surface is formed at the tip of one piston rod 81b in the hydraulic cylinder mechanism 15 in which the hydraulic cylinders 81 and 82 are integrated. And a male screw portion 91 formed on the tip side. The mounting member 100 that is the mounting partner side of the tip of the piston rod 81b penetrates the tapered recess 101 (having a conical concave surface) that fits into the tapered fitting portion 90 and the center of the tapered recess 101. A mounting hole 102 is provided. The mounting member 100 has, for example, square pipes 106 fixed to both sides of a vertical wall portion of the U-shaped part 105 by welding or the like, L metal fittings 107 are fixed to their tips by welding or the like, and a tapered recess 101 is formed. The block 108 is fixed to the U-shaped part 105 by welding or the like, and is fixed to the front end of the slide guide 5 (when the front and rear of the chassis frame 1 are used as a reference) via the L metal fitting 107. ing. The mounting hole 102 is formed so as to penetrate the block 108 and the U-shaped part 105 in cross section. Then, by screwing the nut 95 into the male thread portion 91 inserted through the mounting hole 102, the tip of the one piston rod 81b is securely fixed in a state where it is accurately positioned with respect to the mounting member 100. Will be.

  The mounting work in this case is simply screwing and tightening the nut 95 to the male threaded portion 91, and the work is simpler than the conventional structure in which the piston rod tip is pivotally attached by a pin, and the surroundings required for the mounting work There is an advantage that less free space is required.

  The other piston rod 82b in the hydraulic cylinder mechanism 15 is connected to the main body frame 10 (that is, a frame portion in which the left and right runners 14 are connected and integrated). Specifically, the tip of the piston rod 82b is pin 96 between the brackets 18 fixed to the extension angle pipe 110 (connected to the intermediate part of the sub-angle pipe 19 by welding or the like) as an extension member. It is connected. In addition, the roller 111 is rotatably supported by the pin 96. The roller 111 supports the platform portion (that is, a distal end side plate 62 described later) that is folded from below when the lifting platform 60 is shifted from the expanded state to the folded state.

  When the piston rods 81b and 82b of the cylinders 81 and 82 are extended, the main body frame 10 (runner 14) approaches the rear end side of the floor portion 3 of the vehicle body 2 as shown in FIGS. In the contracted state, the main body frame 10 moves forward with respect to the chassis frame 1 as shown in FIG.

  As shown in FIGS. 1 to 3, the elevating platform 60 connected to the main body frame 10 via an elevating drive link mechanism is connected to a main plate 61 and a front end rotatably connected to the front end side. It consists of a side plate 62, and both plates are connected by a double hinge (double hinge with two rotation fulcrums) 64 so as to be foldable. That is, one of the small connecting links 65 of the double hinge 64 is connected to the upper part of the tip of the main plate 61 at a pivot point (rotation fulcrum) 66, and the other is connected to the top of the tip side plate 62 at a pivot point (rotation fulcrum) 67. It is connected to the upper part of the base end.

  When the main plate 61 and the tip side plate 62 are flattened, the reinforcing material on the back side of the main plate 61 and the reinforcing material on the back side of the tip side plate 62 (or the end surfaces of both plates 61 and 63) are abutted to each other. Is designed to function as a single flat plate platform. Further, in the folded state, the front end side plate 62 is turned over and overlaid on the main plate 61.

  In order to automatically open and close the lifting platform 60, an opening / closing hydraulic cylinder (double-acting hydraulic cylinder) 70 is disposed on the lower surface side of the main plate 61. 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 / closing link 71 is pivotally attached to a bracket 72 integral with the lower portion of 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 rotates with the pivot point 67 of the small link 65 of the double hinge 64 to the distal end side plate 62 as a rotation fulcrum. To do. 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). It is guided so as to move linearly by a guide rail fixed to the lower surface side of the main plate 61. That is, the piston rod is set to move linearly.

  As shown in FIG. 7, the upper end of the small arm 20 is pivotally attached (rotatably mounted) to the bracket 12 of the main body frame 10 by a pin 21, and the lower abutting 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.

  When the opening / closing hydraulic cylinder 70 is extended from the unfolded state of the platform 60 of FIG. 1, the distal side plate 62 initially starts to rotate around the pivot point 67 as a rotation fulcrum. Rotation about the pivot point 66 on the main plate 61 side is also added, and finally, the distal end side plate 62 is turned over and overlapped with the main plate 61. At this time, the tip side plate 62 is received by the roller 111 and stops.

  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.

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

  A normal cargo handling operation is performed by extending each cylinder of the slide drive hydraulic cylinder mechanism 15 as shown in FIGS. At this time, the tip of one piston rod 81b is securely held by the mounting member 100 without rattling by fitting the tapered surfaces as shown in FIG. 4 (supports the piston rod 81b in the horizontal direction). Since the force is working), it is possible to prevent the posture change (blurring of the posture) of each of the cylinders 81 and 82 due to the bending of the piston rod. In a state where the cylinders 81 and 82 are extended, the runner 14 and the main body frame 10 are slid to a state close to the floor end portion of the vehicle body 2, and the main plate 61 and the tip side plate 62 constituting the lifting platform 60 are flat. (The unfolding operation of the lifting platform 60 is performed by contracting the opening / closing hydraulic cylinder 70). Then, by extending or contracting the lifting hydraulic cylinder 27 that drives the main arm 25 included in 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 moves away from the stopper 16 on the square pipe 11 side (see FIG. 7), 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. 1 to carry the luggage onto the platform 60 in the landing state. Or it can also be made to carry out efficiently.

  The platform retracting operation after normal cargo handling is completed as follows. In the unfolded state of the lifting platform 60 shown in FIG. 1 (a) or (c), the opening / closing hydraulic cylinder 70 is extended, and the tip side plate 62 is initially rotated around the pivot point 67 as a rotation fulcrum, and then connected. The small link 65 is also pivoted about the pivot point 66 on the main plate 61 side, and finally the tip side plate 62 is turned over and overlapped with the main plate 61 (the tip side plate 62 is moved by the roller 111). Supported)).

  In this state, the main arm 25 and the sub-arm 35 are made substantially horizontal as shown in FIG. 2, and the cylinders 81 and 82 of the slide drive hydraulic cylinder mechanism 15 are contracted to move the elevator platform 60 folded as shown in FIG. Is pulled under the floor of the vehicle body 2 and stored. At this time, the tip end of the piston rod 81b is securely held by the mounting member 100 without being rattled by the fitting of the tapered surfaces as shown in FIG. 4 (force for supporting the piston rod 81b in the horizontal direction). Therefore, it is possible to prevent the change in posture (blurring of posture) of each cylinder 81 and 82 caused by the bending of the piston rod.

  The operation of unfolding the lifting platform 60 so that cargo handling is possible is the reverse of the storage operation. First, the cylinders of the slide drive hydraulic cylinder mechanism 15 are extended to move the runner 14 and the main body frame 10 to the vehicle body 2. Then, the open / close hydraulic cylinder 70 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) When the main body frame 10 to which the elevating platform 60 is attached is slid and driven with respect to the chassis frame 1 of the vehicle using the slide drive hydraulic cylinder mechanism 15, the tip of the piston rod 81b is shown in FIG. As shown, it can hold | maintain with the attachment member 100 reliably, without rattling by fitting of taper surfaces. For this reason, unlike the conventional pivoting structure using the pin at the tip of the piston rod, the piston rod 81b is actively supported in the horizontal direction, and the posture change of each cylinder 81, 82 due to the bending of the piston rod ( (Blurring posture) can be prevented.

(2) The piston rod 81b is attached to the attachment member 100 only by screwing and tightening the nut 95 to the male thread portion 91 at the tip of the piston rod 81b penetrating the attachment member 100. Compared to the conventional structure that pivots, the work is simple and the surrounding empty space required for the mounting work is small.

(3) When mounting the piston rod 81b, the surrounding empty space may be small, so the mounting height of the hydraulic cylinders 81 and 82 constituting the hydraulic cylinder mechanism 15 is set as close as possible to the chassis frame 1. Thus, the clearance between the ground and the hydraulic cylinders 81 and 82 can be increased, and as a result, the clearance between each component of the underfloor retractable lifting device and the ground can be increased.

  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. For example, the underfloor retractable lifting device has been exemplified in which the lifting platform has a two-plate structure of the main plate and the tip side plate, but the lifting platform may be foldable with a configuration of three or more. Further, the lifting platform may be manually folded.

DESCRIPTION OF SYMBOLS 1 Chassis 2 Car body 3 Floor part 4 Fixed frame 5 Slide guide 10 Main body frame 11 Main angle pipe 12, 13 Bracket 14 Runner 15 Hydraulic cylinder mechanism for slide drive 16 Stopper part 18 Bracket 19 Sub angle pipe 20 Small arm 25 Main arm 27 Lifting Hydraulic cylinder 35 Sub arm 60 Elevating platform 61 Main plate 62 Front end plate 64 Double hinge 70 Opening / closing hydraulic cylinder 71 Opening / closing link 81, 82 Hydraulic cylinder 81a, 82a Cylinder main body 81b, 82b Piston rod 90 Tapered fitting 91 Male thread portion 95 Nut 100 Mounting member 101 Tapered concave portion 102 Mounting hole

Claims (3)

A body frame slidable in the front-rear direction with respect to the chassis frame of the vehicle;
A hydraulic cylinder mechanism for driving the main body frame in the front-rear direction with respect to the chassis frame;
An elevating platform that is foldable and has a flat top surface in the unfolded state;
An extension member extending from the main body frame to the distal end side of the elevating platform and a bracket fixed to the distal end portion of the extension member;
A roller that is rotatably attached to the bracket with a pin, and supports the platform part to be folded from below when the lifting platform is shifted from the expanded state to the folded state,
An elevating drive link mechanism that is attached to the main body frame and that elevates and lowers the elevating platform;
The hydraulic cylinder mechanism includes a first hydraulic cylinder having a first piston rod extending from the first cylinder body to the front of the chassis frame, and a second piston rod extending from the second cylinder body to the rear of the chassis frame. A second hydraulic cylinder is arranged in parallel, and the first and second cylinder body parts are integrated.
A tapered fitting part and a male screw part formed on the leading end side of the tapered fitting part are provided at the tip part of the first piston rod,
The mounting member fixed to the chassis frame side is provided with a tapered recess that fits into the tapered fitting portion, and an attachment hole that penetrates the center of the tapered recess,
In a state where the tapered fitting portion is fitted in the tapered concave portion, the male screw portion is inserted into the mounting hole, and a nut is screwed into the male screw portion so that the tip of the first piston rod is inserted. A portion is fixed to the mounting member, and a tip of the second piston rod is connected to the bracket by the pin,
An underfloor retractable lifting device in which the lifting platform in a folded state is stored under the floor of the vehicle when the first and second hydraulic cylinders are contracted and the main body frame is retracted under the floor of the vehicle. In the underfloor retractable lifting device of claim 1, slide guides are respectively fixed to the left and right sides of the chassis frame,
The main body frame is an underfloor retractable lifting device having a runner that is slidable with respect to the slide guide and a connecting portion that fixes and integrates the runners on both sides.   The underfloor retractable lifting apparatus according to claim 2, wherein both ends of the mounting member are respectively fixed to the slide guide ends on both sides.

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