KR200317693Y1 - A lifter - Google Patents

Abstract

Disclosed is a lift device which raises and lowers a work bench to a predetermined height while the wires are wound or unrolled according to roll shaft rotation by a predetermined switching operation, and thus the frames connected to the stage are lifted and folded.

The lift device includes a base 100 on which wheels 101 are installed; Opposing fixing frame 110 which is installed perpendicular to the four corners of the base 100; A lifting frame body 120 vertically connected to the multi-stage lifting frame bodies 121, 122, 123, and 124, the width of which gradually decreases as the upper side respectively corresponds to the fixing frame body 110; A guide member 180 having a guide roll 180a; each of the line members 132, 133, 134 starting from the four line members 131 is pulled through the guide members 181, 182, 183, and 184. A line member 130 for transmitting a force to the entire lifting frame body 120; Winding means 140 including a roll shaft 141, a driving means 143, and a gear box 144; And a braking means 142 for moving the plurality of braking plates 142c to the fixed plate 142a on which the electromagnets 142b are formed; and a work table 170 horizontally installed inside the lifting frame body 124.

Description

Lift device {A lifter}

The present invention relates to a lift apparatus, and in particular, to provide a lift apparatus for lifting and folding a plurality of lifting frame bodies which are vertically slidably connected to the horizontal roll shaft by winding four wires of the lower part on which a base is installed and a work table is installed on the upper end. .

Small and medium-sized lift devices, not large ladders, are used for roadside maintenance, electric pole repair, replacement work, high-end camera equipment for broadcasting vehicles, painting outside walls of buildings, cleaning work, ceiling lighting equipment or painting work in large rooms.

Many of these lift devices are known as a movable ladder structure that cannot be adjusted in height, a ladder-type lift device that can be height-adjusted as the X-shaped pedestal is folded by a hydraulic device, and several rectangular frame bodies are continuously vertically assembled to the side thereof. One type of external lift device is known to hang a chain on a roll and lift the central part with a hydraulic cylinder. Among such lift devices, a structure that horizontally connects the frame and the frame through a lifting and lowering pipe connection structure has a horizontal width. There is a problem in that the device is complicated and the number of parts is increased because the separate guide member required for contact sliding must be mobilized by overlapping and slidingly connected at overlapping intervals irrespective of the number. It has a relatively complicated structure to make braking possible while giving strength There were many problems.

Therefore, a simple lifting and lowering structure for lifting and lowering, and a lifting and lowering lifting device equipped with a workbench in a vertical connection structure for lifting and lowering, in which sliding movement of lifting and lowering frames are smoothly required, were required.

The present invention allows the vertical pipe connection structure of the multi-frame body to be moved up and down by sliding through the vertical bars on both sides of the frame body, the width of the frame body gradually decreases upwards to reduce the weight, such a pipe structure It is an object of the present invention to provide a lift apparatus having an improved winding structure of a wire for transmitting a lifting force applied to a multi-stage frame of an engine.

The present invention also aims to provide a lift apparatus having a workbench provided between both frame bodies while achieving the above object.

1 is a perspective view of a folded state of the subject innovation lift device,

Figure 2 is a perspective view of the unfolded state of the present invention the lift device,

Figure 3 is a cross-sectional view of the expanded state of the subject innovation lift device,

Figure 4 is a cross-sectional view of the folded state of the subject innovation device,

5 is an enlarged cross-sectional view of main parts of the frame connection structure of the subject innovation lift device;

6 is an exploded perspective view of a fixture for supporting the end of the line member of the subject innovation lift device,

7 is an expanded state cross-sectional view of another embodiment in which the lowermost line member of the subject innovation lift device is modified to accommodate a heavy load;

8 is a schematic view showing an example of a winding means, a braking means, and a gear box of the subject innovation lift apparatus; and

9 is an enlarged cross-sectional view of the braking means of the subject innovation lift device.

※ Explanation of code for main part of drawing

100: Expectation ............ 101: Wheel 102: Horizontal Bar 103: 1st guide roll 104: 2nd guide roll ..................... 110: Fixed frame 111: Horizontal bar ..... 112: Vertical bar 113: Support bar ..... 120: Lifting frame 120a: Horizontal bar 120b: Vertical bar 120c: Fastening pin retainer ... 120d: Rollers 121, 122, 123, 124: 1, 2, 3, 4 lifting frame 130: Line member 130a: Fastening pin ... 130b: Nuts 131, 132, 133, 134: 1, 2, 3, Four-line member ... 135: Fifth line member 140: Winding means .... 141: Roll shaft 141a: Winding groove. 141b: Contactor 141c: Rotating plate ... 142: Braking means 142a: Fixed plate ... 142b: Electromagnet 142c: Braking plate ... 142d: Sensor 143: Drive means ... 144: Gearbox 150: First support arm ............ 151: Vertical fastening member 152: Fasteners ... 160: Second support arm 161: Vertical fastening members ..... 170: Workbench 171: Floor ... 172: Door 173: Horizontal bar ..... 174: Frame 175: Wall. 176: Emergency exit 180: Guide member ............. 180a: Guide roll 180b: Case ... 181, 182, 183, 184 2, 3, 4 guide member 190: switching means ... 200: contact roll

The object of the present invention is a lift device, which is installed below the device as a rectangular frame, and the base is provided with a wheel capable of rotating the shaft on the bottom of the four corners to be movable; A fixed frame body having a vertical bar placed at four corners of the base and a plurality of horizontal bars horizontally interposed therebetween, and having opposite sides at two sides, and having a support bar between the two sides and the base; The vertical bar is made up of a vertical bar and a horizontal bar corresponding to the fixing frame, and the vertical bar has a connecting jaw portion formed at the inside and the outside thereof so that neighboring frames can be slid vertically through the connecting jaw portion so that the horizontal width is narrowed upward. Lifting frame body consisting of the first, second, third, fourth lifting frame; Four line members in the vertical direction from the take-up roll of the inner side to the first and second guide rolls are bent at four upper ends of the fixed frame body connected to each other and connected to the bottom of the four vertical bars of the first lifting frame body. The frame is a repetitive connection method in which four line members are bent at four places and connected to a lower vertical bar of a neighboring second lifting frame, and the second and third lifting frames and neighboring third and fourth lifting frames are also connected by line members, respectively. A line member for transmitting a predetermined pulling force from the line member to each line member; It consists of a case forming two open spaces, a shaft for horizontally passing through these spaces, and a guide roll installed in one space axis, to guide the first, second, third, and fourth parts to the portions where the line members are bent at the top of the frame. A guide member for installing the members to be rolled as each guide roll and for fixing the front end of each line member to another space; It has four divided winding grooves, and consists of a rotating plate on one side, a roll shaft having a contactor, a driving means installed to give a predetermined driving force to the roll shaft, and a gear box for adjusting the driving force to pull or loosen the line member. Winding means for giving; A fixed plate formed with an electromagnet is formed on the fixed wall of the gearbox with a predetermined detection signal, and a plurality of braking plates horizontally moved by the appearance of the electromagnet are installed to detect abnormal or normal rotation of the roll shaft. Braking means consisting of a contactor as a sensor for detecting; And the footrest is installed on the inner bottom of the four vertical bars of the last lifting frame, the vertical bar forms a wall, the wall is provided with doors, switching means, etc. It is achieved as a lift device comprising a workbench is provided with an emergency exit for emergency desorption. The present invention the lift device is hinged to one end to be horizontally rotatable in terms of the base, the other end is provided with a screw threaded vertical fixing member The first support arm and the first support arm can be pulled out along the hollow part of the base, and a predetermined vertical fixing member is screwed on the tip side thereof. It is preferable to further include a second support arm provided with. The lifting frame body of the present invention lift device is preferably further provided with a contact roll before and after the vertical bar in order to improve the contact force of the vertical sliding. Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 of the accompanying drawings is an overall perspective view before operation of the present invention lift device, Figure 2 is a perspective view of the entire unfolded state after the operation of the present invention, Figure 3 is a cross-sectional view of the expanded state of the present invention lift apparatus, Figure 4 Is a cross-sectional view of a folded state of the subject innovation lift device. The overall configuration of the subject innovation according to the drawings is largely the base 100, the fixed frame body 110 respectively installed on the left and right sides of the base 100, Lines connected between the elevating frame bodies 121, 122, 123, and 124 that are vertically connected to the fixed frame bodies 110, and the fixed frame body 110, the elevating frame body 110, or the elevating frame body 121, or the elevating frame bodies 121, 122, 123, 124. Winding means 140 for winding or releasing the members 131, 132, 133, 134 and the first part 131 of the line members 131, 132, 133, 134. And first and second support arms 150 and 16 for stably holding the stationary state after movement in the side of the base 100. 0), a worktable 170 installed in a bridge shape between the uppermost lifting frame body 120, and a guide member 180 supporting the line members 130 so as to be movable in a curved surface or fixing one end thereof. The base 100 is provided below the apparatus as a substantially rectangular frame. The base 100 is provided with wheels 101 capable of rotating the shaft at the bottom of the four corners so as to be movable. The fixing frame 110 is placed to face both sides of the narrow width of the base 100. The fixed frame body 110 includes a vertical bar 112 placed at four corners of the base 100 and several horizontal bars 111 rolled between them. The fixing frame body 110 formed of the vertical bar 112 and the horizontal bar 111 has a ladder shape that is substantially upright, and is opposed to the opposite sides of the base 100. The fixing frame 110 is inclinedly provided with a support bar 113 for providing the necessary supporting force between the base 100. The lifting frame body 120 has the same structure as the first, second, third, and fourth. The lifting frame bodies 121, 122, 123, and 124 gradually become smaller and gradually smaller in width. The lifting frame body 120 is connected to the movable frame body 110 in a vertically movable manner, and forms a predetermined connection structure. The lifting frame body 120 is installed in a continuous vertical connection structure starting from the fixed frame body 110 and extending to the first, second, third, and fourth lifting frame bodies 121, 122, 123, and 124. These lifting frame bodies 120 are connected in a multistage structure in a pair of symmetrical structures, similarly to the fixing frame body 110, which is opposite to each other. FIG. 5 is an enlarged cross-sectional view of the main portion of the frame connection structure of the lift device of the present invention. The connection structure between the fixed frame body 110 and the lifting frame body 120 will be described with the drawings. The vertical connection structure between the fixed frame body 110 and the lifting frame body 120 or the lifting frame body has a common inner connecting jaw portion (a) formed on the vertical bars 112 and 120b and an outer connecting jaw portion formed on the vertical bar 120b. (b) consists of a predetermined cross-sectional structure interconnected. As shown in FIG. 5, the outer connecting jaw portion b of the first lifting frame body 121 is connected to the inner connecting jaw portion a of the fixing frame body 110, and the inner connecting jaw portion of the first lifting frame body 121 is again connected. The outer connecting jaw portion a of the second lifting frame 122 is connected to (b). In this way, the inner and outer connecting jaw portions (a) and (b) of the lifting frames 121, 122, 123, and 124 are vertically connected. A predetermined contact roll 200 is installed between the fixing frame 110 and the vertical bars 112 and 120b of the lifting frame bodies 120 to improve the contact feeling during the lifting of the vertical bars. The number of the lifting frame body can be extended to suit the height of the lift apparatus. The line member 130 connected between the fixed frame body 110 and the lifting frame body 120 of the above-mentioned fitting structure at each of the upper and lower ends, respectively. 6 is an exploded perspective view of a fastener for supporting the end of the line member of the present invention lift apparatus. In the accompanying drawings, a fastener for fixing the end of the line member 130 of the present invention lift apparatus according to the above drawings. 120c is welded to each of the horizontal bars 120a. The line members 130 are first, second, third, and fourth line members 131, 132, and 133 as will be described later. 6 and 134, and the fixture 120c shown in FIG. 6 is positioned below the lifting frames 121, 122, 123, and 124 to fix the other ends of the line members 130. Specific connection states are as follows. The first line member 131 passes through the guide roll 180a of the guide member 181 installed on the fixing frame 110 through the horizontal guide roll 103 and the vertical guide roll 104 inside the base 100. The second line member 132 is fixed to one end of the upper guide member 181 of the fixing frame 110 after the first lifting frame body 121 is fixed to the lower fixing member 120c of the first lifting frame body 121. The guide roll 180a of the guide member 182 is fixed to the bottom of the neighboring second lifting frame body 122. The third line member 133 is the guide member 182 of the first lifting frame body 121. After fixing one end to the guide member 183 of the second lifting frame body 122 is fixed to the lower end of the third lifting frame body 123. In the same manner, the fourth line member 134 is also fixed to the third lifting frame body 123, and the other end is fixed to the lower end of the fourth lifting frame body 124. That is, the lifting frame bodies 121 ( The line members 131, 132, 133, and 134, which transfer the lifting force of the 122, 123, and 124 ends, are guided by guide members 181, 182, 183, and 184. It is fixed or guided, and the other end is fixed to the lower end of the neighboring lifting frame body (121, 122, 123, 124, respectively). The guide member 180 of such a structure is the upper horizontal bar 111 of the fixing frame body 110 of the line member 131 The first guide member 181 is provided at each of the bent portions, and the second guide member 182 and the third guide member 183 have the same structure on both sides of the horizontal bar 120a of the uppermost level for each lifting frame body 120. Fourth guide members 184 are installed. The guide member 180 is configured as a case (180b) of the structure that can hold the guide roll (180a) as shown in Figure 1, the end of each line member 131, 132, 133, 134 can be fixed When the line member 130 is moved, it is idle. The case 180b has two open spaces and has a horizontal axis for horizontally penetrating the space. A guide roll 180a is positioned on a first space having a horizontal axis, and one end of the line member 130 is fixed in another space. The working table 170 is interposed between the uppermost portions of the last fourth lifting frame 124. That is, the working table 170 is the lower inner side of the four vertical bars 120b of the fourth lifting frame 124. Horizontally installed in the auxiliary, horizontal bar (173) and the frame 174 for the door 172 is installed in the vertical bar (120b). One side of such a work table 170 forms a wall 175 for installing the switching means 190 and the like. In particular, the footrest 171 is provided with an emergency desorption emergency exit 176 in a door type. Figure 7 is an expanded state cross-sectional view of another embodiment in which the lowermost line member of the present invention is changed to a heavy load. Unlike the arrangement of the line member installed in FIG. 3, the elevating operation shown in the drawing further includes a roller 120d at the lower end of the first elevating frame body 121 to guide the upper portion of the fixing frame body 110 from the winding roll 141. Through the member 181, the roller 120d is bent again in the opposite direction to be fixed to the lower end of the second lifting frame 122 via the second guide member 182. Therefore, the lifting operation is a two-stage operation in which the second, third, and fourth lifting frame bodies 122, 123, and 124 first raise and lower, and then the first lifting frame body 121 is raised and lowered. The arrangement is as described above. The lifting and lowering operation of the line member shown in this embodiment is the first lifting frame body 121, the second, third, fourth lifting frame body 122, 123 (when the winding operation of the initial winding roll 141) Only after 124) has risen at the same time has a second principle of operation. Therefore, the above-mentioned lifting frame of the lifting frame body is the lifting operation of all the lifting frame body at the same time, in this embodiment has the difference that the height does not initially rise as much as the first lifting frame body. Figure 8 of the accompanying drawings, the present invention winding means And a schematic view showing an example of a braking means and a gearbox, and FIG. 9 is an enlarged cross-sectional view of the braking means of the present invention. The winding means 140 of the present invention lift apparatus according to the above drawings has approximately four divided winding grooves 141a. A roll shaft 141 having an inner side of the roll shaft 141, a braking means 142 for detecting and braking the abnormally loosened operation when installed on one side of the roll shaft 141, and a driving means for applying a predetermined driving force to the roll shaft 141. 143 and a gear box 144 for controlling the driving force.

The winding means 140 is a roll shaft 141 having approximately four divided winding grooves 141a, and is provided on one side of the roll shaft 141, and braking means 142 for detecting and braking the abnormal loosening operation. And a driving means 143 for applying a predetermined driving force to the roll shaft 141 and a gear box 144 for controlling the driving force.

The roll shaft 141 has a predetermined number of predetermined line winding grooves 141a formed in a spiral shape. One end of the roll shaft 141 is provided with a predetermined braking device through the braking means 142. The braking device may be provided with a variety of known means for preventing the reverse rotation of the roll shaft 141 which is subject to significant reverse rotational power. In the present invention to prevent abnormal rotation of the roll shaft 141 by gear gears. One end of the first line member 131 wound around the roll shaft 141 is connected to the lowermost end of the lifting frame body 120.

In particular, the winding means 140 has a rotary plate 141c fixed to the roll shaft 141 having a plurality of winding grooves 141a and a contactor 141b so as to contact each other with the braking means 142 described later. A predetermined braking operation is performed. The braking means 142 is formed on the wall of the gear box 144 to form a fixed plate (142a) formed with an electromagnet 142b to be shown with a predetermined detection signal and a plurality of horizontal movement by the appearance of the electromagnet 142b By installing the brake plate 142c of the rotary plate 141c to block abnormal rotation. At this time, abnormal rotation of the roll shaft 141 is detected by the sensor 142d in contact with the contactor 141b that flows during the abnormal rotation.

On the other hand, the work of the base 100 described above needs to be fixed to the base 100. In order to fix the base 100, the base 100 is provided with first and second support arms 150 and support arms 160 that are folded or extended in a horizontal direction.

That is, the first support arm 150 is fixed to one end to be horizontally rotatable on the side of the base 100, the other end is formed by screwing the vertical fixing member 151. The second support arm 160 is detachably welded along the other hollow portion of the base 100, and is provided with a predetermined vertical fixing member 161 at the distal end thereof by screwing. Each vertical fixing member 151, 161 is provided with a handle, in particular, the first support arm 150 is provided with a ball fastener 152 to prevent flow when folded to the base 100 . Fastener 152 is a predetermined T-shaped bar is installed horizontally while the spring is wound as known, if the first support arm 150 is folded to the base (100) side hang it as a T-shaped head or head Rotate to release.

Figure 7 is a perspective view of the expanded state of another embodiment of the present invention.

That is, in the present embodiment, the pulley type line member 135 is installed instead of the first and second line members 131 and 132. This is necessary to withstand even a small amount of winding force in heavy load types.

It describes the operation of the present invention made in this way.

Further, the braking means 142 forms a stationary plate 142a on the wall of the inner gearbox 144 that forms an electromagnet 142b to be projected with a predetermined detection signal, and moves as the appearance of the electromagnet 142b. By installing a plurality of brake plates 142c to block abnormal rotation of the rotating plate 141c. At this time, the abnormal rotation of the roll shaft 141 is made of the sensor 142d is installed in the gear box and the contact 141d flowing in the abnormal rotation.

1 and 4 show a perspective view of the folded state of the present invention. In order to prevent the fluidity of the initial base 100, the first and second support arms 150 and 160 are spread out and the vertical fixing members 151 and 161 are sent down to reach the ground.

When the base 100 is stabilized as described above, the operator opens and closes the switching unit 190 by opening and closing the door 172 of the work table 170 and being located on the footrest 171 to raise, lower and stop the work table 170. Adjust the height required for the job.

The pressing operation of the switching means 190 is performed by driving the driving means 143 in accordance with the power supply of a separate power supply means (not shown).

The driving means 143 rotates the roll shaft 141, and when the roll shaft 141 is rotated, four first line members 131 are simultaneously wound in the grooves of the roll shaft 141. The first line member 131 pulls the lower end of the first lifting frame body 121 by the winding operation of the roll shaft 141. The second line member 132 connected to the upper portion of the first elevating frame body 121 by pulling up the first elevating frame body 121 pulls the lower end of the second elevating frame body 123 together. When the second lifting frame body 122 is raised, the third line member 133 connected to the upper part of the second lifting frame body 122 pulls the lower end of the third lifting frame body 123. Subsequently, when the third lifting frame 123 is raised, the fourth line member 134 connected to the upper part of the third lifting frame 123 pulls the lower end of the fourth lifting frame 123. Thus, the work platform 170 is raised to a predetermined position by all of the first, second, third, and fourth lifting frame bodies 121, 122, 123, and 124 simultaneously rising upward.

2, 3 and 7 show the maximum height of the subject innovation. Of course, by adjusting the switching means 190 in the workbench 170 can be adjusted according to the height of the work appropriately.

The lowering operation of the present invention starts as a release signal of the switching means 190. That is, the roll shaft 141 is reversely rotated by the reverse rotation of the driving means 143, and the lifting frame bodies 120 are lowered while the line members 130 which are strongly wound are released.

In the present invention, when stopping by a power failure or a failure, emergency escape is possible by continuing the ascent operation through a known reserve power source, and a detailed description thereof is omitted. In particular, the electromagnet 142b acts as a detection of the sensor 142d for detecting a dangerous abnormal operation such as a sudden reverse rotation of the winding means, pushing and pushing several braking plates 142c installed therein. It is braked by pressing the rotating plate 141c. Although not shown in the present invention, only one side frame fitting structure can be implemented, and in this case, predetermined support bars are provided at an appropriate angle in order to balance the vertically rising lifting frames. Can be installed.

The present invention changed the lifting method of the lift device of the known cylinder type, chain transmission type, and simply the wire type wound through the winding drum. By allowing the elevating structure to be elevated to a predetermined height, a relatively simple lift system has been provided.

Claims (10)

In the lift apparatus, A base 100 installed below the apparatus as a rectangular frame and provided with wheels 101 capable of axial rotation on the bottom of four corners to be movable; It consists of a vertical bar 112 placed in the four corners of the base 100 and several horizontal bars 111 rolled between them, forming a side opposite to the two sides, such two sides and the base (100) Fixing frame body 110 is installed between the support bar 113; The vertical bar 120b and the horizontal bar 120a correspond to the fixing frame 110, and the vertical bars 112 and 120b are adjacent to each other by forming connecting jaw portions (a) and (b) inside and outside. The lifting frame body 120 is formed of first, second, third, and fourth lifting frame bodies 121, 122, 123, and 124, in which the frame bodies are vertically slid through the connecting jaw portions (a) and (b) to make a horizontal connection. ; Four line members 131 in the vertical direction from the take-up roll 141 inside the base 100 to the first and second guide rolls 103 and 104 are bent at four upper ends of the fixed frame body 110 connected thereto. The first lifting frame body 121 is connected to the bottom of four vertical bars, and the first lifting body 121 is connected to the lower vertical bar of the second lifting frame body 122 by bending four line members 132 at the upper four places. In a repetitive connection method, the second and third elevating frame bodies 122 and 123 and the neighboring third and fourth elevating frame bodies 123 and 124 are also connected to the line members 133 and 134, respectively, so that a predetermined pulling force from the line member 131 is increased. Line members 130 to be transmitted to each of the line members (132, 133, 134); It consists of a case 180b constituting two open spaces, an axis through which the spaces are horizontally formed, and a guide roll 180a installed on one space axis, and the line members 131, 132, 133, and 134 are arranged on top of the frames 110, 121, 122, and 123. First, second, third, fourth guide members (181, 182, 183, 184) are installed in the bent portion to be rolled as respective guide rolls 180a, and in other spaces, the tip of each line member 132, 133, 134. Guide member 180 to be fixed; It has four divided winding grooves 141a, a roll shaft 141 having a rotating plate 141c on one side, a contactor 141b, and driving means 143 provided to apply a predetermined driving force to the roll shaft 141. ), Consisting of a gear box 144 for adjusting the driving force winding means for pulling or releasing the line member 131; A plurality of braking plates are provided on a fixed wall of the gear box 144 to form a fixed plate 142a having an electromagnet 142b, which is mounted with a predetermined detection signal, and move horizontally by the appearance of the electromagnet 142b. Braking means (142) consisting of a contactor (141b) as a sensor (142d) for installing the 142c to detect the abnormal rotation or normal rotation state of the roll shaft (141); And The footrest 171 is installed inside the lower ends of the four vertical bars 120b of the last lifting frame 124, and the vertical bars 120b form a wall 175, and the door 172 is provided on the wall 175. , Switching means (190) and the like, the scaffoldings (171), the work platform (170) is installed emergency exit for emergency desorption; delete delete delete The method of claim 1, wherein one end is hinged and fixed so as to be horizontally rotatable in terms of the base, and the other end further includes a first support arm 150 having a vertical fixing member 151 by screwing. Lift device. The method of claim 1, A lift apparatus further comprising a second support arm (160) which is welded along the hollow portion of the base (100) and is provided with a predetermined vertical fixing member (161) by screwing on its front end side. . delete delete The lift apparatus according to claim 1, wherein the lifting frame bodies (121, 122, 123, 124) further comprise contact rolls (200) before and after the vertical bar (120b) to improve the contact force of the vertical sliding. The method of claim 1, A roller 120d is further provided at the lower end of the first lifting frame 121 to be bent again from the winding roll 141 through the guide member 181 at the upper end of the fixing frame 110 in the opposite direction from the roller 120d. After the second guide member 182 is fixed to the lower end of the second lifting frame body 122, the second, third, fourth lifting frame body (122, 123, 124) ascends, descends the first lifting frame body 121, Lift device characterized in that the two-stage operation is made to descend.