JP3170095U - Table lift - Google Patents

Abstract

An object of the present invention is to provide a lightweight and easy-to-handle table lift that can reduce the change in the work position due to the increase or decrease in the number of agricultural products to be mounted, enables loading and unloading work at the same height in the cleaning, drying, and boxing work processes. provide.
A pedestal frame 6 installed on a carriage 50 surrounded by a protective frame, a mounting frame 2 on which a U-shaped carrier 40 abutting on the protective frame is mounted, a mounting frame 2 and a pedestal frame 6, one end is locked, and the other end includes sliding rollers 11 and 12 locked to the mounting frame 2 and the sliding guides 13 and 14 of the pedestal frame 6, and is opposed to each other in a pair structure. The outer arm 4 and the inner arm 3 intersecting with the X shape, and one end locked to the base frame 6 and the other end fixed to either the outer arm 4 or the inner arm 3 intersecting the X shape A table lift comprising an elastic drive unit 20 locked to an arm 22.
[Selection] Figure 1

Description

  The present invention relates to a lifting device installed on a carriage, and relates to a table lift that can adjust the height of the loading platform by balancing the weight of the object placed on the loading platform with the tension of the elastic material.

  When harvesting, washing, drying, and boxing agricultural products, it is common to work by placing multiple stages of agricultural products on a work cart surrounded by a protective frame on three sides with wheels. However, in the work process performed at a fixed position such as washing, drying, and boxing, the work position changes according to the increase or decrease of the amount of agricultural products placed in multiple stages, so there is a problem that burdens on the waist and arms for the operator . For this reason, work carts to place harvested agricultural products are loaded at the same height by adjusting the height of the loading platform according to changes in the working position where the agricultural products are loaded and unloaded by washing, drying and boxing operations. There is a need for a table lift that enables work.

  For example, in the table lift devised by the present applicant shown in Patent Document 1, it is inserted under the carriage 50 as shown in FIG. 5, and the crossed outer arm 104 and inner arm 105 are opposed to each other in a pair structure and connected. A mounting frame 102 on which a carriage 50 is mounted is driven by rotating the screw shaft 121 of a driving screw-type jack 120 called a pantah jack in which a link member is connected to a commercially available rhombus-shaped link member with an electric drill 110. A lightweight table lift 100 that moves up and down from a pedestal frame 103 is disclosed.

Registered Utility Model No. 3164596

  However, in the case of a conventional table lift that moves up and down with a screw jack for driving with a carriage, to change the height, the screw shaft of the screw jack for driving is rotated manually or using an electric drill, The work had to be interrupted.

  Further, since the conventional table lift is installed under the carriage, there is a problem that it takes time to mount and remove the table lift when the carriage is moved.

  In addition, it has been desired to provide a table lift that can be automatically changed in height in accordance with a change in the weight of agricultural products or the like placed on a cargo bed with a structure installed on a carriage.

  The present invention has been made with respect to the above-described problems, and is a table lift installed on a conventional carriage, where the harvested agricultural products are placed on the loading platform of the table lift, the weight of the agricultural products placed, and the table Provides a table lift that enables the work at the same height by passively adjusting the height of the loading platform according to changes in the weight of the produce by balancing the tension of the elastic material attached to the lift. For the purpose.

  In order to achieve the above object, the present invention has the following configurations (1) to (4).

  (1) A pedestal frame installed on a carriage surrounded by a protective frame, a U-shaped carrier that contacts the protective frame, a placement frame for placing the carrier, the mounting frame, and the pedestal One end of the frame is rotatably engaged with the frame, and the other end is provided with a sliding roller that is locked to a slide guide fixed to the mounting frame and the pedestal frame and is movable in the horizontal direction. An outer arm and an inner arm that intersect with each other in an X shape and are opposed to each other in a pair structure, and either the outer arm or the inner arm that has one end locked to the pedestal frame and the other end intersects the X shape A table lift comprising: an elastic drive unit which is locked to a drive arm fixed to the table.

  (2) A pedestal frame installed on a carriage surrounded by a protective frame, a U-shaped carrier that contacts the protective frame, a placement frame for placing the carrier, the mounting frame, and the pedestal One end of the frame is rotatably engaged with the frame, and the other end is provided with a sliding roller that is locked to a slide guide fixed to the mounting frame and the pedestal frame and is movable in the horizontal direction. An outer arm and an inner arm that intersect with each other in an X shape that are opposed to each other in a pair structure, and a fixed pulley that is locked to the pedestal frame and fixed to either the outer arm or the inner arm. A table lift characterized in that a movable pulley is locked to an elastic drive portion to be locked, and a combined pulley is connected between the pedestal frame and the drive arm.

  (3) The elastic driving unit connects the fixing member fixed to the pedestal frame, the driving arm fixed to either the outer arm or the inner arm, and the fixing member and the driving arm. A plurality of power units, and the plurality of power units are configured to individually pull the elastic materials corresponding to the weights of the plurality of annular elastic materials and the object to be placed on the loading platform. The table lift according to (1) or (2), characterized in that the table lift includes a plurality of traction arms different from each other.

  (4) The U-shaped loading platform has a horizontally disposed loading receiving portion and loading frames arranged vertically at both ends of the loading receiving portion, and further, the opposite ends of the loading receiving portion are opposed to the carriage. The table lift according to (1) or (2), further comprising a guide roller that assists the vertical movement of the loading platform by contacting the protective frame.

  According to the present invention, it is a table lift installed on a working carriage, and is loaded as the amount of agricultural products increases or decreases in the work process in which agricultural products are packed in the loading platform, washed, dried and boxed. By balancing the weight of the produce and the tension of the elastic material of the elastic drive part attached to the table lift, the height of the loading platform can be raised and lowered passively according to the change in the weight of the placed produce. It is possible to provide a table lift that does not require special driving power.

(A) A perspective view of a table lift according to the present embodiment installed on a conventional carriage, (b) a perspective view of the table lift excluding the loading platform, and (c) a configuration diagram of a power unit of an elastic drive unit. (A) The bottom view which shows the structure of the elastic drive part of a table lift, (b) The front view of the table lift except a loading platform, (c) The front view at the time of lowering the table lift with the mounting weight W The figure which shows the operation of the elastic drive part when lowering the table lift in four steps (A) The figure which shows operation | movement of the loading platform of the table lift which concerns on a present Example, (b) Structure figure of the guide roller of a loading platform A perspective view showing a conventional table lift

  Hereinafter, the form for implementing this invention is demonstrated in detail by an Example.

  The structure and function of the table lift 1 according to this embodiment shown in FIG. 1 will be described.

  It should be noted that the elastic drive unit 20 of the table lift can be attached to either the intersecting inner arm 3 or outer arm 4, and in the drawings and description of this embodiment, the elastic drive unit 20 attached to the inner arms 3a and 3b. The structure will be described. In addition, the elastic drive unit 20 can be attached to any position of the inner arm 3 or the outer arm 4, and in this embodiment, the structure is described in which the inner arm 3 is attached to the sliding roller 12 side.

  As shown in FIG. 1 (a), the table lift 1 is an elevating device that is provided with wheels 55 and is installed on a working carriage 50 surrounded by protective frames 52, 53, and 54 on three sides. The structure consists of a mounting frame 2 and a pedestal frame 6 in which square members are joined in a square shape, a pair of opposing inner arms 3 and outers arranged in a pair structure that allows the mounting frame 2 to be moved up and down from the pedestal frame 6. The arm 4, the elastic drive unit 20 attached to the inner arms 3 a and 3 b, and the detachable square material for placing agricultural products such as radishes and squash placed on the placement frame 2 are arranged in parallel. It is comprised from the U-shaped loading platform 40 joined.

  The loading platform 40 mounted on the mounting frame 2 mounts agricultural products or the like provided with guide rollers 42 and 43 for contacting the left and right protection frames 52 and 53 of the working carriage 50 and using them as guides. A rectangular load receiving part 41 in which a plurality of square bars are arranged and connected in parallel, and load frames 44 and 45 formed by connecting a plurality of square bars to both ends in the longitudinal direction of the load receiving part 41 are arranged. It is a U-shaped frame structure loading platform that is detachably mounted.

  From the table lift 1 excluding the loading platform 40 shown in FIG. 1B, the mounting frame 2 is configured by connecting four frames 2a, 2b, 2c, and 2d in a square shape, and the pedestal frame 6 is also a mounting frame. 4, four frames 6a, 6b, 6c, and 6d having the same shape as those of FIG. The frames 2a and 2b and the frames 6a and 6b arranged to face each other may have a structure in which the reinforcing members 2e and 2f and the reinforcing members 6e and 6f are passed as necessary to increase the rigidity. The paired structure of the inner arm 3a and outer arm 4a intersecting the X shape of the table lift 1 and the inner arm 3b and outer arm 4b is opposed to each other with the center portion where each arm intersects being rotatably locked by the fulcrum shaft 5. Has been placed.

  The pair of inner arms 3a and 3b has one end rotatably fixed to the mounting frame 2 by a shaft 7, and the other end is a U-shaped sliding guide 14 attached to the pedestal frame 6. The sliding rollers 12a and 12b, which are fitted in the sliding guides 14 and can move horizontally along the sliding guides 14a and 14b, are rotatably locked to the shaft 10. Similarly, the pair of outer arms 4a and 4b has one end rotatably fixed to the pedestal frame 6 by a shaft 8, and the other end is a U-shaped sliding guide attached to the mounting frame 2. 13, sliding rollers 11a and 11b that are horizontally movable along the sliding guides 13a and 13b are rotatably locked to the shaft 9.

  The elastic drive unit 20 includes four traction arms 23a, 23b, 23c, and 23d that are rotatably locked to the drive shaft 24 at the tip of the drive arms 22a and 22b fixed to the inner arms 3a and 3b. A power unit having a structure in which four driving rubbers 30 that are elastic materials are locked is attached to a pulling shaft 25 at each tip of the pulling arm 23. The elastic drive unit 20 can operate in the same manner regardless of whether it is attached to the inner arm 3 or the outer arm 4 and is changed depending on the specification. Therefore, the attachment structure does not limit the present invention.

  FIG. 1C shows the configuration of the power unit, which includes a traction arm 23 and a drive rubber 30 locked to a traction shaft 25 formed at the end of the traction arm 23, and the other end of the drive rubber 30. Is fixed to the fixed shaft 27 of the base frame 6. Two sets of power units are mounted on the elastic drive unit 20 of the table lift 1 of the present invention shown in FIG. 2, and the four pulling arms 23a, 23b, 23c, and 23d having different lengths are respectively provided with a drive rubber 30a, 30b, 30c, and 30d are attached.

  The structural material used for the table lift 1 is made by combining high-rigidity square materials such as wooden frames such as compression materials, aluminum frames for metals, and stainless steel frames with excellent water resistance, depending on the customer's application. Since it can do, it does not specifically limit.

<Structure and function of elastic drive>
The structure and function of the elastic drive unit 20 will be described with reference to FIG. From the bottom view of the table lift 1 shown in FIG. 2A, the elastic drive unit 20 is rotatably engaged with a drive shaft 24 that connects the tips of the drive arms 22a and 22b fixed to the inner arms 3a and 3b. Four sets of four pulling arms 23a, 23b, 23c, and 23d stopped and driving rubbers 30a, 30b, 30c, and 30d locked to the pulling shafts 25a, 25b, 25c, and 25d of the pulling arm 23. A power unit is attached and each power unit is pulled in steps.

  The driving rubber 30 uses a commercially available annular rubber or a rubber band whose tension can be easily changed by winding it in an annular shape. is there. The description of the elastic material in the present embodiment will be made with the driving rubber 30 made of an annular rubber having the same length or a rubber band wound in an annular shape.

  The other ends of the drive rubbers 30a, 30b, 30c, and 30d attached to the four pulling arms 23a, 23b, 23c, and 23d having different lengths shown in FIG. 2 (b) are fixed to the pedestal frame 6. The fixing member 26 is locked through a fixed shaft 27. The structure of the four sets of power units in which the traction arm 23 and the drive rubber 30 are connected by the traction shaft 25 serves to passively operate the elastic drive unit 20 in accordance with the weight of the agricultural product to be placed. That is, the elastic drive unit 20 is an elastic material that is pulled by the four pulling arms 23a, 23b, 23c, and 23d that are locked to the tips of the driving arms 22a and 22b fixed to the opposing inner arms 3a and 3b. By extending the four drive rubbers 30a, 30b, 30c, and 30d, the inner arms 3a and 3b are passively driven up and down by the third-class lever principle.

  The four sets of power units of the elastic drive unit 20 have a configuration corresponding to a state in which agricultural products such as radishes placed on the loading platform 10 are placed in four stages, and the weight of the first stage is set to the driving rubber 30a. The second stage weight is based on the structure of the driving rubber 30b, the third stage weight is mainly driven by the driving rubber 30c, and the fourth stage weight is mainly handled by the driving rubber 30d.

  The elastic drive unit 20 of the present embodiment shown in FIG. 2 (c) has the inner arm 3 and the outer arm 4 that are crossed in the X shape opened to the maximum when the agricultural products placed on the loading platform 10 are placed in four stages. In the state, that is, in the state where the table lift 1 is at the lowest position, the traction force relating to the drive rubbers 30a, 30b, 30c, 30d of the four sets of power units is maximized.

  When a large amount of heavy agricultural products such as radish, nanban and watermelon are placed, if the tension T of the driving rubber 30 is weak, the driving rubber 30a, 30b, 30c, four driving rubbers 30a, 30b, 30c 30d is still stretched and cannot be shrunk. Further, when the elongation of the drive rubber 30 exceeds the elastic limit, there arises a problem that the drive rubber 30 remains stretched and does not shrink to the original state. Therefore, when the driving rubber 30d responsible for the weight of the fourth stage is extended, the length of the pulling arm 23 and the driving rubber 30a are adjusted so that the elongation of the driving rubber 30a responsible for the weight of the first stage does not exceed the elastic limit. It is necessary to select the width.

  However, if the driving rubber 30 does not exceed the elastic limit and the weight of the placing object does not decrease to the extent that the weight of the placing object does not decrease, the placing portion 2 of the table lift 1 will not rise, and conversely, the stretched state can be maintained. A mechanism for raising the height of the loading platform 10 in stages can be constructed. That is, when the tension T of the four drive rubbers 30a, 30b, 30c, and 30d is selected to an optimum value, the amount of agricultural products placed in the boxing work process is reduced and the placement weight W is changed. When the loading weight for one stage that balances with the tension T of the corresponding drive rubber 30 is reduced, the height of the loading platform 10 is increased by the reduced one stage of the farmed product to keep the working position constant. The unique function of the present invention, which allows the function to be demonstrated, can be realized. This is a characteristic of the pulled rubber, which utilizes the phenomenon that when the stretched length exceeds a certain length, the rubber cross section becomes smaller and the tension T of the rubber suddenly decreases and stretches easily. If the elastic limit is not exceeded, the rubber shrinks and returns to its original state.

For example, in the case of the table lift 1 on which 100 kg of agricultural products are placed, each of the four driving rubbers 30a, 30b, 30c, 30d of the elastic drive unit 20 has a power of 25 kg corresponding to the loading weight of one stage. When the lengths of the four pulling arms 23a, 23b, 23c, and 23d constituting the unit were set to 335 mm, 295 mm, 245 mm, and 185 mm, the thickness was 0.8 to 30 mm and the width was 30 to 80 mm. The drive rubber 30 is required to have a tensile strength of 100 kgf / cm ² or more and an elongation of 200% or more. When the driving rubber 30 is selected, it is necessary to select the optimum tension T of the driving rubber 30 in consideration of the maximum weight of the agricultural product to be placed. Normally, the tension of rubber increases in proportion to the length of extension, but similarly, the width increases at the same rate, so it is determined that the “tension per width” is constant.

  The commercially available annular rubber or rubber band is selected from standardized products, and when a string-like rubber band is used, the tension T can be easily adjusted by increasing or decreasing the number of times of wrapping the ring. Further, when increasing the number of stacked farm products to be placed, it is possible to increase the power unit composed of the pulling arm 23 of the elastic drive unit 20 and the drive rubber 30 or increase the maximum tension T of the drive rubber 30 to increase the number of stages. A method may be used in which the steps are handled by a single drive rubber 30.

  The elastic material used in the elastic drive unit 20 described above may be a spring material in addition to a rubber band or an annular rubber, and does not limit the type of elastic material.

<Up-and-down movement of table lift>
FIG. 3 is a schematic view showing the operation of the table lift 1, and the four-step lifting operation of the table lift 1 passively driven by the four sets of power units of the elastic drive unit 20 fixed to the inner arm 3 will be described. .

  As described above, the four drive rubbers 30a, 30b, 30c, and 30d of the elastic drive unit 20 have a configuration corresponding to a state in which the agricultural products placed on the loading platform 40 are overlapped in four stages, and the weight of the first first stage. W1 is the tension T1 of the driving rubber 30a, the second weight W2 is the tension T2 of the driving rubber 30b, the third weight W3 is the tension T3 of the driving rubber 30c, and the fourth weight W4 is the tension T4 of the driving rubber 30d. The structure that each takes charge of is the basis.

  The actual four sets of power units of the elastic drive unit 20 have a weight W1 of the first stage in consideration of the fact that when the extended length exceeds a certain length, the rubber cross-section becomes smaller and the rubber tension decreases. When the first-stage driving rubber 30a extended to the second stage is further extended by the weight W2 of the second stage, the combined tension T1 + T2 of the reduced tension T1 and the tension T2 of the second-stage driving rubber 30b extending next is placed. The tension T2 of the drive rubber 30b is selected so that it can be well balanced with the agricultural product W1 + W2, and the tensions T3 and T4 of the drive rubbers 30c and 30d in the other stages are the same.

  The sliding motion of the pair of inner arms 3 that enables the mounting frame 2 to be moved up and down passively from the pedestal frame 6 in the vertical direction is a drive arm 22 fixed to the inner arm 3 at a right angle by the incorporated elastic drive unit 20. The four working rubbers 30a, 30b, 30c, and 30d, which are rotatably locked to the driving shaft 24, have the same working position with respect to agricultural products placed on the loading platform 40 by the tensions T1, T2, T3, and T4. There are four stages of position changes to ensure. A load of pulling back the inner arm 3 by the tension T of the driving rubber 30 of the elastic driving unit 20 as the weight of the mounted agricultural product decreases in the washing, drying, and boxing work processes by loading the agricultural product into the loading platform 40; The mounting frame 2 is automatically raised to a height at which the weight W of the mounted agricultural product is balanced. On the other hand, since the tension T of the elastic drive unit 20 is also reduced when any one of the drive rubbers 30 is contracted, the load W of the reduced agricultural products and the inner arm 3 due to the tension T of the remaining drive rubber 30 are reduced. The raising of the mounting frame 2 is stopped at a position where the pull back force is balanced.

  For example, in a configuration corresponding to a state where daikon radish having a total weight of 100 kg is placed on the loading platform 10 in a four-tiered manner, the weight of the lowest radish of 25 kg is the driving rubber 30a, and the weight of the second radish is 25 kg. The driving rubber 30b has a structure in which the driving rubber 30c has a weight of 25 kg of the third radish and the driving rubber 30d has a weight of 25 kg of the fourth radish. When all 25 kg of the uppermost fourth daikon radish is removed, the load 40 is raised by about one radish at the tension T4 of the drive rubber 30d, and the work position relative to the third radish is not changed. ing. Similarly, when 25 kg of the third radish is all removed, the loading platform rises by about one radish at the tension T3 of the drive rubber 30c, and when the 25kg of the second radish is removed, the tension of the drive rubber 30b. When the loading platform 10 is lifted by T2 and 25 kg of the last radish is removed, the mechanism returns to the original height by the tension T1 of the drive rubber 30a.

<Structure of loading platform>
FIG. 4A is a diagram illustrating a configuration of the loading platform 40 placed on the placement frame 2. A load receiving portion for placing agricultural products or the like having guide rollers 42 and 43 structured so as to abut on the four cylindrical pipe members of the left and right protective frames 52 and 53 of the conventional carriage 50 and used for a vertical guide. 41 and a loading platform 40 having a U-shaped frame structure composed of loading frames 44 and 45 arranged on the left and right sides are detachably mounted. The load receiving portion 41 of the loading platform 40 is detachably mounted by a plurality of loading platform fixtures 46 that are structured to be fitted and fixed to the frames 2 c and 2 d of the mounting frame 2 of the table lift 1.

  As shown in FIG. 4 (b), a bobbin-shaped guide roller 42 that comes into contact with the cylindrical pipe member 52 a of the protective frame 52 in the longitudinal direction of the carriage 50 is attached to the end of the square member 41 a constituting the load receiving portion 41. The shaft 46a is rotatably locked. When the table lift 1 moves up and down, it moves up and down using the cylindrical pipe members of the protective frames 52 and 53 attached to each side of the carriage 50 by connecting the four cylindrical pipe members as guides. Assists the smooth movement of the loading platform 40 on which is placed. The guide rollers 42 and 43 in contact with the respective protective frames 52 and 53 restrict the operation of the loading platform 40 only in the vertical direction with respect to the cylindrical pipe material of the protective frames 52 and 53 by the bobbin-like shape, and produce agricultural products. When placing, the loading platform 40 is prevented from tilting laterally.

  The load frames 44 and 45 attached to both ends of the load receiving portion 41 exhibit an effect of preventing load collapse when the agricultural products are stacked, and the mounting method of the load frames 44 and 45 is a folding structure or a detachable structure. Also good.

  As another configuration example of the elastic drive unit 20 of the table lift 1, a configuration of a power unit in which a combination pulley is connected to the drive arm 22 will be described.

  The distance at which the power unit is pulled when the drive arm 22 is fixed on the inner arm 3 or the outer arm 4 on the sliding rollers 11 and 12 side and on the frame side shafts 7 and 8 side. There was a different problem. In particular, when it is attached to the shafts 7 and 8 on the frame side, the traction interval is shortened, so that the performance of the drive rubber 30 constituting the power unit may not be sufficiently exhibited.

  Since the performance of the drive rubber 30 is exhibited by being stretched by a predetermined length or more, the stretched distance of the drive rubber 30 is doubled, tripled, etc. by using a structure in which a combination pulley is connected. Can be secured. Further, there is an advantage that the tension T of the drive rubber 30 can be reduced to 1/2, 1/3, etc. by connecting the combination pulley.

  The combined pulley is a structure in which a moving pulley and a fixed pulley are combined. The value obtained by dividing the weight W by the number of the moving pulley and the fixed pulley to be combined is a force required for traction. Although T can be reduced, the towing distance is a value obtained by multiplying the number of the moving pulleys and the fixed pulleys, and the towing interval becomes long, and the interval necessary for extracting the characteristics of the towing rubber 30 in the present invention can be secured.

  Explaining using the operation diagram of the elastic drive unit 20 in FIG. 3, one end of the pulling cable of the combined pulley is fixed to the fixing member 26, and the pulling cable is locked to the fixed shaft 27 of the base frame 6. The other end of the traction cable is fixed to the drive arm 22 via a fixed pulley attached to the fixed shaft 27 via a moving pulley attached to the end of the drive rubber 30 of the power unit. When the agricultural product is placed, the placing frame 2 is pushed down by its weight W, so that the driving arm 22 pulls the towing cable, and the driving rubber 30 of the power unit is pulled by the combined pulley by the force of W / 2. It becomes the composition to be done. Since the configuration other than the combined pulley mounting structure is the same as that of the first embodiment, the description thereof is omitted.

  As described above, the table lift according to the present invention is mounted by balancing the weight of the agricultural product placed and the tension of the elastic material attached to the table lift so that the work position can always be loaded and unloaded at the same height. The height of the loading platform can be arbitrarily raised and lowered in accordance with the change in the weight of the agricultural product placed, and a table lift that does not require a special driving mechanism can be provided.

1 Table lift 2 Mounting frame 3 Inner arm (corresponding to arm)
4 Outer arm (corresponding to arm)
5 fulcrum shaft 6 pedestal frame 7 shaft 8 shaft 9 shaft 10 shaft 11 sliding roller 12 sliding roller 13 sliding guide 14 sliding guide 20 elastic drive unit 22 drive arm 23 traction arm 24 drive shaft 25 traction shaft 26 fixing material 27 Fixed shaft 30 Drive rubber (corresponding to elastic material)
40 loading platform 41 loading receiving portion 42 guide roller 43 guide roller 44 loading frame 45 loading frame 46 loading platform fixture 50 carriage 51 pedestal portion 52 protection frame 53 protection frame 54 protection frame 55 wheel

Claims (4)

A pedestal frame installed on a carriage surrounded by a protective frame;
A U-shaped carrier that contacts the protective frame;
A mounting frame for mounting the cargo bed;
One end is rotatably locked to the mounting frame and the pedestal frame, and the other end is locked to a sliding guide fixed to the mounting frame and the pedestal frame in the horizontal direction. An outer arm and an inner arm that intersect with the X shape, which are provided with movable sliding rollers and are opposed to each other in a pair structure;
It comprises an elastic drive part which is locked to a drive arm fixed to either the outer arm or the inner arm whose one end is locked to the pedestal frame and whose other end intersects the X shape. To lift the table. A pedestal frame installed on a carriage surrounded by a protective frame;
A U-shaped carrier that contacts the protective frame;
A mounting frame for mounting the cargo bed;
One end is rotatably locked to the mounting frame and the pedestal frame, and the other end is locked to a sliding guide fixed to the mounting frame and the pedestal frame in the horizontal direction. An outer arm and an inner arm that intersect with the X shape, which are provided with movable sliding rollers and are opposed to each other in a pair structure;
A fixed pulley is locked to the pedestal frame, a moving pulley is locked to an elastic drive unit locked to a drive arm fixed to either the outer arm or the inner arm, and the pedestal frame and the A table lift comprising a combination pulley connected to a drive arm. The elastic drive unit includes a fixing member fixed to the pedestal frame,
The drive arm fixed to either the outer arm or the inner arm;
A plurality of power units connecting the fixing member and the drive arm;
The plurality of power units includes a plurality of annular elastic members and a plurality of pulling arms having different lengths so as to individually pull the elastic members corresponding to the weight of the object placed on the loading platform. The table lift according to claim 1 or 2, wherein the table lift is provided.   The U-shaped loading platform has a horizontally disposed loading receiving portion and loading frames arranged vertically at both ends of the loading receiving portion, and further, the protection of the carriage facing the both ends of the loading receiving portion. The table lift according to claim 1, further comprising a guide roller that assists the vertical movement of the loading platform by contacting the frame.

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