Folding tool cart

Abstract

The application provides a folding tool vehicle, comprising a workbench and a lifting device, the workbench comprises a first workbench and a second workbench above the first workbench, the lifting device is between the first workbench and the second workbench, the lifting device comprises a lifting support and a first locking structure, the lifting support is connected with the workbench through sliding, the lifting support can realize the lifting of the second workbench relative to the first workbench, the first locking structure comprises a locking part and a matching part, the matching part is connected with at least one sliding end of the lifting support, the locking part is connected with the workbench, the locking part and the matching part can be locked / unlocked through mutual cooperation, so that the second workbench is fixed at a preset height through the lifting device. Compared with the prior art, the folding tool vehicle can provide two storage platforms for carrying objects, and can also be folded into a single storage platform.

Description

Technical Field

[0001] This invention relates to the field of tool transport vehicle technology, and in particular to a folding tool cart. Background Technology

[0002] Tool carts are commonly used to move tools and other items. They can move many items at once, saving manpower and effort. Tool carts are widely used in various moving situations.

[0003] Tool carts typically consist of a work surface, a push rod, casters, and other components. A typical tool cart has only one work surface, limiting the number of items it can hold.

[0004] In order to move more items, existing technology also sets up multi-layer storage platforms on tool carts to carry more tools or other items. However, the cart bodies of such tool carts generally cannot be stacked, and they take up too much space when stacked, making them unsuitable for large-scale stacking.

[0005] To facilitate stacking, some tool carts are designed with a folding structure. However, most tool carts cannot be used after being folded, and the upper shelf of the tool cart is fixed by the fixing structure on the lifting bracket, which makes the upper shelf not sturdy and reliable.

[0006] In view of this, it is indeed necessary to provide a folding tool cart to solve this problem. Summary of the Invention

[0007] The purpose of this invention is to provide a folding tool cart that addresses the shortcomings of the aforementioned background technology. The folding tool cart can provide two storage surfaces for moving objects, or it can be folded into a single storage surface. Furthermore, the folding tool cart occupies little space after folding, making it convenient for transportation.

[0008] This invention provides a folding tool cart, including a workbench and a lifting device. The workbench includes a first workbench and a second workbench located above the first workbench. The lifting device is located between the first workbench and the second workbench. The lifting device includes a lifting bracket and a first locking structure. The two ends of the lifting bracket slide relative to the first workbench to achieve the lifting and lowering of the second workbench relative to the first workbench. The first locking structure includes a locking part and a cooperating part. The cooperating part is connected to at least one sliding end of the lifting bracket. The locking part is connected to the workbench. The locking part can cooperate with the cooperating part to lock / unlock, thereby fixing the second workbench at a preset height by the lifting device.

[0009] Furthermore, it also includes a push rod, one end of which is fixedly connected to the first worktable, and the other end is a pusher structure; when the second worktable is fixed at a preset height by the lifting device, the second worktable is also fixedly connected to the push rod.

[0010] Furthermore, one of the push rods is located on one side of the folding tool cart, and the lifting device is located on the other side of the folding tool cart.

[0011] Furthermore, it includes two push rods located on both sides of the folding tool cart.

[0012] Furthermore, it also includes a second locking structure, through which the second worktable is fixedly connected to the push rod; the second locking structure includes at least one first locking hole located on the push rod, a second locking hole located on the second worktable corresponding to the first locking hole, and a pin.

[0013] Furthermore, the second locking structure also includes a second spring, which automatically holds the pin in the first lock hole and the second lock hole.

[0014] Furthermore, the push rod is also provided with a hinge structure. When the second worktable is lowered to the lowest preset height, the part of the push rod above the hinge structure can rotate and fold along the hinge structure to abut against the second worktable.

[0015] Furthermore, the second workbench is also provided with a guide sleeve, which is fitted onto the push rod.

[0016] Furthermore, the first locking structure also includes an operating part, which is connected to the locking part. The locking part is flipped and connected to the worktable via a rotating shaft. The mating part is a ratchet rack, and the locking part can engage with the ratchet teeth of the ratchet rack for locking.

[0017] Furthermore, the first locking structure also includes an operating part, the locking part being connected to the operating part via an elongated member, the mating part being a crossbar, and the locking part being able to engage with the crossbar for locking.

[0018] Furthermore, the operating part can also be used as a handle.

[0019] Furthermore, the first locking structure also includes a first spring, which is used to automatically keep the locking part in the locked state.

[0020] Furthermore, the lifting device also includes a slide rail, which is disposed on the same side or opposite side of the first worktable and the second worktable, and the sliding end of the lifting bracket can slide along the slide rail.

[0021] Furthermore, the lifting bracket is X-shaped, including a first bracket and a second bracket intersecting the first bracket. One end of the first bracket and the second bracket on the same side are slidably connected to the first worktable and the second worktable, respectively, and the other end on the same side is fixedly connected to the second worktable and the first worktable, respectively.

[0022] The folding tool cart provided by the present invention has a lifting device between the first workbench and the second workbench. The lifting device includes a lifting bracket and a first locking structure. The lifting bracket and the first locking structure cooperate to fix the second workbench at a preset height. This allows the folding tool cart to provide two storage surfaces for transporting objects. The first workbench and the second workbench can also be stacked to form a single storage surface, making the usage method flexible and versatile. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the folding tool cart in the first embodiment of the present invention.

[0024] Figure 2 This is a three-dimensional structural diagram of the folding tool cart from another perspective in the first embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the first locking structure of the folding tool cart in the first embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the second locking structure of the folding tool cart in the first embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the articulated structure of the folding tool cart in the first embodiment of the present invention.

[0028] Figures 6 to 8 This is a schematic diagram of the folded state of the folding tool cart in the first embodiment of the present invention.

[0029] Figure 9 This is a three-dimensional structural diagram of the folding tool cart in the second embodiment of the present invention.

[0030] Figure 10 This is a three-dimensional structural diagram of the folding tool cart from another perspective in the second embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the first locking structure of the folding tool cart in the second embodiment of the present invention.

[0032] Figure 12 This is a schematic diagram of the second locking structure of the folding tool cart in the second embodiment of the present invention.

[0033] Figure 13 This is a schematic diagram of the folding tool cart after folding in the second embodiment of the present invention.

[0034] Figure 14 This is a three-dimensional structural diagram of the folding tool cart in the third embodiment of the present invention.

[0035] Figure 15 This is a three-dimensional structural diagram of the folding tool cart from another perspective in the third embodiment of the present invention.

[0036] Figure 16 This is a schematic diagram of the second locking structure of the folding tool cart in the third embodiment of the present invention.

[0037] Figure 17 This is a schematic diagram of the folding tool cart after folding according to the third embodiment of the present invention. Detailed Implementation

[0038] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0040] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this invention are defined by the position of the structures in the drawings and the relative positions of the structures, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0041] [First Embodiment]

[0042] Please refer to the following: Figures 1 to 5 This embodiment provides a folding tool cart, including a workbench 1 and a lifting device 2. The workbench 1 includes a first workbench 11 and a second workbench 12, with the second workbench 12 positioned above the first workbench 11. The lifting device 2 is positioned between the first workbench 11 and the second workbench 12. The lifting device 2 includes a lifting bracket 20 and a first locking structure 31. The lifting bracket 20 slides relative to the first workbench 11 at both ends. The first locking structure 31 includes a locking part 311 and a mating part 312. The mating part 312 is connected to at least one sliding end of the lifting bracket 20, and the locking part 311 is connected to the workbench 1. The locking part 311 and the mating part 312 can cooperate to lock / unlock, thereby fixing the second workbench 12 at a preset height via the lifting device 2.

[0043] Specifically, such as Figure 1 and 2 As shown, there are two lifting supports 20, symmetrically arranged on both sides of the folding tool cart. Each lifting support 20 is X-shaped, comprising a first support 201 and a second support 202 intersecting the first support 201. One end of the first support 201 and the second support 202 on the same side are slidably connected to the first worktable 11 and the second worktable 12, respectively, while the other end on the same side is fixedly connected to the second worktable 12 and the first worktable 11, respectively. The lifting supports 20 are used to raise the second worktable 12 away from the first worktable 11 or lower it closer to the first worktable 11.

[0044] In this embodiment, a first mounting beam 111 is provided on each side of the upper surface of the first workbench 11 facing the second workbench 12, and a second mounting beam 122 is provided on each side of the lower surface of the second workbench 12 facing the first workbench 11. One end of the second bracket 202 is hinged to the first mounting beam 111, and the other end of the second bracket 202 is slidably connected to the second mounting beam 122. One end of the first bracket 201 is hinged to the second mounting beam 122, and the other end of the first bracket 201 is slidably connected to the first mounting beam 111. The first bracket 201 and the second bracket 202 are rotatably hinged together by a pin.

[0045] Furthermore, both the first mounting beam 111 and the second mounting beam 122 are provided with slide rails 21, and the extending direction of the slide rails 21 is consistent with the length direction of the first mounting beam 111 and the second mounting beam 122. The sliding ends of the first bracket 201 and the second bracket 202 can be slidably connected to the corresponding slide rails 21 by rollers or balls, so that the sliding end of the lifting bracket 20 can slide along the slide rails 21.

[0046] Furthermore, the slide rail 21 is located on the same side or opposite side of the first worktable 11 and the second worktable 12. Preferably, it is located on the same side, which occupies a smaller area and facilitates the first worktable 11 to pick up or place items.

[0047] In this embodiment, as Figure 3 As shown, the locking part 311 is fixed to the bottom surface of the second worktable 12 facing the first worktable 11. The mating part 312 is a crossbar 312b, the two ends of which are connected to rollers or balls on the slide rail 21 and can move synchronously with the sliding end of the lifting bracket 20. The locking part 311 has a hook, which can be engaged with the crossbar 312b for locking. When the hook of the locking part 311 disengages from the mating part 312, the locking part 311 and the mating part 312 are unlocked, the sliding end of the lifting bracket 20 moves, and the second worktable 12 can move relative to the first worktable 11.

[0048] Furthermore, the first locking structure 31 also includes an operating part 313. The locking part 311 is connected to the operating part 313 via an elongated member. The operating part 313 is used to separate the hook of the locking part 311 from the locking part 311.

[0049] Furthermore, the operating part 313 can also be used as a handle, so that the operator can hold the handle during the lifting and lowering of the second worktable 12, which not only unlocks the locking part 311, but also achieves the smooth lifting and lowering of the second worktable 12.

[0050] Furthermore, the first locking structure 31 also includes a first spring (not shown in the figure), which is used to automatically hold the locking part 311 in the locked state. In this embodiment, the first spring is a torsion spring, which is disposed inside the locking part 311, and the locking part 311 is a flip-locking structure.

[0051] The operating part 313 is also equipped with a spring to synchronize with the locking part 311 and keep it in the retracted state. When the operating part 313 is pulled out by hand, the force of the hand overcomes the elastic force of the first spring and the spring on the operating part, causing the hook of the locking part 311 to rotate and disengage from the mating part 312 (crossbar 312b) to unlock. After the external force is released, when the mating part 312 (crossbar 312b) abuts against the locking part 311, the hook of the locking part 311 automatically engages with the mating part 312 (crossbar 312b) and remains locked under the action of the first spring.

[0052] Furthermore, there are two first locking structures 31, and the operating parts 313 of the two first locking structures 31 are respectively disposed at both ends of the second worktable 12.

[0053] Furthermore, the lifting device 2 also includes a push rod 4, one end of which is fixedly connected to the first worktable 11, and the other end is a pusher structure 40. When the second worktable 12 is fixed at a preset height by the lifting device 2, the second worktable 12 is also fixedly connected to the push rod 4.

[0054] In this embodiment, the push rod 4 is located on one side of the folding tool cart, and the lifting device 21 is located on the other side of the folding tool cart. The push rod 4 and the lifting device 21 can simultaneously fix the second workbench at a preset height. Compared with placing the lifting bracket 20 in the middle, this structure not only ensures the stability of the second workbench 12, but also makes it easier for users to take items placed on the first workbench 11 from both sides (i.e., the gap between the lifting bracket 20 and the push rod 4) and the opposite side away from the push rod 4, making it convenient to take items from the innermost side (i.e., the side closest to the push rod 4).

[0055] Furthermore, the lifting device 2 also includes a second locking structure 32, and the second worktable 12 is fixedly connected to the push rod 4 through the second locking structure 32; the second locking structure 32 includes at least one first locking hole 41 located on the push rod 4, a second locking hole 121 located on the second worktable 12 corresponding to the first locking hole 41, and a pin 321.

[0056] Specifically, the end of the push rod 4 closest to the pusher structure 40 is defined as the upper end, and the end closest to the first workbench 1 is defined as the lower end. The first locking hole 41 is located at both ends of the push rod 4. The first locking hole 41 at the upper end of the push rod 4 can fix the second workbench 12 in a preset upper position, giving the folding tool cart two usable storage surfaces. The first locking hole 41 at the lower end of the push rod 4 can fix the second workbench 12 in a preset lower position, allowing the second workbench 12 of the folding tool cart to stack on the first workbench 11. In this case, only one usable storage surface is available. The locking of the second locking structure 32 at this point strengthens the push rod 4. It can be understood that the first locking hole 41 can be set at any desired position on the push rod 4.

[0057] In this embodiment, the push rod 4 is also provided with a hinge structure 42. When the second workbench 12 is lowered to the lowest preset height, part of the push rod 4 above the hinge structure 42 can be rotated and folded along the hinge structure 42 and abut against the second workbench 12, so that the space occupied by the folding tool cart is further reduced.

[0058] Please refer to this again. Figure 1 and Figure 6 The first worktable 11 is equipped with a mounting base 112, and the push rod 4 is hinged to the mounting base 112. The mounting base 112 is equipped with an arc-shaped guide rail 113, and the push rod 4 has a radially extending convex shaft (not shown in the figure), which is locked inside the arc-shaped guide rail 113. When the second worktable 12 is disengaged from the push rod 4, the push rod 4 can be pulled to rotate outward to a certain tilt angle to avoid interference between the second worktable 12 and the push rod 4 during up-and-down movement.

[0059] like Figures 6 to 8 As shown, the folding process of the folding tool cart in this embodiment is as follows: First, disengage the second workbench 12 from the push rod 4, rotate the push rod 4 outward to a certain tilt angle, pull the operating handle 42 outward with both hands and press down on the second workbench 12 until it abuts against the first workbench 11, rotate the push rod 4 in the opposite direction to reset it, and then fix the second workbench 12 and the push rod 4 to form a single-layer workbench shape. When the folding tool cart needs to be stored, the upper part of the push rod 4 can be folded down to abut against the second workbench 12 to reduce its space occupation.

[0060] The beneficial effects of the folding tool cart provided in this embodiment are as follows: The folding tool cart, by setting a lifting device 2 between the first workbench 11 and the second workbench 12, includes a lifting bracket 20 and a first locking structure 31. The lifting bracket 20 and the first locking structure 31 cooperate to fix the second workbench 12 at a preset height. This allows the folding tool cart to provide two storage surfaces for transporting objects, and the first workbench 11 and the second workbench 12 can be stacked to form a single storage surface, making its use flexible and versatile. Furthermore, the upper part of the push rod 4 can be further folded and pressed against the second workbench 12, reducing space occupation and facilitating transportation. Furthermore, the folding tool cart can simultaneously position the second workbench 12 through the second locking structure 32 and the first locking structure 31, making the second workbench 12 more secure and reliable.

[0061] [Second Embodiment]

[0062] Please refer to the following: Figures 9 to 13 The difference between this embodiment of the folding tool cart and the first embodiment is that the locking part 311 of the first locking structure 31 is connected to the worktable 1 (second worktable 12) via a rotating shaft. The mating part 312 is a ratchet rack 312a, and the locking part 311 is a pawl. The locking part 311 can engage with the ratchet teeth of the ratchet rack 312a for locking. Compared with the first embodiment, in this embodiment, the first locking 31 can fix the second worktable 12 at multiple heights, making operation more flexible.

[0063] Specifically, such as Figure 11 As shown (the second worktable 12 is hidden in the figure for easier viewing), the ratchet rack 312a is fixed inside the second mounting beam 122 of the second worktable 12. When the second worktable 12 moves to the preset fixed position, the pawl engages with the ratchet rack 312a to fix the position of the second worktable 12. When the pawl is also equipped with a pressing plate, pulling the pressing plate upward will cause the pawl to rotate upward and disengage from the ratchet rack 312a. At the same time, the pressing plate can also be used as a handle.

[0064] The first locking structure 31 also includes an operating part 313, which is disposed on the pressing plate of the pawl. Rotating the pressing plate can disengage the pawl from the ratchet rack 312a.

[0065] Furthermore, the locking part 311 is also provided with a first spring (not shown in the figure). The first spring is a torsion spring and is used to keep the locking part 311 (pawl) in the locked state automatically.

[0066] Furthermore, the second worktable 12 is also provided with a guide sleeve 123, which is fitted onto the push rod 4. The second locking hole 121 is provided on the guide sleeve 123.

[0067] like Figure 9 and Figure 12 As shown, the pin 321 of the second locking structure 32 is fixed at the position of the second worktable 12 near the guide sleeve 123. After the pin 321 passes through the guide sleeve 123, it can be inserted into the first locking hole 41 located on the push rod 4 to fix the second worktable 12 in the preset position.

[0068] Other structures of the folding tool cart in this embodiment can be referred to the first embodiment above, and will not be repeated here.

[0069] The folding process of the folding tool cart in this embodiment is as follows: When the second workbench 1 is fixed in the preset position above, the folding tool cart has two storage surfaces (such as upper and lower). Figure 9 , Figure 10 As shown), when folding is required, first separate the pin 321 of the second locking structure 32 from the first locking hole 41, then unlock the locking part 311 (pawl) of the first locking structure 31 from the mating part 312 (ratchet 312a), press down the second worktable 12 until it is against the stacked first worktable 11, and then fix the second worktable 12 in the lowest preset position through the second locking structure 32 to form a single storage table (as shown). Figure 13 (As shown).

[0070] [Third Embodiment]

[0071] Please refer to the following: Figures 14 to 17 The difference between this embodiment of the folding tool cart and the first and second embodiments is that: there are two push rods 4, which are located on both sides of the folding tool cart respectively, the lifting device 2 is located between the two push rods 4, and the second locking structure 32 also includes a second spring 322, which automatically keeps the pin 321 in the first lock hole 41 and the second lock hole 121.

[0072] Specifically, the second worktable 12 is provided with a guide sleeve 123, which is sleeved on the push rod 4. The second locking hole 121 is provided on the guide sleeve 123, and the second locking structure 32 is provided on the second worktable 12 and located between the two guide sleeves 123.

[0073] The second locking structure 321 includes two symmetrically arranged pins 321 and a second spring 322 located between the two pins 321. The ends of the two pins 321 away from the second spring 322 are respectively inserted into the second locking holes 121 of the two guide sleeves 123 and the first locking hole 41 on the push rod 4 to fix them in a preset position. The pins 321 are provided with operating handles. By pulling the operating handles to overcome the elastic force of the second spring 322, the pins 321 can be separated from the push rod 4.

[0074] The first locking structure 31 is not shown in the folding tool cart of this embodiment. The first locking structure 31 can be any structure from the first embodiment or the second embodiment. Please refer to the first and second embodiments above for details, which will not be repeated here. It is understood that the first locking structure 31 may also be omitted in other embodiments.

[0075] The folding process of the folding tool cart in this embodiment is as follows: When the second workbench 1 is fixed in the preset position above, the folding tool cart has two storage surfaces (such as upper and lower). Figure 14 , Figure 15 As shown), when folding is required, first separate the pin 321 of the second locking structure 32 from the first locking hole 41. If a first locking structure 31 is provided, then unlock the locking part 311 of the first locking structure 31 from the mating part 312. Then press down the second worktable 12 until it is against the stacked first worktable 11. Then, fix the second worktable 12 in the lowest preset position through the second locking structure 32 to form a single storage table (as shown). Figure 17 (As shown).

[0076] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A folding tool cart, comprising a workbench (1) and a lifting device (2), wherein the workbench (1) comprises a first workbench (11) and a second workbench (12) located above the first workbench (11), and the lifting device (2) is located between the first workbench (11) and the second workbench (12), characterized in that, The lifting device (2) includes a lifting bracket (20) and a first locking structure (31). The two ends of the lifting bracket (20) slide relative to the worktable (1) to achieve the lifting of the second worktable (12) relative to the first worktable (11). The first locking structure (31) includes a locking part (311) and a cooperating part (312). The cooperating part (312) is connected to at least one sliding end of the lifting bracket (20). The locking part (311) is connected to the worktable (1). The locking part (311) can cooperate with the cooperating part (312) to lock / unlock, thereby fixing the second worktable (12) at a preset height by the lifting device (2).

2. The folding tool cart according to claim 1, characterized in that, It also includes a push rod (4), one end of which is fixedly connected to the first workbench (11), and the other end is a pusher structure (40); when the second workbench (12) is fixed at a preset height by the lifting device (2), the second workbench (12) is also fixedly connected to the push rod (4).

3. The folding tool cart according to claim 2, characterized in that, The push rod (4) is located on one side of the folding tool cart, and the lifting device (2) is located on the other side of the folding tool cart.

4. The folding tool cart according to claim 2 or 3, characterized in that, It includes two push rods (4) located on both sides of the folding tool cart.

5. The folding tool cart according to claim 2, characterized in that, It also includes a second locking structure (32), the second worktable (12) is fixedly connected to the push rod (4) through the second locking structure (32); the second locking structure (32) includes at least one first locking hole (41) on the push rod (4), a second locking hole (121) on the second worktable (12) corresponding to the first locking hole (41) and a pin (321).

6. The folding tool cart according to claim 5, characterized in that, The second locking structure (32) further includes a second spring (322) that automatically holds the pin (321) in the first lock hole (41) and the second lock hole (121).

7. The folding tool cart according to claim 2, characterized in that, The push rod (4) is also provided with a hinge structure (42). When the second worktable (12) is lowered to the lowest preset height, the part of the push rod (4) above the hinge structure (42) can be rotated and folded along the hinge structure (42) and abut against the second worktable (12).

8. The folding tool cart according to claim 2, characterized in that, The second workbench (12) is also provided with a guide sleeve (123), which is sleeved on the push rod (4).

9. The folding tool cart according to claim 1, characterized in that, The first locking structure (31) further includes an operating part (313), which is connected to the locking part (311). The locking part (311) is flipped and connected to the worktable (1) via a rotating shaft. The mating part (312) is a ratchet rack (312a), and the locking part (311) can be engaged between the ratchet teeth of the ratchet rack (312a) for locking.

10. The folding tool cart according to claim 1, characterized in that, The first locking structure (31) further includes an operating part (313), the locking part (311) is connected to the operating part (313) via a slender member, the mating part (312) is a crossbar (312b), and the locking part (311) can be engaged with the crossbar (312b) for locking.

11. The folding tool cart according to claim 9 or 10, characterized in that, The operating part (313) can also be used as a handle.

12. The folding tool cart according to claim 9 or 10, characterized in that, The first locking structure (31) further includes a first spring for automatically keeping the locking part (311) in the locked state.

13. The folding tool cart according to claim 1, characterized in that, The lifting device (2) also includes a slide rail (21), which is located on the same side or opposite side of the first workbench (11) and the second workbench (12). The sliding end of the lifting bracket (20) can slide along the slide rail (21).

14. The folding tool cart according to claim 1, characterized in that, The lifting support (20) is X-shaped and includes a first support (201) and a second support (202) that is intersected with the first support (201). One end of the first support (201) and the second support (202) on the same side are slidably connected to the first workbench (11) and the second workbench (12) respectively, and the other end on the same side is fixedly connected to the second workbench (12) and the first workbench (11) respectively.

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