Partition

Abstract

A partition according to one aspect of the present invention may comprise a main frame in the shape of a square frame, a connecting device provided at the bottom of the main frame to connect the main frame to another adjacent main frame or partition column, and clamps provided at each of the upper corner portions of the main frame in a recessed state to connect the main frame to another adjacent main frame or partition column.

Description

Technology Field

[0001] The present invention relates to a partition, and more specifically, to a partition capable of improving usability. Background Technology

[0003] Generally, a partition refers to a panel used to divide a space for more efficient use, and the installation of partitions in office furniture is commonplace.

[0004] Such partitions are being developed in various ways due to their advantages, such as the ability to create dedicated spaces for consultations and meetings beyond simple partition functions, and the ability to maintain a pleasant working environment through soundproofing.

[0005] Meanwhile, partitions are installed by continuously combining multiple partitions in a horizontal or vertical direction, taking into account the area of ​​the performance space, the degree of space division, or the structure of the building, and when the performance space or the degree of space division is changed, the combined partitions are separated and reinstalled.

[0006] Conventional partitions require separate parts when connecting multiple units, but assembly becomes impossible if parts are not shipped, shipped incorrectly, or lost on-site, leading to an increase in management points.

[0007] Accordingly, there is a need for the development of partitions that can be easily assembled or disassembled by anyone without separate parts. Prior art literature

[0009] Republic of Korea Published Patent Application No. 10-2025-0091173 (June 20, 2025) The problem to be solved

[0010] The present invention has been devised to solve the aforementioned problems, and the objective of the present invention is to provide a partition that facilitates construction and relocation by enabling multiple units to be easily combined or separated in a vertical or horizontal direction without separate parts.

[0011] In addition, it provides a partition that can be combined or separated with minimal disassembly or damage.

[0012] In addition, it provides partitions that can improve reusability.

[0013] In addition, it provides a partition that can be connected at a consistent height even on sloped or uneven floors by flexibly adapting to the floor surface when height imbalances occur due to deviations caused by the installation surface being sloped or uneven. means of solving the problem

[0015] A partition according to one embodiment of the present invention for achieving the above-mentioned purpose may comprise a main frame in the shape of a square frame, a connecting device provided at the bottom of the main frame to connect the main frame to another adjacent main frame or partition column, and clamps provided at each of the upper corner portions of the main frame in a recessed state to connect the main frame to another adjacent main frame or partition column.

[0016] The main frame comprises a pair of vertical members extending in the vertical direction, an upper horizontal member extending in the left-right direction and contacting the upper inner surface of the pair of vertical members to be coupled with the pair of vertical members, and a lower horizontal member extending in the left-right direction and contacting the lower inner surface of the pair of vertical members to be coupled with the pair of vertical members, wherein the connecting device is provided at the lower end of each of the pair of vertical members in the longitudinal direction, and the clamp may be provided in a form in which it is fixed at each end of the upper horizontal member in the longitudinal direction, with one end protruding in the direction of the vertical members.

[0017] The clamp may comprise a 'U'-shaped body, a lever located in the inner space of the body and hinge-coupled to the body, a latch located in the inner space of the body and positioned between the body and the lever to hinge-couple to the body and the lever, and a fastening member that penetrates the body, the lever and the latch to hinge-couple the body, the lever and the latch.

[0018] The body may comprise a horizontal plate extending in one direction, a pair of vertical plates each provided in an upright form at both ends of the horizontal plate in the width direction, a through hole formed in each of the pair of vertical plates and extending along the length direction of the vertical plate to allow the fastening member to pass through and move, a rotation prevention projection provided in a form protruding from one inner surface of the vertical plate and positioned at the upper end of one side of the through hole to prevent rotation of the lever when the lever is not operated, a lever projection provided in a form protruding from the other side of the through hole to act as a lever for the lever that is tilted when the lever is operated, and a support projection extending from the other end of the horizontal plate on the side of the lever projection to support the tilted lever.

[0019] The lever may be provided to be in contact with one inner surface of a pair of vertical plates, and may include a pair of fastening plates through which a fastening member passes at one end, a connecting plate that integrates the pair of fastening plates, and an operating plate that extends from the connecting plate but is inclined at a certain angle from the connecting plate to operate the lever.

[0020] The above latch may be provided with a movable block that is provided long along the longitudinal direction of the body, through which the fastening member passes at one end and which is movable in the longitudinal direction of the body by the operation of the lever, and a horizontal locking projection provided at the other end of the movable block and extending in the width direction of the movable block to engage with a locking groove formed in the vertical member of another main frame or the partition column that is adjacent and in contact with it.

[0021] The above vertical member is provided with a locking part on the other side corresponding to the one side in contact with the upper horizontal member, positioned at the bottom of the locking groove, and bent in the inward direction of the vertical member, and the latch may be provided with a vertical locking projection that engages with the locking part by being provided in an L-shape from one side of the horizontal locking projection toward the other end of the movable block.

[0022] The above fastening member may be provided with a shaft that moves along the longitudinal direction of the through hole by penetrating the through hole, the fastening plate, and the movable block, and a finishing cap that is fastened to one end of the shaft to maintain the state in which the shaft has penetrated.

[0023] The above connecting device comprises a base plate provided on the other side corresponding to the one side of the vertical member that contacts the lower horizontal member, and a hook connected to the base plate and provided to be rotatable from the base plate, wherein the hook can be fastened to another hook facing it by rotating the hook provided on one of the pair of connecting devices facing each other.

[0024] The above hook may have a guide surface provided at one end, a ring groove that extends from the guide surface and is guided and inserted into the guide surface provided on another hook facing it, a rotation axis connected to the base plate to allow the hook to rotate, and a stopper located at the other end corresponding to the guide surface to limit the rotation of the hook, and the base plate may have a mounting space that allows the hook to be fastened to another hook facing it after being rotated by the rotation axis.

[0025] The device may further include an auxiliary frame provided in the inner space of the main frame to increase the structural rigidity of the main frame, a finishing panel provided in a plate shape to cover both sides of the main frame, a cover coupled to the top of the main frame to cover the top of the main frame, and a height adjustment device provided at the bottom of the main frame to adjust the height of the main frame. Effects of the invention

[0027] According to the partition of the present invention, multiple units can be easily combined or separated in a vertical or horizontal direction without separate parts, thereby facilitating construction and relocation.

[0028] In addition, partitions that can be combined or separated with minimal disassembly or damage can be provided.

[0029] In addition, reusability can be improved.

[0030] In addition, if an imbalance in height occurs due to deviations caused by the installation surface being sloped or uneven, it can flexibly adapt to the surface to ensure a consistent height even on sloped or uneven surfaces. Brief explanation of the drawing

[0032] FIGS. 1 and FIGS. 2 are drawings showing a partition according to an embodiment of the present invention. FIG. 3 is a drawing showing part A illustrated in FIG. 1. FIGS. 4 to 7 are drawings showing the clamp illustrated in FIG. 3. FIG. 8 is a drawing showing part B illustrated in FIG. 1. FIG. 9 is a drawing showing part C illustrated in FIG. 1. FIGS. 10 and FIGS. 11 are drawings showing the connecting device illustrated in FIGS. 9. Specific details for implementing the invention

[0033] Hereinafter, a partition according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0035] FIGS. 1 and FIGS. 2 are drawings showing a partition according to an embodiment of the present invention.

[0036] As illustrated in FIGS. 1 and 2, a partition (10) according to one embodiment of the present invention comprises a main frame (100) having a rectangular frame shape, an auxiliary frame (200) provided in the inner space of the main frame (100) to increase the structural rigidity of the main frame (100), a finishing panel (300) provided in a plate shape to cover both sides of the main frame (100), a cover (400) coupled to the top of the main frame (100) to cover the top of the main frame (100), a height adjustment device (500) provided at the bottom of the main frame (100) to adjust the height of the main frame (100), a connecting device (700) provided at the bottom of the main frame (100) to connect the main frame (100) to another adjacent main frame (100) or partition column (600), and each provided in a state inserted into the upper corner portions of the main frame (100). A clamp (800) may be provided to allow the main frame (100) to be connected to another adjacent main frame (100) or partition column (600).

[0037] And the main frame (100) may be provided with a pair of vertical members (110) that are long in the vertical direction, an upper horizontal member (120) that is long in the left-right direction and is in contact with the upper inner surface of the pair of vertical members (110) and is coupled to the pair of vertical members (110), and a lower horizontal member (130) that is long in the left-right direction and is in contact with the lower inner surface of the pair of vertical members (110) and is coupled to the pair of vertical members (110).

[0038] The upper horizontal member (120) is provided to form a line with the upper part of the vertical member (110), and the lower horizontal member (130) may be provided at a position slightly higher than the lower part of the vertical member (110) or provided to form a line with the lower part of the vertical member (110), as shown in the drawing.

[0039] The vertical member (110), upper horizontal member (120), and lower horizontal member (130) are generally provided in the shape of a rectangular pipe that is long in one direction, but are not limited thereto and can be provided in various shapes considering the purpose of use or installation location.

[0040] The auxiliary frame (200) is generally provided in the shape of a rectangular pipe that is long in one direction, similar to the vertical member (110), upper horizontal member (120), and lower horizontal member (130), but is not limited thereto. As shown in the drawing, it may be provided long in the left-right direction to be connected to the vertical member (110), or long in the up-down direction to be connected to the upper horizontal member (120) and lower horizontal member (130), and at least one may be provided considering the overall size of the main frame (100).

[0041] The finishing panel (300) and the cover (400) serve to cover the main frame (100) and form the outer surface of the partition (10), and various materials and patterns may be applied considering the purpose of use or installation location.

[0042] The height adjustment device (500) can be connected to a constant height even on a sloping or uneven floor surface by adjusting its length to respond to the deviation when a height imbalance occurs due to a deviation caused by the floor surface where a partition (10), in which a plurality of main frames (100) are continuously assembled in a vertical or horizontal direction, is installed, thereby allowing it to flexibly respond to the deviation.

[0043] Meanwhile, the partition column (600), connecting device (700), and clamp (800) can be used to connect multiple adjacent main frames (100) when multiple main frames (100) are installed continuously in a vertical or horizontal direction.

[0044] The connecting device (700) is fixed in a state where it is inserted into the lower end of each pair of vertical members (110), and the clamp (800) is fixed in a state where it is inserted into both ends in the longitudinal direction of the upper horizontal member (120), so that one end protrudes in the direction of the vertical member (110), and can be handled by a worker when connecting a plurality of adjacent main frames (100) or when connecting one main frame (100) to a partition column (600).

[0045] In this way, by providing a connecting device (700) and a clamp (800) to the main frame (100), when installing multiple main frames (100) continuously in a vertical or horizontal direction, no separate parts are required, so it is possible to prevent problems such as failure to ship, incorrect shipment, inability to assemble due to loss at the site, and an increase in management points in advance.

[0046] Next, a clamp (800) of a partition (10) according to one embodiment of the present invention will be described in detail. In the following description, only the parts that differ from the above-described embodiment will be described in detail, and detailed descriptions of identical or extremely similar parts will be omitted.

[0048] FIG. 3 is a drawing showing part A shown in FIG. 1, FIG. 4 to 7 are drawings showing the clamp shown in FIG. 3, and FIG. 8 is a drawing showing part B shown in FIG. 1.

[0049] Referring to FIGS. 1 to 8, a partition (10) according to one embodiment of the present invention may be provided with a clamp (800) that is inserted into each of the upper corner portions of a main frame (100) so that the main frame (100) can be connected to another adjacent main frame (100) or partition column (600).

[0050] And the clamp (800) may be provided with a ‘U’-shaped body (810), a lever (820) located in the inner space of the body (810) and hinge-connected to the body (810), a latch (830) located in the inner space of the body (810) and positioned between the body (810) and the lever (820) and hinge-connected to the body (810) and the lever (820), and a fastening member (840) that passes through the body (810), the lever (820), and the latch (830) and hinge-connects the body (810), the lever (820), and the latch (830).

[0051] The clamp (800) may be provided in a state where the body (810), lever (820), and latch (830) are connected by a fastening member (840), such that the body (810) supports the lever (820) and the latch (830), the lever (820) covers the latch (830), and the latch (830) protrudes to one side.

[0052] The body (810) comprises a horizontal plate (811) that is elongated in one direction, a pair of vertical plates (812) each provided in an upright form at both ends of the horizontal plate (811) in the width direction, a through hole (813) formed in each of the pair of vertical plates (812) and extended along the length direction of the vertical plate (812) to allow a fastening member (840) to pass through and move, a rotation prevention projection (814) provided in a form protruding from one inner surface of the vertical plate (812) and positioned at the upper end of one side of the through hole (813) to prevent rotation of the lever (820) when the lever (820) is not operated, a lever projection (815) provided in a form protruding from the other side of the through hole (813) and acting as a lever of the lever (820) that is flipped when the lever (820) is operated, and a lever of the horizontal plate (811). A support projection (816) that supports the lever (820) extended from the other end of the projection (815) can be provided.

[0053] The horizontal plate (811) of the body (810) serves to support the lever (820) and the latch (830), and a pair of vertical plates (812) are provided with through holes (813) in the shape of elongated holes, so that the fastening member (840) can move along the longitudinal direction of the vertical plates (812) while connecting the body (810), the lever (820), and the latch (830).

[0054] The lever (820) may be provided to be in contact with one inner surface of a pair of vertical plates (812) and may be provided with a pair of fastening plates (821) through which a fastening member (840) passes at one end, a connecting plate (822) that integrates the pair of fastening plates (821), and an operating plate (823) that extends from the connecting plate (822) and extends at a certain angle from the connecting plate (822) to operate the lever (820).

[0055] And the lever (820) can be provided by making a pair of fastening plates (821), connecting plates (822), and operating plates (823) by bending and folding a single member, or by making a pair of fastening plates (821), connecting plates (822), and operating plates (823) separately and integrating them through welding or other methods.

[0056] The latch (830) may be provided along the longitudinal direction of the body (810), with a fastening member (840) passing through one end and a movable block (831) that moves along the longitudinal direction of the body (810) by the operation of a lever (820), and a horizontal catch (832) provided at the other end of the movable block (831) and extending in the width direction of the movable block (831) to engage with a catch groove (140, 610) formed in a vertical member (110) or partition column (600) of another main frame (100) that is adjacent and in contact with it.

[0057] Additionally, the fastening member (840) may be provided with a shaft (841) that moves along the longitudinal direction of the through hole (813) by passing through the through hole (813), the fastening plate (821), and the movable block (831), and a finishing cap (842) that is fastened to one end of the shaft (841) to maintain the state in which the shaft (841) passes through.

[0058] The end cap (842) is attached to one end of the shaft (841) while the shaft (841) is passing through the through hole (813), the fastening plate (821), and the movable block (831), and after attachment, it is integrated with the shaft (841) through a method such as welding to prevent the shaft (841) from detaching from the through hole (813), the fastening plate (821), and the movable block (831).

[0059] Meanwhile, the method of connecting another main frame (100) or partition column (600) adjacent to the main frame (100) through a clamp (800) is as follows.

[0060] First, when the lever (820) is not operated, that is, when the main frame (100) is not connected to another adjacent main frame (100) or partition column (600), or when the clamp (800) is fixed to the upper horizontal member (120) after production is complete, the fastening plate (821) of the lever (820) can be maintained in a state where rotation through the fastening member (840) is prevented by the anti-rotation projection (814).

[0061] When the lever (820) is operated, that is, when connecting the main frame (100) to another adjacent main frame (100) or partition column (600), the operator flips the lever (820) through the control plate (823), and the fastening plate (821) passes over the anti-rotation projection (814), and at the same time, the fastening member (840) can move to the opposite side along the through hole (813).

[0062] The lever (820), which is moved to the opposite side of the through hole (813) along the fastening member (840), comes into contact with the lever projection (815) and is fully tilted using the lever projection (815) as a lever to come into contact with the vertical plate (812) and the support projection (816), and at the same time, the movable block (831) of the latch (830) can extend its protruding length in the opposite direction to the direction in which the lever (820) is tilted.

[0063] A movable block (831), with a protruding length increased in the opposite direction to the direction in which the lever (820) is flipped, can lift a horizontal catch (832) extended in the width direction of the movable block (831) at the other end of the movable block (831) and catch on a catch groove (140, 610) formed on a vertical member (110) or partition column (600) of another adjacent main frame (100), and accordingly, another main frame (100) or partition column (600) adjacent to the main frame (100) can be connected.

[0064] In this way, according to one embodiment of the present invention, the partition (10) can easily install a plurality of main frames (100) continuously in a vertical or horizontal direction by using a lever (820) to cause the horizontal catch (832) of the latch (830) to catch on a catch groove (140, 610) formed on an adjacent main frame (100) or partition column (600), and at the same time fixing the caught state.

[0065] In addition, anyone can easily assemble and disassemble it without separate tools, and since it can be connected regardless of left or right, it can effectively improve ease of installation.

[0066] Meanwhile, the vertical member (110) may be provided with a locking part (150) that is bent inward toward the vertical member (110) on the other side corresponding to the side that contacts the upper horizontal member (120) and is located at the bottom of the locking groove (140).

[0067] Here, the latch (830) of the clamp (800) is provided with a vertical catch (833), and the vertical catch (833) is provided in an L-shape from one side of the horizontal catch (832) toward the other end of the movable block (831) and engages with the catch portion (150), thereby having the effect of further improving the fixing performance of the clamp (800).

[0068] Next, a connection device (700) of a partition (10) according to an embodiment of the present invention will be described in detail. In the following description, only parts that differ from the above-described embodiment will be described in detail, and detailed descriptions of identical or extremely similar parts will be omitted.

[0070] FIG. 9 is a drawing showing part C shown in FIG. 1, and FIG. 10 and FIG. 11 are drawings showing the connecting device shown in FIG. 9.

[0071] Referring to FIGS. 1 to 11, a partition (10) according to one embodiment of the present invention may be provided with a connecting device (700) that is provided at the bottom of a main frame (100) and allows the main frame (100) to be connected to another adjacent main frame (100) or partition column (600).

[0072] The connecting device (700) may be provided with a base plate (710) on the other side corresponding to the side in contact with the lower horizontal member (130) of the vertical member (110), and a hook (720) connected to the base plate (710) and configured to be rotatable from the base plate (710).

[0073] Here, when connecting another main frame (100) adjacent to the main frame (100), a hook (720) provided on one of a pair of connecting devices (700) facing each other, each provided on the main frame (100), can be rotated from the base plate (710) and connected to another hook (720) facing it.

[0074] To this end, the hook (720) may be provided with a guide surface (721) provided at one end, a ring groove (722) that extends from the guide surface (721) and is guided and inserted into the guide surface (721) provided on another hook (720) facing it, a rotation axis (723) connected to a base plate (710) to allow the hook (720) to rotate, and a stopper (724) located at the other end to correspond to the guide surface (721) to limit the rotation of the hook (720).

[0075] When a hook (720) provided on one of a pair of connecting devices (700) facing each other is rotated through a rotation axis (723), a ring groove (722) provided on the hook (720) is guided and inserted into a guide curved surface (721) of another hook (720), and at this time, the rotation of the other hook (720) can be restricted by a stopper (724).

[0076] A pair of hooks (720) facing each other can switch roles, allowing for connection regardless of left or right, and enabling connection at a constant height even if the floor surface is irregular, thereby improving constructability.

[0077] Meanwhile, the base plate (710) is provided with a mounting space (711), and the mounting space (711) serves to secure space so that the hook (720) can be easily attached to another hook (720) facing it after being rotated by the rotation axis (723), thereby allowing another main frame (100) adjacent to the main frame (100) to be easily connected through the connecting device (700).

[0079] Although a partition according to one embodiment of the present invention has been described above, the concept of the present invention is not limited to the embodiments presented in this specification. Furthermore, those skilled in the art who understand the concept of the present invention may easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same concept, and such embodiments shall also be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0081] 10: Partition 100: Mainframe 110: Vertical member 120: Upper horizontal member 130: Lower horizontal member 140: Locking groove 150: Locking part 200: Auxiliary frame 300: Finishing panel 400: Cover 500: Height adjustment device 600: Partition column 610: Locking groove 700: Connecting device 710: Baseplate 711: Mounting space 720: Hook 721: Guide surface 722: Ring groove 723: Rotation axis 724: Stopper 800: Clamp 810: Body 811: Horizontal plate 812: Vertical plate 813: Through hole 814: Anti-rotation projection 815: Lever projection 816: Support protrusion 820: Lever 821: Fastening plate 822: Connecting plate 823: Control panel 830: Latch 831: Movable block 832: Horizontal stopper 833: Vertical stopper 840: Fastening member 841: Shaft 842: End cap

Claims

Claim 1 The apparatus comprises a main frame in the shape of a square frame, a connecting device provided at the bottom of the main frame to connect the main frame to another adjacent main frame or partition column, and clamps provided respectively in a recessed state at the upper corner portions of the main frame to connect the main frame to another adjacent main frame or partition column, wherein the clamp comprises a 'U'-shaped body, a lever located in the inner space of the body and hinge-coupled to the body, a latch located in the inner space of the body and positioned between the body and the lever to hinge-couple the body and the lever, and a fastening member penetrating the body, the lever, and the latch to hinge-couple the body, the lever, and the latch, wherein the body comprises a horizontal plate extending in one direction, a pair of vertical plates each provided in an upright form at both ends in the width direction of the horizontal plate, and a member formed on each of the pair of vertical plates extending along the length direction of the vertical plate. A partition characterized by comprising: a through hole that allows a fastening member to pass through and move; a rotation prevention projection provided in a form protruding from one inner surface of the vertical plate and positioned at the upper end of one side of the through hole to prevent rotation of the lever when the lever is not operated; a lever projection provided in a form protruding from the other side of the through hole to act as a lever for the lever that is tilted when the lever is operated; and a support projection extending from the other end of the horizontal plate on the side of the lever projection to support the tilted lever. Claim 2 A partition according to claim 1, wherein the main frame comprises a pair of vertical members extending in the vertical direction, an upper horizontal member extending in the left-right direction and coupled to the pair of vertical members by contacting the upper inner surface of the pair of vertical members, and a lower horizontal member extending in the left-right direction and coupled to the pair of vertical members by contacting the lower inner surface of the pair of vertical members, wherein the connecting device is provided at the lower end of the pair of vertical members in the longitudinal direction, and the clamp is fixed at both ends of the upper horizontal member in the longitudinal direction, with one end protruding in the direction of the vertical members. Claim 3 delete Claim 4 delete Claim 5 A partition according to claim 1, wherein the lever is provided to contact one inner surface of a pair of vertical plates and comprises a pair of fastening plates through which a fastening member passes at one end, a connecting plate that integrates the pair of fastening plates, and an operating plate that extends from the connecting plate and extends at a certain angle from the connecting plate to operate the lever. Claim 6 A partition according to claim 5, wherein the latch is provided long along the longitudinal direction of the body, with the fastening member penetrating one end thereof and movable in the longitudinal direction of the body by the operation of the lever, and a horizontal catch is provided at the other end of the movable block and extends in the width direction of the movable block to engage with a catch groove formed in another vertical member of the main frame or the partition column adjacent to it. Claim 7 A partition according to claim 6, wherein the vertical member is provided with a locking part on the other side corresponding to the one side in contact with the upper horizontal member, positioned at the bottom of the locking groove and bent in the inward direction of the vertical member, and the latch is provided with a vertical locking part that engages with the locking part, formed in an L-shape from one side of the horizontal locking projection toward the other end of the movable block. Claim 8 A partition according to claim 7, wherein the fastening member comprises a shaft that moves along the longitudinal direction of the through hole by penetrating the through hole, the fastening plate, and the movable block, and a finishing cap that is fastened to one end of the shaft to maintain the state in which the shaft has penetrated. Claim 9 A partition according to claim 2, wherein the connecting device comprises a base plate provided on the other side corresponding to the side in contact with the lower horizontal member of the vertical member, and a hook connected to the base plate and provided to be rotatable from the base plate, wherein the hook is fastened to another hook facing the same by rotating the hook provided on one of the pair of connecting devices facing each other. Claim 10 A partition according to claim 9, wherein the hook comprises a guide surface provided at one end, a loop groove extending from the guide surface and guided into and inserted into the guide surface provided on another hook facing it, a rotation axis connected to the base plate to allow the hook to rotate, and a stopper located at the other end corresponding to the guide surface to limit the rotation of the hook, and the base plate comprises a mounting space such that the hook is fastened to another hook facing it after rotating by the rotation axis. Claim 11 A partition according to claim 1, further comprising: an auxiliary frame provided in the inner space of the main frame to increase the structural rigidity of the main frame; a finishing panel provided in a plate shape to cover both sides of the main frame; a cover coupled to the top of the main frame to cover the top of the main frame; and a height adjustment device provided at the bottom of the main frame to adjust the height of the main frame.

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