Jack device

Abstract

To provide a jack device capable of further improving workability in assembling and disassembling a scaffold post, reducing cost while reducing a risk of loss of a holding member by reducing a holding member, and preventing contact between a lifting member and a scaffold post when the lifting member is lifted and lowered.SOLUTION: A jack device for raising and lowering an extension post supporting a scaffold includes a base part on which the extension post is placed, a column part extending from the base part in a raising and lowering direction, and a raising and lowering member configured to be movable along the raising and lowering direction of the column part and to be retractable in a direction intersecting the raising and lowering direction, in which the raising and lowering member includes a claw portion engageable with the extension post.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a jack device for raising and lowering an extension post that supports scaffolding used when assembling and dismantling scaffolding for maintenance of plants and buildings such as thermal power plants, as well as painting and construction work. [Background technology]

[0002] Conventionally, scaffolding used for the above-mentioned purposes is supported by vertically assembling extension posts that support the scaffolding, and various methods for assembling such extension posts are known.

[0003] For example, a crane is used to lift the structure and assemble it from below upward, and an assembly / disassembly device as described in Patent Document 1 is also known.

[0004] The dismantling device described in Patent Document 1 is a scaffolding post assembly and dismantling device that forms a scaffolding post by vertically assembling a plurality of unit posts of a predetermined length with connection parts formed at both ends, and has a base for installing the unit posts, a unit post lifting member for raising and lowering the unit posts, a holding member for detachably connecting the lifting member and the unit posts, and an elevator for raising the lifting member higher than the height dimension of the unit posts, and is characterized in that the base, the elevator and the lifting member form an approximately U-shaped unit post installation section, in which a unit post is lifted up within the unit post installation section by the unit post lifting member, another unit post is positioned below it and both unit posts are joined, the lifted unit post and the lifting member are released by releasing the holding member, the lifting member is lowered to its initial state and the lower unit post is held by the lifting member, and this unit post is raised in the same manner as above to assemble a scaffolding post, and the scaffolding post is dismantled in the reverse manner.

[0005] With this type of dismantling device, unit posts having connection parts at both ends and a predetermined length are raised and lowered within an approximately C-shaped unit post installation section with a longer height dimension to assemble the scaffolding post vertically, and then reversed to dismantle the scaffolding post.This not only makes the assembly and dismantling of unit posts safe and easy to work with, but also means that in addition to using the scaffolding post assembly and dismantling device, the unit posts can be raised and lowered to assemble and dismantle vertically in a specific, limited location, such as the post installation section, and work can be carried out safely, efficiently, and reliably even in outdoor locations, just like assembly and dismantling work in a factory. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 5-46424 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the scaffolding post assembly and disassembly device described in Patent Document 1, the unit post is attached to the lifting member using a pin-shaped holding member that connects the lifting member and the unit post in a detachable manner, which requires the work of attaching and detaching the holding member.In addition to the need for further efficiency in workability, there is also the problem of needing to align the holes in the holding member and the post.

[0008] In addition, as the lifting member rises and falls, there is a possibility that the lifting member may interfere with the scaffolding post placed on the platform, and it has been pointed out that there is a possibility of damage to the scaffolding post or the jack device.

[0009] The present invention has been made in consideration of the above circumstances, and aims to provide a jack device that further improves workability when assembling and dismantling scaffolding posts, reduces the number of connecting pins to reduce the risk of losing the pins and thereby reduce costs, and prevents contact between the lifting member and the scaffolding post as the lifting member is raised and lowered. [Means for solving the problem]

[0010] The jack device of the present invention is a jack device that raises and lowers an extension post that supports scaffolding, and is characterized in that it comprises a base portion on which the extension post is placed, a pillar portion extending from the base portion in the lifting and lowering direction, and a lifting member that is movable along the lifting and lowering direction of the pillar portion and is configured to be able to freely appear and disappear in a direction intersecting the lifting and lowering direction, and the lifting member has a claw portion that can engage with the extension post.

[0011] In the jack device according to the present invention, it is preferable that the pillar portion includes a screw shaft that drives the lifting member, and the lifting member is screwed onto the screw shaft.

[0012] In the jack device according to the present invention, it is preferable that the lifting member has a pair of hook portions whose tip ends are pivotally connected to each other via a pivot shaft and whose other end is pivotally attached to the pair of hook portions.

[0013] In the jack device according to the present invention, it is preferable that the claw portion is formed at a tip end of at least one of the pair of hook portions.

[0014] In the jack device according to the present invention, it is preferable that a traveling nut member that screws onto the screw shaft is attached to the other end of the hook portion.

[0015] In addition, the jack device according to the present invention preferably includes a drive unit that applies a rotational force to the screw shaft around the axis.

[0016] In the jack device according to the present invention, it is preferable that the pivot shaft includes an applying means for operating the hook portion.

[0017] In the jack device according to the present invention, it is preferable that the pair of hook portions include air dampers that maintain the pressed-in state. [Effects of the Invention]

[0018] According to the jack device of the present invention, a lifting member is provided that is movable along the lifting and lowering direction of the pillar portion and is configured to be able to protrude and retract in a direction intersecting the lifting and lowering direction, and the lifting member is provided with a claw portion that can engage with the extension post, thereby improving workability and allowing the extension post to be raised and lowered without the need for a separate member such as a pin.When the lifting member is raised and lowered, it can be stored vertically on the pillar portion side, so there is no contact between the lifting member and the extension post as the lifting member is raised and lowered. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of a scaffold constructed using a jack apparatus according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of a jack device according to an embodiment of the present invention; [Figure 3] 1 is a perspective view illustrating a structure of a jack device according to an embodiment of the present invention; [Figure 4] 1 is a front view illustrating a structure of a jack device according to an embodiment of the present invention. [Figure 5] FIG. 2 is a side view illustrating a lifting member of the jack device according to the embodiment of the present invention. [Figure 6] 5A to 5C are diagrams illustrating the operation of the jack device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0021] Figure 1 is an oblique view of a scaffolding constructed using a jack device according to an embodiment of the present invention, Figure 2 is an oblique view of the jack device according to an embodiment of the present invention, Figure 3 is an oblique view for explaining the structure of the jack device according to an embodiment of the present invention, Figure 4 is a front view for explaining the structure of the jack device according to an embodiment of the present invention, Figure 5 is a side view for explaining the lifting member of the jack device according to an embodiment of the present invention, and Figure 6 is a diagram for explaining the operation of the jack device according to an embodiment of the present invention.

[0022] As shown in FIG. 1, a jacking device 10 according to this embodiment is used to set up extension posts on scaffolding 1 installed in the hopper section of a boiler furnace 4, thereby forming the scaffolding 1 into multiple stages. In FIG. 1, the scaffolding 1 has nine stages, but the number of stages can be increased or decreased as needed. In addition, handrails 2 and stairs 3 for moving between stages are installed on the scaffolding 1 as needed. Such scaffolding 1 is used to assemble an in-furnace inspection scaffold for boiler inspection work and modification work, and then dismantle it after the work is complete.

[0023] 2 and 3, the jack device 10 according to this embodiment includes a base 11, a column 20 that stands upright from the base 11 and extends vertically, and a lifting member 30 that is attached so as to be able to rise and fall along the extension direction of the column 20. Note that the lifting member 30 rises and falls along the extension direction of the column 20, and therefore the lifting direction of the lifting member 30 is parallel to the extension direction of the column 20.

[0024] The base 11 has a mounting portion 13 on its upper surface for mounting an extension post (not shown), and a plurality of legs 12 on its lower surface that protrude toward a device base 16 that is installed on the scaffolding 1 as an installation surface for the jack device 10 according to this embodiment. The legs 12 are screwed to the base 11, and their lengths are adjustable. By adjusting the length of the legs 12, it is possible to keep the installed state of the jack device 10 horizontal regardless of the condition of the scaffolding 1.

[0025] In addition, support frames 14 are attached to the base 11 at an angle relative to the pillars 20. The support frames 14 are made up of a pair of support frames 14 inclined in the left-right direction and a pair of support frames 14 inclined in the front-rear direction, and by supporting the pillars 20 in the front-rear and left-right directions, they reinforce the pillars 20.

[0026] The mounting portion 13 is formed at a position that protrudes forward from the column portion 20, and is formed directly below the lifting member 30. The mounting portion 13 is formed with a guide portion 15 that positions the extendable post, and is capable of restricting the extendable post from moving inadvertently during the lifting operation described below. The mounting portion 13 may be formed integrally with the base portion 11, or may be configured as a separate body.

[0027] The guide section 15 is a pair of plate-like members that stand vertically from the mounting section 13 and have slopes that widen upward.The guide section 15 positions the extension post on the mounting section 13 by pressing the extension post from above and placing the extension post on the mounting section 13.

[0028] 3 and 4, the column 20 includes a column body 21 having an opening to which the lifting member 30 can be attached so as to be movable up and down, and a screw shaft 22 rotatably attached to the column body 21. The screw shaft 22 is a cylindrical member with a helical thread groove formed on its outer circumferential surface, and a traveling nut member 34 (described later) is attached to it. A bellows-shaped cover member 23 is attached to the outer periphery of the screw shaft 22 to protect the thread groove formed on the outer periphery of the screw shaft 22 from intrusion of foreign matter and damage.

[0029] The pillar body 21 has the support frame 14 attached thereto, and also has a hanging part 24 attached above the pillar body 21 to which a wire or hook is attached when suspending the jack device 10 according to this embodiment with a crane or the like. Also, a control part 40 is attached to the back of the pillar body 21, and houses a control panel, power supply, etc. for controlling the drive of the drive part 50 (described later).

[0030] Furthermore, a guide rail 25 is attached along the lifting direction to the inner wall surface of the column main body 21. It is preferable that a pair of guide rails 25 are provided corresponding to both side surfaces of the lifting member 30.

[0031] 3 to 5, the lifting member 30 includes a pair of hook portions, each of which is composed of a lower hook portion 32 having a claw portion 31 with a substantially V-shaped groove formed at its tip, and an upper hook portion 33 pivotally attached to the lower hook portion 32 via a pivot 38, and a frame member 35 to which the other end portions of the hook portions are pivotally attached. That is, the tips of the lower hook portion 32 and the upper hook portion 33 are connected by the pivot 38, and the other end portions are pivotally attached to the frame member 35 via a drive pin 37 and a fixing pin 37a.

[0032] The frame member 35 is made of a steel plate or the like bent into a roughly U-shape in a cross section perpendicular to the lifting direction. Upper wheels 51 and lower wheels 52 are rotatably mounted on the side of the frame member 35, and the upper wheels 51 and lower wheels 52 are offset from each other in the front-to-rear direction so as to sandwich the guide rail 25 mounted on the column main body 21 from the front-to-rear direction.

[0033] The frame member 35 is threadedly engaged with the screw shaft 22 of the column portion 20 and is connected to a traveling nut member 34 housed in the frame member 35. The traveling nut member 34 is a roughly cylindrical member on which an internal thread groove corresponding to the thread groove on the outer peripheral surface of the screw shaft 22 is formed, and the traveling nut member 34 is assembled so as to be movable in the ascending and descending direction as the screw shaft 22 rotates. The screw shaft 22 and the traveling nut member 34 may be configured as rolling guides by interposing rolling elements such as balls or rollers between the screw groove and the internal thread groove, or may be configured as sliding guides by directly contacting and threading the screw groove and internal thread groove of each other.

[0034] An attachment means 39 is attached to the pivot 38, and by pushing the attachment means 39, the hook portion consisting of the lower hook portion 32 and the upper hook portion 33 can be pushed in so as to be aligned vertically.

[0035] Further, the drive pin 37 is assembled in a long hole 36 formed at the upper end of the frame member 35. The long hole 36 is long in the lifting direction, and is configured so that when the hook portion is pushed in, the position of the drive pin 37 at the other end of the upper hook portion 33 can be moved along the lifting direction.

[0036] In addition, the drive pin 37 is pushed into the upper side of the elongated hole 36 by the air damper 30a, and the pushing force of the air damper 30a can be released by moving the drive pin 37 to the lower side of the elongated hole 36.

[0037] By configuring the lifting member 30 in this manner, as shown in Figure 5, the hook portion consisting of the lower hook portion 32 and the upper hook portion 33 can be bent into a ``L'' shape and protrude from the frame member 35 of the lifting member 30, or it can be deformed into a stored state in which the hook portion is in a straight line parallel to the frame member 35 by pushing in the application means 39 as shown by the dotted line, moving the drive pin 37 upward along the elongated hole 36, and moving the other end of the upper hook portion 33 upward.

[0038] When the drive pin 37 moves to the upper side of the elongated hole 36, the connecting line C connecting the center of the drive pin 37 and the center of the fixed pin 37a is inclined with respect to the vertical line V extending perpendicularly from the center of the drive pin 37, and the connecting line C is located to the left of the vertical line V. In this state, the drive pin 37 is kept pressed into the upper side of the elongated hole 36 by the air damper 30a.

[0039] That is, the pair of hook portions consisting of the lower hook portion 32 and the upper hook portion 33 are configured to be able to freely appear and disappear in a direction intersecting the ascending and descending direction by pushing and pulling the application means 39 .

[0040] 3 and 4, a drive unit 50 is attached to the lower end of the screw shaft 22 so as to be housed in the base 11, and the screw shaft 22 is attached so as to be rotatable in the circumferential direction by the drive unit 50 within the column 20. Preferably, the upper and lower ends of the screw shaft 22 are supported by bearings (not shown) or the like.

[0041] The drive unit 50 has a servo motor attached to the screw shaft 22 via a planetary reducer or the like (not shown), and the servo motor is controlled to rotate by receiving power and drive commands from the control unit 40.

[0042] The drive unit 50 rotates the screw shaft 22, and the lifting member 30, which has the traveling nut member 34 threaded onto the screw shaft 22, can move up and down in the lifting direction as the drive unit 50 rotates forward and backward. Note that because the traveling nut member 34 is held within the frame member 35, the lifting member 30 can be raised and lowered whether the pair of hooks are in the dogleg position or the stored position.

[0043] Next, the operation of the jack device 10 according to this embodiment will be described with reference to Fig. 6. First, as shown in Fig. 6(a), the lower hook portion 32 and the upper hook portion 33 of the jack device 10 according to this embodiment are stored, and the lifting member 30 is moved to the lower side of the column portion 20, and the extension post 5 is placed on the placement portion 13. The extension post 5 has engagement portions 6 formed on opposing side surfaces, and the engagement portions 6 are formed so that the V-groove-shaped claw portion 31 formed at the tip of the lower hook portion 32 can engage from below.

[0044] Next, as shown in (b), the applying means 39 of the lifting member 30 is operated to move the traveling nut member 34 downward, thereby deforming the lower hook portion 32 and the upper hook portion 33, which were in the stored state, into a "L" shape. At this time, the claw portion 31 formed at the tip of the lower hook portion 32 is positioned so as to support the engaging portion 6 of the extension post 5 from below.

[0045] Furthermore, as shown in (c), the drive unit 50 is driven to rotate the screw shaft 22, thereby moving the lifting member 30 upward above the column 20. At this time, the claws 31 engage with the engaging portions 6 of the extension post 5, causing the extension post 5 to move upward together with the lifting member 30. After that, another extension post 5 is added to the lower end of the lifted extension post 5 and fixed.

[0046] Next, as shown in (d), the drive unit 50 is driven to rotate the screw shaft 22 so as to lower the lifting member 30, and the lifting member 30 is lowered until the extended extension post 5 is placed on the mounting portion 13.

[0047] Furthermore, when the lifting member 30 is lowered, as shown in (e), the engagement between the engagement portion 6 of the extension post 5 and the claw portion 31 is released, and the extension post 5 is placed on the placement portion 13 together with the extension post 5.

[0048] Next, as shown in (f), the applying means 39 of the lifting member 30 is operated to rotate the traveling nut member 34, causing the lower hook portion 32 and the upper hook portion 33 to deform into the stored state. In this state, the lifting member 30 is lowered to the position shown in (a). By repeating steps (a) to (f), it is possible to assemble the extension post 5 to any number of stages.

[0049] Thus, according to the jack device 10 of this embodiment, the engagement between the extension post 5 and the claw portion 31 is such that the claw portion 31 supports the engagement between the extension post 5 and the engagement portion 6 from the underside thereof, thereby eliminating the need for the pin-shaped retaining member that was previously used, thereby significantly improving work efficiency and enabling costs to be reduced while reducing the risk of losing such retaining members by eliminating the need for such retaining members.

[0050] Furthermore, as shown in Figure 6(f), after the extension work of the extension post 5 is completed, the lower hook portion 32 and the upper hook portion 33 can be stored, so that the claw portion 31 and the extension post 5 do not come into contact when the lifting member 30 is raised or lowered.

[0051] In the jack device 10 according to the above embodiment, the claws 31 are formed in a V-groove shape, and the extension post 5 has a V-shaped engaging portion 6 corresponding to the shape of the claws 31. However, the engaging portion 6 can have various protruding shapes, such as a pin shape, as long as it can support the claws 31 from below. It is clear from the claims that such modified or improved forms are also included within the technical scope of the present invention. [Explanation of symbols]

[0052] 1 Scaffolding, 2 Handrail, 3 Stairs, 4 Boiler furnace, 10 Jack device, 11 Base, 12 Leg, 13 Placement part, 14 Support frame, 15 Guide part, 16 Device base, 20 Column part, 21 Column body, 22 Screw shaft, 23 Cover member, 24 Hanging part, 25 Guide rail, 30 Lifting member, 31 Claw part, 32 Lower hook part, 33 Upper hook part, 34 Traveling nut member, 35 Frame member, 36 Slot, 37 Drive pin, 37a Fixing pin, 38 Pivot, 39 Applying means, 40 Control part, 50 Drive part, 51 Upper wheel, 52 Lower wheel.

Claims

1. In a jack device for raising and lowering an extension post that supports scaffolding, a base portion on which the extension post is placed; a column portion extending from the base portion in the lifting direction; a lifting member that is movable along the lifting direction of the column portion and is configured to be able to appear and disappear in a direction intersecting the lifting direction, A jack device characterized in that the lifting member has a claw portion that can engage with the extension post.

2. The jack device according to claim 1, The column portion includes a screw shaft that drives the lifting member, The lifting member is threadedly engaged with the screw shaft.

3. The jack device according to claim 2, The lifting member has a pair of hook portions pivotally connected at its tip end via a pivot shaft and pivotably attached at its other end.

4. The jack device according to claim 3, The jack device is characterized in that the claw portion is formed at the tip of at least one of the pair of hook portions.

5. The jack device according to claim 3, A jack device characterized in that a traveling nut member that threads onto the screw shaft is attached to the other end of the hook portion.

6. The jack device according to claim 2, A jack device characterized by comprising a drive unit that applies a rotational force to the screw shaft around the axis.

7. The jack device according to claim 3, The pivot shaft is provided with an applying means for operating the hook portion.

8. The jack device according to claim 3, A jack device characterized in that the pair of hook portions are equipped with air dampers that maintain the pressed-in state.

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