Jack device

Abstract

When assembling and disassembling the scaffolding post, it is intended to further improve workability, reduce costs while reducing the risk of loss of the holding member by reducing the holding member, and further provide a jack device in which the lifting member and the scaffolding post do not come into contact with each other as the lifting member moves up and down. 【Solution means】In a jack device for raising and lowering a spliced post that supports a scaffold, a base portion on which the spliced post is placed, a column portion extending from the base portion in the raising and lowering direction, and the column portion are movable along the raising and lowering direction, and a lifting member configured to be able to protrude and retract in a direction intersecting the raising and lowering direction. The lifting member is characterized by including a claw portion that can be engaged with the spliced post.

Description

Technical Field

[0001] The present invention relates to a jack device for raising and lowering a spliced post that supports a scaffold used when assembling and disassembling scaffolds for maintenance, painting, construction, etc. of plants such as thermal power plants and buildings.

Background Art

[0002] Conventionally, scaffolds used for the above-described applications support the scaffold by vertically assembling spliced posts that support the scaffold, and various methods for assembling such spliced posts are known.

[0003] For example, in addition to lifting with a crane and assembling from below to above, an assembly / disassembly device described in Patent Document 1 is known.

[0004] The disassembly device described in Patent Document 1 is a scaffold post assembly / disassembly device that forms a scaffold post by vertically assembling a plurality of unit posts having a predetermined length with connection parts formed at both ends. It has a base for installing the unit post, a unit post lifting member for lifting and lowering the unit post, a holding member for detachably coupling the lifting member and the unit post, and a lifter for raising the lifting member higher than the height dimension of the unit post. The base, the lifter, and the lifting member form a substantially U-shaped unit post installation part. Inside the unit post installation part, the unit post is pulled up by the unit post lifting member, another unit post is positioned below it, and the two unit posts are joined. The holding of the lifted unit post and the lifting member is released by releasing the holding member. The lifting member is lowered to the initial state to hold the lower unit post with the lifting member, and this unit post is lifted in the same manner to assemble the scaffold post, and conversely, the scaffold post is disassembled.

[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 according to the present invention is a jack device for raising and lowering a spliced post that supports a scaffold. The jack device includes a base portion on which the spliced post is placed, a column portion extending from the base portion in the lifting direction, and a lifting member that is movable along the lifting direction of the column portion and is configured to be retractable in a direction intersecting the lifting direction. The lifting member includes a claw portion that can engage with the spliced post. , the column part is provided with a screw shaft for driving the lifting member, the lifting member is screwed to the screw shaft, and the lifting member includes a pair of lower hook parts in the shape of a long plate having the claw parts at the tips, and a pair of upper hook parts in the shape of a long plate pivotally assembled to the lower hook parts via a pivot. The opposite ends of the lower hook parts and the upper hook parts with respect to the pivot are pivotally assembled to the frame member, and further, the opposite ends of the upper hook parts are provided with a pair of hook parts assembled to be relatively movable with respect to the frame member along the lifting direction. It is characterized by the above.

[0014] Also, in the jack device according to the present invention , the It is preferable that a traveling nut member screwed onto the lead screw shaft is attached to the above. opposite ends of the upper hook parts It is preferable that the jack device according to the present invention includes a drive portion that applies a rotational force around the axis to the screw shaft.

[0015] Also, in the jack device according to the present invention, it is preferable that the pivot includes an imparting means for operating the hook portion.

[0016] Also, in the jack device according to the present invention, it is preferable that the pair of hook portions includes an air damper that maintains the pushed-in state.

[0017]

Advantages of the Invention

[0018] According to the jack device of the present invention, since it includes a lifting member that is movable along the lifting direction of the column portion and is configured to be retractable in a direction intersecting the lifting direction, and the lifting member includes a claw portion that can engage with the spliced post, the workability is further improved, and the lifting and lowering of the spliced post can be performed without the need for a separate member such as a pin. When the lifting member is lifted or lowered, the lifting member can be vertically stored on the column portion side, so that the lifting member and the spliced post do not come into contact with each other as the lifting member is lifted or lowered.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0020] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

[0021] FIG. 1 is a perspective view of a scaffold constructed using the jack device according to an embodiment of the present invention, FIG. 2 is a perspective view of the jack device according to an embodiment of the present invention, FIG. 3 is a perspective view for explaining the structure of the jack device according to an embodiment of the present invention, FIG. 4 is a front view for explaining the structure of the jack device according to an embodiment of the present invention, FIG. 5 is a side view for explaining the lifting member of the jack device according to an embodiment of the present invention, and FIG. 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, the jack device 10 according to this embodiment is used to install a spliced post on the scaffold 1 installed on the hopper part of the boiler furnace 4 and to form the scaffold 1 in multiple stages. In Fig. 1, nine stages of the scaffold 1 are provided, but the number of stages can be increased or decreased as required. Further, handrails 2, stairs 3 for moving between the stages, etc. are installed on the scaffold 1 as required. Such a scaffold 1 is assembled into an in-furnace inspection scaffold for boiler inspection work and renovation work, and is disassembled after the work.

[0023] As shown in Figs. 2 and 3, the jack device 10 according to this embodiment includes a base part 11, a column part 20 that stands upright from the base part 11 and extends in the vertical direction, and a lifting member 30 that is attached to be movable up and down along the extending direction of the column part 20. Note that since the lifting member 30 moves up and down along the extending direction of the column part 20, the lifting direction of the lifting member 30 is parallel to the extending direction of the column part 20.

[0024] The base part 11 has a placement part 13 for placing a spliced post (not shown) on the upper surface, and a plurality of leg parts 12 that protrude toward the device base 16 installed on the scaffold 1 as the installation surface of the jack device 10 according to this embodiment on the lower surface. The leg parts 12 are screwed to the base part 11, and their lengths are adjustable. By adjusting the lengths of the leg parts 12, it is possible to keep the installation state of the jack device 10 horizontal regardless of the situation of the scaffold 1.

[0025] Further, a support frame 14 that is attached to the column part 20 in an inclined manner is attached to the base part 11. The support frame 14 is composed of a pair of support frames 14 that are inclined in the left - right direction and a pair of support frames 14 that are inclined in the front - rear direction, and reinforces the column part 20 by supporting the column part 20 in the front, rear, left, and right directions.

[0026] The placement part 13 is formed at a position protruding forward of the column part 20 and is formed directly below the lifting member 30. A guide part 15 for positioning the extension post is formed on the placement part 13, and it is possible to restrict the extension post from moving inadvertently during the lifting operation described later. Note that the placement part 13 may be formed integrally with the base part 11 or may be configured separately.

[0027] The guide part 15 is a pair of plate-like members that stand vertically from the placement part 13 and have inclined surfaces that widen upward. By pressing the extension post from above and placing the extension post on the placement part 13, the extension post is positioned on the placement part 13.

[0028] As shown in FIGS. 3 and 4, the column part 20 includes a column main body 21 having an opening in which the lifting member 30 is assembled so as to be able to move up and down, and a screw shaft 22 rotatably assembled to the column main body 21. The screw shaft 22 is a columnar member having a spiral screw groove formed on its outer peripheral surface, and a traveling nut member 34 described later is assembled thereto. A bellows-like cover member 23 is attached to the outer periphery of the screw shaft 22 to protect the screw groove formed on the outer periphery of the screw shaft 22 from intrusion of foreign matter or the like and damage to the screw groove.

[0029] In addition to the support frame 14 described above being attached to the column main body 21, a hanging part 24 for hooking a wire or a hook when the jack device 10 according to the present embodiment is suspended by a crane or the like is attached above the column main body 21. A control part 40 is attached to the back surface of the column main body 21, and a control panel, a power source, etc. for performing drive control of the drive part 50 described later are housed therein.

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

[0031] As shown in FIGS. 3 to 5, the elevating member 30 includes a pair of hook portions including a lower hook portion 32 having a claw portion 31 with a substantially V-shaped groove formed at the tip, and an upper hook portion 33 pivotally assembled to the lower hook portion 32 via a pivot 38, and a frame member 35 for pivotally assembling the other end portions of the hook portions. That is, the lower hook portion 32 and the upper hook portion 33 are connected at their respective tip portions by a pivot 38, and the other end portions are pivotally assembled to the frame member 35 via a drive pin 37 and a fixing pin 37a.

[0032] The frame member 35 is composed of a steel plate or the like bent into a substantially U-shape in a cross section perpendicular to the elevating direction. Further, an upper wheel 51 and a lower wheel 52 are rotatably assembled to the side surface of the frame member 35, and the upper wheel 51 and the lower wheel 52 are arranged offset from each other in the front-rear direction so as to sandwich a guide rail 25 assembled to the column body 21 from the front and rear directions.

[0033] The frame member 35 is screwed to a screw shaft 22 of the column portion 20 and connected to a traveling nut member 34 accommodated in the frame member 35. The traveling nut member 34 is a substantially cylindrical member having an internal thread groove corresponding to the thread groove on the outer peripheral surface of the screw shaft 22, and is assembled so as to be movable in the elevating direction as the screw shaft 22 rotates. Note that the screw shaft 22 and the traveling nut member 34 may be configured as a rolling guide with a rolling body such as a ball or a roller interposed between the thread groove and the internal thread groove, or may be screwed in direct contact with each other's thread groove and internal thread groove to form a sliding guide.

[0034] An applying means 39 is attached to the pivot 38, and by pushing in the applying means 39, the hook portion composed of the lower hook portion 32 and the upper hook portion 33 can be pushed in so as to be in a straight line in the vertical direction.

[0035] Further, the drive pin 37 is assembled to a long hole 36 formed at the upper end of the frame member 35. The long hole 36 is a long hole extending in the vertical direction, and is configured such 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 vertical direction.

[0036] Also, the drive pin 37 is pushed into the upper side of the long 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 long hole 36.

[0037] With such a configuration, as shown in FIG. 5, the lifting member 30 has a state in which the hook portion composed of the lower hook portion 32 and the upper hook portion 33 is bent in a "く" shape and protrudes from the frame member 35 of the lifting member 30, and as shown by the dotted line, the applying means 39 is pushed in to move the drive pin 37 upward along the long hole 36, and by moving the other end side of the upper hook portion 33 upward, the hook portion can be deformed into a stored state in a straight line parallel to the frame member 35.

[0038] Note that a connecting line C connecting the center of the drive pin 37 when the drive pin 37 moves to the upper side of the long hole 36 and the center of the fixed pin 37a is inclined with respect to a vertical line V extending vertically from the center of the drive pin 37, and the connecting line C is located on the left side of the vertical line V, and in this state, the drive pin 37 is maintained in a state of being pushed into the upper side of the long hole 36 by the air damper 30a.

[0039] That is, the pair of hook portions composed of the lower hook portion 32 and the upper hook portion 33 are configured to be able to protrude and retract in a direction intersecting the vertical direction by the pushing and pulling operation of the applying means 39.

[0040] Also, as shown in FIGS. 3 and 4, a drive portion 50 is attached to the lower end of the screw shaft 22 so as to be housed in the base portion 11, and the screw shaft 22 is rotatably attached in the column portion 20 by the drive portion 50 in the circumferential direction. It is preferable that 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 speed reducer (not shown), and the servo motor is controlled to rotate by receiving power and a drive command from the control unit 40.

[0042] Since the drive unit 50 rotates the screw shaft 22, the lifting member 30 having the traveling nut member 34 screwed onto the screw shaft 22 can move up and down along the lifting direction as the drive unit 50 rotates forward and backward. Since the traveling nut member 34 is held within the frame member 35, the lifting member 30 can be lifted and lowered in either the state where the pair of hook portions are in a "く" shape or the stored state.

[0043] Next, with reference to FIG. 6, the operation of the jack device 10 according to the present embodiment will be described. First, as shown in (a), with the lower hook portion 32 and the upper hook portion 33 of the jack device 10 according to the present embodiment in the stored state and the lifting member 30 moved to the lower side of the column portion 20, the spliced post 5 is placed on the placement portion 13. The spliced post 5 has engaging portions 6 formed on opposite side surfaces, and the engaging portions 6 are formed such that the V-grooved 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 to deform the lower hook portion 32 and the upper hook portion 33, which were in the stored state, into a "く" shape. At this time, the claw portion 31 formed at the tip of the lower hook portion 32 is arranged so as to support the engaging portion 6 of the spliced post 5 from below.

[0045] Further, as shown in (c), the driving unit 50 is driven to rotate the screw shaft 22, thereby moving the lifting member 30 upward on the column portion 20. At this time, the claw portion 31 engages with the engaging portion 6 of the spliced post 5, and the spliced post 5 moves upward together with the lifting member 30. Thereafter, another spliced post 5 is added and fixed to the lower end of the lifted spliced post 5.

[0046] Next, as shown in (d), the driving 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 added spliced post 5 is placed on the placement portion 13.

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

[0048] Next, as shown in (f), by operating the applying means 39 of the lifting member 30, the traveling nut member 34 is rotated to deform the lower hook portion 32 and the upper hook portion 33 into a stored state. In this state, the lifting member 30 is lowered to the position of (a). By repeating the steps from (a) to (f), the spliced post 5 can be assembled to an arbitrary number of stages.

[0049] As described above, according to the jack device 10 according to the present embodiment, since the engagement between the spliced post 5 and the claw portion 31 is engaged so that the claw portion 31 supports from below the engaging portion 6, the pin-shaped holding member used in the past becomes unnecessary, the work efficiency is improved at each stage, and it is possible to reduce the cost while reducing the risk such as loss of the holding member by reducing such a holding member.

[0050] Also, as shown in FIG. 6(f), after the splicing operation of the spliced post 5 is completed, the lower hook portion 32 and the upper hook portion 33 can be brought into a stored state, so that the claw portion 31 and the spliced post 5 do not contact each other when the lifting member 30 moves up and down.

[0051] In the jack device 10 according to the above-described embodiment, the case where the claw portion 31 is formed in a V-groove shape and the spliced post 5 has a V-shaped engaging portion 6 corresponding to the shape of the claw portion 31 has been described. However, as long as the claw portion 31 can support from below, the shape of the engaging portion 6 can adopt various protruding shapes such as a pin shape. It is clear from the description of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0052] 1 Scaffold, 2 Handrail, 3 Stairs, 4 Boiler Furnace, 10 Jack Device, 11 Base Portion, 12 Leg Portion, 13 Mounting Portion, 14 Support Frame, 15 Guide Portion, 16 Device Base, 20 Column Portion, 21 Column Portion Body, 22 Screw Shaft, 23 Cover Member, 24 Suspension Portion, 25 Guide Rail, 30 Lifting Member, 31 Claw Portion, 32 Lower Hook Portion, 33 Upper Hook Portion, 34 Traveling Nut Member, 35 Frame Member, 36 Long Hole, 37 Driving Pin, 37a Fixed Pin, 38 Pivot, 39 Applying Means, 40 Control Portion, 50 Driving Portion, 51 Upper Wheel, 52 Lower Wheel.

Claims

1. In a jack device for raising and lowering a spliced post that supports a scaffold, a base portion on which the spliced post is placed, a column portion extending in the raising and lowering direction from the base portion, a lifting member that is movable along the raising and lowering direction of the column portion and is configured to be retractable and extendable in a direction intersecting the raising and lowering direction, the lifting member includes a claw portion engageable with the spliced post, the column portion includes a screw shaft for driving the lifting member, the lifting member is screwed onto the screw shaft, the lifting member is composed of a pair of lower hook portions in the shape of a long plate having the claw portion at the tip, and a pair of upper hook portions in the shape of a long plate pivotally assembled to the lower hook portions via a pivot, and opposite ends of the lower hook portions and the upper hook portions with respect to the pivot are pivotally assembled to a frame member, and further opposite ends of the upper hook portions are assembled to the frame member so as to be relatively movable along the raising and lowering direction, and the jack device is characterized by including a pair of hook portions.

2. In the jack device according to claim 1, a traveling nut member screwed onto the screw shaft is attached to the opposite end of the upper hook portion, and the jack device is characterized by this.

3. In the jack device according to claim 1, the jack device is characterized by including a drive portion for applying a rotational force around the axis to the screw shaft.

4. In the jack device according to claim 1, the pivot includes an imparting means for operating the hook portion, and the jack device is characterized by this.

5. In the jack device according to claim 1, the pair of hook portions includes an air damper for maintaining the pushed-in state, and the jack device is characterized by this.

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