Work assistance tool

Abstract

To perform ceiling board alignment reliably and easily.SOLUTION: A work assistance tool 1 has a leg 2 having wheels 22, a post 3 supported by the leg 2 and extendable along a vertical direction, and a receiving portion 5 rotatably attached to an upper end of the post 3 to tilt back and forth to place a ceiling board 6, and a dimension L1 from an upper end of the receiving portion 5 to a rotary fulcrum position 56 is smaller than a dimension L2 from a lower end of the receiving portion 5 to the rotary fulcrum position 56.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tool suitable for use when attaching a ceiling board to a ceiling substrate. [Background technology]

[0002] A known conventional tool used when attaching ceiling boards to the ceiling substructure of a building is a ceiling board attachment assistant that includes a self-supporting support post with an extension mechanism and a board support part that can be detachably attached to the top of the support post (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-328895 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when attaching a ceiling board to a ceiling substrate, it is necessary to precisely align the edges of a specified area to be covered by the ceiling board, and also the edges of the ceiling board that has already been attached, without any gaps. However, the auxiliary machine described in Patent Document 1 has the problem that, although it can lift the ceiling board, it cannot reliably and easily align the ceiling board.

[0005] Therefore, in one aspect, the present invention has an object to provide a technique that enables reliable and easy alignment of ceiling boards. [Means for solving the problem]

[0006] In order to solve the above problems, the work support device of the present invention may have a leg having wheels, a support column supported by the leg and extendable in the vertical direction, and a receiving section attached to the upper end of the support column so as to be rotatable so as to tilt forward and backward and on which a ceiling board is placed, wherein the dimension from the upper end of the receiving section to the pivot point position is smaller than the dimension from the lower end of the receiving section to the pivot point position.

[0007] The work auxiliary tool according to the present invention may be configured such that a ratio of a longitudinal dimension L of the receiving portion to a longitudinal dimension H of the ceiling board (ie, L / H) is 2 / 3 or more and less than 1.

[0008] The work auxiliary tool according to the present invention may be configured such that the ratio of a dimension L1 from the upper end of the receiving portion to the position of the pivot point to the longitudinal dimension L of the receiving portion (i.e., L1 / L) is 1 / 7 or more and 1 / 3 or less.

[0009] In the work auxiliary tool according to the present invention, the receiving portion may have a longitudinal dimension of 1450 to 1550 mm, and the dimension from the upper end of the receiving portion to the position of the rotation fulcrum may be 290 to 310 mm. Effect of the Invention

[0010] According to the present invention, in one aspect, it becomes possible to reliably and easily align the ceiling board. [Brief description of the drawings]

[0011] [Figure 1] 1 is a side view showing an outline of an overall configuration of a work auxiliary tool according to an embodiment of the present invention; [Diagram 2] 1 is a front view showing a rotation mechanism and a receiving portion of a work support tool according to an embodiment of the present invention. FIG. [Diagram 3] 4 is a diagram showing the operation of the work support tool of FIG. 1 when in use, showing a state in which a ceiling board is placed on the receiving portion. FIG. [Figure 4]4 is a diagram showing a state in which the upper edge of the ceiling board is abutted against a predetermined corner and aligned, following the state shown in FIG. 3. FIG. [Diagram 5] 5 is a diagram showing the state after the state shown in FIG. 4 in which the ceiling board is placed in a horizontal position and pressed against the ceiling substrate. [Figure 6] 2 is a diagram for explaining the dimensional relationship related to a receiving portion of the work support tool in FIG. 1. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0013] In the description of the present invention, as shown in each figure, the up-down direction is defined along each axis of a three-dimensional orthogonal coordinate system, and upward and downward directions are defined according to the direction of each arrow, the front-rear direction is defined, and forward and backward directions are defined according to the direction of each arrow, and the left-right direction is defined, and right and left directions are defined according to the direction of each arrow. The front-rear direction and the left-right direction are mutually orthogonal within the same plane (specifically, the horizontal plane), and the up-down direction is mutually orthogonal to the front-rear direction and the left-right direction. A line of sight from the front along the front-rear direction is a front view, a line of sight from the left-right direction is a side view, and a line of sight from above along the up-down direction is a plan view.

[0014] (Overall composition) Fig. 1 is a side view showing an outline of the overall configuration of a work support tool 1 according to an embodiment, as an example of a specific configuration mode of the work support tool according to the present invention. Fig. 2 is a front view showing a rotation mechanism 4 and a receiving portion 5 of the work support tool 1 according to the embodiment.

[0015] The work support device 1 in the embodiment has a leg 2 having wheels 22, a support column 3 supported by the leg 2 and extendable in the vertical direction, and a receiving section 5 attached to the upper end of the support column 3 so as to be rotatable so as to tilt forward and backward and on which a ceiling board 6 is placed, wherein a dimension L1 from the upper end of the receiving section 5 to a pivot point position 56 is smaller than a dimension L2 from the lower end of the receiving section 5 to the pivot point position 56.

[0016] The work support device 1 has a leg portion 2, a support portion 3, a rotating mechanism 4, and a receiving portion 5.

[0017] The leg 2 has a plurality of legs 21 extending radially from a first strut support part 23 located at the center in a plan view of the leg 2, and wheels 22 attached to the lower end of each of the plurality of legs 21. Each of the plurality of legs 21 is formed in a curved shape from the horizontal direction of the base end part fixed to the first strut support part 23 to the vertical direction of the tip part.

[0018] The legs 21 are three, arranged at intervals of 120° in plan view. However, the number of legs 21 is not limited to three, and may be four or more. The horizontal extension dimension of each of the legs 21 in plan view is appropriately set to an appropriate dimension, taking into consideration that the independence of the work support tool 1 in a state where the ceiling board 6 is held can be stably ensured.

[0019] The wheels 22 are attached to the lower end of each of the multiple legs 21 so that the legs 2 can run horizontally relative to the floor surface on which the legs 2 are placed, thereby facilitating movement of the work auxiliary tool 1.

[0020] The wheels 22 are preferably casters that can rotate horizontally around an axis along the vertical direction as a rotation axis. The wheels 22 are also preferably equipped with a stopper (in other words, a brake) that can fix the rotation of the wheels or release the fixation of the wheels.

[0021] In the example shown in the figure, a caster with a stopper that can rotate horizontally is attached to the lower end of each of the three legs 21.

[0022] The base end of each of the multiple legs 21 is fixed to a side surface of the first pillar support portion 23.

[0023] A second pillar support part 24 and a pillar receiver 25 are provided below the first pillar support part 23. The second pillar support part 24 is supported and fixed below the first pillar support part 23 by fixing rods between the second pillar support part 24 and each of the multiple legs 21. The pillar receiver 25 is fixedly attached to the lower end of the second pillar support part 24.

[0024] A through hole that penetrates along the up-down direction is formed in each of the first column support part 23 and the second column support part 24. The through hole of the first column support part 23 and the through hole of the second column support part 24 are formed so as to be coaxial with each other along the up-down direction. A hole that communicates with the through hole of the second column support part 24, runs along the up-down direction, and has a closed lower end (in other words, is blocked) is formed in the column receiving part 25.

[0025] The lower end of the pillar part 3 is inserted through the upper opening of the through hole that runs along the vertical direction of the first pillar support part 23, so that the pillar part 3 penetrates through the first pillar support part 23 and the second pillar support part 24 and the lower end portion of the pillar part 3 enters the pillar receiving part 25.When the lower end of the pillar part 3 abuts the lower end (in other words, the bottom surface) of the pillar receiving part 25, the pillar part 3 is supported and held by the leg 2 in a position where the axial direction of the pillar part 3 runs along the vertical direction.

[0026] At least one of the first column support part 23 and the second column support part 24 may be provided with, for example, a tightening mechanism (not shown) for fixing the column part 3 in a state in which the column part 3 is supported and held. As the tightening mechanism, for example, a mechanism for tightening the circumferential surface of the column body by reducing the diameter of an annular member that surrounds the periphery of the column body in the horizontal direction may be used.

[0027] The support column 3 is configured as an expandable columnar body. Specifically, the support column 3 has an outer tube 31 and an inner lift rod 32 that is fitted into the outer tube 31 and extends and retracts (in other words, protrudes and retracts) from the upper end of the outer tube 31. In other words, the support column 3 is configured to be expandable and retractable in the up-down direction.

[0028] The longitudinal dimension (i.e., the vertical direction) of the support portion 3 is not limited to a specific value, but may be set, for example, to any value in the range of approximately 1600 mm to 2000 mm when it is most shortened, and to any value in the range of approximately 2400 mm to 3400 mm when it is most extended.

[0029] An extension / retraction adjustment mechanism 33 is provided between the outer cylinder 31 and the lifting inner rod 32. The extension / retraction adjustment mechanism 33 is a mechanism that adjusts the degree of extension / retraction of the lifting inner rod 32 relative to the outer cylinder 31 and fixes the positional relationship between the outer cylinder 31 and the lifting inner rod 32 in the adjusted state.

[0030] The specific configuration of the telescopic adjustment mechanism 33 is not limited to a specific mechanism, but may be configured to include, for example, a handle-type elevator mechanism.

[0031] The handle type elevator mechanism may be configured, for example, as a mechanism in which a spur gear (not shown) is connected to a rotatable handle 331 provided on the outer cylinder 31, and a rack that meshes with the spur gear is provided on the outer circumferential surface of the inner lift rod 32 along the axial direction of the inner lift rod 32. Then, when the handle 331 provided on the outer cylinder 31 is turned, the spur gear rotates, and the degree of extension / retraction of the inner lift rod 32 with respect to the outer cylinder 31 may be changed (in other words, adjusted) through the meshing of the spur gear with the rack provided on the inner lift rod 32.

[0032] In the example shown in the figure, turning the rotary handle 331 in one direction causes the lifting inner rod 32 to extend outward relative to the outer tube 31, and turning the handle 331 in the other direction causes the lifting inner rod 32 to retract into the outer tube 31.

[0033] The telescopic adjustment mechanism 33 may be configured so that when operation of the telescopic adjustment mechanism 33 is stopped (e.g., turning the handle 331 is stopped) when the extension / retraction of the lifting inner rod 32 relative to the outer tube 31 reaches the desired degree, the state in which the lifting / retracting of the lifting inner rod 32 relative to the outer tube 31 has stopped (in other words, a state in which the degree of extension / retraction of the lifting inner rod 32 relative to the outer tube 31 is fixed) is maintained.

[0034] The telescopic adjustment mechanism 33 may alternatively be configured to include a locking mechanism which fixes the position of the lifting inner rod 32 relative to the outer tube 31 (in other words, the degree of extension / retraction of the lifting inner rod 32 relative to the outer tube 31) when the lifting inner rod 32 is extended / retracted to the desired degree relative to the outer tube 31, or which releases the fixed position of the lifting inner rod 32 relative to the outer tube 31 to enable the lifting inner rod 32 to be raised and lowered relative to the outer tube 31.

[0035] A pivot member having a through hole passing through in the left-right direction is attached to the upper end of the lifting inner rod 32 of the support column 3, and the rotation mechanism 4 is attached via this pivot member.

[0036] The pivot mechanism 4 includes a shaft support portion 41 , a pivot shaft 42 , a mounting base 43 , a mounting screw 44 , and a wing nut 45 .

[0037] The shaft support portion 41 has a through hole that penetrates in the left-right direction, and the rotating shaft 42 passes through this through hole in the left-right direction and is attached to the upper end (specifically, the shaft support member) of the lifting inner rod 32 of the support portion 3.

[0038] The rotating shaft 42 is disposed so that its axial direction is along the left-right direction, and passes through a through-hole of a shaft support member attached to the upper end of the inner lift rod 32 of the support column 3 and a through-hole of the shaft support portion 41 of the rotating mechanism 4. The rotating mechanism 4 is attached to the upper end of the inner lift rod 32 of the support column 3 via the rotating shaft 42 so as to be rotatable so as to tilt forward and backward so that the degree of inclination in the front-back direction and the up-down direction (in other words, the degree of forward / backward tilt) can be changed.

[0039] The mounting base 43 is composed of a plate-like member. The rotation mechanism 4 is attached to the upper end of the lifting inner rod 32 of the support column 3 so that a plate surface 431 of the mounting base 43 (the front plate surface in the position shown in FIG. 1) can freely rotate within a movable range at least between a forward-facing downward inclination state and a horizontal state. The shape of the plate surface 431 of the mounting base 43 is not limited to a specific shape, but may be, for example, a square, a rectangle, another polygon, a circle, or an ellipse (including rounded corners in the case of a polygon).

[0040] The mounting screws 44 (bolts) are provided such that the axial direction of the mounting screws 44 is perpendicular to the plate surface 431 of the mounting base 43. In the example shown in the figure, two mounting screws 44 are provided aligned along a plane along the front-rear and up-down directions.

[0041] The receiving portion 5 is attached to the rotating mechanism 4. That is, the receiving portion 5 is attached to the upper end of the lifting inner rod 32 of the support portion 3 via the rotating mechanism 4 so as to be rotatable so as to tilt forward and backward.

[0042] The receiving portion 5 has a support rod 51, an upper support rod 52 attached to the upper end of the support rod 51, a lower support rod 53 attached to the lower end of the support rod 51, and a support member 54 extending forward from the lower end surface of the lower support rod 53.

[0043] The support rod 51 is disposed with its longitudinal direction D1 aligned along a plane aligned along the front-rear and up-down directions. A through hole 511 for passing the mounting screw 44 of the turning mechanism 4 is formed in the support rod 51 at a position above the center in the longitudinal direction D1. In the example shown in the figure, two through holes 511 are formed aligned along the longitudinal direction D1 of the support rod 51 in accordance with the number of mounting screws 44 of the turning mechanism 4.

[0044] The upper support rod 52 is fixed to the upper end of the support rod 51 in such a position that the longitudinal direction D2 of the upper support rod 52 is aligned along the left-right direction.

[0045] The lower support rod 53 is fixed to the lower end of the support rod 51 with the longitudinal direction D3 of the lower support rod 53 aligned along the left-right direction.

[0046] The support rod 51, the upper support rod 52, and the lower support rod 53 of the receiving part 5 may each be configured to be extendable and retractable. Each of the support rod 51, the upper support rod 52, and the lower support rod 53 may be configured to have, for example, an outer cylinder and an inner rod that is fitted into the outer cylinder and extends or retracts from one end of the outer cylinder in the axial direction (in other words, protrudes or retracts).

[0047] Furthermore, each of the support rod 51, the upper support rod 52, and the lower support rod 53 may be provided with a locking mechanism for adjusting the longitudinal dimension by expanding and contracting and then maintaining the adjusted state (i.e., the longitudinal dimension). The locking mechanism may be, for example, a mechanism for fixing the positional relationship between the outer tube and the inner rod by tightening a thumbscrew that penetrates the wall of the outer tube in the left-right direction and pressing the tip of the thumbscrew against the outer circumferential surface of the inner rod. Alternatively, the locking mechanism may be a mechanism in which a through hole is formed that penetrates the outer tube and the inner rod in the left-right direction, and multiple through holes that penetrate in the left-right direction in at least one of the outer tube and the inner rod are formed side-by-side in the longitudinal direction of the outer tube and the inner rod, and the positional relationship between the outer tube and the inner rod is fixed by a screw (bolt) and a wing nut that penetrate the through hole of the outer tube and the through hole of the inner rod in the left-right direction (i.e., the longitudinal dimension is adjusted by selecting one of the multiple through holes formed side-by-side in the longitudinal direction of the outer tube or the inner rod).

[0048] By configuring the support rod 51 of the receiving part 5 to be extendable, for example, the dimension in the longitudinal direction D1 of the support rod 51 may be adjusted to match the longitudinal dimension of the ceiling board 6 placed on the receiving part 5. Also, by configuring the upper support rod 52 and the lower support rod 53 of the receiving part 5 to be extendable, for example, the dimension in the longitudinal direction D2 of the upper support rod 52 and the dimension in the longitudinal direction D3 of the lower support rod 53 may be adjusted to match the transverse dimension of the ceiling board 6 placed on the receiving part 5.

[0049] The support member 54 is a flat plate-like member (in other words, a band-like member) and is attached to the lower support rod 53 so that its longitudinal direction runs along the left-right direction and that it protrudes forward from the lower end surface of the lower support rod 53 by fixing the rear portion of its upper plate surface to the underside of the lower support rod 53.

[0050] The receiving part 5 is attached to the pivot mechanism 4 by passing the mounting screws 44 of the pivot mechanism 4 through each of the through holes 511 of the support rod 51 and tightening them with wing nuts 45 fastened to each of the mounting screws 44 with the rear surface of the support rod 51 abutting the plate surface 431 of the mounting base 43.The receiving part 5 is then connected to the upper end of the lifting inner rod 32 of the support part 3 so as to be freely rotatable so as to tilt forward and backward via the pivot mechanism 4.

[0051] (Operation when in use) 3 to 5 are diagrams showing the operation of the work assist tool 1 according to the embodiment when in use. In addition, reference numeral 7 in each drawing denotes a ceiling base to which the ceiling board 6 is attached.

[0052] First, if necessary, the handle 331 is operated to operate the telescopic adjustment mechanism 33, and the support portion 3 is sufficiently shortened so that the receiving portion 5 is in a low position.

[0053] The ceiling board 6 is placed on the receiving part 5 with its lower edge (in other words, the lower side; the same applies below) supported by a support member 54 protruding forward from the lower end surface of the lower support rod 53 (see FIG. 3). Note that, in order to make it easier to place the ceiling board 6, when no external force is acting on the receiving part 5, it is preferable that the receiving part 5 rests in a state of downward inclination facing forward, for example, by interposing a butt (stop) between the pivot part 41 of the rotating mechanism 4 and the upper end (specifically, the pivot member) of the lifting inner rod 32 of the support part 3.

[0054] The ceiling board 6 is a flat member having a rectangular surface. The length and width of the rectangular surface of the ceiling board 6 are not limited to specific values, but an example of the rectangular surface of the ceiling board 6 is a long side of about 1820 mm and a short side of about 910 mm.

[0055] The ceiling board 6 is placed on the receiving part 5 with its lower edge supported by the support member 54 so that the direction along the longer of the vertical and horizontal dimensions of the rectangular plate surface of the ceiling board 6 (i.e., the longitudinal direction of the ceiling board 6) is aligned with the longitudinal direction D1 of the support rod 51 of the receiving part 5.

[0056] Next, the handle 331 is operated to operate the telescopic adjustment mechanism 33, extend the support portion 3, raise the pivot mechanism 4, and adjust the degree of inclination of the ceiling board 6, until the upper edge (in other words, the upper side; the same applies below) of the ceiling board 6 abuts against a specified corner 8 (see Figure 4).

[0057] At this time, the worker supports the lower support rod 53 and support member 54 of the receiving part 5 with one hand, and operates the handle 331 or outer tube 31 of the telescopic adjustment mechanism 33 of the support part 3 with the other hand (the leg part 2 moves horizontally and the work support device 1 moves).

[0058] At this time, since the ceiling board 6 is in an inclined position, the upper edge of the ceiling board 6 is brought into close contact with the specified corner 8, i.e., the alignment of the ceiling board 6 is made reliable and easy, so that the upper edge of the ceiling board 6 is abutted against the specified corner 8 while remaining in an inclined position.

[0059] The specified corner 8 against which the upper edge of the ceiling board 6 abuts is a point that serves as a reference for alignment when the ceiling board 6 is installed, and examples of this include the edge (in other words, the step) of a component that borders or surrounds the area to be covered by the ceiling board and where the ceiling base 7 is prepared, or the edge (in other words, the step) of a ceiling board that has already been installed.

[0060] Next, the handle 331 is operated to operate the telescopic adjustment mechanism 33, extend the support part 3, and raise the rotation mechanism 4, so that the ceiling board 6 together with the receiving part 5 is brought into a horizontal position, and the upper surface of the ceiling board 6 in the horizontal position is pressed against the ceiling substructure 7 (see Figure 5).

[0061] Furthermore, when the ceiling substructure is inclined, the handle 331 is operated to operate the telescopic adjustment mechanism 33, extend the support section 3, and raise the pivot mechanism 4 until the degree of inclination of the ceiling substructure and the degree of inclination of the ceiling board 6 match and the upper surface of the ceiling board 6 (in the inclined position) is pressed against the ceiling substructure.

[0062] At this time, the outer cylinder 31 of the support part 3 and the lower support rod 53 and support member 54 of the receiving part 5 are supported so that the upper edge of the ceiling board 6 is kept abutted against the specified corner 8 (i.e., so that the upper edge of the ceiling board 6 does not move away from the specified corner 8). Specifically, for example, they may be supported so as to be pushed slightly backward.

[0063] At this time, the worker can support the lower support rod 53 and the support member 54 of the receiving part 5 with one hand, and operate the handle 331 or the outer cylinder 31 of the extension and contraction adjustment mechanism 33 of the support part 3 with the other hand. This makes it possible to adjust the degree of inclination of the ceiling board 6, adjust the degree of extension of the support part 3, and adjust the position by moving the support part 3.

[0064] Therefore, the state in which the upper edge of the ceiling board 6 is abutted against the specified corner 8 and aligned can be reliably and easily maintained. As a result, the position of the ceiling board 6 does not shift until the ceiling board 6 is pressed against the ceiling substrate 7, and the ceiling board 6 is placed in the appropriate position and in the appropriate posture.

[0065] When the operation of the handle 331 is stopped with the upper edge of the ceiling board 6 abutting against a predetermined corner 8 and aligned, and the upper surface of the ceiling board 6 being pressed against the ceiling substrate 7, the position and attitude of the ceiling board 6 is fixed and maintained by the action of the telescopic adjustment mechanism 33 (including the action of the locking mechanism). At this time, if the wheels 22 are equipped with stoppers (in other words, brakes), the stoppers may be put into operation to fix the rotation of the wheels 22.

[0066] Then, nails, tacks, screws, etc. are driven into the ceiling board 6, and the ceiling board 6 is fixed and attached to the ceiling base 7.

[0067] (Dimensions) FIG. 6 is a diagram for explaining the dimensional relationship related to the receiving portion 5 of the work support tool 1 according to the embodiment.

[0068] The midpoint in the longitudinal direction D1 of the two through holes 511 aligned along the longitudinal direction D1 of the support rod 51 of the receiving part 5 is a position corresponding to the axis of the pivot shaft 42, a position corresponding to the connection point between the support rod 51 of the receiving part 5 and the inner lift rod 32 of the support part 3, and a position corresponding to the rotation center when the receiving part 5 rotates. Such a position corresponding to the connection point between the support rod 51 of the receiving part 5 and the inner lift rod 32 of the support part 3 and corresponding to the rotation center when the receiving part 5 rotates is referred to as the "rotation fulcrum position 56."

[0069] With regard to the receiving portion 5 (in other words, the support rod 51), the dimension in the longitudinal direction D1 is L, the dimension from the upper end (in other words, the upper support rod 52) to the pivot fulcrum position 56 is L1, and further, the dimension from the lower end (in other words, the lower support rod 53) to the pivot fulcrum position 56 is L2.

[0070] Moreover, the longitudinal dimension of the ceiling board 6 is represented by H.

[0071] In this case, the ratio (i.e., L / H) of the dimension L in the longitudinal direction D1 of the receiving portion 5 (support rod 51) to the longitudinal dimension H of the ceiling board 6 is preferably 2 / 3 or more and less than 1, and more preferably 4 / 5 or more and less than 1.

[0072] By configuring the support rod 51 of the receiving portion 5 to be extendable, the ratio (i.e., L / H) of the longitudinal dimension L of the receiving portion 5 (support rod 51) in the longitudinal direction D1 to the longitudinal dimension H of the ceiling board 6 may be adjusted to be within the above-mentioned preferred range.

[0073] In addition, the ratio of the dimension L1 from the upper end to the pivot point position 56 to the dimension L in the longitudinal direction D1 of the receiving portion 5 (support rod 51) (i.e., L1 / L) is preferably 1 / 7 or more and 1 / 3 or less, more preferably 1 / 6 or more and 4 / 1 or less, and even more preferably 1 / 5. <L2である。

[0074] By setting the ratio of the dimension L1 from the upper end to the pivot point position 56 to the dimension L in the longitudinal direction D1 of the receiving portion 5 (support rod 51) (i.e., L1 / L) to 1 / 3 or less, the lower support rod 53 can be stably positioned lower than the upper support rod 52 when the work support device 1 is in use, and ultimately, the lower edge of the ceiling board 6 can be properly supported by the support member 54.

[0075] If the ratio (i.e., L1 / L) of the dimension L1 from the upper end to the pivot position 56 to the dimension L in the longitudinal direction D1 of the receiving portion 5 (support rod 51) is greater than 1 / 3, the distance between the upper edge of the ceiling board 6 abutting against the specified corner 8 and the pivot position 56 becomes longer when the work auxiliary tool 1 is in use. For this reason, the dimension by which the support portion 3 is extended becomes longer until the degree of inclination of the ceiling base 7 and the degree of inclination of the ceiling board 6 match with each other in a state where the upper edge of the ceiling board 6 abuts against the specified corner 8 and the upper surface of the ceiling board 6 is pressed against the ceiling base 7 (i.e., until the attitude of the ceiling board 6 is changed from the state shown in FIG. 4 to the state shown in FIG. 5 with the upper edge of the ceiling board 6 abutting against the specified corner 8 as the center of rotation (fulcrum)), and the efficiency of the work of placing the ceiling board 6 deteriorates.

[0076] Furthermore, if the ratio (i.e., L1 / L) of the dimension L1 from the upper end to the pivot position 56 to the dimension L in the longitudinal direction D1 of the receiving portion 5 (support rod 51) is smaller than 1 / 7, the distance between the upper edge of the ceiling board 6 abutting against the specified corner 8 and the pivot position 56 becomes extremely short when the work auxiliary tool 1 is in use. For this reason, until the degree of inclination of the ceiling base 7 and the degree of inclination of the ceiling board 6 match in a state where the upper edge of the ceiling board 6 abuts against the specified corner 8 and the upper surface of the ceiling board 6 is pressed against the ceiling base 7 (i.e., until the attitude of the ceiling board 6 is changed from the state shown in FIG. 4 to the state shown in FIG. 5 with the upper edge of the ceiling board 6 abutting against the specified corner 8 as the center of rotation (fulcrum)), a large force is required to extend the inner lift rod 32, and the telescopic adjustment mechanism 33 cannot be operated smoothly.

[0077] Specifically, for example, assuming that the longitudinal dimension H of the ceiling board 6 is about 1820 mm, when such a ceiling board 6 is mainly used, the longitudinal dimension L of the receiving part 5 (support rod 51) in the longitudinal direction D1 may be set to about 1500 mm (e.g., ±50 mm), while the dimension L1 from the upper end to the pivot point position 56 may be set to about 300 mm (e.g., ±10 mm), and the dimension L2 from the lower end to the pivot point position 56 may be set to about 1200 mm (e.g., ±40 mm). The longitudinal dimension H of the ceiling board 6 is the dimension along the longitudinal direction D1 of the receiving part 5 (support rod 51) when the ceiling board 6 is placed on the receiving part 5.

[0078] It is assumed that the short-side dimension of the ceiling board 6 is, for example, about 910 mm, and when such a ceiling board 6 is mainly used, the dimension in the longitudinal direction D2 of the upper support rod 52 and the dimension in the longitudinal direction D3 of the lower support rod 53 may be set to, for example, about 300 mm (for example, ±10 mm). The short-side dimension of the ceiling board 6 is the dimension along the longitudinal direction D2 of the upper support rod 52 and the longitudinal direction D3 of the lower support rod 53 when the ceiling board 6 is placed on the receiving part 5.

[0079] In other words, the ratio of the longitudinal dimension D2 of the upper support rod 52 to the short side dimension of the ceiling board 6, and the ratio of the longitudinal dimension D3 of the lower support rod 53 to the short side dimension of the ceiling board 6 are preferably greater than or equal to 1 / 4 and less than or equal to 1 / 2, and more preferably approximately 1 / 3 (for example, greater than or equal to 290 / 910 and less than or equal to 310 / 910).

[0080] By configuring the upper support rod 52 and the lower support rod 53 of the receiving portion 5 to be extendable and contractible, the ratio of the longitudinal dimension D2 of the upper support rod 52 to the short side dimension of the ceiling board 6, and the ratio of the longitudinal dimension D3 of the lower support rod 53 to the short side dimension of the ceiling board 6 may be adjusted to be within the above-mentioned preferred range.

[0081] (Action and effect) According to the work auxiliary tool 1 of the embodiment, the alignment of the ceiling board can be performed reliably and easily.

[0082] The above describes an embodiment of the present invention, but the specific configuration of the present invention is not limited to the above embodiment, and the present invention also includes embodiments in which modifications and changes are made to the above embodiment without departing from the gist of the present invention. [Explanation of symbols]

[0083] 1 Work aids 2 legs 21 legs 22 wheels 23 1st pillar support part 24 2nd pillar support part 25 Support part 3 Support section 31 Outer cylinder 32 Lifting rod 33 Telescopic adjustment mechanism 331 Handle 4 Rotating mechanism 41 Axis branch 42 Rotating shaft 43 Mounting stand 431 Board surface 44 Mounting screw 45 Wing nut 5 Receiving part 51 Support rod 511 Through hole 52 Upper support rod 53 Lower support rod 54 Support member 56 Pivot point position 6 Ceiling Board 7 Ceiling underlayment 8 Corners (reference points for alignment)

Claims

1. A leg having a wheel; A support part supported by the leg part and capable of expanding and contracting along the vertical direction; a receiving portion attached to the upper end of the support portion so as to be rotatable so as to tilt forward and backward, and on which a ceiling board is placed, a dimension from an upper end of the receiving portion to a pivot point position is smaller than a dimension from a lower end of the receiving portion to the pivot point position; A work assist device characterized by:

2. The ratio of the longitudinal dimension L of the receiving portion to the longitudinal dimension H of the ceiling board (i.e., L / H) is 2 / 3 or more and less than 1; 2. The work support device according to claim 1 .

3. a ratio (i.e., L1 / L) of a dimension L1 from an upper end of the receiving portion to the pivot position to a longitudinal dimension L of the receiving portion is 1 / 7 or more and 1 / 3 or less; 2. The work support device according to claim 1 .

4. The longitudinal dimension of the receiving portion is 1450 to 1550 mm, and the dimension from the upper end of the receiving portion to the pivot point position is 290 to 310 mm.

2. The work support device according to claim 1 .

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