Work support tools

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 an instrument suitable for use when performing the operation of attaching a ceiling board to a ceiling base.

Background Art

[0002] As a conventional instrument used when attaching a ceiling board to the ceiling base of a building, an auxiliary machine for attaching a ceiling board is known, which includes a self-supporting column having a telescopic mechanism and a board support portion detachably attached to the upper part of the column (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when attaching a ceiling board to a ceiling base, it is necessary to align the edges of a predetermined range covered by the ceiling board, as well as the edges of the already attached ceiling board and the edge of the ceiling board without any gaps. However, the auxiliary machine described in Patent Document 1 has a problem that although the ceiling board can be lifted, the alignment of the ceiling board cannot be performed reliably and easily.

[0005] Therefore, an object of the present invention is to provide a technique capable of reliably and easily aligning a ceiling board in one aspect.

Means for Solving the Problems

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

[0007] The work assistance device according to the present invention may be configured such that 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.

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

[0009] The work assistance device according to the present invention may have a longitudinal dimension of 1450 to 1550 mm for the receiving portion, and a dimension of 290 to 310 mm from the upper end of the receiving portion to the pivot point position. [Effects of the Invention]

[0010] According to the present invention, on one side, it becomes possible to reliably and easily align the ceiling boards. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view showing a schematic overview of the overall configuration of a work assistance device according to an embodiment of the present invention. [Figure 2] This is a front view showing the rotation mechanism and receiving part of a work assistance device according to an embodiment. [Figure 3] Figure 1 shows the operation of the work assistance device when in use, with the ceiling board placed on the receiving part. [Figure 4]This figure shows the state following the state shown in Figure 3, where the upper edge of the ceiling board is abutted against a predetermined corner and aligned. [Figure 5] This figure shows the state following the condition shown in Figure 4, where the ceiling board is positioned horizontally and pressed against the ceiling substrate. [Figure 6] This diagram illustrates the dimensional relationships related to the receiving portion of the work aid tool shown in Figure 1. [Modes for carrying out the invention]

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

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

[0014] (Overall structure) Figure 1 is a side view showing a schematic overview of the overall configuration of a work assistance device 1 according to an embodiment, as an example of a specific configuration of the work assistance device according to the present invention. Figure 2 is a front view showing the rotation mechanism 4 and the receiving part 5 of the work assistance device 1 according to the embodiment.

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

[0016] The work assisting device 1 has a leg part 2, a support column part 3, a rotation mechanism 4, and a receiving part 5.

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

[0018] Three legs 21 are arranged at intervals of 120° in a 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 a plan view is appropriately set to an appropriate dimension in consideration of ensuring the stability of the self - standing property of the work assisting device 1 while holding the ceiling board 6.

[0019] The wheels 22 are attached to the lower ends of the tips of each of the plurality of legs 21 to facilitate the movement of the work assisting device 1 such that the leg part 2 can travel horizontally with respect to the floor surface on which the leg part 2 is installed.

[0020] The wheels 22 are preferably casters that can rotate horizontally with an axis along the vertical direction as the rotation axis. The wheels 22 preferably further include a stopper (or, 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, horizontally rotatable casters with stoppers are attached to the lower ends of the tips of each of the three legs 21.

[0022] The base ends of each of the plurality of legs 21 are fixed to the side surface of the first support column support part 23.

[0023] Below the first support section 23, a second support section 24 and a support section 25 are provided. The second support section 24 is supported and fixed below the first support section 23 by fixing rods between it and each of the multiple legs 21. The support section 25 is fixed and attached to the lower end of the second support section 24.

[0024] A through-hole is formed in both the first support section 23 and the second support section 24, extending vertically. The through-hole in the first support section 23 and the through-hole in the second support section 24 are formed to be coaxial with each other in the vertical direction. The support receiving section 25 has a hole that communicates with the through-hole in the second support section 24, and is oriented vertically and has a closed lower end (in other words, is blocked).

[0025] The lower end of the support column 3 is inserted through the upper end opening of the through hole that runs vertically through the first support column 23, causing the support column 3 to penetrate both the first support column 23 and the second support column 24, and the lower end of the support column 3 to enter the support column receiving portion 25. With the lower end of the support column 3 in contact with the lower end (in other words, the bottom surface) of the support column receiving portion 25, the support column 3 is supported and held by the leg portion 2 in a position where its axial direction is aligned vertically.

[0026] At least one of the first support section 23 and the second support section 24 may be provided with a tightening mechanism (not shown) for fixing the support section 3 while supporting and holding it. As a tightening mechanism, for example, a mechanism that tightens the circumferential surface of the column by reducing the diameter of an annular member that surrounds the column in the horizontal direction may be used.

[0027] The support column 3 is configured as an extendable columnar body. Specifically, the support column 3 has an outer cylinder 31 and an inner lifting rod 32 fitted inside the outer cylinder 31 that extends out from and retracts (in other words, protrudes and retracts) from the upper end of the outer cylinder 31. In other words, the support column 3 is configured to be extendable and retractable along the vertical direction.

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

[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 adjusts the degree to which the lifting inner rod 32 extends or retracts relative to the outer cylinder 31, and also 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 particular mechanism, but may include, for example, a handle-operated elevator mechanism.

[0031] The handle-operated elevator mechanism may be configured such that, for example, 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 surface of the lifting rod 32 along the axial direction of the lifting rod 32. When the handle 331 provided on the outer cylinder 31 is turned, the spur gear rotates, and the degree to which the lifting rod 32 extends or retracts relative to the outer cylinder 31 is changed (in other words, adjusted) through the meshing of the spur gear with the rack provided on the lifting rod 32.

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

[0033] The telescopic adjustment mechanism 33 may be configured such that when the operation of the telescopic adjustment mechanism 33 is stopped when the extension / retraction of the lifting inner rod 32 relative to the outer cylinder 31 reaches a desired extent (for example, when the handle 331 is stopped turning), the lifting / retraction of the lifting inner rod 32 relative to the outer cylinder 31 is stopped (in other words, the degree to which the lifting inner rod 32 extends / retracts relative to the outer cylinder 31 is fixed).

[0034] The telescopic adjustment mechanism 33 may also be configured to include a locking mechanism that fixes the position of the lifting inner rod 32 relative to the outer cylinder 31 (in other words, the degree of extension / retraction of the lifting inner rod 32 relative to the outer cylinder 31) when the extension / retraction of the lifting inner rod 32 relative to the outer cylinder 31 reaches a desired degree, or releases the lock on the position of the lifting inner rod 32 relative to the outer cylinder 31, thereby enabling the lifting inner rod 32 relative to the outer cylinder 31 to move up and down.

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

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

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

[0038] The pivot shaft 42 is positioned so that its axial direction aligns with the left-right direction, and it passes through the through hole of the pivot member attached to the upper end of the lifting rod 32 of the support column 3 and the through hole of the pivot member 41 of the pivot mechanism 4. The pivot mechanism 4 is attached to the upper end of the lifting rod 32 of the support column 3 so as to be rotatable via the pivot shaft 42 to tilt back and forth so as to change the degree of inclination in the front-rear and up-down directions (in other words, the degree of forward / backward tilt).

[0039] The mounting base 43 is made up of a plate-shaped member. The rotation mechanism 4 is attached to the upper end of the lifting rod 32 of the support column 3 so that the plate surface 431 of the mounting base 43 (the front plate surface in the posture shown in Figure 1) can rotate freely within a range of motion between at least a forward downward inclined 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, rectangle, other polygon, circle, or ellipse (including rounded corners in the case of polygons).

[0040] The mounting screws 44 (bolts) are installed so that their axial direction 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 that runs in the front-to-back and up-to-down directions.

[0041] The receiving part 5 is attached to the rotating mechanism 4. That is, the receiving part 5 is attached to the upper end of the lifting rod 32 of the support column 3 so as to be able to rotate back and forth via the rotating mechanism 4.

[0042] The receiving portion 5 includes 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 that extends forward from the lower end surface of the lower support rod 53.

[0043] The support rod 51 is positioned so that its longitudinal direction D1 is aligned with a plane that is aligned in the front-rear and up-down directions. A through hole 511 for passing the mounting screws 44 of the rotation 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 along the longitudinal direction D1 of the support rod 51, corresponding to the number of mounting screws 44 of the rotation mechanism 4.

[0044] The upper support rod 52 is fixed and attached to the upper end of the support rod 51 in a position where its longitudinal direction D2 is aligned with the left-right direction.

[0045] The lower support rod 53 is fixed and attached to the lower end of the support rod 51 in a position where its longitudinal direction D3 is aligned with the left-right direction.

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

[0047] Furthermore, the support rods 51, 52, and 53 may each be provided with a locking mechanism to adjust their longitudinal dimensions by extending or retracting and then maintain the adjusted state (i.e., longitudinal dimensions). The locking mechanism may be, for example, a mechanism that fixes the positional relationship between the outer cylinder and the inner rod by tightening a wing nut that penetrates the wall of the outer cylinder along the left-right direction, thereby pressing the tip of the wing nut against the outer circumferential surface of the inner rod. Alternatively, the locking mechanism may be a mechanism in which through holes are formed in the outer cylinder and the inner rod along the left-right direction, and multiple through holes are formed in at least one of the outer cylinder and the inner rod, aligned along the longitudinal direction of the outer cylinder and the inner rod, and the positional relationship between the outer cylinder and the inner rod is fixed by screws (bolts) and wing nuts that pass through these through holes in the outer cylinder and the inner rod along the left-right direction (that is, the longitudinal dimension is adjusted by selecting one of the multiple through holes formed along the longitudinal direction of the outer cylinder and the inner rod).

[0048] By configuring the support rod 51 of the receiving section 5 to be extendable and retractable, for example, the longitudinal dimension D1 of the support rod 51 can be adjusted to match the longitudinal dimension of the ceiling board 6 placed on the receiving section 5. Furthermore, by configuring the upper support rod 52 and lower support rod 53 of the receiving section 5 to be extendable and retractable, for example, the longitudinal dimension D2 of the upper support rod 52 and the longitudinal dimension D3 of the lower support rod 53 can be adjusted to match the short-side dimension of the ceiling board 6 placed on the receiving section 5.

[0049] The support member 54 is a flat plate-shaped (in other words, strip-shaped) member, and is attached to the lower support rod 53 by fixing the rear portion of the upper plate surface to the lower surface of the lower support rod 53 in an orientation where its longitudinal direction is aligned with the left-right direction, so that it protrudes forward from the lower end surface of the lower support rod 53.

[0050] The receiving portion 5 is attached to the rotating mechanism 4 by passing the mounting screws 44 of the rotating 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 while the rear surface of the support rod 51 is in contact with the plate surface 431 of the mounting base 43. Consequently, it is connected to the upper end of the lifting inner rod 32 of the support column portion 3 so as to be able to rotate back and forth via the rotating mechanism 4.

[0051] (Operation during use) Figures 3 to 5 show the operation of the work assistance device 1 according to the embodiment. Reference numeral 7 in each figure indicates the ceiling base to which the ceiling board 6 is attached.

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

[0053] The lower edge (or lower edge; hereafter the same) of the ceiling board 6 is supported by a support member 54 that extends forward from the lower end surface of the lower support rod 53, and the ceiling board 6 is placed on the receiving part 5 (see Figure 3). In order to facilitate the placement of the ceiling board 6, it is preferable that when no external force is acting on the receiving part 5, the receiving part 5 remains stationary in a forward downward inclination, for example, by interposing a support between the pivot 41 of the rotation mechanism 4 and the upper end of the lifting rod 32 of the support column 3 (specifically, the pivot member).

[0054] The ceiling board 6 is a flat, rectangular panel. While the length and width dimensions of the rectangular surface of the ceiling board 6 are not limited to specific values, an example would be a panel with a length of approximately 1820 mm and a width of approximately 910 mm.

[0055] The lower edge of the ceiling board 6 is supported by the support member 54 and placed on the receiving part 5 such that the direction along the longer side of the rectangular dimensions of the 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, the telescopic adjustment mechanism 33 is activated, the support column 3 extends, the rotation mechanism 4 rises, and the degree of inclination of the ceiling board 6 is adjusted, so that the upper edge (in other words, the upper edge; the same applies hereafter) of the ceiling board 6 abuts against a predetermined corner 8 (see Figure 4).

[0057] In this process, the worker supports the lower support rod 53 and support member 54 of the receiving section 5 with one hand, while operating the handle 331 or outer cylinder 31 of the telescopic adjustment mechanism 33 of the support column section 3 with the other hand (the leg section 2 moves horizontally and the work assistance device 1 moves).

[0058] At this time, because the ceiling board 6 is in an inclined position, the upper edge of the ceiling board 6 can be brought into close contact with the predetermined corner 8, that is, the positioning of the ceiling board 6 can be made reliably and easily, so that the upper edge of the ceiling board 6 abuts against the predetermined corner 8 while the ceiling board 6 remains in an inclined position.

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

[0060] Next, the handle 331 is operated, the telescopic adjustment mechanism 33 is activated, the support column 3 is extended, and the rotation mechanism 4 is raised, so that the ceiling board 6, together with the receiving part 5, is placed in a horizontal position, and the upper surface of the ceiling board 6 in the horizontal position is pressed against the ceiling base 7 (see Figure 5).

[0061] Furthermore, if the ceiling substrate is sloped, the handle 331 is operated until the degree of slope of the ceiling substrate matches the degree of slope of the ceiling board 6, and the upper surface of the ceiling board 6 (in its sloped position) is pressed against the ceiling substrate. This activates the telescopic adjustment mechanism 33, extends the support column 3, and raises the rotation mechanism 4.

[0062] At this time, the outer cylinder 31 of the support column 3 and the lower support rod 53 and support member 54 of the receiving portion 5 are supported so that the upper edge of the ceiling board 6 is maintained in contact with the predetermined corner 8 (i.e., the upper edge of the ceiling board 6 does not move away from the predetermined corner 8). Specifically, for example, they may be supported by being slightly pushed backward.

[0063] In this process, the worker can support the lower support rod 53 and support member 54 of the receiving section 5 with one hand, while operating the handle 331 or outer cylinder 31 of the extension adjustment mechanism 33 of the support column 3 with the other hand. This allows the worker to adjust the degree of inclination of the ceiling board 6, adjust the degree of extension of the support column 3, and adjust the position of the support column 3 by moving it.

[0064] Therefore, the state in which the upper edge of the ceiling board 6 is abutted against the predetermined corner 8 and aligned is reliably and easily maintained. As a result, the position of the ceiling board 6 does not shift until it is pressed against the ceiling base 7, and the ceiling board 6 is positioned in the correct position and orientation.

[0065] When the operation of the handle 331 is stopped while the upper edge of the ceiling board 6 is aligned with a predetermined corner 8 and the upper surface of the ceiling board 6 is pressed against the ceiling base 7, the position and orientation of the ceiling board 6 are 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 activated 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] (Dimensional relationships) Figure 6 is a diagram illustrating the dimensional relationships related to the receiving portion 5 of the work assistance tool 1 according to the embodiment.

[0068] The midpoint 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 lifting / lowering internal rod 32 of the support column 3, and a position corresponding to the pivot center when the receiving part 5 rotates. This position, which corresponds to the connection point between the support rod 51 of the receiving part 5 and the lifting / lowering internal rod 32 of the support column 3, and is the pivot center when the receiving part 5 rotates, is called the "pivot point position 56".

[0069] With respect 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 point position 56 is L1, and further, the dimension from the lower end (in other words, the lower support rod 53) to the pivot point position 56 is L2.

[0070] Furthermore, with respect to the ceiling board 6, the lengthwise dimension is denoted as H.

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

[0072] The support rod 51 of the receiving portion 5 may be configured to be extendable and retractable so that the ratio 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 (i.e., L / H) is adjusted to fall within the above-mentioned preferred range.

[0073] Furthermore, 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 D1 in the longitudinal direction 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 below the upper support rod 52 when the work assistance device 1 is in use, and consequently, the lower edge of the ceiling board 6 can be properly supported by the support member 54.

[0075] If the ratio of the dimension L1 from the upper end to the pivot point position 56 to the dimension D1 in the longitudinal direction of the receiving part 5 (support rod 51) (i.e., L1 / L) is greater than 1 / 3, then when using the work aid tool 1, the distance between the upper edge of the ceiling board 6 abutting against a predetermined corner 8 and the pivot point position 56 becomes longer. As a result, the length by which the support column 3 needs to be extended becomes longer until the degree of inclination of the ceiling substrate 7 matches the degree of inclination of the ceiling board 6 and the upper surface of the ceiling board 6 is pressed against the ceiling substrate 7 (i.e., until the posture of the ceiling board 6 is changed from the state shown in Figure 4 to the state shown in Figure 5, with the upper edge of the ceiling board 6 abutting against a predetermined corner 8 as the center of rotation (pivot point)), and the efficiency of the work of positioning the ceiling board 6 deteriorates.

[0076] Furthermore, if the ratio of the dimension L1 from the upper end to the pivot point position 56 to the dimension D1 in the longitudinal direction of the receiving portion 5 (support rod 51) (i.e., L1 / L) is less than 1 / 7, the distance between the upper edge of the ceiling board 6 abutting against a predetermined corner 8 and the pivot point position 56 becomes extremely short when using the work aid 1. As a result, the force required to extend the lifting rod 32 becomes large until the degree of inclination of the ceiling substrate 7 matches the degree of inclination of the ceiling board 6 and the upper surface of the ceiling board 6 is pressed against the ceiling substrate 7 (i.e., until the posture of the ceiling board 6 is changed from the state shown in Figure 4 to the state shown in Figure 5, with the upper edge of the ceiling board 6 abutting against a predetermined corner 8 as the center of rotation (pivot point)), making it difficult to operate the extension and retraction adjustment mechanism 33 smoothly.

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

[0078] It is assumed that the dimension of the shorter side of the ceiling board 6 is, for example, about 910 mm. When mainly dealing with such ceiling boards 6, the dimension of the longer side D2 of the upper support rod 52 and the dimension of the longer side D3 of the lower support rod 53 may be set to, for example, about 300 mm (for example, ±10 mm). The dimension of the shorter side of the ceiling board 6 is the dimension that aligns with the length of the upper support rod 52 D2 and the length of the lower support rod 53 D3 when the ceiling board 6 is placed on the support part 5.

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

[0080] The upper support rod 52 and lower support rod 53 of the receiving portion 5 are configured to be extendable and retractable, so that the ratio of the length D2 dimension of the upper support rod 52 to the length dimension of the ceiling board 6, and the ratio of the length D3 dimension of the lower support rod 53 to the length dimension of the ceiling board 6, can be adjusted to fall within the above-mentioned preferred range.

[0081] (Effects and Benefits) According to the work assistance device 1 of the embodiment, it becomes possible to reliably and easily align the ceiling board.

[0082] Although embodiments of the present invention have been described above, the specific configurations of the present invention are not limited to the embodiments described above. The present invention also includes forms in which modifications and changes are made to the above embodiments without departing from the spirit of the 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 column support section 3 Support section 31 Outer cylinder 32 Lifting rod 33 Telescopic adjustment mechanism 331 Handle 4 rotation mechanism 41 Axis branch 42 pivot shafts 43 Mounting base 431 Board surface 44 Mounting screws 45 Wing nuts 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 substructure Octagonal section (the reference point for alignment)

Claims

1. Legs having wheels, A support column, which is supported by the aforementioned legs and is extendable and retractable along the vertical direction, It has a support portion attached to the upper end of the support column so as to be rotatable to tilt forward and backward, on which a ceiling board is placed, The distance from the upper end of the receiving portion to the pivot point is smaller than the distance from the lower end of the receiving portion to the pivot point. 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. A work assistance device characterized by the following features.

2. Legs having wheels, A support column, which is supported by the aforementioned legs and is extendable and retractable along the vertical direction, It has a support portion attached to the upper end of the support column so as to be rotatable to tilt forward and backward, on which a ceiling board is placed, The distance from the upper end of the receiving portion to the pivot point is smaller than the distance from the lower end of the receiving portion to the pivot point. The ratio of the dimension L1 from the upper end of the receiving portion to the pivot point position to the longitudinal dimension L of the receiving portion (i.e., L1 / L) is 1 / 7 or more and 1 / 3 or less. A work assistance device characterized by the following features.

3. Legs having wheels, A support column, which is supported by the aforementioned legs and is extendable and retractable along the vertical direction, It has a support portion attached to the upper end of the support column so as to be rotatable to tilt forward and backward, on which a ceiling board is placed, The distance from the upper end of the receiving portion to the pivot point is smaller than the distance from the lower end of the receiving portion to the pivot point. The longitudinal dimension of the receiving portion is 1450 to 1550 mm, and the distance from the upper end of the receiving portion to the pivot point position is 290 to 310 mm. A work assistance device characterized by the following features.

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