Rotation tool

Abstract

To provide a rotary tool capable of rotating rotation objects of various shapes.SOLUTION: The rotary tool 10 includes the main body case 11, the input shaft 12 having the first end 35 protruding from the main body case 11 and rotated about the first axial line L1 by the impact driver 90, the worm gear 14 located at the second end 36 opposite to the first end 35 in the main body case 11, and the opening 53 continuous with the center hole 54 and forming one space. The device is provided with a worm wheel (15) which rotates around a second axis (L2) parallel to a first virtual straight line (M1) orthogonal to a first axis (L1) of an input shaft (12), and a flexible bag-shaped bag section (16) fixed to an edge (55) of a center hole (54), wherein the worm wheel (15) is rotatably supported by a body case (11) and meshes with a worm gear (14), and the bag section (16) is deformable between a first state in which air (72) is discharged and contracted and a second state in which air (72) is filled and expanded.SELECTED DRAWING: Figure 6

Description

Technical Field

[0004] ,

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[0001] The present invention relates to a rotary tool of an electric rotary tool used when attaching a reinforcing material to a structural material of a building.

Background Art

[0002] Patent Document 1 discloses a turnbuckle tool. The turnbuckle tool is used when attaching braces to columns or beams to reinforce a building. In the brace, the turnbuckle body is rotated to adjust the length of the brace steel. An operator attaches the turnbuckle tool to the output end of an impact driver to rotate the turnbuckle body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, turnbuckles have various forms, and in order to rotate the turnbuckle body, it is necessary to use a dedicated rotary tool that conforms to its outer shape. In addition, there are reinforcing materials for buildings other than braces. For example, in a wooden house, a fire-stopping material is used. When attaching the fire-stopping material to a metal fitting, it is convenient to have a rotary tool suitable for rotating the fire-stopping material.

[0005] <s The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotary tool capable of rotating a rotation target having various shapes.

Means for Solving the Problems

[0006] (1) The rotary tool according to the present invention comprises a main body case, an input shaft whose first end protrudes from the main body case and which rotates around a first axis when the first end engages with the output end of an electric rotary tool, a worm gear located at a second end of the input shaft opposite to the first end and housed in the main body case, a worm wheel having an opening that forms a single space continuous with the central hole and which rotates around a second axis parallel to a first virtual straight line perpendicular to the first axis of the input shaft, and a flexible bag-shaped bag portion fixed to the edge of the central hole, wherein the worm wheel is rotatably supported by the main body case and meshes with the worm gear, and the bag portion is deformable between a first state in which fluid is discharged and the bag contracts and a second state in which the fluid is filled and the bag expands toward the center of the central hole.

[0007] According to the above configuration, the object to be rotated is inserted into the central hole through the opening of the worm wheel. When the bag portion in the first state is filled with fluid, the bag portion expands toward the center of the central hole and enters the second state. In the second state, the flexible bag portion deforms along the outer shape of the object to be rotated and adheres tightly to the outer surface of the object to be rotated. When the worm wheel rotates in this state, the friction between the bag portion and the outer surface of the object to be rotated transmits the rotation of the worm wheel to the object to be rotated, causing the object to rotate.

[0008] (2) Claim 2 is a rotating tool according to Claim 1, wherein the bag portion comprises a first passage and a second passage that communicate the inside of the bag portion with the outside, a pump that supplies the fluid to the first passage, a check valve located in the first passage that allows the fluid to flow only from the outside to the inside, and an on / off valve located in the second passage that can switch between the flow and blocking of the fluid between the outside and the inside.

[0009] With the above configuration, the degree of contact between the bag and the rotating object can be easily adjusted because the fluid can be easily filled into and discharged from the bag.

[0010] (3) Claim 3 is a rotary tool according to claim 1 or 2, wherein, when viewed from a direction along the second axis, the distance from the second axis toward the opening to the first tip located at the tip of the bag portion is greater than the distance from the second axis toward the tip of the bag portion in the direction opposite to the opening from the second axis.

[0011] According to the above configuration, in the second state, a portion of the bag near the opening of the worm wheel bulges out on the side of the rotating object that narrows the opening. This makes it difficult for the rotating object to escape from the opening.

[0012] (4) Claim 4 is a rotary tool according to any one of claims 1 to 3, wherein the bag portion comprises a first portion, a second portion, and a third passage through which the fluid can flow between the first portion and the second portion, the first portion being located on a second imaginary straight line perpendicular to the direction from the central hole toward the opening and the second axis, and the second portion being located symmetrically to the first portion with respect to the second axis.

[0013] According to the above configuration, the object to be rotated, inserted into the central hole, is sandwiched between the first and second parts in the second state. On the other hand, the object to be rotated does not come into contact with the bag portion on the opposite side of the worm wheel's opening. Therefore, even if the bag portion expands, the object to be rotated is not pushed out of the central hole towards the opening, but is stably held near the center of the worm wheel. [Effects of the Invention]

[0014] The present invention provides a rotating tool capable of rotating objects of various shapes. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a perspective view showing the bracing 79 installed between the roof beam 76 and the eaves purlin 77. [Figure 2] Figure 2 is a magnified view of a portion of the flint 79 shown in Figure 1. [Figure 3]FIG. 3 is a right side view showing the rotary tool 10 according to an embodiment of the present invention. [Figure 4] FIG. 4 is a rear view showing the rotary tool 10 shown in FIG. 3. [Figure 5] FIG. 5 is a cross-sectional view taken along the line A-A of FIG. 4. [Figure 6] FIG. 6(A) is a right side view showing the worm wheel 15 in the first state, and FIG. 6(B) is a right side view showing the worm wheel 15 in the second state. [Figure 7] FIG. 7 is a cross-sectional view taken along the line B-B of FIG. 6(B). [Figure 8] FIG. 8 is a diagram for explaining the procedure of installing the striker 79. [Figure 9] FIG. 9(A) is a diagram showing the bag portion 16A in the first state for the rotary tool according to Modification 1, and FIG. 9(B) is a diagram showing the bag portion 16A in the second state. [Figure 10] FIG. 10(A) is a diagram showing the bag portion 16B in the first state for the rotary tool according to Modification 2, and FIG. 10(B) is a diagram showing the bag portion 16B in the second state. [Figure 11] FIG. 11 is a diagram for explaining the procedure of installing the striker body 80C shown in Modification 3.

MODE FOR CARRYING OUT THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described. It should be noted that the embodiments described below are merely examples of the present invention, and it is needless to say that the embodiments of the present invention can be appropriately changed without changing the gist of the present invention. Further, in the following description, the direction in which the input shaft 12 extends is the front-rear direction 4, the direction from the first end 35 to the second end 36 on the input shaft 12 is defined as the front, and the opposite direction is the rear. The direction in which the rotation axis of the worm wheel 15 extends and is orthogonal to the front-rear direction 4 is the left-right direction 5. The direction toward the left side of the paper surface of FIG. 4 is defined as the left, and the opposite direction is the right. The direction orthogonal to both the front-rear direction 4 and the left-right direction 5 is the up-down direction 6. In the rotary tool 10, the direction from the worm wheel 15 to the worm gear 14 is defined as the up, and the opposite direction is the down.

[0017] [Fire striking 79] For buildings, reinforcing materials such as fire striking 79 or cross members are installed on beams, foundations, or columns for the purpose of enhancing strength. In the following, the case where fire striking 79 is installed on a beam will be described. As shown in FIG. 1, fire striking 79 is installed near the corner positions on the purlin 76 and the eaves beam 77 that are perpendicular to each other. The fire striking 79 includes a first fitting 83 fixed to the inner surface 77a of the eaves beam 77 by screws 78, a second fitting 84 fixed to the inner surface 76a of the purlin 76 by screws 78, a first end portion 80a fixed to the first fitting 83, a second end portion 80b located on the opposite side of the first end portion 80a, and a fire striking body 80 located between the first end portion 80a and the second end portion 80b.

[0018] As shown in FIG. 2, the first fitting 83 has a first opposing surface 180 facing the second fitting 84 side, a first upper surface 181 facing upward, a first lower surface 182 facing downward, and a first abutting surface 183 abutting against the inner surface 77a of the eaves beam 77. The first fitting 83 is closed toward the corner where the purlin 76 and the eaves beam 77 intersect, and a first opening 184 is opened toward the opposite side. The first opening 184 is located at the ends of the first opposing surface 180, the first upper surface 181, the first lower surface 182, and the first abutting surface 183. The opening dimension of the first opening 184 in the vertical direction 6 is such that a tool 104 (see FIG. 8) such as a wrench can be inserted and the nut 95 cannot be rotated by the tool 104. A first groove 185 that is continuous with the first opening 184 in space is cut out on the first opposing surface 180. The first end portion 80a is inserted through the first groove 185. On the first abutting surface 183, on the first opening 184 side, there are a first claw 186 for positioning the first fitting 83 on the eaves beam 77 and a through hole (not shown) for inserting the screw 78.

[0019] The second fitting 84 has a second opposing surface 190 facing the first fitting 83, a second upper surface 191 facing upward, a second lower surface 192 facing downward, and a second contact surface 193 that abuts against the inner surface 76a of the roof beam 76. The second fitting 84 is closed on the side facing the corner where the roof beam 76 and the eaves girder 77 intersect, and a second opening 194 opens on the opposite side. The second opening 194 is located at the ends of the second opposing surface 190, the second upper surface 191, the second lower surface 192, and the second contact surface 193. The opening dimensions of the second opening 194 in the vertical direction 6 are the same as those of the first opening 184. A second groove 195 is cut out of the second opposing surface 190, which is continuous with the space of the second opening 194. The second end portion 80b is inserted through the second groove 195. On the second contact surface 193, on the side of the second opening 194, there is a second claw 196 for positioning the second fitting 84 on the roof beam 76, and a through hole (not shown) for inserting a screw 78.

[0020] The fire striker body 80 is cylindrical in shape. Right-hand threads in the same direction are formed on the first end 80a and the second end 80b. The first end 80a is fixed by a washer 99 and nut 95 and a washer 100 and nut 96, with the first groove 185 in between. The second end 80b is fixed by a washer 101 and nut 97 and a washer 102 and nut 98, with the second groove 195 in between. In this embodiment, nuts 98 and 97 are objects that are rotated by the rotary tool 10.

[0021] [Rotate Tool 10] The following describes the rotary tool 10 that is attached to the impact driver 90 used when installing the fire striker 79. The rotary tool 10 transmits the rotational force of the impact driver 90 to the fire striker body 80 and nuts 96 and 97.

[0022] As shown in Figures 3 and 5, the rotary tool 10 comprises a main body case 11, an input shaft 12 protruding from the main body case 11, a pair of support members 13, a worm gear 14, a worm wheel 15, and a bag portion 16.

[0023] [Main Case 11] The main body case 11 houses a portion of the input shaft 12, a worm gear 14, a pair of support members 13, and a portion of the worm wheel 15. The main body case 11 is made of synthetic resin or metal. The main body case 11 has a first case 20 and a second case 21.

[0024] The first case 20 rotatably supports the worm wheel 15. As shown in Figures 3 and 4, the first case 20 is constructed in a box shape by having a pair of flat plates 22 abutting against the left and right end faces 5 of the frame 28. Each of the pair of flat plates 22 has the same shape and a main surface that extends along the front-to-back direction 4 and the up-to-down direction 6.

[0025] Each flat plate 22 is generally disc-shaped. A circular cover hole 29 is formed near the center of each flat plate 22, and a guide portion 30 is formed in the cover hole 29 that opens toward the front. The frame 28 is C-shaped, curved to follow the disc-shaped outer contour of the flat plate 22. Each pair of flat plates 22 is fixed by a hexagon socket head bolt 60 and a bolt receiver 61. A worm wheel 15 is housed in the internal space of the first case 20.

[0026] The second case 21 is formed by bending a flat plate into a U-shape. The second case 21 covers the projections 26 and 27 of the first case 20 in an orientation that opens upward, forward, and backward. The second case 21 is connected to the first case 20 by socket head cap screws 62 and bolt receivers 63. The internal space of the second case houses the worm gear 14 and a portion of the input shaft 12.

[0027] A base 31 and a plate-shaped magnet 32 ​​are located on the underside of the second case 21. The plate-shaped magnet 32 ​​is attached to the outer surface of the base 31, and the rotary tool 10 can be magnetically fixed to a metal part when it is attached to the impact driver 90.

[0028] [Input axis 12] As shown in Figures 3 and 5, the input shaft 12 extends inward and outward along the front-to-back direction 4 of the first case 20. The input shaft 12 rotates around a first axis L1 along the front-to-back direction 4 when rotational force is applied from the impact driver 90. The first axis L1 is located in the center of the pair of flat plates 22 in the left-to-right direction 5 (see Figure 3). The input shaft 12 is rotatably supported by a pair of support members 13, which are supported by being sandwiched between the protrusions 26 and 27 of the first case 20, respectively.

[0029] The input shaft 12 has a first end 35 and a second end 36. The first end 35 is located at the rear in the front-rear direction 4 of the input shaft 12 and is outside the main body case 11.

[0030] The first end 35 has a protruding end 37 and a flange 38. The protruding end 37 engages with the output end 91 of the impact driver 90. The protruding end 37 is hexagonal prism-shaped with respect to the first axis L1 and protrudes rearward from the flange 38.

[0031] The flange 38 protrudes outward from the front end of the protruding end 37 around the first axis L1. Six recesses are formed on the rear end surface of the flange 38 around the first axis L1, and cylindrical detachable magnets 40 are fitted into each recess. A cylindrical spacer 39 is positioned between the flange 38 and the support member 13. The cylindrical spacer 39 is located radially outward from the input shaft 12.

[0032] As shown in Figure 5, the second end 36 is located in the internal space of the second case 21. The second end 36 is rotatably supported by a pair of support members 13. A worm gear 14 is located on the second end 36, radially outward from the first axis L1. The worm gear 14 is fixed to the second end 36 via a key member 41. The key member 41 is fitted into a groove 42 formed on the outer circumferential surface of the second end 36. The key member 41 is engaged with the inner circumferential surface 50 of the worm gear 14. The worm gear 14 is fixed to the second end 36 in both the axial and circumferential directions by the key member 41.

[0033] [Worm Gear 14] As shown in Figure 5, the worm gear 14 transmits the rotational force of the input shaft 12 to the worm wheel 15. The worm gear 14 is a mechanism that can significantly reduce rotation in a single stage (one gear meshing), making it possible to reduce the rotational speed of the worm wheel 15 relative to the rotational speed of the input shaft 12.

[0034] The worm gear 14 has a substantially cylindrical shape with the first axis L1 as its axis. A tooth surface 43 that is continuous in a helical shape is formed on the outer surface of the worm gear 14.

[0035] [Worm wheel 15] As shown in Figures 3 and 5, the worm wheel 15 is a spur gear with a notched portion formed therein. Only the portion of the worm wheel 15 that partitions the central hole 54 is made of synthetic resin, while the rest of the worm wheel 15 is made of metal. The worm wheel 15 is sandwiched between a pair of flat plates 22 of the main body case 11. The worm wheel 15 is rotatably supported by the main body case 11. The worm wheel 15 rotates about a second axis L2 (see Figures 3 and 4) which is along the left-right direction 5 parallel to a first virtual straight line perpendicular to the first axis L1. The shortest distance D (see Figure 4) between the first axis L1 and the second axis L2 is about the same as the sum of the radius of the worm gear 14 and the radius of the worm wheel 15. As shown in Figures 6(A) and 7, the worm wheel 15 has a base portion 44, a protrusion 45, an opening 53, a central hole 54, a first through hole 46, and a second through hole 47.

[0036] The base portion 44 is the radially outer part of the worm wheel 15 centered on the second axis L2, and is located between the pair of flat plate members 22. A tooth surface 52 is formed on the outer circumferential surface 51 of the base portion 44. The tooth surface 52 meshes with the tooth surface 43 of the worm gear 14 (see Figure 5).

[0037] The protrusion 45 is the radially inner portion of the worm wheel 15 centered on the second axis L2. In the left-right direction 5, the dimensions of the protrusion 45 are larger than those of the base portion 44. The protrusion 45 protrudes from the first case 20 in the left-right direction 5 (see Figure 4). In the radial direction centered on the second axis L2, the protrusion 45 is located inside the edge 48 of the cover hole 29 (see Figure 3). The outer circumferential surface 49 of the protrusion 45 is slidable relative to the edge 48 of the cover hole 29. A central hole 54, which is shaped like a circular hole with a portion cut out when viewed from the left-right direction 5, is located in the center of the protrusion 45. The central hole 54 is located in the center of the worm wheel 15 when viewed from the left-right direction. The central hole 54 penetrates the protrusion 45 in the left-right direction 5. The worm wheel 15 has an opening 53 that forms a single space continuous with the central hole 54. The opening 53 extends forward from the central hole 54, spanning the base portion 44 and the protruding portion 45.

[0038] The first through-hole 46 is where the first passage 65, which will be described later, is located. As shown in Figures 6(A) and 7, the first through-hole 46 is located on the upper side of the worm wheel 15 and penetrates from the edge 55 to the left surface 45a of the protrusion 45. Specifically, the first through-hole 46 extends upward from the edge 55 through the inside of the protrusion 45, then bends to the left and opens on the left surface 45a.

[0039] The second through-hole 47 is where the second passage 68, described later, is located. The second through-hole 47 is located on the lower side of the worm wheel 15 and penetrates from the edge 55 to the left surface 45a. Specifically, the second through-hole 47 extends downward from the edge 55 through the protrusion 45, bends to the left, and opens on the left surface 45a.

[0040] The opening width E of the opening 53 (see Figure 5) is smaller than the diameter F of the central hole 54. The dimension of the guide portion 30 of the first case 20 along the vertical direction 6 is equivalent to the opening width E. When the worm wheel 15 rotates and the opening 53 aligns with the guide portion 30, the striker body 80 can be inserted into the central hole 54 through the guide portion 30. In other words, the opening width E is set to a size that allows the striker body 80 to be inserted into and removed from the central hole 54, and is set to be larger than the outer diameter of the striker body 80. The opening width E is smaller than the length of the tooth surface 43 along the front-rear direction 4 of the worm gear 14.

[0041] [Bukuro 16] As shown in Figures 6(A), 6(B), and 7, the bag portion 16 expands to grip the striker body 80 and the nut 96 or nut 97. The bag portion 16 is made of a flexible thermosetting elastomer such as rubber or silicone. The bag portion 16 is fixed to the edge 55 of the central hole 54. The bag portion 16 has a surface 56 facing the second axis L2, and this surface 56 contacts the outer circumferential surface 82 of the striker body 80 in the second state. The bag portion 16 has a first passage 65, a pump 66, a check valve (shown as V1 in Figures 4, 6(A), and 6(B)) 67, a second passage 68, a release portion 70, and an on / off valve (shown as V2 in Figures 4, 6(A), and 6(B)) 69. The bag portion 16 is bag-shaped and can store air (an example of a fluid) 72 inside 71. The bag portion 16 is C-shaped when viewed from the left-right direction 5. The outer circumferential surface 110 of the bag portion 16 is bonded to the edge 55 of the central hole 54. When viewed from the left-right direction 5, the bag portion 16 is continuous with the opening 53 at its front end 111. The worm wheel 15 has a second axis L2, which is the center of rotation, that coincides with the center position of the edge 55 in the central hole 54.

[0042] As shown in Figures 6(B) and 7, the first passage 65 is a passage for filling the inside 71 of the bag portion 16 with air 72. The first passage 65 is a pipe that connects the inside 71 and the outside 74 of the bag portion 16. The first passage 65 extends from the upper side of the bag portion 16 through the first through-hole 46. More specifically, the first passage 65 bends at its tip, which extends upward from the upper end of the bag portion 16, and extends further to the left than the left side 45a. The first passage 65 opens at the left end 114 and is connected to the pump 66.

[0043] Pump 66 supplies air 72 from the outside 74 to the first passage 65. Pump 66 extends and retracts in the left-right direction 5. With one retraction, pump 66 can supply air 72 to the inside 71 by the volume of its extended state.

[0044] The check valve 67 is located in the first passage 65 between the pump 66 and the bag portion 16. The check valve 67 opens due to the pressure of the air 72 generated by the operation of the pump 66 and closes due to the pressure of the air 72 filled inside 71. In other words, the check valve 67 allows only the inflow of air 72 in the first passage 65 and prevents the outflow of air 72 to the outside 74.

[0045] The second passage 68 is a passage for discharging air 72 from the inside 71 of the bag portion 16 to the outside 74. The second passage 68 is a pipe that connects the inside 71 and the outside 74 of the bag portion 16. The second passage 68 extends from the bottom of the bag portion 16 through the second through hole 47. More specifically, the second passage 68 bends at its tip, which extends downward from the lower end of the bag portion 16, and extends further to the left than the left side 45a. The second through hole 47 opens at the left end 115.

[0046] The on / off valve 69 is located to the left of the protrusion 45. The on / off valve 69 can be switched on or off by operating the release part 70. When the on / off valve 69 is open, air 72 can flow between the interior 71 and the exterior 74. When the on / off valve 69 is closed, it prevents the flow of air 72 between the interior 71 and the exterior 74.

[0047] When there is air 72 inside 71, the bag portion 16 contracts as the air 72 is expelled when the on / off valve 69 is opened, resulting in a first state as shown by the dashed lines in Figures 6(A) and 7. In the first state, when the on / off valve 69 is closed and air 72 is supplied to the inside 71 by the pump 66, the bag portion 16 expands towards the center of the central hole 54 as the inside 71 is filled with air by the pump 66, resulting in a second state as shown in Figure 6(B). In the second state, the bag portion 16 is in close contact with the outer circumferential surface 82 of the striker body 80, the outer circumferential surface 106 of the nut 96, or the outer circumferential surface 107 of the nut 97, which are located in the central hole 54. In the second state, the bag portion 16 grips the striker body 80 at a position where the axis 87 of the striker body 80 coincides with the second axis L2. The bag portion 16 grips the striker body 80 by being in close contact with the outer circumferential surface 82, generating frictional force. Since the main body 80 of the fire striker is cylindrical, it rotates solely by friction with the bag portion 16. The maximum torque that the rotating tool 10 can exert on the main body 80 is the product of the static friction coefficient of the bag portion 16 with respect to the outer surface 82, the area in contact between the bag portion 16 and the outer surface 82, the average value of the pressure applied from the bag portion 16 to the outer surface 82, and the distance from the axis 87 to the part where the outer surface 82 and the bag portion 16 are in close contact.

[0048] On the other hand, since the nut 96 or nut 97 has a hexagonal outer shape, the bag portion 16 receives localized loads from the six corners of the nut 96 or nut 97. The nuts 96 and nut 97 rotate not only due to the frictional force from their close contact with the bag portion 16, but also because their corners are gripped by the bag portion 16. In other words, the frictional force of the bag portion 16 is maximum at the position where it contacts the six corners of the outer surfaces 106 and 107, and minimum at positions away from the six corners. At this time, the nut 96 or nut 97 can be considered to rotate due to friction with the outer surface of a cylinder of a radius equal to the average distance from the axis 87 of the portion where the outer surface 106 or 107 and the bag portion 16 are in close contact.

[0049] [Installation procedure for the 79-inch flint] The following describes the procedure for installing the bracing body 80 using the rotary tool 10, with the first fitting 83 and the second fitting 84 attached to the eaves beam 77 and the roof beam 76.

[0050] First, the worker places the first end 80a and the second end 80b over the first fitting 83 and the second fitting 84. At this time, as shown in Figure 8(A), the first end 80a is placed with one set of nuts 95 and washers 99 positioned inside the first fitting 83, and the other set of nuts 96 and washers 100 positioned between the first fitting 83 and the fire striker body 80, and then hooked into the first groove 185. Similarly, for the second end 80b, the worker places one set of nuts 98 and washers 102 inside the second fitting 84, and the other set of nuts 97 and washers 101 positioned between the second fitting 84 and the fire striker body 80, and then hooks it into the second groove 195.

[0051] Next, the worker holds the nut 95 located inside the first fitting 83 with the tool 104. This prevents the nut 95 from rotating with the rotation of the striker body 80. The worker then orients the rotating tool 10, which has the opening 53 of the worm wheel 15 aligned with the guide part 30, so that the first axis L1 is perpendicular to the axis 87 of the striker body 80. At this time, the bag portion 16 is in the first state. The worker moves the rotating tool 10 forward so that the striker body 80 moves from the opening 53 to the central hole 54. After confirming that the striker body 80 is in the central hole 54 and the position of the axis 87 is approximately aligned with the second axis L2, the worker supplies air 72 to the interior 71 with the pump 66. As a result, the bag portion 16 in the first state expands to the second state. In the second state, the pressure of the air 72 inside the bag portion 16 becomes higher than atmospheric pressure. In this state, the expanded bag portion 16 comes into close contact with the outer surface 82, so the bag portion 16 grips the outer surface 82 and generates frictional force.

[0052] The operator drives the impact driver 90 in the forward rotation direction while holding the striker body 80 in approximately the center position between the first fitting 83 and the second fitting 84. Here, the forward rotation direction R1 is the direction in which the striker body 80 rotates clockwise when viewed from the right side of the page in Figure 8, and the reverse rotation direction R2 is the opposite direction. The same applies to the rotation direction of the nuts 96 and 97. When the impact driver 90 is driven, the worm wheel 15 rotates, and the striker body 80, which is in close contact with the bag portion 16, rotates in the forward rotation direction R1. As a result, the nut 95 moves closer to the striker body 80. After the operator confirms that the nut 95 has come into contact with the first opposing surface 180 of the first fitting 83 (see Figure 8(B)), the operator stops driving the impact driver 90. The operator removes the tool 104 from the nut 95.

[0053] As shown in Figure 8(B), the operator holds the nut 98 located inside the second fitting 84 with the tool 104. This prevents the nut 98 from rotating together with the rotation of the striker body 80. The operator drives the impact driver 90 in the reverse direction. When the impact driver 90 is driven, the striker body 80 rotates in the reverse direction R2. At this time, the nut 95 rotates together with the striker body 80. This causes the nut 98 to move closer to the striker body 80. After confirming that the nut 98 has come into contact with the second opposing surface 190 of the second fitting 84 (see Figure 8(C)), the operator stops driving the impact driver 90. The operator operates the release part 70 to discharge the air 72 stored inside 71 to the outside 74 through the second passage 68. This causes the bag portion 16 to be separated from the outer surface 82. The worker adjusts the opening 53 to align with the guide section 30, detaches the rotary tool 10 from the fire striker body 80, and removes the tool 104 from the nut 98.

[0054] The operator holds the fire striker body 80 by hand to prevent it from rotating, as shown in Figure 8(C). The operator moves the rotating tool 10 forward so that the nut 96 moves from the opening 53 to the central hole 54. After confirming that the rotation center of the nut 96 roughly coincides with the second axis L2, the operator supplies air 72 to the interior 71 with the pump 66. As a result, the bag portion 16 in the second state comes into close contact with the outer surface 106 of the nut 96.

[0055] The operator drives the impact driver 90 and rotates the nut 96 in the forward rotation direction R1. The nut 96 moves away from the fire striker body 80. After the operator confirms that the first end 80a is secured to the first fitting 83 by the nut 95 and washer 99 and the nut 96 and washer 100 (see Figure 8(D)), the operator stops driving the impact driver 90. The operator operates the release part 70 to expel the air 72 from the inside 71. The operator adjusts the opening 53 to align with the guide part 30 and detaches the rotating tool 10 from the nut 96.

[0056] As shown in Figure 8(D), the operator holds the fire striker body 80 by hand and moves the rotating tool 10 forward so that the nut 97 moves from the opening 53 to the central hole 54. After confirming that the rotation center of the nut 97 roughly coincides with the second axis L2, the operator supplies air 72 to the interior 71 with the pump 66. As a result, the bag portion 16 in the second state comes into close contact with the outer surface 107 of the nut 97.

[0057] The worker drives the impact driver 90 and rotates the nut 97 in the reverse direction R2. The nut 97 moves away from the fire striker body 80. After the worker confirms that the second end 80b is secured to the second fitting 84 by the nut 97 and washer 101 and the nut 98 and washer 102 (see Figure 8(E)), the worker stops driving the impact driver 90. The worker operates the release part 70 to expel the air 72 from the inside 71. The worker adjusts the opening 53 to align with the guide part 30 and disengages the rotating tool 10 from the nut 97. The worker then further tightens the nuts 96 and 97 with the tool 104 to complete the installation of the fire striker 79.

[0058] [Effects of the Embodiment] With the opening 53 of the worm wheel 15 aligned with the guide portion 30 of the first case 20, the striker body 80, nut 96, or nut 97 is inserted from the opening 53 into the central hole 54. When air 72 is filled into the bag portion 16 in the first state by the pump 66, the bag portion 16 expands toward the center of the central hole 54 and enters the second state. In the second state, the flexible bag portion 16 deforms along the outer shape of the striker body 80, nut 96, or nut 97, and adheres tightly to the outer surface 82 of the striker body 80, the outer surface 106 of the nut 96, or the outer surface 107 of the nut 97. Further supply of air 72 can strengthen the adhesion force of the bag portion 16 to the striker body 80, nut 96, or nut 97. When the worm wheel 15 rotates with the bag portion 16 in close contact with the striker body 80 and the nut 96 or nut 97, the rotation of the worm wheel 15 is transmitted to the striker body 80 and the nut 96 or nut 97 due to friction between the bag portion 16 and the outer surface 82, outer surface 106 or outer surface 107, causing them to rotate.

[0059] Since the air 72 can be easily filled into and released from the bag portion 16 by driving the pump 66 and operating the release portion 70, the sealing force of the bag portion 16 against the fire striker body 80, nut 96, or nut 97 can be easily adjusted simply by operating these components.

[0060] [Example 1] In the above-described embodiment, the case was explained using as an example the case in which, when the bag portion 16 is viewed from the left-right direction 5, the second axis L2 which is the rotation center of the worm wheel 15 coincides with the center position of the edge 55 in the central hole 54, but the configuration is not limited to this. For example, as shown in Figure 9(B), the central hole 54A may be arranged such that the bag portion 16A bulges out on the opening 53 side of the fire striker body 80, nut 96 and nut 97, narrowing the opening 53.

[0061] The bag portion 16A has a first portion 160 and a second portion 161. The first portion 160 is the portion of the bag portion 16A that is close to the opening 53. The first portion 160 is located above and below the central hole 54A. More specifically, the first portion 160 is the portion of the bag portion 16A that is located in front of the second axis L2.

[0062] The second portion 161 is located behind the central hole 54A. The second portion 161 is the part of the bag portion 16A that is located behind the second axis L2.

[0063] When viewed from the left-right direction 5, the bag portion 16A has a front end (an example of a first end) 117 at the front tip and a rear end (an example of a second end) 118 at the rear tip. The front end 117 is continuous with the opening 53. The rear end 118 is located on a line perpendicular to the second axis L2 and the vertical direction 6. As shown in Figure 9(A), the dimension D1 from the second axis L2 along the front-rear direction 4 to the front end 117 is greater than the dimension D2 from the second axis L2 to the rear end 118.

[0064] As shown in Figure 9(B), in the second state of the bag portion 16A, the first portion 160 of the bag portion 16 closest to the opening 53 of the worm wheel 15 bulges relatively large on the opening 53 side compared to the striker body 80, nut 96, and nut 97, narrowing the opening 53. At this time, the dimension D3 between the upper first portion 160 and the lower first portion 160 is smaller than the outer diameter D4 of the striker body 80. Dimension D3 is, for example, about half the outer diameter D4 of the striker body 80. This makes it difficult for the striker body 80, nut 96, and nut 97 to come out of the opening 53. Alternatively, the bag portion may bulge to the point where the upper first portion 160 and the lower first portion 160 come into contact.

[0065] [Differentiation 2] In the above-described embodiment, the case in which the bag portion 16 is C-shaped when viewed from the left-right direction 5 was used as an example, but the configuration is not limited to this. The bag portion 16B only needs to be in close contact with the fire striker body 80, nut 96 or nut 97 located in the central hole 54B when it is rotated, and may be divided into multiple parts, for example.

[0066] Specifically, as shown in Figure 10(A), the bag portion 16B has a first portion 120, a third passage 121, and a second portion 122. The edge 55B has a first recess 123, a second recess 124, and a contact portion 125.

[0067] The first recess 123 and the second recess 124 are located on a straight line (an example of a second virtual straight line) M2 that extends vertically 6 through the central hole 54B. The first recess 123 and the second recess 124 are formed in a concave shape relative to the contact portion 125. The first recess 123 is located above the central hole 54B. The first portion 120 is fixed to the first recess 123. The second recess 124 is located below the central hole 54B. The second portion 122 is fixed to the second recess 124. The contact portion 125 is located on the opposite side of the opening 53 with respect to the second axis L2 at its edge 55B.

[0068] The first part 120 is housed in the first recess 123. The first part 120 is connected to a first passage 65, similar to that in the embodiment described above. The configuration of the first passage 65, pump 66, check valve 67, second passage 68, on / off valve 69, and release part 70 of the bag part 16B is the same as that in the embodiment described above, so a description is omitted. When air 72 is supplied to the first part 120, it expands from the first recess 123 toward the center of the central hole 54B, changing from the first state to the second state (see Figure 10(B)).

[0069] The third passage 121 is connected at one end to the first part 120 and at the other end to the second part 122. The third passage 121 connects the first part 120 and the second part 122, allowing air 72 to flow between the first part 120 and the second part 122. The third passage 121 is located inside the worm wheel 15. The third passage 121 is symmetrical to the opening 53 with respect to the second axis L2.

[0070] The second part 122 is housed in the second recess 124. The second part 122 is positioned symmetrically with respect to the first part 120 with respect to the second axis L2. As shown in Figure 10(B), when air 72 is supplied, the second part 122 expands from the second recess 124 toward the center of the central hole 54B, changing from the first state to the second state. The striker body 80, nut 96 or nut 97, positioned in the central hole 54B through the opening 53, is clamped from above and below by the first part 120 and the second part 122, which have entered the second state when air 72 is supplied.

[0071] The contact portion 125 has an arc shape centered on the second axis L2 when viewed from the left-right direction 5. In the second state, the striker body 80 and the nut 96 or nut 97 come into contact with the contact portion 125. Even when the first part 120 and the second part 122 are in the second state, the striker body 80 and the nut 96 or nut 97 are not pushed out from the central hole 54B toward the opening 53, but are held stably near the center of the worm wheel 15. As a result, the striker body 80 and the nut 96 or nut 97 rotate stably without eccentricity relative to the worm wheel 15.

[0072] [Difference 3] In the above-described embodiment, the first end 80a and the second end 80b were described as having right-hand threads and threads formed in the same direction, but the configuration is not limited to this. The first end 80a and the second end 80b may have left-hand threads formed in the same direction, or the threads on the first end 80a and the second end 80b may be formed in different directions.

[0073] In this modified example, the installation procedure for the fire striker 79C, where the threads on the first end 80a are right-hand threads and the threads on the second end 80b are left-hand threads, will be explained with reference to Figure 11. Nuts 95 located inside the first fitting 83 and nuts 98 located inside the second fitting 84 are of a size that fits together so that they do not rotate together with the rotation of the fire striker body 80C.

[0074] First, the worker attaches the washer 100 and nut 96 to the first end 80a and the washer 101 and nut 97 to the second end 80b, and then places the fire striker body 80C over the first fitting 83 and the second fitting 84. Next, as shown in Figure 11(A), the worker temporarily fastens the washer 99 and nut 95 to the first end 80a located inside the first fitting 83. The worker also temporarily fastens the washer 102 and nut 98 to the second end 80b located inside the second fitting 84.

[0075] The operator positions the fire striker body 80C into the central hole 54 of the rotary tool (not shown). The operator uses the pump 66 to bring the bag portion 16 to the second state, making the bag portion 16 tightly contact with the outer surface 82. The operator drives the impact driver 90 in the forward rotation direction R1. This causes the fire striker body 80C to rotate in the forward rotation direction R1, and nuts 95 and 98 move closer to the fire striker body 80C. As a result, nut 95 comes into contact with the first fitting 83 and nut 98 comes into contact with the second fitting 84 (see Figure 11(B)). The operator stops driving the impact driver 90 and returns the bag portion 16 to the first state, and then detaches the rotary tool 10 from the fire striker body 80C.

[0076] The operator holds the fire striker body 80C by hand, as shown in Figure 11(B). The operator 10 positions the nut 96 in the central hole 54 of the rotary tool 10. The operator uses the pump 66 to bring the bag portion 16 to the second state, making the bag portion 16 tightly contact with the outer surface 106. The operator drives the impact driver 90 in the forward rotation direction R1. This causes the nut 96 to rotate in the forward rotation direction R1, moving away from the fire striker body 80C. The nut 96 comes into contact with the first fitting 83 (see Figure 11(C)). The operator stops driving the impact driver 90 and returns the bag portion 16 to the first state, then detaches the rotary tool 10 from the nut 96.

[0077] As shown in Figure 11(C), the worker holds the fire striker body 80C by hand and positions the nut 97 in the central hole 54 of the rotary tool. The worker uses the pump 66 to bring the bag portion 16 to the second state, making it tightly contact with the outer surface 107. The worker drives the impact driver 90 in the forward rotation direction R1. This causes the nut 97 to rotate in the forward rotation direction R1, moving it away from the fire striker body 80C. The nut 97 comes into contact with the second fitting 84 (see Figure 11(D)). The worker stops driving the impact driver 90 and returns the bag portion 16 to the first state, then detaches the rotary tool 10 from the nut 97. In this state, the worker further tightens the nuts 96 and 97 with the tool 104 to complete the installation of the fire striker 79C.

[0078] [Other variations] In the above-described embodiment, the example given was that the fire striker body 80 is cylindrical, but the configuration is not limited to this. The fire striker body 80 may be a rectangular prism or a hexagonal prism, or it may be a turnbuckle or the outer shape of the cross-section may be elliptical.

[0079] In the embodiments described above, the bag portion 16 has a surface 56 facing the second axis L2, and the bag portion 16 is described as being made of a flexible thermosetting elastomer such as rubber or silicone, but it is not limited to this. For example, the bag portion 16 may be made of nylon or polyethylene terephthalate (PET), and a material with a higher coefficient of friction than nylon, such as rubber or silicone, may be used on the surface 56 of the bag portion 16.

[0080] In the above-described embodiment, the case in which the bag portion 16 has a pump 66 was explained as an example, but the configuration is not limited to this. The bag portion 16 may not have a pump 66. For example, the bag portion 16 may be filled with air 72 inside 71 by connecting a compressor to the first passage 65 with the on / off valve 69 of the second passage 68 closed.

[0081] In the above-described embodiment, the case in which the main body case 11 has a first case 20 and a second case 21 was used as an example, but the configuration is not limited to this. The first case 20 and the second case 21 may be formed integrally.

[0082] In the above-described embodiment, the worm wheel 15 was explained using the example where only the portion defining the central hole 54 is made of synthetic resin, and the rest is made of metal, but the configuration is not limited to this. The worm wheel 15 may be made of metal only in the portion defining the central hole 54, or the entire worm wheel may be made of synthetic resin or metal.

[0083] In the above-described embodiment, the case in which the bag portion 16 is bonded to the edge 55 of the central hole 54 on the outer peripheral surface 110 was given as an example, but the configuration is not limited to this. The bag portion 16 only needs to be fixed to the edge 55, and for example, it may be locked to the edge 55.

[0084] In the above-described embodiment, the first passage 65 is arranged through the first through-hole 46 and the second passage 68 is arranged through the second through-hole 47 as an example, but the configuration is not limited to this. The first passage 65 and the second passage 68 may be arranged without passing through the worm wheel 15, and for example, they may extend to the left from the left-facing surface of the bag portion 16, or to the right from the right-facing surface.

[0085] In the above-described embodiment, a check valve 67 was explained that only allows the inflow of air 72 into the interior 71. However, the check valve (not shown) may specifically consist of an elastic membrane that flexes due to the inflow of air 72 by the pump 66, thereby opening the first passage 65. In this case, the check valve closes the first passage 65 when it is not subjected to pressure from the interior 71 and the exterior 74, or when the bag portion 16 is filled with air 72 and is subjected to pressure from the interior 71.

[0086] In the above-described embodiment, an on / off valve 69 that can be switched on or off by operating the release part 70 has been described, but the configuration is not limited to this. The bag portion 16 may not have a release part 70. For example, the on / off valve 69 and the second passage 68 may be elastic members, and the on / off valve 69 may be located inside the second passage 68 to prevent the flow of air 72 from the inside 71 to the outside 74. The on / off valve 69 deforms when subjected to external force together with the second passage 68, creating a gap between it and the second passage 68 and connecting the inside 71 and the outside 74.

[0087] [Note 1] The main case and The first end protrudes from the main body case, and the first end engages with the output end of the electric rotary tool, forming an input shaft that rotates around a first axis. A worm gear located at the second end opposite to the first end of the input shaft and housed in the main body case, A worm wheel having an opening that forms a single space continuous with the central hole, and rotating about a second axis parallel to a first virtual straight line perpendicular to the first axis of the input shaft, It comprises a flexible, bag-shaped portion fixed to the edge of the central hole, The worm wheel described above is rotatably supported by the main case and meshes with the worm gear described above. The above-mentioned bag portion is a rotating tool that can be deformed between a first state in which the fluid is discharged and the bag contracts, and a second state in which the fluid is filled and the bag expands toward the center of the central hole.

[0088] [Note 2] The bag portion described above has a first passage and a second passage that communicate the inside of the bag portion with the outside, A pump that supplies the above fluid to the first passage, A check valve located in the first passage described above, through which the fluid flows only from the outside to the inside, The rotary tool according to Appendix 1, further comprising an on / off valve located in the second passage and capable of switching the flow and blocking of the fluid between the outside and the inside.

[0089] [Note 3] The rotary tool according to Appendix 1 or 2, wherein, when viewed from a direction along the second axis, the distance from the second axis toward the opening in the direction from the second axis to the first tip located at the tip of the bag portion is greater than the distance from the second axis toward the tip of the bag portion in the direction opposite to the opening in the direction from the second axis.

[0090] [Note 4] The bag portion has a first part, a second part, and a third passage that allows the fluid to flow between the first part and the second part. The first part described above is located on a second virtual straight line perpendicular to the direction from the central hole toward the opening and the second axis, The second part described above is a rotation tool as described in Appendix 1 or 2, located symmetrically to the first part with respect to the second axis. [Explanation of symbols]

[0091] 10. Rotation Tool 11. Main unit case 12...Input axis 14. Worm gear 15...Worm wheel 16...Fukuro part 35...1st end 36...2nd end 53...Aperture 54...center hole 55...Rim of the central hole 65...1st aisle 66... ​​pump 67. Check valve 68...2nd aisle 69... On / Off Valve 71...Inside of the bag 72. Air (fluid) 74...external 90...Impact driver (electric rotary tool) 91...Output terminal 117...Front end (first tip) 118...Rear end (second tip) 120...Part 1 121...3rd aisle 122...Part 2

Claims

1. The main case and The first end protrudes from the main body case, and the first end engages with the output end of the electric rotary tool, forming an input shaft that rotates around a first axis. A worm gear located at the second end opposite to the first end of the input shaft and housed in the main body case, A worm wheel having an opening that forms a single space continuous with the central hole, and rotating about a second axis parallel to a first virtual straight line perpendicular to the first axis of the input shaft, It comprises a flexible, bag-shaped portion fixed to the edge of the central hole, The worm wheel described above is rotatably supported by the main case and meshes with the worm gear described above. The bag portion described above is deformable between a first state in which the fluid is discharged and the bag contracts, and a second state in which the fluid is filled and the bag expands toward the center of the central hole. A rotary tool in which, when viewed from a direction along the second axis, the distance from the second axis toward the opening in the direction from the second axis to the first tip located at the tip of the bag portion is greater than the distance from the second axis toward the tip of the bag portion in the direction opposite to the opening in the direction from the second axis to the second tip located at the tip of the bag portion.

2. A main body case, The first end protrudes from the main body case, and the first end engages with the output end of the electric rotary tool, forming an input shaft that rotates around a first axis. A worm gear located at the second end opposite to the first end of the input shaft and housed in the main body case, A worm wheel having an opening that forms a single space continuous with the central hole, and rotating about a second axis parallel to a first virtual straight line perpendicular to the first axis of the input shaft, It comprises a flexible, bag-shaped portion fixed to the edge of the central hole, The worm wheel described above is rotatably supported by the main case and meshes with the worm gear described above. The bag portion described above is deformable between a first state in which the fluid is discharged and the bag contracts, and a second state in which the fluid is filled and the bag expands toward the center of the central hole. The bag portion has a first part, a second part, and a third passage that allows the fluid to flow between the first part and the second part. The first part described above is located on a second virtual straight line perpendicular to the direction from the central hole toward the opening and the second axis, The second part described above is a rotation tool positioned symmetrically to the first part with respect to the second axis described above.

3. The bag portion comprises a first passage and a second passage that communicate the inside of the bag portion with the outside, A pump that supplies the above fluid to the first passage, A check valve located in the first passage described above, through which the fluid flows only from the outside to the inside, The rotary tool according to claim 1 or 2, further comprising an on / off valve located in the second passage and capable of switching the flow and blocking of the fluid between the outside and the inside.

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