Slat crimping jig, electric screwdriver equipped therewith, method for crimping slat ends, and method for releasing crimping.

Abstract

This invention provides a slat crimping jig that allows for easy and quick crimping of slats without requiring strong gripping force, an electric screwdriver equipped with the jig, and a method for crimping the ends of slats. [Solution] The slat crimping jig 1A of the present invention has a connecting portion 2 having an insertion portion 2a that is inserted into the body of an electric screwdriver, and a crimping portion 3A formed on the tip side of the connecting portion 2, which is inserted into the lower end of the shutter slat that is curled to receive the upper end of the shutter slat, and which contracts the lower end of the shutter slat.

Description

Technical Field

[0001] The present invention relates to a slat caulking jig, an electric driver provided with the same, a caulking method for a slat end portion, and a caulking release method.

Background Art

[0002] A shutter for opening and closing the inside and outside of a building or site is formed by connecting slats made of steel plates. The slats constituting the shutter are formed in a strip shape having a longitudinal dimension in the horizontal direction, an engaging upper end portion is provided on the long side facing upward, and an engaged lower end portion curled so as to be hung on the engaging upper end portion is provided on the long side facing downward. The engaging upper end portion is formed leaving both ends in the longitudinal direction of the slat by a predetermined dimension, and the engaged lower end portion is formed over both ends in the longitudinal direction of the slat. When assembling the shutter with slats, the engaging upper end portion of the next slat is hung on the engaged lower end portion of one slat to align both ends of the slats. Then, both ends of the engaged lower end portion where the engaging upper end portion does not exist are caulked, the engaging upper end portion is positioned inside both ends of the deformed engaged lower end portion, and the slats are prevented from shifting in the horizontal direction. The caulking operation of both end portions of the engaged lower end portion was performed by crushing the curled engaged lower end portion using pliers.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Since the slat is a steel plate having a predetermined rigidity, and some of them have very high rigidity, a considerable gripping force is required to crush the engaged lower end portion using pliers. In addition, since the number of slats constituting the shutter is large and the caulking portions are twice that number, it takes time to surely deform the engaged lower end portion by a certain degree or more, and variations in deformation occur due to fatigue during the work. Therefore, the present invention provides a slat crimping jig that does not require strong gripping force and allows for simple and quick crimping of slats, an electric screwdriver equipped with the jig, a method for crimping the ends of slats, and a method for releasing the crimping. [Means for solving the problem]

[0004] The slat crimping jig of the present invention has a connecting portion having an insertion portion that is inserted into the body of an electric screwdriver, and a crimping portion formed on the tip side of the connecting portion, which is inserted at least a part into the lower end of the shutter slat that is curled to receive the upper end of the shutter slat, and which contracts the lower end of the shutter slat. With this configuration, the lower end of the slat crimping tool can be crimped by contracting the curl of the lower end of the slat that is to be engaged through rotation.

[0005] The connecting portion of the slat crimping jig of the present invention has a flange portion at its tip that protrudes radially from the central axis, and the crimping portion may be formed in a plate shape with corners, surrounded by the outer circumferential surface of the flange portion and / or a surface that smoothly continues in the direction of protrusion from the tip surface. With this configuration, the crimped portion is formed by a smoothly continuous surface with respect to the flange portion, thus preventing stress from concentrating at specific points in the crimped portion.

[0006] In the slat crimping jig of the present invention, a notch is formed in the widthwise middle portion of the crimping portion, extending in the direction of the protrusion of the crimping portion, and dividing shaft portions are formed on both sides of the notch. The dividing shaft portions on both sides may be formed such that one of them is inserted into the engaged lower end and the other is positioned outside the engaged lower end, so as to be able to grip the engaged lower end by sandwiching it in its thickness direction. With this configuration, the lower end to be engaged is clamped and crimped by the split shaft portion, allowing for more reliable crimping.

[0007] The tip of the connecting portion of the slat crimping jig of the present invention is provided with a flange portion that extends radially from its central axis, and the dividing shaft portions on both sides may be formed in a rod shape having corners, surrounded by the outer circumferential surface of the flange portion and / or a surface that smoothly continues in the direction of projection from the tip surface. With this configuration, since the divided shaft portion is formed by a smoothly continuous surface with respect to the flange portion, it is possible to avoid stress concentration at specific points on the divided shaft portion.

[0008] The notch of the slat crimping jig of the present invention may be formed with a constant width dimension from the tip, and then smoothly curve and narrow at the base end of the dividing shaft portion. This configuration prevents stress from concentrating near the base end of the divided shaft portion due to the notch in the crimped portion.

[0009] The inner corners of the tips of the split shaft portions on both sides of the slat crimping jig of the present invention may be chamfered. This configuration makes it easier to introduce the engaged lower end into the notch between the divided shaft sections.

[0010] The electric screwdriver of the present invention has the slat crimping jig described in any one of the above attached to the electric screwdriver body. With this configuration, the rotation of the slat crimping jig, which would normally require a great deal of force to operate manually, can be easily performed using the electric screwdriver body.

[0011] The method for crimping the end of a slat includes the steps of: inserting at least a portion of the crimping part of a slat crimping jig into the lower end of a shutter slat that has been curled to receive the upper end of the shutter slat; and driving the electric screwdriver body while the crimping part is engaged with the lower end of the shutter slat to rotate the slat crimping jig in the same direction as the curl direction of the lower end of the shutter slat. With this configuration, the deformation caused by the contraction of the engaged lower end, which is subjected to considerable force manually, can be easily controlled by the electric screwdriver body.

[0012] A method for releasing the crimping of the slat end comprises the steps of: inserting at least a portion of the crimping part of a slat crimping jig into the lower end of a shutter slat that is curled to receive the upper end of the shutter slat; and driving the electric screwdriver body while the crimping part is engaged with the lower end of the shutter slat to rotate the slat crimping jig in the opposite direction to the curl of the lower end of the shutter. With this configuration, the contracted crimp at the lower end of the engaged part, which is subjected to considerable force manually, can be easily released using the electric screwdriver body. [Effects of the Invention]

[0013] The slat crimping jig, the electric screwdriver equipped therewith, and the crimping and uncrimping methods for slat ends of the present invention offer the advantages of being simple, quick, and stable. [Brief explanation of the drawing]

[0014] [Figure 1] (a) A cross-sectional view showing the connection of slats constituting a shutter in which the present invention is used. (b) A front view showing a part of the slats in (a). [Figure 2] This is a perspective view illustrating the body of the electric screwdriver according to the present invention. [Figure 3] (a) A plan view showing a slat crimping jig according to the first embodiment of the present invention. (b) A side view showing a slat crimping jig according to the first embodiment of the present invention. [Figure 4] This is a perspective view showing a slat crimping jig according to the first embodiment of the present invention. [Figure 5] This is a perspective view showing the slat crimping jig of the first embodiment of the present invention positioned at the lower end of the slat to be engaged. [Figure 6] (a) A plan view showing a slat crimping jig according to a second embodiment of the present invention. (b) A side view showing a slat crimping jig according to a second embodiment of the present invention. [Figure 7]A diagram showing the process of caulking the engaged lower end portion using the caulking jig for the second embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. Note that the dimensions of each part of the drawings used in the following description are not necessarily the same as the actual ones and can be changed as appropriate.

[0016] First, an outline of the shutter 100 to which the present invention is applied and the slats 101 constituting the same will be described. As shown in FIGS. 1(a) and 1(b), the shutter 100 to which the present invention is applied is designed according to the width of an opening (not shown) of a building such as a door provided on the outer wall of a parking lot of a house or building, and is configured by connecting horizontally long strip-shaped slats 101.

[0017] The slat 101 is formed by processing a steel plate, and has a flat plate portion 102 constituting the surface of the shutter 100, an engaged upper end portion 103 formed at the upper end of the flat plate portion 102, and an engaged lower end portion 104 formed at the lower end of the flat plate portion 102. [[ID=第十九]]

[0018] The engaged upper end portion 103 of the present embodiment is formed by bending from the upper end edge of the flat plate portion 102 toward the inner surface side (i.e., the inside of the building), and then curling upward and outward so that the leading edge faces downward. <固定上端部103は、平板部102の両端から所定寸法(一般的には数センチ程度)の領域を除いて、平板部102の長手方向(即ち水平方向)に連続して延在している。係合上端部103の両端が切り欠かれた上記所定寸法の領域は、係合上端部103が存在しないかしめ配置部105になっている。

[0019] ​The shape of the engaging upper end 103 can vary, and in addition to the example shown in this embodiment, there are also shapes that do not curl and instead lock into the engaged lower end 104, but the shape of the engaging upper end 103 is not a requirement for the slat 101 to which the present invention applies.

[0020] The shape of the engaged lower end portion 104 is typically formed by bending inward from the lower edge of the flat plate portion 102, then bending outward again to form a roughly V-shape (groove), and then curling downward inward so that the tip edge points upward. The engaged lower end portion 104 extends continuously in the longitudinal direction across both ends of the flat plate portion 102.

[0021] The slats 101 are connected in such a way that the tip of the curl of the engaging upper end 103 of one slat 101 is placed inside the curl of the engaged lower end 104 of the other slat 101, so that the engaged lower end 104 receives the engaging upper end 103 from below.

[0022] When the slats 101 are connected to each other and both ends of the flat plate portion 102 are aligned, both ends of the engaged lower end portion 104 where the crimped arrangement portion 105 of the other slats 101 is located become crimped portions 106 that can prevent the movement of the engaged upper end portion 103 when crimped. A notch (not shown) of a predetermined width is formed between the crimping portions 106, 106 located at both ends of the engaged lower end 104 and the wall portion of the engaged lower end 104 between them, separating them except for the base end of the curl of the engaged lower end 104. This separates the crimping portions 106, 106 from the wall portion between them, making crimping easier.

[0023] While the engaged lower end portion 104 can have various shapes other than those exemplified herein, most are shaped so that the engaged upper end portion 103 can be hooked onto it by curling. Therefore, the present invention focuses on slats 101 having at least a curled engaged lower end portion 104.

[0024] Next, an electric screwdriver and a slat crimping jig according to the first embodiment of the present invention will be described. As shown in Figure 2, the electric screwdriver of the present invention is configured by attaching the slat crimping jig 1A of the present invention to a known electric screwdriver body X1. As shown in Figures 3(a), (b) and 4, the slat crimping jig 1A mainly consists of a connecting part 2 having an insertion part 2a that is inserted into the insertion port h (generally a hole into which a bit is inserted) of the electric screwdriver body X1 shown in Figure 2, and a crimping part 3A formed on the tip side of the connecting part 2.

[0025] The crimped portion 3A is a part that is inserted into the engaged lower end portion 104 of the slat 101, at least in part, to contract the engaged lower end portion 104. The connecting portion 2 has an insertion portion 2a that is inserted into the electric screwdriver body X1 (not shown), and a body portion 2b formed on the tip side of the insertion portion 2a. The insertion portion 2a is not particularly limited as long as it is formed to conform to the specifications of the insertion port h that can be attached to a known electric screwdriver body. In this embodiment, a hexagonal shaft type is exemplified.

[0026] The body portion 2b is formed in the shape of a cylinder with a perfectly circular cross-section that perfectly accommodates the hexagonal cross-section of the insertion portion 2a. The body portion 2b has a flange portion 4 that protrudes radially outward from its tip surface.

[0027] The flange portion 4 has a tapered portion 4a that gradually widens in diameter from the tip surface of the body portion 2b, and a cylindrical portion 4b that is formed with a constant diameter. The crimped portion 3A protrudes in the axial direction L from the tip surface 4s of the flange portion 4.

[0028] The crimped portion 3A has a tip portion 5A formed to be approximately the same width as the diameter of the flange portion 4 and to be approximately the same thickness as the diameter of the flange portion 4, and a base portion 6 which is approximately the same width as the diameter of the flange portion 4 and whose thickness smoothly increases from the tip portion 5A. The crimped portion 3A is formed as a generally flat plate shape.

[0029] The tip portion 5A has a shape in which a notch of approximately constant width is cut out in the center of the width direction of a steel plate of approximately constant thickness. The notch 7 penetrates in the thickness direction. Due to the notch 7 extending in the width direction of the tip portion 5A, two divided shaft portions 8, 8 having the same thickness and approximately the same width are formed on both sides of the notch 7 in the tip portion 5A.

[0030] The two dividing shaft portions 8, 8 are formed symmetrically with respect to the notch 7. In detail, the divided shaft portion 8 mainly has an outer peripheral surface 11 that extends in the protruding direction with approximately the same curvature as the circumferential surface of the cylindrical portion 4b of the flange portion 4, flattened forming surfaces 12, 12 that bend from both side edges of the outer peripheral surface 11 and continue in the short direction (i.e., the width direction), extending parallel to each other, an inner surface 13 that forms the notch 7, and a tip surface 14.

[0031] The outer circumferential surface 11 extends smoothly and continuously in the protruding direction from the opposing arcs c1 of the flange portion 4, with the same curvature as the circumferential surface of the cylindrical portion 4b, gradually decreasing in length in the circumferential direction, and then further extends smoothly and continuously in the protruding direction with the same curvature along a constant arc c2.

[0032] As shown in Figure 3(b), the flattened surfaces 12,12 extend in the protruding direction from the tip surface 4s or tip outer edge 4c of the flange portion 4 toward the axis L, forming a curved surface 12a that narrows with a constant curvature, after which a flat surface 12b extends smoothly and continuously. The flat surface 12b is formed with a substantially constant width dimension except for the curved base end side.

[0033] The inner surface 13 is formed by a flat surface 13a that is cut straight perpendicular to the flattening surface 12 and a curved surface 13r that forms a radius in the width direction near the base end 6. The tip surface 14 is formed in a roughly rectangular shape when viewed from the front, with the surface perpendicular to the axis L. The corner between the tip surface 14 and the inner surface 13 is chamfered at an angle of approximately 45°, although this angle is not particularly limited.

[0034] In this way, the dividing shaft portion 8 is formed in a roughly prism shape, with its outer surface 11 being slightly curved, but with corners formed between the surfaces. Furthermore, the cross-sectional shape perpendicular to the axis L of the dividing shaft portion 8 is not limited, but in this embodiment, the width dimension of the flattened surface 12 is the longer side, and the thickness dimension is the shorter side.

[0035] The opposing inner surfaces 13, 13 of the divided shaft portions 8, 8 extend parallel to each other from the chamfered portion K1 toward the base end portion 6, and then curve in an arc shape toward each other in the vicinity of the base end portion 6. In other words, the notch 7 is formed with a certain width on the base end portion 6 side of the chamfered portion K1, and then narrows in an arc shape in the vicinity of the base end portion 6.

[0036] In the above configuration, the base portion 6 constitutes a region in the axial direction L that forms a curved surface 12a from arc c1 to arc c2, where the arc begins to become smaller than the cylindrical portion 4b of the flange portion 4, and the tip portion 5A constitutes a plate-like portion with a constant thickness at the tip, compared to the base portion 6. The slat crimping jig 1A is symmetrical with respect to the axis L in both plan view and side view, and can be formed by machining a highly rigid cylindrical metal to achieve the above shape.

[0037] Next, we will explain how to use the slat crimping jig 1A described above. When crimping both ends of the engaged lower end 104 of the connected slats 101 using the slat crimping jig 1A, the ends of the flat plate portions 102 of the vertically connected slats 101 are aligned, as shown in Figures 1(a) and (b). This ensures that the crimped position portion 105 of the lower slat 101 coincides with the crimped portions 106 at both ends of the engaged lower end 104 of the upper slat 101.

[0038] Furthermore, insert the insertion part 2a of the connecting part 2 of the slat crimping jig 1A into the insertion port h of the electric screwdriver body X1 and secure it firmly. As shown in Figure 5, one of the split shaft portions 8 of the slat crimping jig 1A is inserted from the open end of the engaged lower end portion 104 of the upper slat 101, and the engaged lower end portion 104 is inserted relative to the split shaft portions 8, 8, so that the curled tip side of the engaged lower end portion 104 is sandwiched between the two split shaft portions 8, 8. Note that for the sake of clarity, Figure 5 only shows the crimped portion 106 of the engaged lower end portion 104 and the tip portion 5B of the crimped portion 3A.

[0039] Once the split shaft portion 8 is inserted into the curl of the engaged lower end portion 104, the electric screwdriver body X1 shown in Figure 2 is driven to rotate the slat crimping jig 1A around the axis L in the direction of the curl of the engaged lower end portion 104 (direction of the arrow in Figure 5).

[0040] As a result, the corner p1 on the rotational side of the divided shaft portion 8 (hereinafter referred to as "inner divided shaft portion 8") inserted inside the engaged lower end portion 104, or its vicinity, comes into contact with the inner surface of the engaged lower end portion 104. The slat crimping jig 1A rotates using the point where the inner divided shaft portion 8 and the inner surface come into contact as a pivot point, and the corner p2 of the outer divided shaft portion 8, located diagonally opposite corner p1, presses against the outer surface of the engaged lower end portion 104. This results in the engaged lower end portion 104 being gripped by the inner and outer divided shaft portions 8.

[0041] As the electric screwdriver body X1 is driven, the slat crimping jig 1A rotates further, causing the crimping portion 3A to rotate while gripping the engaged lower end portion 104. As a result, the tip of the engaged lower end portion 104 is drawn inward, and by driving the electric screwdriver body X1 for only 1 to a few seconds, the end portion of the engaged lower end portion 104 located at the crimping position portion 105 is reliably contracted and deformed.

[0042] Thus, the slat crimping jig 1A of the present invention and the electric screwdriver to which it is attached have the effect of being able to crimp the crimped portion 106 of the engaged lower end 104 of the shutter 100, which is made of a highly rigid steel plate, very easily and quickly.

[0043] Furthermore, since the electric screwdriver body X1 can be used, anyone can easily crimp the engaged lower end 104 regardless of their grip strength. Therefore, although it is necessary to crimp many slats 101 to assemble the shutter 100, fatigue is less likely to occur even after crimping many places, and crimping can be performed stably (i.e., the same degree of crimping can be achieved at all places).

[0044] Furthermore, in the crimping method using an electric screwdriver with the slat crimping jig 1A attached, the force required to deform the engaged lower end portion 104 is applied to the crimped portion 3A in the rotational direction. However, the slat crimping jig 1A has a flange portion 4 with a larger diameter than the connecting portion 2, the crimped portion 3A is formed with approximately the same width as the tip surface of the flange portion 4, and the base end portion 6 of the crimped portion 3A is formed in a shape that is smoothly curved from the tip surface 4s of the flange portion 4. Therefore, the stress applied to the crimped portion 3A can be distributed, and damage to the slat crimping jig 1A caused by stress concentration in one place can be suppressed.

[0045] Furthermore, by cutting out an arc shape between the divided shaft portions 8, 8 on the base end portion 6 side, stress concentration on the inner base end of the divided shaft portion 8 is avoided, effectively preventing the divided shaft portion 8 from breaking near the base end portion 6.

[0046] Furthermore, the chamfered inner tip of the divided shaft portion 8 makes it easier to introduce the engaged lower end portion 104 into the notch 7.

[0047] Next, a second embodiment of the present invention will be described with reference to Figures 6 and 7. In this embodiment, the configurations that differ from the first embodiment will be mainly described, and common components will be denoted by the same reference numerals and their descriptions will be omitted.

[0048] As shown in Figures 6(a) and 6(b), the slat crimping jig 1B of the second embodiment differs from the tip 5A of the slat crimping jig 1A of the first embodiment in the configuration of the tip 5B of the crimping portion 3B, while the other configurations are the same as those of the first embodiment.

[0049] The tip portion 5B of the slat crimping jig 1B is formed in a roughly trapezoidal shape that tapers towards the tip in a plan view, and in a side view, it tapers towards the tip at a substantially constant angle. Unlike the tip portion 5A of the first embodiment, the tip portion 5B does not have a notch 7 at a predetermined position in the width direction, and is formed as a single flat plate. The tip portion 5B is formed in a rectangular cross-section, and the longer side of the rectangular cross-section is made larger than the minimum inner dimension passing through the center of the opening of the crimping portion 106, and is formed in such a way that the tip portion 5B is inserted into the curl.

[0050] When crimping the engaged lower end 104 of the slat 101 using an electric screwdriver with the slat crimping jig 1B attached, as shown in Figure 7, the tip 5B is inserted into the curl of the engaged lower end 104, a part of the tip 5B is placed against the inner surface of the engaged lower end 104, and the electric screwdriver body X1 is driven.

[0051] When the slat crimping jig 1B begins to rotate due to the drive of the electric screwdriver body X1, one end b1 in the width direction of the tip 5B engages with the base of the engaged lower end 104 and becomes a fulcrum. Subsequently, with a slight rotation of the slat crimping jig 1B, the other end b2 in the width direction of the tip 5B further engages with the tip of the engaged lower end 104 and becomes a point of application, allowing it to rotate together with the engaged lower end 104. Then, by continuing to rotate the slat crimping jig 1B, the engaged lower end 104 can be wrapped around and contracted, and crimped.

[0052] Thus, even with an electric screwdriver using the slat crimping jig 1B, the engaged lower end 104 can be easily and quickly crimped with very little force, almost the same as in the case of the slat crimping jig 1B of the first embodiment. Furthermore, since the slat crimping jig 1B is formed in a trapezoidal shape that tapers towards the tip, inserting the crimping part 5B until it firmly engages with the inner surface of the crimping part 106 makes it easier to accommodate differences in the curl shape and size of the crimping part 106.

[0053] Furthermore, when disassembling the shutter 100 by unfastening the slats 101, the slat riveting jigs 1A and 1B can be reinserted into the riveted portion of the engaged lower end 104 and rotated in the opposite direction to the riveting, i.e., the curl direction of the engaged lower end 104, to release the riveting very easily and quickly.

[0054] In the first embodiment described above, the tip portion 5A was shown to be formed with a substantially constant width and thickness from the base end to the tip, but the tip portion 5A may be configured to taper from the base end to the tip. Furthermore, in the second embodiment, an example was shown in which the tip portion 5B is tapered from the base end to the tip, but the tip portion 5B may be formed with a substantially constant width and thickness from the base end to the tip. [Explanation of Symbols]

[0055] 1A, 1B Slat crimping jig 2 Connecting part 2a Insertion part 3A, 3B crimping section 4. Flange section 5A,5B Tip 6 Proximal end 7 Notches 100 shutters 101 Slats 103 Engagement upper end 104 Engaged lower end 106 Crimped portion K1 Chamfered section

Claims

1. A connecting part having a socket that is inserted into the main body of an electric screwdriver, A slat crimping jig having a crimping portion formed on the tip side of the connecting portion, which is inserted at least a portion into the lower end of the shutter slat that is curled to receive the upper end of the shutter slat, and which contracts the lower end of the shutter slat.

2. The aforementioned connecting portion has a flange portion at its tip that protrudes radially from the central axis, The slat crimping jig according to claim 1, wherein the crimping portion protrudes from the tip surface side of the flange portion, is surrounded by the outer circumferential surface of the flange portion and / or a surface that is smoothly continuous in the direction of protrusion from the tip surface, and is formed in a plate shape having corners.

3. A notch is formed in the middle of the crimped portion in the width direction, extending in the direction of the protrusion of the crimped portion. Dividing shaft portions are formed on both sides of the aforementioned notch. The slat crimping jig according to claim 1, wherein the two dividing shaft portions on both sides are formed such that one of them is inserted into the engaged lower end and the other of them is positioned outside the engaged lower end, so as to be able to grip the engaged lower end by sandwiching it in its thickness direction.

4. The tip of the connecting portion is provided with a flange portion that extends radially from its central axis. The slat crimping jig according to claim 3, wherein the two dividing shaft portions on both sides protrude from the tip surface side of the flange portion, are surrounded by the outer circumferential surface of the flange portion and / or surfaces that smoothly continue in the direction of protrusion from the tip surface, and are formed in a rod shape having corners.

5. The slat crimping jig according to claim 4, wherein the notch is formed from the tip to a certain width dimension, and then smoothly curves and narrows at the base end of the divided shaft portion.

6. The slat crimping jig according to claim 4, wherein the inner corners of the tips of the split shaft portions on both sides are chamfered.

7. An electric screwdriver having a slat crimping jig according to any one of claims 1 to 6 attached to the electric screwdriver body.

8. Using the electric screwdriver described in claim 7, which references claim 1 or claim 2, A step of inserting at least a portion of the crimping part of a slat crimping jig into the lower end of the shutter slat, which is curled to receive the upper end of the shutter slat, A method for crimping the end of a slat, comprising the steps of: driving the electric screwdriver body while the crimping portion is engaged with the lower end to be engaged, and rotating the slat crimping jig in the same direction as the curl direction of the lower end to be engaged.

9. Using the electric screwdriver described in claim 7, which references claim 1 or claim 2, A step of inserting at least a portion of the crimping part of a slat crimping jig into the lower end of the shutter slat, which is curled to receive the upper end of the shutter slat, A method for releasing the crimping of a slat end, comprising the steps of: driving the electric screwdriver body while the crimping portion is engaged with the lower end to be engaged, and rotating the slat crimping jig in the direction opposite to the curl direction of the lower end to be engaged.

10. Using the electric screwdriver according to claim 7, which references any one of claims 3 to 6, The process involves inserting one of the divided shaft portions into the curled lower end portion of the shutter slat so as to receive the upper end portion of the shutter slat, thereby sandwiching the lower end portion between the divided shaft portions. A method for crimping the end of a slat, comprising the steps of: driving the electric screwdriver body while the divided shaft portion is engaged with the lower end to be engaged, and rotating the slat crimping jig in the same direction as the curl direction of the lower end to be engaged.

11. Using the electric screwdriver according to claim 7, which references any one of claims 3 to 6, The process involves inserting one of the divided shaft portions into the curled lower end portion of the shutter slat so as to receive the upper end portion of the shutter slat, thereby sandwiching the lower end portion between the divided shaft portions. A method for releasing the crimping of a slat end, comprising the steps of: driving the electric screwdriver body while the divided shaft portion is engaged with the engaged lower end, and rotating the slat crimping jig in the direction opposite to the curl direction of the engaged lower end.

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