Slogging wrench, jig, and tool set

Abstract

To provide a slogging wrench which enables a worker to work safely without getting fingers caught between the slogging wrench and another component, such as a bolt, and can stabilize behavior of the slogging wrench.SOLUTION: A slogging wrench 1a includes: a head 10 which is fitted in a rotated element, such as a bolt 9, and may be rotatable with the rotated element; an arm part 20 which is fixed to the head 10 and receives an impact in a rotation direction R of the head 10; a knob part 30 which is axisymmetric with respect to a rotation center C of the head 10; and a connection part 40 which connects and fixes the head 10 with the knob part 30 to make the knob part 30 rotatable with the head 10.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a striking wrench for rotating a rotated element such as a bolt or nut, a jig used with the striking wrench, and a tool set having the striking wrench and the jig. [Background technology]

[0002] Striking wrenches are known that allow the arm to be struck with a hammer to rotate rotating elements such as bolts and nuts with a large torque. To prevent the striking wrench from falling, it is recommended to thread a rope through a hole formed in the arm of the striking wrench and strike the arm while pulling the rope in the direction of rotation of the striking wrench. However, if the rope alone is insufficient to prevent the striking wrench from falling, such as when the inclination of the bolt installation surface is 90 degrees or more, it is possible to strike the arm while holding the striking wrench with one hand.

[0003] 1 to 4 show how a conventional impact wrench 1 is used. In this example, the outer periphery of the inspection hatch cover 8 of a large tank is tightly fastened with a large number of bolts 9. The installation surface of the bolts 9 is at approximately 90 degrees to the horizontal. As shown in FIG. 1, when attempting to loosen one bolt 9, first the head 10 of the impact wrench 1 is fitted onto the bolt 9. Next, as shown in FIG. 2, the arm 20 of the impact wrench 1 is struck with a hammer 7. At this time, it is sufficient to hold the impact wrench 1 with approximately the flat of one's hand to prevent it from falling.

[0004] However, as shown in Figure 3, as the bolt 9 rotates counterclockwise along with the strike wrench 1 and loosens, the friction between the bolt 9 and the lid 8 drops sharply. This can cause the strike wrench 1 to rotate significantly with a single strike, making the behavior of the strike wrench 1 unstable, and the worker may reflexively bend his fingers to grip the strike wrench 1. Even if a rope is tied to the strike wrench 1, the rotation of the strike wrench 1 can loosen the rope, making the behavior of the strike wrench 1 unstable, so the worker may bend his fingers to grip the strike wrench 1. Furthermore, as the worker repeats the same operation on many bolts 9, his hands become fatigued, and he may unconsciously bend his fingers to grip the strike wrench 1 to compensate for the decrease in the strength of the flat hand.

[0005] As shown in Figure 4, the hand holding the strike wrench 1 rotates together with the strike wrench 1. If there is another bolt 9 or other structure or protrusion in the immediate vicinity of the bolt 9 to be worked on, there is a risk of the fingers being pinched as the strike wrench 1 rotates. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-120097 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-194506 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-108488 [Patent Document 4] Japanese Patent Application Laid-Open No. 2014-108489 [Patent Document 5] Japanese Utility Model Application Publication No. 59-132772 Summary of the Invention [Problem to be solved by the invention]

[0007] Patent Documents 1 to 4 describe jigs that can be attached to a bolt shank to prevent an impact wrench from falling. However, while the jigs described in Patent Documents 1 to 4 can be attached to a bolt shank when fitting the impact wrench into a nut, they cannot be attached when fitting the impact wrench into a bolt head because there is no bolt shank.

[0008] Patent Document 5 describes a method in which a handle body is rotatably attached to the socket body of a socket wrench, and loose bolts can be turned efficiently by lightly pressing the handle body and rotating the circular handle by inertia. However, the handle body is supported by the socket body only by a single central axis, and cannot withstand the impact of an impact, so the technology described in Patent Document 5 cannot be applied to an impact wrench.

[0009] One aspect of the present invention provides an impact wrench that allows safe operation without pinching fingers between the impact wrench and other bolts, a jig to be used with the impact wrench, and a tool set that includes the impact wrench and the jig. [Means for solving the problem]

[0010] An impact wrench according to one aspect of the present invention comprises: a head portion fitted to the rotated element and rotatable together with the rotated element; an arm portion fixed to the head and receiving a blow in the rotation direction of the head; A knob portion that is axially symmetrical with respect to the rotation center of the head portion; a connecting portion that connects and fixes the head portion and the knob portion to allow the knob portion to rotate together with the head portion; Equipped with.

[0011] A jig according to one aspect of the present invention comprises: A jig used with a striking wrench including a head portion that is fitted to a rotated element and can rotate together with the rotated element, and an arm portion that is fixed to the head portion and receives a strike in the rotation direction of the head portion, a connecting portion that is fitted to the head portion; a knob portion fixed to the connecting portion, the knob portion being axially symmetrical about the rotation center of the head portion and rotatable together with the head portion when the connecting portion is fitted to the head portion; Equipped with.

[0012] A tool set according to one aspect of the present invention comprises: A striking wrench including a head portion that is fitted to a rotated element and can rotate together with the rotated element, and an arm portion that is fixed to the head portion and receives a strike in the rotation direction of the head portion; a jig including a connecting portion that is fitted to the head portion, and a knob portion that is fixed to the connecting portion and that is axially symmetrical about the rotation center of the head portion and rotatable together with the head portion when the connecting portion is fitted to the head portion; Equipped with. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 shows a conventional impact wrench 1 fitted onto a bolt 9. [Figure 2] FIG. 2 shows a state in which a conventional impact wrench 1 is struck while being held down with an open hand. [Figure 3] FIG. 3 shows a state in which a worker tries to grip the conventional impact wrench 1 by bending his fingers while working with the wrench. [Figure 4] FIG. 4 shows a state in which a hand gripping a conventional striking wrench 1 rotates together with the striking wrench 1. [Figure 5] FIG. 5 is a plan view of the impact wrench 1a according to the first embodiment. [Figure 6] FIG. 6 is an elevational view of the impact wrench 1a according to the first embodiment. [Figure 7] FIG. 7 is a bottom view of the impact wrench 1a according to the first embodiment. [Figure 8] FIG. 8 shows a state in which the impact wrench 1a according to the first embodiment is fitted onto a bolt 9. [Figure 9] FIG. 9 shows how the impact wrench 1a according to the first embodiment is struck while the knob portion 30 is held. [Figure 10]FIG. 10 is a plan view of the impact wrench 1 and the jig 3 according to the second embodiment. [Figure 11] FIG. 11 is an elevational view of the impact wrench 1 and the jig 3 according to the second embodiment. [Figure 12] FIG. 12 is a bottom view of the impact wrench 1 and the jig 3 according to the second embodiment. [Figure 13] FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail. Note that the embodiments described below do not unduly limit the content of the present invention described in the claims. Furthermore, not all of the configurations described in the embodiments are necessarily essential as the solution of the present invention. Furthermore, the same components will be given the same reference numerals and descriptions thereof will be omitted.

[0015] <1. First embodiment> Figures 5 to 7 show the configuration of an impact wrench 1a according to the first embodiment. Each of Figures 5 to 7 shows an X-axis, a Y-axis, and a Z-axis that are perpendicular to one another. Figure 6 is an elevation view, Figure 5 is a plan view, and Figure 7 is a bottom view. The impact wrench 1a comprises a head 10, an arm 20, a knob 30, and a connecting portion 40. The impact wrench 1a corresponds to the impact wrench of the present invention.

[0016] <1-1.Head 10> Head 10 is the part that is fitted onto bolt 9, which is an example of a rotated element. An impact wrench with an annular head 10 is called an impact open-end wrench. If bolt 9 has a regular hexagonal bolt head, head 10 may have an inner surface 11 that is a combination of two regular hexagons. When torque is applied to arm 20 with head 10 fitted onto bolt 9, head 10 rotates together with bolt 9. The center of rotation C of head 10 coincides with the center of rotation of bolt 9. The direction of rotation of head 10 is designated as R.

[0017] <1-2. Arm 20> The arm 20 is a rod-shaped portion fixed to the head 10. The arm 20 is made sturdy, with a larger dimension in the direction perpendicular to both the center of rotation C and the longitudinal direction of the arm 20 (Y direction) than in the direction parallel to the center of rotation C, so that it can withstand impacts in the rotation direction R of the head 10. The arm 20 may be bent at two bend lines 21 to prevent the installation surface of the bolt 9, for example, the surface of the lid 8 shown in FIG. 1, from being struck by the hammer 7. Alternatively, the bend line 21 may be at only one location.

[0018] <1-3. Knob 30> The knob 30 is a disk-shaped portion that is arranged symmetrically about the center of rotation C of the head 10.

[0019] <1-4. Connection part 40> The connecting part 40 is a generally hollow truncated cone-shaped part located between the head part 10 and the knob part 30. The connecting part 40 connects and fixes the head part 10 and the knob part 30, thereby allowing the knob part 30 to rotate together with the head part 10. The central axis of the truncated cone coincides with the center of rotation C of the head part 10. The larger diameter end of the connecting part 40 is connected to the head part 10, and the smaller diameter end of the connecting part 40 is connected to the knob part 30.

[0020] The end of the connecting part 40 on the large diameter side is fixed to the head 10 at a plurality of positions outside the rotated element when viewed from the rotation center C of the head 10. The connecting part 40 also includes a plurality of openings 42 so that the rotated element can be seen from a viewpoint outside the plurality of positions at which the connecting part 40 is fixed to the head 10. The openings 42 are provided on the large diameter side of the connecting part 40.

[0021] The small diameter end of connecting portion 40 has a smaller diameter than knob portion 30. There is no opening 42 near the small diameter end of connecting portion 40, and it is desirable that the small diameter side of connecting portion 40, like knob portion 30, is axially symmetrical with respect to the center of rotation C of head 10.

[0022] The rotated element is not limited to bolt 9. A nut (not shown) may also be rotated as the rotated element. Because connection part 40 is hollow as described above, if the bolt shaft that passes through the nut is long enough to be accommodated inside the hollow interior of connection part 40, the bolt shaft does not get in the way when head part 10 is fitted into the nut, and the nut can be rotated.

[0023] <1-5. Usage> 8 and 9 show how to use the impact wrench 1a according to the first embodiment. As shown in Fig. 8, when the impact wrench 1a is fitted onto a bolt 9, the bolt 9 can be seen from the outside through the opening 42.

[0024] As shown in Figure 9, an operator grasps knob 30 of impact wrench 1a and strikes arm 20 with hammer 7. Because knob 30 is axially symmetrical with respect to center of rotation C of head 10, even if knob 30 rotates together with head 10, knob 30 can be slid relative to the hand so that the hand grasping knob 30 does not rotate together with knob 30.

[0025] <1-6.Effects> (1) According to the first embodiment, the impact wrench 1a has: a head 10 fitted to a rotated element such as a bolt 9 and rotatable together with the rotated element; an arm portion 20 fixed to the head portion 10 and receiving a blow in the rotation direction R of the head portion 10; A knob portion 30 that is axially symmetrical with respect to the rotation center C of the head portion 10; a connecting portion 40 that connects and fixes the head portion 10 and the knob portion 30, thereby allowing the knob portion 30 to rotate together with the head portion 10; Equipped with.

[0026] According to this, by providing the knob 30 that is axially symmetrical with respect to the center of rotation C of the head 10 and the connection part 40 that connects and fixes the head 10 and the knob 30, allowing the knob 30 to rotate together with the head 10, the knob 30 can be slid relative to the hand holding the knob 30, even if the knob 30 rotates together with the head 10. This allows for safe work without pinching fingers between the impact wrench 1a and other bolts 9, etc. Furthermore, because the knob 30 rotates together with the head 10, gripping the knob 30 allows the knob 30 to slide as needed to suppress the rotation of the head 10, stabilizing the behavior of the impact wrench 1a.

[0027] (2) According to the first embodiment, The connecting portion 40 is fixed to the head 10 at a plurality of positions outside the rotated element as viewed from the rotation center C of the head 10, and includes an opening 42 that allows the rotated element to be viewed from a viewpoint outside the plurality of positions as viewed from the rotation center C of the head 10.

[0028] This allows the worker, when performing work using the impact wrench 1a, to confirm that the impact wrench 1a is fitted onto a rotated element such as a bolt 9 before striking with the hammer 7.

[0029] 2. Second embodiment 10 to 13 show the configuration of an impact wrench 1 and a jig 3 according to the second embodiment. Each of FIGS. 10 to 13 shows an X-axis, a Y-axis, and a Z-axis that are perpendicular to each other. With FIG. 11 being an elevation view, FIG. 10 is a plan view, and FIG. 12 is a bottom view. FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 11.

[0030] The impact wrench 1 may be a conventional impact wrench and includes a head 10 and an arm 20. The jig 3 includes a knob 30 and a connecting portion 40b. The head 10, arm 20, and knob 30 are the same as those in the first embodiment, but the second embodiment differs from the first embodiment in that the connecting portion 40b is not fixed to the head 10. The jig 3 corresponds to the jig in this invention, and the combination of the impact wrench 1 and jig 3 corresponds to the tool set in this invention.

[0031] <2-1. Connection part 40b> The connecting portion 40b is fitted onto the outside of the head 10, thereby positioning the knob 30 axially symmetrically with respect to the center of rotation C of the head 10 so that the knob 30 can rotate together with the head 10.

[0032] The large-diameter end of the connecting portion 40b is fitted into the head portion 10 by contacting the head portion 10 at a plurality of positions outside the rotated element when viewed from the rotation center C of the head portion 10. The connecting portion 40b also includes a plurality of openings 42b so that the rotated element can be seen from a viewpoint outside the plurality of positions where the connecting portion 40b contacts the head portion 10.

[0033] The small diameter end of connecting portion 40b has a smaller diameter than knob portion 30. There is no opening 42b near the small diameter end of connecting portion 40b, and it is desirable that the small diameter side of connecting portion 40b, like knob portion 30, be axially symmetrical with respect to the center of rotation C of head 10.

[0034] The connecting portion 40b includes a notch 44. The notch 44 receives the end of the arm 20 that is fixed to the head 10, thereby allowing the knob 30 to rotate together with the head 10.

[0035] <2-2.Effects> (3) According to the second embodiment, the jig 3 is A jig (3) used with an impact wrench (1) includes a head (10) that is fitted onto a rotated element such as a bolt (9) and can rotate together with the rotated element, and an arm (20) that is fixed to the head (10) and receives an impact in the rotation direction R of the head (10), a connecting portion 40b that is fitted to the head portion 10; a knob portion 30 that is fixed to the connecting portion 40b and that is axially symmetrical with respect to a rotation center C of the head portion 10 and can rotate together with the head portion 10 when the connecting portion 40b is fitted to the head portion 10; Equipped with.

[0036] According to the second embodiment, the tool set includes the striking wrench 1 and the jig 3.

[0037] According to this, by providing the connecting portion 40b that fits onto the head 10 and the knob 30 that is fixed to the connecting portion 40b and that is axially symmetrical about the center of rotation C of the head 10 and rotatable together with the head 10 when the connecting portion 40b is fitted onto the head 10, the knob 30 can be slid relative to the hand holding the knob 30 even when the knob 30 rotates together with the head 10. This allows for safe work without pinching fingers between the impact wrench 1a and other bolts 9, etc. Furthermore, because the knob 30 rotates together with the head 10, gripping the knob 30 allows the knob 30 to slide as needed to suppress the rotation of the head 10, stabilizing the behavior of the impact wrench 1.

[0038] (4) According to the second embodiment, The connecting portion 40b is configured to contact the head 10 at a plurality of positions outside the rotated element as viewed from the rotation center C of the head 10 and be fitted to the head 10, and includes an opening 42b that makes the rotated element visible from a viewpoint outside the above-mentioned plurality of positions as viewed from the rotation center C of the head 10.

[0039] This allows the worker, when performing work using the impact wrench 1, to confirm that the impact wrench 1 is fitted onto a rotated element such as a bolt 9 before striking with the hammer 7.

[0040] (5) According to the second embodiment, The connecting portion 40b has a notch 44 that receives the end of the arm portion 20 that is fixed to the head portion 10, thereby allowing the knob portion 30 to rotate together with the head portion 10.

[0041] This allows the connecting portion 40b to be fitted to the head 10 so that the knob 30 rotates together with the head 10, without requiring a complex structure for fixing the connecting portion 40b to the head 10. [Explanation of symbols]

[0042] 1, 1a...striking wrench, 3...jig, 7...hammer, 8...lid, 9...bolt, 10...head, 11...inner surface, 20...arm, 21...bending line, 30...grip, 40, 40b...connection, 42, 42b...opening, 44...notch, C...center of rotation, R...direction of rotation

Claims

1. a head portion fitted to the rotated element and rotatable together with the rotated element; an arm portion fixed to the head and receiving a blow in the rotation direction of the head; A knob portion that is axially symmetrical with respect to the rotation center of the head portion; a connecting portion that connects and fixes the head portion and the knob portion to allow the knob portion to rotate together with the head portion; A striking wrench with a

2. In claim 1, The connecting portion is fixed to the head at a plurality of positions outside the rotated element as viewed from the rotation center of the head, and includes an opening that makes the rotated element visible from a viewpoint outside the plurality of positions as viewed from the rotation center of the head. Impact wrench.

3. A jig used with a striking wrench including a head portion that is fitted to a rotated element and can rotate together with the rotated element, and an arm portion that is fixed to the head portion and receives a strike in the rotation direction of the head portion, a connecting portion that is fitted to the head portion; a knob portion fixed to the connecting portion, the knob portion being axially symmetrical about the rotation center of the head portion and rotatable together with the head portion when the connecting portion is fitted to the head portion; A jig having:

4. In claim 3, The connecting portion is configured to contact the head at a plurality of positions outside the rotated element as viewed from the rotation center of the head and be fitted to the head, and includes an opening that makes the rotated element visible from a viewpoint outside the plurality of positions as viewed from the rotation center of the head. jig.

5. In claim 3, The connecting portion has a notch that receives an end of the arm portion that is fixed to the head portion, thereby allowing the knob portion to rotate together with the head portion. jig.

6. A striking wrench including a head portion that is fitted to a rotated element and can rotate together with the rotated element, and an arm portion that is fixed to the head portion and receives a strike in the rotation direction of the head portion; a jig including a connecting portion that is fitted to the head portion, and a knob portion that is fixed to the connecting portion and that is axially symmetrical about the rotation center of the head portion and rotatable together with the head portion when the connecting portion is fitted to the head portion; A tool set having:

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