JP2009248199A - Torque tool and protective cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque tool enabling the user to visually confirm the light of a light source over a wide range for informing the user of the operating state of the torque tool by emitting light. <P>SOLUTION: The protective cover 8 with a light guide section 8a which is formed of a light transmitting elastic material is attached to a case 5 with a built-in circuit of a LED 6 which is attached to the outer surface of a torque wrench 1. The portion of the light guide section of the protective cover projects from the peripheral portion thereof. Since the light from the LED 6 is dispersed therearound at the light guide section 8a, the user can confirm the lighting of the LED 6 over a wide range. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a torque tool that informs an operator of information regarding an operation state by using a lamp display of a light source such as a light emitting diode, and more particularly to a structure of a torque tool that improves the visibility of lamp light from the light source to the operator. .

  Conventionally, in a torque tool such as a torque wrench, when a torque for tightening a fastening body such as a bolt or a nut (hereinafter referred to as a bolt) reaches a predetermined torque, for example, a toggle mechanism is activated to lightly impact an operator. Has been proposed so that it can be sensibly notified that the tightening torque has reached a predetermined torque value.

  Some of such torque tools include a switching device that detects the operation of the toggle mechanism and outputs a detection signal. According to the torque tool provided with such a switching device, it is possible to check whether the bolts are forgotten to be tightened by recording the output detection signals and comparing the number of detection signals with the number of bolts to be tightened. Is possible. Patent Document 1 describes a torque tool provided with such a switching device.

  FIG. 6 is a plan view (FIG. 6A) and a side view (FIG. 6B) of a torque wrench 101 provided with a conventional switching device.

  The torque wrench 101 is configured by attaching a head 102 to a lever 103 formed in a flat tube shape via a toggle mechanism (not shown) and fitting a socket 102a attached to the head 102 to a bolt. The grip 104 is rotated to tighten the bolt. When the tightening torque reaches a predetermined torque, a toggle mechanism (not shown) is operated, and the lever 103 rotates with a slight impact on the head 102.

  By the operation of the toggle mechanism, the switching device disposed in the case 105 attached to the outside of the lever 103 is turned on, and a detection signal indicating the operation state of the toggle mechanism is output from the switching device.

  When the operator recognizes the operation of the toggle mechanism, releases the tightening, and returns the toggle mechanism to the original state, the switching device is turned off. If a detection signal indicating the operating state of the toggle mechanism is transmitted to a receiver (not shown) via a wireless communication means such as an antenna disposed in the antenna case 107, the detection signal is received on the receiver side. Can be recorded as a single bolt tightening completion signal.

Then, when the switching device is turned on, the torque wrench 101 causes the LED 106, which is a light source installed in the case 105, to emit light, and the operator visually recognizes that the operation of the toggle mechanism is detected by the switching device. Can be confirmed by.
JP 2004-273127 A

  As described above, according to such a torque wrench 101, it is possible to visually confirm that the completion of tightening is detected by the switching device by the LED 106 emitting light.

  The switching device is disposed in the case 105 as described above. The case 105 is made of a metal having excellent durability in order to protect a circuit such as the switching device from an external impact.

  Similarly, the LED 106 that informs the operation of the switching device is disposed inside the case 105 in order to prevent damage, and the light of the LED 106 can be visually recognized through a confirmation hole 105 a formed in the case 105. ing. With such a structure, it is possible to prevent the LED 106 and the like from being damaged by the case 105 even when the case 105 is hit against something during the work or the torque wrench 101 falls to the ground.

  However, by arranging the LED 106 inside the case in this way, there is a problem that the range in which the light emission of the LED 106 can be visually recognized is very narrow.

  FIG. 7 shows a longitudinal sectional view of the case 105 portion attached to the conventional torque wrench 101. As shown in FIG. 7, the LED 106 disposed on the substrate 110 inside the case 105 is turned on when a detection signal is output from a switching device (not shown) by the operation of the toggle mechanism. Then, the light emitted from the LED 106 is emitted in the direction of the arrow L through the confirmation hole 105 a formed in front of the irradiation direction of the LED 106. Therefore, in order to confirm the lighting of the LED 106, the operator must visually recognize from the extension in the arrow L direction.

  However, since the direction of the torque wrench 101 changes depending on the position of the bolt to be tightened, the torque wrench 101 cannot always be used at a position where the lighting of the LED 106 can be confirmed. For example, when the tightening operation using the torque wrench 101 is performed in a state where the operator's line of sight is positioned on the side surface of the torque wrench 101, the torque wrench 101 is shown in FIG. You will see. If it does so, the confirmation hole 105a cannot be seen from the above-mentioned arrow L direction, and an operator cannot confirm lighting of LED106. In particular, when an LED is used as the light source, the light from the LED is highly linear, so it is difficult to check the lighting of the LED 106 when it is slightly out of the extended position.

  On the other hand, it is possible to expose a light source such as an LED to the outside of the case, but in this case, there is a high possibility that the light source will be damaged when it collides with another object or when the torque wrench 101 falls.

  It is also possible to arrange a plurality of light sources such as LEDs so that they can be viewed from a plurality of directions. However, a plurality of light sources are required or a plurality of LED confirmation holes are provided in the case 105. There must be. Even if a plurality of light sources are provided so that the lighting of the light sources can be confirmed from a plurality of directions, the visibility can be visually recognized only from the irradiation direction of the light sources.

  As described above, in the conventional torque wrench that notifies the worker by the light of the light source such as the LED, it is necessary to arrange the light source such as the LED in the case in order to protect the LED from the impact. By arranging the LEDs inside, there is a problem that the range in which the operator can confirm the lighting is limited.

  Therefore, the present invention has been made to solve the problem related to the visibility of the lamp display of the light source in such a torque tool such as a conventional torque wrench. An object of the present invention is to provide a torque tool capable of confirming a lamp from a wide range.

  The torque tool of the present invention is provided with a torque tool body and a light source that is attached to the torque tool body and displays the operation state of the torque tool body in a lamp, and emits lamp light from the light source outside the case. A torque tool having a confirmation hole for making a light guide member provided with a light guide part that diffuses the lamp light from the confirmation hole toward the periphery of the confirmation hole on the outside of the case Is provided outside the case.

  The protective cover of the present invention is attached to the torque tool main body and the torque tool main body, and houses a light source that displays the operation state of the torque tool main body in a lamp, and emits the lamp light from the light source to the outside of the case. A light guide unit that is attached to the outside of the case of the torque tool having a confirmation hole for diffusing the light from the confirmation hole toward the periphery of the confirmation hole on the outside of the case It is characterized by having.

  According to the torque tool of the present invention, the light of the light source emitted from the confirmation hole can be diffused around by the light guide portion. Thereby, the operator can confirm the lighting of the light source from a wide range through the light guide unit. Moreover, according to this invention, the visibility of lighting of a light source can be improved easily, without changing the structure of a torque tool, or increasing the number of light sources.

  In addition, if the light guide is formed on a protective cover made of an elastic material that transmits light, it is possible to improve the visibility of the light from the light source. An effect of preventing the object from being damaged can also be obtained.

  Hereinafter, a torque tool according to the present invention will be described based on an embodiment shown in the drawings.

Example 1
FIG. 1 is a plan view of a torque wrench 1 which is a torque tool of the present embodiment, and FIG. 2 is a side view of the torque wrench 1 of the present embodiment. FIG. 3 is a cross-sectional view of the case 5 when the protective cover 8 serving as a light guide member including the light guide portion 8a is attached to the case 5 of the torque wrench 1. From FIG. (C) is a plan view and a side view of the protective cover 8.

  In the torque wrench 1 of this embodiment, when a fastening body such as a bolt or a nut (hereinafter referred to as a bolt) is tightened, a predetermined impact is applied by giving a light impact to an operator by operating a toggle mechanism (not shown). It is possible to inform that it has reached. Furthermore, the torque wrench 1 of the present embodiment can detect the operation of the toggle mechanism by the switching device and transmit the detection signal to the receiver via the wireless communication means. Therefore, by recording the detection signal on the receiver side, the number of bolts tightened using the torque wrench 1 can be confirmed from the recorded detection signal.

  A specific configuration of the torque wrench 1 will be described. The basic structure of the torque wrench 1 of this embodiment is the same as that of a torque wrench having a conventional toggle mechanism, and the head 2 is connected to the lever 3 formed in a flat tube shape via a toggle mechanism (not shown). It is attached. A grip 4 is provided on the rear end side of the lever 3. Inside the lever 3 covered with the grip 4, there is provided an adjustment knob portion for making it possible to change the set torque value for operating the toggle mechanism. The above is the configuration of the torque wrench body.

  On the outer surface of the lever 3 of the torque wrench 1, a case 5 in which an electronic circuit such as a switching device (not shown) for detecting the operation of the toggle mechanism and an LED 6 described later is housed is fixed.

  In this embodiment, the case 5 is constituted by a case body 51 formed in a rectangular parallelepiped shape, for example, opened upward, and a flat lid body 52 that detachably closes the opening of the case body 51. Further, an antenna case 7 having an antenna disposed therein is provided behind the case body 51.

  A circuit board 10 is attached in the case main body 51, and an LED 6 is mounted on the upper surface of the circuit board 10 with the irradiation direction facing upward. And the confirmation hole 52a which penetrates the cover body 52 is formed in the cover body 52 in the position just above LED6 in the state which attached the cover body 52 to the case main body 51. As shown in FIG. The lid 52 is provided with a battery lid 53 so as to be removable.

  The opening diameter of the confirmation hole 52a is formed to be the same or slightly larger than the outer diameter of the LED 6, so that the emitted light from the LED 6 can be emitted from the confirmation hole 52a as much as possible outside the case.

  The case main body 51 and the lid body 52 constituting the case 5 are made of a metal having excellent strength and durability in order to protect the switching device, the LED 6 and the like disposed inside the case 5 from an external impact. Forming. However, the case main body 51 and the lid body 52 may be formed of other materials excellent in strength and durability.

  The switching device is turned on when the above-described toggle mechanism is operated, and outputs a detection signal indicating the operating state of the toggle mechanism. As this switching device, for example, a reed switch, a limit switch, a switch using a Hall element and a magnet, a strain gauge, or the like can be used, and a switch or sensor that can detect the operating state and the return state of the toggle mechanism. Anything can be used.

  As described above, an LED (light emitting diode) 6 as a light source for performing lamp display is disposed in the case 5. The LED 6 is turned on when the detection signal is output from the switching device. By turning on the LED 6 in this manner, it is possible to notify the operator that the switching device has detected the operating state of the toggle mechanism. Moreover, the lamp light emitted from the LED 6 is emitted toward the outside of the case 5 through a confirmation hole 52a formed in accordance with a position where the LED 6 of the case 5 is disposed.

  In the case 5, an electronic circuit (not shown) for controlling the switching device and controlling wireless communication processing using the antenna in the antenna case 7 disposed outside the case 5 is disposed.

  A protective cover 8 that covers the entire case 5 and the antenna case 7 is attached to the case 5 of the torque wrench 1 of the present embodiment. The protective cover 8 is formed in a bag shape so as to cover the case 5 and the antenna case 7 integrally from above. The protective cover 8 is a cover for preventing damage to the bumped object even when the metal case 5 is hit against the periphery during the tightening operation. Therefore, it is preferable to use a soft elastic material such as silicon rubber as the material. Further, as described later, in order to be able to confirm the light of the LED 6 even when the protective cover 8 is attached to the case 5, it is necessary to be a transparent or translucent elastic material that transmits light. In this embodiment, the protective cover 8 is made of silicon rubber that transmits light.

  Further, as shown in FIGS. 2 and 3, the protective cover 8 protrudes in a hemispherical shape in front of the light emission direction of the LED 6 emitted through the confirmation hole 52a at a position corresponding to the confirmation hole 52a. It has a light guide 8a. The lamp light from the LED 6 is diffused and scattered around the light guide portion 8a by being transmitted through the protective cover 8 and reflected on the hemispherical surface of the light guide portion 8a. Thus, when the LED 6 is lit, the entire light guide 8a appears to emit light. Therefore, even if the operator does not operate the torque wrench 1 at a position where the light of the LED 6 can be directly seen from the confirmation hole 52a, the LED 6 can be turned on if the projected light guide 8a is visible. It can be confirmed by the light emitted from.

  Thereby, in the case of the conventional torque wrench 1 as shown in FIG. 6, FIG. 7, the problem that light cannot be confirmed unless it is from the irradiation direction (arrow L) front of LED106 can be eliminated.

  Therefore, according to the torque wrench 1 of the first embodiment, if the position of the operator's viewpoint is a position from the position in front of the irradiation direction facing the LED 6 to a height at least where the side surface of the torque wrench 1 can be seen, It is possible to confirm the light from the light part 8a. And if it is in the range of the height of such a viewpoint, lighting of the light source can be confirmed from any direction around the light guide portion 8a.

  In addition, you may form inside the protective cover 8 and the light guide part 8a in a concave shape in the position corresponding to the confirmation hole 52a. Also in that case, the light passing through the confirmation hole 52a travels through the protective cover 8 and the hollow portion of the light guide 8a, and is reflected by the inner surface of the light guide 8a and scattered around. Therefore, it is possible to improve the visibility as in the case of not being hollow.

  Next, operation | movement of the torque wrench 1 of a present Example is demonstrated.

  First, the socket 2a attached to the head 2 of the torque wrench 1 is fitted to the bolt, and the lever 3 and the head 2 are rotated together by grasping the grip 4 of the lever 3 and pulling the lever 3. Tighten the bolts. When the tightening torque reaches a predetermined torque, a toggle mechanism (not shown) is activated, and the lever 3 rotates with a light impact on the head 2. If it does so, the switching device in case 5 will detect the operation state of a toggle mechanism, will be in an ON state, and will output the detection signal which shows the operation | movement of a toggle mechanism.

  Then, the LED 6 is turned on by a detection signal from the switching device. The lamp emitted by the lighting of the LED 6 passes through the protective hole 8 through the confirmation hole 52 a of the case 5. The light that has passed through the protective cover 8 and reached the light guide portion 8a is scattered around the light guide portion 8a, and the entire projected light guide portion 8a appears to emit light. Therefore, if the operator uses the torque wrench 1 at a position where the light guide portion 8a can be seen, the light emission of the LED 6 can be confirmed through the light guide portion 8a when the toggle mechanism is operated. Therefore, it is possible to confirm the lighting of the LED 6 from a very wide range as compared with the conventional torque wrench.

  A detection signal from the switching device is transmitted to a receiver (not shown) via an antenna in an antenna case 7 disposed outside the case 5 and recorded in a receiver or a computer connected to the receiver. By comparing the number of recorded detection signals with the number of bolts to be tightened, it is possible to confirm whether or not the bolts are forgotten to be tightened.

  When the toggle mechanism is activated and a detection signal is output from the switching device, when the operator releases the tightening, the toggle mechanism returns to the original state, and the switching device is turned off.

  When the operator tightens the bolt and the LED 6 is lit by the operation flow as described above, the switching device detects the operation of the toggle mechanism and receives a detection signal indicating the completion of one-time bolt tightening. It can be confirmed visually that it has been sent to the machine. And according to the torque wrench of a present Example, since the whole light guide part 8a which protruded with the light from LED6 shines, the operator can confirm lighting of LED6 from the wide range compared with the past.

  Since the torque wrench 1 of the present embodiment as described above has a configuration in which the protective cover 8 provided with the light guide portion 8a is mounted on the case 5, the conventional torque wrench is used as it is, and the light of the LED It is possible to widen the irradiation range. That is, it is possible to widen the range in which the light of the light source for performing lamp display can be easily confirmed without changing the structure of the torque wrench 1 or the case 5 or increasing the number of LEDs 6. In particular, when an LED with high linearity of irradiation light is used as the light source, it is effective for improving the lighting visibility.

  In addition, although the light guide part 8a of the first embodiment is formed so as to protrude in the light emission direction from the LED 6, that is, toward the outside of the case 5 (cover 8), the case 5 (cover 8) is further formed. You may form the projection part which protrudes with respect to the inside.

  Thus, if a projection part is formed also inside, the light guide part 8a can be reliably positioned at the position of the confirmation hole 52a by inserting the projection part into the confirmation hole 52a. Moreover, since the distance between the LED 6 and the light guide portion 8a is reduced due to the presence of the protruding portion, the light guide efficiency can be improved. However, when the confirmation hole 52a is blocked with a transparent acrylic resin or the like for the purpose of preventing dust from entering, the protrusion cannot be provided on the inner side.

  In the torque wrench 1 of the first embodiment described above, silicon rubber is used as the material of the protective cover 8, but is not limited thereto, and other elastic materials that transmit light can be used. . A resin that transmits light may be used.

  Moreover, although the protective cover 8 of the present embodiment has been described on the assumption that the light guide portion 8a and other portions are integrally formed, the portion of the light guide portion 8a through which the light of the LED 6 transmits is made of a material having high light transmittance. The other portions may be formed of a non-permeable material.

  Moreover, although the light guide part 8a of a present Example demonstrated as what was formed in hemispherical shape, it is not restricted to this, The light guide part has protruded with respect to the surrounding protective cover part. Any shape may be used as long as the light from the light source diffuses or scatters around. For example, a cylindrical shape or a polygonal column shape may be used. Alternatively, only the light guide 8 a may be formed separately and combined with the protective cover 8.

  In the present embodiment, the LED is used as the light source for performing the lamp display. However, the present invention is not limited to this, and any light source having a size that can be stored in the case 5 can be used. But you can.

  In addition, the shape of the protective cover 8 described in the first embodiment can be appropriately changed according to the shape of the torque wrench 1 and the case 5 thereof.

  Further, the positions and the number of the LEDs 6 and the confirmation holes 52a are not limited to those shown in FIG. 1 and the like, and may be arranged in any manner. And the light guide part 8a can be formed according to the position of LED6 and its confirmation hole 52a.

  In the first embodiment, the LED 6 serving as the light source is described as being turned on in response to the detection signal of the switching device. However, the present invention is similarly applied to light sources used for other purposes. Can do.

  Other uses of the LED (light source) to which the present invention can be applied include, for example, a torque wrench capable of performing wireless communication in the same manner as the torque wrench 1 of this embodiment. It may be used as a light source for displaying that the wireless communication is established. Specifically, the bolt is tightened with a torque wrench, and when the completion of tightening is detected by the switching device, the detection signal is transmitted to the receiver by wireless communication. When the receiver receives the detection signal, it transmits a communication establishment signal indicating that the detection signal has been received to the torque wrench. When the torque wrench receives this communication establishment signal, a light source such as an LED is used to display that the wireless communication has been established between the torque wrench and the receiver.

  As another application, in a torque wrench capable of calculating a tightening torque with a digital value, an LED is used as a light source for determining whether the measured torque value is within an allowable range and notifying the determination result. It may be a thing. That is, whether a tightened torque value is within a predetermined torque value range by using a digital torque wrench that is equipped with a sensor capable of measuring torque, such as a strain gauge, and that can be tightened with a digital value. The pass / fail judgment is performed. A light source such as an LED is used to display the pass / fail judgment result to the operator. Further, two LEDs of different colors may be arranged in order to display each of the pass / fail indications, and one of them may be lit according to the pass / fail.

  Even in the case where LEDs are used for the above-mentioned applications, the visibility of each LED can be obtained by attaching a cover in which the light guide portion 8a is formed at a position corresponding to the LEDs in the same manner as in the present embodiment. Can be improved. Even when there are a plurality of LEDs as described above, the visibility of each LED can be improved by forming the light guide portion 8a at a position corresponding to each LED and the confirmation hole.

  That is, in the torque wrench 1, when a light source is used to notify an operator of any kind, the protective cover 8 having the light guide portion 8a described above is attached to a position corresponding to the light source to thereby remove the light from the light source. The visibility of the lamp can be improved.

(Example 2)
A torque wrench 1 of Example 2 is shown in FIG.

  In the torque wrench 1 of the second embodiment, the light guide portion is not a protective cover that covers the entire case 5, but a ring-shaped and wide band. Since the configuration of the other torque wrench 1 is the same as that of the first embodiment, the description of the overlapping parts is omitted.

  As shown in FIG. 5, the torque wrench 1 and its case 5 of this embodiment are equipped with a ring-shaped light guide band 18 having a light guide portion 18a. The light guide band 18 is formed wide enough to form the light guide portion 18a, and is elastically tightened and attached to the outer periphery of the lever 3 of the torque wrench 1 and the case 5 installed on the outer surface thereof.

  The light guide band 18 is formed with a light guide portion 18a. The shape and function of the light guide 18a are the same as those of the light guide 8a of the first embodiment. Therefore, in the case of the first embodiment, the light guide band 18 is attached so that the position of the light guide portion 18a is located at a position corresponding to the LED 6 and the confirmation hole 52a from which the light from the LED 6 is emitted to the outside. Similarly, the light from the LED 6 is scattered around the light guide 18a. As a result, when the LED 6 is turned on, the entire light guide 18a appears to emit light to the operator, and the visibility of the light from the light source is improved.

  The light guide band 18 is formed of silicon rubber that transmits light in the same manner as the protective cover 8 of the first embodiment. Further, in order to prevent the light guide band 18 from being rotated or displaced in the axial direction of the torque wrench 1 and the light guide portion 18a from being displaced from the position of the confirmation hole 52a, the light guide band 18 is in a case in the mounted state. 5 and the torque wrench 1 are mounted so as to be elastically tightened. Accordingly, it is possible to prevent the light guide portion 18a from being displaced due to the frictional force between the light guide band 18 formed of an elastic material and the torque wrench 1.

  If the light guide portion 18a is formed in a band shape in this way, the light guide portion 18a can be moved freely. For example, even if the torque wrench where the LED 6 of the light source is arranged is different, the light guide band 18 can be shared. In the case of the protective case 8 of the first embodiment, it is necessary to form the protective cover 8 and the light guide portion 8a according to each torque wrench, and the torque wrench having different positions of the LED 6 can share the protective cover. However, the light guide band 18 according to the second embodiment can be shared by moving the position of the light guide portion 18a as described above.

  Moreover, you may comprise so that the inner periphery of this light guide band 18 can be adjusted. If the inner circumference can be adjusted, it can be used for torque wrenches of various sizes.

  Further, similarly to the case of the first embodiment, the light guide portion 18a may be formed with a protruding portion that protrudes toward the inside of the case. This facilitates the positioning of the light guide portion 18a with respect to the confirmation hole 52a and improves the light guide efficiency of the lamp light of the LED 6. In particular, in the case of the light guide band 18 as in the second embodiment, the light guide band 18 is likely to rotate around the axis of the torque wrench 1 or shift in the axial direction. Therefore, by forming a protrusion on the inner side of the light guide 18a and inserting the protrusion into the confirmation hole 52a, the above-described shift can be prevented.

  In the above-described embodiments, the light guide member forming the light guide portion has been described as a protective cover that covers the case or as a light guide band that is elastically tightened and attached, but is not limited thereto. However, any light guide member may be used as long as the light guide portion is disposed at a position corresponding to the confirmation hole 52a. For example, the sheet on which the light guide portion is formed may be attached by being adhered so that the light guide portion is disposed at the position of the confirmation hole 52a.

1 is a plan view of a torque wrench 1 of Embodiment 1. FIG. The side view of the torque wrench 1 shown in FIG. Sectional drawing of the case 5 part of the torque wrench 1 shown in FIG. (A) The top view of the protective cover 8 of Example 1, (b), (c) Side view. The side view of the torque wrench 1 of Example 2. FIG. (A) The top view of the conventional torque wrench 101, and (b) Side view. Sectional drawing of the case part of the conventional torque wrench.

Explanation of symbols

1 Torque wrench 2 Head 3 Lever 4 Grip 5 Case 51 Case body 52 Lid 52a Confirmation hole 6 LED
7 Antenna Case 8 Protective Cover 8a Light Guide 18 Light Guide Band 18a Light Guide

Claims (7)

A torque tool main body and a light source that is attached to the torque tool main body and displays the operating state of the torque tool main body in a lamp are housed therein, and a confirmation hole is provided for emitting the lamp from the light source to the outside of the case A torque tool having a case,
A torque tool comprising: a light guide member provided with a light guide part for diffusing the light from the confirmation hole toward the periphery of the confirmation hole on the outside of the case.   The torque tool according to claim 1, wherein the light guide member also serves as a protective cover for the case.   The torque tool according to claim 1, wherein the light guide portion is formed at a position corresponding to the confirmation hole.   The torque tool according to claim 1, wherein the light guide member is a light guide band fastened and fixed to the case and the torque tool main body.   The torque tool according to claim 1, wherein the light guide portion protrudes in an emission direction of the lamp emitted from the confirmation hole.   The light guide part has a protrusion protruding inside the case, and the protrusion is inserted into the confirmation hole, thereby guiding light projected from the light source and the confirmation hole of the light guide part. The torque tool according to any one of claims 1 to 5, wherein positioning is performed. A torque tool main body and a light source that is attached to the torque tool main body and displays the operating state of the torque tool main body in a lamp are housed therein, and a confirmation hole is provided for emitting the lamp from the light source to the outside of the case Mounted on the outside of the case of the torque tool,
A protective cover, comprising: a light guide portion that diffuses the lamp light from the confirmation hole toward the periphery of the confirmation hole on the outside of the case.

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