JP2021178376A - Fastening tool - Google Patents

Abstract

To provide a fastening tool which prevents an operator from missing a change in a light emitting mode of a light emitting section during a fastening work.SOLUTION: In a fastening tool 100, a head 10 engaged with a fastening object is provided on a tip side, and a display D displaying a fastening torque value of the fastening object engaged with the head is installed in a hand side casing 40 which is provided on a hand side. The fastening tool includes: a light emitting section L in which a light emitting mode is changed according to a difference between the fastening torque value and the target value; and a head side casing 50 which is provided between the head and the hand side casing. The light emitting section is installed in the head side casing.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tightening tool.

As a tightening tool, Patent Document 1 describes a so-called digital torque wrench in which a display for displaying a tightening torque value to be tightened is installed in a casing provided on the hand side, and the casing is further tightened. A device in which an LED whose lighting interval changes according to the relationship between the attached torque value and the target value is disclosed. According to the torque wrench, the operator can intuitively perform the tightening work by confirming the change in the lighting interval of the LED.

However, in the torque wrench, since the LED is installed on the hand side, the LED and the tightening target are arranged apart from each other, and the operator is watching the tightening target during the tightening work. There is a problem that a change in the lighting interval of the LED is overlooked and a tightening error is made.

Japanese Patent Application Laid-Open No. 2001-2600044

Therefore, the main object of the present invention is to obtain a tightening tool that makes it difficult for an operator to overlook a change in the light emitting mode of the light emitting portion during the tightening work and can suppress a tightening error.

That is, the tightening tool according to the present invention is provided with a head engaged with the tightening target on the tip side, and the tightening target engaged with the head is tightened on the hand side casing provided on the hand side. A tightening tool provided with a display for displaying a torque value, the light emitting portion whose light emitting mode changes according to the difference between the tightening torque value and the target value, and the head and the hand-side casing. It is characterized in that it is provided with a head-side casing provided between them, and the light emitting portion is installed in the head-side casing.

In such a configuration, since the light emitting part is installed in the head side casing provided on the head side of the hand side casing, the light emitting part is arranged closer to the head than in the case where the light emitting part is installed in the hand side casing. Even if the operator is gazing at the tightening target engaged with the head during the tightening work, it becomes easier to catch the light emitted from the light emitting part and the light emitting part in the field of view, and the light emitting mode of the light emitting part changes. It becomes difficult to overlook, and tightening mistakes can be suppressed.

Further, as a specific embodiment of the present invention, the light emitting portion is arranged closer to the rotation axis of the tightening target than the display in a state where the tightening target is engaged with the head. Is.

Further, the light emitting portion may be installed at the tip end portion of the head side casing.

With such a configuration, the light emitting unit is arranged closer to the head, and it is difficult to overlook the change in the light emitting mode of the light emitting unit.

Further, the light emitting unit may be arranged at a position that can be visually recognized at the same time as the head.

With such a configuration, since the operator during the tightening work can visually recognize the light emitting portion at the same time as the head, it is difficult to overlook the change in the light emitting mode of the light emitting portion.

Further, the head-side casing may be tubular, and the light-emitting portion may be provided with a plurality of light-emitting surfaces facing different directions on the outer peripheral surface of the head-side casing.

According to such a configuration, when the worker during the tightening work looks at the outer peripheral surface of the casing on the head side, it is easy to catch one of the light emitting surfaces in the field of view, and it is difficult to overlook the change in the light emitting mode of the light emitting portion. Become.

Further, the head-side casing may have a cylindrical shape, and the light-emitting portion may have an annular light-emitting surface provided over the entire circumference of the outer peripheral surface of the head-side casing. ..

According to such a configuration, the light emitting surface can be seen in the field of view from any direction by the operator during the tightening work, and it is difficult to overlook the change in the light emitting mode of the light emitting portion. Become.

Further, the head-side casing may be thinner than the hand-side casing.

According to such a configuration, the head side casing is made thinner than the hand side casing, so that the head side of the tightening tool becomes thinner. Even if the head is inserted into the head, the gap formed around the head side becomes large, and it becomes easy to confirm the light emitting portion through the gap.

Further, the hand-side casing and the head-side casing may be installed so as to be separated from each other.

With such a configuration, the light emitting unit can be arranged closer to the head, and it is difficult to overlook the change in the light emitting mode of the light emitting unit.

Further, the head-side casing and the hand-side casing may be configured so that their outer peripheral surfaces are continuous with each other.

According to such a configuration, since the outer peripheral surfaces of the head-side casing and the hand-side casing are continuous with each other, a step facing the head side is not formed on the continuous outer peripheral surfaces. As a result, when the operator at the time of tightening work sees the light emitting portion from the hand side, the light emitting portion is not hidden behind the step, and it is difficult to overlook the change in the light emitting mode of the light emitting portion.

According to the tightening tool configured in this way, the light emitting portion is arranged closer to the head as compared with the case where the light emitting portion is installed in the casing on the hand side, so that the operator can change the light emitting mode of the light emitting portion during the tightening work. It is hard to overlook and tightening mistakes are suppressed.

It is a perspective view which shows typically the torque wrench which concerns on 1st Embodiment. It is a perspective view which shows typically the torque wrench which concerns on 1st Embodiment. It is a top view which shows typically the torque wrench which concerns on 1st Embodiment. It is sectional drawing which shows typically the torque wrench which concerns on 1st Embodiment. It is a block diagram which shows the function of the control part of the torque wrench which concerns on 1st Embodiment. It is a top view which shows typically the torque wrench which concerns on other embodiment.

Hereinafter, the tightening tool according to the present invention will be described with reference to the drawings.

The tightening tool according to the present invention is a so-called digital type equipped with a display for displaying a tightening torque value of a tightening target (for example, a screw, a bolt, a nut, etc.). Specifically, the tightening tool is a torque wrench, a torque driver, or the like. Hereinafter, a torque wrench will be described as an example.

<First Embodiment> As shown in FIGS. 1 to 4, the torque wrench 100 according to the present embodiment has a head 10 engaged with a tightening target, a handle portion 20 extending from the head 10, and a tightening portion 20. A torque sensor 30 that detects the tightening torque value to be attached, a hand-side casing 40 and a head-side casing 50 provided in the handle portion 20, a display D and an input portion I installed in the hand-side casing 40, and a head. A light emitting unit L provided on the side casing 50 and a control unit C for controlling the display D, the light emitting unit L, and the like are provided.

The head 10 is provided on the tip side. The head 10 is directly or indirectly engaged with the tightening target. The head 10 of the present embodiment is engaged with a tightening target via a socket (not shown). Specifically, as shown in FIG. 4, the head 10 accommodates a square drive 11 to which a socket is detachably attached, a ratchet mechanism 12 that limits the rotation direction of the square drive 11 in one direction, and a ratchet mechanism 12. The housing 13 is provided. The head 10 is not limited to such a configuration, and may be formed in a tip shape such as a spanner or a box wrench so that it can be directly engaged with the tightening target, for example.

The handle portion 20 has a long shape, and the head 10 is connected to the tip thereof. Specifically, the handle portion 20 has a grip portion 21 formed on the hand side and a shaft portion 22 interposed between the grip portion 21 and the head 10. The shaft portion 22 is provided with a connection mechanism 23 at the tip thereof, and the head 10 is detachably connected to the handle portion 20 via the connection mechanism 23.

The torque sensor 30 detects the tightening torque value of the tightening target T engaged with the head 10. The torque sensor 30 of this embodiment is a so-called strain gauge type. Specifically, the torque sensor 30 includes a strain gauge G attached to the shaft portion 22 of the handle portion 20, and detects a tightening torque value based on the strain amount of the strain gauge G generated during the tightening operation. Is.

The hand-side casing 40 and the head-side casing 50 are both cylindrical. Both the hand-side casing 40 and the head-side casing 50 have tapered outer peripheral surfaces 42 and 52 that taper from the hand side toward the head 10 side, and have a circular cross section. Further, the hand-side casing 40 and the head-side casing 50 have a pair of end faces 41, 51 facing each other at the base end on the hand side and the tip on the opposite side, and are formed on both end faces 41, 51. It is fixed to the shaft portion 22 passed through the through holes 41h and 51h. As a result, in the torque wrench 100, a first accommodation space S1 is formed between the inner peripheral surface of the hand-side casing 40 and the shaft portion 22, and between the inner peripheral surface of the head-side casing 50 and the shaft portion 22. The second casing space S2 is formed. The hand-side casing 40 and the head-side casing 50 are made of synthetic resin or the like.

Specifically, the hand side casing 40 is fixed to the hand side of the handle portion 20. More specifically, the hand-side casing 40 is fixed to the shaft portion 22 of the handle portion 20.

Specifically, the head-side casing 50 is fixed between the head 10 of the handle 20 and the hand-side casing 40. That is, the head-side casing 50 is fixed to the head 10 side (tip side) with respect to the hand-side casing 40 of the handle portion 20.

More specifically, the hand-side casing 40 is fixed to the shaft portion 22 of the handle portion 20 so as to be adjacent to the grip portion 21, and the head-side casing 50 is adjacent to the hand-side casing 40. It is fixed to the shaft portion 22 of the handle portion 20. Therefore, the hand-side casing 40 and the head-side casing 50 are arranged in series along the axial direction of the handle portion 20 from the grip portion 21 toward the head 10 side. The tip surface 41a of the hand-side casing 40 and the base end surface 51b of the head-side casing 50 are formed to have the same diameter. As a result, the outer peripheral surfaces 42 and 52 of the hand-side casing 40 and the head-side casing 50 are continuous with each other. That is, the hand-side casing 40 and the head-side casing 50 are configured so that the outer peripheral surfaces 42 and 52 of each other are continuous without a step.

Further, both the outer peripheral surface 42 of the hand-side casing 40 and the outer peripheral surface 52 of the head-side casing 50 are tapered from the hand side toward the head 10 side, and the inclination angle of the handle portion 20 with respect to the axial direction is increased. Are at the same angle. Therefore, the casing 40 on the hand side and the casing 50 on the head side have a truncated cone shape that narrows from the hand side toward the head 10 side as a whole.

The display D is installed along the outer peripheral surface 42 of the hand-side casing 40. Specifically, the display D is installed so as to face the direction opposite to the direction in which the tightening target travels when the tightening target is tightened with the torque wrench 100. In the present embodiment, the display D is installed so as to face the direction opposite to the stretching direction of the square drive 11. Electronic components such as a substrate and wiring connected to the display D are housed in the first storage space S1.

Specifically, the input unit I is a switch (button). The input unit I is installed along the outer peripheral surface 42 of the casing 40 on the hand side. The substrate connected to the input unit I is housed in the first storage space S1.

The light emitting portion L is installed in the head side casing 50. Specifically, it is installed at the tip portion 53 on the head 10 side of the head side casing 50. Then, as shown in FIG. 3, the light emitting portion L is arranged closer to the rotation axis R of the tightening target than the display D in the handle portion 20 in a state where the tightening target is engaged with the head 10. .. Therefore, as shown in FIG. 3, the light emitting unit L is arranged so that the distance d1 from the rotation axis R to be tightened is smaller than the distance d2 from the display D. Specifically, the light emitting unit L is tightened with respect to the distance d2 between one end of the display D on the head side (tip side) and the light emitting unit L (specifically, one end of the light emitting unit L on the head 10 side). The distance d1 between the rotation axis R to be attached and the light emitting portion L (specifically, one end of the light emitting portion L on the head 10 side) is arranged so as to be small. As a result, the light emitting unit L is arranged closer to the head 10 than the intermediate position between the rotation axis R to be tightened and the display D. The electronic components constituting the light emitting unit L are housed in the second storage space S2.

A specific configuration of the light emitting unit L will be described. The light emitting unit L includes a light emitting surface L1 provided on the outer peripheral surface 52 of the head side casing 50, and a light emitting body L2 that emits light to the outside of the head side casing 50 via the light emitting surface L1. ..

The light emitting surface L1 is an annular shape (ring shape) provided over the entire circumference of the outer peripheral surface 52 of the head-side casing 50. The light emitting surface L1 is provided so as to be flush with the outer peripheral surface 52 of the head-side casing 50.

The light emitting body L2 is, for example, an LED, and is installed in the second accommodation space S2 of the head-side casing 50 so as to face the light emitting surface L1 and is installed at a plurality of equal intervals along the light emitting surface L1. Further, the light emitting body L2 is not limited to one composed of a plurality of LEDs, and for example, a light guide body such as an optical fiber arranged along the light emitting surface L1 and an LED that emits light to the light guide body. It may be configured by.

The control unit C is composed of, for example, a dedicated or general-purpose computer having a CPU, an internal memory, an AD converter, an input / output inverter, and the like. Then, as shown in FIG. 5, the control unit C is configured to exert functions as a display control unit C1, a target-related value storage unit C2, a light emission control unit C3, and the like by a program stored in the internal memory. ing.

The display control unit C1 displays the tightening torque value detected by the torque sensor 30 on the display D. Specifically, the display control unit C1 updates, for example, the tightening torque value that changes during the tightening operation at any time, and displays the peak value on the display D. Therefore, the display D displays a numerical value based on the signal indicating the tightening torque value received from the display control unit C1.

The target-related value storage unit C2 stores the target value of the tightening torque value set for each tightening target and the allowable range of the tightening torque value. Here, the allowable range of the tightening torque value is a range including an allowable target value as the tightening torque value, and is a range having a lower limit value smaller than the target value and an upper limit value larger than the target value. .. The target value and the allowable range can be input from the input unit I.

The light emitting control unit C3 changes the light emitting mode of the light emitting unit L by comparing the tightening torque value detected by the torque sensor 30 with the target value stored in the target related value storage unit C2. Therefore, the light emitting unit L changes the light emitting mode based on the signal indicating the light emitting mode received from the light emitting control unit C3.

For example, the light emission control unit C3 gradually changes the light emission color of the light emitting body L2 as the tightening torque value approaches a target value or a target value range (a range acceptable as the tightening torque value to be tightened). It has become like. Specifically, the light emission control unit C3 has reached the notice range in which the tightening torque value is less than the lower limit value of the target value range and is equal to or more than the notice start value set to a value smaller than the lower limit value. The emission color of the light emitting body L2 is changed depending on the case and the case where the tightening torque value reaches the target value range. More specifically, the light emission control unit C3 causes the light emitting body L2 to emit light in yellow, which is the gaze color, when the tightening torque value falls within the notice range, and when the tightening torque value falls within the target value range, the light emitting body L2 Is emitted in green (blue), which is a safe color. The light emitting control unit C3 may cause the light emitting body L2 to emit light in red, which is a warning color, when the tightening torque value exceeds the target value range.

When using the torque wrench 100 of the present embodiment, the operator engages the head 10 with the tightening target, and then grips the head 10 while checking the emission color of the light emitting portion L arranged near the head 10. A force is applied to the portion 21, and when the emission color of the light emitting portion L changes to green, the force applied to the grip portion 21 is relaxed. After that, the operator confirms the numerical value displayed on the display D after the tightening operation, and determines whether or not the numerical value is within the target value range. If the numerical value displayed on the display D after the tightening work does not fall within the target value range, the operator determines that the tightening error has occurred and retightens the tightening.

According to such a configuration, since the light emitting portion is installed in the head side casing 50 provided on the head 10 side of the hand side casing 40, the light emitting portion L is arranged near the head 10 and during the tightening work. Even if the operator is gazing at the tightening target engaged with the head 10, it becomes easier to catch the light emitted from the light emitting unit L and the light emitting unit L in the field of view, and the change in the light emitting mode of the light emitting unit L is overlooked. It becomes difficult and tightening mistakes are suppressed. Further, since the head side casing 50 is made thinner than the hand side casing 40, the light emitting portion L can be easily seen even when the tightening target arranged in a narrow space is tightened. Further, since the hand-side casing 40 and the head-side casing 50 have continuous outer peripheral surfaces 42 and 52, a step facing the head 10 side is not formed on the outer peripheral surfaces 42 and 52, and the light emitting mode of the light emitting portion L is such that the step is not formed. It's hard to overlook changes. Further, when the hand side casing 40 and the head side casing 50 are made of separate members, for example, when the length of the shaft portion 22 is changed and it is desired to line up a plurality of torque wrenches 100 having different ranges (ranges recommended by the manufacturer). In addition, the casing 40 on the hand side can be shared, and the manufacturing cost can be reduced. Further, since both the hand-side casing 40 and the head-side casing 50 have tapered outer peripheral surfaces 42 and 52 inclined from the hand side toward the head side, when they are placed on a flat surface, they are placed on a flat surface. The grip portion 21 is inclined upward toward the end side, and a gap is formed between the flat surface and the grip portion 21 to facilitate gripping the grip portion 21.

<Other Embodiments> The light emitting unit may be installed in a casing on the head side and arranged at a position recognizable at the same time as the head. Specifically, the light emitting unit may be arranged at a position that can be visually recognized at the same time as the head by the operator performing the tightening work. Further, the light emitting unit may be installed in the casing on the head side and arranged in the vicinity of the head. Further, the light emitting portion is not limited to the one installed at the tip end portion of the head side casing, and may be installed at the intermediate portion or the base end portion (hand side) of the head side casing, for example.

The light emitting portion may have one light emitting surface L1 on the outer peripheral surface of the head-side casing, which is orthogonal to the axial direction of the handle portion and faces a predetermined direction. In this case, one light emitting surface is, for example, in the direction opposite to the direction in which the tightening target advances when the tightening target is tightened with a torque wrench so that the operator can easily see it during the tightening work. It should be installed so that it faces.

The light emitting unit may be provided with a plurality of light emitting surfaces facing different directions on the outer peripheral surface of the head-side casing. In this case, for example, a plurality of light emitting surfaces may be arranged at equal intervals in the circumferential direction of the outer peripheral surface.

The light emitting surface may be provided so as to slightly protrude from the outer peripheral surface of the head-side casing, or may be provided so as to be slightly recessed from the outer peripheral surface.

The light emission control unit may change the lighting interval of the light emitting body as the tightening torque value approaches the target value or the target value range. Specifically, the light emission control unit may be changed so that the lighting interval becomes shorter as the tightening torque value approaches the target value or the target value range. More specifically, the light emitting control unit changes the lighting interval of the light emitting body depending on whether the tightening torque value reaches the notice range or the tightening torque value reaches the target value range. There may be. For example, the light emission control unit may blink the light emitting body when the tightening torque value falls within the notice range, and continuously light the light emitting body when the tightening torque value falls within the target value range. Further, the light emission control unit may be one that changes the light emission color of the light emitting body and the lighting interval in combination. Further, the light emission control unit may change the amount of light of the light emitting body as the tightening torque value approaches the target value or the target value range. Further, when the light emitting control unit includes a plurality of light emitting bodies and light emitting surfaces, the number of lights of the light emitting body and the light emitting surface is increased as the tightening torque value approaches the target value or the target value range, and the light emitting area of the light emitting unit is increased. It may be something that changes. The light emission control unit may change other light emission modes of the light emitting body. In addition, the light emission control unit sets the advance notice range and target value range according to the difference between the lower limit value of the target value range and the tightening torque value, and the ratio or ratio of the tightening torque value to the lower limit value of the target value range. It may be.

In the torque wrench according to the first embodiment, the degree of tightening of the tightening target is notified to the operator by changing the light emitting mode of the light emitting unit, but even if the operator is further notified by the vibration of the vibration mechanism. good. In this case, in addition to the notification due to the change in the light emitting mode of the light emitting unit, the vibration mechanism may be configured to further vibrate and notify before the tightening torque value reaches the target value.

As another embodiment of the hand-side casing and the head-side casing, an embodiment as shown in FIG. 6 can be mentioned. The hand-side casing 40 and the head-side casing 50 shown in FIG. 6A both have a cylindrical shape. The head-side casing 50 is thinner than the hand-side casing 40. That is, the diameter of the head-side casing 50 is smaller than the diameter of the hand-side casing 40.

Further, both the hand-side casing 40 and the head-side casing 50 shown in FIG. 6B have a cylindrical shape, and have tapered outer peripheral surfaces 42 and 52. The inclination angle of the handle portion 20 of the outer peripheral surface 52 of the head-side casing 50 with respect to the axial direction is larger than the inclination angle of the handle portion 20 of the outer peripheral surface 42 of the hand-side casing 40 with respect to the axial direction.

The shape of the outer peripheral surface of the hand-side casing and the head-side casing may be different from each other. For example, the outer peripheral surface of the casing on the hand side may have a cylindrical shape, and the outer peripheral surface of the casing on the head side may have a tapered shape. Further, it may have other outer peripheral surface shapes.

Either or both of the hand-side casing and the head-side casing may have a non-circular cross-section, and may have, for example, a polygonal cross-section, an elliptical cross-section, or the like. Further, the casing on the hand side and the casing on the head side may have different cross-sectional shapes. In this case, when the tightening tool is placed on a flat surface, it becomes difficult to roll, for example, it becomes difficult to fall from the mounting surface of the work table.

As shown in FIG. 6C, the hand-side casing 40 and the head-side casing 50 may be arranged apart from each other. In this case, the head-side casing 50 may be installed at the tip of the handle portion 20. Further, another casing may be interposed between the hand-side casing and the head-side casing.

The hand-side casing and the head-side casing may be one casing integrally formed. In such a casing, the hand-side casing may be configured by the hand-side portion of one casing, and the head-side casing may be configured by the head-side (tip side) portion of one casing. Further, in this case, the light emitting unit may be installed closer to the tip of the casing than the display. Specifically, the light emitting portion is the head side (tip side) of the casing as compared with the distance between one end of the head side (tip side) of the display and the light emitting portion (specifically, one end of the head side of the light emitting portion). ) And the light emitting portion (specifically, one end on the head side of the light emitting portion) may be installed so as to be small.

In the first embodiment, the hand side casing and the head side casing are composed of a handle portion and a separate member, but either or both of the hand side casing and the head side casing are formed by a part of the handle portion. It may be configured. In this case, for example, the hand-side casing may be configured by the hand-side portion of the handle portion, and the head-side casing may be configured by the head-side portion of the handle portion.

In the first embodiment, the grip portion and the hand side casing are configured by separate members, but for example, the hand side of the hand side casing may be used as the grip portion.

In addition, the present invention is not limited to each of the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 Torque wrench 10 Head 20 Handle 21 Grip 22 Shaft 30 Torque sensor 40 Hand side casing 41 End surface 42 Outer surface 50 Head side casing 51 End surface 52 Outer surface 53 Tip part D Display L Light emitting part L1 Light emitting surface

Claims (9)

A head that engages with the tightening target is provided on the tip side, and a display that displays the tightening torque value of the tightening target engaged with the head is installed on the hand side casing provided on the hand side. It is a tool with a tool
A light emitting unit whose light emitting mode changes according to the difference between the tightening torque value and its target value, and
A head-side casing provided between the head and the hand-side casing is provided.
A tightening tool characterized in that the light emitting portion is installed in the head side casing. The tightening tool according to claim 1, wherein the light emitting portion is arranged closer to the rotation axis of the tightening target than the display in a state where the tightening target is engaged with the head. The tightening tool according to claim 1 or 2, wherein the light emitting portion is installed at the tip end portion of the head-side casing. The tightening tool according to any one of claims 1 to 3, wherein the light emitting portion is arranged at a position visible at the same time as the head. The head-side casing is tubular and has a tubular shape.
The tightening tool according to any one of claims 1 to 4, wherein the light emitting portion includes a plurality of light emitting surfaces facing different directions on the outer peripheral surface of the head-side casing. The head-side casing is tubular and has a tubular shape.
The tightening tool according to any one of claims 1 to 4, wherein the light emitting portion includes an annular light emitting surface provided over the entire circumference of the outer peripheral surface of the head-side casing. The tightening tool according to any one of claims 1 to 6, wherein the head-side casing is thinner than the hand-side casing. The tightening tool according to any one of claims 1 to 7, wherein the hand-side casing and the head-side casing are installed so as to be separated from each other. The tightening tool according to any one of claims 1 to 7, wherein the hand-side casing and the head-side casing are configured so that their outer peripheral surfaces are continuous with each other.

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