JP2020082281A - Rotary tool and engaging member provided therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate screw tightening work by a rotary tool while surely preventing screw galling and suppressing cost. A rotary tool (impact wrench) includes a main body having a motor and a drive switch (trigger 42) that is slidably provided with respect to the main body and changes the rotation speed of the motor according to the amount of slide. An engaging portion (engaging surface 45a of the engaging member 45, which engages with the trigger 42 and the main body in the sliding direction when the slide amount of the trigger 42 is gradually increased to reach a predetermined value smaller than the maximum value. An engaging portion 44c) of the switching lever 44 is provided. [Selection diagram] FIG. 6

Description

The present invention relates to a rotary tool such as an impact wrench for tightening screws such as bolts and nuts.

In an assembly process of an automobile or the like, an operator sometimes uses a rotary tool such as an impact wrench to tighten bolts and nuts. A rotary tool used in such an assembling process is generally capable of adjusting the rotation speed of the motor according to the operation amount (retraction amount) of the trigger. That is, when the trigger pull-in amount is small, the motor rotates at a low speed, and as the trigger pull-in amount increases, the motor rotation speed increases.

When the bolt is tightened using the rotary tool as described above, seizure (screw galling) occurs unless the bolt and the screw hole are coaxially set. When the screw galling occurs, it is necessary to repair the screw thread, and since it is not possible to repair the severe screw galling, it is necessary to replace the parts. In either case, the man-hour and the material cost increase. In order to avoid such a problem, the operator keeps the trigger at a small retracted amount and rotates the motor at a low speed at the beginning of tightening the bolt, and adjusts the posture of the rotary tool to adjust the bolt and the screw hole. It is necessary to engage the screws of both with coaxially arranged. However, such work is not easy. In particular, depending on the location, it may not be possible to directly face the surface to which the bolt is attached, or it may be necessary to work with a rotating tool with your non-dominant hand.In such a case, keep the trigger at the specified retracted amount. However, it is very difficult to hold the rotary tool in a predetermined posture and normally engage the bolt and the screw hole, and it requires proficiency.

For example, in the rotary tool disclosed in Patent Document 1 below, the motor rotates at a low speed during an initial drive period until a predetermined time elapses after the start of driving the motor, and the motor rotates at a high speed after the initial drive period elapses. It is controlled to automatically switch to rotation. In this case, since it is not necessary to maintain the trigger with a small pull-in amount in the initial stage of tightening the bolt, the bolt tightening work becomes easy.

JP, 2016-78230, A

However, when controlling the switching from low-speed rotation to high-speed rotation of the motor in time as described above, if the bolt cannot be normally engaged with the screw hole during low-speed rotation, it will automatically change to high-speed rotation. Since it switches, screwing may occur. Further, in order to control the rotation speed of the motor with time as described above, it is necessary to change the control program of the motor and the like, which is costly.

Therefore, an object of the present invention is to reliably prevent screw galling and to facilitate screwing work of a screw by a rotary tool while suppressing cost.

In order to solve the above problems, the present invention provides a rotary tool including a main body having a motor, and a drive switch slidably provided with respect to the main body and changing a rotation speed of the motor according to a slide amount. And
Provided is a rotary tool, wherein the drive switch and the main body are provided with engaging portions that engage with each other in a sliding direction when a slide amount of the drive switch reaches a predetermined value smaller than a maximum value.

With this rotary tool, when the drive switch is operated and the amount of slide reaches a predetermined value, the engagement portion provided on the main body and the engagement portion provided on the drive switch engage with each other to operate the drive switch. Is given resistance. By holding the drive switch at a position where the operator feels resistance, the worker can easily maintain the motor at a low speed, so that the work of normally engaging the screws in the initial stage of tightening becomes easy. In this case, it is not necessary to change the control program, so that the cost can be suppressed. Further, since the worker can slide the drive switch stepwise by his/her intention, it is possible to prevent a situation in which the motor rotation speed is automatically switched to a high speed and screwing occurs.

The body of the rotary tool may be provided with a switching lever that switches the rotation direction of the motor between a positive direction in which the screw is tightened and a reverse direction in which the screw is loosened. If the switching lever is provided with the engagement portion on the main body side, the number of parts can be reduced and the cost can be reduced as compared with the case where a separate member having the engagement portion is provided.

When the operator confirms that the screws are normally engaged, the engagement between the drive switch side engagement part and the main body side engagement part is released, and the drive switch slide amount is further increased, thereby Can be rotated at high speed. At this time, the play provided in the support mechanism that supports the slide of the drive switch is used to move the drive switch in the direction orthogonal to the slide direction so that the engagement between both engagement portions is released. If so, the mechanism for releasing the engagement of both the engaging portions can be simplified.

For example, a drive switch for a general rotary tool that includes a main body having a motor and a drive switch that is slidable with respect to the main body and that changes the rotation speed of the motor according to the amount of slide According to the present invention, if an engaging member having an engaging portion that engages with the engaging portion provided in the main body in the sliding direction is attached when the slide amount of the switch reaches a predetermined value smaller than the maximum value, The above rotary tool can be obtained.

As described above, in the rotary tool of the present invention, the rotation speed of the motor is not automatically switched by control, but the slide amount of the drive switch, that is, the rotation speed of the motor can be adjusted by the intention of the operator. It is possible to reliably prevent screw galling while suppressing costs. Further, the drive switch can be easily held with a predetermined slide amount by mechanical engagement between the drive switch side engagement portion and the main body side engagement portion, so that the screw can be normally engaged with each other easily. Be converted.

It is a side view of a rotary tool. It is a partial cross section side view of the drive switch mechanism provided in the said rotary tool. It is a top view of the said drive switch mechanism, and shows the state which regulates rotation of a motor. It is a top view of the drive switch mechanism, and shows a state in which the motor is rotated in the forward direction (the direction in which the screw is tightened). It is a top view of the said drive switch mechanism, and shows the state which rotates a motor in the reverse direction (the direction which loosens a screw). FIG. 5 is a top view of the drive switch mechanism of FIG. 4, showing a state in which the engagement member of the trigger and the engagement portion of the switching lever are engaged. The state which further pulled the trigger of the drive switch mechanism of FIG. 6 is shown. The state which pulled the trigger of the drive switch mechanism of FIG. 7 further is shown. It is a top view of the engagement member which concerns on other embodiment. It is a top view of the engagement member which concerns on other embodiment.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the impact wrench 1 as a rotary tool according to the present embodiment mainly includes a main body 10 and a battery 20 that is detachable from the main body 10. Inside the case 11 of the main body 10, a motor 12, a reduction mechanism 13 for reducing the rotation of the motor 12, a striking mechanism 14 for applying a striking force to the rotation output from the reduction mechanism, and a rotation speed of the motor 12 are controlled. And a control unit 15 that operates. Various tools (for example, socket 30) are attached to the output shaft of the striking mechanism 14. In this embodiment, as shown in FIG. 1, the rotation axis direction of the motor 12 (hereinafter referred to as “motor axis direction”) is horizontal, and the motor 12 is on the upper side and the battery 20 is on the lower side. Each part will be described with 10 arranged. At this time, the direction orthogonal to both the motor axial direction (the horizontal direction in FIG. 1) and the vertical direction (the direction orthogonal to the paper surface of FIG. 1) is called the width direction.

The impact wrench 1 has a drive switch mechanism 40 for an operator to operate. The drive switch mechanism 40 includes a switch body 41 fixed to the case 11 of the body 10, a trigger 42 as a drive switch slidably provided in the motor axial direction with respect to the body 10, and a width direction with respect to the body 10. And a changeover switch 43 slidably provided. The trigger 42 projects forward (left side in FIG. 1) from the case 11 of the main body 10, and the changeover switch 43 projects laterally from the case 11 of the main body 10 in the width direction.

As shown in FIG. 2, the switch main body 41 includes a housing 41a, a slide shaft 41b that is reciprocally attached to the housing 41a in the motor axial direction, and a vertical direction that is rotatably attached to the housing 41a. Rotating shaft 41c of. Inside the housing 41a, a bearing 41d that supports the slide shaft 41b, a slide amount detection unit 41e that detects the slide amount of the slide shaft 41b, and a switching sensor 41f that switches depending on the rotation angle of the rotation shaft 41c are provided. The slide shaft 41b and the bearing 41d constitute a support mechanism that supports the slide of the trigger 42. The slide shaft 41b is biased by a biasing means (not shown) toward the side projecting forward from the housing 41a, that is, the side retracting the trigger 42 (left side in FIG. 2).

The trigger 42 has a main body 42a that is pressed by an operator, a mounting portion 42b that is mounted on the slide shaft 41b of the switch main body 41, and a locking piece 42c. In this embodiment, the main body portion 42a, the mounting portion 42b, and the locking piece 42c are integrally formed of resin.

When the operator pulls the trigger 42 against the biasing force of the biasing means and slides the trigger 42 toward the side approaching the switch body 41 (right side in FIG. 2), the motor 12 is rotationally driven. At this time, the slide amount of the trigger 42, that is, the slide amount of the slide shaft 41b is detected by the slide amount detection unit 41e, and the signal is transmitted to the control unit 15, and the motor 12 is rotated at a rotation speed corresponding to the slide amount of the trigger 42. To rotate. Specifically, when the slide amount of the trigger 42 exceeds a predetermined value, the rotation of the motor 12 is started, the rotation speed of the motor 12 is gradually increased as the slide amount of the trigger 42 increases, and the slide amount of the trigger 42 is When the maximum value is reached, the rotation speed of the motor 12 becomes maximum.

A switching lever 44 is attached to the rotary shaft 41c of the switch body 41. The switching lever 44 has a lever main body 44a, a pin 44b protruding upward from the lever main body 44a, and an engaging portion 44c extending downward from the tip of the lever main body 44a. In the illustrated example, the lever main body 44a, the pin 44b, and the engaging portion 44c are integrally molded of resin. The pin 44b of the switching lever 44 is inserted into an elongated hole 43a provided in the switching switch 43. The changeover switch 32 and the changeover lever 44 rotate the motor 12 in the reverse direction (see FIG. 3), the normal rotation position (see FIG. 4) in which the motor 12 rotates in the forward direction, and the reverse direction in which the motor 12 rotates. It can be moved to and from the reverse rotation position (see FIG. 5).

As shown in FIG. 3, when the changeover switch 43 is arranged at the rotation restricting position, the engaging portion 44c of the changeover lever 44 and the locking piece 42c of the trigger 42 oppose each other in the sliding direction, and these engage with each other. As a result, the retracting operation of the trigger 42 (sliding toward the side approaching the switch body 41) is restricted. At this time, before the rotation of the motor 12 is started, the locking piece 42c of the trigger 42 and the engagement portion 44c of the switching lever 44 are engaged with each other, so that the rotation start of the motor 12 is restricted.

When the changeover switch 43 is slid to the normal rotation position shown in FIG. 4, the elongated hole 43a of the changeover switch 43 and the pin 44b of the changeover lever 44 are engaged with each other, and the changeover lever 44 is turned around the rotation shaft 41c. Rotate clockwise. At this time, as the rotary shaft 41c rotates, the switching sensor 41f of the switch body 41 operates, the signal is transmitted to the control unit 15, and the rotation direction of the motor 12 is set to the forward direction (direction in which the screw is tightened). .. At this time, the engaging portion 44c of the switching lever 44 is displaced to the one side in the width direction with respect to the locking piece 42c of the trigger 42, and is arranged at a position not engaged in the sliding direction, so that the trigger 42 can slide. It is in a state of. Therefore, when the operator pulls in the trigger 42, the motor 12 rotates in the forward direction.

When the changeover switch 43 is slid to the reverse rotation position shown in FIG. 5, the changeover lever 44 rotates in the clockwise direction in the drawing around the rotation shaft 41c. At this time, as the rotary shaft 41c rotates, the switching sensor 41f of the switch body 41 operates, the signal thereof is transmitted to the control unit 15, and the rotation direction of the motor 12 is the reverse direction (screw loosening direction). .. At this time, the engaging portion 44c of the switching lever 44 is displaced to the other side in the width direction with respect to the locking piece 42c of the trigger 42, and is arranged at a position not engaged in the sliding direction, so that the trigger 42 can slide. It is in a state of. Therefore, when the operator pulls the trigger 42, the motor 12 rotates in the opposite direction.

The above is the basic configuration of the impact wrench 1, and the engagement member 45 that is a characteristic configuration of the present invention will be described below.

As shown in FIGS. 2 and 3, the trigger 42 is provided with an engagement member 45. The engagement member 45 is housed in the main body portion 42a of the trigger 42 and is fixed to the locking piece 42c by an appropriate means such as adhesion. The engaging member 45 has an engaging surface 45a as an engaging portion which engages with the engaging portion 44c of the switching lever 44 arranged in the normal rotation position shown in FIG. 4 in the sliding direction. The engagement surface 45a is, for example, a flat surface orthogonal to the sliding direction. In the illustrated example, a locking piece 42c is provided at the center of the main body 42a of the trigger 42 in the width direction, and an engaging surface 45a is provided on one side in the width direction. Between the engaging member 45 and the side wall of the main body portion 42a of the trigger 42, a widthwise gap G into which the engaging portion 44c of the switching lever 44 can enter is provided.

When the trigger 42 is pulled in with the switching lever 44 placed in the normal rotation position shown in FIG. 4 and a predetermined operation amount is exceeded, the motor 12 starts to rotate. After that, the rotation speed of the motor 12 gradually increases as the retracted amount of the trigger 42 increases. Then, as shown in FIG. 6, when the engagement surface 45 a of the engagement member 45 provided on the trigger 42 comes into contact with the engagement portion 44 c of the switching lever 44, resistance is given to the operation of the trigger 42 and the trigger 42. Stops (this position is called "intermediate position"). At this time, the position of the engagement surface 45a is set so that the rotation speed of the motor 12 is sufficiently low (for example, 5 rotations/second or less).

In this way, by mechanically engaging the engagement member 45 and the switching lever 44 with resistance to the operation of the trigger 42, the operator easily holds the trigger 42 at the intermediate position where there is resistance. be able to. As a result, the motor 12 can be rotated at a low speed and at a constant speed without requiring a highly difficult operation for holding the trigger 42 at a delicate position, so that the work of normally engaging the bolt and the screw of the screw hole can be performed. Facilitated.

Then, when the operator confirms that the screw of the bolt and the screw of the screw hole are normally meshed with each other, the engagement between the engagement member 45 of the trigger 42 and the engagement portion 44c of the switching lever 44 is released, Pull the trigger 42 further than the intermediate position. In the present embodiment, the engagement between the engagement member 45 of the trigger 42 and the engagement portion 44c of the switching lever 44 is released by pulling the trigger 42 with a predetermined force or more. Specifically, between the support mechanism that supports the slide of the trigger 42, that is, the slide shaft 41b of the switch body 41 and the bearing 41d (see FIG. 2) that supports the slide shaft 41b (see FIG. 2), a direction (radial direction) orthogonal to the slide direction. ) Is provided, and the play can be used to move the trigger 42 in the direction orthogonal to the sliding direction (the width direction in the illustrated example. Specifically, the engaging surface 45a of the engaging member 45). When the operator pulls in the trigger 42 while the engaging portion 44c of the switching lever 44 is engaged, the slide shaft 41b inclines and the trigger 42 moves to the other side in the width direction (upper side in the figure). The engagement between the engagement surface 45a of the coupling member 45 and the engagement portion 44c of the switching lever 44 is released (see FIG. 7).

When the trigger 42 is further retracted, as shown in FIG. 8, the engaging portion 44c of the switching lever 44 fits into the gap G between the engaging member 45 and the side wall of the main body portion 42a of the trigger 42. As a result, the trigger 42 slides beyond the intermediate position, and the motor 12 rotates at high speed. Then, when the bolt is tightened to a predetermined position, a torque larger than a predetermined torque is applied to the motor 12, and the rotation of the motor 12 is stopped by detecting this torque.

On the other hand, when the switching lever 44 is arranged in the reverse rotation position (see FIG. 5), the engaging surface 45a of the engaging member 45 and the engaging portion 44c of the switching lever 44 are displaced in the width direction from the beginning. They do not engage in the sliding direction, and the trigger 42 can be pulled up to the maximum value without resistance. Since it is only necessary to keep the motor 12 rotating at a low speed when tightening the screw (that is, when rotating the screw in the forward direction), engagement of the trigger 42 is required when rotating in the reverse direction as described above. By reducing the resistance when operating the trigger 42 without engaging the member 45 and the engaging portion 44c of the switching lever 44, the burden on the operator is reduced.

The present invention is not limited to the above embodiment. Hereinafter, duplicated description of the same points as those in the above embodiment will be omitted.

The shape of the engaging member 45 is not limited to the above, and may be, for example, as shown in FIG. 9, a shape in which the locking pieces 42c of the trigger 42 are held from both sides in the width direction. Thereby, the engagement member 45 can be more firmly fixed to the trigger 42. Specifically, the engaging member 45 has a first portion 45b provided on one side in the width direction of the locking piece 42c (lower side in the drawing) and a first portion 45b on the other side in the width direction of the locking piece 42c (upper side in the drawing). It is provided with a second portion 45c provided and a third portion 45d that connects the first portion 45b and the second portion 45c. An end surface 45b1 on the main body side (right side in the drawing) of the first portion 45b functions as an engagement surface 45a that engages with the engagement portion 44c of the switching lever arranged in the normal rotation position. The body-side end surface 45c1 of the second portion 45c has a smaller widthwise dimension than the body-side end surface 45b1 of the first portion 45b. As a result, the end surface 45c1 of the second portion 45c does not engage with the engaging portion 44c of the switching lever arranged in the reverse rotation position, or even if it engages, the trigger 42 slightly shifts to the one side in the width direction. The engagement is released with.

In the embodiment shown in FIG. 10, the engagement surface 45a of the engagement member 45 is an inclined surface that is inclined toward one side in the width direction (lower side in the drawing) toward the side where the trigger 42 retracts (left side in the drawing). It Accordingly, when the engagement portion 44c of the switching lever 44 engages with the engagement surface 45a of the engagement member 45, the engagement member 45 easily moves to the other side in the width direction (upper side in the drawing). The pull-in force of the trigger 42 required for releasing is reduced.

In the above embodiment, the case where the engaging member 45 and the trigger 42 are configured as separate members has been described, but they may be integrally formed of resin, for example. Alternatively, an engaging member having the above-described function may be provided on the main body side (for example, the switch main body 41) and engaged with the trigger 42 (for example, the locking piece 42c).

1 Impact wrench (rotary tool)
10 main body 11 case 12 motor 13 reduction mechanism 14 striking mechanism 15 control unit 20 battery 30 socket 40 drive switch mechanism 41 switch body 41b slide shaft 42 trigger (drive switch)
42c Locking piece 43 Changeover switch 44 Changeover lever 44a Lever body 44c Engaging portion 45 Engaging member 45a Engaging surface (engaging portion)

Claims (3)

A rotary tool comprising a main body having a motor, and a drive switch slidably provided with respect to the main body, the drive switch changing the rotation speed of the motor according to a sliding amount,
A rotary tool, wherein the drive switch and the main body are provided with engaging portions that engage with each other in a sliding direction when the slide amount of the drive switch is gradually increased and reaches a predetermined value smaller than a maximum value. The main body is provided with a switching lever for switching the rotation direction of the motor,
The rotary tool according to claim 1, wherein the switching lever is provided with an engaging portion on the main body side. An engagement member that is attached to the drive switch of a rotary tool that includes a main body having a motor and a drive switch that is slidable with respect to the main body and that changes the rotation speed of the motor according to the amount of slide. hand,
An engaging member having an engaging portion that engages with an engaging portion provided on the main body in a sliding direction when a slide amount of the drive switch reaches a predetermined value smaller than a maximum value.

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