JP3155654U - Electric rotary tool - Google Patents

Abstract

The present invention provides an electric rotary tool that improves work efficiency when performing tightening / loosening operations such as bolts, nuts, and screws in opposite directions. A motor 3 having a motor shaft 4 and spindles 11a and 11b to which bit bodies such as a drill bit and a socket are attached are provided. There are two spindles, and one spindle 11 a and the other spindle 11 b are provided in the extending direction of the motor shaft 4 and in the opposite direction to the motor 3. [Selection] Figure 2

Description

  The present invention relates to an electric rotary tool that uses a motor as a power source and is used for tightening and loosening bolts, nuts, and screws.

  The electric rotary tool is often used for the work of tightening or loosening, for example, a screw, a bolt, or a nut, and the development of a reduction in size and weight is being promoted (see Patent Document 1). However, the conventional electric rotary tool has only one spindle on which a bit body such as a driver bit or a box wrench that engages with a screw, bolt, or nut to be tightened is mounted. The bit body can be attached by being directed only (see Patent Document 2).

JP 2006-000972 A Japanese Patent Application Laid-Open No. 7-100770

  In the conventional electric rotary tool in which the bit body is attached only in one direction (forward direction) as in the past, although it is reduced in size, it is not only in the front direction but also in the rear direction. In addition, when performing the tightening work of screws, bolts, nuts, etc. (sometimes referred to as “the object to be tightened” in this specification), the electric rotary tool itself must be reversed. However, there is a problem that work efficiency is lowered.

  The problem to be solved is that the work efficiency is lowered when a screw, bolt, nut or the like in the opposite direction is tightened.

  In the present invention, the spindle is provided not only in the front direction but also in the rear side so that the tightening work of the tightening object attached in the opposite direction of the space can be performed without changing the direction of the electric rotary tool. The most important feature is that the bit body can be attached in both the front and rear directions.

  That is, the electric rotary tool according to the present invention is an electric rotary tool including a motor (3) having a motor shaft (4) and spindles (11a, 11b) to which a bit body is attached. One spindle (11a) and the other spindle (11b) are provided in the extending direction of the motor shaft (4) and in the opposite direction to the motor (3).

  In the electric rotary tool according to the present invention, one spindle and the other spindle are provided in the extension direction of the motor shaft in the direction opposite to the motor. By attaching the, it is possible to perform the tightening work of the tightening object attached in the opposite direction in a narrow space without changing the direction of the electric rotary tool itself, so that the improvement of work efficiency can be achieved There is.

It is explanatory drawing which shows the structure of the electrically driven rotary tool which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the structure of the electrically driven rotary tool which concerns on the 2nd Embodiment of this invention.

  FIG. 1 shows a configuration of an electric rotary tool according to a first embodiment of the present invention. In the present embodiment, the electric rotary tool is exemplified with respect to the impact driver 1 in which torque is applied to the spindle shockingly by hammering of the hammer transmitted through the rotation of the motor.

  The housing 2 of the impact driver 1 is formed of a material such as synthetic resin, and as shown in FIG. 1, the lower part of the housing 2 (the upper side of the page in FIG. 1 is “upper” and the lower side is “lower”). The battery pack 27 is detachably attached to the lower end of the handle portion 26). Operation switches 23a and 23b are provided on the upper portion of the handle portion 26 at the front and rear (in FIG. 1, the left side is “front” and the right side is “rear”). A motor 3 that is a drive source is housed in a central portion of a main body housing portion (not shown) above the handle portion 26.

In front of the motor 3, a speed reducer 5a, which is a transmission mechanism that decelerates the rotation of the motor shaft 4 at a predetermined reduction ratio, and a hammer 7a to which the rotation of the motor shaft 4 is transmitted via the speed reducer 5a are rotatable. An anvil 9a that is attached and is struck by a hammer 7a, and a spindle 11a to which torque is applied impactively by the struck are provided. A spring 6a is interposed between the hammer 7a and the speed reducer 5a, and the hammer 7a is urged forward by the spring 6a.
A spindle 11a is attached to the anvil 9a toward the front, and a bit body that can be fitted to an object to be tightened (not shown) is detachably attached to a front end portion of the spindle 11a by a chuck 15a. In this embodiment, a drill bit 13a is illustrated as a bit body.

The anvil 9a and a hammer claw (not shown) provided at the front end of the hammer 7a are freely engageable. When the hammer 7a is retracted against the spring 6a, the hammer claw (not shown) and the anvil 9a When the hammer 7a moves forward with the force of the spring 6a, the hammer claw (not shown) and the anvil 9a are engaged.
The hammer 7a is hit when a predetermined force or more is applied between the hammer 7a and the anvil 9a, and the hammer 7a rotates more than a certain amount with respect to the anvil 9a. The striking torque of the spindle 11a is applied to the front tightening object (not shown) via the drill bit 13a.

  On the other hand, the rear of the motor 3 has the same mechanism as the front. That is, a speed reducer 5b that is connected to the rotary shaft 4 and decelerates the rotation at a predetermined speed reduction ratio, a hammer 7b to which the rotation of the motor 3 is transmitted via the speed reducer 5b, and between the hammer 7b and the speed reducer 5b. And an anvil 9b struck by a hammer 7b, and a spindle 11b to which a torque is applied shockably by the struck, and the hammer 7b is struck between the hammer 7b and the anvil 9b. Occurs when a force greater than a predetermined value is applied and the hammer 7b rotates more than a certain amount relative to the anvil 9b. The drill bit 13b is detachably mounted on the spindle 11b by the chuck 15b, and the impact torque of the spindle 11b is applied to the rear tightening object (not shown) via the drill bit 13b.

  The motor rotation speed detection means 17 is a means for detecting the rotation speed (number of rotations) of the motor 3 and is composed of a frequency generator that is attached to the motor 3 and generates a frequency signal proportional to the rotation speed of the motor 3. The advance angle of the anvil 9a, 9b for each impact is calculated from the advance angle of the motor 3 for each impact, and the advance angle of the motor 3 is calculated by integrating the rotational speed of the motor 3 over time. The advance angle of the anvils 9a and 9b is detected by providing an angle sensor for the anvils 9a and 9b. The impact driver 1 according to the present embodiment includes impact detection means 19a and 19b in order to detect the impact of the hammers 7a and 7b and the anvils 9a and 9b.

  The motor 3, the motor rotation speed detection means 17, and the impact detection means 19a and 19b are electrically connected to a control means 21 comprising a control circuit having a CPU. The control means 21 performs control to change the rotation speed of the motor 3 in accordance with the pull-in size of the operation switches 23a and 23b operated by the user. When the user operates the operation switch 23a, the spindle 3a rotates the motor 3 in a direction to tighten the front tightening object, and when the user operates the operation switch 23b, the spindle 11b rotates the motor in the direction to tighten the rear tightening object. 3 is rotated. The battery pack 25 is filled with a rechargeable battery that supplies power to the impact driver 1.

  In the impact driver 1 according to the present invention, since the spindle 11b is attached not only to the front of the motor but also to the rear, the drill bits 13a and 13b can be attached to the spindles 11a and 11b, respectively. Therefore, since the drill bits 13a and 13b can be mounted not only on the front tip portion of the impact driver 1 but also on the rear tip portion, a tightening operation of a tightening object (not shown) facing in the opposite direction in a narrow space. When performing the operation, it is possible to save the trouble of changing the direction of the impact driver 1 itself. That is, the front tightening object is tightened or loosened with the drill bit 13a at the front end, and the rear tightening object is tightened with the drill bit 13b at the rear end without changing the direction of the impact driver 1 itself. There is an advantage that the work efficiency is improved by performing the loose work.

  FIG. 2 shows a configuration of an electric rotary tool according to the second embodiment of the present invention. 2, the same components as those used in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, the electric rotary tool is an electric impact wrench 10, and a fastening object (not shown) such as a hexagon bolt is attached to the front end portion of the spindle 11 a provided in front of the motor 3 by a chuck 15 a. ) Is detachably attached to the socket 33a. The striking torque of the spindle 11a is applied to the front tightening object (not shown) via the socket 33a.
On the other hand, a spindle 11b is also provided behind the motor 3, and a socket 33b is detachably attached to the spindle 11b. The impact torque of the spindle 11b is applied to the rear object to be tightened (not shown) via the socket 33b.

  Since the impact wrench 10 according to the present invention has the spindle 11b attached not only to the front but also to the rear of the motor 3, sockets 33a and 33b can be attached to the spindles 11a and 11b, respectively. For this reason, since the sockets 33a and 33b can be mounted not only on the front tip portion of the impact wrench 10, but also on the rear tip portion, the tightening operation of a tightening target object (not shown) in the opposite direction in a narrow space. When performing the operation, without changing the direction of the impact wrench 10 itself, the object to be tightened at the front is tightened with the socket 33a at the front tip, and the object to be tightened at the rear is tightened with the socket 33b at the rear tip. Thus, there is an advantage that the working efficiency is improved, and particularly, when nuts such as an orthogonal clamp, a universal clamp, a joint, and a bracket used for the hypothetical scaffold are common.

  As the electric rotary tool according to the present invention, not only the impact driver 1 and the impact wrench 10 but also an electric driver or wrench having no impact function can be used. Moreover, not only a rechargeable type but also an electric rotary tool that uses AC power supplied from a household outlet as a power source can be used.

  The electric rotary tool according to the present invention can be applied to an electric screwdriver used for tightening and tightening work such as screws and an impact wrench used for tightening and tightening work such as bolts and nuts.

DESCRIPTION OF SYMBOLS 1 Impact driver 2 Hazing 3 Motor 4 Motor shaft 5a, 5b Reduction gear 6a, 6b Spring 7a, 7b Hammer 9a, 9b Anvil 10 Impact wrench 11a, 11b Spindle 13a, 13b Drill bit 15a, 15b Chuck 17 Motor rotational speed detection means 19a , 19b Impact detection means 21 Control means 23a, 23b Operation switch 26 Handle part 27 Battery pack 33a, 33b Socket

Claims (2)

An electric rotary tool comprising a motor (3) having a motor shaft (4) and spindles (11a, 11b) for attaching a bit body,
There are two spindles,
One spindle (11a) and the other spindle (11b) are provided in the extending direction of the motor shaft (4) and in the opposite direction to the motor (3).   The electric rotary tool according to claim 1, wherein the bit body is a drill bit or a socket.

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