JP2010110834A - Electric power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance usability by enabling the use of a handle in a more flexible form. <P>SOLUTION: The handle 13 is rotatably connected to the rear end of the housing 2 of an electric drill 1 around a connecting shaft 12. The connecting part includes a regulating means 20 comprising a lock ring 21 externally fitted to the connecting shaft 12 within a cylindrical part 15 so as not to enable rotation and so as to enable sliding forwards/backwards and engaged with a front flange 18 in the advancing position, a coil spring 22 energizing the lock ring 21 to the retracting position, and an operation knob 23 sliding the lock ring 21 to the advancing position in a first rotating position to regulate the rotation of the handle 13 and sliding the lock ring 21 to the retracting position in a second rotating position to release the regulation of the rotation of the handle 13. Thus, the rotation of the handle 13 can be optionally regulated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric tool such as an electric drill provided with a handle at a rear end of a housing.

  Some electric tools such as electric drills are provided with a handle at the rear end of a housing provided with a motor, a speed reduction mechanism, and the like. That is, the handle is gripped by one hand and the housing is directly supported by the other hand, or the side handle provided on the housing is gripped to support the electric tool and perform operations such as drilling. As the handle, there are known a fixed type in which the handle is fixed at a fixed angle with respect to the housing as described in Patent Document 1, and a rotary type in which the handle can be rotated at a predetermined angle as described in Patent Document 2, respectively. It has been.

US Pat. No. 2,468,469 JP-A-61-100381

  As described above, since the conventional handle is only one of fixed and rotating, it cannot be said that it is sufficient for usability in any case. In other words, depending on changes in work content and posture, there are cases where you want to change the direction of the handle even with the fixed type, or conversely, you may want to use the rotary type with the orientation fixed temporarily. It was impossible.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electric tool that can be used in a more flexible manner and has excellent usability.

In order to achieve the above object, according to the first aspect of the present invention, a handle is rotatably connected to the rear end of the housing about an axis in the front-rear direction of the housing, and the handle is rotated to the connecting portion. It is characterized in that a restricting means capable of arbitrarily restricting operation is provided.
According to a second aspect of the present invention, in the configuration of the first aspect, in order to easily form the restricting means in a space-saving manner, a connecting shaft projects from the rear end of the housing, and an exterior is attached to the connecting shaft at the front end of the handle. The handle is rotatably connected by providing a possible cylindrical portion and having the cylindrical portion externally mounted on the connecting shaft in a state where the flange formed on the cylindrical portion is engaged with the concave groove formed on the connecting shaft. On the other hand, the restricting means is mounted on the connecting shaft in the cylindrical portion so as not to rotate, and can be slid between a forward position engaged with the flange and a retracted position away from the flange, and the lock ring is moved to the retracted position. An urging means for urging and provided behind the lock ring in the tubular portion so as to be capable of rotating, and in the first rotation position, the lock ring is slid to the forward position against the urging of the urging means. To restrict the rotation of the handle, the second It is characterized in that it has formed from the cam member for releasing the rotation restriction of the rotation by sliding the lock ring to the retracted position position the handle.
According to a third aspect of the present invention, in the configuration of the first aspect, in order to easily form the restricting means in a space-saving manner, a connecting shaft projects from the rear end of the housing, and the exterior of the connecting shaft is provided at the front end of the handle. The handle is rotatably connected by providing a possible cylindrical portion and having the cylindrical portion externally mounted on the connecting shaft in a state where the flange formed on the cylindrical portion is engaged with the concave groove formed on the connecting shaft. On the other hand, the restricting means is externally mounted on the connecting shaft in the cylindrical portion so as not to rotate, and can be slid between a forward position that engages with the flange and a backward position that allows the rotation of the flange, and the lock ring. An urging means for urging to the forward movement position and provided behind the lock ring in the cylindrical portion so as to be capable of rotating operation. The lock ring is pushed to the forward movement position at the first rotation position to restrict the rotation of the handle. The lock ring in the second rotational position It is characterized in that it has formed from the cam member to cancel the permit sliding of the lock ring rotation restricting the handle to release the pressing retracted position.

According to the first aspect of the present invention, by providing the restricting means for the handle that is rotatably connected, the direction of the handle can be changed from the fixed state in accordance with the change of work content or posture, Conversely, the handle can be used in a more flexible manner, such as temporarily fixing the orientation from the rotation free state. Therefore, it is excellent in usability.
According to the second and third aspects of the invention, in addition to the effect of the first aspect, the regulating means can be easily formed in a space-saving manner.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
FIG. 1 is a longitudinal sectional view of an electric drill which is an example of an electric tool. The electric drill 1 has a motor 3 inside a housing 2 and a speed reduction mechanism 5 that rotates the spindle 4 by driving the motor 3. A chuck 6 on which a bit can be attached and detached is provided at the tip of the spindle 4 that protrudes forward of the housing 2 (left side in FIG. 1). Reference numeral 7 denotes a lower handle connected downward at an intermediate portion of the housing 2, and a switch 8 having a forward / reverse switching button 9 provided in front is provided inside. Further, an upward auxiliary grip 10 is detachably connected to the upper surface of the intermediate portion of the housing 2.

  Then, at the rear end of the housing 2, a rear cover 11 having a connecting shaft 12 coaxial with the spindle 4 protruding rearward is integrally screwed as a part of the housing, and a handle 13 is attached to the connecting shaft 12. ing. As shown in FIGS. 2 and 3, the handle 13 has a D-shape in a side view formed by assembling a pair of left and right halves 14 and 14, and a cylindrical portion 15 that is externally mounted on the connecting shaft 12 is formed at the front end. The upper and lower grip portions 16 are formed at the rear ends. That is, by assembling each of the half dies 14, 14 so that the connecting shaft 12 is sandwiched between the front ends, the handle 13 is connected to be rotatable about the connecting shaft 12 on the axis of the spindle 4. A front flange 18 that engages with a ring-shaped concave groove 17 formed at the base of the connecting shaft 12 is formed at the front end of the cylindrical portion 15 to prevent the handle 13 from coming off in the assembled state. The front flange 18 is formed with a plurality of lock holes 19, 19,... At equal intervals on a concentric circle.

Further, between the connecting shaft 12 and the handle 13, a restricting means 20 capable of arbitrarily restricting the rotation of the handle 13 is provided. The restricting means 20 includes a lock ring 21 that is externally mounted on the connecting shaft 12 in the cylindrical portion 15, a coil spring 22 that is externally applied to the connecting shaft 12 and biases the lock ring 21 backward, An operation knob 23 as a cam member provided behind the lock ring 21 in the shape portion 15 so as to be rotatable.
First, as shown in FIG. 4A, the lock ring 21 is rotated by fitting a through hole 24 formed in the center with a two-sided width portion provided in the rear part of the connecting shaft 12. It can slide back and forth in a restricted state. On the outer periphery of the front surface of the lock ring 21, a plurality of claws 25, 25... That can be inserted into the respective lock holes 19 at the forward position in phase with the lock hole 19 of the front flange 18 are projected. Are provided with three arc-shaped projections 26, 26,... At equal intervals on a concentric circumference. The front and rear surfaces in the circumferential direction of each protrusion 26 are inclined downward toward the rear surface of the lock ring 21.

  Next, as shown in FIG. 4B, the operation knob 23 has a disk shape that fits into the cylindrical portion 15, the connection shaft 12 abuts on the front surface, and the rear end of the cylindrical portion 15 on the outer periphery of the rear surface. When the rear flange 27 formed in is engaged, it is rotatably held behind the connecting shaft 12. On the outer periphery of the front surface of the operation knob 23, three arc-shaped cam projections 28, 28,... Are projected at equal intervals on the concentric circumference, like the projection 26 of the lock ring 21. The front and rear surfaces in the circumferential direction of the cam protrusions 28 are also inclined downward toward the front surface of the operation knob 23. Reference numeral 29 denotes a knob that protrudes from the center of the rear surface of the operation knob 23 and is exposed rearward in the rear flange 27.

  Therefore, the lock ring 21 comes into contact with the operation knob 23 by the bias of the coil spring 22. Here, as shown in FIG. 5, when the operation knob 23 is in a phase (first rotational position) where each cam projection 28 overlaps each projection 26 in the front-rear direction, the lock ring 21 resists the bias of the coil spring 22. Then, the claw 25 is inserted into the lock hole 19 of the front flange 18 in the forward position. Therefore, the rotation of the handle 13 is locked. On the contrary, as shown in FIG. 1, when the operation knob 23 is in a phase (second rotational position) in which each cam projection 28 is located between the projections 26, 26 of the lock ring 21, the lock ring 21 is connected to the coil spring 22. The handle 13 is free to rotate because the pawl 25 is separated from the lock hole 19 of the front flange 18 by being biased.

In the electric drill 1 configured as described above, it is possible to select the rotation free state and the fixed state of the handle 13 by rotating the operation knob 23. That is, when the operation knob 23 is rotated to the second rotation position where each cam projection 28 is located between the projections 26 and 26 as shown in FIG. 1, the lock ring 21 is in the retracted position as described above, and the front flange is located. 18 is not engaged. Therefore, it is possible to use the handle 13 by gripping the grip portion 16 and rotating the handle 13 to an arbitrary angle.
On the other hand, when the operation knob 23 is rotated to the first rotation position as shown in FIG. 5, the cam protrusions 28 move in the circumferential direction and come into contact with the protrusions 26 of the lock ring 21, and are guided by the inclined surfaces. As the projection 26 relatively rides on the cam projection 28, the lock ring 21 slides to the forward position. Therefore, the claw 25 is inserted into the lock hole 19 of the front flange 18 and the handle 13 can be used in a state of being fixed at the angle.

  As described above, according to the electric drill 1 of the first aspect, the handle 13 is rotatably connected to the rear end of the housing 2 around the connecting shaft 12, and the handle 13 is arbitrarily rotated to the connecting portion. By providing the restricting means 20 capable of restricting operation, either the rotation free state or the fixed state of the handle 13 can be arbitrarily selected. Therefore, the handle 13 can be used in a more flexible manner, such as changing the orientation of the handle 13 from the fixed state or conversely temporarily fixing the orientation from the rotation-free state according to changes in work content or posture, etc. And it will be easy to use.

  In particular, here, the tubular portion 15 is externally attached to the connecting shaft 12 in a state where the front flange 18 formed on the tubular portion 15 of the handle 13 is engaged with the concave groove 17 formed on the connecting shaft 12. The restricting means 20 is externally mounted on the connecting shaft 12 in the cylindrical portion 15 so as to be non-rotatable, and is connected between a forward position engaged with the front flange 18 and a retracted position away from the front flange 18. A slidable lock ring 21, a coil spring 22 that urges the lock ring 21 to the retracted position, and provided behind the lock ring 21 in the cylindrical portion 15 so as to be rotatable. In the first rotational position, The lock ring 21 is slid to the forward position against the bias of the coil spring 22 to restrict the rotation of the handle 13, and the lock ring 21 is slid to the reverse position at the second rotational position. 3 rotation restricting it formed from the operation knob 23 for releasing the regulation means 20 is in the easily formable in a space-saving.

[Form 2]
Next, another embodiment of the present invention will be described. However, since the structure of the electric drill is the same as that of Form 1, the regulating means will be mainly described. Also, in the restricting means, the same components are denoted by the same reference numerals and redundant description is omitted.
FIG. 6 is an explanatory view showing the rear cover 11 having the connecting shaft 12 and the handle 13, and the restricting means 30 here is similarly connected to the connecting shaft 12 by fitting two widths in the cylindrical portion 15. It is formed of a lock ring 32 that is externally mounted in a non-rotatable state and can be engaged with a lock plate 31 provided on the front flange 18 in the forward position, a coil spring 33 that biases the lock ring 32 forward, and an operation knob 23. ing.

First, as shown in FIG. 7 (A), the lock plate 31 is formed with triangular locking projections 34, 34 at two upper and lower positions, and locked to each half mold 14 in the assembled state of the handle 13. It is a ring-shaped plate body that is held in a non-rotating state, and on the rear surface thereof, chevron-shaped rotating teeth 35, 35,.
Further, as shown in FIG. 7B, the lock ring 32 is not a claw on the front surface, and is similar to the rotating teeth 35 of the lock plate 31 and has angle-shaped fixed teeth 36, 36,. However, it is projected in a continuous manner on the same circumference and the same number as the rotation teeth 35.

  Therefore, the lock ring 32 is urged forward by the coil spring 33, and the fixed tooth 36 is always meshed with the rotating tooth 35 of the lock plate 31. In this state, when the operation knob 23 is in a phase (first rotational position) where each cam projection 28 overlaps the projection 26 of the lock ring 32 in the front-rear direction as shown in FIG. Retraction is restricted in a state in which is engaged with the rotating tooth 35. On the other hand, when the operation knob 23 is in a phase (second rotational position) in which each cam projection 28 is located between the projections 26, 26, as shown in FIG. It can be retracted until it leaves 35.

In the electric drill 1 configured as described above, when the operation knob 23 is rotated to the second rotation position in FIG. 6 where each cam projection 28 is located between the projections 26, 26, the lock ring 32 as described above. Is in a forward position where the fixed teeth 36 are engaged with the rotating teeth 35 of the lock plate 31 by the bias of the coil spring 33. However, since the backward movement of the lock ring 32 is not restricted, when the grip portion 16 is gripped from here and the handle 13 is rotated, the fixed tooth 36 gets over the rotation tooth 35 relatively as shown in FIG. Is retracted against the bias of the coil spring 33. Therefore, the handle 13 can be rotated to an arbitrary angle.
On the other hand, when the operation knob 23 is rotated from here to the first rotational position in FIG. 9, each cam projection 28 moves in the circumferential direction and has the same phase as the projection 26 of the lock ring 32, and the lock ring 32 is retracted. regulate. Therefore, even if it is going to rotate handle 13, since fixed tooth 36 cannot get over rotating tooth 35, handle 13 will be in the state fixed at the angle concerned.

  Thus, also in the electric drill 1 of the said form 2, while connecting the handle | steering-wheel 13 centering | focusing on the connection shaft 12 with the rear end of the housing 2, rotation of the handle | steering-wheel 13 is arbitrarily controlled by the said connection part. By providing the control means 30 that can be operated, either the rotation free state or the fixed state of the handle 13 can be arbitrarily selected. Therefore, the handle 13 can be used in a more flexible manner, such as changing the orientation of the handle 13 from the fixed state or conversely temporarily fixing the orientation from the rotation-free state according to changes in work content or posture, etc. It becomes. Therefore, it is excellent in usability.

  In particular, the regulating means 30 is externally mounted on the connecting shaft 12 in the cylindrical portion 15 so as not to rotate, and is slidable between a forward position that engages with the front flange 18 and a backward position that allows rotation of the front flange 18. A lock ring 32, a coil spring 33 that urges the lock ring 32 to a forward position, and a rear portion of the lock ring 32 in the cylindrical portion 15 are provided so as to be rotatable. The lock ring 32 is provided at the first rotational position. To the forward position to restrict the rotation of the handle 13, release the pressure of the lock ring 32 at the second rotational position, allow the lock ring 32 to slide to the reverse position, and release the restriction of the rotation of the handle 13. By forming from the operation knob 23, the regulating means 30 can be easily formed in a space-saving manner. Here, since the rotation angle of the handle 13 can be determined by the engagement of the rotation teeth 35 of the lock plate 31 and the fixed teeth 36 of the lock ring 32, the angle is smaller than that in the first mode by the engagement between the claw and the lock hole. There is an advantage that the direction of the handle 13 can be selected.

In addition, the form of the lock ring and the cam member is not limited to the first and second forms. It can be changed. In particular, in Embodiment 2, it is possible to eliminate the lock plate and form the rotating teeth directly on the flange.
In the cam members in the first and second embodiments, the lock ring is slid by the linkage between the protrusion and the cam protrusion. Of course, the number of the protrusions can be changed, and either one of the protrusions can be formed into a pin or hemispherical shape. The design can be changed as appropriate. The biasing means may also use another elastic body such as a disc spring. Further, the rear cover may be formed integrally with the housing.
In addition, the power tool is not limited to a drill, and the present invention can be adopted even if it is another type such as a hammer or a hammer drill.

It is a longitudinal cross-sectional view of the electric drill of the form 1 (a handle is a rotation free state). It is a plane explanatory view of a handle part. It is explanatory drawing of a handle | steering-wheel, the left shows the partial view from the front of a cylindrical part, and the right shows the whole, respectively. (A) is a lock ring, (B) is explanatory drawing of an operation knob, respectively, the left shows a front, the center shows a cross section, and the right shows a back. It is explanatory drawing of a handle | steering-wheel part (rotation restricted state). It is explanatory drawing of the handle | steering-wheel part of the form 2 (rotation free state). (A) is a lock plate, (B) is an explanatory view of a lock ring, the left shows the front, the center shows the cross section, and the right shows the back, respectively. It is explanatory drawing of a handle | steering-wheel part (rotation free state). It is explanatory drawing of a handle | steering-wheel part (rotation restricted state).

Explanation of symbols

  1 .... Electric drill, 2 .... Housing, 3 .... Motor, 11 .... Rear cover, 12 .... Connecting shaft, 13 .... Handle, 14 .... Half type, 15 .... Cylinder, 16 .... Grip part, 17 ··· Groove, 18 · · Front flange, 19 · · Lock hole, 20, 30 · · Restricting means 21, 32 · · Lock ring, 22, 33 · · Coil spring, 23 · · Control knob, 25 ·· Claw, 26 ·· Projection, 28 · · Cam projection, 31 · · Lock plate, 35 · · Rotating tooth, 36 · · Fixed tooth

Claims (3)

A power tool provided with a handle at the rear end of the housing,
The handle is rotatably connected to the rear end of the housing about an axis in the front-rear direction of the housing, and restriction means capable of arbitrarily restricting the rotation of the handle is provided at the connection portion. A featured electric tool. A connecting shaft projecting from the rear end of the housing, and a cylindrical portion that can be externally mounted on the connecting shaft is provided at the front end of the handle, and a flange formed in the cylindrical portion is formed in the connecting groove. While connecting the handle to the connecting shaft, the cylindrical portion is externally connected to the connecting shaft.
A lock ring which is externally mounted on the connecting shaft in the cylindrical portion so as not to rotate, and is slidable between a forward position engaged with the flange and a retracted position away from the flange; and the lock ring An urging means for urging to the retracted position; and provided behind the lock ring in the tubular portion so as to be capable of rotating operation, wherein the lock ring is urged by the urging means at the first rotation position. The cam member is configured to slide against the forward movement position to restrict the rotation of the handle, and to slide the lock ring to the backward position at the second rotation position to release the rotation restriction of the handle. The power tool according to claim 1. A connecting shaft projecting from the rear end of the housing, and a cylindrical portion that can be externally mounted on the connecting shaft is provided at the front end of the handle, and a flange formed in the cylindrical portion is formed in the connecting groove. While connecting the handle to the connecting shaft, the cylindrical portion is externally connected to the connecting shaft.
A lock ring which is externally mounted on the connecting shaft in the cylindrical portion so as not to rotate, and is slidable between a forward position engaged with the flange and a reverse position allowing rotation of the flange; An urging means for urging the lock ring to the forward movement position, and provided behind the lock ring in the cylindrical portion so as to be rotatable, and pressing the lock ring to the forward movement position at the first rotation position. A cam member that restricts rotation of the handle, releases the lock ring at a second rotation position, allows the lock ring to slide to the retracted position, and releases the rotation restriction of the handle. The power tool according to claim 1, wherein the power tool is formed.

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