JP2007105831A - Vibrating drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrating drill capable of achieving a reduction in the number of components, improvement in assembly workability, and cost reduction while maintaining original mode switching functions. <P>SOLUTION: The vibrating drill is composed as follows. A change shaft 21, in which a plane part 21a is partially formed on the outer periphery, is rotatably provided at the rear of a spindle. A linear movement of a knob 22 is converted to rotational movement of the change shaft 21. The change shaft 21 is moved between a first position where the plane part 21a of the change shaft 21 faces the rear of the spindle and a second position where the plane part 21a retreats from the rear of the spindle. Consequently, an operation mode of the vibrating drill is switched to a vibrating drill mode or a drill mode. The knob 22 is protrudingly provided with a columnar protrusion 22a. The columnar protrusion 22a is engaged with a protrusion 21b protrudingly provided on the shaft end face of the change shaft 21. The linear movement of the knob 22 is converted to the rotational movement of the change shaft 21 with the engagement between the columnar protrusion 22a and the protrusion 21b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration drill capable of switching an operation mode to a drill mode or a vibration drill mode.

  Some vibration drills can select a drill mode that gives only rotation to the spindle as an operation mode and a vibration drill mode that gives both rotation and vibration, and such a vibration drill has a mode for switching the operation mode. A switching device is provided.

  FIG. 8 shows a partial side cross-section of a conventional vibration drill 1 equipped with a mode switching device. As shown in the figure, the spindle 3 has both axial ends in the housing 2 of the vibration drill 1 and a ball bearing 4. The bearing 5 is supported and accommodated so as to be rotatable and movable in the axial direction (front-rear direction). A drill chuck 6 is attached to the tip of the spindle 3 that protrudes forward (downward in FIG. 8) from the housing 2, and a tip tool (drill bit) 7 is detachably attached to the drill chuck 6. Has been.

  A ratchet 8 is attached to the rear of the ball bearing 4 of the spindle 3, and another ratchet 9 facing the ratchet 8 is fixed to the housing 2. Here, a plurality of teeth are engraved on the opposing surfaces of both ratchets 8-9, and the spindle 3 is always moved forward (both ratchets 8, 9) by a spring 10 that is compressed between the two ratchets 8-9. 9) (the direction in which the 9 teeth are separated).

  Here, the configuration of the rotational drive system of the spindle 3 will be described.

  Integrated in the axial direction intermediate portion of the spindle 3 are spline-fitted slidable gears 11 and 12 having different diameters in an axial direction (front-rear direction).

  A motor 13 as a drive source is built in the housing, and a pinion 15 is engraved at the tip of an output shaft (motor output shaft) 14 extending forward of the motor 13. A cooling fan 16 is attached to the motor output shaft 14, and the motor 13 is cooled by cooling air induced by the rotation of the cooling fan 16 together with the motor output shaft 14.

  Further, an intermediate shaft 17 parallel to the spindle 3 and the motor output shaft 14 is rotatably supported and accommodated in the housing 2, and large, medium and small gears 18, 19 and 20 are provided on the intermediate shaft 17. It has been. The gear 18 is meshed with the pinion 15 formed at the tip of the motor output shaft 14, and the transmission gears 12, 11 spline-fitted to the spindle 3 are selectively meshed with the gears 19, 20. As a result, the rotational speed of the spindle 3 is switched between high speed and low speed.

  Next, the configuration of the mode switching device will be described with reference to FIG. FIG. 9 is a perspective view showing the configuration of the mode switching device.

  As shown in FIG. 8, in the vicinity of the rear end portion of the spindle 3, the change shaft 21 inserted into the insertion hole 2 a of the housing 2 is around its axis (around the axis perpendicular to the spindle 3). A knob 22 for rotating the change shaft 21 is provided on the upper portion of the housing 2 so as to be linearly movable in the lateral direction (perpendicular to the plane of FIG. 8). A leg 22A is integrally formed at the lower part of the knob 22, and two columnar protrusions 22a are stepped along the moving direction of the knob 22 (arrow direction in FIG. 9). Projected to

  Here, as shown in detail in FIG. 9, a part of the outer periphery of the change shaft 21 is cut into a concave groove shape to form a flat portion 21 a, and a round bar-like shape is formed on the upper portion of the change shaft 21. The lever 23 is press-fitted. The lever 23 extends toward the knob 22, and an end thereof is engaged and held between the two columnar protrusions 22 a provided on the leg 22 A of the knob 22. As shown in FIG. 8, the knob 22 is linearly connected to the housing 2 via the plate-like switching display member 24 in a state where the operation portion is exposed to the outside of the housing 2 and the leg portion 22 </ b> A is accommodated in the housing 2. It is supported movably.

  Thus, although the mode switching device is constituted by the change shaft 21, the knob 22, the lever 23, etc., as shown in FIG. 8, the rear end portion of the spindle 3 is connected to the outer periphery of the change shaft 21 via the steel ball 25. It selectively abuts against the surface or flat surface portion 21a.

  Next, the operation of the vibration drill 1 configured as described above will be described below with reference to FIGS. 8 and 10 to 12. 10 (a) and 10 (b) are partially broken plan views for explaining the mode switching operation by the mode switching device, FIG. 11 is a partial side sectional view showing the state of the vibration drill in the vibration drill mode, and FIG. It is a fragmentary sectional side view which shows the state at the time of the drill mode of the vibration drill.

  When the motor 13 is energized and driven during the drilling operation using the vibration drill 1, the output shaft 14 rotates when the transmission gear 12 is engaged with the gear 19 as shown in FIG. The gears 18 and 19 and the transmission gear 12 are decelerated and transmitted to the spindle 3, and the spindle 3, the drill chuck 6 attached to the spindle 3, and the tip tool 7 are rotationally driven at a predetermined speed. When the transmission gears 11 and 12 are slid forward along the spindle 3 by a shift mechanism (not shown) and the large-diameter transmission gear 11 is engaged with the small-diameter gear 20, the rotation of the motor output shaft 14 is further increased. The speed is reduced and transmitted to the spindle 3, and the spindle 3, the drill chuck 6 and the tip tool 7 are rotationally driven at a low speed.

  Here, when the knob 22 is moved in the direction of the arrow in FIG. 10A, the lever 23 engaged with and held by the two cylindrical protrusions 22a protruding from the leg portion 22A of the knob 22 is press-fitted. The change shaft 21 is rotated in the direction of the arrow shown in the figure (counterclockwise), and the flat portion 21a formed on the change shaft 21 is the rear end of the spindle 3 as shown in FIG. 8, FIG. 10 (a) and FIG. Opposite the part. Accordingly, in this state, the spindle 3 can move in the axial direction until the steel ball 25 contacts the flat portion 21a of the change shaft 21 as shown in FIG. When the tip tool 7 is pressed against the workpiece (not shown), the reaction force causes the spindle 3 to recede against the urging force of the spring 10 and, as shown in FIG. 11, the ratchet 8 fixed to the spindle 3. Are engaged with the teeth of the ratchet 9 fixed to the housing 2. Accordingly, when the spindle 3 rotates in this state, rotation and vibration are simultaneously applied to the spindle 3 due to the interference between the teeth of the two ratchets 8 and 9, so that the vibration drill mode in which the tip tool 7 vibrates while rotating as the operation mode. Is selected.

  Next, to switch the operation mode from the vibration drill mode to the drill mode, the knob 22 is moved in the direction of the arrow in FIG. Then, the lever 23 engaged and held by the two cylindrical protrusions 22a projecting from the leg 22A of the knob 22 and the change shaft 21 formed by press-fitting the lever 23 are in the direction indicated by the arrow (clockwise) in FIG. ) And the flat portion 21a formed on the change shaft 21 is retracted from a position facing the rear end portion of the spindle 3 as shown in FIGS. Accordingly, in this state, as shown in FIG. 12, the steel ball 25 contacts the outer peripheral surface of the change shaft 21, and the spindle 3 is restricted from moving in the axial direction, and the axial position is fixed to the forward limit. Therefore, the teeth of the ratchet 8 fixed to the spindle 3 are detached from the teeth of the ratchet 9 on the housing 2 side, and the meshing of both teeth is released.

  In the above state, the spindle 3 only rotates, and no vibration is applied thereto. Therefore, the operation mode is switched to the drill mode in which the tip tool 7 only rotates.

By the way, various proposals have been made so far as a mode switching device of a vibration drill. For example, in Patent Document 1, in order to increase the degree of freedom of an operation place related to mode switching, an operation amount of a knob is set as a gear transmission mechanism. A structure for transmitting to a change shaft via a link mechanism has been proposed.
JP 2002-263930 A

  The conventional mode switching device shown in FIG. 9 includes three parts: a change shaft 21, a lever 23 press-fitted into the change shaft 21, and a knob 22 for rotating the change shaft 21 via the lever 23. Since it is configured, the number of parts is increased, and the press-fitting work of the lever 23 to the change shaft 21 is required. Therefore, there is a problem that the assemblability is poor and the cost is increased. Also in the vibration drill proposed in Patent Document 1, the same problem occurs because the mode switching device is provided with a gear transmission mechanism and a link mechanism.

  The present invention has been made in view of the above problems, and the object of the processing is a vibrating drill capable of reducing the number of parts, improving the assemblability and reducing the cost while maintaining the original mode switching function. It is to provide.

  In order to achieve the above object, according to a first aspect of the present invention, a spindle driven to rotate by a motor is provided in the housing so as to be movable in the front-rear direction, and the first ratchet attached to the spindle is a housing. A change shaft having a concave flat portion formed on a part of the outer periphery thereof is rotatably provided behind the spindle so that the knob is linearly moved. The change shaft is converted into a rotational movement of the change shaft between a first position where the flat portion faces the rear of the spindle and a second position where the flat portion retreats from the rear of the spindle. Move to provide rotation and vibration to the spindle at the first position and to provide rotation only to the spindle at the second position In a vibration drill configured to be selectively removable, a convex portion is formed on at least one of the knob and the shaft end surface of the change shaft, and the convex portion is engaged with a convex portion or a concave portion provided on the other side. The engagement of the two converts the linear movement of the knob into a rotational movement of the change shaft.

  According to a second aspect of the present invention, in the first aspect of the present invention, a linear protrusion is formed on the shaft end surface of the change shaft, and the protrusion is engaged with two protrusions formed on the leg portion of the knob. It is characterized by that.

  According to a third aspect of the present invention, in the first aspect of the invention, a long hole is formed in the shaft end surface of the change shaft, and a protrusion projecting from the leg portion of the knob is engaged with the long hole. It is characterized by that.

  According to the present invention, the convex portion formed on at least one of the shaft end surface of the knob and the change shaft is engaged with the convex portion or the concave portion provided on the other, and the linear movement of the knob is caused by the engagement of both. Since it is directly converted into a rotational motion, parts such as levers that have been required in the past are no longer required, and press-fitting work such as levers is also unnecessary.As a result, the number of parts of the mode switching device is reduced, Assemblability is improved and cost reduction is achieved. Since the change shaft is rotated by the operation of the knob and selectively moved to the first position and the second position, the mode switching function is not impaired.

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

<Embodiment 1>
FIG. 1 is a perspective view of an oscillating drill 1, and the illustrated oscillating drill 1 includes a housing 2 having a lateral L shape when viewed from the side, in which a rotation drive mechanism is housed and rotated or rotated by the rotation drive mechanism. The spindle 3 to which rotation and vibration are applied extends from the front end of the housing 2 to the outside. A drill chuck 6 is attached to the tip of the spindle 3, and a tip tool (drill bit) 7 is detachably attached to the drill chuck 6.

  An electric cord 26 is led out from the distal end portion of the handle portion 2A of the housing 2, and an ON / OFF switch 27 is provided at the base end portion of the handle portion 26A, and a speed switch is provided at one side portion of the housing 2. A dial 28 is rotatably provided. Further, a sub handle 29 is attached to the outer peripheral portion of the front end of the housing 2, and the drilling operation by the vibration drill 1 is performed in a state where the handle portion 2A of the housing 2 and the sub handle 29 are held with both hands.

  Here, the configuration and operation of the mode switching device according to Embodiment 1 of the present invention and the vibration drill including the mode switching device are shown in FIGS.

  2 is a partial side sectional view showing a state of the vibration drill in the vibration drill mode, FIG. 3 is a partial side sectional view showing a state of the vibration drill in the drill mode, FIG. 4 is a perspective view of the mode switching device, and FIG. (A), (b) is a partially broken plan view explaining mode switching operation by the mode switching device.

  Since the vibration drill 1 according to the present embodiment is the same as the conventional vibration drill 1 shown in FIGS. 8, 11 and 12 except for the mode switching device, the description thereof will be omitted. 2 and 3, the same elements as those shown in FIGS. 8, 11 and 12 are denoted by the same reference numerals.

  Hereinafter, the mode switching device and the operation according to the present embodiment will be described.

  In the mode switching device according to the present embodiment, as shown in detail in FIGS. 4 and 5, the linear movement direction of the knob 22 (the direction of the arrow in FIGS. 4 and 5) is formed on the bottom surface of the leg portion 22 </ b> A of the knob 22. ) Are protruded integrally with two cylindrical protrusions 22a whose positions are shifted. Further, a linear protrusion 21b that passes through the axis of the change shaft 21 is integrally formed on one end face (upper surface in FIG. 4) of the change shaft 21, and is formed on both side surfaces of the protrusion 21b. The columnar protrusions 22a provided on the knob 22 are engaged with each other. Here, as shown in FIG. 5, the two cylindrical protrusions 22a on the knob 22 side are at different positions on the both side surfaces of the protrusion 21b on the change shaft 21 side (positions that are different in the length direction of the protrusion 21b). The change shaft 21 is engaged at a position eccentric from the center of rotation.

  Thus, the operation mode of the vibration drill 1 is switched to the vibration drill mode or the drill mode as follows by the mode switching device having the above configuration.

  That is, when the knob 22 is moved in the direction of the arrow in FIG. 5A, one of the columnar protrusions 22a projecting from the leg portion 22A of the knob 22 slides on the side surface of the protrusion 21b of the change shaft 21 while sliding. In order to press the side surface, the change shaft 21 rotates in the direction indicated by the arrow (counterclockwise) about its axis, and the flat portion 21a formed on the chain shaft 21 is shown in FIGS. 2 and 5 (a). As shown in FIG. 2, the spindle 3 moves to a first position facing the rear end. Therefore, in this state, since the spindle 3 can move in the axial direction until the steel ball 25 contacts the flat portion 21a of the change shaft 21, the operator grasps the vibration drill 1 and removes the tip tool 7. When pressed against the workpiece to be illustrated, the reaction force causes the spindle 3 to retreat against the urging force of the spring 10, and the teeth of the ratchet 8 fixed to the spindle 3 are teeth of the ratchet 9 fixed to the housing 2. To mesh. Accordingly, when the spindle 3 rotates in this state, rotation and vibration are simultaneously applied to the spindle 3 due to the interference between the teeth of the two ratchets 8-9. Therefore, as the operation mode, the vibration drill mode in which the tip tool 7 vibrates while rotating. Is selected.

  Next, in order to switch the operation mode from the vibration drill mode to the drill mode, the knob 22 is moved in the direction of the arrow in FIG. Then, the other of the cylindrical protrusions 22a protruding from the leg portion 22A of the knob 22 presses the side surface while sliding on the side surface of the protrusion 21b of the change shaft 21, so that the change shaft 21 is centered on its axis. A second position in which the flat portion 21a formed in the chain shaft 21 retreats from the rear end portion of the spindle 3 as shown in FIG. 3 and FIG. Move to. Therefore, in this state, as shown in FIG. 3, the steel ball 25 is in contact with the outer peripheral surface of the change shaft 21, and the spindle 3 is restricted from moving in the axial direction and the axial position is fixed at the forward limit. The teeth of the ratchet 8 fixed to the spindle 3 are detached from the teeth of the ratchet 9 on the housing 2 side, and the meshing of both teeth is released.

  In the above state, the spindle 3 only rotates, and no vibration is applied thereto. Therefore, the operation mode is switched to the drill mode in which the tip tool 7 only rotates.

  Thus, in the mode switching device according to the present embodiment, the two columnar protrusions 22a protruding from the leg 22A of the knob 22 are engaged with both side surfaces of the protrusion 21b formed on the shaft end surface of the change shaft 21. In addition, since the linear movement of the knob 22 is directly converted into the rotational movement of the change shaft 21, parts such as the lever 23 (see FIG. 9), which has been conventionally required, become unnecessary, and the change of the lever 23, etc. The press-fitting work to the shaft 21 is also unnecessary. As a result, the number of parts of the mode switching device is reduced, the assemblability is improved, and the cost is reduced. Since the change shaft 21 is rotated by the operation of the knob 22 and selectively moved to the first position and the second position, the original function of the mode switching device is not impaired.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is a perspective view of the mode switching device according to the present embodiment, and FIGS. 7A and 7B are partially broken plan views for explaining the mode switching operation by the mode switching device.

  In the mode switching device according to the present embodiment, as shown in FIGS. 6 and 7, a pin-like projection 22 b is integrally projected toward the change shaft 21 on the bottom surface of the leg portion 22 </ b> A of the knob 22. . Further, a long hole 21c that is long in the radial direction is formed in one shaft end surface (the upper surface in FIG. 6) of the change shaft 21, and the pin-like protrusion protruding from the knob 22 is formed in the long hole 21c. 22b is engaged. Here, as shown in FIG. 7, the pin-like protrusion 22 b on the knob 22 side is engaged at an eccentric position of the elongated hole 21 c on the change shaft 21 side (a position eccentric from the rotation center of the change shaft 21).

  Thus, the operation mode of the vibration drill 1 is switched to the vibration drill mode or the drill mode as follows by the mode switching device having the above configuration.

  That is, when the knob 22 is moved in the direction of the arrow in FIG. 7A, the pin-like protrusion 22b projecting from the leg portion 22A of the knob 22 slides in the elongated hole 21c of the change shaft 21, and the elongated hole 21c. In order to press the side surface, the change shaft 21 rotates in the direction of the arrow shown in the figure (counterclockwise) about its axis, and although not shown, the flat surface portion 21a formed on the chain shaft 21 is It moves to the 1st position which opposes a rear-end part, and the operation mode is switched to vibration drill mode similarly to the above.

  Next, to switch the operation mode from the vibration drill mode to the drill mode, the knob 22 is moved in the direction of the arrow in FIG. Then, the pin-shaped protrusion 22b protruding from the leg portion 22A of the knob 22 presses the side surface of the long hole 21c while sliding in the long hole 21c of the change shaft 21, so that the change shaft 21 is centered on the axis. As shown in the figure, the plane portion 21b formed on the chain shaft 21 moves to the second position where it is retracted from the rear end of the spindle, and the operation mode vibrates in the same manner as described above. Switch from drill mode to drill mode.

  Thus, also in the mode switching device according to the present embodiment, the pin-shaped protrusion 22b protruding from the leg portion 22A of the knob 22 is engaged with the elongated hole 21c formed in the shaft end surface of the change shaft 21, Since the linear movement of the knob 22 is directly converted into the rotational movement of the change shaft 21, parts such as the lever 23 (see FIG. 9) that have been required in the past are not necessary, and the lever 23 is attached to the change shaft 21. The press-fitting work is not necessary, and the same effect as in the first embodiment can be obtained.

It is a perspective view of the vibration drill which concerns on this invention. It is a fragmentary sectional side view which shows the state at the time of the vibration drill mode of the vibration drill which concerns on Embodiment 1 of this invention. It is a fragmentary sectional side view which shows the state at the time of the drill mode of the vibration drill with which Embodiment 1 of this invention is provided. 1 is a perspective view of a mode switching device according to Embodiment 1 of the present invention. (A), (b) is a partially broken top view explaining the mode switching operation by the mode switching apparatus based on Embodiment 1 of this invention. It is a perspective view of the mode switching apparatus which concerns on Embodiment 2 of this invention. (A), (b) is a partially broken top view explaining the mode switching operation by the mode switching apparatus based on Embodiment 2 of this invention. It is a fragmentary sectional side view which shows the state at the time of the vibration drill mode of a vibration drill provided with the conventional mode switching device. It is a perspective view of the conventional mode switching device. (A), (b) is a partially broken top view explaining the mode switching operation by the conventional mode switching apparatus. It is a fragmentary sectional side view which shows the state at the time of the vibration drill mode of a vibration drill provided with the conventional mode switching device. It is a fragmentary sectional side view which shows the state at the time of the vibration drill mode of a drill provided with the conventional mode switching device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibrating drill 2 Housing 3 Spindle 4 Ball bearing 5 Bearing part 6 Drill chuck 7 Tip tool (drill bit)
8 Ratchet (first ratchet)
9 Ratchet (second ratchet)
DESCRIPTION OF SYMBOLS 10 Spring 11, 12 Transmission gear 13 Motor 14 Motor output shaft 15 Pinion 16 Cooling fan 17 Intermediate shaft 18-20 Gear 21 Change shaft 21a Plane part of change shaft 21b Projection (convex part) of change shaft
21c Long hole (recessed part) of change shaft
22 Knob 22A Knob leg 22a Knob cylindrical protrusion (convex)
22b Knob pin projection (convex)
23 Lever 24 Switching display member 25 Steel ball 26 Electric cord 27 ON / OFF switch 28 Speed switching dial 29 Sub handle

Claims (3)

A spindle driven to rotate by a motor is provided in the housing so as to be movable in the front-rear direction, and the spindle is urged in a direction in which the first ratchet attached to the spindle is separated from the second ratchet fixed to the housing. In addition, a change shaft having a concave flat portion formed on a part of the outer periphery thereof is rotatably provided behind the spindle, and the linear movement of the knob is converted into the rotation motion of the change shaft to The plane portion is moved between a first position facing the rear of the spindle and a second position where the plane portion is retracted from the rear of the spindle, and the spindle rotates and vibrates at the first position. And a vibration drill configured to selectively move so as to give only rotation to the spindle in the second position. Stomach,
A convex part is formed on at least one of the shaft end surface of the knob and the change shaft, the convex part is engaged with a convex part or a concave part provided on the other, and the linear movement of the knob is caused by the engagement of the both. A vibration drill characterized by being converted into a rotating motion.   2. The vibration drill according to claim 1, wherein a linear protrusion is formed on the shaft end surface of the change shaft, and the protrusion is engaged with two protrusions formed on a leg portion of the knob.   2. The vibration drill according to claim 1, wherein an elongated hole is formed in the shaft end surface of the change shaft, and a protrusion projecting from a leg portion of the knob is engaged with the elongated hole.

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