JP2008155353A - Hammer drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent damage of an operating member during work, etc. <P>SOLUTION: A projecting part 26 is provided on a side surface on an operation part 23 side in a gear housing 5. The projecting part 26 is formed to be higher than a projecting height from the side surface of the gear housing 5 of the operation part 23 at a front end and an upper position of a moving range of the operation part 23. By the projecting part 26 and a vertical direction projecting line 27 projectingly provided in the rear of the side surface of the gear housing 5, a saving space 28 for storing the operation part 23 in the inner side than a flat surface S when the projecting part 26 side is directed downward and is placed on the flat surface S, is formed on the side surface of the gear housing 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hammer drill capable of transmitting a rotation operation and a striking operation individually or simultaneously to a bit attached to the tip of a housing.

  In the hammer drill, a bit such as a drill bit or chisel can be attached to the tip of the housing via a chuck or the like. Inside the housing, a rotation mechanism that transmits the rotation of the motor to rotate the bit, and the rotation of the motor A drill mode that converts the rotation mechanism into a reciprocating motion of the piston and directly or indirectly hits the bit, and switches operation transmission from the rotation mechanism and the hitting mechanism to the bit to transmit only rotation to the bit. There is provided a switching mechanism capable of selecting a plurality of operation modes such as a hammer mode for transmitting only a hit and a hammer drill mode for transmitting a rotation and a hit at the same time. The operation of this switching mechanism is performed by an operating member such as a change lever provided outside the housing, but the operating member can be operated with the other hand while holding the handle of the hammer drill with one hand. As disclosed in Patent Documents 1 to 3 so that the operation member can be easily removed, an operation member provided on the side surface of the housing is known.

Design Registration No. 1280931 Design Registration No. 10922227 Design Registration No. 1282586

  In the above hammer drill, since the operation member protrudes from the side surface of the housing, for example, when performing chipping on a wall or the like, the hammer drill jumps forward and the operation member collides with the wall. There was a risk of damage during work or storage, such as damage or damage to the operation member that was down when the hammer drill was placed on the floor.

  Therefore, an object of the present invention is to provide a hammer drill that can effectively prevent damage to an operation member during work and has excellent durability.

In order to achieve the above object, according to the first aspect of the present invention, at least at the front end or the front position of the movement range of the operation member on the side surface of the housing, a protrusion that is higher than the protrusion height from the side surface of the operation member is provided. And a retreating space for accommodating the operation member inside the flat surface when the protrusion is placed on a flat surface with the protruding portion side down on the side surface of the housing.
According to the second aspect of the present invention, in addition to the object of the first aspect, in order to obtain a buffering effect at the protruding portion, at least the tip portion of the protruding portion is formed of an elastic material.

According to the first aspect of the present invention, it is possible to effectively prevent the operation member from being damaged during work or storage by forming the protruding portion and the retreat space, and an improvement in durability can be expected.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a buffering effect can be obtained when the projecting portion collides with another object. It also protects itself.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial longitudinal sectional view showing an example of a hammer drill, FIG. 2 is a sectional view taken along line AA, and the hammer drill 1 is rotated in front of a motor housing 4 incorporating a motor 2 (left side in the figure). A gear housing 5 housing the mechanism 6 and the striking mechanism 7 is connected, and a tool holder 8 provided with a chuck 9 and having a detachable bit 10 is pivotally supported in front of the gear housing 5.
The rotation mechanism 6 is spline-coupled to the intermediate shaft 11 on the rear side of a second gear 13 that meshes with a gear 12 provided on the tool holder 8 on an intermediate shaft 11 that is supported in parallel with the output shaft 3 of the motor 2. It is biased toward the meshing side with the clutch cam 14. Accordingly, when the intermediate shaft 11 is rotated by the rotation of the output shaft 3, the rotation of the clutch cam 14 and the second gear 13 is transmitted to the tool holder 8 via the gear 12, and the bit 10 is rotated.

  The striking mechanism 7 connects the rod 16 of the swash bearing 15, which is externally mounted on the intermediate shaft 11 behind the clutch cam 14, to the rear end of the piston cylinder 17 that is loosely inserted into the tool holder 8 with a striker 18. An impact bolt 19 is provided in the tool holder 8 in front of the striker 18. Therefore, when the intermediate shaft 11 is rotated by the rotation of the output shaft 3, the swash bearing 15 is rotated via the clutch cam 14, and the rotation is converted into a reciprocating motion of the piston cylinder 17. Due to the reciprocating motion of the piston cylinder 17, the striker 18 reciprocates by the action of an air spring and strikes the impact bolt 19, so that the bit 10 that is in contact with the impact bolt 19 in the state of being mounted on the tool holder 8 indirectly. Be blown.

  As shown in FIG. 2, a switching mechanism 20 is slidable along the intermediate shaft 11 and is urged rearward to engage the second gear 13 and the clutch cam 14, and the change plate 21. And a change lever 22 as an operation member for changing the slide position. The sliding position of the change plate 21 causes the clutch cam 14 to move forward and away from the swash bearing 15 and engage with only the second gear 13 (drill mode). The second gear 13 moves forward and away from the clutch cam 14 to change. The position where the clutch 21 engages with the plate 21 and only the swash bearing 15 meshes with the clutch cam 14 (hammer mode), the second gear 13 moves forward, and only the swash bearing 15 meshes with the clutch cam 14. It is possible to select a position where the tool holder 8 is free to rotate away from the position 13 (neutral mode) and a position where the second gear 13 and the swash bearing 15 mesh with the clutch cam 14 (hammer drill mode).

  As shown in FIGS. 3 and 4, the change lever 22 exposes an operation portion 23 that can be rotated and operated within a range of about 180 ° along the side surface of the gear housing 5 around the lower portion, outside the gear housing 5. is doing. Here, the rotation position of FIG. 5A where the operation unit 23 faces forward is the drill mode, the rotation position of FIGS. 3 and 4 facing upward is the hammer drill mode, and the rotation position of FIG. 5B facing rear is the hammer mode. The neutral mode is between the hammer drill mode and the hammer mode. In addition, a lock button 24 that protrudes toward the upper end side at each mode position and engages with an engagement portion 25 provided on the gear housing 5 to hold the rotation position is provided inside the operation portion 23. Therefore, when the lock button 24 is pushed in and the locking with the locking portion 25 is released, the operation portion 23 can be rotated.

  A protrusion 26 is provided on the side surface of the gear housing 5 on the change lever 22 side. The protruding portion 26 is formed to be higher than the protruding height of the operating portion 23 from the side surface of the gear housing 5 at the front end and the upper position of the moving range of the operating portion 23. As shown in FIG. 6, a flat surface with the protruding portion 26 side down is formed on the side surface of the gear housing 5 by the protruding portion 26 and an up-and-down protrusion 27 projecting rearward of the side surface of the gear housing 5. When placed on S, a retreat space 28 is formed in which the operation portion 23 is accommodated inside the flat surface S (side surface side of the gear housing 5).

In the hammer drill 1 configured as described above, since the protruding portion 26 is provided in front of the operation portion 23 of the change lever 22, the hammer drill 1 is surplus when performing wall chipping work or the like. Even if it comes into contact with a wall or the like, the operating portion 23 is protected by the protruding portion 26, and the operating portion 23 is not directly damaged and damaged.
On the other hand, since the operating part 23 is accommodated in the retreat space 28 formed on the side surface side of the gear housing 5 by the protruding part 26 and the protrusion 27, the hammer drill 1 is placed on a flat floor or the like with the operating part 23 side down. Even if it is placed, there is no possibility that the operation unit 23 may come into contact with the floor surface and be damaged.

  Thus, according to the hammer drill 1 of the said form, the protrusion part 26 which becomes higher than the protrusion height from the gear housing 5 side surface of the operation part 23 in the front end of the movement range of the operation part 23 on the side surface of the gear housing 5 is provided. The retracting space 28 is formed on the side surface of the gear housing 5 by the projecting portion 26 so that the operation portion 23 can be placed inside the flat surface S when the projecting portion 26 side is placed on the flat surface S. Thus, it is possible to effectively prevent the operation unit 23 from being damaged during work or storage, and an improvement in durability can be expected.

In addition, a protrusion part is not restricted to a partial thing like the said form, It may replace with a protrusion and a wall-shaped thing, and it does not interfere with a single thing, A plurality can also be formed side by side. Further, it may be at the front position instead of the front end of the movement range of the operation member.
Further, the retreat space may be formed only by the side surface and the protruding portion of the housing without using the protrusion, and conversely, a plurality of protrusions and protrusions are provided above and behind the operation member other than the protruding portion. May be formed.

On the other hand, the projecting portion can be formed so as to be continuously connected from the front to the upper side and further to the rear side so as to surround the movement range of the operation member. In this case, it is also conceivable that the projecting portion is relatively formed around the moving range by making the moving range of the operating member concave on the side surface of the housing.
In addition, it is desirable that at least the tip of these protrusions be formed of an elastic material such as rubber. If it does in this way, the buffering effect at the time of a protrusion part colliding with another thing will be acquired, and protection of protrusion part itself will be achieved in addition to relaxation of the impact to an operator side.

In addition, as long as the operation member is provided on the side surface of the housing, the present invention has a small operation mode, for example, a mode without a neutral mode, and a hammer drill mode (operation) such as the hammer drill 1a shown in FIG. Of course, it is possible to adopt the projecting portion 26a and the retracting space 28a even if only the drill mode (position where the operation portion 23a faces rearward) and the drill mode (position where the portion 23a faces upward) can be switched.
In addition, the internal structure of the hammer drill is specific to the rotation mechanism, striking mechanism, and switching mechanism, such as a striking mechanism that uses a crank mechanism instead of a swash bearing, and that does not have impact bolts and strikes the bit directly with a striker. The structure is not limited to the above form.

It is a partial longitudinal cross-sectional view of a hammer drill. It is AA sectional view. It is a side view of a hammer drill. It is a front view of a hammer drill. It is a partial side view of a hammer drill, (A) shows the mode of drill mode, (B) shows the state of hammer mode, respectively. It is a top view of a hammer drill. It is a side view which shows the example of a change of a hammer drill.

Explanation of symbols

  1 .... hammer drill, 2 .... motor, 4 .... motor housing, 5 .... gear housing, 6 .... rotation mechanism, 7 .... striking mechanism, 8 .... tool holder, 10 .... bit, 11 .... intermediate Shaft, 13 ... second gear, 14 ... clutch cam, 15 ... swash bearing, 17 ... piston cylinder, 18 ... striker, 19 ... impact bolt, 20 ... switching mechanism, 22 ... change lever, 23 .. Operation part, 26 .. Projection part, 27.

Claims (2)

Inside the housing, there are a rotation mechanism for rotating a bit attached to the tip of the housing, a striking mechanism for striking the bit, and a switching mechanism capable of switching operation transmission from the rotation mechanism and striking mechanism to the bit. A hammer drill provided on the side of the housing with an operating member for operating the switching mechanism from the outside of the housing;
Protruding portions that are higher than the protruding height of the operating member from the side surface of the housing are provided at least at the front end or the front position of the movement range of the operating member on the side surface of the housing, and the protruding portion provides the side surface of the housing with the protruding portion. A hammer drill characterized in that a retreat space for accommodating the operation member inside the flat surface when the protruding portion side is placed on the flat surface is formed.   The hammer drill according to claim 1, wherein at least a tip portion of the projecting portion is formed of an elastic material.

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