JPH032633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rock drill for drilling a hole in an object using a chisel that is struck by a hammer.

The above-mentioned rock drill is used, for example, to make holes in asphalt when repairing roads paved with asphalt, or to make holes in the walls of buildings in order to repair them. . In these cases, you can press the sharp tip of the chisel against the asphalt, etc., then repeatedly hit the rear end of the chisel with a hammer to gradually drive the chisel into the asphalt, etc. A hole can be drilled. In the above drilling operation, the hammer reciprocates in the axial direction of the chisel in order to strike the chisel, but normally a special drive device is required to reciprocate the hammer in this way. Therefore, in conventional rock drilling machines, the size of the machine itself had to be increased to accommodate the use of the drive device.

In view of the above points, the present invention aims to provide a rock drill whose entire machine can be made compact.

The purpose of this is to provide a rock drill of the type described at the beginning with a frame body that has a chisel at the tip and forms a cylindrical space above the chisel, and a frame body that is placed in the space and can be moved toward and away from the chisel. A hammer body that has a large diameter part that comes into close contact with the frame body at the tip on the side that moves and is close to the chisel, and is hollow inside, an inner wall part that protrudes from the inner circumferential surface of the frame body, and a large diameter of the hammer body. a push-in chamber formed by the push-in chamber; an intake hole for feeding compressed air into the push-in chamber; a groove formed at the tip of the large diameter section of the hammer body; and a valve body disposed in the hollow part of the hammer body. When the hammer body comes into contact with the chisel, the valve body causes the air in the pushing chamber to flow into the tip of the hammer body through the groove at the tip of the hammer body, and the hammer body moves to the upper part of the space. Sometimes this is achieved by the valve body blocking the flow of air from the push chamber towards the groove.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail based on drawings showing embodiments thereof.

FIG. 1 is a sectional side view showing a rock drill according to an embodiment of the present invention, particularly a type that is held by an operator's arm. In the figure, the frame body, which is designated as a whole by reference numeral 1, has a hammer storage portion 2 and an anvil storage portion 3 screwed to the tip of the hammer storage portion 2. A handle 5 including a lever 4 is attached to the rear end of the hammer housing 2. The lever 4 is rotatable around a support shaft 6 provided on the handle 5, and has an intake valve 7 at one end 4a.
A rod 9 that pushes from the valve body 8 is pivotally mounted.
The intake valve 7 is fixed on the outer periphery of the hammer storage portion 2 of the frame body 1, and the intake valve 7 is fixed to the outer periphery of the hammer storage portion 2 of the frame body 1, and receives fluid flowing in from the direction of arrow A.
For example, air may be guided to or blocked from the air intake port 11 of the hammer housing 2.

A hammer device 12 is located inside the hammer storage section 2.
is fitted so as to be movable in the axial direction (arrow B in the figure). This hammer device 12 includes a hammer body 13
and a spool 14 fitted into the hammer body 13. The spool 14 is movable in the axial direction (direction B) relative to the hammer body 13, but is normally pressed toward the right in the figure by the action of the compression spring 15. Also, spool 14
has two channels 16 and 17 within itself. The spool 14 functions to control the movement of the hammer device 12 to the left or right in the figure, and will be described in detail later. The hammer body 13 strikes the head (left end in the figure) of an anvil 19 having a chisel 18 fixed thereto when the entire hammer device 12 moves to the right in the figure.

The anvil 19 is supported by a small-diameter tip portion 2a of the hammer storage portion 2 and a small-diameter tip portion 3a of the anvil storage portion 3. A protrusion 19a is formed on the outer periphery of the anvil 19.
is arranged in a space formed by the tip end 2a of the hammer storage section 2 and the anvil storage section 3. With this configuration, the anvil 19 is supported by the small diameter portions 2a and 3a and is movable in its own axial direction (direction B), but the range of movement is such that the projection 19a has a small diameter. It is limited by hitting part 2a or 3a. Incidentally, reference numeral 21 is rubber for cushioning. Reference numeral 22a is a cushioning material embedded in the head of the anvil 19, and when the hammer device 12 moves rightward, the right end of the spool 14 hits this cushioning material 22a. On the other hand, reference numeral 23a is a cushioning material fixed to the handle 5 disposed at the rear end of the hammer housing 2, and the left end of the spool 14 moving leftward hits this cushioning material 23.

The rock drill according to this embodiment has the above-mentioned configuration, and operates as follows.

First, by grasping the handle 5 and rotating the lever 4 in the direction of arrow C, the valve body 8 moves to the left, thereby sending compressed air into the intake hole 11. During normal drilling work, the tip 18 of the chisel 18
A is pressed against an object such as a road, but let us now consider a case where the entire rock drilling machine is held in the air. In this case, as shown in FIG. The above-mentioned space formed by the body 13 is called a push-in chamber). The hammer body 13 is pushed rightward by the compressed air flowing into the pushing chamber 22, and is held in a state in which it is in contact with the small diameter portion 2a at the tip of the hammer storage portion. In this state, no force is applied to the anvil 19 and therefore the chisel 18. That is, the rock drill is in a stationary state. When operating the rock drill, place the chisel tip 18 at the location where the hole is to be drilled.
Press a (Figure 1). Then, anvil 1
9 moves to the left with respect to the frame 1, and in response, the spool 14 also moves to the left against the spring force of the compression spring 15. By moving the spool 14 to the left, the air hole 2 provided in the hammer body 13 is
3 and the first air hole 24 of the spool 14 gradually approach each other.

When the hammer body air hole 23 communicates with the first air hole 24 of the spool, as shown in FIG. It flows into the flow path 16. The compressed air in the front flow path 16 is passed through the opening at the tip of the spool 14 to the hammer body 13 in advance.
The hammer body 13 passes through the groove 25 provided at the front end of the hammer body 13.
and the anvil 19, and between the hammer body 13 and the hammer housing small diameter portion 2a, that is, to the right side of the hammer body 13.

The compressed air sent to the right side of the hammer body 13 moves the hammer body 13 and the spool 14 to the left as one. Therefore, as shown in FIG. 4, the volume of the pushing chamber 22 becomes smaller, and the volume of the space 26 between the hammer device 12 and the anvil 19 (hereinafter referred to as the lifting room) becomes larger. Become. If the hammer device 12 continues to move to the left, the hammer body air hole 23 will eventually move to the left, and as a result, as shown in FIG. 5, it will not communicate with the pushing chamber 22.

In this state, compressed air no longer flows into the lifting chamber 26, but the hammer device 1
2 continues to move further to the left due to inertia. In this way, the spool 14 of the hammer device 12 that moves due to inertia stops moving when its left end hits the buffer material 23a, but the hammer body 13 continues to move, and therefore the hammer body 1
3 is shifted to the left with respect to the spool 14. As a result of this deviation, the second air hole 27 and the third air hole 28 of the spool 14 communicate with each other via the recess 29 formed in the hammer body 13. Therefore, the compressed air in the lifting chamber 26 flows through the front flow path 1 as shown by the dashed line.
6, second air hole 27, recess 29, third air hole 2
8. Discharge from the exhaust hole 31 through the rear flow path 17. While the compressed air in the lifting chamber 26 is thus exhausted, the compressed air continues to be supplied into the pushing chamber 22, so the hammer device 12 begins to move to the right.

When the hammer device 12 starts to move rightward, the spool 14 is pressed rightward against the hammer body 13 by the compression spring 15, as shown in FIG. It is maintained in communication with the third air hole 28. Therefore, the air displaced from the lifting chamber 26 by the rightward movement of the hammer device 12 is exhausted from the exhaust hole 31 along the aforementioned path.

The hammer body 13 of the hammer device 12 moving to the right strikes the head of the anvil 19, whereby the chisel 18 fixed to the tip of the anvil 19 is pushed into the target road, making a hole. From then on, the hammer device 12 repeats the above-described operation, thereby continuing the drilling operation.

In the drilling work using the rock drill described in detail above, the anvil 19 that holds the chisel 18 and is struck by the hammer body 13 is able to move freely in its axial direction by the frame body 1. Since it is held in place, the vibrations that occur during the drilling operation are extremely small, and the operator can therefore perform the operation with ease.

Further, the hammer body 13 performs a striking action by the movement of a spool 14 that serves as a valve mechanism contained within the hammer body 13, and does not require any special drive device other than this. There is no need to worry about it becoming large.

It is clear from the explanation of the stationary state of the rock drilling machine shown in FIG. 2 that when the chisel 18 is not pressed against the object, even if compressed air is supplied to the intake hole 11, the rock drilling The rock machine does not operate, and can only be activated by pressing the chisel 18 against the object and moving the anvil 19 to the left in the figure. In other words, there is no practical problem even if compressed air is always supplied to the intake hole 11 without providing the intake valve 7.

Further, the diameter D (see FIG. 2) of the surface of the anvil 19 that is struck by the hammer body 13 is preferably as small as possible. This is to reduce the transmission of reaction force from the object to the hammer body 13 when the chisel 18 is driven into the object.

As described above, according to the present invention, the hammer body 13
A spool 14 as a valve mechanism is arranged inside the
This movement of the spool 14 causes the hammer body 13 to
Since the rock drill is designed to perform a striking operation, no special drive device is required other than this, and the entire rock drilling machine can be made compact.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a rock drilling machine showing an embodiment of the present invention, Fig. 2 is a sectional view showing the inside of the frame 1 in a stopped state, and Fig. 3 is a sectional view of the frame in a state in which drilling has started. Cross-sectional views showing the inside of 1, Figures 4 to 6
The figure is a sectional view showing the movement process of the hammer device 12 performing a striking operation. 13...Hammer body, 18...Chisel, 14...Spool (valve body), 2...Hammer storage part (frame body), 22
...Pushing chamber, 11...Intake hole, 25...Groove.

Claims (1)

[Scope of Claims] 1. A chisel that punches a hole in an object; an anvil connected to the chisel; and a chisel that applies a shock to the chisel by hitting the anvil, forming a hollow interior; a hammer body having a groove at its tip; a frame body having a hollow hammer housing and an anvil housing; a pushing chamber formed by the hammer housing of the frame and the hammer body; and an inside of the pushing chamber. an intake hole for feeding compressed air into the hammer body; the hammer body is slidably inserted into the hollow portion of the hammer body; When the body abuts the chisel via the anvil, the air in the pushing chamber is forced into the tip side of the hammer body through the groove at the tip of the hammer body through the opening, and the hammer body is brought into contact with the frame. A rock drill comprising: a spool that blocks the flow of air from the pushing chamber toward the groove when the spool moves to the opposite end of the chisel inside the body.