JPS58155111A - Drilling machine - Google Patents

Abstract

PURPOSE:To make a drilling machine body light and compact by a method wherein a cutter is set to the front end of a revolving shaft body and fed finely without using any gear. CONSTITUTION:Both a shaft body 6 and a cylinder body 4 that are engaged by screwing with each other are inserted into a case 2. Then, after a slide bearing 17 is fitted to the larger diameter portion 18 of the cylinder body 4, a cover portion 7 is screwed into the upper part of the case 2 and fixed by a nut 21 giving suitable controlling force. The instant the cutter tip comes into contact with a body to be drilled and a load occurs on the cutter, the cylinder body 4 begins to revolve against the controlling force and to make automatic fine feeding. Accordingly, this mechanism requires no gear at all.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drilling machine that has a cutter attached to the tip of a rotating shaft-like object and forms a hole in an iron plate or the like while finely feeding the cutter.

When it is necessary to form a hole in an iron plate or the like, an electric drill or a hydraulic punch is used, but depending on the location, it is often impossible to use these machines. For example, at the assembly site of steel frame buildings and steel towers,
If you discover a discrepancy in the position of holes to be drilled in steel, you won't be able to move a large electric drill to the spot, and it will be a difficult task to correct the position of the holes with a file. For this reason, this type of manual drilling machine is highly valued.

In this type of drilling machine, it is an essential mechanism to feed the cutter while rotating it, but conventionally, as a means to prevent this, a combination of many gears was used to reduce the speed. This method was adopted.

However, if such a method is adopted, the number of parts that make up the drilling machine body will increase, which will inevitably lead to the machine body becoming larger and heavier, making it less convenient to use. This has the disadvantage that not only does it become expensive, but it also becomes expensive.

This invention eliminates all gears, etc. that were indispensable in conventional systems, and instead screws a rotatable cylindrical object onto a shaft-like object, and applies a brake to the rotation of the cylindrical object. The aim is to provide a drilling machine with an extremely simple configuration.

The configuration of the drilling machine according to the present invention will be explained based on the drawings. As shown in FIGS. 2 and 4, the drilling machine main body 1 includes a case 2 having a lid part 7, and a rotatable case 2 in the case 2. A cylindrical object 4 that is housed in a state of As shown in FIG. 2, the case 2, which has a general structure of a brake tool 8 for braking rotation, has a cylindrical shape with a large diameter part and a small diameter part, and the small diameter part is , has an inner diameter large enough to insert the shaft-shaped object 6, and its large diameter portion has an inner diameter large enough to accommodate the cylindrical object 4 in a rotatable state. Also, above case 2,
A screw hole 11 is formed at the tip for screwing the bolt 10 that attaches the kotosuri pad 9, and a screw hole 16 is provided near the tip of the case 2 for attaching a clamp 12, etc.
is formed.

The lid part 7 of the case 2 has a hole 14 M in the center for inserting the shaft-like object 6, and a hole 16 near the outer periphery for inserting the bolt 15 for attachment to the case 2. The structure has the following.

As shown in FIGS. 2 and 4, the cylindrical object 4 is composed of a large diameter portion 18 into which the thrust bearing 17 is fitted, and a small diameter portion formed with a screw hole. When stored in the holder, it is configured so that it can rotate freely but cannot move in the axial direction.

As shown in FIG. 3, the shaft-like object 6 has, near its center,
It has a screw thread 5 to be screwed into a screw hole formed in the cylindrical object 4, and one end thereof has a thread 19 for attaching a cutter, and the other end has a screw thread 5 for screwing into the thread hole formed in the cylindrical object 4. , . . . are each provided with a corner portion 20 for attaching the handle.

As shown in FIGS. 2 and 4, the braking device 8 has a structure in which a friction pad 9 is attached to the tip of a bolt 10, and the braking state is maintained by a nut 21 screwed onto the bolt 10. It is configured to obtain.

Each component of the drilling machine according to the present invention is as described above, and its assembly is performed in the state shown in FIG. 4.

That is, the shaft-like object 6 and the cylindrical object 4 are inserted into the case 2 in a screwed state. Next, after fitting the thrust bearing 17 to the large diameter portion 18 of the cylindrical object 4, the lid portion 7 is attached to the case 2, and finally, the braking device 8 is attached to the case 2.
Natsu 2
This is done by fixing it to 1. This results in a drilling machine as shown in ILj.

The drilling machine according to the present invention has the above configuration,
Obtain the following effects.

First, the number of parts can be significantly reduced compared to conventional ones. That is, in the conventional drilling machine, many gears were incorporated for fine feed of the cutter, but in the drilling machine according to the present invention, the shaft-like object 6 is simply
And the cylindrical 'lli! that is screwed onto the shaft-like object! +4 and
There is only a mechanism for applying braking to the joint 4, and no gears or gears are required. As a result, the main body of the drilling machine can be made lighter and more compact.

Furthermore, in order to improve work efficiency, this type of drilling machine requires a fast-forwarding mechanism until the cutter tip touches the object to be drilled, and a fast-returning mechanism after drilling. The drilling machine does not require a separate mechanism. That is, when the cutter is rapidly forwarded or reversed, the load on the cutter is zero, but in this case, the cylindrical object 4 is in a state where it has stopped rotating, so by rotating the shaft-like object 6 once, the load on the cutter is zero. ,l
This allows you to fast forward or rewind in a pinch.

By the way, in conventional models, this fast forward/reverse operation was performed by switching the clutch, but with this configuration, it is possible to accidentally switch the clutch and end up in a fast forward state. If an attempt is made to drill a hole up to this point, the tip of the cutter will become strained, resulting in damage to the tip of the cutter. In this regard, in the drilling machine according to the present invention, the moment the cutter tip comes into contact with the object to be drilled and a load is generated on the cutter, the cylindrical object 4 starts rotating against the braking force, and automatically The state is automatically switched to fine feed mode.

Further, the drilling machine according to the present invention has the advantage that the feed of the cutter automatically changes depending on the hardness of the object to be drilled, thereby allowing efficient drilling. That is, when drilling into a relatively hard material such as a steel plate, the load applied to the cutter increases, and as a result, the cylindrical object 4 and the shaft-like object 6 become more entangled. The cutter feed becomes less. This protects the cutter edge. On the other hand, when drilling into a relatively soft material such as an aluminum plate, the load on the cutter is reduced, and as a result, the rotation of the cylindrical part 4 and the shaft-like object 6 is reduced. Not only that, but the feed of the cutter increases accordingly.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the invention,
Fig. 1 is a perspective view showing the entire drilling machine, Fig. 2 is a perspective view showing each component of the drilling machine, Fig. 3 is a perspective view showing a shaft-shaped object that is a constituent member of the drilling machine, and Fig. 4 is a longitudinal cross-sectional view of the drilling machine. DESCRIPTION OF SYMBOLS 1...Drilling machine body, 2-...Case, 6...Screw hole, 4...Cylindrical object, 5...Screw thread, 6...Shaft-shaped object

Claims (1)

[Claims] l) A cylindrical object in which a threaded hole (filter) is formed in the case (2) in a drilling machine that has a cutter attached to the tip of a shaft-like object that rotates at 0, and forms a hole while finely feeding the cutter. (4) is placed in a braking rotation state, and a shaft-like object (6) having a thread (5) is inserted into the case (2), and the thread (5) of the shaft-like object and the above-mentioned cylindrical A drilling machine characterized by screwing together a screw hole of an object (4).