JPH0111370Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the configuration of a vibrating drill that can be used in reverse.

(Prior art) Generally, a vibrating drill is equipped with a ratchet gear that vibrates in the axial direction on the shaft that holds the bit, and acts when the bit is pressed against the part to be drilled, thereby suppressing the axial vibration. configured to occur.

Such a ratchet gear is configured such that saw-blade-shaped ratchet gears are placed facing each other and the ridges of both gears slide to generate vibration in the axial direction.

The shape of the ratchet gear's peaks has been studied so that the generated vibrations can efficiently affect the bit.

In other words, at a convenient rotation speed, the slope of the mountain is formed to be relatively small in the area where the bit is pressed, so that the slight axial movement that acts on the bit in the axial direction becomes efficient, and the action that does not press the bit is created. The slope becomes steep from the part past the mountain, so you can press hard when pressing the bit.
Research has been conducted to ensure that the return time is shortened and the vibration per revolution is made more efficient.

With this configuration, the number of vibrations generated per rotation is increased, and vibrations that efficiently act on the bit can be obtained.

However, since the rotation direction of bits is generally determined, there is no problem in configuring ratchet gears with different shapes depending on the rotation direction as a way to improve the ratchet gear by improving efficiency. It is true that there are restrictions that prevent it from being used.

Even with a vibrating drill, there are times when it is necessary to reverse the rotation. For example, when using it for installing and removing screws as a method other than drilling with a bit, it may be fine when tightening a screw, but when unscrewing it, The ratchet gear collides with the ridges and stops sliding, resulting in a state in which rotation is restricted.

Today, efforts are being made to improve work efficiency by making portable tools smaller and lighter, but there is also a desire for a single tool to be able to handle a variety of tasks. .

(Problems to be solved by the invention) The present invention was developed in view of the above circumstances, and is easy to use in reverse, can be manufactured at low cost without compromising portability, and is The purpose is to provide a vibration drill that can be expected to operate reliably.

(Means for Solving the Problems) The present invention is designed to provide reliable operation at low cost and to be configured so that reversal can be easily performed, thereby making it convenient to use. The vibration drill is fixed via a one-way clutch that can be rotated and slipped, thereby constructing a vibrating drill that automatically switches without any complicated configuration such as a switching device.

In particular, the clutch at the time of reversal is configured without changing the shape of the ridges of the ratchet gear so that drilling can be performed with high efficiency without impairing the well-researched structure of the conventional ratchet gear.

(Function) Therefore, when the bit is reversed, the operation of the ratchet is automatically stopped, vibration of the bit is eliminated, and only the reversal of the bit can be performed.

In addition, since the vibration stop operation is not required for reversing, operation is extremely easy, and when you want to reverse the bit to escape from the drilled hole immediately after drilling, all you need to do is turn the reversing switch. Just operate it.

(Example) The present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a vertical cross-sectional view of a main part of a vibration drill according to an embodiment of the invention, and Fig. 2 is a longitudinal sectional view of the main part of a vibration drill according to an embodiment of the invention. FIG. 3 is an enlarged vertical sectional view of the main part, and FIG. 3 is a side view of the ratchet gear.

In FIG. 1, the vibratory drill is provided with a bit holding shaft 1 that holds a bit (not shown) at its tip so as to be movable in the axial direction, and is connected to an output shaft 8 of an electric motor via a speed reducer 2.

One ratchet gear 3 is fixed to the bit holding shaft 1 via a one-way clutch 4, and the other ratchet gear 5 is fixed to the case 6 side.

Furthermore, the bit holding shaft 1 is equipped with a switching device 7 for canceling vibrations at the opposite end that holds the bit.
is provided and is configured to move the axial position of the bit holding shaft 1 so that the ratchet gears 3 and 5 do not act.

In FIG. 2, the ratchet gears 3 and 5 are formed with ridges 3a and 5b, which constitute the ratchet gears 3 and 5, respectively, and when the ridges 3a and 5a slide, the direction in which the ridges 3a and 5a protrude is Since a force to move in the axial direction is generated by sliding, the bit moves as shown by the dotted line in the figure and the peak 3 shown in practice, and the bit holding shaft 1 is moved, that is, vibrated. I can do it.

In FIG. 3, the ratchet gears 3 and 5 are
The ridges 3a and 5a are configured to slide away from each other with a small inclination when sliding in the direction of rotation shown by arrows 10, respectively, and the ridges 3a and 5a
After passing the peak of the sliding between the mountain and the mountain 5a, there is a large slope.
In other words, it is configured to drop sharply into a valley.

In such a configuration, the ratchet gear 3,
5, when the bit holding shaft 1 is pushed by the bit and slides, vibration is generated in the axial direction, allowing the bit to drill into concrete or stone.

That is, one ratchet gear 3 rotates together with the bit holding shaft 1, and the other ratchet gear 5, which is fixed to the case 6, slides between the ridges 3a and 5a, and moves in the direction in which the ridges 3a and 5a protrude. vibration is generated.

Then, the rotation of the output shaft 8 of the electric motor is transmitted at a reduced speed to the bit holding shaft 1 via the speed reducer 2, thereby rotating the bit.

Therefore, the bit can be used to drill holes in concrete or stone.

Furthermore, in order to escape the bit from the drilled hole etc., when the electric motor outputs the output and reverses the shaft 8, the bit holding shaft 1 rotates in the reverse direction, and the position direction clutch 4 provided between it and the shaft of the ratchet gear 3 rotates in the opposite direction.
operates and the ratchet gear 3 stops rotating.

Therefore, no vibration occurs, the bit holding shaft 1 only rotates, and the bit can be easily removed from the drilled hole.

Furthermore, since the generation of vibration can be automatically stopped by reversing, the only switching operation is reversing, which is extremely convenient for the operator.

Such a reversal of the bit holding shaft 1 can be easily carried out by applying the conventional technology as it is.
If it is difficult to reverse the electric motor, a reversing gear may be interposed in the reduction gear 2 section.

(Effects of the invention) According to the invention, by performing a reversal when it is desired to escape the bit from a drilled hole, vibration can be stopped without any operation, and the structure of the ratchet gear can be adjusted to the best possible position during vibration. Since it can be configured to improve efficiency, it is extremely effective in vibrating drills that can be used for various purposes.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a vibration drill according to an embodiment of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of the main part, and FIG. 3 is a side view of a ratchet gear. DESCRIPTION OF SYMBOLS 1... Bit holding shaft, 3... One ratchet gear, 4... One-way clutch, 5... Other ratchet gear, 8... Output shaft of electric motor.

Claims (1)

[Scope of utility model registration request] A vibratory drill in which a bit holding shaft is vibrated in the axial direction by a ratchet gear, characterized in that one side of the ratchet gear is fixed via a one-way clutch.