JPH0360606B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibratory drill that can be used with high efficiency in both rotations.

(Prior Art) Conventionally, in vibrating drills that use ratchets to generate vibrations in the axial direction, the shape of the ratchet ridges has been researched and improved in order to efficiently apply the generated vibrations to the bit.

The most efficient method is to shape the ratchet peaks into a sawtooth shape, that is, to rise to the peak with a gentle slope in the direction of rotation, and then fall to the valley with a steep slope. It has an odd shape.

Analyzing the vibration generation state of these ratchets formed by saw-toothed ridges, it is found that the ridges of the ratchets act on each other to push the bit along a gentle slope in the direction of rotation, and the ridges of the ratchets act on each other to push the bit along a gentle slope in the direction of rotation, leading to sharp troughs. By falling, it returns to its initial position on a gentle slope in a short period of time.

Therefore, although the vibration generated per rotation acts to press the bit, the slope is gentle, the amplitude can be increased, and the resistance in the rotational direction is reduced.

By using such a highly efficient ratchet, it becomes possible to drill holes in concrete and the like at high speed, making it possible to obtain a vibratory drill that is extremely valuable to workers.

However, in such a highly efficient ratchet, the rotating direction is limited to one direction because the sliding ridges are formed in a sawtooth shape.

Therefore, when drilling, there is no problem because the direction of rotation is limited due to the nature of the bit, but when the bit is to be removed from the drilled hole or used for attaching and removing screws, it is necessary to reverse the rotation. caused a problem.

That is, because of the saw blade shape, it slides along a gentle slope but does not slide in the opposite direction, resulting in problems such as rotation being restricted and damage or burnout of the motor.

For this reason, attempts have been made to stop vibration via a clutch during reversal in order to avoid problems during reversal, but such methods have the problem that vibration does not occur during reversal.

If vibration is not generated during reversal, vibration will be necessary for tasks such as unraveling rusted screws, and this poses a problem in that it cannot be used for such purposes.

Under these circumstances, attempts have been made to construct a ratchet with triangular peaks so that it can slide in either direction of rotation so that vibrations occur in forward and reverse rotations, but this has been effective. Although it can be used for many purposes, it is inefficient and causes problems such as slow drilling.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and is capable of generating vibrations with high efficiency in forward and reverse rotation, and does not impair portability. The purpose of the present invention is to provide a vibratory drill that can be made compact and lightweight.

(Means for Solving the Problems) The present invention provides a vibrating drill that is equipped with a serrated ratchet axially opposed to a shaft that holds a bit, in which the fixed ratchet and the rotary ratchet are latched in different directions. The structure is such that highly efficient vibration can be obtained in both forward and reverse rotations by interposing intermediate ratchets with corresponding ratchets.

(Function) In such a configuration, the stationary ratchet is fixed, and when the rotating ratchet rotates, the intermediate ratchet is interposed, so depending on the direction of rotation, the crest on the slidable side will slide. Vibrations will occur in both rotational directions.

The generated vibration is caused by the fact that the fixed ratchet and rotating ratchet are shaped like saw blades in different directions, so if one ratchet cannot slide in a certain direction of rotation, the other ratchet will move in the opposite direction. The shaped ratchet ridges will slide.

Therefore, it can accommodate any direction of rotation.

In addition, the ratchet has a sawtooth shape in both rotational directions, which generates highly efficient vibrations, making it ideal for drilling with a bit and for attaching and detaching screws while applying vibration. However, it has the effect of achieving similar high efficiency.

(Embodiment) The present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a longitudinal cross-sectional view of a main part of a vibration drill according to an embodiment of the invention, and Fig. FIG. 3 is a side view of the main parts showing the state of the ratchet, and FIG. 3 is a side view of the main parts showing the operating state.

In FIG. 1, the vibratory drill is constructed such that a shaft 1 holding a bit (not shown) is rotated by a shaft 2 of an electric motor via a speed reducer 3.

A fixed ratchet 5 fixed to the case 4 is provided along the axis of the shaft 1, and a rotating ratchet 6 is provided on the shaft 1 so as to face the fixed ratchet 5.

Furthermore, a fixed ratchet 5 and a rotating ratchet 6
An intermediate ratchet 7 rotatably formed between
The fixed latch 5 and the rotary latch 6 are formed such that the slopes of the ridges 5a, 6a are in different directions with respect to the opening direction.

Moreover, the peaks 7a and 7b of the intermediate ratchet 7 are the same as the peaks 5 of the fixed ratchet 5 and the rotating ratchet 6.
A slope corresponding to the slopes of a and 6a is formed.

That is, each of the peaks 5a, 6a, 7a, and 7b is formed with a gentle slope in one direction, then suddenly becomes a valley, and then slopes again to form a sawtooth shape.

The ridges 5a, 6a, 7a, and 7b are configured to push the sliding portion 8 in the axial direction, respectively.

In Fig. 2, the fixed latch 5 is fixed, and when the rotating latch 6 rotates as indicated by the arrow in the figure, the rotating latch 6 and the intermediate latch 7 are shaped so that their respective peaks 6a and 7a abut each other. , they rotate together without sliding.

The ridges 5a of the fixed ratchet 5 and the ridges 7b of the intermediate ratchet 7 have shapes that are gently sloped relative to each other and can slide.

In Fig. 3, when the rotary latch 6 rotates as indicated by the arrow in the figure, the peak 5 of the fixed latch 5
The shape is such that the crest 7a of the rotating ratchet 6 and the ridge 7a of the intermediate ratchet 7 slide against each other.

With such a configuration, the vibration drill rotates the shaft 1 in the state shown in FIG. 2 or the state shown in FIG. 3, and vibrates through the intermediate ratchet 7 without being restrained. Occur.

In addition, the vibrations are generated under the same conditions in any rotation, and the shapes of the ridges 5a, 6a, 7a, and 7b can be set to be most efficient.

That is, in the direction of rotation shown in FIG. 2, the ridges 6a of the rotating ratchet 6 and the ridges 7a of the intermediate ratchet 7 slide to generate vibration, and these ridges 6a and 7a each move in the direction of rotation. It is formed with a gentle slope to generate vibration efficiently.

In the direction of rotation shown in FIG.
Since the ridges a collide with each other and do not slide, the ridges 5a of the fixed ratchet 5 and the ridges 7b of the intermediate ratchet 7 slide, generating vibration.

Therefore, the shaft 1 can generate vibrations under the same conditions in any direction of rotation.

(Effects of the Invention) As explained above, according to the present invention, it is possible to generate highly efficient vibrations under the same conditions no matter which direction the bit is rotated, and without any troublesome switching. This makes the operation of the machine extremely convenient for the operator and expands its use as a vibrating drill.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the main part of a vibrating drill according to an embodiment of the present invention, FIG. 2 is a side view of the main part showing the ratchet state, and FIG.
FIG. 3 is a side view of main parts showing the operating state thereof. 5... Fixed ratchet, 6... Rotating ratchet, 7... Intermediate ratchet, 5a, 6a, 7a,
7b...Mountain.

Claims (1)

[Claims] 1. In a vibrating drill equipped with a ratchet formed of serrated ridges axially opposed to a shaft that holds a bit, the fixed ratchet and the rotating ratchet are made to have ratchets with different inclination directions, and ratchets corresponding to each are made. A vibratory drill characterized by having a formed intermediate ratchet interposed therebetween.