JPH03178708A - Impact adjusting device for handy vibration drilling tool - Google Patents

Abstract

PURPOSE:To enable the impact adjustment of a drilling tool by threading the other spring seat to a casing in an axial direction and providing an operating member for rotationally moving the other spring seat so that a gap between one spring seat and the other spring seat can be varied. CONSTITUTION:When a drill bit is pressed against a work while handling the casing 12 of a handy vibration drilling too, a rotating ratchet 20 and a fixed ratchet 22 which are fixed to an output spindle 16 are engaged together. When the rotating ratchet 20 rotates with the output spindle 16, the crest of the rotating ratchet 20 rides on the crest of the fixed ratchet 22, and then small vibration occurs in the output spindle 16 in an axial direction to make an impact drilled hole. The elastic force of a spring 28 operates toward an arrow mark, and so in order to enhance impact when drilling a concrete or others an operating portion 30 is rotated to narrow a gap between spring seats 24, 26 while in order to lower impact when drilling a thin tile or others the gap between the spring seats 24, 26 is widened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an impact force adjustment device for a portable vibratory drill tool for impact drilling in concrete, tiles, bricks, etc.

[Prior Art] A portable vibratory drill tool consists of an output shaft to which a drill bit is connected by a chuck, etc., and a casing equipped with a motor, etc. for rotating this output shaft. Impact drilling is performed by pressing the drill bit against a workpiece such as concrete, tile, or brick, and rotating and reciprocating the drill bit.

A portable vibratory drill tool (200) for reciprocating this drill bit has a conventional structure as shown in FIG. 3.

That is, a rotary ratchet (220
), and a fixed ratchet (222) is provided inside the casing (212) so as to be non-rotatable and slidable in the axial direction. Inside the casing (212), one spring seat (22B) is provided, and the fixed ratchet (222) is provided with the other spring seat (224), and both spring seats (224)
A spring (228) for preloading the output shaft (21B) in the axial direction is arranged between the output shaft (22B) and the output shaft (22B).

Thereby, when the drill bit is pressed against the workpiece, the fixed ratchet (222) and the rotating ratchet (220)
) and the rotary ratchet (220〉) engages with the output shaft (
21B), reciprocating motion occurs.

[Problems to be Solved by the Invention] With the portable vibratory drill tool described above, since the impact force when the drill bit reciprocates is constant, there is no problem when impact drilling hard concrete, etc.; When perforating tiles, soft bricks, etc., there is a problem in that the workpieces may crack or chip.

[Object of the Invention] The present invention provides a striking force adjustment device for a portable vibrating drill tool that can adjust the striking force of a bit such as a drill bit.

[Means for Solving the Problems] The impact force adjustment device for a portable vibrating drill tool according to claim 1 of the present invention comprises: an output shaft to which a bit such as a drill bit is connected; a rotary ratchet fixed to the output shaft; , a fixed ratchet provided inside the casing that cannot rotate and slides in the axial direction on the die 7E, one spring seat provided inside the casing, and the other spring seat provided on the fixed ratchet;
It is equipped with a spring that is interposed between both spring seats and preloads the output shaft in the axial direction, and by pressing the bit against the workpiece, the fixed ratchet and rotating ratchet are engaged, causing rotation and slight reciprocating motion to the drill bit. The present invention is a portable vibratory drill tool, in which the other spring seat is screwed into the casing in the axial direction, and an operating member for rotating the other spring seat is provided.

The impact force adjustment device for a portable vibratory drill tool according to claim 2,
An output shaft to which a bit such as a drill bit is connected, a rotating ratchet fixed to the output shaft, a fixed ratchet provided inside the casing so as to be non-rotatable and slidable in the axial direction, and a fixed ratchet provided inside the casing to be able to slide in the axial direction. One spring seat is provided on the fixed ratchet, the other spring seat is provided on the fixed ratchet, and a spring is inserted between the two spring seats and preloads the output shaft in the axial direction. , a portable vibratory drill tool that engages a fixed ratchet and a rotating ratchet to give rotation and slight reciprocating motion to a drill bit,
The casing consists of a main body provided with the one spring seat, a tip portion provided with a fixed ratchet and the other spring seat, the other spring seat is fixed to the main body, and the tip portion is axially disposed relative to the main body. It is screwed together.

[Function] In the impact force adjusting device for a portable vibrating drill tool according to claim 1, the other spring seat is rotated by the operating member to slide the spring seat in the axial direction with respect to the casing. As a result, the distance between one spring seat and the other spring seat changes, and the elastic force of the spring that preloads the output shaft changes.

In the impact force adjusting device for a portable vibratory drill tool according to claim 2, the tip of the casing is rotated to slide in the axial direction. As a result, the distance between one spring seat and the other spring seat changes, and the elastic force of the spring that preloads the output shaft changes.

[Example] The portable vibratory drill tool of the first example of the present invention was
The explanation will be based on the longitudinal cross-sectional view of the figure.

(10) is a portable vibrating drill tool of the first embodiment.

(12) is a casing, and the inside of the casing near its tip constitutes a ratchet holder (14).

(16> is an output shaft connected to a rotation drive mechanism such as a motor. A chuck is provided at the tip of this output shaft (16), and a trilby throat (not shown) can be attached thereto.

(18> is a ball bearing that rotatably attaches the output shaft (14) to the casing (12>).

(20) is a rotary ratchet fixed to the output shaft (16), and is housed inside the ratchet holder (14) of the casing (12>) so as to be slidable in the axial direction.

(22) is a fixed ratchet that fits into the rotating ratchet (20). This fixed ratchet (22)
is disposed inside the ratchet holder (14) so as to be slidable in the axial direction but not rotatable. In addition, the rear surface of this fixed ratchet (22) has a spring seat (24).
It becomes.

(26) is a disk-shaped spring seat that pairs with the spring seat (24). At the rear of this spring seat <26> is a male screw (2
6a) is provided in a protruding manner, and this male thread (26a) is screwed in the axial direction of the casing (12). Moreover, a gear is engraved on the outer peripheral surface of the disk-shaped spring seat (26).

(28) is a coiled spring disposed between the spring seats (24) and (2f3). This spring (30) urges both ratchets (20) and (22) forward to apply impact force to the bit.

(30) is a gear-shaped operating portion fitted with the gear of the spring seat (26). This operation part (30) is connected to the casing (1
2) Place the casing (12) so that a portion is exposed at the bottom of the casing (12).
It is arranged so that it can rotate freely. When the operating portion (30) is rotated, the spring seat (26) also rotates together with it.

(32) is a ball for preventing malfunction of the operation section (30), and (34) is a ball for preventing malfunction of the operation section (30).
).

The usage conditions of the portable vibratory drill tool (10) having the above configuration will be explained below.

The operator holds the casing (12) of a portable vibratory drill tool (lO) and presses the drill bit against the workpiece.

When pressed, a rotating ratchet (
20) and the fixed ratchet (22) are fitted together.

When the rotating ratchet (20) rotates together with the output shaft (16), the peaks of the rotating ratchet (20) ride on the peaks of the stationary ratchet (22), causing the output shaft (16) to rotate.
), minute vibrations are generated in the axial direction, and the workpiece is perforated by impact. In this case, the elastic force of the spring (30) acts in the direction of the arrow in Fig. 1, but when perforating concrete etc., the elastic force of the spring (30) is It is necessary to increase it. Therefore, by rotating the operation part (30), the spring seat (24)
(2B) Narrow the interval.

On the other hand, when drilling thin tiles or soft bricks by impact, the operation section (30) widens the spacing between the spring seats (24) (2B) in order to reduce the impact force of the bit.

As described above, the impact force of the portable vibratory drill tool (10) can be easily adjusted depending on the workpiece.

Therefore, thin tiles, soft bricks, etc. will not crack or chip.

The portable vibrating drill tool (110) of the second embodiment is
This will be explained using a diagram. In addition, 100 is added to the reference number for members corresponding to the first embodiment 9.

The ratchet holder (114) of the casing (112) consists of a tip (114a) and a main body (m4b), and the tip (114a) is screwed into the main body (114b) in the axial direction. The spring seat (12B) is fixed to the main body m4b) of the casing (12).

In the groove bottom portable vibratory drill tool (110),
To adjust the impact force of the drill bit, use the tip (l14
When a) is rotated relative to the main body (114b), the spring seat (
124) The spacing between (12B) changes and the spring (130)
The elastic force of changes. Therefore, depending on the workpiece,
The impact force of the portable vibrating drill tool (110) can be easily adjusted. Therefore, thin tiles, soft bricks, etc. will not crack or chip.

[Effects of the Invention] The impact force adjustment device for a portable vibratory drill tool according to claim 1 of the present invention is achieved by rotating the operating section. The elastic force of the spring can be adjusted by changing the spacing between the spring seats. Therefore, the striking force of the bit can be easily and delicately adjusted. Therefore,
Thin tiles and soft bricks will not crack or chip.

The impact force adjustment device for a portable vibrating drill tool according to claim 2 also includes:
By rotating the tip, the striking force can be easily and subtly adjusted.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of the main parts of a portable vibrating drill tool showing a first embodiment of the present invention, and FIG. 2 is an enlarged longitudinal cross-sectional view of main parts of a portable vibrating drill tool showing a second embodiment FIG. 3 is an enlarged vertical sectional view of main parts of a conventional portable vibrating drill tool. [Explanation of symbols 10.110...Portable vibration drill tool 12.
112...Casing 14.114...Ratchet holder 16.11
6... Output shaft 18.118... Ball bearing 20.12
0...Rotating ratchet 22.122...
・Fixed ratchet 24.124... Spring seat 26.126... Spring seat 28.128... Spring 30... ...Operation unit 32
・・・・・・・・・・・・・・・Ball 34...
・・・・・・・・・・・・・・・Hane 114a...
...... Tip portion 114b ......
...Residence permit applicant Shibaura Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. An output shaft to which a bit such as a drill bit is connected, a rotating ratchet fixed to the output shaft, and a fixing member provided inside the casing so as to be non-rotatable and slidable in the axial direction. The bit is equipped with a ratchet, one spring seat provided inside the casing, the other spring seat provided on the fixed ratchet, and a spring that is interposed between both spring seats and preloads the output shaft in the axial direction. In a portable vibrating drill tool that engages a fixed ratchet and a rotating ratchet by pressing against a workpiece and gives rotation and slight reciprocating motion to a drill bit, the other spring seat is screwed into the casing in the axial direction. A striking force adjustment device for a portable vibrating drill tool, characterized in that an operating member for rotating the other spring seat is provided. 2. An output shaft to which a bit such as a drill bit is connected, a rotating ratchet fixed to the output shaft, a fixed ratchet provided inside the casing that cannot rotate but is slidable in the axial direction, and One spring seat provided on the fixed ratchet, the other spring seat provided on the fixed ratchet, and a spring interposed between the two spring seats that preloads the output shaft in the axial direction, and presses the bit against the workpiece. In this portable vibratory drill tool, which engages a fixed ratchet and a rotating ratchet to provide rotation and slight reciprocating motion to the drill bit, the casing connects the main body provided with the one spring seat, the fixed ratchet and the other spring. A striking force adjustment device for a portable vibrating drill tool, characterized in that the tip part is provided with a seat, the other spring seat is fixed to the main body, and the tip part is screwed to the main body in the axial direction.