JPH04105883A - Vibrating drill - Google Patents

Abstract

PURPOSE:To prevent any clutch function from being operated during application in a 'vibrating drill' mode by installing a regulating means, which regulates a selector means so as to be selected to the 'vibrating drill' mode after selecting a clutch to a 'clutch-off' mode, in space between two members driving the selector means and the clutch. CONSTITUTION:With rotation of a selector handle 11, a regulating means 20 also operates, an adjusting screw 17 moves slight to a drive part 6, and thereby a selector plate 12 comes to a state of being moved slight to an attaching means 7. In brief, a clutch 5 is turned to a 'clutch-off' mode while a selector means 4 is turned to a 'vibrating drill' mode. With this 'clutch-off' mode selected, a first spring 14 comes to a coherent state by movements of the adjusting screw 17 to a nearby spot of the drive part 5. In consequence, any movement of a steel ball 1 is restricted, through which any motion in a direction of rotation of a third ring gear 13 is checked by the steel ball 15 situated in a recess on an irregular surface of this gear 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibratory drill that rotates a tip tool and vibrates in the axial direction.

[Prior Art] A conventional vibrating drill includes a spindle, a rotating cam, a slide cam, a switching means, and a clutch. This spindle is supported by a bearing so as to be movable in the axial direction in order to generate vibrations. It is movably connected to a drive unit consisting of a motor, a speed reduction mechanism, etc. This rotating cam has a large number of ring-shaped teeth that are uneven in the axial direction, and is fixed to a spindle. This slide cam has teeth corresponding to the rotating cam, is biased by a spring toward the rotating cam, and is loosely fitted onto the spindle. This switching means can be used in the "vibration drill" mode, which is used to drill holes in concrete or mortar by meshing the slide cam with the rotating cam and rotating the spindle while vibrating in the axial direction, or in the "vibrating drill" mode, which is used to drill holes in concrete or mortar. Release the alignment, rotate the spindle, and switch to "driver" mode, which is used for tightening screws and drilling holes. This clutch allows you to freely select from 5 levels of limit I and torque when tightening screws, etc.
You can select a clutch command mode or a "clutch disengaged" mode in which the maximum torque is reached and the clutch function does not work.

In this device, the switching means and the clutch function independently.

[Problem to be solved by the invention]

When using a vibrating drill like the one mentioned above in the "driver" mode, the "
Select and use the limit torque of Clutch Person mode. In addition, when using in the "vibration drill j mode", the "clutch disengaged" mode is selected and used at maximum capacity. In this way, there is no problem if you can use it properly, but if you forget to switch to the "clutch disengage" mode and change it to the "vibration drill" mode, you may forget to switch the "driver" mode in the "clutch person" mode. If you use the clutch function during drilling, the clutch function will be activated and the drilling operation will be interrupted. The drilling operation will be restarted after recognizing this interruption and switching the clutch to the "clutch disengage" mode. If this happens frequently, it will lead to a decrease in drilling efficiency.

The present invention was made in view of the above circumstances, and its purpose is to set the necessary clutch to the "clutch disengage" mode when using the "vibration drill" mode. We offer vibrating drills that can be used.

[Means to solve the problem]

In order to achieve the above object, the vibration drill of the present invention is supported by a shaft so as to be movable in the axial direction, and one end is provided with attachment means for attaching a tip tool, and the other end is provided with a mounting means for attaching a tip tool to the shaft. A spindle connected to a drive unit so as to be movable in the axial direction, a rotating cam having a large number of uneven teeth in the axial direction and fixed to the spindle, and teeth corresponding to the rotating cam, The slide cam is biased by a spring toward the rotating cam and is fitted loosely into the spindle, and the "vibration drill" mode and slide cam, in which the slide cam is meshed with the rotating cam and rotates while applying vibration in the axial direction to the spindle. A switching means has a member that switches to a "driver" mode that disengages the rotating cam and rotates the spindle, and a "clutch person" mode in which the clutch function works when the spindle is overloaded or the clutch function does not work. "
A vibration drill comprising: a clutch having a member that is driven when the clutch is switched to the "clutch disengage"mode; The configuration includes a regulating means for regulating switching to "drill" mode.

[Effect]

According to this configuration, the switching means cannot be operated unless the clutch is set to the "clutch disengaged" mode, so if it is in the "vibration drill" mode, it can be used in the "clutch disengaged" mode without mishandling. I can do it.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

Reference numeral 1 denotes a spindle, which has six stages of shaft parts, one end of which is connected to the output side of a drive part 6 by engagement of a spline or the like, and the other end of which has attachment means 7 for attaching a tip tool. And, it is supported by bearings 8, 8 in a state where it can move in a predetermined direction in the axial direction. The speed reduction device of this drive unit 6 is made up of a three-stage planetary mechanism, in which a pinion 6b fixed to the output shaft of a motor 6a is connected to the input side, and a carrier 6 to the output side.
The spline shaft portion 1a of the spindle 1 and the like are connected to c.

This attachment means 7 is made of a drill chaff or the like, and is screwed onto a threaded portion 1b provided at the tip of the spindle 1. This movement in the axial direction is caused by the rotating cam 2 (described later) fixed to the shaft of the fourth stage (hereinafter counted from the shaft in which the threaded part 1b is provided) or the end face of the shaft of the second stage to the bearing 8. It is possible to reach the regulated position.

Reference numeral 2 denotes a rotating cam, which is made of a sintered alloy and has a large number of teeth 2a with a serrated cross section that is uneven in the axial direction. It is fixed to the shaft of the eye.

A slide cam 3 is made of a sintered alloy, and has teeth 3a corresponding to the teeth 2a of the rotating cam 2 on one end surface, and a hole 3b that loosely fits into the fourth stage shaft portion of the spindle 1 on the shaft center. It has protruding pieces 3c on three sides of the outer periphery that engage with grooves 9a of the gear case 9 and protrude to the outer periphery, and the teeth 3a are biased by a spring toward the rotating cam 2. This slide cam 3 is gear case 9
The direction of rotation of the spindle 1 is regulated by engagement with a groove 9a provided in the axial direction.

Reference numeral 4 denotes a switching means, which includes a switching handle 11 that engages with the housing 10 and is supported to be rotatable at a predetermined angle around the axis of the spindle 1, and a switching handle 11 that engages with the groove 9a of the gear case 9 and rotates in the axial direction. The switching plate 12 is movably supported. An annular cam portion 11a, which is a member for switching and driving, is provided on the inner surface of the switching handle 11 facing the front end surface of the gear case 9. One end of the switching plate 12 is always pressed against the cam portion 11a by a slide cam 3 biased by a spring. This switching plate 12 and a first spring 14 of the clutch 5, which will be described later, are driven by the rotation of the switching handle 11, and when the first spring 14 is brought into close contact with the switching handle 11, the switching plate 12 is moved to the most attaching means. It comes to a position closer to the 7 side.

5 is a clutch that holds the third ring gear 13 of the planetary gear mechanism in the third stage counting from the motor 6a side with a spring bias;
This first spring 14 is bent in accordance with the rotation angle of the switching handle 11 to adjust the spring force.

This third ring gear 13 has convex portions arranged at equal intervals on one end surface to form a concave and convex surface, and the steel balls 15, 15, 15, 15, 15, 15, 15, 13, 13, 13, 25, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 3, 4, 4, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, and 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 4, 3, and 3. - Receives spring force through. This first spring 14 is held between a thrust plate 16 (described later) and an adjustment screw 17 (described later).

The thrust plate 16 is formed by punching a steel plate into a donut shape, and is fitted into the tip of the gear case 9 so as to hold the steel ball 15 in the gear case 9. This thrust plate 16 has a hole in which a part of the steel ball 15 is fitted], a plurality of holes 6a, 1.6a, and a locking piece 1 that is locked in the groove 11b of the switching handle II.
6'b is provided. This locking piece 16b causes the thrust plate 16 to rotate in accordance with the rotation of the switching handle 11. The adjustment screw 17 has a cylindrical shape and has a flange 17a at one end, a protrusion 17b projecting outward from the flange 17a, and a female threaded portion 17c on the inner surface. This protrusion 17b engages with the groove 11b of the switching handle 11 of the member to be switched and driven, and the female threaded portion 17c fits into the male threaded portion 9b of the tip portion of the gear case 9. The adjustment screw 17 rotates in response to the rotation of the switching handle 11 and moves in the axial direction.

Reference numeral 20 denotes a regulating means, and a member for switching and driving the switching means 4 and the clutch 5 is provided on the switching handle 11, and a cam portion 11a is provided so that each switching operates sequentially.
A groove portion 11b is provided. While the cam part 11a is driving the adjusting screw 17 toward the driving part 6, the switching plate 12 is held close to the driving part 6, and when the first spring 14 is in close contact and the driving of the adjusting screw 17 is stopped, the switching plate 12 is switched. The plate 12 is provided so as to be held close to the attachment means 7. Further, this groove portion 11b is provided so that the adjustment screw 17 is driven toward the attachment means 7 and is restrained in the direction in which the attachment means 7 is positioned at a position that provides the minimum limit torque for the clutch 5 to function. .

Next, the operation of this device will be explained.

FIG. 1 shows that by rotating the switching handle 11, the regulating means 2
0 also operates, the adjustment screw 17 moves closer to the drive unit 6,
The switching plate 12 is in a state of being moved closer to the attachment means 7. That is, the clutch 5 is in the "clutch disengagement" mode and the switching means 4 is in the "vibration drill" mode. By selecting this "clutch disengagement" mode, the first spring 14 is brought into close contact by moving the adjustment screw 17 toward the drive section 6. As a result, the movement of the steel balls 15 is restrained, and the movement of the third ring gear 13 in the rotational direction is restrained by the steel balls 15 located in the concave portions of the uneven surface of the third ring gear 13. Further, the "vibration drill" mode is selected, and the switching plate 12 is moved closer to the attachment means 7. As a result, the rotating cam 2 and the slide cam 3 mesh with each other, and as the rotating cam 2 rotates, the slide cam 3 vibrates in the axial direction. Since this slide cam 3 is biased by a spring, each time it engages with the rotating cam 2, it applies an impact to the spindle according to the elastic force of the second spring 18.
give to

FIG. 2 shows a state in which the adjusting screw 17 has moved toward the attachment means 7 and the switching plate 12 has moved toward the drive section 6 due to the reverse rotation of the switching handle 11 from that shown in FIG. That is,
This is a state in which the clutch 5 is in the "clutch on" mode and the switching means 4 is in the "driver" mode. By selecting this "clutch person" mode, the adjustment screw 17 is moved toward the attachment means 7, and the first spring 14 changes from a close contact state to a state having spring properties. As a result, the third ring gear 1
3 is in a spring biased state, and when an overload is applied to the spindle 1, the uneven surface of the third ring gear 13 and the steel ball 15
The gap will slip and power transmission exceeding the limit torque will not be possible.

Further, the "driver" mode is selected, and the switching plate 12 is driven by the cam portion 11a of the switching handle 11 to move toward the drive section 6. As a result, the slide cam 3 moves to the switching plate 12.
As a result, it moves toward the drive unit 6 against the second spring 18, and is disengaged from the rotating cam 2.

By rotating the switching handle 11, that is, by operating the regulating means 20, the clutch 5 is switched to the "clutch disengaged" mode, and the switching means 4 is switched from the "driver" mode to the "vibration drill" mode. Switch to In addition, the "driver" of the switching means 4
At the same time as switching to the mode, the clutch 5 is switched to the "clutch person" mode.

The housing 10 of this device is equipped with a drill bit 19 having one end pointed. This drill bit I
A recess 1 provided in the housing 10 using a pointed part 9
I am trying to put the name etc. in 0a.

This prevents the surface of the housing 10 from being damaged due to rough handling such as throwing this type of power tool into a tool box, and the name etc. written on the surface disappearing, making it difficult to distinguish it from others. ing.

〔effect〕

The vibration drill of the present invention cannot be used in the "vibration drill" mode unless it is set to the "clutch disengagement" mode, so the clutch function operates and the drilling operation is interrupted while it is being used in the "vibration drill" mode. This has the effect of preventing a decline in work efficiency due to errors.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the "vibration drill" and "clutch disengagement" modes. FIG. 3 is a sectional view showing the state in which the switching plate is driven by the switching handle. FIG. 4 is a view taken along the line A-A in FIG. 2, looking at the thrust plate. 1-Spindle, rotating cam, slide cam, switching means, clutch, drive section, attachment means, regulating means. Patent applicant Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) It is supported by a shaft so that it can move in the axial direction, and has a mounting means for attaching the tip tool at one end, and the other end is connected to the drive part so that it can move in the axial direction. A rotary cam is fixed to the spindle and has a large number of uneven teeth in the axial direction, and has teeth corresponding to the rotary cam. A "vibration drill" mode in which the slide cam to be fitted and the slide cam are engaged with the rotating cam and rotated while applying vibration in the axial direction to the spindle, and the spindle is rotated by releasing the engagement between the slide cam and the rotating cam. A clutch having a switching means that has a member that switches to and drives the "driver" mode, and a member that switches and drives the "clutch on" mode in which the clutch function is activated when the spindle is overloaded, and the "clutch disengaged" mode in which the clutch function does not work. In the vibration drill comprising the above, a clutch is disposed between the switching means and the members that drive the clutch.
1. A vibratory drill characterized by being provided with a regulating means for regulating the switching means to be switched to a "vibration drill" mode after switching to a "clutch disengage" mode.