JPH0459083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a vibratory drill that rotates a bit and vibrates in the axial direction at the same time.

[Background Art] In this vibratory drill, which generates axial vibration by using sliding engagement on the opposing contact surfaces of a pair of opposing cams, the operation of the spindle to which the bit is attached is controlled by rotation and axial vibration. An example of a device capable of switching between two operation modes, one in which the rotation is performed and the other in which only rotation is performed, is disclosed in Japanese Utility Model Publication No. 15924/1983. This is done by fixing one of the pair of cams to the spindle and the other cam to the housing, and by allowing the spindle to move in the axial direction, the contact state between both cams is obtained, and the spindle By making the bit rotate and axially vibrate, and by preventing the spindle from moving back when the bit is pressed against the surface to be drilled, that is, by preventing the spindle from moving in the axial direction. The cam is always in a non-contact state so that the spindle only rotates. However, with such a structure, the stroke of the axial movement of the spindle must be set at a position where both cams are out of contact, and the stroke must be long. Since it is fixed to the housing, there is a problem in that large vibrations are transmitted to the hand holding the housing.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to obtain operation in only rotation mode and both rotation and vibration modes according to a switching operation, and to To provide a vibratory drill which has a short overall length in the axial direction and whose vibrations are transmitted to the hand holding the housing.

[Disclosure of the Invention] The present invention has a spindle that is freely movable in the axial direction and rotationally driven by the deceleration output of a motor, and a mechanism for generating axial vibration that is constructed of a sliding meshing mechanism consisting of a pair of cams. A vibratory drill comprising means for causing the spindle to vibrate in the axial direction by the generating means, in which a first cam movable in the axial direction is biased toward a second cam fixed to the spindle. A freely movable switching device comprising an elastic member and a switching plate that moves the first cam against the bias of the elastic member in response to an operation of a switching operation member and separates the first cam from the second cam. The switching operation member is provided with a vibration-proof elastic body that is in contact with the plate and suppresses the switching plate from vibrating and moving due to vibrations generated during axial vibration by the axial movement generating means, and the switching operation member faces the switching plate. The switching plate is moved by pressing the switching plate with the convex surface, and the length dimension of the switching plate is set to be shorter than the distance between the concave surface of the switching operation member and the first cam. The cam that contacts the cam fixed to the spindle is supported by the housing via an elastic member, and the operation mode is switched by moving the cam in the axial direction. In addition, the switching plate that separates both cams by moving the axially movable cam in accordance with the operation of the switching operation member is able to resist vibrations generated during axial vibration by the axial vibration generating means. This prevents them from vibrating and moving together.

The present invention will be described below in detail based on the illustrated embodiment. A housing 1 is formed by dividing into left and right halves, and a chuck 8 to which a drill bit 9 is attached is located at the front end of the housing 1. The grip 16 is extended, and this grip 16
A battery pack 17 is attached to the lower end of the battery pack 17. 1
1 is a switch handle, 12 is a rotation direction switching handle, 13 is a switch block, and 14 is a dustproof rubber.

Furthermore, in consideration of gripping the housing 1 with its tip as an auxiliary grip, the outer circumferential surface of the tip is provided with unevenness to prevent slipping. A protruding portion 18 is provided in a protruding manner. As shown in FIG. 13, this protrusion 18 prevents the hand holding the tip of the housing 1 from accidentally turning the switch handle 11 or the rotation direction switching handle 12.
In addition to preventing the drill bit from moving, it also serves as a handhold for grasping the tip of the housing 1 when pulling out the drill bit 9 after drilling. To prevent falling dust from reaching the switch part when drilling in this condition.

A pinion 21 is attached to an output shaft 20 of the motor 2, which is housed in the rear part of the housing 1 with its axial direction being the front-rear direction. This pinion 21 functions as a sun gear of the first-stage planetary part in a two-stage planetary mechanism that is a speed reduction device, and a plurality of planetary gears 43 are arranged around it, and the gear case 6 and The planetary gear 43 that meshes with the internal gear 42 and pinion 21 that are integrally formed is a planetary carrier 4 in which a sun gear 46 of the second stage planetary portion is integrally provided.
Supported by 4. A planetary carrier 48 that supports a plurality of planetary gears 47 that mesh with the sun gear 46 and the internal gear 42 has a spline groove on its inner circumferential surface and a spindle 5 that has the chuck 8 at its front end. It is spline connected to the rear end of.

The vibration generating means is for applying axial vibration to the spindle 5 which is rotatably and axially movably supported with respect to the gear case 6.
This is a cam 62 press-fitted into the spindle 5.
and a cam 61 which is loosely fitted onto the spindle 5 and is freely rotatable and axially movable relative to the spindle 5. These cams 61,
The cam 62 has a mesh formed on its opposing surface with an inclined surface that generates a sliding mesh, and the cam 61 is connected to its back surface and the gear case 6.
The spring 63 installed between the cam 62
The gear case 6 is biased in the direction of engagement with the gear case 6, and a protrusion 65 protruding from the periphery is engaged with an axially long groove 69 formed on the inner surface of the gear case 6 to prevent rotation. is being used. In the figure, 50 is a bearing that supports the spindle 5 rotatably and movably in the axial direction, 51 is a bearing that supports the carrier 48, 52 is a thrust plate, 53 is a dustproof rubber, and 54 is a pin for fixing the bearing 50. be.

A switching handle 7 is provided at the tip of the housing 1. The switching handle 7, which is provided with an engaging rib 77 that engages with the inner circumferential surface of the tip end of the housing 1 and is arranged so as to be able to freely rotate around an axis, has one surface as a cam surface. A switching ring 72 is fixed thereto. This switching ring 72 is in contact with the front end of a switching plate 71 that is slidable along the groove 69 in the gear case 6 . Note that this switching plate 71 is provided with a projection 75 that engages with the bearing 50 to prevent it from falling off from the gear case 6.

As shown in FIG. 6, when the switching plate 71 is positioned forward, the output of the motor 2 is decelerated by the planetary mechanism to rotate the spindle 5. Furthermore, if the pair of cams 61 and 62 that move the spindle 5 backward are brought into contact with each other by the reaction force of pressing the drill bit 9 against the surface to be drilled, the cam 62 rotates together with the spindle 5, whereas the cam 62 rotates together with the spindle 5. 61 is prevented from rotating due to engagement with the gear case 6, so when the respective inclined surfaces of the opposing surfaces of the cam 61 and the cam 62 are engaged, they are in the state shown in FIG. As shown in Fig. 7, the cam 62 rotates
Immediately after climbing over the slope of No. 1, the cam 61
gives a blow to the cam 62 due to the bias from the spring 63. As a result, drill bit 9 has spindle 5.
Axial vibrations are also transmitted via.

However, by rotating the switching handle 7, the switching ring 7 can be opened as shown by the chain line in FIG.
2, the switching plate 71 whose rear end is in contact with the projection 65 of the cam 61 pushes the cam 61 backward against the spring 63, and As shown in the figure, it moves to a position where it does not come into contact with the cam 62. Since the rearward movement range of the spindle 5 is restricted by the bearing 50, at this time, even if the drill bit 9 is pressed against the surface to be drilled, the cams 61 and 62 do not come into contact with each other, and therefore the spindle 5 and drill bit 9
Only rotation is transmitted to .

By the way, when axial vibration is also applied to the spindle 5, the length of the switching plate 71 is made shorter than the distance between the cam 61 and the switching ring 72 at this time, so that the cam 61 is not limited to the cam 62. This is to prevent the switching plate 71 from being hit, but the switching plate 71 is arranged so as to be movable in the front and rear direction between the switching ring 72 and the cam 61. It is disposed so as to be freely movable in the axial direction within the gear case 6. Therefore, when vibration is generated by the vibration generating means, the switching plate 71 receives the axial vibration and moves in the axial direction due to the vibration. There is a risk that the bearing 50, the switching ring 72, or the cam 61 will collide with each other, causing abnormal noise. For this purpose, a vibration-proof elastic body 76 made of rubber is attached to the inner surface of the gear case 6 of the switching plate 71 by utilizing the recessed part created when the protrusion 75 is formed on the switching plate 71. This vibration-proof elastic body 76 that contacts the inner surface of the gear case 6 prevents the switching plate 71 from unnecessarily vibrating, rattling, or moving due to vibration, and prevents the switching plate 71 from shaking or moving due to long-term vibration. The plate 71 is designed to avoid adverse effects such as rattling and variable wear due to vibration, and the switching plate 71 can be operated satisfactorily over a long period of time.

Other embodiments are shown in FIGS. 9 and 10. The basic configuration is the same as the above embodiment, but the switching plate 71
A vibration-proof elastic body 76 for suppressing vibration is a rubber ring-shaped member disposed between the switching handle 7 and the front end surface of the gear case 6, and a vibration-proof elastic body 76 is provided on the inner surface of the front end of the switching plate 71. A vibrating elastic body 76 is brought into contact.
In this case, unlike the above embodiment in which the vibration-proof elastic body 76 was required for each switching plate 71, only one vibration-proof elastic body 76 is required, and since it is not incorporated into the gear case 6, installation is easy. It's summery.

The vibration-proof elastic body 76 is not limited to rubber, but may be formed as a compression spring disposed between the cam 61 and the protrusion 75 of the switching plate 71, as shown in FIGS. 11 and 12. Good too. However, if the vibration-proof elastic body 76, which is a compression spring, is too strong, it will reduce the vibration caused by both cams 61 and 62. Make it strong enough.

As mentioned above, when attaching the switching handle 7 to the housing 1 in a rotatable manner, the engaging rib 7
7 is engaged with the housing 1, the chuck 8 side surface of the switching handle 7 can be treated as a flat surface, and the dust-proof rubber 53 can be attached to the inner circumference of the switching handle 7. Since this is done in a recess formed in the surface, dust during upward drilling will not enter into the interior from the tip of the housing 1.

15 and 16 show a storage structure for a chuck handle 90 for attaching and detaching a drill bit 9 to and from the chuck 8. FIGS. That is, by protruding the mounting hook 19 on the upper surface of the housing 1 and engaging the shaft portion of the chuck handle 90 with the mounting hook 19, the shaft portion of the chuck handle 90 is orthogonal to the front-rear direction of the housing 1. It is stored facing the direction. When removing the 16th
As shown in the figure, the chuck handle 90 can be pulled up by placing a finger on the tip of the shaft of the chuck handle 90 that protrudes from the surface of the housing 1. The chuck handle 90 can be removed using the lever principle using the other end of the shaft as a fulcrum, which is easier to remove than by pinching and pulling out, and prevents the chuck handle 90 from accidentally falling off. Even if the holding strength of the chuck handle 90 by the mounting hook 19 is increased in order to prevent this, the chuck handle 90 can be removed without difficulty.

As shown in FIGS. 17 and 18, a mounting hook 19 may be formed on the side surface of the housing 1,
Furthermore, if the handle 91 of the chuck handle 90 is made to be able to slide with respect to the shaft,
The mounting hook 19 is provided near the rear end of the housing 1, and the handle 91 is normally kept so that it does not protrude from the rear end surface of the housing 1. When removing the handle 91, as shown by the chain line in FIG. The protruding handle 91 is slid to protrude to the rear of the housing 1, and as shown in FIG.
The chuck handle 90 may be pulled up by grasping the chuck handle 90.

[Effects of the Invention] As described above, in the present invention, the length of the switching plate for switching the operation mode is set to be shorter than the distance between the concave surface of the switching operation member and the first cam. , the first cam does not hit the switching plate when vibration occurs, and the vibration is not transmitted to the switching plate. There is no rattling in the mounting part, and there is no abnormal noise caused by vibration of the switching plate or damage caused by repeated collisions with other parts due to vibration. It is something. Also,
Even if the main body vibrates when vibration occurs, a vibration-proof elastic body is provided between the gear case and the switching plate, which constitute a part of the main body, and this vibration-proof elastic body prevents the vibration of the main body from reaching the switching plate. It is possible to prevent the switching plate from shaking due to vibration, and the switching plate as a switching member is not affected by vibrations generated by the vibration generating means. This makes it possible to ensure the installation of the switching plate over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIGS. 2 and 3 are exploded perspective views of the same, FIG. 4 is a perspective view of the switching ring and switching plate, and FIG. 5 is a perspective view of the switching ring. 6 to 8 are cross-sectional views showing the same operation as above; FIGS. 9 and 10 are cross-sectional views showing other examples of the vibration-proof elastic body; and FIGS. 11 and 12 are cross-sectional views showing the vibration-proof elastic body 13 is a side view of the same housing as described above; FIG. 14 is a side view showing an upward drilling operation; FIG. 15 is a cutaway plan view;
FIG. 16 is a front view, FIG. 17 is a side view of another housing, and FIG. 18 is a rear view of the same, in which 1 is a housing, 2 is a motor, 5 is a spindle, 7 is a switching handle, and 9 is a drill bit. , 61 and 62 are cams, 63 is a spring as an elastic member, 71 is a switching plate, 72 is a switching ring, and 76 is a vibration-proof elastic body.

Claims (1)

[Scope of Claims] 1. A spindle that is freely movable in the axial direction and rotationally driven by the deceleration output of a motor, and an axial vibration generating means that is constructed of a sliding engagement mechanism consisting of a pair of cams. A vibration drill in which the spindle is caused to vibrate in the axial direction by the generating means, comprising: an elastic member that urges a first cam that is movable in the axial direction toward a second cam that is fixed to the spindle; It has a switching plate that moves the first cam against the bias of an elastic member in response to the operation of the switching operation member and separates it from the second cam. The switching operation member includes a vibration-proof elastic body that suppresses the switching plate from vibrating and moving due to vibrations generated during axial vibration by the directional vibration generating means, and the switching operation member has an uneven surface on a surface facing the switching plate. The switching plate is moved by pressing the switching plate with a convex surface,
A vibration drill characterized in that the length of the switching plate is set to be shorter than the distance between the concave surface of the switching operation member and the first cam. 2. The vibration drill according to claim 1, wherein the vibration-proof elastic body is interposed between the switching plate and the inner surface of the gear case and is in contact with both. 3. The vibration drill according to claim 1, wherein the vibration isolating elastic body is ring-shaped and comes into contact with a plurality of switching plates arranged around the spindle. 4. The vibration drill according to claim 1, wherein the vibration-proof elastic body is a compression spring provided between the first cam and the switching plate.