JPS6363351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grindstone switching mechanism suitable for a hand polisher mainly used for processing stone materials, and an object of the present invention is to enable one-touch switching between grindstones of different grain sizes.

When processing stone with a hand polisher, various steps are required, from roughening to chamfering. Therefore, when chamfering is conventionally performed, there are two methods: one is to hold a grindstone in the palm of the hand and rub the surface of the grindstone against the corner of the stone, and the other is to use a hand polisher. In the case of the former (manual work), human power (arm strength) is used as the power source, making the work difficult and low in efficiency. The latter (hand polisher)
In this case, it is necessary to constantly attach and remove grindstones for each grain size from the tip of the polisher, and to improve workability, it is necessary to have a large number of hand polishers equipped with grindstones for each grain size. There is such waste.

The present invention aims to solve the above-mentioned conventional problems by making it possible to switch the grindstone attached to the polisher head with a single touch, and will be explained below with reference to the drawings.

FIG. 1 is a plan view showing a part of the head portion of a hand polisher to which the present invention is applied, in horizontal cross section.
The output shaft 2 of the motor 1 protrudes forward (in the direction of arrow F) from the main body of the motor 1, and has a large diameter part 2a and a small diameter part 2b concentrically. A hole is rotatably fitted between the stepped portions 4 and 4a, and a lock nut 5 is tightened on the stepped portion 4a. A disk-shaped drive plate 7 is fitted into the small diameter portion 2b through a key 6 so as to be able to slide freely, and the head of a spring receiving bolt 9 screwed into a screw hole 8 at the center of the front end of the output shaft 2 is fitted into the small diameter portion 2b through a key 6. By compressing the compression coil spring 10 between the drive plate 7 and the drive plate 7, the drive plate 7 is always urged backward (in the reverse F direction). A cup-shaped cover 11 for covering the bolts 9 and springs 10 is fixed to the front surface of the boss portion of the drive plate 7 with a plurality of screws 12.

The drive plate 7 has concentric circles A, B, with radii Ra, Rb, Rc,
Three pin holes 14a, 14b, 1 on C
4c on the radiation 13 (Fig. 2) at the same angular position at 120° intervals, and each pin hole 14a to 14
Pins 15a to 15c are slidably fitted into c,
For each concentric circle, the small diameter threaded portions of the pins 15a to 15c are screwed into the grinding wheel holder rings 16a to 16c and integrated, and a compression coil is provided between the rear end head of each pin 15a to 15c and the drive plate 7. A spring 17 is compressed, so that each pin 15a to 15c is normally biased toward the rear plate 3 side. Each holder ring 16a to 16c has a grindstone 18 with a different diameter.
Grindstone holder ring 1 having integrally a to 18c
9a to 19c are detachably attached. The grindstones 18a, 18b, 18c are, for example, 3″ (inch),
4" and 5", the particle size is different, for example, the particle size increases as the diameter increases. As shown in FIGS. 6 and 7, the whetstone holder ring 16c includes ribs 21 that protrude radially inward from three locations on the outer peripheral edge of the front surface, and a groove formed between the ribs 21 and the main body of the holder ring 16c. 22 is the rotation direction
It has a stopper surface 23 at the end opposite to _X1 .
On the other hand, as shown in FIGS. 8 and 9, the holder ring 19c is provided with ribs 24 that protrude outward in the radial direction from three locations on the inner peripheral edge of the rear surface and that are shaped to fit into the grooves 22. The width L ₁ is the circumferential width of the space 25 between adjacent ribs 21 (Fig. 6).
L is smaller than ₂ . Therefore, by fitting the rib 24 into the space 25 with the rear surface of the holder ring 19c facing the front surface of the holder ring 16c, and turning the holder ring 19c in the reverse _X1 direction, the rib 24 is fitted into the groove 22 and the two are integrated. can do. In that case, the rotational force of the holder ring 16c in the _X1 direction will be transmitted from the stopper surface 23 to the holder ring 19c via the rib 24.

As shown in FIG. 4, the plate 3 has three protrusions 27a on the front surface at equal intervals with a phase difference of 30 degrees so as to occupy 12 equally divided rays 13' on each of the concentric circles A, B, and C. It has 27b and 27c integrally. The plate 3 is also provided with a cylindrical flange 28 protruding forward on its outer peripheral edge, and the front edge of the flange 28 has recesses 29 at three adjacent locations on the 12-sector line.
a, 29b, and 29c are provided. Further, a protrusion 30 is provided on the outer peripheral edge of the rear surface of the drive plate 7 at a position on the extension line of the radiation 13 passing through the centers of the pair of pin holes 14a to 14c, and which engages with one of the recesses 29a to 29c. (Figure 2, Figure 3, Figure 10
figure). Marks 3″, 4″ near the recesses 29a to 29c,
5″ indicates the grindstone size.

In FIG. 1, the convex portion 30 as shown in FIG.
is engaged with the recess 29b, and the rear heads of the three pins 15b abut the forward protrusion 27b, so that the pin 1
5b and the grindstone 18b protrude forward against the elasticity of the spring 17. When the motor 1 is started in this state, the rotational force of the motor 1 is transmitted from the output shaft 2 to the whetstone 18b via the key 6, drive plate 7, pin 15b, whetstone holder rings 16b and 19b, and the whetstone 18b is transferred to the other whetstone 18a. , 18c, the surface of the stone can be polished using the grindstone 18b.

When switching the grindstone, stop motor 1 and
Grasp the flange 28 of the plate 3 with your left hand, grab the drive plate 7 with your right hand, pull the drive plate 7 forward from the plate 3 (in the direction of arrow F) against the elasticity of the spring 10, and remove the rear ends of the pins 15a to 15c. The head has a protrusion 2
7a to 27c (at this time, the convex part 30 escapes from the concave part 29b), turn the drive plate 7 to the right or left with respect to the plate 3, and move the convex part 30
into the recess 29a or 29c. Convex portion 30
When the drive plate 7 is released by meshing with the recess 29a, the rear end head of the pin 15a rides on the protrusion 27a, and only the grindstone 18a protrudes forward. Convex portion 30
When the pin 15c is fitted into the recess 29c and the drive plate 7 is released, the rear head of the pin 15c rides on the protrusion 27c, and the grinding wheel 1
Only 8c protrudes forward.

As explained above, in the present invention, the drive plate 7 is pulled out forward with respect to the plate 3, and the protrusion 30
from one of the concave portions 29a to 29c, rotate the plate 3 and drive plate 7 by 30 degrees relative to each other, and remove the convex portion 30.
Any one of the grinding wheels 18a to 18c can be made to protrude forward by simply fitting the grinding wheel into another one of the recesses 29a to 29c, and most of the time the task is to switch the currently used grindstone to another one with a different grain size. One-touch operation, no skill required for switching operation.
It's extremely easy. The auxiliary whetstone is pre-attached to the polisher, so when changing the whetstone,
There is no need to order another whetstone from a location far from the polisher, and you can quickly switch between polishers. The rotational force is transmitted to the grinding wheel holder rings 16a to 16c via a plurality of pins 15a to 15c on arbitrary concentric circles of the drive plate 7, so that no unreasonable force is applied to each part and it is reliable. .

Note that when embodying the present invention, the protrusions 27a to 27
The pin holes 14a to 14c are arranged in three equally spaced rays in the same manner as the pin holes 14a to 14c shown in FIG. It can also be placed on different rays. Also, the number of grindstones 18a to 18c is 2.
It may be four or more.

[Brief explanation of drawings]

Fig. 1 is a horizontal cross-sectional plan view of a part of a hand polisher to which the present invention is applied, Fig. 2 is a front view of the driving plate alone in Fig. 1 as viewed from the direction of the arrow, and Fig. 3 is Figure 4 is a front view of the plate alone in Figure 1, Figure 5 is a sectional view of Figure 4, and Figure 6 is a view of the grinding wheel holder ring alone in Figure 1. - Arrow view, Figure 7 is the same as Figure 6 -
8 is a cross-sectional view of another grinding wheel holder ring shown in FIG. 1, FIG. 9 is a cross-sectional view of FIG. 8, and FIG. 10 is a developed partial view of FIG. It is. DESCRIPTION OF SYMBOLS 1...Motor, 2...Output shaft, 3...Plate, 7...Drive plate, 10...Spring, 14a-14c
...Pin hole, 15a-15c...Pin, 16a-16
c...Whetstone holder ring, 27a-27c...protrusion, 29a-29c...recess, 30...protrusion, A,
B, C...Concentric circles.

Claims (1)

[Claims] 1. A drive plate is slidably fitted onto the output shaft protruding forward of the motor, is urged backward by a spring, and a plurality of pin holes are provided on a plurality of concentric circles of the drive plate, and each A pin fitted into the pin hole is urged backward, a grinding wheel holder ring is fixed to the front end, and a forward protrusion facing the rear end of the pin is provided on a plate supported on the output shaft behind the drive plate. A grinding wheel switching mechanism for a polisher, characterized in that only the pins on the concentric circles contact the opposing protrusions, and unevenness is provided between the plate and the drive plate, which engage with each other when the pins on the concentric circles project forward.