JP2006095667A - Polisher and its cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent damage of an internal component in a housing and degradation of workability due to water injected to a polishing part. <P>SOLUTION: A cover 16 is provided on a semicircular dish-shaped part 19 for covering the rear part of a pad 5 in a non-contact state in a gear housing of a polisher 1. Passage parts 22, 22, which are made to communicate with the inside of the dish-shaped part 19 by a through-hole 25 and laterally opened, are symmetrically and continuously provided to the rearmost position of the dish-shaped part 19 of the cover 16. When polishing work is executed by inclining the pad 5 rearward or setting the pad 5 vertically, the water injected to the polishing part from a water injection path 13 of a spindle 4 can be prevented from intruding into the body housing 2 side by discharging the water to the outside from the lateral passage parts 22, 22 after receiving the water with the rear wall part 21a at the dish-shaped part 19. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a disc-shaped polishing body is attached orthogonally to a spindle protruding downward from a housing, and polishing of the material to be polished can be performed by rotating the polishing body. The present invention relates to a grinder such as a grinder or a polisher provided with water injection means, and a cover for a grinder mounted on the grinder and covering a polishing body.

For example, in a grinder, a spindle that rotates by driving a motor is protruded downward at one end of a housing, and a disk-shaped grindstone (abrasive body) is orthogonally connected to the spindle, and the grindstone is rotated so that a stone or the like is covered. This makes it possible to polish abrasive materials.
Further, in such a polishing machine, a cover that covers the upper and rear surfaces of the grindstone in a non-contact manner is attached to the lower surface of the housing so that dust generated during the polishing process does not scatter to the operator side ( For example, see Patent Document 1).
Further, the polishing machine may be provided with water injection means for the polishing section for the purpose of preventing dust scattering and cooling the material to be polished. For example, a flexible tube connected to an external pump is guided into the housing and ejected from the tip of the spindle via a supply path in the housing, thereby allowing water to be poured into the polishing section.

JP 2000-117634 A

  However, when the polishing machine is supported so that the polishing body tilts backward from the horizontal posture or is supported vertically, the water poured into the polishing section or rotation of the polishing body In this case, the mist-like moisture generated along with the sag drops downward from the vertically oriented polishing body, so that it cannot be received by the cover, and the water often flows to the housing side through the cover. Since the housing has an air inlet for cooling air for the motor, water or mist-like water may enter from the air inlet and damage internal components such as a bearing. In addition, when the polishing machine operates with an external AC power supply, an earth leakage breaker is installed, but since the earth leakage breaker frequently operates due to intrusion of water, etc., the work is interrupted, so workability is significantly reduced. Resulting in.

  Accordingly, the invention described in claims 1 and 4 provides a polishing machine cover and a polishing machine that can effectively prevent damage to internal parts of the housing and deterioration of workability due to water in a polishing machine having a water injection function. It is for the purpose.

In order to achieve the above object, the invention according to claim 1 is the invention of the cover for a polishing machine, wherein a passage portion that communicates with the space on the polishing body side and opens in the left-right direction is continuously provided at the rearmost position. It is characterized by.
According to the second aspect of the present invention, in addition to the object of the first aspect, the passage portion is provided symmetrically with respect to the polishing body in order to perform the discharge processing of water or the like more reliably.
In addition to the object of the first or second aspect, the invention according to the third aspect is more advantageous than the polishing body at the lower end of the rear wall portion covering the rear surface of the polishing body so that water or the like can be reliably guided to the passage portion. Is also provided with a forward folding portion at a lower position.

  In order to achieve the above object, the invention according to claim 4 is an invention of a polishing machine in which a disk-shaped polishing body is attached orthogonally to a spindle projecting downward from a housing, and the polishing body is rotated by rotation. 4. A polishing machine capable of polishing a polishing material and provided with water injection means for injecting water into a polishing portion by a polishing body, and mounting the cover for the polishing machine according to any one of claims 1 to 3 on a housing It is characterized by that.

According to the first and fourth aspects of the present invention, water or mist-like moisture can be reliably discharged on the polishing machine cover side using the passage portion, and the intrusion of water or the like from the housing inlet is effective. Can be prevented. Therefore, there is no risk of damaging internal parts such as bearings, and when the polishing machine operates with an external AC power supply, workability is not reduced by frequent operation of the earth leakage breaker, improving reliability and usability. .
According to the second aspect of the present invention, in addition to the effect of the first aspect, when the polishing machine is tilted in the left-right direction when the polishing body is tilted backward or vertical, One passage portion can discharge water and the like, which increases reliability.
According to the third aspect of the invention, in addition to the effect of the first or second aspect, the folded portion can store the water without overflowing the water in the space on the polishing body side. Can be directed to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a polisher as an example of a polishing machine, and FIG. 2 is a bottom view of a tip portion. In the polisher 1, a bevel gear is located in front of a main body housing 2 containing a motor (not shown) (left side in FIG. 1). A gear housing 3 having a speed reducing mechanism is connected. A spindle 4 projects downward on the lower surface of the gear housing 3, and a disk-like pad 5 serving as a polishing body is orthogonal to the lower end of the spindle 4. It is connected. A power cord (not shown) is connected to the rear end of the main body housing 2 so that an external AC power source can be obtained.
The pad 5 is connected to the spindle 4 by screwing a nut portion 7 at the center of the pad 5 into a male screw portion 6 formed on the spindle 4. A switch 8 is provided on the upper surface of the motor housing 2, and an intake port (not shown) for taking in cooling air for the motor is formed in the lower rear surface of the main body housing 2.

  In addition, a connector tube 10 having a flexible tube 11 connected to the front end is supported in the front-rear direction by a bracket 9 on the rear lower surface of the main body housing 2, and the front end of the flexible tube 11 is formed on the lower surface of the gear housing 3. It is inserted into a circular portion 12 concentric with the spindle 4 and is connected to water injection passages 13, 13... Formed in the axial direction in the spindle 4 and opened at the front end surface of the spindle 4. This is water injection means. When an external pump is connected to the connector pipe 10 and a valve (not shown) is opened by operating a lever 14 provided on the connector pipe 10, water supplied from the pump is ejected from the tip of the spindle 4. Will do. In the center of the pad 5, an opening 15 is formed to expose the tip of the spindle 4 on the back surface of the pad 5.

  On the other hand, the gear housing 3 is provided with a cover 16 serving as a polishing machine cover of the present invention. The cover 16 is externally mounted on a circular portion 12 continuously provided below the gear housing 3, and a ring-shaped mounting portion 18 fastened by a band 17, and a semicircle extending integrally with the mounting portion 18. As shown in FIGS. 3 to 5, the dish-shaped portion 19 is an upper wall 20 that covers the upper portion of the pad 5 in a non-contact manner in a state of being attached to the circular portion 12. , And a side wall 21 that covers the rear surface of the pad 5 in a non-contact manner along the periphery of the upper wall 20. Reference numeral 31 denotes a slit provided in the vertical direction behind the mounting portion 18 in order to allow connection of the flexible tube 11 to the circular portion 12.

  In the cover 16, the side wall 21 located at the center of the rear part of the dish-like part 19 becomes a flat rear wall part 21 a extending in the left-right direction tangentially to the upper wall 20, with both ends slightly facing rearward. It is made to curve. At the left and right ends of the rear wall portion 21a, the upper edge side is continuously connected by the upper wall 20 and the guide wall 23, and the lower edge side becomes a folded portion 24 that bends forward over the entire length, thereby forming a dish-like portion. In the left-right symmetric position about 19, passage portions 22, 22 that open in the left-right direction are connected at the rearmost position. In addition, through holes 25 and 25 are formed between the side wall 21 and the rear wall portion 21 a so that the left and right passage portions 22 and 22 communicate with the inside of the dish-shaped portion 19. Further, a folded portion 26 that bends forward is formed at the lower end of the central portion of the rear wall portion 21 a as well as the folded portion 24 of the passage portion 22.

A groove 27 having an inverted T-shaped cross section is provided in the lower end surface of the side wall 21 over substantially the entire circumference, and a brush 28 is provided in the groove 27. This brush 28 is made by implanting synthetic resin hair materials 30, 30... In a synthetic resin base material 29 having the same cross-sectional shape as that of the groove 27 at predetermined intervals. 29 is fitted along the groove 27, so that the bristle materials 30, 30,...
As shown in FIG. 1, the lower end of the side wall 21 and the rear wall portion 21a of the dish-shaped portion 19 is set slightly below the bottom surface of the pad 5 when viewed in the axial direction of the spindle 4, that is, the folded portion. 26 is set to be positioned below the pad 5.

  In the polisher 1 configured as described above, when the motor is driven by turning on the switch 8, the pad 5 rotates together with the spindle 4, and the object to be polished such as stone is polished by the grinding surface on the lower surface of the pad 5. be able to. During this polishing process, when the lever 14 is operated to open the valve in the connector pipe 10, the water sent from the pump is ejected from the water injection channels 13, 13. The dust generated from the air is taken in and discharged to the outside. At the same time, the material to be polished is cooled.

  On the other hand, when the body housing 2 is supported so that the pad 5 is largely inclined backward from the horizontal posture, or further supported so as to be vertical, and polishing is performed on a non-horizontal polishing surface or the like, The water sprayed from the spindle 4 to the polishing part may travel down the pad 5 as it is, or may radiate in the dish-like part 19 by the rotation of the pad 5 and then propagate along the inner surface of the side wall 21. In the case of tilting, water is collected at the center of the rear wall portion 21a which is the lowermost part. At this time, since the folded-back portion 26 is formed on the rear wall portion 21 a, water does not overflow outside the dish-shaped portion 19 and is temporarily stored below the dish-shaped portion 19. As the pad 5 rotates, the water jetted to the polishing portion may scatter in the form of a mist, which is also stored below the dish-like portion 19.

  The water or mist-like water stored in this way flows through the left and right through holes 25 and 25 as they are to the passage portions 22 and 22, and then flows down from the tip that curves downward through the passage portions 22. Here, since the folded portion 24 is also provided in the passage portion 22, water is surely guided to the tip of the passage portion 22 without overflowing in the middle of the passage portion 22. Note that the water adhering to the outer surface of the side wall 21 also flows along the outer surface of the side wall 21 and joins the passage portion 22.

Thus, according to the cover 16 and the polisher 1 to which the cover 16 is mounted, the passage portions 22 and 22 that communicate with the space on the pad 5 side and open in the left-right direction are provided at the rearmost position of the cover 16. By providing them continuously, water or mist-like moisture can be reliably discharged on the cover 16 side using the passage portions 22, 22, and entry of water or the like from the intake port of the main body housing 2 can be effectively prevented. . Therefore, there is no risk of damaging internal components such as bearings, and there is no deterioration in workability due to frequent operation of the earth leakage circuit breaker, improving reliability and usability.
Further, by providing the passage portions 22 and 22 symmetrically about the pad 5, even when the polisher 1 is tilted in the left-right direction when the pad 5 is tilted rearward or vertical, Either one of the passage portions 22 can discharge water or the like, and the reliability of the discharge processing is increased.
Further, by providing a forward folding portion 26 at the lower end of the rear wall portion 21a below the pad 5, the dish-shaped portion 19 can be temporarily stored without overflowing water, etc. It is possible to reliably guide water or the like in the passage 19 to the passage portions 22 and 22.

The passage part is formed deeper in an inverted U shape by making the folded part higher, or the folded part is eliminated and the rear wall part is inclined so as to approach the pad side as it goes to the lower end. In addition, the design may be changed as appropriate, such as a semicircular cross section or an elliptical passage portion, and it is not limited to the one having the front side opened as in the above embodiment, and may be a cylindrical body having only the tip opened.
In addition, the passage portion is not limited to left-right symmetry, and may be changed in size on the left and right sides, or may be formed on either one of the left and right sides. It is also possible to make the cross-sectional shape larger than in the case of left-right symmetry, or to increase the opening area of the through-hole that communicates the passage portion and the space on the polishing body side.

On the other hand, the cover is not limited to the semicircular shape of the above-described form, and may be a full circle that covers the entire polishing body, and is not limited to a semicircle or a full circle. In the case of a square shape, a structure in which openings are simply formed on the left and right side surfaces may be used as the passage portion. In addition, it is preferable that the cover is made of rubber as in the above-described form, because it can be deformed following the shape of the polished surface, and the operability is improved and there is no risk of damaging the material to be polished. However, it may be made of a synthetic resin or a composite product with rubber.
Further, a brush is not essential, and other dustproof materials such as bellows and elastic bodies may be used as long as a predetermined slip and dust collection effect with respect to the material to be polished can be obtained. Of course, the attaching means to the polishing machine can employ other methods such as screwing in addition to using a band.

In addition, the present invention is not limited to a polisher, and can be applied to a grinder or a sander as long as it is a polishing machine equipped with water injection means. The present invention is also applied to a DC machine that mounts a battery pack on a housing as a power source. Is possible.

It is side surface explanatory drawing of a polisher. It is bottom face explanatory drawing of the front part of a polisher. It is a bottom view of a cover (A) is a top view of a cover, (B) is an AA sectional view. (A) is the center longitudinal cross-sectional view of a cover, (B) is a BB sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Polisher, 2 ... Main body housing, 3 ... Gear housing, 4 ... Spindle, 5 ... Pad, 11 ... Flexible tube, 12 ... Circular part, 13 ... Water filling channel, 16 ... Cover, 18 ... Mounting part, 19 ... Dish shape 20, upper wall, 21 side wall, 22 passage portion, 24, 26 folded portion, 25 through-hole, 28 brush.

Claims (4)

A cover for a polishing machine that is mounted on a polishing machine in which a disk-shaped polishing body is mounted orthogonally on a spindle protruding downward from a housing, and covers at least the rear surface of the polishing body in a non-contact state in the mounted state. ,
A cover for a polishing machine, characterized in that a passage portion that communicates with the space on the polishing body side and opens in the left-right direction is provided at the rearmost position.   The polishing machine cover according to claim 1, wherein the passage portions are provided symmetrically about the polishing body.   The cover for a polishing machine according to claim 1 or 2, wherein a front folding portion is provided at a lower end of the rear wall portion covering the rear surface of the polishing body at a position lower than the polishing body. A disc-shaped polishing body is attached orthogonally to a spindle projecting downward from the housing, and the polishing material can be polished by rotating the polishing body, and water is injected into a polishing portion by the polishing body. A polishing machine equipped with means,
4. A polishing machine comprising the housing having the polishing machine cover according to claim 1 mounted thereon.

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