EP3785848B1 - Belt type grinding tool - Google Patents
Belt type grinding tool Download PDFInfo
- Publication number
- EP3785848B1 EP3785848B1 EP19792609.0A EP19792609A EP3785848B1 EP 3785848 B1 EP3785848 B1 EP 3785848B1 EP 19792609 A EP19792609 A EP 19792609A EP 3785848 B1 EP3785848 B1 EP 3785848B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outer peripheral
- peripheral portion
- belt
- drive pulley
- fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000002093 peripheral effect Effects 0.000 claims description 85
- 238000001816 cooling Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
Definitions
- the present invention relates to belt-type grinding tools. More particularly, the present invention relates to a belt-type grinding tool having a function of cooling an endless grinding belt.
- a belt-type grinding tool includes an idle pulley attached rotatably, a drive pulley to be rotationally driven by a motor, and an endless grinding belt wound between the idle pulley and the drive pulley.
- the endless grinding belt which is rotationally driven in response to the rotation of the drive pulley, is pressed against a material to be ground, thereby grinding the material (Patent Literature 1).
- Patent Literature 1 the endless grinding belt is heated by friction between itself and the material during the grinding operation.
- a belt sander disclosed in Patent Literature 2 has a fan provided on a driving roller. The fan is rotated, together with the driving roller, thereby sucking the outside air into the interior of the tool. The sucked air passes through inside the driving roller and is led into a dust bag by a dust collecting fan. Thus, the air flows around the shaft of the driving roller and the bearings rotatably supporting the roller shaft, and these members are cooled by the flow of air.
- US 7 044 841 B1 discloses a grinding machine including a driving unit, a grinding wheel unit, an abrasive belt unit and a dust-collecting device.
- the dust-collecting device includes a dust-discharging unit and a dust-guiding unit.
- the dust-discharging unit includes a dust-collecting seat disposed fixedly on a side cover of the grinding wheel unit, and a suction fan assembly disposed within the dust-collecting seat.
- the dust-guiding unit includes a conduit communicated with a dust-receiving chamber in the grinding wheel unit and an accommodating chamber in the abrasive belt unit.
- the grinding wheel unit, the abrasive belt unit and the suction fan assembly are driven by the driving unit. Dust is induced by the suction fan assembly to move from the dust-receiving chamber and the accommodating chamber into the dust-collecting seat.
- the endless grinding belt is usually formed by bonding together the opposite ends of a belt-shaped material with an adhesive into an endless belt shape. In this regard, if the bonded portions heat up excessively, the adhesive may melt, which may result in rupture of the belt.
- the endless grinding belt is cooled indirectly to a certain extent by cooling the driving roller.
- the belt sander is configured to cool mainly the shaft of the driving roller and the bearings and is therefore unsatisfactory in terms of the cooling effect on the endless grinding belt.
- an object of the present invention is to provide a belt-type grinding tool configured to be capable of efficiently cooling an endless grinding belt wound between an idle pulley and a drive pulley.
- the present invention provides a belt-type grinding tool including the following elements: a tool body including a motor; an idle pulley rotatably attached to the tool body; a drive pulley to be rotatably driven by the motor and having a cylindrical outer peripheral portion configured to support an endless grinding belt wound between the drive pulley and the idle pulley; a fan at least partially disposed radially inside the outer peripheral portion, the fan being configured to rotate together with the drive pulley to generate a flow of air passing through inside the outer peripheral portion in the direction of a rotation axis of the drive pulley; a cover having a cover plate portion disposed adjacent to one side end edge of the outer peripheral portion in the direction of the rotation axis, the cover defining between itself and the tool body an accommodating space accommodating the drive pulley, the cover plate portion having an inner opening portion and an outer opening portion, the inner opening portion opening into the accommodating space at a position radially inward of an inner peripheral surface of the outer peripheral portion, and the outer opening portion opening into the accommodating space at
- the belt-type grinding tool of the present invention is configured such that the air sucked into the accommodating space by the fan passes not only through inside the outer peripheral portion of the drive pulley but also through outside the outer peripheral portion. Accordingly, not only the drive pulley but also the endless grinding belt, which is supported on the outer peripheral surface of the outer peripheral portion, is directly cooled. Thus, the endless grinding belt can be cooled even more efficiently, and it is possible to prevent the rupture of the belt due to heat.
- the arrangement may be as follows.
- the cover plate portion has a slot extending from a position radially inward of the inner peripheral surface of the outer peripheral portion to a position radially outward of the inner peripheral surface of the outer peripheral portion.
- the inner opening portion and the outer opening portion are each formed as a part of the slot.
- the slot may be curved with respect to a radial direction about the rotation axis.
- the opening area can be increased in comparison with a rectilinear hole, and the air can be sucked into the accommodating space even more efficiently.
- the slot may have a size such that a human finger cannot enter the slot.
- a size such that a human finger cannot enter the slot means a size such that a test finger selected in conformity with the use environment cannot reach into the accommodating space.
- the drive pulley further includes a center secured portion connected to a rotating shaft drivably connected to the motor, and a connecting portion extending from the outer peripheral portion to the center secured portion.
- the connecting portion has a through-hole extending therethrough in the direction of the rotation axis. The airflow path is configured to pass through the through-hole.
- the arrangement may be as follows.
- the fan When the fan is rotated, the outside air is sucked into the accommodating space from the inner opening portion to flow along the airflow path such that the air passes through inside the outer peripheral portion, passes through the through-hole, turns around the other side end edge of the outer peripheral portion, passes through outside the outer peripheral portion, and is discharged to the outside of the accommodating space from the outer opening portion.
- the arrangement may be as follows.
- the fan has a plurality of blades arranged at a first space in a circumferential direction of the outer peripheral portion, and the through-hole includes a plurality of the through-holes arranged in the circumferential direction at a second space.
- the first space and the second space are different from one another.
- a gap in the direction of the rotation axis may be formed between the fan and the connecting portion of the drive pulley. This makes it possible to prevent the through-hole from being closed by the fan.
- a belt-type grinding tool 10 includes, as shown in Figs. 1 to 3 , a tool body 12 extending in the direction of a longitudinal axis L, an idle pulley 16 rotatably attached to a distal end portion 14 of the tool body 12, and a drive pulley 22 secured to a rotating shaft 20.
- the rotating shaft 20 is drivably connected to an electric motor 18 of the tool body 12.
- An endless grinding belt 24 is wound between the idle pulley 16 and the drive pulley 22.
- the drive pulley 22 is driven to rotate counterclockwise as seen in Fig. 2 by the electric motor 18. In response to the rotation of the drive pulley 22, the endless grinding belt 24 is also rotated in the same direction.
- the tool body 12 has a shoe 25 attached thereto so as to extend along an inner peripheral surface 24a of the endless grinding belt 24.
- the rotating endless grinding belt 24 is pressed against a material to be ground at a position thereof supported by the shoe 25 from the inside, thereby performing a grinding operation for the material to be ground.
- the drive pulley 22 has, as shown in Fig. 3 , a cylindrical center secured portion 26 secured to the rotating shaft 20, a cylindrical outer peripheral portion 28 supporting the endless grinding belt 24, and a connecting portion 30 extending in a radial direction about a rotation axis R of the drive pulley 22 to connect the center secured portion 26 and the outer peripheral portion 28 to each other.
- the drive pulley 22 is secured to the rotating shaft 20 by a hexagon nut 32 threadedly engaged with the rotating shaft 20.
- the outer peripheral portion 28 has side end edges 28a and 28b at opposite sides thereof in the direction of the rotation axis R.
- the side end edges 28a and 28b have flange portions 34, respectively, for preventing the endless grinding belt 24 from coming off.
- a fan 36 is provided radially inside the outer peripheral portion 28.
- the fan 36 has a center secured portion 38 and blades 40 extending radially outward from the center secured portion 38. As will be clear from Fig. 2 , there are five blades 40 arranged at equal spaces in the circumferential direction.
- the fan 36 is secured to the hexagon nut 32 by a securing screw 42, with a part of the hexagon nut 32 received in the center secured portion 38.
- An inner peripheral surface 38a of the center secured portion 38, which receives the hexagon nut 32, has a hexagonal shape sized to the outer diameter of the hexagon nut 32 so that the fan 36 is surely secured to the hexagon nut 32 in the rotational direction.
- the securing screw 42 is secured in a state where an end face 42a thereof abuts against an end face 20a of the rotating shaft 20. Consequently, the hexagon nut 32 and the securing screw 42 cannot easily become loosened.
- An O-ring 44 is disposed between the fan 36 and the hexagon nut 32 so that the fan 36 is pressed against the head of the securing screw 42 to thereby suppress backlash of the fan 36.
- the fan 36 is wholly disposed inside the outer peripheral portion 28. However, the configuration may be varied such that a part of the fan 36 projects to the outside of the outer peripheral portion 28.
- the connecting portion 30 of the drive pulley 22 has through-holes 46 formed to extend therethrough in the direction of the rotation axis R.
- a gap 48 in the direction of the rotation axis R is formed between the blades 40 of the fan 36 and the connecting portion 30 of the drive pulley 22 to avoid the through-holes 46 of the connecting portion 30 being closed by the blades 40 of the fan 36, thereby preventing interference with the flow of air (described later).
- the tool body 12 further has a cover 52 attached thereto by a securing screw 50.
- the cover 52 has a secured portion 54 secured to the tool body 12 by the securing screw 50, and a cover plate portion 56 disposed adjacent to one side end edge 28a of the outer peripheral portion 28 in the direction of the rotation axis R.
- the cover 52 defines between itself and the tool body 12 an accommodating space 58 accommodating the drive pulley 22.
- the cover plate portion 56 has, as shown in Fig. 1 , a plurality of slots 60 curved with respect to the radial direction about the rotation axis R.
- Each slot 60 extends from a position radially inward of the inner peripheral surface 28c of the outer peripheral portion 28 of the drive pulley 22 to a position radially outward of the inner peripheral surface 28c of the outer peripheral portion 28, and has an inner opening portion 62 opening into the accommodating space 58 at a position radially inward of the inner peripheral surface 28c of the outer peripheral portion 28, and an outer opening portion 64 opening into the accommodating space 58 at a position radially outward of the inner peripheral surface 28c of the outer peripheral portion 28.
- the slots 60 each have a size such that a human finger cannot reach into the accommodating space 58.
- the slots 60 are designed to have a size such that a test finger selected in conformity with the use environment cannot reach into the accommodating space 58.
- the test finger used in the design of this embodiment was prepared in compliance with International Electrotechnical Commission Standards IEC60529.
- the cover plate portion 56 has an arrow-shaped hole 66 formed in the vicinity of the center thereof to indicate the rotational direction of the drive pulley 22.
- the belt-type grinding tool 10 has airflow paths 68 formed therein as shown by the arrows in Fig. 3 .
- Each airflow path 68 extends from the inner opening portion 62 of the cover 52 to pass through inside the outer peripheral portion 28 of the drive pulley 22, and after passing through the through-hole 46 in the connecting portion 30, the airflow path 68 turns around the other side end edge 28b of the outer peripheral portion 28 to pass through outside the outer peripheral portion 28 to reach the outer opening portion 64.
- the fan 36 which is disposed inside the drive pulley 22, is secured to the rotating shaft 20; therefore, when the drive pulley 22 is driven to rotate, the fan 36 rotates, together with the drive pulley 22, as has been described above.
- the air further passes through outside the outer peripheral portion 28 and is discharged to the outside of the accommodating space 58 from the outer opening portions 64.
- a part of the air discharged from the outer opening portions 64 is sucked into the accommodating space 58 again from the inner opening portions 62 along the slots 60 or after once exiting to the outside of the cover 52.
- the accommodating space 58 is open at a forward portion 58b (upper portion as seen in Figs. 1 and 2 ) and at a lower portion 58c (left portion as seen in Figs. 1 and 2 ). Therefore, a part of the air sucked into the accommodating space 58 is also discharged to the outside of the accommodating space 58 from the forward portion 58b and the lower portion 58c after passing through the through-holes 46. Because the endless grinding belt 24 passes through the forward portion 58b and the lower portion 58c, a part of the air discharged from the forward portion 58b and the lower portion 58c is blown over the endless grinding belt 24.
- the outside air sucked into the accommodating space 58 by the fan 36 passes through both inside and outside the outer peripheral portion 28 of the drive pulley 22; therefore, the drive pulley 22 can be cooled even more efficiently. Accordingly, the endless grinding belt 24 can be cooled even more efficiently through the drive pulley 22.
- the air flowing along the airflow paths 68 also hits the endless grinding belt 24 directly when passing through outside the outer peripheral portion 28; therefore, the endless grinding belt 24 can also be cooled directly. Consequently, it is possible to perform cooling of the endless grinding belt 24 more efficiently than in the conventional belt-type grinding tool 10, and hence possible to prevent the rupture of the endless grinding belt 24 due to heat.
- the slots 60 extend from the inside to outside of the outer peripheral portion 28 of the drive pulley 22 and are located at the position of the one side end edge 28a of the outer peripheral portion 28. Therefore, when sucked through the slots 60, the air is blown over the outer peripheral portion 28 at the side end edge 28a. This also makes it possible to cool the drive pulley 22 efficiently and hence possible to prevent the rupture of the endless grinding belt 24 due to heat even more surely. Further, a part of the air discharged from the forward portion 58b and lower portion 58c of the accommodating space 58 is blown over the endless grinding belt 24. This also enables cooling of the endless grinding belt 24.
- a cover 152 shown in Fig. 4 has inner opening portions 162 and outer opening portions 164 which are formed as independent holes, respectively. In this case, however, no air is blown over the outer peripheral portion 28 of the drive pulley 22.
- slots 260 In a cover 252 shown in Fig. 5 , slots 260 have a bent shape so that outer opening portions 264 have a larger area.
- the curve direction of slots 360 is opposite to that in the cover 52 shown in Fig. 1 .
- the present invention is not limited to these embodiments.
- the outside air is sucked from the inner opening portions and discharged from the outer opening portions
- the air may be made to flow reversely by reversing the rotational direction of the drive pulley or by reversing the direction of the blades of the fan.
- the arrangement may be as follows.
- the outside air is sucked into the accommodating space from the outer opening portions to pass through outside the outer peripheral portion of the drive pulley.
- the air turns around the other side end edge of the outer peripheral portion and passes through the through-holes in the connecting portion and through inside the outer peripheral portion and is discharged to the outside of the accommodating space from the inner opening portions.
- the belt-type grinding tool may include only either of the configurations. Such an arrangement still makes it possible to obtain a cooling effect sufficiently superior to that of the conventional technique. Further, it is possible to change the number of blades of the fan and the number of through-holes in the connecting portion.
Description
- The present invention relates to belt-type grinding tools. More particularly, the present invention relates to a belt-type grinding tool having a function of cooling an endless grinding belt.
- A belt-type grinding tool includes an idle pulley attached rotatably, a drive pulley to be rotationally driven by a motor, and an endless grinding belt wound between the idle pulley and the drive pulley. The endless grinding belt, which is rotationally driven in response to the rotation of the drive pulley, is pressed against a material to be ground, thereby grinding the material (Patent Literature 1). With such a belt-type grinding tool, the endless grinding belt is heated by friction between itself and the material during the grinding operation.
- As the endless grinding belt is heated, the drive pulley, the motor shaft, etc. also heat up, and particularly, bearings rotatably supporting these components may be degraded by heat. To solve such a problem, a belt sander disclosed in Patent Literature 2, for example, has a fan provided on a driving roller. The fan is rotated, together with the driving roller, thereby sucking the outside air into the interior of the tool. The sucked air passes through inside the driving roller and is led into a dust bag by a dust collecting fan. Thus, the air flows around the shaft of the driving roller and the bearings rotatably supporting the roller shaft, and these members are cooled by the flow of air.
US 7 044 841 B1 -
- Patent Literature 1:
Japanese Patent Application Publication No. 2014-166668 JP 2014-166668 A - Patent Literature 2:
Japanese Examined Utility Model Application Publication No. Hei 6-13827 JPH06-13827Y - Another problem encountered when the endless grinding belt is heated is the rupture of the endless grinding belt. The endless grinding belt is usually formed by bonding together the opposite ends of a belt-shaped material with an adhesive into an endless belt shape. In this regard, if the bonded portions heat up excessively, the adhesive may melt, which may result in rupture of the belt. In the above-described conventional belt sander, the endless grinding belt is cooled indirectly to a certain extent by cooling the driving roller. The belt sander, however, is configured to cool mainly the shaft of the driving roller and the bearings and is therefore unsatisfactory in terms of the cooling effect on the endless grinding belt.
- Accordingly, an object of the present invention is to provide a belt-type grinding tool configured to be capable of efficiently cooling an endless grinding belt wound between an idle pulley and a drive pulley. Solution to Problem:
- The invention is set out in the appended set of claims.
- The present invention provides a belt-type grinding tool including the following elements: a tool body including a motor; an idle pulley rotatably attached to the tool body; a drive pulley to be rotatably driven by the motor and having a cylindrical outer peripheral portion configured to support an endless grinding belt wound between the drive pulley and the idle pulley; a fan at least partially disposed radially inside the outer peripheral portion, the fan being configured to rotate together with the drive pulley to generate a flow of air passing through inside the outer peripheral portion in the direction of a rotation axis of the drive pulley; a cover having a cover plate portion disposed adjacent to one side end edge of the outer peripheral portion in the direction of the rotation axis, the cover defining between itself and the tool body an accommodating space accommodating the drive pulley, the cover plate portion having an inner opening portion and an outer opening portion, the inner opening portion opening into the accommodating space at a position radially inward of an inner peripheral surface of the outer peripheral portion, and the outer opening portion opening into the accommodating space at a position radially outward of the inner peripheral surface of the outer peripheral portion; and an airflow path provided in the accommodating space, the airflow path extending from the inner opening portion to pass through inside the outer peripheral portion and turning around the other side end edge of the outer peripheral portion to pass through outside the outer peripheral portion to reach the outer opening portion. When the fan is rotated, the outside air is sucked into the accommodating space from one of the inner opening portion and the outer opening portion to flow along the airflow path and discharged to the outside of the accommodating space from the other of the inner opening portion and the outer opening portion.
- The belt-type grinding tool of the present invention is configured such that the air sucked into the accommodating space by the fan passes not only through inside the outer peripheral portion of the drive pulley but also through outside the outer peripheral portion. Accordingly, not only the drive pulley but also the endless grinding belt, which is supported on the outer peripheral surface of the outer peripheral portion, is directly cooled. Thus, the endless grinding belt can be cooled even more efficiently, and it is possible to prevent the rupture of the belt due to heat.
- Specifically, the arrangement may be as follows. The cover plate portion has a slot extending from a position radially inward of the inner peripheral surface of the outer peripheral portion to a position radially outward of the inner peripheral surface of the outer peripheral portion. The inner opening portion and the outer opening portion are each formed as a part of the slot.
- Preferably, the slot may be curved with respect to a radial direction about the rotation axis. With this arrangement, the opening area can be increased in comparison with a rectilinear hole, and the air can be sucked into the accommodating space even more efficiently.
- Preferably, the slot may have a size such that a human finger cannot enter the slot. Thus, it is possible to prevent a human finger from accidentally touching the rotating drive pulley or endless grinding belt, which would otherwise cause an injury. It should be noted that the term "a size such that a human finger cannot enter the slot" means a size such that a test finger selected in conformity with the use environment cannot reach into the accommodating space.
- Specifically, the arrangement may be as follows. The drive pulley further includes a center secured portion connected to a rotating shaft drivably connected to the motor, and a connecting portion extending from the outer peripheral portion to the center secured portion. The connecting portion has a through-hole extending therethrough in the direction of the rotation axis. The airflow path is configured to pass through the through-hole.
- More specifically, the arrangement may be as follows. When the fan is rotated, the outside air is sucked into the accommodating space from the inner opening portion to flow along the airflow path such that the air passes through inside the outer peripheral portion, passes through the through-hole, turns around the other side end edge of the outer peripheral portion, passes through outside the outer peripheral portion, and is discharged to the outside of the accommodating space from the outer opening portion.
- Preferably, the arrangement may be as follows. The fan has a plurality of blades arranged at a first space in a circumferential direction of the outer peripheral portion, and the through-hole includes a plurality of the through-holes arranged in the circumferential direction at a second space. The first space and the second space are different from one another.
- More preferably, a gap in the direction of the rotation axis may be formed between the fan and the connecting portion of the drive pulley. This makes it possible to prevent the through-hole from being closed by the fan.
- Embodiments of a belt-type grinding tool according to the present invention will be explained below on the basis of the accompanying drawings.
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Fig. 1 is a side view of a belt-type grinding tool according to an embodiment of the present invention. -
Fig. 2 is a side view of the belt-type grinding tool inFig. 1 , with a cover removed therefrom. -
Fig. 3 is a fragmentary sectional view taken along the line A-A inFig. 1 . -
Fig. 4 is an illustration showing a second embodiment of the cover. -
Fig. 5 is an illustration showing a third embodiment of the cover. -
Fig. 6 is an illustration showing a fourth embodiment of the cover. -
Fig. 7 is an illustration showing a fifth embodiment of the cover. - A belt-
type grinding tool 10 according to an embodiment of the present invention includes, as shown inFigs. 1 to 3 , atool body 12 extending in the direction of a longitudinal axis L, anidle pulley 16 rotatably attached to adistal end portion 14 of thetool body 12, and adrive pulley 22 secured to arotating shaft 20. The rotatingshaft 20 is drivably connected to anelectric motor 18 of thetool body 12. An endless grindingbelt 24 is wound between theidle pulley 16 and thedrive pulley 22. Thedrive pulley 22 is driven to rotate counterclockwise as seen inFig. 2 by theelectric motor 18. In response to the rotation of thedrive pulley 22, the endless grindingbelt 24 is also rotated in the same direction. Thetool body 12 has ashoe 25 attached thereto so as to extend along an innerperipheral surface 24a of the endless grindingbelt 24. The rotating endless grindingbelt 24 is pressed against a material to be ground at a position thereof supported by theshoe 25 from the inside, thereby performing a grinding operation for the material to be ground. - The
drive pulley 22 has, as shown inFig. 3 , a cylindrical center securedportion 26 secured to therotating shaft 20, a cylindrical outerperipheral portion 28 supporting the endless grindingbelt 24, and a connectingportion 30 extending in a radial direction about a rotation axis R of thedrive pulley 22 to connect the center securedportion 26 and the outerperipheral portion 28 to each other. Thedrive pulley 22 is secured to therotating shaft 20 by ahexagon nut 32 threadedly engaged with the rotatingshaft 20. The outerperipheral portion 28 has side end edges 28a and 28b at opposite sides thereof in the direction of the rotation axis R. The side end edges 28a and 28b haveflange portions 34, respectively, for preventing the endless grindingbelt 24 from coming off. - A
fan 36 is provided radially inside the outerperipheral portion 28. Thefan 36 has a center securedportion 38 andblades 40 extending radially outward from the center securedportion 38. As will be clear fromFig. 2 , there are fiveblades 40 arranged at equal spaces in the circumferential direction. Thefan 36 is secured to thehexagon nut 32 by a securingscrew 42, with a part of thehexagon nut 32 received in the center securedportion 38. An innerperipheral surface 38a of the center securedportion 38, which receives thehexagon nut 32, has a hexagonal shape sized to the outer diameter of thehexagon nut 32 so that thefan 36 is surely secured to thehexagon nut 32 in the rotational direction. The securingscrew 42 is secured in a state where anend face 42a thereof abuts against anend face 20a of therotating shaft 20. Consequently, thehexagon nut 32 and the securingscrew 42 cannot easily become loosened. An O-ring 44 is disposed between thefan 36 and thehexagon nut 32 so that thefan 36 is pressed against the head of the securingscrew 42 to thereby suppress backlash of thefan 36. Thefan 36 is wholly disposed inside the outerperipheral portion 28. However, the configuration may be varied such that a part of thefan 36 projects to the outside of the outerperipheral portion 28. - The connecting
portion 30 of thedrive pulley 22 has through-holes 46 formed to extend therethrough in the direction of the rotation axis R. There are eight through-holes 46 provided at equal spaces in the circumferential direction. InFig. 2 , some of the through-holes 46 are hidden behind theblades 40 of thefan 36 and cannot be seen. By arranging theblades 40 of thefan 36 and the through-holes 46 at mutually different spaces in the circumferential direction, it is possible to avoid the fronts of all the through-holes 46 being blocked by theblades 40 no matter in which orientation thefan 36 is mounted relative to the drivepulley 22 in the rotational direction. In addition, agap 48 in the direction of the rotation axis R is formed between theblades 40 of thefan 36 and the connectingportion 30 of thedrive pulley 22 to avoid the through-holes 46 of the connectingportion 30 being closed by theblades 40 of thefan 36, thereby preventing interference with the flow of air (described later). - The
tool body 12 further has acover 52 attached thereto by a securingscrew 50. Thecover 52 has a securedportion 54 secured to thetool body 12 by the securingscrew 50, and acover plate portion 56 disposed adjacent to oneside end edge 28a of the outerperipheral portion 28 in the direction of the rotation axis R. Thecover 52 defines between itself and thetool body 12 anaccommodating space 58 accommodating thedrive pulley 22. Thecover plate portion 56 has, as shown inFig. 1 , a plurality ofslots 60 curved with respect to the radial direction about the rotation axis R. Eachslot 60 extends from a position radially inward of the innerperipheral surface 28c of the outerperipheral portion 28 of thedrive pulley 22 to a position radially outward of the innerperipheral surface 28c of the outerperipheral portion 28, and has aninner opening portion 62 opening into theaccommodating space 58 at a position radially inward of the innerperipheral surface 28c of the outerperipheral portion 28, and anouter opening portion 64 opening into theaccommodating space 58 at a position radially outward of the innerperipheral surface 28c of the outerperipheral portion 28. It should be noted that theslots 60 each have a size such that a human finger cannot reach into theaccommodating space 58. Specifically, theslots 60 are designed to have a size such that a test finger selected in conformity with the use environment cannot reach into theaccommodating space 58. The test finger used in the design of this embodiment was prepared in compliance with International Electrotechnical Commission Standards IEC60529. Thecover plate portion 56 has an arrow-shapedhole 66 formed in the vicinity of the center thereof to indicate the rotational direction of thedrive pulley 22. - With the above-described configuration, the belt-
type grinding tool 10 hasairflow paths 68 formed therein as shown by the arrows inFig. 3 . Eachairflow path 68 extends from theinner opening portion 62 of thecover 52 to pass through inside the outerperipheral portion 28 of thedrive pulley 22, and after passing through the through-hole 46 in the connectingportion 30, theairflow path 68 turns around the otherside end edge 28b of the outerperipheral portion 28 to pass through outside the outerperipheral portion 28 to reach theouter opening portion 64. Thefan 36, which is disposed inside thedrive pulley 22, is secured to therotating shaft 20; therefore, when thedrive pulley 22 is driven to rotate, thefan 36 rotates, together with thedrive pulley 22, as has been described above. When thefan 36 rotates, a flow of air is generated which passes through inside the outerperipheral portion 28 of thedrive pulley 22 in the direction of the rotation axis R. Consequently, the air flows along theairflow paths 68. Specifically, the outside air is sucked into theaccommodating space 58 from theinner opening portions 62. The sucked air passes through inside the outerperipheral portion 28 of thedrive pulley 22, where thefan 36 is disposed, and passes through the through-holes 46 to exit to the outside of thedrive pulley 22. The air having passed through the through-holes 46 hits an innerperipheral surface 58a of theaccommodating space 58 to change the direction thereof to radially outward and turns around the otherside end edge 28b of the outerperipheral portion 28. The air further passes through outside the outerperipheral portion 28 and is discharged to the outside of theaccommodating space 58 from the outer openingportions 64. A part of the air discharged from the outer openingportions 64 is sucked into theaccommodating space 58 again from theinner opening portions 62 along theslots 60 or after once exiting to the outside of thecover 52. Theaccommodating space 58 is open at aforward portion 58b (upper portion as seen inFigs. 1 and2 ) and at alower portion 58c (left portion as seen inFigs. 1 and2 ). Therefore, a part of the air sucked into theaccommodating space 58 is also discharged to the outside of theaccommodating space 58 from theforward portion 58b and thelower portion 58c after passing through the through-holes 46. Because the endless grindingbelt 24 passes through theforward portion 58b and thelower portion 58c, a part of the air discharged from theforward portion 58b and thelower portion 58c is blown over the endless grindingbelt 24. - Thus, in the belt-
type grinding tool 10, the outside air sucked into theaccommodating space 58 by thefan 36 passes through both inside and outside the outerperipheral portion 28 of thedrive pulley 22; therefore, thedrive pulley 22 can be cooled even more efficiently. Accordingly, the endless grindingbelt 24 can be cooled even more efficiently through thedrive pulley 22. In addition, the air flowing along theairflow paths 68 also hits the endless grindingbelt 24 directly when passing through outside the outerperipheral portion 28; therefore, the endless grindingbelt 24 can also be cooled directly. Consequently, it is possible to perform cooling of the endless grindingbelt 24 more efficiently than in the conventional belt-type grinding tool 10, and hence possible to prevent the rupture of the endless grindingbelt 24 due to heat. - In the above-described embodiment, the
slots 60 extend from the inside to outside of the outerperipheral portion 28 of thedrive pulley 22 and are located at the position of the oneside end edge 28a of the outerperipheral portion 28. Therefore, when sucked through theslots 60, the air is blown over the outerperipheral portion 28 at theside end edge 28a. This also makes it possible to cool thedrive pulley 22 efficiently and hence possible to prevent the rupture of the endless grindingbelt 24 due to heat even more surely. Further, a part of the air discharged from theforward portion 58b andlower portion 58c of theaccommodating space 58 is blown over the endless grindingbelt 24. This also enables cooling of the endless grindingbelt 24. - The shape and layout of the
inner opening portions 62 and the outer openingportions 64, which are provided in thecover 52, can be changed at will. For example, acover 152 shown inFig. 4 has inner openingportions 162 and outer openingportions 164 which are formed as independent holes, respectively. In this case, however, no air is blown over the outerperipheral portion 28 of thedrive pulley 22. In acover 252 shown inFig. 5 ,slots 260 have a bent shape so that outer openingportions 264 have a larger area. In acover 352 shown inFig. 6 , the curve direction ofslots 360 is opposite to that in thecover 52 shown inFig. 1 . Acover 452 shown inFig. 7 has rectilinear long slots 460-1 and short slots 460-2 arranged alternately in the circumferential direction. The shapes and layouts of the above-described slots and inner and outer opening portions are shown merely for exemplary purposes and may be changed to other configurations. - Although some embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, although in the foregoing embodiments the outside air is sucked from the inner opening portions and discharged from the outer opening portions, the air may be made to flow reversely by reversing the rotational direction of the drive pulley or by reversing the direction of the blades of the fan. In other words, the arrangement may be as follows. The outside air is sucked into the accommodating space from the outer opening portions to pass through outside the outer peripheral portion of the drive pulley. The air turns around the other side end edge of the outer peripheral portion and passes through the through-holes in the connecting portion and through inside the outer peripheral portion and is discharged to the outside of the accommodating space from the inner opening portions. Further, it is desirable to include both the configuration in which the air sucked into the accommodating space is blown directly over the outer peripheral portion of the drive pulley and the configuration in which the air flows along the airflow path passing through inside and outside the outer peripheral portion. It is, however, not always necessary to include both the configurations, but the belt-type grinding tool may include only either of the configurations. Such an arrangement still makes it possible to obtain a cooling effect sufficiently superior to that of the conventional technique. Further, it is possible to change the number of blades of the fan and the number of through-holes in the connecting portion. Although the foregoing embodiments show an electric motor-driven belt-type grinding tool including an electric motor, the present invention is also applicable to a pneumatic belt-type grinding tool employing an air motor in place of the electric motor.
-
- 10: belt-type grinding tool
- 12: tool body
- 14: distal end portion
- 16: idle pulley
- 18: electric motor
- 20: rotating shaft
- 20a: end face
- 22: drive pulley
- 24: endless grinding belt
- 24a: inner peripheral surface
- 25: shoe
- 26: center secured portion
- 28: outer peripheral portion
- 28a: side end edge
- 28b: side end edge
- 28c: inner peripheral surface
- 30: connecting portion
- 32: hexagon nut
- 34: flange portions
- 36: fan
- 38: center secured portion
- 38a: inner peripheral surface
- 40: blades
- 42: securing screw
- 42a: end face
- 44: O-ring
- 46: through-holes
- 48: gap
- 50: securing screw
- 52: cover
- 54: secured portion
- 56: cover plate portion
- 58: accommodating space
- 58a: inner peripheral surface
- 58b: forward portion
- 58c: lower portion
- 60: slots
- 62: inner opening portions
- 64: outer opening portions
- 66: arrow-shaped hole
- 68: airflow paths
- 152: cover
- 162: inner opening portions
- 164: outer opening portions
- 252: cover
- 260: slots
- 264: outer opening portions
- 352: cover
- 360: slots
- 452: cover
- 460-1: long slots
- 460-2: short slots
- L: longitudinal axis
- R: rotation axis
Claims (7)
- A belt-type grinding tool (10) comprising:a tool body (12) including a motor;an idle pulley (16) rotatably attached to the tool body (12);a drive pulley (22) to be rotatably driven by the motor and having a cylindrical outer peripheral portion (28) configured to support an endless grinding belt (24) wound between the drive pulley (22) and the idle pulley (16);a fan (36) at least partially disposed radially inside the outer peripheral portion (28), the fan (36) being configured to rotate together with the drive pulley (22) to generate a flow of air passing through inside the outer peripheral portion (28) in a direction of a rotation axis of the drive pulley (22);a cover (52) having a cover plate portion (56) disposed adjacent to one side end edge (28a, 28b) of the outer peripheral portion (28) in the direction of the rotation axis, the cover (52) defining between itself and the tool body (12) an accommodating space (58) accommodating the drive pulley (22), the cover plate portion (56) having an inner opening portion (62) and an outer opening portion (64), the inner opening portion (62) opening into the accommodating space (58) at a position radially inward of an inner peripheral surface (58a) of the outer peripheral portion (28), and the outer opening portion (64) opening into the accommodating space (58) at a position radially outward of the inner peripheral surface (58a) of the outer peripheral portion (28); andan airflow path (68) provided in the accommodating space (58), the airflow path (68) extending from the inner opening portion (62) to pass through inside the outer peripheral portion (28) and turning around an other side end edge (28a, 28b) of the outer peripheral portion (28) to pass through outside the outer peripheral portion (28) to reach the outer opening portion (64);wherein the airflow path (68) is configured such that, when the fan (36) is rotated, outside air is sucked into the accommodating space (58) from one of the inner opening portion (62) and the outer opening portion (64) to flow along the airflow path (68) and discharged to an outside of the accommodating space (58) from the other of the inner opening portion (62) and the outer opening portion (64).
- The belt-type grinding tool (10) of claim 1, wherein the cover (52) plate portion has a slot (60) extending from a position radially inward of the inner peripheral surface (58a) of the outer peripheral portion (28) to a position radially outward of the inner peripheral surface (58a) of the outer peripheral portion (28), the inner opening portion (62) and the outer opening portion (64) each being formed as a part of the slot (60).
- The belt-type grinding tool (10) of claim 2, wherein the slot (60) is curved with respect to a radial direction about the rotation axis.
- The belt-type grinding tool (10) of any one of claims 1 to 3, wherein the drive pulley (22) further includes a center secured portion (26) connected to a rotating shaft (20) drivably connected to the motor, and a connecting portion (30) extending from the outer peripheral portion (28) to the center secured portion (26), the connecting portion (30) having a through-hole (46) extending therethrough in the direction of the rotation axis, wherein the airflow path (68) is configured to pass through the through-hole (46).
- The belt-type grinding tool (10) of claim 4, wherein when the fan (36) is rotated, outside air is sucked into the accommodating space (58) from the inner opening portion (62) to flow along the airflow path (68) such that the air passes through inside the outer peripheral portion (28), passes through the through-hole (46), turns around the other side end edge (28a, 28b) of the outer peripheral portion (28), passes through outside the outer peripheral portion (28), and is discharged to the outside of the accommodating space (58) from the outer opening portion (64).
- The belt-type grinding tool (10) of claim 4 or 5, wherein the fan (36) has a plurality of blades (40) arranged at a first space in a circumferential direction of the outer peripheral portion (28), and the through-hole (46) includes a plurality of the through-holes (46) arranged in the circumferential direction at a second space, the first space and the second space are different from one another.
- The belt-type grinding tool (10) of any one of claims 4 to 6, wherein a gap (48) in the direction of the rotation axis is formed between the fan (36) and the connecting portion (30) of the drive pulley (22).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018086634 | 2018-04-27 | ||
PCT/JP2019/013541 WO2019208086A1 (en) | 2018-04-27 | 2019-03-28 | Belt type grinding tool |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3785848A1 EP3785848A1 (en) | 2021-03-03 |
EP3785848A4 EP3785848A4 (en) | 2022-01-19 |
EP3785848B1 true EP3785848B1 (en) | 2023-07-26 |
Family
ID=68293977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19792609.0A Active EP3785848B1 (en) | 2018-04-27 | 2019-03-28 | Belt type grinding tool |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3785848B1 (en) |
JP (1) | JP6781844B2 (en) |
KR (1) | KR102237638B1 (en) |
CN (1) | CN112004639B (en) |
TW (1) | TWI687279B (en) |
WO (1) | WO2019208086A1 (en) |
Family Cites Families (22)
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US4195449A (en) * | 1976-04-06 | 1980-04-01 | Annamaria Scarpa | Portable cutting-tool sharpener |
JPS55115758U (en) * | 1980-02-08 | 1980-08-15 | ||
JPH0613827Y2 (en) * | 1986-08-08 | 1994-04-13 | 株式会社マキタ | Belt sanda |
CN2032924U (en) * | 1988-03-05 | 1989-02-22 | 重庆大学 | Hand abrader for abrasive belt |
JPH0613827A (en) | 1992-06-29 | 1994-01-21 | Toshiba Corp | Signal compession/expansion switching circuit |
JPH0613827U (en) | 1992-07-23 | 1994-02-22 | 勝馬 廣 | box |
JP3711095B2 (en) * | 2002-07-30 | 2005-10-26 | 日東工器株式会社 | Belt grinding tool |
TW557045U (en) * | 2002-10-17 | 2003-10-01 | Taiwan Yamamoto Electric Ind C | Motor having cooling fan |
JP3910944B2 (en) * | 2003-07-08 | 2007-04-25 | 日東工器株式会社 | Hand-held endless belt-driven cutting tool |
US7338348B2 (en) * | 2003-08-29 | 2008-03-04 | Black & Decker Inc. | Dust collection system for a belt sander |
TWM278509U (en) * | 2005-05-24 | 2005-10-21 | Ruei-Sen Liau | Grinding machine |
JP2008207295A (en) * | 2007-02-27 | 2008-09-11 | Hitachi Koki Co Ltd | Power tool |
CN100479991C (en) * | 2007-10-10 | 2009-04-22 | 苏州协成模具科技有限公司 | Hand-held grinding polishing machine air-cooled structure |
TWM353065U (en) * | 2008-10-31 | 2009-03-21 | Colovos Company | Structural improvement for eliminating debris and collecting dust from sand grinder |
JP5303600B2 (en) * | 2011-04-08 | 2013-10-02 | リョービ株式会社 | Handheld belt sander |
JP6200660B2 (en) * | 2013-02-28 | 2017-09-20 | 日東工器株式会社 | Belt grinding tool |
TWI571354B (en) * | 2015-02-05 | 2017-02-21 | X`Pole Prec Tools Inc | Improve the heat efficiency of the electric grinding hand tools |
US9505119B2 (en) * | 2015-02-19 | 2016-11-29 | X'pole Precision Tools Inc. | Electric handheld sanding tool providing improved cooling efficiency |
JP6382143B2 (en) * | 2015-03-31 | 2018-08-29 | 日東工器株式会社 | Pneumatic tool with Helmholtz silencer |
GB2562436B (en) * | 2016-03-11 | 2021-02-24 | Nitto Kohki Co | Belt-type grinding tool |
CN107745312B (en) * | 2016-06-28 | 2020-08-14 | 苏州宝时得电动工具有限公司 | Sander, operation method thereof and disassembly and assembly method of working bottom plate |
CN107584383B (en) * | 2017-10-20 | 2019-08-23 | 蔡雅婷 | A kind of transmission line of electricity handheld power steel tower corner iron sander |
-
2019
- 2019-03-28 KR KR1020207029689A patent/KR102237638B1/en active IP Right Grant
- 2019-03-28 CN CN201980025338.3A patent/CN112004639B/en active Active
- 2019-03-28 EP EP19792609.0A patent/EP3785848B1/en active Active
- 2019-03-28 JP JP2019537001A patent/JP6781844B2/en active Active
- 2019-03-28 WO PCT/JP2019/013541 patent/WO2019208086A1/en active Application Filing
- 2019-04-10 TW TW108112449A patent/TWI687279B/en active
Also Published As
Publication number | Publication date |
---|---|
EP3785848A4 (en) | 2022-01-19 |
JP6781844B2 (en) | 2020-11-04 |
CN112004639A (en) | 2020-11-27 |
CN112004639B (en) | 2022-05-27 |
WO2019208086A1 (en) | 2019-10-31 |
EP3785848A1 (en) | 2021-03-03 |
KR102237638B1 (en) | 2021-04-07 |
JPWO2019208086A1 (en) | 2020-04-30 |
KR20200122408A (en) | 2020-10-27 |
TWI687279B (en) | 2020-03-11 |
TW202003152A (en) | 2020-01-16 |
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