JP2011073097A - Grinder protective cover, grinder protective cover unit and grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinder protective cover, a grinder protective cover unit and a grinder, allowing the position of a blade tool and the processing state of a processing object member to be confirmed by visual observation, without causing melting damage by a spark. <P>SOLUTION: This grinder protective cover 10 includes a first transparent resin wall part 11 forming a substantially disk shape and a second transparent resin wall part 12 forming a substantially cylindrical shape. A protective plate 48 is arranged in a part opposed to an inner surface 12A of a front part of the second wall part 12. The protective plate 48 is made of fire resistant metal having a thickness of about 1-2 mm, and is formed in a circular arc shape of a semicircle as a whole by curving a plate-like metallic plate of forming a slender and substantially rectangular shape. A cover engaging part 48A of the protective plate 48 is energized by a spring 13A in an engaging groove 13a, and the protective plate 48 can project downward more than the lower edge 12A of the grinder protective cover 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a protective cover for a grinder, a protective cover unit for a grinder, and a grinder, and in particular, a protective cover for a grinder, a protective cover unit for a grinder, and the like that are attached to a grinder that generates sparks when a cutting tool comes into contact with a workpiece. It relates to the grinder to be installed.

  2. Description of the Related Art Conventionally, a grinder for processing the surface of a workpiece by rotating a substantially disc-shaped cutting tool is known. The grinder includes a housing that accommodates the motor, a rotating shaft portion that is drivingly connected to the rotating shaft of the motor, and a cutting tool that is rotatably provided integrally with the rotating shaft portion. The housing is configured to be located on one surface side of the cutting tool, and a part of the other surface with respect to the one surface of the cutting tool can be in contact with the workpiece and the workpiece can be processed. The housing is provided with a protective cover that covers one surface of the blade and the peripheral surface of the blade. Such a grinder is described in, for example, Japanese Patent Application Laid-Open No. 2008-049469 (Patent Document 1).

JP 2008-049469 A

  During an operation of grinding a workpiece made of metal such as stainless steel, a spark is generated when the cutting tool comes into contact with the workpiece. However, as shown in FIG. 11 or 12, the protective covers 110 and 210 of the conventional grinders 101 and 102 generally cover only about half of the outer periphery of the cutting tools 150 and 250. , 210 causes a problem that the spark F diffuses to the outside of the protective covers 110, 210 from the portions of the blades 150, 250 that are not covered by the 210. For this reason, the worker has to work while paying attention to dirt due to the spark F, cleaning of the spark F after the work, and the like.

  In addition, when the entire circumference of the cutting tool is covered with a protective cover made of a transparent resin, the protective cover is melted by a hot spark so that the position of the cutting tool and the processing state of the workpiece can be visually confirmed. To lose.

  Therefore, an object of the present invention is to provide a grinder protective cover, a grinder protective cover unit, and a grinder that are not melted by a spark and can visually confirm the position of the cutting tool and the processed state of the workpiece.

  In order to achieve the above object, the present invention provides a grinder body, a rotating shaft that is rotatably supported by the grinder body and protrudes from the grinder body, and is mounted on the rotating shaft portion coaxially with the rotating shaft portion. A protective cover for the grinder that is supported by the grinder body of the grinder including the disc-shaped blade tool and protects the blade tool, and is located on the base side of the rotating shaft and faces one surface of the blade tool. A first wall portion and one end portion in the axial direction of the rotary shaft portion are connected to the first wall portion, and are arranged to face a peripheral edge portion in the radial direction of the blade tool, and are opposed to the peripheral edge of the blade tool. A protective cover for a grinder provided with a protective plate made of a refractory material on at least a part of the inner surface of the second wall in the circumferential direction of the cutting tool. is doing.

  Since a protective plate made of a fire-resistant material is disposed on at least a part of the inner surface of the second wall portion in the circumferential direction of the cutting tool, the grinder protective cover is made of a material such as a transparent resin. However, the grinder protective cover can be prevented from being melted. Therefore, the visibility of the blade and the part of the workpiece processed by the blade through the grinder protective cover is ensured, and the spark generated from the part of the workpiece processed by the blade is used for the grinder. It is possible to prevent the protective cover from spreading outward.

  Here, the protection plate protrudes in a direction away from the first wall portion from the other end edge of the second wall portion at least in a state where the workpiece is not in contact with the protection plate. preferable. Since the protection plate protrudes in a direction away from the first wall portion from the other end edge of the second wall portion at least in a state where the workpiece is not in contact with the protection plate, the protection member is processed. Even when the other end edge with respect to the one end portion of the second wall portion in the axial direction of the rotating shaft portion is separated from the surface of the workpiece, the protective plate is always in the axial direction of the rotating shaft portion. Projects toward the workpiece from the other edge to the one end of the two walls, can always follow the surface of the workpiece, and always keeps the protective plate in contact with the workpiece surface can do.

  In addition, the protective plate can project in a direction away from the first wall portion from the other end edge of the second wall portion in the axial direction of the rotation shaft portion, and in a direction away from the first wall portion. It is preferable that a plate urging member for urging the protective plate is provided.

  The protection plate can project in a direction away from the first wall portion than the other end edge of the second wall portion in the axial direction of the rotation shaft portion, and urge the protection plate in a direction away from the first wall portion. Since the urging member is provided, the other end edge of the second wall portion with respect to the one end portion in the axial direction of the rotating shaft portion is separated from the surface of the processed member when the processed member is processed. However, the protective plate can protrude from the other end edge with respect to the one end portion of the second wall portion in the axial direction of the rotating shaft portion toward the member to be processed, and can follow the surface of the member to be processed. It is possible to maintain the state in contact with the surface of the processed member. For this reason, even if it is a case where the other end edge of a 2nd wall part is spaced apart from the surface of a to-be-processed member, it can prevent that a spark diffuses outside the protective cover for grinders.

  The first wall portion is substantially plate-shaped, and at least a part of the other end edge of the second wall portion in the axial direction of the rotation shaft portion is located on the same virtual plane, The surface preferably intersects the virtual plane at a predetermined angle.

  The first wall portion is substantially plate-shaped, and at least a part of the other end edge of the second wall portion in the axial direction of the rotating shaft portion is located on the same virtual plane, and the surface of the first wall portion is Since it intersects with the virtual plane at a predetermined angle, the surface of the member to be processed can be processed with the rotating shaft portion inclined, and the working efficiency can be improved.

  The inner surface of the second wall portion defines an inner space of the cover, and is connected to an outer surface with respect to the inner surface of the second wall portion, and a cylindrical member that defines an inner space of the cylindrical member that communicates with the inner space of the cover. It is preferable that the cylindrical member is made of a refractory material.

  The inner surface of the second wall portion defines an inner space of the cover, is connected to an outer surface of the inner surface of the second wall portion, and includes a cylindrical member that defines an inner space of the cylindrical member that communicates with the inner space of the cover. It can collect in a cylindrical member. Furthermore, since the cylindrical member is made of a refractory material, the cylindrical member can be prevented from being melted by sparks.

  The cylindrical member is preferably bent at a substantially central portion in the longitudinal direction of the cylindrical member. Since the cylindrical member is bent at a substantially central portion in the longitudinal direction of the cylindrical member, the spark collected in the cylindrical member moves beyond the bent portion of the cylindrical member in the cylindrical member. Can be difficult. For this reason, it is possible to prevent the spark collected in the cylindrical member from returning to the space in the cover due to vibration caused by driving of the grinder.

  It is preferable that a mesh plate for closing the inside of the cylindrical member is provided on the cylindrical member so as to be detachable from the cylindrical member. Since the mesh member that closes the inside of the tubular member is detachably attached to the tubular member, the air that has flowed from the cover inner space to the tubular member inner space passes through the mesh plate. It is possible to flow out of the space inside the cylindrical member, and the flow of air can be made smooth, whereby more sparks can be collected in the cylindrical member.

  The present invention also includes a grinder body, a rotating shaft portion rotatably supported on the grinder body and protruding from the grinder body, and a disc-like shape mounted on the rotating shaft portion coaxially with the rotating shaft portion. A grinder protective cover unit that is supported by the grinder body of the grinder including the blade and protects the blade, and is positioned on the base side of the rotary shaft portion and facing a first surface of the blade. The second end portion of the rotary shaft portion is connected to the first wall portion, is disposed opposite to the peripheral edge portion in the radial direction of the cutting tool, and has a second wall portion inner surface facing the peripheral edge of the cutting tool. A wall, and a protective plate that is disposed on at least a part of the inner surface of the second wall in the circumferential direction of the blade and is made of a fire-resistant material, the second wall in the axial direction of the rotating shaft At least part of the other edge of the The imaginary plane is accessible to the other surface of the cutting tool by interposing between the grinder protective cover located on the plane, the adapter connected to the grinder body, and the adapter and the grinder protective cover. Alternatively, a grinder protective cover unit is provided that includes an elastic body that supports the grinder protective cover so as to be separated.

  A first wall portion that is located on the base side of the rotating shaft portion and faces one surface of the cutting tool, and one end portion in the axial direction of the rotating shaft portion is connected to the first wall portion, and is arranged to face the peripheral portion in the radial direction of the cutting tool. A second wall portion having an inner surface of the second wall portion facing the peripheral edge of the blade, and a protective plate made of a fire-resistant material disposed on at least a part of the inner surface of the second wall portion in the circumferential direction of the blade. A grinder protective cover in which at least a part of the other end edge of the second wall portion in the axial direction of the rotation shaft portion is located on the same virtual plane, an adapter connected to the grinder body, and an adapter and a grinder protective cover And an elastic body that supports the grinder protective cover so that the virtual plane can be approached or separated from the other surface with respect to the one surface of the blade, so that the other surface of the blade is the surface of the workpiece In contact with When doing, even when the position of the grinder body is slightly changed, it is possible to the other end edge of the second wall portion is maintained to follow the surface of the workpiece. For this reason, it can prevent that a clearance gap produces between the other end edge of a 2nd wall part, and the surface of a to-be-processed member, and can prevent that a spark spreads out of the protective cover for gliders.

  Moreover, this invention provides the grinder provided with the said protective cover for grinders, or provided with the said protective cover unit for grinders.

  As described above, the present invention can provide a grinder protective cover, a grinder protective cover unit, and a grinder that are not melted by sparks and can visually confirm the position of the cutting tool and the processed state of the workpiece.

The schematic plan view which shows the grinder with which the protective cover for grinders by embodiment of this invention was mounted | worn. The disassembled fragmentary sectional view which shows the protective cover for grinders and grinder by embodiment of this invention. The schematic fragmentary sectional view which shows the grinder with which the protective cover for grinders by embodiment of this invention was mounted | worn. The perspective view which shows the protective plate of the protective cover for grinders by embodiment of this invention. The perspective view which shows a mode that the center engaging part of the protection plate of the protective cover for grinders by embodiment of this invention is engaged with an L-shaped convex part. The disassembled side view which shows the part of the cover engaging part of the protective plate of the protective cover for grinders by embodiment of this invention. The disassembled side view which shows a mode that the protective plate of the protective cover for grinders by embodiment of this invention protrudes from the protective cover for grinders. The disassembled side view which shows the cylindrical part and mesh plate of the protective cover for grinders by embodiment of this invention. The schematic plan view which shows the modification by which the dust collector was mounted | worn with the protective cover for grinders by embodiment of this invention. The schematic plan view which shows the modification by which the dust bag was mounted | worn with the protective cover for grinders by embodiment of this invention. The schematic plan view which shows a mode that the to-be-processed member is processed with the grinder with which the conventional protective cover for grinders was mounted | worn. The schematic side view which shows a mode that the to-be-processed member is processed with the grinder with which the conventional protective cover for grinders was mounted | worn.

  A grinder and a protective cover for a grinder according to an embodiment of the present invention will be described with reference to FIGS. More specifically, the grinder 1 is a disc grinder, and as shown in FIG. 1, a housing 40 that houses and fixes a motor and a fan (not shown) inside, and a cutting tool that is a grindstone provided at an end of the housing 40. 50. The housing 40 corresponds to the grinder body.

  Here, for convenience of explanation, the left direction of the grinder 1 in FIG. 1 is defined as the front direction, the right direction is defined as the rear direction, the upper direction is defined as the right direction, and the lower direction is defined as the left direction. Further, a direction from the back side to the front side of the paper surface of FIG. 1 is defined as an upward direction, and a direction from the front side to the back side of the paper surface is defined as a downward direction. Further, the housing 40 is schematically shown for convenience of explanation.

  A front end portion of the housing 40 has a gear cover 41, and a gear mechanism (not shown) is provided in the gear cover 41. A gear mechanism (not shown) is drivingly connected to an output shaft of a motor (not shown). A gear mechanism (not shown) is rotatably connected to the housing 40 and is drivingly connected to a rotating shaft portion 42 that protrudes downward from the housing 40.

  A cutting tool 50 is fixed to a portion near the lower end of the rotating shaft portion 42 through a blade holding member 43 described later in a coaxial positional relationship with the rotating shaft portion 42. The cutting tool 50 has a substantially disk shape with a through hole 50a (FIG. 3) formed in the center. More specifically, the cutting tool 50 has a truncated cone shape whose axis is the center of the cutting tool 50. The axis coincides with the axis of the rotary shaft 42, and the top side of the truncated cone is the rotary shaft. The bottom surface side is located on the upper side, which is the base side of the rotating shaft portion 42.

  The upper surface of the cutting tool 50 is fixed to the cutting tool holding member 43 in a coaxial positional relationship with the substantially disk-shaped cutting tool holding member 43. The blade holding member 43 is fixed to the rotating shaft 42 in a state of being coaxial with the rotating shaft 42 while being sandwiched between the wheel washer 44 and the wheel nut 45 in the vertical direction. With this configuration, when the output shaft of a motor (not shown) rotates, the rotation of the output shaft is transmitted to the rotary shaft portion 42 via a gear mechanism (not shown), and the blade holding member 43 and the blade 50 are clockwise in FIG. It is configured to rotate.

  Further, a plate-like member 46, an adapter 47, and a grinder protective cover 10 are mounted on the gear cover 41 of the housing 40. The plate-like member 46 has an upper surface opposed to the lower end of the gear cover 41, a through hole 46 a is formed at the center thereof, and the rotary shaft portion 42 passes through the through hole 46 a. A plurality of screw holes 46 b for screwing screws 17 described later are formed in the vicinity of the periphery of the plate-like member 46.

  The adapter 47 has an upper surface opposed to the lower surface of the plate-like member 46, a through hole 47 a is formed at the center, and the rotary shaft portion 42 passes through the through hole 47 a. A portion of the lower surface of the adapter 47 in the vicinity of the periphery of the adapter 47 forms a spring contact portion 47A with which an upper end of a spring 16 described later contacts. The adapter 47 is fixed to the gear cover 41 by screws 47B.

  The grinder protection cover 10 has a substantially disk-shaped transparent resin first wall portion 11 and a substantially cylindrical-shaped transparent resin second wall portion 12. A through hole 11a is formed in the central portion of the first wall portion 11, and the rotating shaft portion 42 passes through the through hole 11a.

  When the grinder protection cover 10 is attached to the gear cover 41 of the housing 40 as shown in FIG. 3, the first wall portion 11 is disposed at a position closer to the base portion of the rotating shaft portion 42 than the cutting tool 50. And faces the upper surface of the blade 50 through the blade holding member 43. The upper surface and the lower surface of the first wall portion 11 are orthogonal to the axial direction of the rotation shaft portion 42.

  In the vicinity of the peripheral edge portion of the upper surface of the first wall portion 11, a cylindrical portion 11 </ b> A that can be engaged with a tip portion of a screw 17 described later is provided. Further, the upper surface of the first wall portion 11, which protrudes upward in the radially inner portion of the first wall portion 11 from the cylindrical portion 11 </ b> A, is defined by an inner peripheral surface of a spring 16 described later. A spring support protrusion 11B to be inserted into the space is provided.

  The cylindrical shape that forms the outer shape of the second wall portion 12 is such that the cylinder is cut by a virtual plane that intersects the axial direction of the cylinder at an angle other than 90 °. It is arranged on a plane. For this reason, the upper surface and the lower surface of the first wall portion 11 having a substantially disk shape intersect with the virtual plane at an angle of about 5 ° to 10 °, and the grinder protecting cover is formed on the surface of the workpiece to be a flat surface. When 10 is brought into contact, the second wall portion 12 is in a state where its axial direction is inclined forward by about 5 ° to 10 °. Since the surface of the member to be processed can be processed with the rotating shaft portion 42 tilted in this manner, the work efficiency can be improved.

  The upper end portion of the second wall portion 12 is integrally connected to the peripheral portion of the first wall portion 11, and the axial center of the second wall portion 12 has a positional relationship that coincides with the rotation shaft portion 42. The entire inner surface 12B of the second wall portion 12 has a positional relationship that can be opposed to the entire outer periphery 50A of the cutting tool 50. More specifically, the inner surface of the second wall portion 12 other than the portion provided with a protection plate 48 described later directly faces the outer periphery of the blade 50. A portion of the inner surface of the second wall portion 12 where a later-described protection plate 48 is provided faces the outer periphery of the blade 50 via the later-described protection plate 48. A space defined by being surrounded by the inner surface 12B of the second wall portion 12 and the lower surface of the first wall portion 11 forms an in-cover space 10a.

  Protection plate engaging portions 13 are respectively provided at the end portions of the second wall portion 12 in the left-right direction. The protective plate engaging portion 13 protrudes from the outer peripheral surface of the second wall portion 12, and an engaging groove 13a communicating with the cover inner space 10a is formed in the inside thereof. As shown in FIG. 6, a spring 13A is inserted into the engagement groove 13a. The upper end of the spring 13A is in contact with the upper part of the inner surface of the protective plate engaging portion 13 that defines the engaging groove 13a, and the lower end of the spring 13A is a cover member for a protective plate 48 to be described later inserted into the engaging groove 13a. The joint portion 48A is in contact. A locking member 13B is inserted into the engagement groove 13a to prevent the cover engagement portion 48A from coming off the engagement groove 13a by contacting a lower end of a cover engagement portion 48A described later. The spring 13A corresponds to a plate biasing member.

  A pair of L-shaped convex portions 13 </ b> C and 13 </ b> C project in parallel to the direction of the rotation shaft portion 42 on the inner surface of a portion of the front portion of the second wall portion 12 that is connected to the first wall portion 11. Is provided. As shown in FIG. 5, the tip portions of the L-shaped convex portions 13C and 13C are bent upward. Between the pair of L-shaped convex portions 13C and 13C, an upper extending portion 48C of a center engaging portion 48B of a protective plate 48 described later can be disposed, and bent into an L-shape of the L-shaped convex portions 13C and 13C. As shown in FIG. 5, the upper extending portion 48 </ b> C of the center engaging portion 48 </ b> B of the protective plate 48 described later is disposed on the inner surface between the pair of L-shaped convex portions 13 </ b> C, 13 </ b> C as described later. The left and right direction extending portion 48D of the central engaging portion 48B of the protective plate 48 can be placed.

  A protective plate 48 is provided at a portion facing the inner surface of the front portion of the second wall portion 12. The protective plate 48 is made of a metal having a fire resistance thickness of about 1 mm to 2 mm. As shown in FIG. 4 and the like, a plate-like metal plate having an elongated and substantially rectangular shape is curved to form a semicircle as a whole. The arc shape. 48 A of cover engaging parts are provided in the both ends of the longitudinal direction of the protection plate 48, respectively. 48 A of cover engaging parts protrude from the upper part of the both ends of the longitudinal direction of the protection plate 48 so that it may form a rectangular plate shape, and it mutually spaces apart from the engagement groove | channel 13a of the protection plate engagement part 13. Match.

  A central engaging portion 48B that protrudes upward is provided on the upper portion of the central portion of the protective plate 48 in the longitudinal direction. The central engaging portion 48B has an upward extending portion 48C extending upward and a laterally extending portion 48D extending in the left-right direction from the uppermost portion of the upward extending portion 48C, and has a substantially T shape. The upward extending portion 48C is disposed between the pair of L-shaped convex portions 13C and 13C, and is guided in the vertical direction between the L-shaped convex portions 13C and 13C.

  The cover engagement portion 48A of the protection plate 48 is biased by the spring 13A in the engagement groove 13a, and in this state, the cover engagement portion 48A of the protection plate 48 can move in the vertical direction in the engagement groove 13a. It is. Further, the upward extending portion 48C of the center engaging portion 48B is guided in the vertical direction between the L-shaped convex portions 13C and 13C. Thus, the protection plate 48 is supported by the grinder protection cover 10 so as to be vertically movable with respect to the grinder protection cover 10.

  In an initial state where the protection plate 48 is not in contact with the surface of the workpiece, the protection plate 48 is positioned at the lowest position and protrudes downward from the lower end edge 12A of the second wall portion 12. At this time, the spring 13A is in the most extended state. At this time, the cover engaging portion 48A is in contact with the locking member 13B in the engaging groove 13a, and the protective plate 48 is formed on the inner surface of the L-shaped convex portions 13C and 13C bent to the L shape. The left and right direction extending portion 48D of the central engaging portion 48B is placed.

  When the lower end of the protection plate 48 is brought into contact with the surface of the workpiece and the housing 40 is brought closer to the surface of the workpiece, the protection plate 48 moves upward with respect to the grinder protection cover 10 and the spring. 13A shrinks. When the spring 13A is in the most contracted state in the engagement groove 13a, the protection plate 48 is located at the uppermost position with respect to the grinder protection cover 10, and the protection plate 48 protrudes from the lower end of the second wall portion 12. No state.

  Thus, since the protection plate 48 can protrude from the lower end of the second wall portion 12 and the protection plate 48 protrudes from the lower end of the second wall portion 12 in the initial state, the member to be processed is When processing, as shown in FIG. 7, even when the lower end edge 12A of the second wall 12 is separated from the surface of the workpiece, the protective plate 48 always follows the surface of the workpiece. It is possible to maintain the state where the protective plate 48 is kept in contact with the surface of the workpiece. For this reason, even if it is a case where 12 A of lower end edges of the 2nd wall part 12 are spaced apart from the surface of a to-be-processed member, it can always prevent that a spark spreads out of the protective cover 10 for grinders.

  The protective cover 10 for the grinder is provided with a cylindrical duct portion 14 integrally with the second wall portion 12. As shown in FIG. 1, the duct portion 14 extends rearward from the right portion of the second wall portion 12 in the tangential direction of the second wall portion 12. A through hole (not shown) is formed in a portion of the second wall portion 12 where the duct portion 14 is provided, and the space inside the duct portion 14 and the space 10a in the cover communicate with each other.

  A metal cylindrical member 15 having fire resistance is detachably connected to the duct portion 14 at the extended end portion of the duct portion 14. As shown in FIG. 3, the tubular member 15 is bent downward toward the rear at the center in the longitudinal direction. A slit 15 is formed in the vicinity of the other end of the duct portion 14 as shown in FIG. A metal mesh plate 15A having a disk shape and fire resistance can be inserted into the slit 15a. By inserting the mesh plate 15A, the inside of the cylindrical member 15 can be closed in a state where air can flow between the inner space of the cylindrical member 15 and the outside of the cylindrical member 15 through the mesh plate 15A. it can. Further, by removing the mesh plate 15A, the space in the duct portion 14 is communicated from one end to the other end in the cylindrical member 15.

  A spring 16 is provided between the grinder protective cover 10 and the adapter 47 as shown in FIG. The spring 16 is arranged so as to wrap around the spring support protrusion 11B. The lower end of the spring 16 is in contact with the upper surface of the first wall portion 11, and the upper end is in contact with the spring contact portion 47 </ b> A of the adapter 47. Screws 17 are interposed between the plate-like member 46 and the grinder protective cover 10. The vicinity of the head portion of the screw 17 is screwed into the screw hole 46 b of the plate-like member 46, and the tip portion of the screw 17 can be inserted into the space in the cylindrical portion 11 </ b> A of the first wall portion 11. When the distal end portion of the screw 17 is inserted into the space in the cylindrical portion 11A and comes into contact with the bottom portion of the cylindrical portion 11A, the grinder protective cover 10 is in the positional relationship closest to the housing 40. When the distal end portion of the screw 17 is removed from the space in the cylindrical portion 11A, the virtual plane can approach or be separated from the lower surface of the blade 50 by the elastic force of the spring 16. The spring 16 corresponds to an elastic body.

  When the surface of the workpiece is machined by the cutting tool 50 of the grinder 1, first, the protective plate 48 protruding downward from the grinder protective cover 10 is placed on the surface of the workpiece against the biasing force of the spring 13A. The pressing is performed until the entire lower end edge 12A of the second wall portion 12 comes into contact with the surface of the workpiece. In this state, the housing 40 is pressed so as to approach the surface of the workpiece so that the blade 50 abuts on the surface of the workpiece, and the front portion of the lower surface of the blade 50 is pressed against the workpiece. Process by contacting the surface with the surface.

  At this time, the blade 50 is rotating clockwise in FIG. 1 with the rotation shaft portion 42 as the rotation shaft, and the spark generated by the contact between the front portion of the blade 50 and the surface of the workpiece is the front portion of the blade 50. In the tangential direction, that is, the front part of the blade 50 and scattered in the right direction.

  However, since the protective plate 48 is provided, the grinder protective cover 10 can be prevented from being melted even if the grinder protective cover 10 is made of a resin that can be seen through. For this reason, while ensuring the visibility through the protective cover 10 for grinders of the blade 50 and the part of the workpiece processed with the blade 50, it generate | occur | produces from the part of the workpiece processed with the blade 50. It is possible to prevent the spark from diffusing outside the protective cover 10 for the grinder.

  Moreover, since the cylindrical member 15 is provided, a spark can be collected in the cylindrical member 15. Furthermore, since the cylindrical member 15 is made of fireproof metal, the cylindrical member 15 can be prevented from being melted by sparks.

  In addition, since the cylindrical member 15 is bent at a substantially central portion in the longitudinal direction of the cylindrical member 15, the spark collected in the cylindrical member 15 is bent in the cylindrical member 15. It is possible to make it difficult to move beyond the part. For this reason, it is possible to prevent the spark collected in the cylindrical member 15 from returning to the cover inner space 10a due to vibrations caused by driving of the grinder 1 or the like.

  Further, the cylindrical member 15 is provided with a mesh plate 15 </ b> A that closes the inside of the cylindrical member 15 so as to be detachable from the cylindrical member 15. The air that has flown can flow out of the space inside the cylindrical member 15 through the mesh plate 15 </ b> A, and the flow of air can be made smooth, thereby collecting more sparks in the cylindrical member 15. be able to.

  Further, since the protective cover 10 for the grinder is connected to the housing 40 via the adapter 47 with the spring 16 interposed, when the other surface of the cutting tool 50 is in contact with the surface of the workpiece, the processing is performed. Even when the position of the housing 40 is slightly changed, the state in which the lower end edge 12A of the second wall portion 12 follows the surface of the workpiece can be maintained. For this reason, it can prevent that a clearance gap produces between 12 A of lower end edges of the 2nd wall part 12, and the surface of a to-be-processed member, and can prevent that a spark spreads outside the protective cover for gliders.

  The protective cover for grinder, the protective cover unit for grinder, and the grinder of the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, the tubular member 15 is connected to the duct portion 14, but is not limited to the tubular member 15. For example, when processing a workpiece that does not generate sparks, a hose 1015A of a dust collector 1015 may be connected as shown in FIG. 9, and a dust back 2015 may be connected as shown in FIG. You may connect.

  The grinder protective cover 10, the spring 16, the screw 17, and the adapter 47 may be used as a grinder protective cover unit.

  The protective cover for a grinder, the protective cover unit for a grinder, and the grinder of the present invention are particularly useful in the field of a grinder that generates sparks when a cutting tool comes into contact with a workpiece.

DESCRIPTION OF SYMBOLS 1 ... Grinder 10 ... Protective cover for grinders 10a ... Cover inner space 11 ... 1st wall part 12 ... 2nd wall part 12A ... Bottom edge 12B ... Inner surface 13A, 16 ... Spring 15 ... Cylindrical member 15A ... Mesh plate 40 ... Housing 41 ... Gear cover 42 ... Rotating shaft 47 ... Adapter 48 ... Protection plate 50 ... Cutting tool 50A ... outer circumference

Claims (9)

A grinder comprising: a grinder main body; a rotating shaft portion rotatably supported on the grinder main body and protruding from the grinder main body; and a disk-shaped cutting tool mounted on the rotating shaft portion coaxially with the rotating shaft portion. A protective cover for the grinder that is supported by the grinder body and protects the cutting tool,
A first wall portion that is located on the base side of the rotating shaft portion and faces one surface of the cutting tool, and one end portion in the axial direction of the rotating shaft portion are connected to the first wall portion, and the radial direction of the cutting tool is A second wall portion disposed opposite to the peripheral portion and having an inner surface of the second wall portion facing the peripheral edge of the blade,
A protective cover for a grinder, wherein a protective plate made of a fire-resistant material is disposed on at least a part of the inner surface of the second wall portion in the circumferential direction of the cutting tool.   The protection plate protrudes in a direction away from the first wall portion from the other end edge of the second wall portion at least in a state where a workpiece is not in contact with the protection plate. The protective cover for grinders according to claim 1. The protective plate can project in a direction away from the first wall portion from the other end edge of the second wall portion in the axial direction of the rotating shaft portion,
2. The protective cover for a grinder according to claim 1, further comprising a plate urging member that urges the protective plate in a direction away from the first wall portion. The first wall has a substantially plate shape,
At least a part of the other end edge of the second wall portion in the axial direction of the rotation shaft portion is located on the same virtual plane;
The grinder protective cover according to claim 1, wherein the surface of the first wall portion intersects the virtual plane at a predetermined angle. The inner surface of the second wall portion defines a space in the cover,
A cylindrical member connected to an outer surface of the second wall portion with respect to the inner surface and defining a cylindrical member inner space communicating with the cover inner space;
2. The protective cover for a grinder according to claim 1, wherein the cylindrical member is made of a refractory material.   6. The protective cover for a grinder according to claim 5, wherein the cylindrical member is bent at a substantially central portion in the longitudinal direction of the cylindrical member.   7. The grinder protective cover according to claim 6, wherein a mesh plate for closing the inside of the tubular member is detachably provided on the tubular member. A grinder comprising: a grinder main body; a rotating shaft portion rotatably supported on the grinder main body and protruding from the grinder main body; and a disk-shaped cutting tool mounted on the rotating shaft portion coaxially with the rotating shaft portion. A grinder protective cover unit that is supported by the grinder body and protects the cutting tool,
A first wall portion that is located on the base side of the rotating shaft portion and faces one surface of the cutting tool, and one end portion in the axial direction of the rotating shaft portion are connected to the first wall portion, and the radial direction of the cutting tool is A second wall portion having a second wall inner surface opposed to the peripheral edge and facing the peripheral edge of the blade, and disposed on at least a part of the inner surface of the second wall portion in the circumferential direction of the blade. A protective plate made of a material, and a grinder protective cover in which at least a part of the other end edge of the second wall portion in the axial direction of the rotating shaft portion is located on the same virtual plane;
An adapter connected to the grinder body;
An elastic body that is interposed between the adapter and the protective cover for the grinder and supports the grinder protective cover so that the virtual plane can be approached or separated from the other surface with respect to one surface of the cutting tool. A protective cover unit for grinders.   A grinder comprising the grinder protective cover according to any one of claims 1 to 7, or the grinder protective cover unit according to claim 8.

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