JP5033784B2 - Spatter prevention cover - Google Patents

Description

  The present invention relates to a cover for preventing cutting powder or grinding powder generated by cutting or grinding (referred to as “cutting” together) from scattering. More specifically, the present invention relates to a scattering prevention cover that is attached to a power machine such as an impact wrench or a disk sander and is applied to a tool member that surface-treats a fracture surface or a cut surface of a columnar element such as a bolt.

  Conventionally, high-strength TC bolts (simply referred to as “bolts”) have been used for fastening steel sheets in the fields of bridges, buildings, harbor structures, and the like. This high-strength TC bolt is designed to introduce a predetermined axial force by breaking the pin tail formed at the front end of the bolt by torque shear during tightening. It is also commonly used because of its work efficiency.

  This type of bolt is likely to generate a burr (tail burr) in which the bolt steel material becomes sharp after breaking. Therefore, although the anticorrosive paint is applied to the bolt after the breakage, the anticorrosive paint does not sufficiently adhere to the burr portion of the bolt, and this results in allowing early rusting from this part. Conventionally, in consideration of these circumstances, burrs have been appropriately removed.

  Since there is no original specialized tool for removing burrs, the burrs are generally removed by applying a normal disc sander to the tip of the bolt. However, in this method, since the burrs are small with respect to the disk of the disk sander, the work efficiency is extremely poor. Also, when working with a disk sander, the members may be damaged by coming into contact with members other than the target bolts. It was possible to fly and there was a safety problem. Furthermore, although the chips are scattered over a wide range, the remaining chips cause rusting unless cleaning work such as collecting or removing the scattered chips is performed reliably. Furthermore, the resinoid grindstone used for the disk sander has a problem that a lot of sparks, odors and grindstone scraps are generated, and the working environment is deteriorated.

  Therefore, the applicant of the present application has developed a socket that can efficiently process the fracture surface of a bolt (see Patent Document 1). This socket is attached to a power machine such as an impact wrench or disc sander, and is a socket for surface-treating the fracture surface of the bolt. A tool member that rotates around the axis by the drive shaft of the power machine cuts or grinds the fracture surface of the bolt. By doing so, sharp irregularities such as burrs generated on the fracture surface of the bolt are eliminated.

  The socket is additionally provided with a cylindrical member that is attached to a tool member or a non-rotating portion of the power machine (for example, a ring provided in the power machine main body coaxially with the drive shaft) and covers the tool member. The generated chips are blocked by the cylindrical member and accumulated in the cylindrical member, and the chips are prevented from scattering around.

JP 2008-132596 A

  Moreover, in order to collect | recover the chips in a cylindrical member efficiently, the said socket is providing the magnet in the internal peripheral surface of the cylindrical member. Thereby, by removing the socket after finishing the surface treatment, it is possible to omit the cleaning work such as collecting or removing chips coming out from the socket, and the work efficiency can be improved.

  However, depending on the situation on the magnet side such as the shape, size, magnetic force, and arrangement of the magnet, or the situation on the chip side such as the shape and size of the chip, the magnet may not be able to attract all the chips. In some cases, some of the chips fall down in the cylindrical member. Then, after removing the socket after finishing the surface treatment, it is necessary to perform a cleaning operation such as collecting or removing the fallen chips.

  In order to eliminate this, there is also a concept of connecting vacuum (chip dust cleaner) to the cylindrical member, surface-treating the broken surface of the bolt, sucking the inside of the cylindrical member and discharging the chip to the outside In some cases, the structure becomes complicated, which is expensive, and there is a risk that a dust explosion may occur in the dust collecting vacuum cleaner. In addition, when an operator carries or carries a chip dust collecting cleaner, a burden is placed on the operator and workability may be reduced.

  Then, this invention is made | formed in view of the said problem, and makes it a subject to provide the cover for scattering prevention which can prevent scattering of a chip | tip and can collect | recover chips with a very simple structure. It is.

  A scattering prevention cover according to the present invention is configured to solve the above-described problems, and is used for a tool member that rotates around a shaft by a drive shaft of a power machine to surface-treat a fracture surface of a columnar element such as a bolt. An anti-scattering cover comprising a cylindrical upper cover that is attached to a power machine and covers a tool member, and a lower cover that covers a columnar element, and the lower cover has two internal spaces by a partition having a through hole. The upper cover can be inserted into one space from the tip end side, and the fracture surface of the columnar element protrudes from the other space through the through hole into one space. It is characterized by that.

  According to such a configuration, the chips are prevented from being scattered around by the partition portions of the upper cover and the lower cover, and the chips are prevented from falling down by the partition portion of the lower cover. All the chips accumulate in one space of the lower cover, and the lower cover is removed from the columnar element to collect the chips. For this reason, after removing the scattering prevention cover after the surface treatment, a cleaning operation such as collecting or removing the fallen chips becomes unnecessary.

Further, in the scattering prevention cover according to the present invention, the lower cover includes a case-shaped first main body and a cylindrical second main body attached below the first main body. A cylindrical peripheral surface portion, a top surface portion that closes one end of the peripheral surface portion and forms a through hole, and a bottom surface portion that closes the other end opening of the peripheral surface portion and forms a through hole, and the bottom surface portion The structure made into the said partition part is employable.
In the anti-scattering cover according to the present invention, when the columnar element is a bolt, the other space is also a space for accommodating a nut screwed into the bolt.

  Further, the scattering prevention cover according to the present invention is a polygonal shape in which the lower cover is extrapolated or fitted to a nut so that the center of the columnar bolt is aligned with or eccentric from the rotation center of the tool member in the other space. The structure provided with the positioning part which has this through-hole can be employ | adopted.

  In addition, the scattering prevention cover according to the present invention can employ a configuration in which sealing means for eliminating a gap with the columnar element is provided on the inner peripheral surface of the through hole of the partition portion.

  In the scattering prevention cover according to the present invention, the lower cover includes a lid portion that closes one of the spaces, and the upper cover is configured to be fitted into a through hole formed in the lid portion from the tip end side. Is preferred. According to such a configuration, one space of the lower cover becomes a closed space during processing, so that the chips can be confined in the space.

  In that case, it is preferable that the cover for preventing scattering according to the present invention adopts a configuration in which the lid portion is removable.

  In the anti-scatter cover according to the present invention, the through-hole of the lid portion is formed with the center set at a position eccentric from the center of the through-hole of the partitioning portion in the direction orthogonal to the central axis of the columnar element. Can be adopted.

  As described above, the present invention can prevent scattering of chips and collect chips with an extremely simple structure. For this reason, it can be made very compact.

  The scattering prevention cover according to this embodiment is technically closely related to the socket according to Patent Document 1 previously developed by the applicant of the present application. Therefore, before describing the scattering prevention cover according to the present embodiment, first, the disclosure of Patent Document 1 will be described as a reference.

<Reference example>
As shown in FIGS. 1 to 4, the socket 10 includes a substantially cylindrical tool member 12 as a whole. Further, a screw hole 14 is formed at one end (base end) in the axial direction of the tool member 12, and the drive shaft 18 of the power machine 16 (see FIGS. 5 to 7) is screwed into the screw hole 14. It has become.

  On the other hand, a cutting blade 20 is formed at the other axial end portion (tip portion) of the tool member 12. This cutting blade 20 is comprised by the recessed part 22 formed in curved shape. Then, when the tool member 12 rotates around the axis, the recess 22 comes into contact with the fracture surface 46 of the bolt (columnar element as the object to be processed) 38 and cuts.

  A guide groove 24 is formed in the recess 22 of the cutting blade 20. The guide groove 24 is formed so as to extend in the radial direction, a step portion 28 is formed at one end of the guide groove 24, and a wall portion is not formed at the other end, and penetrates in the radially outward direction. Formed as follows. As a result, the chips generated by cutting the fractured surface 46 of the bolt 38 enter the guide groove 24, and the guide groove 24 is moved radially outward by the centrifugal force accompanying the rotation of the tool member 12. Released to the outside of the member 12.

  Further, an engagement groove 26 is formed on the outer peripheral surface of the tool member 12. The engagement piece 32 of the cylindrical member 30 is engaged with the engagement groove 26. The engagement groove 26 is also used as a cost for a tool such as a monkey wrench used when the tool member 12 is attached to the power machine 16. Moreover, the tool member 12 is comprised with hard members, such as a metal or a diamond. Moreover, only the site | part of the cutting blade 20 among the tool members 12 may be comprised with a diamond, and another site | part may be comprised with a metal.

  The cylindrical member 30 has a cylindrical shape that covers the tool member 12, and an engagement piece 32 that protrudes in the radially inward direction is formed on the inner peripheral surface in the vicinity of one axial end portion (base end portion). The engaging piece 32 engages with the engaging groove 26 of the tool member 12, and the cylindrical member 30 is attached to the tool member 12. Note that the lubricating force for reducing the frictional force is applied between the engaging groove 26 of the tool member 12 and the engaging piece 32 of the cylindrical member 30, so that the rotational force of the tool member 12 is changed to the cylindrical member. Therefore, the cylindrical member 30 can be prevented from rotating (rotating) with the rotation of the tool member 12.

  Moreover, the cylindrical member 30 is comprised with colorless and transparent resin. Specifically, the cylindrical member 30 is made of a plastic resin, for example, polycarbonate. Thus, by comprising the cylindrical member 30 with transparent resin, the inside of the cylindrical member 30 can be recognized from the outside, and the tool member 12 can be used without removing the cylindrical member 30 from the bolt 38. The status of the cutting process can be confirmed.

  Furthermore, the cylindrical member 30 includes a bellows portion 34 that expands and contracts in the axial direction. As shown in FIGS. 2 and 3, the bellows portion 34 expands and contracts in the axial direction, thereby adjusting the separation distance between the tool member 12 and the fracture surface 46 of the bolt 38, and consequently the breakage of the bolt 38 from the tool member 12. The pressure acting on the cross section 46 can be adjusted.

  The inner diameter dimension of the other axial end portion (tip end portion) 31 of the cylindrical member 30 is set to be approximately the same as the outer diameter dimension of the nut 44. Thereby, the front-end | tip part 31 of the cylindrical member 30 joins the outer surface of the nut 44 screwed together with the volt | bolt 38, and thereby the center of the fracture surface 46 of the volt | bolt 38 and the center of the cutting blade 20 of the tool member 12 are made. It functions as a positioning unit for matching.

  In this way, the tip portion 31 of the cylindrical member 30 is joined to the outer surface of the nut 44 screwed into the bolt 38 to fix the nut 44, and the cutting blade 20 of the tool member 12 is connected to the fracture surface 46 of the bolt 38. Cutting starts upon contact. Further, even when the tip 31 of the tubular member 30 is joined to the outer surface of the nut 44 that is screwed with the bolt 38, the tubular member 30 is inclined so that the shaft of the tubular member 30 is inclined by utilizing the flexibility of the bellows 34. Since the shaped member 30 can be tilted left and right, the contact angle of the cutting blade 20 with respect to the fracture surface 46 of the bolt 38 can be freely adjusted in accordance with the shape of the fracture surface 46 of the bolt 38.

  Further, a magnet 36 as a collection unit is continuously provided in the circumferential direction on a portion of the inner surface of the cylindrical member 30 and in the vicinity of the cutting blade 20 of the tool member 12. For this reason, the metal chips generated by the cutting process of the fractured surface 46 of the bolt 38 are attracted and adhered to the magnet 36, and the chips generated by the cutting process of the fractured surface 46 of the bolt 38 are collected by the magnet 36. can do.

  As shown in FIGS. 5 to 7, a shear wrench, an impact wrench, a disc grinder, a charging impact, or the like is used for the power machine 16. When the power machine 16 operates, the drive shaft 18 is configured to rotate. The drive shaft 18 is configured such that the screw hole 14 of the tool member 12 constituting the socket 10 is screwed so that the tool member 12 rotates about the axis as the drive shaft 18 rotates.

  Moreover, as shown in FIGS. 5 to 7, the bolt 38 cut by the socket 10 is a high-strength TC bolt made of iron or metal, such as a steel structure such as a bridge or a building, a port structure, or wind power generation. It is used when steel plates are joined and fixed at a windmill, the base of a steel tower, or the like. That is, the bolt 38 includes a head portion 40, a shaft portion 42, and a washer, and a nut 44 is screwed onto the shaft portion 42. As an example of use of the bolt 38, a bolt shaft portion 42 is inserted between the stacked steel plates, and a nut 44 is screwed onto the shaft portion 42 from the side opposite to the head portion 40.

  Here, a plurality of burrs 48 are generated on the outer edge of the fracture surface (pin tail fracture surface) 46 at the tip of the shaft portion 42 of the bolt 38 before the surface treatment. In addition, a protruding burr (not shown) generated at the time of breakage occurs in the flat portion located at the center of the fracture surface 46. These burrs are removed using the socket 10. The following is a description of the removal method.

  As shown in FIGS. 5 to 7, the drive shaft 18 of the power machine 16 is inserted into the screw hole 14 of the tool member 12 and screwed. As a result, the socket 10 is attached to the power machine 16, and the tool member 12 can rotate about the axis as the drive shaft 18 rotates. When the setting of the socket 10 is completed, the cutting blade 20 of the tool member 12 is applied to the fracture surface 46 of the bolt 38 so that the tip 31 of the cylindrical member 30 is joined to the outer surface of the nut 44. At this time, the distal end portion 31 of the cylindrical member 30 is joined to the outer surface of the nut 44 screwed with the bolt 38, whereby the center (axial center) of the fracture surface 46 of the bolt 38 and the cutting blade 20 of the tool member 12. Match the center (axis). Thereby, the center (axial center) of the fracture surface 46 of the bolt 38 and the center (axial center) of the cutting blade 20 of the tool member 12 can be matched by using the distal end portion 31 of the cylindrical member 30 as a positioning portion. The positioning accuracy of the cutting blade 20 with respect to the fracture surface 46 of the bolt 38 can be increased. As a result, the surface treatment accuracy of the fracture surface 46 of the bolt 38 by the cutting blade 20 can be increased. Moreover, the center (axial center) of the fracture surface 46 of the bolt 38 and the center of the cutting blade 20 of the tool member 12 are obtained simply by joining the tip 31 of the cylindrical member 30 to the outer surface of the nut 44 screwed into the bolt 38. Since the (axial center) can be matched, a separate operation for matching the center (axial center) of the fracture surface 46 of the bolt 38 with the center (axial center) of the cutting blade 20 of the tool member 12 is not required. . As a result, the surface treatment efficiency of the fracture surface 46 of the bolt 38 can be increased.

  Next, the power machine 16 is operated to drive the drive shaft 18 to rotate. As a result, the tool member 12 rotates around the axis together with the drive shaft 18. When the tool member 12 rotates, the cutting blade 20 also rotates, and the contact portion between the cutting blade 20 and the fracture surface 46 of the bolt 38 is cut. As a result, the curved concave portion 22 of the cutting blade 20 cuts the fracture surface 46 of the bolt 38, so that all the burrs 48 formed on the fracture surface 46 of the bolt 38 are completely removed, and the fracture surface 46. Becomes a smooth curved surface. At this time, the axial center of the cylindrical member 30 is tilted up, down, left and right using the flexibility of the bellows portion 34 in a state where the tip end portion of the cylindrical member 30 is joined to the outer surface of the nut 44 screwed with the bolt 38. Therefore, the contact angle of the cutting blade 20 with respect to the fracture surface 46 of the bolt 38 can be freely adjusted in accordance with the shape of the fracture surface 46 of the bolt 38. As a result, the work efficiency of the surface work can be increased.

  6 and 7, the distance between the cutting blade 20 of the tool member 12 and the fracture surface 46 of the bolt 38 is adjusted by extending or contracting the bellows portion 34 of the cylindrical member 30 in the axial direction. Thus, the pressure acting on the fracture surface 46 of the bolt 38 from the cutting blade 20 of the tool member 12 can be adjusted. As a result, the pressure acting on the fracture surface 46 of the bolt 38 from the cutting blade 20 of the tool member 12 can be freely adjusted according to the material and situation of the fracture surface 46 of the bolt 38. As a result, the surface treatment accuracy of the fractured surface 46 of the bolt 38 can be further improved, and in addition, the work efficiency of the surface treatment can be increased.

  Here, when cutting by the cutting blade 20 is started, chips are generated from the fracture surface 46 of the bolt 38. The chips enter the guide groove 24 formed in the cutting blade 20. Then, the chips that have entered the guide groove 24 move in the guide groove 24 outward in the radial direction by the action of the centrifugal force of the tool member 12, and are eventually discharged from the end portion of the guide groove 24 in the radially outward direction. Is done. Then, the chips discharged to the outside in the radial direction of the guide groove 24 are attracted to and attached to the magnet 36 provided on the inner peripheral surface of the cylindrical member 30. In this way, since the chips generated by cutting the fracture surface 46 of the bolt 38 can be collected by the magnet 36, it is possible to prevent the chips from being scattered around the bolt 38. As a result, the work of collecting the chips scattered around the bolt 38 becomes unnecessary, and the work efficiency of the surface treatment work of the bolt 38 can be increased.

  When the surface treatment of the fracture surface of one bolt 38 is completed through the above steps, the surface treatment of the fracture surface 46 of another bolt 38 is executed in the same manner. By repeating this, the fractured surfaces 46 of all the bolts 38 are surface-treated. In addition, the chip | tip collection | recovery efficiency can be maintained by removing the swarf adhering to the magnet 36 of the cylindrical member 30 from the magnet 36 suitably.

  As described above, by surface-treating the fracture surface 46 with the tool member 12 corresponding to the size of the fracture surface 46 of the bolt 38, the fracture surface 46 can be efficiently surface-treated and the quality of the surface treatment is improved. be able to. Moreover, while covering the tool member 12 with the cylindrical member 30, and providing the magnet 36 which collects the chips accompanying cutting of the fractured surface 46 of the bolt 38, it is possible to prevent the chips from being scattered around. Further, the chips of the cutting blade 20 are collected in the guide groove 24 and then released to the outside of the tool member 12 and adhere to the magnet 36. As a result, the chips present between the cutting blade 20 and the fractured surface 46 of the bolt 38 can be removed, so that the chips do not have an adverse effect during the cutting process by the cutting blade 20. Can enhance the quality.

  In particular, since the tubular member 30 is made of a colorless and transparent resin, the inside of the tubular member 30 can be confirmed from the outside. Thereby, when performing the cutting process, it is possible to adjust the degree of contact of the cutting blade 20 with respect to the fracture surface 46 of the bolt 38 without separating the cutting blade 20 from the fracture surface 46 of the bolt 38. An efficient and accurate cutting process can be executed.

  The description of the disclosure content of Patent Document 1 is as described above. Next, as the present discussion, the scattering prevention cover according to the present embodiment will be described.

<First embodiment>
The scattering prevention cover according to the present embodiment corresponds to the cylindrical member 30. However, the scattering prevention cover according to the present embodiment is greatly different from the cylindrical member 30 in that it is a two-piece type. In addition, as other details, the scattering prevention cover according to the present embodiment is (1) not directly attached to the tool member 12 but attached to the power machine 16 side, (2) distance changing means and / or The cylindrical member 30 is different from the cylindrical member 30 in that the bellows part 34 as the tilt changing means is not provided.

  As shown in FIGS. 8 to 10, the anti-scattering cover 30 ′ according to the present embodiment includes a cylindrical upper cover 30 </ b> A that covers the tool member 12, a bolt 38 including the fracture surface 46, and the bolt 38. And a cylindrical lower cover 30 </ b> B covering the nut 44. The upper and lower covers 30A and 30B are both cylindrical, and the inner diameter of the lower cover 30B is substantially the same as the outer diameter of the upper cover 30A or larger than the outer diameter of the upper cover 30A. Therefore, the tip of the upper cover 30A can be inserted into the lower cover 30B.

  The upper and lower covers 30A and 30B are both made of a colorless and transparent resin. Specifically, the upper and lower covers 30A and 30B are made of a plastic resin, for example, polycarbonate. As described above, by configuring the upper and lower covers 30A and 30B with a transparent resin, the inside of the upper cover 30A and / or the lower cover 30B can be recognized from the outside, and the upper and lower covers 30A and 30B are recognized. The state of the cutting process by the tool member 12 can be confirmed without removing the bolt 38 from the bolt 38.

  The upper cover 30 </ b> A includes a cylindrical main body 50 and an attachment body 51 at one end (base end) in the axial direction of the main body 50. The attachment body 51 is a two-piece type, is a semi-cylindrical first member 51a attached to the base end portion of the main body 50, is substantially symmetrical with the first member 51a, and faces the first member 51a And a semi-cylindrical second member 51b constituting a substantially cylindrical shape. The upper cover 30A has an outer periphery of a portion where the first member 51a of the mounting body 51 does not rotate (specifically, an annular portion (annular portion) 19 provided in the main body of the motor coaxially with the drive shaft 18). The second member 51b is applied to a substantially half region on the opposite side, and the entire periphery is tightened by fastening means such as a hose band 52 from above. Thus, it is fixed to the power machine 16. As a result of attaching the upper cover 30A to the ring portion (ring portion) 19 of the power machine 16, the drive shaft 18 of the power machine 16 and the upper cover 30A are coaxial, that is, screwed to the drive shaft 18 of the power machine 16. The tool member 12 and the upper cover 30A are coaxial. In addition, the attachment body 51 (the first member 51a and the second member 51b) has a small diameter taper at one end in the axial direction of the upper cover 30A. The main body 50 and the attachment body 51 (the first member 51a thereof) may be referred to as “main body portion” and “attachment portion”, respectively, including the case where the main body 50 and the attachment body 51 (the first member 51a) are integrally formed.

  The lower cover 30 </ b> B includes a cylindrical main body 53 and a partition body 54 that is inserted in the main body 53 and attached to an intermediate position in the axial direction of the inner peripheral surface of the main body 53. The partition body 54 is a circular plate-like body, and a through hole 54a is formed at the center. The through hole 54a has an inner diameter that is substantially the same as the outer diameter of the bolt 38 or slightly larger than the outer diameter of the bolt 38 so that the bolt 38 can be passed therethrough. Further, since the plate-like body has a predetermined thickness, an inner peripheral surface is formed in the through hole 54a. An annular groove 54b is formed on the inner peripheral surface, and the annular groove 54b Sealing means such as an O-ring 55 is attached. Therefore, when the bolt 38 is inserted into the through hole 54a, the O-ring 55 comes into contact with the outer surface of the bolt 38 and there is a gap between the bolt 38 and the through hole 54a. Can be filled. The main body 53 and the partition body 54 may be referred to as “main body portion” and “partition portion”, respectively, including the case where the main body 53 and the partition body 54 may be integrally formed.

  The lower cover 30 </ b> B is divided into two parts by the partition 54, the inner space being divided into the other end portion (tip portion) side and the one axial end portion (base end portion) side. The former is a space for accommodating the nut 44. The latter is a space in which the bolt 38 protrudes through the through hole 54a of the partition 54, and the main body 50 and the partition 54 of the upper cover 30A are in a state where the tip of the upper cover 30A is in contact with the partition 54. Thus, this is a space that covers the work area where the fractured surface 46 of the bolt 38 is surface-treated. A magnet 56 as a means for magnetic attachment to the nut 44 is attached to the portion of the partition 54 facing the former.

  Therefore, according to the scattering prevention cover according to the present embodiment, it is possible to prevent chips from being scattered around the bolts 38 by the main body 50 of the upper cover 30A and the partition body 54 of the lower cover 30B, and the lower cover 30B. The partition 54 can prevent the chips from falling on the lower nut 44 or on a plate material (steel plate) that is an object to be tightened. That is, according to the scattering prevention cover according to the present embodiment, all the chips are collected in the upper space of the lower cover 30B. Therefore, the lower cover 30B is removed from the bolt 38 and the chips are easily collected. be able to. As a result, after removing the scattering prevention cover after finishing the surface treatment, cleaning work such as collecting or removing chips falling on the nut 44 or the plate material (steel plate) which is the object to be tightened is performed. It becomes unnecessary.

  Further, in the scattering prevention cover according to the present embodiment, the upper cover 30A is attached to the power machine 16, and the lower cover 30B is fixed to the nut 44 (by the magnet 56). There is basically no danger of falling. Therefore, even if the work is performed on the wall surface or the ceiling surface, that is, the work in the region from the side to the top, the upper cover 30A does not come off the power machine 16 and falls inadvertently. There is no possibility that the cover 30B may come off from the bolt 38 or the nut 44 and fall inadvertently. However, it is preferable that the lower cover 30B be connected to an operator via a connecting means such as a rope in case of a failure.

  In addition to the upper cover 30A as a modified example, various types as shown in FIG. 11 can be adopted as another example. In FIGS. 4A and 4B, the attachment body 51 ′ of the upper cover 30A ′ is attached in such a manner that it partially overlaps one axial end portion (base end portion) of the main body 50 ′. . Also, in FIGS. 3C and 3D, the attachment body 51 ″ of the upper cover 30A ″ has an annular convex portion and an annular shape with respect to one axial end portion (base end portion) of the main body 50 ″. It is attached by concave and convex fitting with the concave portion. Further, in FIGS. 5 (e) and (f), the attachment body 51 ′ ″ of the upper cover 30A ′ ″ is appropriately disposed with respect to one axial end portion (base end portion) of the main body 50 ′ ″. It is attached by a rivet 57. In addition, in FIGS. 4E and 4F, the first member 51a ′ ″ and the second member 51b ′ ″ of the mounting body 51 ′ ″ are fastened by screws 58 (and nuts not shown). The hose band 52 in the above embodiment is unnecessary.

  In addition to the lower cover 30B in the above embodiment, various types as shown in FIG. 12 can be adopted as another example. In any case, polygonal through holes 60a ′ and 60a ″ that are extrapolated or fitted to the nut 44 so that the center of the bolt 38 coincides with the center of the tool member 12 (the rotation center of the drive shaft 18 of the power machine 16). , 60a ′ ″ are provided with positioning bodies 60 ′, 60 ″, 60 ′ ″. The positioning bodies 60 ′, 60 ″, 60 ′ ″ are intermediate positions in the axial direction of the inner peripheral surfaces of the main bodies 53 ′, 53 ″, 53 ′ ″, and are partitioned bodies 54 ′, 54 ″, 54. It is mounted at a position lower than “″ and in parallel with the partitions 54 ′, 54 ″, 54 ′ ″. The main bodies 53 ′, 53 ″, 53 ′ ″ and the positioning bodies 60 ′, 60 ″, 60 ′ ″ may be referred to as “positioning portions”, including the case where they are integrally formed. is there.

  In addition, the one shown in FIGS. 1A and 1B is such that the lower cover 30B ′ is firmly fixed to the nut 44 by an appropriate ball plunger 62 provided so as to advance and retreat in the radial direction in the main body 53 ′. ing. Further, in the one shown in FIGS. 2C and 2D, a base 63 is provided on a positioning body 60 ″, and a magnet 56 as a means for magnetizing the nut 44 is attached to the base 63. . Further, any of the parts shown in (a) and (b), (c) and (d), (e) and (f) of FIG. That is, a magnet 56 as a means for magnetic attachment to the nut 44 is attached to the lower cover 30B ′, 30B ″, 30B ′ ″. As described above, the lower covers 30B ′, 30B ″, 30B ′ ″ are fixed to the nut 44 by the ball plunger 62 and the magnet 56, and therefore, the lower covers 30B ′, 30B ″, 30B ′ ″ are detached and dropped like the lower cover 30B in the above embodiment. There is no.

  In addition, a sheet-like magnet 64 as a chip collecting means is attached to the bottom surface and / or inner peripheral surface of the upper space of the lower cover 30B ′, 30B ″, 30B ′ ″, and the lower cover 30B. The chips accumulated in the upper space can be magnetically attached to the sheet magnet 64 and securely held in the upper space.

<Second embodiment>
As shown in FIGS. 13 to 18, the scattering prevention cover 300 according to the present embodiment is screwed into the cylindrical upper cover 300 </ b> A covering the tool member 12, the bolt 38 including the fracture surface 46, and the bolt 38. The lower cover 300B covers the nut 44. The upper and lower covers 300A, 300B are both cylindrical, and the tip of the upper cover 300A can be inserted into the lower cover 300B.

  The upper cover 300 </ b> A includes a cylindrical main body 500 and an attachment body 510 at one axial end portion (base end portion) of the main body 500. The attachment body 510 is screwed into an annular body 511 that is externally attached to the ring portion (annular portion) 19 of the power machine 16 and a female screw that is formed in the annular body 511 along the radial direction. And a male screw 512 whose distal end advances and retreats in the radial direction. The male screw 512 is provided at a circumferentially equally-divided location (three locations in the present embodiment) of the annular body 511, and protrudes also in the radially outward direction of the annular body 511, where a washer is inserted (if necessary). And) the nut 513 is screwed together.

  The inner diameter of the main body 500 is the same as or slightly larger than the outer diameter of the annular body 511, and a male screw 512 can be inserted into the base end portion of the main body 500 and equally divided in the circumferential direction. A notch (not shown) is formed so that the attachment body 510 can be inserted into the proximal end portion of the main body 500. Incidentally, a stepped portion is formed in the base end portion of the main body 500, and the annular body 511 of the attachment body 510 is locked here.

  When fixing the upper cover 300 </ b> A to the power machine 16, first, the attachment body 510 is extrapolated to the ring part (ring part) 19 of the power machine 16, and each male screw 512 is tightened to fix the attachment body 510 to the power machine 16. Next, the nut 513 is loosened, and the main body 500 is extrapolated to the attachment body 510 in a state where a sufficient gap is formed between the outer periphery of the annular body 511. In this state, the base end portion of the main body 500 is positioned outside the diameter of the annular body 511, and the main body 500 is fixed to the attachment body 510 by tightening the nut 513. In this way, the upper cover 300A is fixed to the power machine 16. As a result of attaching the upper cover 300A to the ring portion (ring portion) 19 of the power machine 16, the drive shaft 18 of the power machine 16 and the upper cover 300A are coaxial, that is, screwed to the drive shaft 18 of the power machine 16. The tool member 12 and the upper cover 300A are coaxial.

  The lower cover 300 </ b> B includes a case-shaped first main body 530 and a cylindrical second main body 540 attached to the lower side of the first main body 530. The first main body 530 has a flat cylindrical shape that is concentric with the second main body 540 in plan view, and has a cylindrical peripheral surface portion 531 and a circular top surface portion that closes one end opening (upper end opening) of the peripheral surface portion 531. 532 and a circular bottom surface portion 533 that closes the other end opening (lower end opening). The top surface portion 532 has a through hole 532a formed at a position eccentric from the center thereof. The through hole 532a has the same or substantially the same diameter as the tip of the main body 500 of the upper cover 300A so that the tip of the upper cover 300A can be inserted. The bottom surface portion 533 has a through hole 533a formed at the center thereof. The through hole 533a has an inner diameter dimension that is substantially the same as or slightly larger than the outer diameter dimension of the bolt 38, and allows the bolt 38 to pass therethrough.

  Further, the lower cover 300B is divided into two internal spaces, the other end portion (tip portion) side and the one axial end portion (base end portion) side, by a bottom surface portion 533 as a partition portion. The former is a space for accommodating the nut 44. The latter is a space in which the bolt 38 protrudes through the through hole 533a of the bottom surface portion 533, and the top cover 300A is inserted in the first main body 530 through the through hole 532a. The main body 500 and the first main body 530 of the lower cover 300 </ b> B cover a work area where the fractured surface 46 of the bolt 38 is surface-treated.

  Here, since the center of the through hole 532a of the top surface portion 532 of the first main body 530 and the through hole 533a of the bottom surface portion 533 of the lower cover 300B is eccentric in plan view, more specifically, the top surface portion 532. The through hole 532a of the bottom surface portion 533 is a small circle, and the through hole 533a of the bottom surface portion 533 is in the inscribed direction from the center of the through hole 532a of the top surface portion 532 in plan view. Since the position is shifted, the tip of the upper cover 300A is inserted into the through hole 532a and the bolt 38 is inserted into the through hole 533a. The fracture surface 46 of the bolt 38 comes to be located at the detached position.

  Further, the first main body 530 of the lower cover 300B is fastened by a bolt / nut 534 with the top surface portion 532 and the bottom surface portion 533 sandwiching the peripheral surface portion 531 therebetween, and when the fastening is loosened, the peripheral surface portion 531, the top surface portion 532, and the bottom surface portion 533 can be disassembled. Alternatively, since the bottom surface portion 533 is fixed to the peripheral surface portion 531, when the bolts and nuts 534 are loosened, the top surface portion 532 can be removed and the upper end portion of the first main body 530 is opened. Can do. Therefore, the top surface portion 532 functions as a lid portion that covers the upper space among the two internal spaces partitioned by the bottom surface portion 533 as the partitioning portion.

  The second main body 540 of the lower cover 300 </ b> B includes a positioning body 541 having a polygonal through hole 541 a that is extrapolated or fitted on the nut 44 so that the center of the bolt 38 coincides with the center of the second main body 540. The positioning body 541 is a lower end side position of the inner peripheral surface of the second main body 540 and is attached in parallel with the bottom surface portion 533. In addition, a through hole is provided in the circumferential direction of the second main body 540, and a cylinder 542 riveted to the through hole is fixed to a female screw formed on the inner surface of the cylinder 542. The jar 543 is screwed together. A plurality of the ball plungers 543 are provided at circumferentially equally divided locations (three locations in the present embodiment) of the second main body 540 so that the lower cover 300B is firmly fixed to the nut 44. Note that a nut may be used instead of the cylindrical body 542, and in this case, the nut is joined to the inner peripheral surface of the second main body 540 or the positioning body 541.

  Therefore, according to the scattering prevention cover according to the present embodiment, the upper cover 300A is fitted into the first main body 530 of the lower cover 300B and the through hole 532a formed in the first main body 530 and closes the through hole 532a. The chips can be prevented from scattering around the bolt 38 (the chips can be confined in the space and prevented from leaking to the outside), and the bottom 44 of the lower cover 300B allows the chips to be removed from the bottom nut 44. And falling on the plate material (steel plate) which is the object to be tightened. That is, according to the anti-scattering cover according to the present embodiment, all chips are collected in the first main body 530 which is the upper space of the lower cover 300B. Therefore, the lower cover 300B is removed from the bolt 38. Chips can be collected easily. As a result, after removing the scattering prevention cover after finishing the surface treatment, cleaning work such as collecting or removing chips falling on the nut 44 or the plate material (steel plate) which is the object to be tightened is performed. It becomes unnecessary.

  When collecting the chips, the chips accumulated in the first main body 530 of the lower cover 300B are turned upside down so as to be discharged from the through hole 532a, or the lower cover 300B is not turned over. Although it can be discharged from the through hole 533a, the bolt / nut 534 is loosened, the top surface portion 532 of the first main body 530 is removed, and the first main body 530 is opened obliquely with the top of the first main body 530 open. If the chips accumulated there are discharged, the chips can be discharged neatly, and the first main body 530 can be cleaned.

  Further, in the cover for preventing scattering according to the present embodiment, the upper cover 300A is attached to the power machine 16, and the lower cover 300B is fixed by the ball plunger 543. There is basically no gender. Therefore, the upper cover 300A does not fall off the power machine 16 and falls carelessly even when working on the wall surface or ceiling surface, that is, working in the region from the side to the top. There is no possibility that the cover 300B may come off from the bolt 38 or the nut 44 and fall inadvertently. However, it is preferable that the lower cover 300B is connected to an operator via a connecting means such as a rope in preparation for the case.

  Further, the scattering prevention cover according to the present embodiment inserts (or inserts) the position of the through hole 532a in the lower cover 300B for inserting (or inserting) the upper cover 300A and the bolt 38 as the surface treatment target. By shifting the position of the through-hole 533a for eccentricity (that is, shifting the center), the bolt 38 is shifted from the rotation center of the tool member 12, and the peripheral portion of the cutting blade 20 of the tool member 12 with respect to the bolt 38 Are in contact with each other. Therefore, since the cutting is performed at a portion having the highest peripheral speed in the cutting blade 20, the workability is high, the processing amount per unit time can be increased, and this is extremely useful industrially.

  Further, in the scattering prevention cover according to the present embodiment, the cutting blade 20 of the tool member 12 is flat along a plane orthogonal to the rotation axis of the tool member 12, so that the cutting blade 20 is perpendicular to the bolt 38. The cutting efficiency can be improved. That is, if the cutting blade 20 does not abut against the bolt 38 perpendicularly, warping (burr) is likely to occur around the finished surface of the bolt 38, and wasteful processing time is required for the removal processing. However, if the cutting blade 20 is brought into contact with the bolt 38 perpendicularly to perform cutting, the warpage (burr) is less likely to occur, so that no wasteful processing time is generated. It is highly useful and can increase the amount of processing per unit time, which is extremely useful industrially.

  Moreover, the thickness of the top surface portion 532 of the lower cover 300B is also involved in the action of bringing the cutting blade 20 into contact with the bolt 38 vertically. That is, since the top surface portion 532 has a predetermined thickness, the perpendicularity with respect to the top surface portion 532 of the upper cover 300A inserted into the through-hole 532a formed in the top surface portion 532 is suitably realized. As a result, the cutting blade 20 can be brought into contact with the bolt 38 perpendicularly.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in the first embodiment, the magnet 36 as the chip collecting means is not provided in the upper cover 30A, and the bellows part 34 as the distance changing means and / or the inclination changing means is provided in the upper cover 30A. Although not provided, the contents disclosed in Patent Document 1 described above do not technically interfere with the present invention, and are applicable to the present invention for each technical element or for each configuration. The magnet 36 as the means may be provided on the inner peripheral surface of the upper cover 30A to 30A ′ ″, and the bellows part 34 as the distance changing means and / or the inclination changing means is provided as the upper cover 30A to 30A. It may be provided in '' '.

  In the first embodiment, it has been mentioned that the inner diameter of the lower cover 30B is substantially the same as the outer diameter of the upper cover 30A or larger than the outer diameter of the upper cover 30A. When the bellows portion 34 is not provided, the inner diameter dimension of the lower cover 30B is somewhat larger than the outer diameter dimension of the upper cover 30A so that the upper cover 30A can be moved in the lower cover 30B in a direction intersecting the axial direction. On the contrary, when the bellows portion 34 is provided, it is not necessary to move the upper cover 30A within the lower cover 30B in a direction intersecting the axial direction, so the inner diameter of the lower cover 30B is so large. It does not have to be.

  In the first embodiment, the upper and lower covers 30A and 30B are both made of a colorless and transparent resin. However, from the viewpoint of durability and strength, the upper and lower covers 30A and 30B may be made of metal as in the second embodiment. . If it is made of metal, the inside cannot be transmitted unlike resin, but the fracture surface 46 of the bolt 38 is exposed in the upper space of the lower cover 30B, so the visibility of the working part is not impaired.

  In particular, regarding the relationship with Patent Document 1, among the disclosed contents of Patent Document 1, those that do not technically interfere with the first embodiment and / or the second embodiment are technical elements. Applicable to the first embodiment and / or the second embodiment for each or every configuration, and the disclosure contents of the first embodiment that do not technically interfere with the second embodiment Is applicable to the second embodiment for each technical element or for each configuration, and further, among the disclosed contents of the second embodiment, those that do not technically interfere with the first embodiment are technical elements. It goes without saying that the present invention can be applied to the first embodiment every time or every configuration.

  Although not directly related to the present invention, various tool members can be employed. For example, as disclosed in Patent Document 1, (1) a tool member is composed of a cutting blade and an adapter part to which the cutting blade is detachably attached (split type), thereby providing a cutting blade. (2) An intermittent cutting action by the guide groove occurs by forming the recess in a curved shape without providing the guide groove in the recess of the cutting blade. (3) The concave portion of the cutting blade is formed on the outer surface of the flat surface that is in contact with the flat end surface of the broken surface of the bolt, and on the outer edge of the broken surface of the bolt. By configuring with a tapered surface portion that contacts the square surface, in addition to the burrs formed on the square surface of the bolt, burrs formed on the end surface of the fracture surface can be removed at the same time, or (4) the cutting blade Overall against the fracture surface of the bolt By the inclined surface in contact with oblique, to reduce the contact area between the fracture surface of the cutting blade and the bolt, such it is possible to adopt a configuration. When a diamond blade is used as the cutting blade, there are no problems such as sparks, odors, and whetstone scraps that worsen the work environment as in the resinoid grindstone.

  In the second embodiment, the upper cover 300A and the lower cover 300B are used as a set, but the upper cover 300A is not used. For example, the outer diameter of the tool member 12 and the top surface portion of the lower cover 300B are used. Since the tool member 12 can close the upper space of the lower cover 300B if the inner diameter of the through-hole 532a of 532 matches or substantially matches, the tool member 12 can be directly placed in the upper space of the lower cover 300B. Can be inserted and used. In this regard, the lower cover 300B can be considered for other uses.

The enlarged view of the socket concerning patent documents 1 is shown. It is a longitudinal cross-sectional view of FIG. 1, Comprising: The state which set the socket to the volt | bolt is shown. It is a longitudinal cross-sectional view of FIG. 1, Comprising: The state which made the socket contact the broken surface of a volt | bolt is shown. The longitudinal cross-sectional view and bottom view of the socket are shown. It is explanatory drawing (sectional drawing) of the work condition of surface treatment using the socket, Comprising: The state before approaching a motor to a target object is shown. It is explanatory drawing (sectional drawing) of the work condition of the surface treatment using the socket, Comprising: The state which approached the target object to the motive power is shown. It is explanatory drawing (sectional drawing) of the work condition of surface treatment using the socket, Comprising: The state which is performing surface treatment is shown. It is a cover for scattering prevention which concerns on 1st embodiment, Comprising: (a) is a top view of an upper cover, (b) is a side view of an upper cover, (c) shows sectional drawing of a lower cover. Explanatory drawing (sectional drawing) of the state which set the cover for the scattering prevention is shown. Explanatory drawing (perspective view) of the work condition of the surface treatment using the scattering prevention cover is shown. (A) and (b) are the first modification, (c) and (d) are the second modification, and (e) and (f) are the third modification. An example is shown. (A) and (b) are the first modification, (c) and (d) are the second modification, and (e) and (f) are the third modification. An example is shown. It is a cover for scattering prevention which concerns on 2nd embodiment, Comprising: (a) is a top view of the partial structure of an upper cover, (b) shows sectional drawing of an upper cover. FIG. 2A is a perspective view of the lower cover, FIG. 2B is a plan view of the lower cover, and FIG. 2C is a sectional view of the lower cover. Explanatory drawing (sectional drawing) of the state which set the cover for the scattering prevention is shown. Explanatory drawing (perspective view) of the state which set the cover for scattering prevention is shown. Explanatory drawing (sectional drawing) of the work condition of the surface treatment using the scattering prevention cover is shown. Explanatory drawing (perspective view) of the work condition of the surface treatment using the scattering prevention cover is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Socket, 12 ... Tool member, 14 ... Screw hole, 16 ... Power machine, 18 ... Drive shaft, 19 ... Ring part, 20 ... Cutting blade, 22 ... Recessed part, 24 ... Guide groove, 26 ... Engagement groove, 28 ... Step part, 30 ... Tubular member, 30 '... Spattering prevention cover, 30A ... Upper cover, 30B ... Lower cover, 31 ... End part, 32 ... Engagement piece, 34 ... Bellows part, 36 ... Magnet, 38 ... Bolt , 40 ... head part, 42 ... shaft part, 44 ... nut, 46 ... fracture surface, 48 ... burrs, 50, 50 ', 50 ", 50'" ... main body (main body part), 51, 51 ', 51 '', 51 '' '... Attachment body (attachment part), 51a, 51a', 51a ", 51a '" ... First member, 51b, 51b', 51b ", 51b '" ... Second member 52 ... Hose band, 53, 53 ', 53 ", 53'" ... Main body (main body part), 54, 54 ', 54 ", 54'" ... Partition body (partition part), 4a, 54a ', 54a' ', 54a' '' ... through hole, 54b ... annular groove, 55 ... O-ring, 56 ... magnet, 57 ... rivet, 58 ... screw, 60 ', 60' ', 60' '' ... Positioning body (positioning part), 60a ', 60a' ', 60a' '' ... Through-hole, 62 ... Ball plunger, 63 ... Base, 64 ... Sheet magnet, 300 ... Cover for preventing scattering, 300A ... Top cover , 300B ... lower cover, 500 ... main body, 510 ... mounting body, 511 ... annular body, 512 ... male screw, 513 ... nut, 530 ... first main body, 531 ... peripheral surface portion, 532 ... top surface portion, 532a ... through hole, 533 ... bottom part, 533a ... through hole, 534 ... bolt / nut, 540 ... second main body, 541 ... positioning body, 541a ... through hole, 542 ... cylindrical body, 543 ... ball plunger

Claims (8)

  A scattering upper cover for a tool member that rotates around a shaft by a drive shaft of a power machine to surface-treat the fracture surface of a columnar element such as a bolt, and is a cylindrical upper cover that is attached to the power machine and covers the tool member And a lower cover that covers the columnar element. The lower cover is divided into two internal spaces by a partition having a through hole, and the upper cover can be inserted into one space from the tip side. In addition, a scattering prevention cover characterized in that the fracture surface of the columnar element protrudes from the other space through the through hole and into the one space.   The lower cover includes a case-shaped first main body and a cylindrical second main body attached below the first main body. The first main body includes a cylindrical peripheral surface portion and one end of the peripheral surface portion. 2. The top surface portion in which the through-hole is formed and the bottom surface portion in which the other end opening of the peripheral surface portion is formed and the through-hole is formed, and the bottom surface portion is the partition portion. Cover for preventing splashing. The cover for preventing scattering according to claim 1 or 2 , wherein when the columnar element is a bolt, the other space is also a space for accommodating a nut screwed into the bolt. Under cover, the other space, the center of the columnar bolt to rotate around a match or eccentricity of the tool member, according to claim 3 comprising a positioning portion having a through-hole of polygonal shape fitted extrapolated or outside the nut The cover for scattering prevention described in 1. The cover for preventing scattering according to any one of claims 1 to 4 , further comprising a sealing means for eliminating a gap with the columnar element on an inner peripheral surface of the through hole of the partition portion. The lower cover is provided with a lid for closing one of the space, according to any one of claims 1 to 5 configured upper cover is fitted from the front end portion in a through hole formed in the lid portion Cover for preventing splashing. The cover for scattering prevention according to claim 6 , wherein the lid is removable. The through hole of the lid, in the direction perpendicular to the central axis of the pillar-like elements, scattering preventing according to claim 6 or 7 centered at a position eccentric from the center of the through hole of the partition portion is formed is set cover.

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