JP2015037819A - Safety device for disc grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device for a disc grinder which has excellent safety in spite of a simple structure.SOLUTION: A safety device 20 for a disc grinder, which is attached to a disc grinder 10, includes a fixing member 21 for fixing the disc grinder 10, a movable protective body 22 which can be displaced upward from an initial position enclosing an outer peripheral part of a rotary disc 11, and an energizing member 23 which energizes the movable protective body 22 having been displaced upward from the initial position so as to return it to the initial position. When the safety device 20 for a disc grinder is attached to the disc grinder 10 and an object 50 to be ground is pressed to a lower side of the movable protective body 22, the movable protective body 22 is displaced upward from the initial position to enable grinding of the object 50 to be ground. When the rotary disc 11 is moved away from the object 50 to be ground, the movable protective body 22 is automatically returned to the initial position to bring the rotary disc 11 into a state where the rotary disc 11 is enclosed with the movable protective body 22.

Description

  The present invention relates to a safety device for a disk grinder that is used by being attached to a hand-held (portable) disk grinder having a rotating disk for grinding an object to be ground.

  Hand-held disc grinders are widely used for grinding metal products and the like. As this type of disk grinder, a rotating disk (grinding stone) for grinding an object to be ground is generally provided on the lower surface side of the front end of a long cylindrical body. An operator operates the disc grinder by manually grasping the disc grinder main body or a handle fixed to the main body, and grinds the grinding target object by pressing the rotating disc against the grinding target object. However, since the rotating disk rotates at a high speed, when the rotating disk comes into contact with a bulge existing on the surface of the object to be ground, the rotating disk bounced back to the bulge is the body of the worker or the surrounding people. There is a risk of contact. Further, there is a possibility that the body may come into contact with the rotating disk due to an operator's loss of balance. As described above, since the work using the hand-held disc grinder involves danger, safety measures are required to prevent the rotating disc from coming into direct contact with the body even in the above case.

  For example, in Patent Document 1, the rear half of a rotating disk (grindstone 1) is covered with a safety cover 2, and a semicircular arc-shaped frame (along the front edge of the outer periphery of the rotating disk 1 exposed from the safety cover 2) A disc grinder provided with a guard 4) has been proposed. Thereby, even if the rotating disk 1 is likely to come into contact with the worker's body, the frame 4 can reduce the impact. However, the frame 4 in the disc grinder of Patent Document 1 is made of a highly elastic material and does not prevent the rotating disc 1 from touching the body itself. In addition, since the frame 4 is provided only above the rotating disk 1, the frame 4 cannot even moderate the impact when the lower surface side of the rotating disk 1 contacts the body. For this reason, it is difficult to say that the disc grinder of Patent Document 1 is provided with sufficient safety measures.

  Further, Patent Document 2 discloses a pair of slide covers (a grindstone cover 3) that covers the rear half of the rotating disc (grinding stone 2) and a front outer peripheral portion of the rotating disc 2 that is exposed from the safety cover 3. There has been proposed a disc grinder that is provided with an inlet slide cover 7 and an outlet slide cover 10), and further provided with a pair of coil springs 9 and 10 for moving the pair of slide covers 7 and 10 forward and backward, respectively. Thereby, when the rotating disk is bounced back, the slide covers 7 and 10 can protrude instantaneously to cover the front outer peripheral portion of the rotating disk 2. However, the disc grinder of Patent Document 2 has a complicated structure related to safety measures, so that it is difficult to reduce the cost, and the metal powder from the object to be ground can be removed from the safety cover 3 and the slide cover 7. In the case of being sandwiched between the gaps 10 and the like, there is a risk that the slide covers 7 and 10 may not operate, and the reliability of the operation is not necessarily excellent. In addition, it is difficult to reduce the weight of the disc grinder of Patent Document 2 due to the complexity of its structure. Furthermore, since the disc grinder of Patent Document 2 does not match the direction in which the rotating disc 2 is pressed against the object to be ground and the direction in which the pair of slide covers 7 and 10 advance and retreat, the pair of slide covers during the grinding operation. 7 and 10 do not retract smoothly, and the pair of slide covers 7 and 10 may interfere with the grinding operation.

Japanese Utility Model Publication No.59-042840 JP 2010-029986 A

  The present invention has been made in order to solve the above-described problems, and provides a safety device for a disk grinder having a simple structure and excellent safety.

The above issues
A safety device for a disc grinder that is used by being attached to a hand-held disc grinder having a rotating disc for grinding an object to be ground,
A fixing member for fixing to the disc grinder;
A movable protective body supported directly or indirectly with respect to the fixed member in a state capable of being displaced upward from an initial position surrounding the outer periphery of the rotating disk;
A biasing member for biasing the movable protection body downward so that the movable protection body displaced upward from the initial position returns to the initial position;
When it is attached to the disc grinder,
When the object to be ground is pressed against the lower side of the movable protective body and the rotating disk is brought closer to the object to be ground, the movable protective body is displaced upward from the initial position, and the rotating disk is exposed. While the object can be ground,
When the rotating disk is moved away from the object to be ground, the movable protective body automatically returns to the initial position, so that the rotating disk is surrounded by the movable protective body. Solved by providing.

  Here, “indirectly supported” in “a movable protective body supported directly or indirectly with respect to the fixed member” means that the movable protective body is directly supported with respect to the fixed member. In addition, it means that the movable protective body is supported by the fixed member through other members such as a fixed protective body and a rotating member described later.

  The safety device for a disk grinder of the present invention is excellent in safety. That is, when a grinding operation is performed using a hand-held disc grinder equipped with the disc grinder safety device, the rotating disc is rebounded from the protrusion of the grinding object, for example, and separated from the grinding object. When external force is no longer applied to the movable guard from the object, the movable guard instantaneously returns to the initial position and covers the rotating disk, preventing the rotating disk from touching the body of the operator and the surrounding people. It is possible to do. And since the safety device for disc grinders of the present invention has a simple structure, it is possible not only to reduce costs but also to reduce weight. In addition, the disc grinder safety device according to the present invention is excellent in operation reliability because there is no gap between which grinding powder scattered from an object to be ground is sandwiched. Furthermore, the safety device for a disk grinder of the present invention pushes the rotating disk against the grinding object because the direction in which the rotating disk is pressed against the grinding object and the direction in which the movable protective body is displaced are nearly parallel. When hitting, the movable protective body can be displaced smoothly, and the movable protective body is structured not to obstruct the work.

  In the disc grinder safety device of the present invention, the movable protective body may surround the entire outer peripheral portion of the rotating disc. However, it is preferable that the movable protective body in the initial position surrounds only the front outer peripheral portion of the fixed disk without extending the movable protective body to the rear outer peripheral portion of the rotating disk. At this time, it is preferable that the rear outer peripheral portion of the rotating disk is surrounded by a fixed protection body provided integrally with the fixing member. In other words, it is preferable that the front outer peripheral portion of the rotating disk is surrounded by the movable protective body and the rear outer peripheral portion of the rotating disk is surrounded by the fixed protective body. In a hand-held disc grinder, the object to be ground is mainly grounded at the front part of the rotating disk, so when the movable protective body is displaced upward from the initial position, only the front part of the rotating disk is This is because there is no need to be able to displace the protective body (fixed protective body) covering the rear part of the rotating disk.

  Further, in the disc grinder safety device according to the present invention, the movable protective body only needs to be supported in a state displaceable upward from the initial position. For example, the movable protective body translates upward from the initial position. You may do it. However, considering further simplification of the structure of the disc grinder safety device, the movable protective body is fixed in a state where it can be pivotally displaced upward from the initial position with the vicinity of the rear end as a pivot center. It is preferable that it is supported directly or indirectly on the member. In this case, a shaft shaft for supporting the movable protection body directly or indirectly with respect to the fixed member is provided, and the urging member is a coil spring externally fitted to the shaft shaft for supporting. It is also possible to do.

  Furthermore, in the disc grinder safety device of the present invention, the fixing member is not particularly limited as long as each component such as a movable protective body can be fixed to the disc grinder. However, in order to make the fixing member as simple as possible, to facilitate its handling, and to fix the fixing member firmly to the disc grinder, the fixing member preferably has the following structure. In other words, the fixing member is preferably a clamp that is fastened and fixed to the outer peripheral surface of the boss portion for mounting the rotating disk in the disk grinder. The kind of clamp used at this time is not particularly limited. For example, a pair of clamp members having a C-shaped cross section are arranged outside the boss portions, and tightening means such as bolts inserted through end portions of the pair of clamp members, the pair of clamp members The thing etc. which make the outer peripheral part of a boss | hub part clamp are illustrated. At this time, one end portions of a pair of clamp members having a C-shaped cross section may be connected by a hinge or the like, and only the other end portions of the clamp members may be tightened by the tightening means.

  Furthermore, in the safety device for disc grinders of the present invention, the form of the movable protective body is not particularly limited. However, in order to reduce the weight of the movable protective body while increasing the safety of the safety device for the disk grinder, the movable protective body is provided with an upper frame positioned above the rotating disk in the initial state and in the initial state. It is preferable to configure with a lower frame located below the rotating disk. Thus, the movable protective body can be reduced in weight by adopting a frame structure for the movable protective body. In addition, the movable protective body is composed of an upper frame and a lower frame, so it is possible to prevent contact from the front and side surfaces of the rotating disk as well as from the upper surface side of the rotating disk. It has become.

  As described above, according to the present invention, it is possible to provide a safety device for a disc grinder that has a simple structure and is excellent in safety.

It is the figure which showed the state which looked at the handheld disk grinder which the safety device for disk grinders is not attached from the side. It is the figure which showed the state which looked at the handheld disk grinder from which the safety device for disk grinders is not attached from upper direction. It is the figure which showed the state which looked at the handheld disk grinder with which the safety device for disk grinders of this invention was attached from the side. It is the figure which showed the state which looked at the handheld disk grinder with which the safety device for disk grinders of this invention was attached from upper direction. It is the figure which showed the state which looked at the safety device for disk grinders of this invention from the side. It is the figure which showed the state which looked at the safety device for disk grinders of this invention from upper direction. FIG. 2 is an enlarged view of a disc grinder to which a disc grinder safety device according to the present invention is attached, in which the periphery of the disc grinder safety device is viewed from the side when the movable protective body is in the initial position. is there. The disk grinder to which the safety device for a disk grinder of the present invention is attached, wherein the periphery of the safety device for the disk grinder when the movable protective body is displaced upward from the initial position is enlarged from the side. FIG.

[Outline of safety device for disc grinder]
A preferred embodiment of the disc grinder safety device of the present invention will be described more specifically with reference to the drawings. The disc grinder safety device of the present invention is used by being attached to a hand-held disc grinder 10 as shown in FIGS. FIG. 1 is a view showing a state in which a hand-held disc grinder 10 without a disc grinder safety device attached is viewed from the side, and FIG. 2 shows a state in which the disc grinder 10 is viewed from above. It is a figure.

  As shown in FIGS. 1 and 2, the disc grinder 10 includes a rotating disc 11 (grinding stone) for grinding an object to be ground and a long cylindrical main body 12. A boss portion 12a (FIG. 1) for attaching a rotating disk is provided on the lower surface side of the front end portion of the main body 12, and the rotating disk 11 is fixed to the distal end portion of the rotating shaft 12b extending downward from the boss portion 12a. ing. The rotating disk 11 is rotated around a rotating shaft 12b by a motor (not shown) provided inside the main body 12 to grind an object to be ground. As shown in FIG. 2, handle fixing portions 12c for fixing the detachable handle 13 are provided at a plurality of locations at the front end portion of the main body 12, depending on the right-handed and left-handed or grinding operations. A handle fixing portion 12c for fixing the detachable handle 13 can be selected.

  FIG. 3 is a view showing a state in which the hand-held disc grinder 10 to which the disc grinder safety device 20 of the present invention is attached is viewed from the side, and FIG. 4 is a view of the disc grinder as viewed from above. FIG. FIG. 5 is a diagram showing a state in which the disc grinder safety device 20 of the present invention is viewed from the side, and FIG. 6 is a diagram showing a state in which the disc grinder safety device 20 is viewed from above. . As shown in FIGS. 5 and 6, the disc grinder safety device 20 of this embodiment includes a fixed member 21, a movable protective body 22, a biasing member 23, a fixed protective body 24, a rotating member 25, The shaft support shaft body 26 is provided. Hereinafter, each part which comprises the safety device 20 for disc grinders of this embodiment is demonstrated in detail in order.

[Fixing member]
As shown in FIG. 3, the fixing member 21 is for fixing the disc grinder safety device 20 to the disc grinder 10. The specific structure of the fixing member 21 is not particularly limited. In the disc grinder safety device 20 of the present embodiment, as shown in FIGS. 5 and 6, the fixing member 21 includes a pair of front and rear clamp members 21a and 21b having a C-shaped horizontal section, and both left and right ends of the clamp members 21a and 21b. It consists of a pair of left and right bolts 21c for passing through the respective parts. The fixing member 21 is configured to fasten a pair of left and right bolts 21c with the clamp members 21a and 21b sandwiching the outer peripheral surface of the boss portion 12a (FIG. 1) of the disc grinder 10.

  When the fixing member 21 has the above structure, the disc grinder safety device 20 can be easily and firmly fixed to the boss portion 12a. In the disc grinder safety device 20 of the present embodiment, the left and right ends of the clamp members 21a and 21b are tightened with the bolts 21c, but one of the pair of left and right bolts 21c has the clamp members 21a and 21b. It is good also as a hinge connected in the state which can be opened and closed.

  As described above, in addition to fixing the fixing member 21 to the boss portion 12a of the disc grinder 10, the lower surface side of the movable protective body 22 and the fixed protective body 24 is opened as will be described later. With the structure, the rotating disk 11 can be easily replaced. That is, even when it is necessary to replace the rotating disk 11 due to wear, the disc grinder safety device 20 remains attached to the disc grinder 10 without removing the disc grinder safety device 20 from the disc grinder 10. In this state, the rotating disk 11 can be replaced.

[Movable protective body, fixed protective body, rotating member and shaft body for shaft support]
As shown in FIGS. 3 and 4, the movable protective body 22 surrounds the front outer peripheral portion of the rotating disk 11 so that the front side portion of the rotating disk 11 does not come into contact with the body of the worker or the surrounding people. Has become. On the other hand, as shown in FIGS. 3 and 4, the fixed protection body 24 surrounds the rear outer peripheral portion of the rotating disk 11 so that the rear portion of the rotating disk 11 does not come into contact with the body of the worker or the surrounding people. It is meant to be

  The fixed protector 24 is provided integrally with the fixed member 21 in a state where it cannot be moved relative to the fixed member 21 (in other words, a state where it cannot be moved relative to the rotating disk 11). It has been. On the other hand, the movable protective body 22 can be rotated and displaced relative to the fixed member 21 (in other words, can be rotated and displaced relative to the rotating disk 11). ). In the disc grinder safety device 20 according to the present embodiment, as shown in FIGS. 5 and 6, a pair of left and right shaft support shafts 26 are provided at the left and right ends of the front side of the fixed protector 24, and each shaft support is provided. A pair of left and right rotating members 25 are pivotally supported on the shaft body 26, and the left end portion and the right end portion of the movable protection body 22 are fixed to the respective rotating members 25. For this reason, the movable protection body 22 can be rotationally displaced about the center line of the shaft support shaft body 26 disposed in the vicinity of the rear end portion thereof.

  However, when the movable protection body 22 is pivoted upward from the initial position (position where the movable protection body 22 surrounds the rotary disk 11; see FIG. 7), a stopper mechanism (upper stopper mechanism) (not shown) is provided. By acting, the movable protective body 22 is in a state in which the movable protective body 22 cannot be rotated and displaced further upward. On the other hand, when the movable protective body 22 is turned downward from the state in which the movable protective body 22 is turned upward, when the movable protective body 22 reaches the initial position, a stopper mechanism (lower stopper mechanism) (not shown) is shown. Acts so that the movable protective body 22 cannot be rotated and displaced downward any further. For this reason, the movable protection body 22 can be rotationally displaced only within a predetermined angle range upward from the initial position.

  FIG. 7 shows the disc grinder 10 to which the disc grinder safety device 20 of the present invention is attached, and shows the periphery of the disc grinder safety device 20 from the side when the movable protective body 22 is in the initial position. It is the figure which expanded and showed. FIG. 8 shows the disc grinder 10 to which the disc grinder safety device 20 of the present invention is attached, and the periphery of the disc grinder safety device 20 when the movable protective body 22 is displaced upward from the initial position is shown. It is the figure which expanded and showed the state seen from the direction.

  If the movable protective body 22 can prevent the front portion of the rotating disk 11 from coming into contact with the body of an operator or the like when the movable protective body 22 is in the initial position (position of FIG. 7), its specific form There is no particular limitation. In the disc grinder safety device 20 of the present embodiment, as shown in FIG. 7, the movable protective body 22 includes an upper frame 22a positioned above the rotating disk 11 in the initial state, and the rotating frame 11 in the initial state. A lower frame 22b located on the lower side, and a connecting frame 22c that connects the upper frame 22a and the lower frame 22b in the vertical direction at a predetermined location.

  As shown in FIG. 4, the upper frame 22 a and the lower frame 22 b are hard bars that are curved in a plan view semicircular arc shape (a plan view semicircular arc shape having a diameter slightly larger than the outer diameter of the rotating disk 11). (In the disc grinder safety device 20 of the present embodiment, the metal frame is used). In addition, as shown in FIG. 3, the upper frame 22a and the lower frame 22b are arranged in an inclined state so that the upper and lower gaps become narrower as they approach the rear end (left end and right end). Has been.

  Further, as shown in FIG. 3, the connection frame 22c is formed of a hard bar material (a metal frame in the disc grinder safety device 20 of the present embodiment) extending in the vertical direction. In addition, as shown in FIG. 4, the connecting frame 22c has a plurality of locations on the upper frame 22a and the lower frame 22b (in the disc grinder safety device 20 of this embodiment, the left and right sides of the upper frame 22a and the lower frame 22b). It is provided in a total of two locations, a portion slightly from the left and a portion slightly to the right from the middle portion in the direction).

  By making the movable protective body 22 have the above-described frame structure, it is possible to make the movable protective body 22 lightweight with high strength. In addition, as shown in FIG. 7, when the movable protection body 22 is in the initial position, the operator's body or the like from the upper side, the front side, the left side, or the right side of the rotary disk 11 is the front side of the rotary disk 11. Even when approaching the portion, the operator's body or the like does not come into contact with the front portion of the rotating disk 11. For this reason, the movable protector 22 is excellent in safety.

  The fixed protector 24 may also have a frame structure like the movable protector 22. However, in the disc grinder safety device 20 of the present embodiment, the fixed protector 24 has a semicircular upper surface portion in plan view and a downward surface from the arc-shaped peripheral edge portion of the upper surface portion as shown in FIGS. And a hard cover (a metal cover in the disc grinder safety device 20 according to the present embodiment) integrally formed with a side surface portion extending in a straight line. As described above, the fixed protective body 24 arranged behind the rotating disk 11 is constituted by a continuous surface cover, thereby preventing the grinding powder from being scattered to the operator side when grinding the object 50 to be ground. It is possible to do.

[Biasing member]
As shown in FIG. 8, the urging member 23 faces the movable protection body 22 downward so that the movable protection body 22 rotated and displaced above the rotary disk 11 automatically returns to the initial position shown in FIG. 7. It is for energizing (direction of arrow B of Drawing 8). Accordingly, as shown in FIG. 7, when the rotating disk 11 is brought closer to the grinding object 50 with the grinding object 50 pressed against the lower side of the movable protection body 22 in the initial position (or the rotating disk). 11 is rotated in the direction of arrow B in FIG. 7 and the rotary disk 11 is tilted with respect to the surface of the object 50 to be ground), the movable protection body 22 moves upward from the initial position (indicated by the arrow A in FIG. 7). The rotating disk 11 is exposed from the lower surface side of the movable protection body 22 as shown in FIG. It will be in the state which can grind the grinding object 50 in the front side part.

  At this time, since the direction in which the rotating disk 11 is pressed against the grinding object 50 and the direction in which the movable protective body 22 is rotationally displaced are nearly parallel, when the rotating disk 11 is pressed against the grinding object 50. Can smoothly displace the movable protector 22 upward. Therefore, when the grinding object 50 is ground, the movable protection body 22 has a structure that does not easily get in the way. This is the same even when the rotating disk 11 is worn down. That is, the rotating disk 11 having a diameter of 180 mm in a new state is generally used until the diameter becomes 100 mm or less, but in this way, the diameter of the rotating disk 11 is reduced from the new state. Even in this case, the movable protective body 22 does not interfere with the grinding of the grinding object 50 by the rotating disk 11. For this reason, it is possible to use the rotating disk 11 for a long time without wasting it.

  On the other hand, as shown in FIG. 8, the rotating disk 11 is pressed against the grinding object 50, and the grinding object 50 is ground at the front portion of the rotating disk 11 exposed from the lower surface side of the movable protective body 22 ( When the rotary disk 11 is moved away from the object to be ground 50 from the state in which the movable protective body 22 is rotated and displaced upward from the initial position (or the rotary disk 11 is rotated in the direction of arrow A in FIG. The movable protective body 22 automatically rotates downward (in the direction of arrow B in FIG. 8) (relatively relative to the rotating disk 11) by the urging force of the urging member 23. As shown in FIG. 7, the movable protective body 22 returns to the initial position, and the front portion of the rotating disk 11 is surrounded by the movable protective body 22.

  As described above, the movable protection body 22 is urged so as to return to the initial position by the urging member 23. For this reason, as shown in FIG. 8, when the grinding object 50 is being ground using the hand-held disc grinder 10, the rotating disk 11 is rebounded on the protrusion of the grinding object 50. However, since the movable protective body 22 instantaneously returns to the initial position and covers the front side portion of the movable protective body 22 at the moment when the movable protective body 22 moves away from the grinding object 50, the rotary disk 11 is used by the operator and its There is no direct contact with the surrounding human body.

  The form of the urging member 23 is not particularly limited as long as the urging member 23 can urge the movable protection body 22 that is pivotally displaced upward from the initial position so as to return to the initial position. In particular, a spring material such as a coil spring or a leaf spring can be suitably used as the urging member 23. In the disc grinder safety device 20 of the present embodiment, the biasing member 23 is a coil spring that is externally fitted to a pair of left and right shaft support shafts 26 as shown in FIGS. One end of the coil spring 23 is inserted into and latched by a latching hole 24 a provided in the side surface of the fixed protection body 24, and the other end of the coil spring 23 is provided so as to protrude inward from the rotating member 25. It is latched by the outer peripheral surface of the latching shaft body 25a.

  For this reason, as shown in FIG. 7, from the state where both ends of the coil spring 23 are opened, as shown in FIG. 8, the movable protective body 22 is pivotally displaced upward and the both ends of the coil spring 23 are closed. Then (when the opening angle θ of the coil spring 23 becomes smaller), an urging force is generated at both ends of the coil spring 23 in the direction in which the coil spring 23 opens, and the movable protection body 22 is urged in the direction indicated by arrow B in FIG. It has become. The place where the one end of the coil spring 23 is hooked is not limited to the hooking hole 24a of the fixed protection body 24, and the same action can be obtained as long as it does not move relative to the fixing member 21. it can. Further, the place where the other end of the coil spring 23 is hooked is not limited to the hooking shaft body 25a of the rotating member 25, and any part that rotates and displaces integrally with the movable protective body 22 can be used. Similar effects can be obtained.

DESCRIPTION OF SYMBOLS 10 Disc grinder 11 Rotating disk 12 Main body 12a Boss part for rotating disk 12b Rotating shaft 12c Handle fixing part 13 Detachable handle 20 Disc grinder safety device 21 Fixing member 21a Clamp member 21b Clamp member 21c Bolt (clamping means)
DESCRIPTION OF SYMBOLS 22 Movable protective body 22a Upper frame 22b Lower frame 22c Connection frame 23 Energizing member 24 Fixed protective body 24a Latching hole 25 Rotating member 25a Shaft body 26 latching shaft body

Claims (6)

A safety device for a disc grinder that is used by being attached to a hand-held disc grinder having a rotating disc for grinding an object to be ground,
A fixing member for fixing to the disc grinder;
A movable protective body supported directly or indirectly with respect to the fixed member in a state capable of being displaced upward from an initial position surrounding the outer periphery of the rotating disk;
A biasing member for biasing the movable protection body downward so that the movable protection body displaced upward from the initial position returns to the initial position;
When it is attached to the disc grinder,
When the object to be ground is pressed against the lower side of the movable protective body and the rotating disk is brought closer to the object to be ground, the movable protective body is displaced upward from the initial position, and the rotating disk is exposed. While the object can be ground,
When the rotating disk is moved away from the object to be ground, the movable protective body automatically returns to the initial position, so that the rotating disk is surrounded by the movable protective body. . The movable protective body does not extend to the rear outer peripheral portion of the rotating disk, and the movable protective body in the initial position surrounds only the front outer peripheral portion of the fixed disk,
2. The disc grinder safety device according to claim 1, wherein a rear outer peripheral portion of the rotating disc is surrounded by a fixed protection body provided integrally with the fixing member.   3. The disc grinder according to claim 2, wherein the movable protective body is supported directly or indirectly with respect to the fixed member in a state in which the movable protective body can be pivoted and displaced upward from the initial position with the vicinity of the rear end portion as a pivot center. Safety device. A shaft body is provided for supporting the movable protective body directly or indirectly with respect to the fixed member,
4. The safety device for a disk grinder according to claim 3, wherein the urging member comprises a coil spring fitted on the shaft body for shaft support.   The disc grinder safety device according to any one of claims 1 to 4, wherein the fixing member is a clamp that is fastened and fixed to an outer peripheral surface of a boss portion for mounting the rotating disc in the disc grinder.   The disk according to any one of claims 1 to 5, wherein the movable protector is composed of an upper frame positioned above the rotating disk in the initial state and a lower frame positioned below the rotating disk in the initial state. Safety device for grinders.

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