Device for replacing abrasive member of die grinder

Abstract

The present invention relates to a device for replacing an abrasive member of a die grinder, the device having an improved structure wherein a simple rotation of a sleeve moves a stop rod in a straight line, and thus, allowing anyone to easily unlock a collet chuck with one hand and improving on-site usability. In particular, the device comprises a stop groove (10), a deflector (20), a stop rod (30), and a sleeve (40) as main components, wherein the sleeve protects the outer circumferential surface of the deflector, and an O-ring maintains an airtight seal between the deflector and the sleeve such that foreign substances are prevented from entering and causing malfunctions.

Description

Die grinder grinder grinding component replacement device

[0001] The present invention relates to a grinding member replacement device for a die grinder, and more specifically, to a grinding member replacement device for a die grinder in which the structure is improved so that the stop rod moves in a straight line by a simple operation of rotating the sleeve, allowing anyone to easily unlock the collet chuck with one hand, thereby improving on-site workability, and in particular, the outer surface of the deflector is protected by the sleeve, and airtightness is maintained between the deflector and the sleeve by an O-ring, thereby blocking the ingress of foreign matter and preventing malfunction caused by foreign matter.

[0002]

[0003] Typically, die grinders are widely used to polish the surface of objects made of wood, stone, or various metals by mounting an abrasive material on a rotating shaft that operates at high speed by motor drive or air pressure from a compressor, or to finish parts that have not been processed, edges, etc.

[0004] In addition, the abrasive element is manufactured in various shapes and forms depending on the material or size of the object and is configured as a single unit integrated into the abrasive holder, and the abrasive holder is configured to be mounted on the rotating shaft of the grinder; in this case, the abrasive element is a consumable part and is configured to be replaced periodically according to its wear condition.

[0005] For example, in order to replace the grinding member, a dedicated wrench is attached to the rotating shaft of the grinder, and another tool is attached to the tightening nut to loosen or tighten it. Therefore, when replacing the grinding member on-site, the grinder body must be fixed with the foot, and two dedicated wrenches must be attached simultaneously with both hands and rotated in opposite directions.

[0006] In accordance with the prior art disclosed in Registered Utility Model No. 20-0373648, a technology has been disclosed comprising: a grinding holder having a grinding member mounted on one side for processing an object and an insertion rod having a groove formed on the other side; a coupling having a seating portion for receiving the insertion rod of the grinding holder and a screw hole formed therein for connecting to the rotational axis of a grinder body; a sleeve mounted to slide elastically on the circumferential surface of the coupling; and a locking ball arranged to engage and disengage the grinding holder by moving toward a through hole formed in the center of the coupling as the sleeve moves.

[0007] However, the above-mentioned conventional technology allows the grinding holder mounted on the rotating shaft of the grinder body to be easily attached and detached in a one-touch manner, thereby eliminating the need for separate tools or fastening means and making the replacement of the grinding member simpler, thus improving overall work efficiency. However, due to the fastening tolerance between the inner diameter of the coupling and the outer diameter of the insertion rod of the grinding holder, movement occurs due to the fastening tolerance while the insertion rod is inserted into the coupling, and this causes eccentric vibration during rotational movement, resulting in a decrease in precision of the grinding work and an increase in work fatigue.

[0008]

[0009] Accordingly, the present invention was conceived to solve the aforementioned problems, and aims to provide a grinding member replacement device for a die grinder in which the structure is improved so that the stop rod moves in a straight line by a simple operation of rotating the sleeve, allowing anyone to easily unlock the collet chuck with one hand, thereby improving on-site workability, and in particular, the outer surface of the deflector is protected by the sleeve, and airtightness is maintained between the deflector and the sleeve by an O-ring, thereby blocking the ingress of foreign matter and preventing malfunction caused by foreign matter.

[0010]

[0011] To achieve this purpose, the features of the present invention include: a stop groove (10) provided on the outer surface of a collet chuck (2) of a die grinder (1); a deflector (20) formed in a cylindrical shape to surround the outer surface of the collet chuck (2), having a connector (21) installed at one end to be mounted on the main body of the die grinder (1), and having a guide hole (22) formed at a position corresponding to the stop groove (10); and a stop rod (30) inserted together with an elastic body (31) into the guide hole (22), having a conical tip (32) formed at one end corresponding to the stop groove (10), and having a cam head part (33) provided at the other end. The invention is characterized by including a sleeve (40) that is inserted into the outer surface of the deflector (20) and rotatably installed, and has a cam rail portion (41) formed on the inner surface corresponding to the cam head portion (33), and is configured such that when rotated, the cam rail portion (41) presses the cam head portion (33) toward the stop groove (10).

[0012] At this time, the deflector (20) is spaced apart from the main body of the grinder (1) to form an inner space (23), and a plurality of air holes (24) are formed through it so as to be parallel to the rotation axis of the collet chuck (2), and is characterized by being configured so that air circulates to the outside within the inner space (23) through the air holes (24).

[0013] Additionally, the sleeve (40) is inserted into the outer surface of the deflector (20) and is constrained by a snap ring (42) that is fastened to the outer surface of the deflector (20). An O-ring (43) is inserted and installed on the inner surface of the sleeve (40), and the O-ring (43) maintains airtightness between the outer surface of the deflector (20) and the inner surface of the sleeve (40). The sleeve (40) is configured such that rotational resistance is generated between the O-ring (43) and the outer surface of the deflector (20) due to frictional resistance.

[0014] Additionally, the cam rail section (41) includes an unlock rail section (41a) that accommodates the cam head section (33) by being formed in a recessed portion with a diameter expanded relative to the inner diameter of the sleeve (40), and a locking rail section (41b) that is formed at an inclined angle to connect the unlock rail section (41a) and the inner surface of the sleeve (40) and presses the cam head section (33) toward the stop groove (10). When the cam head section (33) is positioned in the unlock rail section (41a) due to the rotation angle of the sleeve (40), the stop rod (30) is extended and transported toward the sleeve (40), causing the conical tip (32) to operate to unlock the stop groove (10). When the cam head section (33) is pressed toward the stop groove (10) in the locking rail section (41b) due to the rotational movement of the sleeve (40), the conical tip (32) It is characterized by being locked in place by engaging with the stop groove (10), and when the cam head part (33) contacts the inner surface of the sleeve (40) due to the rotational movement of the sleeve (40), the conical tip (32) is provided to maintain the locked position by engaging with the stop groove (10).

[0015] Additionally, a stop pin (44) is installed on the outer surface of the deflector (20) corresponding to the unlock rail section (41a), and the stop pin (44) is received within the unlock rail section (41a) to limit the rotational movement angle of the sleeve (40).

[0016] Additionally, the stop home (10) is provided to correct its position at an angle corresponding to the conical tip (32) by an angle correction module (50), and the angle correction module (50) includes an outer rail (51) formed in a recessed section along the outer surface of the deflector (20), an inclined rail (52) connected to one end of the outer rail (51) and having the other end penetrate into the deflector (20) at an inclined angle, and a push piece (53) received in the outer rail (51) and the inclined rail (52), having one end connected to the inner surface of the sleeve (40) and the other end protruding into the deflector (20), and when the sleeve (40) is rotated to lock the collet chuck (2), the push piece (53) travels along the outer rail (51) and the inclined rail (52) in conjunction with the rotational movement of the sleeve (40). It is characterized by being configured such that while the outer surface of the collet chuck (2) is pressed at an eccentric position while the collet chuck (2) is corrected in the rotational direction as it protrudes inwardly from the deflector (20), the cam head part (33) is pressed in the locking rail section (41b) so that the conical tip (32) and the stop groove (10) engage at an angle that matches each other to perform a locking operation.

[0017]

[0018] According to the above configuration and operation, the present invention is structurally improved so that the stop rod moves in a straight line by a simple operation of rotating the sleeve, allowing anyone to easily unlock the collet chuck with one hand, thereby improving on-site workability. In particular, the outer surface of the deflector is protected by the sleeve, and an airtight seal is maintained between the deflector and the sleeve by an O-ring, thereby blocking the ingress of foreign matter and preventing malfunctions caused by foreign matter.

[0019]

[0020] FIG. 1 is a longitudinal cross-sectional view showing the overall grinding member replacement device of a die grinder according to an embodiment of the present invention.

[0021] FIGS. 2 and 3 are operating state diagrams of a grinding member replacement device of a die grinder shown by cutting along line A-A' of FIG. 1.

[0022] FIG. 4 is a configuration diagram showing an angle correction module of a grinding member replacement device of a die grinder according to an embodiment of the present invention.

[0023]

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Furthermore, in describing the present invention, detailed descriptions of related known functions are omitted if they are deemed obvious to those skilled in the art and could unnecessarily obscure the essence of the invention.

[0025] FIG. 1 is a longitudinal cross-sectional view showing the entire grinding member replacement device of a die grinder according to an embodiment of the present invention, FIG. 2 and FIG. 3 are operating state diagrams of the grinding member replacement device of a die grinder shown by cutting along line A-A' of FIG. 1, and FIG. 4 is a configuration diagram showing an angle correction module of the grinding member replacement device of a die grinder according to an embodiment of the present invention.

[0026] The present invention relates to a grinding member replacement device for a die grinder, wherein the structure is improved so that the stop rod moves in a straight line by a simple operation of rotating the sleeve, allowing anyone to easily unlock the collet chuck with one hand, thereby improving on-site workability, and in particular, the outer surface of the deflector is protected by the sleeve, and airtightness is maintained between the deflector and the sleeve by an O-ring to block the ingress of foreign matter and prevent malfunction caused by foreign matter, and the main components include a stop groove (10), a deflector (20), a stop rod (30), and a sleeve (40).

[0027] The stop groove (10) according to the present invention is provided on the outer surface of the collet chuck (2) of the die grinder (1).

[0028] The above stop groove (10) is configured to engage with the conical tip (32) of the stop rod (30) described later, and is arranged at equal intervals on the outer surface of the collet chuck (2).

[0029] For example, in FIG. 2, nine stop grooves (10) are shown arranged at equal intervals, but this is not limited to this, and the number of applications can be flexibly changed according to the size of the collet chuck (2).

[0030] Additionally, the deflector (20) according to the present invention is formed in a cylindrical shape to surround the outer surface of the collet chuck (2), has a connector (21) installed at one end to be mounted on the main body of the die grinder (1), and has a guide hole (22) formed at a position corresponding to the stop groove (10).

[0031] The above deflector (20) is detachably installed on the main body of the die grinder (1) through a connector (21). Here, the connector (21) is formed as a nut type with a female screw portion formed on its inner surface and can be configured to be screwed into a male screw portion formed on the outer surface of the main body of the die grinder (1).

[0032] And, the guide hole (22) is formed to be orthogonal to the rotation axis of the collet chuck (2), and a stop rod (30), which will be described later, is inserted into it so as to be linearly movable.

[0033] At this time, the deflector (20) is spaced apart from the main body of the grinder (1) to form an inner space (23), and a plurality of air holes (24) are formed through it so as to be parallel to the rotation axis of the collet chuck (2), and is configured so that air circulates to the outside within the inner space (23) through the air holes (24).

[0034] In this way, air circulates within the inner space (23) through the air hole (24), and the deflector (20) is rapidly cooled, thereby preventing damage to the parts due to overheating.

[0035] Additionally, the stop rod (30) according to the present invention is inserted into the guide hole (22) together with an elastic body (31), a conical tip (32) is formed at one end corresponding to the stop groove (10), and a cam head part (33) is provided at the other end.

[0036] The above cam head portion (33) is pressed by the cam rail portion (41) of the sleeve (40) described later to move the stop rod (30) in a straight line, and the conical tip (32) engages with the stop groove (10) by the straight movement of the stop rod (30) to restrain the collet chuck (2).

[0037] Additionally, the elastic body (31) is compressed when the stop rod (30) is pressed by the cam rail part (41) and moves toward the stop groove (10), and is configured so that when the pressing force by the cam rail part (41) is released, the stop rod (30) returns to its original position due to the restoring force of the elastic body (31).

[0038] Additionally, the sleeve (40) according to the present invention is inserted into the outer surface of the deflector (20) and installed to be rotatable, and a cam rail portion (41) is formed on the inner surface corresponding to the cam head portion (33), and is configured so that when rotated, the cam rail portion (41) presses the cam head portion (33) toward the stop groove (10).

[0039] The sleeve (40) is inserted into the outer surface of the deflector (20) and is constrained by a snap ring (42) that is fastened to the outer surface of the deflector (20), and an O-ring (43) is inserted and installed on the inner surface of the sleeve (40).

[0040] At this time, the outer surface of the deflector (20) is protected by the sleeve (40), and an airtight seal is maintained between the outer surface of the deflector (20) and the inner surface of the sleeve (40) by the O-ring (43), thereby blocking the inflow of foreign matter and preventing malfunction caused by foreign matter. Additionally, resistance in the rotational direction of the sleeve (40) is generated due to frictional resistance between the O-ring (43) and the outer surface of the deflector (20), thereby preventing free rotation of the sleeve (40).

[0041] Additionally, the cam rail section (41) includes an unlock rail section (41a) that is formed in a recessed portion with a diameter expanded relative to the inner diameter of the sleeve (40) to accommodate the cam head section (33), and a locking rail section (41b) that is formed at an inclined angle to connect the unlock rail section (41a) and the inner surface of the sleeve (40) to press the cam head section (33) toward the stop groove (10).

[0042] In operation, when the cam head part (33) is positioned in the unlock rail section (41a) by the rotation angle of the sleeve (40) as in Fig. 2, the stop rod (30) is extended and transferred toward the sleeve (40), and the conical tip (32) and the stop groove (10) are unlocked.

[0043] And, as shown in FIG. 3, when the cam head part (33) is pressed toward the stop groove (10) in the locking rail section (41b) by the rotational movement of the sleeve (40), the conical tip (32) is engaged with the stop groove (10) to perform a locking operation.

[0044] When the cam head part (33) contacts the inner surface of the sleeve (40) by the rotational movement of the sleeve (40), the conical tip (32) engages with the stop groove (10) to maintain a locked position.

[0045] In this way, the linear movement of the stop rod (30) is controlled by a simple operation of rotating the sleeve (40), and the conical tip (32) engages with the stop groove (10) to maintain a locked position, so that anyone can easily unlock the collet chuck (2) with one hand and quickly replace the grinding member.

[0046] In addition, a stop pin (44) is installed on the outer surface of the deflector (20) corresponding to the unlock rail section (41a).

[0047] In addition, the stop pin (44) is provided to be accommodated within the unlock rail section (41a) to limit the rotational movement angle of the sleeve (40), thereby effectively preventing malfunction caused by excessive rotational operation of the sleeve (40).

[0048] In FIG. 4, the stop home (10) is provided to correct the posture to an angle corresponding to the conical tip (32) by an angle correction module (50).

[0049] The angle correction module (50) comprises an outer rail (51) formed in a recessed section along the outer surface of the deflector (20), an inclined rail (52) connected to one end of the outer rail (51) and having the other end penetrate into the deflector (20) at an inclined angle, and a push piece (53) received in the outer rail (51) and the inclined rail (52), having one end connected to the inner surface of the sleeve (40) and the other end protruding into the deflector (20).

[0050] At this time, the above-mentioned mill piece (53) is formed of a flexible material and is configured to move along the outer rail (51) and the inclined rail (52).

[0051] In operation, when the sleeve (40) is rotated to lock the collet chuck (2), as shown in FIG. 4, the push piece (53) is protruded and transported along the outer rail (51) and inclined rail (52) in conjunction with the rotational movement of the sleeve (40), and the outer surface of the collet chuck (2) is pressed at an eccentric position to correct the posture of the collet chuck (2) in the rotational direction. During this process, the cam head part (33) is pressed in the locking rail section (41b) so that the conical tip (32) and the stop groove (10) engage at an angle that matches each other to lock the collet chuck (2).

[0052] Accordingly, even if the stop rod (30) is pressure-transported by the locking rail section (41b) in a position where the conical tip (32) and the stop groove (10) are misaligned, the collet chuck (2) is rotated by the angle correction module (50), and the conical tip (32) and the stop groove (10) are corrected to an angle that matches each other, thereby having the advantage of being connected.

[0053] As described above, the detailed description of the present invention has explained the most preferred embodiment of the present invention, but various modifications are possible within the scope of the technical scope of the present invention. Accordingly, the scope of protection of the present invention should not be limited to the above embodiment, but should be recognized to include the technologies of the claims described below and equivalent technical means derived from these technologies.

[0054]

[0055] 10: Stop Home

[0056] 20: Deflector

[0057] 30: Stopload

[0058] 40: Sleeve

[0059] 50: Angle correction module

Claims

1. A stop groove (10) provided on the outer surface of a collet chuck (2) of a die grinder (1); a deflector (20) formed in a cylindrical shape to surround the outer surface of the collet chuck (2), having a connector (21) installed at one end to be mounted to the main body of the die grinder (1), and having a guide hole (22) formed at a position corresponding to the stop groove (10); a stop rod (30) inserted together with an elastic body (31) into the guide hole (22), having a conical tip (32) formed at one end corresponding to the stop groove (10), and having a cam head part (33) provided at the other end; and a sleeve (40) inserted into the outer surface of the deflector (20) and rotatably installed, having a cam rail part (41) formed on the inner surface corresponding to the cam head part (33), and configured such that the cam rail part (41) presses the cam head part (33) toward the stop groove (10) when rotated. The above cam rail section (41) includes an unlock rail section (41a) that is formed in a recessed shape in a predetermined section with a diameter expanded relative to the inner diameter of the sleeve (40) to accommodate the cam head section (33), and a locking rail section (41b) that is formed at an inclined angle to connect the unlock rail section (41a) and the inner surface of the sleeve (40) to press the cam head section (33) toward the stop groove (10). When the cam head part (33) is positioned in the unlock rail section (41a) by the rotation angle of the sleeve (40), the stop rod (30) is extended and transported toward the sleeve (40), causing the conical tip (32) to unlock the stop groove (10); when the cam head part (33) is pressed toward the stop groove (10) in the locking rail section (41b) by the rotational movement of the sleeve (40), the conical tip (32) engages with the stop groove (10) and locks; and when the cam head part (33) contacts the inner surface of the sleeve (40) by the rotational movement of the sleeve (40), the conical tip (32) engages with the stop groove (10) and maintains a locked position. The above stop home (10) is provided to correct the posture to an angle corresponding to the conical tip (32) by an angle correction module (50), and The angle correction module (50) comprises an outer rail (51) formed in a recessed section along the outer surface of the deflector (20), an inclined rail (52) connected to one end of the outer rail (51) and having the other end penetrate into the deflector (20) at an inclined angle, and a push piece (53) received in the outer rail (51) and the inclined rail (52), having one end connected to the inner surface of the sleeve (40) and the other end protruding into the deflector (20). When the sleeve (40) is rotated to lock the collet chuck (2), the push piece (53) is protruded and transported along the outer rail (51) and the inclined rail (52) in conjunction with the rotational movement of the sleeve (40) toward the inside of the deflector (20), thereby pressing the outer surface of the collet chuck (2) at an eccentric position to correct the position of the collet chuck (2) in the rotational direction. A grinding member replacement device for a die grinder, characterized in that the cam head part (33) is pressed in the locking rail section (41b) so that the conical tip (32) and the stop groove (10) engage at an angle that matches each other to perform a locking operation.

2. In Paragraph 1, The above deflector (20) is spaced apart from the main body of the grinder (1) to form an inner space (23), and a plurality of air holes (24) are formed through it so as to be parallel to the rotation axis of the collet chuck (2), and is configured so that air circulates to the outside within the inner space (23) through the air holes (24), characterized by a grinding member replacement device for a die grinder.

3. In Paragraph 1, The sleeve (40) is inserted into the outer surface of the deflector (20) and is constrained by a snap ring (42) that is fastened to the outer surface of the deflector (20), and an O-ring (43) is inserted and installed on the inner surface of the sleeve (40). The O-ring (43) above maintains airtightness between the outer surface of the deflector (20) and the inner surface of the sleeve (40), and A grinding member replacement device for a die grinder, characterized by being configured such that rotational resistance of the sleeve (40) is generated due to frictional resistance between the O-ring (43) and the outer surface of the deflector (20).

4. In Paragraph 1, A stop pin (44) is installed on the outer surface of the deflector (20) corresponding to the unlock rail section (41a) above, and A grinding member replacement device for a die grinder, characterized in that the above stop pin (44) is received within the unlock rail section (41a) to limit the rotational movement angle of the sleeve (40).

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