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CN-115194645-B - Power tool

CN115194645BCN 115194645 BCN115194645 BCN 115194645BCN-115194645-B

Abstract

The invention provides a tool. The power tool includes a motor that supplies a driving force to the tip tool, a braking mechanism that is disposed on a driving force transmission path from the motor to the tip tool and that brakes driving of the tip tool, at least one mounting portion that removably mounts the accessory, and a restricting member that is directly or indirectly pushed by the accessory to be displaced when the accessory is mounted on any one of the at least one mounting portion. The restricting member is located at a blocking position that blocks the release of the braking state of the operation braking mechanism by the abutment between the members in a state where the accessory is not mounted on any one of the at least one mounting portion, and is located at a permitting position that permits the release of the operation braking state by the abutment between the members in a state where the accessory is mounted on any one of the at least one mounting portion. Therefore, the power tool with the detachable accessories is improved.

Inventors

  • Saito Shijia
  • Doudo Shinichi

Assignees

  • 株式会社牧田

Dates

Publication Date
20260508
Application Date
20220128
Priority Date
20210413

Claims (11)

  1. 1. A power tool is characterized by comprising a motor, a braking mechanism, a plurality of mounting parts and a limiting component, wherein, The motor is configured to provide a driving force to the tip tool; the braking mechanism is disposed on a driving force transmission path from the motor to the tip tool, and configured to brake driving of the tip tool; the plurality of mounting parts are configured to detachably mount the fitting; The regulating member is configured to be directly or indirectly pushed by the fitting to be displaced when the fitting is mounted on any one of the plurality of mounting portions, In a state where the fitting is not mounted on any one of the plurality of mounting portions, the restricting member is located at a blocking position, which is a position where the braking state of the brake mechanism is blocked by the inter-member abutment to be released, In a state where the fitting is mounted on any one of the plurality of mounting portions, the restricting member is located at an allowable position, which is a position where the release operation of the braking state is allowed because the inter-member abutment is not generated, The restricting member is a single member provided in common to the plurality of mounting portions.
  2. 2. A power tool is characterized by comprising a motor, a braking mechanism, at least one mounting part, a limiting part and an intermediate part, wherein, The motor is configured to provide a driving force to the tip tool; the braking mechanism is disposed on a driving force transmission path from the motor to the tip tool, and configured to brake driving of the tip tool; the at least one mounting portion is configured to removably mount the accessory; The regulating member is configured to be directly or indirectly pushed by the fitting to be displaced when the fitting is mounted on any one of the at least one mounting portion; The intermediate member is configured to be displaced by being pressed by the fitting when the fitting is mounted on any one of the at least one mounting portion, In a state where the fitting is not mounted on any one of the at least one mounting portion, the restricting member is located at a blocking position, which is a position where the braking state of the brake mechanism is blocked by the inter-member abutment to be released, In a state where the fitting is mounted on any one of the at least one mounting portions, the restricting member is located at an allowable position, which is a position where the release operation of the braking state is allowed because the inter-member abutment is not generated, The regulating member is further configured to be pushed by the intermediate member to be displaced when the fitting is mounted on any one of the at least one mounting portion.
  3. 3. The power tool of claim 2, wherein the power tool comprises a housing, The at least one mounting portion has a plurality of mounting portions.
  4. 4. The power tool of claim 3, wherein the power tool comprises a housing, The restricting member is a single member provided in common to the plurality of mounting portions.
  5. 5. The power tool according to claim 1 or 4, wherein, The plurality of mounting portions includes a1 st mounting portion and a 2 nd mounting portion, The allowable positions include a1 st allowable position and a2 nd allowable position, The restricting member is configured to: When the fitting is mounted on the 1 st mounting portion, the restricting member is displaced from the blocking position to the 1 st allowable position in the 1 st direction, When the fitting is mounted on the 2 nd mounting portion, the restricting member is displaced from the blocking position to the 2 nd allowable position in a direction opposite to the 1 st direction.
  6. 6. The power tool of claim 1, wherein the power tool comprises a housing, And an intermediate member configured to be pushed and displaced by the fitting when the fitting is mounted on any one of the plurality of mounting portions, The regulating member is configured to be pushed by the intermediate member to be displaced when the fitting is mounted on any one of the plurality of mounting portions.
  7. 7. The power tool according to any one of claims 1 to 4 and 6, wherein, The motor has a motor shaft that is coupled to the motor, The power tool further has a final output shaft configured to transmit the driving force from the motor shaft and to mount the tip tool, The braking mechanism is disposed around the motor shaft.
  8. 8. The power tool of claim 7, wherein the power tool comprises a power tool housing, The braking mechanism has a braked member, a braking member, a biasing member, and a brake release member, The braked member is fixed to the motor shaft and is configured to circumferentially surround the motor shaft; The braking member is configured to be pressed against the member to be braked to achieve the braking state, and is arranged between a braking position in contact with the member to be braked and a non-braking position separated from the member to be braked in a displaceable manner; the force application member applies force to the braking member to the braking position; The brake release member is configured to displace the brake member by pressing the brake member from the braking position to the non-braking position against the biasing force of the biasing member.
  9. 9. The power tool of claim 8, wherein the power tool further comprises a power source, And also has a switch and an operating member, wherein, The switch is used for driving the motor; The operating member is configured to be displaceable between an off position in which the switch is turned off and an on position in which the switch is turned on, The brake release member is configured to be interlocked with displacement of the operating member between the off position and the on position.
  10. 10. The power tool of claim 9, wherein the power tool comprises a power tool housing, And a link member configured to be interlocked with displacement of the operating member between the off position and the on position, The link member is configured to displace when the operating member is displaced from the off position to the on position, thereby pressing the switch so as to bring the switch into the on state and pressing the brake release member so as to release the brake state.
  11. 11. The power tool of claim 8, wherein the power tool further comprises a power source, Further comprises a switch, an operating part and a locking part, wherein, The switch is used for driving the motor; the operating member is configured to be displaceable between an off position in which the switch is turned off and an on position in which the switch is turned on; The lock portion is configured to be capable of switching the operating member between a lock state, in which the operating member is prevented from being displaced from the off position to the on position, and a unlock state, in which the operating member is allowed to be displaced from the off position to the on position, by changing an engagement state with the operating member, The brake release member is configured to be interlocked with an operation for switching between the lock state and the lock release state.

Description

Power tool Technical Field The present invention relates to a power tool. Background Various accessories are sometimes removably mounted to the power tool. For example, in a grinder having a tip tool configured to be rotationally driven, a cover (also referred to as a wheel cover, a disc cover, a blade housing, or the like) for covering a part of the tip tool and a side handle (SIDE HANDLE) for holding the grinder with one hand while holding the handle with the other hand are prepared as detachable accessories. In such a grinder, it is required to prevent the grinder from being used in a state where no accessory is mounted. For example, patent document 1 below discloses a grinder having a sensor for detecting whether a cover is attached or not, and a controller for prohibiting rotation of a tip tool when the cover is not attached. Further, patent document 2 below discloses a grinder having a sensor for detecting whether a cover is attached or not and a sensor for detecting whether a side handle is attached or not. Patent document 3 below discloses a grinder having a blocking member that is displaced according to the presence or absence of a fitting. In this grinder, in a state where no accessory is attached, a mechanical element engaged with an operation member for turning on a switch is abutted against a blocking member, thereby preventing the operation member from moving to an on position. [ Prior Art literature ] [ Patent literature ] Patent document 1 International publication No. 2017/051893 Patent document 2 U.S. patent application publication No. 2018/272494 specification Patent document 3 U.S. patent application publication No. 2018/0326554 specification Disclosure of Invention [ Problem to be solved by the invention ] However, there is room for improvement in the above-described techniques. For example, in the techniques described in patent documents 1 and 2, when the sensor fails and when the sensitivity of the sensor is lowered due to the adhesion of dust, the attachment of the cover and the side handle may not be detected. In addition, in the technique described in patent document 3, since the displacement of the operation member is limited only when the attachment is not attached, there is room for improvement in that the driving of the tip tool is more reliably limited. These points are not limited to grinders and are common to power tools with removable accessories. [ Solution for solving the problems ] The present specification discloses a power tool. The power tool may include a motor configured to supply a driving force to the tip tool, a brake mechanism disposed on a driving force transmission path from the motor to the tip tool and configured to brake driving of the tip tool, at least one attachment portion configured to detachably attach the accessory, and a restricting member configured to be directly or indirectly pushed by the accessory to be displaced when the accessory is attached to any one of the at least one attachment portion. The restriction member may be located at a blocking position for blocking release of the braking state of the operation braking mechanism by abutment between the members in a state where the attachment is not mounted on any one of the at least one mounting portion, and may be located at a permission position for permitting release of the operation braking state by no abutment between the members in a state where the attachment is mounted on any one of the at least one mounting portion. According to this power tool, a structure in which the tip tool can be driven only when the accessory is mounted can be realized only by a mechanical structure without using a sensor. When the fitting is not attached, the brake state of the operation brake mechanism is prevented from being released by the restricting member. That is, the power tool is held in a state where the brake is applied. In other words, the tip tool is in a forced stopped state irrespective of the on/off state of the switch for driving the tip tool. Therefore, when the accessory is not mounted, the driving of the tip tool can be more reliably restricted. Drawings Fig. 1 is a longitudinal sectional view of the grinder according to embodiment 1 of the present invention, which is a view of fig. 2 A-A, without a side handle attached thereto, and with the tip tool in a braked state, and with the operating member in a disconnected position. Fig. 2 is a cross-sectional view of the grinder of B-B of fig. 1. Fig. 3 is a partial cross-sectional view of the grinder of fig. 1C-C. Fig. 4 is a partial cross-sectional view of the grinder of D-D of fig. 1. Fig. 5 is a longitudinal section of the grinder of fig. 1E-E. Fig. 6 is a longitudinal sectional view of the grinder of F-F of fig. 1. Fig. 7 is an enlarged view of a portion of the grinder shown in fig. 1. Fig. 8 is a perspective view of the restricting member. Fig. 9 is a perspective view of the intermediate member. Fig. 10 is a longitudinal section of the grind