POWER TOOL

• US 20120244788A1
• Filed: 02/21/2012
• Published: 09/27/2012
• Est. Priority Date: 03/23/2011
• Status: Abandoned Application

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: NUMATA, Fumitoshi
• Application Number:
  US13/401,308
• Publication Number:
  US 20120244788A1
• Time in Patent Office: Days
• US Class Current: 451/359
• CPC Class Codes: B24B 23/028 Angle tools
• CPC Class Codes: B24B 45/00 Means for securing grinding wheels on rotary arbors suppression of vibrations in systems F16F15/00; testing static or dynamic balancing of machines G01M1/00

Abstract

In a grinder, a spindle protruding from a main body including a brake device is provided with an inner member. The inner member contacts a pressing portion provided integrally with the spindle and is pressed toward a tip end of the spindle when the spindle is braked by the brake device. A nut member can be screwed on the tip end of the spindle so that a disc-like tool though which the spindle extends perpendicularly can be held between the inner member and the nut member. The inner member comprises a locking member that contacts the pressing portion and is pressed toward the disc-like tool when the brake device is operated, and an inner flange which is detachably attached to the locking member so as to be rotatable together with the locking member.

Claims

1. A power tool, comprising:

a main body;

a brake device provided in the main body;

a spindle protruding from the main body;

an inner member provided on the spindle;

a pressing portion provided integrally with the spindle;

a nut member that can be screwed on a tip end of the spindle; and

a disc-like tool though which the spindle extends perpendicularly so that the disc-like tool can be held between the inner member and the nut member, wherein

the inner member comprises a first inner member that contacts the pressing portion and is pressed toward the disc-like tool when the brake device is operated, and a second inner member through which the spindle extends is detachably attached to the first inner member and rotatable together with the first inner member, wherein the disc-like tool can be held between the second inner member and the nut member when the second inner member is attached to the first inner member.

2. The power tool according to claim 1, wherein

a width-across-flat portion parallel to a direction perpendicular to an axis of the spindle is provided on an outer periphery of the first inner member.

3. The power tool according to claim 1, wherein

the pressing portion is a pair of flange portions that are provided to protrude in a radial direction of the spindle at positions symmetrical with respect to an axis of the spindle, and the pair of flange portions has a pressing surface facing the first inner member,

while the first inner member has a fitting recess as a pressed surface in which the pair of flange portions is fitted with play so that the pressing surface of the pair of flange portions contacts a bottom of the fitting recess.

4. The power tool according to claim 3, wherein

the pressing surface is a pair of first tilted surfaces that form a predetermined angle with respect to a plane perpendicular to the axis, and

the pressed surface is a pair of second tilted surfaces that can contact the pair of first tilted surfaces with the pair of flange portions being fitted in the fitting recess.

5. The power tool according to claim 1, wherein

one of the first inner member and the second inner member has a protrusion that protrudes toward the other inner member, and the other inner member has a recess groove with and from which the protrusion can be engaged and disengaged, and

the first inner member can be attached to the second inner member by engaging the protrusion with the recess groove.