Invention Grant
US6131671A Power-driven tool having a mechanism for setting the rotary angle
position of a tool bit
失效
具有用于设定工具刀头的旋转角度位置的机构的动力驱动工具
- Patent Title: Power-driven tool having a mechanism for setting the rotary angle position of a tool bit
- Patent Title (中): 具有用于设定工具刀头的旋转角度位置的机构的动力驱动工具
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Application No.: US771972Application Date: 1996-12-23
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Publication No.: US6131671APublication Date: 2000-10-17
- Inventor: Mitsuyoshi Shibata , Masaaki Uchida
- Applicant: Mitsuyoshi Shibata , Masaaki Uchida
- Applicant Address: JPX
- Assignee: Makita Corporation
- Current Assignee: Makita Corporation
- Current Assignee Address: JPX
- Priority: JPX7-337504 19951225
- Main IPC: B23Q3/12
- IPC: B23Q3/12 ; B23B45/16 ; B25D11/04 ; B25D17/08 ; B25F5/00 ; E02D7/02
Abstract:
A power-driven hammer has a tool holder a middle bore portion which is supported inside a housing and urged backward by a compression spring. The rear end of a large bore portion of the tool holder is slidably fitted into a spline ring which is secured to the front end of a middle housing. Spline grooves are formed in the inner periphery of the spline ring at its front end while spline gears are formed on the outer periphery of the large bore portion. When the spline grooves and the spline gears are engaged with each other, the tool holder, being urged backward, is locked with its rotation prohibited. This tool holder can be temporarily unlocked to allow its rotation by sliding a change ring cover forward and the tool holder itself, thereby disengaging the large bore portion from the spline ring.
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