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Automatic shaft locking mechanism

A shaft locking and locking pin technology, applied in the field of automatic locking mechanisms, can solve problems such as excessive value, damage to power tools, damage, etc., and achieve the effect of avoiding pollution

Inactive Publication Date: 2004-03-31
BLACK & DECKER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of these mechanisms have inherent disadvantages in that the magnitude of the manually applied reverse torque may damage or destroy the shaft locking mechanism of the power tool.

Method used

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Examples

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Embodiment Construction

[0021] Figures 1 to 8 depict only a preferred embodiment (ie, a variation of the embodiment) of the present invention, which is applied to power-driven tools such as electric drills. However, those of ordinary skill in the art will readily appreciate that the principles and features of the present invention are equally applicable to many other profiled power driven tools, including those conventional "power screw driven tools".

[0022] In FIG. 1, a power tool 10 includes a housing 12 in which an electric motor 14 and a drive mechanism 18 are provided for transmitting power from the electric motor 14 to a chuck 16 adapted to drive and clamp a knife bit drivers, drill bits or other such rotating tool bits.

[0023] Referring to FIGS. 1-4 , the driving mechanism 18 includes a rotor shaft 22 of the motor 14 , preferably the rotor shaft 22 is rotatably supported in a bearing disc 24 fixedly installed in the tool housing 12 . The bearing disc 24 preferably includes a first bearing...

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PUM

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Abstract

An automatic shaft lock is incorporated into the transmission or drive components of a power driving tool of the type commonly used to tighten or loosen threaded fasteners, for example. The automatic shaft lock operates to prevent an externally-applied rotational back-force or back-torque, such as results from use of the tool to manually tighten or loosen a fastener, from being transmitted all the way through the drive components to the tool's motor or armature shaft. The shaft lock also effectively reduces the amount of back-torque, functioning automatically in either rotational direction, due to being disposed at an intermediate location in the drive train, between an intermediate gear enmeshed for driving rotation with the tool's armature shaft and an output gear enmeshed in a driving relationship with the tool's output shaft.

Description

technical field [0001] The present invention generally relates to automatic locking mechanisms for powered drive shafts. The invention is particularly suitable for use with power tools, especially those widely used manually, such as driving screws for clamping workpieces. Background technique [0002] Power tools, such as power screw drivers, nut drivers and other clamping drivers, have been widely used to tighten workpieces with power-driven screw clamps, or to drive one screw clamp into another. Sometimes, due to the size, length, or other conditions of the screw clamp, the power driven tool does not have sufficient torque to tighten (or loosen) the screw clamp, and thus cannot meet the user's requirements. In such cases, operators frequently use power-driven tools in non-powered or locked-rotor conditions in order to forcefully tighten the clamps by hand. Also, in some cases, in order to more accurately control the amount of torque ultimately ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B21/00B25F5/00
CPCB25B21/00B25F5/001
Inventor 小威廉·G·哈曼米歇尔·F·坎纳利亚托戴尔·K·惠勒
Owner BLACK & DECKER INC