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Power tool torque overload clutch

An overload clutch, power tool technology, applied in the field of torque overload clutch, power tools, can solve the problem of damage height, drive chain gearbox shift, wear and so on

Inactive Publication Date: 2012-01-25
BLACK & DECKER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in units that operate without a clutch, the motor may stall, or components of the drive chain or gearbox may become dislodged, causing damage or high wear on themselves or other mechanisms

Method used

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  • Power tool torque overload clutch
  • Power tool torque overload clutch
  • Power tool torque overload clutch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Hammer drills often have a gearbox with a gear change mechanism therein. The power tool can be configured to output at two or more rotational speeds, depending on the requirements of the user and / or the needs of the job being performed. In general, the clutch can be arranged on an intermediate shaft in the gearbox, which is disposed between the motor shaft and the output shaft. However, gear reduction usually affects the torque at which the clutch mechanism operates. In other words, the predetermined torque at which the clutch is engaged to interrupt drive from the motor will depend on whether the drill is operating at a higher or lower speed; this depends on the gear ratio used by the tool. This problem seems to be overcome by having a clutch between the gearbox and the output shaft, so that power from the motor is interrupted at the output shaft. However, providing a clutch mechanism on the output shaft of a hammer drill is known to cause problems, particularly beca...

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PUM

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Abstract

A torque overload clutch for an electrical power tool, such as a percussion hammer drill, is provided. The clutch is accommodated in a cavity in a gear cog. Spring washers are used to urge ball bearings into indentations formed in the base of the cavity. The ball bearings are accommodated in cavities formed in a drive plate which engages with the spindle drive of the power tool. The spring washers are held in position by a circlip or a threaded plate. The threaded plate arrangement provides means for compressing the spring washers with a consistent force across a manufactured batch. A method of manufacturing the clutch is also disclosed.

Description

technical field [0001] The present invention relates to an overload clutch, especially suitable for a torque overload clutch in a power tool, and more particularly, the present invention relates to a torque overload clutch used in an electric hammer drill. The invention also relates to a power tool comprising such a clutch mechanism. [0002] Embodiments of the invention are described below with reference to a hammer drill. However, the concept of the invention is not limited to this device and the clutch embodying the invention can equally be used in other power tools such as circular saws or grinders. Background technique [0003] During normal operation of a hammer drill, the bit rotates while the bit is subjected to repeated impacts. Such drills are often used for working with masonry or the like. The impact mechanism can be of the pneumatic or impact type as known in the art. Furthermore, the hammer drill can be configured to operate in a hammer-drill mode in which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q11/04B25D9/00B25D11/10F16D43/20B24B23/02F16D43/206F16H3/30B25D16/00F16D7/08B23D47/12F16D7/00B25F5/00
CPCF16H3/30B25D2250/321B25D2250/165F16D43/206B25D16/006B25D11/106B23D47/12B25D9/00F16D7/08B25D16/003B25F5/001B24B23/02B23B45/008B23Q11/04F16D13/76F16H3/22
Inventor 乔纳森·阿姆斯特朗
Owner BLACK & DECKER INC
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