Power tool housing

A technology for power tools and casings, applied in the field of transmission casings, can solve problems such as reducing battery life and reducing hammer drill efficiency, and achieve the effect of reducing energy

Inactive Publication Date: 2006-06-28
BLACK & DECKER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of prior art hammer drills is that when the hollow piston is reciprocated by the hammer drill drive, the free end of the hollow piston repeatedly compresses the air enclosed within the hammer drill.
This unnecessary work against the enclosed air will reduce the efficiency of the hammer drill and, for battery powered hammer drills, reduce the life of the battery

Method used

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Examples

Experimental program
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Embodiment Construction

[0062]3, a battery-powered hammer drill includes a tool housing 22 and a chuck 24 for fixing a drill bit (not shown). The tool housing 22 is formed with a handle 26 having a trigger 28 for starting the hammer drill 20. The battery pack 30 is detachably connected to the bottom of the tool housing 22. The setting mode selection knob 32 is used to select between the hammer only mode, the rotation only mode and the hammer rotation combination mode of the drill operation.

[0063] Referring to FIG. 4, the motor 34 is provided in the tool housing 22 and has a rotating output shaft 36. A pinion gear 38 is formed at the end of the output shaft 36, and the pinion gear 38 meshes with the first drive gear 40 of the rotation drive mechanism and the second drive gear 42 of the hammer drive mechanism.

[0064] The rotation drive mechanism is described as follows. The first bevel gear 44 is driven by the first drive gear 40. The first bevel gear 44 meshes with the second bevel gear 46. The secon...

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PUM

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Abstract

A drive mechanism for a hammer drill comprises a hollow piston 558 having a cylindrical bearing that receives a crank pin in order to cause the hollow piston 558 to reciprocate inside a spindle, Figure 25, 548. A plurality of longitudinal ridges 559 are formed on the outer surface of the hollow piston 558 to reduce the surface area of contact between the hollow piston 558 and the spindle, Figure 25, 548, and a plurality of grooves 561 are formed in the gaps between the ridges. The grooves 561 retain lubricant 558 in order to reduce frictional contact between the hollow piston 558 and the spindle Figure 25, 548.

Description

Technical field [0001] The invention relates to a transmission housing for a power tool and a power tool equipped with the transmission housing. The present invention particularly, but not exclusively, relates to a transmission housing for a hammer drill and a hammer drill equipped with such a transmission housing. Background technique [0002] A hammer drill is a power tool that can generally be operated in three modes of operation. The hammer drill has a cutter head capable of working in a hammering mode, a rotating mode, and a combined mode of impact rotation. [0003] In order to generate an impact action, a hammer drill usually has a hollow piston that is caused to reciprocate by the transmission mechanism of the hammer drill. The disadvantage of the prior art hammer drill is that when the hollow piston is reciprocated by the hammer drill transmission mechanism, the free end of the hollow piston repeatedly compresses the air enclosed in the hammer drill. This unnecessary wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25F5/02B23B45/16B25D16/00B25D17/24B25F5/00
CPCB25D16/00B25D17/24B25D2211/003B25D2250/245B25F5/008B25D11/125B25D16/006B25D17/26B25F5/001B25F5/006B25F5/02B25D11/005B25D11/12
Inventor 克劳斯-迪特尔·阿里希埃哈德·本纳曼弗雷德·德罗斯特乌韦·内梅茨马丁·左伊卡米夏埃尔·G·孔茨
Owner BLACK & DECKER INC
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