Power hand tool

a hand tool and hand-held technology, applied in the field of hand tools, can solve the problems of user's inability to see the indication of the respective index sign well, accidental injury, and work mistak

Inactive Publication Date: 2007-05-31
MOBILETRON ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a power hand tool that allows the user to see the gearshift position clearly in the dark. It includes a housing with a through hole and a sighthole, a motor, a multi-step speed changer, and an indicator. The speed changer has a gear set and a transmission mechanism with index signs that move to the sighthole based on the gearshift positions. The indicator has a light emitting device that illuminates one of the index signs. The technical effect of this invention is to provide a convenient and safe tool for users who need to adjust gearshift positions in the dark.

Problems solved by technology

However, one may work with a power hand tool in the night or under a dark environment.
When working in the night or under a dark environment, the user may be unable to see the indication of the respective index sign well.
If the user directly uses the power hand tool that is shifted to a wrong gearshift position (wrong revolving speed), a working mistake or accidental injury may occur.

Method used

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Examples

Experimental program
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Embodiment Construction

[0012] Referring to FIGS. 1-4, a power hand tool in accordance with a preferred embodiment of the present invention is shown comprising a housing 10, a motor 20, a multi-step speed changer 30, an indicator 40, and a battery pack 50.

[0013] The housing 10 has a through hole 11 and a sighthole 12 at one side, for example, the top side. Further, the housing 10 defines therein a plurality of receiving chambers.

[0014] The motor 20 is fixedly mounted inside the housing 10, having a power output end for output of a rotary driving force to the outside.

[0015] The multi-step speed changer 30 comprises a speed changing gear set 31 and a transmission mechanism 32. The speed changing gear set 31 is mounted inside the housing 10 and coupled to the power output end of the motor 20 for selectively changing the rotary driving force (constant revolving speed) to different revolving speeds (because this speed changing gear set is of the known art, no further detailed description in this regards is n...

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PUM

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Abstract

A power hand tool includes a housing containing a motor, a speed changing gear set coupled to the power output end of the motor, a transmission mechanism coupled to the speed changing gear set and partially extending out of the housing for operation by the user to selectively shift the speed changing gear set to one of a series of gearshift positions thereof, a set of index signs marked on the transmission mechanism corresponding to the series of gearshift positions and alternatively moved to a sighthole in the housing subject to the gearshift position of the speed changing gear set, and a light emitting device mounted in the housing adjacent to the sighthole for illuminating one index sign of the transmission mechanism that is in alignment with the sighthole.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a hand tool and more particularly, to a power hand tool having a transmission position indicator (gearshift position indicator) that can be recognized clearly. [0003] 2. Description of the Related Art [0004] Regular power hand tools are commonly provided with a multi-step speed changer (transmission) that is controllable to change the revolving speed of the output shaft subject to different working requirements. [0005] The multi-step speed changer of a conventional power hand tool has an operating knob disposed at one side for operation by the user to change the gearshift position. The operating knob has marked thereon index signs, for example, H for high speed, M for standard speed and L for low speed, or a series of numerical signs such as 1, 2, 3, etc. for indicating the current gearshift position. However, one may work with a power hand tool in the night or under a dark environme...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): E21B19/16
CPCB25F5/001
InventorLIN, YUNG-TSUNG
OwnerMOBILETRON ELECTRONICS