REPLACEABLE ADAPTER FOR AN ELECTRIC HAND TOOL

• US 20070290458A1
• Filed: 06/15/2006
• Published: 12/20/2007
• Est. Priority Date: 06/15/2006
• Status: Abandoned Application

• Current Assignee: Ching-Cheng Chuang
• Original Assignee: Ching-Cheng Chuang
• Inventors: CHUANG, SHUN-YUAN
• Application Number:
  US11/424,366
• Publication Number:
  US 20070290458A1
• Time in Patent Office: Days
• US Class Current: 279/143
• CPC Class Codes: B25F 3/00 Associations of tools for different working operations with one portable power-drive means; Adapters therefor
• CPC Class Codes: Y10T 279/3406 Adapter

Abstract

A replaceable adapter for an electric hand tool, which is an electric screw driver or the like, includes an adapter seat, a clutch cap, a drill bit socket set and a joining sleeve disposed at the front end of the electric hand tool. The adapter seat extends an inner sleeve to fit with a bearing and the bearing is fixedly attached with a rotating shaft. The inner sleeve receives a compression spring. An end of the rotating shaft is joined to the output shaft of the electric hand tool. The adapter seat provides an inner annular projection at the bottom thereof and is surrounded with balls. The clutch cap has a cylindrical head inserts into the inner sleeve against biasing force of the compression spring. The cylindrical head provides an outer annular projection at the top thereof for engaging with the inner projection. An annular inner recess is disposed next to the cylindrical head. A drill bit socket set is joined to another end of rotating shaft. The joining sleeve has an annular outer recess at the outer surface thereof. When the clutch cap is moved to press the bottom of the adapter seat, the balls move to enter the inner recess of the adapter seat such that the joining sleeve is admitted to slide into the adapter seat or to move outward the adapter seat. When the clutch cap is released from being pressed and moves backward due to the biasing force of the compression spring such that the engaging balls are squeezed by the inner wall surface of the cylindrical head and engage with the outer recess of the joining sleeve for the adapter seat engaging with joining sleeve of the electric hand tool.

Claims

1. A replaceable adapter for an electric hand tool, which is an electric screw driver or the like, comprising

an adapter seat, extending an inner sleeve therein to form a hollow section and a spring receiving section, the hollow section being available for fitting with a bearing, the bearing being fixedly attached with a rotating shaft, an end of the rotating shaft extending outward to form a pivotal part, another end of the rotating shaft being a hexagon end to fit with a hexagon bore provided at the front end of an output shaft of the electric hand tool, the spring receiving section receiving a compression spring, the bottom of the adapter seat providing an inner annular projection, and the inner sleeve being surrounded with a plurality of balls at the bottom of the inner wall surface thereof;

a clutch cap, having a cylindrical head extending from the top thereof to insert into the spring receiving section against biasing force of the compression spring, an outer end of the cylindrical head providing an outer annular projection corresponding to the inner annular projection, an outer annular recess being disposed next to the inner wall surface of the cylindrical head;

a drill bit socket set, being a chuck for clamping a drill bit and being joined to the pivotal part of the rotating shaft; and

a joining sleeve, being disposed at the front end of the electric hand tool with an annular outer recess surrounded with the outer surface thereof and the output shaft passing through therefrom for fitting with;

wherein, when the clutch cap is moved to press the bottom of the adapter seat, the engaging balls move to enter the inner recess of the adapter seat such that the joining sleeve is admitted to slide into the adapter seat or to move outward the adapter seat;

when the clutch cap is released from being pressed and moves backward due to the biasing force of the compression spring such that the engaging balls are squeezed by the inner wall surface of the cylindrical head instead of engaging with the inner recess and engage with the outer recess of the joining sleeve for the adapter seat engaging with joining sleeve of the electric hand tool.

2. The replaceable adapter for an electric hand tool as defined in claim 1, wherein the joining sleeve integrally extends from the front end of the electric hand tool.

3. The replaceable adapter for an electric hand tool as defined in claim 1, wherein the joining sleeve has internal threads at an end thereof to engage with the front end of the electric hand tool.