Screwdriver

• US 6,089,133 A
• Filed: 08/11/1999
• Issued: 07/18/2000
• Est. Priority Date: 08/11/1999
• Status: Expired due to Fees

• Current Assignee: Liao, Youn Chyuan
• Original Assignee: Liao, Youn Chyuan
• Inventors: Liao, Youn Chyuan
• Primary Examiner(s): Scherbel, David A.
• Assistant Examiner(s): Shakeri, Hadi
• Application Number:
  US09/371,960
• Time in Patent Office: 342 Days
• Field of Search: 81/436, 81/438, 81/439, 81/177.5, 81/73, 81/489
• US Class Current: 81/438
• CPC Class Codes: B25B 15/02 operated by rotating the handle
• CPC Class Codes: B25B 23/0021 Prolongations interposed between handle and tool
• CPC Class Codes: B25G 1/005 for screwdrivers, wrenches or spanners with additional levers, e.g. for increasing torque
• CPC Class Codes: B25G 1/007 of crank type
• CPC Class Codes: B25G 1/043 for screwdrivers, wrenches or spanners

Abstract

The present invention is related to a screwdriver in which a shaft lever with polygon socket is inserted into the central hole of the screwdriver handgrip so that a turning shaft to facilitate force application is plugged from the rear end of the handgrip into the socket in order to perform a rapid rotation of the shaft lever; the other end of the shaft lever can be connected to a extension shaft to be in a coupled state while an application shaft for screwdriver head can be plugged into the inner hole of the extension shaft, and the screwdriver head is inserted into the socket of the application end of the application shaft to perform screwing, wherein the application shaft for screwdriver head can be designed to be section-type, and the application shaft can be stretched inside of the connection inner hole of the extension shaft and shaft lever by means of an engaging member fitted to the outer circumference of the extension shaft so that the exposing length is adjustable; in addition, a freely turning sleeve can be mounted between the handgrip and the extension shaft to be a holding supporting point in performing a rapid screwing.

Claims

1. A screwdriver comprising a shaft lever with an axial polygon socket around which a turning sleeve is mounted at one end thereof in which an extension shaft with an inner hole is so plugged that said socket of said shaft lever and said inner hole of said extension shaft are connected with each other, and the other end of said shaft lever is plugged into one end of a handgrip, and said shaft lever is connected to said other end of said handgrip by means that a male thread at said other end of said shaft lever is screwed with a female thread of a locating turning cover at the other end of said handgrip, and a U-shaped turning shaft with two bending ends and a plug shaft to facilitate the force application can be plugged into said socket of said shaft lever at the end of said handgrip, the two bending ends of said U-sahped turning shaft each are pivoted with a turning sleeve respectively, and one end of said extension shaft is fitted with an engaging member to be connected with a section-type application shaft for screwdriver head so that said application shaft can be retraced to and extended from inside of said connecting inner hole of said extension shaft and said shaft lever and it exposing length is therefore adjustable.

2. A screwdriver comprising:

a shaft lever having an axial polygon socket in one end of which a application shaft for screwdriver head is plugged while the other end is open, and one side of its outer circumference having an engaging edge while a neighbored side being a smooth mounting sleeve having a reception member with an engaging shaft at one side thereof, and one side of said reception member having a male thread part;

a turning sleeve having a smooth inner hole to be pivoted in said mounting sleeve of said shaft lever to be in a pivoted connection state;

a handgrip having a borehole with engaging groove for fastening it at the position of said reception member of said shaft lever;

a locating turning cover having a female thread hole for screwing with said male thread part of said shaft lever in order to place said turning sleeve and said handgrip in position; and

a U-shaped turning shaft having two bending ends to facilitate the force application and having an axial plug shaft at the center thereof while a turning sleeve is pivoted with a locating part at the two bending ends.

3. A screwdriver comprising:

a shaft lever having a axial polygon socket one end of which is plugged into an extension shaft with a polygon inner hole so that said socket and said inner hole of said extension shaft are connected with each other while the other end of said shaft lever is open having an engaging edge on its outer circumference thereof while a neighbored side being a smooth mounting sleeve having a reception member with engaging shaft at one side thereof, and one side of said reception member having a male thread part;

a handgrip having a borehole with engaging groove fastening it at the position of said reception member of said shaft lever;

a locating turning cover having a female thread hole for screwing with said male thread part of said shaft lever in order to place said handgrip in position;

a U-shaped turning shaft having two bending ends to facilitate the force application and having an axial plug shaft at the center thereof while a turning sleeve is pivoted with a locating part at the two bending ends; and

an engaging turning sleeve fitted to one end of said extension shaft to be connected with a section-type application shaft for screwdriver head so that said application shaft can be retracted to and extended from inside of said socket of said shaft lever and its exposing length is therefore adjustable.