Extension bar

Patent metadata

Field	Value
Publication number	US-9333631-B2
Application number	US-201514809339-A
Country	US
Kind code	B2
Filing date	Jul 27, 2015
Priority date	Jun 14, 2012
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

An extension bar includes a rod having an outer periphery thereof including a recess and a positioning track extended thereon. The recess defines a first contact section and a second contact section disposed after the first contact section longitudinally. A sleeve is slidably mounted on the rod and includes an orifice extended radially therethrough. A stopper is movably engaged with and disposed at a fixed predetermined position on the positioning track. A detent is engaged between the rod and the sleeve and movably engaged in the recess and the orifice. A biasing member is disposed between the sleeve and the stopper.

First claim

What is claimed is:

1. An extension bar adapted to releasably engage a driving member with a pneumatic tool in a quick manner, comprising:
a rod having a first end and a second end opposite to the first end adapted to engage with a pneumatic tool, with the rod extending from the first end to the second end along a first axis, with the rod having an outer periphery including a recess and a threaded positioning track extended thereon, with the recess defining a first contact section and a second contact section disposed after the first contact section longitudinally along the first axis;
a sleeve slidably mounted on the rod along the first axis and having an inner periphery thereof delimiting a bore extended therethrough receiving the first end of the rod and including an orifice extended radially therethrough into the bore;
a stopper threadedly engaged relative to the rod along the first axis and removably fixed at a fixed predetermined position along the first axis on the positioning track;
a detent engaged between the rod and the sleeve and movably engaged in the recess and the orifice; and
a biasing member engaging the sleeve and the stopper, wherein a resilient force from the biasing member between the rod and the sleeve is variable in response to the fixed predetermined position of the stopper relative to the rod along the first axis;
wherein the sleeve is operably movable against the biasing member to a first position with the detent partially extended out of the orifice and disposed on the first contact section of the recess, and a second position with the detent disposed on the second contact section of the recess.

2. The extension bar as claimed in claim 1 , wherein the biasing member is circumferentially extended along the outer periphery of the rod and not received in the sleeve, and wherein the biasing member includes a first end abutting an end of the sleeve and a second end abutting an end of the stopper.

3. The extension bar as claimed in claim 2 , wherein the biasing member has a shape including a plurality of coaxial loops.

4. The extension bar as claimed in claim 2 , wherein the first contact section has a first depth from the outer periphery of the rod, and the second contact section has a second depth from the outer periphery of the rod, with the second depth greater than the first depth.

5. The extension bar as claimed in claim 3 , wherein the first contact section has a first depth from the outer periphery of the rod, and the second contact section has a second depth from the outer periphery of the rod, with the second depth greater than the first depth.

6. The extension bar as claimed in claim 4 , wherein the biasing member extends longitudinally at a first length when the sleeve is in the first position thereof and at a second length when the sleeve is in the second position thereof, with the first length greater than the second length.

7. The extension bar as claimed in claim 5 , wherein the biasing member extends longitudinally at a first length when the sleeve is in the first position thereof and at a second length when the sleeve is in the second position thereof, with the first length greater than the second length.

8. The extension bar as claimed in claim 1 , wherein the rod, along the first axis, defines a first extension, a shoulder, and a second extension sequentially, wherein the first extension has a smaller cross section than the shoulder, wherein the shoulder and a section of the bore receiving the shoulder have corresponding shapes and are of non-circular sections so that the sleeve is prevented from rotating relative to the rod, wherein the first extension and the third section receiving the first extension have corresponding shapes, and wherein the recess extends on the first extension and the positioning track extends on the second extension.

9. The extension bar as claimed in claim 8 , wherein the biasing member is circumferentially extended along the outer periphery of the rod and not received in the sleeve, and wherein the biasing member includes a first end abutting an end of the sleeve and a second end abutting an end of the stopper.

10. The extension bar as claimed in claim 9 , wherein the biasing member has a shape including a plurality of coaxial loops.

11. The extension bar as claimed in claim 9 , wherein the first contact section has a first depth from the outer periphery of the rod, and the second contact section has a second depth from the outer periphery of the rod, with the second depth greater than the first depth.

12. The extension bar as claimed in claim 10 , wherein the first contact section has a first depth from the outer periphery of the rod, and the second contact section has a second depth from the outer periphery of the rod, with the second depth greater than the first depth.

13. The extension bar as claimed in claim 11 , wherein the biasing member extends longitudinally at a first length when the sleeve is in the first position thereof and at a second length when the sleeve is in the second position thereof, with the first length greater than the second length.

14. The extension bar as claimed in claim 12 , wherein the biasing member extends longitudinally at a first length when the sleeve is in the first position thereof and at a second length when the sleeve is in the second position thereof, with the first length greater than the second length.

15. The extension bar as claimed in claim 8 , wherein the second extension has a circular cross section.

Assignees

• Hong Ann Tool Ind Co Ltd

Inventors

• Su Cheng-Wei

Classifications

• B25G3/18 Primary

  comprising catches or pawls · CPC title

• Y10T403/592

  Ball detent · CPC title

• B25B23/0007 Primary

  Connections or joints between tool parts · CPC title

• B25B23/0021

  Prolongations interposed between handle and tool · CPC title