Bit accessory and bit assembly

Patent metadata

Field	Value
Publication number	US-2016016298-A1
Application number	US-201514640162-A
Country	US
Kind code	A1
Filing date	Mar 6, 2015
Priority date	Jul 15, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

A bit accessory for a bit has a sleeve with an accommodating cavity running through the sleeve and a limiting member with a limiting hole running through the limiting member. The sleeve includes a first stopping portion for stopping the limiting member from passing through the accommodating cavity and the limiting member includes a first hole wall portion forming a first hole wall which provides the limiting hole with a minimum hole diameter and a second hole wall portion forming a second hole wall which provides the limiting hole with a maximum hole diameter. The limiting member is at least partly accommodated in the accommodating cavity, and a direction which the limiting hole runs through the limiting member is parallel to the accommodating cavity when the limiting member is stopped by the first stopping portion.

First claim

What is claimed is:

1 . A bit accessory for a bit, comprising:
a sleeve with an accommodating cavity running through the sleeve; and a limiting member with a limiting hole running through the limiting member; wherein the sleeve comprises a first stopping portion for stopping the limiting member from passing through the accommodating cavity; wherein the limiting member comprises a first hole wall portion forming a first hole wall of the limiting hole and providing the limiting hole with a minimum hole diameter and a second hole wall portion forming a second hole wall of the limiting hole and providing the limiting hole with a maximum hole diameter; and wherein the limiting member is at least partly accommodated in the accommodating cavity and a direction which the limiting hole runs through the limiting member is parallel to the accommodating cavity when the limiting member is stopped by the first stopping portion.

2 . The bit accessory according to claim 1 , further comprising a functioning member installed on a front end of the sleeve wherein the first stopping portion stops the limiting member so that the limiting member is incapable of moving out of the accommodating cavity from the front end of the sleeve on which the functioning member is installed.

3 . The bit accessory according to claim 2 , wherein the functioning member has a magnetic portion.

4 . The bit accessory according to claim 1 , further comprising an installing casing for elastically sleeving over an outer periphery of the bit wherein the installing casing is at least partly accommodated in the accommodating cavity.

5 . The bit accessory according to claim 4 , wherein the installing casing is made of rubber material.

6 . The bit accessory according to claim 4 , further comprising an end cap having an inserting hole with a hole diameter smaller than an outer diameter of the installing casing wherein the end cap is installed on a rear end of the sleeve, and the first stopping portion is formed on the front end of the sleeve and stops the installing casing from completely moving out of the sleeve from the front end.

7 . The bit accessory according to claim 6 , wherein the end cap comprises a limiting wall surface extending along a direction parallel to the accommodating cavity and the limiting wall surface provides a minimum hole diameter of the inserting hole.

8 . The bit accessory according to claim 1 , wherein the first hole wall portion and the second hole wall portion are arranged alternatively in the circumferential direction of the limiting hole.

9 . The bit accessory according to claim 1 , wherein the first hole wall portion protrudes from the second hole wall portion.

10 . The bit accessory according to claim 9 , wherein the first hole wall portion comprises an inner arc edge and straight edges located on the two sides of the inner arc edge, and the two ends of the inner arc edge are connected to one end of each straight edge and the other end of each straight edge is connected to the second hole wall portion.

11 . The bit accessory according to claim 10 , wherein the second hole wall portion comprises an outer arc edge having a radius larger than the radius of the arc of the inner arc edge and the two ends of the outer arc edge are connected to different straight edges.

12 . A bit assembly, comprising:
a bit with a head; and a bit accessory; wherein the bit accessory comprises: a sleeve with an accommodating cavity running through the sleeve; and a limiting member with a limiting hole running through the limiting member; wherein the sleeve comprises: a first stopping portion for stopping the limiting member from passing through the accommodating cavity; wherein the the limiting member comprises: a first hole wall portion forming a first hole wall of the limiting hole and providing the limiting hole with a minimum hole diameter and a second hole wall portion forming a second hole wall of the limiting hole and providing the limiting hole with a maximum hole diameter; and wherein the limiting member is at least partly accommodated in the accommodating cavity and a direction which the limiting hole runs through the limiting member is parallel to the accommodating cavity when the limiting member is stopped by the first stopping portion.

13 . A bit accessory for a bit, comprising:
a sleeve having an accommodating cavity for a bit to pass through; and an installing casing accommodated in the accommodating cavity; wherein the installing casing is arranged to move along an extending direction of the accommodating cavity in a determined range and is adapted to elastically cover an outer periphery of the bit passing through the installing casing.

14 . The bit accessory according to claim 13 , wherein the sleeve comprises a first stopping portion for stopping the installing casing from further moving towards a front end of the sleeve.

15 . The bit accessory according to claim 14 , wherein the sleeve further comprises a second stopping portion for stopping the installing casing from further moving towards a rear end of the sleeve.

16 . The bit accessory according to claim 15 , wherein the sleeve comprises a limiting portion formed in the accommodating cavity, the bit accessory further comprises a functioning member arranged on the front end of the sleeve, and the limiting portion is arranged between the functioning member and the installing casing.

17 . The bit accessory according to claim 16 , wherein the sleeve comprises a sleeve body and an end cap, the accommodating cavity is formed in the sleeve body, the end cap comprises a cover portion for partly covering the rear end of the accommodating cavity, the cover portion has an inserting hole, the end cap is arranged on a rear end of the sleeve body, the first stopping portion comprises a first annular surface formed by the sleeve body in the accommodating cavity, and the second stopping portion comprises a second annular surface formed by an inner side of the cover portion.

18 . The bit accessory according to claim 17 , wherein the end cap is fixed on the rear end of the sleeve body by a threaded connection, the sleeve body forms an outer threaded portion, and the end cap forms an inner threaded portion.

19 . The bit accessory according to claim 13 , wherein the installing casing is made of rubber material.

20 . The bit accessory according to claim 13 , wherein the functioning member is a ring having magnetism and the front end of the sleeve is provided with an opened installing groove in which the functioning member is fixed.

Assignees

• Chervon Ip Ltd

Inventors

• Zhang Xiaofeng
• Li Rongzhen

Classifications

• B25B23/12 Primary

  using magnetic means · CPC title

• B25B23/02

  Arrangements for handling screws or nuts · CPC title

• B25B15/001 Primary

  characterised by material or shape of the tool bit · CPC title

• B25B23/0042

  Connection means between screwdriver handle and screwdriver shaft · CPC title

• B25B21/007 Primary

  Attachments for drilling apparatus for screw or nut setting or loosening · CPC title