SCREW TIGHTENING APPARATUS

• US 20080314197A1
• Filed: 09/02/2008
• Published: 12/25/2008
• Est. Priority Date: 03/01/2006
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Honma, Tsutomu
• Application Number:
  US12/202,695
• Publication Number:
  US 20080314197A1
• Time in Patent Office: Days
• US Class Current: 74/815
• CPC Class Codes: B23P 19/066 by electrical means
• CPC Class Codes: B25B 21/00 Portable power-driven screw or nut setting or loosening tools; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; for mounting or dismounting wheels B60B29/006; Attachments for drilling apparatus serving the same purpose machines B23P19/06
• CPC Class Codes: B25B 23/08 for holding or positioning screw or nut prior to or during its rotation
• CPC Class Codes: B25B 23/14 Arrangement of torque limiters or torque indicators in wrenches or screwdrivers couplings for transmitting rotation or clutches F16D; devices for measuring torque per se G01L
• CPC Class Codes: B25B 23/147 specially adapted for electrically operated wrenches or screwdrivers
• CPC Class Codes: G01L 5/24 for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
• CPC Class Codes: Y10T 74/1412 with locating point adjusting

Abstract

A screw tightening apparatus includes a sleeve that surrounds a leading end of the bit; and a first adjustment member and a second adjustment member that adjust a position of a tip end of the sleeve with respect to the leading end of the bit in an axial direction of the sleeve and the bit. When the first and second adjustment members are operated by a same amount, an adjusted amount of the position of the tip end of the sleeve by the second adjustment member is smaller than an adjusted amount of the position of the tip end of the sleeve by the first adjustment member. The screw tightening apparatus is capable of easily and highly precisely adjusting (setting) a protruding amount of the leading end of the bit from the tip end of the sleeve.

Claims

1. A screw tightening apparatus which rotates a bit for screw tightening, comprising:

a sleeve that surrounds a leading end of the bit; and

a first adjustment member and a second adjustment member that adjust a position of a tip end of the sleeve with respect to the leading end of the bit in an axial direction of the sleeve and the bit,

wherein, when the first and second adjustment members are operated by a same amount, an adjusted amount of the position of the tip end of the sleeve by the second adjustment member is smaller than an adjusted amount of the position of the tip end of the sleeve by the first adjustment member.

2. A screw tightening apparatus according to claim 1,

wherein a first screw part formed in the first adjustment member is engaged with a main body screw part formed in a main body of the screw tightening apparatus,

wherein a second screw part formed in the first adjustment member is engaged with a third screw part formed in the second adjustment member movable in the axial direction integrally with the sleeve, and

wherein a pitch between the second and third screw parts is smaller than that between the first and main body screw parts.

3. A screw tightening apparatus according to claim 2, further comprising:

a first lock member which is engaged with the main body screw part and is capable of blocking a movement of the first adjustment member; and

a second lock member which is engaged with the third screw part and is capable of blocking a movement of the second adjustment member.

4. A screw tightening apparatus according to claim 1, the screw tightening apparatus absorbs a screw by a negative pressure in a state in which the bit is engaged with a recess of the screw and the tip end of the sleeve is in contact with the screw.

5. A screw tightening apparatus according to claim 2, the screw tightening apparatus absorbs a screw by a negative pressure in a state in which the bit is engaged with a recess of the screw and the tip end of the sleeve is in contact with the screw.

6. A screw tightening apparatus according to claim 3, the screw tightening apparatus absorbs a screw by a negative pressure in a state in which the bit is engaged with a recess of the screw and the tip end of the sleeve is in contact with the screw.