Screw driver

The screwdriver design addresses the issue of locking in air motor separated type screwdrivers by using guide surfaces on the driver bit to ensure line contact between the rollers and the flat surfaces, enhancing torque transmission efficiency.

JP7689898B2Active Publication Date: 2025-06-09MAKITA CORP
View PDF 4 Cites 0 Cited by

Patent Information

Application Number
JP2021166676
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-10-11
Publication Date
2025-06-09
Estimated Expiration
2041-10-11

Smart Images

  • Figure 0007689898000001
    Figure 0007689898000001
  • Figure 0007689898000002
    Figure 0007689898000002
  • Figure 0007689898000003
    Figure 0007689898000003
Patent Text Reader

Abstract

To improve bit exchanging convenience by smoothly guiding a hexagonal bar driver bit to a roller slide-contact state through movement in a screw axial direction when a bit driving machine which strikes a screw in the screw axial direction and rotates it in the screw axial direction to fasten it is configured such that each roller of a bit rotation part is slid into line-contact with the flat outer surface of the driver bit and is rotated in the screw axial direction.SOLUTION: A plurality of guide surfaces C is provided at the tip of a driver 31. The guide surfaces C are provided ununiformly around a center axis J so that a circumscribed circle of the tip surface of the driver 31 can be smaller in diameter than inscribed circles of three rollers 23. The rollers 23 abut against the uneven guide surfaces C to generate moment M about the center axis J in the driver 31, and the rollers 23 are guided to a state where they are slid into line-contact with the flat outer surface F of the driver 31.SELECTED DRAWING: Figure 2
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Fitting tool for driving screw

    JP1986257784A

  • Driver bit propelling mechanism for screw driver

    JP2000061854A

  • Attaching / detaching device of driver bit of compressed air screwing machine

    JP2003236766A

  • Rotation power transmission mechanism in screw driving machine

    JP2007136584A