Tool holder attachment structure
AssigneePascal Engineering Corporation
InventorHiroshi Miyazawa
Life of this patent
Estimating the term…
Abstract
A main shaft includes a plurality of elastic engagement pieces arrayed along an outer perimeter of an attachment hole. During and after assembly, the elastic engagement pieces elastically abut at least an outer surface of a tapered shank in a tool holder and deform slightly in a radial direction. The elastic engagement pieces provide uniform engagement force between the main shaft and the tool holder over a broad surface area. An elastic flange provides additional elastic engagement and easy separation from the main shaft. Together, the elastic engagement pieces and elastic flange reliably engage and securely attach the main shaft to the tool holder while aiding disengagement.
Claims13
A tool holder attachment structure, for removably securing a tool holder with a tool in a tapered attachment hole of main shaft of a machining tool, comprising:
- a shank having a tapered outer perimeter surface;
- said shank provided on said tool holder;
- a plurality of elastic engagement pieces abutting an outer perimeter surface of said tapered outer perimeter surface of said tool holder and being elastically deformable in a radial direction during a fitting;
- and
- a plurality of ring shaped grooves formed at said inner surface section of said attachment hole of said main shaft at a predetermined interval along an axial center of said main shaft, said plurality of ring shaped grooves and said plurality of elastic engagement pieces being arranged in an alternating manner along said axial center;
- said formation of said plurality of ring shaped grooves allowing said plurality of elastic engagement pieces to be integrally formed with said main shaft;
- said plurality of elastic engagement pieces disposed at an inner surface section of said tapered attachment hole of said main shaft;
- and
- said shank in said tapered attachment hole of said main shaft and said tool holder secured to said main shaft during said fitting with said plurality of elastic engagement pieces elastically deformed in said radial direction.
A tool holder attachment structure, for removably securing a tool holder with a tool to a main shaft of a machining tool, comprising:
- at least a shank on said tool holder;
- said shank having at least a tapered outer perimeter surface;
- said main shaft including a tapered attachment hole;
- means for elastically securing said shank in said attachment hole of said main shaft and eliminating vibration and attachment failure during a use of said machining tool and said tool holder attachment;
- at least a plurality of elastic engagement pieces in said means for elastically securing;
- said elastic engagement pieces arrayed concentrically around an inner perimeter section of said attachment hole;
- said elastic engagement pieces extending away from said main shaft and elastically abutting said tapered outer perimeter surface of said shank during an insertion of said shank into said attachment hole;
- said elastic engagement pieces elastically deforming in at least a first radial direction during said insertion and said use, whereby said means for elastically securing enables said elastic engagement pieces to absorb a plurality of use vibrations while maintaining a secure attachment between said main shaft and said tool holder;
- a plurality of ring-shaped grooves on said inner perimeter section of said attachment hole;
- said plurality of ring-shaped grooves arrayed alternatingly with respective said elastic engagement pieces in an axial direction along said inner perimeter section of said attachment hole;
- said plurality of ring-shaped grooves including smooth radius contours at bottom portions thereof, thereby minimizing elastic stress concentration;
- and
- said plurality of elastic engagement pieces extending integrally from said main shaft, thereby simplifying manufacturing and assembly of said main shaft and said tool holder with a uniform force.
Dependencies are inferred from the claim text.