Patent ID: 11904375
Assignee: nan
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 3:
4. A die plate and holding plate securement arrangement for a punch press machine assembly, the securement arrangement comprising:
an elongated fastener device (200) for enabling the securement of a the die plate (12) and a the holding plate (14) of a punch press assembly, the elongated device (200) consisting of three portions of generally equal length, a proximal or first upper portion (A), a middle portion (B) and a lower portion (C);
wherein the first upper portion (A) of the elongated fastener device (200) comprises a smooth conical side surface (208), which is tapered at angle (T) of between 7° to 14° with respect to a longitudinal axis (L) of the elongated device (200), for smoothly compressing a corresponding conically shaped bore (40) in the die plate (12), the smooth conical surface having a lower end ending at a first transition perimeter (210) of a first strain relief channel (214);
wherein the middle portion (B) of the elongated fastener device (200) consists of the first strain relief channel (214), a second transition perimeter (216) of smaller diameter than the first transition perimeter (212), the middle portion (B) extending a length along the longitudinal axis is cylindrically shaped and has a diameter equal to the diameter of the first transition perimeter of the first strain relief channel and the second transition perimeter extends from a juncture defined by an abutting arrangement of the die plate and the holding plate and into a bore of the holding plate (14), the middle portion (B) of the elongated fastener device distally ending at a first transition perimeter (238) of a second strain relief channel (232); and
wherein the lower portion (C) of the elongated fastener device (200) consists of the second strain relief channel (232) defined by the first transition perimeter (238) and the second strain relief channel (232) with a threaded section (220) extending distally to a distalmost end (240) of the elongated fastener device; and
wherein a tool receiving bore (142) extends into the threaded section of the distalmost end (240) of the lower portion (C) of the elongated fastener device (200), and a tool receiving bore (222) extends into the first upper portion (A) of the elongated fastener device (200), to enable adjustable rotational engagement within a set of die and holding plates (12 and 14) being adjustably joined, from either or both sides thereof.