Guide pin assembly for die plate

Claim 2

A guide pin assembly for a removable die plate comprising in combination: an elongated guide pin having a shank adapted for reception into and extension through an opening in a die plate, and having a head on one end thereof for bearing against a side of said plate; plural fastening members each attachable to said plate and distributed around said opening, said fastening members each having a head projecting beyond said side and overlapping and contacting a differing portion of said guide pin head to positively fix said guide pin head in an installed position against said side of said plate.

Claim 3

The assembly defined in claim 1, wherein said head of said guide pin has a frustoconical portion; wherein said heads of said fastening members have frustoconical portions which taper in an axial direction substantially opposite to the direction of taper of the frustoconical portion of said head of said guide pin, said frustoconical portions of said fastening members bearing on said frustoconical portions of said guide pin in substantially continuous line contact for holding said guide pin in place on said plate.

Claim 4

A guide pin assembly for a removable die plate comprising in combination: an elongated guide pin having a shank adapted for reception into and extension through an opening in a die plate, and having a head on one end thereof for bearing against a side of said plate, said head having surfaces converging away from said side; fastening means attachable to said plate and projecting beyond said side, said means having a portion overlapped and engaged with at least one part of said surfaces to positively obstruct movement of said guide pin away from said side of said plate, said fastening means comprising a plurality of screws having tapered heads engageable with the head of each guide pin, said screws being uniformly disposed around and spaced from said guide pin, the converged surfaces of said head of said guide pin being conical, the axes of said heads of said screws and said guide pin being parallel and the angle of taper of said heads of said scrwes being identical to the angle of taper of said head of said guide pin, the tapered surfaces of said screws being firmly engageable with the conical portion of the head of said guide pin for holding said guide pin head firmly against said plate.

Claim 5

A guide pin assembly for a removable die plate comprising in combination: an elongated guide pin having a shank adapted for reception into and extension through an opening in a die plate, and having a head on one end thereof for bearing against a side of said plate, said head having surfaces converging away from said side; fastening means attachable to said plate and projecting beyond said side, said means having a portion overlapped and engaged with at least one part of said surfaces to positively obstruct movement of said guide pin away from said side of said plate, said fastening means comprising a plurality of screws having tapered heads engageable with the head of each guide pin, said screws being uniformly disposed around and spaced from said guide pin, the converged surfaces of said head of said guide pin being conical, the axes of said heads of said screws and said guide pin being parallel and the angle of taper of said heads of said scrwes being identical to the angle of taper of said head of said guide pin, the tapered surfaces of said screws being firmly engageable with the conical portion of the head of said guide pin for holding said guide pin head firmly against said plate.

Claim 6

The assembly defined in claim 3 in which said guide pin has a shank which extends at its free end beyond said plate, the free end of said guide pin shank being receivable into a corresponding opening of a plate support member to locate said plate accurately relative to said plate support member, said shank having a portion of reduced diameter adjacent said head to permit unobstructed engagement of said head with said side of said plate.

Claim 7

The assembly defined in claim 3 in which said head of said guide pin has a cylindrical portion located immediately adjacent said shank which is of relatively short axial extent, whereby said head of said guide pin can be firmly engaged by said heads of said screws before said screw heads can engage said plate.

Claim 8

The assembly defined in claim 3 in which only two said screws are provided for each guide pin, said screws being disposed on diametrically opposite sides of said guide pin and the heads of said screws overlying diametrically opposite portions of said guide pin head.

Claim 9

In a die assembly, the combination comprising: a die plate adapted for carrying a die element; a subdie plate adapted for removably carrying said die plate; means defining first and second transverse holes in said die plate and said subdie plate, respectively, said die plate and subdie plate being accurately positioned relative to each other only when said holes are coaxial; a guide pin having a shank snugly but slidably receivable through said first opening and into said second opening when they are coaxial, said guide pin having a head which bears against that side of said die plate remote from said subdie plate, saId head extending beyond said side of said die plate, said head having a portion converging away from said die plate; and unitary fastening means attachable to said die plate, said fastening means including tapered head means overlying and engaging said converging portion of said head of said guide pin for holding said guide pin in fixed relation with said die plate.

Claim 10

In a die assembly, the combination comprising: a die plate adapted for carrying a die element; a subdie plate adapted for removably carrying said die plate; means defining first and second transverse holes in said die plate and said subdie plate, respectively, said die plate and subdie plate being accurately positioned relative to each other only when said holes are coaxial; a guide pin having a shank snugly but slidably receivable through said first opening and into said second opening when they are coaxial, said guide pin having a head which bears against that side of said die plate remote from said subdie plate, saId head extending beyond said side of said die plate, said head having a portion converging away from said die plate; and unitary fastening means attachable to said die plate, said fastening means including tapered head means overlying and engaging said converging portion of said head of said guide pin for holding said guide pin in fixed relation with said die plate.

Claim 11

The die assembly defined in claim 7 in which said fastening means comprises a plurality of machine screws, said tapered heads thereof being frustoconical and having substantially the same angle of taper as the convergence of said head of said guide pin and said screws having threaded shank portions which threadedly engage said die plate, the frustoconical portions of said screws engaging the converging portion of said guide pin head for urging said guide pin head firmly against said remote surface of said die plate and thereby holding said guide pin rigidly with respect to said die plate.

Claim 12

The die assembly defined in claim 8 in which said die plate is of relatively thin, soft metal.

Claim 13

The die assembly defined in claim 8 in which said die plate is of wood.