Stock ejector assembly
AssigneeStandard Lifters, Inc.
InventorsScott M. Breen, Joel T. Pyper
Life of this patent
Estimating the term…
Abstract
A stock ejector assembly and method for metal forming dies includes a stock ejector with a large spring and a ring-style stripper. The ring-style stripper provides a larger surface area for contacting the stock. The large compression spring is preloaded and when a load is applied, the stripper retracts and the spring pressure increases. When the dies separate, the stock ejector pushes the part off flat surfaces, separating surfaces sealed by adhesion, including but not limited to oil or lubricant adhesion.
Claims20
In a multi-station progressive metal forming die having at least two mutually converging and diverging die members between which an elongate stock strip is shifted longitudinally to form parts from the stock strip, the improvement of a stock ejector assembly, comprising:
- a stripper with an outer collar portion with an outer end surface oriented toward the stock strip and a generally cylindrical first sidewall with a first outer diameter, an inner collar portion with an inner end surface oriented away from the stock strip and a generally cylindrical second sidewall with a second outer diameter which is less than said first outer diameter of said first sidewall of said outer collar portion and defines an annularly shaped, radially oriented shoulder therebetween;
- wherein:
- said outer collar portion has a first inner diameter;
- said inner collar portion has a second inner diameter which is less than said first inner diameter of said outer collar portion and defines an annularly shaped, radially oriented inner shoulder therebetween;
- said first outer diameter and said first inner diameter of said outer collar portion of said stripper form a ring-shaped surface for contacting the stock strip;
- a flange nut having a generally cylindrical outer end portion that is oriented toward the stock strip, an inner end portion that is oriented away from the stock strip, and a fastener aperture extending from the outer end portion through the inner end portion;
- a spring member having a generally hollow interior that is received over said outer end portion of the flange nut and the inner collar portion of the stripper, an outer end oriented toward the stock strip that engages the radially oriented shoulder of the stripper, and an opposite inner end oriented away from the stock strip that engages a surface of the inner end portion of the flange nut;
- and
- a fastener that secures the assembly to one of the die members.
A stock ejector assembly for metal forming dies having at least two mutually converging and diverging die members between which parts are formed from a stock strip, comprising:
- a stripper with an outer collar portion with an outer end surface oriented toward the stock strip and a generally cylindrical first sidewall with a first outer diameter, an inner collar portion with an inner end surface oriented away from the stock strip and a generally cylindrical second sidewall with a second outer diameter which is less than said first outer diameter of said first sidewall of said outer collar portion and defines an annularly shaped, radially oriented shoulder therebetween;
- wherein:
- said outer collar portion has a first inner diameter;
- said inner collar portion has a second inner diameter which is less than said first inner diameter of said outer collar portion and defines an annularly shaped, radially oriented inner shoulder therebetween;
- said first outer diameter and said first inner diameter of said outer collar portion of said stripper form a ring-shaped surface for contacting the stock strip;
- a flange nut having a generally cylindrical outer end portion that is oriented toward the stock strip, an inner end portion that is oriented away from the stock strip, and a fastener aperture extending from the outer end portion through the inner end portion;
- a spring member having a generally hollow interior that is received over said outer end portion of the flange nut and the inner collar portion of the stripper, an outer end oriented toward the stock strip that engages the radially oriented shoulder of the stripper, and an opposite inner end oriented away from the stock strip that engages a surface of the inner end portion of the flange nut;
- and
- a fastener.
In a method for making a multi-station progressive metal forming die having at least two mutually converging and diverging die members between which an elongate stock strip is shifted longitudinally to form parts from the stock strip, with the improvement of at least one stock ejector assembly, comprising:
- forming a stripper with an outer collar portion with an outer end surface oriented toward the stock strip and a generally cylindrical first sidewall with a first outer diameter, an inner collar portion with an inner end surface oriented away from the stock strip and a generally cylindrical second sidewall with a second outer diameter which is less than said first outer diameter of said first sidewall of said outer collar portion to define an annularly shaped, radially oriented shoulder therebetween, including:
- forming said outer collar portion with a first inner diameter;
- forming said inner collar portion with a second inner diameter which is less than said first inner diameter of said outer collar portion to define an annularly shaped, radially oriented inner shoulder therebetween, and an aperture that is formed by said second inner diameter of the inner collar portion;
- selecting a flange nut with a generally cylindrical outer end portion that is oriented toward the stock strip, an inner end portion that is oriented away from the stock strip, and a fastener aperture extending from the outer end portion through the inner end portion;
- selecting a spring member with a generally hollow interior, an outer end oriented toward the stock strip, and an opposite inner end oriented away from the stock strip;
- inserting said spring member over said outer end portion of the flange nut and the inner collar portion of the stripper with the outer end of the spring member engaging the radially oriented outer shoulder of the stripper and the inner end of the spring member engaging a surface of the inner end portion of the flange nut;
- selecting a fastener with a head having an outer end portion oriented towards the stock strip and an inner end portion oriented away from the stock strip and a threaded shank portion that extends from said inner end portion of the head of the fastener;
- inserting the fastener through the fastener aperture in the flange nut;
- and
- securing the stock ejector assembly to one die member by securing the fastener into a threaded aperture formed in said one die member.
Dependencies are inferred from the claim text.