Grinding fixture

US3935679A · kind A · utility

Assignee

• Grede Foundries, Inc. · US

Inventors

• Bruno Peter · Einbeck, DE
• Reinhardt R. Deetken · Holly, US

Key dates

• Filing date: Jul 22, 1974
• Grant date: Feb 3, 1976
• Expiry date: Jul 22, 1994

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B1/2421
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A grinding fixture for grinding cylinder head castings. The fixture includes a row of aligning pins that extend upwardly from the fixture and the lower ends of each pair of adjacent pins are engaged with the ends of a balancing plate which is fulcrumed within the fixture. The outer projecting ends of the pins are received within the combustion chambers in the cylinder head casting, and the aligning pins and balancing plates tend to level the casting in a longitudinal direction. The lower surface of the casting is adapted to engage three targeting pins, and the lower ends of the targeting pins are engaged with a pivotable balancing plate to thereby level the casting in a transverse direction. Spring loaded locking pins extend upwardly from the fixture and engage the bottom surface of the casting. When the casting is leveled through use of the aligning pins and targeting pins, the locking pins are locked to hold the casting rigidly in place for the grinding operation.