Hydraulic chucking head

US4019378A · kind A · utility

Assignee

• Carl Schenck AG · DE

Inventors

• Guenter Keller · Bensberg, DE
• Friedrich Klinger · Weiterstadt, DE
• Andreas Pohl · Groß-Umstadt, DE
• Gerhard Schimanski
• Guenter Zuber · Darmstadt, DE

Key dates

• Filing date: Jun 7, 1976
• Grant date: Apr 26, 1977
• Expiry date: Jun 7, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T279/1283
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This hydraulic chucking head, especially for testing machines wherein the test sample must be held without play in the direction of load application, includes at least two test sample holding pistons movable along a common axis toward each other and toward a central axis through the chucking head. These pistons are hollow inside and movable in respective cylinders in the housing with a certain initial play. The piston walls or jackets are elastically yielding when the pressure inside the piston is increased, whereby the test sample is held and simultaneously said play is removed since the piston walls are pressed against the respective cylinder bores. Preferably a non-metallic coating is provided between the piston walls and the cylinder bores which coating acts as a sealing and reduces friction.