Browse Prior Art Database

Rotating Vacuum Holding Fixture

IP.com Disclosure Number: IPCOM000074085D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Milligan, WE: AUTHOR

Abstract

A glass tachometer disc is securely held during inspection without damaging the disc.

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Rotating Vacuum Holding Fixture

A glass tachometer disc is securely held during inspection without damaging the disc.

The disc is placed on a platform having a number of apertures open to a central chamber. The central chamber is connected to a vacuum source by a vacuum inlet fitting. During inspection of the disc on the platform, the platform is rotated by a shaft passing through a hole in a base plate. A seal is provided between the shaft and the base plate, but is not required between the periphery of the rotating platform and the mating portion of the chamber casing if the periphery and casing are closely spaced (approximately 0.005 inch).

When the disc is placed on the platform and a vacuum is applied to the vacuum inlet fitting, the pressure in the chamber is reduced. The reduced pressure is applied to the backside of the disc through the platform holes causing a pressure differential across the disc to hold it securely in place on the platform. The platform may then be rotated with the disc in place. The disc is removed by stopping the rotation and disconnecting the vacuum source.

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