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Title: Braking system

A balanced braking system comprising a plurality of braking assemblies located about a member to be braked. Each of the braking assemblies consists of a spring biased piston of a first material fitted into a body of a different material which has a greater contraction upon cooling than the piston material. The piston is provided with a recessed head portion over which is positioned a diaphragm and forming a space therebetween to which is connected a pressurized fluid supply. The diaphragm is controlled by the fluid in the space to contact or withdraw from the member to be braked. A cooling means causes the body within which the piston is fitted to contract more than the piston, producing a tight shrink fit therebetween. The braking system is particularly applicable for selectively braking an arbor of an electron microscope which immobilizes, for example, a vertically adjustable low temperature specimen holder during observation. The system provides balanced braking forces which can be easily removed and re-established with minimal disturbance to arbor location.
Authors:
Publication Date:
OSTI Identifier:
5614133
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; BRAKES; DESIGN; ELECTRON MICROSCOPES; CONTRACTION; HYDRAULIC EQUIPMENT; PISTONS; THERMAL EXPANSION; EQUIPMENT; EXPANSION; MACHINE PARTS; MICROSCOPES 420200* -- Engineering-- Facilities, Equipment, & Techniques