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Title: Braking system for use with an arbor of a microscope

Abstract

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 device 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.

Inventors:
 [1]
  1. (Orinda, CA)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865151
Patent Number(s):
US 4470484
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
braking; arbor; microscope; balanced; comprising; plurality; assemblies; located; braked; consists; spring; biased; piston; material; fitted; contraction; cooling; provided; recessed; head; portion; positioned; diaphragm; forming; space; therebetween; connected; pressurized; fluid; supply; controlled; contact; withdraw; device; causes; contract; producing; tight; shrink; fit; particularly; applicable; selectively; electron; immobilizes; example; vertically; adjustable; temperature; specimen; holder; observation; provides; forces; easily; removed; re-established; minimal; disturbance; location; braking force; easily removed; electron microscope; particularly applicable; pressurized fluid; space therebetween; shrink fit; specimen holder; spring biased; cooling device; vertically adjustable; braking assemblies; device causes; /188/

Citation Formats

Norgren, Duane U. Braking system for use with an arbor of a microscope. United States: N. p., 1984. Web.
Norgren, Duane U. Braking system for use with an arbor of a microscope. United States.
Norgren, Duane U. Sun . "Braking system for use with an arbor of a microscope". United States. https://www.osti.gov/servlets/purl/865151.
@article{osti_865151,
title = {Braking system for use with an arbor of a microscope},
author = {Norgren, Duane U.},
abstractNote = {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 device 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

Patent:

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