Title:
Rotational Displacement Apparatus With Ultra-low Torque And High Thrust Load Capability

dc.contributor.patentcreator Hooke, David Andrew
dc.contributor.patentcreator Armanios, Erian A.
dc.date.accessioned 2017-05-12T14:27:18Z
dc.date.available 2017-05-12T14:27:18Z
dc.date.filed 11/24/1995
dc.date.issued 8/26/1997
dc.description.abstract This invention comprises an improved rotational displacement apparatus for measuring accurately the twist induced in an extension-twist coupled specimen in response to application of an axial load. The apparatus has an internal cylinder within which a piston rides. A piston rod extends from the piston through a pair of radial ball bearings in the base of the cylinder block to a free end outside the cylinder block. The piston is sized to be slightly smaller in diameter than the cylinder to provide a small space between the piston and the cylinder walls. Means for supplying compressed air to the region of the cylinder below the piston and means for venting air from the region of the cylinder above the piston are provided. An optical encoder is coupled to measure rotational motion of the piston within the cylinder. In use, the apparatus is mounted in a testing machine and a specimen to be tested is secured at one end to the free end of the piston rod and at its other end to the mounting block of the testing machine. Compressed air is then supplied to the cylinder causing the piston to ride up in the cylinder to apply an axial load to the test specimen. The piston rides on a cushion of compressed air and is free to rotate virtually friction free. Thus, any twist induced in the specimen as a result of the axial load causes the piston to rotate and this rotation is measured by the optical encoder.
dc.description.assignee Georgia Tech Research Corporation
dc.identifier.cpc G01N3/22
dc.identifier.cpc G01L5/0038
dc.identifier.patentapplicationnumber 08/562586
dc.identifier.patentnumber 5661247
dc.identifier.uri http://hdl.handle.net/1853/57242
dc.identifier.uspc 73/847
dc.title Rotational Displacement Apparatus With Ultra-low Torque And High Thrust Load Capability
dc.type Text
dc.type.genre Patent
dspace.entity.type Publication
local.contributor.corporatename Georgia Institute of Technology
local.relation.ispartofseries Georgia Tech Patents
relation.isOrgUnitOfPublication cc30e153-7a64-4ae2-9b1d-5436686785e3
relation.isSeriesOfPublication 0f49c79d-4efb-4bd9-b060-5c7f9191b9da
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