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Model: T04 Parallel Stage of von Schönemann
(Voigt/Reuleaux)
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Model Metadata
Taxonomy:
Voigt
Group:
Parallel Guide Mechanisms
ID:
T04
Title (English):
Parallel Stage of von Schönemann
Title (German):
Unvollkommene Hebelparallelführung, Oberschalige Wage von Schönemann
Creator:
Franz Reuleaux
Date Created:
1882-00-00
Manufacturer:
Gustav Voigt Werkstatt
Size:
Base: Width x Depth [280,95]mm; Overall: W x D x Height [280,95,217]mm
Medium:
cast iron and brass on wood pedestal
Rights:
For educational use only. All rights reserved by the contributor(s) and publisher(s).
Audience:
General public
Keywords:
Description:
The T series in the Voigt catalog constitute so-called parallel guide mechanisms. In contrast with the straight-line mechanisms in the S series, the parallel guides maintain zero rotational variation between links during motion. The models T-3 to T-8 incorporate horizontal stages as in weighing machines. In model T-4 two lever mechanisms (a smaller one above the lower lever) are coupled by three vertical links as well as through a ground link at their fulcrums. This is an example of a compound kinematic chain. Grübler published a criterion to determine the degrees of freedom for a set of n links and v joints and number of degrees of freedom F=3(n-1)-2r (See KMODDL Tutorial on Mobility (Grübler’s) criteria.) In model T-4, there are 8 cylindrical joints and 6 links (counting the grounded link) which gives F=-1. Since F=1 constitutes a perfect mechanism, the arrangement in T-4 is more like a structure. The special vertical and horizontal link allows small motions that keep the two stages parallel. A similar over-constrained mechanism is shown in Model T-6.
Descr Author:
Francis Moon
Descr Date:
2004-07-00
Image Metadata
Title:
T04. Parallel Stage of von Schönemann
Rights:
Jon Reis/www.jonreis.com. Jon Reis Photography grants Cornell University Libraries, and the Cornell College of Engineering the rights to display copyrighted images of the Reuleaux Collection of Kinematic Mechanisms on the Cornell University and National Science Digital Library web sites and for unlimited use in Cornell University Library publications for education purposes only. Rights for all other uses such as editorial, advertising, web use and display by third parties not affiliated with Cornell University are reserved by the photographer.
Descr:
Date Created:
2006-12-07 23:09:23
URL:
http://kmoddl.library.cornell.edu/stillImages/small/T04.jpg
Size (w x h):
384 x 255

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