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Model: L02 Positive Return Cam
(Voigt/Reuleaux)
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Model Metadata
Taxonomy:
Voigt
Group:
Positive Return Constant Breadth Cams
ID:
L02
Title (English):
Positive Return Cam
Title (German):
Gleichseitiges Bogendreieck in schiefer Shleife mit Pohlbahn
Creator:
Franz Reuleaux
Date Created:
1882-00-00
Manufacturer:
Gustav Voigt Werkstatt
Size:
Base: Width x Depth [198,89]mm; Overall: W x D x Height [264,117,204]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:
This positive return cam mechanism is a practical application of curves of constant width as shown in models B2,B3,B4. The curved equilateral triangle has been called by several mathematicians, a Reuleaux Triangle, because Reuleaux was the first to present an extensive discussion and analysis of these curves in his 1875 book on Theoretical Kinematics. However this particular cam can be found in an 1820's steam engine in the Science Museum in London. It was used to control the entrance and exit of steam into the cylinder chamber. The "Reuleaux Triangle" cam moves a valve and has a pause or dwell in the motion. It is likely that this device was discovered by several inventors perhaps as early as the time of the first Watt engines in the late 18th century. However ingenious this mechanism, it has all but been forgotten by engineers in the early 21st century. In this mechanism, the parallel guides are at an incline that changes the phase of the dwell period. See discussion in B2.
Descr Author:
Francis Moon
Descr Date:
2003-05-29
Image Metadata
Title:
L02. Positive Return Cam
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:
2005-01-19 11:02:16
URL:
http://kmoddl.library.cornell.edu/stillImages/small/L02.jpg
Size (w x h):
384 x 257

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