cantilever vs collar beam

cantilever

noun
  • A beam anchored at one end and used as a lever within a microelectromechanical system. 

  • A beam anchored at one end and projecting into space, such as a long bracket projecting from a wall to support a balcony. 

  • A technique, similar to the spread eagle, in which the skater travels along a deep edge with knees bent and bends their back backwards, parallel to the ice. 

verb
  • To project (something) in the manner of or by means of a cantilever. 

collar beam

noun
  • A horizontal piece of timber connecting and tying together two opposite rafters. 

How often have the words cantilever and collar beam occurred in a corpus of books? (source: Google Ngram Viewer )