US PATENT SUBCLASS 123 / 90.24
.~ Valve driven closed

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.24.~ Valve driven closed {2}
90.25  DF  .~.~> By valve-opening rocker
90.26  DF  .~.~> By cam-actuated unitary follower

DEFINITION

Classification: 123/90.24

(under subclass 90.1) Device wherein means is provided to mechanically drive the valve in its closing (i.e., seating) direction of travel.

(1) Note. While correctly identified as Desmodromic actuation, this aspect of valve operation frequently is termed "positive closing" (as contrasted with "spring return").