Carburetor air intake acceleration control

Claim 1

A pneumatic control comprising: a sheet-form, cylindrical housing having an open end forming a controlled airflow port and means forming a second port in said housing communicating with said controlled port; an axially extending support shaft fixedly secured to said housing; sheet-form means forming a circular valve member overlying said housing open end and having peripheral edge portions cooperable with said housing to control airflow through said controlled airflow port, said sheet-form means having a centrally disposed clearance aperture formed therein and slidingly received on said support shaft for guiding movement of said valve member axially of said shaft between an open position for admitting air through said housing and a close position for preventing air flow through said housing; means sealingly secured to said valve member and forming an air chamber; passageway means forming an air passage into said air chamber; a flexible diaphragm extending across said air chamber and having peripheral edge portions attached to said valve member and a central portion attached to said post in a manner to form a movable wall for said air chamber; and resilient biasing means urging said valve member toward one of its positions on said sUpport shaft, whereby the pneumatic forces within said air chamber opposing the bias of said resilient means is varied to control movement of said valve member for controlling the flow of air through said control airflow port.