CPC F01C 1/3442 (2013.01) [F01C 20/18 (2013.01); F01C 21/0845 (2013.01); F04C 2/344 (2013.01); F04C 29/04 (2013.01); F04C 2210/105 (2013.01); F04C 2210/222 (2013.01); F04C 2210/227 (2013.01)] | 19 Claims |
1. A rotary positive displacement device comprising:
a rotatable offset housing defining an operating fluid chamber;
a casing about the housing for altering a volume of the chamber;
at least one vane seal between the housing and an inner surface of the casing for further defining the chamber;
a position shiftable head of uniform maximum outer diameter for further defining the chamber to responsively regulate chamber volume in response to the altering thereof; and
a tab of the housing for slidably interfacing with a parallel surface of a slot of the position shiftable head to establish a set predetermined maximum range of motion for the head between fully extended and fully retracted position limits, the fully retracted position limit determined exclusively by the interfacing of the tab and slot.
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