Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1990-10-02
1992-04-07
Bertsch, Richard A.
Pumps
Expansible chamber type
Pumping member position controlled port
417492, 417 63, 464161, F04B 706
Patent
active
051023105
ABSTRACT:
The periodic axial movement of the rotary piston (6) is performed by a cam mechanism which has a cam surface (8) rotating around the piston axis and a cam follower (9) that is in functional connection with the cam holder. The relative position of the cam holder determines the piston stroke in the course of one revolution. In this arrangement, the drive shaft (5) can extend coaxially with the piston (6). In a particularly advantageous manner, the follower is pressed against the cam holder under spring pre-tension.
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"Casing Pumps", Oil and Gas Journal, Apr. 13, 1987, pp. 42-47.
Gander Martin
Josler Hans J.
Morscher Elmar
Neher Thomas
Zogg Jean-Marie
Bertsch Richard A.
Dragerwerk Aktiengesellschaft
Freay Charles G.
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