.~ Biasing means effects eduction stroke of abutment driven, pressure producing pumping member
DEFINITION
Classification: 417/471
(under subclass 437) Apparatus in which the expansible chamber-type pump is disclosed as being utilized for the purpose of producing pressure greater than atmospheric the pumping member of which is driven in a chamber expanding direction by means of an element (e.g., cam) which is unsecured to, and adapted for abutment with the pumping member or portion rigid therewith to drive same, there being provided separate means, other than the pumped fluid, (e.g., spring) associated with the pumping member for continuously urging said pumping member in a chamber collapsing direction.
(1) Note. Expansible chamber-type pumps having the above defined relationship between the pumping member, abutment drive, and biasing means are excluded under this definition if disclosed as being utilized for the purpose of producing a vacuum, such pumps being classified below on other features.
SEE OR SEARCH CLASS
92, Expansible Chamber Devices,
129, for an expansible chamber device having an abutment connection between the working member thereof and a power
