Variable displacement sealed pump

Claim 2

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, and means in which the head is mounted, said last means and head having threads comprising helical grooves positioned opposite each other forming a helical channel and means comprising a helical flexible sealing element positioned in the oppositely facing grooves forming the channel.

Claim 3

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; Means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, said adjustable cylinder head means including a part which is threadably mounted and sealed to the cylinder, whereby upon relative rotation of said threadably mounted part, piston displacement is varied, support means carrying a member which carries said threadably mounted part, said member having external and internal threads, the support means having a bore having internal threads, the threadably mounted part having external threads, all of the threads including grooves, the external grooves on the member and the internal grooves in the bore in the support means facing each other forming a first helical channel and internal grooves in said member and the external grooves on the threadably mounted part facing each other forming a second helical channel and each of said helical channels having therein an elongated flexible sealing element.

Claim 4

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; Means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, said adjustable cylinder head means including a part which is threadably mounted and sealed to the cylinder, whereby upon relative rotation of said threadably mounted part, piston displacement is varied, support means carrying a member which carries said threadably mounted part, said member having external and internal threads, the support means having a bore having internal threads, the threadably mounted part having external threads, all of the threads including grooves, the external grooves on the member and the internal grooves in the bore in the support means facing each other forming a first helical channel and internal grooves in said member and the external grooves on the threadably mounted part facing each other forming a second helical channel and each of said helical channels having therein an elongated flexible sealing element.

Claim 5

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, said adjustable cylinder head means including a part which is threadably mounted and sealed to the cylinder, whereby upon relative rotation of said threadably mounted part, piston displacement is varied, support means carrying a member which carries said threadably mounted part, said member having a threaded bore, the threadably mounted part being threaded therein, said support means having a threaded bore and said member having external threads threaded into said bore whereby upon rotation of said member said threadably mounted part can be adjusted axially without rotation, said threadably mounted part having external threads, said bore having internal threads, each of said threads including grooves positioned in facing relationship to each other whereby to form a helical channel and an elongated sealing member fitting in said channel.

Claim 6

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, said adjustable cylinder head means including a part which is threadably mounted and sealed to the cylinder, whereby upon relative rotation of said threadably mounted part, piston displacement is varied, support means carrying a member which carries said threadably mounted part, said member having a threaded bore, the threadably mounted part being threaded therein, said support means having a threaded bore and said member having external threads threaded into said bore whereby upon rotation of said member said threadably mounted part can be adjusted axially without rotation, said threadably mounted part having external threads, said bore having internal threads, each of said threads including grooves positioned in facing relationship to each other whereby to form a helical channel and an elongated sealing member fitting in said channel.

Claim 7

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, said adjustable cylinder head means including a part which is threadably mounted and sealed to the cylinder, whereby upon relative rotation of said threadably mounted part, piston displacement is varied, support means carrying a member which carries said threadably mounted part, said member having a threaded bore, the threadably mounted part being threaded therein, said support means having a threaded bore and said member having external threads threaded into said bore whereby upon rotation of said member, said threadably mounted part can be adjusted axially without rotation, said member having internal and external threads, said threadably mounted part having external threads, the internal threads in said member and the external grooves on said threadably mounted part cOmprising grooves having facing relationship forming a first elongated helical channel the external threads on said member and the internal threads in said bore comprising grooves having facing relationship to each other forming a second elongated helical channel and elongated flexible sealing members positioned in said first and second helical channels.

Claim 8

A sealed pump comprising: a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder; magnetic core means associated with the piston and cylinder; means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, said adjustable cylinder head means including a part which is threadably mounted and sealed to the cylinder, whereby upon relative rotation of said threadably mounted part, piston displacement is varied, support means carrying a member which carries said threadably mounted part, said member having a threaded bore, the threadably mounted part being threaded therein, said support means having a threaded bore and said member having external threads threaded into said bore whereby upon rotation of said member, said threadably mounted part can be adjusted axially without rotation, said member having internal and external threads, said threadably mounted part having external threads, the internal threads in said member and the external grooves on said threadably mounted part cOmprising grooves having facing relationship forming a first elongated helical channel the external threads on said member and the internal threads in said bore comprising grooves having facing relationship to each other forming a second elongated helical channel and elongated flexible sealing members positioned in said first and second helical channels.