US4795317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetostrictive pump with reversible valves
Assignee: Valenite LLC
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Filing: 1986-09-08
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Granted: 1989-01-03
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Expires: 2006-09-08
Abstract
Abstract A hydraulic pump having a cylinder closed at one end with an elongated piston arranged within the cylinder from the other end. The piston is constructed of a positive magnetostrictive material which increases in length in the presence of a magnetic field of appropriate intensity. It is wound along its length with a coil of wire capable of producing an electro-magnetic field upon energization. The piston is fastened at the open end of the cylinder to define a cylinder cavity between the cylinder closed end and the piston. A pair of passages including valves, for use as an intake and an exhaust passage, settable as required, communicate with this cavity. The valve members in each cavity comprises a magnetically polarized member, each of opposed polarity as related to the other, such that upon energization of the pump with one polarity of pulses, the valves will assume a particular function, and with a reversed polarity of operating pulses, a reverse function. The volume of this cavity is reduced when the piston expands under the influence of the magnetic field created by the coil to produce a pressure on any fluid contained within said cavity to force it out the exhaust passage. In a preferred embodiment the cylinder is constructed of a negative magnetostrictive material which contracts or shrinks in length in the presence of magnetic field. Thus, in the preferred embodiment, upon energization of the coil, the cylinder's shrinkage and the piston's expansion double the relative movement of the piston force to increase the volume displacement of the pump.
Inventors
- 👤 Robert F. Cusack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:02
CPC Classifications
F; F04; F04B; F04B7/00; F04B7/0076; F04B17/00; F04B17/03; F04B17/04; F04B17/042
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
177 words
A fluid pump assembly for step control machine tool applications comprising: a cylinder having a first and a second end, an elongate piston of a length shorter than said cylinder and having a first and second end, said piston formed of a positive magneto-strictive material, said first end of said piston secured to said first end of said cylinder, a cylinder head secured to said cylinder second end and having inlet and outlet passages to the exterior, each said passage including an elongate chamber having a magnetic valve seat, a valve member located in each said chamber, said valve members including permanent magnet means, said magnet means positioned in said chamber such that the comparable ends of said valves and said seats have opposite magnetic poles, means to interruptedly apply a magnetic field to said assembly of a first polarity, said means comprises a magnetic coil wound around the exterior of said cylinder, said piston operated responsive to said magnetic field to expand and expel any fluid located between said piston and head via an outlet passage.
Claim 2
Dependent Claim
177 words
A fluid pump assembly for step control machine tool applications comprising: a cylinder having a first and a second end, an elongate piston of a length shorter than said cylinder and having a first and second end, said piston formed of a positive magneto-strictive material, said first end of said piston secured to said first end of said cylinder, a cylinder head secured to said cylinder second end and having inlet and outlet passages to the exterior, each said passage including an elongate chamber having a magnetic valve seat, a valve member located in each said chamber, said valve members including permanent magnet means, said magnet means positioned in said chamber such that the comparable ends of said valves and said seats have opposite magnetic poles, means to interruptedly apply a magnetic field to said assembly of a first polarity, said means comprises a magnetic coil wound around the exterior of said cylinder, said piston operated responsive to said magnetic field to expand and expel any fluid located between said piston and head via an outlet passage.
Claim 3
Dependent Claim
19 words
A fluid pump assembly as claimed in claim 1 wherein said cylinder is formed of a negative magnetostrictive material.
Claim 4
Dependent Claim
36 words
A fluid pump assembly as claimed in claim 2 wherein said piston contracts and said cylinder expands to their original lengths upon collapse of said magnetic field to draw in any fluid at said inlet passage.
Claim 5
Dependent Claim
38 words
A fluid pump assembly as claimed in claim 1 wherein said piston includes a circumferentially depressed section between its ends and said means to interruptedly apply a magnetic field comprises a magnetic coil located in said depressed section.
Claim 6
Dependent Claim
18 words
A fluid pump assembly as claimed in claim 1 wherein said cylinder is formed of a non-magnetic material.
Claim 7
Dependent Claim
16 words
A fluid pump assembly as claimed in claim 1 wherein said cylinder is formed of nickel.
Claim 8
Dependent Claim
26 words
A fluid pump assembly as claimed in claim 1 wherein said piston is formed of an alloy consisting of 49% cobalt, 49% iron and 2% vanadium.
Claim 9
Dependent Claim
16 words
A fluid pump assembly as claimed in claim 7 wherein said cylinder is formed of nickel.
Claim 10
Dependent Claim
32 words
A fluid pump assembly as claimed in claim 1 wherein said means to interruptedly apply a magnetic field to said assembly is operated to apply a magnetic field of a second polarity.
Claim 11
Dependent Claim
47 words
A fluid pump assembly as claimed in claim 1 wherein said means to interruptedly apply a magnetic field to said assembly is operated to apply a magnetic field of a second polarity, said valve member operated in response to said second polarity to reverse their resepctive positions.
Claim 12
Dependent Claim
191 words
A fluid pump for step control machine tool applications assembly comprising: a cylinder having a first and second end, said cylinder formed of a positive magneto-strictive material, an elongate piston of a length shorter than said cylinder and having a first and a second end, said piston formed of a negative magneto-strictive material, said first end of said piston secured to said first end of said cylinder, a cylinder head secured to said cylinder second end and having inlet and outlet passages to the exterior, each said passage including an elongate chamber having a magnetic valve seat, a valve member located in each said chamber, said valve members including permanent magnet means, said magnet means positioned in said valve members such that the comparable ends of said valves have opposite magnetic poles, means to interruptedly apply a magnetic field to said assembly of a first polarity, said means comprises a magnetic coil wound around the exterior of said cylinder, and said piston operated to contract in response to collapse of said magnetic field and said cylinder to expand to their original lengths and draw in any fluid via said outlet passage.
Claim 13
Dependent Claim
191 words
A fluid pump for step control machine tool applications assembly comprising: a cylinder having a first and second end, said cylinder formed of a positive magneto-strictive material, an elongate piston of a length shorter than said cylinder and having a first and a second end, said piston formed of a negative magneto-strictive material, said first end of said piston secured to said first end of said cylinder, a cylinder head secured to said cylinder second end and having inlet and outlet passages to the exterior, each said passage including an elongate chamber having a magnetic valve seat, a valve member located in each said chamber, said valve members including permanent magnet means, said magnet means positioned in said valve members such that the comparable ends of said valves have opposite magnetic poles, means to interruptedly apply a magnetic field to said assembly of a first polarity, said means comprises a magnetic coil wound around the exterior of said cylinder, and said piston operated to contract in response to collapse of said magnetic field and said cylinder to expand to their original lengths and draw in any fluid via said outlet passage.
Claim 14
Dependent Claim
26 words
A fluid pump assembly as claimed in claim 11 wherein said piston is formed of an alloy consisting of 49% cobalt, 49% iron and 2% vanadium.
Claim 15
Dependent Claim
32 words
A fluid pump assembly as claimed in claim 11 wherein said means to interruptedly apply a magnetic field to said assembly is operated to apply a magnetic field of a second polarity.
Claim 16
Dependent Claim
47 words
A fluid pump assembly as claimed in claim 11 wherein said means to interruptedly apply a magnetic field to said assembly is operated to apply a magnetic field of a second polarity, said valve members operated in response to said second polarity to reverse their respective positions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |