US3914958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam drive pump refrigerators
Assignee: Individual
•
Filing: 1973-10-23
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Granted: 1975-10-28
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Expires: 1993-10-23
Abstract
Abstract This is a counter-bevelled cam drive piston pump with optional multiple stages of compression and vacuum pumping for use in compression pumping, vacuum pumping and open or closed cycle refrigeration.
Inventors
- 👤 Daniel E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:09
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/02; F04B9/00; F04B9/02; F04B9/04; F04B9/047; F25; F25B; F25B1/00; F25B1/10; F25B9/00; F25B9/002; F25B9/004
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
366 words
A multiple-staged cam drive pump refrigerator having a housing, a rotationAl power source, a drive shaft attached to the rotational power source and in rotational contact with the housing, a sleeve attached to the drive shaft, a counterbevelled cam drive groove in separated end cam relationship around the inside periphery of the sleeve, a transverse guide having channels parallel to the drive shaft and rigidly attached to the housing, a double-ended pump cylinder rigidly attached to the housing, a double-ended pump piston in slidable contact with the inside of the cylinder, a piston shaft attached to one side of the piston and extended in slidable contact through the cylinder head at one end of the double-acting cylinder, cam follower teeth extended radially from the shaft in slidable contact with the surfaces of the transverse guide and with the surfaces of the counter-bevelled cam drive, a connecting fluid conveyance in communication between the portion of the cylinder at one head of the piston and the portion of the cylinder at the opposite head of the piston, a fluid conveyance in communication between the inside and the outside of each end of the cylinder, pump valves that are caused to be open when the piston is traveling away from and closed when it is traveling towards the cylinder heat at the conveyance between the inside and the outside of the cylinder at intake end of the cylinder, pump outlet valves that are caused to be closed when the piston is traveling away from and open when it is traveling towards the cylinder head at the conveyance between the inside and the outside of the cylinder at the outlet end of the cylinder, connecting conveyance pump valves that are caused to be closed when the piston is traveling away from and open when it is traveling towards the cylinder head at the intake end of the cylinder, connecting conveyance pump valves that are caused to be open when the piston is traveling away from and closed when it is traveling towards the cylinder heat at the outlet end of the cylinder, and a heat exchanger at the connecting fluid conveyance between the intake and outlet ends of the cylinder.
Claim 2
Dependent Claim
366 words
A multiple-staged cam drive pump refrigerator having a housing, a rotationAl power source, a drive shaft attached to the rotational power source and in rotational contact with the housing, a sleeve attached to the drive shaft, a counterbevelled cam drive groove in separated end cam relationship around the inside periphery of the sleeve, a transverse guide having channels parallel to the drive shaft and rigidly attached to the housing, a double-ended pump cylinder rigidly attached to the housing, a double-ended pump piston in slidable contact with the inside of the cylinder, a piston shaft attached to one side of the piston and extended in slidable contact through the cylinder head at one end of the double-acting cylinder, cam follower teeth extended radially from the shaft in slidable contact with the surfaces of the transverse guide and with the surfaces of the counter-bevelled cam drive, a connecting fluid conveyance in communication between the portion of the cylinder at one head of the piston and the portion of the cylinder at the opposite head of the piston, a fluid conveyance in communication between the inside and the outside of each end of the cylinder, pump valves that are caused to be open when the piston is traveling away from and closed when it is traveling towards the cylinder heat at the conveyance between the inside and the outside of the cylinder at intake end of the cylinder, pump outlet valves that are caused to be closed when the piston is traveling away from and open when it is traveling towards the cylinder head at the conveyance between the inside and the outside of the cylinder at the outlet end of the cylinder, connecting conveyance pump valves that are caused to be closed when the piston is traveling away from and open when it is traveling towards the cylinder head at the intake end of the cylinder, connecting conveyance pump valves that are caused to be open when the piston is traveling away from and closed when it is traveling towards the cylinder heat at the outlet end of the cylinder, and a heat exchanger at the connecting fluid conveyance between the intake and outlet ends of the cylinder.
Claim 3
Dependent Claim
45 words
A multiple-staged cam drive pump refrigerator as described in claim 1 and having a heat exchanger at the connecting conveyance means between the intake and outlet ends of the cylinder, and a cooler in fluid communication between the intake and outlet ends of the cylinder.
Claim 4
Dependent Claim
55 words
A multiple-staged cam drive pump refrigerator as described in claim 1 and having a heat exchanger at the connecting fluid conveyance means between the intake and outlet ends of the cylinder, and a fluid-flow restriction at the outlet end of the heat exchanger upstream of the fluid conveyance into the outlet end of the cylinder.
Claim 5
Dependent Claim
76 words
A multiple-staged cam drive pump refrigerator as described in claim 1 and having a heat exchanger at the connecting fluid conveyance between the intake and outlet ends of the cylinder, a fluid restriction at the outlet end of the heat exchanger upstream of entry of the fluid into the outlet end of the cylinder, a collector box in fluid communication between the restriction and the entry of the fluid into the outlet end of the cylinder.
Claim 6
Dependent Claim
283 words
A multiple-staged cam drive pump refrigerator having a rotational power source, a housing at each side of the power source, a drive shaft sleeve at each side of the power source in rotatable contact with the respective housings, counter-bevelled cam drive grooves in separated end cam relationship around the inside periphery of each sleeve, transverse guides having channels parallel to the drive shaft and rigidly attached to each of the housings, a double-ended pump cylinder rigidly attached to each housing, double-ended pump pistons in slidable contact with the inside of each cylinder, conveyances in fluid communication between the cylinder at one side of the power source and the cylinder at the other side of the power source, a conveyance in fluid communication into the cylinder at one side of the power source, a conveyance in fluid communication out of the cylinder at the opposite side of the Power source, ports with pump valves in one-way working relationship into and out of the cylinder at one side of the power source upstream of entry into the conveyance between said cylinders at opposite sides of said power source, ports with pump valves in one-way working relationship into and out of the cylinder at the opposite side of said power source downstream from the said conveyance between the said cylinders at opposite sides of said power source, conveyances between the portions of the cylinders at the opposite sides of the pistons in each respective cylinder, ports thereat with pump valves in one-way working relationship into and out of the said opposite ends of the said cylinders, and a heat exchanger at the conveyance between the cylinders that are positioned at opposite sides of the power source.
Claim 7
Dependent Claim
283 words
A multiple-staged cam drive pump refrigerator having a rotational power source, a housing at each side of the power source, a drive shaft sleeve at each side of the power source in rotatable contact with the respective housings, counter-bevelled cam drive grooves in separated end cam relationship around the inside periphery of each sleeve, transverse guides having channels parallel to the drive shaft and rigidly attached to each of the housings, a double-ended pump cylinder rigidly attached to each housing, double-ended pump pistons in slidable contact with the inside of each cylinder, conveyances in fluid communication between the cylinder at one side of the power source and the cylinder at the other side of the power source, a conveyance in fluid communication into the cylinder at one side of the power source, a conveyance in fluid communication out of the cylinder at the opposite side of the Power source, ports with pump valves in one-way working relationship into and out of the cylinder at one side of the power source upstream of entry into the conveyance between said cylinders at opposite sides of said power source, ports with pump valves in one-way working relationship into and out of the cylinder at the opposite side of said power source downstream from the said conveyance between the said cylinders at opposite sides of said power source, conveyances between the portions of the cylinders at the opposite sides of the pistons in each respective cylinder, ports thereat with pump valves in one-way working relationship into and out of the said opposite ends of the said cylinders, and a heat exchanger at the conveyance between the cylinders that are positioned at opposite sides of the power source.
Claim 8
Dependent Claim
59 words
A multiple-staged cam drive pump refrigerator as described in claim 5 and having a heat exchanger at the conveyance between the cylinders that are positioned at opposite sides of the power source, and a cooler in fluid communication between the opposite inlet and outlet conveyances to those which are in fluid communication with the heat exchanger between said cylinders.
Claim 9
Dependent Claim
69 words
A multiple-staged pump refrigerator as described in claim 5 and having a heat exchanger at the conveyance between the cylinders that are positioned at opposite sides of the power source, a coller in fluid communication between the opposite inlet and outlet conveyances to those which are in fluid communication with the heat exchanger between said cylinders, and a fluid flow restrictor at the outlet end of the heat exchanger.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |