Patent US3880053A successfully refreshed from Google Patents.
US3880053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump
Assignee: FIRST ROBBINSDALE STATE BANK
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Filing: 1974-05-31
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Granted: 1975-04-29
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Expires: 1994-05-31
Abstract
Abstract An improved pump structure, for use in pharmaceutical manufacturing, particularly designed to prevent contamination of the liquid being pumped by particulate matter, to operate under continuous pressure without leakage, and to be easily disassembled for cleaning and sterilization. It comprises a cylinder and cylinder head defining a space within which a piston assembly is reciprocated. A rolling diaphram is part of the piston assembly, and is clamped between the cylinder and cylinder head to divide the space into separate portions. The check valve produces a negative pressure in one of the portions, ensuring proper operation of the diaphram in the space between the piston and the cylinder. Inlet and outlet connections are made at the cylinder head, to that the cylinder and piston assembly are readily removable for servicing.
Inventors
- 👤 Hans W Trechsel
- 👤 Allan B Larson
- 👤 John A Ryerse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:06
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B15/00; F04B43/00; F04B43/02; F04B53/16; F04B53/162
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
243 words
In a pump, in combination: a piston assembly including a hollow piston shaft, a hollow skirted piston mounted on one end of said shaft, and a piston head overlying said piston and including a central rod to be received in said shaft; a cylinder of larger internal diameter than the diameter of said hollow skirted piston; a cylinder head having inlet and outlet ports; means removably securing said cylinder head to said cylinder; guide means in said cylinder slidably mounting said piston shaft for linear reciprocation of said piston assembly in said cylinder; a rolling diaphram having an apertured central portion for clamping between said piston head and said hollow skirted piston, a peripheral portion for clamping between said cylinder head and said cylinder, and an intermediate portion reentrantly contained between said cylinder and hollow skirted piston, to divide the space within said cylinder and head into separate portions adjacent to and remote from said cylinder head; a tappet member received in said piston shaft and releasably engaging said central rod of said piston head, for retaining said piston head in clamping relation to said piston and for imparting axial motion to said piston assembly; and spring means acting between said cylinder and said tappet member to normally urge said piston assembly in a direction away from said cylindEr head, so that upon releasing the first named means the tappet member, main spring, cylinder, and piston assembly may be removed as a unit.
Claim 2
Dependent Claim
243 words
In a pump, in combination: a piston assembly including a hollow piston shaft, a hollow skirted piston mounted on one end of said shaft, and a piston head overlying said piston and including a central rod to be received in said shaft; a cylinder of larger internal diameter than the diameter of said hollow skirted piston; a cylinder head having inlet and outlet ports; means removably securing said cylinder head to said cylinder; guide means in said cylinder slidably mounting said piston shaft for linear reciprocation of said piston assembly in said cylinder; a rolling diaphram having an apertured central portion for clamping between said piston head and said hollow skirted piston, a peripheral portion for clamping between said cylinder head and said cylinder, and an intermediate portion reentrantly contained between said cylinder and hollow skirted piston, to divide the space within said cylinder and head into separate portions adjacent to and remote from said cylinder head; a tappet member received in said piston shaft and releasably engaging said central rod of said piston head, for retaining said piston head in clamping relation to said piston and for imparting axial motion to said piston assembly; and spring means acting between said cylinder and said tappet member to normally urge said piston assembly in a direction away from said cylindEr head, so that upon releasing the first named means the tappet member, main spring, cylinder, and piston assembly may be removed as a unit.
Claim 3
Dependent Claim
38 words
Apparatus according to claim 1 together with means effective during operation of said pump to maintain a reduced pressure in the portion of said space remote from said cylinder head, to ensure controlled operation of said rolling diaphram.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 2 in which the last named means includes a ball check valve in a passage through the wall of said cylinder.
Claim 5
Dependent Claim
25 words
Apparatus according to claim 3 in which said guide means is removably mounted in said cylinder and retains said ball check valve in said passage.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 1 together with means limiting the travel of said piston assembly under the action of said main spring.
Claim 7
Dependent Claim
22 words
Apparatus according to claim 1 which said guide means comprises a removable insert of material having a low coefficient of sliding friction.
Claim 8
Dependent Claim
21 words
Apparatus according to claim 1 in which said tappet member includes a concave outer end having a central convex spherical contactor.
Claim 9
Dependent Claim
20 words
Apparatus according to claim 1 in which said cylinder head includes means for suspending said pump over a tappet actuator.
Claim 10
Dependent Claim
25 words
Apparatus according to claim 1 in which said cylinder head and said piston head are of stainless steel and said rolling diaphram is of silicone.
Claim 11
Dependent Claim
55 words
Apparatus according to claim 1 in which said tappet member includes a bifurcated double tapered end and said rod includes a shaped aperture to receive and release said double tapered end in response to axial force, applied between said tappet member and said rod, of greater magnitude than the force exerted by said main spring.
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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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |