US3754651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter
Assignee: Individual
•
Filing: 1971-03-19
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Granted: 1973-08-28
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Expires: 1991-03-19
Abstract
Abstract A fluid filter consisting of a helical or spirally wound wire element, a fluid guide pipe disposed within the center of the element and containing a piston-like member responsive to the pressure of the fluid connected to one end of the helical element. When the fluid is pumped, the pressure forces the piston-like member up within the fluid guide pipe, and the helical filter winding is contracted so as to provide effective filtering of dirt and other foreign particles. When no fluid is being pumped and no pressure exists, the piston-like member forces the helical winding into an extended position so as to cause the collected dirt and residue to be cleaned from the winding.
Inventors
- 👤 R Lannoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:45
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
A fluid pump filter, comprising: an elongated helical filter element for filtering the pump fluid; an elongated fluid guide pipe concentrically disposed within said filter element; mounting means rigidly secured at one end of said guide pipe for attaching thereto one end of said filter element; slidable piston means disposed within said guide pipe; means for coupling said piston means to the other end of said filter element; and flowresponsive means constituted by the cooperation of said filter element, said guide pipe and said piston means, by the intermediary of said mounting and said coupling means; thereby to provide (a) a contracted position for said filter element when the pump fluid is made to pass through said guide pipe, keeping said piston means in one end position; as well as (b) an extended position for said filter element when the filter is deactivated and no pump fluid is made to pass, said piston means being in a position spaced apart from said end position, in the same direction as said filter element; whereby residues are accumulated in said guide pipe in said contracted position of the filter element while they are discharged therefrom in said extended position thereof, upon operation of said flow-responsive means, as a result of the movement of said piston means from said end position to said spaced-apart positon.
Claim 2
Dependent Claim
222 words
A fluid pump filter, comprising: an elongated helical filter element for filtering the pump fluid; an elongated fluid guide pipe concentrically disposed within said filter element; mounting means rigidly secured at one end of said guide pipe for attaching thereto one end of said filter element; slidable piston means disposed within said guide pipe; means for coupling said piston means to the other end of said filter element; and flowresponsive means constituted by the cooperation of said filter element, said guide pipe and said piston means, by the intermediary of said mounting and said coupling means; thereby to provide (a) a contracted position for said filter element when the pump fluid is made to pass through said guide pipe, keeping said piston means in one end position; as well as (b) an extended position for said filter element when the filter is deactivated and no pump fluid is made to pass, said piston means being in a position spaced apart from said end position, in the same direction as said filter element; whereby residues are accumulated in said guide pipe in said contracted position of the filter element while they are discharged therefrom in said extended position thereof, upon operation of said flow-responsive means, as a result of the movement of said piston means from said end position to said spaced-apart positon.
Claim 3
Dependent Claim
118 words
The filter as defined in claim 1, wherein said piston member has a weight sufficient to move the same from said end position downward to said spaced-apart position when no pump fluid is made to pass that would keep the same in the upward end position; said piston means is shorter than said guide pipe, thereby allowing in said contracted position of the filter element for a residue collecting space at the bottom of said guide pipe; and wherein said mounting means includes a stop plug above said piston means in a structural member of the pump, for mounting said guide pipe to the outlet of the pump, while said coupling means is substantially below said piston means.
Claim 4
Dependent Claim
90 words
The filter as defined in claim 2, wherein said coupling means includes a circular planar member having a central aperture and the lower end of said filter element rigidly affixed thereto, a rod connected to the lower end of said piston means, and having at its remote end a threaded portion extending through said aperture of the planar member, and at least one fastening means threadably engaging said remote end of the rod for securing said planar member thereto in abutting relationship with said lower end of the filter element.
Claim 5
Dependent Claim
68 words
The filter as defined in claim 3, wherein said guide pipe has a flange at its lower end, opposite said stop plug, for limiting the downward movement of said piston means, and an aperture adjoining said flange, for discharging the residues from said guide tube in said extended position of the filter element when the lower end of said piston means abuts said flange of the guide pipe.
Claim 6
Dependent Claim
113 words
The filter as defined in claim 1, wherein said piston means is an elongated buoyant member which floats in the pump fluid within said guide pipe, sufficient to move said piston means from said end position upward to said spaced-apart position when no pump fluid is made to pass that would keep the same in the downward end position; one end of said guide pipe is rigidly secured to the outlet of the pump; and said mounting means includes a tapered disc secured to said guide pipe and having the lower end of said filter element attached thereto, both substantially below said piston means, while said coupling means is above said piston means.
Claim 7
Dependent Claim
40 words
The filter as defined in claim 5, wherein said coupling means includes a planar member having the upper end of said filter element rigidly affixed thereto, which is abutted and raised by said buoyant member when the filter is deactivated.
Claim 8
Dependent Claim
40 words
The filter as defined in claim 6, further comprising spring means disposed below said buoyant member and abutting a structural member of the pump, for providing additional upward force which assists in moving said buoyant member to said spaced-apart position.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |