Patent US3741241A successfully refreshed from Google Patents.
US3741241A
Expired / Lapsed
US
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Hydraulic fuse
Assignee: Eaton Corp
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Filing: 1971-07-29
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Granted: 1973-06-26
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Expires: 1991-07-29
Abstract
Abstract A hydraulic fuse includes a body defining a cylindrical bore therethrough. A tubular piston including a radially extending opening therein is located in the cylindrical bore of the body and is resiliently biased to a normally open position. The tubular piston member is of low mass and is movable against the force of a resilient biasing means in response to fluid flow quantities above a predetermined maximum. During movement of the tubular piston against the force of the resilient biasing means the internal wall of the cylindrical bore partially closes the radial opening in the tubular piston member thereby increasing the pressure drop across the piston member and further urging the piston member to move to a no-flow or closed position. The tubular piston member may be provided with a pilot flow opening therethrough so that a predetermined quantity of flow may exist across the piston member when the radial opening therein has been completely closed.
Inventors
- 👤 H Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:36
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/24; F16K17/28; F16K17/30; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
A hydraulic fuse comprising: a body member having a circular bore defining a fluid flow path therethrough, a thin-walled tubular cylindrical piston member loosely received within said bore for sliding movement relative thereto between a first position and a second position, said tubular piston member being open at the downstream end thereof and closed at the upstream end and having an opening in a radial wall portion thereof adjacent said closed end, said radial wall portion extending beyond said bore to provide a flow path through the fuse which is radial to said tubular piston at said opening in a radial wall adjacent the upstream end thereof and axial to said piston at the downstream end thereof, said radial wall portion cooperating with said bore to reduce the area of the flow path through the fuse when the piston moves from said first position toward said second position, and means providing a predetermined biasing force between the body and the piston urging the piston toward said first position whereby a fluid flow rate beyond a preselected level in the direction from said first position toward said second position will move the piston to said second position thereby closing off said flow path.
Claim 2
Dependent Claim
202 words
A hydraulic fuse comprising: a body member having a circular bore defining a fluid flow path therethrough, a thin-walled tubular cylindrical piston member loosely received within said bore for sliding movement relative thereto between a first position and a second position, said tubular piston member being open at the downstream end thereof and closed at the upstream end and having an opening in a radial wall portion thereof adjacent said closed end, said radial wall portion extending beyond said bore to provide a flow path through the fuse which is radial to said tubular piston at said opening in a radial wall adjacent the upstream end thereof and axial to said piston at the downstream end thereof, said radial wall portion cooperating with said bore to reduce the area of the flow path through the fuse when the piston moves from said first position toward said second position, and means providing a predetermined biasing force between the body and the piston urging the piston toward said first position whereby a fluid flow rate beyond a preselected level in the direction from said first position toward said second position will move the piston to said second position thereby closing off said flow path.
Claim 3
Dependent Claim
30 words
The hydraulic fuse of claim 1 wherein said body member has a counterbore axially disposed at one end of said bore, and said radial wall portion extends into said counterbore.
Claim 4
Dependent Claim
101 words
The hydraulic fuse of claim 1 wherein said body member has a counterbore axially disposed at each end of said bore, said tubular piston member has a flange at one end thereof and said biasing means comprises a spring engaging said flange, one of said counterbores cooperating with said radial wall portion of said tubular member to define a portion of the flow path through the fuse, while the other of said counterbores provides a housing for said spring and said flange and means for said spring to act against to bias said flange and said piston to said first position.
Claim 5
Dependent Claim
36 words
The fuse of claim 1 wherein said tubular piston member has a secondary flow opening in the closed end thereof providing a leakage flow path through the fuse when said piston is in said second position.
Claim 6
Dependent Claim
30 words
The fuse of claim 1 wherein the area of the opening in the radial surface is substantially equal to the area defined by the internal wall of the tubular piston.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |