US3724504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for establishing a variation of time delay between input and output fluid signals
Assignee: Denso Corp
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Filing: 1971-03-26
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Granted: 1973-04-03
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Expires: 1991-03-26
Abstract
Abstract Apparatus for establishing a variation of time delay between input and output fluid signals comprising a variable-circuitlength body and a pressure-activated body, said device being so constructed that a fluid signal applied to a power supply port on said first body may be delayed in time according to a variation of pressure in the pressure-activated body, said variablecircuit-length body being provided with spiral grooves for delaying the fluid signal.
Inventors
- 👤 K Matsui
- 👤 H Tsubouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:42
CPC Classifications
F; F16; F16K; F16K47/00; F16K47/08; F16K47/12; F15; F15B; F15B21/00; F15B21/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
194 words
Apparatus for establishing a variation of time delay between input and output fluid signals comprising: a variable-circuit length body and; a pressure-activated body; said variable-circuit-length body comprising a cylinder, a plunger slideably disposed therein, inlet and outlet ports disposed in said cylinder, a spiral groove in communication with said input port and formed between said cylinder and said plunger, a passage in the cylinder in communication with said outlet port; said pressure-actuated body comprising: two partitioned chambers, one of which communicates with a pressure source, said plunger secured to a displaceable partition member forming said partition chambers so as to be displaceable in response to the pressure difference between said two chambers; said plunger being provided with a passage formed therein and having ports, one of which communicates with a part of said spiral groove and the other of which communicates with a part of said first mentioned passage in communication with said outlet port, whereby the circuit length between said inlet and outlet ports may be varied in response to the displacement of said plunger and variation of time delay for the fluid signal between the inlet and outlet ports may be established.
Claim 2
Dependent Claim
194 words
Apparatus for establishing a variation of time delay between input and output fluid signals comprising: a variable-circuit length body and; a pressure-activated body; said variable-circuit-length body comprising a cylinder, a plunger slideably disposed therein, inlet and outlet ports disposed in said cylinder, a spiral groove in communication with said input port and formed between said cylinder and said plunger, a passage in the cylinder in communication with said outlet port; said pressure-actuated body comprising: two partitioned chambers, one of which communicates with a pressure source, said plunger secured to a displaceable partition member forming said partition chambers so as to be displaceable in response to the pressure difference between said two chambers; said plunger being provided with a passage formed therein and having ports, one of which communicates with a part of said spiral groove and the other of which communicates with a part of said first mentioned passage in communication with said outlet port, whereby the circuit length between said inlet and outlet ports may be varied in response to the displacement of said plunger and variation of time delay for the fluid signal between the inlet and outlet ports may be established.
Claim 3
Dependent Claim
61 words
Apparatus for establishing a variation of time delay between input and output fluid signals according to claim 1 wherein said first mentioned passage in communication with said outlet port is a groove which is formed in a part of the inner surface of said cylinder in the axial direction thereof and in hydraulically or pneumatically space-apart relation with said spiral groove.
Claim 4
Dependent Claim
90 words
Apparatus for establishing a variation of time delay between input and output fluid signals according to claim 1 further comprising a second cylinder disposed between said first cylinder and the plunger, first and second spiral grooves formed in the other surface of said second cylinder, said inlet port being communicated with said second spiral groove, and radial bores drilled from the bottom end of each coil of said first and second spiral grooves so as to open into the cylinder bore of said cylinder into which is fItted said plunger.
Claim 5
Dependent Claim
68 words
Apparatus for establishing a variation of time delay between input and output fluid signals according to claim 3 further comprising: two spaced-apart annular grooves being formed in a peripheral surface of said plunger and interconnected with each other through the passage formed within said plunger so that the fluid pressure from said inlet port may be transmitted to said outlet port only through said passage in said plunger.
Claim 6
Dependent Claim
42 words
Apparatus for establishing a variation of time delay between input and output fluid signals according to claim 4 wherein the pitch of the coils of said spiral groove close to said outlet port is smaller than the pitch of the other coils.
References Cited (Backward Citations)
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |