US3851523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing carburetors
Assignee: SCANS ASS INC US
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Filing: 1972-07-13
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Granted: 1974-12-03
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Expires: 1992-07-13
Abstract
Abstract This application discloses an improved apparatus for testing carburetors on production basis and giving simultaneously with the test continuous and direct indication of the mixture ratio produced by test carburetors, as well as deviation of such mixtures from prescribed standard. The apparatus is adapted to reproduce in a test carburetor a predetermined air flow and manifold vacuum known to occur in such carburetors at a certain point of its operation. With such air flow inducing a definite fuel flow in a test carburetor, the rate of fuel flow is measured and amplified. The signals produced by the measuring device, which signals may be pneumatic, electric or hydraulic, are impressed on an analog computer capable of dividing one value by the other and thus to produce another signal related to or representative of the mixture ratio produced by the carburetor. Such ratio is indicated on a specially graduated pressure indicating device, or an electric indicating device, and thus gives a direct and continuous reading of the mixture ratio produced by the carburetor. The construction disclosed is substantially similar to that disclosed in the U.S. Pat. No. 3,517,552 and U.S. Pat. No. 3,524,344, the main difference being found in the fact that in the present construction, the air flow measurements are made on the upstream side of the test carburetor rather than on the downstream side thereof as in the abovementioned patents.
Inventors
- 👤 V Converse
- 👤 A Lizzio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:50
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
230 words
An apparatus for testing carburetors at a plurality of points of operation range thereof, said apparatus including a sealed chamber adapted to sealingly receive a test carburetor and hold it in place during the test, a venturi meter having a throat adapted to be operated critically at all points of its operating range outside said chamber and sealingly connected to said chamber on the upstream side of the carburetor throttle, means to create vacuum on the downstream side of the carburetor throttle, measuring means entirely on the upstream side of said venturi meter adapted to measure the actual rate of air flow to produce a continuous sensible signal related to said rate, means adapted to measure the actual rate of the resulting fuel flow through the carburetor to produce a second continuous sensible signal related to said rate of fuel flow, a device adapted to receive and to divide the value of one signal by the value of the other signal and thus to produce a third continuous signal related to the ratio of said two signals, an indicating device responsive to said third signal and adapted to give a continuous indication related to the mixture ratio produced by the test carburetor, and an air pressure and temperature device entirely upstream of said venturi meter adapted to provide a source of conditioned air to be drawn through the test carburetor.
Claim 2
Independent Claim
230 words
An apparatus for testing carburetors at a plurality of points of operation range thereof, said apparatus including a sealed chamber adapted to sealingly receive a test carburetor and hold it in place during the test, a venturi meter having a throat adapted to be operated critically at all points of its operating range outside said chamber and sealingly connected to said chamber on the upstream side of the carburetor throttle, means to create vacuum on the downstream side of the carburetor throttle, measuring means entirely on the upstream side of said venturi meter adapted to measure the actual rate of air flow to produce a continuous sensible signal related to said rate, means adapted to measure the actual rate of the resulting fuel flow through the carburetor to produce a second continuous sensible signal related to said rate of fuel flow, a device adapted to receive and to divide the value of one signal by the value of the other signal and thus to produce a third continuous signal related to the ratio of said two signals, an indicating device responsive to said third signal and adapted to give a continuous indication related to the mixture ratio produced by the test carburetor, and an air pressure and temperature device entirely upstream of said venturi meter adapted to provide a source of conditioned air to be drawn through the test carburetor.
Claim 3
Dependent Claim
73 words
The apparatus defined in claim 1, with the venturi meter thereof having a control cone mounted within the venturi passage and moveable therein to vary selectively the effective area of the venturi throat and thus to vary correspondingly the air mass flow rate, and measuring means relating position of said moveable control cone to the air mass flow rates at positions of said control cone throughout the operation range of the venturi meter.
Claim 4
Dependent Claim
30 words
The apparatus defined in claim 2, and including two variable area critical flow venturi meters, both provided on the upstream side of the test carburetor throttle and arranged in parallel.
Claim 5
Independent Claim
231 words
An apparatus for testing carburetors at a plurality of points of the operation range thereof, said apparatus including a sealed chamber adapted to receive sealingly a test carburetor and to hold it in place during the test, a conduit outside of said sealed chamber having a plurality of laminar flow units operatively arranged therein and sealingly connected to said chamber on the upstream side of the carburetor throttle, means to create vacuum on the downstream side of the carburetor throttle, measuring means upstream of said laminar flow unit to measure the actual rate of air flow in order to produce a continuous sensible signal related to said rate, means to measure the actual rate of the resulting fuel flow through the carburetor in order to produce a second continuous sensible signal related to said rate of fuel flow, a device adapted to receive and to divide the value of one signal by the value of the other signal and thus to produce a third continuous signal related to the ratio of said two signals, and an indicating device responsive to said third signal and adapted to give a continuous indication related to the mixture ratio produced by the test carburetor, and an air pressure and temperature device provided entirely upstream of said laminar flow units and adapted to produce a source of conditioned air to be drawn through the test carburetor.
Claim 6
Independent Claim
231 words
An apparatus for testing carburetors at a plurality of points of the operation range thereof, said apparatus including a sealed chamber adapted to receive sealingly a test carburetor and to hold it in place during the test, a conduit outside of said sealed chamber having a plurality of laminar flow units operatively arranged therein and sealingly connected to said chamber on the upstream side of the carburetor throttle, means to create vacuum on the downstream side of the carburetor throttle, measuring means upstream of said laminar flow unit to measure the actual rate of air flow in order to produce a continuous sensible signal related to said rate, means to measure the actual rate of the resulting fuel flow through the carburetor in order to produce a second continuous sensible signal related to said rate of fuel flow, a device adapted to receive and to divide the value of one signal by the value of the other signal and thus to produce a third continuous signal related to the ratio of said two signals, and an indicating device responsive to said third signal and adapted to give a continuous indication related to the mixture ratio produced by the test carburetor, and an air pressure and temperature device provided entirely upstream of said laminar flow units and adapted to produce a source of conditioned air to be drawn through the test carburetor.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |