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US3618909A Expired / Lapsed US ⏱️ 0.0 years remaining

Evaporation-inhibiting device for a carburetor

Assignee: Toyota Motor Corp
•
Filing: 1969-04-30
•
Granted: 1971-11-09
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Expires: 1989-04-30
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Abstract

Abstract The present invention relates to a device for inhibiting fuel evaporation in a carburetor, said device comprising a variablecapacity bag which communicates with a float chamber in the carburetor and the internal volume of which can be varied by an operating device, a first one-way valve is positioned between said bag and said float chamber, and a second one-way valve through which said bag is connected to a fuel supply line located upstream of a fuel pump, said operating device being so controlled as to increase or decrease the internal volume of said bag in dependence on whether the engine is running or stopped. A certain amount of the fuel in the float chamber is introduced into the sealed variable capacity bag outside of the float chamber when the engine is stopped so as to minimize the amount of fuel in the float chamber, to inhibit the evaporation of fuel and thereby prevent the release of unburnt hydrocarbons.

Inventors

  • 👤 Tadahide Toda
  • 👤 Mitsumasa Yamada
  • 👤 Hidekatsu Miyake

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 16:08
CPC Classifications
F; F02; F02M; F02M5/00; F02M5/12

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 193 words
Device for inhibiting the evaporation of fuel in a fuel supply system comprising a carburetor having a float chamber, a fuel supply line connecting said carburetor to a fuel tank, and a fuel pump in said fuel supply line, said device comprising: a variable-volume bag in communication with said float chamber, an operating device for varying the volume of said bag, a first one-way valve through which said bag is connected to said float chamber and which permits flow only in the direction of said bag, a second one-way valve through which said bag is connected to the fuel supply line upstream of the fuel pump and which permits flow only in the direction of said fuel supply line, an airtight chamber housing said bag and connected to the air intake for the carburetor downstream of the throttle valve in said carburetor, said operating device being connected to decrease the internal volume of said bag when said engine is started and said bag being so mounted within said chamber that the negative pressure received by said chamber from said air intake at the instant the engine is started assists in contracting said bag.
Claim 2
Dependent Claim 193 words
Device for inhibiting the evaporation of fuel in a fuel supply system comprising a carburetor having a float chamber, a fuel supply line connecting said carburetor to a fuel tank, and a fuel pump in said fuel supply line, said device comprising: a variable-volume bag in communication with said float chamber, an operating device for varying the volume of said bag, a first one-way valve through which said bag is connected to said float chamber and which permits flow only in the direction of said bag, a second one-way valve through which said bag is connected to the fuel supply line upstream of the fuel pump and which permits flow only in the direction of said fuel supply line, an airtight chamber housing said bag and connected to the air intake for the carburetor downstream of the throttle valve in said carburetor, said operating device being connected to decrease the internal volume of said bag when said engine is started and said bag being so mounted within said chamber that the negative pressure received by said chamber from said air intake at the instant the engine is started assists in contracting said bag.
Claim 3
Dependent Claim 50 words
Device as claimed in claim 1, in which said operating device is an electromagnetic device which is actuated by the ignition switch of an engine, said bag is spring biassed toward an expanded position, and said electromagnetic device is adapted, when actuated, to overcome said bias and contract said bag.
Claim 4
Dependent Claim 44 words
Device as claimed in claim 1, wherein said operating device is a pressure responsive device and is connected through a pressure-regulating valve to an engine lubricating oil supply line, whereby the pressure of the lubricating oil in said line causes contraction of said bag.

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) 1974-11-08 1975-05-10 1975-11-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-11-08 1979-05-10 1979-11-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-11-08 1983-05-10 1983-11-09 $7700.00 Window Closed / Lapsed

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