Carburetor with power choke

Claim 2

A carburetor comprising a mixture conduit, a choke shaft rotatably disposed in said mixture conduit, a choke valve secured on said shaft, a choke lever secured to said choke shaft, a power element having a cup member open at one end, a mass of thermally expansible material disposed in said cup member, a seal enclosing said material in said cup member, a backing member retaining said seal in said cup member and closing the open end of said cup member and having an opening, and a plunger extending through said opening and received by said seal, said backing and cup members being axially displaceable from said plunger upon thermal expansion of said material, an intermediate shaft, a power element lever rotatably mounted on said intermediate shaft, an intermediate lever rotatably mounted on said intermediate shaft, a link connecting said intermediate lever and said choke lever, a choke closing torsion spring disposed about said intermediate shaft and having one end connected to said intermediate lever and the other end connected to said power element lever whereby said power element lever is biased into engagement with said backing member and whereby said intermediate lever, said link, and said choke lever are biased in a choke valve closing direction, a choke opening torsion spring disposed about said intermediate shaft and having one end connected to an abutment and the other end connected to said intermediate lever whereby said intermediate lever, said link, and said choke lever are biased in a choke valve opening direction, and a power element spring biasing said backing and cup members against axial displacement from said plunger, whereby said backing and cup members and said power element lever are biased to increase the torsion of said choke closing spring to thereby biAs said intermediate lever, said link, and said choke lever in a choke closing direction against the bias of said choke opening spring, and whereby upon thermal expansion of said material said backing and cup members are axially displaced from said plunger against the bias of said power element spring and said power element lever is moved to reduce the torsion of said choke closing spring to thereby permit the bias of said choke opening spring to move said intermediate lever, said link, and said choke lever in a choke opening direction.

Claim 3

The carburetor of claim 1 which further comprises a throttle shaft rotatably disposed in said mixture conduit, a throttle valve secured on said throttle shaft, and a throttle lever secured to said throttle shaft, said throttle lever having an arm engageable with said intermediate lever for moving said intermediate lever, said link, and said choke lever in a choke opening direction as said throttle lever is moved in a throttle opening direction.

Claim 4

The carburetor of claim 1 which further comprises a vacuum break shaft, a vacuum break lever rotatably mounted on said vacuum break shaft and engageable with said intermediate lever for moving said intermediate lever, said link, and said choke lever in a choke opening direction, and a vacuum break unit connected to said vacuum break lever for moving said vacuum break lever into engagement with said intermediate lever.

Claim 5

The carburetor of claim 1 which further comprises a throttle shaft rotatably disposed in said mixture conduit, a throttle valve secured on said throttle shaft, a throttle lever secured to said throttle shaft, and a fast idle lever rotatably mounted on said throttle shaft and engageable with said throttle lever and said power element backing member to limit movement of said throttle lever in a throttle valve closing direction in accordance with the position of said backing member.

Claim 6

The carburetor of claim 1 which further comprises a secondary mixture conduit, a secondary throttle shaft rotatably disposed in said secondary mixture conduit, a secondary throttle valve secured on said secondary throttle shaft, a stop pin secured to said secondary throttle shaft, a lockout shaft, and a lockout lever rotatably mounted on said lockout shaft and engaging said stop pin to prevent movement of said stop pin in a secondary throttle opening direction, and wherein said power element lever includes means engageable with said lockout lever for moving said lockout lever out of engagement with said stop pin as said power element lever is moved to reduce the torsion of said choke closing spring.

Claim 7

The carburetor of claim 1 wherein said power element spring, said backing member, and said cup member are electrically conductive, and which further comprises an electrically conductive heating element disposed adjacent the opposite end of said power element cup member, an electrically insulating sleeve disposed about the sides of said cup member, an electrically conductive cupped housing enclosing said heating element and said insulating sleeve, said housing having a flange receiving said power element spring, and means for passing an electric current through said power element spring, said housing, said heating element, said cup member, and said backing member to energize said heating element and thereby cause thermal expansion of said thermally expansible material.

Claim 8

A carburetor comprising primary and secondary mixture conduits, a choke shaft rotatably disposed in said primary mixture conduit, a choke valve secured on said choke shaft, a choke lever secured to said choke shaft, primary and secondary throttle shafts respectively rotatably disposed in said primary and secondary mixture conduits, primary and secondary throttles respectively secured on said primary and secondary throttles, a primary throttle lever secured to said primary throttle shaft, a power element having a cup member open at one end, a mass of thermally expansible material disposed in said cup member, a seal enclosIng said material in said cup member, a backing member retaining said seal in said cup member and closing the open end of said cup member and having an opening, and a plunger extending through said opening and received by said seal, said backing and cup members being axially displaceable from said plunger upon thermal expansion of said material, an intermediate shaft, a power element lever rotatably mounted on said intermediate shaft, an intermediate lever rotatably mounted on said intermediate shaft, a link connecting said intermediate lever and said choke lever, a choke closing torsion spring disposed about said intermediate shaft and having one end connected to said intermediate lever and the other end connected to said power element lever whereby said power element lever is biased into engagement with said backing member and whereby said intermediate lever, said ink, and said choke ever are biased in a choke valve closing direction, a choke opening torsion spring disposed about said intermediate shaft and having one end connected to an abutment and the other end connected to said intermediate lever whereby said Intermediate lever, said link, and said choke lever are biased in a choke valve opening direction, a power element sPring biasing said backing and cup members against axial displacement from said plunger whereby said backing and cup members and said power element lever are biased to increase the torsion of said choke closing spring to thereby bias said intermediate lever, said link, and said choke lever in a choke closing direction against the bias of said choke opening spring, said backing and cup members being axially displaced from said plunger against the bias of said power element spring upon thermal expansion of said material and said power element lever being moved thereby to reduce the torsion of said choke closing spring and permit the bias of said choke opening spring to move said intermediate lever, said link, and said choke lever in a choke opening direction, said primary throttle lever having an arm engageable with said intermediate lever for moving said intermediate lever, said link, and said choke lever in a choke opening direction as said throttle lever is moved in a throttle opening direction, a vacuum break shaft, a vacuum break lever rotatably mounted on said vacuum break shaft and engageable with said intermediate lever for moving said intermediate lever, said link, and said choke lever in a choke opening direction, a vacuum break unit connected to said vacuum break lever for moving said vacuum break lever into engagement with said intermediate lever, a fast idle lever rotatably mounted on said primary throttle shaft and engageable with said primary throttle lever and said power element backing member to limit movement of said primary throttle lever in a primary throttle valve closing direction in accordance with the position of said backing member, a stop pin secured to said secondary throttle shaft, a lockout shaft, a lockout lever rotatably mounted on said lockout shaft and engaging said stop pin to prevent movement of said stop pin in a secondary throttle opening direction, said power element lever including means engageable with said lockout lever for moving said lockout lever out of engagement with said stop pin as said power element lever is moved to reduce the torsion of said choke closing spring, said power element spring, said backing member, and said cup member being electrically conductive, an electrically conductive heating element disposed adjacent the opposite end of said power element cup member, an electrically insulatinG sleeve disposed about the sides of said cup member, on electrically conductive cupped housing enclosing said heating element and said insulating sleeve, said housing having a flange receiving said power element spring, and means for passing an electric current through said power element spring, said housing, said heating element, said cup member, and said backing member to energize said heating element and theReby cause thermal expansion of said thermally expansible material.

Claim 9

A carburetor comprising primary and secondary mixture conduits, a choke shaft rotatably disposed in said primary mixture conduit, a choke valve secured on said choke shaft, a choke lever secured to said choke shaft, primary and secondary throttle shafts respectively rotatably disposed in said primary and secondary mixture conduits, primary and secondary throttles respectively secured on said primary and secondary throttles, a primary throttle lever secured to said primary throttle shaft, a power element having a cup member open at one end, a mass of thermally expansible material disposed in said cup member, a seal enclosIng said material in said cup member, a backing member retaining said seal in said cup member and closing the open end of said cup member and having an opening, and a plunger extending through said opening and received by said seal, said backing and cup members being axially displaceable from said plunger upon thermal expansion of said material, an intermediate shaft, a power element lever rotatably mounted on said intermediate shaft, an intermediate lever rotatably mounted on said intermediate shaft, a link connecting said intermediate lever and said choke lever, a choke closing torsion spring disposed about said intermediate shaft and having one end connected to said intermediate lever and the other end connected to said power element lever whereby said power element lever is biased into engagement with said backing member and whereby said intermediate lever, said ink, and said choke ever are biased in a choke valve closing direction, a choke opening torsion spring disposed about said intermediate shaft and having one end connected to an abutment and the other end connected to said intermediate lever whereby said Intermediate lever, said link, and said choke lever are biased in a choke valve opening direction, a power element sPring biasing said backing and cup members against axial displacement from said plunger whereby said backing and cup members and said power element lever are biased to increase the torsion of said choke closing spring to thereby bias said intermediate lever, said link, and said choke lever in a choke closing direction against the bias of said choke opening spring, said backing and cup members being axially displaced from said plunger against the bias of said power element spring upon thermal expansion of said material and said power element lever being moved thereby to reduce the torsion of said choke closing spring and permit the bias of said choke opening spring to move said intermediate lever, said link, and said choke lever in a choke opening direction, said primary throttle lever having an arm engageable with said intermediate lever for moving said intermediate lever, said link, and said choke lever in a choke opening direction as said throttle lever is moved in a throttle opening direction, a vacuum break shaft, a vacuum break lever rotatably mounted on said vacuum break shaft and engageable with said intermediate lever for moving said intermediate lever, said link, and said choke lever in a choke opening direction, a vacuum break unit connected to said vacuum break lever for moving said vacuum break lever into engagement with said intermediate lever, a fast idle lever rotatably mounted on said primary throttle shaft and engageable with said primary throttle lever and said power element backing member to limit movement of said primary throttle lever in a primary throttle valve closing direction in accordance with the position of said backing member, a stop pin secured to said secondary throttle shaft, a lockout shaft, a lockout lever rotatably mounted on said lockout shaft and engaging said stop pin to prevent movement of said stop pin in a secondary throttle opening direction, said power element lever including means engageable with said lockout lever for moving said lockout lever out of engagement with said stop pin as said power element lever is moved to reduce the torsion of said choke closing spring, said power element spring, said backing member, and said cup member being electrically conductive, an electrically conductive heating element disposed adjacent the opposite end of said power element cup member, an electrically insulatinG sleeve disposed about the sides of said cup member, on electrically conductive cupped housing enclosing said heating element and said insulating sleeve, said housing having a flange receiving said power element spring, and means for passing an electric current through said power element spring, said housing, said heating element, said cup member, and said backing member to energize said heating element and theReby cause thermal expansion of said thermally expansible material.