Adjust screw device for carburetor
AssigneesToyota Jidosha Kogyo Kabushiki Kaisha, Aisan Kogyo Kabushiki Kaisha
InventorsYuzo Kato, Hidenori Tateno, Mikitoshi Kako
Life of this patent
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Abstract
An adjust screw device for use with a carburetor of an internal combustion engine having stops for restricting the range within which the automobile user can readjust the idle R.P.M. by adjusting the adjust screw at the carburetor. The adjust screw device is composed majorly of a first adjust screw having a large adjustable range and a second adjust screw for fine adjustment, the physical position of the second adjust screw being changed by the adjustment of the first adjust screw. After initial adjustment of the first adjust screw by the manufacturer, further adjustment of the screw is completely blocked and the second adjust screw is then adjustable by the user only over a predetermined range.
Claims26
An adjustment screw device for a carburetor for an internal combustion engine, said carburetor having a throttle lever for controlling a throttle valve, and for installation on a stationary member in the vicinity of the throttle lever, the device comprising:
- a first adjust screw rotatable with respect to the stationary member over a relatively large range for initially presetting the R.P.M. of the engine;
- a second adjust screw for relatively finely adjusting of the R.P.M. of the engine, the leading end of said second adjust screw abutting the throttle lever, said second adjust screw being continuously accessible for adjustment;
- means for moving said second adjust screw to and from said throttle lever in accordance with the rotation of said first adjust screw;
- and
- means for blocking access to said first adjust screw after said initial presetting.
An adjustment screw device for a carburetor having a throttle valve comprising:
- lever means for positioning said throttle valve;
- a fine adjust screw acting directly on said lever means, said fine adjust screw being continuously accessible for adjustment;
- an initial adjust screw rotatable over a relatively large range with respect to a fixed position for initially presetting the R.P.M. of the engine, said initial adjust screw acting indirectly on said lever means through said fine adjust screw;
- means for blocking access to said initial adjust screw after said initial presetting.
An adjustment screw device for a carburetor of an internal combustion engine, said carburetor having a throttle valve and the device being for installation in a fixed member of the engine or carburetor, said device comprising:
- a lever member for positioning said throttle valve;
- a sleeve having a threaded outer surface for adjustably engaging a threaded through bore in said fixed member;
- a substantially cylindrical fine adjust screw having a threaded portion substantially centrally located between its end for insertion into said sleeve, the leading end of said adjust screw engaging an abutment surface of said lever member and said threaded portion engaging a threaded inner surface portion of said sleeve;
- an enlarged unthreaded bore portion of the inner surface of said sleeve forming a shoulder in said sleeve;
- an annular member on the surface of said cylindrical adjust screw for engagement with said shoulder and limiting the movement of said fine adjust screw outwardly away from said lever member;
- an annular stop bush press-fitted into said bore portion of said sleeve around said fine adjust screw for determining the limit of the inward movement of said fine adjust screw toward said lever member;
- at least one keyway in the threaded outer surface of said sleeve, said keyway extending into the area of the bore in said fixed member;
- a locking key for insertion into said keyway after the rotational adjustment of said sleeve relative to said fixed member for presetting the initial R.P.M. of said member, said locking key preventing further rotation of said sleeve with respect to said fixed member;
- a washer positioned on the outer end of said fine adjust screw;
- means for retaining said washer on said fine adjust screw;
- and
- a compression spring mounted around said fine adjust screw and captured between said fixed member and said washer.
Dependencies are inferred from the claim text.