US 7,097,164 B2Granted

Limiter cap for carburetor

AssigneeDolmar GmbH

InventorsChristian Vick, Carsten Ziegs

Life of this patent

Estimating the term…

Loading patent…

Abstract

In order to improve a limiter cap (300; 300′) for limiting the adjustability of at least two set screws or valves (200), which are arranged side by side, with each set screw or valve (200) including at least one retaining nose or stop leg (240), extending in the transition area between the screw head (210) and the screw needle or valve needle (220) in a ring shape around the external circumference of the screw needle or valve needle (220), in particular for limiting the adjustment of the fuel flow through a carburetor (400; 400′), in such a way that inadvertently pushing the limiter cap onto the screw needle thus prematurely blocking said screw needle, already at the time when the (basic) carburetor adjustment takes place, is safely prevented, it is proposed that the limiting cap (300; 300′) is attached to each of the set screws (200) in particular in a way so as to be self-attaching, and/or in particular such that the limiter caps (300; 300′) engage each other with locking action, and/or without any further auxiliary means or without any further supplementary part.

Claims14

Dependent claims

A limiter cap (300;

300′) for limiting the adjustability of at least two set screws or valves (200), which are arranged side by side, with each set screw or valve (200) comprising at least one retaining nose or stop leg (240), which in the transition area between the screw head (210) and the screw needle or valve needle (220) extend in a ring shape around the outer circumference of the screw needle or valve needle (220), for limiting the adjustment of the fuel flow through a carburetor (400;
400′), wherein said limiter cap (300;
300′)
can be attached to any of the set screws (200);
comprises at least one adjustment prevention device (330), comprising at least one end stop (332, 334);
can be attached to the set screw (200) so that the limiter cap (300;
300′) surrounds at least a region of the set screw (200) essentially so as to be positive-locking;
and
in a first installation position, in which the set screw (200) can be rotated relative to the limiter cap (300;
300′), can be attached in a captive way to the set screw (200);
and
in a second installation position can be locked in a captive way to the set screw (200) by way of at least one locking means (250), by way of at least one serration profile, by way of at least one knurl;
characterised in that
attachment of the limiter cap (300;
300′) on each of the set screws (200) takes place
in a self-attaching manner and/or
such that the limiter caps (300;
300′) snap into each other, and/or
without any further auxiliaries or supplementary parts;
and
that each of the limiter caps (300;
300′) comprises at least one guiding nose (352) and at least one connection groove (324) such that
in the first installation position, the guiding nose (352) of one limiter cap (300 or 300′) engages the connection groove (324) of the other limiter cap (300′ or 300) which is attached to the adjacent set screw (200);
and
in the second installation position the guiding nose (352) jumps back below the stop leg or the retaining nose (240).

22 more elements

A method for adjusting the fuel flow through a carburetor (400;

400′) wherein
(i) the carburetor (400;
400′) is provided with at least two rotatable set screws or valves (200), arranged side by side, for preadjusting the fuel throughflow by rotating the screw needle (220), which projects from the carburetor (400;
400′), of the respective set screw (200) or of the valve shaft of the respective valve which valve shaft projects from the carburetor (400;
400′);
(ii) in a first installation phase for preadjusting the carburetor (400;
400′), the respective set screw (200) is rotated relative to at least one limiter cap (300;
300′) which encloses at least a region of the respective set screw (200) in an essentially positive manner and in a captive manner on each of the set screws (200);
in a self-attaching manner and/or
in such a way that the limiter caps (300;
300′) snap into each other;
and/or
without any further auxiliary or supplementary part so as to adjust the fuel flow to a specified desired value, wherein
the respective limiter cap (300;
300′) is clipped to or locked to the respective set screw (200), and
the screw head (210) of the respective set screw (200) projects from the end region (360) facing away from the screw needle (220) or valve needle of the respective limiter cap (300;
300′) so that the respective set screw (200) in the first installation phase cannot be locked to the respective limiter cap (300;
300′), and
(iii) in a second installation phase the respective limiting cap (300;
300′) can be locked in a captive way to the respective set screw (200) by way of at least one locking means (250), by way of at least one serration profile, by way of at least one knurl, so that any adjustment or readjustment option is only possible within the framework of an adjustment angle which is determined by an adjustment prevention device (330), of which there is at least one, associated with the limiter cap (300;
300′), comprising at least one end stop (332, 334).

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/050,018Filed 2 Feb 2005
Priority: DE 20 2004 001 774 U5 Feb 2004
Published: US 2005/0173816 A111 Aug 2005
Granted: 29 Aug 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02M 3/08
Idling devices for carburettors: other details of idling devices
F02M 19/04
Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 -…
F02M 2003/105
Fuel metering pins; Nozzles: needle adjustment limiter caps
Y10S 261/38
Gas and liquid contact apparatus: needle valves