Loading patent…
AssigneeWalbro Corporation
InventorsGary U. Gliniecki, Paul S. Learman, George M. Pattullo, David L. Thomas
Estimating the term…
A carburetor having throttle valve co-rotatable with a small diameter throttle shaft having a free end protruding from an exterior side surface of the associated carburetor body. A throttle lever detent arm is co-rotatable on and with the throttle shaft free end adjacent each body surface. Interengageable detents on the detent arm and body surface are spaced radially away from throttle shaft the rotational axis by a distance, for example, of about three times the shaft diameter. The arm and body detents are releasibly engageable with one another for thereby yieldable holding the detent arm and hence the throttle shaft and associated throttle valve in any one of a plurality of selected angular settings. Hence, the angular tolerance variation on the set positions of the throttle valve blade as controlled by the detents is now, for example, approximately three times more precise so that the tolerance limits for such positions are now rendered three time tighter than otherwise would be possible when utilizing the prior art. Hence manufacturing tolerances do not need to be tightened up in order to achieve the exemplary three-fold improvement in operational tolerances of the carburetor throttle control detent mechanism. The invention thus provides a low cost throttle control detent mechanism that enables fine increment, positive stops at predetermined valve blade settings, such as the W.O.T. (wide-open throttle), idle and closed valve positions.
In a carburetor having a body with an air-fuel mixture passageway and a rotatable throttle valve in said passageway mounted for rotation on and with a throttle shaft journaled for rotation on a rotational axis in said body and having a free end protruding exteriorly of said body from an exterior side surface of said body, said throttle shaft having a given diameter of relatively small dimension, a throttle lever detent arm mounted on said throttle shaft free end for rotation therewith in an angular travel path about said rotational axis adjacent said exterior side surface of said body, first detent means on said body side surface located in fixed position thereon adjacent the travel path of said detent arm and spaced radially away from said axis a predetermined distance greater than the diameter of said throttle shaft, said detent arm having second detent means thereon likewise generally spaced said predetermined distance radially away from said rotational axis and constructed and oriented so as to be releasibly engageable with said first detent means for thereby yieldable holding said arm and hence said throttle shaft and associated throttle valve in any one of a plurality of selected angular settings.
Dependencies are inferred from the claim text.