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US 4,773,371 AGranted
Override speed control having governed idle
AssigneeTecumseh Products Company
InventorKenneth J. Stenz
Life of this patent
Estimating the term…
Abstract
An override speed control mechanism for an internal combustion engine. The override speed control mechanism comprises an engine control lever connected to a governor control arm by means of an over-center linkage mechanism so that further rotation of the engine control lever beyond the high speed range into the choke range acts to reduce tension on the governor spring. The mechanism also includes a governed idle whereby the position of the governor control arm can be adjusted in the idle position to set the tension on the governor spring.
Claims17
An override speed control mechanism for an internal combustion engine comprising:
- a carburetor having a throttle valve and a choke valve,
- governor means mounted on said engine and driven thereby and responsive to engine speed, said governor means including a control arm operatively connected to said throttle valve for adjusting said throttle valve in accordance with engine speed,
- a moveable engine control lever manually operable to select engine speed, said lever being positionable sequentially through a low speed range, a high speed range and a choke range,
- a moveable governor adjust arm yieldably connected to said governor control arm by a resilient linkage means,
- a choke control arm connected to said choke valve,
- means interposed between said engine control lever and said choke control arm for moving said choke arm into choke position when said engine control lever is positioned in the choke range,
- control link means connected between said engine control lever and said governor adjust arm for moving said governor adjust arm to change the tension of said resilient linkage means as said engine control lever is moved to thereby change the setting of said throttle valve,
- said control link means including tension reducing means for causing said governor adjust arm to one of reduce or maintain equal the tension of said resilient linkage means as said engine control lever is moved from the high speed range into the choke range, and
- idle adjustment means associated with said governor adjust arm and operable when said engine control lever is in the low speed range for limiting the movement of said governor adjust arm in a direction that reduces tension of said resilient linkage means.
6 more elements
An override speed control mechanism for an internal combustion engine comprising:
- a carburetor having a throttle valve and a choke valve,
- governor means mounted on said engine and driven thereby and responsive to engine speed, said governor means including a control arm operatively connected to said throttle valve for adjusting said throttle valve in accordance with engine speed,
- a moveable engine control lever manually operable to select engine speed, said lever being positionable sequentially through a low speed range, a high speed range and a choke range,
- a moveable governor adjust arm yieldably connected to said governor control arm by a spring,
- a choke control arm connected to said choke valve,
- means interposed between said engine control lever and said choke control arm for moving said choke arm into choke position when said engine control lever is positioned in the choke range,
- control link means connected between said engine control lever and said governor adjust arm for moving said governor adjust arm to increase the tension of said spring as said engine control lever is moved through the high speed range toward the choke range,
- said control link including over-center linkage means for moving the governor adjust arm in a direction to reduce spring tension as the engine control lever is moved from the high speed range into the choke range, and
- idle adjustment means associated with said governor adjust arm and operable when said engine control lever is in the low speed range for limiting the movement of said governor adjust arm in a direction that reduces tension of said spring,
- said control link means including lost motion means for isolating the movement of said engine control lever from said governor adjust arm in the low speed range.
7 more elements
Dependencies are inferred from the claim text.