Automatic shut-off switch

Claim 2

In a snowmobile having an elongated body and an underlying endless track for moving same, pivotal skis at the forward end for steering the snowmobile, an internal combustion engine for driving said track, a carburetor for controlling delivery of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical discharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said snowmobile adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising a throttle control arm, a first electrical contact on said arm and second electrical contact means, said first and second contacts being position and arranged so that said first and second contacts are electrically completed when said arm is in a position corresponding to engine idle speed and are electrically opened for all other engine speeds at least one of said first and second contacts being electrically insulated from its support. b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which ordinarily corresponds to an engine driving speed.

Claim 3

A snowmobile in accordance with claim 1 wherein said second switch comprises a hand control lever pivotally mounted to a handlebar, an opening in said control lever, a cable sheath, a control cable attached to said throttle and slidably extending through said sheath and having an end slidably extending through said opening, a cable end being fixedly attached thereto, and defining a third electrical contact, spring means biasing said cable end away from said opening, fourth contact means insulatedly secured to said control lever adjacent the cable end side of said opening to meet said third electrical contact when said spring bias is overcome by movement of said manual control member toward said cable end.

Claim 4

In a snowmobile having an elongated body and an underlying endless track for moving same, pivotal skis at the forward end for steering the snowmobile, an internal combustion engine for driving said track, a carburetor for controlling delivering of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical discharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said snowmobile adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising a throttle control arm, a first electrical contact on said arm, an idle screw mounting means positioned adjacent said first electrical contact, an idle screw supported by said mounting means, one end of said screw forming a second electrical contact, said screw being positioned and arranged so that said first and second contacts are electrically coMpleted when said arm is in a position corresponding to engine idle speed and are electrically opened for all other engine speeds, at least one of said first and second contacts being electrically insulated from its support, b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which ordinarily corresponds to an engine driving speed.

Claim 5

In a snowmobile having an elongated body and an underlying endless track for moving same, pivotal skis at the forward end for steering the snowmobile, an internal combustion engine for driving said track, a carburetor for controlling delivering of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical discharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said snowmobile adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising a throttle control arm, a first electrical contact on said arm, an idle screw mounting means positioned adjacent said first electrical contact, an idle screw supported by said mounting means, one end of said screw forming a second electrical contact, said screw being positioned and arranged so that said first and second contacts are electrically coMpleted when said arm is in a position corresponding to engine idle speed and are electrically opened for all other engine speeds, at least one of said first and second contacts being electrically insulated from its support, b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which ordinarily corresponds to an engine driving speed.

Claim 6

A snowmobile in accordance with claim 3 wherein said remote throttle control and said second switch are mounted on a steering handlebar.

Claim 7

A snowmobile in accordance with claim 3 wherein said remote throttle control member is operatively linked to said throttle by means of a cable slidably passing through a flexible sheath fixedly mounted at the end adjacent said throttle.

Claim 8

A snowmobile in accordance with claim 5 wherein said remote throttle control member has an opening therein through which said control cable end slidably extends beyond the side of said control member remote from said throttle, said cable end having a fixedly mounted stop member thereon, a third electrical contact on said stop, spring means biasing said stop away from said opening, a fourth electrical contact operably secured to said control member adjacent the stop side of said opening to meet said third contact when said spring bias is overcome by movement of said control member toward said stop, at least one of said third and fourth contacts being electrically insulated from its support.

Claim 9

A snowmobile in accordance with claim 6 wherein a stop member is fixedly secured to said cable intermediate said lever and said cable sheath and positioned to limit cable movement toward said throttle when said lever is in a position corresponding to engine idle speed.

Claim 10

A snowmobile in accordance with claim 5 wherein said remote throttle control member has an opening therein through which said control cable end slidably extends beyond the side of said control member opening remote from said throttle, said cable end having a fixedly mounted stop member thereon, said stop member defining a third electrical contact, spring means biasing said stop away from said opening, a fourth electrical contact operably secured to and electrically insulated from said control member adjacent the stop side of said opening to meet said third contact when said spring bias is overcome by movement of said manual control member toward said stop, said third and fourth contacts defining said second switch.

Claim 11

In a snowmobile having an elongated body and an underlying endless track for moving same, pivotal skis at the forward end for steering the snowmobile, an internal combustion engine for driving said track, a carburetor for controlling delivery of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical discharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said snowmobile adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising throttle control arm a portion of which defines a first electrical contact, an insulated idle screw mounting means positioned adjacent said first electrical contact, an idle screw extending through said support member with one end of said screw defining a second electrical contact, said screw being positioned and arranged so that said first and second conTacts are in electrical contact when said arm is in the position corresponding to engine idle speed and are electrically opened for all other engine speeds, b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which ordinarily corresponds to an engine driving speed.

Claim 12

In a snowmobile having an elongated body and an underlying endless track for moving same, pivotal skis at the forward end for steering the snowmobile, an internal combustion engine for driving said track, a carburetor for controlling delivery of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical discharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said snowmobile adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising throttle control arm a portion of which defines a first electrical contact, an insulated idle screw mounting means positioned adjacent said first electrical contact, an idle screw extending through said support member with one end of said screw defining a second electrical contact, said screw being positioned and arranged so that said first and second conTacts are in electrical contact when said arm is in the position corresponding to engine idle speed and are electrically opened for all other engine speeds, b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which ordinarily corresponds to an engine driving speed.

Claim 13

In a self-propelled vehicle where power to propel the vehicle is supplied by an internal combustion engine, a carburetor for controlling delivery of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical disharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said vehicle adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising a throttle control arm, a first electrical contact on said arm, an idle screw mounting means positioned adjacent said first electrical contact, a idle screw supported by said mounting means, one end of said screw forming a second electrical contact, said screw being positioned and arranged so that said first and second contacts are electrically completed when said arm is in a position corresponding to engine idle speed and are electrically opened for all other engine speeds, at leat one of said first and second contacts being electrically insulated from its support, b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which oridinarily corresponds to an engine driving speed.

Claim 14

In a self-propelled vehicle where power to propel the vehicle is supplied by an internal combustion engine, a carburetor for controlling delivery of fuel to said engine including a throttle for controlling carburetor operation, spring means biasing said throttle in an engine idle condition, a manually operated throttle control remote from said throttle and operatively connected to said throttle by linkage means, and a closed ignition circuit for producing an electrical disharge across a spark plug in said engine, the improvement comprising including within said ignition circuit: a. first electrical switch means mounted to said vehicle adjacent said carburetor and in operative engagement with said carburetor throttle, said first switch being in a closed position when said carburetor throttle is in a position corresponding to an engine idling condition and in an open condition for all other engine speeds, said first switch comprising a throttle control arm, a first electrical contact on said arm, an idle screw mounting means positioned adjacent said first electrical contact, a idle screw supported by said mounting means, one end of said screw forming a second electrical contact, said screw being positioned and arranged so that said first and second contacts are electrically completed when said arm is in a position corresponding to engine idle speed and are electrically opened for all other engine speeds, at leat one of said first and second contacts being electrically insulated from its support, b. second switch means electrically parallel to said first switch and in operative engagement with said remote throttle control means, said second switch means being in a closed position when said throttle control means is in a position which oridinarily corresponds to an engine driving speed.