Combustion engine pull-cord start system

A pull-cord start system for a combustion engine comprising:

• an engine start assist device;
• a housing;
• a recoil pulley disposed rotatably in the housing and connected to a crankshaft of the engine;
• a releasable coupling disposed in-part in the housing and constructed and arranged to interact with the recoil pulley;
• a linkage operably connecting the coupling with the start assist device;
• a cord having a first and last winding wound about the recoil pulley, a first end adjacent the first winding for gripping by an operator, and a second end adjacent the last winding and engaged to the pulley;
• wherein unwinding of the first winding by a manual pull of the cord by the operator causes the recoil pulley to rotate and the releasable coupling to move relative to the housing which actuates the start assist device;
• a circumferential surface of the recoil pulley;
• a groove of the recoil pulley opened radially outward for receiving the cord;
• a channel defined radially between the housing and the circumferential surface;
• and
• wherein the releasable coupling is disposed in part in the channel.

A pull-cord system for a combustion engine comprising:

• an engine start assist device;
• a housing;
• a recoil pulley disposed rotatably in the housing and connected to a crankshaft of the engine;
• a releasable coupling disposed in-part in the housing and constructed and arranged to interact with the recoil pulley;
• a linkage operably connecting the coupling with the start assist device;
• a cord having a first and last winding wound about the recoil pulley, a first end adjacent the first winding for gripping by an operator, and a second end adjacent the last winding and engaged to the pulley;
• wherein unwinding of the first winding by a manual pull of the cord by the operator causes the recoil pulley to rotate and the releasable coupling to move relative to the housing which actuates the start assist device;
• a circumferential surface of the recoil pulley;
• a groove of the recoil pulley opened radially outward for receiving the cord;
• a channel defined radially between the housing and the circumferential surface;
• wherein the releasable coupling is disposed in part in the channel;
• the recoil pulley having a recoiled state, an unwound state and a central axis;
• a shuttle of the releasable coupling disposed slidably in the channel;
• wherein the linkage is connected to the shuttle;
• a roller of the coupling engaged rotatably to the shuttle within the channel, the roller having a rotational axis disposed parallel to the central axis and disposed radially outward of the recoil pulley;
• wherein the first winding of the cord is wound over the roller and the recoil pulley and the last winding is wound only about the recoil pulley when the recoil pulley is in the recoiled state;
• and
• wherein the first winding is withdrawn from the housing and the last winding is generally wound over the roller when the recoil pulley is in the unwound state.

A pull-cord start system for a combustion engine comprising:

• a start assist device having an actuated position and a normal operating yieldably biased position;
• a housing;
• a recoil pulley disposed rotatably in the housing and connected by a one way coupling to a crankshaft of the engine, the recoil pulley having a central axis, a yieldably biased recoiled state and an unwound state;
• a shuttle in operable relationship with the recoil pulley, the shuttle having an actuation position;
• a linkage operably connected to the shuttle and the start assist device;
• a cord having a first and last winding wound about the recoil pulley, a first end adjacent the first winding for gripping by an operator, and a second end adjacent the last winding and engaged to the pulley;
• a roller engaged rotatably to the shuttle about a rotational axis disposed parallel to the central axis of the recoil pulley;
• the first winding of the cord is wound over the roller and the recoil pulley and generally encircles both the central axis and the rotational axis and the last winding is wound about only the recoil pulley so that the rotational axis is located radially outside of the last winding when the recoil pulley is in the recoiled state;
• and
• the last winding of the cord is substantially wound over the roller and the recoil pulley and the first winding is disposed outside of the housing when the recoil pulley is in the unwound state.

A pull-cord start system for a combustion engine comprising:

• an engine start assist device;
• a housing;
• a recoil pulley disposed rotatably in the housing about a central axis and connected to a crankshaft of the engine;
• a releasable shuttle disposed in-part in the housing and constructed and arranged to interact with the recoil pulley while moving circumferentially with respect to the central axis;
• a linkage operably connecting the shuttle with the start assist device;
• a cord having a first and last winding wound about the recoil pulley, a first end adjacent the first winding for gripping by an operator, and a second end adjacent the last winding and engaged to the pulley;
• and
• wherein unwinding of the first winding by a manual pull of the cord by the operator causes the recoil pulley to rotate and the releasable shuttle to move relative to the housing which actuates the start assist device.

A pull cord start system for a combustion engine comprising:

• a carburetor having:
• <a body,
• a fuel-and-air mixing passage through the body,
• a rotatable choke valve in the fuel-and-air mixing passage and biased yieldably in an open position, and
• a rotatable throttle valve in the fuel-and-air mixing passage downstream of the choke valve and biased yieldably in a closing direction;
• a pull-cord assembly having:
• a housing,
• a recoil pulley disposed rotatably in the housing and connected to a crankshaft of the engine,
• a releasable coupling disposed at least in-part in the housing and constructed and arranged to interact with the recoil pulley, and
• a cord having a first and last winding wound about the recoil pulley, a first end adjacent the first winding for gripping by an operator, and a second end adjacent the last winding and engaged to the pulley so that pulling of the cord causes the releasable coupling to move toward an actuated state;
• and
• a linkage operably connecting the releasable coupling of the pull-cord assembly with the choke valve of the carburetor so that when the releasable coupling is moving toward the actuated state the linkage moves the choke valve toward a closed position from the biased open position, and release of the cord de-actuates the releasable coupling causing the choke valve to move partially toward the biased closed position.