Patent Application
20200362809
The present invention relates to a starting assist mechanism for a small combustion engine.
A recoil start engine, which can also be referred to as a manual start, a pull start or a rewind start, is a method of starting a small internal combustion engine. Such an engine is usually associated with small machines, such as lawn mowers, chainsaws, weed eaters, small outboard motors, portable generators, as well as small vehicles such as small go-karts, minibikes, snowmobiles and small ATVs.
Some legacy motors actually use a pull starter that has a slotted reel directly connected to the crankshaft, and a rope is inserted into the slot, and it is wound around the reel and is then pulled to start the engine. Once the end of the pull is reached, the rope comes free from the reel, leaving the now disconnected rope in the person's hand. If the engine fails to start on the first pull, the operator has to re-wind the rope onto the reel by hand.
A typical recoil start engine has a starter mechanism made up of a rope, with a grip at the end, a molded rope reel and a spring. The rope is coiled about the reel which is held under tension by the spring. This reel assembly is in contact with one end of the crankshaft through a ratcheting mechanism, such as a freewheeling clutch. When the rope's grip is pulled, the rope uncoils turning the reel, tensioning the spring, and engaging the clutch, which turns the crankshaft. The spinning of the crankshaft allows the engine to start, hopefully before the end of the pull stroke. After the end of the pull is reached, whether or not the engine has started, the spring operated reel retracts the rope, in order to prepare the starter mechanism for another attempt to start and disengages the clutch hence the term “re-coil starter”. Once the rope reaches the end of its travel and/or the engine starts, the freewheel mechanism disengages the reel so that it is not driven by the engine.
Some small engines have an easy start feature which serves to hold the valves of the engine open by way of a cam while the rope is being pulled, avoiding the need to overcome the compression of the cylinders. The cam is deactivated at the end of the “pull” to activate the valves so that the engine can fire and run by itself. Even this easy start feature can be difficult for some people to accomplish if they have limited movement or strength of their arms, or if they suffer from joint issues.
What is needed in the art is a mechanism and a method of starting a small engine without the need to pull a rope starting system.
Exemplary embodiments of the present invention provide for the installation of a kit into a small internal combustion engine so that a drill can be used to start the engine.
In accordance with an aspect of the present invention, there is provided a small combustion engine mechanism including an engine, a driven device powered by the engine. The engine having a ratcheting reel mechanism, a recoil starter housing, a shaft member coupled to the reel mechanism, and a bearing member coupled to the recoil starter housing. The shaft member being supported by the bearing member. The engine also has a tool engaging member coupled to the shaft member, the tool engaging member being accessible to a tool driver.
In accordance with another aspect of the present invention, there is provided a small combustion engine starting device. The engine having a ratcheting reel mechanism, and a recoil starter housing. The starting device having a shaft member coupled to the reel mechanism, and a bearing member coupled to the recoil starter housing. The shaft member being supported by the bearing member. The engine also has a tool engaging member coupled to the shaft member, the tool engaging member being accessible to a tool driver.
In accordance with another aspect of the present invention, there is provided a small combustion engine starting device kit. The kit having a shaft member couplable to the reel mechanism of the engine, and a bearing member couplable to the recoil starter housing of the engine. The shaft member being supported by the bearing member. The kit also has a tool engaging member coupled to the shaft member, the tool engaging member being accessible to a tool driver.
For the purpose of illustration, there are shown in the drawings certain embodiments of the present invention. It should be understood, however, that the invention is not limited to the precise arrangements, dimensions, and instruments shown. Like numerals indicate like elements throughout the drawings. In the drawings:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate one embodiment of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
Referring now to the drawings, and more particularly to
Shaft member 18 includes shafts 24 and 40 that are coupled to a plate 26. One end of shaft 24 is perpendicularly connected to the surface of plate 26 relative to longitudinal axis A, and one end of shaft 40 is coupled to an opposite side of plate 26 coaxially with axis A. Shafts 24 and 40 may be integral with each other and plate 26 may have a hole therein into which integral shaft 24/40 is inserted. Shaft 40 can interact with a bearing of reel mechanism 14 to thereby provide axial alignment of engine starting device 12 with the legacy parts of chainsaw 10. Bearing member 20 has a bearing 28 coupled to a plate 30 allowing shaft 24 to be inserted into bearing 28 which is supported thereby. Tool engaging member 22 is coupled to an end of shaft 24 to provide an interface with a tool held by driver D. Fasteners 32 are used to respectively connect shaft member 18 to reel mechanism 14, and bearing member 20 to starter housing 16. Chainsaw 10 has a chain 34 that is driven by engine 36. While chainsaw 10 is used as an example, it is to be understood that engine 36 is representative of any small internal combustion engine 36, which is used to drive a driven device 34.
While bearing member 20 is illustrated as being installed on an outer surface of housing 16, it is also contemplated that bearing member 20 could be installed on an inner surface of housing 16. Further, while tool engaging member 22 is illustrated as being a male feature that interacts with a female oriented tool held by drill D, it is also contemplated that tool engaging member 22 can be oriented as a female device and can even be recessed into bearing 28, which would be engaged with a male tool in driver/drill D.
Now, additionally referring to
Advantageously, the present invention uses the ratcheting reel mechanism 14 of the saw, which serves to disengage the rotating crankshaft of engine 36 once engine 36 starts. The reel mechanism 14 includes the annular groove 38 where a rope would go, had chainsaw 10 not been converted, hence using as many parts from the prior art saw as is possible. Further, the use of driver/drill D provides flexibility in the starting of engine 36 and does not burden the weight of chainsaw 10 during operation of chainsaw 10.
Now, additionally referring to
It is also contemplated that the present invention may be added to a rope starting system to thereby allow the starting of the engine with either the pulling of the rope starting system or by use of the small combustion engine starting device 12. This allows the user to use either method to start the small engine. For example, using the small combustion engine starting device 12 may be advantageous when the engine is cold, to initially get the engine running; then later should the engine stall or be shut off, using the rope starter to restart the engine, which should be easier than when the engine was cold.
While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
