Battery operated chain saw unit and method of constructing the same

A method of constructing a chain saw unit for a chain saw of the type including a chain bar and a cutting chain guided in movement by the chain bar, the method comprising the steps of;

• obtaining:
• a) an endo-skeletal sub-frame assembly defining a plurality of mount locations;
• b) a plurality of operating components including at least:
• i) a battery operated motor;
• and ii) a drive transmission assembly through which a cutting chain can be driven by the battery operated motor;
• and c) an outer housing assembly,
• wherein the endo-skeletal sub-frame assembly has a top, a bottom, a front, a rear, and laterally spaced sides;
• directing one of the operating components from a pre-assembly position into an operative position at one of the mount locations,
• wherein one of the sides of the endo-skeletal sub-frame assembly has an opening through which the operatively positioned one component is exposed to be accessed from the one side of the endo-skeletal sub-frame assembly;
• placing additional ones of the operating components in operative positions, each at one of the mount locations, to define a main operating unit to which the chain bar and cutting chain can be operatively assembled so that the cutting chain can be driven by the battery operated motor,
• the main operating unit having an exposed surface area, a top, a bottom, and spaces sides;
• and
• after directing the one of the operating components into its operative position, placing at least a part of the outer housing assembly in an operative position with respect to the endo-skeletal sub-frame assembly wherein the at least part of the outer housing assembly overlies part of the exposed surface area of the main operating unit and blocks access to the operatively positioned one component through the opening from the one side of the endo-skeletal sub-frame assembly.