Cutting arrangement for a motor-driven chain saw

A cutting arrangement for a motor-drive chain saw having a drive shaft, the cutting arrangement comprising:

• a preassembled component to be fastened to the chain saw;
• at least one attachment bolt for connecting said preassembled component to said chain saw;
• and,
• the preassembled component including:
• a saw chain;
• a sprocket drive wheel for connecting said saw chain to said drive shaft;
• a guide bar having an outer periphery and having a guide groove formed thereon for guiding said saw chain along said outer periphery;
• said guide bar having a forward end and having nose means at said forward end for guiding the saw chain as said saw chain moves around said guide bar;
• said guide bar having a rearward end facing away from said forward nose means and having at least one slot formed therein for receiving said attachment bolt when said preassembled component is mounted on said chain saw;
• said sprocket drive wheel being disposed adjacent said rearward end and near to said one slot;
• a tensioning device for holding said guide bar, said sprocket drive wheel and saw chain together under tension to define said preassembled component;
• and,
• said tensioning device being mounted in said guide bar so as to constitute a part thereof;
• said tensioning device including a pressure piece supported in said guide bar so as to be displaceable therein in a direction toward said sprocket drive wheel;
• said tensioning device further including a spring for resiliently biasing said pressure piece toward said sprocket drive wheel;
• said pressure piece being a slide and said tensioning device further including guide means for slidably guiding said slide between said side plates;
• and,
• said guide bar defining a longitudinal axis and including two side plates and a center plate disposed between said two side plates;
• said guide means including a cutout formed in said center plate;
• said cutout extending along said longitudinal axis and having an open end opening toward said sprocket drive wheel;
• and, said slide being slideably mounted in said cutout so as to be movable toward and away from said sprocket drive wheel.

A cutting arrangement for a motor-driven chain saw having a drive shaft, the cutting arrangement comprising:

• a preassembled component to be fastened to the chain saw;
• at least one attachment bolt for connecting said preassembled component to said chain saw;
• and,
• the preassembled component including:
• a saw chain;
• a sprocket drive wheel for connecting said saw chain to said drive shaft;
• a guide bar having a outer periphery and having a guide groove formed therein for guiding said saw chain along said outer periphery;
• said guide bar having a forward end and having nose means at said forward end for guiding the saw chain as said saw chain moves around said guide bar;
• said guide bar having a rearward end facing away from said forward nose means and having at least one slot formed therein for receiving said attachment bolt when said preassembled component is mounted on said chain saw;
• said sprocket drive wheel being disposed adjacent said rearward end and near to said one slot;
• a tensioning device for holding said guide bar, said sprocket dive wheel and saw chain together under tension to define said preassembled component;
• and,
• said tensioning device being mounted in said guide bar so as to constitute a part thereof;
• said tensioning device including a pressure piece supported in said guide bar so as to displaceable therein in a direction toward said sprocket drive wheel;
• said tensioning device further including a spring for resiliently biasing said pressure piece toward said sprocket drive wheel;
• said pressure piece being a slide and said tensioning device further including guide means for slideably guiding said slide between said side plates;
• and,
• said chain saw having a housing on which the preassembled component is mounted;
• said sprocket drive wheel having an end face facing away from said housing;
• and, said stop means including a cap provided on said end face;
• and, a housing cover partially covering said guide bar;
• and, said cap being so dimensioned that said cap is spaced at a slight distance from said cover after said preassembled unit is mounted on said chain saw.

A cutting arrangement for a motor-driven chain saw having a drive shaft, the cutting arrangement comprising:

• a preassembled component to be fastened to the chain saw;
• at least one attachment bolt for connecting said preassembled component to said chain saw;
• and,
• the preassembled component including:
• a saw chain;
• a sprocket drive wheel for connecting said saw chain to said drive shaft when said preassembled component is mounted on said chain saw;
• a guide bar having an outer periphery and having a guide groove formed thereon for guiding said saw chain along said outer periphery;
• said guide bar having a forward end and having nose means at said forward end for guiding the saw chain as said saw chain moves around said guide bar;
• said guide bar having a rearward end facing away from said forward nose means and having at least one slot formed therein for receiving said attachment bolt when said preassembled component is mounted on said chain saw;
• said sprocket drive wheel being disposed adjacent said rearward end and near to said one slot;
• tensioning means for holding said guide bar, said sprocket drive wheel and saw chain together under tension to define said preassembled component without said preassembled component being mounted on said chain saw;
• and,
• said tensioning means being mounted in said guide bar so as to constitute a part thereof.