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A chain saw automatic tensioner preferably includes a base plate, a chain bar, a tensioning cylinder, a sliding block and a pusher block. The base plate includes a sliding slot that is sized to slidably receive the sliding block. The chain bar includes a substantially half oval shape that is sized t

A chain saw automatic tensioner preferably includes a base plate, a chain bar, a tensioning cylinder, a sliding block and a pusher block. The base plate includes a sliding slot that is sized to slidably receive the sliding block. The chain bar includes a substantially half oval shape that is sized to retain a cutting chain. An end of the chain bar is retained between a top of the sliding block and a bottom of the pusher block. The tensioning cylinder is mounted to the base plate opposite the sliding slot. Hydraulic oil in the tensioning cylinder forces a cylinder rod and the pusher block secured to the chain bar away from a chain sprocket and thus tensioning the cutting chain.

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I claim: 1. A method of automatically tensioning a cutting chain of a chain saw, comprising the steps of: providing a base plate; engaging slidably one end of a chain bar with said base plate; attaching an actuation device to one side of said base plate, said actuation device having an actuation en

I claim: 1. A method of automatically tensioning a cutting chain of a chain saw, comprising the steps of: providing a base plate; engaging slidably one end of a chain bar with said base plate; attaching an actuation device to one side of said base plate, said actuation device having an actuation end, said actuation end being in contact with said one end of said chain bar; engaging slidably a sliding block with said base plate opposite said actuation device, retaining said one end of said chain bar between said sliding block and a pusher block; retaining a chain sprocket above said one side of said base plate, said chain sprocket and said chain bar retaining a cutting chain; and positioning said actuation end over said chain sprocket. 2. The method of automatically tensioning a cutting chain of a chain saw of claim 1, further comprising the step of: forming a key slot in said one end of said chain bar, extending a key projection from said sliding block, said key slot being sized to receive said key projection. 3. The method of automatically tensioning a cutting chain of a chain saw of claim 1, further comprising the step of: retaining said one end of said chain bar between said sliding block and said pusher block with at least one fastener. 4. The method of automatically tensioning a cutting chain of a chain saw of claim 1, further comprising the step of: providing a hydraulic cylinder for said actuation device and a cylinder rod for said actuation end. 5. The method of automatically tensioning a cutting chain of a chain saw of claim 1, further comprising the step of: forming a clearance slot in an end and bottom of said actuation device to provide clearance for said chain sprocket. 6. The method of automatically tensioning a cutting chain of a chain saw of claim 1, further comprising the step of: rotating said chain sprocket with a motor. 7. A method of automatically tensioning a cutting chain of a chain saw, comprising the steps of: providing a base plate with a sliding slot; providing a sliding block that is sized to be slidably received by said sliding slot; attaching one end of a chain bar to said sliding block; retaining said one end of said chain bar between said sliding block and a pusher block; attaching an actuation device to one side of said base plate opposite said sliding slot, said actuation device having an actuation end, said actuation end being in contact with said one end of said chain bar; retaining a chain sprocket above said one side of said base plate, said chain sprocket and said chain bar retaining a cutting chain; and positioning said actuation end over said chain sprocket. 8. The method of automatically tensioning a cutting chain of a chain saw of claim 7, further comprising the step of: forming a key slot in said one end of said chain bar, extending a key projection from said sliding block, said key slot being sized to receive said key projection. 9. The method of automatically tensioning a cutting chain of a chain saw of claim 7, further comprising the step of: retaining said one end of said chain bar between said sliding block and said pusher block with at least one fastener. 10. The method of automatically tensioning a cutting chain of a chain saw of claim 7, further comprising the step of: providing a hydraulic cylinder for said actuation device and a cylinder rod for said actuation end. 11. The method of automatically tensioning a cutting chain of a chain saw of claim 7, further comprising the step of: forming a clearance slot in an end and a bottom of said actuation device to provide clearance for said chain sprocket. 12. The method of automatically tensioning a cutting chain of a chain saw of claim 7, further comprising the step of: rotating said chain sprocket with a motor. 13. A method of automatically tensioning a cutting chain of a chain saw, comprising the steps of: providing a base plate, forming a sliding slot in said base plate; providing a sliding block that is sized to be slidably received by said sliding slot; attaching one end of a chain bar to said sliding block; attaching a pusher block to a top of said chain bar at said one end thereof; retaining said one end of said chain bar between said sliding block and said pusher block with at least one fastener; attaching a hydraulic cylinder to one side of said base plate opposite said sliding slot, said hydraulic cylinder having a cylinder rod, said cylinder rod end being engaged with said pusher block; retaining a chain sprocket above said one side of said base plate, said chain sprocket and said chain bar retaining a cutting chain; and positioning a portion of said hydraulic cylinder and said cylinder rod over said chain sprocket. 14. The method of automatically tensioning a cutting chain of a chain saw of claim 13, further comprising the step of: forming a key slot in said one end of said chain bar, extending a key projection from said sliding block, said key slot being sized to receive said key projection. 15. The method of automatically tensioning a cutting chain of a chain saw of claim 13, further comprising the step of: forming a clearance slot in an end and a bottom of said actuation device to provide clearance for said chain sprocket. 16. The method of automatically tensioning a cutting chain of a chain saw of claim 13, further comprising the step of: rotating said chain sprocket with a motor.