Portable sharpener

A method for in situ sharpening of the teeth (102) of a chain (101) of a chainsaw, comprising the steps of:

• providing a chainsaw and a portable sharpener (1) for chainsaws, wherein said portable sharpener (1) comprises (a) at least one sharpening tool (2) configured to sharpen the teeth (102) of the chain (101) of the chainsaw;
• and (b) a coupling device (3) supporting the at least one sharpening tool (2) and configured to be reversibly constrained to a chain guide bar (100) of the chainsaw;
• said coupling device (3) comprising (a) a support structure (4) having a first plate (4a) adapted to be arranged parallel to a main extension plane of the bar (100) and a second plate (4b) configured to abut against the bar (100) in such a way as to be at least partly interposed between said bar (100) and the chain (101), said first and second plate (4b) being arranged substantially in an L-configuration;
• and (b) one or more attachment members (5) applied to said first plate (4a) and configured to constrain said support structure (4) to the bar (100) of the chainsaw;
• applying the sharpener (1) to the chainsaw;
• sharpening the teeth (102) by activating the at least one sharpening tool (2);
• characterised in that said step of applying the sharpener (1) to the chainsaw comprises the steps of:
• abutting the first plate (4a) against the bar (100), realising a reciprocal coupling by means of said attachment means;
• arranging the second plate (4b) in abutment against the bar (100) in such a way as to interpose the second plate (4b) at least partly between said bar (100) and the chain (101).