| CPC B27B 17/14 (2013.01) [B27B 17/02 (2013.01)] | 7 Claims |
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1. A chainsaw comprising:
a chainsaw body;
a guide bar extending in a front-rear direction, with a rear of the guide bar coupled to the chainsaw body; and
a chain tension mechanism for adjusting tension of a saw chain wound around an outer circumference of the guide bar, wherein
the chain tension mechanism includes:
on an outer surface of the chainsaw body,
an adjustment dial made of resin and rotatable about an axis in a right-left direction; and
inside the chainsaw body,
a rotation transmission member made of metal and rotatable about an axis in the right-left direction,
a feed screw member made of metal and rotatable about an axis in the front-rear direction, and
a slide member coupled to the guide bar,
the slide member is screwed to the feed screw member to move in the front-rear direction, with rotation of the feed screw member,
a first gear formed on an outer circumference of the adjustment dial is meshed with a second gear formed on an outer circumference of the rotation transmission member, and
a first bevel gear formed on the rotation transmission member is meshed with a second bevel gear formed on the feed screw member,
the adjustment dial is formed, at a portion thereof closer to a distal end thereof, with a held portion,
the adjustment dial is formed, at a portion thereof closer to a base end thereof, with the first gear, and
a ratio of a maximum outer diameter of the held portion to a maximum outer diameter of the second gear is in a range of 4:1 to 5:1.
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