Chainsaw
AssigneeYamabiko Corporation
InventorHiroyuki Miyaki
Life of this patent
Estimating the term…
Abstract
A chainsaw includes a chain tension mechanism. The chain tension mechanism includes: an adjustment dial made of resin and rotatable about an axis in a right-left direction; 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 a front-rear direction; and a slide member coupled to a guide bar. The slide member is screwed to the feed screw member. A first gear of the adjustment dial is meshed with a second gear of the rotation transmission member, and a first bevel gear of the rotation transmission member is meshed with a second bevel gear of the feed screw member.
Claims7
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.
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 provided, on an outer circumferential surface thereof, with a rib extending in a circumferential direction, and
- the adjustment dial is formed, on the outer circumference thereof, with the first gear at a portion thereof closer to a base end thereof than the rib.
Dependencies are inferred from the claim text.