Back to results
US 12,752,408 B2Granted
Work machine
AssigneeKoki Holdings Co., Ltd.
InventorsToshinori Yasutomi, Takashi Kawamata
Life of this patent
Estimating the term…
Abstract
A nailer includes a case part with hollow shape and a piston part. The case part includes a cylinder. The piston part defines a pressure chamber inside the case part and strikes a fastener by moving to a lower side due to a pressure of a gas in the pressure chamber. The piston part includes: a base member including a sidewall; an X-ring attached to the base member to be interposed between the sidewall and the cylinder; and an O-ring interposed between the sidewall and the cylinder and attached at a position different from the X-ring in an up-down direction. The X-ring includes a first base part and a lip part standing from the first base part and contacting the cylinder. The O-ring includes a second base part and does not include a lip part standing from the second base part.
Claims14
A work machine comprising:
- a case part with hollow shape comprising a cylinder, the cylinder being in a tubular shape extending in a first direction and comprising an inner wall;
- and
- a piston part capable of moving in the first direction inside the cylinder, the piston part cooperating with the case part to define a pressure chamber inside the case part, and striking a fastener by moving to a first side in the first direction due to a pressure of a gas inside the pressure chamber, wherein
- the piston part comprises:
- a base member comprising a sidewall facing the inner wall of the cylinder;
- a first seal member attached to the base member to be interposed between the sidewall and the inner wall, wherein the first seal member is disposed between a first space at the first side of the first seal member in the first direction and a second space at a second side, opposite to the first side, of the first seal member in the first direction so as to seal between the first space and the second space;
- a second seal member attached to the base member to be interposed between the sidewall and the inner wall, and arranged at a position different from the first seal member in the first direction, wherein the second seal member is disposed between a third space at the first side of the second seal member in the first direction, and a fourth space at the second side of the second seal member in the first direction so as to seal between the third space and the fourth space;
- and
- a slide ring attached to the base member for being interposed between the sidewall and the inner wall and arranged at a position different from the first seal member and the second seal member in the first direction,
- wherein, in a cross-sectional view at a cut plane parallel to the first direction, the first seal member comprises a first base part and a lip part standing from the first base part and contacting the cylinder, and
- in the cross-sectional view, the second seal member comprises a second base part and does not comprise a lip part standing from the second base part,
- wherein the base member is configured to move a slide part including the first seal member, the second seal member and the slide ring along the inner wall while the base member moves inside the cylinder.
9 more elements
A work machine comprising:
- a case part with hollow shape comprising a cylinder, the cylinder being in a tubular shape extending in a first direction and comprising an inner wall;
- and
- a piston part capable of moving in the first direction inside the cylinder, the piston part cooperating with the case part to define a pressure chamber inside the case part, and striking a fastener by moving to a first side in the first direction due to a pressure of a gas inside the pressure chamber, wherein
- the piston part comprises:
- a base member comprising a sidewall facing the inner wall of the cylinder;
- a first seal member attached to the base member to be interposed between the sidewall and the inner wall, wherein the first seal member is disposed between a first space at the first side of the first seal member in the first direction, and a second space at a second side, opposite to the first side, of the first seal member in the first direction so as to seal between the first space and the second space;
- a second seal member attached to the base member to be interposed between the sidewall and the inner wall, and arranged on the first side in the first direction of the first seal member, wherein the second seal member is disposed between a third space at the first side of the second seal member in the first direction, and a forth space at the second side of the second seal member in the first direction so as to seal between the third space and the fourth space;
- and
- a slide ring attached to the base member for being interposed between the sidewall and the inner wall and arranged at a position different from the first seal member and the second seal member in the first direction,
- wherein an abutment force of the first seal member against the cylinder is greater than an abutment force of the second seal member against the cylinder, and
- the base member is configured to move a slide part including the first seal member, the second seal member and the slide ring along the inner wall while the base member moves inside the cylinder.
8 more elements
Dependencies are inferred from the claim text.