Invention Grant
- Patent Title: Chain saw
- Patent Title (中): 链锯
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Application No.: US12245868Application Date: 2008-10-06
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Publication No.: US08794196B2Publication Date: 2014-08-05
- Inventor: Koichi Shimokawa , Kiminobu Sato
- Applicant: Koichi Shimokawa , Kiminobu Sato
- Applicant Address: JP Kawagoe-shi, Saitama
- Assignee: Husqvarna Zenoah Co., Ltd.
- Current Assignee: Husqvarna Zenoah Co., Ltd.
- Current Assignee Address: JP Kawagoe-shi, Saitama
- Agency: Holtz Holtz Goodman & Chick PC
- Main IPC: F01P5/02
- IPC: F01P5/02 ; B27B17/00

Abstract:
A cooling fan includes: a hub; a plurality of cooling vanes provided along an outer circumference of the hub; and an annular connector for connecting the cooling vanes. The hub is provided with a through hole that axially penetrates the hub. A first cover on a case for covering an outward side of the cooling fan is provided with a first outer-air intake. A second cover for partitioning between the cooling fan and a crankcase and for covering an inward side of the cooling fan is provided with a second outer-air intake. With this arrangement, even when one outer-air intake (for instance, the first outer-air intake) adjacent to where the cooling vanes are provided is clogged by a large amount of dust generated during operations, the cooling vanes can breathe from the non-clogged other outer-air intake (for instance, the second outer-air intake) through the through hole, thereby restraining reduction in air flow.
Public/Granted literature
- US20100083511A1 CHAIN SAW Public/Granted day:2010-04-08
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