| 摘要 |
A saw ( 10 ) facilitates cutting of roofing and includes a frame ( 12 ) that is mobile on a work surface. A locking mechanism ( 40 ) locks the frame ( 12 ) into a transport position. Actuating a release lever ( 60 ) allows the frame ( 12 ) to be adjusted into a working position. A shaft ( 14 ) rotatably mounted by first, second and third bearings ( 74, 75, 76 ) has saw blades ( 16, 18 ) and a pulley ( 77 ) for connection with a drive belt ( 80 ). The drive belt ( 80 ) passes through a hole ( 79 ) in the frame ( 12 ) to connect to a drive ( 81 ) to rotate the shaft ( 14 ) and the saw blades ( 16, 18 ). The third bearing ( 76 ) is mounted to a bearing support ( 85 ). The frame ( 12 ) has a gap ( 84 ) communicating the hole ( 79 ) with an exterior edge ( 78 ) of the frame ( 12 ) proximate the third bearing ( 76 ), with the bearing support ( 85 ) removably and replaceably mounted to the frame ( 12 ) and spanning the gap ( 84 ). When the bearing support ( 85 ) is removed from the frame ( 12 ), the third bearing ( 76 ) is void of attachments to the frame ( 12 ), and the drive belt ( 80 ) may be passed over the access end ( 70 ) of the shaft ( 14 ) and over the third bearing ( 76 ) and into the hole ( 79 ) to access the pulley ( 77 ) while the first, second and third bearings ( 74, 75, 76 ) remain in position on the shaft ( 14 ) to expedite drive belt replacement.
|
