| 摘要 |
<p>PURPOSE:To turn the arm smoothly, to make the sliding part unnecessary and to make an operation failure, water leakage and lock due to the attachment of steel none by providing a thin-walled bend to the sealing part of duplex structure made of flexible material. CONSTITUTION:The thin-walled bends 14, 15 formed in the sealing materials 10, 11 expand and contract depending on the rotation of arm, these are made the center of turning arm. Also flanges 16, 17 which unite sealing and mounting parts are formed in the radial end of thin-walled parts. Moreover, a backup sheet 18 that contacts with the sealing material and prevents its deformation is provided to the outside of the sealing material.</p> |
