| 摘要 |
PURPOSE:To prevent a reservoir body from fluctuation of the internal pressure while preventing intrusion of dust by constituting a covered body from inner and outer covers and divided into an atmosheric chamber and a enclosed chamber communicating to a reservoir between both covers to afford communication between both chambers through a labyrinth path. CONSTITUTION:A covered body 10 is constituted from inner and outer covers 11, 12. The inner cover 11 is fitted in the outer cover 12 while being fitted in an outer tube 1B of a reservoir body 1 and the outer cover 12 is screwed onto the outer tube 1B. On a support 16 of a cover 14 attached to the outer cover 12 is mounted a first push rod 17 the lower end of which extends through a hole in the inner cover 11. A second push rod 19 is provided to extend through a hole 20 in a strainer 6 so that the upper end of said rod 19 abuts against the lower end of the first push rod 17. When the push rod 17 is depressed, a float 5 is depressed through the push rod 19. Also, the inner cover 11 is provided with an annular projecting partition wall 22 to define an atompsheric chamber A and an enclosed chamber B between the inner and outer covers 11, 12. The enclosed chamber B communicates to the inside of reservoir while the chambers A, B communicate to each other through a labyrinth path. |
