| 摘要 |
To provide for effective sealing of a movable piston in a cylinder formed with a longitudinal slit, a motion transfer element (9, 10, 11, 12) is coupled to the piston (5) extending through the slit (3) and shaped in form of a yoke (11) extending over and around the outer surfaces of the cylinder tube (1), to retain the portions of the tube separated by the slit. The slit is sealed in the region between sealed ends (4) of the cylinder and the piston heads (6, 7) of the piston by a pair of separable and re-engageable plastic strips (18, 27), the inner strip (18) being formed with a projecting headed ridge (26) fitting in a snap-in groove (30) defined by two legs (29) extending from the outer strip. Upon movement of the piston (5), a wedge-shaped separating element (36) separates the interengaged ridge-groove combination ahead of the movement, and a top pressing element (37) coupled to the yoke (11) re-seals the headed ridge (26) in the groove (30) at the trailing side to form sealed cylinder chambers (19, 20) and retain the cylinder chambers in sealed condition upon movement of the piston, and with it the yoke and the separating wedge. The strips may be made of plastic to permit resilient deflection and engagement of the ridge (26) in the groove (30). |
