Abstract: A rod-less cylinder comprises a cylinder having an inner surface, an outer surface, a slit elongating in the longitudinal direction in the outer surface, and being formed by a pair of opposing side surfaces, a side recess on the inner surface, which has a width larger than that of the slit, which extends over two sides of the slit and in the direction of the width of the same, and which have first surfaces intersection the side surfaces of the slit and second surfaces intersecting the first surfaces. The rod-less cylinder further comprises a piston which is able to reciprocate in the cylinder and a sealing member which is detachably fitted in the side recess, and which is able to close the slit. The sealing member has a pair of holding ribs for holding the sealing member in the side recess by its engagement with the second surfaces, and a pair of sealing lips for closing the cylinder and the side groove.

Abstract: A rod-less cylinder comprises a cylinder having an inner surface, an outer surface, a slit elongating in the longitudinal direction in the outer surface, and being formed by a pair of opposing side surfaces, a side recess on the inner surface, which has a width larger than that of the slit, which extends over two sides of the slit and in the direction of the width of the same, and which have first surfaces intersection the side surfaces of the slit and second surfaces intersecting the first surfaces. The rod-less cylinder further comprises a piston which is able to reciprocate in the cylinder and a sealing member which is detachably fitted in the side recess, and which is able to close the slit. The sealing member has a pair of holding ribs for holding the sealing member in the side recess by its engagement with the second surfaces, and a pair of sealing lips for closing the cylinder and the side groove.