| 摘要 |
A mortice latch has a casing (1), a latch bolt lath (34) mounted in the casing, a latch bolt head (22) mounted on the latch bolt lath (34), a follower (36) arranged to engage the latch bolt lath (34) and designed to receive the spindle of a handle or knob, a spring (43) arranged to act on the follower (36) and a forend (29). One end of the spring (43) is engageable with a retainer (44) which is arranged to extend into the casing (1) to be releasably engaged within the casing and which is accessible from outside the casing through an aperture in the front side wall (2) of the casing (1). The arrangement is such that, after removal of the forend (29), the retainer (44) can be engaged through the aperture and withdrawn from the casing through the aperture, the spring (43) being withdrawn with the retainer (44) so that the spring can be changed without opening the casing (1) or without removing the casing from a door in which the said casing has been fitted. |
