| 摘要 |
A latch bolt with a front releasing face (6 Fig 3) for engaging a keep and a rear latch face 5 which includes a distal portion 5B that is inclined to provide a taper towards a distal end 11 of the latch bolt. The rear latch face 5 has a ridged portion 14 that extends outwardly towards the distal end 11 of the bolt partway between the top and bottom of the bolt and projects outward from the rear latch face 5. The ridge may be of curved cross section. The latch bolt may have a root portion 12 and the ridge may extend along part of the root. The front face of the bolt may be concave. The root may form a mounting portion with a rearwardly projecting spigot 13 for alignment with the latch bolt casing. The ridge 14 allows smooth retraction of the latch bolt when the bolt is returning towards the keep. |
