Tubular lock with a backset adjustable by a follower plate
AssigneeTaiwan Fu Hsing Industrial Co., Ltd.
InventorChao Ming Huang
Life of this patent
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Abstract
A tubular lock includes a latch bolt cylinder engaged with a casing consisting of two casing parts. An actuating plate is mounted between the casing parts and includes two separate teeth and two protrusions. A follower plate is in close contact with the follower plate and to which the protrusions bear against. The follower plate also includes two separate teeth. A spindle of the tubular lock bears against two teeth of the follower plate, thereby allowing the actuating plate to retract the latch bolt indirectly. Alternatively, the actuating plate can be directly actuated to retract the latch bolt.
Claims6
A tubular lock with an adjustable backset, comprising:
- a latch bolt cylinder with a latch bolt that is retractable into or extended beyond a faceplate of the tubular lock, the latch bolt cylinder having an inner end;
- two casing parts assembled together to the inner end of the latch bolt, each of said casing parts forming two first positioning through holes, and an opening, said opening having a recess formed along a periphery defining a positioning recess;
- an actuating plate including a first end operably connected to the latch bolt and a second end forming two first teeth and two protrusions, said actuating plate being disposed between said casing parts;
- and
- a follower plate slidably mounted between the casing parts and operably connected with the actuating plate to urge extension and retraction of said latch bolt, the follower plate being movable between a shorter backset position and a longer backset position, the follower plate including a first end forming two second teeth and a first arcuate recess, the follower plate further including a second end forming a second arcuate recess.
Dependencies are inferred from the claim text.