Tubular lock with a backset adjustable by a follower plate

Details Tubular lock with a backset adjustable by a follower plate Tubular lock with a backset adjustable by a follower plate

1999-10-25

2001-09-25

Estremsky, Gary (Department: 3627)

Closure fasteners

Adjustable backset

C292S337000

Reexamination Certificate

active

06293597

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tubular lock with a backset that is adjustable by means of moving a follower plate.
2. Description of the Related Art
U.S. Pat. No. 4,711,477 to Fann et al. issued on Dec. 8, 1987 discloses a duplex latch bolt mechanism that can be adjusted to provide two different backsets. The present invention is intended to provide a different design in this regard.
SUMMARY OF THE INVENTION
A tubular lock in accordance with the present invention includes a follower plate movably mounted between two casing parts. In a shorter backset status, the spindle of the tubular lock bears against two teeth of the follower plate, which, in turn, bears against two protrusions of an actuating plate mounted between the casing parts such that the latch bolt can be indirectly retracted. In a longer backset status, the spindle directly bears against two teeth of the actuating plate such that the latch bolt can be directly retracted.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 4711477 (1987-12-01), Fann et al.
patent: 4750766 (1988-06-01), Shen
patent: 5149151 (1992-09-01), Shen
patent: 5490695 (1996-02-01), Shiue
patent: 5743573 (1998-04-01), Huang

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