Closure fasteners – Adjustable backset
Reexamination Certificate
2000-08-02
2002-01-01
Dayoan, B. (Department: 3627)
Closure fasteners
Adjustable backset
C292S001000, C292S337000, C292S169130, C292S169140, C292S169160, C292SDIG006, C292S348000, C292S336300
Reexamination Certificate
active
06334635
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a latch bolt mechanism of a tubular lock that is adjustable in backset by using an extension casing.
2. Description of the Related Art
Many devices have been proposed to allow adjustment in backset of a lockset such that the lockset can be used with either one of two kinds of backset configuration in the structure of traditional latch bolt mechanism—namely, a 2⅜ inch type and a 2¾ inch type. An example of backset-adjustable latch bolt mechanisms is disclosed in U.S. Pat. No. 4,711,477 issued to Fann et al. on Dec. 8, 1987. The present invention is intended to provide a different design in this regard.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a latch bolt mechanism of a tubular lock that is adjustable in backset in response to the user's need by using an extension casing.
A latch bolt mechanism of a tubular lock in accordance with the present invention allows adjustment in backset by using an extension casing. The latch bolt mechanism has a latch bolt housing having a latch bolt mounted therein, the latch bolt being movable beyond a face plate or retracted into the face plate. Two plates are connected together and mounted to an inner end of the latch bolt. The plates includes aligned two first positioning holes, aligned second positioning hole, and aligned openings. An actuating plate is mounted between the plates and includes an end operably connected to the latch bolt. The other end of the actuating plate includes two teeth each having a block formed thereon. The blocks are pressed against by a follower plate that also includes two teeth. When either tooth of the actuating plate or the follower plate is pressed against by a spindle of the lockset, the latch bolt is retracted. An extension casing is mounted around the plates and movable toward or away from the latch bolt housing. The extension casing includes a first hole and a second hole through which the spindle of the lockset is selectively extended.
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: 4427224 (1984-01-01), Bergen
patent: 4711477 (1987-12-01), Fann et al.
patent: 4746154 (1988-05-01), Fang
patent: 4850626 (1989-07-01), Gallego
patent: 4890871 (1990-01-01), Lin
patent: 4927199 (1990-05-01), Wu et al.
patent: 5020837 (1991-06-01), Lin
patent: 6030008 (2000-02-01), Chang
patent: 6257630 (2001-07-01), Huang
patent: 6293597 (2001-09-01), Huang
Bacon & Thomas
Dayoan B.
Lugo Carlos
Taiwan Fu Hsing Industrial Co., Ltd.
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