Closure fasteners – Bolts – Sliding
Reexamination Certificate
1999-06-04
2001-02-13
Estremsky, Gary W. (Department: 3627)
Closure fasteners
Bolts
Sliding
C292S337000, C292SDIG006
Reexamination Certificate
active
06186562
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a latch bolt assembly of a lock.
2. Description of the Related Art
Taiwan Utility Model Publication No. 82243, entitled “LATCH BOLT MECHANISM IMPROVEMENT OF A TUBULAR LOCK” and issued on Nov. 1, 1986, discloses a latch bolt mechanism that includes an outer casing assembly, a latch bolt assembly, and an arcuate transmission crank. The latch bolt assembly includes a latch bolt, an unlatching plate engaged with the latch bolt, and a latch bolt driving member. It is, however, found that engagement between the latch bolt and the unlatching plate is unreliable such that the latch bolt might be bent when subjected to a relatively large external force. As a result, the latch bolt assembly will be damaged and thus malfunction.
The present invention is intended to provide a latch bolt assembly to solve this problem.
SUMMARY OF THE INVENTION
In accordance with a first aspect of the invention, a latch bolt assembly of a lock comprises:
a casing;
a transmission device mounted in the casing; and
a latch bolt device including a latch bolt, a transmission member having a first end with a hook thereon and a second end actuatable by the transmission device, and a reinforcing plate, the latch bolt including a cavity for receiving the first end of the transmission member, the latch bolt further including a side opening for engaging with the hook of the transmission member to thereby couple the latch bolt to the transmission member to move therewith, the reinforcing plate being inserted into the cavity to fill a spacing between the transmission member and the latch bolt, thereby securely retaining the first end of the transmission member in the cavity of the latch bolt.
In accordance with a second aspect of the invention, a latch bolt assembly of a lock comprises:
a casing;
a transmission device mounted in the casing; and
a latch bolt device including a latch bolt, a transmission member having a first end engaged with the latch bolt to move therewith and a second end actuatable by the transmission device, wherein the transmission device further includes a safety means mounted juxtaposed to the latch bolt, wherein the safety means is biased inward to a position to prevent retraction of the latch bolt when a door to which the lock is mounted is in a closed position.
In a preferred embodiment of the invention, the safety means includes a safety rod mounted juxtaposed to the latch bolt, a burglarproof plate having a first end securely mounted in the casing and a second end with an arcuate portion, an unlatching plate having a first end connected to the safety rod to move therewith and a second end operably connected to the arcuate portion of the burglarproof plate, and an elastic member mounted between the safety rod and the burglarproof plate for biasing the safety rod out of the door and for biasing the second end of the burglarproof plate out of a retraction path of the latch bolt when the door is in an opened position. The second end of the burglarproof plate is biased to a position to prevent retraction of the latch bolt when the door is in the closed position.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4687239 (1987-08-01), Lin
patent: 4718706 (1988-01-01), Fang
patent: 4850626 (1989-07-01), Gallego
patent: 5257837 (1993-11-01), Bishop
patent: 82243 (1986-11-01), None
Bacon & Thomas PLLC
Estremsky Gary W.
Fu Hsing Industrial Co., Ltd
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