Door lock latch

Details Door lock latch Door lock latch

2000-01-20

2002-06-11

Knight, Anthony (Department: 3626)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Carpet fasteners

Combined fasteners and stretchers

C016S197000, C016S337000

Reexamination Certificate

active

06401297

ABSTRACT:

BACKGROUND OF THE INVENTION
The upper edge of a flat O-shaped hole
231
for the latch bar
24
at the center of base fixing plate
23
is provided with a notch
232
so as to install an upper cover
22
; a nut cylinder
211
is provided at a position nearby the rear end of base body
210
so as to lock the upper cover
22
; or, alternatively, a pair of protuberances are provided correspondingly at the front end of cover body
220
of the upper cover
22
so as to be installed at the notch
232
of latch fixing plate
23
at the front end of base
21
; a tap hole
222
is provided correspondingly at a position nearby the rear end of cover body
220
so as to dispose a screw
27
in the nut cylinder
211
on the base body
210
for locking each other.
Since the base body
210
of base
21
of long and short latches
2
a
,
2
b
of conventional door lock is integrally molded together with the latch fixing plate
23
and no “retractable mechanism” is designed to adjust the length of latch, some separate molds have to be made so as to make the latches and upper covers with different length and to install a latch opening/closing mechanism
25
and latch bar
24
between the base
21
and the upper cover
22
(as shown in FIG.
4
and
5
), and after a decorative panel
26
in riveted in front of the latch fixing plate
23
, the long latch
2
a
and the short latch
2
b
are respectively made for the consumers' optional purchase and installation.
Because the long and short latches
2
a
,
2
b
with specific length have to be made for the conventional door lock latch and no retractable mechanism to adjust the length of long and short latches is provided, frequently the consumers buy the wrong door locks which cannot be installed, and for the manufacturers, they have to produce both long and short latches
2
a
,
2
b
with different length and increase a doubled stock in their warehouse.
For the convenience of consumers' optional purchases without troubles of installation, and also for the convenience of manufacturers' production to decrease one half of their warehouse stock, the present inventor particularly invented “an improved door lock latch” through his research and development.
SUMMARY OF THE INVENTION
The primary object of the present invention is to offer an improved door lock latch which is characterized in convenient installation and use, without identifying long or short one while optional purchase, and even if in case of undesirable length while installation, all to do is to loosen the screw to “pull long” for elongation or “press in” for contraction and then to lock it then the short latch becomes long one or the long latch becomes short one.
Another object of the present invention is to offer an improved door lock latch which is characterized in the convenience of manufacturers' production without separately making both long and short latches, and only one length is made enough to adjust the length of these latches.


REFERENCES:
patent: 4750766 (1988-06-01), Shen
patent: 5149151 (1992-09-01), Shen
patent: 5169184 (1992-12-01), Bishop
patent: 5257837 (1993-11-01), Bishop
patent: 5743573 (1998-04-01), Huang
patent: 5927770 (1999-07-01), Huang

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