Closure fasteners – Bolts – Reversible
Reexamination Certificate
2000-12-20
2002-09-03
Knight, Anthony (Department: 3676)
Closure fasteners
Bolts
Reversible
C070S462000
Reexamination Certificate
active
06443506
ABSTRACT:
BACKGROUND OF THE INVENTION
The prior application (U.S. Ser. No. 09/667,640) as shown in
FIG. 1
disclosed a door lock set including: a housing
1
; an upper cam
2
operatively retracting an upper latch
3
; a first linking rod
4
having an upper pin
41
slidably engaging in a left arcuate slot portion
22
of the arcuate slot
21
formed in the upper cam and a lower pin
42
slidably engaging with a slot
621
in a left lug
62
of a lower cam
6
having a spindle
61
rotatably mounted in a holding plate
60
as cushioned by a coiled spring
64
; a second linking rod
5
having an upper pin
51
slidably engaging in a right arcuate slot portion
23
of the arcuate slot
21
and a lower pin
52
slidably engaging with a slot
631
in a right lug
63
of the lower cam
6
; with the lower cam
6
operatively retracting a lower latch
7
.
The prior application is especially suitable for use in a lever handle lock set having a small rotating angle when rotating either spindle (20 or 61) of the cam (2 or 6), not suitable for a door-knob type lock set, which will be explained hereinafter.
As shown in
FIG. 2
, a conventional door-knob type lock set includes: a door knob K which is rotated either clockwise R
1
or counterclockwise R
2
to allow either shoulder projection S
1
or S
2
formed on the knob spindle S to rearwardly push either lug L
1
or L
2
formed on a rear end portion of the latch bolt B for retracting the latch bolt B for opening a door. The door knob K (namely the spindle S) should be rotated in a wide or large angle in order to obtain an enough stroke for retracting the latch bolt B for opening the door.
Inferentially, if the prior application (U.S. Ser. No. 09/667,640 as illustrated in
FIG. 1
) is adapted for use as a door-knob type lock set as shown in
FIG. 2
, it will be described as follows:
When the knob K is rotated in an angle larger than a biasing angle A
1
as shown in dotted line of
FIG. 1
, the linking rod
4
will be obstructed by the spindle
20
of the upper cam
2
. Since a door knob K will require a larger or wider rotating angle A
2
such as shown in phantom line of
FIG. 1
, the prior application is therefore not suitable for use in a door-knob type lock set because the two linking rods
4
,
5
will be easily obstructed or retarded by the spindle
20
of the cam
2
.
Therefore, the present inventor has found this drawback of the prior application and invented the present continuation-in-part for a larger rotating angle for a door-knob type lock set.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a door lock set including: a housing fixed on a door; an upper cam rotatably mounted on an upper portion of the housing and operatively retracting an upper latch by a thumbturn knob; a lower cam rotatably mounted on a lower portion of the housing and operatively retracting a lower latch by rotating a door knob secured to a spindle of the lower cam; a linking device having an upper linking plate pivotally secured to the upper cam, a first linking rod and a second linking rod respectively upwardly pivotally secured to the upper linking plate and respectively downwardly pivotally secured to the lower cam, whereby the spindle can be rotated in a large angle for rotating the lower cam for retracting the lower latch and for synchronously biasing the upper cam for retracting the upper latch for opening the door, thereby being suitable for a door-knob type lock set; and the linking device may be optionally disposed on a right side portion of the upper cam for retracting the latch as provided on a right side of the door; or the linking device may be optionally disposed on a left side portion of the upper cam for retracting the latch as provided on a left side of the door.
REFERENCES:
patent: 3390558 (1968-07-01), Tornoe et al.
patent: 4809526 (1989-03-01), Shen
patent: 4864835 (1989-09-01), Wartian
patent: 4995248 (1991-02-01), Liu
patent: 5077992 (1992-01-01), Su
patent: 3627634 (1988-02-01), None
patent: 2493896 (1982-05-01), None
Knight Anthony
Walsh John B.
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