Note: Descriptions are shown in the official language in which they were submitted.
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~ FIELD OF THE INVENTION
The present invention relates to door locks generally
and more particularly to deadbolt type door locks.
BAC~GROUND OF THE INVENTION
Various types of deadbolt locking mechanisms are known
in the art. Examples of the state of the art appear in the
following U.S. Patents: 4,512,597; 4,183,565; 4,111,477;
2,383,576; 1,748,599 and 1,541,093, and the prior art references
mentioned therein.
U.S. Patent 4,512,597 describes a ball structure for
locking the end of a deadbolt into a strike in the door frame, so
as to resist forced removal of the deadbolt from the strike.
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SUMMARY OF THE INVENTION
The present invention seeks to provide an improved and
simplified deadbolt locking device having an auxiliary end
locking mechanism.
There is thus provided in accordance with a preferred
embodiment of the present invention a deadbolt locking device
comprising a locking bolt which is translatable along a
longitudinal axis into and out of locking engagement with a
receiving strike; a bolt driving assembly for selectably
translating the locking bolt along the longitudinal axis; a
rotatable bolt locking element disposed at an extreme end of the
locking bolt and being rotatable with respect to the locking bolt
to a locked position such that translation of the locking bolt
out of locking engagement with the receiving strike is prevented
thereby, and apparatus for automatically rotating the rotatable
bolt locking element during at least a portion of the translation
of locking bolt along the longitudinal axis.
In accordance with a preferred embodiment of the
present invention, the rotatable bolt locking element comprises a
member which is rotatable about the longitudinal axis.
Further in accordance with a preferred embodiment of
the present invention, the rotatable bolt locking element is
pivotably mounted onto an end of the locking bolt.
Additionally in accordance wlth a preferred embodiment
of the present invention apparatus for automatically rotating
comprises a pin attached to the rotatable bolt locking element
and a cam engaging the pin and causing rotation thereof upon
translation of the locking bolt along part of its travel path.
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_ In accordance with one embodiment of the invention, the
bolt driving assembly includes a key-operated cylinder.
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BRIEF DESCRIPTION OF THE DRAWINGS
-
The present invention will be understood and
appreciated more fully from the following detailed description,
taken in conjunction with the drawings in which:
Fig. 1 is a sectional illustration of a deadbolt
locking device, constructed and operative in accordance with a
preferred embodiment of the present invention, in an unlocked
operative orientation;
Fig. 2 is a pictorial illustration of the device of
Fig. 1 in a locked operative orientation;
Figs. 3A and 3B are sectional illustrations, taken
respectively along lines 3A - 3A and 3B - 3B in respective Figs.
1 and 2; and
Figs. 4A, 4B and 4C are illustrations of a rotatable
bolt locking element, taken in a direction IV in Fig. 1, in
respective unlocked, partially locked and fully locked operative
orientations.
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
-
Reference is now made to Figs. 1 - 4C, which illustrate
a deadbolt locking device constructed and operative in accordance
with a preferred embodiment of the present invention.
The deadbolt locking device preferably comprises a
chassis 10 comprising a pair of chassis plates 12 which are
bolted together as by bolts 14 and 16 and associated spacers 18.
Rotatably mounted on chassis 10, between plates 12, is a rotary-
to-linear displacement assembly 20. Assembly 20 includes a socket
22 for receiving a driving portion of a lock cylinder (not shown)
or alternatively a knob. Fixedly attached to socket 22 for
rotation together therewith is a displacement finger 24 which is
operative to rotate from an unlocked orientation as shown in
Figs. 1 and 3A to a locked orientation as shown in Figs. 2 and
3Bo
Displacement finger 24 is operative to providing sliding
axial displacement of a follower element 26, which is formed with
a socket 28 for receiving finger 24 and which is slidable along a
longitudinal axis 30. Element 26 is fixedly attached to a locking
bolt 32 which is displaced thereby along axis 30.
In accordance with a preferred embodiment of the
present invention, locking bolt 32 is formed with a central bore
34, preferably disposed along axis 30. Extending at least
partially through bore 34 is a shaft 36 to which is mounted by
means of a mounti~g member 37 a transversely extending pin 38.
Mounted onto shaft 36 by any suitable conventional technique is a
rotatable bolt locking element 40. Rotatable bolt locking element
typically has the same outer dimensions and cross sectional
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~onfiguration as locking bolt 32 and is rotatably disposed
adjacent an end 42 thereof, preferably for rotation about the
longitudinal axis 30.
Transversely extending pin 38 engages a cam slot 50
which is defined in a generally cylindrical housing 52. Housing
52 surrounds locking bolt 32, when the locking bolt is in a non-
locking operative orientation. Cam 50 comprises an axial portion
54 followed by an arcuate portion 56.
It is appreciated that as locking bolt 32 is- extended
in a direction 60 along axis 30, pin 38 travels along cam slot
50, initially along axial portion 54 and thereafter along arcuate
portion 56. As long as pin 38 travels along axial portion 54, the
rotatable bolt locking element 40 is not rotated and the mutual
orientations of the locking bolt 32 and the locking element are
as shown in Fig. 4A.
Once the pin 38 begins to travel along the arcuate
portion 56, which is preferably after the end 42 of the bolt has
passed into a strike 62, normally mounted onto a door frame (not
shown), the rotatable bolt locking element 40 begins to rotate
relative to the locking bolt 32, as illustrated in Fig. 4B.
When locking bolt 32 is fully extended, as shown in
Figs. 2 and 3B, the pin 38 is located at the end of the arcuate
por,tion 56 and the rotatable bolt locking element 40, as seen in
Fig. 4C, is rotated by 90 degrees with respect to its original
orientation, shown in Fig. 4A.
In this orientation, the rotatable bolt locking element
40 is positioned so that it prevents the locking bolt 32 to which
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it is attached from being pulled out of strike 62.
A door mounted strike 58 is attached by conventional
means to housing 52 and typically includes a pair of parallel
apertured plates 64 and 66. In accordance with one embodiment of
the invention, the outer plate 64 may be modular and decorative
such that its color and finish may be matched to that of strike
62. Alternatively, a thin cover plate (not shown) may be placed
over outer plate 60 for decorative purposes.
It will be appreciated by persons skilled in the art
-that the present invention is not limited to what has been
partlcularly shown and described hereinabove, but rather includes
variations and modifications thereto within the spirit of the
invention. Accordingly, the present invention is defined only by
the claims which follow:
