Note: Descriptions are shown in the official language in which they were submitted.
~L065~313
The present invention relates to lock mechanisms and, more
particularly, to a high security lock for use wi~h a door panel. :
The present invention provides a high security lock for use
with a door panel comprising a shell having a surface adapted to engage
said panel and having a front wall, means defining a substantially circular
hole through said front wall, an interior cylindrical counterbore in
said front wall larger than said hole and concentric thereto, a lock body
in said shell and having a planar end face and a circular-cylindrical :-
~- bore therein concentric to said hole, a circular-cylindrical plug rotatable
in said bore, a flange on one end of said plug abutting said end face and
smaller than said hole to leave a space therebetween, means defining
a keyway in said plug, said keyway having an edge opening radially through :
said flange to leave an edge notch therein, a circular guard plate larger
than said hole rotatably mounted in said counterbore, said guard plate ~ :
. having a key-receiving opening therethrough and overlying said plug, a -.
tab on said guard plate near the periphery thereof and disposed in said ~.
edge notch at the periphery of said flange, means mounting said lock body
in said shell, and means separate from said body retaining said guard
plate rotatably in said counterbore.
In the drawings:
Figure 1 is a view in horizontal cross-section through a door
panel on which is mounted a high security deadbolt lock pursuant to the : :
invention, portions being broken away;
FiguTe 2 is a cross-section, the plane of which is
~ . . '''' '.
':
,, ' ~'
~. . : ' : :. ;.
i3~3 :
indicated by the line 2-2 of Figure l;
Figu~e 3 is an exterior elevation of the guard platë
portion of the lock mechanism shown in Figure l;
Figure ~ is an interior elevation of the guard plate
portion of the mechanism of the invention;
Figure 5 is a cross-section on the line 5-5 of ~Figure 3,
part of the structure being broken away to reduce the size
of the figure;
Figure 6 is a cross-section, the plane of section
being indicated by the line 6~6 of Figure 2;
Figure 7 is aninterior elevational view of a modifica-
tion of the interior construction;
Figure 8 is a cross-section, the planes of whic'n are
indicated by the line 8-8 of Figure 7; and
Figure 9 is an exploded view in isometric projection
showing various parts of the arrangement in their relative
but spaced positions.
A normal environment for installation of the high
security deadbolt lock is in connection with a wall 6
~O (Figure 1) in which is disposed a door frame including a
door stop 7. Mounted on the door frame is a door panel 8
swinging between open and closed positions about the axis
of hinges 9. The door panel is between an arbitrarily
ind~icated exterior side 11 of the wall and an interior
side 12 thereof. On the door panel is a bolt mechanism 13
~, .
. ~_
~, ~q
~.
~C~6S63~
adapted to operate between a retracted position in which
the panel 8 is free to swing and a projected position in
which a bolt 14 (Figure 9) is projected to interengage with
a strike box 16 in the door frame or wall 6. .
- 5 The door panel is provided with a through bore 17 in
which a high security deadbolt lock 18 is mounted. In the
present instance the lock mechanism is controllable by an :
exterior key 19 and by an interior key 21. The installations
on opposite sides of the panel are shown as substantially
duplicated, although the interlor installation is some-
times varied, as will hereinafter appear. :~
The bolt mechanism 13 includes a bolt frame 23 (Figures ;
2`and 9) having a pair of holes 24 therein and through
which pass elongated posts 26 extending from an interior :
- 15 plate 27 having a generally conical periphery surrounding
a face 28 adapted to abut against the interior surface of
the door panel 8. ~ ~
A;.somewhat similar but deeper conical exterior sh~ll 31 ; -
is formed with an abutting face 32 to contact the exterior
surface of the door panelO If desired, the shell is
provided with a permanent skin or surface cup 33 of an
ornamental nature. The shell 31 has a number of pairs of
projecting bosses 34 and 36 having an envelope contour
matching the bore 17 and positioned to receive fastening
bolts 37, preferably with countersunk Allen heads, passing
~` '' .
`
~65~i3~
through appropriate apertures 38 in/the plate 27 and
engaging interior threads 39 in blind holes in the pairs
- of bosses 34 and 36. In this fashion the internal plate
27 and the aligned external shell 31 are pulled tightly
toward each other and clamped on the door panel with the
posts 26 passing through the apertures 24 and so holding
the bolt mechanism 13 in appropriate position and align-
ment. soth the exterior shell and the interior plate are
thus pulled tightly and firmly~-into engagement with the
panel and against external dislodgement or removal.
The interior plate 27 is formed with a central, deep,
keyhole-shaped recess and aperture 41 designed to accom- -
modate a standard cylinder body 42 such as is customarily
found in a key-operated, pin tumbler cylinder lock mech-
anism. The cylinder body 42 has a generally circular-
cylindrical portion with a radially and axially extending
rib or flag 43 thereon. The body 42 fits well within the
keyhole-shaped aperture 41 and the flag in the recess so
that the lock mechanism is thereby held against rotation
within the plate 27.
The p;late 27 and its accompanying mechanism are con-
cealed behind a conical cover 44 secured in place by a
pair of screws 46 passing through apertures in the cover
and engaging suitably tapped holes 47 in the plate 27, the ~'
-,7-
`
` :
1065~3~
cover preferably also receiving Welch plugs 48 to conceal
the heads of the screws 46 and making them generally un-
available after the initial installation has been made.
The cover is recessed to receive and closely abut one end
of the flag 43 and has a hole 49 to accommodate the body 42.
The cover 44 may be exposed or may carry a separate
skin 50 or other decorative embellishment provided with ~ -
a central opening 51 for the reception of the key 21 for
operating a rotary plug 52 in the lock mechanism. The
plug has the customary axially extending keyway 53 and
is also ~oined by a driver bar 54 to the bolt actuating
hub 56. When the shell 44 is provided with the decorative
cover 50, the cover is held in place by a screw 58 engaging
the shell 44. The Welch plugs can be dispensed with, if ;
desired, as the mechanism is enclosed by the cover 50.
The exterior shell 31 is also of generally frusto-
conical configuration and is provided withi a circular hole
61 therein generally concentric with a through axis 62 for
the assembly. If desired, the shell can have a decorative
sùrface or skin 63 crimped inwardly on the margin of the
hole 61 to retain the trim cover 63 in position. The
interior of the shell 31 is provided with a counterbore
64 as well as a recess 66 so as snugly to receive a lock
unit 67 of the customary kind, including a generally
circular-cylindrical or tubular body and an upstanding
,~ ''``, .
~_ .
.:.
.' ~ .. . .
, , : ;
1065638
or radial and axial flag or rib.
The lock body 67 has a through bore 68 in which a
plug 69 is rotatable about the axis 62. The plug is formed
- with an irregularly shapsd axially extending keyway 71
(Figure 3) therethrough and is formed with a flange 72 at
one end and carries a closure collar 73 at the other end.
The closure collar passes a driver bar seated in the bolt
actuator hub 56 in the usual way. The plug is rotatable
within the body but is not axially displaceable. The plug -
and body mechanism are substantially standard in that the
keyway 71 not only extends through the plug but likewise
extends through the flange 72 and leaves an edge notch 74
in the plug flange.
The exterior lock mechanism is retained in the
indicated position by a retainer 76 having a bridge 77-
extending there-across and designed to abut an end of the
flag on the lock unit 67. The retainer 76 is held in place
by fasteners 78 engaging tapped holes 79 in the outer shell
31. The retainer is extended to afford an offset loop 81
, 20 that generally surrounds and underlies the body 67 close-
ly so that the lock mechanism is maintained in proper
alignment along the axis 62. In this fashion the exterior
lock mechanism is restrained against any axial translation
and is also restrained against any lateral or tipping
motion off the axis and with respect to the exterior shell.
. ..
-.,, , - , . . .. : ~ . -,........ ,, , , . ~
~656~
Particularly pursuant to the invention, there is dis-
posed within the hole 61 and in general alignment with the
end of the plug 69 a guard plate 82 (Figure 5)~ This is
fabricated of extremely hard material so as to be virtually
drill-pro~f. The guard plate has a frusto-conical portion
83 merging with a peripheral flange 84 designed to turn
freely within the counterbore 64 of the hole 61. The
frusto-conical portion 83 likewise merges with a planar
front circle 86 normal to tha axis 62. The circle substan-
tially continues and is coplanar with the outer face of
the exterior shell.
The guard plate 82 is particularly contoured to pro-
vide a generally trapezoidal opening 87 therethrough. The
opening is made as small as possible in all dimensions.
But the opening 87 is made large enough freely to admit
through the opening any of a number of keys of different
cross-sectional shape, whatever keys are designed to oper-
ate within differently configured keyways within the plug.
- The aim is to leave as little as possible of the relatively
soft plug material exposed through the opening yet to af-
- ford easy access for any of the keys of the family of keys
designed to operate in the corresponding one of the family
of keyways. To assist in introduction of a key, the side
boundaries 89 of the opening may be interiorly converging
bevels.
~0'~
: - ~ :
; -
5~38
The opening 87 extends nearly all the way to the peri-
pheral flange 84 of the guard plate but is interrupted
short thereof. From the opening emerges an integral tab 91
formed from the material of the guard plate and thus ex-
tremely difficult to penetrate. The tab merges with the
guard plate near the periphery thereof. The tab is confi-
gured and bsnt so that it is moved out of the plane of the
circle portion 86 of the guard plate into the general plane
of the peripheral flange 84 thereof. The tab 91 is of ~'
an extent and configuration snugly and easily to fit wi~hin
the edge notch 74 of the plug flange. The side walls of
the tab make close contact with the side walls of the notch
so that there is an interengagement or interkeying of the
guard plate and the plug.
The guard plate is held axially for rotation within
the exterior shell by a ring 93 ha~ing a slight springiness
and pressed into the counterbore 64 in the exterior shellO
While the guard plate is freely rotatable about the axis
62 it is not axially displaceable. When assembled the
guard plate over-~ies and protects the otherwise exposed ;
face of the plug including the flange of the plug.
A similar construction is provided in connection with
the interior mechanism so that the flange end of the plug ~-
52 is overlain by a guard plate 94, duplicating the guard
plate 82 and similarly mounted in the interior cover 44
8 ~ ~
~" -
, 'e:
}
106~63~
with a retaining ring 96 holding the guard plate in posi-
tion.
The guard plates preclude the use of a drill of ade-
- quate size to cut axially into the end of the relatively
soft metal plug either interiorly or exteriorly and so
preclude inter~ering with the lock operation by such mea,ns.
While in this instancè the door bolt is provided with
. . .
key-operated mechanisms both interiorly and exteriorly and
such mechanisms are both protected by guard plates, in some
installations it is necessary only to protect the exterior
installation. When that is the case, the interior, as
shown in Figures 7 and 8, is alternatively supplied with
a thumb turn structure 101. This includes a cover cup 102
snugly fitting over the interior plate 27 and held against
that plate and in abutment with the interior surface of
the door panel by fastenings 103. These replace the fasten-
ings 46 but still are engageable in the tapped holes 47 in
the plate 27. Rotatable in an appropriate hub 104 on the
plate 102 is a cross bar 106 connected to a driver bar 107
replacing the driver bar 54 and int~rengaging with the
`, bolt mechanism and overlapping the other driver bar in
the bolt actuator hub 56.
Under these circumstances, when there is no interior
. ~ . .
key lock, the operation of the transverse thumb turn lever
or bar 106 rotates the driver bar 107 and causes projections
:',
,, .'"
,' ~ ~
- 1065~3~3
or retraction of the bolt 14. This latter installation
is utilized when it is considered that there is no danger
of tampering with the lock from the interior. In any
instance wherein the lock mechanism is to be protected,
whether on the interior or on the exterior, an arrange-
ment incorporating the rotatable guard plate is provided.
Interengagement of the tab 91 in the plug flange edge
notch 74 allows ready key access to the plug keyway, but
drilling or comparable access to the interior of the plug
mechanism is inhibited.
Furthermore, since the plate flange 81 is within the
counterbore 64 o the shell 31 and the guard plate 82 over-
lies the end of the plug 69, any tool engaging the plug,
particularly in the keyway and used in an attempt to draw
the plug out of the body by force, is ineffective as the
plate 82 acts as a barrier to such motion.
While, as an example herein, a pin-tumbler, deadbolt
lock has been shown and described, the arrangement for ~
improved security can also be used with latch bolts, pad- ~;
locks, wafer or lever locks and other arrangements in
which a key-controlled security device is involved, and
the claims herein should be read commensurately~
~''''".
,~ .` ~ .. ~
", ~ . .
