SERRURE A PENE TOURNANT

DROP-BOLT LOCK ASSEMBLY

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
A high security drop-bolt lock assembly for a door
includes a cylinder lock carried by a guard plate
positionable on the outside of the door with the cylinder
lock within the door, and a drop-bolt assembly on the
inside of the door. The drop-bolt assembly is connected
to protected studs extending from the guard plate to make
a strong unitary construction extremely difficult to
defeat and protecting the cylinder lock behind the guard
plate and within the door.

Revendications

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A high security defeat-resistant, drop-bolt lock assembly
for a door, the lock assembly comprising:
a) a cylinder lock having an operating member extending
therefrom,
b) a thick, tamper-resistant, substantially planar cylin-
der lock guard plate adapted to be mounted against one side of
the door, the guard plate mounting on one side thereof the cyl-
inder lock and protecting the same,
c) mounting studs integral with the guard plate and ex-
tendable through holes in the door when the guard plate is
mounted against one side of the door,
d) a drop-bolt assembly positionable on the other side of
the door and containing mounting portions on a housing thereof,
e) hardened, stud-protecting sleeves positionable to slip
over each mounting stud, each sleeve having one end connectable
with the guard plate on one side of the door and an opposite end
connectable with the drop-bolt assembly on the other side of the
door,
f) means cooperating with the guard plate studs, the
sleeves and the mounting portions of the drop-bolt housing for
connecting the housing, sleeves and guard plate and for securing
the drop-bolt assembly housing to the guard plate studs and
thereby integrally connect and secure the drop-bolt assembly
housing, the sleeves and the guard plate to provide an integral
connected assembly of the guard plate on one side of the door
and the drop-bolt assembly on the other side of the door with
the cylinder lock assembly sandwiched therebetween and protected
inside the door.

2. A lock assembly as in claim 1 further comprising an addi-
tional cylinder lock for operating the drop-bolt in the drop-
bolt assembly from the inside of the door.
3. A lock assembly as in claim 2 wherein the means for secur-
ing the drop-bolt assembly to the mounting studs of the guard
plate assembly includes internally-threaded nuts cooperating
with the threaded portions of the studs and extending through
holes in mounting flanges of the housing for the drop-bolt
assembly.

Description

1~i4~
1233-13$A DROP-BQLT DOOR LOCK ASSEMBLY
RX-5t0
BACKGROUND-OF THE INVENTION
Field of the Invention
This invention relates to improvements in drop-
bolt-type lock assemblies, and particularly to such an
S assembly operated from a protected hi~h security lock
cylinder.
Prior Art
It is known in the art that drop-bolt locks
provide extremely good resistance to defeat by jimmying,
chiseling, prying and the like.
However, even if a drop-bolt lock is highly
resistant to defeat, it can be compromised if the
cylinder which operates the lock bolt can be defeated.
It is also known in the art to protect lock
cylinders by guard plates or the like. Nevertheless,
there remains a need in the art to provide a drop-bolt
lock and cylinder assembly which is highly resistant to
defeat by jimmying, chiseling and prying. _ _
SUM~ARY OF THE INVENTION
This invention provides a drop-bolt lock assem~ly ~
for a door in which the drop-bolt assembly is on one side
of the door, e.g., the inside, and an operating lock
cylinder is accessed from the outside of the door. The
lock cylinder is protected by a heavy guard plate and the
body of the cylinder lock is within the body of the door,
while the drop-bolt is on the inside surface of the door.
Thus, the cylinder lock is sandwiched between an outside
guard plate and the inside drop-bolt operating housing.
The guard plate and drop-bolt operating housing are
interconnected so as to provide an extremely rugged and
s,trong defeat-proof lock bolt assembly.
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T I:r~` r)r~:SCr~:[ l~rION 0~ WI~IC.S
l~k~. 1 i5 a perspective view illustratinc3 tl)e
protectec1 drop-lolt lock assc~ ly oE l:l~is invention.
I`ic~. 2 is a sic1c elevation~l view witl) portions
sllown in section Eor the sake o~ clarity.
Fic~. 3 is an elevation view taken alonc~ line 3-3
o~ Fig. 2 and also illus~rating ~he door jam cln~1 keeper
~or the drop-bolt.
D~T~ILI~D DESCI~IPTION 0F Tl!E PnE~EI~I~ED r'M~ODIM~N~`
rhe principal componer)ts o~ the invention as ;hown
in Fig. 1 include a drop-bolt asselnbly 10 a cylinder
lock assembly 12 a guard pl~te as.sembly 1~ and a keeper
or strike 16 see l~ig. 3. 'l~e c1rop-hol~ asselnl~ly 10 is
mounted flusl~ on one sicie o~ a ~ioor 1). 'l'he c100r D has
small holes Dh (3rilled there~ilroucJh on a pattern arounci a
lar~e hole l)ll or a cylinder loclc. The cylinc1er lock
assembly 12 extends into the lar~Je hole Dll Oe the c700r D
and the c~larcl plate assembly 1~ mounts ~lush to the
outside o~ the door as illustrated in tl1e drawings. ~rhe
keeper 16 is nloun~e<1 on tl1e insicle o~ the cloor to
cooperate with tlle ~lrop-bolt asselnb:Ly 10 ais is known in
the art.
'I`he c1r~p-bolt as-;ellll)ly 10 inclllcles a ho-lsing 1
hclvin~ ~lloun~inc~ El~n~3es 20 ex~enc1incJ rolll ti~e top and
bottolll sicles thereoE. ~rhese mour)tinc~ ~langes have a
plurality o i~oles positioned to mate witi~ the position
o~ the holes ~h in the door D. The ec1cJe o~ the drop-bolt
assembly adjacent the keeper 16 has spaces 2~ ~or mating
Witl1 tl1e keeper the drop-l~olt extenclincJ vertically
~n ~hroul3h the spaces 2~ as is lcnown in tl1e art.
~ rhe drop-bolt hO-lSinC~ 1~ incorporates mechanisms
whic11 oper~te ~hC! drOP-l)0~ ;UCI) Inechanisms arc the
su~)ject o al1o~her app1 iCcl~iOIl assi~nec1 to Mecleco
Security Loclcs Inc. Canadian ~pplication Serial No.
488~l740 The mechanisms in the housing are covered by a
s `, ~ ~
j .. ~.,
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a plate 26 which p~ovides access from the rear side of
the housing, see Fig. 3.
The cylinder lock assembly 12 inciudes a cylinder
lock 36 preferably of the high security type
~anufactured by Medeco Security I.ocks, Inc. of Salem,
Virginia, and disclosed in U.S. Patent No~ 3,499,302.
The lock has an operating tang 38 which extends through
plate 26 and into the mechanism within the drop-bolt
housing 18 for operating the drop-bolt from the lock
cylinder.
The keeper or strike 16 is formed of a keeper-
mounting plate 32 and integral keeper rings 34 which
extend into the spaces 24 to provide the holding function
when the vertical drop-bolt is extended. The keeper
mounting plate may be flat to fit flush or angled to fit
a corner.
The guard plate assembly 14 is preferably formed
with a thick protective plate 40 and a decorative cover
plate 42. The guard plate assembly mounts the cylinder
loc~ 36 as is known, and preferably as in the commercial
guard plate sold by Medeco Security Locks~ Inc. under the
trademark BODYGU~RD and as disclosed in United States
PQtent Mo. 4,530,223 filed November 1, 19~2 and assigned to
Medeco Security Locks, Inc. As disclosed in this patent
application, a plurality of studs 44 are integral with
the protective plate 40 and extend rearwardly therefrom.
These studs 44 extend through the holes Dh in the door D
and have threaded portions 46 at their ends. Hardened
stud-protecting sleeves 48 are slipped over each of the
studs 44 as shown in Fig. 1 to prevent sawing or
otherwise cutting of the studs in an attempt to defeat
the lock.
The threaded ends 46 of the studs 44 cooperate
with internal threads in housing mounting screws 50 which

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extend through holes 22 in the mounting flanges 20 of
housing 18, see Figs. 1 and 2.
In installation, the door D is drilled with a
template to provide the holes Dh and DH, the guard plate
assembly 14 with the cylinder lock assembly 12 therein is
placed against the door so that the cylinder locX
assembly 12 extends within the door and the tang 38
extends through the door for cooperating with the
drop-bolt assembly 10O The drop-bolt assembly 10 is
mounted flush on the inside surface of the door and is
connected via mounting screws 50 to the ends of the
sleeve-protected studs 44. A proper key (not shown) in
cylinder lock 36 will operate tang 38 to cause the drop-
bolt to either extend through or be retracted from a
vertical path extending through spaces 24 and rings 34 of
the keeper 16 If desired, the drop-bolt can also be
operated from the inside of the door via thumb key 30 and
lock cylinder 28. ~
As a variation, the drop-bolt can be operated with
2.0 a single cylinder, namely, cylinder 36 rather than the
double cylinder arrangement shown.
The arrangement provides an extremely strong,
defeat~resistant lock bolt assembly not available with
the known prior art constructions.
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