U.S. patent number 3,827,266 [Application Number 05/277,565] was granted by the patent office on 1974-08-06 for bar lock assembly.
This patent grant is currently assigned to BMR Security Products. Invention is credited to Russell W. Walters.
United States Patent |
3,827,266 |
Walters |
August 6, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
BAR LOCK ASSEMBLY
Abstract
A locking bar assembly for constraining opposing movable section
elements. The assembly includes a pair of strike plates with each
having one lug element. Each strike plate is rigidly secured to a
respective section element in a manner such that bore through
openings formed in each lug may be aligned. A bar lock mechanism is
insertable through the bore openings in order to constrain the
movable section elements. The locking bar assembly further includes
a releasable capturing mechanism which provides for an external
attacking force to be transmitted to the strike plates instead of
to the bar lock mechanism.
Inventors: |
Walters; Russell W. (Reading,
PA) |
Assignee: |
BMR Security Products (Reading,
PA)
|
Family
ID: |
23061421 |
Appl.
No.: |
05/277,565 |
Filed: |
August 3, 1972 |
Current U.S.
Class: |
70/104; 16/263;
16/386 |
Current CPC
Class: |
E05B
63/12 (20130101); F16B 41/005 (20130101); E05D
11/1007 (20130101); E05Y 2900/132 (20130101); Y10T
70/5212 (20150401); Y10T 16/557 (20150115); Y10T
16/536075 (20150115) |
Current International
Class: |
F16B
41/00 (20060101); E05D 11/00 (20060101); E05D
11/10 (20060101); E05B 63/12 (20060101); E05B
63/00 (20060101); E05b 063/00 () |
Field of
Search: |
;70/1,57,91,101,102,104
;16/143,144,168,169,171,176 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Assistant Examiner: Tremblay; Richard P.
Attorney, Agent or Firm: Maleson, Kimmelman & Ratner
Claims
What is claimed is:
1. A locking bar assembly comprising
a. a pair of strike plates, each of said strike plates having a
respective lug member formed thereon;
b. bar lock means insertable through bores formed within each of
said lug members when said bores are aligned in a predetermined
direction;
c. each said lug member having an upper surface, a lower surface
and an outer side surface, said upper and lower surfaces formed
transverse of said bore within said lug member, said outer side
surface having at least one larger diameter section and at least
one smaller diameter section, said outer side surface formed
between said upper and lower surfaces;
d. at least one first mating means formed by at least one of said
strike plates; and,
e. at least one second mating means formed on and shorter than an
outer side surface of at least one of said lug members, said first
mating means of one of strike plates and said second mating means
of said lug member of the other of said strike plates being
received one in the other when said bores are aligned in said
predetermined direction.
2. The bar lock assembly as recited in claim 1 where said bar lock
means includes a locking pin insertable into a first detent formed
in a wall member defined by one of said bores of one of said lugs,
said bar lock means passing through at least a portion of each of
said bores for constraining said strike plates each to the
other.
3. The bar lock as recited in claim 2 including a second detent
formed in said wall member for insertion of said locking pin of
said bar lock means, said second detent being positionally located
to permit said locking pin insertion when said bar lock means
extends through only one of said bores.
4. The bar lock as recited in claim 1 including means for movably
restraining said bar lock means within one of said bores formed
within one of said lugs.
5. The locking bar assembly of claim 1 in which said first and
second mating means together comprise a tooth and groove
combination.
6. The locking bar assembly of claim 5 in which said groove extends
over a substantial portion of the periphery of an outer side
surface of said lug.
7. A locking bar assembly comprising
a. a pair of strike plates, each of said strike plates having a
respective lug member;
b. bar lock means received through bores formed within each of said
lug members when said bores are aligned;
c. each said lug member having an upper surface, lower surface and
an outer side surface, said upper and lower surfaces formed
transverse of said bore within said lug member, said outer side
surface having at least one larger diameter section and at least
one smaller diameter section, said outer side surface formed
between said upper and lower surfaces; and,
d. at least one of said strike plates and an outer side surface of
at least one of said lug members having mutual mating means, at
least one tooth on one and an accommodating groove on the other of
said mutual mating means.
8. The locking bar assembly of claim 7 in which said groove extends
throughout a predetermined portion of the periphery of an outer
side surface of said lug member.
9. The locking bar assembly of claim 7 in which each said tooth and
accommodating groove has inclined walls one with the other for
increasing shear reaction force contact areas.
10. The locking bar assembly of claim 7 in which each of said
strike plates has only a single respective lug member formed
thereon.
11. The locking bar assembly of claim 10 in which each of said
strike plates has only a single tooth and each of said lug members
has only a single groove.
12. A locking bar assembly comprising
a. a pair of strike plates, each of said strike plates having a
respective lug member formed thereon;
b. bar lock means insertable through bores formed within each of
said lug members when said bores are aligned in a predetermined
direction; and,
c. means for releasably capturing each of said lug members with the
strike plate of the other of said lug members comprising first
mating means including a tooth element formed by each of said
strike plates and second mating means formed by each of said lug
members, said tooth element of one of said strike plates being
insertable within a corresponding one of said second mating means
formed by said lug means of the other of said strike plates when
said bores are aligned in a predetermined direction whereby said
first and second mating means provide reaction forces responsive to
and substantially resist torgueing force applied to an interface
between said lug members, said reaction forces being substantially
formed external said bar lock means.
13. The locking bar assembly as recited in claim 12 where each of
said second mating means includes means for permitting rotation of
one of said strike plates with respect to the other of said strike
plates when said first means is inserted within said second mating
means.
14. The locking bar assembly as recited in claim 13 where said
second mating means includes a channel formed within each of said
lugs for insertion of each of said tooth elements, each of said
channels extending throughout a predetermined portion of the
periphery of each of said lugs.
15. The locking bar assembly as recited in claim 14 where each of
said tooth elements and said channels include inclined sidewalls
for increasing shear reaction force contact areas.
16. A locking bar comprising
a. a pair of strike plates, each of said strike plates having a
respective lug member formed thereon;
b. bar lock means insertable through bores formed within each of
said lug members when said bores are aligned in a predetermined
direction;
c. at least one first mating means formed by at least one of said
strike plates;
d. at last one second mating means formed on and shorter than an
outer side of at least one of said lug members, said first mating
means of one of strike plates and said second mating means of said
lug member of the other of said strike plates being received one in
the other when said bores are aligned in said predetermined
direction; and,
e. said first mating means including at least one tooth element
received within an accommodateing second mating means for
restraining motion between said strike plates in said predetermined
direction whereby said first and second mating means substantially
resist a torqueing force applied to an interface between said lug
members when said bores are aligned in said predetermined
direction.
17. The locking bar assembly of claim 16 in which said second
mating means includes a channel formed in a sidewall of at least
one of said lugs adapted for receiving therein said tooth element
of said first mating means.
18. The locking bar assembly of claim 17 in which each of said
strike plates has only a single respective lug member formed
thereon; each of said strike plates has only a single tooth element
and each of said lug members has only a single channel.
Description
BACKGROUND OF THE INVENTION
A. Field of the Invention
This invention pertains to the field of locking systems. In
particular, this invention relates to the field of bar locks. Still
further, this invention pertains to the field of bar locks which
transmit attacking forces to structural areas removed from the bar
lock mechanism.
B. Prior Art
Bar lock assemblies including a pair of strike plates with
alignable lugs are known in the art. However, in such prior
mechanisms, a lever or other mechanism is often used to attack
these mechanisms at the lug interface. In such cases, the attacking
forces are transmitted directly to the bar lock mechanism inserted
through the lug elements. This direct transmission of stress to the
bar lock mechanism results in a system which can not withstand high
jimmying forces and consequently, may be opened with relative
ease.
Other bar lock assemblies include strike plates with three or more
alignable lugs. In such cases, where the strike plates are attached
to movable elements to be constrained, no misalignment of the
elements can be tolerated. Where the strike plates are slightly
mismounted or where the movable elements are misaligned, the bar
lock mechanism can not be inserted through the lugs.
In other bar lock assemblies, an odd number (three, five, etc.) of
lugs are used. Such prior mechanisms do not permit the strike
plates to be cast identically. This type of construction leads to
higher manufacturing costs as well as adding to the basic
structural complexity of the locking bar assembly.
SUMMARY OF THE INVENTION
A locking bar assembly which includes a pair of strike plates
having respective lug member formed on each of the strike plates. A
bar lock mechanism is insertable through the bores formed within
each of the lug members when the bores are aligned in a
predetermined direction. Also formed on the strike plates is a
mechanism for releasably capturing each of the lug members with the
strike plate of the other lug member when the bores are aligned in
the predetermined direction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the bar lock assembly mounted on a
pair of movable section elements;
FIG. 2 is a sectional view of the bar lock assembly taken along the
section line 2--2 of FIG. 1;
FIG. 3 is a sectional view of the bar lock assembly taken along the
section line 3--3 of FIG. 2 showing a locking position in phantom
lines;
FIG. 4 is a front view of the bar lock assembly; and,
FIG. 5 is an exploded view of the bar lock mechanism.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to FIGS. 1, 2 and 3, there is shown bar lock assembly
or locking system 10 for constraining opposing movable section
elements or door members 12, 14. Each of strike plates 16, 18 are
securely mounted on a respective section element 12, 14 in a manner
such that upon interface of opposing strike plates 16, 18, bar lock
mechanism 20 may be inserted through lug or lug members 28, 30 of
each strike plate. This insertion constrains each strike plate 16
or 18 to the other and consequently, restrains elements 12 and 14
from movement with respect to each other. As a consequence of the
construction of locking system 10, it will be shown in following
paragraphs that this system permits some misalignment between door
members 12, 14 in a longitudinal direction as defined by
directional arrow 22 where lugs 28 and 30 may not be perfectly
aligned one with respect to the other. Additionally, the use of the
described two lug system also permits some misalignment between
plates 16, 18 due to the element 12, 14 warping or plate
mismounting while not affecting the locking capabilities of system
10. Further, it will be seen where a torqueing force is
interspersed at interface 26 between lug members 28, 30, such force
is transferred not only to bar lock mechanism 20 but is resisted by
strike plates 16, 18 in themselves, thus increasing the load factor
system 10 can accommodate when externally attacked.
In general, locking system 10 includes a pair of strike plates 16,
18 having lugs 28, 30 formed thereon. Each strike plate 16, 18 is
secured to a respective door member 12, 14 in a manner such that
lugs 28, 30 can be aligned in substantially a direction defined by
arrow 22. Bar lock mechanism is then insertable through aligned lug
members 28, 30 in order to maintain constrainment between section
elements 12, 14.
Strike plates 16, 18 are substantially formed in an "L"shaped
configuration having respective lug members 28, 30 formed thereon.
Each of strike plates 16, 18 are mounted to respective movable
section elements 12, 14 through a plurality of bolts, screws, or
some like mechanism represented by openings 32. In this manner,
strike plates 16, 18 are securely mounted to a respective element
12, 14. Plates 16, 18 are mated or interface with each other that
lugs 28 and 30 are aligned in a predetermined direction
substantially defined by the orientation of arrow 22. When lugs 28
and 30 are so oriented, bore openings 34 and 36 are in themselves
aligned each with respect to the other. Each of the lugs 28, 30
forms a base element of plates 16, 18 and is formed in one piece
construction with the vertically directed frame 31 of the
respective plate.
Each of strike plates 16, 18 are releasably secured to each other
through not only insertion of mechanism 20 but also through
releasable capturing mechanisms 38, 40. As shown in FIG. 4, this
combined element interaction serves to take up or transfer any load
stresses incurred at interface 26, from jimmying or other attack
procedure, the strike plates 16, 18 instead of the load being
directly transmitted to bar lock mechanism 20. Capturing mechanisms
38, 40 include first mating element or tooth 42 which is formed
integral with vertical frame plate 31 of each strike plate 16, 18.
As is seen, each tooth 42 extends in a lateral direction with
respect to orientation 22 and is insertable within second mating
element or channel 44. Channel 44 is formed within each of lug
members 28, 30 and extends through a portion of the circumference
of each member 28, 30. In this manner, elements 42 interface with
second mating elements 44 when bores 34, 36 are aligned in
predetermined direction 22 as defined by the bore axes.
Channels 44 include base surfaces 46 having a substantially
constant diameter throughout a portion of the lug peripheral
boundary. Channel sections 44 also include opposing sidewalls 48a-
b which provide a channel depth substantially equal to but slightly
greater than the depth of teeth 42. Second mating elements 44
further form a constant diameter channel base surface 46 taken with
respect to the bore axis. This constant diameter surface 46 extends
throughout a portion of the respective lug 28 or 30 perimeter until
channel demarcation line 50 is reached as is shown. Inclined wall
52, beginning at each line 50, forms into vertical frame 31 of each
plate 16, 18. Thus, channel 44 depth decreases from line 50 as a
function of lateral dimension until wall 52 forms into the vertical
leg of the appropriate strike plate 16 or 18. In this manner, it is
seen that either of strike plates 16 or 18 are free to rotate with
respect to each other through a portion of the total lug
circumference when bores 34, 36 are aligned. This freedom of
rotation extends to channel demarcation line 50 where teeth 42 then
contact inclined wall formation 52. However, it is now clearly seen
that although strike plates 16, 18 are free to rotate, they are
constrained in the direction 22 as well as in the rotative
direction 24.
Where external attack forces are applied at interface 26 through a
lever or other mechanism, there is usually applied a torqueing
force which tends to move lugs 28 and 30 away from each other in a
direction coincident with arrow 22. In such a case, first and
second mating elements 42, 44 provide reaction forces when
sidewalls 48a- b contact tooth sidewalls 54 and transmit the
external attack force to the strike plates 16, 18 and associated
lug members 28, 30, thereby substantially alleviating any force
stress directly on bar lock mechanism 20. In this manner, reaction
forces responsive to external attack torqueing forces, are
substantially taken up by structural elements 42, 44 and,
therefore, provide additional structural integrity for system 10.
Additionally, when a torqueing force is applied at interface 26,
tooth elements 42 may be displaced into channel base surfaces 46.
Such a displacement still alleviates any direct force applied to
bar lock mechanism 20 within bores 34, 36 since a substantial
amount of the stress is taken up on the external surfaces of lugs
28, 30.
In order to provide a greater shear area, thereby permitting larger
load resistance characteristics, tooth walls 54 and channel
sidewalls 48 may be inclined as shown. Inclination of sidewalls
provide a greater surface area when walls 48 and 54 contact each
other under force displacement conditions. Since the shear stress
capable of being absorbed is proportional to the contacting area,
an increase in the contacting area results in a direct increase in
the load carrying capability of the contacting members.
Bar lock mechanism 20 as shown in FIG. 5 includes a standard
cylinder lock 56 having a retractable locking pin 58. Cylinder lock
56 is insertable within through passage 60 of tubular element 62
where locking pin 58 is aligned with and passes through tubular
element sidewall opening 64. As is standard, cylinder lock 56 is
key actuated to cause extraction and retraction of locking pin 58
in a direction substantially normal to a line defining the axis of
cylinder lock 56. In this manner, with cylinder lock 56 inserted
within tubular element 62, bar lock mechanism 20 may be inserted
within aligned bore openings 34, 36 to rigidly constrain door
members 12 and 14 each to the other.
Locking pin 58 is insertable into first detent 66 formed in a wall
member defined by one of bore openings 34 or 36 within one of lug
members 28 or 30. In this manner, bar lock mechanism 20, may be
locked by extending locking pin 58 into first detent 66 where bar
lock mechanism passes through at least a portion of each of bore
openings 34, 36 thereby constraining strike plates 16, 18 each to
the other. As is seen, second detent 68 is formed within the wall
member defined by one of bore openings 34 or 36 at a predetermined
longitudinally directed distance from first detent 66. The
separation distance between detents 66 and 68 is substantially
equal to the distance necessary for the removal of bar mechanism 20
from one of bore openings 34, 36. In this manner, bar mechanism 20
may be retracted from one of lug members 28 or 30 and be locked to
only one of the lug members by extraction of locking pin 58 into
second detent 68. Thus, although bar locking mechanism 20 is locked
to one of lugs 28 or 30, free movement between movable elements 12
and 14 is attained. In this way, it is seen that bar lock mechanism
20 may be left attached and locked to one of the legs 28 or 30
while permitting complete freedom of movement of members 12 and 14.
Where detent 68 is not provided in system 10, locking pin 58
operates in the manner of a spring loaded latch bolt and key 74
unlocks only from detent 66. Opposingly, when detents 66 and 68 are
provided, locking pin 58 does not function as a spring actuated
locking pin but must be actuated by key 74 to lock or unlock from
detent 66 to 68 or in reverse order.
Additionally, bar lock mechanism 20 may be movably constrained
within bores 34, 36 through set screw 70 passing through a sidewall
of one of lug members 28, 30. Screw member 70 threadedly engages
lug member sidewall and is movable with respect thereto. Set screw
70 is further insertable within a channel or groove 72 formed
within tubular element 62 as shown and passing in a direction
substantially coincident with the axis direction of element 62. In
this manner, bar lock mechanism 20 may be slidably moved within
bores 34, 36 of lugs 28, 30 for a predetermined distance defined by
the length of groove 72. This mechanism prevents complete removal
of bar lock mechanism 20 from lugs 28, 30 while permitting
slideable movement therein.
A feature of locking system 10 is that mating strike plates 16, 18
are almost identical in construction. The only differences being in
that first and second detents 66 and 68 as well as set screw 70 are
found in only one lug member 28 or 30. In all other aspects
regarding construction material and dimensions, both strike plates
16 and 18 are substantially identical. In this manner, the major
elements of system 10 may be case or otherwise constructed in mass
volume thereby lowering manufacturing costs. Additionally, since
overall external dimensions are the same, mating of plates 16, 18
is ensured. In construction, plate members 16, 18 are formed of
hardened steel or some like material capable of maintaining
structural integrity when subjected to an attacking force.
It is also to be understood that mounting of system 10 to movable
section elements 12 and 14 is completely reversible with respect to
insertion of bar lock mechanism 20 within bores 34, 36, in other
words, system 10 may be turned upside down without loss of
operating function. Plates 16, 18 may be mounted to elements 12 and
14 at a height which would make it awkward to insert mechanism 20
from the top. This may occur when plates 16, 18 are mounted near a
ceiling or in excess of the height an operator may comfortably
complete the locking and unlocking operations. In such cases, the
system 10 may be mounted so that mechanism 20 is insertable from
the bottom. On the other hand, where system 10 must be mounted to
elements 12 and 14 near a floor, all that must be done is to invert
plates 16 and 18 and insert mechanism 20 from the top surface. This
invention capability provides a versatility of use for system 10
not usually found in other lock mechanisms of this type.
It should further be understood from the preceding description that
the use of two lugs 28 and 30 in combination with mechanisms 38 and
40 provide system 10 with a force carrying capability found ony in
locks having a number of lugs in excess of two as in this
invention. The use of two lugs provides for the solution of the
very practical problem of misalignment. The problem may take the
form of (1) misalignment between elements 12 and 14; (2)
mismounting of system 10 causing misalignment when elements 12 and
14 are brought together, or (3) a combination of element
misalignment and mismounting. Where three or more lugs are used in
a locking system, it is evident that any misalignment tolerances
must be very small since mating of the lock element is a critical
factor. In the present invention, where only two lugs 28 and 30 are
used, the aforementioned misalignment tolerances may be much
greater while still rendering a working locking bar assembly
10.
A further external attack may be made at point X, shown in FIG. 3,
by a tool to force tubular member 62 against blocked passage 34 in
lug 28. However, the clearance between locking pin 58 and detent 66
is greater than the clearance between the upper surface of tubular
element 62 and the blocked section of lug 28 within opening 34.
Therefore, no shearing force would be applied to locking pin 58 in
detent 66 and no force would be applied on the lug of set screw
70.
A further external attack may be made at point X, shown in FIG. 3,
by a tool to force tubular member 62 against blocked passage 34 in
lug 28. However, the clearance between locking pin 58 and detent 66
is greater than the clearance between the upper surface of tubular
element 62 and the blocked section of lug 28 within opening 34.
Therefore, no shearing force would be applied to locking pin 58 in
detent 66 and no force would be applied on the lug of set screw
70.
Additionally, it should be noted that tooth elements 42 extend into
the plane of interface 26, as shown clearly in FIG. 1. Further, the
upper portion of tube element 62 adjacent interface 26 when element
62 passes into both lugs 28 and 30 may be formed of hardened steel.
In combination, this provides protection from attack by a saw or
other implement being inserted into interface 26 since any cutting
force would be stopped by either the hardened steel portion of
element 62 and/or tooth element 42.
* * * * *