U.S. patent number 3,882,703 [Application Number 05/437,613] was granted by the patent office on 1975-05-13 for pick-proof lock mechanism.
Invention is credited to Robert Hermann.
United States Patent |
3,882,703 |
Hermann |
May 13, 1975 |
Pick-proof lock mechanism
Abstract
A pick proof lock mechanism for doors, consisting primarily of
spring loaded pin members with expandable doors and a two piece key
with a slip band.
Inventors: |
Hermann; Robert (Stronghurst,
IL) |
Family
ID: |
23737159 |
Appl.
No.: |
05/437,613 |
Filed: |
January 29, 1974 |
Current U.S.
Class: |
70/419; 70/417;
70/395; 70/455 |
Current CPC
Class: |
E05B
17/18 (20130101); Y10T 70/7802 (20150401); Y10T
70/7921 (20150401); Y10T 70/7932 (20150401); Y10T
70/8649 (20150401) |
Current International
Class: |
E05B
17/18 (20060101); E05B 17/00 (20060101); E05b
063/00 () |
Field of
Search: |
;70/417,419,421,423,424,455,395 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wolfe; Robert L.
Claims
What I now claim is:
1. A pick-proof lock mechanism, comprising in combination, a
cylinder and core assembly for application to a door or the like,
said cylinder and core assembly having a crush resistant ring, said
cylinder and core assembly including a pair of separateable door
members, said door members having over lapping step portions for
making engagement with each other, said cylinder and core assembly
including a pair of plugs having holes that slidably carry a pin
which is springly urged inward of said lock mechanism by means of
coil springs, said lock mechanism including a two piece key
comprised of a first member and a second member, said first member
having a series of projections on an end thereof, said projections
being receivable in openings upon an end of said second member,
said lock mechanism including a slip band of tubular character
having long and terminal grooves and protrustions in a central
opening thereof, said grooves and protrusions corresponding to a
configuration of said two piece key in order to fit on said key and
hold said key together, lugs on a rear of said doors riding within
a groove of said cylinder and core assembly, said plug being in
said groove alongside said door members and being held in place by
said pins which are fitted holes located in said grooves, said coil
springs being positioned over each said pin, and a press fit cap
being positioned over said spring.
2. The combination as set forth in claim 1, wherein said key
control lock has a removeable core thus making it possible to
change said key without necessity to dismantle said pick proof lock
mechanism in its entireity.
Description
This invention relates to locks and more particularly to a pick
proof lock mechanism of cylinder type.
It is therefore a principal object of this invention to provide a
lock mechanism which will be pick proof and which will have
expandable portions and pin means on its interior that when
incorporated with a two piece key will prevent a prospective
burglar from picking the lock.
Another object of this invention is to provide a pick proof lock
mechanism which will be of such structure so that it will be
impossible to insert anything between the door portions of the
mechanism, without forcing the lugs out into a groove beyond the
outer diameter of the core, thus stopping the rotation of either
the door portions or the core and the door portions are held closed
by the pressure from the spring loaded pins of the mechanism.
Still another object of this invention is to provide a lock
mechanism of the type described of which the door members of the
mechanism may not be drilled readily because the structure of the
door members alignment will prevent the door members of the
mechanism from aligning with the outer diameter of the core of the
mechanism and punching the lock mechanism will have the same end
result.
Yet another object of this invention is to provide a lock mechanism
of the type described which will not be able to be picked because
in order to pick a lock, the torque wrench used must be inserted
into the core to hold tension on the pins while the pins are
manipulated by bouncing them. The door members of the mechanism
would have to be held opened for the torque wrench, therefore the
outer diameters of the door members and the core will not be
aligned.
Other objects of this invention are to provide a pick proof lock
mechanism which is simple in design, adaptable to a majority of
existing commercial cylinder type locks, inexpensive to
manufacture, rugged in construction, easy to use and efficient in
operation.
These and other objects will be readily evident upon a study of the
following specification and the accompanying drawings wherein:
FIG. 1 is a front view of the present invention shown in elevation;
with parts in the normal rest position;
FIG. 2 is a partial cross-sectional view taken along lines 2--2 of
FIG. 3; showing relationship between doors and core groove;
FIG. 3 is a partial sectional view taken along lines 3--3 showing
doors and blocks with pins and springs relationship to the adapter
groove;
FIG. 4 is a cross-sectional and expanded plan view of the
separatable door members of the invention showing interlocking
feature of the door union and the rotational operated holes in the
doors.
FIG. 5 is a cross-sectional view taken along lines 1--1 with the
operational key inserted to show relationship between the key, core
and functional pins;
FIG. 6 is an expanded view of components showing their relationship
with each other;
FIG. 7 is an enlarged plan view of the twopiece key of the present
invention shown with the two members separated;
FIG. 8 is a plan view of flexible slip band of present
invention;
FIG. 9 is an end view of FIG. 7 in elevation.
According to this invention, a pick-proof lock mechanism 10 is
shown to include a cylinder and core assembly 11 having a crush
resistent ring 12. An adapter plate 14 is secured to cylinder place
13 by means of suitable screw fasteners 15 (see FIG. 2). A groove
11' is milled within cylinder face 13 (see FIGS. 1 and 6) for a
purpose which hereinafter will be described.
Referring now more particularly to FIG. 3 of the drawing, one will
see a pair of separatable door members 16 and 17 having overlapping
step portions 17" for making engagement with each other. A pair of
holes 18 are one each carried within the door in which extrusions
18' of key member 29 of key 28 will function as hereinafter will be
described and member 16 and 17 cylinder face and a lug 19 is
slideable within the slot 11' of cylinder face 13. The lugs 19 are
carried within the groove 11' of the core 21 of mechanism 10.
The opening 22 receives a pair of plugs 23 which have holes 24
which slideably carries a pin 25 which is springingly urged inwards
of mechanism 10 by means of a coil spring 26. Holes 24 are closed
off by means of a press-fitted cap 27 and plugs 23 are retained
within mechanism 10 by means of pins 23' within holes 23.1 in
cylinder face 13's groove 11'.
Referring now to FIGS. 7, 8 and 9 of the drawings, one will see a
key 28 having a member 29 with projections thereof, 30. The second
number 31 of key 28 includes openings 32. The slip-band 31 of key
28 includes openings 32. The slip-band 33 is provided with a
plurality of internal lands 34 and grooves 35 for accommodating key
28 in a manner which hereinafter will be described.
It shall be noted that lock mechanism 10 includes the conventional
type cylinder 11 with core 21 and with the milled groove 11'. The
lugs 19 on the rear of door 16 and 17 will ride within the groove
11' when the door member 16 and 17 are inserted into the groove 22.
The plug members 23 are then assembled into the groove 22 along
side the door member 16 and 17 and will be just held in place by
suitable pins 23' fitted into holes 23.1 as shown in FIGS. 3 and 6
of the drawings. The pins 25 are inserted into the openings 24 and
are followed by the springs 26 and then finally the press-fitted
cap 27. The plate 14 with the aforementioned assembly contained
within groove 22 is then positioned over the face of the
conventional cylinder and core assembly 11. The door members 16 and
17 are fitted together when closed, by over-lapping as is more
readily seen in FIG. 4 of the drawings.
It shall also be noted that due to the type of conventional
cylinders and core assembly 11 used for illustration, the core face
is recessed into the cylinder face and therefore necessitates a
deeper lug penetration into the core face than if the conventional
cylinder and core assembly had flush faces.
The two-piece key 28 is held together by means of slip band 33 for
non-operational transport carrying only. In operation, the
two-piece key 28's member 31 when inserted into the lock mechanism
10 will remain in the lock core 21 as shown in FIG. 5 thus aligning
the conventional shear line 36' of the contained pins 36, thus
preparing the core 21 for rotation which cannot take place until
the front member 31 of the key 28 is fully inserted enabling the
doors 16 and 17 outer diameter to become the same diameter as the
core 21 outer diameter shown in FIG. 5. Also enabling lugs 19 of
doors 16 and 17 to rotate within groove 11'. The core 21 and doors
16 and 17 must rotate together when projecting lugs 18' of key
member 29 are inserted into the openings 18' into the doors 16 and
17 the heretoafter described enabling the combination to be rotated
so as to activate the lock 10.
It shall be noted further that it is impossible to insert any thing
between the door 16 and 17 without forcing lugs 19 out into the
groove 11' beyond the outer diameter of the core 21 which will stop
the rotation of either doors 16 and 17 or the core 21. The doors 16
and 17 are held closed with a pressure from the springs 26 and the
loaded pins 25 in the plugs 23. The doors 16 and 17 cannot be
drilled readily because construction of doors 16 and 17 alignment
will again prevent the doors 16 and 17 diameter from aligning with
the outer diameter of the core 21.
It shall also be recognized that with the heretofore described
invention, unauthorized entry by picking cannot be successfully
accomplished and difficult key duplication of the operating key 28
adds to the security benefits of the instant invention which are
not founded in the prior art.
The key control lock 10 also has a removeable core 21 thus making
it possible to change the key 28 to be used in connection with the
lock 10 without having to dismantle lock 10 in its entirety.
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