U.S. patent number 3,785,188 [Application Number 05/236,710] was granted by the patent office on 1974-01-15 for magnetic controlled door lock.
Invention is credited to Carl J. Drathschmidt.
United States Patent |
3,785,188 |
Drathschmidt |
January 15, 1974 |
MAGNETIC CONTROLLED DOOR LOCK
Abstract
A lock for a door, the lock including a safety feature that
prevents an intruder or unauthorized person from opening the lock;
the safety feature consisting of a magnetically operated mechanism
which is operative by a special key of unconventional design and
which magnetically pulls a part of the mechanism into an
operational position so it can co-operate with the remainder of the
mechanism for sliding a bolt between a locked and an unlocked
position.
Inventors: |
Drathschmidt; Carl J. (New
York, NY) |
Family
ID: |
22890625 |
Appl.
No.: |
05/236,710 |
Filed: |
March 21, 1972 |
Current U.S.
Class: |
70/276; 70/338;
70/134; 70/223; 70/413 |
Current CPC
Class: |
E05B
17/142 (20130101); E05B 47/0038 (20130101); Y10T
70/5827 (20150401); Y10T 70/7057 (20150401); Y10T
70/7452 (20150401); Y10T 70/5341 (20150401); Y10T
70/7904 (20150401) |
Current International
Class: |
E05B
17/14 (20060101); E05B 47/00 (20060101); E05B
17/00 (20060101); E05b 019/26 (); E05b
035/10 () |
Field of
Search: |
;70/276,338,339,336,404,413,427,387,222,223 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,343,757 |
|
Oct 1963 |
|
FR |
|
970,002 |
|
Jun 1950 |
|
FR |
|
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Tremblay; Richard P.
Attorney, Agent or Firm: Miller; Carl
Claims
Having described my invention, what I claim as new and desire to
secure by Letters Patent is:
1. In a magnetic controlled door lock, the combination of a case
containing a magnetic controlled lock mechanism and a conventional
lock, said conventional lock being operative by a first key, and
said magnetic controlled lock mechanism being operative by a second
key, said conventional lock being connected to a cross pin that
normally blocks entry of said second key into said magnetic
controlled lock mechanism, said magnetic controlled lock mechanism
including a stationary barrel with an opening therethrough and into
which said second key is insertable, said second key having a
permanent magnet on an end thereof, a shaft of said magnetic
controlled lock mechanism having a forward end thereof slidably
seated in an inner end of said barrel opening, a magnet secured on
said end of said shaft, said key magnet being engagable with said
shaft magnet so to cause said shaft to slide forwardly when said
magnets are engaged and said key is pulled in a direction outwardly
of said barrel, said shaft forming a unit with a gear integral with
an intermediate portion of said shaft and a knob secured on an
opposite rear end of said shaft, a bolt slidable inwardly or
outwardly of said case to respectively unlock or lock a door, said
bolt having a toothed rack, and a spring means normally urging said
unit rearwardly in said case so that the gear is normally out of
engagement with the rack, forward movement of said shaft causing
engagement of the gear with the rack whereby turning of the gear
will cause the bolt to slide inwardly or outwardly of the case.
2. The combination as set forth in claim 1 wherein said key, when
pulled, moves said unit so said gear engages said toothed rack of
said bolt, said unit and second key having interfitting notches and
protrusions respectively so to permit rotation of said gear for
sliding said bolt.
Description
This invention relates generally to locks. More specifically it
relates to key operated locks.
A principal object of the present invention is to provide a lock of
unusual design that does not receive a conventional type of key, so
that it is not able to be picked by a thief in the usual way so to
slide a lock bolt in an unlocked position.
Another object is to provide a lock which is magnetically operated
by a magnetic key instead of a conventional profile shape key.
Yet another object is to provide a magnetic controlled lock which
accordingly is ideal for use on doors so to assure unauthorized
entry is prevented.
Other objects are to provide a MAGNETIC CONTROLLED DOOR LOCK, which
is simple in design, inexpensive to manufacture, rugged in
construction, easy to use and efficient in operation.
Further objects of the invention will appear as the description
proceeds.
To the accomplishment of the above and related objects, my
invention may be embodied in the form illustrated in the
accompanying drawings, attention being called to the fact, however,
that the drawings are illustrative only, and that changes may be
made in the specific construction illustrated and described within
the scope of the appended claims.
FIG. 1 is a side cross sectional view of the invention.
FIG. 2 is a cross sectional view taken on line 2--2 of FIG. 1.
FIG. 3 is a cross sectional view taken on line 3--3 of FIG. 1.
Referring now to the drawing in detail, the reference numeral 10
represents a magnetic controlled door lock according to the present
invention wherein there is a lock case 11 for being mounted in a
door and which includes a mechanism 12 therewithin for operating a
slidable bolt 13 for sliding outward of a side edge of the case and
into a bolt opening 14 located in a door jamb 15, so that the door
can be thus locked.
The mechanism 12 includes stationary block 16 secured by weld 17 to
the case, the block having an opening 18 therethrough in which
there is a stationary barrel 19, the barrel having a cylindrical
central opening 20 therethrough and for receiving a key 21 in one
end thereof, the other end of the opening having a shaft 22 fitted
thereinto, the shaft being on one end of the slidable unit 23
supported slidably free in a bearing opening 24 of a stationary
support bracket 25 secured by weld 26 to the case. The unit 23
included a gear 27 integral with the shaft 22 and which is located
on one side of the bracket 25, the other end of the shaft extending
outward of an opening 28 of the case through which a knob K
integral with the shaft protrudes so it can be manually operated by
a person on the secured side of the door, such as the inside of a
house or apartment. A compression coil spring 29 around the shaft
bears at one end against the stationary bracket, and at its other
end bears against a shoulder 30 of the knob so to normally keep the
gear 27 from engaging a toothed rack 31 formed on an edge of the
bolt 13. The end of the shaft 22 which extends into the opening 20
of the barrel 19 has a concentric opening 32 within the interior
end of which there is secured a steel block or permanent magnet 33.
The edge 34 around the opening 32 of the shaft has a pair of
diametrically opposite notches 35 therethrough; the notches, magnet
and opening 32 being associated with operation of the key 21.
The key 21 comprises a cylindrical shank 36 wiht a flat handle 37
on one end, the other end of the shank having a concentric opening
38 in which a magnet 39 is secured; the end of the magnet 39
protruding outwardly from the edge 40 a distance equal or slightly
longer than the length of the opening 32 between edge 34 and the
face of magnet or steel block 33. The edge 40 of the key has a pair
of opposite protrusions 41 thereon for fitting into notches 35. As
shown in FIG. 1, if part 33 is a magnet, it is polarily aligned so
to be attracted by magnet 39 when the key is inserted into opening
20.
The key is normally prevented entry into the lock by a cross pin 42
but which can be slided out of the way by a second key 43 being
inserted into a lock 44 mounted in the case 11, the lock 44
permitting rotation of a radial arm 45 connected pivotally by rivet
46 to one end of a lever 47 which at its other end is pivotally
connected by a rivet 48 to protruding end 49 of the cross pin 42.
The lock 44 comprises any conventional key operated lock in which
the turning of the key causes a rotation of the lock output
shaft.
Thus in operative use, an authorized person can open the door for
entry by employing two keys 43 and 21. He first inserts key 43 and
rotates the lock so that the cross pin 42 slides out of opening 20
so to prevent entry of key 21 therein. He then inserts the key 21
fully in until the magnets 39 and 33 contact. He then pulls
slightly outwardly so to cause the unit 23 to slide in an outwardly
direction until gear 27 engages rack 31. He then rotates the key
21, the protrusions 41 being engaged in notches 35, thus causing
the bolt 13 to slide back into case 11 so that the door is thus
unlocked. To lock the door the process is reversed. The lock is
operable from the inner side by the knob K.
While certain novel features of my invention have been shown and
described and are pointed out in the annexed claims, it will be
understood that various omissions, substitutions and changes in the
forms and details of the device illustrated and in its operation
can be made by those skilled in the art without departing from the
spirit of the invention.
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