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Патент USA US3023611

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March 6, 1962
Filed June 16, 1960
INN-Ill! llll‘:
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F .3 39 44 27
45 x
'48'47 44.3332 34 47
Ru/ph Lu/kar/ZZ'
Joseph‘ B. McGaever
Patented Mar. 6, 1962
having a central cylindrical bore 21 formed there
3,023 601
through, and including a rearwardly projecting externally
Ralph Luikart II, 1514 Anacapa St., and Joseph B. Me
Geever, 850 Estrella Drive, both of Santa Barbara,
with. The tubular extension 22 is adapted to have screw
screw-threaded tubular extension 22 formed integral there
threaded engagement within the screw-threaded bore 16,
Filed June 16, 1960, Ser. No. 36,632
1 Claim. (Cl. 70-297)
and a locking nut 23 and lock washer 24 on the ex
tension 22 serve to lock the extension and head in the
selected axially adjusted position relative to the ?xed
This invention relates to a lock or fastener for doors,
sliding drawers, and the like.
base 13.
The bore 25 of tubular extension 22 is somewhat
A primary object of the invention is to provide a
larger than the head bore 21, and a lateral shoulder
safety door lock for medicine cabinets or the like, de
26 is formed at the rear end of the bore 21, where the
signed particularly to prevent children from gaining ac~
same communicates with the enlarged bore 25.
cess to the cabinet where poisons of various kinds may
An elongated generally rectangular locking member
be stored.
15 or bar 27 is disposed forwardly of the cabinet door 11
Another object of the invention is to provide a door
and adjacent the forward face of the head 12. The
fastener of the above-mentioned character which is rela
width of the locking bar or swinging bolt 27 is pref
tively simple and economical in construction, compact
and strong and durable.
erably substantially equal to the diameter of the head
12 and the locking bar extends for substantial distances
Still another object is to, provide a safety lock or fas 20 on opposite sides of the head so as to be capable of
tener of the mentioned character which is easy to operate
overlapping engagement with the edge portion of the
' by‘ adults but perplexing and substantially impossible to
cabinet door 11.
operate by small ‘children without knowledge of the work
An axially extending screw 28 has a cylindrical head
ings of the simpli?ed combination mechanism.
portion 29 engaging rotatably within the bore 25 of ex
Another object is to provide a cabinet door lock which 25 tension 22, and a reduced cylindrical shank portion 30
is adjustable and easy to install adjacent the cabinet
engaging rotatably within the bore 21 of the head 12.
door or any other door which it is desired to secure
The head of the screw 28 has a socket 31 to facilitate
against opening by children.
tightening the screw. A forward reduced screw-threaded
.Other objects and advantages of the invention will be
extension 32 on the screw 28 has screw-threaded engage
apparent during the course of the following description. 30 ment Within a centrally located screw-threaded opening
In the accompanying drawings, forming a part of this
33 in the rear face of the locking bar 27, at the longi
application, and in which like numerals are employed to
tudinal and transverse centers thereof. The screw 28v
designate like parts throughout the same,
has a shoulder 34 for positive engagement with the rear
FIGURE 1 is a front elevation of a bathroom medi
face of the locking bar 27, so that the locking bar may
cine cabinet or the like, equipped with the safety door 35 be rigidly secured to the screw 28 for rotationthere:
lock according to the present invention,
with as a ‘unit relative to the stationary head 12. and its
FIGURE 2 is a plan view of the lock on an enlarged
extension 22.
scale partly in section,
FIGURE 3 is an enlarged front elevation of the lock
and associated elements,
The head 12 is provided in its forward face with four
FIGURE 4 is a vertical section taken on line 4—4 of
preferably equidistantly spaced deep cylindrical recesses
35, FIGURES 4 and 5, and these recesses are disposed
opposite the central portion of the locking bar 27 and
have the spaced arrangement indicated in FIGURE 3.
FIGURE 5 is a vertical section taken on line 5-5 of
Companion deep cylindrical recesses 36 are formed in
the rear face of the locking bar 27, which rear face sub
FIGURE 6 is a central horizontal section through the 45 stantially abuts the forward. face of the head 12 ‘slid:
ably. When the locking’ bar 27 is arrangedhorizontally
FIGURE 7 is a rear side elevation of the lock partly in
as in FIGURE 3, or vertically as indicated'by dotted
lines in FIGURE 1, the recesses 35 and 36 are in regis
In the. drawings, wherein for the‘ purpose of illustra
tration ‘as indicated clearly in FIGURES 4.21miv 5. , In
tion is shown a preferred embodiment of the invention, 50 all other angular positions of the locking bar 27, the
the numeral 10 designates a vertical wall upon which is
mounted a conventional medicine cabinet or the like hav
recesses 35 and 36 are out of registration.
With continued reference to FIGURES 3 through 6,
diagonally opposite pairs of the recesses 35 contain rela
ing the usual horizontally swingable door 11 hinged
thereto in a conventional manner.
The lock or fastener proper for the door 11, accord
ing to the invention, is indicated generally by the numeral
12’ in FIGURE 1, and the lock is installed upon the
wall 10 adjacent to the swingable edge of the door 11,
tively long coil springs 37, and the corresponding di
agonally opposite recesses ‘36 contain relatively short
reciprocatory plungers 38, havingreduced operating pin
extensions 39, extending slidably through small open
ings in the forward face of locking bar 27. The operat:
as indicated in the drawings.
ing extensions 39 project forwardly of the locking bar
The lock 12' comprises a generally cylindrical base 60 27 so as to be engageable by the ?ngers of the person
or mounting member 13, preferably having an enlarged
operating the lock. Lock balls 40 are interposed between
rear ?ange 14 engageahle with the wall 10, and pref
the springs 37 and plungers 38, Within the bores 35 and
erably provided upon its rear face with a plurality of
36 and these lock balls normally span the entrance por
spaced prongs 15 which penetrate the wall surface to
of the registering bores 35 and 36 adjacent the
prevent the base 13 from turning. The base 13 has a 65 opposed faces of the head 12 and locking bar to lock
forwardly opening central screw-threaded bore 16, hav
the latter against rotation relative to the head 12.
ing a rear undercut portion 17, and a rearwardly open
The other diagonally opposite pair of recesses 35 con
ing tapered bore 18, adapted to receive the head of a
tain relatively short coil springs 41 and balls 42, as
wood screw 19, or the like, utilized for rigidly securing
70 shown, and the corresponding diagonally opposite re
the base upon the wall 10 in the selected position.
A relatively stationary cylindrical head 12 is provided,
cesses 36 contain relatively long reciprocatory plungers
43 having forward reduced operating pin extensions 44,
projecting forwardly of the locking bar 27, and extending
slidably through small openings in the forward face of
the locking bar, FIGURES 4 and 5.
The balls 42 are normally maintained bodily within
their recesses 35, and the plungers 43 are normally bodily
within their recesses 36, so that these plungers normally
have no locking in?uence upon the locking bar 27 and
head 12.
Outwardly of the head '12 and near the ends of the
locking bar 27, the same is provided in its rear face with 10
additional spaced pairs of deep cylindrical recesses 45,
containing coil springs 46 and forwardly projecting dummy
duced into the ‘bore of the tubular extensions 22. The
threaded extension 22 is then engaged into the threaded
bore 16 of the base 13 and adjusted to position the lock
ing bar 27 properly relative to the door 11, and the lock
nut 23 is tightened and the unit is then ready for use
in the described manner.
From the foregoing it is obvious that the lock of this
invention can also be utilized in connection with sliding
drawers or the like. When used in connection with
drawers the mounting member 13 would be mounted
adjacent one edge of the drawer or could be readily
mounted on the ?xed bar above a drawer or on the
operating pin elements 47, having the same appearance , ?xed bar between two drawers, so that the rectangular
locking member can be pivoted into overlapping en
as the previously described pin elements 39 and 44. The
pin elements 47 have enlarged heads v41,8 within the re 15 gagement with an edge portion or portions of the drawer
cesses 45, FIGURE 7. The spacing of the recesses 46
and pin elements 47 is as shown in FIGURE 3, and all
of the operating pin elements are arranged in two parallel
longitudinal rows along the locking bar 27 and equi
distantly spaced, as in FIGURE 3. Resilient pads 49 are
secured in any suitable manner to the rear face of the
locking bar 27 near the ends of the latter and on opposite
sides of the head 12. These pads serve to maintain the
light coil springs 46 within the recesses 45, and the pads
49 are engageable ?rmly against the front face of the
cabinet door 11 for securing the same, without scratching
or marring the door. The endmost pairs of pin elements
or drawers, respectively, to maintain the same in a locked
condition, thus preventing access thereto by small children.
vIt is to be understood that the form of the invention
herewith shown and described is to be taken as a preferred
example of the same, and that various changes in the
shape, size and arrangement of parts may be resorted to,
without departing from the spirit of the invention or the
scope of the subjoined claim.
Having thus described our invention, we claim:
A lock device to prevent access by children to medicine
cabinets and the like, comprising a base element for at
tachment to a ?xed support near the movable edge of
a swinging medicine cabinet door, a relatively stationary
47 have no effect whatsoever upon the operation of the
head secured adjustably to the base element and position
lock and are merely a subterfuge intended to bewilder
children who may attempt to open the medicine cabinet 30 able near the outer face and said movable edge of said
door, a ‘generally rectangular swinging bolt pivoted to said
head in opposed substantially contacting relation with
the outer face of the head and being elongated and extend
ing upon opposite sides of the head and including end
tensions 39, until they are flush with the front face of 35 portions which may overlap the outer face of said door
to secure the latter, said head and bolt provided in their
the locking bar 27. This will shift the locking balls 40
opposed faces with ?rst and second diagonal pairs of
bodily into their recesses 35, and the inner ends of the
recesses adapted to register when the bolt is in overlap
plungers 38 will be flush with the meeting faces of the
ping relation to the front face of said door, a ?rst pair
locking bar and head 12. When this condition is achieved,
none of the plungers or balls are exerting any locking 40 of plungers in the ?rst diagonal pair of recesses of the
bolt and extending through the forward side of the bolt
in?uence, and the locking bar‘ 27 may be turned to the
and operable from the forward side of the bolt, resilient
vertical position shown in dotted lines in FIGURE 1
detents in the corresponding diagonal pair of recesses
to release the door 11. When the locking bar is returned
of the head normally spanning the opposed faces of the
to the horizontal position shown in full lines in FIGURE
To unlock and open the door 11, when the locking
bar 27 is in the position shown in FIGURES 2 and 3, it is
necessary to depress the two diagonally opposite pin ex
1, the locking balls 40 will automatically return to their '
active or locking positions due to reregistration of the
particular recesses 35 and 36.
Should the child depress all four of the central pin
extensions 39 and 44, which is a natural tendency, this
will not unlock the cabinet door, because the depression
of the plungers 43 will cause these plungers to enter the
recesses 35 and span the opposed faces of the locking bar
27 and head 12, and this will lock the locking bar, despite
the fact that the simultaneous depression of the plunger-s 38
will unlock the locking bar. Thus, it is possible to un
lock the cabinet door only by depressing the two di~
agonally opposite pin- extensions 39 simultaneously. De
pressing only one of the pin extensions 39 will not un
lock the cabinet door, asshould be obvious, depressing
head and bolt to lock the same against relative rotation
and released by depression of said ?rst diagonal pair of
plungers, a second pair of plungers in the second diagonal
pair of recesses of the bolt extending through and op
erable from the forward side of the bolt, second resilient
detents in the second diagonal pair of recesses of the head
normally releasing the head and bolt for relative rotation
but locking the latter when the second plungers are de
pressed, and dummy pairs of plungers in the bolt out
wardly of the diagonal pairs and in substantial lateral
alignment therewith and projecting forwardly of the bolt
near the ends of the bolt and having the same appearance
as the diagonal plungers to confuse children, the arrange
. ment being such that the bolt may be turned to cabinet
door releasing position only after simultaneous depression
one or both pin extensions 44 will not unlock the cabinet 60 of the ?rst diagonal pair of plungers of the bolt.
door, and depressing all of the pin extensions 39 and
References Cited in the ?le of this patent
44 simultaneously will not unlock the cabinet door, as
stated. The dummy pin extensions 47 vhave no effect
on the lock as previously stated.
To install the lock, the base 13 is ?rst secured to the 6
wall 10 with the screw 19. The locking bar 27 is then
tightly secured to the screw 28 after the latter is intro~
Gage ________________ __ June 13,
Robertson ____________ __ Mar. 17,
Wetherell ___________ __ Nov. 30,
Hummer _____________ __ June 30,
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