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Патент USA US2105590

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Jan. 18, 1938.
Filed March 19, 1936
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2 Sheets-Sheet 1
Jan.'l8, 1938.
Filed March 19, 1936
2 Sheets-Sheet 2
J5 17 19
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Patented Jan. 18, 1938
Morris H. Efsten, Fitchburg, Mass, assignor to
Independent Lock Company, Fitchburg, Mass,
a corporation of Massachusetts
Application March 19, 1936, Serial No. 69,656
3 Claims. (01. 70-57)
This invention relates to a device for locking
diametrically opposite points to receive the bolts
doors, the covers of a book, as for example a
which ?t it accurately. In Fig. 5 is shown the
ledger, or to serve as a substitute for a padlock,
position in which the ledger is unlocked and the
covers can be removed. To look the ledger, the
The principal objects of the invention are to two bolts are moved toward each other so that
provide a lock with one or more inserted headed
the two heads !2 contact, or nearly contact, with
bolts which, when pushed into the proper place, each
other as shown in Fig. 4.
can be simultaneously locked in place by the
The cylinder l3 includes a plug I4 which is
turning of the lock plug through any desired arc provided with a projecting tumbler l5 operating
to prevent the bolt or bolts from being moved; to
in a groove H5 in the inside of the cylinder. At 10
provide a construction in which the ledger or door
one end it is connected with a longitudinal slot i1
cannot be opened except by the party who has the extending along the cylinder. The plug is pro
proper key, and to provide a construction in which
vided with the usual tumblers H) which are
the lock can be unlocked simply by inserting the
adapted to be manipulated by a key 20 as shown
key and turning it a quarter turn, for example, in Fig. '7. This key, when inserted, will move
thus releasing the bolt or bolts.
these tumblers to withdraw them so that the plug
Other objects and advantages of the invention can be turned by the key and at the same time the
will appear hereinafter.
tumbler l5 will be turned with it in the groove l6,
Reference is to be had to the accompanying thus preventing the removal of the plug. The
20 drawings, in which
key and plug are turned only a quarter of a
Fig. l is a sectional view of the two covers of a
ledger showing the locking bolts and a preferred
form of the lock in position holding them locked;
Fig. 2 is an end view of the look as indicated by
25 the arrow 2 in Fig. 1;
Fig. 3 is an opposite end view of the look as
indicated by the arrow 3 in Fig. 1;
Fig. 4 is a sectional view of the
the bolts in locked position;
lock, showing
Fig. 5 is a similar view showing the bolts in
unlocked position;
Fig. 6 is a longitudinal central sectional view of
the lock showing it vin locked position with the
key removed;
Fig. 7 is a similar sectional view showing the
unit in locked position with the key inserted so
that it is ready to be unlocked by a quarter revo
lution of the key;
Fig. 8 is a sectional view on the line 8—8 of
Fig. 6;
Fig. 9 is a similar View slightly at one side
Fig. 10 is a, face view of the end of the lock plug;
Fig. 11 is a side view of the plug holding tum
bler, and
' ,
Fig. 12 is an edge View thereof.
In the form- shown two ledger covers II] are
illustrated each having an opening therethrough
through which extends a locking bolt I I. The
50 two locking bolt's substantially meet at the center
of the ledger and each is provided on the end with
a cylindrical head l2. The ledger can be locked
when these two heads are pushed into contact
with each other. The two bolts support from the
55 cover It a lock cylinder 13 which is perforated at
revolution preferably.
The plug is provided with ~
two projections 2| spaced apart which, as shown
in Fig. 4, will move around opposite sides of the
two heads l2 and hold the bolts ll locked to
gether as shown in Fig. 4. These projections 2|
can be used for looking a single bolt and head,
evidently. The key at this point can be removed
and the lock can be unlocked again by inserting
the key and turning it back a quarter of a revolu
tion. This, as shown in Fig. 5, releases the heads
l2 and allows the bolts to be drawn away from
each other allowing the ledger, door, or the like,
to be opened.
This constitutes a very simple Way of looking a
book, employing only one look and one key, the 3
look being located in a place in the book where it
is not objectionable and is an improved feature
of the book when the lock is used for that pur
Having thus described my invention and the us
advantages thereof, I do not wish to be limited to
the details herein disclosed, otherwise than as set
forth in the claims, but what I claim is:—
l. The combination of two bolts in axial align
ment, and each having a transverse head at the
inner end in axial alignment with the bolts, the
bolts being movable to place the heads in position
for enabling the bolts to be locked together, and
a lock having means for locking said heads in
contact with each other.
2. The combination of two bolts projecting
oppositely, and a cylindrical head on the inner
end of each bolt, of a lock cylinder into which
said bolts are projectible, a plug in the cylinder
having two projections substantially engaging >
said heads to lock the bolts from movement, said
plug being adapted to turn on its axis to bring
said projections into either looking or unlocking
position, and. means for holding the plug in the
cylinder when locked.
3. The combination with two bolts secured one
to each of two opposed covers, each bolt project
ing inwardly from its cover and adapted to sub
stantially meet midway between said covers, and
a head on the inner end of each bolt, of a lock
cylinder into which said two bolts are projectible,
and a plug in the cylinder having two projections
substantially engageable with said heads to lock 5
them together or to release them.
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