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Патент USA US2126391

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Aug. 9, 1938. '
E. N. JACOB]
2,126,391
LOCK
Filed’ May 10, 1957
2 Sheets-sheaf: 1
Edward N. Jami”
Aug. 9, 1938.
_
E, N, JACQBI
LOCK
‘
>
2,126,391 -
'
Filed May 10, 1937
‘
2 Sheets-Sheet 2
63m?
Edward N
m
‘
2,126,391
Patented Aug. 9, 1938
UNITED STATES PATENT OFFICE
2,126,391
LOCK
Edward N. Jacobi, Milwaukee, Wis., assignor to
Briggs & Stratton Corporation, Milwaukee,
Wis., a corporation of Delaware
Application May 10, 1937, Serial No. 141,713
4 Claims. (Cl. 70-417)
This invention relates to improvements in locks parts thereof being broken away and in section;
' Figure 2 is a front end view of this look with a
and refers particularly to pin tumbler locks.
In certain types of pin tumbler locks, it is
customary to assemble the cylinder with the cas~
5 ing from the rear. As a result, the joint be
tween the cylinder and its casing is exposed at
the cylinder;
the front end of the look so that it is possible to
insert a thin feeler between the cylinder and the
wall of the bore to hold a su?icient number of
Figure 4 is a view similar to Figure 1, illustrat
ing a slightly modi?ed embodiment of the inven
tumblers in their inoperative positions (to which
they have been actuated by a picking tool) to
permit the lock to be forced.
It is therefore an object of this invention to
provide means for guarding the joint between
the cylinder and the casing bore at its front end
to preclude the insertion of a feeler.
It is also customaryin locks of this type to pro
vide ‘the desired ?nish for the front end of the
look by directly plating the die-cast cylinder and
easing. Plating the lock parts in this manner
does not permit the best treatment of the die
castings for corrosive resistance.
t is therefore a further object of this inven
tion to provide the desired bright ?nish for the
front end of the look by means of separate caps
covering both the front of the cylinder and the
front of the casing so as to permit treating the
zinc alloy die castings by the best process for cor
rosive resistance.
Another object of this invention is to so de
30
sign these caps which provide the desired bright
?nish for the front end of the look as to also
tion;
Figure 5 is a perspective view of the cylinder 10
cap and the front end of the cylinder of the lock
shown in Figure 4;
Figure 6 is a View similar to Figure 1, illustrat
ing another modi?ed embodiment of the inven
tion;
15
Figure 7 is a front View of the lock shown in
Figure 6; and
Figure 8 is a perspective View of the cylinder
cap and the front end of the cylinder of the lock
shown in Figure 6.
Referring now particularly to the accompany
ing drawings in which like numerals indicate
like parts throughout the several views, the nu
meral 5 designates the casing of a pin tumbler
lock which is bored as at 6 to receive a lock cyl
inder l. The lock is of the type wherein the
cylinder is inserted into the bore 6 from its rear
end and means (not shown) are provided for
securing thecylinder in the casing.
The cylinder is provided with the customary .1
pin tumblers 8 (only one being shown) yieldingly
urged into the cylinder by spring pressed drivers
protect the joint between the cylinder and the
9 mounted in the casing. The inner ends of the
casing bore against the insertion of a thin feeler.
tumblers 8 extend into a keyway I!) to be accessi
ble to a key insertable into the keyway by which
the tumblers are lifted to bring the junction of
their outer ends and the drivers 9 in line with
A further object of this invention is to provide
simple and e?icient means for retaining the caps
in position, which is so constructed that the caps
may be readily applied after the cylinder and
the joint between the cylinder and the casing
easing are assembled.
With the above and other objects in view
which will appear as the description proceeds,
this invention resides in the novel construction,
bore.
To protect the front end of the joint between .V
combination and arrangement of parts substan
tially as hereinafter described and more particu
larly de?ned by the appended claims, it being un
derstood that such changes in the precise em
bodiment of the hereindisclosed invention may be
made as come within the scope of the claims.
it)
portion thereof broken away;
Figure 3 is a perspective view showing the inner
face of the cylinder cap and the outer end of
The accompanying drawings illustrate several
complete examples of the physical embodiment of
the invention constructed in accordance with the
best modes so far devised for the practical appli
cation of the principles thereof, and in which:
Figure 1 is a side view of the front end portion
of a lock embodying one form of this invention,
the cylinder and the casing bore and preclude the
possibility of inserting a feeler between these
parts for the purpose of retaining the tumblers
in inoperative positions after they have been
picked, the front end of the cylinder is covered
by a sheet metal cap II which has a ?ange 12
extending out over the joint. ‘To accommodate
the flange, the front end of the bore 6 is counter
bored as at 13.
As best shown in Figure 3, the mouth of the .
keyway it extends substantially entirely across
the diameter of the cylinder and is of a size to
receive an inward protrusion 14 formed on the
cap 1 l. Theiprotrusion I4 is struck from the cap,
as shown, and fits snugly within the mouth of the 55
2
2,126,891
keyway so as to secure the cap against relative
rotation with respect to the cylinder and at all
times maintain its key opening IS in proper align
ment with the mouth of the keyway.
Assembly of the cap H and the cylinder is ef
fected by merely slipping the cap onto the front
end of the cylinder. It is held in position against
detachment by a ring-like cap l6 secured over
the front end of the casing 5. The cap I6 has a
10 hole I‘! approximately the diameter of the bore 6
so that the ?ange l2 of the cylinder cap is con—
?ned beneath the inner peripheral edge portion
of the cap IS.
The cap [6 is shaped to conform to the con
?guration of the front end of the casing and is
secured in place by having its outer peripheral
portion l8 ?tted tightly about a rim I9 formed
at the front end of the casing.
The cap I6 is
thus securely fastened to the casing and by ex
tending over the ?ange [2 of the cylinder cap
serves to hold the same in position.
Inasmuch as it is desirable to have a bright
polished ?nish for the front end of the cylinder,
the caps H and 16 are suitably plated and pol
ished prior to their application to the cylinder
and casing. In this manner, the desired ?nish is
obtained for the front end of the look without
necessitating plating the die-cast parts, thus al
lowing the most approved process to be em
ment of the cap 4|. The casing cap 4| conforms
to the non-circular cross sectional shape of the
casing and is ?tted snugly thereover and se
cured in position by having a portion of its rear
edge engage down into a recess 42 in the casing, an
as shown in Figure 6.
From the foregoing description taken in con
nection with the accompanying drawings, it will
be readily apparent to those skilled in the art,
that this invention provides. simple means for
protecting pin tumbler locks of the character
described against picking by the insertion of a
thin feeler between the cylinder and. casing bore,
and that the same means which is used to pro
vide this protection also serves as a ?nish for
the front end of the lock leaving the die-cast
parts thereof free to be treated in the most desir
able
and
approved
manner
for
corrosion
resistance.
What I claim as my invention is:
1. In a lock: a bored casing having a counter
bore; a cylinder mounted in the bore with one
end projecting into the counterbore; a cap over
lying said end of the cylinder with its peripheral
portion extending therebeyond, said end of the
cylinder being spaced from the bottom of the
counterbore so that the peripheral portion of the
cap is held from contact with the casing; coop
erating means on the cylinder and the cap to
ployed for protecting the die castings against
corrosion.
secure against relative rotation therebetween; 30
‘ In the embodiment of the invention illustrated
end. of the casing with its inner peripheral por
tion pressing against the front of the cylinder cap
to hold the same in ?rm engagement therewith
and secure the cylinder against outward endwise
movement.
in Figures 4 and 5, the cylinder cap 20 consists
of a dished plate to be ?tted over the front end
of the cylinder and having a rectangular opening
2| for alignment with the mouth of the keyway
22.
The cap is held against rotation on the
cylinder by two rearwardly directed tangs 23
which engage in notches or recesses 24 in oppo
site sides of the cylinder.
As in the embodiment previously described,
the front end of the casing bore is counterbored
as at 25 to receive the outer edge portion of the
cap 20 which is of larger diameter than the cylin
der so as to cover the joint between the cylinder
and the casing bore. The cylinder cap is re
tained in position by a cap 26 which covers the
front end of the cylinder to which it is securely
fastened by having its peripheral portion 21
formed about an annular ?ange 28.
At its center, the cap 26 has ahole provided
with an inwardly directed ?ange 29 to engage
the face of the cap 20 and hold the same in place.
In the embodiment of the invention illustrated
in Figures 6, '7 and 8, the lock casing 30 is non
circular in cross section, but in other respects is
like that shown in Figure 1 and is bored to re
ceive a cylinder 3|, the front end of the bore
being counterbored as at 32. In this instance,
the cylinder cap 33 is substantially a shallow cup
with a peripheral ?ange 34 extending rearwardly
therefrom to engage over the front end portion
of the cylinder. A transverse substantially rec
tangular opening 35 in the face of the cap 33
‘ provides a passage for the key in alignment with
the mouth of the keyway 36, and rearwardly
extending lugs or ears 3'! on the margins of the
opening 35 engage in recessed portions 38 at the
mouth of the keyway to secure the cap against
rotation with respect to the cylinder.
As best shown in Figure 6, the outer surface of
the annular ?ange 34 is stepped to provide a
ledge 39 which engages in back of the edge of a
hole 40 in the casing cap 4|. In this manner,
75 the cylinder cap is retained in place upon secure
and a ring-like cap secured over the adjacent
2. In a lock: a bored casing having a counter
bore; a cylinder mounted in the bore with one
end projecting into the counterbore; a cap over
lying said end of the cylinder with its peripheral 40
portion extending therebeyond, said end of the
cylinder being spaced from the bottom of the
counterbore so that the peripheral portion of the
cap is held from contact with the casing; coop
crating means on the cylinder and the cap to
secure against relative rotation therebetween;
and a ring-like cap of thin spring-like stock se
cured over the adjacent end of the casing with
its inner peripheral portion pressing against the
front of the cylinder cap to yieldingly hold the
cylinder cap against the cylinder and urge the
cylinder in one endwise direction.
3. In a look: a casing having a bore; a cylin
der mounted therein and having diametrically
opposite longitudinally extending grooves in its ,7;
outer surface; a cap covering the front end of the
cylinder with its peripheral portion extending
out over the joint between the cylinder and the
casing bore to prevent the insertion of a tool
therebetween; cooperating means on the cylinder (3 O
and cap for securing said cap against relative
rotation includingr rearwardly directed diametri
cally opposite tangs formed on the peripheral
portion of the cylinder cap and closely ?tted into
said diametrically opposite grooves in the outer
surface of the cylinder; and a ring-like cap se
cured over the front end of the casing with its
inner peripheral portion overlapping the cylin
der cap to hold the same in place.
4. In a lock: a casing having a bore; a cylinder
mounted therein and having diametrically oppo
site longitudinally extending grooves of different
size in its outer cylindrical surface; a cap cover
ing the front end of the cylinder with its periph
eral portion extending out over the joint between 75
2,126,391
the cylinder and the casing bore to prevent the
insertion of a tool therebetween; a nonrotatable
connection between said cap and the cylinder
comprising, a tang projecting rearwardly from
the peripheral portion of said cap and of a size
to be closely ?tted into the larger of said cylinder
grooves, and another tang smaller than said ?rst
named tang projecting rearwardly from the pe
3
ripheral portion of said cap at a point diametri
cally opposite said ?rst named tang and adapted
to be closely ?tted into the smaller of said cylin
der grooves; and a ring-like cap secured over the
front end of the casing with its inner peripheral
portion overlapping the cylinder cap to hold the
same in place.
EDWARD N. JACOBI.
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