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Патент USA US2133187

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ocg. 11, 193s.
y
c. w. CHENEY
KEY FOR LOCKS
v Filed Sept. 8, 1957
>
2,133,187
Patented Oct. 11, 1938
v2,133,187
UNITED STATES
PATENT OFFICE
2,133l187
KEY Foa-_Looks _ ,
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Charles William Cheney, Soho, Birmingham, y.
England
Application september s, 1937, serial No. 162,847
aIn Great _Britain August 13, 1936
The invention relates to a lock key of thefflat
Shank type having a. ñngel‘fplece at one end and
formed from a sheet metal blank by folding the
blank longitudinally upon itself from its middle
fà
into integrally joined halves and securing the
halves together, one or both of the longitudinal
edges of the shank being provide-d with ward
engaging notches or such like.
The invention provides an improved key con
10 struction of this type, and has for its objects,
greater accuracy in formation, and increased
strength and durability at that part of the key
where these requirements are of importance, i. e.
at the shank and particularly at its end, while
15 further, a much neater appearance results.
I accomplish these objects by folding the key
from a blank having two halves each comprising
a ñnger piece portion and a shank portion, the
two shank portions of the blank being disposed
20 on a common longitudinal axis and joined in
tegrally at their free ends. In order to- secure
the two halves together, the linger piece por
tions of the two halves folded upon one another
are rigidly connected, preferably by riveting.
25
One form of the invention provides a pin pro
jection on the forward end of the shank while
another form of the invention provides a longi
tudinal tubular or pipe portion from the forward
end, being minus the pin projection. The-first
30 form is carried out by including as part of the
shaped blank a central and longitudinal web of
a less width than the shank portions.
The second form is carried out by providing a
longitudinal central ?luting on each shank por
35 tion, and by slitting said flutings at the point
where the blank is folded, so that on folding the
ilutings form the pipe or tubular portion.
The iluting may also be provided on each side
the web in the ñrst form of the invention, as it
40 materially strengthens the shank.H
The invention in its two forms is rep-resented
by the accompanying drawing, Figs. 1-4 illus
trating the first form, and Figs. 5-10 the second
form.
,
45
Fig. 1 is a side View of a ñnished key.
Fig. 2 is a section of Fig. 1 on the dotted
lines A. B.
Fig. 3 is a side view of the shaped blank be-'
fore it is folded and notched.
50
Fig. 4 is a longitudinal section of Fig. 3 upon
the dotted lines C. D.
-
'
gFig, 8 is an ,innerside View of the shaped blank
before it „is folded and notched.
v
_.
-
Fig. 9 is a longitudinal section of Fig. 8 on the
dotted lines G. H.
Fig. 10 is a, longitudinal section of Fig. 8 on 5 '
the dotted lines I. J.
Where permissible the same letters of refer
ence are used for corresponding parts of the
drawing.
,
With reference to Figs. 1-4, a shaped but un- l0
notched blank comprises similar halves to be
closely folded upon each other about the ap
proximate centre line indicated at a, each half
comprising a shank portion a2, and a finger
piece portion a3 integrally joined by the web 15
a4, which is much less in width than the width
of the shank portion.
The web a4 is so shaped as
to form the hollow projecting pin a5 when the
halves of the blank are closely folded and se
cured to each other. Longitudinally in line with 20
the web a4 and of about the same breadth, each
shank portion a2 is formed with a fluting a6
which materially strengthens the shank, these
flutings coming close together when the blank
is closely folded to form a substantial cylin- 25
drical portion as clearly shown in Figs. 1 and 2.
Each finger piece portion a3 is pierced at a1,
and the edge of one of these piercings is drawn
out to provide a small sleeve a8, as clearly shown
in Figs, 3 and 4, to enter the other piercing and 30
be riveted over, as clearly represented in Fig. 2,
for the purpose of rigidly securing the closely
folded halves to each other, it being understood
that the folding and closing of the halves is
performed by press tools, as also is the securing. 35
The second form of the invention Figs. 5-10
is without the pin projection a4, and is of a
construction known as a tubular or pipe key, _the
fluted portions a6, a6 in the shaped blank being
only separated by a slitting c which does not
extend through the whole of the middle of the
shank, as clearly represented by Figs. 8, 9 and
l0. When this blank is folded the slitting pro
vides an entrance to the tube or pipe d formed
by the combined ñutings a6, a6. Otherwise this 45
second form of the invention is substantially the
same as the ñrst form, both forms having the
same distinctive feature, viz. that the shank por
tions of the two halves are disposed in the blank
on a common longitudinal axis and are joined 50
integrally at their ends.
'I‘he word-engaging notches may be provided
Fig. 5 is a side view of a finished key.
Fig. 6 is a section of Fig. 5 on the dotted lines ` at any convenient period in the manufacture of
E. F.
the key.
.
55
Fig. 7 is an end view of Figs. 5 and 6.
It will be understood that accuracy in forma- 55
2
2,133,187
_
tion of the shank and maintenance of that ac . latter, said web, after folding of the halves upon
curacy is essential, particuarly at its end, and one another, forming a pin at the end of the
key shank.
it will be appreciated that the invention com
pletely satisfies these requirements as the halves
of the key are integrally joined up at said end,
thereby rendering separation of the shank prac
tically impossible.
_ Havingr now described my' invention, what I
claim and desire to secure by Letters Patent is: -
10
1. A lock key of the character described, formed
from a single sheet metal blank having similar
halves by folding the blank longitudinally upon
itself and securing the halves together, each of
said halves comprising a finger piece portion and
a shank portion, the shank portions of the two
halves being disposed in the blank on a common
longitudinal axis and being joined integrally at
their ends.
'
2. A lock key, as claimed in claim 1, in which
said blank comprises further a longitudinally ex
tendingweb of a width less than ~that of the
shank portions and integral with both of the
3. A lock key,'as claimed in claim 1, in which
said blank comprises further a longitudinally ex
tending web of a width less than that of the
shank portions and integral With both of the
latter, said shank portions and web being longi
tudinally fluted, whereby the fluted'tweb, after
folding of the rhalves upon one another, forms a 10
tubular closed pin at the end of the key shank.
4. A lock key, as claimed in claim 1, in which
the integral shank portions of both halves are
longitudinally ñuted intermediate their outer
edges and a transverse slit is provided between the
two halves of the blank across the fluting inter
mediate two strips of material integrally joining
the two shank portions, whereby the key shank,
after folding of the halves upon one another,
comprises a tubular portion open at the free end 20
of the shank.
CHARLES WILLIAM CHENEY.
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