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Патент USA US2404118

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y 16 i946.
'v. G. YAWMAN-
2,404,118
METHOD OF MAKING TRIGGERS
Filed May 10, 1945
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Patented July 16, 1946
¿404,1 18
UNITED STATES PATENT OFFICEv Íl
2,404,118
METHOD oF MAKING TRIGGERS
Victor G. Yawman, Rochester, N. Y., assign'or to
Yawman Metal Products, Inc., Rochester, N. Y.,
a corporation of New York
Application May 10, 1943, Serial No. 486,442
6 Claims.
l
This invention relates to a method of mak
ing triggers.
In the past, it has been the practice to make
a trigger for a Colt automatic pistol by sub
jecting a single block of metal to a series of ex
pensive and exacting machining operations to in
sure rigidity and accuracy of the ñnished prod
uct. While it has been proposed to make such
triggers by welding certain parts thereof together,
(Cl. 29-148) '
2
of the loop-like trigger extension 5" (Figs. 11 and
13). While the parts may be secured together
in any suitable manner, it is preferred to upset"
parts 6 of the ñnger portion to engage the rear
sides of the lugs 4 with their front sides in con
tact with the rear surface of the finger portion
as shown in Figs. 13 and 14.
According to the iirst step -of the present meth- '
od of making this novel trigger, the finger en
such welded construction has not been acceptable 1.0 gaging portion I thereof is stamped from sheet
owing to the fact that certain of the parts, made
metal to have the outline indicated in Fig. '1.
of thin stock, had to be welded to parts made
In the next stop, shown in Fig. 2, one surface
of necessarily thicker stock, with resulting un
of the blank I is formed with a knurled strip
satisfactory joints. Furthermore, the welding
2 extending longitudinally along a'rnedialv por
operation produced irregular surfaces which had 15 tion thereof, while the reverse side of this' blank
to be ground smooth in order to produce a satis
factory finish.
is provided with a straight, narrow depression"
8 also extending lengthwise of the blank sub
stantially -medially from one end thereof to the
In accordance with one feature of the present
invention, there is provided a trigger having a
the other.I After this step, the blank is nex't'bent
saddle-shape linger-engaging portion with a 20 into arcuate form, as shown in Fig. 3. Follow
channel at its rear to receive a loop-like exten
ing this step, the now arcuate blank is ‘bent into>
s1on.
saddle-shaped or U-shaped form about its'lon
In accordance with another feature of this in
gitudinal depression, in fact, thisl depression'iin-ß
vention there is provided a novel method ac
sure's proper bending of the blank and the‘de
cording to which a trigger is made from sheet 25 sired -?low of metal during this -forming opera
metalv parts by a series of blanking and form
tion. It will be noted that as a Vresult of this.
ing operations followed by the assembly and stak
forming operation, the blank now is provided at
ing of the parts together to produce a. trigger
each end thereof, with a pair of ears 9, resulting;
unit having all the strength and accuracy of a
from the excess material found desirable in hold-trigger machined from a single block of metal. 30 ing the arcuate blank during this last-mentioned
In the drawing:
v forming operation. However, in the finished trig
Figs. 1 to 6 inclusive show the successive steps
ger, these ears are unnecessary and consequent
of making the linger engaging portion of a trig
ly the saddle-shaped blank is subjected to a
ger from a blank of material, Fig. 5 being a sec
broaching operation which removes them and
tion taken on the line 5-5 of Fig. 4;
35 provides both ends of the formed blank with
Figs. 7, 8 and 9 show successive steps in the
straight, parallel surfaces I0. The blank thus
blanking and forming of the trigger extension;
formed may be subjected to the usual finishing
Figs. 10 and 11 are respectively a side view and
operations to remove burrs and the like.
a top view showing the shape of the trigger ex
The extension of the trigger 5 is stamped from
tension after the final forming operation;
40 sheet metal to provide a blank, comprising a
Fig. 12 shows the linger engaging portion and
band terminating at each of its ends in a pair
the trigger extension assembled together ready
of oppositely extending lugs 4, as illustrated in
for the staking operation;
Fig. 7. The extension blank is next formed into
Fig. 13 is a side elevation of the ñnished trig
the Shape illustrated in Figs. 8 and 9 wherein
ger after the staking operation; and
45 the lug portions 4 thereof are bent into parallel
Fig. 14 is a sectional view taken on the line
olf-set relation with respect to the main part
I4-I4 of Fig. 13, particularly showing how the
of the blank, being connected thereto through
staking serves to hold the parts of the trigger
curved portions II. In the next forming opera
in assembled relation.
tion, the blank thus far formed is bent sharply
The trigger of the present invention comprises 50 on the diagonal lines I2 to provide the loop-like
a saddle-shaped, finger-engaging portion I, with
portion with the two pairs of' lugs 4 positioned
a knurled front 2, with a rear channel 3 extend
side by side, as shown in Figs. 10 and 11.
ing from the top to the bottom thereof. This
In assembling the two parts of the trigger
channel has mounted therein the pairs of oppo
unit together, the pairs of lugs 4 of the exten
sltely extending lugs 4 on the registering ends 55 sion are forced into the channel space 3 in the
2,404,118
3
finger-engaging portion, in the position shown in
Fig. l2. When thus assembled, the parts are
staked together in a suitable press by having
portions 6 of the finger portion upset behind the
mentioned lugs. Any excess metal may be
trimmed away and the parts may be suitably fin
ished in accordance with the Well-known practice.
From the foregoing, it will be seen that this
invention provides a novel trigger construction
and a novel method of manufacturing the same
wherein a minimum amount of metal stock is re
quired and wherein a novel series of inexpensive
blankîng and forming operations suñ‘ice.
This
novel method thereby obviates the need of ina
chining operations by skilled operators and great
ly reduces the time required as Well as the cost
of producing triggers.
What I claim is:
1. The method of making a trigger which com
prises punching an elongated ñnger hold blank
from sheet metal, forming said blank into a sad
dle shape to provide a rearwardly opening chan
nel, stamping a trigger extension blank from
sheet metal, forming said extension blank into
a loop with its ends in registering relation, and
staking the registering ends of said loop in said
channel with the principal plane of the loop ex
tending at right angles to the principal axis of
said ñnger hold blank.
ger extension blank from sheet metal, forming
said extension blank into a loop with each of its
ends provided with a pair of oppositely directed
lugs, said pairs of lugs being positioned in reg
istry, and finally securing said lugs in the chan
nel opening of Said finger hold blank.
4. The method of making a trigger which
comprises punching a, ñnger hold blank having
a main axis and a short axis, knurling a medial
strip on one surface of said blank along the inain
axis thereof, forming a long narrow depression
in the other surface of said blank along the main
axis thereof, bending the blank into arcuate
shape around its short axis, bending the arcuate
blank about said depression into U-shaped form
with said knurled strip exposed, stamping a trig
ger extension blank from sheet metal, forming
said extension blank into a loop With each of its
ends provided with a pair of oppositely directed
lugs, said parts of lugs being positioned in reg
istry, and finally staking said lugs in the chan
nel opening of said finger hold blank.
5. The method of making a trigger which com
prises punching an elongated ñnger hold blank
25 from sheet metal, folding said blank lengthwise
to provide a longitudinal channel, stamping a
trigger extension blank from sheet metal, form
ing said extension blank into a loop with its ends
in registering relation, and staking parts of said
2. The method of making a trigger which com 30 folded finger hold blank about portions of the
prises punching a ñnger hold blank having a
registering ends of the loop to hold said loop
in said channel with the principal axis of the
long and a short axis, bending the blank into
loop extending at right angles to the principal
arcuate form about its short axis, bending the
axis of said finger hold member.
arcuate blank about its long axis .to provide a
6. The method of making a trigger which com
rearwardly opening channel, stamping a trig~
prises punching from sheet metal, an elongated
ger extension blank from sheet metal, forming
finger hold blank with excess end portions, fold
said extension blank into a loop with its ends
ing said blank lengthwise -to provide a longitudi-`
in registry, and finally securing the registering
nal channel, removing said end portions to pro
ends of said loop in said channel with said loop
vide substantially parallel end surfaces on said
at substantially` right angles to the long axis of
finger hold, stamping a trigger extension blank
said finger hold blank.
3. lThe method of making a, trigger which
from sheet metal, forming said extension blank
comprises punching a ñnger hold blank having
into a loop with its ends in registering relation,
and staking parts of said folded ñnger hold blank
a main axis and a short axis, knurling a medial
about portions of the registering ends of the loop
strip on one surface of said blank along the main
to hold said loop in said channel with the prin
axis thereof, bending the blank into arcuate
cipal plane of the loop extending at right angles
shape around its short axis, bending the arcuate
to the principal axis of said finger hold.
blank` about its long axis into U-shaped form
VICTOR G. YAWMAN.
with said knurled strip exposed, stamping a trig
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