Rifle Bolt Page: 4 of 5
[2], 3 p. : ill. ; 23 cm.View a full description of this patent.
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1,305,830
grooves intercept an annular groove 17a in
the inner face of the bolt, whereby when the
firing head is revolved it is locked to the bolt.
The firing pin lar 18 is provided at its
5 forward end with a collar 19 beyond which
projects a flat member 20 .which is .adapted
to fit singly between the arms 13 14 of the
bolt head, the forward end portion of the
member or head 20 being provided with an
10 undercut groove 21 into which the striker or
firing pin.22 is adapted to be secured. The
striker- is provided with a reduced central
portion -23 and a head 24, said head engag-
ing the undercut portion of the groove 21
15 whereby-the striker is firmly, but readily de-
tachably, secured to the firing pin bar 18.
It will be noted that by my invention I am
enabled to materially reduce the length of
the striker. The rear end of the striker bar
20 is flattened on two of its sides and is pro-
vided with two pairs of oppositely disposed
lugs 25.
The cocking sleeve 26 is adapted to have
a neat sliding fit on the reduced. portion 5
25 of the bolt and is revolubly mounted there-
on, the firing pin bar 18 extending rear-
wardly beyond the cocking sleeve; said fir-
ing pin bar being secured to the cocking
sleeve by means of the cocking piece 126'
30 which is provided with a forwardly extend-
ing arm 28 having a lug 29 which lug enters
a groove 30 in the cocking sleeve. The cock-
ing sleeve has a forwardly extending cam
lip 26a which cooperates with the handle 4
35 to move the sleeve rearwardly. The cocking
piece 26b has an elongated opening 31 in
which are lugs 32 adapted to interlock with
the lugs 25 on the firing pin bar whereby
these two parts are 'secured together. The
40 cocking sleeve 26 is provided with longitudi-
nally extending grooves 33, 34 and a lug 35
positioned between said grooves said lug co-
operating -with the sear nose. A safety 36
is mounted on the cocking sleeve and is pro-
45 vided with an arm 37 having cams which
are adapted to engage the recesses 7 on the
bolt to lock the bolt. The main spring 39 is
mounted in the bolt and disposed around the
firing pin bar 18.
so The bolt 1 moves backward and forward
and revolves in the rifle receiverA, carry-
ing a cartridge from the magazine or one
placed by hand in front of it, and places same
in the rifle barrel or chamber. when shoved
55 forward, and supports the head when fired;
At the time that the cartridge is placed in
the rifle chamber the hook of the extractor
15 catches in the cartridge groove, and holds
the shell until it is ejected. The cocking
60 piece 26b unites the parts of the bolt mecha-
nism by a simple tongue and groove ar-
rangement. The cocking piece 26" also en-
gages and holds the firing pin bar 18 by a
tongue and groove arrangement. The ar-
66 rangement permits of the bolt being easilytaken apart by a slight turn of the cocking
piece for cleaning, oiling, etc., without re-
moving the main bolt casing 1 from the rifle
receiver on the rifle. The safety 36 when
turned to the left permits the operation of 70
the bolt and other parts for loading and fir-
ing, ejecting the shell, etc., or when turned
to the right locks the bolt by engaging the'
lugs as shown on horizontal arm 37 in
grooves 7. The safety when turned to the 75
right also prevents the rifle from being fired
when the bolt is cocked. The lugs 2 and 3
serve to lock and' hold the bolt in grooves
in the bolt receiver when being fired, and
may be termed locking lugs. so
The lugs 16 of bolt bar head 9, hold the
main spring 39 in place within the bolt by
interlocking with grooves 17 in bolt casing,
when cocking piece 26b, cocking sleeve 26
and safety 36 are removed from the bolt for 85
cleaning, oiling, etc. Main spring 39 and
firing pin bar 18 together with striker pin
can be removed from main bolt casing for
cleaning, oiling, etc., by a slight turn of
bolt bar head 9 which disengages lugs 16 on so
same from inner grooves 17 in main bolt
casing.
To open the bolt, raise the handle 4 until it
comes in contact with the left side of the re-
ceiver A and pull directly to the rear. Rais- 95
ing the handle rotates the bolt and separates
the locking lugs from their locking shoul-
ders in-the receiver, with which they have
been brought in close contact by the power
pressure. This rotation causes the cocking 100
cam of the bolt to force the firing pin to the
rear, drawing the point of the striker into
the bolt, rotation of the firing pin being pre-
vented by the lug on the cocking piece pro-
jecting, through the sleeve, into its groove in lo5
the receiver. As the sleeve remains longi-
tudinally stationary with reference to the
bolt, this rearward motion of the firing pin,
and consequently of the striker, will start
compression of the main spring 39, since the 110
rear end of the latter bears against the front
end of the barrel of the sleeve and its front
end against the collar 19 of the firing'pin.
During the rotation of the bolt a rear mo-
tion has been imparted to it by the usual ex- 115
tracting cam, coming in contact with the
usual extracting cam of the receiver, so that
the cartridge case will be started from the
chamber.
The bolt is then drawn directly to the rear, 120
the parts being retained in position by the
cocking piece nose remaining in the cocking
notch and locked by the sleeve lock engaging
its notch in the bolt.
The position then occupied by the parts 125
is shown in Fig. 4, and the piece is ready to
fire.
To pull the trigger, the finger piece must
be drawn to the rear until the contact with
the receiver is transferred from its bar to is2
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Reference the current page of this Patent.
Mudd, Thomas, O. Rifle Bolt, patent, October 2, 1916; Washington D.C.. (https://texashistory.unt.edu/ark:/67531/metapth1259390/m1/4/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.