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Патент USA US3074080

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original `Fi1ed Aug. 21. 1957
5g.' 2
/n ven for:
United States Patent O-
Patented Jan. 2_2,
vwhich >serves as guide to the pin, _as well as lgas-proof
Alfred Wolf, Basel, Switzerland, assigner to Societe de
Prospection d’lnventions Techniques Spit, Bourg-Les
tightening of this part of _the -block against the wall 0f
the bore.
Valence (Drome), France, a corporation of France
Original application Aug. 21, 1957, Ser. No. 679,450.
should act only as Va ,cartridge holder, since there _is no
1130i§ideg and this application Mar. 6, ‘1961, Ser. No.
»Claims priority, application Switzerland Aug. 25, 1956
axial cavity
why the
of the
rear could
part ofthe
not beblock,
obturated by the part supporting .the primer. However,
2 Claims. (Cl. 1--44.5)
This application is a divisional Vapplication of applica
vtion Serial No. 679,450 ñled August 2l, 1957.
`It vis not absolutely vnecessary that the charge _should
be contained in a cartridge, _and therefore that the block
10 even if a cartridge iS used, _n0 trouble can occur when
the case of the Vcartridge is ejected, _since the cartridge
holding block is used only once, and the _fresh annnuni
tion which replaces it is in the form ofanother cartridge
VIt is well known practice to use a pin designed to be
driven, under the action of a gas-pressure, into hard
ready >for use and -lodgedin such a-bloek.
material (such as wood, cement, concrete, etc), anda 15 The said block maybe made of _any distortable ,mate
liringapparatus to do so, the barrel _of which, at the rear
rial answering to requirements, preferably, of course,
end of the bore, is joined, through a shoulder, .to a load~
some cheap ,andeasily workable material; Ílfhe'power of
ing chamber which is, on the rear, obturated by a cap
explosion to which the'block is submitted 'being rather
which comprises a guide for the `tiring pin ofthe pro
high, there is no need of imposing _high _distortabilitychar
pulsive charge which is to ñre the pin.
20 acteristics, _so Jthat ,the block may be _made of material
`In known >devices of this type, there is, in the loading
neither particularly elastic nor adhesive, ‘s_uçh _as _ar_e,_for
chamber, a cylindrically shapedcartridge holder, in the
instance, the known polyamides.` jFor example, l_hard
axial hole of which'the cartridge is engaged. After each
rubber may be used, or various synthetic products, _par
liring, the cap is removed and the cartridge holder is
synthetic resins (cellulose acetate).
taken out of the loading chamber, and thecartridge case 25 lOn-the annexed drawing, vsome examples of _embodi
is ejected out of the holder, by means of a rod acting
ment Vof the invention aredisclosed,
from the front.
However, such ejection of the cartridge clases often
being ready'for tiring.
results in difficulties, because, if the cartridge holder is
FIG. -2 is a-view similar t_o_ the ñrst one, disclosing the
>not perfectly clean, the case jams, due to the action of the 30 various parts after tiring.
explosion> pressure.
Even when the cartridge'holder ismade of appropriate
embodiments of themammunitivon holdingvblock.'
" _l
steel, di?iiculties appear after a rather short use, and lead
In FIG; l, the ~`firing device comprises a b_arrel Í1, the
to trouble in service. On the other hand, ,whenthe pin
of which ‘has a cylindrical widening 2, behind
is fired, a part of the exploding gases escape through lthe 35 which is situated the cylindrical-loading chamber 3. The
space between the cartridge holder and the loadingy cham
`latter is providedyin apart of the-body 4 of -the ñring
ber, and reach the spacesituated behind the cap of the
device, this part having, atpits rear end, _a threadupón
`tiring device. Aside -from the dirtying of parts which
which is «screwed an obturating cap Sprovided with cor~
thus occurs, and which leads to trouble in use, the result
responding threads. This part has an 'axialfhole in which
ing loss of pressure in 'the barrel lowers the power >of 40 4is guidedtheliring pin 6. rI'he rear vend of the liiringpin
ejection ofthe pin from the barrel. Similar insu?'iciencies
result from the loss of gases which, in known devices,
occurs as a part of the gasesrpasses between the wall of
the bore and the pin. The total lossof gases, at rear
andfront, is such thatthe pin is _driven into the material 45
(which it has to penetrate) with a power considerably
and undeterminably lower than its pre-determined value.
The object of the present invention is to obviate to the
above drawbacks. It covers,«on,the one hand, a pin
«6 protrudes-frorn the obturating capS, andris subjected
to the action of a known device; herein not represented,
¿by -means of whichl the firing pin is driven__forwar_d when
`-the shot-»is tired.
»In the .ñring position disclosed `in FIG. "1, thepin-H, _of
l:1t-conventional type, isin axial positionfinthe rear part
fof the- borel'S. "It 4is held,iat its- rear endyby abloclcgB >of
`>distortab'le.materialpthe front part:.9 .of which, presents .a
vrguidinglsurface :10 corresponding»totheacalibre ofthe
ammunìtion unit, in which the pin is designed to be driven, 50 bore and serving as lcentering, means. -Therear part 11,-1
under gas pressure, into hard materials,` and, on the other
hand, Aa device _ofi_theabovementioned type, ìforfíiring
such pins, said unit being characterized by the fact that
it comprises a block made of distortable material, having,
_ of the` block is ,shaped to correspond .to -thecontour .of the
loading chamber 3. Therefore, it has, in impart adjacent
to the front part 9, an annular surface in close contact
with the shoulder 12 through which the barrel is join
ing, towards the rear end of the bore 8, with the cylin
shape of the loading chamber, an annular shoulder de
drical wall of the chamber 3. In the rear part 11 is, more
signed to come into contact with the shoulder of the
over, provided a central cylindrical cavity 13, which
rear end of the barrel, and an axial cavity designed to
opens to the rear. In this cavity, which is substantially
receive the propulsive charge, which is closed at the rear
level with the shoulder 12, is lodged a cartridge 14 which
by the holder of the primer, and on the other hand, a 60 contains the charge of powder dosed in a convenient way,
front part forming a wad, comprising a guiding surface
the bottom of the cartridge 14 containing the primer,
which corresponds to the bore of the barrel and presents,
being placed in the cavity and obturating it towards the
towards the front, a lodging into which is forced the rear
on the one hand, a rear part shaped to correspond to the
end of the pin, to which the said front part serves as
centering means, the bottom of the axial cavity being level
with the shoulder, in such a way that the pressure of the
The barrel 1 is mounted in such a way that, after re
moval of the cap 5, it can be axially slided through the
chamber 3, driving positively the block, while it cannot
'slide towards the front, this being prevented by shoulder
one hand, under the action of expansion, a gas-tight
15 of the body 4, the front face ofthe widening 2 bearing
closing of the rear part of block against the wall of the
70 against said shoulder 15.
loading chamber and, on the other hand, the shearing,
The front part 9 of the block B is designed to constitute
driving back, and expulsion of the front part of the block
an axial projection of the rear part 11, this projection
gases produced by ignition of the charge, entails, on the
having a cylindrical recess 16, open towards the front,
in which is engaged the rear end of the pin 7, which is
threaded. Said recess may be provided with a thread cor
responding to that of the pin, so that the pin maybe
screwed onto it and unscrewed. However, practically, it
is sufficient to give to this recess 16 the shape of a cylin
drical hole, or of a slightly truncated cone, in which the
rear yend of the pin may be engaged. Further, of course,
After the barrel has been pushed forward, a new pin
with a loaded block has been pushed in the loading cham
ber, and the cap 5 has been screwed on, the device is
ready for another shot.
The embodiment of the block shown in FIG. 3 differs
from that shown in FIG. l only by the fact that the charge
of powder 2% is directly in the cavity of the rear part 11
of the bloc-k B, and that this cavity is closed by a disc 21
provided with the primer, the edge 22 of this disc being
»the rear end of the pin may be embedded in part 9.
When the shot is tired, by driving forward the tiring 10 lforced into an annular groove provided close t-o the edge
of the cavity, in the Wall of the latter. The disc 21 has,
pin 6, the pressure produced in the cartridge 14, which
consequently, the same function as the bottom of the
propagates in the cavity 13, and which is rather high, re
cartridge, in the embodiment shown in FIG. 1, which
sults, as shown in FIG. 2, in a barrel shape swelling of
bottom, in as much as itacts as support for the primer,
the wall 17 of the cartridge and of the rear part 11 of
«the block B, until close contact is obtained with the wall 15 obturates the rear part of the cavity.
The embodiment of the block shown in FIG. 4 differs
of the chamber 3, this contact being close enough to be
from that of FIG. 1 only bythe fact that the rear part 11a
gas-tight. Moreover, the gas pressure produces a sudden
of the block Ba has the shape of a truncated cone 23,
separation of the front part..9 from the rear part 11 of
the narrow part of which is directed towards the front.
the block, in the point of the lesser resistance, as it is in
this case, the wall of the loading chamber provided
dicated by the breaking surface 1-8 shown in FIG. 2. This
in the body 4, must have a corresponding truncated cone
is accompanied by the expulsion of the front part 9
shape. This truncated cone presents, however, at the
which guides the pin. Said front part 9, expands, due to
where it is joined with the front part 9, also an
the inertia, until it is gas-tightly pressed against the wall
annular surface 24, which, when the device is loaded,
of the bore ~8, forming thus a wad. The cavity 19 which
receives the gases produced by the explosion, behind the 25 comes into contact with the shoulder through which the
barrel, at the rear end of the bore, is joined with the load
front part'y 9 of the block B, is thus hermetically ob
ing chamber. This shoulder is, then, because of its conical
turated, towards the front as well as towards the rear,
shape, smaller than the shoulder 12 of the embodiment
so that, without any loss of pressure, the whole volume
shown in FIG. 1.
of gas produced by explosion can act upon the pin and
What I claim is:
drive it with a well determined force out of the barrel. 30
1. In a ñring device for driving pins into hard mate
The recoil produced by the expulsion of the pin 7 with
rial under gas pressure comprising a body provided with
the front part 9 of block B is transmitted to the tiring
a bore, said body being provided at the rear end with a
device, being however, distributed, for the main part, di
cavity coaxial with said bore, said bore opening into said
rectly over the body 4, with a frictionally adhering ac
cavity, a rear obturating member detachably securable in
tion, dueto the tightness hereinabove mentioned, of the 35 the outer end of said cavity, said cavity being of larger
rear part 11 of the block B against the wall of the cham
diameter than said bore to define a shoulder therewith at
ber 3, and for the remainder, over the obturating cap
their junction, said cavity providing a chamber to receive
5. Thus, there is practically no transmission of the re
an ammunition unit carrying the pin, a barrel positioned
coil to the threaded link between the cap 5 and the 40 in said bore for sliding movement relative to said body,
body 4, which is a particularly desirable feature.
said barrel having a rear enlarged portion adapted to
After completion of the tiring, the cap 5 is unscrewed
move in said cavity, said por-tion having a shoulder
from the threaded body 4. The barrel 1 is then taken
adapted to abut said -iìrst shoulder, said barrel, when ac
out, by sliding it rearwards in the body 4, thus pushing
tuated rearwardly following detachment of the obturating
out of the loading chamber 3 the rear part 11 of the block 45 member, providing ejection of the spent ammunition unit
situated in said loading chamber.
from the cavity.
'It is to be noted that the bottom of the cavity 13 of the
2. A tiring device as claimed in claim 1, wherein the
block B is slightly on the downstream side with respect
barrel has a front part which protrudes from said body,
to the shoulder 12. This particularity is very important,
so that said barrel may be driven by its front part into
because when the block B is put in place in the ñring de 50 said body for ejecting, by its rear part, said spent ammuni
vice, it presents the lower resistance section at the level
tion out of the cavity.
of «the shoulder 12, in such a way that when the shot is
tired, there will remain practically nothing of the front
part 9 of the block B within the barrel.
This feature facilitates the ejection of the rear part 11 55
of »this block,
References Cited in the tile of this patent
Belgium ...... __, _____ __ Nov. i4, 1951
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