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Патент USA US2129835

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Sept. 13, 1938.
> K. S-CHAFFLER~GLC3SSL
2,129,835
ELECTRIC SHOT-FIRING MACHINE
Filed ‘May '5, 1957
“gay, -'
/
2,129,835
Ratented Sept. 13, 1938
‘UNITED STATES PATENT OFFICE
2,129,835
ELECTRIC SHOT-FIRING MACHINE
Konrad Scha?lcrfGliissl, Vienna, Austria
Application May 5, 1937, Serial No. 140,870
InAustria April 15, 193':
6 Claims. (Cl. 171-76)
This invention relates to electric shot-?ring
machines equipped with means for ensuring the
delivery of current of su?icient strength to effect
ignition with certainty.
It is already known to provide hand- or spring
driven shot-?ring machines with an instantane
ous contacting device which only closes the cur
rent circuit through the generator and the shot
?ring line at the end of the driving impulse,
10 that is to say when the armature of the genera
tor has attained its maximum speed of rotation.
In the case of hand-driven shot-?ring machines,
however, this maximum speed of rotation de
pends upon the manual force and skill used in
15 carrying out the driving operation, and it may
01
easily happen, if this operation is performed with
insu?icient energy or skill, that the voltage of the
current generated in the machine is not high
enough to ensure faultless ?ring of all the fuses
connected to the machine.
Attempts have been made to overcome this
drawback by arranging for the circuit to be closed
by a relay responsive to the voltage of the cur
rent generated in the machine. It is impossible,
25 however, with an arrangement of this nature,
to preclude with certainty the possibility of the
relay effecting closing of the circuit with some
delay, that is to say at a moment of time at which
the drop in the voltage of the current generated
30 by the machine, which occurs immediately after
the driving impulse ceases, owing to the imme
diate falling off of the speed of rotation of the
armature, has already taken effect. Now since
with electric shot-?ring machines the maximum
3 duration of the ?ring current may not exceed
pulse, to ensure faultless firing of all the fuses
the magnetic ?eld in the magnet frame or yoke
of the machine does not attain the strength ap
propriate to the required output voltage, and the
switch contact consequently remains blocked by 5
the means provided for this purpose. The shot
?ring circuit including the fuses thus remains
open, and no current impulse that would be in
adequate for ?ring all the fuses connected up to
the machine can pass into the shot-?ring line. 10
The operator of the machine is thus compelled
to start again and to impart a more powerful
driving impulse to the machine, and if this be
successfully achieved the blocking device is 'put
out of action, and a current impulse of su?icient 15
voltage ?ows into the shot-?ring line.
In the accompanying drawing there is shown,
diagrammatically, an electric shot-?ring ma
chine according to the invention equipped with
means for blocking and releasing the switch con 20
tact in dependence on the strength of the mag
netic ?eld of the current generator. In the shot
?ring machine, which consists in a known man
ner of the armature i, magnet core 3, magnet
?eld coil 2, and toothed sector 4 adapted to be
driven by means of a handle in the direction in
dicated by the arrow and to effect rotation of the
armature through the instrumentality ofv inter
mediate gearing not shown in the drawing, the
switch contact for the ?ring current, which may
consist for instance of the switch pin 5, the slide
6, and the leaf springs ‘I, is operated by means
of the pawl 8 mounted on the toothed sector 4.
This pawl bears slidingly against the end of the
slide 6 during the movement of the sector 5
@300 of a second it will be clear that a very slight ‘ amounting to about one-third of a complete revo
error in timing will su?ice, under unfavorable lution, thereby moving this slide and causing
circumstances, to render the short current im
the switch pin 5 to pass between the springs ‘l,
pulse supplied to the shot-?ring line too weak with the result that the current circuit through
the machine and the fuses 9 ,is closed. After 40
40 to ignite all the fuses connected thereto.
With the shot-?ring machine according to the the pawl 8 comes clear of the slide 6 this latter
present invention the danger of the current im
and the pin 5 are restored to the circuit-break
pulse generated being insu?icient to ?re all the ing position by the previously compressed spring
Ill. The length of time elapsing between circuit
fuses connected thereto, or rather of too weak an
closing and circuit-interruption amounts at the 45
45 impulse being allowed to ?ow through the shot
?ring line, is avoided with certainty by the provi
most to ‘7100 sec.
sion of a blocking device for the ?ring current
In order to ensure that the contacting device
switch contact, which only liberates this contact 5, '6 shall not be able to effect circuit closing when
for operation providedthe magnetic ?eld of the the speed of rotation of the armature l is less
?ring machine has attained the strength corre
than is necessary to generate a current of sufli
sponding to the requisite voltage of the ?ring cient voltage the slide 6 is blocked by means of
If then in the case of a hand-driven
a latch II the end of which engages in a notch
shot-?ring machine the voltage of the current
generated is not quite high enough, for instance
55 owing to an insu?iciently powerful driving im
current.
vl5 in the slide. The blocking thus effected is only
cancelled when the magnetic ?eld of the ma
chine, after having increased in strength until 55
2
2,129,835
the voltage of the current generated in the ma
chine has attained a predetermined ?gure, at
tracts an armature l3 mounted on the blocking
latch l I, through the intermediary of a pole piece
I! connected with the magnet core 3 and mag
netized thereby. Provided the switch contact be
liberated immediately before the moment at
which the current impulse generated by the ar
mature reaches its maximum value, the circuit
10 closing will be effected when the voltage is at
its maximum. Ii.’ however, in consequence of too
weak a driving impulse being imparted to the
Sector 4 in operating the machine, only a cur
rent of somewhat too low a voltage is generated,
15 the magnetic ?eld set up will be correspondingly
too weak, with the result that the armature l3
on the latch II is not attracted and the current
circuit remains open. A current impulse that is
not sufficient to ensure ignition of all the fuses
connected up to the machine can not, therefore,
pass into the shot-?ring line.
After interruption of the current and disap
pearance of the e?ective magnet ?eld between
the parts l2 and IS, the latch H returns into
its locking position under the in?uence of its
spring H.
I claim:
1. In a dynamo-electric shot-?ring machine
the combination with an igniting circuit including
30 a charge igniting device, of an electric current
generator in said igniting circuit, spaced contacts
in said circuit, means for momentarily bridging
said contacts and thereby closing said circuit,
means for operating said generator having asso
ciated therewith means for imparting an oper
ating impulse of predetermined extremely short
duration to said circuit-closing means, a detain
ing contrivance normally arrestingly engaging in
said impelling means and operatively responsive
to the strength of the magnetic ?eld of said gen
erator to release said impelling means only when
the strength of said magnetic ?eld reaches a
predetermined value.
_
2. In a dynamo-electric shot-?ring machine the
combination with an igniting circuit including a
charge igniting device, of an electric current gen
erator having a ?eld magnet yoke and disposed in
said igniting circuit, spaced contacts in said cir
cuit, means including a sliding thrust member
for momentarily bridging said contacts 'and
thereby closing said circuit, means for operating
said generator having associated therewith means
for imparting an operating impulse of predeter
mined and extremely short duration to said cir
55 cuit-closing means, -a movable latch normally
arrestingly engaging in said thrust member, and
a magnet armature mounted on said latch within
the range of the lines of force proceeding from the
said magnet yoke, said latch and armature being
so disposed that said latch is moved out of en
gagement with said thrust member when the
strength of the magnetic ?eld of said generator
reaches a predetermined value.
3. In a dynamo-electric shot-?ring machine
65 the combination with an igniting circuit including
a charge igniting device, of an electric current
generator having a ?eld magnet yoke and dis
posed in said igniting circuit, a pole piece made
of magnetizable material and conductively con
70 nected with the said magnet yoke, spaced con
tacts in said circuit, means including a sliding
thrust member for momentarily bridging said
contacts and thereby closing said circuit, means
for operating said generator having associated
75 therewith means for imparting an operative im
pulse of predetermined and extremely short dura
tion to said circuit-closing means, a movable latch
normally arrestingly engaging in said thrust
member, and a magnet armature mounted on
said latch for attraction to said pole piece to move
said latch out of engagement with said thrust
member when the strength of the magnetic ?eld
of said generator reaches a predetermined value.
4. In a dynamo-electric shot-?ring machine
the combination with an igniting circuit including
a charge igniting device, of an electric current
generator having a ?eld magnet yoke and disposed
in said igniting circuit, a pole piece made of mag
netizable material and conductively connected
with the said magnet yoke, spaced contacts in 15
said circuit, means including a sliding thrust
member for momentarily bridging ‘said contacts
and thereby closing said circuit, said thrust mem
ber having an abutment surface accessible from
the direction towards which said member is 20
adapted to move in the circuit-closing operation,
means for operating said generator having asso
ciated therewith means for imparting an oper
ative impulse of predetermined and extremely
short duration to said circuit closing means, a 25
movable latch normally engaging against said
abutment surface to detain said thrust member,
and a magnet armature mounted on said latch
for attraction to said pole piece to move said
latch out of engagement with said abutment sur 30
face and thereby to liberate said thrust member
for operation in response to said impelling means
when the strength of the magnetic ?eld of said
generator reaches a predetermined value.
5. In a dynamo-electric shot-?ring machine 35
the combination with an igniting circuit includ
ing a charge igniting device, of an electric cur
rent generator having a ?eld magnet yoke and
disposed in said igniting circuit, a pole piece made
of magnetizable material and conductively con 40
nected with the said magnet yoke, spaced con
tacts in said circuit, means including a sliding
thrust member for momentarily bridging said
contacts and thereby closing said circuit, said
thrust member having a recess presenting an 45
abutment surface accessible from the direction
towards which said member is adapted to move
in the circuit-closing operation, means for oper
ating said generator having associated therewith
means for imparting an operative impulse of pre 50
determined and extremely short duration to said
circuit-closing means, a movable latch normally
engaging against said abutment surface to detain
said thrust member, and a magnet armature
mounted on said latch for attraction to said pole 56
piece to move said latch out of engagement with
said abutment surface and thereby to release
said thrust member for operation in response to
said impelling means when the strength of the
magnetic ?eld of said generator reaches a pre—
determined value.
6. In a dynamo-electric shot~?ring machine
the combination with an igniting circuit includ
ing a charge igniting device, of an electric current
generator having a field magnet yoke and dis 65
posed in said igniting circuit, a pole piece made
of magnetizable material and conductively con
nected with the said magnet yoke, spaced contacts
interposed in said circuit, means including a slid
ing thrust member for momentarily bridging said 70
contacts and thereby closing said circuit, said
thrust member having a recess presenting an
abutment surface accessible from the direction
towards which the said thrust member is adapted
to move in the circuit-closing operation, means 75
3
2,129,835
for operating said generator having associated
therewith means for imparting an operative im
pulse of predetermined and extremely short dura
tion to said circuit closing means, a movable latch
spring stressed into engagement against said
abutment surface to detain said thrust member,
and a magnet armature mounted on said latch for
attraction to said pole piece to move said latch
clear of said abutment surface against the action
10 of said spring and thereby to release said thrust
member for operation in response to said impell
ing means when the strength of the magnetic
?eld of said generator overcomes the strength of
said spring, said spring being also adapted to
restore said latch to its initial position in engage
ment in front of said abutment surface after dis
continuance of the magnetic ?eld in said yoke and
pole piece and after the said thrust member has
returned into its inoperative position.
KONRAD SCHAFFLER-GLCSSL.
10
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