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Патент USA US2405507

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Aug- 5» 1946-
E. K. LEFléEN .
2,405,507
CHARGER FOR EXPLOSIVES
Filed Nov. ' 21, 1942
INVENTOR.
BY EDWARD K. LEFRE/V
W
Q\Ma».é~
2,405,567
Patented Aug. 6, 1946
UNITED STATES PATENT orrics
2,405,507
CHARGER FOR EXPLOSIVES
Edward K. Lefren, Port Ewen, N. Y., assignor to
Hercules Powder Company, Wilmington, DeL, a
corporation of Delaware
I
Application November 21, 1942, Serial No. 466,391
3 Claims.
(Cl. 222-197)
2
1
Having now indicated in a general way the
nature and purpose of this invention, there fol
lows a more detailed description of the preferred
with explosives.
embodiment thereof with reference to the accom
Heretofore equipment used for the charging
of detonator shells With explosives has not been 5 panying drawing in which:
provided with means adapted to insure a uniform
Fig. 1 is an elevational View, partly in section,
weight of charge of explosive. It is common pracshowing the improved explosive charging device
tice in charging detonator shells to dump the ex_
in charge receiving position.
plosive on the top side of a charging plate conFig. 2 is a fragmentary view showing the device
This invention relates to an improved machine
for charging detonator shells and similar articles
sisting of a plurality of explosive receiving bins 10 in charge releasing position.
or openings each having a ?xed volume. The exReferring to the drawings, numeral 4 indicates
plosive is then moved across the face of the plate
a supporting means as, for example, a platform
by means of a Wiper thereby ?lling the openings.
or a table supporting the explosive charger indi
The excess explosive spills over the edges of the
cated generally at 5 through leg supports 6. An
charging plate into a suitable catch means. The 15 explosive releasing means or dump plate “I is held
charging plate is then moved into shell loading
in ?xed position by means of said legs 6 in spaced
position in order to dump the ?xed volume of
explosive into a detonator shell. This method of
relationship with said support 4. The dump plate
l is provided with a plurality of openings 8 uni
charging by spilling the explosive into ‘the charg_
formly spaced throughout the plate. The number
ing plate openings permits considerable variations 20 of openings depends upon the number of shells
in the weight of the charge of explosive delivered
desired to be charged at a single operation and
to‘each detonator or series of detonators, because
may be as many as 500.
variations occur in the volume of the charge
Spaced from the dump plate 1 is an explosive
(even though each opening in the charging plate
storage means or plate 9 provided with a plurality
is of the same volume) due to the tendency for 25 of explosive receiving bins or openings I0. These
the wiper or explosive moving means to carry a
bins may be conical in shape as shown and may
portion of the explosive out of the top of some
have a capacity sufficient to receive enough ex
holes and, in other cases, for the wiper to ride
plosive to charge ?ve or more consecutive series
over the explosive leaving extra explosive on the
of shells without the necessity of charging the
charge plate opening. Furthermore, the weight 30 bins with more explosive,
,
of the explosive charge varies with the degree to
The bins are charged by means of an explosive
which it is packed, which varies with the amount
storage means or hopper l l adapted to be slid
of explosive being moved across a particular
ably moved across the face of the storage plate
charge plate opening.
When varying weight
9 and into registry-with the openings it. As each
charges of explosive are charged into a shell and R5 bin It] comes into registry with the moving hop
the shell is subjected to a pressing operation,
per the explosive l2, which may be mercury ful
there is a tendency for the charge to be overminate, diazodinitrophenol,pentaerythritol tetra
pressed in the case where an excess of explosive
nitrate, etc., drops from the hopper into the bin.
is charged, and to be underpressed when an inMovement of the hopper is regulated to permit
su?‘icient amount of explosive is charged. When ‘10 complete ?lling of each bin.
the priming charge of a detonator is overpressed,
An explosive charging means or ?xed Weight
adefective detonator results which detonator may
charge receiving plate or metering plate i3 is
fail to explode when put into use. Defective detomovably positioned between the storage plate 9
nators are dangerous to work with and may result
and the dump plate 1 and provided with explosive
in loss of life. '
4'5 charge receiving openings or chambers Hi. There
Therefore, it is an object of this invention to
are as many chamberslll as there are bins I0 in
provide a charging device for detonator shells
and the like, whereby a ?xed weight of explosive
charge will always be delivered to the detonator,
the storage plate and openings 8 in the dump
plate. In order to reduce to a minimum the pos
sibilty of the sensitive explosive l2 being acci
thereby insuring uniform pressing of the charge 50 dentally detonated through pinching which would
in the shell.
A further object is to provide means for charging a detonator with a ?xed weight of explosive
charge in an economical, e?icient and safe mann91"
5.5
occur should the explosive be caught between two
hard surfaces, a soft rubber facing l5 and I6 is
placed on the surface of the storage plate and
dump plate, and soft rubber facing 23 and 24 is
placed on the upper surface of storage plate 9
glasses
3
4
and on the lower surface of storage hopper II
respectively. The charging plate I3 moves in
density of the charge will be less under a given
condition of packing than when the regular and
sliding contact with and between the spaced rub
desired grain size of explosive is charged under
the same conditions of packing. Where the grain
ber facings I5 and I 5 between guides I1 and I8
which limit the movement of the charge plate and
permit positive alignment of the chambers I4 with
the bins I0 and with the openings 8, respectively.
Other guides (not shown) prevent movement of
size is smaller than the desired grain size, a great
er number of grains of explosive will be received
in the chambers and consequently the‘ resulting
density of the charge will be‘ greater than when a
regular grain size is being charged, .In order to
the charging plate laterally to its normal move
ill compensate for these occasional density varia
ment.
tions, it has been found that the vibrator I 9 may
A suitable vibrating means as, for example. the
be used to bring the density of the charge to a
vibrating means I9 is attached to the table {land
predetermined value regardless of the normal
through its controlled operation thexexplosive I?
may be packed in the chambers It to a; uniform
variation in" grain size which may occasionally
density,
Uniform density may be accomplished '
by other means as, for example, the bins I-U/ may
be ?lled to the same level and in this way main:
tain a ?xed static head of explosive which will
exert a uniform packing effect on the explosive
in‘ the chambers I ll, thereby resulting. in
ex- ‘
plosiv'e charge‘ having a uniform density. Since
each chamber i4 is of the same volume and each
chamber is uniformly packed, then each shell will
receive a ?xed Weight charge of explosive.
Explosive‘ receiving containers as, for example,
detonater shells 26 are carried in a suitable sup
occur.
It is apparent that the objects of this invention
have been attained by providing an improved
machine for charging detonator shells; that the
machine in accordancewith the present inven
tion permits uniform weight charging of deto
nator shells and the like, eliminates the spilling
of explosive; all of which is accomplished in a
more economical,‘ efficient, and safe manner than
heretofore realized.
What I claim and desire to protect by Letters
Patent is:
port means as, for example, shell press block 2!
l. In a device for, charging explosive containers
which is slid. on the top side' of the table ll'b'en‘eath
with a ?xed weight of explosive,» the combination
the charger 5. Each shell is moved into registry
ofa storage plate havinga plurality of explosive
or axial alignment with“ a corresponding opening 30 receiving bins therein; a storage hopper slidable
3 in the dump plate ‘I by reason of the fact that
over said storage plate; a dump plate with a plu
the shell press block 2 i" is guided into a predeter
rality of openings displaced from axial alignment
mined position fixed by means of the guides 22
with‘ said bins; and a metering’ plate in close ?t
and other stop means (not shown) located on the
ting slidable relationship between said- storage
far side of the table 4‘.
and dump plates and, a plurality of chambers in
The charger is operated by first’ moving the
said metering platev alignable in registry with the
chambers Irl'out of registry with the bins I6‘ by
moving the charging plate is to the right relative
receiving bins and dump plate openings.
the face of the storage plate 9‘ slowly enough to
?ll each bin with the explosive‘ I2. The charging
plate 'is' then moved to the left relative‘ to Fig, 1
receiving bins therein; a‘ storage hopper slidable
2; in a device for charging explosive containers
to Fig. 1. This movement closes the bottom of
with a ?xed weight of explosive, thewcombination
each bin. The hopper II is then moved across 40 of a storage plate having a plurality of explosive
the guide‘ I‘l stops the movement at a position
where each chamber Ill is in registry with a cor- .,=
responding bin Ill, The explosive I2 drops from
each bin into the chamber in registry therewith‘
?lling each chamber with a uniform amount of
explosive. The charging plate is then moved to
the right relative to‘ Fig. 1 until each chamber is
in registry with a corresponding opening 8 which
movement is determined by means of the guide
58. The ?xed weight charge of explosive drops
through the opening 8- into corresponding deto
nator shells 2t‘. The shell press block is then re
moved from the table and another series of shells
are moved into position under the charger and
the same procedure repeated.
Occasionally the density of a batch of explosive
to be charged will vary in respect to the density
of another batch of explosive. This density varia
tion is a function of the grain size of the explo
over said storage plate; a dump plate“ with a plu-‘
rality'of openings displaced from axial alignment
with said bins; a metering plate in close ?tting
slidable relationship between ‘said storage and
dump plates and'a plurality of chambers in said
metering plate align'able in registry with the re
ceiving bins and dump plate“ openings; and means
fo'r'vibrating the aforesaid device.
In a device for charging explosive containers
with a ?xed weight of- explosive, the combination
of a" storage plate having a plurality of explosive
receiving bins therein; a storage hopper slidable
over said storage plate; a resilient facing between
the storage hopper and storage plate; a dump
plate with a plurality of openings displaced from
axial alignment with said bins; a resilient facing
on‘ the lower side of said storage plate; a resilient
facing on the upper side of said dump plate; a
metering plate in close ?tting slidable relation‘
shipbetween resilient fa'cings on‘ said storage and
dump plates and a plurality of chambers in said
metering plate alignable in registry with the re
ceiving bins and dump plate openings; and means
creased, a lesser number of grains are received in 65 for vibrating the aforesaid device.
the chambers I0 and consequently the resulting
EDWARD K. LEFREN.
sive. Thus, it may be readily seen that when the
grain size of the explosive is unintentionally in
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