US 2393221 A
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Jan. 15, 1946. R. G. MERCER ET AL d Oct. 9, 1942 Jam 15, 1946- R. G. MERCER ET AL. 2,393,221
BLASTING CAP PACKAGE Filed Oct.' 9, 1942 2 Sheets-Sheet 2 INVENTORS ,P05/A77 G/z/fM/v /wwcf/F ATTORNEY Patented Jan. 15, 1946 BLASTING CAP PACKAGE Robert Gilman Mercer and David McWatty Taylor, New Castle, Pa.,
assignors to American Cyanamid d: Chemical Corporation, New York, N. Y., a corporation of Delaware Application october 9, 1942, serial No. 461,372
' 4 claims. (c1. 242-53) The present invention relates to a bundle ol' wires and to a meth'od of producing the same.
The .principal object of the present invention is to so wind, coil, or bundle the lead wires used to convey electric potential from an ignition device to a blasting charge, so that when the wire is run out between these points it will extend* freely without kinking. The invention further contemplates abundle of wires so produced, together with a protector and/or securing device, as a complete article of manufacture.
While the invention is particularly concerned Fig. is a view similar to Fig. 4 showing a com pleted and secured bundle;
Fig. 6 is a perspective view partly broken away showing the completed bundle in a sleeve; and
Fig. 7 is a view similar to Fig. 1 showing the method of extending a bundle of wires oi' the present invention without kinks.
Referring now withparticularity to the draw- Y.. ings and with particular reference to Fig. 1, there with' lead wires for electric blasting caps, yet the I invention is not to be restricted thereto, but contemplates the bundling of any material such as Wire or the like where in uncoiling or stretching out the same there is a tendency to produce kinks which are undesirable.
To this end the invention contemplates coiling or Vwinding a length of wire or wires so as to form -a series of loops or convolutions lying in proximity to each other, while in the preferred form the loops will be elongated and of greater length than width with substantially parallel sides, yet the invention is not limited thereto. The thus formed bundle is then twisted about its longitudinal axis by grasping the ends of the bundle and turning them in opposite directions until the end portion of each convolution lies in a plane substantially at right angles to the plane of its opposite end portion.
'I'he invention further contemplates securing a bundle of lead wires produced as above by placing a. bender tie around the center position so as to include and hold in place a blasting cap or the like attached to the lead wires, and also may include a tube or sleeve into which the thus secured bundle of wires may be stuil'ed to hold the entire assembly ready for use.
'Ih'e invention further consists in a novel arrangement, accommodation and construction of parts more fully hereinafter described and shown in vthe accompanying drawings, in which:
Fig. 1 is a diagrammatic perspective view of a bundle of wires being stretched out and showing its tendency to kink;
` Fig. 2 is a perspective detail showing the method of initially winding a bundle of wires according to thev present invention;
Fig. 3 is a similar view with the winding operation completed;
Fig. 4 is a front view o! the bundle after the coil of Fig. 3 h'as been twisted about the longitudinal axis of the bundle;
is shown at I an ordinary coil of wire or the like which it is desired to extend. Unless proper precautions are taken to hold the coil in a xed position the tendency is for the wire to come of! of the coll as shown in that iigure. It will be apparent that the tendency 0f the wire is to be taken from the coil in substantially the plane of the coil and as a result, while the top of each' individual loop at 2 will pull out without kinking, yet the lower portion 3 of the same loop will fold on itself, getting closer and closertogether as the end is pulled outwardly until a kink 4 results.
One of the problems in the blasting industry is to so bundle a length of lead wires for ignition caps that they may be quickly extended for use between the shot hole and th'e ignition device without kinking. Elaborate machinery is sometimes used for winding the lead wires in a figure 3" form which is intended to overcome this dimculty.` It has been found in actual practice, however, that not only must this winding be done very carefully, which' necessarily slows up the machine designed to accomplish the purpose, but in handling it is diillcult if not impossible to maintain the various figure 8 convolutions in their proper relationship so that they do not tangle when the wires are pulled out.
The above diiliculties may be readily overcome by winding a length of wire I upon two fixed posts 5 in a clockwise direction so as to produce the elongated bundle 6 as shown in Fig. 3. If rods or other instruments 'I and 8 are then placed through the ends 9 and I0 of the coil of Fig. 3 and twisted in opposite directions as in Fig. 4, the bundle Il of Fig. 5 results.
Where desired a band I 2 of any desired material can be placed about the middle portion of the bundle to secure the same against accidental displacement. This is particularly desirable where a blasting cap I3 is already attached to an end of the wires in which case the securing band I2 may be used to hold th'e cap in proper place in the bundle.
In order to protect the bundle and cap it is desirable to place the entire unit within a tube or the like I4 of such a size that the wires bind bundle I l.
sufliciently against the inner wall thereof so as to prevent displacement.
When using the bundle prepared according to the present invention it is only necessary to remove the bundle from the tube or sleeve Il, take o5 the band I2, grasp the loose end of the wire l5 (Fig. '1) and lpull the end away from the As shown in Fig. 7, the loop 9 will naturally open out without any diillculty. Due to the fact that the opposite end of the loop as shown at I0 is in a plane substantially at right angles to the plane of the direction o! pull, the wire at this part will open out without kinking due to the fact that it does not cross over upon itself.
In practicing the present invention, it is immaterial whether the initial winding is made clockwise or counter-clockwise, provided the final twist is made in the right direction.
Such a bundle may be manufactured much VYmore cheaply than the ordinary gure B variety because the winding machines can travel much faster without the necessity for a cross-over.
While the invention has been ushown and described with reference -to a speciilc modiiication it obviously is not to be restricted thereto, but is to be construed broadly and limited only by the scope of the claims.
What is claimed is:
l. A1 method of producing a bundle ci' wire which includes the steps of forming a length of wire into a plurality of substantially parallel convolutions in proximity to each other, and thereafter twisting the convolutions as a whole so that one portion of each convolution lies substantially in a plane at right angles to the plane o! the remaining portion thereof.
2. A method of'producing a bundle of wires which includes the steps of winding a length of wire around two spaced' apart posts so as to form a plurality of elongated convolutions each Yof which has two substantially parallel sides, and thereafter twisting the convolutions as a whole so that one portionof each convolution lies sub- Moreover, itis not nearly as essential that the bundle of the present invention maintain the individual convolutions in their exact location. Due to the fact that the two ends of each convolution lie in planes substantially at right angles with each other, the wire may be extended rapidly and has a, tendency to untangle itself, all without the formation of kinks. I
It has been found that in the preparation of bundles of blasting cap leads even though a double wire is used no difliculty has been experienced in rapidly extending the wires without fouling or kinking.
fili` stantiallyin a plane at right angles to the plane of the remaining por-tion thereof.
3. Thevmethod of claim 2 in which a plurality of lengths of wire are wound simultaneously and then twisted simultaneously.
4. A bundle of wires comprising a plurality Aof convolutions in proximity to each other, each convolution being in the form of an elongated loop, one end portion of each convolution lying in a plane substantially at right angles to the l plane of the other end portion.
ROBERT GmMAN MERCER. DAVID McWA'I'rY TAYLOR.