US1772994A - Blasting device - Google Patents

Description

Aug. 12, 1930. F. A. HALvERsoN BLASTING DEVICE Filed Sept. 8, 1928 .N. .w WNV .NLMMRN NNNN Patented Au, i2, l93

ljiiii FK AUGUST HALVERSON, OF GLEN RIHEY, PENNSYLVANIA BLASTING DEVICE Application nled September 8, 1928. Serial No. 304,826.

The resent invention relates to improveorder to provide a shoulder against which the ments 1n blasting devices and more particupellet 8 may engage.

larly refers to an improved pellet powder r- On the barrel and spaced from the ends ing tube with automatic air cushion shot atthereof are rings 12 and 13, themselves spaced a tachment. apart and acting to confine the adjustable col- An obj ect of the invention is to provide an lar, which is preferably made up of the two improved. blasting device which will insure a washers 14 and 15 welded or otherwise sesafe and unfailino detonation with squibs, cured together for mutual reinforcement. electric squibs and electric blasting caps in The collar has a limited axial movement on all types of shooting operations. the barrel, between the rings and is frictional- 5 A further object of the invention resides ly litted to the barrel whereby to remain in adin providing an extremely simple device for justed position. In Figure 1 is shown an air the above pur ose in which economy 1n the cushion space 16 lying between the collar and use of materia is promoted. pellet.

With the foregoing and other objects in In operation, the end 6 of the blasting tube e View, the invention will be more fully de- 5 is inserted, say for about four inches, into scribed hereinafter, and will be more partie4 the round center hole 7 of the pellet, and the ularly pointed out in the claims appended pellet is pushed firmly against the adjacent hereto. end of the barel 11, which is say four inches In the drawings, wherein like smbols relong. The barrel will hold the ,pellet in 1 fer to like or corresponding parts t rough-out place. Thereupon insert the pellet, so afxed the several views, to the tube, into the bore hole 9 and push it Figure 1 is a side view, partly broken away, back to the end of the hole, as shown in Figof the improved device shown as in place ure 1. The collar 14,'15 is adjusted along the ready for use. barrel, to the required position for giving the Figure 2 is a longitudinal section. desired length of cushioning air space or gap Figure 3 is a cross-section .taken on the line 16, before inserting the device in the bore 33 in Figure 2, and hole. 1When the device is moved to final po Figure e is a cross-section taken on the line sition the stemming 10 is introduced by use 4.4 also in Figure 2. of a copper tipped or other tamping bar with Referring more particularly to the daW- the groove of the bar placed against the blastings, which show only one embodiment ofthe ing tube 5, The Collar 14, 15 acts as an abutinvention, 5 designates a blasting tube, hOlvment to arrest the stemming and to provide low to receive the squib or fuse (not shown), the Spacelf, which may be two 01- three inches 3.3 and having one end 6 beveled, for insertion in in length, A Squib is placed iin the hollow the bore 7 0f -tbe ,pellet 01 pOWdGI Chil'g@ S- tube 5 and lighted, whereupon such squib will The tube 5 extends from the pellet, which iS run backward into pellet powder 8 through lodged in the base of the bore hole 8, to the a clear passage, and shot will instantly follow. mouth of such bore hole, where it is accessible In shooting pellet powder today with 4o for setting off the charge. The stemming squibs, miners and shot firers experience troumaterial, indicated at 10, is used to fill the ble in pushing the pellet back because of the bore 9 following the usual practice. miners needle being small and the pellet will A barrel 11 is mounted over the tube and is not go to back of hole without being broken-- preferably welded or otherwise aiiixed to the with the blasting tube this could not happen,

tube at a distance from one end thereof in as the cushion attachment is larger than the :firing hole in the pellet and will hold the pellet from' slipping back when being inserted. In stemming the hole under present methods, miners break the pellet when back with the tamper and pulverize it, in order to insure soft powder for the squib to ignite. This is a dangerous practice and it makes really two explosives in one shot. The fine dust of pellet will flare an instantbefore the solid pellets are ignited and part of the explosive force is lost and of no value. Furthermore, an excessive amount of smoke is created. In addition, in pulling the needle out of the hole through the stemming, the point of the needle will oft-times become bent by the heavy tamping bar and, of course, abent needle point will cause part of the stemming to fill the hole so the squibs progress into the pellet is blocked and the shot is not fired.

This means loss of time, loss of labor and loss of powder to the miner. Anything of this nature could not happen when the blasting tube was used as the hole in the tube would insure a clear passageway for the squib into the pellet and the cushion attachment would stop the tamping from breaking the pellet into dust in the stemming.

The cushioned eii'ect of all shooting is universally recommended b mining men because 3f its non-shattering ei'ict on coal and other material and the barrel arrangement with :ollar and rings to hold it and to make it adinst-able to whatever distance is required to secure best results can easily be arranged to ocal conditions. Also the collar will hold the itemming from crushing the pellet into dust.

All of the parts are preferably of copper to :omply with the rigid mining law.

It is obvious that various changes and modications may be made in the details of contruction and design of the above specifically lescribed embodiment of this invention withut departing from the spirit thereof, such hanges and modications being restricted `nly by the scope of the following claims 1, An improved blasting device comprisng a tube having one end adapted to be fitted ito the bore of a pellet and adapted to receive squib, a barrel on the tube spaced from the iserted end of t-he tube and abutting against de end of the pellet, and an adjustable rein- Jrced collar on the barrel for receiving iereagainst the stemming to form an air ishion space between the pellet and stemung.

2. An improved blasting device compris- 1g a tube having a beveled end to penetrate powder pellet charge, a barrel on the tube n abut against the pellet, spaced rings on the irrel, and a collar :trictionally and adjustily mounted on the barrel to form an abutent for the stemming and a cushioning space ljaeent the powder charge.

3. An improved blasting device, compris- FRANK AUGUST HALVERSON.

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