US2163475A

US2163475A - Blasting device

Info

Publication number: US2163475A
Application number: US52907A
Authority: US
Inventors: Anthony J Tomalis
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-12-04
Filing date: 1935-12-04
Publication date: 1939-06-20
Anticipated expiration: 1956-06-20

Description

Junez'o, 1939.

A. J. TQMALIS BLASTING DEVICE Filed Deel 4, 1935 Invento'r gunnen,-

Attorney Patented June 20,- 1939 I'UNITED STATES PATENT OFFICEV 1 Claim.

This invention appertains to new and useful improvements in blasting switches and more particularly to a switch employing a light vwhich serves to indicate when the circuit is properly functioning.

During the course of the following specification other important objects and advantages of the invention will become apparent to the reader.

In the drawing: Figure 1 represents a side elevational view of the switch with parts broken away.

Figure 2 represents a vertical sectional view through the switch taken substantially on the,

' linev 2 2 of Figure l.

Figure 3 is a perspective view of one of the lamp contacts.

Figure 4 represents a perspective view of the other lamp contact.

Figure 5 is a diagrammatic view showing the electrical connection in and from the switch.

Referring to the drawing wherein like numerals designate like parts, it can be seen that the switch consists of a block 5 of dielectric material having the transverse bore 6 therein and also a vertically extending bore 1. The vertically extending bore 'l .has a lampsocket 8 therein for receiving a bulb 9. Numeral I Il represents a dielectric block' located in thev transverse bore 6 through which the stem II is slidable. This stem II extending through the large opening I2 in the lower portion of the contact strip I3, which strip I3 is provided with a laterally extending contact 'portion I4 for engaging the center contact I5 of the bulb 9. The stem II has-a contact'head I5 there- Figure 2.

The opposite end of the stem I I projects beyond one side of the body 5 and has a hand knob I1 thereon. Interposed between this knob I1 and the lower portion of the contact strip I8 is a coiled compressible spring I9 which serves to maintain the stem II urged toward the left in Figure 2 so as to maintain the contact head I 6 engaged with the co'ntact strip I3.

Rods 2I-22 extend downwardly through the body 5 at opposite sides of the block I0. The lower end of the rod 22 is provided with a threaded bore 23 for receiving the upper threaded end t portion of the pointed contact strip 24. A jam "o nut and washer 25 is provided on the pin 24 and can be jammed against the bottom of the body 5 to prevent self-adjustment of the pin 2l.r A strip 26 provided with a longitudinally extending slot 21 therein has a depending pointed contact prong 28. A set screw-23 extends through the slot 21 and is driven, into the threaded bre 30 in the lower end of the rod 2|. The upper end of each of the rods 2I-22 is threaded to accommodate a conductor binding nut 3|. Extending from the rod 2| is a bus 32 which connects to the contact l strip I8 while abus strip 33 extends from the rod 22 to engage the contact strip I3.

In the'useoi' this device, the switch is normally closed. This is the normal position of the switch elements. Current will not flow along the conductors 35-35a until this switch is opened. However, to test the battery land the switch above described, the shunt 20 with the lamp 9 therein is employed and without the conductors 35-35a connected with the explosive charge, by opening the switch I6 (see Figure 5) current will flow through this shunt and energize the lamp 9. This indicates that the switching circuit is in operation. vThe prongs 24-28 are then disconnectedvfrom the battery and the wires 35-35a connected with the charge and the operator then takes the device to a remote point oi. safety and by applying the prongs 24-28 to the usual blasting battery and pushing the button I1 so as to open the switch, the electric energy sent along the circuit including the wires 35-35a, setting oi the charge. However, as long as' the switch is closed the charge will not be set off and this obvi-l ously serves as a-sai'ety device.

Obviously if when the switch is opened and the light is energized and the explosive is not set oif, the indication is that there is something wrong with the connection to the charge or in the conductors 35- 35a.

While the foregoing specification sets forth the invention in specic terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit or scope of the invention as claimed hereinafter. V

Hating thus described the invention, claimed as new is:

A switch structure for blasting circuits com- `what is 'prising a body having a pair of battery engageable contact pins protruding therefrom, a lamp on the body, a pair of binding posts on the body connected with the pins,.a switch mounted on the body, connections between the binding posts and opposite sides of the switch, a shunt around said switch and having the lamp therein, a slotted member carrying one of the pins, a screw disposed through the said slotted member and driven into one of the said'binding posts, said screw having the said slotted member slidable thereon when the screw is unloosened with respect to its corresponding bindingv post.

ANTHONY J. TOMALIS.