US746262A

US746262A - Device for protecting blasting-caps.

Info

Publication number: US746262A
Application number: US15580203A
Authority: US
Inventors: Donald B Gillies
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-05-06
Filing date: 1903-05-06
Publication date: 1903-12-08
Anticipated expiration: 1920-12-08

Description

No. 746,262. PATENTED DEC. 8, 1903. D. B. GILLIES.

DEVICE FOR PROTECTING BLASTING CAPS.

APPLICATION FILED MAY e, 1903.

E0 MODEL.

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iJNi'rsn STATES- Patented December 8, 1908.

ATENT rides.

DONALD B. GILLIES, OF BUTTE, MONTANA, ASSIGNOR TO RALPH -BAGGALEY,.OF PITTSBURG, PENNSYLVANIA.

fisvlcs'F-oe PROTECTING BLASTlNG-CAPS.

SPEGIFICATIUN forming part of Letters Patent No. 746,262, dated December 8, 1903.

To all whom it may concern:

Be it known that I, DONALD. E. GILLIEs, of Butte, Silver Bow county, Montana, have invented a new and useful Device for Protecting Blasting-Gaps, of which the followingis a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a longitudinal section of the sheath. Fig. 2, is a side view, and Fig. 3 an end view, of a guide for inserting the cap into the sheath. Fig 4 is a sectional view showing the cap incased in the sheath. -J Iii-blasting operations, especially in mines where there are water-veins, many accidents have occurred by reason of the wetting of the explosive-caps which are used to explode the charges of dynamite. It is the practice in mining to explode the charges in a number of blast-holes, and when one of them fails to explode it will remain unnoticed, but is apt to explode with dangerous effect whenstruck by a minerjs pick or drill. a

My invention provides means by which certainty of explosion of the caps is secured, and

I efiect this result by providing means for readily incasing the cap in a flexible waterproof sheath, preferably of rubber, which when fitted tightly around the cap excludes water from it and keeps it dry-an'd fit fol-detonationunder all conditions.

15: Fig. 1 of the accompanying drawings, 2

Application filed May 6, 1903. Serial No. 155,802. (No model.)

represents the flexible rubber sheath, which in Fig. 4 is shown fitted around the detonating cap 3, to which the fuse 4 is attached. The

neck of the sheath is preferably contracted, as shown in Fig. 1, so that it will fit tightly against the cap or the fuse.

In Figs. 2 and 3 I show a device consisting of a tapering guide-frame composed. of a slotted ring 5 and spring-arms 6, which I use for fitting the cap in the sheath. The springarms 6 of this guide-frame are inserted into the sheath, the -cap is pushed-between the arms, and the guide can .ihen be withdrawn, leaving the cap incased'in the rubber, as shown in Fig. 4.

I claim- 1. A guide for inserting a blasting-cap into a fiexible'sheath,said guide comprising springarnis adapted to be inserted into the sheath and affording between them a passage for the cap; substantially as described.

2. A guide for inserting a blasting-cap into a flexible sheath, said guide comprising tapering spring-arms adapted to be inserted into the sheath and affording between them a passage forvthe cap; substantially as described.

'In testimony whereof I have hereunto set my hand. 3

" DONALD E. GILLIES.

Witnesses:

WM. M. KIRKPATRICK, D. E. J AOKMAN.