US1479070A - Blasting - Google Patents

Description

Jan. 1, 1924 v 1,479,070

W. E. HARRIS BLASTING Filed July 18. 1922 iffarn 94 Patented Jan. l, 1924.

UNITED STATES WILLIAM EDWARD HARRIS, OF LUIPAARDSVLEI, TRANSVAAL, SOUTH AFRICA.

BLASTIN G.

Application filed July 18, 1922. Serial No. 575,791.

To all whom it may concern:

Be it known that I, WILLIAM EDWARD HARRIS, subject of the King of Great Britain, residing at Luipaardsvlei, Transvaal Province of the Union of South Africa, have invented certain new and useful Improvements in and Relating to Blasting, of which the following is a specification.

This invention relates to blasting and its object is to produce a device which will not allow the tamping to blow out and will enable a perfect explosion to take place.

According to this invention a check is provided for insertion after the usual tamping which consists of two portions each substantially the shape of a cylinder a portion of which has been removed by a plane passing from one end of a diameter at or near the base to the opposite end of the corresponding diameter of the top, thus forming a wedge with a rounded back, any cross section of the wedge being substantially D shaped. The face thus formed has in it a groove running centrally down it and graduated in depth from the one end to the other so that when the two portions are placed together face to face the grooves on each portion form together a channel in which the fuse fits, the whole device being substantially cylindrical.

The invention is illustrated in the accompanying drawings in which Fig. I shows the two portions of the check separated and in perspective.

Fig. II shows a perspective view of the check with the fuse in position.

Referring to Fig. I, 1 is the groove in which the fuse fits and 2 is the inclined face of the wedge which is formed with a rounded back 3. Serrations 4 may beprovided on one of the portions of the check in order to assist in retaining it in position against the force of the explosion but such serrations are not essential.

Fig. II shows the two portions of the check with the fuse 5 in position.

When the two portions are placed together in the manner indicated in a hole made by a drill the top of the check 6 is tapped home thus expanding the check as a whole and forcing it into intimate contact with the wall of the cavity.

When the explosion takes place the force applied to the tamping end 7 of the check tends to expand it and hold it in position instead of forcing it out.

The checks are preferably made of glass, pottery, hardwood, fibre or some such material which will not do any damage should it be carried to the reduction plant. The use of this check ensures a perfect explosion, more ground can be taken and there is no tendency of the displaced rock to spread and do damage in the working place.

I claim:

1. A cylindrical check comprising a pair of complemental reversely-arranged wedge portions, each portion having an inclined face portion extending from the end of one side of said portion to near the other end of the side directly opposite, and each of said wedge portions having a groove therein extending along the entire inclined face portion, and along the outside of said wedge portion thereby forming continuous pas-- sage for the fuse.

2. A check for insertion. after the usual tamping consisting of two portions each sub stantia-lly the shape of a cylinder :1 portion of which has been removed by a plane passing from one end of a diameter at or near the base to the opposite end of the corre sponding diameter of the top, the face thus formed having in it a groove to accommodate the fuse. I

3. A check for insertion after the usual tamping consisting of two portions each sub stantially the shape of a cylinder a portion of which has been removed by a plane passing from one end of a diameter at or near the base to the opposite end of the corresponding diameter of the top, the face thus formed having in it a groove running cen trally down it and graduated in depth from one end to the other so that when the two portions are placed together face to face the grooves on each portion form a channel in which the fuse fits.

A check comprising two reversely-arranged complement-a1 members having their contacting surfaces disposed at an angle to the axis of the check whereby said surface; will be caused to exert a wedging action against each other when pressure is imposed against either end of the check; said surfaces being provided with grooves to form a continuous passage through the check for the fuse.

In testimony whereof I afix my signature.

WILLIAid EDWARD HARRIS.

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