US1865585A - Rock drill - Google Patents

Description

.July 5, 1932. K. M. PERRY ROCK DRILL Filed March 1929 INVENTOR I BY w yfin/m fm ATTORNEYS KENNETHJ'LPERRY Patented July 5, 1932 UNITED STATES PATENT OFFICE.

KENNETH M. PERRY, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR TO GEORGE C. RILEY,

' OF MONTREAL, CANADA 7 ROCK DRILL Application filed March 8,

This invention relates to new and useful improvements in rock drills and particularly to drills percussively driven and rotated and adapted for mine, quarry and other similar drilling operations.

The object of the invention is to provide a rock drill having a separable cutter head or bit so attached to the drill rod that the impact from the rock drilling machine is transmitted through the drill rod to the bit over a maximum area and on a plane at right angles to the direction of the blow.

A further object is to provide a rock drill with a. removable bit attached to the drill rod by a member which will be accessible so that the bit maybe quickly detached for repairs,

inspection or other purposes.

A still further object is to provide a removable cutter head or hit so attached to the rod 29 that the maximum diameter of the rod is less than the maximum diameter of the bit, such differences in diameter being suflicient to allow for clearance of the cuttings. A still further object is to provide a bit of small dimensions and weight so that it can 1 be economically manufactured. easily transported or carried to the drilling face and quickly and conveniently attached to the drill rod.

According to my invention, I provide a rock drill and a cutter head or hit held together by a connecting member, the head of which fits into a recess formed in the cutting face of the bit. The threaded shank of the connecting member passes through a hole'in the cutter and engages with a threaded socket formed in the end of the drill rod. The length of the threaded socket is such that the endof the connecting member cannot contact with the bottom of the socket to transmit the percussive blows from the rock drill through the rod and bolt to the surface being drilled. The bolt or connecting member is adapted to draw the abutting surfaces of the drill rod and the bit together so that the percussive blows from the drillingmach'ine are trans mitted directly by the drill rod to the bit through their contacting faces which are at 5 right angles to the direction of the saidblows.

'for the passage therethrough 1929. Serial No. 345,535.

f In the drawing which illustrates my inven Figure 1 is a perspective view showing a bit and a drill rod in assembled relation and made according to my invention.

Figure 2 is a part sectional elevation of the drill rod, bit and connecting member in assembled relation.

Figure 3 is a part sectional elevation showing the parts of the drill before assembly.

F igue4 is an end View of the connecting member.

Referring more particularly to the drawing, 11 designates a drill rod which for illustrative purposes is shown hexagonal in as cross section for substantially its full length merging into a rounded section towards the end 12. This dl'lll rod has a central hole 13 extending through the full length of the rod of a cooling and lubricating agent. The face 14 of the rod is at right angles to the aXis 15-15. Extending into the rod at the end 12 and from the face 14 is the threaded socket 16 adapted to engage with the threaded shank 17 of the connecting member 18. This member is pro-- vided with a central hole adapted to coincide with the hole in the drill rod. A bit 19 having a cutting surface 20 is provided with a recess 21 adapted to receive the head 22 of the connecting member. The head contacts with a shoulder 23 formed between the hole 24 and the recess 21. The shank of the connecting memberf passes through the hole 21 and engages with the threaded socket in the drill rod. The depth of the head is preferably made smaller than the depth of the recess so that the head lies below the cutting face of the bit. The face 25 of the bit remote from the cutting face is drawn against the adja cent face of the rod by the connecting member and the length of said member is such that at no time during the operation of the drill can the end of the connecting member contact with the bottom of the socket.

The end of the bit abutting the drill rod is preferably of the same diameter as the rounded portion of the rod so that when the abutting faces are drawn together, they will present the maximum surface for transmit- 1 machine through the recess in the cutting blows from the drilling drill rod directly to the bit. The maximum diameter of the cutting face of the bit is larger than the diameter of the drill rod, and the difference in diameter is such that cutting clearance is allowed.

This means that the wings of the bit have a'gradual slope merging into the outer diameter of the drill rod so thatan unimpeded passage is presented for the egress of the cuttings made by the bit and there are no protrusions or shoulders which would interfere with the free working of the drill. The connecting member or bolt may be made comparatively small in diameter as its duty is only to hold the adjacent faces of the bit and rod together. The head of the con necti'ng member may be provided with diametrically opposite flattened portions to facilitate the assembly or dismantling of the drill. The connecting member may be made of metal, the main feature. of which is its tensile strength. 'Thelrod may be made of ting the percussive a metal suitable for withstanding the shock and fatigue due to the percussive and rotating action of the drilling machine (notshown). The bit may be made from a metal different from the rod as the main qualities of the bit is the retention of a cutting edge. The bit is made small and light and is easily carried to the working face.

In operation, it will be geen that no threaded portions are expose which may become damaged through contact with the rock or the like. The rod is internally threaded so that the thread is protected from damage. The connecting members are light and inexpensive and very easily replaced. When the rod and connecting member are provided with central holes, lubricating and cooling fluid may be fed to the drilling face.

In the drawing, a rock:drill is shown but it will be evident that the connection may be used with substantially the same beneficial results on other types of drills.

\Vhat I claim is:

1. A rock drill comprising a drill rod, provided with a longitudinally extending bore,

the'end of thebore adjacent to the bit engaging end of the rod being enlarged and internally threaded, a to engage the said end of the drill rod, said bit being provided with a central bore aligned with the socket in the drill rod, the outer end of the bore being enlarged to form a central face of the bit, and a bolt having a longitudinally extending groove passing" through the bore of the bit with the head of the bolt countersunk in said recess and the shank of the bolt threaded into the socket formed in the drill rod, but termiand terminating at ing face contained in a plane perpendicular to said bore, the end of the bore adjacent to saidv bit engaging internally threaded, abit havinga base In witness whereof, I have hereunto set my hand.

KENNETH M. PERRY.

one end in a flat bit engag- I face being enlarged. and. a

bit having a base adapted nating in spaced relation to the bottom wall of the socket.

2. A rock drill comprising a drill rod rovided with a longitudinally extending bore

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