Title: Disc cutting unit for use on rock boring machines

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Claims: We claim:

1. A rock-boring machine of the type comprising a rotatable headplate having a plurality of disc cutting units mounted on the front face of the headplate; each disc cutting unit comprising a base adapted to be secured to the front face of the headplate, a bearing shaft mounted on the base, an annular body journalled for rotation on the bearing shaft and having a continuous recess extending around its periphery, a plurality of cutting segments located in the recess to extend around the periphery of the body, and removable clamping means adapted to secure the cutting segments in the recess.

2. A rock-boring machine as claimed in claim 1 in which the removable clamping means comprises a plurality of clamping blocks adapted to be located around the periphery of the body and to be so secured to the body as to bear against one side of the cutting segments.

3. A rock-boring machine as claimed in claim 2 in which the cutting segments lie between a side of the recess and the clamping blocks, the segments being tapered in cross-section, and the said side and the blocks being complementally undercut so that the segments are wedged between the side of the recess and the clamping blocks.

4. A cutter for an earth boring system that has a rotary unit which bores into earth formations to form a hole therein, said rotary unit functioning to form circular kerfs in the formation being bored to fracture rock between a proximate pair of said kerfs in a manner that causes fragments of the formation to be separated from the formation being bored, comprising:

a cutting wheel mounted upon said rotary unit for rotary motion to roll along the kerfs being cut; replaceable cutting means substantially encircling said cutting wheel for contacting said formations and forming a kerf therein, said cutting means consisting of a plurality of cutting elements, each of which partially encircle said cutting wheel; and means for removably affixing said cutting means to said cutting wheel.

5. The cutter of claim 4 wherein said means for removably affixing said cutting means to said cutting wheel includes a plurality of locking elements adapted to contact said cutting means and retainer means for affixing said locking elements to said cutting wheel.

6. The cutter of claim 5 wherein said locking elements include tapered surfaces that overlap said cutting elements.

Other info:

Inventors: Bingham, Henry (Transvaal, ZA)
Glassford, John Gilmour (Transvaal, ZA)
Pope, Noel Cuthbert (Transvaal, ZA)

Application Number: 365682
Filing Date: 1973-05-31
Publication_date: 1976-09-21
Assignee: Hard Metals Limited (Johannesburg, ZA)
Primary Class(es): 175/373 175/361, 175/374
Other Classes:
US Patent Ref:

1143275	Jun, 1915	Hughes	175/367.
1673285	Jun, 1928	Holdaway et al.	175/350.
1705055	Mar, 1929	Allison	175/351.
3204710	Sep, 1965	Bechem	175/351.
3572452	Mar, 1971	Winberg	175/371.
3734213	May, 1973	Goodfellow	175/374.
3752243	Aug, 1973	Hummer et al.	175/372.

Other Refs:
Primary Examiner: Purser, Ernest R.
Assistant Examiner: Favreau, Richard E.
Attorney: Young & Thompson