Lester J Sterwerf

53704487, Dec 6, 1994

May 17, 1993

8/062392

Lester J. Sterwerf - Harrison OH

Cincinnati Mine Machinery Company - Cincinnati OH

E21B 1200

299 91

A base member and bit holder assembly for replaceably mounting a bit on a mining machine, road working machine or earth moving machine. The bit is of the type having a shank terminating in at least one working end. The bit holder has a shank receiving perforation therein to receive the shank of the bit. A bit retainer releasably retains the bit shank in the bit holder shank receiving perforation. Cooperating abutment surfaces on the bit holder and bit determine the depth to which the bit shank extends into the shank receiving perforation of the bit holder. The bit holder has a tapered shank portion, and the base member has a correspondingly tapered cavity extending therethrough. The angularity of the tapers of the bit holder shank and base member cavity are the same, falling within the range of from about 6. degree. to about 12. degree. and are such that once the bit holder shank has been set in the base member cavity it will remain there until removed by an appropriate tool.

46748032, Jun 23, 1987

May 2, 1985

6/729571

Lester J. Sterwerf - Harrison OH

The Cincinnati Mine Machinery Company - Cincinnati OH

E21C 2726
E21C 2534

299 82

An endless chain in which there is one row of a plurality of H-shaped link elements across the width of the chain and an adjacent row of similar elements, the legs of the Hs of adjacent rows being interdigitated and provided with aligned openings which receive a connecting pin. This arrangement is continued along the length of the chain to whatever extent is desired. Bit carrying lugs are mounted on the H-shaped link elements so as to establish any bit pattern desired. The H-shaped link elements may be provided with bit carrying lugs that are skewed with respect to the direction of chain travel so as to make the chain more efficient. Such link elements may also be provided with load bearing lugs at their sides so as to give increased support for the chain. The arrangement of link elements is such that, in order to shorten the length of the chain to accommodate for slack occasioned by wear, a pair of adjacent rows of H-shaped link elements may be removed and replaced by either appropriately off-set H-shaped link elements and spacers, H-shaped link elements make possible the provision of an unusually sturdy chain requiring only a minimum number of major chain parts so that the mine owner or operator need stock only a relatively small number of parts, both as to type and as to overall quantity.

47172061, Jan 5, 1988

May 2, 1985

6/729570

Lester J. Sterwerf - Harrison OH

The Cincinnati Mine Machinery Company - Cincinnati OH

E21C 2726
E21C 2534

299 82

An endless chain in which there is one row of a plurality of Y-shaped link elements across the width of the chain and an adjacent row of similar elements, the spaced parallel legs of the Ys of one row having the centrally located stem of a Y-shaped link element in an adjacent row interdigitated therewith, the legs and stem being provided with aligned openings which receive a connecting pin. This arrangement is continued along the length of the chain to whatever extent is desired. Any desired widths may be obtained by adding Y-shaped link elements to the rows thereof. Bit carrying lugs are mounted on the Y-shaped link elements so as to establish any bit pattern desired. Some of these bit carrying lugs may be skewed with respect to the direction of chain travel so as to make the chain more efficient. Such link elements may also be provided with load bearing lugs at one or more of the their sides so as to give increased support for the chain. The arrangement of interdigitated, Y-shaped link elements makes possible the provision of an unusually sturdy chain requiring only a minimum number of major chain parts so that the mine owner or operator need stock only a relatively small number of parts, both as to type and as to overall quantity.

46324631, Dec 30, 1986

Aug 3, 1984

6/637319

Lester J. Sterwerf - Harrison OH

The Cincinnati Mine Machinery Company - Cincinnati OH

E21B 1000

299 91

The combined base member and bit holder with protected retainer which comprises this invention includes a bit holder adapted to receive the shank of a suitable cutting bit. The bit holder has a head which permits movement of the bit holder within the base member so as to expose means to receive a retaining member while that portion of the bit holder protrudes beyond the base member. The base member is provided with an opening or recess to receive the retainer so as to prevent accidental dislodgement. After installation of the retainer the bit holder is moved within the base member so as to engage the retainer at least partly in the recess provided in the base member for it, whereafter a spacer is driven between the head of the bit holder and body of the base member to hold the bit holder in place. A boss may be provided on the base member to prevent undue movement of the spacer. Means may also be provided in conjunction with the boss and/or base member to prevent the legs of the spacer from being spread so that the spacer also is prevented from accidental dislodgement.