Resilient connection for mining pick and bushing

Claim 2

In combination, a bit block having an axial bore therethrough, a bushing mounted in said block, said bushing having a wall forming a longitudinal opening, a bit having a shank received in said longitudinal opening, a circumferential groove in said shank, said bit block having a transverse opening therein open to and tangential to said bore, said transverse opening extending into said bit block on two sides of said bore, said bushing having an opening through its wall mating with said circumferential groove and said transverse opening, a keeper, said keeper having a body portion closely received in said transverse opening on both sides of said bore and in said bushing wall opening and a protuberance extending into said circumferential groove whereby said bushing is held from rotation and axial movement and whereby said bit is held from axial movement but not from rotation thereof.

Claim 3

The combination of claim 1 in which said bushing has an outwardly extending flange at its forward end forming a shoulder bearing against the forward end face of said block.

Claim 4

The combination of claim 1 in which the axis of said longitudinal opening is offset with respect to the outside diameter of said bushing so that the wall thickness varies around the periphery of said bushing, said bushing wall opening being in the wall portion having the minimum thickness.

Claim 5

The combination of claim 3 in which said bushing has an outwardly extending flange at its forward end forming a shoulder bearing against the forward end face of said block.

Claim 6

The combination of claim 1 in which said keeper is depressible an amount sufficient to permit said protuberance to be displaced from said groove.

Claim 7

The combination of claim 5 in which said keeper has a metal pin embedded in said protuberance and in which a substantial part of said protuberance and said body portion is of a compressible material, said pin extending only a portion of the length of said protuberance and having compressible material surrounding substantially all of its peripheral surface and ends.

Claim 8

The combination of claim 6 in which a substantial part of said protuberance and body portion is rubber, and said keeper includes a metal casing covering a part of the periphery of said body portion, and in which said pin and said casing are firmly adhered to said rubber.

Claim 9

The combination of claim 5 in which said transverse opening is cylindrical in shape with its axis parallel to a tangent of said bore, and said bushing wall opening has cylindrical surfaces having a radius equal to the radius of said transverse opening, and said body portion of said keeper has a cylindrical shape simiLar to said transverse opening.

Claim 10

In combination, a bit block having an axial bore therethrough, a bit having a shank received in said bore, a groove in said shank, said block having a transverse opening therein open to and tangential to said bore and extending into said bit block on two sides of said bore, said opening mating with said groove, a keeper, said keeper having a body portion closely received in said transverse opening and a protuberance extending into said groove whereby said bit is held from axial movement thereof, a substantial part of said body portion and said protuberance being of a compressible material, said protuberance having a metal pin of less length than said protuberance embedded therein in the area in which said protuberance extends into said groove, said pin having its axis parallel to the axis of said body portion, said pin being substantially completely surrounded by and firmly adhered to said compressible material, said pin being depressible from said groove.

Claim 11

In combination, a bit block having an axial bore therethrough, a bit having a shank received in said bore, a groove in said shank, said block having a transverse opening therein open to and tangential to said bore and extending into said bit block on two sides of said bore, said opening mating with said groove, a keeper, said keeper having a body portion closely received in said transverse opening and a protuberance extending into said groove whereby said bit is held from axial movement thereof, a substantial part of said body portion and said protuberance being of a compressible material, said protuberance having a metal pin of less length than said protuberance embedded therein in the area in which said protuberance extends into said groove, said pin having its axis parallel to the axis of said body portion, said pin being substantially completely surrounded by and firmly adhered to said compressible material, said pin being depressible from said groove.

Claim 12

The combination of claim 9 in which a substantial part of said protuberance and body portion is rubber, and said keeper includes a metal casing covering a part of the periphery of said body portion, and in which said pin and said casing are firmly adhered to said rubber.

Claim 13

A keeper comprising a generally cylindrical body portion, a substantial part of said body portion being of a compressible material, a protuberance extending from said body portion, a substantial part of said protuberance being of a compressible material, a metal pin of less length than said protuberance with compressible material bonded to each end of said pin and substantially all of its periphery embedded in said protuberance and in said body portion, said metal pin having its axis parallel to the axis of said body portion, a metal casing covering a part of the periphery of said body portion, said pin and said casing being firmly adhered to said compressible material.

Claim 14

A keeper comprising a generally cylindrical body portion, a substantial part of said body portion being of a compressible material, a protuberance extending from said body portion, a substantial part of said protuberance being of a compressible material, a metal pin of less length than said protuberance with compressible material bonded to each end of said pin and substantially all of its periphery embedded in said protuberance and in said body portion, said metal pin having its axis parallel to the axis of said body portion, a metal casing covering a part of the periphery of said body portion, said pin and said casing being firmly adhered to said compressible material.