Threaded connector for impact devices

Claim 2

In percussive drilling apparatus: a first impact member adapted to receive an impact blow; means for delivering repeated impact blows to said first impact member; a second impact member having means engaging the first impact member to receive the blow from the first impact member; and connecting means for threadedly securing said members to each other comprising a box having internal threads, a pin within said box and having external threads conforming to said internal threads, and a malleable sleeve between said pin and box threads in intimate contact with said pin and box threads to transmit load therebetween.

Claim 3

In drilling apparatus as defined in claim 1; said pin and box threads being straight threads.

Claim 4

In drilling apparatus as defined in claim 1; said pin and box threads being straight threads of divided pitch.

Claim 5

In drilling apparatus as defined in claim 1; the material of said malleable sleeve being copper.

Claim 6

In drilling apparatus as defined in claim 1; said malleable sleeve being a plating on at least one of said pin and box threads.

Claim 7

In drilling apparatus as defined in claim 1; said pin and box threads being straight threads; the material of said malleable sleeve being copper.

Claim 8

In percussive drilling apparatus: an anvil member adapted to receive an impact blow; means for delivering repeated impact blows to said anvil member; a bit member having means engaging said anvil member to receive the blow therefrom; said bit member having an end face for impacting against the bottom of a bore hole; and a threaded connection between said anvil and bit members comprising a box on one of said members having internal threads, a pin on the other of said members within said box and having external threads conforming to said internal threads, and a malleable sleeve between said pin and box threads in intimate contact with said pin and box threads to transmit load therebetween.

Claim 9

In percussive drilling apparatus: an anvil member adapted to receive an impact blow; means for delivering repeated impact blows to said anvil member; a bit member having means engaging said anvil member to receive the blow therefrom; said bit member having an end face for impacting against the bottom of a bore hole; and a threaded connection between said anvil and bit members comprising a box on one of said members having internal threads, a pin on the other of said members within said box and having external threads conforming to said internal threads, and a malleable sleeve between said pin and box threads in intimate contact with said pin and box threads to transmit load therebetween.

Claim 10

In drilling apparatus as defined in claim 7; said pin and box threads being straight threads.

Claim 11

In drilling apparatus as defined in claim 7; said pin and box threads being straight threads of divided pitch.

Claim 12

In drilling apparatus as defined in claim 7; said box being on said bit member and said pin being on said anvil member.

Claim 13

In drilling apparatus as defined in claim 7; said box being on said bit member and said pin being on said anvil member; said pin and box threads being straight threads.

Claim 14

In drilling apparatus as defined in claim 7; said box being on said bit member and said pin being on said anvil member; the engagement between said anvil and bit members being between the lower end of said anvil member and the lower end of said box.

Claim 15

In drilling apparatus as defined in claim 7; the material of said malleable sleeve being copper.

Claim 16

In percussive drilling apparatus: a first rod member adapted to receive an impact blow; means for delivering repeated impact blows to said first rod member; a second rod member in endwise engagement with said first rod member to receive the blow therefrom; and connecting means securing said members together comprising a coupling sleeve having internal threads and surrounding the adjacent portions of said members, said adjacent portions having external threads conforming to the internal threads of said coupling sleeve, and malleable sleeve means between and in intimate contact with said internal threads and the external threads of said adjacent portions to transmit load therebetween.

Claim 17

In percussive drilling apparatus: a first rod member adapted to receive an impact blow; means for delivering repeated impact blows to said first rod member; a second rod member in endwise engagement with said first rod member to receive the blow therefrom; and connecting means securing said members together comprising a coupling sleeve having internal threads and surrounding the adjacent portions of said members, said adjacent portions having external threads conforming to the internal threads of said coupling sleeve, and malleable sleeve means between and in intimate contact with said internal threads and the external threads of said adjacent portions to transmit load therebetween.

Claim 18

In drilling apparatus as defined in claim 14; said internal and external threads being straight threads.

Claim 19

In drilling apparatus as defined in claim 14; said internal and external threads being straight threads; the material of said malleable sleeve means being copper.

Claim 20

In drilling apparatus as defined in claim 14; said internal and external threads being straight threads; said malleable sleeve means being a plating on at least one of said internal and external threads.

Claim 21

A percussive drill bit having a thread portion adapted to be threadedly secured to an impact anvil, said bit having an end face for impacting against the bottom of a bore hole and a face adapted to be engaged by the impact anvil to receive blows therefrom, and a malleable sleeve on said thread portion in intimate surface contact with the threads of such portion.

Claim 22

A percussive drill bit having a thread portion adapted to be threadedly secured to an impact anvil, said bit having an end face for impacting against the bottom of a bore hole and a face adapted to be engaged by the impact anvil to receive blows therefrom, and a malleable sleeve on said thread portion in intimate surface contact with the threads of such portion.

Claim 23

A percussive drill bit as defined in claim 18; said thread portion being an internal thread portion.

Claim 24

A percussive drill bit as defined in claim 18; said malleable sleeve being a copper sleeve.

Claim 25

A percussive drill bit as defined in claim 18; said thread portion being an internal portion; said malleable sleeve being a copper sleeve.