Claims
- 1. A lubrication system for the striking bar of a pneumatic rock drill assembly of the type having a non-coaxial drill rotation motor and of the type in which a drill rod is carried by said striking bar which is repeatedly struck by a reciprocating piston and wherein said striking bar is carried for reciprocation by a rotatable bushing connected through a gear train enclosed within a oil flooded gearbox to a pneumatic motor, said gearbox sealed to prevent loss of said oil, said system comprising: a passageway means in said rock drill assembly for directing exhaust air and oil from the pneumatic motor to the outer circumferential periphery of said striking bar to lubricate the lower end thereof.
- 2. The pneumatic rock drill assembly of claim 1 wherein said striking bar is reciprocable within said rotatable bushing by means of a splined connection thereto.
- 3. The pneumatic rock drill assembly of claim 1 wherein said bushing is provided at its upper end with an enlarged diameter area portion which surrounds the upper portion of said striking bar and wherein said exhaust air and oil are directed by said passageway means into said enlarged diameter area portion.
Parent Case Info
This application is a division of application Ser. No. 110,857, filed Jan. 9, 1980 now U.S. Pat. No. 4,340,121.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2748148 |
May 1959 |
DEX |
Divisions (1)
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Number |
Date |
Country |
Parent |
110857 |
Jan 1980 |
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