| |
 |
William I. Wohlfeld Patents |
|
Inventor: Wohlfeld; William I.
Address: Midland, TX
No. of patents: 3
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 5372548 |
Longitudinal and rotary shock absorber for rotary and percussion drill bits |
December 13, 1994 |
| A longitudinal and rotary vibration dampener or shock absorber for rotary and percussion drill bits comprises a resilient element to absorb axial compression loads, preferably in a compression mode; a resilient element to absorb axial tension loads, preferably in a compression mode; resi |
| 4079793 |
Exhaust means for percussion tools |
March 21, 1978 |
| In one type of pneumatic percussion drilling tool, the pneumatic motor has an anvil-bit which is slidable in the forward end of the motor casing between a normal working position and an abnormal advanced position when the tool is hanging off bottom and the pneumatic fluid is caused to by |
| 4016944 |
Pneumatic hammer-auger earth boring apparatus |
April 12, 1977 |
| An improved earth boring apparatus for soft, hard, and heterogenous formations utilizes a pneumatic hammer combined with an earth boring auger. The pneumatic hammer is supported inside a hollow case of the auger and has a small pilot bit and a large rigid bit plate having the same di |
|
|
|
