Fastener driving tool
Abstract
Abstract THE APPLICATION DISCLOSES A PNEUMATIC FASTENER DRIVING TOOL HAVING A BLADE ACTUATING PISTON WITH AN UPPER, GREATER DIAMETER PORTION SPACED FROM A LOWER, LESSER DIAMETER PORTION BY A RECESSED AREA FORMING AN AIR RETURN SPACE CONTINUOUSLY SUPPLIED WITH COMPRESSED AIR TO HOLD THE PISTON IN A NORMAL POSITION. THE DIFFERENT DIAMETER PORTIONS OF THE PISTON ARE SLIDABLE IN CORRESPONDING DIAMETER PORTIONS OF A CYLINDER, AND RESILIENT O-RING ON THE UPPER END OF THE LESSER DIAMETER PORTION OF THE CYLINDER SEALS AGAINST THE LESSER DIAMETER PISTON PORTION IN THE NORMAL POSITION OF THE PISTON TO SEAL THE AIR RETURN SPACE FROM THE LOWER END OF THE CYLINDER. THE LESSER DIAMETER PISTON PORTION CARRIES A NYLON BEARING WHICH GUIDES PISTON MOVEMENT BUT PERMITS AIR FROM THE RETURN SPACE TO BLOW BY INTO THE LOWER END OF THE CYLINDER WHEN THE PISTON IS MOVED OUT OF ITS NORMAL POSITION DURING A DRIVING AND RETURN STROKE.
Inventors
- 👤 Richard H Doyle
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |