US3776445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic fastener driving device
Assignee: Omark Industries Inc
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Filing: 1972-08-24
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Granted: 1973-12-04
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Expires: 1992-08-24
Abstract
Abstract A pneumatic fastener driving device wherein a cylinder houses a piston that is adapted to be driven therethrough by air pressure. A driving blade connected to the piston extends through the cylinder and strikes a fastener, e.g., a nail. A buffer in the bottom of the cylinder cushions the impact of the piston upon reaching the end of its stroke. A chamber surrounding the cylinder is supplied with air pressure during the downward stroke of the piston which is released at the end of the stroke against the bottom side of the piston to return it to its starting position. An air deflecting collar protects the buffer by deflecting air from the chamber away from the buffer and against the bottom of the cylinder.
Inventors
- 👤 R Pomeroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:49
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/04; B25C1/041
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
263 words
A pneumatic fastener driving device comprising: a head assembly, a cylindrical chamber in said head assembly, a piston movable in the cylindrical chamber from a starting position at one end of the chamber toward the other end, a driving blade fastened to one side of the piston for extending toward and through said other end of the cylindrical chamber with movement of the piston, fastener feeding means for feeding fasteners into the path of the driving blade to be driven by the Driving blade into a work surface, means for supplying air pressure to said cylindrical chamber on the side of the piston opposite the driving blade when said piston is in its starting position, an air control valve controlling air pressure from the air pressure supply means into the cylindrical chamber, a chamber within the head assembly surrounding the cylindrical chamber, a shock absorbing buffer in the cylindrical chamber at said other end to limit the stroke of the piston and to absorb the impact of the piston upon reaching that limit, openings between the surrounding chamber and the cylindrical chamber adjacent the buffer whereby driving of the piston forces air into the surrounding chamber creating therein a positive pressure, means for evacuating the air pressure from the air pressure inlet side of the piston whereby air pressure in the surrounding chamber is directed back through the openings to return the piston to its starting position, and the improvement which comprises a rigid protective shield between the buffer and the openings to deflect the air from the buffer and toward the piston.
Claim 2
Dependent Claim
263 words
A pneumatic fastener driving device comprising: a head assembly, a cylindrical chamber in said head assembly, a piston movable in the cylindrical chamber from a starting position at one end of the chamber toward the other end, a driving blade fastened to one side of the piston for extending toward and through said other end of the cylindrical chamber with movement of the piston, fastener feeding means for feeding fasteners into the path of the driving blade to be driven by the Driving blade into a work surface, means for supplying air pressure to said cylindrical chamber on the side of the piston opposite the driving blade when said piston is in its starting position, an air control valve controlling air pressure from the air pressure supply means into the cylindrical chamber, a chamber within the head assembly surrounding the cylindrical chamber, a shock absorbing buffer in the cylindrical chamber at said other end to limit the stroke of the piston and to absorb the impact of the piston upon reaching that limit, openings between the surrounding chamber and the cylindrical chamber adjacent the buffer whereby driving of the piston forces air into the surrounding chamber creating therein a positive pressure, means for evacuating the air pressure from the air pressure inlet side of the piston whereby air pressure in the surrounding chamber is directed back through the openings to return the piston to its starting position, and the improvement which comprises a rigid protective shield between the buffer and the openings to deflect the air from the buffer and toward the piston.
Claim 3
Dependent Claim
35 words
A pneumatic fastener driving device as defined in claim 1 wherein the buffer is elastomeric and frusto-conical in form, and the protective shield is a metal rigid ring surrounding the base of the frusto-conical buffer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |