Patent US3584776A successfully refreshed from Google Patents.
US3584776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically actuated stapling tool
Assignee: Individual
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Filing: 1969-09-30
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Granted: 1971-06-15
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Expires: 1989-09-30
Abstract
Abstract In a stapling device in which air under pressure is used both to actuate a piston on a staple driving stroke and to return the piston to its initial position, the piston is held in this position by a magnet which is mounted in a cylinder housing in such a manner that its magnetic field surrounds a portion of the piston when in its initial position.
Inventors
- 👤 Adolf Bolte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:31
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/04; B25C1/047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
In a pneumatically actuated device for driving fasteners into a workpiece having a housing containing a cylinder, a piston reciprocable in said cylinder between an initial position and a driven position, means for admitting air under pressure to said cylinder at one surface of said piston for moving said piston in a driving stroke, means to admit compressed air at the opposite surface of said piston causing said piston to return to its initial position, and magnet means to hold said piston in said initial position; the improvement wherein said magnet means has at least one magnet element disposed in said housing adjacent one end of said cylinder and at the outside of said cylinder for retaining said piston in its initial position without said magnet element being struck by said piston.
Claim 2
Dependent Claim
132 words
In a pneumatically actuated device for driving fasteners into a workpiece having a housing containing a cylinder, a piston reciprocable in said cylinder between an initial position and a driven position, means for admitting air under pressure to said cylinder at one surface of said piston for moving said piston in a driving stroke, means to admit compressed air at the opposite surface of said piston causing said piston to return to its initial position, and magnet means to hold said piston in said initial position; the improvement wherein said magnet means has at least one magnet element disposed in said housing adjacent one end of said cylinder and at the outside of said cylinder for retaining said piston in its initial position without said magnet element being struck by said piston.
Claim 3
Dependent Claim
15 words
The device as claimed in claim 1, wherein said magnet element is annular in shape.
Claim 4
Dependent Claim
20 words
The device as claimed in claim 1, wherein said magnet element is disposed in an annular recess of said housing.
Claim 5
Dependent Claim
40 words
The device as claimed in claim 1, wherein said device further comprises a cover for closing said cylinder and said magnet means includes an annular plate of ferromagnetic material, said magnet element being retained by said cover and said plate.
Claim 6
Dependent Claim
29 words
The device as claimed in claim 4, further comprising an air duct communicating with said end of said cylinder and being disposed between said annular plate and said cover.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |