US4211352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nailing machine
Assignee: Individual
•
Filing: 1979-02-26
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Granted: 1980-07-08
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Expires: 1999-02-26
Abstract
Abstract A pneumatic, linear thrust hand tool, such as a nail driver wherein a charge of pressurized gas in a firing chamber acts, when a main valve is opened, to drive a ram downward. The main valve is opened by a higher pressure source gas entering a charging chamber under a piston carried on the valve stem. Then a control valve is released, the pressurized gas under the piston is delivered to the main cylinder to return the ram and, when the main valve is closed, the pressure in the firing chamber is equalized with that in the charging chamber to prepare it for the next "firing".
Inventors
- 👤 Thomas J. Zilka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:30
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/04; B25C1/041; B25C1/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A pneumatic linear thrust hand tool comprising: a main cylinder; a ram reciprocable in said main cylinder; a firing chamber above said main cylinder; a large main valve operable when opened to bring said main cylinder and said firing chamber into communication; a charging chamber; supply valve means for bringing said charging and firing chambers into communication when said main valve is closed; control valve means operative in one position to connect said charging chamber to a source of pressurized gas; and, a main valve actuator operative in response to flow of gas into said charging chamber to open said main valve.
Claim 2
Dependent Claim
102 words
A pneumatic linear thrust hand tool comprising: a main cylinder; a ram reciprocable in said main cylinder; a firing chamber above said main cylinder; a large main valve operable when opened to bring said main cylinder and said firing chamber into communication; a charging chamber; supply valve means for bringing said charging and firing chambers into communication when said main valve is closed; control valve means operative in one position to connect said charging chamber to a source of pressurized gas; and, a main valve actuator operative in response to flow of gas into said charging chamber to open said main valve.
Claim 3
Dependent Claim
104 words
The pneumatic hand tool defined by claim 1 wherein the said valve actuator comprises: an actuator cylinder contained within said charging chamber; an actuator piston reciprocable in said actuator cylinder; charging ports in said actuator ccylinder opening to the interior of said charging chamber; said charging ports being uncovered by said actuator piston at the outer portion of its stroke; conduit means for delivering pressurized gas to said charging chamber through a port at one end of said actuator cylinder to drive said actuator piston through said stroke; means structurally connecting said actuator piston to said main valve to open same through said stroke.
Claim 4
Dependent Claim
78 words
The pneumatic hand tool defined by claim 2 wherein said last-named means comprises: a passageway interconnecting said charging and firing chambers; a valve stem slidable in said passageway and interconnecting said main valve and said valve actuator piston; a first duct opening from said charging chamber to said passageway; a second duct on said valve stem opening from said passageway to said firing chamber, said first and second ducts being in communication when said main valve is closed.
Claim 5
Dependent Claim
35 words
The pneumatic hand tool defined by claim 2 wherein: said control valve means is operative in a second position to connect said one end of the actuator cylinder to said main cylinder below said ram.
Claim 6
Dependent Claim
30 words
The pneumatic hand tool defined by claim 1 wherein: said control valve member is operative in said second position to connect the said main cylinder above said ram to atmosphere.
Claim 7
Dependent Claim
18 words
The pneumatic hand tool defined by claim 1 including: means for adjusting the size of said charging chamber.
Claim 8
Dependent Claim
42 words
The pneumatic hand tool defined by claim 1 including: a hand-operated trigger operatively associated with said control valve: said control valve being moved to said one position by actuating said trigger; and including: means biasing said control valve towards said other position.
Claim 9
Dependent Claim
111 words
The pneumatic hand tool defined by claim 1 including: a control valve cylinder; said control valve being reciprocable in said cylinder; duct means connecting one end of said cylinder to the source of pressurized fluid and the other end of said cylinder to said charging chamber; said one end of said control valve being smaller in area than said other end so that when pressures therein are substantually equal said control valve will be biased towards said one position but said differential areas can be overcome by pressure differential when said supply valve is opened to bring the pressure of the charging chamber down to the level of said firing chamber.
Claim 10
Dependent Claim
44 words
The pneumatic hand tool defined by claim 1 including: a plunger carried by said ram; a nail guide passage at the lower end of said tool for receiving said plunger; a nail cartridge for feeding a supply of nails to said nail passage way.
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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |