US3850359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastener driving tool
Assignee: Duo Fast Corp
•
Filing: 1973-05-11
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Granted: 1974-11-26
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Expires: 1993-05-11
Abstract
Abstract A high pressure stud gun or fastener driving tool includes a housing providing a cylinder, a combustion chamber, and a drive track to which studs or fasteners to be driven are supplied. A piston movable in the cylinder actuates a driver slidable in the drive track. A fluid controlled main valve is normally biased by compressed air supplied to a large area valve piston surface to close communication between the combustion chamber and the cylinder. A control assembly on a housing handle supplies a metered charge of combustible material to the chamber and initiates combustion thereof. A small area valve piston surface communicating with the combustion chamber opens the main valve when the gas resulting from combustion reaches a relatively high pressure, and this gas then enters the cylinder to actuate the fastener driver through a power stroke. The control assembly also includes valving for opening and closing the main valve and for purging the combustion chamber and the cylinder of combustion products. The pressure of the compressed air supplied to the large area valve piston surface controls the pressure of the gas admitted to the cylinder, and adjustable regulators on the compressed air source control the driving force applied.
Inventors
- 👤 A Obergfell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:42
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
112 words
A power actuated fastener driving tool comprising a housing having a forward head portion and a rearwardly extending handle portion, a cylinder and a fastener receiving structure included in said head portion, fastener driving means including driver means movable relative to the fastener receiving structure and a driver operating piston slidable within the cylinder, a combustion chamber in the housing, fluid actuated valve means for controlling communication between the cylinder and the chamber to selectively admit gases from the chamber into the cylinder, and manually operable control means on the handle portion of the housing for selectively supplying a combustible mixture to the chamber and controlling the operation of the valve means.
Claim 2
Dependent Claim
112 words
A power actuated fastener driving tool comprising a housing having a forward head portion and a rearwardly extending handle portion, a cylinder and a fastener receiving structure included in said head portion, fastener driving means including driver means movable relative to the fastener receiving structure and a driver operating piston slidable within the cylinder, a combustion chamber in the housing, fluid actuated valve means for controlling communication between the cylinder and the chamber to selectively admit gases from the chamber into the cylinder, and manually operable control means on the handle portion of the housing for selectively supplying a combustible mixture to the chamber and controlling the operation of the valve means.
Claim 3
Dependent Claim
134 words
A power actuated fastener driving tool comprising a housing having a cylinder and a fastener receiving structure, fastener driving means including driver means movable relative to the fastener receiving structure and a driver operating piston slidable within the cylinder, a combustion chamber in the housing, fluid actuated valve means for controlling communication between the cylinder and chamber to selectively admit gases from the chamber into the cylinder, said valve means including a pair of oppositely facing piston surfaces with a first one of the piston surfaces communicating with the combustion chamber, manually operable control means on the housing for selectively supplying a combustible mixture to the chamber, and regulating means coupled to the control means and the second one of the piston surfaces for controlling the pressure of the gases admitted to the cylinder.
Claim 4
Dependent Claim
134 words
A power actuated fastener driving tool comprising a housing having a cylinder and a fastener receiving structure, fastener driving means including driver means movable relative to the fastener receiving structure and a driver operating piston slidable within the cylinder, a combustion chamber in the housing, fluid actuated valve means for controlling communication between the cylinder and chamber to selectively admit gases from the chamber into the cylinder, said valve means including a pair of oppositely facing piston surfaces with a first one of the piston surfaces communicating with the combustion chamber, manually operable control means on the housing for selectively supplying a combustible mixture to the chamber, and regulating means coupled to the control means and the second one of the piston surfaces for controlling the pressure of the gases admitted to the cylinder.
Claim 5
Dependent Claim
60 words
The power actuated fastener driving tool set forth in claim 2 including a source of compressed air, a source of combustible gas, and means for coupling the source of compressed air through the regulating means to the second piston surface and for coupling the source of combustible gas through the regulating means and the control means to the combustion chamber.
Claim 6
Dependent Claim
40 words
The power actuated fastener driving tool set forth in claim 3 in which the regulating means controls the pressure of the compressed air supplied to the piston surface and the pressure of the combustible gas supplied to the combustion chamber.
Claim 7
Dependent Claim
30 words
The power actuated fastener driving tool set forth in claim 3 in which the control means includes means for selectively coupling the source of compressed air to the combustion chamber.
Claim 8
Dependent Claim
198 words
A single stroke tool for driving fasteners comprising a housing defining a cylinder, a piston slidably mounted within the cylinder, a fastener receiving structure, a fastener driver actuated by the piston and movable in the fastener receiving structure, a combustion chamber communicating with the cylinder, a main valve assembly normally in a closed position closing communication between the cylinder and the combustion chamber and movable to an open position placing the combustion chamber in communication with the cylinder, said main valve assembly including a piston portion movable independently of said piston and having a bias surface and an opposed surface in communication with the combustion chamber, fluid biasing means coupled to the bias surface on the piston portion for holding the main valve assembly in its closed position, means supplying a combustible mixture to the combustion chamber, and means for igniting the combustible mixture in the combustion chamber to provide a quantity of high pressure combustion products in the combustion chamber, said products acting on the opposed surface of the piston portion to move the main valve assembly to its open poSition against the bias of the biasing means to permit the combustion products to drive the piston.
Claim 9
Dependent Claim
198 words
A single stroke tool for driving fasteners comprising a housing defining a cylinder, a piston slidably mounted within the cylinder, a fastener receiving structure, a fastener driver actuated by the piston and movable in the fastener receiving structure, a combustion chamber communicating with the cylinder, a main valve assembly normally in a closed position closing communication between the cylinder and the combustion chamber and movable to an open position placing the combustion chamber in communication with the cylinder, said main valve assembly including a piston portion movable independently of said piston and having a bias surface and an opposed surface in communication with the combustion chamber, fluid biasing means coupled to the bias surface on the piston portion for holding the main valve assembly in its closed position, means supplying a combustible mixture to the combustion chamber, and means for igniting the combustible mixture in the combustion chamber to provide a quantity of high pressure combustion products in the combustion chamber, said products acting on the opposed surface of the piston portion to move the main valve assembly to its open poSition against the bias of the biasing means to permit the combustion products to drive the piston.
Claim 10
Dependent Claim
156 words
A power actuated tool comprising a housing including a cylinder and a gas generating chamber communicating with each other, a power output means including a piston movable within the cylinder, valve means movable independently of said piston and having a closed position closing communication between the chamber and the cylinder and an open position placing the chamber and cylinder in communication, piston means controlling movement of the valve means between its open and closed positions, one surface of the piston means communicating with the chamber, biasing means for biasing the piston means to a position moving the valve means to its closed position, and generating means for generating a short duration surge of high pressure gas in the gas generating chamber to move the piston means against the bias applied by the biasing means to move the valve means to its open position to admit the high pressure gas to the cylinder to drive the piston.
Claim 11
Dependent Claim
156 words
A power actuated tool comprising a housing including a cylinder and a gas generating chamber communicating with each other, a power output means including a piston movable within the cylinder, valve means movable independently of said piston and having a closed position closing communication between the chamber and the cylinder and an open position placing the chamber and cylinder in communication, piston means controlling movement of the valve means between its open and closed positions, one surface of the piston means communicating with the chamber, biasing means for biasing the piston means to a position moving the valve means to its closed position, and generating means for generating a short duration surge of high pressure gas in the gas generating chamber to move the piston means against the bias applied by the biasing means to move the valve means to its open position to admit the high pressure gas to the cylinder to drive the piston.
Claim 12
Dependent Claim
30 words
The power actuated tool set forth in claim 7 in which the generating means includes means for supplying a combustible mixture to the chamber and means for igniting the mixture.
Claim 13
Dependent Claim
50 words
The power actuated tool set forth in claim 7 in which the piston means includes a differential piston with a small area piston surface communicating with the chamber and with a large area piston surface, and the biasing means applies a continuous fluid bias to the large area piston surface.
Claim 14
Dependent Claim
25 words
The power actuated tool set forth in claim 7 including fluid control means for opening and closing the valve means independent of the generating means.
Claim 15
Dependent Claim
36 words
The power actuated tool set forth in claim 7 including purging control means operable to open the valve means and to supply a volume of fluid through the chamber and cylinder to purge the gas therefrom.
Claim 16
Dependent Claim
213 words
A power actuated tool comprising a housing having a cylinder and a combustion chamber, a power output unit including a piston slidable in the cylinder, valve means movable between an open position placing the chamber in communication with the cylinder and a closed position in which communication between the chamber and the cylinder is closed, piston means for moving the valve means and including a first piston surface communicating with the combustion chamber for biasing the piston means to move the valve means to its open position, a control valve assembly movable to at least two different settings, said control valve assembly including means operable in a first one of said settings for supplying a combustible material to the combustion chamber, said control valve assembly including means operable in a second one of the settings for biasing the piston means to move the valve means to its closed position, and means for effecting combustion of the material in the combustion chamber with the control valve assembly in its second setting to generate pressurized gas in the combustion chamber to overcome the bias applied to the piston means by the control valve assembly so as to move the valve means to its open position and supply the gas in the chamber to the cylinder.
Claim 17
Dependent Claim
213 words
A power actuated tool comprising a housing having a cylinder and a combustion chamber, a power output unit including a piston slidable in the cylinder, valve means movable between an open position placing the chamber in communication with the cylinder and a closed position in which communication between the chamber and the cylinder is closed, piston means for moving the valve means and including a first piston surface communicating with the combustion chamber for biasing the piston means to move the valve means to its open position, a control valve assembly movable to at least two different settings, said control valve assembly including means operable in a first one of said settings for supplying a combustible material to the combustion chamber, said control valve assembly including means operable in a second one of the settings for biasing the piston means to move the valve means to its closed position, and means for effecting combustion of the material in the combustion chamber with the control valve assembly in its second setting to generate pressurized gas in the combustion chamber to overcome the bias applied to the piston means by the control valve assembly so as to move the valve means to its open position and supply the gas in the chamber to the cylinder.
Claim 18
Dependent Claim
83 words
The power actuated tool set forth in claim 12 in which the housing includes a control cylinder for the piston means, the piston means includes a second piston surface for biasing the piston means to move the valve means to its closed position, said second surface being in the control cylinder, and the control valve assembly includes means operative in the second setting of the control valve assembly for supplying pressurized fluid to the control cylinder to act on the second piston surface.
Claim 19
Dependent Claim
46 words
The power actuated tool set forth in claim 13 including means for adjusting the pressure of the pressurized fluid supplied to the control cylinder to control the pressure of the generated gas supplied to the cylinder when tHe valve means is moved to its open position.
Claim 20
Dependent Claim
29 words
The power actuated tool set forth in claim 13 in which the area of the second piston surface is substantially larger than the area of the first piston surface.
Claim 21
Dependent Claim
50 words
The power actuated tool set forth in claim 12 in which the control valve assembly includes both a combustible gas metering chamber for supplying a given quantity of combustible gas and means for coupling the metering chamber to the combustion chamber in the first setting of the control valve assembly.
Claim 22
Dependent Claim
32 words
The power actuated tool set forth in claim 12 in which the control valve assembly includes means operable to control the piston means to move the valve means to its open position.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |