Patent US3752040A successfully refreshed from Google Patents.
US3752040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi piston power pack unit for fluid actuated tool
Assignee: Individual
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Filing: 1971-10-26
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Granted: 1973-08-14
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Expires: 1991-10-26
Abstract
Abstract This disclosure is directed to a multi piston, double acting, fluid actuated power pack to power various tools between an operative and inoperative position to attain maximum power with limited displacement of the operating piston. This is attained by a power pack comprising of a housing partitioned to define a plurality of piston chambers and having a piston head reciprocally disposed in each of the chambers. The piston heads are connected to a piston rod which is activated between extended and retracted position as fluid pressure is exerted on the piston heads. Control means in the form of a valve and associated passages are operatively connected to the respective piston chambers for directing the flow of fluid pressure to and from the respective chambers in a manner wherein fluid pressure is applied to each of the piston heads on the power stroke, and on only at least one of the piston heads on the return stroke.
Inventors
- 👤 G Williams
- 👤 J Pawloski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:00
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/028; F15B11/036; F15B11/0365; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7055; F15B2211/7056; F15B2211/77; F15B2211/7716
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
474 words
A fluid actuated, multi-piston power pack applicable for use with a fluid activated tool comprising: a housing defined by opposed end walls and a connected circumscribing wall to define a compartment therein, means partitioning said compartment into a plurality of tandem chambers, piston means including a piston rod and a plurality of spaced piston heads connected thereto for movement therewith between an extended and retracted position, each of said piston heads being displaceably disposed in its respective chambers and dividing the respective chambers into a pair of expandible divisions, said piston rod extending through an opening formed in an end wall of said housing, means defining a fluid inlet formed in the other end wall of said housing, said piston rod having a bore therein which is closed at one end, a conduit rigidly secured to said housing and spatially disposed within said bore to define a first annular passage in the space therebetween, said conduit opening to said bore to define a second passage nested within said first passage, a sealing means circumscribing said conduit intermediate the length thereof to seal the first passage from said second passage, a pair of ports formed in said piston rod, said pair of ports being disposed so that one of said pair of ports is disposed on opposite sides of said sealing means so as to communicate the complementary divisions of one of said chambers with said first and second passages respectively, a valving means interposed in said housing between said first and second passages and said housing inlet means, said valving means including a valve body having a fluid inlet adapted to be disposed in communication with said housing inlet and a duct opening leading to the outside of said housing, said valve body including a first port and a second port, said first port being disposed in communication with said first passage, and said second port being disposed within said second passage, a valve member disposed in said valve body for valving said first and second ports, said valve member including a valve stem and a pair of valve heads spaced thereon, said stem being positioned within said duct opening, said stem having a bore extending therein, said stem having ports formed in the upper end thereof, said stem ports venting to the atmosphere through said duct opening, said stem bore being adapted to be disposed in communication with said first passage for said one chamber in the return stroke of said pistons, a spring disposed in the bore of said stem to normally bias said stem toward an inoperative position, and a port formed on the wall of the other piston chamber to vent said other chamber to atmosphere, and a valve handle abutting the end of said valve stem to effect displacement of said valve stem against the bias of said spring.
Claim 2
Dependent Claim
474 words
A fluid actuated, multi-piston power pack applicable for use with a fluid activated tool comprising: a housing defined by opposed end walls and a connected circumscribing wall to define a compartment therein, means partitioning said compartment into a plurality of tandem chambers, piston means including a piston rod and a plurality of spaced piston heads connected thereto for movement therewith between an extended and retracted position, each of said piston heads being displaceably disposed in its respective chambers and dividing the respective chambers into a pair of expandible divisions, said piston rod extending through an opening formed in an end wall of said housing, means defining a fluid inlet formed in the other end wall of said housing, said piston rod having a bore therein which is closed at one end, a conduit rigidly secured to said housing and spatially disposed within said bore to define a first annular passage in the space therebetween, said conduit opening to said bore to define a second passage nested within said first passage, a sealing means circumscribing said conduit intermediate the length thereof to seal the first passage from said second passage, a pair of ports formed in said piston rod, said pair of ports being disposed so that one of said pair of ports is disposed on opposite sides of said sealing means so as to communicate the complementary divisions of one of said chambers with said first and second passages respectively, a valving means interposed in said housing between said first and second passages and said housing inlet means, said valving means including a valve body having a fluid inlet adapted to be disposed in communication with said housing inlet and a duct opening leading to the outside of said housing, said valve body including a first port and a second port, said first port being disposed in communication with said first passage, and said second port being disposed within said second passage, a valve member disposed in said valve body for valving said first and second ports, said valve member including a valve stem and a pair of valve heads spaced thereon, said stem being positioned within said duct opening, said stem having a bore extending therein, said stem having ports formed in the upper end thereof, said stem ports venting to the atmosphere through said duct opening, said stem bore being adapted to be disposed in communication with said first passage for said one chamber in the return stroke of said pistons, a spring disposed in the bore of said stem to normally bias said stem toward an inoperative position, and a port formed on the wall of the other piston chamber to vent said other chamber to atmosphere, and a valve handle abutting the end of said valve stem to effect displacement of said valve stem against the bias of said spring.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |