US3554088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air tool
Assignee: Individual
•
Filing: 1968-11-06
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Granted: 1971-01-12
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Expires: 1988-11-06
Abstract
Abstract An air tool which incorporates a plurality of pistons connected to a common elongated rod, each piston being received within one of a series of aligned cylinders and communicated with a source of pressurized air whereby the pressurized air will act equally upon the multiple pistons and provide for a substantial amplification of the operating force derived from the pressurized air. The two flow paths provided comprise one extending longitudinally through the piston rod itself and the other surrounding the cylinders within a cylinder enclosing housing. Also, with selected ones of the piston receiving cylinders, one way check valves can be provided for enabling the creation of a vacuum upon a forward stroke so as to assist in amplifying the force of the return stroke.
Inventors
- 👤 Charles D Bruyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:14
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/028; F15B11/036; F15B11/0365; B; B21; B21J; B21J15/00; B21J15/10; B21J15/105; B25; B25C; B25C1/00; B25C1/04; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/46; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7055; F15B2211/7056; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53709; Y10T29/53717; Y10T29/53726; Y10T29/5373; Y10T29/53739
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
233 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each pIston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, one of said fluid passage means being defined longitudinally through said piston rod, said rod having laterally directed holes therein communicating the interior fluid passage means with the corresponding chambers, the other of said fluid passage means being defined about said cylinders between the cylinders and the tubular body, and fluid passing holes communicating said other fluid passage means with the corresponding chambers, said elongated piston rod being formed of a plurality of releasably interconnected hollow rod sections, at least the majority of said pistons being mounted between adjacent rod sections, each cylinder being defined by an independent cylindrical wall releasably engageable with the cylindrical walls of the adjoining cylinders so as to define the series of longitudinally aligned cylinders, said tubular body including at least one removable end cap thereon for the introduction of the sectionally constructed rod and cylinders.
Claim 2
Dependent Claim
233 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each pIston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, one of said fluid passage means being defined longitudinally through said piston rod, said rod having laterally directed holes therein communicating the interior fluid passage means with the corresponding chambers, the other of said fluid passage means being defined about said cylinders between the cylinders and the tubular body, and fluid passing holes communicating said other fluid passage means with the corresponding chambers, said elongated piston rod being formed of a plurality of releasably interconnected hollow rod sections, at least the majority of said pistons being mounted between adjacent rod sections, each cylinder being defined by an independent cylindrical wall releasably engageable with the cylindrical walls of the adjoining cylinders so as to define the series of longitudinally aligned cylinders, said tubular body including at least one removable end cap thereon for the introduction of the sectionally constructed rod and cylinders.
Claim 3
Dependent Claim
49 words
The tool of claim 1 wherein each of said rear chambers not communicated with the second fluid passage means is substantially airtight upon forward movement of the piston therein whereby a vacuumlike condition is developed which provides an inherent retracting force on the piston and hence the piston rod.
Claim 4
Dependent Claim
43 words
The tool of claim 2 including a one-way check valve in each of said rear chambers not communicated with the second fluid passage means providing for an exhausting of air in the corresponding rear chamber upon a rearward movement of the corresponding piston.
Claim 5
Dependent Claim
20 words
The tool of claim 3 wherein one of said cylinders is integrally formed with and interiorly within said tubular body.
Claim 6
Dependent Claim
34 words
The tool of claim 4 wherein the fluid passage means through the piston rod comprises the first fluid passage means, and the fluid passage means about the cylinders comprises the second fluid passage means.
Claim 7
Dependent Claim
170 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, said elongated piston rod being formed of a plurality of releasably interconnected hollow rod sections, at least the majority of said pistons being mounted between adjacent rod sections, each cylinder being defined by an independent cylindrical wall releasably engageable with the cylindrical walls of the adjoining cylinders so as to define the series of longitudinally aligned cylinders, said tubular body including at least one removable end cap thereon for the introduction of the sectionally constructed rod and cylinders.
Claim 8
Dependent Claim
170 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, said elongated piston rod being formed of a plurality of releasably interconnected hollow rod sections, at least the majority of said pistons being mounted between adjacent rod sections, each cylinder being defined by an independent cylindrical wall releasably engageable with the cylindrical walls of the adjoining cylinders so as to define the series of longitudinally aligned cylinders, said tubular body including at least one removable end cap thereon for the introduction of the sectionally constructed rod and cylinders.
Claim 9
Dependent Claim
135 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, each of said rear chambers not communicated with the second fluid passage means being substantially airtight upon forward movement of the piston therein whereby a vacuumlike condition is developed which provides an inherent retracting force on the piston and hence the piston rod.
Claim 10
Dependent Claim
135 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, each of said rear chambers not communicated with the second fluid passage means being substantially airtight upon forward movement of the piston therein whereby a vacuumlike condition is developed which provides an inherent retracting force on the piston and hence the piston rod.
Claim 11
Dependent Claim
34 words
The tool of claim 1 wherein the fluid passage means through the piston rod comprises the second fluid passage means, and the fluid passage means about the cylinders comprises the first fluid passage means.
Claim 12
Dependent Claim
20 words
The tool of claim 8 wherein each of said pistons is integrally formed with one of said piston rod sections.
Claim 13
Dependent Claim
60 words
The tool of claim 9 including a one-piece elongated hollow shaft extending through the piston rod sections, said shaft defining an internal airflow passage and having lateral openings therethrough communicating with the interior of said piston rod sections, and means on the opposite ends of said shaft for engagement with the endmost piston rod sections in a section clamping manner.
Claim 14
Dependent Claim
32 words
The tool of claim 10 including an elongated air passage defined through said body parallel to the cylinder receiving interior thereof and communicated with the cylinder receiving interior thereof via lateral openings.
Claim 15
Dependent Claim
172 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending through said cylinders and engaged with said pistons, each piston defining a forward and a rearward chamber in the corresponding cylinder, first airflow means communicated with all of the forward chambers, second airflow means communicated with the rear chambers of a major number os said cylinders, check valve means associated with the rear chambers not communicated with the second airflow means for precluding an introduction of air into said chambers upon a forward movement of the associated pistons whereby a vacuumlike condition is developed therein, and allowing an exhaust of these rear chambers upon a rearward movement of the pistons therein, the pistons in the cylinders having the noncommunicating rear chambers being fixed to the piston rod for forward movement therewith induced by the introduction of pressure through the airflow means communicating with the rear chambers of those cylinders wherein the rear chambers communicate with the second airflow means.
Claim 16
Dependent Claim
172 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending through said cylinders and engaged with said pistons, each piston defining a forward and a rearward chamber in the corresponding cylinder, first airflow means communicated with all of the forward chambers, second airflow means communicated with the rear chambers of a major number os said cylinders, check valve means associated with the rear chambers not communicated with the second airflow means for precluding an introduction of air into said chambers upon a forward movement of the associated pistons whereby a vacuumlike condition is developed therein, and allowing an exhaust of these rear chambers upon a rearward movement of the pistons therein, the pistons in the cylinders having the noncommunicating rear chambers being fixed to the piston rod for forward movement therewith induced by the introduction of pressure through the airflow means communicating with the rear chambers of those cylinders wherein the rear chambers communicate with the second airflow means.
Claim 17
Dependent Claim
17 words
The tool of claim 12 wherein said first airflow means is defined longitudinally through said piston rod.
Claim 18
Dependent Claim
22 words
The tool of claim 12 wherein said second airflow means is defined substantially circumferentially about the cylinders having the communicated rear chambers.
Claim 19
Dependent Claim
68 words
The tool of claim 12 including a pair of cooperating valve units for controlling the flow of air through the first and second airflow means, each valve unit including a pair of spaced valves and spaced valve seats orientated relative to the valves so as to provide for a seating of only one valve at a time, and spring means biasing each valve unit to a predetermined position.
Claim 20
Dependent Claim
43 words
The tool of claim 7 including a one-way check valve in each of said rear chambers not communicated with the second fluid passage means providing for an exhausting of air in the corresponding rear chamber upon a rearward movement of the corresponding piston.
Claim 21
Dependent Claim
36 words
The tool of claim 7 wherein one of said cylinders is integrally formed with and interiorly within said tubular body, the remainder of said cylinders being independent of said tubular body and positioned generally concentrically therewith.
Claim 22
Dependent Claim
123 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, each of said rear chambers not communicated with the second fluid passage Means being substantially airtight upon forward movement of the piston therein whereby a vacuumlike condition is developed which provides an inherent retracting force on the piston and hence the piston rod.
Claim 23
Dependent Claim
123 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, each of said rear chambers not communicated with the second fluid passage Means being substantially airtight upon forward movement of the piston therein whereby a vacuumlike condition is developed which provides an inherent retracting force on the piston and hence the piston rod.
Claim 24
Dependent Claim
43 words
The tool of claim 18 including a one-way check valve in each of said rear chambers not communicated with the second fluid passage means providing for an exhausting of air in the corresponding rear chamber upon a rearward movement of the corresponding piston.
Claim 25
Dependent Claim
169 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, each cylinder being defined by a cylindrical wall formed independently of the walls of the adjoining cylinders, said cylindrical walls being releasably engageable with the cylindrical walls of the adjoining cylinder so as to define the series of longitudinally aligned cylinders, at least one of said cylindrical walls being integrally formed with and interiorly within said tubular body, said tubular body including at least one removable end cap thereon for the introduction of the rod and cylinders.
Claim 26
Dependent Claim
169 words
A force amplifying tool comprising a series of longitudinally aligned cylinders, a piston operatively disposed in each cylinder, an elongated piston rod extending slidably through said cylinders and engaged with said pistons, one end of said rod being adapted to mount a workhead, each piston defining forward and rear chambers in the corresponding cylinder, first fluid passage means communicating with all of the forward chambers, second fluid passage means communicating with at least a major number of the rear chambers, and an elongated tubular body enclosing said cylinders and fluid passage means, each cylinder being defined by a cylindrical wall formed independently of the walls of the adjoining cylinders, said cylindrical walls being releasably engageable with the cylindrical walls of the adjoining cylinder so as to define the series of longitudinally aligned cylinders, at least one of said cylindrical walls being integrally formed with and interiorly within said tubular body, said tubular body including at least one removable end cap thereon for the introduction of the rod and cylinders.
Claim 27
Dependent Claim
44 words
The tool of claim 20 wherein each of said cylindrical walls other than the cylindrical wall integrally formed with the tubular body is formed independently of said tubular body and generally concentrically positioned with regard thereto in alignment with the integrally formed cylindrical wall.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |