US3779135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air pressure actuator
Assignee: Individual
•
Filing: 1972-03-20
•
Granted: 1973-12-18
•
Expires: 1992-03-20
Abstract
Abstract An air pressure actuator comprises an air pressure cylinder having a piston slidable therein. A brake is provided at a position where the air pressure cylinder and piston make relative movement, thus stopping their movement. When the movement of the piston in the cylinder is to be halted at a predetermined position, this is effected by the brake so as to constrain the piston correctly relative to the air pressure cylinder. Said brake is formed by an hydraulic cylinder and an hydraulic piston actuated in association with relative movement of the air pressure cylinder and air pressure piston. Alternatively the brake is formed by a retractable braking element housed in the air pressure piston.
Inventors
- 👤 N Sugimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:12
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/06; F15B11/072; F15B11/076; F15B2211/00; F15B2211/30; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/32; F15B2211/327; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/41; F15B2211/413; F15B2211/415; F15B2211/41572; F15B2211/455; F15B2211/46; F15B2211/60; F15B2211/625; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7055; F15B2211/80; F15B2211/885; F15B2211/8855
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
An air pressure actuator comprising an air cylinder having end walls, a piston movably mounted in the air cylinder, means for selectively feeding air under pressure to opposite sides of the piston to reciprocate the piston, a piston rod secured to the piston and having a bore therein which forms a hydraulic cylinder, a second rod secured to one of the end walls of the air cylinder and extending into the hydraulic cylinder, means providing a channel through the second rod and opening to the hydraulic cylinder, and means for stopping flow of hydraulic fluid through the channel to provide an hydraulic brake for the air cylinder.
Claim 2
Dependent Claim
107 words
An air pressure actuator comprising an air cylinder having end walls, a piston movably mounted in the air cylinder, means for selectively feeding air under pressure to opposite sides of the piston to reciprocate the piston, a piston rod secured to the piston and having a bore therein which forms a hydraulic cylinder, a second rod secured to one of the end walls of the air cylinder and extending into the hydraulic cylinder, means providing a channel through the second rod and opening to the hydraulic cylinder, and means for stopping flow of hydraulic fluid through the channel to provide an hydraulic brake for the air cylinder.
Claim 3
Dependent Claim
29 words
The combination of claim 1 wherein the last-mentiOned means includes an accumulator, a conduit leading from the accumulator to the channel, and an hydraulic valve interposed in the conduit.
Claim 4
Dependent Claim
42 words
The combination of claim 2 wherein the means for selectively feeding air under pressure includes an air pressure system, and an air valve interposed in the air pressure system; and including means for simultaneously operating the air valve and the hydraulic valve.
Claim 5
Dependent Claim
32 words
The combination of claim 3 wherein the piston rod extends through the other of the end walls of the air cylinder, and wherein the second rod is coaxial with the piston rod.
Claim 6
Dependent Claim
39 words
The combination of claim 3 wherein the means providing a channel through the second rod provides only one channel, and the hydraulic valve controls flow between the accumulator to the hydraulic cylinder, whereby a single-acting hydraulic brake is provided.
Claim 7
Dependent Claim
92 words
The combination of claim 1 in which the second rod is of smaller cross-section than the hydraulic cylinder, a piston is mounted on the second rod, the means providing a channel includes a first channel opening to the hydraulic cylinder at one side of the piston and a second channel opening to the hydraulic cylinder at the other side of the piston, and the means for stopping flow of hydraulic fluid includes hydraulic valve means for simultaneously stopping flow through both first and second channels, whereby a double-acting hydraulic brake is provided.
Claim 8
Dependent Claim
22 words
The combination of claim 2 in which the air cylinder, hydraulic valve, and accumulator are arranged in series in a longitudinally-extending row.
Claim 9
Dependent Claim
188 words
An air pressure actuator comprising, in combination: an air cylinder having opposite end walls; a piston rod extending through one of the end walls and having one end disposed in the air cylinder; a piston mounted at said one end of the piston rod and separating the air cylinder into first and second air chambers; means for selectively feeding air under pressure to one of the chambers while discharging air from the other chamber, and vice versa, to reciprocate the piston and piston rod; means providing an axial bore extending through the piston and into the piston rod to form an hydraulic cylinder; a second rod secured to the other end wall of the air cylinder and disposed in the hydraulic cylinder; channel means providing at least one channel extending through the second rod from outside the air cylinder and opening to the hydraulic cylinder; a two-piston valve associated with the channel means and operable in one position to permit flow of hydraulic fluid through the channel means and operable in the second position to prevent such flow; and means for operating the valve between its two positions.
Claim 10
Dependent Claim
188 words
An air pressure actuator comprising, in combination: an air cylinder having opposite end walls; a piston rod extending through one of the end walls and having one end disposed in the air cylinder; a piston mounted at said one end of the piston rod and separating the air cylinder into first and second air chambers; means for selectively feeding air under pressure to one of the chambers while discharging air from the other chamber, and vice versa, to reciprocate the piston and piston rod; means providing an axial bore extending through the piston and into the piston rod to form an hydraulic cylinder; a second rod secured to the other end wall of the air cylinder and disposed in the hydraulic cylinder; channel means providing at least one channel extending through the second rod from outside the air cylinder and opening to the hydraulic cylinder; a two-piston valve associated with the channel means and operable in one position to permit flow of hydraulic fluid through the channel means and operable in the second position to prevent such flow; and means for operating the valve between its two positions.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |