US3726191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically controlled hydraulic system and transducer therefor
Assignee: Amphenol Corp
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Filing: 1971-02-08
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Granted: 1973-04-10
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Expires: 1991-02-08
Abstract
Abstract Hydraulic system in which the application of fluid to a cylinder is controlled electrically by circuitry connected to an elongated resistance element mounted within a hydraulic cylinder and to a slider contact carried by a piston within the cylinder. The resistance element is part of a first assembly supported from one end of the cylinder and extending within a passage within a piston rod and is wound on and connected at a first end to a metal rod disposed in a longitudinal slot of an insulating support. A second metal rod is in a diametrically opposed slot and is engaged by a second slider contact, the contacts being part of a second assembly and being at the ends of resilient arms supported within the tubular insulating member which is mounted within the open end of the piston rod passage. Terminal means are connected to the metal rods and to a second end of the resistance element at one end of the first assembly which is at one end of the hydraulic cylinder.
Inventors
- 👤 S Johnston
- 👤 H Riedmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:59
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/28; F15B15/2815; F15B15/2853
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
In a hydraulic system including a cylinder and a piston reciprocable in said cylinder, an elongated resistance element within said cylinder, a contact element within said cylinder engaged with said resistance element, first support means supporting one of said elements from said cylinder, second support means supporting the other of said elemenTs from said piston for relative longitudinal movement of said contact element along said resistance element in response to movement of said piston in said cylinder, first and second electrical terminal means accessible from outside said cylinder, first and second electrical connection means from said terminal means to said contact element and to one end of said resistance element, said first support means comprising a member of insulating material supported from one end of said cylinder and disposed centrally in said cylinder, said elongated resistance element being supported by said member of insulating material in a central region of said cylinder along the axis thereof,an elongated conductive member supported by said member of insulating material in said central region of said cylinder and along said axis thereof in spaced parallel relation to said elongated resistance element, and a second contact element engaged with said elongated conductive member and electrically connected to said first contact element.
Claim 2
Dependent Claim
206 words
In a hydraulic system including a cylinder and a piston reciprocable in said cylinder, an elongated resistance element within said cylinder, a contact element within said cylinder engaged with said resistance element, first support means supporting one of said elements from said cylinder, second support means supporting the other of said elemenTs from said piston for relative longitudinal movement of said contact element along said resistance element in response to movement of said piston in said cylinder, first and second electrical terminal means accessible from outside said cylinder, first and second electrical connection means from said terminal means to said contact element and to one end of said resistance element, said first support means comprising a member of insulating material supported from one end of said cylinder and disposed centrally in said cylinder, said elongated resistance element being supported by said member of insulating material in a central region of said cylinder along the axis thereof,an elongated conductive member supported by said member of insulating material in said central region of said cylinder and along said axis thereof in spaced parallel relation to said elongated resistance element, and a second contact element engaged with said elongated conductive member and electrically connected to said first contact element.
Claim 3
Dependent Claim
39 words
In a system as defined in claim 1, saidmember of insulating material being an elongated member extending along the axis of said cylinder, said resistance element and said elongated conductive member being supported along said member of insulating material.
Claim 4
Dependent Claim
27 words
In a system as defined in claim 2, said resistance element and said elongated conductive member being supported along opposite sides of said member of insulating material.
Claim 5
Dependent Claim
30 words
In a system as defined in claim 3, said member of insulating material having a pair of diametrically opposed longitudinal slots receiving said resistance element and said elongated conductive member.
Claim 6
Dependent Claim
44 words
In a system as defined in claim 1, a piston rod connected at one end to said piston, said piston rod having an internal passage opened at one end thereof with said elongated resistance element and said elongated conductive member extending into said passage.
Claim 7
Dependent Claim
36 words
In a system as defined in claim 5, a generally tubular member of insulating material disposed in said passage adjacent said opened end thereof, and support means supporting said contact elements from said generally tubular member.
Claim 8
Dependent Claim
17 words
In a system as defined in claim 6, said support means comprising a pair of resilient arms.
Claim 9
Dependent Claim
75 words
In a system as defined in claim 7, a second elongated conductive member supporting said elongated resistance element, insulating means insulating said resistance element from said second conductive member along the length thereof, means electrically connecting one end of said resistance element to the adjacent end of said second conductive member, third terminal means accessible from outside said cylinder, and third electrical connection means from said third terminal means to said second elongated conductive member.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |