US4342634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuity spring for a hydraulic cylinder
Assignee: Brunswick Corp
•
Filing: 1979-12-26
•
Granted: 1982-08-03
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Expires: 1999-12-26
Abstract
Abstract A continuity spring (27) is provided to make electrical contact between the cylinder (13) and piston rod (14) of a hydraulic piston-cylinder (10). The spring (27) is mounted in an annular groove (28) in the end cap (15) of the cylinder. A straight section (29) of the spring (27) contacts both the cylinder (13) and the piston rod (14) to establish electrical contact between the piston rod (14) and a cathodic protection system (25).
Inventors
- 👤 William D. Haasl
- 👤 Robert B. Weronke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:56
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
In a hydraulic piston-cylinder for marine applications, of the type having a metal cylinder with closed ends, a piston slidably mounted in said cylinder, and a metal piston rod attached to one end of said piston and extending out one end of said cylinder, and wherein said piston rod is electrically insulated from said cylinder, the improvement comprising: a sliding metal contact mounted between said piston rod and said cylinder to assure electrical contact therebetween as said piston rod reciprocates.
Claim 2
Dependent Claim
80 words
In a hydraulic piston-cylinder for marine applications, of the type having a metal cylinder with closed ends, a piston slidably mounted in said cylinder, and a metal piston rod attached to one end of said piston and extending out one end of said cylinder, and wherein said piston rod is electrically insulated from said cylinder, the improvement comprising: a sliding metal contact mounted between said piston rod and said cylinder to assure electrical contact therebetween as said piston rod reciprocates.
Claim 3
Dependent Claim
24 words
The device defined in claim 1 wherein said sliding metal contact comprises a spring to assure contact between said piston rod and said cylinder.
Claim 4
Dependent Claim
21 words
The device defined in claim 2 further comprising a slot in said cylinder and said spring is mounted in said slot.
Claim 5
Dependent Claim
26 words
The device defined in claim 3 wherein said slot is larger than said spring, whereby said spring moves in said slot as said piston rod reciprocates.
Claim 6
Dependent Claim
15 words
The device defined in claim 4 wherein said spring is formed of a wire section.
Claim 7
Dependent Claim
16 words
The device defined in claim 5 wherein said slot is annular and surrounds said piston rod.
Claim 8
Dependent Claim
28 words
The device defined in claim 6 wherein said spring comprises a portion having its ends in contact with said cylinder and its middle in contact with said rod.
Claim 9
Dependent Claim
14 words
The device defined in claim 7 wherein said spring partially encircles said piston rod.
Claim 10
Dependent Claim
20 words
The device defined in claim 8 wherein said spring has two arc portions on each side of said straight portion.
Claim 11
Dependent Claim
20 words
The device defined in claim 9 wherein said arc portions are of approximately the same diameter as said annular slot.
Claim 12
Dependent Claim
30 words
The device defined in claim 10 wherein said piston rod is formed of stainless steel, said cylinder is formed of aluminum, and said spring is formed of brass or bronze.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |