US4564048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure accumulator with composite helical spring
Assignee: Tayco Developments Inc
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Filing: 1984-05-25
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Granted: 1986-01-14
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Expires: 2004-05-25
Abstract
Abstract A pressure accumulator including a plastic cylinder having first and second cylinder ends, a piston in the cylinder, a bore in the first cylinder end, a piston rod attached to the piston and extending through the bore, a cylinder cap at the second end, a fluid inlet at the second cylinder end for conducting fluid into the cylinder, an external portion on the piston rod located outside of the cylinder, and a composite helical spring encircling the cylinder and having a first end attached proximate the cap and a second end attached to the external portion of the piston rod.
Inventors
- 👤 Paul H. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:25
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/04; F15B2201/00; F15B2201/20; F15B2201/21; F15B2201/30; F15B2201/31; F15B2201/312; F15B2201/40; F15B2201/41
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
111 words
A pressure accumulator comprising a cylinder having first and second cylinder ends, a piston in said cylinder, a bore in said first cylinder end, a piston rod attached to said piston and extending through said bore, a fluid inlet at said second cylinder end for conducting fluid into said cylinder, an external portion on said piston rod located outside of said cylinder, a helical spring encircling said cylinder, first and second spring ends on said helical spring, first attachment means fixedly coupling said first spring end to said external portion of said piston rod, and second attachment means coupling said second spring end to said cylinder remote from said first end.
Claim 2
Dependent Claim
111 words
A pressure accumulator comprising a cylinder having first and second cylinder ends, a piston in said cylinder, a bore in said first cylinder end, a piston rod attached to said piston and extending through said bore, a fluid inlet at said second cylinder end for conducting fluid into said cylinder, an external portion on said piston rod located outside of said cylinder, a helical spring encircling said cylinder, first and second spring ends on said helical spring, first attachment means fixedly coupling said first spring end to said external portion of said piston rod, and second attachment means coupling said second spring end to said cylinder remote from said first end.
Claim 3
Dependent Claim
18 words
A pressure accumulator as set forth in claim 1 including a cap for closing said second cylinder end.
Claim 4
Dependent Claim
17 words
A pressure accumulator as set forth in claim 2 wherein said fluid inlet extends through said cap.
Claim 5
Dependent Claim
25 words
A pressure accumulator as set forth in claim 2 wherein said second attachment means comprise ridges on said cap for receiving said second spring end.
Claim 6
Dependent Claim
30 words
A pressure accumulator as set forth in claim 2 including bracket means for attaching said cylinder to an external object, and securing means securing said bracket means to said cap.
Claim 7
Dependent Claim
23 words
A pressure accumulator as set forth in claim 5 wherein said securing means comprise a threaded connection between said bracket and said cap.
Claim 8
Dependent Claim
49 words
A pressure accumulator as set forth in claim 6 wherein said cap includes a plug portion which fits into said cylinder, and wherein said cylinder includes a cylinder shoulder at said second cylinder end, and wherein said cap includes a cap shoulder in abutting relationship with said cylinder shoulder.
Claim 9
Dependent Claim
19 words
A pressure accumulator as set forth in claim 7 including seal means between said plug portion and said cylinder.
Claim 10
Dependent Claim
22 words
A pressure accumulator as set forth in claim 6 including a second threaded connection between said second cylinder end and said bracket.
Claim 11
Dependent Claim
25 words
A pressure accumulator as set forth in claim 9 wherein said second attachment means comprises ridges on said bracket for receiving said second spring end.
Claim 12
Dependent Claim
26 words
A pressure accumulator as set forth in claim 10 wherein said ridges comprise a helical thread for receiving said second spring end of said helical spring.
Claim 13
Dependent Claim
26 words
A pressure accumulator as set forth in claim 4 wherein said ridges comprise a helical thread for receiving said second spring end of said helical spring.
Claim 14
Dependent Claim
49 words
A pressure accumulator as set forth in claim 2 wherein said cap includes a plug portion which fits into said cylinder, and wherein said cylinder includes a cylinder shoulder at said second cylinder end, and wherein said cap includes a cap shoulder in abutting relationship with said cylinder shoulder.
Claim 15
Dependent Claim
24 words
A pressure accumulator as set forth in claim 13 including key attachment means for providing a non-rotational fit between said cylinder and said cap.
Claim 16
Dependent Claim
38 words
A pressure accumulator as set forth in claim 14 wherein said key means comprise at least one protuberance on said cap and at least one recess at said second cylinder end for receiving said at least one protuberance.
Claim 17
Dependent Claim
75 words
A pressure accumulator as set forth in claim 15 wherein said second attachment means includes a helical thread on said second cylinder end, helical thread portions on said at least one protuberance in alignment with portions of said helical thread, and wherein said second spring end is mounted on said helical thread and on said helical thread portions and thus provides shear connections between adjacent portions of said helical thread and said helical thread portions.
Claim 18
Dependent Claim
16 words
A pressure accumulator as set forth in claim 1 wherein said cylinder is fabricated from plastic.
Claim 19
Dependent Claim
27 words
A pressure accumulator as set forth in claim 17 including seal means formed integrally with said cylinder at said first cylinder end for receiving said piston rod.
Claim 20
Dependent Claim
18 words
A pressure accumulator as set forth in claim 18 including a cap for closing said second cylinder end.
Claim 21
Dependent Claim
49 words
A pressure accumulator as set forth in claim 19 wherein said cap includes a plug portion which fits into said cylinder, and wherein said cylinder includes a cylinder shoulder at said second cylinder end, and wherein said cap includes a cap shoulder in abutting relationship with said cylinder shoulder.
Claim 22
Dependent Claim
17 words
A pressure accumulator as set forth in claim 20 wherein said fluid inlet extends through said cap.
Claim 23
Dependent Claim
30 words
A pressure accumulator as set forth in claim 18 including bore means in said piston rod for effecting communication between said cylinder and said external portion of said piston rod.
Claim 24
Dependent Claim
33 words
A pressure accumulator as set forth in claim 1 wherein said helical spring is fabricated from material having a higher strength than a plastic resin and a lower modulus of elasticity than steel.
Claim 25
Dependent Claim
23 words
A pressure accumulator as set forth in claim 23 wherein said material is a composite of a plastic resin and high strength fibers.
Claim 26
Dependent Claim
119 words
A pressure accumulator comprising a cylinder having first and second cylinder ends, a piston in said cylinder, a bore in said first cylinder end, a piston rod attached to said piston and extending through said bore, a fluid inlet at said second cylinder end, an external portion on said piston rod located outside of said cylinder, a composite spring of plastic resin and high strength fibers having first and second spring ends, first attachment means attaching said first spring end relative to said cylinder, and second attachment means attaching said second spring end to said external portion of said piston rod, said composite spring having a lower modulus of elasticity than steel and a higher strength than plastic resin.
Claim 27
Dependent Claim
119 words
A pressure accumulator comprising a cylinder having first and second cylinder ends, a piston in said cylinder, a bore in said first cylinder end, a piston rod attached to said piston and extending through said bore, a fluid inlet at said second cylinder end, an external portion on said piston rod located outside of said cylinder, a composite spring of plastic resin and high strength fibers having first and second spring ends, first attachment means attaching said first spring end relative to said cylinder, and second attachment means attaching said second spring end to said external portion of said piston rod, said composite spring having a lower modulus of elasticity than steel and a higher strength than plastic resin.
Claim 28
Dependent Claim
51 words
A pressure accumulator as set forth in claim 1 wherein said fluid inlet conducts fluid into said cylinder on the opposite side of said piston from said piston rod, and a second fluid inlet on the opposite side of said piston from said fluid inlet for conducting fluid into said cylinder.
Claim 29
Dependent Claim
22 words
A pressure accumulator as set forth in claim 26 wherein said second fluid inlet comprises a second bore in said piston rod.
References Cited (Backward Citations)
US710889A
Cited
US4174656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |