US3703342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel pump bellows construction
Assignee: Walbro Corp
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Filing: 1971-07-30
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Granted: 1972-11-21
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Expires: 1991-07-30
Abstract
Abstract A one-piece pump bellows of a flexible, resilient material with a corrugated generally cylindrical sidewall having a plurality of interleaved outer and inner bends with interconnecting wall portions. The corrugated wall is not of uniform thickness and the thickness at the bends of the wall is greater than the maximum thickness of the interconnecting wall portions. The thickness of the interconnecting wall portions immediately adjacent the bends is less than the maximum thickness of the interconnecting wall portions. The outer bends have associated pairs of opposed circumferential ribs on the inside surface of the interconnecting walls and the inner bends have associated pairs of opposed circumferential ribs on the outside surface of the interconnecting walls. The pairs of opposed ribs are adapted to abut when the bellows is foreshortened by overstroking which decreases the maximum stress to which the bends are subjected and substantially increases the service life of the bellows.
Inventors
- 👤 Alton J O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:53
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F16; F16J; F16J3/00; F16J3/04; F16J3/041
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A one-piece homogeneously integral bellows of a resilient nonmetallic rubber-like synthetic material for use in a pump having a flexible corrugated generally circular wall with a plurality of interleaved radially and axially spaced outer and inner circumferential bends with interconnecting wall portions, said bends having a greater thickness in cross section than the maximum thickness in cross section of said interconnecting wall portions with said interconnecting wall portions having a lesser thickness in cross section immediately adjacent said bends than said maximum thickness in cross section of said interconnecting wall portions.
Claim 2
Dependent Claim
91 words
A one-piece homogeneously integral bellows of a resilient nonmetallic rubber-like synthetic material for use in a pump having a flexible corrugated generally circular wall with a plurality of interleaved radially and axially spaced outer and inner circumferential bends with interconnecting wall portions, said bends having a greater thickness in cross section than the maximum thickness in cross section of said interconnecting wall portions with said interconnecting wall portions having a lesser thickness in cross section immediately adjacent said bends than said maximum thickness in cross section of said interconnecting wall portions.
Claim 3
Dependent Claim
91 words
A one-piece homogeneously integral bellows of a resilient nonmetallic rubber-like synthetic material for use in a pump having a flexible corrugated generally circular wall with a plurality of interleaved radially and axially spaced outer and inner circumferential bends with interconnecting wall portions, said bends having a greater thickness in cross section than the maximum thickness in cross section of said interconnecting wall portions with said interconnecting wall portions having a lesser thickness in cross section immediately adjacent said bends than said maximum thickness in cross section of said interconnecting wall portions.
Claim 4
Dependent Claim
91 words
A one-piece homogeneously integral bellows of a resilient nonmetallic rubber-like synthetic material for use in a pump having a flexible corrugated generally circular wall with a plurality of interleaved radially and axially spaced outer and inner circumferential bends with interconnecting wall portions, said bends having a greater thickness in cross section than the maximum thickness in cross section of said interconnecting wall portions with said interconnecting wall portions having a lesser thickness in cross section immediately adjacent said bends than said maximum thickness in cross section of said interconnecting wall portions.
Claim 5
Dependent Claim
30 words
The one-piece bellows of claim 1 in which said inner bends have an associated pair of circumferential ribs in opposed relation on the outer surface of the interconnecting wall portions.
Claim 6
Dependent Claim
30 words
The one-piece bellows of claim 1 in which said outer bends have an associated pair of circumferential ribs in opposed relation on the inner surface of the interconnecting wall portions.
Claim 7
Dependent Claim
30 words
The one-piece bellows of claim 3 in which said inner bends have an associated pair of circumferential ribs in opposed relation on the outer surface of the interconnecting wall portions.
Claim 8
Dependent Claim
30 words
The one-piece belLows of claim 4 in which said pairs of ribs are adapted to abut when said bellows is foreshortened by overstroking of said bellows by the fuel pump.
Claim 9
Dependent Claim
157 words
In a fuel pump of the type having a pumping chamber with an inlet and an outlet, a solenoid actuator with a stroke of variable length for reciprocating one end of a bellows, and a switch means for effecting reciprocation of one end of the bellows by the solenoid actuator, a one-piece bellows fixed at one end, coupled to said pumping chamber, and operably connected at the other end to said solenoid actuator for reciprocation comprising a one-piece homogeneously integral corrugated wall of a flexible resilient nonmetallic rubber-like synthetic material with a plurality of interleaved radially and axially spaced outer and inner circumferential bends with interconnecting wall portions, said bends having a greater thickness in cross section than the maximum thickness in cross section of said interconnecting wall portions with said interconnecting wall portions having a lesser thickness in cross section immediately adjacent said bends than said maximum thickness in cross section of said interconnecting wall portions.
Claim 10
Dependent Claim
157 words
In a fuel pump of the type having a pumping chamber with an inlet and an outlet, a solenoid actuator with a stroke of variable length for reciprocating one end of a bellows, and a switch means for effecting reciprocation of one end of the bellows by the solenoid actuator, a one-piece bellows fixed at one end, coupled to said pumping chamber, and operably connected at the other end to said solenoid actuator for reciprocation comprising a one-piece homogeneously integral corrugated wall of a flexible resilient nonmetallic rubber-like synthetic material with a plurality of interleaved radially and axially spaced outer and inner circumferential bends with interconnecting wall portions, said bends having a greater thickness in cross section than the maximum thickness in cross section of said interconnecting wall portions with said interconnecting wall portions having a lesser thickness in cross section immediately adjacent said bends than said maximum thickness in cross section of said interconnecting wall portions.
Claim 11
Dependent Claim
30 words
The one-piece bellows of claim 6 in which said outer bends have an associated pair of circumferential ribs in opposed relation on the inner surface of the interconnecting wall portions.
Claim 12
Dependent Claim
30 words
The one-piece bellows of claim 7 in which said inner bends have an associated pair of circumferential ribs in opposed relation on the outer surface of the interconnecting wall portions.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |