US3704904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston rod joint
Assignee: OILWELL Inc A CORP OF
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Filing: 1972-01-24
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Granted: 1972-12-05
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Expires: 1992-01-24
Abstract
Abstract A joint for connecting a crosshead extension rod to a piston rod end-to-end. The piston rod has an integral tapered threaded pin at its end, a straight threaded portion inwardly of the pin, and an undercut section between the pin and the straight threads. The extension rod has a tapered threaded bore receiving the pin. A lock nut is engaged with the straight threads and tightened against the end face of the extension rod to maintain the undercut section under tension throughout the working cycle.
Inventors
- 👤 Michael L Rizzone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:35
CPC Classifications
F; F16; F16J; F16J7/00; F16B; F16B2200/00; F16B2200/69; F16B2200/73
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
The combination, with a piston rod and an extension rod connected to said piston rod end-to-end, of an improved joint comprising an integral tapered threaded pin at the end of said piston rod, a straight threaded portion on said piston rod inwardly of said pin, an undercut groove portion on said piston rod extending between the pin and the straight threads, said extension rod having a tapered threaded bore in its end face receiving said pin, and a lock nut threadedly engaging said straight threaded portion and abutting the end face of said extension rod, the end face of said extension rod being opposite said groove portion, said lock nut clearing said groove portion and being tightened sufficiently to maintain said groove portion under tension within the working load on the joint.
Claim 2
Dependent Claim
132 words
The combination, with a piston rod and an extension rod connected to said piston rod end-to-end, of an improved joint comprising an integral tapered threaded pin at the end of said piston rod, a straight threaded portion on said piston rod inwardly of said pin, an undercut groove portion on said piston rod extending between the pin and the straight threads, said extension rod having a tapered threaded bore in its end face receiving said pin, and a lock nut threadedly engaging said straight threaded portion and abutting the end face of said extension rod, the end face of said extension rod being opposite said groove portion, said lock nut clearing said groove portion and being tightened sufficiently to maintain said groove portion under tension within the working load on the joint.
Claim 3
Dependent Claim
18 words
A combination as defined in claim 1 in which said pin has a socket in its end face.
Claim 4
Dependent Claim
18 words
A combination as defined in claim 1 in which said piston rod is embodied in a reciprocating pump.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |