US3729219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint for connecting sections of a member subject to cyclic compressive loading
Assignee: OILWELL Inc A CORP OF
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Filing: 1970-12-24
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Granted: 1973-04-24
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Expires: 1990-12-24
Abstract
Abstract A joint for connecting sections of a member which is subject to cyclic compressive loading. Such joints are used, for example, in the piston rods of single-acting reciprocating pumps, and may fail through fatigue. The joint comprises a stud threadedly engaged with the end of at least one of the sections, and means surrounding the stud and transmitting loads independently of the stud. The stud has a substantially lower modulus of elasticity than the load-transmitting means.
Inventors
- 👤 R Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:01
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/18; F16B7/182; Y; Y10; Y10T; Y10T403/00; Y10T403/51; Y10T403/55; Y10T403/556; Y10T403/60; Y10T403/602
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
In a member which is subject to cyclic compressive loading and is formed of first and second sections connected end-to-end, the confronting ends of said sections having bores and counterbores, said bores being tapped, an improved joint comprising a stud having threaded portions adjacent each end engaged in said tapped bores and having a portion of larger diameter than its threaded portions closely engaging said counterbores, said stud being prestressed with a relatively small tensile load, and means integral with said sections and surrounding said stud for transmitting compressive loads from one section to the other independently of said stud, said loadtransmitting means being prestressed with a relatively small compressive load, said stud having a substantially lower modulus of elasticity than said load-transmitting means.
Claim 2
Dependent Claim
124 words
In a member which is subject to cyclic compressive loading and is formed of first and second sections connected end-to-end, the confronting ends of said sections having bores and counterbores, said bores being tapped, an improved joint comprising a stud having threaded portions adjacent each end engaged in said tapped bores and having a portion of larger diameter than its threaded portions closely engaging said counterbores, said stud being prestressed with a relatively small tensile load, and means integral with said sections and surrounding said stud for transmitting compressive loads from one section to the other independently of said stud, said loadtransmitting means being prestressed with a relatively small compressive load, said stud having a substantially lower modulus of elasticity than said load-transmitting means.
Claim 3
Dependent Claim
42 words
A joint as defined in claim 1 in which said sections are of steel and have a modulus of elasticity around 29,000,000 to 30, 000,000 psi, and said stud is of a metal selected from the group consisting of aluminum-bronze and titanium.
Claim 4
Dependent Claim
21 words
A joint as defined in claim 1 in which said member is a piston rod of a high-pressure, single-acting reciprocating pump.
Claim 5
Dependent Claim
118 words
In a member which is subject to cyclic compressive loading and is formed of first and second sections connected end-to-end, the end of said first section having a tapped bore, an improved joint comprising a stud friction-welded to the end of said second section and having a threaded end portion engaged in said bore, said stud being prestressed with a relatively small tensile load, and means integral with said first section and abutting said second section and surrounding said stud for transmitting compressive loads from one section to the other independently of said stud, said load-transmitting means being prestressed with a relatively small compressive load, said stud having a substantially lower modulus of elasticity than said load-transmitting means.
Claim 6
Dependent Claim
118 words
In a member which is subject to cyclic compressive loading and is formed of first and second sections connected end-to-end, the end of said first section having a tapped bore, an improved joint comprising a stud friction-welded to the end of said second section and having a threaded end portion engaged in said bore, said stud being prestressed with a relatively small tensile load, and means integral with said first section and abutting said second section and surrounding said stud for transmitting compressive loads from one section to the other independently of said stud, said load-transmitting means being prestressed with a relatively small compressive load, said stud having a substantially lower modulus of elasticity than said load-transmitting means.
References Cited (Backward Citations)
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Cited
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |