Patent US822804A successfully refreshed from Google Patents.
Patent US3753103A successfully refreshed from Google Patents.
US3753103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical circuit test probe having spring biased probe assembly
Assignee: CRYSTAL PROTRONICS ASS
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Filing: 1971-11-17
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Granted: 1973-08-14
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Expires: 1991-11-17
Abstract
Abstract A device for testing electrical circuits including an elongated hollow barrel having a probe assembly mounted for axial movement in an end thereof, the probe assembly being urged outwardly of the barrel by a compression spring located therein, and further including inner and outer plungers that are interconnected by a leaf spring that provides for firm engagement of the inner plunger with the wall of the barrel, wherein a proper electrical circuit is established from the probe assembly through the barrel.
Inventors
- 👤 P Tetreault
- 👤 D Gobin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:39
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06711; G01R1/06716; G01R1/06722
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
226 words
A device for testing electrical circuits, comprising an elongated hollow barrel, in one end of which a fixed terminal is secured, a probe assembly mounted for axial movement in the other end of said barrel, and a spring interposed between said fixed terminal and probe assembly and normally urging said probe assembly outwardly of the barrel, said probe assembly including a first plunger located interiorly of said barrel, a second plunger located interiorly of said barrel and spaced from said first plunger and resilient means interconnecting said plungers for urging said first plunger into positive electrical communication with the inner wall of said barrel, said resilieNt means including a leaf spring, the ends of which are fixed to said plungers and movable therewith against the action of the first named spring, said leaf spring having a central portion joined by end portions, said end portions being fixed to said plungers on opposite sides of the axis of said barrel and said central portion being inclined with respect to the axis of the barrel and intersecting said axis for locating said end portions in spaced, parallel planes, wherein any inner directed force on said second plunger is translated into a lateral component of force on said first plunger by said leaf spring, thereby forcing said first plunger into positive contact with the inner wall of said barrel.
Claim 2
Independent Claim
226 words
A device for testing electrical circuits, comprising an elongated hollow barrel, in one end of which a fixed terminal is secured, a probe assembly mounted for axial movement in the other end of said barrel, and a spring interposed between said fixed terminal and probe assembly and normally urging said probe assembly outwardly of the barrel, said probe assembly including a first plunger located interiorly of said barrel, a second plunger located interiorly of said barrel and spaced from said first plunger and resilient means interconnecting said plungers for urging said first plunger into positive electrical communication with the inner wall of said barrel, said resilieNt means including a leaf spring, the ends of which are fixed to said plungers and movable therewith against the action of the first named spring, said leaf spring having a central portion joined by end portions, said end portions being fixed to said plungers on opposite sides of the axis of said barrel and said central portion being inclined with respect to the axis of the barrel and intersecting said axis for locating said end portions in spaced, parallel planes, wherein any inner directed force on said second plunger is translated into a lateral component of force on said first plunger by said leaf spring, thereby forcing said first plunger into positive contact with the inner wall of said barrel.
Claim 3
Dependent Claim
46 words
A device as set forth in claim 1, the oppositely facing ends of said first and second plungers having slits formed therein for receiving the end portions of said leaf spring therein, whereby said leaf spring is firmly anchored to said plungers and is movable therewith.
Claim 4
Independent Claim
208 words
A device for testing electrical circuits, comprising an elongated hollow barrel, in one end of which a fixed terminal is secured, a probe assembly mounted for axial movement in the other end of said barrel, and a spring interposed between said fixed terminal and probe assembly and normally urging said probe assembly outwardly, longitudinally of the barrel, said probe assembly including a first plunger located interiorly of said barrel intermediate the ends thereof, a second plunger located interiorly of said barrel adjacent to the other end thereof and longitudinally spaced from said first plunger, said second plunger including a probe contact that extends outwardly of the other end of said barrel and that defines a probe terminal for engaging a contact in the electrical circuit to be tested, and resilient means located within said barrel between said plungers and having opposed end portions interconnected thereto at least one end portion being displaced from the axis of said barrel, said resilient means being generally inclined to the axis of said barrel and urging said first plunger into positive electrical communication with the inner wall of said barrel upon engagement of said probe terminal with a contact, said barrel defining a guide for the longitudinal movement of said probe assembly.
Claim 5
Independent Claim
208 words
A device for testing electrical circuits, comprising an elongated hollow barrel, in one end of which a fixed terminal is secured, a probe assembly mounted for axial movement in the other end of said barrel, and a spring interposed between said fixed terminal and probe assembly and normally urging said probe assembly outwardly, longitudinally of the barrel, said probe assembly including a first plunger located interiorly of said barrel intermediate the ends thereof, a second plunger located interiorly of said barrel adjacent to the other end thereof and longitudinally spaced from said first plunger, said second plunger including a probe contact that extends outwardly of the other end of said barrel and that defines a probe terminal for engaging a contact in the electrical circuit to be tested, and resilient means located within said barrel between said plungers and having opposed end portions interconnected thereto at least one end portion being displaced from the axis of said barrel, said resilient means being generally inclined to the axis of said barrel and urging said first plunger into positive electrical communication with the inner wall of said barrel upon engagement of said probe terminal with a contact, said barrel defining a guide for the longitudinal movement of said probe assembly.
Claim 6
Dependent Claim
35 words
A device as set forth in claim 3, said resilient means including a leaf spring, the ends of which are fixed to said plungers and movable therewith against the action of said first named spring.
Claim 7
Dependent Claim
26 words
A device as set forth in claim 4, the lateral dimension of said leaf spring being relatively reduced with respect to the diameter of said barrel.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |