US4334257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overvoltage protection device
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1980-02-14
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Granted: 1982-06-08
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Expires: 2000-02-14
Abstract
Abstract An overvoltage protection device for wires, preferably telephone cables, comprises overvoltage arresters (11) of the discharge tube type and connection clamps (7, 8) for the wires, which connection clamps are placed in a terminal block (2). The device is manufactured in such a manner that the overvoltage arresters (11) are enclosed in a detachable cassette (16) and so that the terminal box (2) is pivotal to allow for insertion and removal of the cassette (16). The cassette comprises a number of spaces for the overvoltage arresters (11) and a movable lock (19) to retain and to release the overvoltage arresters (11) respectively.
Inventors
- 👤 Per A. A. Ekdahl
- 👤 Fred L. Moller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:10
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
An overvoltage protection device for wires, preferably telephone wires, comprising overvoltage arresters (11) of the discharge tube type and connection clamps (7, 8) for the wires, said connection clamps being mounted in a terminal block (2) and pressed against one of the poles of the overvoltage arresters (11), the opposite pole of the overvoltage arresters being supported against a holder (1) formed of sheet metal and providing a ground connection, characterized in that the overvoltage arresters (11) are enclosed in a detachable cassette (16) of insulating material placed in a space between the terminal block (2) and the holder (1), and in that terminal block (2) is pivotal about pins (4) at one of its ends, thereby allowing access to the space between the terminal block (2) and the holder (1) for insertion and removal of the cassette (16).
Claim 2
Dependent Claim
139 words
An overvoltage protection device for wires, preferably telephone wires, comprising overvoltage arresters (11) of the discharge tube type and connection clamps (7, 8) for the wires, said connection clamps being mounted in a terminal block (2) and pressed against one of the poles of the overvoltage arresters (11), the opposite pole of the overvoltage arresters being supported against a holder (1) formed of sheet metal and providing a ground connection, characterized in that the overvoltage arresters (11) are enclosed in a detachable cassette (16) of insulating material placed in a space between the terminal block (2) and the holder (1), and in that terminal block (2) is pivotal about pins (4) at one of its ends, thereby allowing access to the space between the terminal block (2) and the holder (1) for insertion and removal of the cassette (16).
Claim 3
Dependent Claim
53 words
An overvoltage protection device according to claim 1, characterized in that said cassette (16) is provided with a number of spaces for receiving the overvoltage arresters (11) and with a movable lock (19) arranged to hold the mounted overvoltage arresters in one end position and to release them in the opposite end position.
Claim 4
Dependent Claim
79 words
An overvoltage protection device according to claim 1, characterized in that, in order to determine its position in the holder (1), said cassette (16) is provided at one of its end with hooks (21) and at its other end with pegs (22), said hooks and pegs corresponding to holes (14, 15) in the holder (1), and a number of supports (23) protrude from the sides of the cassette so as to bear against the inner sides of the holder.
Claim 5
Dependent Claim
54 words
An overvoltage protection device according to claim 1, characterized in that the connection clamps (7, 8) of the terminal block (2) for the wires are adapted to be disconnected from all the poles of the overvoltage arresters (11) approximately simultaneously as the terminal block (2) is pivoted away form the sheet metal holder (1).
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |