US3728658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically resetting relay
Assignee: Nakatani KK
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Filing: 1972-01-13
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Granted: 1973-04-17
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Expires: 1992-01-13
Abstract
Abstract A permanent magnet is secured within an insulating casing, and on opposite sides thereof, first and second terminals are mounted in the bottom plate of the casing. An L-shaped body of magnetic and electrically conductive material is pivotally mounted within the casing with its one limb being adapted to be attracted by the magnet and having a contact for circuit-opening and-closing purpose interposed in the path to the second terminal. Bimetal is connected between the other limb of the body and the first terminal. When current flow across the first and second terminals exceeds a given value, a distortion of the bimetal due to Joule heat and a reduction in the magnetic permeability of the body due to Joule heat effect in combination a movement of the body away from the magnet, whereby the contact is opened. The body is automatically reset, i.e., attracted by the magnet upon recovery of the bimetal from distortion and increase of the permeability of the body.
Inventors
- 👤 Y Kasahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:23
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/14; H01H71/142
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
An automatically resetting relay comprising a casing of insulating material having a bottom plate which is separable from the remainder of the casing, a permanent magnet secured to the casing substantially centrally therein, first and second terminals secured to said bottom plate on opposite sides of said permanent magnet, said terminals extending through the casing from the interior to the exterior thereof, an L-shaped body of magnetic and electrically conductive material, said L-shaped body having one limb positioned for attraction by said permanent magnet and extending toward the top plate of the casing from a position adjacent said second terminal, said L-shaped body having its other limb bent to extend toward said first terminal in a direction substantially parallel to the top plate of the casing, a bimetal having one end mounted on said first terminal and having its other end contacting said other limb of the body, said bimetal being adapted to deform upon heating thereof so as to produce a displacement of the body operative to move said one limb away from said permanent magnet, and an opening and closing contact interposed between said second terminal and said body.
Claim 2
Dependent Claim
191 words
An automatically resetting relay comprising a casing of insulating material having a bottom plate which is separable from the remainder of the casing, a permanent magnet secured to the casing substantially centrally therein, first and second terminals secured to said bottom plate on opposite sides of said permanent magnet, said terminals extending through the casing from the interior to the exterior thereof, an L-shaped body of magnetic and electrically conductive material, said L-shaped body having one limb positioned for attraction by said permanent magnet and extending toward the top plate of the casing from a position adjacent said second terminal, said L-shaped body having its other limb bent to extend toward said first terminal in a direction substantially parallel to the top plate of the casing, a bimetal having one end mounted on said first terminal and having its other end contacting said other limb of the body, said bimetal being adapted to deform upon heating thereof so as to produce a displacement of the body operative to move said one limb away from said permanent magnet, and an opening and closing contact interposed between said second terminal and said body.
Claim 3
Dependent Claim
73 words
An automatically resetting relay according to claim 1, in which said bimetal has its body contacting at one end thereof with the magnetic and conductive body and being held at the other end thereof by the casing, there being provided a heater for the bimetal, the heater having its one end connected with the magnetic and conductive body through a flexible lead wire and its other end connected with the first terminal member.
Claim 4
Dependent Claim
46 words
An automatically resetting relay according to claim 1, further including a second opening and closing contact mounted on the bottom plate at the opposite side of the body from the second terminal member, said second terminal member being controlled by the angular movement of the body.
Claim 5
Dependent Claim
75 words
An automatically resetting relay according to claim 3, in which said second contact comprises a third terminal member mounted on the bottom plate, a spring contact mounted on the bottom plate intermediate the third terminal member and said magnetic and conductive body, an insulative pusher mounted on the spring contact and arranged opposite to the magnetic and conductive body, and a contact mounted on the third terminal member in opposing relationship with the spring contact.
Claim 6
Dependent Claim
25 words
The relay of claim 1 wherein said body is formed of a material which undergoes a relatively large variation in magnetic permeability with temperature change.
References Cited (Backward Citations)
FR69390E
Cited
US2900474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |