Patent US3885115A successfully refreshed from Google Patents.
US3885115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch-over contact
Assignee: Bunker Ramo Corp
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Filing: 1973-11-14
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Granted: 1975-05-20
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Expires: 1993-11-14
Abstract
Abstract A switch-over contact for relays or switches in which the contact forces can be easily, yet accurately adjusted without costly adjustment operations. According to the invention, the two contact arms of the switch-over contact have the form of an arc, i.e., they are elastically bent in the undeformed or unstressed state, but assume essentially the form of a straight line segment in the deformed or stressed state. The switch-over assembly comprises a pair of fixed contact members, and a pair of resilient contact arms, the fixed ends of the arms being mounted at substantially a common point in the device, the arms being bent to substantially a straight line positioning the free ends of the arms between the fixed contacts. An armature actuates to move the free ends of the arms into and out of contact with the fixed contact members.
Inventors
- 👤 Wolfgang Adalbert Schrotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:24
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/12; H01H1/14; H01H1/24; H01H1/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
In an electrical switching device, the combination of a first and a second fixed contact member in spaced oppositely facing relation to each other, a movable contact element for making contact alternatively to said first or to said second fixed contact member, said movable contact element comprising two contact arms, each arcuately curved when in free state, each having a contacting surface at one end thereof, the other ends of said contact arms being mounted to a fixed support so that their contacting surfaces are in the space between said first and seCond fixed contact members, and actuating means for moving said movable contact element, including a member engaging both contact arms, the improvement constituted by the sides of said contact arms which are concavely curved in free state facing outwardly from a common line a symmetry between said contact arms as mounted, and the location of said fixed contact members with respect to said contact arms being such that when the contacting surface of one of said contact arms engages one of said fixed contacts, said one of said contact arms has a curvature substantially less than that of its free state conformation.
Claim 2
Dependent Claim
194 words
In an electrical switching device, the combination of a first and a second fixed contact member in spaced oppositely facing relation to each other, a movable contact element for making contact alternatively to said first or to said second fixed contact member, said movable contact element comprising two contact arms, each arcuately curved when in free state, each having a contacting surface at one end thereof, the other ends of said contact arms being mounted to a fixed support so that their contacting surfaces are in the space between said first and seCond fixed contact members, and actuating means for moving said movable contact element, including a member engaging both contact arms, the improvement constituted by the sides of said contact arms which are concavely curved in free state facing outwardly from a common line a symmetry between said contact arms as mounted, and the location of said fixed contact members with respect to said contact arms being such that when the contacting surface of one of said contact arms engages one of said fixed contacts, said one of said contact arms has a curvature substantially less than that of its free state conformation.
Claim 3
Dependent Claim
41 words
An electrical switching device as claimed in claim 1, wherein when the contacting surface of one of said contact arms engages one of said fixed contacts, said one of said contact arms assumes essentially the form of a straight line segment.
Claim 4
Dependent Claim
32 words
An electrical switching device as claimed in claim 1, wherein said contact arms have the form of elongated flat leaf springs and are mounted with their fixed ends bearing against each other.
Claim 5
Dependent Claim
43 words
The electrical switching device as claimed in claim 1, wherein each contact arm has the form of a flat leaf and is slitted from its free end to a clamping point so that a plurality of individual tongues are formed for each arm.
Claim 6
Dependent Claim
34 words
The electrical switching device as claimed in claim 4, wherein the clamping points for the tongues of one contact arm are off-set with respect to each other in longitudinal direction of such contact arm.
Claim 7
Dependent Claim
46 words
The electrical switching device as claimed in claim 1, wherein each contact arm is formed of an integral piece consisting of a resilient material serving as a contact-tongue portion and of a material which can be relatively easily bent to serve as a soldering terminal portion.
Claim 8
Dependent Claim
56 words
The electrical switching device as claimed in claim 1, wherein said actuating means has a U-shaped member affixed thereto for confining said contact arms between the legs of said U-shaped member, said U-shaped member being affective upon actuation of said armature to move said contact arms into and out of contact with said fixed contact members.
References Cited (Backward Citations)
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |