Patent US3955809A successfully refreshed from Google Patents.
US3955809A
Expired / Lapsed
US
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Spiral spring for instruments
Assignee: Mitsubishi Electric Corp
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Filing: 1974-05-23
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Granted: 1976-05-11
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Expires: 1994-05-23
Abstract
Abstract A spiral spring arrangement consists essentially of two spiral springs. The spring arrangement comprises an immovable member, a rotatable shaft, and a rotatively movable member. One of the spiral springs has one end connected to the immovable member and the other end to the rotatable shaft. The other spiral spring has one end connected to the rotatable shaft and the other end to the rotatively movable member. The rotatably movable member serves as the point acting on the spiral springs. The two spiral springs are in a serial relationship, thus reducing the spring constant against rotation.
Inventors
- 👤 Kuniyoshi Hara
- 👤 Junichi Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:49
CPC Classifications
F; F16; F16F; F16F3/00; F16F3/02; F16F3/04; G; G12; G12B; G12B3/00; G12B3/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
65 words
In an instrument having a movable part, a spiral spring arrangement comprising: a rotatably supported rotatable body; a first spiral spring having one end fastened to the rotatable body and the other end fastened to the movable part of the instrument; and a second spiral spring having one end fastened to the rotatable body and the other end to a fixed point of the instrument.
Claim 2
Dependent Claim
65 words
In an instrument having a movable part, a spiral spring arrangement comprising: a rotatably supported rotatable body; a first spiral spring having one end fastened to the rotatable body and the other end fastened to the movable part of the instrument; and a second spiral spring having one end fastened to the rotatable body and the other end to a fixed point of the instrument.
Claim 3
Dependent Claim
14 words
The combination recited in claim 1 wherein the rotatable body is a rotatable shaft.
Claim 4
Dependent Claim
28 words
The combination recited in claim 1 wherein means is provided for independently changing the positions where the first and second spiral springs are fastened to the rotatable body.
Claim 5
Dependent Claim
66 words
The combination recited in claim 2 wherein one end of the first spiral spring is fastened to the rotatable shaft by a first annular fastener which is semi-rotatably fitted on the rotatable shaft and one end of the second spiral spring is fastened to the rotatable shaft by a second annular fastener which is semi-rotatably fitted on the rotatable shaft independent of the first annular fastener.
Claim 6
Dependent Claim
58 words
The combination recited in claim 1 wherein the first spiral spring has its inner end fastened to the rotatable body and its outer end fastened to the movable part of the instrument and the second spiral spring having its inner end fastened to the rotatable body and its outer end fastened to a fixed point of the instrument.
Claim 7
Dependent Claim
19 words
The combination recited in claim 1 wherein the first and second spiral springs are coiled in the same direction.
Claim 8
Dependent Claim
21 words
The combination recited in claim 1 wherein the first and second spiral springs are coiled in directions opposite to each other.
Claim 9
Dependent Claim
55 words
The combination recited in claim 1 wherein the first spiral spring has its inner end fastened to the movable part of the instrument and its outer end fastened to the rotatable body and the second spiral spring has its inner end fastened to a fixed point and its outer end fastened to the rotatable body.
Claim 10
Dependent Claim
28 words
The combination recited in claim 8 wherein means is provided for independently changing the positions where the first and second spiral springs are fastened to the rotatable body.
Claim 11
Dependent Claim
80 words
In an instrument having a movable part, a spiral spring arrangement comprising: a rotatably supported cylindrical body; a first spiral spring housed in the cylindrical body and having its outer end fastened to the cylindrical body and its inner end fastened to the movable part of the instrument; and a second spiral spring housed in the cylindrical body and having its outer end fastened to the cylindrical body and its inner end fastened to a fixed point of the instrument.
Claim 12
Dependent Claim
80 words
In an instrument having a movable part, a spiral spring arrangement comprising: a rotatably supported cylindrical body; a first spiral spring housed in the cylindrical body and having its outer end fastened to the cylindrical body and its inner end fastened to the movable part of the instrument; and a second spiral spring housed in the cylindrical body and having its outer end fastened to the cylindrical body and its inner end fastened to a fixed point of the instrument.
Claim 13
Dependent Claim
24 words
The combination recited in claim 10 wherein means is provided for independently changing the positions where the first and second spiral springs are fastened.
Claim 14
Dependent Claim
77 words
In an instrument having a movable part, a spiral spring arrangement comprising: a rotatably supported shaft having a cylindrical part; a first spiral spring having its inner end fastened to the rotatable shaft and its outer end fastened to the movable part of the instrument; and a second spiral spring housed in the cylindrical part and having its outer end fastened to the cylindrical part and its inner end fastened to a fixed point of the instrument.
Claim 15
Dependent Claim
77 words
In an instrument having a movable part, a spiral spring arrangement comprising: a rotatably supported shaft having a cylindrical part; a first spiral spring having its inner end fastened to the rotatable shaft and its outer end fastened to the movable part of the instrument; and a second spiral spring housed in the cylindrical part and having its outer end fastened to the cylindrical part and its inner end fastened to a fixed point of the instrument.
Claim 16
Dependent Claim
24 words
The combination recited in claim 12 wherein means is provided for independently changing the positions where the first and second spiral springs are fastened.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |