US3660703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal governor speed control for electric motors
Assignee: GLENBURN ENGINEERING Ltd CONVE
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Filing: 1970-06-29
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Granted: 1972-05-02
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Expires: 1990-06-29
Abstract
Abstract The specification discloses a speed control for an electric motor of the type including a centrifugal governor in which the governor comprises a rigid backing plate secured to the armature spindle of the motor and extending radially on opposite sides of the spindle and a flexible strip secured at its ends to the outer end parts of the backing plate and having weighted portions at or close to its extremities and an abutment part at its mid-point which engages means to open and close the contacts to the electric motor. The contacts may comprise a fixed contact and a movable contact, the movable contact being provided on the one arm of a two-armed lever which is pivotally mounted about an axis intermediate the two arms and the fixed contact member being mounted on a further arm pivoted about a further axis and adjustable in position relative to the movable contact by means of a manually operated cam to permit adjustment of the speed of the motor.
Inventors
- 👤 Philip Henry Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:56
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/20; H02K11/21; H02K11/23
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
204 words
A speed control means for an electric motor comprising a centrifugal governor adapted to be rotated by the electric motor and to open and to close electric contacts in the electric circuit to the motor, including the improvement wherein the governor comprises a spindle adapted to be rotated by the motor, a rigid backing plate fixedly secured to an end of the spindle at the mid-point of the plate and extending diametrically of the spindle, a single flexible strip fixedly secured at its outer ends to the outer end parts of the backing plate and having weighted portions at the extremities of the strip and positioned inwardly of the position of securement of the strip to the backing plate and an abutment part at the mid-point of the strip, the main length of the flexible strip intermediate its end being substantially parallel to the plane of the backing plate in the at-rest position of the strip and the abutment part of the flexible strip being adapted to open and close the contacts by flexing of the strip respectively in the direction to move the abutment part away from and towards the backing plate as a result of centrifugal force acting on said weighted portions.
Claim 2
Dependent Claim
204 words
A speed control means for an electric motor comprising a centrifugal governor adapted to be rotated by the electric motor and to open and to close electric contacts in the electric circuit to the motor, including the improvement wherein the governor comprises a spindle adapted to be rotated by the motor, a rigid backing plate fixedly secured to an end of the spindle at the mid-point of the plate and extending diametrically of the spindle, a single flexible strip fixedly secured at its outer ends to the outer end parts of the backing plate and having weighted portions at the extremities of the strip and positioned inwardly of the position of securement of the strip to the backing plate and an abutment part at the mid-point of the strip, the main length of the flexible strip intermediate its end being substantially parallel to the plane of the backing plate in the at-rest position of the strip and the abutment part of the flexible strip being adapted to open and close the contacts by flexing of the strip respectively in the direction to move the abutment part away from and towards the backing plate as a result of centrifugal force acting on said weighted portions.
Claim 3
Dependent Claim
50 words
A speed control means according to Claim 11 wherein the weighted portions are provided by forming the strip, at each of its ends and inwardly of the position of securement of the strip to the backing plate, with a loop which projects in the direction away from the backing plate.
Claim 4
Dependent Claim
39 words
A speed control means according to claim 2, wherein the strip is provided with a projecting nose portion extending in the direction away from the backing plate and having a transversely extending end surface which provides the abutment pArt.
Claim 5
Dependent Claim
100 words
A speed control means according to claim 1, wherein the electric contacts comprise a fixed contact and a movable contact, and the movable contact is provided on one arm of a two-armed member which is pivotally mounted about an axis intermediate the two arms, the other arm being engaged by the abutment portion and the fixed contact member being on a further arm separately pivoted about the axis and the further arm being acted upon by manually operable adjustment means to cause the further arm to move against spring resistance to enable the speed of the motor to be adjusted.
Claim 6
Dependent Claim
100 words
A speed control means according to claim 3, wherein the electric contacts comprise a fixed contact and a movable contact, and the movable contact is provided on one arm of a two-armed member which is pivotally mounted about an axis intermediate the two arms, the other arm being engaged by the abutment portion and the fixed contact member being on a further arm separately pivoted about the axis and the further arm being acted upon by manually operable adjustment means to cause the further arm to move against spring resistance to enable the speed of the motor to be adjusted.
Claim 7
Dependent Claim
25 words
A speed control means according to claim 4, wherein said manually operable adjustment means comprises a manually rotatable cam means acting upon the further arm.
Claim 8
Dependent Claim
25 words
A speed control means according to claim 5, wherein said manually operable adjustment means comprises a manually rotatable cam means acting upon the further arm.
Claim 9
Dependent Claim
16 words
An electric motor including the improvement comprising a speed control means as claimed in claim 1.
Claim 10
Dependent Claim
23 words
An electric motor according to claim 8, wherein the rigid backing plate is mounted on an extension of the armature of the motor.
Claim 11
Dependent Claim
16 words
An electric motor including the improvement comprising a speed control means as claimed in claim 5.
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |