US3794949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state motor starting apparatus
Assignee: Texas Instruments Inc
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Filing: 1973-02-01
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Granted: 1974-02-26
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Expires: 1993-02-01
Abstract
Abstract A motor starting switch providing a predetermined time delay before permitting reenergization of a motor upon deenergization thereof comprises a generally cup-shaped casing having an open end adapted to receive a single or dual solid state starting elements. The dual elements are adapted to be coupled in series or parallel electrical circuit relation. An electrically conductive clip is disposed at the open end of the casing and provides electrical contact, serves as a casing half and maintains a mechanical bias on the solid state starting elements. The switch is provided with plug on terminals so that the switch can be directly plugged into a motor for starting thereof.
Inventors
- 👤 O Larsen
- 👤 C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:17
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/022
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
202 words
A solid state switch comprising a generally cup-shaped casing formed of electrically insulative material, the casing having a bottom wall and a side wall depending therefrom forming a switch cavity, the side wall having a distal free end forming an open end of the casing, two notches are formed in the distal free end portion of the side wall, two ears are formed on the outer peripheral surface of the side wall, one in alignment with each notch, an aperture is defined in a casing wall; electrically conductive means is disposed on the bottom wall in the switch cavity and extends from within the cavity through the aperture to a point outside the casing; electrical resistor means is disposed in the switch cavity in electrical connection with the electrically conductive means disposed on the bottom wall; an electrically conductive, generally U-shaped clip having first and second legs depending from a bight portion, the legs each provided with a slot, the clip is disposed over the open end of the casing with the casing ears projecting through respective leg slots, the bight extending through the notches and having a smooth surface biased against the electrical resistor means spaced from the electrically conductive means.
Claim 2
Dependent Claim
202 words
A solid state switch comprising a generally cup-shaped casing formed of electrically insulative material, the casing having a bottom wall and a side wall depending therefrom forming a switch cavity, the side wall having a distal free end forming an open end of the casing, two notches are formed in the distal free end portion of the side wall, two ears are formed on the outer peripheral surface of the side wall, one in alignment with each notch, an aperture is defined in a casing wall; electrically conductive means is disposed on the bottom wall in the switch cavity and extends from within the cavity through the aperture to a point outside the casing; electrical resistor means is disposed in the switch cavity in electrical connection with the electrically conductive means disposed on the bottom wall; an electrically conductive, generally U-shaped clip having first and second legs depending from a bight portion, the legs each provided with a slot, the clip is disposed over the open end of the casing with the casing ears projecting through respective leg slots, the bight extending through the notches and having a smooth surface biased against the electrical resistor means spaced from the electrically conductive means.
Claim 3
Dependent Claim
49 words
A solid state switch according to claim 1 in which the bight of the electrically conductive U-shaped clip is formed with a plurality of laterally extending smooth wave like depressions to increase the surface of contact engagement and enhance the bias of the clip against the electrical resistor means.
Claim 4
Dependent Claim
99 words
A solid state switch according to claim 1 in which the aperture in the casing wall is located in the bottom wall, the means disposed on the bottom wall comprises an electrically conductive plate formed of material having good spring characteristics, the plate is formed with a plurality of laterally extending smooth wave like depressions to increase the surface of contact engagement and enhance the bias of the plate against the electrical resistor means, and an arm depends from the plate and extends through the aperture in the casing bottom wall and is electrically connected to electrical terminal means.
Claim 5
Dependent Claim
86 words
A solid state switch according to claim 3 in which a second aperture is formed in a casing wall, the electrical resistor means comprises two disk-shaped elements each having two spaced faces, a face of one element in engagement with the electrically conductive plate, an electrically conductive contact plate is interposed between the two elements, the contact plate extends out of the casing through the second aperture and is connectable to an electrical source, and the electrically conductive clip is in engagement with the other element.
Claim 6
Dependent Claim
31 words
A solid state switch according to claim 1 in which the electrical resistor means comprises at least one generally disk-shaped element composed of material having a positive temperature coefficient of resistivity.
Claim 7
Dependent Claim
17 words
A solid state switch according to claim 5 in which the material is a doped barium titanate.
Claim 8
Dependent Claim
20 words
A solid state switch according to claim 5 in which the electrical resistor means comprises two such generally disk-shaped elements.
Claim 9
Dependent Claim
28 words
A solid state switch according to claim 1 in which the means disposed on the bottom wall comprises a flat plate which extends substantially across the switch cavity.
Claim 10
Dependent Claim
74 words
A solid state switch according to claim 1 in which the second aperture is formed in a casing wall and an electrically conductive plate extends substantially across the switch cavity spaced from the bottom wall, the conductive plate also extending through the second aperture and electrically connected to electrical terminal means, the electrical resistor means comprising two electrical resistors, the conductive plate being interposed between and in electrical connection with the two electrical resistors.
Claim 11
Dependent Claim
56 words
A solid state switch according to claim 1 in which the casing is formed with a portion mounting female connectors for terminal pins, one female connector electrically connected to the electrically conductive clip, another female connector electrically connected to a portion of the means disposed on the bottom wall which is disposed outside the switch cavity.
Claim 12
Dependent Claim
50 words
A solid state switch according to claim 10 in which bayonet terminals project from the female connectors below the bottom wall of the casing, the casing is provided with a leg depending from the bottom wall extending beyond the bayonet terminals to facilitate pushing of the switch onto terminal pins.
Claim 13
Dependent Claim
31 words
A solid state switch according to claim 11 including a plurality of stop surfaces projecting from the casing adjacent the female connectors to limit motion of the switch onto terminal pins.
Claim 14
Dependent Claim
44 words
A solid state switch according to claim 10 in which the legs of the U-shaped clip have laterally extending tabs at their face distal ends, the said one female connector having a portion extending therefrom welded to one of the tabs of the clip.
Claim 15
Dependent Claim
103 words
A solid state switch according to claim 1 in which the casing is formed with a portion mounting female connectors for terminal pins, the legs of the U-shaped clip having laterally extending taBs at their free distal ends, one female connector having a portion extending therefrom welded to one of the tabs of the clip, the other clip tab welded to a portion of the means disposed on the bottom wall which is disposed outside the switch cavity, the electrical resistor means comprising two stacked resistor elements, electrical contact means interposed between the two resistor elements and electrically connected to another female connector.
Claim 16
Dependent Claim
94 words
A solid state switch comprising a casing having first and second portions, a plurality of apertures in the first portion, female pin connectors received in the respective apertures, a second portion defining a switch cavity and having an open end, disk-like means having a positive temperature coefficient of resistivity received in the cavity, an electrically conductive clip received over the open end of the second portion and biased against the disc-like means, and means electrically connecting the clip and a portion of the disc-like means spaced from the clip to respective female pin connectors.
Claim 17
Dependent Claim
94 words
A solid state switch comprising a casing having first and second portions, a plurality of apertures in the first portion, female pin connectors received in the respective apertures, a second portion defining a switch cavity and having an open end, disk-like means having a positive temperature coefficient of resistivity received in the cavity, an electrically conductive clip received over the open end of the second portion and biased against the disc-like means, and means electrically connecting the clip and a portion of the disc-like means spaced from the clip to respective female pin connectors.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |