US3611247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety electrical plug
Assignee: Hill Rom Co Inc
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Filing: 1969-08-11
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Granted: 1971-10-05
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Expires: 1989-08-11
Abstract
Abstract A safety plug, for connecting an electrical appliance to a source of power, having a plurality of chambers each individual to one of the three terminals of the plug and having a transparent cover for said chambers to permit visual inspection of the connections therein without disassembling the plug.
Inventors
- 👤 James S Adams
- 👤 John W Heidacher
- 👤 Ralph G Blanken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:33
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/46; H01R13/502; Y; Y10; Y10S; Y10S439/00; Y10S439/91; Y10S439/933; Y10S439/934
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A safety plug for removably connecting an electrical appliance to a source of electrical power, comprising: a. a base member; b. two power contacts and a grounding contact fixed in said base and projecting from one side thereof and having terminals located on the other side of the base; c. a transparent cover fixed upon said base, enclosing said terminals, and extending from one side thereof; d. an electrical cord having a conductor connected to each one of said terminals; e. a bar fixed upon the extending portion of said cover and clamping the cord thereto; f. a Y-shaped wall upstanding from said base, forming chambers in each of which one of said terminals is located, each arm of said wall terminating inwardly from the edge of the base and around the end of said wall the conductor leading to the terminal is positioned, and g. a Y-shaped wall depending from said cover, aligned with the wall on the base, extending to the sidewall of the cover and engaging the conductor to hold it in position.
Claim 2
Dependent Claim
176 words
A safety plug for removably connecting an electrical appliance to a source of electrical power, comprising: a. a base member; b. two power contacts and a grounding contact fixed in said base and projecting from one side thereof and having terminals located on the other side of the base; c. a transparent cover fixed upon said base, enclosing said terminals, and extending from one side thereof; d. an electrical cord having a conductor connected to each one of said terminals; e. a bar fixed upon the extending portion of said cover and clamping the cord thereto; f. a Y-shaped wall upstanding from said base, forming chambers in each of which one of said terminals is located, each arm of said wall terminating inwardly from the edge of the base and around the end of said wall the conductor leading to the terminal is positioned, and g. a Y-shaped wall depending from said cover, aligned with the wall on the base, extending to the sidewall of the cover and engaging the conductor to hold it in position.
Claim 3
Dependent Claim
29 words
A safety plug as specified in claim 1 in which said wall means prevents a conductor that has loosened from its terminal from coming into contact with another terminal.
Claim 4
Dependent Claim
29 words
A safety plug as specified in claim 1 in which the base, the cover and the clamp bar are molded from a rigid plastic material having high dielectric strength.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |