1. Field of the Invention
The invention relates to an electrical plug the kind used on electrically operated equipment, particularly to improvements into the components and the way all the components within the plug are attached and secured without the function of screws for this purpose.
2. Description of the Related Art
Electrical plugs including on electrically operated equipment are well known in the art. AC power plugs and sockets are devices that allow electrically operated equipment to be connected to the primary alternating current power supply in a building. Plugs and sockets for portable appliances started becoming available in 1880s'.
Generally the plug is the movable contact attached to an electrically operated device's mains cable, and the socket is fixed on equipment or a building structure and connected to an energized electrical circuit. The plug has protruding prongs, blades, or pins (referred to as male) that fit into matching slots or holes (called female) in the sockets.
As electricity became a common method of operating labour-saving appliances, a safe means of connection to the electricity system other than using a light socket was needed. According to British Author John Mellanby the first plug and socket in England was introduced by T. T. Smith in 1883, and there were two-pin designs by 1885, one of which appears in the General Electric Company Ltd. Gustav Binswanger, a German immigrant who founded the (British) General Electric Company Ltd, obtained a patent (GB189516898) in 1895 for a plug and socket using a concentric (co-axial) contact system.
An early electrical plug and socket was invented by Harvey Hubbelll and patented in 1904. Hubbell's first design was a socket which screwed into a lamp holder (like the early lamp holder plugs), but with a separable plug with pins or blades (U.S. Pat. No. 774,250).
The German Schuko-system plug was patented by Albert Büttner in 1926. The current American version of the earthed plug, with two parallel blades and a round earthing pin, was invented by Philip F. Labre, while he was attending the Milwaukee School of Engineering. He was issued an US patent for an earthed socket and plug in 1928.
In the prior art, the most conventional male and female electrical plugs replacements in use require a metal holder with a hole on its center to be attached to the wires with screws. Although these fixes tend to work, attaching the wires into these holders with the screws is difficult and it takes a considerable amount time depending of the model and design. Further, the most common plugs replacements use screws to keep the cord tightened and to keep the cover secured to the holder of the electrical contact.
The object of this invention is to provide within a plug, improved components eliminating the function of conventional screws. According to the characteristics of the invention, a novelty line attacher is provided to attach each wire to each electrical contact within an electrical plug. A novelty locking and unlocking mechanism is provided to secure a cover to the component holding the electrical contacts within the plug and a space adjuster mechanism is provided to keep a cord cable tightened firmly to the plug.
The wire receiver includes a hook hanging into a line holder's cavity, the said hook having an elongated arm and the cavity of the said line holder matching at least part of the curvature of the hook, wherein the elongated arm transmitting a force to the hook, therefore the hook coupling into the line holder pressing the electrical contact and securing the electrical wire between.
The locking and unlocking mechanism includes a holder with a complex of passages and slopes, wherein a tooth coupled to the component to be attached, passing through a main passage and locking behind a locking slope. The tooth can be unlocked by sliding an edge of the tooth up an unlocking slope to an exit passage.
The space adjuster mechanism includes a concentrical flower consisting of several movable petals being concentrically and uniformly arranged, such that said petals are pivotally coupled to a concentrical guide's slots and pivotally coupled to a motion transmitter's slots. The petals are mounted one over another on their interior sides, which face the central axis. The motion transmitter causes the petals to rotate on their interior sides one over the other, thereby adjusting the space among the interior sides, and pressing the cord cable in between the petals.
The drawings constitute a part of this specification and include exemplary embodiments of the present invention illustrating various objects and features thereof.
Referring to the drawings, there are provided components for an improved electrical plug 40 illustrated generally in
An optional unlocking preventer mechanism is shown in
This claims priority in U.S. Provisional Patent Application No. 61/941,163 filed Feb. 18, 2014, which is incorporated herein by reference.
Number | Name | Date | Kind |
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774250 | Hubbell | Nov 1904 | A |
1672067 | Labre | Jun 1928 | A |
6561848 | Khemakhem | May 2003 | B1 |
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7524217 | Copper | Apr 2009 | B2 |
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20070026735 | Pyron | Feb 2007 | A1 |
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20070254525 | Pyron | Nov 2007 | A1 |
20120238126 | Damodharan | Sep 2012 | A1 |
Number | Date | Country |
---|---|---|
370538 | Sep 1921 | DE |
16898 | Jan 1896 | GB |
Number | Date | Country | |
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20150236456 A1 | Aug 2015 | US |
Number | Date | Country | |
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61941163 | Feb 2014 | US |