This invention relates to electrical connectors and has particular relevance to connectors used with vehicle trailers. However the invention is not limited to use with vehicle trailers.
Trailers for road vehicles have various electrical lights, such as brake, tail lights and indicator lights. These are powered and controlled from the tow vehicle.
The electrical connection from the trailer to the tow vehicle is usually via a detachable multi strand cable. Typically the tow vehicle has a socket mounted at its rear into which a plug on the cable of the trailer is inserted. To allow for movement of the trailer relative to the tow vehicle the cable cannot be taut and there must be extra cable, i.e. some slack, to accommodate this relative movement.
When the trailer is detached from the tow vehicle the plug is removed from the socket and then hangs from the loose cable. The plug and cable can present a safety hazard when manoeuvring a trailer. For example a person manoeuvring the trailer may trip on the cable. In addition, the plug and cable may be damaged or contaminated with debris, such as dirt. Most single axle trailers are balanced so the trailer hitch rests on the ground when unloaded. The cable and plug are at the hitch end and commonly either rest on the ground, where they can be contaminated or can be crushed by the trailer hitch.
Electrical connectors are typically provided in one or two forms. In one form the connector is in a fully assembled form, with the cable permanently attached to the electrical pins or sockets and, usually encased in a moulded shell. The other form is for attachment to a cable at a later date. Permanently attached cables typically are connected to rolled terminals that are crimped to the electrical wire. Connectors for which the cable is attached later are typically provided with terminals formed of solid metal that has been machined to have a bore for the wire and a threaded side aperture for a screw. Whilst these allow a cable to be attached and detached they are more expensive than rolled terminals.
In one broad form the invention provides an electrical connector for a towed vehicle, the connector including securing means for temporarily securing the electrical connector to the towed vehicle.
In one form the securing means includes at least one first magnet, whereby the electrical connector may be secured by the magnet to a magnetic part of the towed vehicle.
At least one second magnet may be provided for permanent mounting on the towed vehicle for magnetic connection with the at least one first magnet.
The securing means may comprise at least one mechanical securing means to secure the connector to the towed vehicle. The at least one mechanical securing means may comprise a clip, plug or socket that interacts with a corresponding complementary structure on the towed vehicle. There may be a clip or other structure on the towed vehicle that engages the connector.
Where the electrical connector has a plug portion the complementary structure may be a secondary socket mounted on the towed vehicle into which the plug portion is inserted and secured. Where the electrical connector has a socket portion the complementary structure may be a secondary plug mounted on the towed vehicle over which the socket portion is engaged with and secured.
The invention, in another form, provides a rolled terminal for an electrical connector. The rolled terminal has a first portion formed of a rolled sheet defining a bore for receiving an electrical wire and a first aperture in the wall of the first portion for receiving a screw for clamping the wire between the screw and the wall of the first portion.
The first aperture may be sized so the screw is a clearance fit in the aperture. Alternatively, the first aperture may be an interference fit. The material of the wall and the size of the first aperture may be chosen so that the thread of the screw engages the first aperture in a threaded manner. The first aperture may be deformed by the thread of the screw to present a complementary thread or the first aperture may be provided with a complementary thread.
In another form the rolled terminal of the invention is located in a plastics carrier that has a second aperture that aligns with the first aperture. The second aperture may be a clearance fit with the screw or may engage the thread of the screw.
The second aperture may be provided with a thread with which the screw engages. This may be by way of a separately threaded component, such as a nut, embedded in the plastics material. Alternatively the second aperture may be sized so the screw forms a thread on first use. Alternatively the aperture may be formed with a thread for the screw.
Accordingly, the invention also provides an electrical connector including at least one rolled terminal located in a carrier, the at least one a rolled terminal having a first portion formed of a rolled sheet defining a bore for receiving an electrical wire and a first aperture in the wall of the first portion for receiving a screw; a second aperture in the carrier aligned with the first aperture and a screw located in the second aperture for clamping the wire between the screw and the wall of the first portion.
The connector may be a plug or a socket. The at least one rolled terminal may include at least one plug type rolled terminal, at least one socket type rolled terminal or both at least one plug type rolled terminal and at least one socket type rolled terminal.
The screw may engage one or both of the first and second apertures. Preferably the screw only engages either the first or the second aperture.
Preferably the rolled terminal includes means to prevent or limit rotation about a longitudinal axis when mounted in the carrier. The means to prevent or limit rotation is preferably a part of the first portion that has a non circular cross section. In one form a part of the wall of the first portion is pressed outwards. Preferably the carrier has a complementary recess into which the part of the wall extends. This enables the terminal to be correctly aligned in the carrier recess so that the first and second apertures align.
When the screw is holding the wire in the terminal the screw also prevents the terminal being pulled or pushed out of the carrier.
Referring to
The connector 10 has a magnet 18 secured in the shell 16. The magnet 18 may be secured by moulding the shell around the magnet during manufacture or, less preferred, by providing the shell with a recess and gluing or otherwise securing the magnet to the shell post manufacture.
As seen in
In use the plug portion 22 of the connector 10 may be inserted as normal into a corresponding socket mounted on a tow vehicle. When the trailer is not connected to the tow vehicle the connector may be temporarily connected to part of the structure of the trailer, as shown in
As seen in
When the trailer is next used the user merely pulls the connector 10 away from the draw bar 26.
The connector 10 need not be a moulded connector and may be formed with a multipart shell that is assembled around the cable 12 and electrical connectors after electrical connection of the cable to the pins.
Paint on the trailer may result in the magnetic attractive force being marginal or insufficient to secure the connector to the trailer. Accordingly, a second magnet may be provided, preferably in a suitable mounting, for permanent attachment to the trailer so as to provide more secure attachment. When the connector 10 is to be attached to the trailer the user merely connects the first magnet on the connector 10 with and second magnet on the trailer together.
Whilst provision of one or more magnets on the connector is the preferred way of securing the connector to the trailer, other arrangements may be used.
The shell of the connector may be provided with a clip or other structure that engages a corresponding structure on the trailer, or vice versa. Accordingly the trailer may include a clip into which a portion of the shell is received or the clip may be received in a portion of the shell
The connector in
Referring to
The pin terminal 50 has a wire connection portion 58 for receiving an electrical wire or cable. Similarly the socket terminal 52 has wire connection portion 60 for receiving an electrical wire or cable.
The pin and socket terminals 50, 52 are formed from sheet metal that has been rolled into a cylindrical form, rather than from a solid piece of metal that has been machined as appropriate.
The socket portions 58, 60 have an aperture 62, 64, respectively, that is to allow a screw to pass into the interior of the connection portion and sandwich a cable of wire within between the screw and the opposing wall of the connection portion.
The terminals 50 and 52 used with the plug (and corresponding socket) of
The connection portions 58, 60 are provided with an anti rotation outer surface. In this implementation the connection portions are generally cylindrical but have a portion of the wall pressed outwards to form protrusions 66, 68.
The terminals 50 and 52 may be used in any electrical connector requiring the ability to attach or detach electrical wires. The terminals may be used in a magnetic connector formed of a two part shell.
Referring to
Each through bore 72 also has a radially extending opening 76 that aligns with the apertures 62, 64. The recess 74 and protrusions 66, 68 align the apertures 62, 64 on the terminals with the corresponding opening 76. The openings 76 extend through the carrier and are open at the exterior of the carrier. Screws not show are located in the openings 76 and extend into the respective connection portion of the terminals. The threads of the screws engage the surface of the openings and/or the surface of the apertures 62, 64 and are screwed inwards to trap wires (not shown) between themselves and the opposing wall of the terminal.
In this implementation preferably openings 76 are oversize and the thread of the screws does not engage the material of the carrier 70. If desired the openings 76 may be sized so the thread of the screws does engage the material of the carrier 70. The carrier may be formed with a complementary thread on the openings 76. However, if an appropriate material is used for the carrier the screw may cut a thread on first use.
Once the screws are inserted into the terminals 50, 52, the terminals are retained in the carrier by the screws being located in the openings 76. Axial force applied to the terminal, such as when connecting and disconnecting the plug and socket is transferred from the terminal to the carrier via the screw and so pull out or push out of the terminals cannot occur.
If desired the carrier may be provided with separate threaded components within the openings 76 with which the screws engage. If such components are used these may be threaded metal nuts or similar, preferably embedded in the material of the carrier during manufacture.
A flat plug 100 according to another implementation of the invention is shown in
The plug 100 may be provided with a magnet in a similar manner to the plug of
The bottom shell part 104 has a series of openings 106 into which the pin terminals 102 are received. As seen in
Each opening 106 also has an opening 112 for receiving a screw 114. When the pin terminal 102 is inserted into the opening 106 the opening 112 aligns with opening 116 in terminal 102.
In this embodiment the opening 112 is sized so that the thread of screw 114 engages the opening 112 and screw 114 is retained in the shell 104 by its engagement with the shell 104. The screw is preferably a clearance fit with opening 116 in terminal 102. The screw clamps a wire (not shown) between itself and the opposing wall of the terminal 102 and also retains the terminal within the opening 106 against pull out or push out.
In the preferred form the carrier is formed and the formed rolled terminals are inserted into the carrier. The carrier may be moulded or otherwise formed about the rolled terminals, such as in a plastics injection moulding machine.
A rolled terminal 120 according to another implementation is shown in
The terminal 120 is a pin adapted to be inserted into complementary socket, such as terminal 52 of
The pin terminal 120 has a wire connection portion 124 for receiving an electrical wire or cable.
The wire connection portion 124 is provided with an anti-rotation outer surface. In this implementation the connection portion is generally cylindrical but has a portion of the wall pressed outwards to form protrusion 130.
The wire connection portion 124 has an aperture 128 that is to allow a screw to pass into the interior of the connection portion and sandwich a cable of wire within between the screw and the opposing wall of the connection portion 124.
The connection portion 122 is formed of three arms 132a, b and c. These arms are generally cylindrical and each extends about ⅓ of the way around the circumference. The arms 132 are separated by gaps 134 and thus may flex radially inwards or outwards. This provides a more progressive and more consistent fit between the male and female terminals. Although the preferred implementation has three arms, other numbers of arms may be used, such as 2, 4, 5, 6, etc.
Each arm 132 has a portion 136 of its wall pushed radially outwards that engages the inner surface of a corresponding socket.
The foregoing features of the invention may be combined in any combination of features where features are not mutually exclusive.
The invention provided the cost saving of rolled terminals whilst providing the reusability of a machined terminal.
It will be apparent to those skilled in the art that many obvious modifications and variations may be made to the embodiments described herein without departing from the spirit or scope of the invention.
Unless the context clearly requires otherwise, throughout the description and any claims the words ‘comprise’, ‘comprising’, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/AU2011/000484 | 4/21/2011 | WO | 00 | 5/21/2013 |
Publishing Document | Publishing Date | Country | Kind |
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WO2012/031312 | 3/15/2012 | WO | A |
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PCT International Preliminary Report on Patentability for PCT/AU2011/000484 mailed Nov. 16, 2012. |
Number | Date | Country | |
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20130224978 A1 | Aug 2013 | US |