Patent Application
20050233646
1. Field of the Invention
This invention relates to connectors and, more particularly, relates to an electrical connector for connecting various electrical devices to the electrical socket in a motor vehicle to supply power to devices, such as a wireless telephone and, even more particularly to such an electrical connector that can be firmly secured in such a socket, while being capable of being readily removed.
2. Prior Art
The electrical socket of a vehicle is used today to power many electrical devices. Such sockets are widely employed far beyond the initially-intended purpose of heating a coil to light a cigar or cigarette. One difficulty with the use of a socket of a motor vehicle is that the connector becomes loose in the socket thereby breaking electrical contact, or even worse, causing the connector completely to fall from the socket. Besides obtaining a connection between the socket and the connector, which resists the vibrations of the motor vehicle, there is often a need to have the electrical device supported by the socket. One electrical device that needs such support is a wireless telephone. Wireless phones are increasingly popular and motor vehicle laws, for reasons of safety, prohibit the holding of a wireless phone by the driver when the motor vehicle is in operation. Therefore, a connector which can be secured sufficiently in the socket to hold a wireless phone would provide a substantial service in holding a wireless phone and avoid unwanted alterations to the dashboard of a motor vehicle.
The problem of a connector for use in the socket of a motor vehicle has been dealt with in the past. One such patent is the Nelson et al patent, U.S. Pat. No. 5,569,053 which uses locking fingers to expand against the socket thereby securing the connector in the socket. The locking fingers are displaced outwardly in response to the longitudinal movement of the outer sleeve from a retracted position to a forward position. Such a device provides a positive lock but actuation and release of the locking fingers is achieved by pushing and pulling of the connector which can damage the socket as well as the dashboard of the motor vehicle in which the socket is mounted. The device taught by Nelson et al is also complex and thus expensive to produce.
The objects of this invention are as follows:
A connector which can be secured within and removed from a socket without pushing and pulling against the socket.
A connector which is simple in design.
A connector which is comparatively inexpensive to produce.
A connector which is durable.
A connector which can be secured to a socket with sufficient strength to support an electrical device.
A connector is provided for use with a socket such as used in a motor vehicle for supplying electrical power to an appliance. The connector has an inner end for placement in the socket and an outer end remote from the socket. An expander is provided which has a passageway extending through it. A collet which has an opening through it is mounted on the expander. The expander is adapted to slide within the collet. The collet has a plurality of slots extending from the outer end toward the inner end. A flange is mounted at the inner end of the connector in contact with the collet. A shaft is secured to the flange. The shaft is mounted in the passageway of the expander. The shaft and the expander have interacting means to cause the expander to move along the shaft when the expander is turned. A positive contact is mounted on the shaft at the inner end and a negative contact is mounted on the collet.
Referring now to
The expander 11 has a passageway 27 through it from the inner end 17 to the outer end 13. The passageway 27 is also circular in cross section. Toward the inner end 17, the passageway 27 of the expander 11 is threaded with threads 29 which are comparatively coarse.
Located in the passageway 27 is a shaft 31. The shaft 31 extends from the outer end 13 where the shaft 31 is threaded with an outer thread 33 which is comparatively fine. The outer thread 33 at the outer end 13 is used, as seen in
The shaft 31 which, as stated, is located concentrically within the expander 11, is located along with the expander 11 within a collet 41. The shaft 31 has a channel 43 which is circular in cross section and is concentrically located through it. A groove 45 is also located longitudinally along the length of the shaft 31 and is used as is hereinafter explained. The collet 41 as to its exterior, is a cylindrical member. An opening 47 extends through the collet 41. Toward the outer end 13, the opening 47 in the collet 41 has a cylindrical portion 48, having a diameter comparable to the cylindrical section 25 of the expander 11. The opening 47, toward the inner end 17, has a tapered portion 49 which tapers to a smaller diameter comparable to the tapered section 33 of the adapter 11. The tapered portion 49 of the opening 47 is located generally in the mid section of the collet 41. The opening 47 is cylindrical but tapers to a smaller and smaller diameter as the opening 47 extends toward the inner end 17 so as to cause the expander 11 to expand the collet 41. Through the collet 41 from its exterior surface 51 to the opening 47 are a series of slots 53 extending from the inner end 17 generally half way the length of the collet 41 toward the outer end 13. The slots 53 are preferably equally spaced above the periphery of the collet 41 and preferably number at least four. On the face of the flange 39 which contacts the collet 41, there is a pair of raised ridges 54 shown in the configuration of a cross. The raised ridges 54 engage the slots 53 preventing the collet 41 from rotating in relation to the flange 39.
The shaft 31, at the inner end 17, is rigidly secured to the flange 39. The flange may have an opening through it into which the shaft 31 may be secured or the shaft 31 and the shaft 31 and the flange 39 may be constructed in one piece.
In the channel 43 through the shaft 31 at the inner end 17 beyond the flange 39 there is a positive contact 55 to connect to the positive terminal 57 of the power supply of the vehicle. The positive terminal 57 of the power supply of the vehicle is located in the socket 15 as seen in
The shaft 31 and the collet 41 retain the same linear relationship to one another as the connector is being used. As the expander 11 is turned on the shaft 31, it moves either toward or away from the inner end 17 depending upon the direction that the expander 11 is turned by rotation of the turn collar 19. As the expander 11 moves toward the inner end 17, the tapered section 21 of the expander 11 moves toward the inner end 17, the tapered section 21 of the expander 11 is forced against the tapered portion 41 of the collet 41 forcing the collet 41 to expand. The expansion of the collet 41 toward the inner end 17 is made possible by the slots 53 as the expander 11 turns within the collet 41. The collet 41 thus presses firmly against the socket 15 to secure the connector in the socket 15. By turning the turn collar 19 in the opposite direction, the collet 41 is released and the connector may then be removed from the socket 15. The tightening and releasing of the collet 41 is achieved without pushing and pulling on the socket 15. The collet 41 has a knurled area 65 adjacent to the turn collar 19 which can be held should the connector be sufficiently loose in the socket 15 so that the collet 4d1 will turn with the turn collar 19 unless the collet is held in place.
As seen in
It is to be understood that the drawings and description matter are in all cases to be interpreted as merely illustrative of the principles of the invention, rather than as limiting the same in any way, since it is contemplated that various changes may be made in various elements to achieve like results without departing from the spirit of the invention or the scope of the appended claims.
