Abstract:
A quick-connect system for mechanically and electrically connecting two components therebetween. In an exemplary embodiment, the mechanical quick-connect is comprised of: a receptacle in the first component; a barrel protruding from the second component; and a lock for locking the barrel inside the receptacle. Electrical connection, such as a coaxial connection, can also be obtained between the barrel and receptacle, while in the locked position by using a pin assembly axially located in the barrel. The lock may comprise a tooth and slot configuration, wherein the tooth is in compressive contact with a spring which compression continuously exerts force on the tooth and causes the end of the tooth to engage to the cam slot on the barrel, thereby locking the barrel inside the receptacle. The barrel may be disengaged with a turn that is less than 180 degrees.

Description:
The present application claims the benefit of U.S. Provisional Application Ser. No. 60/407,258, filed Aug. 30, 2002, which application is herein incorporated by reference in its entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to electrical and mechanical connector systems that connect two components together and, more particularly, a connector system for mechanically and electrically connecting an earhook to a behind-the-ear (BTE) hearing device. The connector system of the present invention is useful for both conventional, BTE hearing aids and for cochlear stimulation systems employing BTE speech processors. 
     Implantable cochlear stimulation (ICS) systems are used to help the profoundly deaf perceive a sensation of sound by directly exciting the intact auditory nerve with controlled impulses of electrical current. Ambient sound pressure waves are picked up by an externally worn microphone and converted to electrical signals. The electrical signals, in turn, are processed by a Wearable Signal Receiver and Processor (WP), converted to a pulse sequence having varying pulse widths and amplitudes and transmitted to an implanted receiver circuit of the ICS system. The implanted receiver circuit is connected to an implantable electrode array that has been inserted into the cochlea of the inner ear. The electrical stimulation current generated by the ICS is applied to varying electrode combinations to create a perception of sound. 
     A representative ICS system is provided in U.S. Pat. No. 5,824,022, issued Oct. 20, 1998, for “Cochlear Stimulation System Employing Behind-The-Ear (BTE) Speech Processor With Remote Control.” The &#39;022 patent is incorporated herein by reference. 
     The presently available external devices commonly include an earhook attached to the BTE. The earhook is conventionally attached to the BTE hearing device using a threaded interface and requires the user to screw and unscrew the earhook from the BTE device. This procedure can be cumbersome and time-consuming. In addition, when two earhooks are interchangeably used, attaching and detaching the earhook is even more difficult if a cable is attached to the earhook. 
     Thus, there is a need for an improved connection system for connecting the earhook to the BTE that is simple to operate and more convenient to the user. 
     SUMMARY OF THE INVENTION 
     In accordance with one aspect of the present invention, there is provided a quick-connect, mechanical connector system which can provide physical attachment of two device components. 
     The quick-connect system can comprise: a receptacle, a barrel connector which is dimensioned to fit inside the receptacle, and a lock for locking the barrel inside the receptacle. The lock is configured to engage the barrel connector to the receptacle by inserting the barrel into the receptacle. The lock is configured to disengage the barrel connector from the receptacle by rotationally twisting the barrel by less than 180° and withdrawing the barrel from the receptacle. 
     In particular, the lock comprises a convexly surfaced cam slot recessed onto the end of the barrel, which cam slot can engage a spring-loaded tooth that fits into the cam slot. The spring-loaded tooth is at least partially contained in a spring retaining chamber that is attached to a side wall of the receptacle. The spring-loaded tooth and spring retaining chamber are located on the receptacle wall to permit the spring-loaded tooth to engage the cam slot after the barrel is inserted into the receptacle. Twisting the barrel within the receptacle disengages the tooth from the cam slot and onto a cylindrical, non-recessed portion of the barrel, whereupon the barrel may be withdrawn from the receptacle. Preferably, the convex cam slot is sized and dimensioned on the barrel so that rotationally twisting the barrel by less than a 90° turn releases the lock. 
     Thus, as a feature of the invention, the quick-connect system permits a mechanical connection between two components. Such a mechanical only quick connect may be used, for example, to connect a conventional earhook to the body of a BTE device. 
     In another aspect of the invention, the quick connect may be used to provide both mechanical and electrical connection between two components. This may be accomplished by using the same basic parts as the above described embodiment. However, to achieve a coaxial electrical connection, a pin assembly is also included within the barrel. A spring-loaded, pin contact assembly is placed axially within the barrel such that an end contact for electrical contact is on one end of the pin contact assembly and a depressible, spring-loaded contact pin is located on the other end of the pin assembly. The spring-loaded contact pin contacts a receptacle contact pin for electrical connection. In addition, the tooth in the receptacle provides electrical contact with the barrel to complete an electrical pathway between the receptacle and the barrel connector. A coaxial electrical connection is thereby achieved. 
     The quick connect system with the coaxial electrical connection is particularly useful to connect a “special” earhook and a BTE body. Unlike a conventional earhook, the special earhook may have electrical devices incorporated therein. For example, a special earhook may have incorporated such electrical devices as a telecoil, a microphone, an FM receiver or an input plug. Such special earhooks may need to be swapped quickly and the quick connect of the present system facilitates this requirement, in addition to providing a coaxial electrical connection. 
     In another aspect of the invention, a method is provided for electrically and mechanically attaching a first component with a second component. The method comprises providing a contact pin on a barrel receptacle, a pin contact assembly having a spring-loaded, pin contact and an end contact; inserting a barrel into the barrel receptacle; and locking the barrel into the barrel receptacle by employing a tooth which fits into a cammed slot. Electrical contact is made between the tooth and barrel, which are made from conductive material. Electrical contact is also made between the spring-loaded, contact pin and the receptacle contact pin, thereby providing a coaxial electrical connection. 
     It is thus a feature of the present invention to provide a mechanical and coaxial, electrical connection system that does not require multiple turns to attach or detach two components. The mechanical and electrical connections between two components may be between an earhook and a BTE body. Advantageously, the quick-connect makes attaching an earhook to a BTE body less time-consuming and much more user friendly than a multi-turn threaded connecting system presently available. 
     It is another feature of the present invention that the connection design easily permits an extension or wire to be placed on an earhook without tangling, since multiple turns are not required. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of the present invention will be more apparent from the following more particular description thereof, presented in conjunction with the following drawings wherein: 
         FIG. 1A  depicts a complete behind-the-ear (BTE) hearing device with an earhook attached; 
         FIG. 1B  shows another illustration of the BTE device with the earhook portion detached from the BTE; 
         FIG. 2A  shows cross-sectional views of a standard earhook and four special earhooks, which earhooks can be interchangeably attached to the BTE device; 
         FIG. 2B  shows a cross-sectional view of a special earhook for use with a conventional BTE, or other hearing aid device, that positions a speaker in proximity to the ear canal; 
         FIG. 3  shows, in accordance with the present invention, a side view of a barrel connector of the quick-connect system; 
         FIG. 3A  shows, in accordance with the present invention, a cross-sectional view of the barrel connector and pin contact assembly axially placed in the barrel connector, the view taken along line  3 A— 3 A of  FIG. 3 ; 
         FIG. 3B  shows a front view of the barrel connector of  FIG. 3 ; 
         FIG. 3C  shows a rear view of the barrel connector of  FIG. 3 ; 
         FIG. 3D  shows a cross-sectional view of the barrel and cam slot taken along line  3 D— 3 D of  FIG. 3 ; 
         FIG. 4  shows a side view of the pin contact assembly; 
         FIG. 4A  shows a cross-sectional view of the pin contact assembly shown in  FIG. 4 , taken along line  4 A— 4 A of  FIG. 4 ; and 
         FIG. 5  shows a view of the connection system of the present invention which includes a longitudinal, cross-sectional view of a barrel receptacle, a side view of the barrel inside the barrel receptacle and a lock which is comprised of a spring-loaded tooth recessed into a cammed slot located on the barrel. 
     
    
    
     Corresponding reference characters indicate corresponding components throughout the several views of the drawings. 
     DETAILED DESCRIPTION OF THE INVENTION 
     The following description is of the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of describing the general principles of the invention. The scope of the invention should be determined with reference to the claims. 
     Behind-the-ear (“BTE”) devices refer generally to any hearing device that is placed behind the ears. This includes both hearing aids which merely amplify sound and also more complex, implantable cochlear stimulators (ICS) which have both an external BTE device and an implantable component for directly stimulating cochlear nerves to create a perception of sound. 
     BTEs used in hearing aids and cochlear stimulators are commonly modular. For example, the BTE may consist of separable components such as the BTE body, a battery portion which attaches to the BTE body and an earhook which can attach to the BTE body. Such modularity is desirable for a number of reasons. The ability to change the size and shape of the earhook accommodates the natural variability in ear shapes and sizes. The detachable battery is preferably modular because batteries become depleted and must be changed periodically. Were the battery integrated into the BTE body, that would require opening the BTE body to access the battery—a task that would not be user friendly. 
     The quick-connect system of the present invention can provide both a mechanical attachment and coaxial, electrical connection for BTE hearing devices. 
       FIG. 1A  shows a modular BTE body  10 , a standard earhook  12 , and a detachable battery compartment  14 . The earhook  12  is curved and BTE body  10  continues this curve. The earhook  12  is placed over the top and front of the ear, while the BTE body  10  and battery compartment  14  hangs behind the ear. Various batteries of different sizes may be interchangeably attached to the BTE device  10  depending upon the needs of a user. A more detailed description of a BTE device is found in U.S. Pat. No. 5,824,022, previously incorporated by reference. 
       FIG. 1B , shows an illustration of the earhook  12  detached from the BTE body  10 . Standard earhooks do not contain within them any electronics or devices and thus no electrical connection is needed between such an earhook  12  and BTE body  10 . Hence, with a standard earhook, connector  16  functions merely to mechanically connect the two components together. A conventional mechanical connection such as a multi-turn screw  16  can be employed. An earhook  12  is attached by aligning it relative to the BTE screw  16 , as shown in  FIG. 1B , and rotating the earhook  12  multiple turns to allow entry of screw  16  into the complementary threaded receptacle  38  as shown in  FIG. 2A  (top figure). Surfaces  35  and  36  can provide a friction fit to resist movement between the earhook and the BTE body  10 . 
     As BTE hearing devices have become more sophisticated, however, the earhook  12  is now being increasingly used to contain electrical devices and hence, in those instances, an electrical communication means is necessary between the earhook  12  and the BTE body  10 . These earhooks, having electrical devices are referred to, herein, as “special earhooks.” U.S. patent application Ser. No. 09/785,629, filed Feb. 16, 2001, discloses a number of devices that may be placed into the special earhook of a BTE device. This application is herein incorporated by reference. 
       FIGS. 2A and 2B  summarize the devices disclosed as special earhooks in the &#39;629 patent application.  FIG. 2A  shows these devices in the special earhooks  12   a  through  12   e : a telecoil  18  embedded in the earhook; a microphone  20 ; an FM receiver  22 ; and an extension cable  24  that terminates in an input plug  23 . Lead conductor  42  electrically couples the devices to the mechanical and electrical connector receptacle  40 . 
       FIG. 2B  shows a speaker  25  adapted for use with conventional hearing aids. Conventional hearing aids utilize a speaker in the body of the hearing aid and a passage through an earhook to carry the sound into the user&#39;s ear. Conventionally, the microphone of the hearing aid is also located in the hearing aid body. Because both the microphone and speaker are physically close to each other, some acoustic coupling (feedback) can occur between the microphone and the receiver, thus degrading performance. The special earhook  12   e , however, positions the hearing aid speaker  25  near the tip of the earhook and, thus, closer to the user&#39;s ear, but more distant from the microphone. Lead conductor  42  or conductors carry the signal from the connector  40  to the speaker  25 . 
     Connector  38  is merely a threaded mechanical receptacle, without any electrical connection, since earhook  12  does not have any electrical device incorporated. However, special earhooks  12   a ,  12   b ,  12   c ,  12   d , and  12   e  all require not only a mechanical connection between the earhook  16  and BTE body  10 , but also an electrical connection to the various electrical devices located in the special earhooks. In accordance with the present invention, a method of providing this electrical communication is to use a special connector system  40  and  16  to double not only as a mechanical connector, but also as a coaxial connector. Advantageously, such a dual function connector eliminates the need to provide a separate electrical connector for connecting the devices in the earhook to the BTE body  10 . 
     The coaxial connector system  16  and  40  may use the same thread size and pitch as used in standard earhooks, thus allowing the use of standard earhooks with the BTE device. As shown in  FIG. 1B , the earhook interface surface  35  and a BTE interface surface  36  can provide a friction fit between the earhook  12  and BTE device  10  as the earhook  12  is screwed onto the coaxial connector  16 . However, while a coaxial connection is provided, any connection system that uses threads which requires multiple turns is not user friendly. Such a connection procedure is not only time consuming, but with some special earhooks such as  12   d  which has an extension cord  24 , it can be problematic since the cord can become easily tangled. 
     The present invention provides a quick-connect system which makes detaching the special, as well as standard earhooks, faster and easier and does not require rotating the earhook multiple times. 
       FIGS. 3 ,  3 A,  3 B,  3 C,  3 D,  4 ,  4 A, and  5  illustrate the quick-connect system, in accordance with the present invention. 
       FIG. 5  shows a view of the complete quick-connect system, in accordance with the present invention, which system provides both mechanical and electrical connections between two components, such as an earhook and an BTE body. The mixed illustration show a cross-sectional side view of the barrel receptacle  40  and a side view of the barrel connector  16  with the inserted barrel  44 . 
       FIG. 3  shows the coaxial, barrel connector  16  which is mounted in the BTE device  10  such that the barrel  44  extends from interface surface  36  (as shown in  FIG. 1B ) of BTE body  10 . A square shoulder or flange  45  at the posterior end of the barrel  44  facilitates mounting the barrel connector  16  inside the BTE so that the square shoulder  45  is, in one embodiment, flush with the inside BTE wall surface  36 . Advantageously, using a square shoulder  45  provides a means to rotationally index the coaxial connector  16  relative to the BTE device  10 . The shape of the square shoulder  45  prevents rotational movement inside the BTE once the coaxial connector is mounted. 
       FIG. 3A  shows a cross-sectional view of the barrel connector  16 , taken along line  3 A— 3 A of  FIG. 3  and a view of the pin assembly  31  inside. The round rear  26  of the barrel connector  16  and the barrel  44  are preferably made of bronze, but may be constructed from other conductive material with mechanical strength and characteristics suitable for use as an electrical connector. A convex, cam slot  110  is cut into the anterior end of the barrel  44 . The exterior surface of the pin assembly  31  can have a diameter of about 0.034 inches and be supported by insulative bushings  28  and  30 . The bushing  30  can be attached to the contact end  33  with adhesive to fix the pin assembly  31  to the barrel connector  16 . A spring-loaded contact pin  32  can be depressed into the pin assembly  31 . 
     The pin assembly  31  protrudes at the posterior end at end contact  33 , providing one electrical contact to electronic circuitry in the BTE body  10 . For a coaxial electrical connection, the electronic circuitry in the BTE body can also electrically connect to cylindrical end (or “rear”)  26  of the barrel connector  16 . 
       FIG. 3B  shows a front view of the barrel connector  16 . The square shoulder or flange  45  allows the coaxial connector to be accurately positioned rotationally within the BTE device  10  and then fixed into place to thereby provide counter-rotational resistance. 
       FIG. 3C  shows a rear view of the barrel connector  16 . In this embodiment the rear 26′ of the barrel connector  16  can be shaped as a small, square, instead of a circle. The square shape can be advantageous for anchoring the barrel connector to a BTE device. 
       FIG. 3D  shows a cross-sectional view of the barrel connector  16  taken at line  3 D— 3 D of  FIG. 3 . It can be seen that the cam slot  110  has a convex surface curvature  5  and is recessed in barrel  44 . 
       FIG. 4  shows another view of the pin contact assembly  31  alone. The spring-loaded contact pin  32  protrudes out from pin assembly  31  and is depressible into the pin assembly. The contact end  33  is used to electrically connect to the BTE electronics. 
       FIG. 4A  shows a longitudinal, sectional view of the pin assembly  31  taken along line  4 A— 4 A of  FIG. 4 . The spring  34  is shown pushing the spring-loaded contact pin  32  outwardly from the open end of the outer shell of the contact pin  33 . Both the spring-loaded, contact pin  32  and the contact end  33  are hollow to permit a pin assembly spring  34  to be housed within the contact pin  32  and contact end  33 . 
       FIG. 5  shows the component parts of the complete quick-connect system of the present invention. To summarize, the main components of the system include: (a) a barrel connector  16  having a barrel  44  (b) a barrel receptacle  40  which can receive the barrel  44  and (c) a locking latch  140 . The barrel receptacle  40  is incorporated into one device component, such as a special earhook. The barrel connector  44  is incorporated into another component such as the BTE body  10  at the surface  36 . 
     The barrel  44  is substantially a cylinder having preferably a rounded anterior end  100  that can be inserted into the correspondingly barrel-shaped receptacle chamber  41 . The barrel connector  44  also includes a square stop (or flange)  45  that encircles and divides barrel  44  from the posterior (rear) cylindrical portion  26 . The square stop or flange  45  can abut against the wall of the BTE housing  70  and can be fixed to the BTE housing by various known means such as mechanical fixation or adhesives. Alternatively, the square stop may be inserted partly into the wall  70 . 
     The opening of the barrel receptacle  40  may have an elastomeric O-ring  80  which is attached to and abuts the opening end of receptacle chamber  41 . When barrel  44  is fully inserted into the barrel receptacle  40 , the elastomeric O-ring  80  provides both a compression fit and friction fit with the BTE housing  70  and thereby resists turning and, further, allows the earhook  12  to be positioned over a small range of rotational positions relative to the BTE body  10 . 
     The outer surface of the barrel receptacle  40  can be shaped as a cylinder or any other convenient shape. Specifically, the outside surface wall  46  of the barrel receptacle  40  can have ridges, protrusions and other extensions which can help fix the barrel receptacle to the earhook  10 , which earhook may be made from a moldable polymer. The barrel receptacle  40  can be made from materials such as metals, ceramics or high density plastics. 
     The spring retaining enclosure  120  is integrated into one part of the barrel receptacle wall portion  47 . This spring retaining enclosure contains a spring  130  which provides a constant, spring-loaded outward pressure on tooth  108 . One side of the tooth  108  is designed to retain one end of the spring  130  by having a circular recess  109 , wherein one end of the spring  130  is confined. The end of the tooth  108  enters the receptacle chamber  41  of the barrel receptacle  40  through a hole in receptacle wall portion  47 . When fully extended outward, the tooth  108  can extend slightly past the inner surface of the chamber wall  47 . When barrel  44  is inserted into the receptacle chamber  41 , the curved part of the tooth meets the barrel causing the tooth to first retract as the barrel pushes the tooth away, then the tooth snaps into cam slot  110  on the barrel  44 , thus locking the barrel into the barrel receptacle and, hence, the BTE body  10  to a special earhook,  12   a–e  (shown in  FIGS. 2A and 2B ). 
     Referring again to  FIG. 3D , it can be seen that the cam slot  110  on barrel  44  has a convex surface curvature  5  to permit the tooth  108  to slide off the cammed surface as the barrel  44  is axially rotated by about 45° to 90°. By rotating the barrel  44  in either rotational direction by about 45° to 90°, the tooth  108  is pushed back into the spring retaining enclosure  120  and the tooth makes contact with the non-recessed portion of the cylindrical surface of the barrel  44 . When this is done, the tooth is no longer in a locked mode and the barrel  44  can then be retracted from the barrel receptacle  46 , thereby detaching the barrel from the barrel receptacle, and in the process, detaching the special earhook  12  from the BTE body  10 . 
     Locking the barrel  44  into the receptacle chamber  41  not only establishes a mechanical connection between the barrel and barrel receptacle, but also can establish an electrical connection, such as for instance, a coaxial connection. The quick-connect system of the present invention, as explained previously, is especially suited for use with special earhooks, such as depicted in  12   a–e  in  FIGS. 2A and 2B . Such special earhooks often require that they be quickly detached and immediately replaced by another special earhook. In addition, some special earhooks may have dangling wires which make the conventional mode of attachment, i.e., multiple turns with screws and threaded receptacles, too time consuming and awkward. 
     Referring once again to  FIG. 5 , a first electrical connection is provided through receptacle contact pin  151  which contacts the spring-loaded pin contact  32  (as shown in  FIG. 3A ), and a second electrical connection is provided when tooth  108  contacts barrel  44 . Wall  46 , barrel  44  and rear  26  of barrel connector  16  are therefore in electrical contact providing the second electrical connection. The bushing  48  electrically insulates the barrel receptacle wall  46  from the coaxial contact pin  50  and also provides physical support to the coaxial contact pin  50 . 
     Various alternative embodiments of the barrel connector  16  and the barrel receptacle  40  will be apparent to those skilled in the art and are within the scope of the invention. In particular, in one embodiment of the invention, the quick connect may be used as a mechanical connection or as a mechanical and electrical connection. Thus, as shown in  FIG. 2A , if connection  16  is the quick connect of the present invention, having a coaxial electrical connection, it may be connected to special earhooks  12   a  through  12   d  and, furthermore, quick connect  16  may be compatibly connectable to conventional earhook  12 , although the electrical connection will be unused. 
     Alternatively, the quick connect may be made solely as a mechanical quick connect for two components. In such a case, the quick connect must include: a barrel receptacle; a barrel connector, and a lock. No pin assembly is needed. The receptacle is made part of the first component. The barrel connector is dimensioned to fit inside the barrel receptacle and the barrel connector is incorporated as part of the second component. The lock may be a configuration to engage the barrel connector to the receptacle when the barrel is inserted into the receptacle. The lock should also be configured to disengage the barrel connector from the receptacle by rotationally twisting the barrel by less than 180° and withdrawing the barrel from the receptacle. Preferably, the barrel should disengage with a twist of less than about 90° and, more preferably, less than about 45°. An embodiment of a locking system that permits disengagement with about a 45° turn includes a convex surfaced slot recessed into the end of the barrel and a spring-loaded tooth, dimensioned to fit into the cam slot, as previously described. 
     In another aspect of the invention, a method is provided for electrically and mechanically attaching a first component with a second component. The method comprises: providing a contact pin on a barrel receptacle, and providing a pin contact assembly having a spring-loaded, pin contact and an end contact; inserting a barrel into the barrel receptacle; and locking the barrel into the barrel receptacle by employing a tooth which fits into a cammed slot. Electrical contact is made between the tooth and barrel, which are made from conductive material. Electrical contact is also made between the spring-loaded, contact pin and the receptacle contact pin, thereby providing a coaxial electrical connection. 
     Thus, in summary, the present invention is a connector system and method for attaching both a standard earhook and special earhooks to a BTE body. The special earhooks, which provide a variety of functions can be conveniently and quickly attached and detached to a BTE device. 
     Although the quick-connect of the present invention has been described in the context of its application to a BTE device, it will be appreciated that a coaxial quick-connect system, in accordance with the present invention, also has utility to any application where two components must be quickly and easily attached and detached. The quick-connect of the present invention may be used as a purely mechanical connection system or as a system that provides, simultaneously, both mechanical and electrical connections. These other applications are intended to come within the scope of the present invention. 
     While the invention herein disclosed has been described by means of specific embodiments and applications thereof, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.