Electrical connector

Abstract: An electrical connector 14 for wiring is disclosed that can be used outdoors such as on a bicycle. The electrical connector 14 is electrically coupled to one end of an electrical cord 36a. The electrical connector 14 basically has a terminal housing 51, at least one terminal pin 52, an inner casing 53, and an outer casing 54. The terminal housing 51 has an insulated body with a first end 58, a second end 60 and at least one terminal bore 62 longitudinally extending between the first and second ends 58, 60. Preferably, the terminal housing 51 has a plurality of terminal bores 62 with one of the terminal pins 52 being retained within each one of the terminal bores 62 of the terminal housing 51. Each terminal bore 62 has a first bore section with a cross-section formed by an intersection of a rectangle and a circle. Each terminal pin 52 has a first contact end and a second connection end with a bent portion forming a cord receiving recess located on a first longitudinal side of the second connection end such that the cord receiving recess lies within a main plane of the second connection end. The electrical cord 36a has an electrical conductor fixedly coupled to each terminal pin to form an electrical connection therebetween. The inner casing 53 has a tubular side wall with the terminal housing located in a first open end of the tubular side wall 92 and the electrical conductor 37 located in a second open end of the tubular side wall 92. The tubular side wall 92 has at least one side opening, preferably two side openings. The outer casing 54 is molded over portions of the terminal housing 51 and the tubular side wall 92 of the inner casing 53. The outer casing 51 is molded such that the material extends into the side opening of the tubular side wall of the inner casing 53.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention This invention generally relates to an electrical connector. More specifically, the present invention relates an electrical connector that provides improved durability and waterproofmg as well as an improved electrical connection. 2. Background Information Bicycling is becoming an increasingly more popular form of recreation as well as a means of transportation. Moreover, bicycling has also become a very popular competitive sport for both amateurs and professionals. Whether the bicycle is used for recreation, transportation or competition, the bicycle industry is constantly improving the various components of the bicycle. The drive train of the bicycle has been redesigned over the past years. Specifically, manufacturers of bicycle components have been continually improving shifting performance of the various shifting components such as the shifter, the shift cable, the derailleur, the chain and the sprocket. Recently, bicycles have been provided with an electronic drive train for smoother shifting. These electronic drive trains include a rear multi-stage sprocket assembly with a motorized rear derailleur and a front multi-stage sprocket assembly with a motorized front derailleur. These derailleurs are electronically operated by a cycle computer for automatically and/or manually shifting of the derailleurs. The cycle computer is also often coupled to other components that are electrically controlled or operated. In this type of an arrangement, electrical wires or cords are utilized to transmit the electrical current to and from the various components. These electrical wires are often connected to the components by electrical connectors. Since the bicycle is typically utilized outdoors, the electrical connections of the electrical connectors are exposed to a variety of weather conditions. The electrical connections can often be contaminated so as to degrade performance of the shifting and/or operation of the electrical control component. If the electrical connections get too dirty, the bicycle will not properly shift. Moreover, since the electrical connections are exposed to adverse weather conditions, it is important that the electrical connectors provide a good solid connection so that they can operate even though they may become slightly contaminated. US-A-6 142 805, which is considered on the closest prior art, shows a waterproof connector including a rigid plastic body supporting a hard plastic insert which in turn supports a plurality of electrical contacts. An electrical cable extends inside the body and is connected to the electrical contacts. A plastic potting compound fills the body and encases the cable and the connection to the electrical contacts. The plastic potting compound has to be inserted before a plastic overmold is applied between cable and body, which makes manufacturing complicated and expensive. In view of the above, there exists a need for an electrical connector that provides improved durability and waterproofing as well as an improved electrical connection and which overcomes the above mentioned problems in the prior art. This invention addresses this need in the prior art as well as other needs, which will become apparent to those skilled in the art from this disclosure. SUMMARY OF THE INVENTION One object of the present invention is to provide an electrical connector that provides improved durability and waterproofing. Another object of the present invention is to provide an electrical connector with an improved electrical connection. The foregoing objects can be attained by providing an electrical connector according to claim 1 of the invention. The electrical connector is electrically coupled to one end of an electrical cord. The electrical connector basically has a terminal housing, at least one terminal pin, an inner casing, and an outer casing. The terminal housing has a first end and a second end with at least one terminal bore longitudinally extending between the first and second ends. The electrical cord has an electrical conductor fixedly coupled to each terminal pin to form an electrical connection therebetween. The inner casing has a tubular side wall with the terminal housing located in a first open end of the tubular side wall and the electrical conductor located in a second open end of the tubular side wall. The tubular side wall has at least one side opening, preferably two side openings. The outer casing is molded over portions of the terminal housing and the tubular side wall of the inner casing. The outer casing is molded such that the material extends into the side opening of the tubular side wall of the inner casing. Preferably, the terminal housing has a plurality of terminal bores with one of the terminal pins being retained within each one of the terminal bores of the terminal housing. Each terminal bore has a first bore section with a cross-section formed by an intersection of a rectangular portion and a circular portion. The circular portion of the cross-section of the first bore section has a diameter that is larger than a width of the rectangular portion of the cross-section of the first bore section such that the circular portion of the cross-section of the first bore section extends outwardly from a pair of sides of the rectangular portion of the cross-section of the first bore section. Each terminal pin has a first contact end and a second connection end with a bent portion forming a cord receiving recess located on a first longitudinal side of the second connection end such that the cord receiving recess lies within a main plane of the second connection end. In accordance with another aspect of the present invention, an electrical terminal housing comprising an insulated body including a first end, a second end and a terminal bore extending longitudinally between the first and second ends, the terminal bore having a first bore section with a cross-section formed by an intersection of a rectangular portion and a circular portion. The first bore section extends from the first end. The circular portion of the cross-section of the first bore section has a diameter that is larger than a width of the rectangular portion of the cross-section of the first bore section such that the circular portion of the cross-section of the first bore section extends outwardly from a pair of sides of the rectangular portion of the cross-section of the first bore section. In accordance with yet another aspect of the present invention an electrical terminal pin comprising a first end; and a second end having a bent portion forming a cord receiving recess located on a first longitudinal side of the second end such that the cord receiving recess lies within a main plane of the second end. These and other objects, features, aspects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Referring now to the attached drawings which form a part of this original disclosure: Figure 1A is a side elevational view of a bicycle with an electronically controlled drive train that uses an electrical connector in accordance with a first embodiment of the present invention; Figure 1B is a top plan view of the handlebar portion of the bicycle with a shift control unit and a pair of shifting devices coupled thereto; Figure 1C is a diagrammatic illustration of the control system that uses electrical connectors of the present invention; Figure 2 is a perspective view of the male electrical connector coupled to the shift control unit and the female electrical connector of the present invention, prior to being coupled together; Figure 3 is a partially exploded perspective view, similar to Figure 2, of the male connector and the female connector in accordance with the present invention; Figure 4 is a longitudinal cross-sectional view of the female electrical connector taken along section 4-4 of Figure 3; Figure 5 is a perspective view of the female electrical connector in accordance with the present invention, prior to molding of the outer casing thereon; Figure 6 is a partially exploded perspective view of the female electrical connector in accordance with the present invention as seen in Figures 2-3; Figure 7 is a left end elevational view of the terminal housing for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 8 is a side elevational view of the terminal housing illustrated in Figure 7 for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 9 is a right end elevational view of the terminal housing illustrated in Figures 7 and 8 of the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 10 is a longitudinal cross-sectional view of the terminal housing illustrated in Figures 7-9 as seen along section line 10-10 of Figure 7; Figure 11 is a left end elevational view of one of the terminal pins for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 12 is a side elevational view of the terminal pin illustrated in Figure 11 for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 13 is a bottom edge elevational view of the terminal pin illustrated in Figures 11 and 12 for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 14 is a partial end elevational view of one of the terminal bores of the terminal housing illustrated in Figures 7-10 with one of the terminal pins retained therein; Figure 15 is a diagrammatic perspective view of one of the terminal bores of the terminal housing and one of the terminal pins that are about to receive a receptor pin of the male electrical connector; Figure 16 is a partial end elevational view of one of the terminal bores of the terminal housing with the terminal pin located therein and electrically coupled to the receptor pin of the male electrical connector; Figure 17 is a diagrammatic perspective view of the terminal bore and the terminal pin engaged with a receptor pin of the male electrical connector; Figure 18 is a side elevational view of the inner casing for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 19 is a right end elevational view of the inner casing illustrated in Figure 18 for the electrical connector illustrated in Figures 2-6 in accordance with the present invention; Figure 20 is a top plan view of the inner casing illustrated in Figures 18 and 19 for the electrical connector illustrated in Figures 2-6; Figure 21 is a longitudinal cross-sectional view of the inner casing illustrated in Figures 18-20 as seen along section line 21-21 of Figure 18; Figure 22 is a transverse cross-sectional view of the inner casing illustrated in Figures 18-21 as seen along section line 22-22 of Figure 18; and Figure 23 is a transverse cross-sectional view of the inner casing illustrated in Figures 18-22 as seen along section line 23-23 of Figure 18. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring initially to Figures 1A-1C, 2 and 3, a bicycle 10 is illustrated with an electronically controlled drive train 12 (Figures 1A-1C) that uses an electrical connector 14 (Figures 2-3) in accordance with a first embodiment of the present invention, as discussed below. Bicycle 10 and its various components are well known in the prior art, except for the electrical connector 14 of the present invention. Thus, the bicycle 10 and its various components will not be discussed or illustrated in detail herein, except for the components that relate to the present invention. Moreover, various conventional bicycle parts such as brakes, additional sprockets, etc., which are not illustrated and/or discussed in detail herein, can be used in conjunction with the present invention. As used herein, the following directional terms "forward, rearward, upward, above, downward, vertical, horizontal, below and transverse" as well as any other similar directional terms refer to those directions of a bicycle in its normal riding position. Accordingly, these terms, as utilized to describe the present invention in the claims, should be interpreted relative to bicycle 10 in its normal riding position. Referring to Figures 1A-1C, the drive train 12 basically includes a rear multi-stage sprocket assembly 16 with a motorized rear derailleur or chain shifting device 18, a front multi-stage sprocket assembly 20 with a motorized front derailleur or chain shifting device 22, a chain 24 extending between the rear multi-stage sprocket assembly 16 and the front multi-stage sprocket assembly 20, and a pair of pedals 26 mounted to rotate the front multi-stage sprocket assembly 20. An electronic control system 30 basically operates the drive train 12. The electronic control system 30 basically includes a shift control unit 32 with a junction box or connection unit 34. The shift control unit 32 and the junction box 34 are electrically coupled together by an electrical control cord 36a which in turn are electrically coupled to electrical control cords 36b that are electrically coupled to the motorized derailleurs 18 and 22. The shift control unit 32 is also electrically coupled to shifting devices 40a and 40b via electrical cords 41a and 41b, respectively. As illustrated in Figure 1C, the electronic control system 30 can also be utilized to control the front and rear suspension and/or other components of the bicycle which are not shown. In the illustrated embodiment of Figure 1C, the electrical cord 36a is a fifteen-line cord in which only thirteen of the lines or conductors are utilized. More specifically, the electrical control cords 36b are each six-line cords with only five of the lines or conductors being utilized. The electrical control cord 36b' for the rear suspension is preferably a six-line cord with only two lines or conductors being utilized. In this illustrated embodiment, the electrical connectors 14 are fifteen-pin electrical connectors with only some of the pins being utilized. The electrical connectors 14' and 15' are six-pin electrical connectors with only some of the pins being utilized. In the case of the rear suspension system, the electrical connectors 14' and 15' only utilize two of the terminal pins. In the case of the front suspension system, the electrical connectors 14' and 15' utilize only four of the pins. Of course, it will be apparent to those skilled in the art from this disclosure that these connectors 14, 14', 15 and 15' can be utilized with other bicycle components and in other types of arrangements as needed and/or desired. For example, the bicycle 10 of Figure 1A does not have front and rear suspension systems. Therefore, these portions would not be included in the bicycle of Figure 1A. Rather, the cycle computer or control unit 32 is connected to sensor 44 via an electrical cord 36b'in which only two of the conductors are utilized. The shift control unit or cycle computer 32 preferably includes a microcomputer formed on a printed circuit board that is powered by a battery unit. The microcomputer of the shift control unit 32 includes a central processing unit (CPU), a random access memory component (RAM), a read only memory component (ROM), and an I/O interface. The various components of the microcomputer are well known in the bicycle field. Therefore, the components used in the microcomputer of the shift control unit 32 will not be discussed or illustrated in detail herein. Moreover, it will be apparent to those skilled in the art from this disclosure that the shift control unit 32 can include various electronic components, circuitry and mechanical components to carryout the present invention. Of course, it will be apparent to those skilled in the art from this disclosure that the shift control unit 32 can have a variety of configurations, as needed and/or desired. Preferably, the shift control unit 32 is a cycle computer that provides or displays various information to the rider via a display 38 and that operates the motorized derailleurs 18 and 22. Thus, the drive train 12 of bicycle 10 is operated or electronically controlled by the shift control unit 32. More specifically, the shift control unit 32 is a cycle computer that electrically operates the motorized derailleurs 18 and 22 either automatically or manually as explained below. One example of an automatic shifting assembly that can be utilized with the present invention is disclosed in U.S. Patent No. 6,073,061 to Kimura, which is assigned to Shimano Inc. In the manual mode, shifting of each of the motorized derailleurs 18 and 22 is preformed by via manual down and up shift devices 40a and 40b. While the shift devices 40a and 40b illustrated herein utilizes down and up shift buttons, it will be apparent to those skilled in the art from this disclosure that various other types of shift devices can used, such as levers, without departing from the scope of the invention as defined in the appended claims. Depressing one of the shift buttons of the shift devices 40a and 40b generates a predetermined operational command that is received by the central processing unit of the shift control unit 32. The central processing unit of the shift control unit 32 then sends a predetermined operational command or electrical signal to move or shifting one of the motorized derailleurs 18 and 22. In the automatic mode, shifting of each of the motorized derailleurs 18 and 22 is preferably at least partially based on the speed of the bicycle. Thus, the shift control unit 32 further includes at least one sensing/measuring device or component 42 that provides information indicative of the speed of the bicycle 10 to its central processing unit of the shift control unit 32. The sensing/measuring component 42 generates a predetermined operational command indicative of the speed of the bicycle 10. Of course, additional sensing/measuring components can be operatively coupled to central processing unit of the shift control unit 32 such that predetermined operational commands are received by the central processing unit (CPU) of the shift control unit 32 to operate the motorized derailleurs 18 and 22 or other components. The sensing/measuring component 42 can be, for example, a speed sensing unit that includes a sensor 44 and a magnet 45. The sensor 44 is preferably a magnetically operable sensor that is mounted on the front fork of the bicycle 10 and senses the magnet 45 that is attached to one of the spokes of the front wheel of the bicycle 10. The sensor 44 can be a reed switch or other component for detecting the magnet 45. Sensor 44 generates a pulse each time wheel of the bicycle 10 has turned a pre-described angle or rotation. In other words, the sensor 44 detects the rotational velocity of the front wheel of the bicycle 10. As soon as sensor 44 generates the pulse or signal, a pulse signal transmission circuit sends this pulse signal to the central processing unit of the shift control unit 32 to determine whether the chain 24 should be up shifted or down shifted. Thus, the sensor 44 and the magnet 45 form a sensing device or measuring component of the shift control unit 32. In other words, the sensor 44 outputs a bicycle speed signal by detecting a magnet 45 mounted on the front wheel of the bicycle 10. Thus, speed information is sent to the battery operated electronic shift control unit 32 to operate the motorized derailleur 18 and 22. The junction box 34 preferably includes a single power input or electrical control cords 36a for receiving signals from the shift control unit 32 and a pair of power outputs or electrical control cords 36b for sending signals to the rear and front motorized derailleur 18 and 22. The power input operatively couples the shift control unit 32 to the junction box 34. Preferably, one power output or electrical control cord 36b operatively couples the rear derailleur 18 to the junction box 34 and the other power output or electrical control cord 36b operatively couples to the front derailleur 22 to the junction box 34. Preferably, the electrical control cords 36a and 36b use the electrical connectors, such as ones similar to the electrical connector 14 of the present invention and the mating electrical connector 15. In the illustrated embodiment, the electrical connectors 14 mate with the mating male electrical connectors 15 that are coupled to the shift control unit 32 and the junction box 34, as seen in Figures 1C, 2 and 3. The male electrical connector 15 is relatively conventional, and therefore, it will not be discussed and/or illustrated in detail herein. Basically, the male electrical connector 15 has a receptor housing 46 with fifteen receptor pins 48. The receptor pins 48 have a circular cross-section, and are arranged in a pattern to mate with the electrical connector 14, as discussed below. The receptor housing 46 preferably has an annular flange 49 for releasably retaining the electrical connector 14 thereto via a snap-fit. The receptor housing 46 is constructed of a non-conductive material, such as a hard, rigid plastic material. The receptor pins 48 are constructed of a conductive material. While the electrical connector 14 is especially useful in outdoor applications such as on bicycles, it will be apparent to those skilled in the art from this disclosure that the electrical connector 14 can be used in other applications without departing from the scope of the invention as defined in the appended claims. In the illustrated embodiment, the electrical connector 14 is electrically coupled to each end of the electrical cord 36a that is connected to the mating electrical connectors 15 of the shift control unit 32 and the junction box 34. The electrical cord 36a has a plurality of electrical conductors 37 with one end of the electrical conductors 37 fixedly coupled to the terminal pins 52 to form an electrical connection therebetween. In the illustrated embodiment, the electrical cord 36a has fifteen electrical conductors 37. The electrical connector 14 basically has a terminal housing 51, a plurality of terminal pin 52, an inner casing 53, and an outer casing 54. The electrical connector 14 in the illustrated embodiment is a female electrical connector or receptacle. Of course, it will be apparent to those skilled in the art from this disclosure that the electrical connector 14 can be a male electrical connector or a plug without departing from certain aspects of the present invention. However, certain aspects of the present invention are specifically directed to a female electrical connector such as the female electrical connector 14 illustrated in Figures 2-6. Also, in the illustrated embodiment, the electrical connector 14 has fifteen terminal pins 52. Of course, it will be apparent to those skilled in the art from this disclosure that the number of terminal pins can be fewer or more depending upon the particular application of the electrical connector. For example, the electrical connectors 14' are identical to electrical connectors 14, except that electrical connectors 14' have been reduced in diameter and only has six terminal pins. Since the electrical connector 14 has fifteen terminal pins 52, the electrical cord 36a is a multi-connector cable having fifteen individually insulated conductors with the exposed ends of the conductors electrically coupled to the terminal pins 52 for creating an electrical connection therewith. As seen in Figures 4 and 7-10, the terminal housing 51 has an insulated body 56 with a first end 58, a second end 60 and a plurality of terminal bores 62 longitudinally extending between the first and second ends 58 and 60. The terminal housing 51 is constructed out of a non-conductive material. For example, the terminal housing 51 is constructed of a hard, rigid plastic material for housing the terminal pins 52. Preferably, terminal housing 51 is molded as a one-piece, unitary member constructed of a substantially hard, rigid non-metallic material such as nylon. Preferably, the terminal housing 51 has a plurality of terminal bores 62 with one of the terminal pins 52 being frictionally retained or press-fitted within each one of the terminal bores 62 of the terminal housing 51. As seen in Figure 10, each terminal bore 62 has a first bore section 62a and a second bore section 62b. The first bore section 62a has a cross-section formed by an intersection of a rectangle or a rectangular portion R and a circle or circular portion C as best seen in Figures 9, 14 and 16. The second bore section 62b has a cross-section formed only by the rectangle R. The rectangular portion R is dimensioned to correspond with the cross-section of the terminal pins 52 for frictionally retaining the terminal pins 52 therein. The circular portion C is the size of the receptor pin 48 of the mating male electrical connector 15. Thus, the circular portion C has a diameter that is larger than the width of the rectangular portion R such that the circular portion C extends outwardly from a pair of sides of the rectangular portion R. The circular portion C of the cross-section of the first bore section 62a acts as a centering device to ensure good electrical contact between the receptor pins 48 and the terminal pins 52. More specifically, the circular portion C is centered within the rectangular portion R as best seen in Figures 14-17. Preferably, the terminal housing 51 has a generally cylindrical shape with a pair of protrusions or detents 64 formed adjacent the second end 60 and a pair of annular flanges 66 and 68 that form an annular recess 70 therebetween. As discussed below, the protrusions or detents 64 and flange 66 form part of a snap-fit that couples the terminal housing 51 to the inner casing 53. The detents 64 are preferably diametrically opposed, i.e., spaced 180° apart along the outer surface of the terminal housing 51. The annular flange 68 and annular recess 70 are designed to ensure that outer casing 54 is securely molded onto terminal housing 51, as explained below in more detail. Referring now to Figures 11 - 13, the terminal pin 52 is preferably constructed of any conductive material that is normally utilized in the electrical connector art. Preferably, the terminal pins 52 are each formed from a sheet metal material that is stamped to form the shape as seen in Figures 11-13. Each terminal pin 52 has a first contact end 78 and a second connection end 80 with a bent portion 82. A cord receiving recess 84 is formed by the bent position 82 and is located on a first longitudinal side of the second connection end 80 such that the cord receiving recess 84 lies within a main plane P of the second connection end 80. The cord receiving recess 84 is designed to receive a portion of the end of one of the electrical connectors 37 of the electrical control cord 36a. Preferably, the electrical conductor 37 is soldered within the cord receiving recess 84 to form a secure connection therebetween. The bent portion 82 also forms a stop 86 on a second longitudinal side of the connection end portion 80. The stop 86 is designed to limit axial movement of the terminal pin 52 within the terminal bore 62. More specifically, when the terminal pin 52 is inserted into one of the terminal bores 62 of the terminal housing 51 from the second end 60, the stop 86 contacts the second end 60 of the terminal housing to limit the axial or longitudinal movement of the terminal pin 52 within the terminal bore 62. Once the terminal pin 52 is fully inserted into the terminal bore 62, the contact end 78 has a receptor pin slot 88 that is located in the first bore section 62a of the terminal bore 62. The receptor pin slot 88 of each terminal pin 52 is centered within the first bore section 62a so that the circular portion C ensures a good electrical connection between the receptor pin 48 and the terminal pin 52. The receptor pin slot 88 is basically formed by a pair of tines 90 that diverge towards each other as they approach the free end of the contact end 78 of the terminal pin 52. Accordingly, as seen in Figures 14-17, when the receptor pin 48 is inserted into the circular portion C of the first bore section 62a of the terminal bore 62, the tines 90 are biased or resiliently deflected radially outwardly from the circular portion C to the rectangular portion R to ensure a good electrical connection therebetween. Referring now to Figures 18-23, the inner casing 53 has a tubular side wall 92 with the terminal housing 51 located in a first open end 94 of the tubular side wall 92 and the electrical conductors 37 located in a second open end 95 of the tubular side wall 92. The tubular side wall 92 has at least one side opening, preferably two side openings 96. The two side openings 96 are preferably diametrically opposed 180° apart. These side openings 96 are relatively large and extend at least approximately half of the longitudinal length of the inner casing 53 in the area of the electrical connections between the electrical conductors 37 and the terminal pins 52. These side openings 96 are designed to allow the material of the outer casing 54 to freely flow into the interior of the inner casing 53 so as to completely cover the ends of the electrical conductors 37 and the connection ends 80 of the terminal pins 52. This ensures a good waterproof connection therebetween. Moreover, by completely encasing the electrical connections between the electrical conductors 37 and the terminal pins 52, the electrical connections are very durable and less resistant to detachment due to vibrations. The tubular side wall 92 is also preferably provided with a pair of notches 98 which are formed as rectangular openings. These notches 98 form a part of a snap-fit arrangement between the terminal housing 51 and the inner casing 53. The notches 98 are diametrically opposed from each other, i.e., spaced 180° apart around the inner casing 53. The inner casing 53 is constructed from a relatively rigid material with a limited amount of resiliency. In other words, due to the tubular shape of the inner casing 53, the tubular side wall 92 can flex radially outwardly upon the insertion of the terminal housing 51 being inserted into the first open end 94 of the inner casing 53. Insertion of the terminal housing 51 into the first open end 94 causes the protrusions or detents 64 of the terminal housing 51 to engage the inner surface of the tubular side wall 92 of the inner casing 53. The protrusion 64 causes the tubular side wall 92 to flex slightly outwardly until the protrusions 64 engage the notches 98. Preferably, the protrusions 64 are substantially ramp-shaped members with abutment surfaces 64a facing in a longitudinal direction towards the first end 58 of the terminal housing 51. The notches 98 have a mating abutment surface 98a that faces in an axial direction towards the second open end 94 of the inner casing 53. When the abutment surfaces 64a and 98a contact each other, relative axial movement of the terminal housing 51 away from the inner casing 53 is prevented. Moreover, the annular flange 66 of the terminal housing 51 abuts the first open end 94 to prevent further inward axial movement of the terminal housing 51 relative to the inner casing 53. In the preferred embodiment, the tubular side wall 92 has a large cylindrical section 92a for receiving the terminal housing 51 and a smaller cylindrical section 92b for receiving the electrical control cord 36a therein. A frustoconical transition portion 93c extends between the large cylindrical section 92a and the smaller cylindrical section 92b to provide for a smooth transition therebetween. The second open end 95 preferably has a smaller diameter than the first open end 94 due to the inwardly extending abutment flange 95a. The abutment flange 95a is designed to engage a retaining ring 39 that is located on the end of the electrical cord 36a. Referring again to Figures 2-4, the outer casing 54 is molded over an end portion of the electrical cord 36a, the portion of the terminal housing 51 adjacent the second end 60, and the tubular side wall 92 of the inner casing 53. The outer casing 54 also extends into the side openings 96 of the tubular side wall 92 of the inner casing 53. The outer casing 54 is a non-conductive material such as a plastic or elastomeric material. During the molding process, the material of the outer casing 54 is molded over the entire inner casing 53, as well as portions of the electrical control cord 36a and the terminal housing 51. Accordingly, the interface between the terminal housing 51 and the first open end 94 of the inner casing 53 is sealed to prevent contaminants from entering therebetween. Moreover, the material of the outer casing covers both annular flanges 66 and 68 and extends into the annular recess 70 to ensure a watertight seal. These side openings 96 are designed to allow the material of the outer casing 54 to freely flow into the interior of the inner casing 53 so as to completely cover the ends of the electrical conductors 37 and the connection ends 80 of the terminal pins 52. This ensures a good waterproof connection therebetween. Moreover, by completely encasing the electrical connections between the electrical conductors 37 and the terminal pins 52, the electrical connections are very durable and less resistant to detachment due to vibrations. The outer casing 54 is preferably spaced from the exterior surface of the terminal housing 51 between the annular flange 68 and the first end 58 of the terminal housing 51. Thus, an annular space 100 is formed between terminal housing 51 and outer casing 54 for receiving a portion of the male connector 15 therein. Preferably, the outer casing 54 has an annular abutment flange 102 located at its open end for mating with the corresponding annular flange 49 of the male connector 15. Preferably, the material of the outer casing 54 is constructed of a resilient material so that the annular flange 49 of the male connector 15 can expand the outer casing 54 radially outwardly so as to pass beneath the annular flange 102 of the outer casing 54. The terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed. These terms should be construed as including a deviation of at least ± 5% of the modified term if this deviation would not negate the meaning of the word it modifies. While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. Furthermore, the foregoing description of the embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

Claims: An electrical connector (14, 15, 14', 15'), especially for a bicycle, comprising: a terminal housing (51) having a first end (58) and a second end (60) with at least one terminal bore (62) longitudinally extending between said first and second ends (58, 60); at least one terminal pin (52) being retained within said bore of said terminal housing (51); an electrical cord (36a) having at least one electrical conductor (37) fixedly coupled to said terminal pin (52) to form an electrical connection therebetween; an inner casing (53) having a tubular side wall (92) with said terminal housing (51) located in a first open end (94) of said tubular side wall and said electrical conductor (37) located in a second open end (95) of said tubular side wall (92); and an outer casing (54) molded over a portion of said electrical cord (36a), said tubular side wall (92) of said inner casing (53) and said second end (95) of said terminal housing (51); characterized in that said tubular side wall (92) has at least one side opening (96), and said outer casing (54) extends into said side opening (96) of said tubular side wall (92) of said inner casing (53) and material of said outer casing (54) is encasing said electrical connections between the at least one electrical conductors (37) and the at least one terminal pins (52). An electrical connector (14, 15; 14', 15') according to claim 1, wherein said inner casing (53) has a pair of said side openings (96). An electrical connector (14, 15; 14', 15') according to claim 1 or 2, wherein said side openings (96) are diametrically arranged. An electrical connector (14, 15; 14', 15') according to claims 1 to 3, wherein said side openings (96) extend at least one-half of a longitudinal length of said tubular side wall (92) between said first and second open ends (54, 95). An electrical connector (14, 15; 14', 15') according to claims 1 to 4, wherein said side openings (96) extend approximately one-half of a circumferential length of said tubular side wall (92). An electrical connector (14, 15; 14', 15') according to claims 1 to 5, wherein said inner casing (53) is coupled to said terminal housing (51) by a snap-fit. An electrical connector (14, 15; 14', 15') according to claim 6, wherein said snap-fit is formed by one of said inner casing (53) and said terminal housing (51) having a pair of diametrically opposed notches (98), and the other of said inner casing (53) and said terminal housing (51) having a pair of diametrically opposed protrusions (64). An electrical connector (14, 15; 14', 15') according to claim 7, wherein said diametrically opposed notches (98) are formed on said inner casing (53) and said diametrically opposed protrusions (64) are formed on said terminal housing (51). An electrical connector (14, 15; 14', 15') according to claims 6 to 8, wherein said diametrically opposed notches (98) are openings. An electrical connector (14, 15; 14', 15') according to claims 1 to 9, wherein said terminal bore (62) having a first bore section (62a) with a cross-section formed by an intersection of a rectangular portion (R) and a circular portion (C), said first bore section (62a) extending from said first end of said terminal housing (51), said circular portion (C) of said cross-section of said first bore section (62a) having a diameter that is larger than a width of said rectangular portion (R) of said cross-section of said first bore section (62a) such that said circular portion (C) of said cross-section of said first bore section (62a) extends outwardly from a pair of sides of said rectangular portion (R) of said cross-section of said first bore section (62a). An electrical connector (14, 15; 14', 15') according to claims 1 to 10, wherein said terminal bore (62) further includes a second bore section (62b) with a rectangular cross-section extending from said first bore section (62a) to said second end of said terminal housing (51). An electrical connector (14, 15; 14', 15') according to claims 1 to 11, wherein said circular portion (C) of said cross-section of said first bore section (62a) is located in a central part of said rectangular portion (R) of said cross-section of said first bore section (62a). An electrical connector (14, 15; 14', 15') according to claims 1 to 12, wherein said terminal housing (51) further includes a plurality of said terminal bores (62) extend longitudinally between said first and second ends (58, 60) with a plurality of said terminal pins (52) located therein. An electrical connector (14, 15; 14', 15') according to claims 1 to 13, wherein said terminal pin (52) includes a first end (78), and a second end (80) having a bent portion (82) forming a cord receiving recess (84) located on a first longitudinal side of said second end (80) such that said cord receiving recess (84) lies within a main plane (P) of said second end (80). An electrical connector (14, 15; 14', 15') according to claims 1 to 14, wherein said second end (80) has a stop (86) formed thereon. An electrical connector (14, 15; 14', 15') according to claims 1 to 15, wherein said stop (86) is located on a second longitudinal side of said second end (80) that faces in an opposite direction from said first longitudinal side. An electrical connector (14, 15; 14', 15') according to claim 14, wherein said first end (78) has a receptor pin slot (88). An electrical connector (14, 15; 14', 15') according to claims 1 to 17, wherein said first end (78) and said second end (80) are constructed as a one-piece, unitary member from a conductive sheet material with a predetermined non-deformed thickness. An electrical connector (14, 15; 14', 15') according to claim 18, wherein said cord receiving recess (84) has a depth that is substantially equal to said predetermined non-deformed thickness of said sheet material.

Inventors: NISHIMOTO NAOHIRO, NISHIMOTO, NAOHIRO
Applicants: SHIMANO KK, SHIMANO INC.
Application year: 2001
Main classification: H01R13
IPC codes: H01R13