Connector connecting structure

Abstract: A first connector 2 is provisionally retained in a connection stand-by position by provisionally-retaining mechanisms 41 provided between the first connector 2 and a holder 1, and when connecting the first and second connectors 2 and 4 together, the provisionally-retained condition of the first connector is released. Draw drive mechanisms 42 for drawing the first connector 2 to the connection stand-by position when releasing the connection between the first and second connectors 2 and 4 is provided between the first and second connectors 2 and 4. The second connector 4 is provided with retaining portions 43 which maintain a draw-driven condition of the first connector 2, achieved by the draw drive mechanisms 42, before the first connector 2 is drawn to the connection stand-by position by the draw drive mechanisms 42, and also allows the draw-driven condition of the first connector 2 to be released when the first connector 2 is drawn to the connection stand-by position.

Description: BACKGROUND OF THE INVENTION This invention relates to a connector connecting structure for electrically connecting first and second mating connectors together. In order to improve the connectability of a multi-pole connector which have many terminals, and offers a large connecting resistance, there has been proposed a sliding connection-type electric connector (as disclosed in Japanese Patent Unexamined Publication No. 4-319271) comprising a holder (slide member) which supports a first connector inserted therein, and has a plurality of engagement projections formed on upper and lower wall surfaces thereof, a second connector of a generally rectangular shape which has a recess for receiving the holder, and openings generally parallel to side walls thereof, and an operating member of a generally U-shape having a cam groove for engagement with the engagement projection of the holder, and the first and second connectors are connected together by sliding the operating member. More specifically, in the above sliding connection-type electric connector, the first connector is inserted and supported in the holder, and then a plate portion of the operating member is inserted into the opening formed in the side wall of the second connector, and the engagement projection of the holder, supported in the first connector, is positioned with respect to the cam groove in the operating member, and is engaged therein, and in this condition the operating member is pushed or moved in a longitudinal direction of the holder, so that the engagement projection of the holder is slidingly moved along the cam groove, thereby connecting the first connector, supported in the holder, to the second connector. In the connector of the above structure, the second connector, with which the operating member is engaged, is provisionally engaged with the first connector supported in the holder, and the engagement projection, formed on the holder, is positioned with respect to the cam groove in the operating member, and then this operating member is pushed in the longitudinal direction of the holder so as to connect the first connector to the second connector. Thus, at least two-stage operation must be carried out, and therefore there is encountered a problem that the connecting operation is cumbersome. In order to simplify the connector connecting operation by omitting the above positioning operation, there may be proposed a structure in which the connector is retained at the fitting stand-by position where the engagement projection of the holder, supporting the first connector, is positioned with respect to the cam groove in the operating member engaged with the second connector, and when effecting the connector connecting operation, the two connectors are moved into the connecting position while forcibly releasing the above provisionally-retained condition. With this structure, however, when the connectors are to be again connected together, the connector can not be returned to the above fitting stand-by position, and therefore there is encountered a problem that the connector connecting operation can not be effected repeatedly. SUMMARY OF THE INVENTION In view of the above problems, it is an object of this invention to provide a connector connecting structure in which a connector connecting operation can be effected repeatedly. According to the invention, there is provided a connector connection structure according to claim 1. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a preferred embodiment of a connector connection structure of the present invention; Fig. 2 is an exploded, perspective view showing the specific structure of a first connector; Fig. 3 is a side-elevational, cross-sectional view showing a condition in which the first connector is retained on a holder by retaining portions; Fig. 4 is a perspective view of an important portion of the connector connection structure; Fig. 5 is a cross-sectional view of an important portion of the connector connection structure; Fig. 6 is a cross-sectional view showing a condition in which the first connector is provisionally-retained in a connection stand-by position; Fig. 7 is a cross-sectional view showing the structure of a draw drive mechanism; Fig. 8 is a perspective view showing the specific structure of a second connector; Fig. 9 is a horizontal cross-sectional view showing a condition before the first and second connector are connected together; Fig. 10 is a cross-sectional view showing a first connector connection step; Fig. 11 is a cross-sectional view showing a second connector connection step; Fig. 12 is a horizontal cross-sectional view showing a third connector connection step; Fig. 13 is a horizontal cross-sectional view showing a connected condition of the connectors; Fig. 14 is a cross-sectional view showing a first connector connection release step; Fig. 15 is a cross-sectional view showing a second connector connection release step; Fig. 16 is a cross-sectional view showing another embodiment of a connector connection structure of the invention; Figs. 17A and Fig. 17B are explanatory views of the operation of the above embodiment; and Fig. 18 is a perspective view showing a further embodiment of a connector'connection structure of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fig. 1 shows a preferred embodiment of a connector connecting structure of the present invention. This connector comprises a holder 1 mounted on a mounting portion S, such as a stay member in an automobile, a first connector 2 slidably supported by this holder 1, a second connector 4 mounted on a circuit board 3 of an electronic unit 22, and swingable or pivotal levers 5 for driving the second connector 4 in a direction to connect the same to the first connector 2. As shown in Fig. 2, the holder 1 has a tubular shape, and comprises a pair of upper and lower horizontal plates 6, and a pair of right and left side plates 7, and the holder 1 is fitted into a mounting hole in the mounting portion S, and is fixed thereto by fastening means such as screws. A guide groove 10 is formed in each of the horizontal plates 6, and an engagement pin 9, formed on an outer surface of the swingable lever 5 at a rear end thereof, is engageable in the guide groove 10. This guide groove 10 has an introduction portion 10a extending rearwardly from the front side of the holder 1, a drive groove portion 10b of an arcuate shape extending rearwardly inwardly from a rear end of the introduction portion 10a, and a retaining groove portion 10c extending rearwardly from a rear end of the drive groove portion 10b. The drive groove portion 10b of the guide groove 10 and the engagement pin 9 cooperate with each other to provide a drive portion which swingingly displaces the swingable lever 5 in accordance with a sliding displacement of the first connector 2 as described later. In this embodiment, although the drive groove portion 10b of the guide groove 10 has an arcuate shape, this drive groove portion, formed in the holder 1, may linearly extend rearwardly inwardly from the rear end of the introduction portion 10b, or may extend in a curved (e.g. parabolic) manner. The guide groove 10, formed in the upper horizontal plate 6, and the guide groove 10, formed in the lower horizontal plate 6, are arranged in a point-symmetrical manner (that is, symmetrically with respect to a point), and the swingable lever 5, mounted on the upper side of the first connector 2, and the swingable lever 5, mounted on the lower side of the first connector 2, are swingingly displaceable in opposite directions, respectively. More specifically, when viewed from the front side of the holder 1, the guide groove 10, formed in the upper horizontal plate 6, is provided at the right side thereof, and the drive groove portion 10b extends left obliquely. When viewed from the front side of the holder 1, the guide groove 10, formed in the lower horizontal plate 6, is provided at the left side thereof, and the drive groove portion 10b extends right obliquely. Thus, the two drive groove portions 10b are arranged reversely. As shown in Fig. 3, a pair of slits 12a with a predetermined width are formed respectively in right and left end portions of each of the horizontal plates 6 of the holder 1 to provide retaining portions 12 for retaining the first connector 2 in a front connection stand-by position. A retaining step portion 12b for facing a projection 17, formed on the rear end of the first connector 2, is formed at a distal end of the retaining portion 12. A front surface of each projection 17 on the first connector 2 abuts against a rear surface of the retaining step portion 12b formed on the associated retaining portion 12 of the holder 1, thereby preventing the first connector 2 from being withdrawn forwardly. The retaining step portion 12b has a slanting (tapering) surface 12c, and has a tapering configuration. The first connector 2 comprises a male connector housing 14 which is inserted and slidably held in the holder 1, and a plurality of female terminals 15 mounted respectively in terminal receiving chambers in the connector housing 14. The projections 17 for retaining engagement with the respective retaining step portions 12b are formed respectively at the upper, lower, right and left surfaces of the rear end of the connector housing 14. As shown in Figs. 4 and 5, provided between the holder 1 and the first connector 2 are provisionally-retaining mechanisms 41 which provisionally retain the first connector 2 in the connection stand-by position so as to prevent the first connector 2 from being forced into the holder 1 before a connection operation (described later) is effected. Provided between the first connector 2 and the second connector 4 are draw drive mechanisms 42 which draw the first connector 2 into the connection stand-by position when the connection between the first and second connectors 2 and 4 is to be released. Retaining portions 43 for retaining the respective draw drive mechanisms 42 in a draw-driven condition are provided at the second connector 4. The provisionally-retaining mechanism 41 comprises a provisionally-retaining arm 18 projecting forwardly from a rear end portion of the side wall of the holder 1, and a step portion 19 formed on an inner surface of a side wall of the connector housing 14 of the first connector 2. A pair of upper and lower projections 18a are formed at a distal end of the provisionally-retaining arm 18, and abut against a rear end surface of the step portion 19 to provisionally retain the first connector 2 in the front connection stand-by position, as shown in Fig. 6. A tapering (inwardly slanting) surface 19a is formed at the step portion 19 of the connector housing 14, and when releasing the connection, the tapering surface 19a abuts against a rear end of the provisionally-retaining projection 18a to swingingly displace the provisionally-retaining arm 18 inwardly. A triangular projection 18b, having a tapering (outwardly slanting) surface, is formed at the distal end of the provisionally-retaining arm 18, and is disposed between the two projections 18a, and this projection 18b and the retaining portion 43, formed on an inner surface of a side wall of a connector housing 20 of the second connector 4, jointly constitute a provisional retainment release mechanism which when releasing the connection between the first and second connectors 2 and 4, swingingly displaces the distal end portion of the provisionally-retaining arm 18 inwardly, thereby releasing the provisionally-retained condition of the second connector 4 achieved by the provisionally-retaining mechanism 41. The draw drive mechanism 42 comprises a first engagement arm 44, extending forwardly from the rear end portion of the first connector 2, and a second engagement arm 45 extending forwardly from the rear end portion of the second connector 4, and an engagement projection 44a is formed at a distal end of the first engagement arm 44, and an engagement projection 45a for engagement with the engagement projection 44a is formed at a distal end of the second engagement arm 45. As shown in Fig. 7, when the second connector 4 is pulled in a connection release direction, with the two engagement projections 44a and 45a engaged with each other, the first connector 2 is drawn from the connection position (i.e., a rear position in the holder 1) to the front connection stand-by position. The two engagement projections 44a and 45a have respective pairs of slanting (tapering) surfaces which swingingly displace the distal end portion of the first engagement arm 44 outwardly to bring the engagement projections 44a and 45a into engagement with each other when connecting the two connectors 2 and 4 together, and swingingly displace the distal end portion of the first engagement arm 45 to release the engagement between the engagement projections 44a and 45a when releasing the connection between the connectors 2 and 4. As shown in Fig. 8, the second connector 4 comprises the female connector housing 20 for fitting on the connector housing 14 of the first connector 2, and a plurality of male terminals 21 mounted in terminal receiving chambers in the connector housing 20. The connector housing 20 is fixedly secured to the circuit board 3 by screws or the like, and connection portions 21a of the male terminals 21 extend outwardly from the rear side of the connector housing 20, and are connected by soldering or the like to conductor portions on the circuit board 3 (see Fig. 1). The second connector 4 and the circuit board 3 are mounted within a casing of the electronic unit 22. A pair of driven pins 23 are formed respectively on upper and lower walls of the connector housing 20, and are driven by the swingable levers 5, respectively, and a pair of slits 24 are formed respectively in these upper and lower walls in such a manner that the two slits 24 can be disposed in registry with swing pivots 11 of the swingable levers 5, respectively. As shown in Fig. 9, the swingable levers 5 are swingably supported on the connector housing 14 of the first connector 2 by the respective swing pivots 11 (each comprising a support pin or the like) in such a manner that the swingable levers 5 can be disposed respectively in registry with the guide grooves 10 formed in the holder 1. The engagement pin 9 is formed on the outer surface of each swingable lever 5 (that is, the upper surface of the upper swingable lever 5, and the lower surface of the lower swingable lever 5) at the rear end thereof, and can be fitted in the guide groove 10. An engagement groove 25 is formed in the reverse (inner) surface of each swingable lever 5 5 (that is, the lower surface of the upper swingable lever 5, and the upper surface of the lower swingable lever 5) at a front end portion thereof, and the driven pins 23, formed on the connector housing 20 of the second connector 4, are engageable in the engagement grooves 25, respectively. The engagement groove 25 in the swingable lever 5 has an opening portion 25a serving as an introduction portion for the driven pin 23, and an operating groove portion 25b continuously extending rearwardly from the opening portion 25a toward the inner side of the swingable lever 5. The distance from the operating groove portion 25b to the swing pivot 11 is decreasing progressively from its front end toward its rear end, and with this arrangement the operating groove portion 25b and the driven pin 23 of the second connector 4 cooperate with each other to provide an operating portion which transmits a driving force, inputted to the swingable lever 5 from the above-mentioned drive portion, to the second connector 4, thereby moving the second connector 4 in a direction to connect the same to the first connector 2. More specifically, the distance from the operating groove portion 25b to the swing pivot 11 is so determined that the operating groove portion 25b approaches the swing pivot 11 progressively from its front end toward its rear end, and with this arrangement when the first and second connectors 2 and 4 are to be connected together, the first connector 2 is forced or pushed into the holder 1 to be slidingly displaced, and in accordance with this sliding displacement of the first connector 2, each driven pin 23 is drawn toward the associated swing pivot 11, thereby moving the second connector 4 toward the first connector 2. The position of the drive groove portion 10b of each guide groove 10 relative to the associated swing pivot 11, the position of the operating groove portion 25b of each engagement groove 25 relative to the associated swing pivot 11, and their configurations are so determined that the amount of movement of the second connector 4 in the above connecting direction is smaller than the amount of pushing of the first connector 2 into the holder 1. With this arrangement, the driving force, inputted to the swingable lever 5 from the drive portion, is increased, and is transmitted to the driven pin 23 of the second connector 4 from the operating groove portion 25b. For connecting the first connector 2 of the above structure and the second connector 4 of the above structure together, the first connector 2, having the female terminals 15 mounted in the male connector housing 14, is opposed to the front opening in the holder 1 as shown in phantom in Fig. 3, and then the connector housing 14 is pushed in a direction of an arrow to be inserted into the holder 1, thereby setting the first connector 2 in the connection stand-by position as indicated in solid lines in Fig. 3. More specifically, in accordance with the insertion of the first connector 2 into the holder 1, the projections 17 of the connector housing 14 are pressed respectively against the slanting surfaces 12c of the retaining portions 12 formed on the horizontal plates 6 of the holder 1, and elastically deform these retaining portions 12. Then, when the projections 17 pass respectively past the retaining step portions 12b of the retaining portions 12, and are received in the holder 1, and the rear ends of the step portions 19, formed respectively on the inner surfaces of the side walls of the first connector 2, are abutted respectively against the front surfaces of the projections 18a of the provisionally-retaining arms 18 formed on the holder 1 as shown in Fig. 6, and in this condition the first connector 2 is provisionally retained in the connection stand-by position. When the first connector 2 is thus inserted, the engagement pins 9, formed respectively at the rear ends of the swingable levers 5, are introduced respectively into the guide grooves 10 in the holder 1, and the engagement pins 9 are disposed respectively at the rear end portions of the introduction portions 10a of the guide grooves 10. Then, the holder 1 is fixedly secured to the mounting portion S of a vehicle body, and then the electronic unit 22, having the second connector 4 mounted thereon, is opposed to the first connector 2, and is pushed, so that the connector housing 20 of the second connector 4 is fitted on the connector housing 14 of the first connector 2, thereby electrically connecting the first connector 2 and the second connector 4 together. In accordance with the connection of the second connector 4 to the first connector 2, the engagement projection 45a of each second engagement arm 45, formed on the second connector 4, enters the holder 1 toward the rear side thereof while displacing the engagement projection 44 of the second engagement arm 44 outwardly, so that the two engagement projections can be engageable with each other, as shown in Fig. 10. Further, when the projection 18b of the provisionally-retaining arm 18 is inwardly displaced by the retaining portion 43 of the second connector 43, the provisionally-retained condition of the first connector 2, achieved by the provisionally-retaining mechanism 41, is forcibly released, so that the first connector 2 can be slidingly displaced to the rear connection position, as shown in Fig. 11. Then, when the first connector 2 is pushed rearwardly by the second connector 4, the first connector 2 is slidingly displaced rearwardly along support portions of the holder, and also the driven pins 23 of the second connector 4 are introduced respectively into the engagement grooves 25 of the swingable levers 5, and thus are engaged with the swingable levers 5, respectively, as shown in Fig. 12. In this condition, when the second connector 4 is further pushed to slidingly displace the first connector 2 rearwardly, the engagement pins 9 of the swingable levers 5, supported on the first connector 2, slide respectively along the drive groove portions 10b of the guide grooves 10, so that the rear end portions of the swingable levers 5 move inwardly toward the rear end of the holder 1, and as a result the swingable levers 5 are swingingly displaced about the respective swing pivots 11. In accordance with the swinging displacement of each swingable lever 5, the associated driven pin 23 on the second connector 4 slides along the operating groove portion 25b formed in the front end portion of the swingable lever 5, so that the driven pin 23 is drawn toward the swing pivot 11, and the second connector 4 is moved toward the first connector 2. The amount of movement of the second connector 4 driven by the swingable levers 5 in the connecting direction is smaller than the amount of displacement of the first connector 2 which swingingly displaces the swingable levers 5, and therefore the driving force, inputted to each swingable lever 5 from the drive portion, is increased, and is transmitted to the associated driven pin 23 from the operating groove portion 25b. As a result, in accordance with the driving forces inputted respectively to the driven pins 23 from the drive groove portions 25b of the swingable levers 5 in accordance with the sliding displacement of the first connector 2, the second connector 4 is pushed toward the first connector 2 with a large force, so that the first connector 2 and the second connector 4 are positively connected together. Then, at the final stage of the connection of the second connector 4 to the first connector 2, the engagement pin 9 of each swingable lever 5 is introduced into the retaining groove portion 10c of the associated guide groove 10, and moves straight toward the rear end of the holder 1 as shown in Fig. 13, so that the first connector 2 and the second connector 4 are slidingly displaced in unison along the support portions of the holder 1, without swingingly displacing the swingable levers 5. For releasing the connection between the first connector 2 and the second connector 4, the electronic unit 22 is pulled to slidingly displace the second connector 4 into the connection release position, so that the swingable levers 5 are swingingly displaced in directions opposite to the swinging directions during the connecting operation, and the swingable levers 5 and the first connector 2 are slidingly displaced forwardly, and then the two connectors 2 and 4 are disconnected from each other. Namely, when the second connector 4 is pulled rearwardly, the first connector 2 is drawn to the front side of the holder 1, with the engagement projection 44a of each first engagement lever 44 engaged with the engagement projection 45a of the associated second engagement lever 45, as shown in Fig. 14. Then, in accordance with the sliding movement of the second connector 4, the retaining portion 43, formed on the inner side of the side wall thereof, abuts against the projection 18b of the provisionally-retaining arm 18 to push this projection 18b inwardly, thereby swingingly displacing the distal end portion of the provisionally-retaining arm 18 inwardly. As a result, the step portion 19 of the first connector 2 is allowed to slide over the projection 18a of the provisionally-retaining arm 18, so that the first connector 1 can be slidingly displaced to the front side of the holder 1. Before the step portion 19 of the first connector 2 passes past the projection 18a of the provisionally-retaining arm 18, and is drawn to the initial connection stand-by position, the distal end portion of the provisionally-retaining arm 18 is held in an inwardly-pushed condition by the retaining portion 43 of the second connector 4, and therefore the swinging displacement of the first engagement arm 44 is inhibited by the provisionally-retaining arm 18, and the two engagement projections 44a and 45a are kept engaged with each other, thus preventing the first and second connectors 2 and 4 from being disengaged from each other. Then, as shown in Fig. 15, when the step portion 19 of the first connector 2 passes over the projection 18a of the provisionally-retaining arm 18, and is drawn to the initial connection stand-by position, the inward pushing of the provisionally-retaining arm 18 by the retaining portion 43 of the second connector 4 is released, and also the inhibition of the swinging displacement of the first engagement arm 44 by the provisionally-retaining arm 18 is released, and therefore the engagement between the two engagement projections 44a and 45a is released in accordance with the force to pull the first connector 2. Namely, the draw-driven condition of the first connector 2, achieved by the draw drive mechanisms 42, is released, so that the second connector 4 can be disconnected from the first connector 2. As described above, the first connector 2 is provisionally retained in the front connection stand-by position by the provisionally-retaining mechanisms 41 each comprising the provisionally-retaining arm 18 of the holder 1 and the step portion 19 of the first connector 2, and this provisionally-retained condition is released when the first and second connectors 2 and 4 are to be connected together. In this connector connecting structure, the draw drive mechanisms 42, which draw the first connector 2 to the connection stand-by position when releasing the connection between the first and second connectors 2 and 4, are provided between the first and second connectors 2 and 4, and therefore when releasing the connection between the first and second connectors 2 and 4 by pulling the second connector 4 connected to the first connector 2, the first connector 2 can be slidingly displaced to the front side of the holder 1 by the draw drive mechanisms 42 each comprising the first engagement arm 44 and the second engagement arm 45, and the first connector 2 can be automatically returned to the front connection stand-by position. The second connector 2 is provided with the retaining portions 43 which maintain the draw-driven condition of the first connector 2, achieved by the draw drive mechanisms 42, before the first connector 2 is drawn to the connection stand-by position by the draw drive mechanisms 42, and also allow the draw-driven condition of the first connector 2 to be released when the first connector 2 is drawn to the connection stand-by position. Therefore, even if an external force, limiting the movement of the first connector 2, is applied during the time when the first connector 2 is drawn toward the front side of the holder 1, and is moved to the connection stand-by position by the draw drive mechanisms 42, the retaining portions 43 prevent the disengagement of the second connector 4 before the first connector 2 is returned to the connection stand-by position, and when releasing the connection between the two connectors 2 and 4, the first connector 2 can be positively moved to the connection stand-by position by the draw drive mechanisms 42. Therefore, in the connector having the swingable levers 5, when the two connectors 2 and 4, once disconnected from each other, are to be again connected together, each swingable lever 5 can be set in the initial position where the open portion 25a of the engagement groove 25 in the swingable lever 5 is opposed to the driven pin 23 formed on the second connector 4, and therefore by the use of these swingable levers 5, the first and second connectors 2 and 4 can be positively moved to the connection position. The step portion 19 of the first connector 2 may serve as a retaining portion, in which case by this step portion 19, the provisionally-retaining arm 18 is held in a position to inhibit the swinging movement of the first engagement arm 44, thereby maintaining the draw-driven condition of the first connector 2 achieved by the draw drive mechanism 42. In the above embodiment, there are provided the provisional retainment release mechanisms each comprising the projection 18a of the provisionally-retaining arm 18 and the retaining portion 43 of the second connector 4, and when connecting the first and second connectors 2 and 4 together, the provisionally-retaining mechanism 41 is driven by this provisional retainment release mechanism, thereby forcibly releasing the provisionally-retained condition of the first connector 2. Therefore, before the two connectors 2 and 4 are connected together, the first connector 2 can be stably held in the connection stand-by position by the provisionally-retaining mechanisms 41, and also when connecting the two connectors 2 and 4 together, the provisionally-retained condition of the first connector 2 can be easily and positively released by the provisional retainment release mechanisms, so that the first connector 2 can be slidingly displaced along the holder 1, thereby shifting the two connectors 2 and 4 into the connected condition. The provision of the above provisional retainment mechanisms may be omitted, in which case for example, each provisionally-retaining arm 18 is elastically deformed in accordance with the pushing force, applied from the second connector 4 to the first connector 2, thereby releasing the provisionally-retained condition achieved by the provisionally-retaining mechanism. In this case, however, there are encountered problems that the provisionally-retained condition of the first connector 2 is unstable, and that the provisionally-retaining arm 18 is liable to be damaged. Therefore, it is preferred to provide the provisional retainment release mechanisms each comprising the projection 18b of the provisionally-retaining arm 18 and the retaining portion 43 of the second connector 4. In the above embodiment, the first connector 2 is supported by the holder 1, mounted on the mounting portion S, for sliding movement in its connecting direction, and the swingable levers 5 are swingingly displaceable in accordance with the sliding displacement of the first connector 2, and the driving force is increased in accordance with the swinging displacement of the swingable levers 5, and is transmitted to the second connector 4, thereby driving the second connector 4 in the direction to connect the same to the first connector 2. With this structure, by the simple operation, that is, merely by pushing the second connector 4 relative to the first connector 2 in the direction to connect the same thereto, a large connecting force can be imparted to the two connectors 2 and 4. Therefore, even in the multi-pole connector which includes many female terminals 15, mounted in the first connector 2, and many male terminals 21 mounted in the second connector 4, and requires a large connecting force, the two connectors 2 and 4 can be positively shifted into the connected condition with one touch. And besides, the second connector 4 is mounted on the reverse side of the electronic unit 22, such as a meter unit, an air-conditioning unit and a navigation unit of the automobile, and the first connector 2 is mounted on the bottom of the mounting hole in which the electronic unit 22 is mounted. Therefore, even when the hand of the operator can not be inserted into the connecting portion of the two connectors 2 and 4, the two connectors 2 and 4 can be connected together easily and positively. In the above embodiment, each swingable lever 5 is provided between the inner surface of the holder 1 and the outer surface of the first connector 2 which face each other, and therefore the swingable levers 5 do not project beyond the connector-mounting portion, thus preventing the formation of any dead space, but are allowed to be swingingly displaced. And besides, the swingable lever 5 has a plate-like configuration, and has a small thickness, and this prevents the vertical dimension of the connector from being increased. In the above embodiment, the swingable levers 5 are provided in adjacent, facing relation to the upper and lower inner surfaces of the holder 1, respectively, and are disposed in a point-symmetrical manner. Therefore, with the simple structure, the uniform connecting forces can be applied to the various portions of the two connectors 2 and 4, so that the two connectors can be properly connected together. More specifically, where the width of the connector is large, the swingable levers 5 are provided respectively at the opposite side portions thereof, and the connecting forces can be caused to act respectively on the opposite side portions on the diagonal line of the connector, and this effectively prevents the improper connection which would otherwise result from the localized application of the connecting force to one side portion of the second connector 4. In the above embodiment, the swingable levers 5, provided in adjacent, facing relation to the upper and lower inner surfaces of the holder 1, are swingingly displaceable in the opposite directions, respectively, and therefore the driving forces, transmitted respectively from the two swingable levers 5 to the second connector 4, are exerted in the opposite directions, respectively, as indicated by arrows in Fig. 12, and therefore the widthwise components of the drive forces, transmitted respectively from the two swingable levers 5 to the second connector 4, cancel each other. Therefore, in accordance with these driving forces, the second connector 4 can be slidingly displaced straight along the holder 1, and can be properly connected to the first connector 2. In the above embodiment, at least one pair of swingable levers 5 of the same configuration are provided in adjacent, facing relation to the opposed surfaces of the holder 1, and the opposed swingable levers 5 are disposed in an inverted manner with respect to their opposite sides. Therefore, the number of the component parts can be reduced, and the productivity can be enhanced, and further the directions of swinging motion of the two swingable levers 5 can be opposite, so that the second connector 4 can be slidingly displaced straight as described above. Instead of the above structure, there may be provided a structure in which the swingable lever 5 is provided on only one of the upper and lower sides of the first connector 2, or there may be provided a structure in which a pair of right and left swingable levers 5 are provided on each of the upper and lower sides of the first connector 2. Where the pair of swingable levers 5 are provided on each side, the directions of swinging motion of these levers do not always need to be opposite, but the two swingable levers 5 may be swingingly displaceable in the same direction. In the above embodiment, the retaining portions 12 for preventing the first connector 2 from being withdrawn forwardly are formed on the horizontal plates 6 of the holder 1, and the projections 17, corresponding respectively to the retaining step portions 12b of the retaining portions 12, are formed on the connector housing 14 of the first connector 2, as shown in Fig. 3. Therefore, by abutting the projections 17 respectively against the retaining step portions 12b, the holder 1 and the first connector 2 can be kept in the stably-connected condition. The retaining step portion 12 has the slanting surface 12c formed at its inner surface, and has the tapering configuration, and the slit 12a is provided between the horizontal plate 6 of the holder 1 and each retaining portion 12, and each projection 17 on the connector housing 14 can be pressed against the slanting surface 12c of the associated retaining step portion 12b to elastically deform the retaining portion 12. In this case, the connection of the first connector 2 to the holder 1 can be easily effected with one touch. By elastically deforming the retaining portions 12, the first connector 2 can be withdrawn outwardly from the holder 1. As described above, each guide groove 10, formed in the holder 1, has the retaining groove portion 10c at its rear end portion, and the engagement pins 9, introduced respectively into the retaining groove portions 10c, are moved straight rearwardly. With this structure, at the final stage of the connection of the second connector 4 to the first connector 2, the swingable levers 5 will not be swingingly displaced, and the first connector 2 and the second connector 4 are slidingly displaced in unison along the support portions of the holder 1. Therefore, even when a force, tending to disconnect the first and second connectors 2 and 4 from each other, is applied, so that each engagement pin 9 moves back and forth in the associated guide groove 10, any drive force to swingingly displace the swingable levers 5 will not be applied, and therefore the two connectors 2 and 4 are stably kept in the connected condition. And besides, within the range of the retaining groove portions 10c, the first connector 2, the second connector 4 and the slide members 5 move in unison back and forth relative to the holder 1, and therefore there is achieved an advantage that even if there is a small variation in the amount of pushing of the electronic unit 22, the two connectors 2 and 4 can be shifted into the completely-connected condition. Instead of the above structure in which each of the guide grooves 10 in the holder 1 has the retaining groove portion 10c so that at the final stage of the connection of the second connector 4 to the first connector 2, the first connector 2 and the second connector 4 cab be slidingly displaced in unison in the holder 1, there may be provided a structure in which a retaining groove portion 25c of an arcuate shape, which is equidistant from the swing pivot 11 of the swingable lever 5 throughout its length, extends continuously from the operating groove portion 25b of the engagement groove 25, as shown in Fig. 16. In this structure, when the second connector 4 is to be connected to the first connector 2, the swingable levers 5 are swingingly displaced in accordance with the sliding movement of the second connector 4, and then each driven pin 23, formed on the second connector 4, is introduced into the associated retaining groove portion 25c as shown in Fig. 17A, and in this condition even when each swingable lever 5 is further swingingly displaced, the first connector 2 and the second connector 4 are slidingly displaced in unison along the holder 1 since the distance between each driven pin 23 and the associated swing pivot 11 will not vary, as shown in Fig. 17B. Therefore, the distance L between the position (Fig. 17A) where the driven pin 23 is introduced into the retaining groove portion 25b of the engagement groove 25 and the position (Fig. 17B) where the driven pin 23 reaches the end of the retaining groove portion 25b serves as a play for the connection of the second connector 4 to the first connector 2, and even if the push position at the final stage of the connection of the second connector 4 to the first connector 2 is displaced forwardly or rearwardly within the range of the distance L because of an manufacturing error of the connectors or the like, the two connectors 2 and 4 can be always shifted into the completely-connected condition. It is not always necessary to mount the second connector 4 (which is to be connected to the first connector 2 supported on the mounting portion S) on the circuit board 3 provided in the electronic unit 22, but the connector housing of the second connector 4 may be formed integrally on a casing of an electric connection box or the like. Alternatively, as shown in Fig. 18, a second connector 4, comprising a female connector housing 20 and male terminals 27 connected at their rear ends to a harness 26, may be connected directly to the first connector 2. The holder 1 and the first connector 2 do not always need to be supported on the mounting portion S, but the holder 1 and the first connector 2, while held by the operator, may be connected directly to the second connector 4. In the above embodiment, although the first connector 2, slidably supported by the holder 1, is mounted on the mounting portion S of the vehicle body while the second connector 4 to be connected to the first connector 2 is mounted on the electronic unit 22, the first connector 2, including the swingable levers 5 and the male connector housing 14, and the holder 1 may be mounted on the electronic unit 22, and the second connector 4, including the female connector housing 20, may be mounted on the mounting portion S. The holder 1 for supporting the first connector 2 may be molded integrally with a molded product such as an instrument panel or a trim cover of the automobile. Instead of the above structure in which the engagement pins 9, formed respectively on the swingable levers 5, are introduced into and engaged in the respective guide grooves 10 formed in the holder 1, there may be provided a structure in which the engagement pins 9 are formed on the holder 1, and the guide grooves 10, in which the engagement pins 9 are engageable, respectively, are formed in the swingable levers 5, respectively. The swingable levers 5 may be swingably supported on the holder 1, and the drive groove portions 10b, forming the drive portions for swingingly displacing the swingable levers 5, or the engagement pins 9 may be provided at the connector housing 14 of the first connector 2. Instead of the swingable levers 5, there may be used operating members (as disclosed in Japanese Patent Unexamined Publication No. 4-319271) having a cam groove, by which the two connectors 2 and 4 are connected together. As describe above, in the present invention, the draw drive mechanisms for drawing the first connector to the connection stand-by position when releasing the connection between the first and second connectors is provided between the first and second connectors, and the second connector is provided with the retaining portions which maintain the draw-driven condition of the first connector, achieved by the draw drive mechanisms, before the first connector is drawn to the connection stand-by position by the draw drive mechanisms, and also allow the draw-driven condition of the first connector to be released when the first connector is drawn to the connection stand-by position. Therefore, even if an external force, limiting the movement of the first connector, is applied during the time when the first connector is drawn toward the front side of the holder, and is moved to the connection stand-by position by the draw drive mechanisms, the retaining portions prevent the disengagement of the second connector before the first connector is returned to the connection stand-by position, and when releasing the connection between the two connectors, the first connector can be positively moved to the connection stand-by position by the draw drive mechanisms. In the connector connection structure of the invention, there are provided the provisional retainment release mechanisms which when connecting the first and second connectors together, drive the provisionally-retaining mechanisms so as to forcibly release the provisionally-retained condition of the first connector. Therefore, before the two connectors are connected together, the first connector can be stably held in the connection stand-by position, and also when connecting the two connectors together, the provisionally-retained condition of the first connector, achieved by the provisionally-retaining mechanisms, can be easily and positively released, so that the first connector can be shifted into the connected condition.

Claims: A connector connection structure comprising: a first connector (2) inserted in and supported on a holder (1); a second connector (4) for connection to said first connector (2); a provisionally-retaining mechanism (41) provided between said first connector (2) and said holder (1) for provisionally retaining said first connector (2) in a connection stand-by position so as to prevent the first connector (2) from being forced into the holder; when connecting said first and second connectors together, the provisionally-retained condition of said first connector (2) is released by a provisional retainment release mechanism (18b, 43), so that said first connector (2) can be slidingly shifted into a connection position; characterised by a draw drive mechanism (42) formed by engaging arms on said first and second connectors engaging with each other in a draw-driven condition, and provided between said first and second connectors for drawing said first connector (2) to said connection stand-by position when releasing the connection between said first and second connectors by pulling the second connector (4) to a connection releasing direction; and a retaining portion (43) provided in said second connector (4), which maintains a draw-driven condition of said first connector (2), achieved by said draw drive mechanism (42), before said first connector (2) is drawn to said connection stand-by position by said draw drive mechanism (42), and also allows the draw-driven condition of said first connector (2) to be released when said first connector (2) is drawn to said connection stand-by position. A connector connection structure according to claim 1, wherein said provisional retainment release mechanism (18b, 43), when connecting said first and second connectors together, moves said provisionally-retaining mechanism (41) so as to forcibly release the provisionally-retained condition of said first connector (2). A connector connection structure according to claim 1, wherein said provisionally-retaining mechanism (41) comprises a provisionally-retaining arm (18) projecting forwardly from a rear end portion of a side wall of said holder (1), and a step portion (19) formed on an inner surface of a side wall of a connector housing (14) of said first connector (2). A connector connection structure according to claim 3, wherein said provisionally-retaining arm (18) has a pair of upper and lower projections (18a) formed at a distal end, which abut against a rear end surface of said step portion (19) to provisionally retain said first connector (2) in the connection stand-by position. A connector connection structure according to claim 4, wherein said step portion (19) has a inwardly slanting surface (19a), when releasing the connection, said inwardly slanting surface (19a) abuts against a rear end of said provisionally-retaining projection (18a) to swingingly displace said provisionally-retaining arm (18) inwardly. A connector connection structure according to claim 1, wherein said draw drive mechanism (42) has a first engagement arm (44) extending forwardly from a rear end portion of the first connector (2), a first engagement projection (44a) being formed at a distal end of the first engagement arm (44), and a second engagement arm (45) extending forwardly from a rear end portion of the second connector (4), a second engagement projection (45a) for engagement with said first engagement projection (44a) being formed at a distal end of the second engagement arm (45). A connector connection structure according to claim 2, wherein said provisionally-retaining mechanism (41) comprises a provisionally-retaining arm (18) projecting forwardly from a rear end portion of aside wall of said holder (1), and said retaining portion is formed on an inner surface of a side wall of a connector housing of the second connector (4), and when releasing the connection between the first and second connectors, swingingly displaces the distal end portion of the provisionally-retaining arm (18) inwardly.

Inventors: ONO JUNICHI, ONO, JUNICHI, ONO, JUNICHI, C/O HARNESS SYSTEM TECH. RES., LTD.
Applicants: AUTONETWORKS TECHNOLOGIES LTD, SUMITOMO ELECTRIC INDUSTRIES, SUMITOMO WIRING SYSTEMS, AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1997
Main classification: H01R13
IPC codes: H01R13