Testing unit for connector testing

Abstract: A testing unit is provided for mounting on a connector testing device for testing a connector (C) which includes a plurality of metal terminals (T) fastened to the connector by a lance system (C2). A probe pin (22) for testing conductivity is held by a molded resin slider (21) having a pair of electrodes (22). The slider is integrally formed with a probe pin which holds a protrusion for testing, whether the fastening of the lance is complete. Positioning a lance testing member or protrusion relative to the lance can be achieved without providing a rotation-free stopper of the probe pin. In addition, individual failure testing can be achieved compared with the case which holds all of the probe pins. Furthermore, damage to the lance resulting from the material selection can also be avoided. Furthermore, a better connection between a probe pin and a lead wire (25) is also provided when displacing probe pin of a connector testing device relative to the position of a lead wire. This is accomplished by providing a conductive member fixed to a block and connecting a lead wire with the fixed conductive member. Furthermore, the fixed conductive member and a probe pin are relatively and displaceably connected in an electrically conductive manner. The probe pin is retained in a relatively displaceable manner to the block by a slider. Thus, even when the probe pin is displaced relative to the block area during testing, a connecting position of the lead wire is not subjected to displacement from the predetermined position.

Description: The present invention relates to a testing unit for a connector testing device. In general, a connector used for an electric wiring system such as a wire harness or a sub-assembly (hereinafter totally referred to as a "wire assembly") for forming a wire harness includes a plurality of cavities in a molded resin housing, and metal terminals connected with wires are inserted therein. The metal terminals are fastened within a cavity by a lance system. With this lance system, by fastening a tongue-shape lance formed on either the metal terminal or the connector (mainly on the connector) to a fastening hole formed in the other, removal from the cavity of the metal terminal is prevented. In the above-mentioned wire assembly production process, conductivity testing of electric wiring condition and connecting condition, etc. of the above-mentioned connectors, as well as testing of the fastening condition of metal terminals and housing are each carried out. There have been proposed various testing areas on a connector testing device capable of carrying out simultaneously testing the conductivity and the fastening condition. The testing unit of a connector testing device normally includes a connector holder which holds a connector and a testing area capable of moving toward and away from a held connector. The testing area is provided on a block as the main body member, and probe pins are provided on the block and are inserted in a cavity of the connector which is equipped with metal terminals that are electrically connectable to the probe pins. Various improvements are made for the probe pin and block in order to test a fastening condition between the metal terminals and the connector housing. For example, with the prior art as disclosed in Japanese Unexamined Patent Publication No. HEI 7-113836, the above-mentioned block and probe pin are connected through a spring, structured to be elastically displaceable toward and away from the metal terminals, and provided on the tip of a probe pin with a testing area for incomplete insertion which allows contact with a lance which is incompletely fastened within the cavity. With this prior art, in the event of normal connection of the lance, contact between the probe pin and the metal terminals electrically causes a circuit in the testing unit to close, thus allowing conductive testing. While in case of incomplete fastening of the lance, contact of a partially inserted testing unit with the lance causes the spring to compress, which does not allow the probe pin to reach the metal terminals, thereby resulting in a failure of the conductive test where the fastening condition of the lance is incomplete. With the prior art as set forth in Japanese Unexamined Patent Publication No. HEI 8-320355, by providing a molded resin slider integrally with a probe pin, and configuring the probe pin to be movable elastically toward and away from the metal terminal, with this slider integrally formed with lance test pins which are similar to those of the above-mentioned incomplete insertion checking unit, incomplete lance fastening was made testable. However, with the above-mentioned slider, all the pins corresponding to the number of poles of metal terminals were integrally held in position. In the case of the former structure of probe pins, while testing the lance by each metal terminal can be made, damage to the lance may be possible when an incomplete insertion testing area engages a lance which is not completely fastened due to the incomplete insertion testing area being integrally formed with the probe pin. In order that the incomplete insertion testing area can be maintained in a normal position that enables testing of the lance, providing a mechanism for preventing the probe pin from rotation was necessary, which inevitably increased the number of components and also made the structure complicated. On the other hand, in adopting the latter structure, because all of the lance test pins are integrally formed with the same slider, testing the lance by each metal terminal was difficult. In addition, because all of the lance test pins are integrally formed with the same slider, the load of the spring which biases the slider becomes higher, thereby possibly causing damage to the lance due to greater load applied to the lance when the lance subjected to incomplete fastening engages the lance test pins. Furthermore, with such a conductive testing device, in order to provide a switching function for testing the condition of a connector (mainly for conditions of the metal terminal or a lance which fastens the metal terminal), there are devices in which the above-mentioned probe pins are mounted on a slider which is displaceable relative to a block area along a direction opposite to a connector holder, with a predetermined force biased in a direction of the connector holder. With this kind of testing device, in making the probe pins contact the terminal pins by moving the block close to the connector holder, the devices are formed in such a manner that the condition of a connector was determined by whether the slider displaces or not. With the testing device as mounted on a testing unit with a probe pin through a slider which displaces relative to a block area as mentioned above, a lead wire connected with the probe pin also moves in accordance with the displacement of the slider relative to the block area. Therefore, during continued use of the device, the connected area between the lead wire and probe pin is subjected to wear, thereby causing a deficiency that is likely to break the wires. European Patent Application No. 0 790 504 A1 discloses a device for testing a connector which has a plurality of terminals. The testing device has a plurality of pin units each comprising a pair of probe pins with an associated pair of lance testing members. The pin units are fixed in a probe holder mounted in a probe support and biased by springs to a forward test position. In use, if any of the terminals of a connector being tested is incorrectly fastened, the corresponding lance testing member is prevented from entering the flexing space. As a result, the probe holder together with all the pairs of probe pins is displaced against the biasing of the springs away from the connector. In this condition, all of the probe pins are spaced from the corresponding terminals of both correctly and incorrectly fastened terminals. Thus, the present invention was made to overcome the above-mentioned deficiencies, and therefore an object of the present invention is to provide a testing unit of a connector testing device which can carry out comparatively individual testing of lances and which also avoids damage to the lances which are incompletely fastened. An additional object of an embodiment of the present invention, in order to overcome the above-mentioned deficiencies, is to provide a testing unit of a connector testing device capable of properly maintaining a connected condition between a probe pin and a lead wire. In order to solve the above-mentioned problems, the testing unit of the present invention comprises, a block, a plurality of pin units received in the block, each pin unit having a slider provided with a pair of probe pins for testing electrical conductivity of metal terminals of an electrical connector mounted on the device, and a pair of lance testing members for testing incomplete fastening of lances fastening the metal terminals corresponding to the pair of probe pins, characterised in that the slider of each pin unit is independently displaceable relative to the block during testing if either of the lances fastening the metal terminals corresponding to the pair of probe pins of the pin unit is incorrectly fastened. With the invention including these specific items, because a slider holds the probe pins in pairs for two holes, positioning of a lance testing member on the lance without providing a rotation stop for the probe pin is possible. Furthermore, because the slider structure holds probe pins in pairs for two holes, far more individual failure testing is possible when compared with the case of all the probe pins being held. In addition, since the lance testing member is integrally formed with a different member from the probe pins, the material of lance testing member can be freely chosen, thus making it possible to avoid damage to the lance resulting from the particular materials. The above-mentioned slider and lance testing members of each pin unit may be formed as an integrally molded resin article. Furthermore, because the slider and lance testing members are made of molded resin, the material can avoid damage to the lance and can decrease production costs. Additionally, the pin unit may be biased towards the connector. The pin unit may be biased by a pair of spring loaded members engaging the slider, preferably on opposite ends of the slider. Alternatively, the pin unit is biased by a compression spring engaging the block and the slider, preferably around each pin unit. In yet another arrangement the pin unit is biased by a pair of spring loaded members wherein the spring loaded members are in contact with the probe pins. In this case, the above-mentioned biasing member performs as a buffer member which buffers impulse generated when the probe pin bumps against the metal terminals. The probe pins may be electrically connected to a lead wire through the pair of spring loaded members in contact with the probe pins. In an additional embodiment, the slider has an insertion hole having a step which is engaged by the probe pin in a direction towards the connector and the probe pin is displaceable relative to the slider away from the connector. Additionally, the probe pins may have a contact area which protrudes from the slider towards the connector, a larger diameter area formed larger in diameter than the diameter of the contact area and a connecting area connected to the connecting pin, the insertion hole of the slider has a small diameter area which slidably receives the contact area of the probe pin, the step and a large diameter area which slidably receives the larger diameter area of the probe pin, wherein displacement of the probe pin towards the direction of the connector causes the large diameter area of the probe pin to engage the step of the slider and displacement of the probe pin away from the connector causes the large diameter area of the probe pin to slide in the large diameter area of the slider. With the invention containing these elements, even when a probe pin is displaced by having the slider displace relative to the block, the connecting position of the lead wires connected to the probe pins through the spring loaded members remains at a fixed predetermined position relative to the block. The slider and probe pin may be integrally fastened, or the probe pins may be independently displaceable from the slider in a direction away from the connector but are displaceable integral with the slider in a direction towards the connector. The above and other features and advantages of the present invention will be made apparent from the following description of the preferred embodiments, given as nonlimiting examples, with reference to the accompanying drawings, in which: Fig. 1 represents an exploded perspective view of the testing unit of a first embodiment of the present invention; Fig. 2 represents a sectional view showing the function of a testing unit of the embodiment shown in Fig. 1; Fig. 3 represents a sectional view showing the function of a testing unit of the embodiment shown in Fig. 1; Fig. 4 represents a sectional view showing a second embodiment of the present invention; Fig. 5 represents a sectional view showing another view of the second embodiment of the present invention; Fig. 6 represents an exploded perspective view of a testing unit in a third embodiment of the present invention; Fig. 7 represents a sectional view showing a function of a testing unit in the embodiment in Fig. 6; Fig. 8 represents a sectional view showing a function of a testing unit in the embodiment in Fig. 6; Fig. 9 represents a partially broken-away perspective view showing an essential area of a testing unit in a fourth embodiment of the invention which is a modification of the embodiment shown in Fig. 6; Fig. 10 represents a sectional view showing a function of a testing unit of the embodiment in Fig. 9; and Fig. 11 represents a sectional view showing a function of a testing unit of the embodiment in Fig. 9. With reference to the attached drawings, a detailed description follows of the preferred embodiments of the present invention. Fig. 1 represents an exploded perspective view of a testing unit 10 in a first embodiment of the present invention, and Figs. 2 and 3 represent sectional views showing the operation of the testing unit of the embodiment shown in Fig. 1. With reference to these drawings, the embodiment shown comprises a block 11 which extends vertically. The block 11 is made of molded resin formed in a "T" shape as seen in plan, with the front end face 12 (a face as shown in Fig. 1) provided with a recessed rectangular housing 13, and with the rear end face provided with a step 14. The step 14 may be mounted in a lever mechanism of connector testing device (which is not illustrated), which device also includes a structure permitting relative displacement between a testing position which allows the connector C (in Figs. 2 and 3) held in the connector testing device to be tested and a releasing position for releasing the connector C. In the recessed housing 13, a plurality of pin units 20 (only one unit is illustrated in the drawing) which represents the key concept of the present invention is incorporated, and is prevented from being withdrawn from the housing 13 by means of a rectangular frame cover member 15 fixed with small screws 16 onto the front end face 12. As shown clearly in Fig. 2, the pin unit 20 includes a slider 21 which is rectangular in shape and is displaceable in the fore and aft directions within the housing 13, a probe pin 22 which carries out conductive testing for metal terminals of a connector C, and a protrusion 23, which serves as a lance testing member, is provided on the slider 21. With the embodiments as shown in Figs. 1-5 of the drawings, a pair of advance/retreat rods 24 are mounted on opposite ends of the slider 21. The advance/retreat rod 24 is formed from an outer tubular cylinder 24A fastened to the block 11, an inner cylindrical shaft 24B which is displaceable relative to the outer tubular cylinder 24A, and a compression coil spring 24C which is provided within the inner area of the outer tubular cylinder 24A for biasing the inner cylindrical shaft 24B outwardly. With the aid of a pair of the advance/retreat rods 24, the slider 21 is normally elastically biased in a forward direction, i.e., in a direction toward the metal terminals T of the connector C. Although not illustrated in the drawings, a stop (for instance, an outer flange and inner flange), similar to a so-called well-known two probe pin structure, is formed on both members 24A and 24B so that the inner cylindrical shaft 24B will not separate from the outer tubular cylinder 24A. The above-mentioned slider 21 and the above-mentioned protrusion 23 are integrally formed of molded resin. The protrusion 23 is provided with an external shape and is dimensioned so that it can contact the lance C2 only when the lance C2 formed on a connector C is incompletely fastened by entering into the cavity C1 for the connector C. With use of this protrusion 23, a structure capable of testing the failure in fastening of lances is accomplished in the same manner as with the prior art. Also described here with respect to the first embodiment is a slider 21 configured to have a pair of poles formed as two adjacent probe pins 22 and 22, and a pair of protrusions 23 and 23 which correspond to the slider 21 are also integrally formed thereon. The operation of the first embodiment will now be described with reference to Figs. 2 and 3 of the drawings. In reference to Fig. 2, in the event that connector C as a testing subject is normal, a lance C2 is not disposed in the cavity since each lance C2 normally entered into the metal terminals T within the inner area of the connector C. In this situation when the connector C is tested in the testing unit 10 as in the illustrated embodiment, the slider 21 moves to a position connectable with the metal terminals T by the biasing force of compression coil spring 24 on the advance/retreat rod 24 because the protrusion 23 integrally formed with the slider 21 does not engage against the lance C2 and thus enters into the inner area of connector C. Therefore, as the metal terminals T and the probe pins 22 are electrically connected to each other, conductive testing becomes possible and the fastening condition of lance C2 can also be determined to be normal. On the other hand, as shown in Fig. 3, in the event that either one of the lances C2 is incompletely fastened, because the protrusion 23 comes into contact with the lance C2 which is incompletely fastened during the course of movement of the block 11 and connector C toward each other, the probe pins 22 do not contact the metal terminals T, and the slider 21 is relatively displaced from the block 11 when the block area 11 and the connector C are brought close to a normal testing position, which makes conductive checking impossible. Therefore, a person in charge of testing must test first for abnormality of the lance. Figs. 4 and 5 represent sectional views of a second embodiment of the present invention. With these embodiments, in place of the above-mentioned advance/retreat rod 24, a slider 21 is biased in a forward direction by arranging a compression coil spring 25 around the outer peripheral area of each probe pin 22. The coil spring 25 is positioned between the block 11 and the slider 21 as shown in Figs. 4 and 5. With this embodiment, the same function as above can be achieved. As explained above, with each of the embodiments described above, because the slider 21 holds the probe pins 22 in a pair of two probes, protrusions 23 can be positioned on the lance C2 without providing a rotation stop or the like for the probe pins 22. In addition, because of the use of a pair of probes on each slider, remarkably individual failure testing is possible when compared with the case of all the probe pins 22 being held. Furthermore, as the protrusion 23 is integrally formed with a slider 21 which is a different member from the probe pins 22, the material (resin in the illustrated embodiment) of protrusion 23 can be selected to avoid damage to the lance C2. In addition, because the slider 21 and protrusion 23 are formed of molded resin, damage to lance C2 can be avoided and production costs can also be decreased. Therefore, the above-described embodiment provides superior results compared to individual testing of lance C2, and damage to lance C2 as a result of incomplete fastening can be avoided. With reference to Figs. 6-11 of the drawings, further embodiments are shown in which like elements have been designated with the same reference numerals used above. The invention depicted in these figures includes a block 11 which extends vertically. The block 11 is made of molded resin formed in a T-shape as seen in plan, and includes a recessed rectangular housing area 13 on the front-end face 12 (shown in Fig. 6) as well as a step area 14 on the rear-end side provided. The step area 14 may be mounted in a lever mechanism of a connector testing device (which is not shown in the drawing) and which device is also provided with a mechanism which causes a connector C (in Figs. 7 and 8) to be held on the above-mentioned connector detecting device to displace relatively between a detectable testing position and a releasing position to release the connector C. In the recessed area of the housing 13, a plurality of pin units 120 (only one unit is shown in the drawing) is incorporated, which are prevented from being detached from the housing area 13 by rectangular-shaped cover member 15 to be fixed to the front-end face 12 by small screws 16. As clearly shown in Fig. 7, the pin unit 120 includes a slider 121 which is formed in a rectangular shape and held within the housing area 13. The slider 121 is displaceable in a fore and aft direction and includes probe pins 122 which carry out conductive testing of metal terminals T of connector C and protrusions 123 which serve as lance testing members. The slider 121 and the protrusions 123 are integrally formed of molded resin. Each protrusion 123 is configured so that when it enters a cavity C1 of connector C, only when a lance C2 formed on the connector C undergoes a fastening failure, the outer shape and dimension of the protrusion 123 allow contact with the lance C2. With the aid of this protrusion, the structure to test the fastening failure of a lance is made possible as is known. It should particularly be noted here with regard to this embodiment that each probe pin 122 of pin unit 120 is connected with a lead wire 25 through the connecting pin 30 which is fastened to the block area 11. With reference to Figs. 7 and 8, the connecting pin 30 functions both as a fixed-side conductive member and a connecting area. Connecting pin 30 includes a connecting contact 32 fastened to a tubular member 31 such that a portion protrudes on one end side of the tubular member 31. A slider 33 is slidably mounted within the tubular member 31, and a compression coil spring 34 is provided between the slider 33 and the connecting contact 32. The tubular member 31 is a metal member fastened to the back of the block 11 in a direction opposite to the connector C, the rear end of which is positioned flush with the rear end of step 14 of block 11. The connecting contact 32 is a metal member fixed to the back of tubular member 31 by spot welding, etc. A portion of connecting contact 32 protrudes rearwardly to form a connecting area for a lead wire 25'. By soldering a lead wire 25' to connecting contact 32, the connecting contact 32 is electrically connected with a probe pin 122 through tubular member 31 as will be disclosed below. The slider 33 is formed of a metallic cylindrical member and the tip-side (the side opposite to the connector) is chamfered to have a hemispherical form. The compression coil spring 34 provides a predetermined biasing force to the slider 33. Thus, compression coil spring 34 biases the slider 33 to maintain contact with a probe pin 122 as will be described later. With the embodiment as illustrated in Figs. 6-8 of the drawings, a reduced diameter area 31A is provided in the peripheral wall of tubular member 31 near the tip area thereof to retain the slider 33 within the tubular member 31. As shown in Fig. 7, by mounting the slider 121 to a block 11, the back end area of probe pin 122 contacts the slider 33, and the slider 121 is pressed against the side of cover member 15 in a free condition by the biasing force of the compression coil spring 34. The dimensions of slider 121, probe pin 30, etc. are determined so that the slider 121 can be displaced rearwardly against the biasing force of the compression coil spring 34. The operation of the above-described embodiment with regard to Figs. 7 and 8 will now be described. With reference to Fig. 7, when a connector C to be the subject of testing is normal, a lance C2 does not protrude into a cavity as a result of each lance C2 being inserted into a metal terminal T which is incorporated therein. Under this condition, when the connector C is tested with the testing unit 10 of the embodiment illustrated in the drawing, the slider 121 extends to a position to contact the metal terminal T by the biasing force of compression coil spring 34 of the connecting pin 30 because a protrusion 123 which is integrally formed with slider 121 enters into the inner area of the connector C without engaging the lance C2. With this arrangement, the metal terminal T and probe pin 122 are electrically connected. Furthermore, the fastened condition of the lance C2 is also determined to be normal because of the connection of metal terminal T with a lead wire 25' through the tubular member 31 from the slider 33, thereby making the conductivity testing possible. On the other hand, as shown in Fig. 8, when either one of lances C2 is incompletely fastened, because a protrusion 123 makes contact with the lance C2 which was incompletely fastened during the course of moving the block 11 and the connector C close to each other during movement to a normal testing position, the slider 121 is displaced relative to the block 11, thereby the probe pin 122 does not make contact with the metal terminal T. Consequently, carrying out the conductive is impossible. Therefore, the person conducting the testing must first test abnormality of the lance, thereby fastening failure of the lance is detected. In this case, with regard to the lead wire 25', the connecting position (connecting contact 32) of lead wire 25' remains fixed at a predetermined position, even when the slider 121 is displaced, by being connected with the tubular member 31. In this way, with the embodiment illustrated in the drawing, even when the probe pin 122 is displaced relative to the block 11, the above-mentioned connecting position is not subjected to the influence of displacement of the probe pin 122. As a result, the lead wire 25' is fixed at a predetermined position. In this way, it provides the superior result of maintaining a connected condition of the probe pin 122 and the lead wire 25'. The embodiment mentioned above is only representative of a preferred alternative of the present invention, and the present invention is not limited to the above-mentioned embodiment alone. For example, the probe pin 122 may be the one having a coil spring in itself apart from the compression coil spring 34 of connecting pin 30, or it may have the compression coil spring 34 connected with a buffer function when engaging against the metal terminals T. Additionally, a further embodiment of the invention is shown in Figs. 9-11. Fig. 9 depicts a partly diagrammatic perspective view showing an essential part testing unit with regard to a fourth embodiment of the present invention. Figs. 10 and 11 represent sectional views showing testing units of the embodiment as shown in Fig. 9. In this embodiment, the elements corresponding to the same elements in the third embodiment of Figs. 6-8 as described above-mentioned are provided with the same reference numerals, but with the explanation omitted, in the description which follows below. Referring to Figs. 9-11, with reference to the above embodiment as shown in these drawings, a probe pin 220 is similar to the second embodiment of the probe pin which is integrally held by a slider 121. This probe pin 220 concentrically and integrally includes a contact area 221 which protrudes from a slider 121 toward a connector C side, a larger diameter area 222 formed larger in diameter than the diameter of contact area 221, and a connecting area 223 formed smaller in diameter than that of the larger diameter area 222 and connected with a connecting pin 30. On the other hand, the slider 121 has an insertion hole 210 having concentric sections including a smaller diameter area 21A which slidably receives the contact area 221 toward the side of connector C, and includes a larger diameter area 21B which slidably receives the larger diameter area 222 toward the opposite side of connector C. This construction makes assembly possible by introducing a contact area 221 and larger diameter area 222 of probe pin 220 from the opening side of larger diameter area 21B of the insertion hole 210. Then, as shown in Figs. 10 and 11, by connecting the connecting area 223 and connecting pin 30, the compression coil spring 34 of the connecting pin 30 is also used as a buffer member when the probe pin 220 engages against the metal terminal T. When the probe pin 220 is held within the slider 121 in accordance with the above-mentioned structure, because an annular end face 21C provided by a step between the smaller diameter area 21A and the larger diameter area 21B of the slider 121 can engage the end of the larger diameter hole 21B adjacent the smaller diameter hole 21A, both are relatively and displaceably connected. Thus, both displace by being integrally connected when the probe pin 220 displaces to a connector C side or the slider 121 displaces to a connector C side or the slider 121 displaces to an opposite side of the connector C, while both can be relatively displaced in the opposite direction. With the embodiment as shown in Figs. 9-11, in the event that connector C to be tested is normal as shown in Fig. 10, the slider 121 extends to a position where probe pins 220 can contact with the metal terminals T by a biasing force of compression coil spring 34 of connecting pin 30 in the same manner as the third embodiment shown in Figs. 6-8. In this way, as a result of engagement between the metal terminal T and the probe pin 220, the probe pin 220 is electrically connected with the metal terminal T in an elastically displaced condition, to an extent in which its impulse can be buffered, yet it is connected with the lead wire 25' through the connecting pin 30 in the same manner as in the embodiment of Fig. 7. On the other hand, as shown in Fig. 11, when either one of lances C2 is improperly fastened, a lance contacts protrusion 23 and evidences the failure in fastening during the course of moving the block 11 and connector C toward each other. Thus, carrying out the conductive testing is not possible in the same manner as in the embodiment of Fig. 8, thereby the detection of the lance failure is possible. Furthermore, with the embodiment as shown in Figs. 9-11, the lead wire 25' remains fixed at a predetermined position. In addition, with the embodiment as shown in Figs. 9-11 of the drawings using the compression coil spring 34 as a buffer member when engaging against the metal terminal T, the number of components of probe pin 220 can be decreased, and the size can be set at a more compact range by making a shorter length in an axial direction. Furthermore, by decreasing the number of components, assembly becomes far easier with higher tolerance of processing accuracy. Additionally, in holding the probe pin 220 integrally with the slider, when the above-mentioned connecting structure is adopted, there is an advantage that torsion or the like is difficult to generate, because the probe pin 220 can escape individually from the metal terminal T even when the compression coil spring 34 is also used as a buffer member where a plurality of probe pins 220 are held by one slider 121, as shown in the drawing. In addition, with each of the above-mentioned embodiments, the structure to displace the probe pin 22 (220) relative to the block 11 through the slider 21 (121) may be suitable for the purpose of detecting the improper fastening of lances provided with protrusions for lance testing on the slider 21 (121) as mentioned above, and may also function to check the stop position of metal terminals as was previously proposed in the Patent Application No. HEI 4-338493 (Japanese Unexamined Patent Publication No. HEI 6-186272) by the inventor of the present invention. In providing a plurality of pin units 20 (220) with a plurality of sliders 21 (121), each slider may hold one pair of probe pins or may hold only one probe pin. According to the present invention as explained above, a lance testing member can be positioned on a lance without providing a rotation stop of a probe pin, far more individual failure testing can also be achieved when compared with the case of all the probe pins being held, and damage to a lance resulting from material can be avoided. Therefore, according to the present invention, superior results and individual lance testing are possible, and damage to a lance as a result of incomplete fastening can also be avoided. There may be various design alterations possible within the scope of patent claims of the present invention. As described above, even when relatively displacing a probe pin and a block, the above-mentioned connecting position is not subjected to the influence of displacement by the probe pin at all as a result of holding the connecting position of the lead wire at a predetermined position. In this way, the superior result of maintaining the connecting condition between the probe pin and the lead wire is achieved.

Claims: A testing unit (10) for a connector testing device, the testing unit (10) comprising, a block (11), a plurality of pin units (20,120) received in the block (11), each pin unit (20,120) having a slider (21,121) provided with a pair of probe pins (22,122,220) for testing electrical conductivity of metal terminals (T) of an electrical connector (C) mounted on the device, and a pair of lance testing member (23;123) for testing incomplete fastening of lances (C2) fastening the metal terminals (T) corresponding to the pair of probe pins (22,122,220), characterised in that the slider (21,121) of each pin unit 20,120) is independently displaceable relative to the block (11) during testing if either of the lances (C2) fastening the metal terminals (T) corresponding to the pair of probe pins (22,122,220) of the pin unit (20,120) is incorrectly fastened. A testing unit (10) for a connector testing device as set forth in claim 1, characterised in that the slider (21,121) and the lance testing members (23,123) of each pin unit (20,120) are formed as an integrally molded resin article. A testing unit (10) for a connector testing device as set forth in claim 1 or claim 2, characterised in that each pin unit (20,120) is biased towards the connector (C). A testing unit (10) for a connector testing device as set forth in claim 3, characterised in that each pin unit (20) is biased by a pair of spring loaded members (24) engaging the slider (21), preferably on opposite ends of the slider (21). A testing unit (10) for a connector testing device as set forth in claim 3, characterised in that each pin unit (20) is biased by a compression spring (25) engaging between the block (11) and the slider (121), preferably around each probe pin (22). A testing unit (10) for a connector testing device as set forth in claim 3, characterised in that each pin unit (120) is biased towards the connector (C) by a pair of spring loaded members (30), wherein the spring loaded members (30) are in contact with the probe pins (122,220). A testing unit (10) for a connector testing device as set forth in claim 6, characterised in that the probe pins (122,220) are electrically connected to lead wires (25') through the pair of spring loaded members (30). A testing unit (10) for a connector testing device as set forth in claim 6 or claim 7, characterised in that the probe pins (220) are independently displaceable relative to the slider (121) in a direction away from the connector (C) but are displaceable with the slider (121) in a direction towards the connector (C). A testing unit (10) for a connector testing device as set forth in claim 8, characterised in that the slider (121) has an insertion hole (210) with a step (21C) for slidably receiving each probe pin (220) whereby the probe pin (220) engages the step (21C) for displacement of the slider (121) with the probe pin (220) in a direction towards the connector (C) and the probe pin (220) is displaceable relative to the slider (121) away from the connector (C). A testing unit (10) for a connector testing device as set forth in claim 9, characterised in that each insertion hole (210) has a small diameter area (21A) and a large diameter area (21A) connected by the step (21C), and the probe pin (220) has a contact area (221) received in the small diameter area (21A) and protruding from the slider (121) towards the connector (C), and an area (222) of larger diameter than the contact area (221) received in the larger diameter area (21B), wherein the area (222) is engageable with the step (21C) for movement of the slider (121) with the probe pin (220) towards the connector (C), and the area (222) is slidable in the larger diameter area (21B) for movement of the probe pin (220) away from the connector (C) independently of the slider (121). A testing unit (10) for a connector testing device as set forth in any one of claims 7 to 10, characterised in that a connecting position of the lead wires (25') connecting the probe pins (122,220) through the spring loaded members (30) remains at a fixed predetermined position relative to the block (11).

Inventors: CHIYODA KENJI, CHIYODA, KENJI
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1998
Main classification: G01R31
IPC codes: G01R31