A connector engagement detecting apparatus

Abstract: A first connector housing is provided with a lock verification slider that can be advanced toward the first connector housing only when the two connector housings are completely connected. A pair of engagement detection terminals are provided to either the first connector housing or the lock verification slider, and a short-circuit terminal is provided to either the lock verification slider or the first connector housing so that it faces the pair of engagement detection terminals. The pair of engagement detection terminals and the short-circuit terminal make up a connector engagement detection circuit. When the two connector housings are connected completely and the lock verification slider is advanced, the pair of engagement detection terminals and the short-circuit terminal are brought into contact with each other, completing the connector engagement detection circuit to indicate the full engagement of the mating connector housings.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a connector engagement detecting apparatus which has a means to determine whether or not a pair of mating connectors used for connection of automotive wiring harnesses are normally joined together (US-A- 4 634 204). Prior Art In using an electrical connector which is composed of a pair of female and male connector housings, it is of the utmost importance that complete engagement of the pair is assured. Actually, however, incomplete engagement thereof takes place unnoticed so frequently that improper electrical connection results and the solution of this problem has been demanded. SUMMARY OF THE INVENTION The present invention has been accomplished to overcome the above drawback and its objective is to provide a connector engagement detecting apparatus which has a lock verification slider that electrically detects a complete engagement of mating connectors. To achieve the above objective, a connector engagement detecting apparatus of this invention comprises: a first connector housing with a resilient lock arm; a second connector housing with an engagement portion that cooperates with the resilient lock arm of the first connector housing, said first and second connector housings being adapted to be joined together; a lock verification slider mounted to the first connector housing, said lock verification slider being able to be advanced only when the two connector housings are completely connected; a pair of engagement detection terminals provided to either the first connector housing or the lock verification slider; and a short-circuit terminal provided to either the lock verification slider or the first connector housing so that it faces the engagement detection terminals and, when the lock verification slider advances, comes into contact with the engagement detection terminals. BRIEF DESCRIPTION OF THE DRAWINGS Figures 1a to 1f are cross-sectional views of a conventional apparatus, showing a series of engaged positions of the paired connector housings; Figure 2 is a perspective view of one embodiment of this invention showing one of mating connector housings partly cut away; Figure 3 is a rear view of a first connector housing of Figure 2; Figure 4 is a plan view of the first connector housing of Figure 2; Figure 5 is a perspective view of a second embodiment of the invention showing a lock verification slider separated from a first connector housing; Figures 6a and 6b are cross-sectional views of Figure 5, with Figure 6a showing the lock verification slider in a retracted position and Figure 6b showing it in an advanced position; Figures 7a and 7b are bottom views of Figure 5, with Figure 7a showing the lock verification slider in the retracted position and Figure 7b showing it in the advanced position; Figure 8 is a rear view of a third embodiment of the invention; Figures 9a and 9b are cross-sectional views of Figure 8, with Figure 9a showing the lock verification slider in the retracted position and Figure 9b showing it in the advanced position; Figure 10 is a rear view of a fourth embodiment of the invention; and Figures 11a and 11b are cross-sectional views of Figure 10, with Figure 11a showing the lock verification slider in the retracted position and Figure 11b showing it in the advanced position. PREFERRED EMBODIMENTS OF THE INVENTION Referring to Figure 1, reference symbol A ′ represents a male connector which consists of a male connector housing A that holds a female terminal C in a terminal accommodating chamber by a resilient engagement piece 2 . Denoted B ′ is a female connector which consists of a female connector housing B that holds a male terminal D in a terminal accommodating chamber 3 by a resilient engagement piece 4 . The male connector housing A has a lock arm 5 formed on a resilient support 5a which has a slot 5b at the front half thereof and an engagement portion 5c formed at the front end of the slot 5b . The engagement portion 5c is adapted to engage with an engagement projection 6 formed on the surface of the female connector housing B . The lock arm is provided at the rear end with an unlock portion 5d . The male connector housing A has a lock verification slider E , which is longitudinally movable. From a base portion 7 of the lock verification slider E projects a resilient lock detection arm 8 which has an abutment portion 8a and a support portion 8b at the front. The lock detection arm 8 extends into the slot 5b of the lock arm 5 with the abutment portion 8a abutting against the rear surface of the engagement portion 5c and with the support portion 8b contacting the upper surface of the engagement portion 5c . Before the male and female connector housings A , B are joined, as shown in Figure 1a, the lock verification slider E is blocked by the engagement portion 5c of the lock arm 5 from moving forwardly. As the male and female connector housings A , B are engaged, the engagement portion 5c of the lock arm 5 moves up a tapered guide surface 6a of the engagement projection 6 and at the same time the lock detection arm 8 also moves upward (Figures 1b and 1c). When the engagement portion 5c rides over the engagement projection 6 , the lock arm 5 lowers and the abutment portion 8a rests on top of the engagement projection 6 . As a result, the lock detection arm 8 is cleared of the restriction from the lock arm 5 and remains inclined upwardly (Figure 1d). In this condition, the lock verification slider E can be moved forwardly, which is a proof that the male and female connectors A ′, B ′ are completely engaged. The description in the foregoing explains the common structure of the male connector housing, the female connector housing and the lock verification slider, which are further detailed in the following embodiments. A male connector housing A₁ shown in Figures 2 through 4 has a lock verification slider E₁ , which can be advanced forwardly when the male connector housing A₁ is completely connected with a mating female connector housing (not shown). The lock verification slider E₁ and the lock arm 5 are engaged through a guide rail structure. The male connector housing A₁ has at the front half thereof an enclosure portion 9 that encloses the mating female connector housing. A pair of rails 10 extend rearwardly from the rear end of the enclosure portion 9 . Grooves 11 formed in the lock verification slider E₁ on either side of the base portion 7 engage with the rails 10 . Also formed in the lock verification slider E₁ above the grooves 11 are a pair of terminal accommodating chambers 12 that extend longitudinally therethrough. A small female terminal F₁ for detecting connector engagement that is already attached with a wire 13 is inserted into each of the terminal accommodating chambers 12 , with an engagement piece 14 engaged with a step portion 12a to prevent the female terminal from slipping off. A short-circuit terminal G₁ , roughly U-shaped when viewed from above, is embedded in the enclosure portion 9 and has its contact ends G₁ ′ projected from the rear end of the enclosure portion 9 to face the engagement detection female terminals F₁ . In the above construction, when the two connector housings are completely connected, the lock verification slider E₁ can be advanced, at which time the contact ends G₁ ′ of the short-circuit terminal G₁ come into contact with the paired engagement detection female terminals F₁ to complete the connector engagement detection circuit. In another embodiment shown in Figures 5 to 7, a pair of terminal accommodating chambers 15 are formed in the lower part of the enclosure portion 9 ′ of the male connector housing A₂ . Inserted and fixed in the terminal accommodating chambers 15 are terminals F₂ for connector engagement detection circuit which have elastic contact pieces 16 projecting downwardly through an opening in the enclosure portion 9 ′. A lock verification slider E₂ is provided, through an annular frame portion 17a , with a support plate 17 which has an L-shaped short-circuit terminal G₂ . In the above construction, when the male connector housing is not engaged with the mating connector housing, a part of the L-shaped short-circuit terminal G₂ is in contact with one of the engagement detection terminals F₂ (Figure 7a). With the mating connector housings fully engaged, the lock verification slider F₂ is pushed toward the male connector housing A₂ , bringing the short-circuit terminal G₂ into contact with both of the engagement detection terminals F₂ to complete the connector engagement detection circuit. In still another embodiment of Figures 8 and 9, a pair of terminal accommodating chambers 18 are formed in the lock verification slider E₃ . Inserted and fixed in the terminal accommodating chambers 18 are engagement detection terminals F₃ whose elastic contact pieces 19 project through openings in the slider E₃ . A short-circuit terminal G₃ is embedded in an enclosure portion 9 ″ of the male connector housing A₃ , with a contact end G₃ ′ projecting toward elastic contact pieces 19 . In the above construction, with the male connector housing completely engaged with the mating connector housing, as the lock verification slider E₃ is advanced, the contact end G₃ ′ of the short-circuit terminal G₃ comes into contact with the elastic contact pieces 19 of the engagement detection terminals F₃ , completing the connector engagement detection circuit. In a further embodiment shown in Figures 10 and 11, a pair of terminal accommodating chambers 20 are formed in the rear part of an enclosure portion 9 ‴ of the male connector housing A₄ . Engagement detection terminals F₄ are inserted and fixed in the terminal accommodating chambers 20 . A short-circuit terminal G₄ is provided to a lock verification slider E₄ . With the two mating connector housings completely engaged, when the slider E₄ is pushed in, elastic contact ends G₄ ′ of the short-circuit terminal G₄ project down through openings 20a and engage with the engagement detection terminals F₄ , completing the connector engagement detection circuit. The construction and advantages of this invention may be summarized as follows. One of the mating connector housings has a resilient lock arm and the other connector housing has an engagement portion that cooperates with the resilient lock arm. The first connector housing is also provided with a lock verification slider that can be advanced only when the two connector housings are completely connected. A pair of engagement detection terminals are provided to either the first connector housing or the lock verification slider, and a short-circuit terminal is provided to either the lock verification slider or the first connector housing so that the engagement detection terminals and the short-circuit terminal face each other and, when the lock verification slider is advanced, come into contact with each other. This construction that utilizes the lock verification slider realizes the connector engagement detection circuit without enlarging the connector housing.

Claims: A connector engagement detecting apparatus comprising: a first connector housing (A₁, A₂, A₃, A₄) with a resilient lock arm (5); a second connector housing (B) with an engagement portion (6) that cooperates with the resilient lock arm (5) of the first connector housing (A₁, A₂, A₃, A₄), said first and second connector housings (A₁, A₂, A₃, A₄; B) being adapted to be joined together; a lock verification slider (E₁, E₂, E₃, E₄) mounted to the first connector housing (A₁, A₂, A₃, A₄), said lock verification slider (E₁, E₂, E₃, E₄) being able to be advanced only when the two connector housings (A₁, A₂, A₃, A₄; B) are completely connected; characterized in that a pair of engagement detection terminals (F₁, F₂, F₃, F₄) is provided to either one of the first connector housing (A₁, A₂, A₃, A₄) and the lock verification slider (E₁, E₂, E₃, E₄); and a short-circuit terminal (G₁, G₂, G₃, G₄) is provided to the other one of the lock verification slider (E₁, E₂, E₃, E₄) and the first connector housing (A₁, A₂, A₃, A₄), so that it faces the engagement detection terminals (F₁, F₂, F₃, F₄) and, when the lock verification slider (E₁, E₂, E₃, E₄) advances, comes into contact with the engagement detection terminals (F₁, F₂, F₃, F₄). A connector engagement detecting apparatus as claimed in claim 1, wherein said short-circuit terminal (G₁, G₃) is provided to the first connector housing (A₁, A₃) and said engagement detection terminals (F₁, F₃) are provided to the lock verification slider (E₁, E₃). A connector engagement detecting apparatus as claimed in claim 1, wherein said short-circuit terminal (G₂, G₄) is provided to the lock verification slider (E₂, E₄) and said engagement detection terminals (F₂, F₄) are provided to the first connector housing (A₂, A₄). A connector engagement detecting apparatus as claimed in claim 1, wherein said lock verification slider (E₁, E₂) is mounted to the first connector housing (A₁, A₂) through a rail structure (10, 11).

Inventors: KATO TETSUO, MURAKAMI YOSHIHIRO, KATO, TETSUO, MURAKAMI, YOSHIHIRO
Applicants: YAZAKI CORP, YAZAKI CORPORATION
Application year: 1991
Main classification: H01R13
IPC codes: H01R13