Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Patent
1992-06-09
1993-12-28
Abrams, Neil
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
439680, H01R 1364
Patent
active
052734633
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a test connector to be applied to an electronic apparatus having a plural number of electronic circuit units mounted on a shelf, for the purpose of positioning electronic circuit units outside the shelf while electrically connecting them to the main frame of the electronic apparatus.
BACKGROUND ART
In electronic apparatus such as electronic computers, electronic exchangers and the like, the following construction is widely adopted from the standpoint of maintenance or installation of optional circuits. Namely, an electronic apparatus is constituted by a plural number of electronic circuit units, each having a plural number of electronic devices like IC's and LSI's collectively mounted on a printed wiring board. Each of the electronic circuit units is mounted on a shelf with a backboard by the use of a plug-in type connector to facilitate replacement of the electronic circuit units or installation of additional or optional circuit units.
In an electronic apparatus constructed in the above-described manner, the respective electronic circuit units have to be inserted into correct positions on a shelf according to unit types because a misplaced unit is likely to cause troubles. Therefore, it is the general practice to provide an anti-misplacement mechanism which mechanically prevents an electronic circuit unit from being mounted in a false position.
For example, Japanese Laid-Open Patent Application 1-198098 discloses an anti-misplacement mechanism of this sort, as explained below with reference to FIG. 1.
In this figure, the reference numeral 11 denotes a shelf which is fixedly supported on a pair of posts 13. Fixed to the back side of the shelf 11 is a backboard 17 which is provided with a plural number of connectors 15 on the inner side thereof, along with a plural number of paired upper and lower guide grooves 19 on the ceiling and bottom sides of the shelf 11 to guide electronic circuit units therealong. A frame member 21 with an opening is provided on the front side of the shelf 11. The frame member 21 is provided with unit insertion grooves 23 in frame portions on the upper and lower sides of the opening correspondingly and contiguously to the guide grooves 19. Further, anti-misplacement grooves 25 are provided on the frame portion on the upper side of the opening correspondingly to the respective unit insertion grooves 23.
The reference 27 denotes an electronic circuit unit which has a plural number of electronic devices such as IC's, LSI's and the like collectively mounted on a printed wiring board. The electronic circuit unit 27 is provided with a connector 29 at one end thereof for coupling engagement with a connector 15 on the backboard 17, and with a surface plate 31 at the other end. The surface plate 31 is formed with an upwardly protruding anti-misplacement projection 33.
The electronic circuit unit 27 is inserted along the unit insertion groove 23 and guide groove 19 of a unit mounting position on the shelf until the connector 29 on the electronic circuit unit 27 is coupled with a corresponding connector 15 on the backboard 17.
The anti-misplacement grooves 25 formed in the frame member 21 of the shelf 11 and the anti-misplacement projection 33 formed on the surface plate 31 of the electronic circuit unit 27 function as follows. In this connection, it is the general practice to mount a plural number of electronic circuit units of different kinds or types on the shelf 11. Accordingly, there are possibilities of the electronic circuit units being mounted in positions other than actually intended positions. If the electronic apparatus is started in such a state, it becomes difficult to produce the intended functions of the apparatus, in addition to probabilities of troubles. The misplacement of this sort is prevented by the anti-misplacement grooves 25 on the frame member 21 in cooperation with the anti-misplacement projections 33 on the surface plates 31.
Namely, in a case where two kinds of electronic circuit units A and B are to be mounted on a she
REFERENCES:
patent: 2968019 (1961-01-01), Steinman et al.
patent: 3364458 (1968-01-01), Black, Jr. et al.
IBM Technical Disclosure, Benjamin et al. vol. 2, No. 1, p. 44, Jun. 1959.
Hongoh Tomoyuki
Kaetsu Mitsuo
Minematsu Kiyoshi
Yamaji Hiroshi
Abrams Neil
Fujitsu Limited
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