US1565578A

US1565578A - Testing fixture

Info

Publication number: US1565578A
Application number: US551293A
Authority: US
Inventors: Mcdonough John
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1922-04-10
Filing date: 1922-04-10
Publication date: 1925-12-15
Anticipated expiration: 1942-12-15

Description

Patented Dec. 15, 1925.

UNITED STATES I 1,565,578 PATENT OFFICE.

JOHN MODONOUGH, OF CHICAGO, ILLINOIS, AB SIGNOR TO WESTERN ELECTRIC COH- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 0! NEW YORK.

TESTING FIXTURE.

Application filed A ril it, 1922. Serial no. 551,293.

To all whom it may concern:

Be it known that I, JOHN MCDONOUGH,

a citizen of the United States, residing at Chicago, in the county of Cook and State 6 of Ilhnois, have invented certam new and useful Improvements in Testing Fixtures,

of which the following is a full, clear, concise, and exact description.

This invention relates to testing fixtures, 1 and more particularly to a fixture for checking electrical connections between terminals in one bank assembly and the corresponding multiple terminals in another bank assembly in frames of mechanical telephone switching systems.-

The object of this invention is to provide a simple and compact fixture by which the connections between the terminals may be expeditiously and accurately checked for errors.

In the preferred form of this invention a support is provided which is adapted to be positioned over a plurality of termmals.

Guided upon the support in alinement with the terminals is a circuit closing member provided with a signal lamp connected to one side of a battery. The other side of the battery is connected with the corresponding terminal in the other bank, and if 3 the connection between the corresponding terminals is correct it will be indicated by the lamp lighting.

In the drawings:

Figure 1 is a partial front elevation of a testing fixture embodying the features of this invention;

Fig. 2 is an enlarged bottom plan view thereof;

Fig. 3 is a cross section line 3-3 of Fig. 2, and

Fig. 4 is a schematic diagram of the testing fixture positioned upon a bank to check the connections between the terminals thereof and the corresponding terminals in an adjacent bank.

Referring to the drawings, 10 is a guide and supporting plate preferably made from insulating material such as fiber. In the embodiment of the invention as illustrated the guide and supporting plate 10 is adapted to be mounted on the vertical face of-a terminal bank assembly 11 of a mechanical telephone switching machine. In the particular type of terminal bank illustrated, the terminals 12 are staggered in a horizontal taken upon the bridge plate 18 direction across the bank and are in alinement with each other in a vertical direction. The supporting plate 10 comprises three slotted

strips

13, 13 suitably secured together by rivets 14. In the assembly of the slotted strips 13 to form the guide and supporting plate 10 the slots in the strips are staggered in a horizontal direction to conform with the staggered terminals 12. The support 10 is suspended directly upon the terminals 12 shown in dotted outline in Fig. 1 in a vertical direction and mounted thereon and adapted to be moved vertically is a signal carrying member 17 comprising a with turned-over ends 19 the member 17 upon the support 10 1n an position to which it is moved thereon. arried upon the plate 18 and insulated therefrom by a strip 20 are three

contact members

21, 21. The members 21 each comprises a pair of spring fingers 24 sultably shaped and positioned upon the plate 18 to engage one of the terminals 12 upon opposite sides when the member 17 is moved upon the support 10. Secured to the plate 18 with the contact members 21 and the strip 20 by

screws

26, 26 is a fiber block 27 provided with three

openings

28, 28 for mounting three signal lamps indibated at 31, 31.

The lamp terminals contact on one side adapted to hold

members

21, 21 and on the other side with

terminal plates

33, 33 secured to the'fiber block 27 by

screws

28,28.

In mechanical telephone switching systems the line terminals are arranged upon the bank in sets, each set comprising three terminals, the tip, sleeve and ring, and each in turn is permanently wired to a corresponding tip, sleeve or ring terminal in an adjacent bank. In a system built up of three or more banks the terminals of the second bank will be wired to the corresponding terminals in the third bank and the third bank to the fourth and so on. The

terminals are arranged so compactly upon the bank that mistakes are likely to occur in making connections between corresponding terminals in the two banks. 7

In using the testing fixture it is suspended vertically as described before at the top of with extending

portions

32, 32 of the contact.

the bank 11 and the signal carrying member 17 is moved by an operator upon the support 10 to bring the

contact members

21, 21 into engagement with the top set of terminals 12. The

terminal plates

33, 33 of the fixture are each wired to one side of a battery 36 (see Fig. 4). The other side of the battery 36 is connected with a hand contact member 1ndicated at 37 in Fig. 4. The hand contact member 37 is brought into engagement with the corresponding set of terminals 12 in the adjacent bank by a second operator, first the

contact members

21, 21 into engagement with the next set of terminals, which are tested in the same manner as the first set, the other operator merely contacting the member 37 with the second set of terminals in the adjacent bank. The terminal sets are suitably numbered beginning at the top of' the bank to indicate to the operators what set of terminals they are working on; also the slotted support 10 is provided with indicating marks 39 at certain intervals and at points in line with the slots therein so that the signal carrying member 17 ma y be readily and accurately positioned at the correct set of terminals.

The support 10 may be of any suitable length, either the length of the bank so as to span a complete vertical row of terminals, or it may be of such a length as to span only a portion of the terminals and after testing them, may be moved down to test the balance.

What is claimed is:

1. A testing fixture for testing electrical connections between terminals, comprising means for contacting in succession with the terminals at one end of the connections and along a fixed path, means held by the terminals adapted to guide said contacting means alonga fixed path, electric signal means associated with said contacting means, and means for connecting said signal means with the opposite terminals in successlon as said contacting means is moved whereby said signal means will be operated when the connections between the terminals are correct.

2.- A testing fixture for testing electrical connections between terminals, comprising a self contained device associable with and removable from as a unit the terminals at one end of the connections, a member movable thereon to successively engage the terminals, and signalling means, said signalling means associated with said last mentioned member and the opposite terminals and-adapted to indicate when the connec tions between the terminals are correct.

3. A testing fixture for testing electrical connections between terminals, comprising a member adapted to be detachably. held by the terminals at one end of the connections, a contact member movable thereon to successively engage the terminals, and means asso- -ciated with said contact member and the opposite terminals adapted to indicate when the connections between the terminals are correct.

4. A testing fixture for testing electrical connections between terminals, comprising an apertured member adapted to be mounted upon and to receive the terminals at one end of the connections, a contact member movably secured thereto and adapted to engage the terminals within the apertures in said member in succession as it is moved thereon, and means associated with said contact member andthe opposite terminals adapted to indicate when the connections between the terminals are correct.

5. A testing fixture for testing electrical connections between terminals, comprising a slotted plate adapted to receive a row of terminals at one end of the connections, a contact carriage movably secured to said slotted plate and adapted to engage the terminals passing through the slots in said plate in succession as it is moved thereon, electric signal means associated with said contact carriage, and means for connecting said signal means with the opposite terminals in succession as said contact carriage is moved whereby said signal means will be operated when the connections between the terminals are correct.

6. A testing fixture for testing electrical connections between terminals, comprising a supporting or guiding portion adapted to be associated with a plurality of terminals at one end of the connections, a carriage adapted to be moved upon said guiding portion,

contacts carried on said carriage adapted to engage the terminals associated with said carriage in succession as said carriage is moved, electric signal means mounted upon said carriage and in electrical contact with the contacts thereon, and means for connecting said signal means with the opposite terminals in succession as said carriage is moved whereby said signal means will be operated when the connections between the terminals are correct.

7. A testing fixture for testing electrical connections between terminals, comprising a slotted support or guide adapted to receive a plurality of terminals at one end of the connections, a carriage adapted to be moved upon said guide, spring contacts carried on said carriage adapted to contact with the terminals passing through the slots in said means said signal means will be operated when the connections between the terminals are correct.

8. A testing fixture for testing electrical connections between terminals, comprising a slotted support or guide adapted to receive a row of terminals at one end of the connections, a carriage comprising a bridge plate insulatively secured to said bridge plate and adapted to contact with the terminals passing through the slots in said guide in succession as said brid e is moved, means for mounting signal amps upon said bridge plate, electrical connections between said spring contacts and the si a1 lamps, and means for connecting said signal lamps with the opposite terminals in succession as said carriage is movedwhereby said signal lamps will be lighted when the connections between the terminals are correct.

In witness whereof, I hereunto subscribe my name this 7th day of April, A. D., 1922.

JOHN MODONOUGH.