US3855850A

US3855850A - Wire wrap qualification test fixture

Info

Publication number: US3855850A
Application number: US00423499A
Authority: US
Inventors: J Norskog
Original assignee: General Telephone Company of California
Current assignee: Frontier California Inc
Priority date: 1973-12-10
Filing date: 1973-12-10
Publication date: 1974-12-24
Anticipated expiration: 1991-12-24

Abstract

A mounting plate is designed to be secured to the front of a cross-connect frame in a telephone facility and to rotatably support a test terminal holding block. The arrangement is such that test terminals may be clamped transversely in the block with their opposite ends extending from the opposite sides of the block for testing the quality of wire wrapping tool bits used at the facility for making electrical connections. The fixture is characterized in that the terminal ends of the test terminals on one side of the fixture can be wire wrapped and then the terminal holder rotated 180* to position the opposite terminal ends on the same one side for wire wrapping and testing. Qualification tests of wire wrap tool bits can thus be made on the spot rather than having to deliver the wire wrap tool bits to a remote testing area.

Description

ilnited States Patent [191 Norslrog [451 Dec. 24, 1974 [75] Inventor:

[ WIRE WRAP QUALIFICATION TEST FIXTURE James Norskog, Los Angeles, Calif.

[73] Assigneei General Telephone Company of California, Santa Monica, Calif.

[22] Filed: Dec. 10, 1973 [21] Appl. No.: 423,499

[52] US. Cl. 73/88 13, 29/203 J, 73/103,

269/321 WE [51] Int. Cl. G01n 3/02 [581' Field of Search 73/88 B, 103; 29/203 J,

29/203 F; 269/321 WE, 55; 324/158 F; 108/142; 248/418, 425

[56] References Cited UNITED STATES PATENTS- 1,666,392 4/1928 Masury 248/418 3,098,378 7/1963 Marsh 73/103 3,232,101 2/1966 Siegler, 73/134' 3,312,460 4/1967 Kaufman 269/321 WE 3,354,708 11/1967 Joron 3,743,270 7/1973 Kaufman 29/203 .1 X

Primary Examiner-Charles A. Ruehl Attorney, Agent, or FirmPastori za & Kelly I [5 7] ABSTRACT A mounting plate is designed to be secured to the front of a cross-connect frame in a telephone facility and to rotatably support a test terminal holding block.

The arrangement is such that test terminals may be clamped transversely in the blockwith their opposite ends extending from the opposite sides of the block for testing the quality of wire wrapping tool bits used at the facility for making electrical connections. The

fixture is characterized in that the terminal ends of the test terminals on one side of the fixture can be wire wrapped and then the terminal holder rotated 180 to position the opposite terminal ends on the same one side for wire wrapping and testing. Qualification tests .of wire wrap tool bits can thus be made on the spot rather than having to deliver the wire wrap tool bits to a remote testing area.

4 Claims, 4 Drawing Figures QUALCATION TEST is I:

This invention relates generally to telephone operations and more particularly to a test fixture for wire wrap tool bits used in effecting telephone wire connections to terminals.

" BACKGROUND OF THE INVENTION In telephone facilities incorporatingcross-connect frames or bays, it is common practice to make wire connections to terminals by means of a wire wrap tool.

a not require any solder, the wire being retained on the terminal simply by friction.

After extended use, the bit in the wire wrap gun can become worn or out of adjustment in such a manner that the wire wraps may not meet quality standards required to assure reliable connections. In this respect, the wire might be wrapped too loosely in which event it can easily be pulled off of the terminal pin or it might be wrapped too tightly in which event the wire may actually break. It is thus common practice to run tests on the quality of the wire wrap tool bits by sending the bit portion of the gun to a remote central station where testing facilities are provided. Normally, the wire wrap far preferable if the worker himself could conduct the quality tests on his own wire wrap tool bits at the site where he is working.

- BRIEF DESCRIPTION OF THE PRESENT INVENTION With the foregoing in mind, the present invention contemplates the provision of a wire wrap qualification test fixture which is designed to be secured directly to a cross-connect frame where atelephone worker is making terminal connections. By means of this fixture together with suitable test terminals, the worker can periodically as required conduct a quality test on his wire wrap tool bits.

More particularly, the qualification test fixture comprises a mounting means and a test terminal holding FIG. 2 is an exploded, perspective view of the basic components making up the test fixture of FIG. 1;

FIG. 3 is an endview of the fixture of FIG. 2 when in assembled relationship for making a test; and,

FIG. 4 is an end view similar to FIG. 3 but illustrating the manner in which the test terminal holder portion of the fixture may be rotated l80 to enable tests to be carried out on terminal ends extending from an opposite side.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to FIG. l.there isshown the front of a cross-connect frame 10 which typically supports terminal blocks 11 supporting various terminals 12 in a telephone facility. Telephone workers will normally effect connection of telephone wires to the individual terminals 12 by means of a wire wrap gun. Essentially, the wire wrap gun includes a rotatable bit having a small groove for receiving an uninsulated end portion of a wire to be connected to a terminal. A sleeve surrounds the bit and the bit is caused to rotate within the sleeve,

the terminal pin itself being received in a central opening in the bit. The action is such that the wire is tightly wrapped about the terminal to effect the desired electrical connection.

The quality of the wire wrap depends on maintaining the wire wrap tools, particularly the bit portions in proper condition. Therefore, as mentioned heretofore,

it is normal practice to conduct a quality test on wire wraps effected by any one bit after the bit has been used for 5,000 wraps or for 1 month, whichever occurs sooner.

Normally, two tests are performed: first, a pull" test and second, a unwrap test. Thus to test the quality of a particular bit, it is used to wrap wire around several test terminal pins. After the wire is wrapped, a pull test is effected to determine if the wrapping is too loose. Normally, such a pull test is conductedon ten test wire wraps and if all 10 wraps remain on the terminals under a given pull force, they pass the test. Ten morewire wraps on 10 additional test terminals are then tested by an unwrapping of thesame to determine if any weakness or breakage has occurred in the wires. If these additional 10 wire wraps are all unwrapped with no evidence of weakening or breakage in the wires, they pass the test and it is known that the particular. bit used to wrap the 20 test terminals is in proper working order.

The present invention provides a wire wrap qualification test fixture designated generally by the numeral 13 means'coupled to the mounting means for rotation of 180. With this arrangement, the opposite ends of test terminals held in the holding means may be wire wrapped and tested from one side of the fixture by first wire wrapping the terminal ends on said one side and then rotating the holding means l80 to position the opposite terminal ends on said one side for wire wrapping and testing.

BRIEF DESCRIPTION OF THE DRAWINGS A better understanding of the invention will be had by nowreferring to the accompanying drawings in which:

FIG. 1 is a fragmentary perspective view of a portion of a cross-connect frame to which the qualification test fixture of this invention is secured;

in FIG. 1 which may be secured directly to the front of the cross-connect frame 10, as by'means of a mounting plate 14. A test temiinal holding means 15 in turn is rotatably mounted to the plate 14.

Referring specifically to FIG. 2, details of the test fixture are shown. Thus, the test terminal holding means 15 includes an elongated horizontal block 16 having a central longitudinal channel 17 for slidably receiving an elongated horizontal bar 18 shown exploded above the block 16. The tops of the block 16 and bar 18 include

transverse slots

19 and 20 respectively. The arrangement is such that when the bar 18 is longitudinally positioned in the channel 17 the

slots

19 and 20 can be transversely aligned.

The

slots

19 and 20 are dimensioned to receive test terminals one of which is shown at 21. Each of the test terminals has oppositely extending terminals ends such as indicated at 22 and 23.

In order to clamp the test terminals within the slots when the bar 18 is assembled in the channel 17, there is provided a tightening means in the form of a threaded stud 24 at one end of the bar 18 as shown in FIG. 2. This stud is arranged to pass through an opening in an end member 25 secured at one end of the channel 17. A washer and nut assembly 26 is threadedly receivable on the extending end of the stud 24 and it will be evident that tightening of the nut assembly will move the bar 18 within the channel 17 towards a position in which the slots are misaligned. Thus, the slots may initially be aligned by longitudinal adjustment of the bar 18 and the various test terminals such as 21 inserted in the aligned slots. By then tightening on the nut assembly 26, the movement of the bar 18 tending to misalign its slots with the slots 19 on the block 16 thoroughly clamps the test terminals in place.

Still referring to FIG. 2, there is provided a joumalling shaft 27 vertically extending downwardly from the central underside of the block 16. This shaft is arranged to be journalled in a journalling bore 28 in a flange structure 29 secured to the plate 14.

The assembled relationship of the components is shown in the end view of FIG. 3. It will be noted that the block 16 and bar 18 assembly is essentially keyed in one of its test positions by engagement of the upper area along the upper edge of the plate 14 with the juxtaposed side wall of the block 16 as indicated at 30. In

other words, the block 16 is prevented from rotation about the vertical journalling axis when in this position. In this respect, the vertical axis of the journalling bore in the flange 29 is at the same spacing from the plane of the plate 14 as the spacing of the axis of the shaft 27 from opposite longitudinal sides of the block 16. Thus, one side or the other is in a flush engagement with the top edge area 30 of the plate 14.

In FIG. 3, extending ends of test terminals, such as the terminal 21, on one side of the fixture are shown wire wrapped as at 31, the insulation 32' of the wire being removed on that portion which wraps about the terminal end 22. A "pull" test can be effected on the wire'wrap as by a pull tool 33 which has a force measuring scale indicating the force of pulling on the winding 31.

Referring now to FIG. 4, the block and

bar assembly

16 and 18 are shown pulled upwardly so that the side of the block 16 clears the upper edge 30 of the plate 14. In this position, it will also be noted that the shaft 27 is still partially journalled in the bore of the flange 29 so that the assembly can be rotated 180 to bring the oppositely extending terminal ends to the same side formerly occupied by the first mentioned terminal ends.

Thus, as shown in FIG. 4, the terminal end 23 of the test terminal 21 is in a position for testing wherein a wire wrap 34 has been formed thereon. An unwrap test may now be performed by means of an unwrap tool 35 so that the wire wrap 34 can be inspected to see if there is any breakage or weakening as would result if wound too tightly on the terminal end 23. It will be understood. of course, that after rotation of the assembly 180 it is lowered into the position illustrated in FIG. 2 so that the opposite side of the block 16 is keyed against the upper edge area 30 to again secure the sembly against rotation during test.

OPERATION The operation of the fixture will be evident from the foregoing description. As illustrated in FIG. 1, the fixture mounting plate 14 is simply secured to a front portion of the cross-connect frame 10 and the block and bar assembly making up the test terminal holder coupled to the plate by insertion of the shaft 27 in the journalling bore 28.

In the preferred embodiment and in accord with requirements of qualification tests, there are provided ten sets of transverse slots so that ten test terminals such as 21 indicated in FIG. 2 can be mounted in the slots and clamped by means of the tightening nut assembly 26. Ten terminal ends will thus project from the front side of the fixture and ten terminal ends will project from the opposite side.

After a telephone worker has made 5,000 wire wraps or after one month has passed, and the time has arrived to conduct a qualification test on his wire wrap tool bit, he will simply insert test terminals such as indicated at 21 in the fixture as described and use his gun to wrap wire around the ten extending terminal ends facing him. The worker may then conduct a pull test by means of the tool 33 described in FIG. 3 to see if the wire wraps are sufficiently secure on the pins. If any one of the ten test sample wire wraps pulls off under a given force, then the wire wrap tool has failed the pull test.

Thereafter, or even before any testing, the operator may simply lift up the .block and bar assembly to the position illustrated in FIG. 4 and rotate the entire assembly and then drop it back in place so that it is securely keyed against rotation by engagement of the upper area of the plate with the side of the block as described. The opposite terminal ends are then facing the worker and he can wire wrap these ten pins and thereafter conduct the unwrap test with the unwrapping tool 35 of FIG. 4. If any one of the wire wraps after unwrapping evidences any weakness or breakage, then the wire wrap tool bit has failed the unwrap" test.

From the foregoing, it will be evident that the present invention has provided a very convenient qualification test fixture which can be conveniently located in the area where a worker is working and is so designed as to provide a total of 20 test terminals so that the specifications for proper qualification testing can be readily carried out.

While the invention has been described in conjunction with telephone operations, it will, of course, be understood that the wire wrap qualification test fixture may be used in other environments for testing the quality of a wire wrapping tool bit.

What is claimed is:-

l. A wire wrap qualification test fixture comprising, in combination:

a. mounting means including a flat plate having a vertical journalling bore;

b. a test terminal holding means including an elongated horizontal block having a shaft extending vertically downwardly from its central underside to be received in said bore for rotation of 180; and

c. keying means constituting an upper edge area of said flat plate and the juxtaposed lower side area of said block, lifting of said block abovethe level of said upper edge freeing the block for rotation, said 2. A wire wrap qualification text fixture comprising,

in combination:

a. a mounting plate having means for securement to a cross-connect frame so as to lie in a vertical plane;

b. means on said mounting plate defining a joumalling bore having a vertical axis in spaced parallel relationship to the plane of said mounting plate;

0. a test terminal holder in the form of an elongated horizontal block and bar assembly, said block having a longitudinal central channel slidably receiving said bar, said block and bar assembly having transverse slots across their tops which may be transversely aligned by adjusting the longitudinal position of said bar in-said channel, said aligned slots being dimensioned to receive test terminals;

d. tightening means associated with said block and bar for moving said bar along said channel so that test terminals inserted in said slots may be clamped by the block and bar when the bar is moved towards a position in which said slots are out of alignment; and,

e. a shaft extending vertically from the central underside of said elongated block with its axis spaced equally from the opposite longitudinal side of the block, a distance corresponding to the spacing of 35 the axis of the joumalling bore from said mounting plate, said shaft being dimensioned to be joumalled in said joumalling bore on said mounting plate such that a lower area of one of the longitudinal sides, of the block seats flush against the mounting plate so that the elongated block and bar assembly is securely held by said plate, the length of the shaft in said bore being greater than the vertical height of the lower area of the side seated against the plate, whereby the elongated block and bar assembly may be lifted vertically to free the side from the plate without completely removing the shaft from its joumalling bore, and rotated 180 and lowered so that the opposite side of the block engages the plate to secure the assembly such that wire wrap tests can be performed on the oppositely extending ends of test terminals held in the slots from the same side of said cross-connect frame.

3. A test fixture according to claim 2, in which said tightening means comprises a threaded stud extending from one end of said bar; an end member secured at one end of said channel to said block and having an opening through which said stud extends; and a nut threadedly received on said extending stud such that tightening of said nut slides said bar along said channel.

Claims

1. A wire wrap qualification test fixture comprising, in combination: a. mounting means including a flat plate having a vertical journalling bore; b. a test terminal holding means including an elongated horizontal block having a shaft extending vertically downwardly from its central underside to be received in said bore for rotation of 180*; and c. keying means constituting an upper edge area of said flat plate and the juxtaposed lower side area of said block, lifting of said block above the level of said upper edge freeing the block for rotation, said block still being rotationally coupled to said mounting means in its raised position but free to rotate 180* whereby the opposite ends of test terminals held in said holding means may be wire wrapped and tested from one side of said fixture by first wire wrapping the terminal ends on said one side and then rotating said holding means 180* to position the opposite terminal ends on said one side for wire wrapping and testing.

2. A wire wrap qualification text fixture comprising, in combination: a. a mounting plate having means for securement to a cross-connect frame so as to lie in a vertical plane; b. means on said mounting plate defining a journalling bore having a vertical axis in spaced parallel relationship to the plane of said mounting plate; c. a test terminal holder in the form of an elongated horizontal block and bar assembly, said block having a longitudinal central channel slidably receiving said bar, said block and bar assembly having transverse slots across their tops which may be transversely aligned by adjusting the longitudinal position of said bar in said channel, said aligned slots being dimensioned to receive test terminals; d. tightening means associated with said block and baR for moving said bar along said channel so that test terminals inserted in said slots may be clamped by the block and bar when the bar is moved towards a position in which said slots are out of alignment; and, e. a shaft extending vertically from the central underside of said elongated block with its axis spaced equally from the opposite longitudinal side of the block, a distance corresponding to the spacing of the axis of the journalling bore from said mounting plate, said shaft being dimensioned to be journalled in said journalling bore on said mounting plate such that a lower area of one of the longitudinal sides of the block seats flush against the mounting plate so that the elongated block and bar assembly is securely held by said plate, the length of the shaft in said bore being greater than the vertical height of the lower area of the side seated against the plate, whereby the elongated block and bar assembly may be lifted vertically to free the side from the plate without completely removing the shaft from its journalling bore, and rotated 180* and lowered so that the opposite side of the block engages the plate to secure the assembly such that wire wrap tests can be performed on the oppositely extending ends of test terminals held in the slots from the same side of said cross-connect frame.

4. A test fixture according to claim 3, in which there are provided ten transverse slots across the tops of said block and bar so that ten individual test terminals may be secured in said assembly, and wherein wire pull tests can be conducted on ten of the extending ends of the test terminals from one side of the assembly and wherein unwrap tests can be conducted on the ten extending opposite ends of the test terminals after rotating the assembly 180*.