US1904226A - Cable maintenance apparatus - Google Patents

Cable maintenance apparatus Download PDF

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Publication number
US1904226A
US1904226A US418144A US41814430A US1904226A US 1904226 A US1904226 A US 1904226A US 418144 A US418144 A US 418144A US 41814430 A US41814430 A US 41814430A US 1904226 A US1904226 A US 1904226A
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Prior art keywords
contactor
cable
terminal
alarm
chamber
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US418144A
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Thomas C Henneberger
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AT&T Corp
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American Telephone and Telegraph Co Inc
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Priority to US418144A priority Critical patent/US1904226A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2838—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for cables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/181—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for cables

Definitions

  • This invention relates to apparatus for use in connection with the maintenance of cables, and more particularly to apparatus for use with cables which are held continuously under gas pressure.
  • the cable may be isolated into sections of convenient length by gas-tight plugs, and pressure gauges, associated with an electric alarm circuit, may be installed atv one ormore points along each isolated section.
  • the two pairs of a spare quad inthe cable are ordinarily used to form the wires of the alarm circuit and the wires ot a talking circuit for the use o field men.
  • the pressure gauges are adapted to be connec-ted in parallel across the alarm pair. At each et the'points where the alarm pair is brought out of the cable for connection to a gauge, terminal facilities are usually provided through which the desired connections be made for the talking-pair, the alarm pair and the pressure gauge.
  • @ne object of the present invention is the provision of terminal facilities suited to the above-stated use.
  • Another' object of the invention is the provision of a suitable combi; nation ci: cable terminal vand low pressure alarm contactor for use with a cable maintained under pressure.
  • a further object of the invention is the provision of terminal apparatus adapted not only for suitablecombination with a low pressure alarm contactor but also for use with the contactor removed, as in the case in which it is desired to bring out :from the cableonly the talking pair.
  • the invention takes the form of an arrangement ofa gas-tight chamber adapted ier connection with a cable sleeve or the like, binding posts and suitable means for elif-acting the desired connection between the chamber and the binding posts and a low pressure alarm contactor.
  • the invention will be clearly understoo when the following detailed description of the most partv in section on the line 3 3 of Fig. 2; v
  • llig. 4 is a sectional view of the apparatus intermediate to the terminal and the contactor, taken on the line 4 4 of Fig. 3;
  • Fig. 5 is a similar view taken on line 5 5 of Fig. 3;
  • Fig. 6 is a sectional view taken approximately on the line 6 6 of ⁇ Fig. 4 or on the line 6 6 of Fig. 5;
  • Fig. 7 is a diagram indicating the circuit connections made through the terminal.
  • vrst to - ⁇ Fig. 1 of the drawing, two gauges are indicated connected in parallel across the alarm pair, which termi nates in suitable apparatus, such as the relay and bell indicated, at a repeater station, for instance.
  • suitable apparatus such as the relay and bell indicated, at a repeater station, for instance.
  • the diagram indicates that the talking pair and the alarm pair are brought out for connection or looping through a terminal.
  • the terminal 8 consists essentially of a. gas-tight metal chamber 9 with a bolted face plate 10 through which extend insulated binding posts 11, 12, 13, 14, 15, 16, i17, 18, 19 and 20.
  • the chamber 9 should be made gas-tight by the use of a gasket v23 for the faceplate 10 and the use of gaskets such as 24 for the binding posts.
  • the cover 21 may be securely closed by the use of wing nuts such as 25 and 26.
  • the terminal is provided, at 151e oppositev end of the chamber 9 to that to which is attached the sleeve 27, with a reducing nipple 32, and the connection is made to the con-I tactor 28 vthrough the piperunion 33 and the reducing nipple 34.
  • Jack apparatus is mounted in the insulating member 35 of the reducing nipple 32,l and plug apparatus isl mounted in the insulating member 36 of reducing nipple 34.
  • One plug takes the form of a central metal pin 37, and the other plug takes the form of a metal tubing 38 molded in the -insulating material concentrically with the pin 37.
  • the jack springs 41 are mounted in the insulating member 35, and suitable receptacles are provided vfor the engagement of these springs with the in 37 and the tub- 1ng 38.
  • the plug and ack assemblies are, of course, tightly secured in their respective reducing nipples 34 and 32, and holes 39 and 40 and 39 and 40 (see Figs. 4 and 5 and indication of 40 and 40'/ in Fig. 3) are provlded to permit the gas to pass from the chamber 9 of the terminal into the contactor 28.
  • Fig. 3 the right portions ofthe members 35 and 36 are b shown without full regard for the sectional vlew on line of Fig. 2 in order to indicate the positions of the openings 40 and 40. It will be understood further that openings 39and 39', not shown in this figure, correspond to the openings 40 and 40 respectively. The locations of the openings 39, 40, 39' and 40 are accurately indicated in Figs. 4 and 5.
  • the wires from the cable are carried' through the sleeve 27 to the terminalchamber 9, and' the gas. from the cable. is admitted to the chamber 9.
  • the reducing nipple 32 can be calpped, and the terminal 8 will function suitab y for a poit at which it is desired to bring out l only a talking pair.
  • the terminal of course,
  • wires 43 form the section of the alarm pair passing out of the terminal- These pairs are connected to binding posts 13and 14, and 15 and r16, respectively.
  • the wires 44 form the section lof the talking pair passing into the cable to binding posts 17 and 18, while wires 45 form the section of the talking pair" 'passing out 'of the terminal from binding posts 19 and 20.
  • the wires. 46 connect binding posts 11 and 12 to the the reducing nipple 32.
  • the cable pressure falls below the normal value, or below a predeterminedvalue,r the decrease ofpressure operates to cause the straightening tendency of the-tube 29, and the making of contact between springs 30 and 31, and the alarm circuit is closed to operate the alarm bell or other device at the repeater station.
  • a ⁇ cable terminal device comprising a gas-tight chamber and a lurality of binding posts extending throug a. wall thereof, meansassociated with one end of said chamer for connecting the same to a cable sleeve or the like, a low pressure alarm contactor of the Bourdon tube type but having the inside f of the pressure responsive element at atmospheric pressure, and a connector between the l other end of said chamber and said contactor including meansv for effecting electrical connections between certain of said binding posts and the contacts of the contactor, said-connector being perforated to admit gas from said chamber to the interior of the contactor.
  • Acable terminal device comprising a gas-tight chamber and a.
  • bindln posts extending through a wall thereo las means associated with one end of said chainber for connecting the same to a cable sleeve or the like, a low pressure alarm contactor of the Bourdon tube type but having the inside of the pressure-responsive element at atmospheric pressure, and a concentric connector between the other end of said chamber and said contacter including means for 'i'ect ing electrical connections between certain of said binding posts and the contacts of the contactor, said connector being perforated to admit gas from said chamber to the interior of the contactor.
  • a cable terminal device comprising a gas-tight chamber and a plurality of binding posts, extending through a wall thereof, means associated with one end of said cham'- ber for connecting the same to a cable sleeve or the like, a low pressure alarm contactor of ther Bourdon tube type but having the inside of the pressure-responsive element at atmospheric pressure, and a connector for y connecting the other end of said chamber and s aid contactor to admit gas to the interior of the contactor, said ,connector including means to effect electrical connections between certain of said binding posts and the contacts of the contactor, said electrical connections being independent of rotation of said contactor with respect to the gas-tight chamber.

Description

pril 18, 1933.
T. C. HENNEBERGER CABLE MAINTENANCE APPARATUS Filed Jan. 2, 1930 /VZarnb `11ressure f' Guayas Quad m awk am@ Paff- V INVENTOR Z'Clelm eblyef "f L s1 C ATTORNEY Patented Apr. 18 1933 @UNITED s'rn'rrzsl THOMAS G. HENNEBEBGER, OF BLOOFIELD, NEW JERSEY, ASSIGNOB TO AMERICAN TIEILEPHONE AND TELEGRAIH CDMIANY, A CORPORATION OF NEW YORK VGAIBIE MAINTENANCE APPARATUS Application filed 'January 2, 1930. Serial No. 418,144.
This invention relates to apparatus for use in connection with the maintenance of cables, and more particularly to apparatus for use with cables which are held continuously under gas pressure. p
. ylfhe purposes of maintaining cables under pressure are to prevent the entrance of moisture into the cable and to permit the locating of sheath openings before the occurrence of insulation trouble. To provide means tor detecting loss of pressure,the cable may be isolated into sections of convenient length by gas-tight plugs, and pressure gauges, associated with an electric alarm circuit, may be installed atv one ormore points along each isolated section. The two pairs of a spare quad inthe cable are ordinarily used to form the wires of the alarm circuit and the wires ot a talking circuit for the use o field men. The pressure gauges are adapted to be connec-ted in parallel across the alarm pair. At each et the'points where the alarm pair is brought out of the cable for connection to a gauge, terminal facilities are usually provided through which the desired connections be made for the talking-pair, the alarm pair and the pressure gauge.
@ne object of the present invention is the provision of terminal facilities suited to the above-stated use. Another' object of the invention is the provision of a suitable combi; nation ci: cable terminal vand low pressure alarm contactor for use with a cable maintained under pressure. A further object of the invention is the provision of terminal apparatus adapted not only for suitablecombination with a low pressure alarm contactor but also for use with the contactor removed, as in the case in which it is desired to bring out :from the cableonly the talking pair.
ln general, the invention takes the form of an arrangement ofa gas-tight chamber adapted ier connection with a cable sleeve or the like, binding posts and suitable means for elif-acting the desired connection between the chamber and the binding posts and a low pressure alarm contactor. The invention will be clearly understoo when the following detailed description of the most partv in section on the line 3 3 of Fig. 2; v
llig. 4 is a sectional view of the apparatus intermediate to the terminal and the contactor, taken on the line 4 4 of Fig. 3;
Fig. 5 is a similar view taken on line 5 5 of Fig. 3;
Fig. 6 is a sectional view taken approximately on the line 6 6 of `Fig. 4 or on the line 6 6 of Fig. 5; and
Fig. 7 is a diagram indicating the circuit connections made through the terminal.
- Likenumerals of reference in the several iigures of the drawing designate correspondmg parts.
With reference, vrst, to -`Fig. 1 of the drawing, two gauges are indicated connected in parallel across the alarm pair, which termi nates in suitable apparatus, such as the relay and bell indicated, at a repeater station, for instance. At each of the gauge points, the diagram indicates that the talking pair and the alarm pair are brought out for connection or looping through a terminal.
With reference, now, to the other figures of the drawing, the terminal 8 consists essentially of a. gas-tight metal chamber 9 with a bolted face plate 10 through which extend insulated binding posts 11, 12, 13, 14, 15, 16, i17, 18, 19 and 20. A gasketed cover 21, which should be water-tight but is not necessarily gas-tight, may be added to protect the binding posts, which projectinto the watertight chamber 22. The chamber 9 should be made gas-tight by the use of a gasket v23 for the faceplate 10 and the use of gaskets such as 24 for the binding posts. The cover 21 may be securely closed by the use of wing nuts such as 25 and 26.
, but differs from the ordinary arrangements based on this principle in that the inside of the Bourdon tube 29 is at atmospheric-pressure, and this tube, when curled by suiicient pressure in the device 28, holds contact springs 30 and 31 open. When the pressure introduced through the housing decreases, the tube 29 tends to straighten and closes the Contact of springs 3() and 31. It will be understood that any suitable low pressure alarm contactor which operates in substantially this manner, may be employed in place of that specifically shown in F 2. The terminal is provided, at 151e oppositev end of the chamber 9 to that to which is attached the sleeve 27, with a reducing nipple 32, and the connection is made to the con-I tactor 28 vthrough the piperunion 33 and the reducing nipple 34. Jack apparatus is mounted in the insulating member 35 of the reducing nipple 32,l and plug apparatus isl mounted in the insulating member 36 of reducing nipple 34. One plug takes the form of a central metal pin 37, and the other plug takes the form of a metal tubing 38 molded in the -insulating material concentrically with the pin 37. The jack springs 41 are mounted in the insulating member 35, and suitable receptacles are provided vfor the engagement of these springs with the in 37 and the tub- 1ng 38. The plug and ack assemblies are, of course, tightly secured in their respective reducing nipples 34 and 32, and holes 39 and 40 and 39 and 40 (see Figs. 4 and 5 and indication of 40 and 40'/ in Fig. 3) are provlded to permit the gas to pass from the chamber 9 of the terminal into the contactor 28.
It will be understood thatin Fig. 3 the right portions ofthe members 35 and 36 are b shown without full regard for the sectional vlew on line of Fig. 2 in order to indicate the positions of the openings 40 and 40. It will be understood further that openings 39and 39', not shown in this figure, correspond to the openings 40 and 40 respectively. The locations of the openings 39, 40, 39' and 40 are accurately indicated in Figs. 4 and 5.
As has .been stated above, the wires from the cable are carried' through the sleeve 27 to the terminalchamber 9, and' the gas. from the cable. is admitted to the chamber 9. If the terminal but not the contactor is to be used, the reducing nipple 32 can be calpped, and the terminal 8 will function suitab y for a poit at which it is desired to bring out l only a talking pair. The terminal, of course,
provides facilities for looping the alarm and talking pairs, If, on the other hand, the low pressure alarm contactor is to be combined with the terminal 8, the connecting arrangement shown is most advantageous. The con-l In Fig. 7, the wires v42form the section of' the alarm pair passing into the terminal, and
wires 43 form the section of the alarm pair passing out of the terminal- These pairs are connected to binding posts 13and 14, and 15 and r16, respectively. The wires 44 form the section lof the talking pair passing into the cable to binding posts 17 and 18, while wires 45 form the section of the talking pair" 'passing out 'of the terminal from binding posts 19 and 20. The wires. 46 connect binding posts 11 and 12 to the the reducing nipple 32.
As indicated above, when the pressureinthe cable is normal, the tube 29 of the contactor operates to hold the springs 30 and 31 apart,
jack-springs 41 in I and the alarm circuit (Fig. 1) is open. If,
however, the cable pressure falls below the normal value, or below a predeterminedvalue,r the decrease ofpressure operates to cause the straightening tendency of the-tube 29, and the making of contact between springs 30 and 31, and the alarm circuit is closed to operate the alarm bell or other device at the repeater station.
What is claimed is: 1. A `cable terminal device, comprising a gas-tight chamber and a lurality of binding posts extending throug a. wall thereof, meansassociated with one end of said chamer for connecting the same to a cable sleeve or the like, a low pressure alarm contactor of the Bourdon tube type but having the inside f of the pressure responsive element at atmospheric pressure, and a connector between the l other end of said chamber and said contactor including meansv for effecting electrical connections between certain of said binding posts and the contacts of the contactor, said-connector being perforated to admit gas from said chamber to the interior of the contactor. l 2. Acable terminal device, comprising a gas-tight chamber and a. plurality of bindln posts extending through a wall thereo las means associated with one end of said chainber for connecting the same to a cable sleeve or the like, a low pressure alarm contactor of the Bourdon tube type but having the inside of the pressure-responsive element at atmospheric pressure, and a concentric connector between the other end of said chamber and said contacter including means for 'i'ect ing electrical connections between certain of said binding posts and the contacts of the contactor, said connector being perforated to admit gas from said chamber to the interior of the contactor.
3. A cable terminal device, comprising a gas-tight chamber and a plurality of binding posts, extending through a wall thereof, means associated with one end of said cham'- ber for connecting the same to a cable sleeve or the like, a low pressure alarm contactor of ther Bourdon tube type but having the inside of the pressure-responsive element at atmospheric pressure, and a connector for y connecting the other end of said chamber and s aid contactor to admit gas to the interior of the contactor, said ,connector including means to effect electrical connections between certain of said binding posts and the contacts of the contactor, said electrical connections being independent of rotation of said contactor with respect to the gas-tight chamber. In testimony'whereof, I have signed my name to this specification this 31st day of .December 1929.
35 THOMAS c. HENNEBERGER.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717989A (en) * 1952-02-06 1955-09-13 Bossard Karl Automatic signalling and warning device for liquid-tanks
US2749743A (en) * 1952-07-29 1956-06-12 S W Farber Inc Apparatus for testing hollow objects
US2788658A (en) * 1951-12-01 1957-04-16 Ericsson Telefon Ab L M Apparatus for indicating and localizing leaks in gas-pressure protected cables
US5880535A (en) * 1997-10-14 1999-03-09 Honeycutt; Larry W. Tap resistant security circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2788658A (en) * 1951-12-01 1957-04-16 Ericsson Telefon Ab L M Apparatus for indicating and localizing leaks in gas-pressure protected cables
US2717989A (en) * 1952-02-06 1955-09-13 Bossard Karl Automatic signalling and warning device for liquid-tanks
US2749743A (en) * 1952-07-29 1956-06-12 S W Farber Inc Apparatus for testing hollow objects
US5880535A (en) * 1997-10-14 1999-03-09 Honeycutt; Larry W. Tap resistant security circuit

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