US3797007A - Circuit interrupter protective device - Google Patents

Circuit interrupter protective device Download PDF

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Publication number
US3797007A
US3797007A US00346230A US3797007DA US3797007A US 3797007 A US3797007 A US 3797007A US 00346230 A US00346230 A US 00346230A US 3797007D A US3797007D A US 3797007DA US 3797007 A US3797007 A US 3797007A
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US
United States
Prior art keywords
armature
lever
protective device
circuit interrupter
core assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00346230A
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English (en)
Inventor
J Salvati
P Skalka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
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Westinghouse Electric Corp
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Publication date
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Publication of US3797007A publication Critical patent/US3797007A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7463—Adjusting only the electromagnetic mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
    • H01H69/01—Apparatus or processes for the manufacture of emergency protective devices for calibrating or setting of devices to function under predetermined conditions
    • H01H2069/013—Apparatus or processes for the manufacture of emergency protective devices for calibrating or setting of devices to function under predetermined conditions with calibrating screws in trip bar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H2071/7481—Means for adjusting the conditions under which the device will function to provide protection with indexing means for magnetic or thermal tripping adjustment knob
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating elements

Definitions

  • ABSTRACT A circuit interrupter protective device responsive to abnormal currents in conductors of an electrical distribution system characterized by a circuit breaker within a first insulating housing and having a mechanism for opening and closing separable contacts which mechanism comprises a releasable member movable between latched to unlatched positions, trip means comprising a stationary magnetic structure for each conductor as well as a coil and core assembly, an armature therefor, a trip bar movable to unlatch the circuit breaker mechanism and biased in the latched position, lever means associated with the stationary magnetic structure for moving the trip bar to the unlatched position, the lever means comprising the armature and being movable in response to abnormal currents in at least one of the conductors, the lever means being biased away from the core assembly, and means for increasing the electrical current range between maximum and minimum air gaps of the magnetic circuit.
  • This invention pertains to a protective device for a circuit interrupter and more particularly it pertains to a monitoring means within an insulating housing for increasing the spread between maximum and minimum air gaps in a magnetic circuit.
  • circuit breakers that comprise overcurrent protective devices have external mounting means for such devices on the circuit breaker housing such as disclosed in U.S. Pat. No. 3,530,414. Circuit breakers of that type have functioned satisfactorily for responding to such abnormal currents as overcurrents, ground fault currents, and short circuits that occur in an electrical distribution system.
  • circuit breakers of that type have functioned satisfactorily for responding to such abnormal currents as overcurrents, ground fault currents, and short circuits that occur in an electrical distribution system.
  • certain disadvantages result from that type of construction including the inability to increase the current spread between minimum and maximum air gaps in the magnetic circuit. I
  • a protective device for a circuit interrupter which device comprises a stationary magnetic structure for each conductor of an electrical distribution system and comprising a coil and core assembly, an armature, a trip bar movable to effect tripping of the circuit breaker mechanism and being biased in the latched position, the lever means associated with each stationary magnetic structure for moving the trip bar to the unlatched position, the lever means comprising the armature and being movable in response to abnormal currents in at least one of the conductors, the lever means comprising a lever which is biased away from the core assembly, and means for spreading the range between the minimum and maximum air gaps in the magnetic circuit.
  • the advantage of the device of this invention is that it provides for a more compact tripping unit as well as a more efficient unit.
  • FIG. 1 is a vertical sectional view of a multi-pole circuit breaker
  • FIG. 2 is a vertical sectional view taken on the line 11-11 of FIG. 1;
  • FIG. 3 is a vertical sectional view taken on the line IlIllI of FIG. 1;
  • FIG. 4 is a vertical sectional view taken on the line lV--IV of FIG. 3;
  • FIG. 5 is a vertical sectional view taken on the line VV of FIG. 3;
  • FIG. 6 is a plan view of the trip device shown in FIGS. 2-5.
  • a circuit breaker is generally indicated at 3 and it comprises an insulating housing 5 and a circuit breaker mechanism 7 supported within the housing.
  • the housing 5 comprises an insulating base 9 and an insulating cover 11.
  • the circuit breaker mechanism 7 comprises an operating mechanism 13, and a latch and trip device 15. Except for the latch and trip device, the circuit breaker 3 is of the type that is generally described in the patent to Albert R. Cellerini et al., U.S. Pat. No. 3,287,534 issued Nov. 22, 1966.
  • the circuit breaker 3 is a threepole circuit breaker comprising three compartments disposed in side-by-side relationship.
  • the center pole compartment (FIG. 1) is separated from the two outer pole compartments by insulating barrier walls formed with the housing base 9 and cover 11.
  • the operating mechanism 13 is disposed in the center pole compartment and is a single operating mechanism for operating the contacts of all three pole units.
  • Each pole unit comprises a stationary contact 21 that is fixedly secured to a rigid main conductor 23 that in turn is secured to the base 9 by bolts 25.
  • a movable contact 27 is secured, such as by welding or brazing, to a contact arm 29 that is mounted on a switch arm 31 by a pivot pin 33.
  • the arms 29 and 31 for all three of the pole units are supported at one end thereof and rigidly connected on a common insulating tie bar 35 by which the arms of all three pole units move in unison.
  • Each of the contact arms 29 is biased about the associated pivot pin 33 by means of a spring 37 to provide contact pressure in the closed position.
  • the operating mechanism 13 actuates the switch arms 31 between open and closed positions.
  • the mechanism comprises a pivoted formed operating lever 39, a toggle comprising two toggle links 41 and 43, overcenter springs 45 and 47, and a pivoted releasable cradle or arm 49 controlled by the trip device 15.
  • An insulating shield 51 for substantially closing an opening 53 in the cover 11, is mounted on the outer end of the op erating lever 39 and has an integral handle portion 55 extending out through the opening to enable manual operation of the breaker.
  • the toggle links 41 and 43 are pivotally connected together by a knee pivot pin 57.
  • the toggle link 41 is pivitally connected to the releasable arm 49 by a pin 59
  • the toggle link 43 is pivotally connected to the switch arm 31 of the center pole unit by a pin 61.
  • the overcenter springs 45 and 47 are connected under tension between the knee pivot pin 57 and the outer end of the operating lever 39.
  • the circuit breaker is manually operated to the open position by movement of the handle portion 55 in a counterclockwise direction to the off position, which movement actuates the overcenter springs 45, 47 to collapse the toggle links 41 and 43 to the position shown in FIG. 1, and opening movement of the contact arm 29 for all of the pole units in a manner well known in the art.
  • the circuit breaker is manually closed by reverse movement of the handle portion 55 from the off position to the on position, which movement causes the springs 45, 47 to move overcenter and straighten the toggle links 41, 43, thereby moving the contact arm 29 for all of the pole units to the closed position as shown in broken line position.
  • the trip device 15 serves to effect automatic release of the releasable cradle or arm 49 and opening of the breaker contacts for all of the pole units, in response to predetermined overload conditions in the circuit breaker through any or all pole units of the circuit breaker, in a manner described hereinbelow.
  • each pole unit extends from a right-hand terminal 63 through the conductor 23, the contacts 21, 27, the contact arm 29, a flexible conductor 65, that is secured to the contact arm 29, a conductor 67, a trip conductor 69, and to a left-hand terminal connector 71.
  • Bolt means 73 secure one end of the trip conductor 69 to the conductor 67 and the other end of the trip conductor 69 is disposed between a backup plate 75 and the terminal 71 where it is secured in place by mounting bolt 77 of the terminal 71.
  • the latch and trip device 15 comprises a molded insulating housing base 81 and a molded insulating housing cover 79 secured to the base to enclose a molded insulating trip bar 83 that is common to all three of the pole units.
  • the base 81 includes a pair of spaced partitions 85 and 87 which are vertically disposed and integral with the base for separating the interior of the housing into three compartments, each compartment containing one of the three poles.
  • the cover 79 is provided with partitions corresponding to partitions 85 and 87 and having mating surfaces therewith in a manner similar to the mating surfaces of the peripheral surfaces of the base 81 and cover 79 as indicated by a parting line 89 (FIG. 6).
  • each section of the trip bar 83 located within the space compartments of the housing comprise upper and lower portions 83a and 83b, which are above and below the axis of rotation of the trip bar.
  • Each upper portion 83a is provided with an adjusting screw and nut assembly 99 which cooperates with a bimetal member 101 (FIG.
  • the lower end portion 83b of the trip bar 83 is preferably provided with a drive screw 103 by which contact is made with an adjoining member for similar rotation of the trip bar in the manner to be described hereinbelow.
  • the trip conductor 69 includes an inverted U-shaped intermediate portion 69a which constitutes a single loop of a stationary magnetic structure.
  • Stationary magnetic structure also comprises a magnetic core 105, a U-shaped frame 107 having a pair of spaced flanges 109 one of which is shown in FIG. 5, and an armature 111.
  • the assembly of the intermediate U-shaped portion 69a, the core 105, and the intermediate portion of the frame 107 together with the lower portion of the bimetal member 101 are secured in place by suitable means such as rivets 113 on the housing base 79.
  • the lower end portion of the bimetal member 101 is in surface-to-surface contact with the conductor 69, whereby upon the occurrence of a low persistent overload current below a predetermined value of, for example, ten times normal rated current, the bimetal member 101 is heated and deflects to the right through an air gap dependent upon the setting of the adjustment screw 99.
  • a low persistent overload current occurs, the trip bar 83 is actuated to trip the circuit breaker.
  • the armature 111 is disposed between the space flanges 109 of the U-shaped frame 107 and is pivotally mounted therein to rotate about an axis 115 near the lower end of the armature.
  • the armature 111 is preferably mounted by suitable means such as rivets 117 on a support lever 119 having oppositely extending out-turned lugs 121 which are seated in corresponding openings 123 in the flanges 109.
  • Each flange 109 is also provided with a V-shaped notch 125 into which edge portions of the lever 119 and armature 111 extend. The notches 125 thereby limit movement of -the assembly of the lever 119 and armature 111 when the armature is attracted toward the core 105.
  • the assembly of the lever 119 and armature 111 which is biased in the clockwise direction by coil springs 127 (FIG. 3) is movable counterclockwise against the springs to engage the drive screw 103 and thereby rotates the trip bar 83 clockwise.
  • an overload current above a value such, for example, as ten times normal rated current or a short circuit current occurs, the stationary magnetic structure is energized and the armature 111 is attracted toward the core 105 causing instantaneous release of the releasable arm 49 and opening of the contacts 21 and 27.
  • each bracket 128 includes a notch 133 on each opposite side thereof which notch is seated in corresponding projections 135 of the housing base 79.
  • the bracket 128 comprises means for increasing the current spread between maximum and minimum air gaps of the magnetic circuit.
  • the bracket 128 is provided with means for positively adjusting and maintaining the armature in the proper position for the desired air gap.
  • the means comprise a tension spring 129 and spaced prongs or fingers 130, 132, 134.
  • the outer fingers 130 and 134 extend over one side of the armature 111 and the middle finger 132 extends on the other side of the armature. That is the middle finger 132 is located on the core side of the armature.
  • the fingers 130, 132, 134 may be an integral part of the bracket 128, or preferably part of a separate member that is fixedly attached to the bracket by suitable means such as rivets 136.
  • the fingers 132 and 134 are members that act to reduce the air gap when the adjusting screw 131 rotates the armature assembly clockwise.
  • the middle finger 132 acts as a leaf spring that flexes at different degrees depending upon the air gap setting.
  • the middle finger 132 exerts an additional force against the armature; that is, in addition to the forces exerted by the compression springs 127.
  • the leaf spring finger 132 In the maximum air gap position of the armature, the leaf spring finger 132 is bent more than in the minimum air gap position of the armature.
  • the middle finger 132 exerts a greater force on the armature in the maximum air gap setting than it does in the minimum air gap setting. This means that the over-current spread (5 to times normal rating) to trip the breaker magnetically between minimum and maximum air gap settings is therefore better controlled.
  • the finger 132 flexes in response to the adjustment and position of the bracket assembly 128, not in response to the armature movement.
  • the finger 132 exerts a force on the armature opposite to that of the springs 127.
  • the compression springs 127 are at their minimum values.
  • the spring are in maximum compression and therefore exert a greater force on the armature than the finger 132.
  • the force exerted on the armature by the finger 132 is greater in the maximum air gap setting than the force exerted on the armature at minimum air gap setting.
  • the reason for that is that the bend in the middle finger is greater at maximum air gap than the bend is on minimum air gap.
  • the amount of bend on the middle finger 132 can also be controlled by manually bending the finger in one direction or another to create more or less bend when assembled with the armature.
  • the tension spring 129 pulls the upper portion of the bracket assembly 128 against the camming portion of an adjusting knob 137.
  • the tension spring 129 also retains the upper portion of the bracket assembly 128 stationary as the middle finger bends, such as during calibration adjustments.
  • the bracket assembly pivots about the pivot 135.
  • the armature is retained in the preselected position by the finger 132 or one side and the fingers 130 and 134 on the other side.
  • the adjusting knob 137 is seated within the top end of the housing base and is provided with a lower end portion having a cam surface. Inasmuch as the bracket 128 is biased counterclockwise about its pivot point by the springs 127 of the lower lever 119, the calibration screw 131 rides on the cam surface of a lower camming portion 139 of the adjusting knob 137.
  • each adjusting knob 137 includes a flange 141, the lower surface of which includes spaced notches 143.
  • An index member 145 is disposed below the flange 143 and is provided with a projection 147 for engaging one of the spaced notches 143 as the calibrating screw 147 is rotated to the desired position. Accordingly, the desired spacing between the armature 111 and the core 105 is established by rotation of the adjusting knob 137.
  • a removable flexible shield 149 is disposed in an access opening 151 of the cover 79 in order to turn the calibrating screws 131 and 99. When the calibration is made, the shield 149 is replaced in the opening.
  • the mechanism by which the releasable arm 49 is released is shown in FIGS. 2, 4 and 6.
  • the mechanism includes the trip bar 83, a trip lever 153, and a latch lever 155.
  • a U-shaped mounting frame 157 is mounted on the base 81 with spaced upright sides 157a and 157b providing mounting support for the levers.
  • the trip lever 153 includes a U-shaped por tion 159 at the lower end which portion is mounted on a pivot pin 161 which extends from the side 1570 of the frame.
  • the U-shaped lower portion of the lever maintains the lever upright adjacent the frame side 157a.
  • the upper end of the trip lever 153 includes a flange 163 which engages a notch 165 on the trip bar 83. As shown in FIG. 4 a portion of the trip bar extends through an opening 167 in the insulating base 81.
  • the latch lever includes down-turned portions 155a and 155b which are mounted on a pivot pin 169 the opposite ends of which are secured in the sides 157a and 157k of the frame 157.
  • a spring 171 is mounted on the pin 169 and has end portions engaging the levers 153 and 155 for biasing the levers in the latched positions.
  • the arm which is pivoted on a pivot pin 173 is secured in the latched position below the lever 155 and applies a rotatable force thereon.
  • the latch lever 155 is prevented from turning due to engagement of the lower end of the lever on a pin 175 which is mounted in the U-shaped portion 159 of the trip lever 153.
  • the trip lever 153 is biased clockwise and is prevented from movement by engagement of the flange 163 in the notch of the trip bar 83.
  • the trip bar is rotated clockwise, the flange 163 is dislodged from the latched position within the notch 165 and the trip lever 153 rotates clockwise to move the pin from engagement with the lower end of the latched lever 155.
  • the latch lever 155 is free to rotate about the pin 169 and thereby unlatch the releasable arm 49 from the latched position.
  • a projection 177 extends from the upper corner of the trip bar portion 83a which projection is aligned with an aperture 179 (FIG. 4) in the housing base 79.
  • the trip bar may be tripped manually.
  • the device of the present invention provides an new and novel trip structure for a circuit breaker which comprises means for increasing the electrical current range between maximum and minimum air gaps of the magnetic circuit.
  • a circuit interrupter protective device for responding to abnormal currents in the conductors of an electrical distribution system and for actuating a circuit interrupter to open upon the occurrence of predetermined operating conditions, comprising a circuit breaker having a first insulating housing, a circuit breaker mechanism within the housing and comprising separable contacts adapted to be connected as part of the distribution system, the circuit breaker mechanism comprising a releasable member movable from a latched position to effect opening of the contacts, a
  • latch lever movable between latched and unlatched positions of the releasable member and being biased in the latched position
  • a stationary magnetic structure for each conductor of the distribution system and comprising a coil and core assembly, an armature, a trip bar movable to unlatch the latch lever and being biased in the latched position
  • lever means associated with each stationary magnetic structure for moving the trip bar to the unlatched position
  • the lever means comprising the armature and being movable in response to abnormal currents in at least one of the conductors
  • the lever means comprising an adjusting bracket which is biased away from the core assembly, the adjusting bracket comprising three spaced fingers, one finger being flexible and engaging the side of the armature facing the core assembly for maintaining predetermined spacings between the armature and the core assembly during normal current flow, and the flexible finger being yieldable to magnetic forces attracting the armature to the core assembly during the occurrence of an overload in the conductors.
  • circuit interrupter protective device of claim 1 in which the magnetic structure, the trip bar, the lever means, and the space adjusting means are mounted within a second insulating housing, and the second insulating housing being mounted within the first insulating housing.
  • circuit interrupter protective device of claim 2 in which means are provided for adjusting the spacing between the armature and the core assembly.
  • circuit interrupter protective device of claim 6 in which a calibrating screw is mounted on the bracket and the means for adjusting the spacing comprises an adjustable knob haivng a cam surface engaging the calibrating screw to effect movement of the lever to a desired position.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Manufacture Of Motors, Generators (AREA)
US00346230A 1973-03-29 1973-03-29 Circuit interrupter protective device Expired - Lifetime US3797007A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34623073A 1973-03-29 1973-03-29

Publications (1)

Publication Number Publication Date
US3797007A true US3797007A (en) 1974-03-12

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US00346230A Expired - Lifetime US3797007A (en) 1973-03-29 1973-03-29 Circuit interrupter protective device

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US (1) US3797007A (es)
JP (2) JPS50121204U (es)
AR (1) AR211908A1 (es)
BE (1) BE813004A (es)
BR (1) BR7402531D0 (es)
CA (1) CA998079A (es)
DE (2) DE7410687U (es)
ES (1) ES424715A1 (es)
FR (1) FR2223823B1 (es)
GB (1) GB1461491A (es)
IT (1) IT1069260B (es)
ZA (1) ZA741806B (es)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074218A (en) * 1976-05-07 1978-02-14 Westinghouse Electric Corporation Circuit breaker
US4118680A (en) * 1977-02-07 1978-10-03 Westinghouse Electric Corp. Circuit interrupter
US4313098A (en) * 1980-01-16 1982-01-26 Westinghouse Electric Corp. Circuit interrupter trip unit
US4691182A (en) * 1986-04-30 1987-09-01 Westinghouse Electric Corp. Circuit breaker with adjustable magnetic trip unit
US4698606A (en) * 1986-06-20 1987-10-06 Westinghouse Electric Corp. Circuit breaker with adjustable thermal trip unit
EP0242538A1 (de) * 1986-03-20 1987-10-28 Sprecher + Schuh AG Umstellvorrichtung für einen elektrischen Schalter
US4713635A (en) * 1986-07-01 1987-12-15 Westinghouse Electric Corp. Multi-phase circuit breaker with interphase barrier retention
US5119054A (en) * 1990-08-30 1992-06-02 Westinghouse Electric Corp. "E" frame pancake design
JPH0815037B2 (ja) 1986-09-30 1996-02-14 イートン コーポレイション 回路遮断器
US20050062568A1 (en) * 2003-09-24 2005-03-24 Navin Kumar Apparatus and method for circuit breaker trip unit adjustment
CN115647347A (zh) * 2022-12-28 2023-01-31 河北泰禾高温流体科技股份有限公司 一种高安全性防误碰滑动水口机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6230273Y2 (es) * 1977-03-11 1987-08-04
US4973927A (en) * 1988-10-12 1990-11-27 Westinghouse Electric Corp. Two piece cradle latch, handle barrier locking insert and cover interlock for circuit breaker

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074218A (en) * 1976-05-07 1978-02-14 Westinghouse Electric Corporation Circuit breaker
US4118680A (en) * 1977-02-07 1978-10-03 Westinghouse Electric Corp. Circuit interrupter
US4313098A (en) * 1980-01-16 1982-01-26 Westinghouse Electric Corp. Circuit interrupter trip unit
US4843196A (en) * 1986-03-20 1989-06-27 Sprecher & Schuh Ag Mode switching device for an electrical switch
EP0242538A1 (de) * 1986-03-20 1987-10-28 Sprecher + Schuh AG Umstellvorrichtung für einen elektrischen Schalter
CH669066A5 (de) * 1986-03-20 1989-02-15 Sprecher & Schuh Ag Umstellvorrichtung fuer einen elektrischen schalter.
US4691182A (en) * 1986-04-30 1987-09-01 Westinghouse Electric Corp. Circuit breaker with adjustable magnetic trip unit
EP0251569A3 (en) * 1986-06-20 1988-10-12 Eaton Corporation Circuit breaker with adjustable thermal trip unit
EP0251569A2 (en) * 1986-06-20 1988-01-07 Eaton Corporation Circuit breaker with adjustable thermal trip unit
US4698606A (en) * 1986-06-20 1987-10-06 Westinghouse Electric Corp. Circuit breaker with adjustable thermal trip unit
US4713635A (en) * 1986-07-01 1987-12-15 Westinghouse Electric Corp. Multi-phase circuit breaker with interphase barrier retention
AU596418B2 (en) * 1986-07-01 1990-05-03 Westinghouse Electric Corporation Multi-phase circuit breaker with interphase barrier retention
JPH0815037B2 (ja) 1986-09-30 1996-02-14 イートン コーポレイション 回路遮断器
US5119054A (en) * 1990-08-30 1992-06-02 Westinghouse Electric Corp. "E" frame pancake design
US20050062568A1 (en) * 2003-09-24 2005-03-24 Navin Kumar Apparatus and method for circuit breaker trip unit adjustment
US6956452B2 (en) * 2003-09-24 2005-10-18 General Electric Company Apparatus and method for circuit breaker trip unit adjustment
CN115647347A (zh) * 2022-12-28 2023-01-31 河北泰禾高温流体科技股份有限公司 一种高安全性防误碰滑动水口机构
CN115647347B (zh) * 2022-12-28 2023-03-03 河北泰禾高温流体科技股份有限公司 一种高安全性防误碰滑动水口机构

Also Published As

Publication number Publication date
JPS541023Y2 (es) 1979-01-18
JPS49149972U (es) 1974-12-25
DE2414723A1 (de) 1974-10-10
AU6716074A (en) 1975-10-02
BE813004A (fr) 1974-09-30
DE7410687U (de) 1974-07-18
GB1461491A (en) 1977-01-13
AR211908A1 (es) 1978-04-14
CA998079A (en) 1976-10-05
JPS50121204U (es) 1975-10-03
IT1069260B (it) 1985-03-25
FR2223823A1 (es) 1974-10-25
ES424715A1 (es) 1976-06-01
BR7402531D0 (pt) 1974-11-19
ZA741806B (en) 1975-02-26
FR2223823B1 (es) 1980-03-28

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