US3792216A - Anti blow-off means for circuit breaker contacts - Google Patents

Anti blow-off means for circuit breaker contacts Download PDF

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Publication number
US3792216A
US3792216A US00275522A US3792216DA US3792216A US 3792216 A US3792216 A US 3792216A US 00275522 A US00275522 A US 00275522A US 3792216D A US3792216D A US 3792216DA US 3792216 A US3792216 A US 3792216A
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Prior art keywords
contact means
arcing
carrier
main contact
stationary portion
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US00275522A
Inventor
C Gryctko
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Siemens Energy and Automation Inc
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ITE Imperial Corp
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Assigned to SIEMENS-ALLIS, INC., A DE CORP. reassignment SIEMENS-ALLIS, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GOULD, INC., A DE CORP., ITE INDUSTRIES, LIMITED, A FEDERAL CORP. OF CANADA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H9/383—Arcing contact pivots relative to the movable contact assembly
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force

Definitions

  • Molded case circuit breakers of very high current rating are provided with one or more movable main contacts for carrying current on a continuous basis and a movable arcing contact for current interruption.
  • the arcing and main contacts are mounted to the same carrier in a manner to produce a contact operation sequence in which the arcing contacts close before the main contacts when the circuit breaker is being closed and the main contacts separate before the arcing contacts when the circuit breaker is being opened.
  • very high blowoff forces are present, with the result that intended contact opening and closing sequences may be upset. That is, severe blowoff forces may cause separation of the arcing contacts prior to separation of the main contacts, in which event circuit interruption may be initiated at the main contacts, thereby causing excessive pitting thereof.
  • an adjustable stop mounted to the contact carrier is adjusted, after closing of the contacts, to a position which limits movement of the arcing contact toward the contact carrier to the relative positions occupied by these elements when the contacts are closed.
  • the arcing contacts may not open until the contact carrier begins to move toward open circuit position.
  • additional stops are provided to prevent open circuit movement of both the arcing and main contacts prior to movement of the contact carrier toward-open circuit position.
  • all of the main contacts are connected to the arcing contact by levers so constructed that movement of a main contact toward open circuit position relative to the contact carrier exerts a force tending to close the arcing contact.
  • a primary object of the instant invention is to provide novel means for protecting circuit breaker contacts against pitting.
  • Another object is to provide a contact carrier bridge with adjustable stop means settable to engage the movable arcing contacts and limit movement thereof toward the contact bridge.
  • Still another object is to provide a plurality of adjustable stops on the contact carrier, engageable with the main arcing contacts to limit movement of these contacts towards the contact bridge to the relative positions occupied thereby with the circuit breaker closed.
  • FIG. 1 is a longitudinal section, taken through line 1-l of FIG. 2, showing a circuit breaker contact mechanism, including anti-blowoff adjusting means constructed in accordance with the instant invention.
  • FIG. 2 is a plan view of the contact bridge, looking in the direction of arrows 2-2 of FIG. 1.
  • FIG. 3 is a view similar to FIG. 1 showing a fragmentary portion of a contact mechanism provided with another embodiment of a stop means constructed in accordance with the instant invention.
  • FIG. 4 is an end view, looking in the direction of arrows 44 of FIG. 3, showing the contacts and antiblowoff lever mechanism.
  • FIG. 5 is a view similar to FIG. 1, showing still another embodiment of the instant invention.
  • FIG. 6 is an end view looking in the direction of arrows 66 of FIG. 5, showing the contacts and antiblowoff means.
  • FIG. 7 is a plan view, looking in the direction of arrows 77 of FIG. 5, showing the contact carrier bridge and the anti-blowoff elements mounted thereto.
  • Contact carrier bridge 10 is generally of inverted U- shape and is provided with rearwardly extending arms 11 pivotally connected at bushing 12 to the frame (not shown) of spring powered overcenter toggle-type operating mechanism 14.
  • Mechanism 14 is connected to shaft 15 whose ends are supported by carrier arms 11.
  • Shaft 15 provides the pivot for arcing contact arm 21 and a plurality of arms 22 for front main contacts 25.
  • Another shaft 16, whose ends are supported by carrier arms 11, provides a pivot for the plurality of arms 23 for rear main contacts 26.
  • coiled compression springs 31 extending through the open bottom of tubular housing 32 on carrier 10 biases movable arcing contact 24 into engagement with stationary arcing contact 27.
  • Individual coiled compression springs 34 extending through the bottoms of individual tubular members 35 mounted to carrier 10 bias each of the front movable main contacts 25 into engagement with stationary main contacts 28.
  • Two inverted U-shaped auxiliary contact carriers 36 are disposed with their arms extending downward through apertures 41, 42, 43 of contact carrier 10 to support a pair of contact arms 23 on an individual stub shaft 44 for each pair of contact arms 23.
  • Individual coiled compression springs 45 bias each of the auxiliary carriers 36 downward with respect to contact carrier 10.
  • a pair of anti-blowoff adjusting screws 47 are threadably mounted to support strip 48, with the lower ends of stop screws 47 engaging the upper edge of arcing contact arm 21 when contact carrier 10 is in the closed circuit position shown in FIG. 1.
  • the body portions of screws 47 extend through contact carrier aperture 42, with support strip 48 bridging aperture 42 and the heads of screws 47 being accessible from above contact carrier 10.
  • stop screws 47 prevents blowoff forces from separating arcing contacts 24, 27 unless contact carrier 10 is also moving toward its open circuit position.
  • FIGS. 3 and 4 do not show the springs provided for biasing arcing contact arms 51 and main contact arms 52, 53 downward with respect to contact carrier 54.
  • Carrier 54 is provided with downwardly extending centrally located ear 56 supporting stub shaft 55 which pivotally mounts four levers 61, 63, 62. 64, at points intermediate the ends thereof.
  • the end of the longer arms of each of the levers 61-64 engagesthe upper end of an individual main contact arm 52, and the end of the shorter arm of each of the levers 61-64 engages the upper edge of arcing contact arm 51.
  • any tendency of main contact arms 52 to move upward relative to carrier 54 is transmitted through levers 61-64 to urge arcing contact 51 downward, and the reaction force to this downward force acting on arcing contact 51 exerts an upward force on contact carrier 54.
  • adjustable stop 71 threadably mounted to contact carrier 70, engages the upper edge of arcing contact arm 72 to serve the same function as stop screws 47 of FIGS. 1 and 2.
  • Contact carrier 70 also threadably mounts inverted stop screws 74a, 74b.
  • the head of stop screw 74a is seated against the upper edges of main contact arms 73a, 73b, and in a similar manner the head of stop screw 74b is seated against the upper edges of main contact arm 73c and 73d.
  • Circuit breaker contact means including a stationary portion and a movable portion operable into and out of engagement with said stationary portion; said movable portion including arcing contact means and main contact means; carrier means to which said arcing and main contact means are mounted for independent relative movement with respect thereto and bodily movement therewith; biasing means urging said arcing and main contact means away from said carrier means and toward said stationary portion; means to limit relative movement of said arcing and main contact means from the stationary portion; stop means to prevent movement of said arcing contact means away from said stationary portion before movement of said carrier means from said closed circuit position toward said open circuit position.
  • Circuit breaker means as set forth in claim 1 in which there is an adjustable stop means to limit movement of said main contact means toward said carrier means to the relative positions of said main contact means and said carrier means at a time when the latter is in said closed circuit position and the main contact means is engaged with the stationary portion.
  • a circuit breaker as set forth in claim 1 in which the arcing and main contact means are pivotally mounted on the contact carrier, with said arcing contact means being interposed between portions of said main contact means.
  • a circuit breaker as set forth in claim 1 in which the stop means'is adjustable and is set to limit movement of said arcing contact means toward said carrier means to the relative positions of said arcing contact means and said carrier means at a time when the latter is in said closed circuit position and the arcing contact means is engaged with the stationary portion.
  • Circuit breaker means as set forth in claim 4 in which there is an adjustable stop means to limit movement of said main contact means toward said carrier means to the relative positions of said main contact means and said carrier means at a time when the latter is in said closed circuit position and the main contact means is engaged with the stationary portion.
  • stop means includes levers connected between said arcing contact means and said main contact means;

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  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

The movable contact structure of a very high current capacity molded case circuit breaker is provided with means to prevent blowoff forces from opening the arcing contact prior to opening movement of the contact carrier.

Description

United States Patent Gryctko Feb. 12, 1974 [54] ANTI BLOW-OFF MEANS FOR CIRCUIT 3,158,720 11/1964 Wiktor 200/!46 R BREAKER CONTACTS 3,513,275 5/1970 Cellerini et a]. 200/146 R [75] Inventor: Carl E. Gryctko, Haddon Heights,
NJ. Primary ExaminerRobert S. Macon Assign: Imperial Corporation Attorney, Agent, or firm-Ostrolenk, Faber, Gerb &
Philadelphia, Pa. Soffen [22] Filed: July 27, 1972 [21] Appl. No.: 275,522
[ ABSTRACT 52 US. Cl 200/146 R The movable Contact Structure f a very high current [51] Int. Cl. H0lh 33/12 capacity molded case circuit breaker is provided with [58] F'eld of Search 200/146 144 147 R means to prevent blowoff forces from opening the arcing contact prior to opening movement of the contact [56] References Cited carrier UNITED STATES PATENTS 3,076,882 2/l963 Judd et al. 200/146 R 7 Claims, 7 Drawing Figures l I M Z SPZ/AfPO/dffiffl Z I t auae Cf/ZZ} 1 1 70 15-)" Z/ /d\ 0/ r/wma/z 1 N W6 ll 3 J 47 l I I II o I 4' I O i I/ t 9 I 2g 27 2 29 M Z5 25 "All ANTI BLOW-OF F MEANS FOR CIRCUIT BREAKER CONTACTS This invention relates to high current molded case circuit breakersin general and more particularly relates to an anti-blowoff adjustment for the movable contacts thereof.
Molded case circuit breakers of very high current rating are provided with one or more movable main contacts for carrying current on a continuous basis and a movable arcing contact for current interruption. Typically, the arcing and main contacts are mounted to the same carrier in a manner to produce a contact operation sequence in which the arcing contacts close before the main contacts when the circuit breaker is being closed and the main contacts separate before the arcing contacts when the circuit breaker is being opened. However, when extremely high currents are being interrupted, very high blowoff forces are present, with the result that intended contact opening and closing sequences may be upset. That is, severe blowoff forces may cause separation of the arcing contacts prior to separation of the main contacts, in which event circuit interruption may be initiated at the main contacts, thereby causing excessive pitting thereof. This out-ofnormal sequence contact separation is most likely to happen when the contact carrier is in closed circuit position and with the toggle of the contact operating mechanism just passing over center in the opening direction, at which time contact pressure forces usually supplied by the'mechanism operating springs are relaxed so that the contact carrier is effectively floating.
In accordance with the instant invention, an adjustable stop mounted to the contact carrier is adjusted, after closing of the contacts, to a position which limits movement of the arcing contact toward the contact carrier to the relative positions occupied by these elements when the contacts are closed. Thus, the arcing contacts may not open until the contact carrier begins to move toward open circuit position.
In another embodiment of this invention, additional stops are provided to prevent open circuit movement of both the arcing and main contacts prior to movement of the contact carrier toward-open circuit position. In still another embodiment of this invention all of the main contacts are connected to the arcing contact by levers so constructed that movement of a main contact toward open circuit position relative to the contact carrier exerts a force tending to close the arcing contact.
Accordingly, a primary object of the instant invention is to provide novel means for protecting circuit breaker contacts against pitting.
Another object is to provide a contact carrier bridge with adjustable stop means settable to engage the movable arcing contacts and limit movement thereof toward the contact bridge.
Still another object is to provide a plurality of adjustable stops on the contact carrier, engageable with the main arcing contacts to limit movement of these contacts towards the contact bridge to the relative positions occupied thereby with the circuit breaker closed.
These objects as well as other objects of this invention will become readily apparent after reading the following description of the accompanying drawings in which:
FIG. 1 is a longitudinal section, taken through line 1-l of FIG. 2, showing a circuit breaker contact mechanism, including anti-blowoff adjusting means constructed in accordance with the instant invention.
FIG. 2 is a plan view of the contact bridge, looking in the direction of arrows 2-2 of FIG. 1.
FIG. 3 is a view similar to FIG. 1 showing a fragmentary portion of a contact mechanism provided with another embodiment of a stop means constructed in accordance with the instant invention.
FIG. 4 is an end view, looking in the direction of arrows 44 of FIG. 3, showing the contacts and antiblowoff lever mechanism.
FIG. 5 is a view similar to FIG. 1, showing still another embodiment of the instant invention.
FIG. 6 is an end view looking in the direction of arrows 66 of FIG. 5, showing the contacts and antiblowoff means.
FIG. 7 is a plan view, looking in the direction of arrows 77 of FIG. 5, showing the contact carrier bridge and the anti-blowoff elements mounted thereto.
Now referring more particularly to FIGS. 1 and 2. Contact carrier bridge 10 is generally of inverted U- shape and is provided with rearwardly extending arms 11 pivotally connected at bushing 12 to the frame (not shown) of spring powered overcenter toggle-type operating mechanism 14. Mechanism 14 is connected to shaft 15 whose ends are supported by carrier arms 11. Shaft 15 provides the pivot for arcing contact arm 21 and a plurality of arms 22 for front main contacts 25. Another shaft 16, whose ends are supported by carrier arms 11, provides a pivot for the plurality of arms 23 for rear main contacts 26.
In the closed position of contact carrier 10, illustrated in FIG. 1, coiled compression springs 31 extending through the open bottom of tubular housing 32 on carrier 10 biases movable arcing contact 24 into engagement with stationary arcing contact 27. Individual coiled compression springs 34 extending through the bottoms of individual tubular members 35 mounted to carrier 10 bias each of the front movable main contacts 25 into engagement with stationary main contacts 28. Two inverted U-shaped auxiliary contact carriers 36 are disposed with their arms extending downward through apertures 41, 42, 43 of contact carrier 10 to support a pair of contact arms 23 on an individual stub shaft 44 for each pair of contact arms 23. Individual coiled compression springs 45 bias each of the auxiliary carriers 36 downward with respect to contact carrier 10.
A pair of anti-blowoff adjusting screws 47 are threadably mounted to support strip 48, with the lower ends of stop screws 47 engaging the upper edge of arcing contact arm 21 when contact carrier 10 is in the closed circuit position shown in FIG. 1. The body portions of screws 47 extend through contact carrier aperture 42, with support strip 48 bridging aperture 42 and the heads of screws 47 being accessible from above contact carrier 10. The presence of stop screws 47,adjusted as shown in FIG. 1, prevents blowoff forces from separating arcing contacts 24, 27 unless contact carrier 10 is also moving toward its open circuit position.
For the emodiment of FIGS. 3 and 4, the drawings do not show the springs provided for biasing arcing contact arms 51 and main contact arms 52, 53 downward with respect to contact carrier 54. Carrier 54 is provided with downwardly extending centrally located ear 56 supporting stub shaft 55 which pivotally mounts four levers 61, 63, 62. 64, at points intermediate the ends thereof. The end of the longer arms of each of the levers 61-64 engagesthe upper end of an individual main contact arm 52, and the end of the shorter arm of each of the levers 61-64 engages the upper edge of arcing contact arm 51. Thus, any tendency of main contact arms 52 to move upward relative to carrier 54 is transmitted through levers 61-64 to urge arcing contact 51 downward, and the reaction force to this downward force acting on arcing contact 51 exerts an upward force on contact carrier 54.
In the embodiment of FIGS. -7, adjustable stop 71 threadably mounted to contact carrier 70, engages the upper edge of arcing contact arm 72 to serve the same function as stop screws 47 of FIGS. 1 and 2. Contact carrier 70 also threadably mounts inverted stop screws 74a, 74b. The head of stop screw 74a is seated against the upper edges of main contact arms 73a, 73b, and in a similar manner the head of stop screw 74b is seated against the upper edges of main contact arm 73c and 73d. Thus, blowoff forces acting to separate arcing contacts 76, 77 and/or any of the pairs of main contacts 78, 79 exert forces that are transmitted directly to contact carrier 70 and urge upward movement thereof to a circuit open position.
For those features of construction in circuit breaker that have not been described in detail herein, reference is made to one or more of the copending applications Ser. Nos. 275,568, 275,577, 275,446, 275,578, 275,454, 275,508, 275,621, 275,623, 275,569, 275,569, 275,521, 275,523, and 275,622, all filed on even date herewith and all assigned to the assignee of the instant invention.
Although there have been described preferred embodiments of this novel invention, many variations and modifications will now become apparent to those skilled in the art. Therefore, this invention is to be limited not by the specific disclosure herein but only by the appending claims.
The embodiments of the invention in which an exclusive privilege or property is claimed are defined as follows.
1. Circuit breaker contact means including a stationary portion and a movable portion operable into and out of engagement with said stationary portion; said movable portion including arcing contact means and main contact means; carrier means to which said arcing and main contact means are mounted for independent relative movement with respect thereto and bodily movement therewith; biasing means urging said arcing and main contact means away from said carrier means and toward said stationary portion; means to limit relative movement of said arcing and main contact means from the stationary portion; stop means to prevent movement of said arcing contact means away from said stationary portion before movement of said carrier means from said closed circuit position toward said open circuit position.
2. Circuit breaker means as set forth in claim 1 in which there is an adjustable stop means to limit movement of said main contact means toward said carrier means to the relative positions of said main contact means and said carrier means at a time when the latter is in said closed circuit position and the main contact means is engaged with the stationary portion.
3. A circuit breaker as set forth in claim 1 in which the arcing and main contact means are pivotally mounted on the contact carrier, with said arcing contact means being interposed between portions of said main contact means.
4. A circuit breaker as set forth in claim 1 in which the stop means'is adjustable and is set to limit movement of said arcing contact means toward said carrier means to the relative positions of said arcing contact means and said carrier means at a time when the latter is in said closed circuit position and the arcing contact means is engaged with the stationary portion.
5. Circuit breaker means as set forth in claim 4 in which there is an adjustable stop means to limit movement of said main contact means toward said carrier means to the relative positions of said main contact means and said carrier means at a time when the latter is in said closed circuit position and the main contact means is engaged with the stationary portion.
6. A circuit breaker as set forth in claim 1 in which the stop means includes levers connected between said arcing contact means and said main contact means;
forces to said arcing contact means than are applied to 7 said movable contact means.

Claims (7)

1. Circuit breaker contact means including a stationary portion and a movable portion operable into and out of engagement with said stationary portion; said movable portion including arcing contact means and main contact means; carrier means to which said arcing and main contact means are mounted for independent relative movement with respect thereto and bodily movement therewith; biasing means urging said arcing and main contact means away from said carrier means and toward said stationary portion; means to limit relative movement of said arcing and main contact means toward said stationary portion when said carrier means is in an open circuit position; said contact means being mounted to said carrier means in a manner such that under normal operating conditions, as saId carrier means moves toward said stationary portion to a closed circuit position, said arcing contact means will engage said stationary portion prior to engagement of the latter by said main contact means, and as said carrier means moves from closed to open circuit position said main contact means will separate from said stationary portion prior to separation of the arcing contact means from the stationary portion; stop means to prevent movement of said arcing contact means away from said stationary portion before movement of said carrier means from said closed circuit position toward said open circuit position.
2. Circuit breaker means as set forth in claim 1 in which there is an adjustable stop means to limit movement of said main contact means toward said carrier means to the relative positions of said main contact means and said carrier means at a time when the latter is in said closed circuit position and the main contact means is engaged with the stationary portion.
3. A circuit breaker as set forth in claim 1 in which the arcing and main contact means are pivotally mounted on the contact carrier, with said arcing contact means being interposed between portions of said main contact means.
4. A circuit breaker as set forth in claim 1 in which the stop means is adjustable and is set to limit movement of said arcing contact means toward said carrier means to the relative positions of said arcing contact means and said carrier means at a time when the latter is in said closed circuit position and the arcing contact means is engaged with the stationary portion.
5. Circuit breaker means as set forth in claim 4 in which there is an adjustable stop Means to limit movement of said main contact means toward said carrier means to the relative positions of said main contact means and said carrier means at a time when the latter is in said closed circuit position and the main contact means is engaged with the stationary portion.
6. A circuit breaker as set forth in claim 1 in which the stop means includes levers connected between said arcing contact means and said main contact means; said levers being mounted so that forces moving said main contact means toward said carrier means exert forces on said arcing contact means urging the latter away from said carrier means.
7. A circuit breaker as set forth in claim 6 in which the levers are mounted and positioned to apply greater forces to said arcing contact means than are applied to said movable contact means.
US00275522A 1972-07-27 1972-07-27 Anti blow-off means for circuit breaker contacts Expired - Lifetime US3792216A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580115A1 (en) * 1985-04-09 1986-10-10 Merlin Gerin Electrical circuit breaker with wear compensation device
WO1992018853A1 (en) * 1991-04-12 1992-10-29 Canter, Karl, F. Imaging beta tracer microscope
US11562867B2 (en) * 2019-01-15 2023-01-24 Jianping Zhao Movable contact mechanism of double-breakpoint circuit breaker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076882A (en) * 1957-08-22 1963-02-05 Gen Electric Electric circuit breaker
US3158720A (en) * 1961-02-17 1964-11-24 Fed Pacific Electric Co Contact assembly having hinge means utilizing electrodynamic forces of current flow therethrough
US3513275A (en) * 1966-04-14 1970-05-19 Westinghouse Electric Corp Circuit breaker with improved current path and contact means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076882A (en) * 1957-08-22 1963-02-05 Gen Electric Electric circuit breaker
US3158720A (en) * 1961-02-17 1964-11-24 Fed Pacific Electric Co Contact assembly having hinge means utilizing electrodynamic forces of current flow therethrough
US3513275A (en) * 1966-04-14 1970-05-19 Westinghouse Electric Corp Circuit breaker with improved current path and contact means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580115A1 (en) * 1985-04-09 1986-10-10 Merlin Gerin Electrical circuit breaker with wear compensation device
WO1992018853A1 (en) * 1991-04-12 1992-10-29 Canter, Karl, F. Imaging beta tracer microscope
US11562867B2 (en) * 2019-01-15 2023-01-24 Jianping Zhao Movable contact mechanism of double-breakpoint circuit breaker

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AS Assignment

Owner name: SIEMENS-ALLIS, INC., A DE CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:GOULD, INC., A DE CORP.;ITE INDUSTRIES, LIMITED, A FEDERAL CORP. OF CANADA;REEL/FRAME:004226/0657

Effective date: 19830131