US2083508A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US2083508A
US2083508A US27175A US2717535A US2083508A US 2083508 A US2083508 A US 2083508A US 27175 A US27175 A US 27175A US 2717535 A US2717535 A US 2717535A US 2083508 A US2083508 A US 2083508A
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United States
Prior art keywords
plate
plunger
spring
circuit
contact
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Expired - Lifetime
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US27175A
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English (en)
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Schmidt Lambert
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Individual
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Individual
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Priority to BE415118D priority Critical patent/BE415118A/xx
Application filed by Individual filed Critical Individual
Priority to US27176A priority patent/US2083509A/en
Priority to US27175A priority patent/US2083508A/en
Priority to GB8691/36A priority patent/GB472496A/en
Priority to FR806032D priority patent/FR806032A/fr
Application granted granted Critical
Publication of US2083508A publication Critical patent/US2083508A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • This invention relates to circuit breakers, and more particularly circuit breakers of the Edison plug type, and has for its object the provision of a circuit breaker which may readily act by thermostatic means, or by manual means to break the circuit.
  • the central switch rod passes through a plate having an opening of substantially the diameter of the switch rod, which plate is inclined to the axis of the switch rod and then locks against the plate edge, and holds the switch rod in circuit-closed position.
  • the thermostatic control is arranged to surround the switch rod and performs the function of frictionally holding the switch rod, but upon the current exceeding a normal amount, then releasing the switch rod.
  • This thermostatic control acting in this double capacity can be arranged to act on the switch rod along any portion of the same.
  • the principle of the invention consists in looking the central switch rod in circuit closed position, by a means surrounding the same, and then moving said locking means in respect to said rod,
  • the parts are assembled in a very compact manner and thus may be readily utilized in a standard cut-out.
  • the button in certain embodiments may be suitably colored to show circuit on or circuit ofi positions.
  • An object of the invention accordingly, is to provide a circuit breaker in which the thermal responsive element is a part of the electric cir-' cuit of the device and also constitutes a mechanical clutch mechanism.
  • a further object of the invention is to provide,
  • a further object of the invention is to pro vide a circuit breaker of the above character wherein the thermal element is formedof bimetal and functions not only as one of the breaker contacts, but also as a clutch by means of which 1935, Serial No. 27,175
  • the breaker contacts may be maintained in a closed position.
  • a further object of the invention is to provide, in combination with a circuit breaker of the type above mentioned, shunt mechanism which is mounted on the bottom terminal member.
  • a further object of the invention is to provide, in a circuit breaker of the above character,- an improved contact member by means of which maximum area of contact between the relatively movable contact members may be preserved during the circuit making and breaking operations.
  • Figure 1 is a side view of the more important elements of the embodiment shown in the later views, certain operative elements being omitted for the sake of clarity; v
  • Figure 2 is a plan view taken on the line 2-2 of Figure 3;
  • Figure 3 is a sectional view partly in side elevation taken on the line 3--3 of Figure 2, and showing the parts in unlocked position, and with the circuit broken;
  • Figure 4 is a similar view showing the parts in locked position and the circuit closed;
  • Figure 5 is a similar view showing the parts in position whereby to be operated by manual means
  • Figure 6 is a side view partly in section taken on the line 6-6 of Figure 4;
  • Figure 'I is a sectional view of a modified form of the invention, being taken on line 1-1 of Figure 8, in which the switch rod has a collar engaging the locking plate, and the thermostatic control is placed beneath the plate;
  • Figure 8 is a plan view of the same, taken on line 8-8 of Figure 7
  • Figure 9 is a plan view of the contact spring
  • FIG 10 is a sectional view of another embodiment in which the thermostatic control acts to hold the switch rod, taken on line. lfl--l
  • Figure 11 is a'pla'n view of the same, taken on line ll-H of Figure 12;
  • ' Figure 12 is a sectional view of another embodiment'in which the thermostatic control acts to hold the switch rod and also acts as a contact switch to the end of the switch rod;
  • Figure 13 is a sectional view of the same embodiment as shown in Figure 12, but taken at 5 right'angles thereto on line I3-I3 of Figure 12;
  • Figure 14 is a detail sectional view of the lower part of Figure 12, with the parts in a different position, just as current interruption is taking place;
  • Figure 15 is a sectional plan view taken on line I5--I5 of Figure 12;
  • Figure 16 is a sectional plan view taken on line l6-I6 of Figure 12.
  • Figure 1'? is a plan view of the contact plate.
  • the usual threaded plug is indicated by III which has a contact member II at its lower portion and a spring member 32 connected with this lower contact piece II.
  • These parts 20 are well known.
  • a plate I I To the screw-threaded plug I0 is secured a plate I I and this is seated within a casing I2, having a sleeve guide I3 through which a button I4 is adapted to pass.
  • This button I4 is movable by the pressure of a hand into the casing I2 and may be held therein. When such holding is released, the button II under the action of a spring again moves outwardly of the casing along sleeve I3.
  • the button I4 has a cylindrical portion I9 and this passes through 30 a circular opening I9 of the plate I5, which is held to the circular plate I! by means of screws I6.
  • This plate is normally in inclined position in respect to the plate I! and may be pressed downwardly into a position substantially parallel with the plate I1, and when in this approximate position, the cylindrical member I9 may freely pass into andout of the circular opening l8 of the plate I5.
  • the plate I5 takes an angular position with respect to the cylindrical member I9, then the inner edge of the plate I 5, which edge is formed by the circular opening I9, and particularly the uppermost portion at one side of the circular opening and at the lowermost portion of the opening at the side opposite to the uppermost portion, the part indicated by the leading line in Figures 3 and 4 of the reference character I9, engages with the peripheral portion of the cylindrical member I9, and locks the cylindrical member I9, and in consequence, the button I4, in a position within the casing I2.
  • the button I4 is pressed inwardly as far as it will go, as shown in Figure 1, the contact piece 3
  • the upper surface of the casing I2 is provided with a plunger member having a base portion 20 which engages, by
  • This member 20 has a central bore, and therein is arranged a spring-controlled piston member 22, suitably spring actuated, so as to cause the plunger member 22 to return to its initial position.
  • plunger 22 When the plunger member 22 is pressed downwardly, as shown in Figure 5, by the finger, plunger 22 engages the plate I5 and presses the plate [5 downwardly, and thereby disengages the edge of the plate I5 from the cylindrical portion I9; thereby the button I4 under the actuation of the spring 35 is forced upwardly or out of the casing I2, as shown in the position of Figure 5.
  • This'same release action may also be obtained by means of a thermostatic device. This therpushed down.
  • mostatic device consists of an upright member or post 23. To this post there is attached a horseshoe-like bi-metallic member of suitable current resisting qualities having its free end 25 closely approaching the plate I5, when the plate I5 is in locked position, as shown in Figure 4.
  • An insulating plate I5 is provided on the end of plate I5 to prevent electrical connection between the element 24 and plate I5.
  • the electrical circuit in which this horseshoe member 24 is inserted is shown by the wire 39 which has one end connected at 25 with the member 24 and the other end connected to the exterior metallic conductor of which the screw-threaded portion I0 is one part.
  • the completed circuit includes shell ID as one terminal to which wire 39 is connected, bimetal element 24 to which the other end of wire 39 is connected, post 23, plate I'l, shaft 30, contact piece 3
  • the thermostatic device becomes actuated and moves the plate I5 in case the plate I5 is in locked position, and then moves it from the locked position to the unlocked position, and disengages the plate I5 from the portion I9, thereby moving the button I4 upwardly, breaking the contact between iii and 32.
  • My device forms a very convenient and simple mechanism which may be readily inserted in a standard cut-out. It is always ready for actuation, no part burning out, requiring the looking for spare parts, as it is self contained and always operative after beinginserted.
  • an engagement of the peripheral part of the member I9 with the edge of I 9 of the plate I5 takes place and holds the part I9 in position, and thereby the button in its inward position, corresponding to the closing of the circuit.
  • circuit breaker The size and dimensions of the circuit breaker are such that can be used in the existing cutouts, in place of fuses, without any alteration in the present installations.
  • circuit breakers can be made in all sizes, from flve to thirty amperes the same as well-known fuses, without any change in mechanism, with the exception that in the larger amperage, a thermostat is made more resistantand can readily be arranged in accordance with the amperage desired.
  • the simplicity of the circuit breaker enables it to be marketed at a nominal figure. It consists of a round brass disc through which a plunger projects. To the upper end of the plunger, a push button is fastened. To the lower end of the plunger, a brass disc is fastened.
  • This brass disc makes contact with the contact spring 32 in the lower part of the casing, when the plunger I9 is The plunger is pushed through an opening in a plate steel spring I5, which is bent at an angle to the round disc I I on which it is supported. When the plunger is pushed down, it bends the spring plate I5 downwardly and allows the plunger to pass through the hole of the plate spring without hindrance, but as soon as the finger is released from the push button l4, the plate spring or platform comes back in its original position, which is at an angle to the brass disc H, and thereby arrests the plunger l9 so it stays in the position it has been placed.
  • the thermostat acts inv a neutral manner when normal current passes through; and then remains in its original position.
  • the thermostat opens up until it presses on the plate spring or platform, and it eventually depresses the plate spring or platform sufllciently to allow the plunger to pass through the hole and thereby it disconnects contact between the spring and the brass disc in the bottom of the circuit breaker providing an arc gap of about ⁇ a of an inch.
  • the coil spring 35 around the plunger 30 returns the plunger very quickly, thereby minimizing arcing.
  • the improved circuit breaker herein described overcomes the objections of the old fuses, as an arrangement has been made for a time-lag of an overload and an immediate disconnection on a short circuit.
  • the small button or piston plunger 22 hereinbefore described disengages the spring platform I5 mechanically whenever it should become necessary to open the circuit without removing the circuit breaker from the cutout.
  • the spring 35 surrounds the sub-calibre stem 3
  • the switch rod 50 has a. collar 5
  • a helical spring 56 is interposed between the collar 5
  • the plate is limited in its movement by the adjustable nut 58 on a screw-threaded stud 59 secured to the base 55.
  • a release pin 60 may be pressed against the plate 53 to release it.
  • thermostatic control To the lower side of the plate the thermostatic control is placed, which is in the form of a plate 6
  • is of general horseshoe shape and is secured to base plate 63 by means of rivets 6
  • is provided with a slot 6
  • the lower end of the switch rod 50 through its enlargement 51, contacts with the serpentine spring contact 65, secured to the exterior contact 66, and when in contact the circuit is closed.
  • the thermostatic control serves an additional function.
  • the control acts at the same time as a locking member for the switch rod which is slidably received in a guide 54'.
  • the switch rod 50 has an insulating collar 5
  • the control is in the form of a collar 10 surrounding the collar 5
  • This control collar i is composed of two different thermo metals and has one end secured to the fixed abutment 12, secured to the base 13, and has the other and free end 74, normally supported on a wiper i5.
  • the control collar I0 is so arranged that it provides a frictional hold on the collar of the switch rod 50, when the switch rod collar 5
  • the collar 70 opens and permits the switch rod collar 5
  • the path of current through the device shown in Figures 10 and 11 extends from the shell H to the bracket 12 which is electrically connected thereto, thermal element 10, contact 15, plate 63, shaft 50, contact member 51, and breaker terminal not illustrated but corresponding to the central terminal in the device shown in Figure 7.
  • FIG. 12 to 17 still another embodiment is shown.
  • the control collar now performs still an additional function, namely, it acts as a contact member.
  • the switch rod 5t! has at its lowermost end the collar 5
  • the thermostatic control is now electrically connected with the contact 66.
  • the control consists of two like parts, having ends 88 joined together, by an adjustable screw 8
  • the curved portions 82 are so shaped as to embrace the collar 5
  • thermostatic control engages the plunger, it acts as a spring plate.
  • control is essentially a spring plate to lock or clutch the plunger, and thecontrol acts on this spring plate to release the plunger.
  • switch rod consists of two parts, the upper part 58, operated by the push button 90, which when pressed moves the rod 50 downwardly.
  • the lower end of rod 5! is screw-threaded into the collar 5
  • is placed the bent end 9
  • the rod 50 passes through a cup-shaped portion 64 of the plate 63, which plate 63 has an opening 93 for the free passage of the rod 86.
  • the plate 63 isnow bent downwards to form screw threads in the form of two diametrically opposed bars 95. Spaces 96 are left open to form vent holes for any gases.
  • the plate 66 seats against a shoulder H.
  • the insulated wedge member 84 is pressed by the elbow lever I03 into the space between the free ends 83 of the control and these being separated, remove their frictional contact with the collar Bi and release it, to enable it to act under the action of the spring 56.
  • the elbow lever I03 pivoted at I06 may be actuated by the push button I94. Ears "15 are punched out from the plate 63 to act as trunnions for the pivot pin I06.
  • a circuit breaker comprising an electric light socket plug member, a plunger in said member, a spring for acting on said plunger, a spring plate for acting directly on said plunger for holding the same in locked position, and a thermostatic member in circuit with said socket adapted to act on said spring plate when said spring plate engages the plunger, and closes the circuit, and electric connections for conducting electric current through the thermostatic member, whereby when an excess of current passes through the thermostatic member, the plunger and spring plate are disengaged and the electric circuit is broken.
  • a circuit breaker comprising an electric light socket plug member, a plunger in said member, a spring for acting on said plunger, a plate having an opening larger than the circumference of the plunger to receive the plunger, means to mount said plate at an angle to the axis of the plunger, a thermostatic member in circuit with said socket, having an end movable and disposed in operative relation to said plate, and electric connections for conducting electric current through the thermostatic member, whereby when an excess of current passes therethrough, the member moves the plate and disengages the plate from the plunger and breaks the electric circuit.
  • a circuit breaker comprising an electric light socket plug member, a plunger in said member, a spring for acting on said plunger, a plate having an opening larger than the circumference of the plunger to receive the plunger, means to mount said plate at an angle to the axis of the plunger, a thermostatic member in'circuit with said socket, having an end movable and disposed in operative relation to said plate, electric connections for conducting electric current through the thermostatic member, whereby when an excess of current passes therethrough, the member moves the plate and disengages the plate from the plunger and breaks the electric circuit, and a manual spring operated piston member in the path of the plate for moving the plate and disengaging it from the plunger.
  • a stationary contact In combination, a stationary contact, a 'reciprocating plunger, a movable contact on the plunger, a spring urging the plunger into an open position and a plate of metal normally in an obliquely inclined plunger holding position in respect to the axis of the plunger, electric connections connecting the plate in circuit with the contacts, release means engaging the plate laterally of the plunger, said plate being adapted to be pressed in one direction by the plunger, and upon the opposite movement of the plunger returning to its normal position and engaging the plunger to hold the plunger in locked position.
  • a circuit breaker comprising a socket plug having a screw threaded shell, a contact piece insulated from said shell and supported by said plug, a casing for said shell and contact piece, a plunger having a button extending outside of the casing, and a sub-calibre stem inside of the casing, a spring surrounding said sub-calibre stem and abutting the plunger, a disc having a cup for supporting the other end of the spring, a plate pivoted to saidcup disc for engaging the plunger, a thermostatic conductor for engaging said plate, and a spring actuated piston rod supported on the casing and extending exteriorly thereto for engaging said plate, whereby when the current exceeds a certain predetermined amount, the conductor moves the plate to disengage it from the plunger, and break the circuit, or the plate may be moved manually by the piston rod to break the circuit.
  • a circuit breaker comprising an electric light socket plug member, a spring actuated plunger in said member, a thermostatic control spring plate acting directly on said plunger when in contact therewith and surrounding the plunger, the thermostatic control spring plate being in circuit with said member movable by the action of an excess current to release the connection between the plunger and plate, and electric connections for conducting electric current through the plate, whereby when an excess of current passes through the plate, the plate is moved, the plunger is disengaged, and the circuit is broken.
  • a circuit breaker comprising an electric light socket plug member, a spring actuated plunger in said member, a thermostatic control spring plate acting directly on said plunger when in contact therewith and surrounding the lowermost end of the plunger and acting as a contact device, the thermostatic control spring plate being in circuit with said member movable by the action of an excess current to release the connection between the plunger and plate, and electric connections for conducting electric current through the plate, whereby when an excess of current passes through the plate, the plate is moved, and the plunger is disengaged, and the circuit is broken.
  • a circuit breaker comprising an electric light socket plug member, a spring actuated plunger in said member, a thermostatic control spring plate acting directly on said plunger when in contact therewith and surrounding the lowermost end of the plunger and acting as a contact device, a shunt stud in contact with the plate, a shunt rod on the plunger in contactwith the shunt stud, the plunger discontinuing contact with the plate, before contact between the shunt stud and shunt rod is discontinued, the thermo- 9.
  • a circuit breaker comprising an electric light socket plug member, a spring actuated plunger in said member, a thermostatic control spring plate acting directly on said plunger when in contact therewith and surrounding the lowermost end of the plunger and acting as a contact device, a shunt stud in contact with the plate, a shunt rod on the plunger in contact with the shunt stud, the plunger discontinuing contact with the plate before contact between the shunt stud and shunt rod is discontinued, an exterior release means including an exterior push button elbow lever and wedge, to operate the plate, to release it from the plunger, the thermostatic control spring plate being in circuit with said member movable by the action of an excess current to release the connection between the plunger and plate, and electric connections for-conducting electric current through the plate, whereby when an excess of current passes through the plate, the plate is moved, the plunger is disengaged, and the circuit is broken.
  • Means for breaking an electric circuit comprising a spring actuatedelement, a terminal adapted to be engaged by the element said terminal including thermostatic mechanism adapted to hold the element against the action of the spring, and electric connections for conducting electric current through the thermostatic mechanism and terminal, whereby when an excess of current passes through the member the element is released and the circuit broken.
  • Means for breaking an electric circuit comprising a spring actuated element, a terminal adapted to be engaged by the element, thermostatic mechanism on the terminal adapted to hold the element against the action of the spring, shunt connections on the terminal and element, and electric connections for conducting electric current through the thermostatic mechanism and terminal, whereby when an excess of current passes through the member the element is released andthe circuit broken said shunt connections being formed to be disconnected after the element and terminal are disconnected.
  • a circuit breaker comprising a supporting member, a spring actuated element in said member, a thermostatic member adapted to engage and hold the element frictionally with a hugging action against the action of the spring, and electric connections for conducting electric current through the thermostatic member, whereby when an excess of current passes through the member the element is released and the circuit broken.
  • a circuit breaker comprising a supporting member, a spring actuated element in said member, a thermostatically operated clutch mechanism movable by the action of an excess current to release the element, electric connections for conducting electric current through the thermostatic mechanism, whereby when an excess of current passes through the mechanism, the element is released and the circuit broken, shunt contacts across the circuit, and means to break the last named contacts subsequent to the breaking of the circuit by the element.
  • a circuit breaker comprising a supporting member, a spring actuated element in said member, a thermostatically operated clutch mechanism movable by the action of an excesscurrent to release the element, electric connections for conducting electric current through the thermostatic mechanism, whereby when an excess of current passes through the mechanism, the element is released and the circuit broken, and
  • a circuit breaker comprising a supporting member, a. spring actuated element in said member, a thermostatically operated clutch mechanism secured to the member and having a free end, the mechanism being formed to exert a wrapping frictional engagement with the element and movable by the action of an excess current to release the element, and electric connections for conducting electric current through the thermostatic mechanism, whereby when an excess of current passes through thecontrol the element is released and the circuit broken.
  • a circuit breaker comprising a supporting member, a spring actuated element in said member, a thermostatically operated clutch mechanism movable by the action of an excess current to release the element, electric connections for conducting electric current through the thermostatic mechanism, whereby when an excess of current passes through the mechanism, the element is released and the circuit broken, manually operable means for disengaging the element, shunt contacts across the circuit, and means to break the last named contacts subsequent to the breaking of the circuit by the element.
  • a circuit breaker comprising a supportin member, a spring actuated element in said member, a thermostatically operated clutch mechanism secured to the member and having a free end, the control being formed to exert a wrapping frictional engagement from the element and movable by the action of an excess current to release the element, a wiping contact member on the mechanism, and electric connections for conducting electric current through the thermostatic control, whereby when an excess of current passes through the control, the element is released and the circuit broken.

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  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
US27175A 1935-06-18 1935-06-18 Circuit breaker Expired - Lifetime US2083508A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE415118D BE415118A (enrdf_load_stackoverflow) 1935-06-18
US27176A US2083509A (en) 1935-06-18 1935-06-18 Circuit breaker
US27175A US2083508A (en) 1935-06-18 1935-06-18 Circuit breaker
GB8691/36A GB472496A (en) 1935-06-18 1936-03-23 Improvements in or relating to electric switches or circuit breakers
FR806032D FR806032A (fr) 1935-06-18 1936-04-06 Coupe-circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27175A US2083508A (en) 1935-06-18 1935-06-18 Circuit breaker

Publications (1)

Publication Number Publication Date
US2083508A true US2083508A (en) 1937-06-08

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ID=21836122

Family Applications (1)

Application Number Title Priority Date Filing Date
US27175A Expired - Lifetime US2083508A (en) 1935-06-18 1935-06-18 Circuit breaker

Country Status (4)

Country Link
US (1) US2083508A (enrdf_load_stackoverflow)
BE (1) BE415118A (enrdf_load_stackoverflow)
FR (1) FR806032A (enrdf_load_stackoverflow)
GB (1) GB472496A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542530A (en) * 1944-07-01 1951-02-20 Nat Acme Co Switch
US2688673A (en) * 1952-12-09 1954-09-07 Florence W Stephens Resettable circuit protector
US2879356A (en) * 1957-11-22 1959-03-24 John C Holmes Electric circuit breakers
US2953663A (en) * 1958-08-21 1960-09-20 Anthony B Della Fuse or circuit breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542530A (en) * 1944-07-01 1951-02-20 Nat Acme Co Switch
US2688673A (en) * 1952-12-09 1954-09-07 Florence W Stephens Resettable circuit protector
US2879356A (en) * 1957-11-22 1959-03-24 John C Holmes Electric circuit breakers
US2953663A (en) * 1958-08-21 1960-09-20 Anthony B Della Fuse or circuit breaker

Also Published As

Publication number Publication date
BE415118A (enrdf_load_stackoverflow)
FR806032A (fr) 1936-12-05
GB472496A (en) 1937-09-23

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