US472084A - Safety cut-out - Google Patents

Safety cut-out Download PDF

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US472084A
US472084A US472084DA US472084A US 472084 A US472084 A US 472084A US 472084D A US472084D A US 472084DA US 472084 A US472084 A US 472084A
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circuit
electric
safety
electro
magnet
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    • 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
    • H01H71/04—Means for indicating condition of the switching device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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  • the object of the improvement is to insure or enhance the safety of electric circuits or conductors, especially those which are used for electric lighting, railway, or power purposes.
  • This I accomplish by guarding them in such manner that a signal is given or that a change in the circuitsuch as a break, a decrease of its conductive capacity, or the substitution for the whole or a part of it of other conducting devices--is automatically effected upon the occurrence of an accident such as the breaking of a conductor of the guarded circuit or the crossing of it by another conductoror upon the occurrence of other conditions which render such change desirable, but which may not come within the term accident.
  • my invention consists in the combination, with a main circuit or circuit to be guarded, of a safety device comprising a branch circuit connected with said guarded circuit and an electro mechanical device of suitable character in a branch circuit and adapted to operate to change the guarded circuit upon a change of the currentin the latter.
  • My invention further consists in the parts and combinations thereof hereinafter particularly set forth and claimed.
  • G is the generator or source of electric energy for said circuit.
  • S is a safety device comprising a branch circuit a, connected with the main conductor A, and having therein a thermo-electricalinstrument, galvanometer, electromagnet, or other electro-mechanical device.
  • a thermo-electricalinstrument, galvanometer, electromagnet, or other electro-mechanical device In the drawing the latter is shown as an electro-magnet at M, through the helix of which the circuit Cb passes.
  • L is the armature-lever for said magnet, carrying or operating an electric contact P, adapted to engage or be separated from a contact P. These contacts are in and form the means of completing the circuit A.
  • the branch circuit a is also provided with electric contacts 1) p, which are adapted to be operated by a second electro-mechanical device, such as a magnet M and armature-lever L, the latter carrying the contact 19 and the former having its helix in the circuit A.
  • a second electro-mechanical device such as a magnet M and armature-lever L
  • the parts are arranged so that the attractive force of the magnet M will maintain a separation of the contacts pp. If now a break occur in the line A, such separation will cease, the circuit a will be completed, and magnet M energized, and the circuit A will be positively and forcibly broken at PP by the operation of said magnet and its lever L. So much of the current from circuit A may be admitted to the circuit a as is desirable, a suitable resistance or resistances being employed.
  • a safety device for electric circuits the combination, with the main circuit, of a branch circuit, an electro-mechanical device therein, electric contacts in the main circuit adapted to be operated by said electro mechanical device, contacts in the branch circuit, and an electro-mechanical device in the main circuit and adapted to control the latter contacts, substantially as set forth.

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Description

(No Model.)
M THUM SAFETY OUT-OUT.
No. 472,084. Patented Apr. 5, 1892.
I nVe/n'bor .1
Wkwnd Witnesses UNITED STATES PATENT OFFICE.
MANDEVILLE THUM, OF LOUISVILLE, KENTUCKY.
SAFETY CUT-OUT.
SPECIFICATION forming part of Letters Patent No. 472,084, dated April 5,1892. Application filed June 5, 1891- Serial No. 395,269. (No model) T0 at whom/it may concern.-
Be it known that 1, MANDEVILLE THUM, a citizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented certain new and useful Improvements in Apparatus for Insuring and Increasing the Safety of Electric Circuits or Conductors, of which the following is a specification.
The object of the improvement is to insure or enhance the safety of electric circuits or conductors, especially those which are used for electric lighting, railway, or power purposes. This I accomplish by guarding them in such manner that a signal is given or that a change in the circuitsuch as a break, a decrease of its conductive capacity, or the substitution for the whole or a part of it of other conducting devices--is automatically effected upon the occurrence of an accident such as the breaking of a conductor of the guarded circuit or the crossing of it by another conductoror upon the occurrence of other conditions which render such change desirable, but which may not come within the term accident.
To this end my invention consists in the combination, with a main circuit or circuit to be guarded, of a safety device comprising a branch circuit connected with said guarded circuit and an electro mechanical device of suitable character in a branch circuit and adapted to operate to change the guarded circuit upon a change of the currentin the latter.
My invention further consists in the parts and combinations thereof hereinafter particularly set forth and claimed.
In order to makemy invention more clearly understood, I have shown in the accompanying drawing means for carrying the same into effect without, however, limiting the improvement in its application to the particular construction which, for the sake of illustration, I
' have delineated.
an electric railway, a lighting-circuit, powercircuit, or other electric conductor. G is the generator or source of electric energy for said circuit.
S is a safety device comprising a branch circuit a, connected with the main conductor A, and having therein a thermo-electricalinstrument, galvanometer, electromagnet, or other electro-mechanical device. In the drawing the latter is shown as an electro-magnet at M, through the helix of which the circuit Cb passes. L is the armature-lever for said magnet, carrying or operating an electric contact P, adapted to engage or be separated from a contact P. These contacts are in and form the means of completing the circuit A. The branch circuit a is also provided with electric contacts 1) p, which are adapted to be operated by a second electro-mechanical device, such as a magnet M and armature-lever L, the latter carrying the contact 19 and the former having its helix in the circuit A. The parts are arranged so that the attractive force of the magnet M will maintain a separation of the contacts pp. If now a break occur in the line A, such separation will cease, the circuit a will be completed, and magnet M energized, and the circuit A will be positively and forcibly broken at PP by the operation of said magnet and its lever L. So much of the current from circuit A may be admitted to the circuit a as is desirable, a suitable resistance or resistances being employed.
What I claim is In a safety device for electric circuits, the combination, with the main circuit, of a branch circuit, an electro-mechanical device therein, electric contacts in the main circuit adapted to be operated by said electro mechanical device, contacts in the branch circuit, and an electro-mechanical device in the main circuit and adapted to control the latter contacts, substantially as set forth.
In testimony whereof I hereunto set my hand in the presence of two witnesses.
MANDEVILLE THUM.
Witnesses:
H. N. Low, WILLIAM L. ALLEN.
US472084D Safety cut-out Expired - Lifetime US472084A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461265A (en) * 1945-09-17 1949-02-08 Herbert H Gates Protected transformer circuit for high-voltage tubes
US2460860A (en) * 1945-10-25 1949-02-08 Volpigno Americo Electronic circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461265A (en) * 1945-09-17 1949-02-08 Herbert H Gates Protected transformer circuit for high-voltage tubes
US2460860A (en) * 1945-10-25 1949-02-08 Volpigno Americo Electronic circuit breaker

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