US504938A

US504938A - prentice

Info

Publication number: US504938A
Authority: US
Publication date: 1893-09-12
Anticipated expiration: 1910-09-12

Description

n5 Med al.) I '4 dams-Sheet 1.

H. N. PRENTIGE.

' ELEGTRIG OUT-OUT. No. 604,938 Patented Sept. 12, 1893.

6N0 Model.) 2 Sheets-Sheet 2.

11.. N. PRENTICE. ELECTRIC GUT-OUT.

No. 504,938. Patented se tjlz, 1893;

UNITED STATES PATENT OFFICE.

HERBERT NAPIER PRENTICE, OF STOWVMARKET, ENGLAND.

ELECTRIC CUT-OUT.

SPECIFICATION forming part of Letters Patent No. 504,938, dated September 12, 1893.

Application filed May 31, 1893. Serial No. 476,092- (No model.) Patented in England April 12, 1889, No. 6,284.

To all whom, it may concern.-

Be it known that I, HERBERT NAPIER TEEN- TICE, electrician, a subject of the Queen of Great Britain and Ireland, residing at Stowmarket, in the county of Suffolk, England, have invented certain Improvements in Electric Out-Outs, (for which I have obtained a patent in Great Britain, No. 6,284, dated April 12, 1889,) of which the following is a specification.

The object of my invention is to provide a cut-out for electric circuits which is simple in construction and very efficient and certain in action. I

The invention relates to the class of cutouts which are operated or caused to operate by variation in magnetic attraction due to an abnormal condition of the current in the circuit to be controlled.

According to my invention I cause the armature which is attracted or relieved from the attraction by the magnetic coil or core (wound with wire included in or taken as a shunt from the circuit to be governed) to actuate a tumbler or kicker so that the said tumbler or kicker being overbalanced or released falls and acts on the bridge or contact makers to quickly and with certainty remove it or them from the mercury cups or contacts. The kicker or tumbler or some part operated when the circuit is broken I prefer to arrange as an annunciator to clearly indicate to the attendant that the breaking of the circuit has taken place.

In order that mysaid invention may be fully understood I shall now proceed to describe the best means with which I am acquainted for carrying it into efiect and for that purpose shall refer to the annexed drawings.

Figure 1 is a side view and Fig. 2 is a front view of a cut-out constructed or arranged according to my invention showing the parts in the positions they occupy when the circuit is complete. Fig. 3 is a side view showing the parts in the position which they assume when the circuit is broken. The arrangement here shown is one in which the circuit is broken when the current exceeds a predetermined limit. A is the core of the electro magnet wound with wire included in or taken as a shunt from the circuit to be controlled 1) b being the sockets or binding screws by which the external wires are secured. The said sockets or screws are on conducting pieces B B the piece B being electrically connected to the conducting piece B carrying the mercury cup 0 and the piece B being in electrical connection through the coil of the electro magnet with the conducting piece B carrying the mercury cup 0. Into the cups 0 C- dip the ends d of the bridge piece D provided with arms d centered by the pin 6 to the bracket f. On this pin 6 are also centered the arms 9 carrying the armature g the said arms being connected by the cross piece g extending behind the lever 11 also centered on the pin e and having acounter balance weight at h and a tail piece k constituting a kicker. I is a screw in the bracket iby means of which the position of the armature g relatively to the end of the magnet core Acan be adjusted. The parts are mounted on a support or base X of insulating material. When the current is in the proper normal condition the parts remain in the position shown in Figs. 1 and 2 but on the current increasing to such an abnormal extent as to cause the electro magnet to attract the armature g the cross piece g moves the lever H into such a position that its weighted head h causes it to suddenly fall over so that its tail end h kicks the bridge and knocks it over into the position shown in Fig. 3 quickly removing the contacts (1 from out of the mercury cups and breaking the circuit. The inner part a: of the lever H may be colored red or otherwise colored or marked so as to act as a readily observable annunciator of the breaking of the circuit.

Figs. 4. 5. and 6 are views corresponding to Figs. 1. 2 and 3 showing the arrangement when the apparatus is to be used to break the circuit when the circuit falls below a predetermined limit. In these figures the parts which correspond with those shown in Figs. 1. 2 and 3 are marked. with the same letters of reference. The armature in this case is held in the position in which the circuit is completed by the core attracting the armature. WVhen the current lessens to a point at which the attractive power of the core is iusutticient to maintain the armature in position it falls over and the parts operate as hereinbefore described.

When the apparatus is used for continuous ICO currents I prefer to use a core to the magnet as shown but when the apparatus is used for alternating currents I prefer to dispense with the core or to use a core made up of insulated iron wires or plates.

1. In a magnetic cut-out, the combination with the magnet the armature and the contact pieces, of a pivoted arm having a Weight on one end normally opposing the action of the magnet and initially moved by the armatnre when the current becomes abnormal, and having the other end arranged to kick the contact pieces as the Weight falls, whereby the contact is broken, substantially as described.

2. In a magnetic cut-out, the combination with the magnet, the armature and the contact pieces, of a pivoted arm having a weight 20 on one end normally opposing the action of the magnet and initially moved by the armature when the current becomes abnormal,

and having the other end arranged to kick the contact pieces as the weight falls, with an adjusting screw adapted to regulate the distance between the armature and the magnet, substantially as described.

3. In a magnetic cut-out, the combination with the magnet and contacts, of a slotted armature, a weighted arm having a tail piece for removing the contact piece, the said weighted arm journaled on the same axis with the armature, and within the slot thereof, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

H. NAPIER PRENTIGE.

W'itnesses:

S. CZANSAR, RUDOLPH CHAS. NIoKoL, Clerks to Messrs. John Newton ct" Sons, Pub- Zt'c Notaries, N0. 31 Lombard Street, London, E. O.