US2581308A

US2581308A - Controlling and indicating device

Info

Publication number: US2581308A
Application number: US109317A
Authority: US
Inventors: Howard J Smith
Original assignee: Bell Telephone Laboratories Inc
Current assignee: AT&T Corp
Priority date: 1949-08-09
Filing date: 1949-08-09
Publication date: 1952-01-01
Anticipated expiration: 1969-01-01

Description

Jan. 1, 1952 H. J. SMITH CONTROLLING AND INDICATING DEVICE Filed Aug. 9, 1949 ALARM i 66 /N VE N TOR H. J. SM/TH Patented Jan. l, 1952 UNITED STATES PAT ENT CFFICEL CONTROLLING AND INDICATING DEVICE Application AugustS, 1949, Serial No. 109,317

Claims. l1

This invention relates to circuit controlling devices and more particularly to circuit protectors having associated indicators and alarm circuits.

One object of' this invention is to obtain a simple. cheap and compact circuit controlling device including a cut-out and an associated alarm actuating means which are readily accessible andV are fully insulated from an, operator when the elements are connected to the source of power.

In one circuit controller illustrative of' this inventionl a fusible element andan alarm circuit closing device operable upon the fusing of the element are mounted on the cover of a receptacle in such a manner that the cover must be removed inv order to obtain access to the elements of thel device. The device also serves as a switch, the main and alarm circuits being openedk by the removal of the receptacle cover.

This and other features of this` invention will bc understood more clearly from the following detailed description wheny read in conjunction with4 the accompanying drawings in which:

Fig. 1 is, an exploded perspective of a, circuit controller illustrative of this invention, a portion of the receptacle being broken away Fig. 2. is a sectioned elevation of a portion of the alarm details of the device in the unoperated condition.;

Fig. 3 is a sectional elevation of the details of Fig. 2 in the. operated condition with4 the. fusev broken; and

Fig.. 4.15 aA circuit diagram of the, controller of Fig. 1.

Referringr now to Fig. 1,V the circuit controller including a. receptacleor fuse block I0, whichmay be molded oi a single pieceA of insulating material, is arranged for panel mounting. Bolts I I, I2 and I3 extend through the bottoml of the, receptacle I9.

and provide terminals ior the load, battery and alarm circuits, respectively. Brake jaws I4, I5 and I6 are supported within the base ofA the re.- ceptacle Ill and secured therein by the bolts II, I2 and. I3 to provide electricalconnection to knife blades I8, IS and on the receptacle cover 22. 4!

The receptacle cover 22 forms a fuse holder for a conventional cartridge fuse 23 which is mounted in the

ferrulev clips

24 and 25 on the ends of the depending legsr26 and 21 which are molded integral with the molded cover 22.

Metal straps

29 and 30 extend from the knife blades I8 and I9 to the base of the

ferrule clips

24 and 25 so that on. mounting the cover with its face 3| ilush with the face- 32 of the receptacle, the blades enter the brake jaws I4 and I5 to complete a circuit as shown as shown in Fig. 4 from the battery 33 to terminal I2, brake jaw I5, blade I9, strap 30, clip 25, fuse 23, clip 24, strap 29, blade I8, brake jaw I4 and terminal I I to the load.

An auxiliary alarm circuit controlling device (c1. zoos-114.)

and; visual indicator in the form of a cartridge fuse 35 is mounted in a bore 34 in leg 26' on cover 22. The fuse 35 has its fusible element fixed" to. one ferrule 36' and electrically associated with the other ferrule 31 through a coil spring 38 which axially biasesa conductive cap 39 away from theY ferrule 31. A ferrule terminal in the lform of a, coil spring 4I) is mounted in the bottom of the. bore 34 and is electrically associated with the line ferrule clip 24 for the main fuse 23, asby the bolt 4I. The ferrule 31A at the opposite end of the fuse 35 is located in the removable cap 43` which, as shown in Figs. 2 and' 3, has a bayonet 44 as an integral portion ofi the ferrul'e clip 45". This bayonet serves the dual' functions of retaining the cap on the cover 22 against the ejecting force of the compression spring 40 and of' providing an electrical connection to the, slotted plate 48, the undersurfaces of which it engages. Plate 4G in turn is connected` to the battery 33 through. the strap 41 which is secured to the battery ferrule clip 25 for the fuse 23 thus placingfuses. 23 and 33 in parallel between battery 3'3 and thev line.

As set forth above,k fuse 35 is provided withl a metal cap 39 mounted on the spring 38 and arranged to move axially away from the ferrul 3 1 upon rupture of the fusible. element. The cap 43 has an axial bore 5i] through which the can 39 can move to engage the contact plate 5I molded therein. Integral with the contact plate 5I' is a.

bayonet 52 which functions4 as a fastener for the cap 43 and as a portion of a conductive path as,

in the case of bayonet 44. Thus upon rupture off fuse 35 and movement of cap 39 alongl bore 5U to contact plate 5I, a circuit is completed from battery to blade I9,r through strap 41 to ferrule clip 45, to ferrule 31, spring 38, cap 39, to contact plate 5I, bayonet 52 andl thence to the slottedplate 54 which receives and engages the bayonet 52 when the cap 43 is mounted and is connected to an alarm circuit through strap 55' and knife blade 20 secured to the cover, knife blade 20' in turn engaging the brake jaw lli connected to the alarm terminal i3"on the fuse block.`

Upon overload' or fault in the line,y main fuse 23 and parallel' fuse. 35 both rupture removing` the supply from the line and applying it to an alarm circuit represented in Fig. l by the lamp 3 3. Itis to be understood that lamp Ifiy is merely repre.- sentative and equivalent alarms may be used, for. example, an audible alarm, some other form of. visual alarm or a combination including an arrangement ior switching. an` auxiliary circuit into` use. In addition to the indication of trouble provided by thel energization of4 an alarm circuit, asA shown in Fig. 3, a visual indicator is provided by an extension 53 on the cap 39 which projects through aperture 51 in the end of cap 43 when so the fuse is blown, thereby indicating immediately to a. maintenance man which fuses on the panel board require replacing.

To replace the main fuse the cover is removed by grasping handle 58 and withdrawing the entire fuse carrier assembly 22 from the fuse block I0. Fuse 23 can then be removed and replaced Without the use of any tools. The carrier is remounted by inserting it into the block thereby reconnecting the fuse across the terminals I I and I2.

Alarm fuse 35 is easily replaced by turning the exposed portion of the cap 43 to release the

bayonets

44 and 52 from their

respective latching plates

46 and 54. The cap of the fuse can then be removed by withdrawing it from the bore 34. Since fuse 35 is held in clip 45 only by friction it can be readily withdrawn and replaced without tools. Cap 43 and fuse 35 are then inserted in the bore to mount them, the

bayonets

44 and 52 being coded in order that they engage the proper circuit connectors. The form of coding illustrated comprises forming bayonet blade 52 wider than-bayonet blade 44 and accommodating slot 59v for bayonet 52 in the cover plate wider than slot 6I) for bayonet E4.

4 The device provides maximum safety for personnel, its face being entirely insulated from the conductors and the fusible element being completely enclosed thereby eliminating dangers from accidental contact of energized conductors, arcs and 'splattered hot metal upon rupture of the fuses. Further, maintenance is possible with a Nminimum of danger since the removal of the cover with the resulting separation of knife blades I8, I9 and 20 from brake jaws Id, I5 and IG is necessary in order to obtain access to the main fuse. Also, since the clip 45 in cap 43 frictionally engages ferrule 37 and upon removal of the cap withdraws fuse 35 and disengages the ferrule 36 from the contact 40, no energized portions can be exposed and contact can only be made by the insertion of a conductor either into the bore 34 when the cover is mounted or into the receptacle when it is removed.

What is claimed is:

l. A circuit controlling device comprising a re ceptacle carrying contact members, closure means for said receptacle having a chamber therein, a main circuit fuse mounted on said closure means, an auxiliary circuit switching means operative upon the opening of said main circuit fuse` mounted within said chamber, and contact members on said closure means associated with said main fuse and said auxiliary ciri cuit switching means and electrically connected to saidreceptacle contact members only when said closure means is moved into the closed pcsition. v

2. A circuit controlling device comprising a receptacle, a pair of main circuit contacts and an auxiliary circuit contact within said receptacle, a complementary cover for said receptacle, a main circuit fuse carried on the inner side of said cover, a pair of contacts on said cover electrically associated with said main circuit fuse and engaging said main circuit contacts when said cover is mounted, a contact on said cover engaging said auxiliary circuit contact when said cover is mounted, and auxiliary circuit switching means electrically in parallel with said main cirm cuit fuse and operative upon the rupturing thereof to connect one of said main circuit contacts to said auxiliary circuit Contact.

3. A circuit controlling device comprising a receptacle, a, pair of main circuit contacts and an auxiliary contact within said receptacle, a cover for said receptacle having a chamber'.` therein extending from the exterior thereof, closure means for said chamber having an aperture therein, a main circuit fuse mounted on said cover, an

' auxiliary circuit switching means operative upon the opening of said main circuit fuse mounted within said chamber, an indicator associated with said auxiliary circuit switching means extending through said aperture when said means is operative, and contact members on said cover associated with said main fuse and said auxiliary circuit switching means and electrically connected to said receptacle contact members only when said cover is moved into its closed position.

4. A circuitv controlling device comprising a receptacle, a pair of main circuit contacts and an auxiliary contact within said receptacle,v acomplementary cover for said receptacle, a main circuit fuse carried on the inner side of said cover,l a'

pair of contacts on said cover electrically associated'with said fuse and engaging said main circuit contacts when said cover is mounted, a contact on said cover engaging said auxiliary circuit contact, a second fuse connected in parallel with said iirst fuse, a contact electrically associated with the energy source for said rst and second fuses and movable upon rupture of said second fuse, a stationary contact engageable by said movable contact and associated with said auxiliary circuit contact, and a member on said movable contact which projects from the face of said cover to provide visual indication of the rupture of said fuse.

5. A circuit controlling device comprising an insulating receptacle, a complementary insulating cover for said receptacle, a pair of inwardly projecting portions depending from said cover, one of said portions having a bore axial thereof and perpendicular to said cover, a first and vsecond fuse contact mounted on said projecting portions, a cartridge fuse mounted on said contacts,

a fuse contact in the end of the bore and electri-u cally associated with said first fuse contact, a spring biased fusible element removably mounted in said bore, a cap for said bore, a clip on` said cap resiliently engaging said fusible element and electrically associated with the second of .said

fuse contacts, a contact member on said fusible element axially movable thereof upon the rupture of said element, a second contact within said cap engageable by said movable contact, knife blades on said cover electrically associated with each of said fuse contacts and saidsecond cap contact;v and complementary knife bladeclips within said; receptacle connecting said first-mentioned fuse contacts to a main circuit and said second cap contact to an alarm circuit when said cover is' mounted.

HOWARD J SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Curry V Dec. 20,1949 l