US1280595A - Overload electric switch or cut-out. - Google Patents

Description

P. G VAN WUK.

OVERLOAD ELEm'mc swncn 0R CUT-OUT.

APPLICATION FILED NOV-11.1916.

Patented 0011.1,1918.

2 SHEETS-SHEET 2 fm'm.

ca Puma-Luna. WASNINGNN, DV 5 PETER GEBBTT VAN WIJ'K, OF GELDERMALSEN, NETHERLANDS.

OVEBLOAD ELECTRIC SWITCH OB, CUT-OUT.

Specification of Letters Patent.

Patented Oct. 1, 1918.

Application filed November 11, 1916. Serial No. 130,889.

To all whom it may concern Be it known that I, Pram Gmmrr VAN WIJK, subject of the Queen of the Netherlands, residin at Geldermalsen, Kingdom of the Nether ands, have invented new and useful Improvements in or relating to Overload Electric Switches or Cut-Outs; andI do hereby declare the following'to be a full, clear, and exact description of the same.

This invention relates to automatic overload electric switches. The object of this invention is to provide a switch in which it is possible to regulate simply the retardation latter magnet is connected to the former in series, in the second casein parallel. On being energized the magnet attracts a core or an armature which turns a spindle on which a second action is exercised in the opposite direction by a spring or balance weight.

The speed of rotation of the said spindle, and consequently the speed of movement of the core, can be regulated by alter-in the time of oscillation of an escapement w ich,

' on the said'spindle being rotated by the of the spindle being action of the core, is connected to the spindle by means of a coupling; this coupling doesnot however become operative in the event p the circumference of the disk, is brought 0 posite the releasing member of the switc rotatedo'n the opposite direction by the action of the balance weight The releasing member which is also controlled by a spring, is thus released and forced upward by the spring so that the switch is opened.

In the event of the overload discontinuing before the core of the time switch magnet has reached its outermost or end position, the said magnet is again short-circuited (or switched out) and the core or armature is returned to its original position by the spring or balance weight.

A construction in which the two magnets are connected in series, is illustrated in the accompanying drawing in which- Figure 1 is a front elevation,

Fig. 2 a longitudinal section on line AB of Fig. 1,

Fig. 3 a side elevation seen from the right in Fig. 1 and Fig. 4 a side elevation seen from the left.

The switch 1 controlled in the known manner by a weight or a spring, is locked in the closed position by a releasing member 2-which, in this position, projects in front of a cross bar 3 between the levers 4 of the switch. The upper end of the releasing member, provided with a roller 6, is forced by a helical spring 5 against the circumference of a disk 8 secured to a horizontal spindle 7. The spindle 7 is rotatably supported in two plates 9 and 10 of the frame or casing; on the spindle 7 is mounted a lever 11, the free end of which engages with a hook .14 of a spring-controlled pawl- 13 which prevents the lever 11 from being drawn back by a spring 15. When the pawl 13 is lifted in a manner hereinafter referred to, the lever 11, underthe action of the spring 15, will swing out, so that the spindle 7 will be rotated, and the disk 8 brought into such a position that a recess 16 of the same will be opposite the roller 6 at the upper end of the releasing member. pressed by the spring5 into the said recess 16. so that the switch 1 will be released.

' The drawing back of the spring-controlled pawl is brought about by the energizing of the electromagnet (time switch magnet) 17 which, on being connected up, attracts a core 18 adjustable in the central bore of the magnet, the said core beingsuspended by means of a. cord 19, chain or the like, to the circumference of 'a pulley 20 provided at its The latter will be,

circumference with a groove 21 for the cord 19. The pulley 20 is mounted on a horizontal spindle 22 supported inthe a side "plates 9 and 1O;- On the" same spindle is further mounted a ratchet wheel 23 of an escapement. The anchor24 ofthe escapementis mounted on a separate 'spiiidl'e 25 "on which" is also mounted a pendulum26 with an-ad-- justable weight 27. on the spindle 22 is further mountedia pinion 28 whichtransmits table on a pin 35, and in the normal position.

holds the lever 11 fast by means of the hook 14.

The dimensions are calculated so that approximately at the moment when the core 18 in its movement reaches the end position (attracted position) the spindle 22, and 'accordingly also the too'thed'wheel 29, will have been turned so far that the'spring-con trolled pawl13" willhave-b'een completely raised by the'link 32, and will releasexthe lever 11. The object of the slot 33 is toenable the toothed wheel 29 to be brought back to the original position after the-apparatus has become operative owing. to tli'e'maxirnum strength of current having been exceeded for a certain time; the pawl 13 can be raised only owing to the arrangement of the'slot 33 in the link 32. A balance weight 36 has the tendency to turn the spindle 22 inth'e direction opposite to that of the'core'18'. To thatend .it is suspended by a core 37 or the lilfe to a grooved pulley 38*andsecx'1red to, the spindle 22.. This balance weight 36' which couldalso be replaced'by a sprin has for its object to bring about the return of the core 18 to its normal position, in the event of theoverload failing to last so long that the core 18' reaches its end (attracted) position. As in that case the time switch magnet 17 is again out out, and accordingly deenergized, the core will be no longer attracted. The balance weight 36 will then rotate. the spindle 22 and raise the core 18 to the position which it originally occupied.

As during this turning back'of the spindle 22, the'ratchet wheel 23 of the device 'must not participate in the return movement, it is mounted on the spindle in a loosely rotatable manner, and T coupled to it only during the direction of rotation which is given to the spindle'by the attracted core 18. This coupling is effected by. a spring controlled locking pawl 39 providedon the ratchet wheel of the esc'apement and engaging with the teeth of a ratchet 'wheel 40 securedlto thespindle 22. When the spindle is turned back by the balance weight 36, thepawllfifi hand will glide loosely over the ratchet teeth, the ratchet wheel 23 of the escapement remainin stationary.

lie. .energiz'in'g of the magnet. 17 takes place .in. the following manner:

Intothe inainicircuitisswitched a magnet coil 41 which, on being energized has the tendency'to-attract' arcore or an armature 43 in opposition to the action of a spring 42. On-thecore 43 is provided a contact bridg 44 which short-circuits two contacts 45 and 46' as longasthe tension of the spring 42 remains greater than the force with which the core is attracted bythemagnet 41. The tensionoflthe spring 42 can-beregulatedhy means offla nut 47, for the purpose of altering the strengthof current at-which the core 43"opens the short-circuit between the contacts 45 and Y46. The core .43 is provided with a. stop pin 48 which, in the attracted position of the core, engages with fixed sto 49 andtis uidedin slots provided in t c said stops (Tigs. 1 and 4).

In the construction shown in thedrawing, one pole of an electric conductor a leading to the electric installation, is connected to the. terminal b; current passesthrough the magnet coil 41, terminal a, wired, contact 45, contact bridge 44, contact 46, wire 9, contact fork h and thence further onthrou the switch 1. In case of an overland, t e short circuit 45, 46, 44 is destroyed, and the current passes over the wire a, magnet coil 17, contact piece 46, then over 9 and h to the switch. The main current will pass accordin'gly. over the ma et 17, so thatthe core 18 will be attr and the spindle 22 rotated with a speed determined by the escapemen't device now coupled to the spindle In the event of the overload disappearing lowest position, that is to say, before the switch is released in the manner described; as theaction ofjthe weight 36 is greater than that exercised by the weight of the core 18, the former will prevail, and Will'turn the spindle22 with the parts connectedto it, back to the original position-H This return, movement does notjhowever depend on the escapement devicealone, as during the, turning back. 01 .1 pindle. 2

by the weight. 36; the. Qllpli lg. 39; 40 will not be operativ andthe movementwill not be transmitted to the escapementv device. The return to the position of, rest takes place-therefore with aconsiderableispeeflso thatithe. apparatus ,is automatically brought.

back. and i readyto. mkag iing Immediately after; eaChovetlOzid. I

, lE-gtitliev overload lasts longer thanthetime admis'slble forfthe punpose, thecut out will operate. In order to connect: the switch, a'gain,;the bar 2. is pulled down with: one

, fietthe crossbar 3 oitheswitchhas been moved into a position to engage behind it, while with the other the lever 11 is turned.

out of the type having a magnet and a core cooperating therewith, the combination of a spindle connected to said core so that when the core is attracted the spindle is rotated in one direction, means connected to said spindle for effecting rotation thereof in a reverse direction, an escapement, means for connecting said spindle and the escapement during movement of the spindle in one direction, a switch releasing member, and means operative by the travel of the core for releasing said member.

2. In an over-load electric switch or cutout of the type having a magnet and a core cooperative therewith, the combination of a spindle connected tosaid core so that when the core is attracted the spindle is rotated in one direction, means connected to said spindle for effecting rotation thereof in a reverse direction, an escapement, means for connecting the spindle and the escapement during movement of the spindle in one direction, a spring actuated member for releasing the switch, a notched disk for releasing said member, a spring-operated lever for turning said disk, and a pawl for retaining said lever, a link connected to said pawl, and a wheel revolved by the spindle and arranged to operate said link.

3. In an over-load electric switch or cutout of the type having a magnet to govern the mechanism of the switch, a magnet in the main circuit to govern the operation of the first magnet, and cores in the magnets, the combination of a spindle connected to one of said cores so that when the latter is attracted the spindle is rotated in one direction, means connected to said spindle for effecting rotation thereof in a reverse di rection, an escapement, means for connecting the spindle and the escapement during movement of the spindle in one direction, a member for releasing the switch, and means operated by the travel of the core connected to said spindle for releasing said member.

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

PIETER GERRIT VAN WIJK.

Witnesses:

THOMAS H. VERBAL, AL. BUNTA.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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