Патент USA US2412119код для вставки
I Dec. 3, 1946. 2,412,119 R. H. BENTLEY QUICK-ACTING SWITCH MECHANISM Filed Nov. 9, 1943 [1/4 \\ Z\I/ \/ V/A ?veniar ROBERT H. BENTLEY 6y his attorney-s ' v Patented Dec. 3, 1946 N-ITED s'raras 2,412,119 QUICK-ACTING SWITCH MECHANHSM Robert H. Bentley, Hartiord, @onn, assignor to The Arrow-Hart & Hegeman Electric (3cm pany, Hartford, Coma, a corporation of 6on necticut Application November 9, 1943, Serial No. biitttii?i 4 i’llaims. (Cl. 200-76) . a 1 This invention relates to snap action electric switch mechanisms. ‘ More particularly, it relates to a mechanism suitable for multi-pole electric switches wherein it is desired to break simu1~ taneously each of the multiple lines controlled by the switch. . It is an object of my invention to provide an improved electric switch mechanism particu= larly adapted for use in multi-pole electric switches of low alternating current ratings. Another object of the invention is to provide an improved switch mechanism which will cause simultaneous break in all the lines controlled by the switch and which may be economically con structed and-assembled. Another object of the invention is to provide an economical structure for an electric switch of small size for use in multi-circuit arrange ments, in which the breaks in all of the lines shall occur simultaneously and which will have a substantial interrupting capacity in compari son to its small size. ' Other objects and advantages of my invention will become apparent as it is described in corn is normally spring-pressed upwardly into engage ment with the fixed contacts by coiled compres sion spring at between the bridging contact and the bottom of the cavity. In order to insulate the bridging contact from the mechanism ‘for operating it to open circuit position, an insulating plunger member at, pref erably made of molded insulating material, rests upon the top surface of each bridging contact and is guided in its movement by channels formed in the side walls oi’ the base and of the partitions l3 and is. Because the several sets of fixed and movable contacts are individual units and ordinarily would not be dependent on one another for movement in unison, it has been found needful to provide actuating mechanism for causing simultaneous opening and closing movement of the contacts in order to avoid excessive arcing between the contact surfaces. To accomplish this object, I have provided a frame or contact~ moving member made up of three similar parallel stamped sheet metal ribs 5b, and each having laterally-directed arms 56a, 52a, blia at nection with the accompanying drawing. 25 their ends. These arms are each provided with In the drawinga pair of small neighboring apertures through Fig. 1 is a longitudinal section view through which pass parallel pins 5t, 58, which are, or may the center of an electric switch mechanism em be, soldered or otherwise amxed to the arms of the ribs 58, 52, 54% to form a rigid unit. Between Fig. 2 is a section view similar to Fig. 1, but 30 the neighboring pins 55, 58 the ends of a leaf spring member 6b are inserted.’ This member with parts in closed-circuit position; 60 may be stamped from thin resilient sheet metal Fig. 3 is a transverse section view, the section being taken along line 3-3 of Fig. 2; in the form indicated best in Fig. 6. To ac Figs. 4, 5 and 6 show, in exploded perspective, commodate the arms 50a, 52a, 54a, slots 62 may certain parts of the mechanism for operating 35 be cut into the end edges of the leaf spring mem her. It may thus be observed that the leaf the movable contact. Referring to the drawing, the switch contacts spring and the frame or contact-moving member bodying the invention; . ' and terminals are mounted within a rectangular molded insulating base 10 hollowed out for the , I form a contact operating unit. In order that an over-center action may be reception of three identical sets of contacts 40 produced, the leaf spring member 60 has an H-shaped slot 64 stamped in its central portion located in parallel chambers l2, l4, 16, which are separated by longitudinally extending parti providing two short arms 88 whose ends engage tions- I3 and I 5 formed integral with the base. in a circumferential groove formed near the end Each of the contact sets comprises a pair of of an actuator in the form of an operating pin ?xed stamped bar contacts 20, 22 secured upon 45 or plunger member 10. _ To bow the arms 66 and ledges 24, 25 at opposite ends of the base by give the leaf spring a bias, the diameter or thick ness of the portion or the plunger 10 engaged hollow internally-threaded rivets 28 which pro by the arms 68 is greater than the distance be~ ject through the bottom of the base to receive tween the ends of the arms 66 in their normal terminal screws 30. Each of the ?xed contacts ' 20, 22 extends into a cavity such as He in the 50 ?at aligned state. central part of each of compartments l2, l4 and At the central portions. of the ribs 50, 52 and M, cylindrical studs 50s, 52s, 54s are a?lxed. I6, and has a conventional highly-conductive The studs 50s and 54s extend laterally inwardly button-like contact tip facing downwardly into from one side of the ribs 50 and 54, and the stud the cavity for engagement with similar contact ‘ tips on a movable bridging contact bar 38 which 56 I23 extends from both sides 01’ the rib 52. These 2,412,119 - 4 3 studs are aligned and are adapted to seat with in the insulating plungers 42 so that upon move ment of the frame, the plungers will be caused to simultaneously move downwardly to cause the bridging contacts to disengage the ?xed con tacts simultaneously. ‘ To guide rectilinearymovement of the plunger Ill, a diametrical slot 12 is cut into the inner end of the plunger to receive short guide pins 14 radially extending inward from the walls of a central aperture ‘I6 formed in a‘ rectangular cover member 18 for the base I0. The cover member ' I moving member acting upon said bridging con tacts to move them simultaneously, a'leaf spring member having an H-shaped aperture providing resilient portions for providing a bias of said spring member into one or another of two condi tions, said leaf spring member engaging at its ends with said contact-moving member, and an operating pin engaged by said resilient portions for changing the direction of bias of said leaf spring‘ member. 2. In an electric switch, a casing, a plurality of ?xed and movable contacts therein, a'contact moving member acting upon, said movable con tacts to move them simultaneously, a leaf spring ing material and‘hollowed out on its inner sur face. for the reception of- the operating mecnas 15 member cooperating at its’ends with said con tact-moving member and having positions of op nism. . posite bias for locating said contact-moving Normally urging the plunger outward of the cover 18 is a compression spring 82 coiled around _‘ member in spaced positions, means in the bottom of said casing supporting said contact-moving the'plunger. One end of this spring 82 presses member during change of bias in.one direction. against the under side of a ?ange ‘H formed on means in the top of said casing supporting said the upper and outer end of the plunger 10; the contact-moving member during'change of bias opposite end of the spring presses upon the in the other direction, and a manually operable floor of a circular recess 84 in the cover concen tric with the plunger-receiving recess ‘I6. The actuator for changing said bias. I recess 84 preferably will be the same diameter 3. In an electric switch, a casing, a plurality as the inner ?anged end of I an insulating button ' of ?xed and movable contacts therein, said mov 80 that covers and insulates the outer end of able contacts being independently movable, a the plunger ‘it. The ?anged end of the button contact-moving member acting upon said mov Bll may be secured in the recess 84 by a stamped able contacts to move them simultaneously, a sheet metal bridge member 86; and the bridge 30 leaf spring member cooperating at its ends with member 86 may be secured to the cover by ' said contact-moving member and having posi through-bolts (not shown) which may, if desired, tions of opposite bias for locating said contact also serve the additional purpose of holding the moving member in spaced positions, means in the cover and base together. bottom of said casing supporting said contact In operation, depression of the button 80 and _moving member during change of bias in one, plunger ‘It overcomes the spring 82, bending the‘ direction, means in the top of said casing sup leaf spring arms 66 through the plane of the porting said contact-moving member during leaf spring member 50 from the position of Fig. change of bias in the other direction, and an 1 to that of Fig. 2. This change of state of the actuator manually operable in one direction to leaf spring carries the frame ribs 50, 52, 663 up-I 40 change said bias, and spring means operating wardly, allowing the contact biasing springs 659 said actuator to change said bias in the other to move the bridging contacts 38 into engage direction. _ ‘ ment with the stationary contacts 22, 2Q. 4. In an electric switch, a casing, aplurality ' Release of the button 80 will permit the re-' of ?xed and movable contacts therein, said mov turn spring 82 to reverse the condition of spring able contacts being independently movable, a arm 66, forcing the frame down and overcoming contact operating unit comprising a contact the lesser force of contact springs 50 to move the moving member acting upon said movable con vbridging contacts to open position. ta'cts to move them simultaneously and a leaf 18 may‘conveniently be made of molded insulat Many modi?cations within the scope of the spring member engaging at opposite end portions invention will occur to those skilled in the art. Therefore I do not limit the invention to the em with said contact-moving membenan actuator engaged by stressed portions of said leaf spring member to provide bias in opposite directions for bodiment disclosed. I claim: , 1. In an electric switch, a plurality of inde ' pendent sets of ?xed and movable contacts each comprising a pair of ?xed contacts and a bridg ing contact, spring means biasing said bridging contact into closed circuit position, in combina tion with actuating means comprising a contact locating said unit in different positions, means in the bottom of said casing supporting said contact-moving member during change of bias in one direction, and means in the top of said casing supporting said contact-moving member during change of bias in the other direction. ROBERT H. BENTLEY. _'