Патент USA US2114871код для вставки
April 19, 1938. J. A. CLINTON 2,114,871 ELECTRIC SWITCH Filed April 15, 1937 2 Sheets-Sheet 2 5 570557727 A7. 5/177: 027 .5 J. 7/ “y ?'?gh?turngy Patented Apr. 19, 1938 2,114,871 UNITED STATES PATENT OFFICE 2,114,871 ELECTRIC SWITCH Joseph A. Clinton, Rocky Hill, Conn, assignor to Colt’s Patent, Fire Arms Manufacturing Com pany, Hartford, Conn, a corporation of Con necticut Application April 15, 1937, Serial No. 137,091 4 Claims. The invention relates to electric switches, and more particularly to switches. which include cir cuit overload protecting means such as fuses. The principal object of the invention is to pro vide a switch construction including a casing therefor wherein there is provided a main cover which when closed prevents access to the switch circuit connectors but does permit access to cer tain other parts of the switch, and on which is mounted an auxiliary cover openable therewith and also independently thereof and which carries an electrical conductor adapted to electrically connect the switch contacts under certain condi tions. From the following speci?cation other objects and advantages of the invention will be apparent to those skilled in the art. In the accompanying drawings I have shown the embodiment of the invention which I now deem preferable, but it will be understood that the drawings are intended for illustrative pur poses only and are not to be construed as de?n ing or limiting the scope of the invention, the claims forming a part- of this specification being relied upon for that purpose. In the drawings: Fig. 1 is a front elevation of a switch embody ing the principles of the invention. Fig.2 is a view similar to Fig. l but showing the auxiliary cover in open position. Fig. 3 is a view similar to Fig. 1 but showing both covers in open position. Fig. 4 is a sectional view taken on the line 4—4 of Fig. 1 with certain parts broken away to more clearly show the construction. Fig. 5 is a sectional view taken on the line 5-5 of Fig. 1. In accordance with the invention a casing is provided which may be of any desired type and 40 in the drawings I have illustrated the casing as comprising a channel member I having re movable side walls 2. The channel and side walls may be provided with such “knockouts” as may be considered desirable. I now prefer the form ’ of casing illustrated because it may be incor porated in a troughing system such as shown in the patent to Sachs No. 1,758,981 issued May 20, 1930. In the casing I mount means for supporting 50 the several elements of the switch. An insulat ing block 3 constitutes such a supporting means and it is stationarily mounted by screws 4 on a 5 bracket 5 which is in turn secured in the casing. In the illustrated embodiment I have shown two identical switches and associated circuits but it (Cl. 200-114) should be understood that any number of switches could be provided and that they could be of iden tical or different constructions as desired. As my two switches are identical I will only describe one. On the block 3 are mounted line and load cir cuit connectors 6 and 1, respectively, which are preferably so mounted as to be readily accessible under certain conditions for connection purposes. On the block 3 I also mount at least one switch contact and provide means for electrically con 10 necting this contact with one of the circuit con nectors. I have shown two switch contacts 8 and 9 mounted on the block and each one is elec trically connected with a circuit connector. At least one of the contacts is so positioned that a 15 person would not ordinarily touch it and thereby receive a shock. In the preferred construction illustrated both of the contacts 8 and 9 are so positioned as to eifectively prevent accidental contact therewith. These contacts are prefer ably embedded in the block 3 in recesses l0 which 20 open into the surface ll of the block and form the apertures I2 therein, the contact 8 being se cured to the block by a screw 13. It should be noted that these contacts in the preferred con struction lie behind the plane of the surface I l, 25 and are not only positioned in recesses in the block but are also aligned with the apertures I2 in the surface II. I do‘not, however, wish to limit myself to either of these details, the same 30 being merely preferred rather than critical. A fused type of switch is shown, this being the form of switch to which the principles of my in vention are particularly applicable. In accord ance with the invention the fuse is preferably 35 interposed in the circuit connecting one of the switch contacts with the load circuit connector 1 and is so positioned as to be accessible for re placement. In the drawings I have shown a fuse receiving means M which is mounted on the block 40 3 to hold a fuse in such a position that it is ac cessiblc from the front of the casing for replace ment. A center fuse contact 15, which is screw threaded, is secured to an angular extension it on the contact 9 to thereby electrically connect 45 the two and to secure the contact 9 to the base. The threaded she-l1 contact [4 is connected to the load circuit connector 'I. In accordance with the invention an openable main cover having an aperture therein is pro 50 vided for closing the front of the casing. The cover is so related to the casing and block 3 that, when closed, access to the circuit connectors 6 and l is prevented but access to at least a portion of the block is permitted. The main cover IT is 55 2 2,114,871 hinged to the casing as indicated at l8 and in cludes an apertured portion 19. It is apparent from the drawings, note Figs. 2 and 4 in particu lar, that I have shown a construction for effec tively preventing access to the circuit connectors while permitting access to at least a portion of the block 3, and more particularly to at least that portion of the block on which a fuse is adapted to: be mounted so that the fuse may be replaced without opening the main cover. The main cover may be secured in closed posi tion in various Ways but I have shown a con struction which I now consider preferable. The block 3 has a. hole 29 formed therein in which is 15 secured a nut 2!. The main cover has a hole therethrough at 22 and a bolt 23 projecting through the hole for engaging the threads of the nut 2! constitutes a releasable means for secur ing the main cover in closed position. 20 may, of course, be omitted if desired. The bolt The casing is also provided with the apertured spring latch 24 which is adapted to project through a hole 25 in the cover when closed. I provide an auxiliary cover for closing the 25 aperture in the main cover, the auxiliary cover being mounted on the main cover so as to be movable to expose the aperture in the latter and also so as to be movable with the main cover. The movement of the auxiliary cover with re spect to the main cover may be of any desired type, but this will be dependent upon other de tails of construction. In the illustrated and now preferred form of the invention, an auxiliary cover 26 is hinged to the main cover at 21 and 35 includes an offset or domed portion 28. The auxiliary cover 26 is larger than the aperture in the main cover and, therefore, when closed serves to- not only cover the aperture but to also cover the main cover securing bolt 23. The main 40 cover is preferably o?set at 29 to permit the edges of the auxiliary‘ cover to lie flush with the outer surface of the main cover and may be apertured .as at 30 to receive a spring latch 31 on the aux iliary cover. It is apparent that the two covers I‘! 45 and 26 will move as a unit when the main cover is opened. A handle, such as shown at 32 may be provided on the auxiliary cover. The auxiliary cover has mounted thereon, and insulated therefrom, an electrical conductor which projects rearward therefrom. This con ductor is so positioned and dimensioned that it electrically connects the switch contacts in the casing when both the main and auxiliary covers are closed and is electrically disconnected from at least one of them when either the main or auxiliary cover is open. In the embodiment shown an electrical conductor 33 is secured to the auxiliary cover 26 by means of an insulating block 34 which is secured to the offset portion 60 28 of the cover. In the illustrated form, the switch contacts 8 and 9 are mounted in sepa ' rate recesses in the block 3 and the conductor 33 is accordingly provided with two legs 35 which are adapted to project through the apertures l2 in the surface I I of the block to electrically con nect the switch contacts. The ends of the switch contacts 8 and 9 and the legs 35 are preferably beveled to provide co— operating cam surfaces 36 and 31 for .assuring 70 the proper engagement of these members when the conductor legs 35 are being moved into en gagement with the switch contacts. In using my device, either or both of the covers may be sealed shut by padlocks, for example, se 75 cured to the latch 24 and rings 38, and the main cover may, if desired, be additionally fastened by the bolt 23. The particular fused switch shown is adapted for use with a three wire system and for this reason I have shown a solid neutral 39 mounted 5 on the block 3. The operation of the device illustrated will now be described, assuming ?rst that the switch is suitably mounted and properly connected in an electrical circuit. If the auxiliary cover is sealed 10 in closed position, the seal is ?rst removed. By means of the handle 32 the auxiliary cover 26 may now be moved to open position and while being so moved the conductor 33 is moved out of engagement with the switch contacts 8 and 9 15 to thereby electrically disconnect them. As the contacts 8 and 9 are positioned behind the sur face ll there is little or no danger of accidentally touching these contacts. Also with just the aux iliary cover open no access may be had to the g0 circuit connectors 6 and ‘I. The connector 1‘ is preferably connected to the load side of the cir cuit and consequently with the auxiliary cover open so as to expose the fuse for replacement the fuse contacts l4 and I5 are electrically dead. 25 The fuse may now be replaced without danger of shock to the person so replacing it. The auxiliary cover may now be closed, movement of the conductor 33 being simultaneously effected to electrically connect the switch contacts 8 and 30 9. If access to the circuit connectors 6 and ‘I is desired for any reason, the main cover may be opened after ?rst releasing the latch 24, or if a bolt 23 is used it must be removed; in either case, it is apparent that the switch contacts 8 and 9\‘ 35 will be electrically disconnected when the main,‘ cover is open to expose the circuit connectors. It is of course obvious that various changes in details of construction within the scope of the invention will be apparent to those skilled in the 40 art. What I claim is: ' i. The combination in a fused electric switch, of a casing, an insulating block stationarily mounted within the casing .and having a front 4,5 surface, an openable main cover for the casing having an opening therein, the edges of the open ing substantially ?tting the block and the cover thus cooperating with the block to entirely close the casing with only the front face of the block 50 exposed, line and load circuit connectors mount ed on the block behind the cover, two switch con tacts mounted on the block behind the front sur face thereof so as to be substantially protected thereby from being accidentally touched, one of 55 said contacts being electrically connected with in the casing with one circuit connector, fuse re ceiving contacts mounted on the block adjacent the front surface thereof so as to be accessible through the cover opening for fuse replacement, 60 the said fuse contacts being electrically con nected within the casing with said other switch contact and with the other circuit connector re spectively, an openable auxiliary cover mounted to be movable with the main cover and normally 65 serving to close the opening therein and to cover said exposed front surface of the block, and an electrical conducting member carried by the aux iliary cover and insulated therefrom and. being so formed and positioned as to engage and elec- 70 trically connect the switch contacts when the auxiliary cover is closed and to electrically dis connect said contacts when either the main or auxiliary cover is open. 2. The combination in a fused electric switch, 75 3 2,114,871 of a casing, an insulating block stationarily mounted within the casing and having a front surface with at least one relatively small aperture therein, an openable main cover for the casing having an opening therein, the edges of the open ing substantially ?tting the block and the cover thus cooperating with the block to entirely close the casing with only the front face of the block exposed, line and load circuit connectors mounted 10 on the block behind the cover, a switch contact mounted on the block behind the front surface thereof in alignment with said aperture therein so as to be substantially protected from being accidentally touched, said contact being electri 15 cally connected within the casing with the line circuit connector, a second switch contact mount ed on said block, fuse receiving contacts mounted on the block adjacent the front surface thereof so as to be accessible through the cover opening for fuse replacement, the said fuse contacts being electrically connected within the casing with said second switch contact and with the load circuit connector respectively, an openable auxiliary cover mounted to be movable with the main cover 25 and normally serving to close the opening therein and to cover said exposed front surface of the block, and an electrical conducting member car ried by the auxiliary cover and insulated there from and being so formed and positioned as to 80 engage and electrically connect the switch con tacts when the auxiliary cover is closed and to electrically disconnect said contacts when either the main or auxiliary cover is open. 3. In combination, a casing, an insulating block cuit connectors, said means including a fuse re ceiving device mounted on said block, an open able main cover for closing the front of the eas ing, said cover including an apertured portion so positioned with respect to- said block that when the cover is closed access through the front of the casing may be had to said fuse receiving de vice for fuse replacement but not to the circuit connectors, releasable means for securing the main cover in closed position, and an openable 10 auxiliary cover for closing the aperture in the main cover and for covering the main cover se curing means, said auxiliary cover including means by which it may be secured in closed posi tion against unauthorized opening. 15 4. In combination, a casing, an insulating block stationarily mounted within the casing, circuit connectors mounted on said block, at least one pair of switch contacts mounted on said block so as to be substantially protected from being ac~ 20 cidentally touched, a switching member movable to electrically connect and disconnect said pair of switch contacts, means for electrically con necting one switch contact with one of said cir cuit connectors, said means including a fuse re 25 ceiving device mounted on said block, an open able main cover for closing the front of the cas ing, said cover including an apertured portion so positioned with respect to said block that when the cover is closed access through the front of 30 the casing may be had to said fuse receiving de vice for fuse replacement but not to the circuit connectors, releasable means for securing the main cover in closed position, and an openable stationarily mounted within the casing, circuit auxiliary cover for closing the aperture in the 35 connectors mounted on said block, at least one pair of switch contacts mounted on said block so as to be substantially protected from being ac cidentally touched, a switching member movable main cover and for covering the main cover se~ 40 to electrically connect and disconnect said pair of switch contacts, means for electrically con necting one switch contact with one of said cir curing means, said means and auxiliary covers including cooperating means by which they may be secured together to prevent unauthorized rela 40 tive movement thereof. JOSEPH A. CLINTON.