US1733126A - Safety switch - Google Patents

Description

Oct. 29, 1929-. E. G. JOHgmssoN 1,733,126

SAFETY s wx r cu Original Filed A ril 2. 1926 2 SheetswShet 1 INVENTOR ATTORNEY Patented Oct. 29, 1929 UNITED STATES PATE NT OFFICE ERNEST G. JOHANSSON, OF WATERTOWN, MASSACHUSETTS, ASSIGNOR TO THE PALMER ELECTRIC & MANUFACTURING 00., OF WALTHAM, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS SAFETY SWITCH Original application filed April 2, 1926, Serial No. 99,391. Divided and this application filed. June 13,

1928. Serial My inventionrelates to safety switches for controlling electrio circuits and automatic cutouts associated therewith and has for its objectto provide a new and improved switch mechanism adapted for safety switches, whose switch arm when actuated so as to move to and from the cover of the casing, is more accurately guided and easily assembled. It further has for its object to provide a switch in which the switch arm is actuated in both directions by a pivoted bail and is easily assembled therewith and separated therefrom.

' The following is a description of an embodiment of my invention, reference being a had to the accompaying drawings, in which:

Figure 1 is a front elevation of a safety switch with the cover turned on its hinges so as to be removed from the body of the casing and expose the interior thereof;

Fig. 2 is a section of the internal switch mechanism on the line 22, Fig. 1, with the switch mechanism in closed position; and 4 V Fig. 3 is a sectional view of the same on the line 33, Fig. 1, with the parts in open position.

Referring more particularly to the draw-, ings, 2 is the body portion of the casing of the safety switch. 4 is the main cover hinged thereto at 6. 44 is the external handle of an interior'oscillating bail for actuating the internal switch mechanism, the same being pivotally mounted in the side wall of the case at 46. 48 is a stop guard for this handle. The internal switch mechanism actuated by the handle 44 consists'of a base of insulating material 78 secured to the rear wall of the body portion of the casing by screws 80. Secured to this base member is 'a metallic plate 82 carrying two parallel guide rods 84 on which is slidingly mounted a molded'switch arm block 86, carrying portions 87 rojecting' fromits body portion and closely tting the guide rods 84. These portions 87 may be intogral with the body portion 86 is desired. Mounted upon this switch arm block is an automatic cutout in the present instance, shown as a fuse 89, engaging terminals 88 and 90 of a fuse receptacle, which terminals are respectively connected to the end portions 92-and 94 of a switch arm whose parallel extremities are adapted to engage and disengage corresponding switch contacts 96 and 98 mounted upon the base 78. This switch block together with its switch arm and automatic cutout is reciprocated along the guide rods 84 by the bail 100 which is actuated by the handle 44. In order to removably connect the bail with the switch block I mount upon the lower portion of the switch block a metal hook 102 with which the transverse portion of the bail 100 is always in engagement when the parts are assembled. When, however, the screws 80 are removed so that the base 78 can be moved relatively to the casing a slight I movement upward of the base with the parts carried thereby will cause the hook 102 to disengage the bail 100. The main cover of the switch being open, the switch block can then be drawn ofi the guide rods 84 and the switch base with its other parts easily removed from the casing, thus providing a simple means for assembling and disassembling the interior switch mechanism from the casing and from the actuating member. Under normal conditions the bail prevents the removal of the switch block and limits its outward movement at a pointwhere its surface 86' is closely adjacent to the inner surface of the cover. as shown in Fig. 3.

In addition to the switch contacts the base 7 8'carries various other binding posts as indicated at 110, 111, 112 and 113, and a detachablelink 114 for the usual meter connecting and testing circuits, as is well understood by those skilled in the art.

This application is a division of my copending application, Serial No. 99,391, filed April 2, 1926. I

As will be evident-to those skilled in the art, my invention permits various modificacover, switch, contacts mounted upon said base member and insulated from one another, a switch arm block comprising a block of molded insulating material and carrying projections having openings fitting said rods and slidingly mounted thereon, a switch arm carried by said block and adapted to engage and disengage said switch contacts, a pivotally mounted bail for reciprocating said block upon said rods, said switch arm block having on its rear side a member having a laterally extending recess and engaging said bail.

2. In a switch, the combination of a casing having a cover, a base member removably mounted therein, a plurality of rods secured thereto and extending toward said cover, switch contacts mounted upon said base member and insulated from one another, a switch arm block comprising a body of molded insulating material slidingly mounted on said rods, a conducting member carried by said block and adapted to engage and disengage said switch contacts, a pivotally mounted bail for reciprocating said block upon said rods, said switch arm block having a laterally extending hook on its rear side adapted to be engaged with and disengaged from said bail by a relative movement when said base is detached from said casing, and said switch arm block being held on said rods by said bail and free to be drawn ofi said rods when said bail is disengaged from said hook.

3. In a switch, the combination of a base member, a plurality of rods extending outwardly therefrom, switch contacts mounted engage said switch contacts, a pivotally mounted bail for reciprocating said block upon said rods, said switch arm block having a laterally extending hook on its rear side adapted to be engaged with and disengaged from said bail by, a relative sidewise movement when said base is detached from said casing.

5. In a switch, the combinatiin of a casing having a cover, a base member removably mounted therein, a plurality of guide rods secured thereto and extending toward said cover, a switch arm block of insulating material slidingly mounted on said guide rods, an actuating bail mounted on the side walls ofsaid casing, said switch arm block having a hook on its rear side extending beneath said bail and adapted to be engaged with and disengaged from said bail by a relative sidewise movement when said base is detached from said casing.

In testimony whereof, I have signed my name to this specification this 25th day of May, 1928. v v

ERNEST G. JOHANSSON.

upon said base member and insulated from one another, a switch arm block comprising a body of molded insulating material and having vertical projections provided with openings fitting said rods and slidingly mounted thereon, a conducting switch arm carried by said block and adapted to engage and disengage said terminals, and a pivotally mounted bail for reciprocating said switch arm block and switch arm upon said rods, said switch arm block having a laterally extending hook on its rear side adapted to be engaged with and disengaged from said bail when said base is detached from said casing, I and said switch arm block being held on said rods by'said bail and free to be drawn ofi said rods when said bail is disengaged from said hook, said switch arm block having fuse terminals connected respectively to the end portions of said switch arm.

4.'In a switch, the combination of a casin having a cover, a base member removab y mounted therein, a plurality of rods secured thereto and extending toward said cover, switch contacts mounted upon said base member and insulated from one another, a switch arm block of molded insulating material having openings formed in said insulating material and fitting said rods and slidingly mounted thereon, a'switch arm carried by said block and adapted to engage and dis-

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