US1850672A

US1850672A - Fuse plug

Info

Publication number: US1850672A
Application number: US492702A
Authority: US
Inventors: Heller Alexander Gordon
Original assignee: INSULINE CORP
Current assignee: INSULINE CORP
Priority date: 1930-11-01
Filing date: 1930-11-01
Publication date: 1932-03-22
Anticipated expiration: 1949-03-22

Description

March 22, 1932. VHELLER FUSE PLUG Filed Nov. 1, 1950 2 Sheets-Sheet INVENTOR Alezmzder AT 556216; oRNEY I Mmh 22, 1932. A G HELLER 1,850,672

FUSE PLUG Filed Nov. 1, 1950 2 Sheets-Sheet 2 INVEZNTOR A fezmzder 0, 1762 [er Patented Mar. 22, 1932 UNITED STATES PATENT OFFICE ALEXANDER GORDON HELLER, OF HOWARD BEACH, NEW YORK, ASSIGNOR TO INSULINE CORP. OF AMERICA, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK FUSE PLUG Application filed November 1, 1930. Serial No. 492,702.

The objects of this invention are to rovide a device for fusing cord circuits or t e like, such as are usually plugged into baseboard receptacles and other wall outlets; to pro- 5 vide such a device in the form of a small inexpensive plug, which can be plugged into the standard wall receptacle and which in turn will take a standard form of attachment plug; which will disclose at all times the con- 1 dition of the fuses; which may be readily refused and which will be safe, dependable, practical and eflicient in every way.

The foregoing and other desirable ob ects are attained by the novel features of con- 15 struct-ion, combinations and relation of parts hereinafter disclosed.

The drawings accompanying and forming part of the specification illustrate a desirable commercial embodiment of the inven- 20 tion, but it is to be understood that the structure may be modified as regards this disclosure without departure from the true spirit and broad scope of the invention.

Fig. 1 is a perspective view illustrating the 25 adaptation of the inventionto a standard baseboard outlet; Fig. 2 is an enlarged broken perspective view showing the device separated for the replacement of a burnt fuse;

Fig. 3 is a view of the outer end of the deao vice; Fig. 4 is a view showing the device as it appears before the outer end cap is permanently fastened in place; Fig. 5 is a broken part longitudinal sectional view of the device; Fig. 6 is another sectional View as on substantially the plane of line 66 of Fig. 5; Fig. 7 is an end view of the plug part of the device as it appears when the glass shell and inner end cap are removed for replacement of fuses; Fig. 8 is a detail of one of the fuse links.

In Fig. 1, the numeral 9 designates an ordinary baseboard receptacle having sockets 10 for the projecting blades of a standard attachment plug.

The new fuse plug is equipped with blades 11 to enter the receptacle sockets 10 and make engagement with the contacts therein. These blades are shown in Fig. 5 as made with outwardly offset portions 12 engaged with angled shoulders 13 on the end of the plug body 14 and as having terminal extensions 15 projecting from the ofi'sets through passages 16 in the block into fuse recesses 17 in the sides of the block. Secured to said extensions by screws 18 are the fuse clamps 19 designed to grip the ends of the fuse links 20 against the sides of the extensions and proportioned to engage the shoulders 21 on the block to thereby secure the blade members against withdrawal from the block.. It will be seen that with this arrangement the blades or prongs of the plug are secured in place by simply fastening the fuse clamps thereto, said clamps preventing endwise motion in one direction by engagement with stop shoulders 21 of the plug and the oflt'sets 12 of the blades engaging shoulders 13 of the plug to prevent endwise movement of the blades in the opposite direction. Even when the clamp screws are loosened for the replacement of a fuse link, the blades will still be held in place. This offset construction of the blades furthermore is desirable as giving the projecting portions of the blades the proper spacing for cooperation with the receptacle contacts and as bringing the fuse terminal portions of the blade out to a larger diameter of the plug body where the fuse links can be more readily handled.

At the end opposite the projecting blades, the plug is provided with sockets 22 to receive projecting blades of a standard attachment plug and within these sockets are located the spring contacts 23 for engagement by such blades. Contacts 23 are shown as reversely bent spring members held in place in their sockets by cooperating clamp plates 24 bearing against shoulders 25 on the plug and secured by the screws 26.

The fuse links are thus removably gripped at their opposite ends in the clamps of the blade members and sockets contacts respectively. extending across the fuse channels or recesses 17 in the sides of the block between these points. Upon loosening

screws

18 and 26 the fuse links are released enabling portions of blown fuses to be readily removed and new fuses to be inserted and clamped in place.

The fuse carrying portion of the block or 100 plug body is shown as surrounded'by a glass case or cover 27 removably held in place between end flanges or rings 28 clamped over the opposite ends of. the block by the end lates 29 and 30, a through screw or similar astening 31 being rovided for holding said partsfiin the assem led relation indicated in 1 To further aid in holding and positioning the arts,

discs

32, 33, are shown dispose insi e the end caps, immediately overlying the ends of the plug body but caught beneath the end flanges 28 and bearing on the ends of the lass enclosure. Also these discs and the en caps are indicated in Figs. 5 and 6 as having registering openings or

recesses

34, 35, receiving

positioning lugs

36, 37, on the ends of the

fuse clamp plates

19 and 24. These end members are thus interlocked with the metallic portions of the pulg and as the latter interlock in seats or recesses in the plug, the parts are definitely positioned and held against rotational shifting.

Upon releasing the single screw 31, the plug may be opened up for the replacement of fuses. To prevent the parts from becoming entirely disassociated when the assembly screw 1s released there is shown in Fig. 6 a s ecial nut 38 for the screw, embedded in the b ock and having an annular collar or flange- 39 extended through the end cap 29 and riveted thereover at 40. This s ecial nut is located'at the end of the bore 41 or the screw and by the rivet construction described serves to secure the block and one end cap structure permanently assembled. Therefore, when the screw is released as in Fi 2, the transparent cover shall and one en cap will come away from the plug body and the opposite end cap, these thereby constituting but two main parts, which can be easily handled as such in renewing the fuses. The through screw may be arranged as shown, that is with its head at the inner end of the plug, so that when the plug is in service, th1s screw can not be reached to separate the parts of the plug. This makes it necessary to remove the plug from the receptacle or other electric circuit source before it can be taken apart. While in service however, the plug may be inspected 1at any time to see whether the fuses are inact. The prong contacts and the socket contacts are shown as disposed in the plug body on lines at right angles to each other, so that as indicated in Fig. 5, the socket contacts will be disposed in between the prong contacts. This side-'by-side relation of the contacts en ables a particularly small and compact structure, since the plug body need only be the length of one set of contacts. This arrangement also enables making the fuses in the form of relatively short links or straps extending circumferentially about the opposite sides of the plug body. The prong contacts 11, the socket contacts 23 and the

clamp members

19 and 24 may be of duplicate construction, which further cheapens the cost ofthe article and facilitates assemblage of the plug or replacement of the plug parts.

What is claimed is: 1. A fuse plug, comprising a plug body,

attachment plug blades projecting from one,

end of said plug body, attachment plug blade socket contacts in the opposite end of said plug body, fuse link connections circum erentially disposed about said plug body and connecting the blade and socket contacts and a readily removable transparent casing about the plug body and covering said fuse link connections.

2. A fuse plu comprising a plug body,

attachment plug ades projecting from one end of said plug body, attachment plug blade socket contacts in the opposite end of said plug body, fuse link connections circumferentially disposed about said plug body and connecting the blade and socket contacts, a readily removable transparent casing about the plug body and covering said fuse link connections, said blade and socket contacts having fuse link clamps disposed at the sides of the plug body for releasably gripping the fuse link connections.

3. A fuse plug, comprising a plug body, attachment plug blades projecting from one end of said plug bod attachment plug blade socket contacts in t e opposite end of said plug bod fuse link connections circumfer- 1-00.

entially isposed about said lug body and connecting the blade and sec et contacts, a

readily removable transparent casing about the plug body and covering said fuse-link connections and said plug body having shouldered portions cooperating with said clamps for positionin the blades and socketcontacts in the plug bo y.

4. A fuse plug, comprising a plug body, attachment plug blades projecting from one end of said plug body, attachment plug blade socket contacts in the opposite endof-said plug body, fuse 'link connections between the body, a transparent enclosure removabl disposed between said end cap structures, lade' contacts set in one end of the plu body, socket contacts set in the opposite en of the body, fuse clamps associating with said contacts, the blade and socket contact fuse clamps bemg alternately disposed about the periphery of the plug body, fuse connections between the fuse clamps viewable through said enclosure and fastening means for securing said parts together and readily releasable to enable the replacement of the fuse connections. i

6. A fuse plug, comprising a plug body, blade contacts seated in one end of the plug body and having fuse clamps disposed at the sides of the plug body, socket contacts set 1n the opposite end of the plug body and having fuse clamps exposed at the side of the plug body, the blade contact and socket contact, fuse clamps being alternately disposed about the periphery of the plug body and fuse links extending about the side of the plug body between the fuse clamps aforesaid.

7. A fuse plug, comprising a plug body, blade contacts seated in one end of the plug body and having fuse clamps disposed at the sides of the plug body, socket contacts set in the opposite end of the plug body and having fuse clamps exposed at the side of the plug body alongside the fuse clamps of the plug contacts, fuse links extending about the side of the plug body between the fuse clamps aforesaid'a-nd a cover removably engaged on the plug body and having a transparent portion for exposing the fuse links.

8. A fuse plug, comprising a plug body having openings extended therein from opposite ends of the plug body and shouldered fuse seats in the sides of the plug body, blade contacts and socket contacts set in said openings in the opposite ends of the plug body,

clamp plates secured to said contacts and engaged with the shoulders aforesaid. connections held by said clamp plates and located in the fuse seats in the sides of the plug body, a fuse cover about the plug body and end members holding said cover to the plug body.

9. A fuse plug, comprising a plug body having openings extended therein from opposite ends of the plug body and shouldered fuse seats in the sides of the plug body, blade contacts and socket contacts set in said openings in the opposite ends of the plug body, clamp plates secured to said contacts and engaged with the shoulders aforesaid, connections held ,by said clamp plates and located in the fuse seats in the sides of the plug body, a fuse cover said cover to the plug body, one of said end members being attached to the plug body and tltij other plug member being readily remova e.

10. A fuse plug, comprising a plug body having openings extended therein from opposite ends of the plug body and shouldered fuse seats in the sides of the plug body, blade contacts and socket contacts set in said openings in the opposite ends of the plug body, clamp plates secured to said contacts and engaged with the shoulders aforesaid, connections held by said clamp plates and located in about the plug body and end members holding the plug for detachably securing the parts in assembled relation.

In testimony whereof I alfix nliy signature. ALEXAN ER GORDON ELLER.