US1381803A - Fuse-plug - Google Patents

Description

T. F. COTE.

FUSE PLUG.

Patented June 14, 1921.

Ind/8722 971 T 6 02 8.

the body which will tightly secureone end of the fuse member to a contact and which.

UNITED STATES:

PATENT. orrlcli.

'rnoims 1*. corn, or wmmrne, Manon; CANADA.

I FUSE-BLUG.

To allcbhom it may concem: V i I Be itrknownvthat'l, THOMAS Corn, a

subject of the King of Great Britain, resid-i sing at Winnipeg, in the-Province of Man1- toba and Dominion of Canada,: have in ventedycertain new anduseful Improvements in Fuse-Plugs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art .to which it a This invention relates, to new and useful improvements in fuse plugs of the type having-removable fuse members and has for one of itsobjects the provision of aclosure for will seal the body thereby preventing the escape'of flame from the body when the]- fuse member is blown out and also'retards' the escapeof gases created by the blowing out ofthe fuse member.

Another object of this invention is the provision of means for preventing theflames from melting or affecting the solder which secures one end of the fuse member to the central contact, thus reducing the quantity v 1 of gas-in the body when the fuse member is blown. .r p 1 A further object of thlSlIIVGIItIOD is the provision of means whereby the central contact may detachably secure one end of the fuse member in place in the body and which permits of said fuse member being removed in case of damage thereto. y

A still further object of this invention is the provision of a fuse plug of the above stated character, which shall be simple, durable and efficient, and which may be manufactured and sold at a comparatively low cost.

With these and other objects in view as will become more apparent as the description proceeds, the invention consists in certain novel features of construction, combination, and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing in which,

Figure 1 is a vertical sectional view of a fuse plug constructed in accordance with my invention,

Fig. 2 is a vertical sectional view of the 1 Specification "of Letters ratent. Applicationfiled May 28,1919. 'Serial no.

the central contact and held by said contact.

Patented June 14,1921.

central contact illustrating the means ofsecuring one'end of-the fuse member thereto,

Fig. 3 is a vertical sectional viewillustrating a modified form of my invention in which the fuse member is separate from within the body Fig. 4 is a: detail view illustrating the enlarged end of my modifiedform of fuse element.fl

Referring ;in detail to the drawing, the numeral 1 indicates as anentirety a fuse plug consisting of a body 2.having a'reduced screw threaded portion 3 on which is thread- ,edetmetal' ferrule 4*havin'g screw threads ,on its outerfface for coiiperation with the usual sc'rew-threadswithin an electric socket. The reduced extension 3 is closed by a disk 5 having an-openingfi to permit a fuse member 7 to extend upwardly within the, body.

The body 2 is constructed of any desired insulating material which is of a non-breakable nature. 1 The disk 5 is provided with a flange 10 that is engaged by aflange 11 formed upon the metal ferrule 4 for retaining the disk against the extension 3. A gage disk 12 is located within the opening 6 of the disk 5 and is provided with a slot of a given size to permit a fuse member of a given gage to be inserted within the body. It will therefore be seen that the slot in the gage disk 12 will prevent an oversize fuse member being placed within the body; q

A central contact plug 13 is provided with a cylindricalportion 14 that fits within the opening 6 in the disk 5 and has one end of the fuse member 7 soldered or otherwise secured therein. After the end of the fuse member 7 has been soldered to the plug 13, the cylindrical portion 14 is filled with plaster of Paris or similar material 15 to form an insulator for preventing the flame when the fuse member 7 blows out from melting or destroying the solder, thus reducing the amount of gases within the body when the fuse member is blown. The cylindrical portion 14 frictionally engages the wall of the opening 6 of the disk 5 so that one end of the fuse member 7 is firmly anchored within the body.

The reduced portion 3 of the body 2 is provided with an opening 16 to permit a contact member 17 to extend through said reduced portion 3 and be soldered or otherwise secured to the metal ferrule 4. The contact member 17 extends upwardly within the body 2 and within a groove 18 and has its upper end angularly related to form a clamp 19 under which is adapted to be po-' sitioned the free end of the fuse member-7.

A closure plug 20 is threaded into the en larged end of the body 2 for efficiently .seal-- ing said body "and also engages the clamping end 19 of the'conducting member 17 for forcing the same against the free end of the fusemember 7 It will be notedthat when the plug 20 is threaded against the plug and also the solder employed to setothe flame.

the plug 20 threading into the body 2 efiicure the'contact member 17 to the metal fer rule is entirely protected from-the flame caused by the blowing of the fuse 7, thus reducing the amount of aswithin the body,

would be created if the solder was exposed It will be further noted that ciently seals the body and prevents the flame from escaping from the body when the fuse member 17 is blown and which can be readily removed'from the body when it is desired to replace the fuse member 7 by another fuse member. {The plug 20 is provided with a slot 21 to receive a screw driver or like tool for threading the plug into and out of the body. I

Referring to my modified form of invention, one end of the fuse'member 7 is enlarged as illustrated at 22 and disposed to overlie one face of the gage dis'k12 and is held against the same by means of a screw threaded contact plug 24 threaded into the opening 6 of the disk 5, thus it will be seen that the fuse 7 can be readily detached from the body by removing the plug 24:.

. WVhile I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination, and arrangement said shoulder, a gage disk in said opening and having a portion thereof spaced from the wall of said opening to provide a fuse receiving slot, a fuse extending through the slot and into the body, meansconnecting the fuse to the ferrule, and a plugsecured in the openingand forcing one end of the. fuse against the gage disk. otherwise a consider-a le amount of gas 2.'A fuse plug includinga body having a ferrule, an insulating disk secured to the body by said ferrule-and having an opening, a gage disk located within the opening of the first named disk, a fuse member extending'between the gage disk andthe wall of the opening and having anenlarged end disposed against one face ofsaid gage disk, a contact plug threaded within the opening of the first named disk against the end of the fuse member, and meansconnecting the other end of the fuse member to theferrule.

In testimony whereof I afiix my signature in presence of a witness.

THOMAS F. corn.

Witness:

BENNETT S. J ONES.

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