US1542606A - Electric fuse - Google Patents

Description

"25' construction 0f the other suitable means. f

PaiemedlJan 16, 1925.

- I JNITED STATES PATENToFFlcE.

, HENRY T. BUSSMAVNN, OF ST. LOUIS, MISSOURI.

ELECTRIC EUsE.

Application *med Kay 7,

" To all whom 'it may concern.'

Beit known that I, HENRY T. BUssMANN, a citizen of the United States, residing'at St. Louis, Missouri, have invented a certain new and useful Electric Fuse, of which the following is avull, clear, and. exact def` scri tion, such as will enable others skilled in t art to make and use the same.

My* invention relates to electric fuses and l. refers particularl to that type'known as the "refllable 'knife b ade cartri ge type; yetv I do not limit my invention to this type assu certain of m improvements are likewise de s'rralile i'n. ot er types of fuses.

u 'rte object. ofmyinvenepn is e mide afuse that can beY easily and quic y rescribed inthe specifications, I do not limitmy invention-to the form, shape or se shown, or to the several partsthereof, as various alterations can lbe made without changing. thescope of my invention.

. v1 isa-view 0f-my fuse, having@ sa:

roken out'cto show the tion ent thereof. Fig. 2 is a similar view, SO'degrees removedfromsthe 'tion shown in Fig. 1. Fig.v 3 showeep're erred form of my termi.

Anal holding" device.- Fig. '4 shows an alter- 8l nateconsruction. .p

Infthe drawings, 6 is other suitable material. 'which is Ypneferaby 10 or other means or removably holding the 40 ,cap 9. .This'meinber is'held 'by threads 8 or 'any other suitable means and 1s held rotation by It is preferably fitted inside the casing, -so that when .the fiber shrinks, it serve'stohold the member firmly, although it isobvious'that I may attach this rlpember outside the asy shown in ig. 4. Y

The fiat blade terminals l2 are removably 13 bybolts 14, or

a; casing, of fiber or 7 is a member,

y connected to the fuse link The innerpreriphery orf the member 7 y is so provided with threads A 191s. l serial No.' 295,372.

shaped as to hold the terminal 12 against rotational movement. While any non-circular interior of proper dimensions will so hold the terminal, I prefer to use grooves as shown at 15. One of these members being placed at each end off the casing, with the grooves properly positioned, the terminals stantial alignment with each other.

Tobhold the terminals against longitudinalv movement, Ipliovide a terminal holding device;- which consists preferably of two parts 16. These parts are .pressed against and firmly' .l 1old the terminalsli by reason `12 are held in the same plane and in subof. their tapered out/er periphery 1'? and thev tapered walls 18 of the cap 9. These parts l are seated. on 'the'member 7 and when 'held in position b the cap attached to the 'mem` b er, their -ho ding power cannot v be affected by any shrinkage in the length of the casing.

"Suchshrinkagewould, if the parts were vseated directly on the fiber casin permit them to become loose and release on the terminals.- It is obvious that these parts may' be reversed on the member and theinner periphery of the member, arranged eir hold to hold them, inwhich event the cap may be projecti'ons '19, so as to entirely surround the terminal and I make these parts of substan-v tial thickness, thereby providing bearing points 20, 20` and 21, 9.1V separated from each other and in constant spaced relation to Wise movement, if-

. 4Wise movement, I provide the parts Ywith each other. These projections 19 also serve j to entirely close the case.

To prevent the escape offlame or gases on the blowin of the fuse, I prefer to arrange that all o the openings in the assembled fuse have indirect angular paths, so that such flame or gas -must pass through such indirect paths -and is, therefore, substantially restricted from escaping from the fuse. For this reason I provide a portion of the terminal near the-end of the casing with an interrupted surface 22 extending completely around the terminal. I also provide such 1nterrupted surface on the projections 19 of the washers 16 where they abut each other and preferably also on that portion of the washers in contact with the terminals in which event such interrupted surface is made to coincide with the interrupted surface of the terminal.

Such interrupted surface may be grilled, corrugated, channeled, or made uneven 1n any mannerl that would provide a restricted enit for flame or gas.

It can be readily seen that this interrupted surface also serves to hold the terminal more rmly against longitudinal movement.

Due to the clearances necessary between the bolts le and the holes in the terminal and fuse link through which they tion in length of the assemble element oecurs. The shrinkage of fiber also causes variations in the length of the casing. To overcome these variations I make the interrupted surface on the terminal substantially wider than the thickness of the parts so that the parts` will always engage an interrupted surface notwithstanding limited variations in the relative length of the fusible element and casing. It is obvious that where these variations are prevented or where other means me employed for taking care of these variations, that this interrupted surfaceneed be approximately only as wide as the thickness of the parts.

What I claim is:

l. In an enclosed knife blade fuse, a casing, a flat blade terminal, a member permanently attached to the casing and adapted to prevent the rotation of the terminal and means seated on said member for wedging the terminal and holding it against longitudinal movement.

9.. In an enclosed knife blade fuse, a casing, a member permanently attached to the casing adapted to hold a flat blade terminal in a predetermined position against rotation, a fiat blade terminal extending within the casinga tapered holding device seated on said member for holding the terminal against longitudinal movement, and a cap removably fitted to said member for holding said tapered device tightly against said member. f

3. In an enclosed knife blade fuse, a casing, a terminal, a member permanently at tached to the casing, preventing rotational movement of the terminal, a tapered holding device seated on said member, a cap removably fitted tosaid member and means in the cap for causing the tapered holding device to press against the terminal to hold said terminal against longitudinal movement.

e. In an enclosed knife blade fuse, a casing, a terminal, a member permanently atpass, a varia,

tached to the casing, preventing rotation of thev terminal and a tapered device for restraining the longitudinal movement of the terminal and a cap adapted to bear on the tapered device. 5. In an enclosed knife blade fuse, a casing, a cap, a. terminal extending within the casing, a tapered terminal holding device, said device having bearing points substantially separated and in constant spaced relation to each other, Vwhereby the edgewise movement of the terminal'relative to the casing is substantially prevented, the holding device being wedged against the termi- .nal to prevent the longitudinal movement indirect exit for gas when the fuse is blown.

8. In an enclosed fuse, a. casing, a terminal having a portion thereof with an interrupted surface substantially about its periphery, a terminal holding device adapted tobe wedged against said portion of the terminal and providing an indirect exit for gas when the fuse is blown.

9. Inan enclosed fuse, a casing, a terminal, a tapered terminal holding device consisting of a plurality of parts surrounding thev terminal and havin interrupted surfaces on the abutting er ges of such parts, providing an indirect exit for gas when the fuse is blown.

10. In an enclosed fuse, a casing, a terminal, a tapered terminal holding device, surrounding the terminal, said terminal and device having interrupted surfaces abutting each other to provide an indirect exit for gas when the fuse is blown. r

l1. In an enclosed fuse, a casin a. terminal, a tapered terminal holding evice surrounding the terminal, said terminal having an interrupted surface of greater width than the thickness of the holding device.

12. In an enclosed fuse two members each having a substantially flat face adapted to be placed in abutting relation with the face of the other member; a portion of one of said faces being interrupted to provide indirect passageways between Said faces for the exit of gases on the blowing of the fuse.

13. In an enclosed fuse, a plurality of members in abutting relation, one of said members having a portion ofits abuttin surface knurled, to provide s. plurality o indirect channels between said abutting i members for the exit of gases produced on the blowing of the fuse.

14. In an enclosed fuse, a plurality of members in abutting relation one of said members having variations in a portion of its abutting surface whereby indirect passageways with a plurality of bales therein are provided between the abutting members,

to allow of the exit of gases therethrough on the blowing of the fuse.

15. In an enclosed fuse two members in abutting relation and means on the members for holding of vthem against relative displacement and providing a plurality of indirect passages between the members for the exit of gases on the blowing of the fuse.

HENRY T. BUSSMANN.

Images