US1398335A - Safety-fuse switch-box - Google Patents

Description

MNETED STATES PATENT @EFEQ.

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SAFETY-FUSE swrreH-nox.

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Original application filed April 13 1917, Serial No.

Specification of Letters Patent.

1918. I erlal No. 248,746.

To all whom it may concern: r

, Be it known that we, WALTER Harm RICH and CLAUDE L. MATTHEWS, citizens of the United States, residing at St. Louis, Missouri, have invented a certain newand useful Improvement in Safety Fuse Switch- Boxes, of which the following 1s a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompany ng drawings, forming part of this specificatlon.

This invention relates generally to electrical distribution apparatus and more particularly to the type of fuse sw1tch box disclosed in our copendin applicatlon filed April 13, 1917, Serial umber l 61,721, the present applicationbeing a dlvlslon of said copending application.

The principal objects of our invention are, to generally improve upon and slmplify the construction of the existing types of boxes or housings which form containers for safety fuse switches; to construct the box or housing so that the same is protected from injury consequent upon the blowlng of a fuse; to provide the box or housing wlth door which is self-closing through the force of gravity; to provide simple means for holding the door in open position while a fuse is being replaced or while repairs are being made to parts contained within the box or housin and further, to provide a simple form 0 latch for retaining the door in closed position against casual influences such as wind and the like and which latch will release the door in the event of an abnormal degree of pressure developed within the box or housing, or such pressure as is produced by the blowing of a fuse.

With the foregoing and other objects in view, our invention consists in certain novel features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompany- A ing: drawings, in whichigure 1 1s a vertical section taken through the center of a fuse switch box or housing of our improved construction, a corner of said box being in elevation. Fi 2 is an enlarged detail section showing t e door of the box or housing in open taken approximately on the line 33 of F ii. 1.

eferring by numerals to the accompany 1ng drawmgs which illustrate a practical embodiment of our invention, 10 designates the rear wall of the box, 11 the side walls thereof,- 12 the bottom and 13 the top. This box contains a fuse carrying member 14 of any desired construction, the same bein arranged between line terminals 15 an 16. The box is secured to a pole or other support by suitable hooks or retaining devices 17 the latter being preferably arranged on the rear wall 10.

The lower portions of the side walls 11 are wider than the upper portions. Consequently, the front edges of said side walls are inclined. The door 18 which forms the front wall of the box is formed at its upper end so as to swing on a horizontal axis, and said door tends to swing into closed position and retain such position under the influence of grav ty, and when closed, its side edges bear dlrectly against the inclined front edges of the side walls 11.

To normally hold the door in closed posit1on against casual influences, such as wind, we arrange on the lower front portion of one or both of the side walls 11, a detent member, preferably a relatively light fiat spring 19, the outer portion of which is provided with an aperture 20 and the extreme outer end of which is bent outwardly as designated by 21. Seated in the side edge of the lower portion of the door 18 is a pin 22, the projecting end of which is rounded or conical so that it will readily ride beneath the outer end of the detent and into. and out of the'aperture 20. This arrangement, in addition to normally holding the door in closed position, will ermit said door to swing 0 en in the event of the blowing of the fuse within the box or housing, for it will be understood that before the pressure within the box or housing, consequent upon the blowing of a fuse could rise to a point where it would burst the housing, said pressure would force in Fig. 1, the

which the door will resume its-closed position by gravity.

To hold the door in open position while the fuse carrying member is being removed or replaced, we rovide a spring detent member 23, one en of which is pivotally connected to a suitable bracket 24 on the door. This detent member 23 is provided with a slot 25 through which passes a pin or stud 26, the same being seated in the end of the side walls 11. The inner end of this detent is rebent to form a springfinger 27, the end of which bears against the inner face of said detent 23, and thus when the door is swung into open position, as. shown by dotted lines head of the stud 26 will ride into position beneath the spring finger as shown in Fig. 2, and thus the door will be yieldingly retained in open position.

By exerting inward pressure on the door after the fuse has been replaced, the door will be freed from the resistance offered by the spring finger 27 against the head of stud 26, and said door will swing to closed position by gravity.

A fuse box or housing of our improved construction is comparatively simple, and the door of the box or housing in addition to being provided with simple means for holding 1t in open position, is retained in closed position against casual influences, and at the same time, said retaining means is arranged to permit the door to swing open in the event of abnormal pressure developed within the box or housing, and which latter condition arises from the blowlng or burning out of yieldingly latching the same in a closed position, a slotted link pivotally connected to the door, a stud or projection on the box passing through the slot in said link, and a rebent portion on the end of said link for yieldingly engaging said stud or projection to hold said door in an open position.

2. A bracing link for doors provided with means at one end for pivotal connection to.

a support, a slot, and a rebent portion at its opposite end extending over a portion of said slot.

In testimony whereof we hereunto aflix our signatures this 3rd day of July, 1918.

' WALTER A. HEINRICH.

CLAUDE L. MATTHEWS.

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